[PATCH 1/7] diff: export diffstat interface

[PATCH 1/7] diff: export diffstat interface

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 diff.c | 36 ++++++++++++++----------------------
 diff.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/diff.c b/diff.c
index dc9965e836..46a7d8cf29 100644
--- a/diff.c
+++ b/diff.c
@@ -2421,22 +2421,6 @@ static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 	}
 }
 
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
 					  const char *name_a,
 					  const char *name_b)
@@ -5922,12 +5906,7 @@ void diff_flush(struct diff_options *options)
 	    dirstat_by_line) {
 		struct diffstat_t diffstat;
 
-		memset(&diffstat, 0, sizeof(struct diffstat_t));
-		for (i = 0; i < q->nr; i++) {
-			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p))
-				diff_flush_stat(p, options, &diffstat);
-		}
+		compute_diffstat(options, &diffstat);
 		if (output_format & DIFF_FORMAT_NUMSTAT)
 			show_numstat(&diffstat, options);
 		if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -6227,6 +6206,19 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 	return ignored;
 }
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
+{
+	int i;
+	struct diff_queue_struct *q = &diff_queued_diff;
+
+	memset(diffstat, 0, sizeof(struct diffstat_t));
+	for (i = 0; i < q->nr; i++) {
+		struct diff_filepair *p = q->queue[i];
+		if (check_pair_status(p))
+			diff_flush_stat(p, options, diffstat);
+	}
+}
+
 void diff_addremove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const struct object_id *oid,
diff --git a/diff.h b/diff.h
index ce5e8a8183..7809db3039 100644
--- a/diff.h
+++ b/diff.h
@@ -239,6 +239,22 @@ void diff_emit_submodule_error(struct diff_options *o, const char *err);
 void diff_emit_submodule_pipethrough(struct diff_options *o,
 				     const char *line, int len);
 
+struct diffstat_t {
+	int nr;
+	int alloc;
+	struct diffstat_file {
+		char *from_name;
+		char *name;
+		char *print_name;
+		const char *comments;
+		unsigned is_unmerged:1;
+		unsigned is_binary:1;
+		unsigned is_renamed:1;
+		unsigned is_interesting:1;
+		uintmax_t added, deleted;
+	} **files;
+};
+
 enum color_diff {
 	DIFF_RESET = 0,
 	DIFF_CONTEXT = 1,
@@ -327,6 +343,8 @@ void diff_change(struct diff_options *,
 
 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat);
+
 #define DIFF_SETUP_REVERSE      	1
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-- 
gitgitgadget

[PATCH 2/7] add--helper: create builtin helper for interactive add

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Create a builtin helper for git-add--interactive, which right now is not
able to do anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 0d77ea5894..2ee71ed217 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index 1a44c811aa..9c84b80739 100644
--- a/Makefile
+++ b/Makefile
@@ -1023,6 +1023,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..dd811ef7d5 100644
--- a/builtin.h
+++ b/builtin.h
@@ -128,6 +128,7 @@ extern void setup_auto_pager(const char *cmd, int def);
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000000..6a97f0e191
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 2f604a41ea..5507591f2e 100644
--- a/git.c
+++ b/git.c
@@ -443,6 +443,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
gitgitgadget

[PATCH 3/7] add-interactive.c: implement status command

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Add new files: add-interactive.c and add-interactive.h, which
will be used for implementing "application logic" of git add -i,
whereas add--helper.c will be used mostly for parsing the command line.
We're a bit lax with the command-line parsing, as the command is
intended to be called only by one internal user: the add--interactive script.

Implement add --interactive's status command in add-interactive.c and
use it in builtin add--helper.c.

It prints a numstat comparing changed files between a) the worktree and
the index; b) the index and the HEAD.

To do so, we use run_diff_index() and run_diff_files() to get changed
files, use the diffstat API on them to get the numstat and use a
combination of a hashmap and qsort() to print the result in
O(n) + O(n lg n) complexity.

This is the first interactive add command implemented in C of those
anticipated by the previous commit, which introduced
the add--helper built-in.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 Makefile              |   1 +
 add-interactive.c     | 246 ++++++++++++++++++++++++++++++++++++++++++
 add-interactive.h     |   8 ++
 builtin/add--helper.c |  32 ++++++
 4 files changed, 287 insertions(+)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h

diff --git a/Makefile b/Makefile
index 9c84b80739..2a4a5cc37b 100644
--- a/Makefile
+++ b/Makefile
@@ -827,6 +827,7 @@ LIB_H = $(shell $(FIND) . \
 	-name '*.h' -print)
 
 LIB_OBJS += abspath.o
+LIB_OBJS += add-interactive.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
diff --git a/add-interactive.c b/add-interactive.c
new file mode 100644
index 0000000000..c55d934186
--- /dev/null
+++ b/add-interactive.c
@@ -0,0 +1,246 @@
+#include "add-interactive.h"
+#include "cache.h"
+#include "commit.h"
+#include "color.h"
+#include "config.h"
+#include "diffcore.h"
+#include "revision.h"
+
+#define HEADER_INDENT "      "
+
+enum collection_phase {
+	WORKTREE,
+	INDEX
+};
+
+struct file_stat {
+	struct hashmap_entry ent;
+	struct {
+		uintmax_t added, deleted;
+	} index, worktree;
+	char name[FLEX_ARRAY];
+};
+
+struct collection_status {
+	enum collection_phase phase;
+
+	const char *reference;
+	struct pathspec pathspec;
+
+	struct hashmap file_map;
+};
+
+static int use_color = -1;
+enum color_add_i {
+	COLOR_PROMPT,
+	COLOR_HEADER,
+	COLOR_HELP,
+	COLOR_ERROR
+};
+
+static char colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_BOLD_BLUE, /* Prompt */
+	GIT_COLOR_BOLD,      /* Header */
+	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_BOLD_RED   /* Error */
+};
+
+static const char *get_color(enum color_add_i ix)
+{
+	if (want_color(use_color))
+		return colors[ix];
+	return "";
+}
+
+static int parse_color_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "prompt"))
+		return COLOR_PROMPT;
+	if (!strcasecmp(slot, "header"))
+		return COLOR_HEADER;
+	if (!strcasecmp(slot, "help"))
+		return COLOR_HELP;
+	if (!strcasecmp(slot, "error"))
+		return COLOR_ERROR;
+
+	return -1;
+}
+
+int add_i_config(const char *var,
+		const char *value, void *cbdata)
+{
+	const char *name;
+
+	if (!strcmp(var, "color.interactive")) {
+		use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+
+	if (skip_prefix(var, "color.interactive.", &name)) {
+		int slot = parse_color_slot(name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, colors[slot]);
+	}
+
+	return git_default_config(var, value, cbdata);
+}
+
+static int hash_cmp(const void *unused_cmp_data, const void *entry,
+			const void *entry_or_key, const void *keydata)
+{
+	const struct file_stat *e1 = entry, *e2 = entry_or_key;
+	const char *name = keydata ? keydata : e2->name;
+
+	return strcmp(e1->name, name);
+}
+
+static int alphabetical_cmp(const void *a, const void *b)
+{
+	struct file_stat *f1 = *((struct file_stat **)a);
+	struct file_stat *f2 = *((struct file_stat **)b);
+
+	return strcmp(f1->name, f2->name);
+}
+
+static void collect_changes_cb(struct diff_queue_struct *q,
+					 struct diff_options *options,
+					 void *data)
+{
+	struct collection_status *s = data;
+	struct diffstat_t stat = { 0 };
+	int i;
+
+	if (!q->nr)
+		return;
+
+	compute_diffstat(options, &stat);
+
+	for (i = 0; i < stat.nr; i++) {
+		struct file_stat *entry;
+		const char *name = stat.files[i]->name;
+		unsigned int hash = strhash(name);
+
+		entry = hashmap_get_from_hash(&s->file_map, hash, name);
+		if (!entry) {
+			FLEX_ALLOC_STR(entry, name, name);
+			hashmap_entry_init(entry, hash);
+			hashmap_add(&s->file_map, entry);
+		}
+
+		if (s->phase == WORKTREE) {
+			entry->worktree.added = stat.files[i]->added;
+			entry->worktree.deleted = stat.files[i]->deleted;
+		} else if (s->phase == INDEX) {
+			entry->index.added = stat.files[i]->added;
+			entry->index.deleted = stat.files[i]->deleted;
+		}
+	}
+}
+
+static void collect_changes_worktree(struct collection_status *s)
+{
+	struct rev_info rev;
+
+	s->phase = WORKTREE;
+
+	init_revisions(&rev, NULL);
+	setup_revisions(0, NULL, &rev, NULL);
+
+	rev.max_count = 0;
+
+	rev.diffopt.flags.ignore_dirty_submodules = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_files(&rev, 0);
+}
+
+static void collect_changes_index(struct collection_status *s)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt = { 0 };
+
+	s->phase = INDEX;
+
+	init_revisions(&rev, NULL);
+	opt.def = s->reference;
+	setup_revisions(0, NULL, &rev, &opt);
+
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_index(&rev, 1);
+}
+
+void add_i_print_modified(void)
+{
+	int i = 0;
+	struct collection_status s;
+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
+	const char *modified_fmt = _("%12s %12s %s");
+	const char *header_color = get_color(COLOR_HEADER);
+	struct object_id sha1;
+
+	struct hashmap_iter iter;
+	struct file_stat **files;
+	struct file_stat *entry;
+
+	if (read_cache() < 0)
+		return;
+
+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
+
+	collect_changes_worktree(&s);
+	collect_changes_index(&s);
+
+	if (hashmap_get_size(&s.file_map) < 1) {
+		printf("\n");
+		return;
+	}
+
+	printf(HEADER_INDENT);
+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
+			_("unstaged"), _("path"));
+	printf("\n");
+
+	hashmap_iter_init(&s.file_map, &iter);
+
+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
+	while ((entry = hashmap_iter_next(&iter))) {
+		files[i++] = entry;
+	}
+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
+
+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
+		struct file_stat *f = files[i];
+
+		char worktree_changes[50];
+		char index_changes[50];
+
+		if (f->worktree.added || f->worktree.deleted)
+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
+					f->worktree.deleted);
+		else
+			snprintf(worktree_changes, 50, "%s", _("nothing"));
+
+		if (f->index.added || f->index.deleted)
+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
+					f->index.deleted);
+		else
+			snprintf(index_changes, 50, "%s", _("unchanged"));
+
+		printf(" %2d: ", i + 1);
+		printf(modified_fmt, index_changes, worktree_changes, f->name);
+		printf("\n");
+	}
+	printf("\n");
+
+	free(files);
+	hashmap_free(&s.file_map, 1);
+}
diff --git a/add-interactive.h b/add-interactive.h
new file mode 100644
index 0000000000..1f4747553c
--- /dev/null
+++ b/add-interactive.h
@@ -0,0 +1,8 @@
+#ifndef ADD_INTERACTIVE_H
+#define ADD_INTERACTIVE_H
+
+int add_i_config(const char *var, const char *value, void *cbdata);
+
+void add_i_print_modified(void);
+
+#endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 6a97f0e191..43545d9af5 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -1,6 +1,38 @@
+#include "add-interactive.h"
 #include "builtin.h"
+#include "config.h"
+#include "revision.h"
+
+static const char * const builtin_add_helper_usage[] = {
+	N_("git add-interactive--helper <command>"),
+	NULL
+};
+
+enum cmd_mode {
+	DEFAULT = 0,
+	STATUS
+};
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
 {
+	enum cmd_mode mode = DEFAULT;
+
+	struct option options[] = {
+		OPT_CMDMODE(0, "status", &mode,
+			 N_("print status information with diffstat"), STATUS),
+		OPT_END()
+	};
+
+	git_config(add_i_config, NULL);
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_add_helper_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (mode == STATUS)
+		add_i_print_modified();
+	else
+		usage_with_options(builtin_add_helper_usage,
+				   options);
+
 	return 0;
 }
-- 
gitgitgadget

[PATCH 4/7] add--interactive.perl: use add--helper --status for status_cmd

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Call the newly introduced add--helper builtin on
status_cmd() instead of relying on add--interactive's Perl
functions to build print the numstat.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..a6536f9cf3 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -597,9 +597,7 @@ EOF
 }
 
 sub status_cmd {
-	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
-			list_modified());
-	print "\n";
+	system(qw(git add--helper --status));
 }
 
 sub say_n_paths {
-- 
gitgitgadget

[PATCH 5/7] add-interactive.c: implement show-help command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 19 +++++++++++++++++++
 add-interactive.h     |  2 ++
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/add-interactive.c b/add-interactive.c
index c55d934186..ff5bfbac49 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -8,6 +8,16 @@
 
 #define HEADER_INDENT "      "
 
+/* TRANSLATORS: please do not translate the command names
+   'status', 'update', 'revert', etc. */
+static const char help_info[] = 
+		N_("status        - show paths with changes\n"
+		"update        - add working tree state to the staged set of changes\n"
+		"revert        - revert staged set of changes back to the HEAD version\n"
+		"patch         - pick hunks and update selectively\n"
+		"diff          - view diff between HEAD and index\n"
+		"add untracked - add contents of untracked files to the staged set of changes");
+
 enum collection_phase {
 	WORKTREE,
 	INDEX
@@ -244,3 +254,12 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	const char *modified_fmt = _("%s");
+	printf("\n");
+	color_fprintf(stdout, help_color, modified_fmt, _(help_info));
+	printf("\n");
+}
diff --git a/add-interactive.h b/add-interactive.h
index 1f4747553c..a74c65b7e1 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_print_modified(void);
 
+void show_help(void);
+
 #endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 43545d9af5..e288412d56 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			 N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			 N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_print_modified();
+	else if (mode == HELP)
+		show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
gitgitgadget

[PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

To enable testing the colored output on Windows, enable TTY
by using environment variable GIT_TEST_PRETEND_TTY.

This is the original idea by Johannes Schindelin.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 color.c     | 4 ++++
 perl/Git.pm | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/color.c b/color.c
index ebb222ec33..4aa6cc3442 100644
--- a/color.c
+++ b/color.c
@@ -323,6 +323,10 @@ static int check_auto_color(int fd)
 {
 	static int color_stderr_is_tty = -1;
 	int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
+	
+	if (git_env_bool("GIT_TEST_PRETEND_TTY", 0))
+		return 1;
+
 	if (*is_tty_p < 0)
 		*is_tty_p = isatty(fd);
 	if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
diff --git a/perl/Git.pm b/perl/Git.pm
index d856930b2e..51a1ce0617 100644
--- a/perl/Git.pm
+++ b/perl/Git.pm
@@ -757,7 +757,7 @@ and returns boolean (true for "use color", false for "do not use color").
 
 sub get_colorbool {
 	my ($self, $var) = @_;
-	my $stdout_to_tty = (-t STDOUT) ? "true" : "false";
+	my $stdout_to_tty = $ENV{GIT_TEST_PRETEND_TTY} || (-t STDOUT) ? "true" : "false";
 	my $use_color = $self->command_oneline('config', '--get-colorbool',
 					       $var, $stdout_to_tty);
 	return ($use_color eq 'true');
-- 
gitgitgadget

[PATCH 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

Add test to t3701-add-interactive to verify that show-help
outputs expected content. Use GIT_PRETENT_TTY
introduced in earlier commit to be able to test output color
on Windows.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl  | 11 +----------
 t/t3701-add-interactive.sh | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index a6536f9cf3..32ee729a58 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1717,16 +1717,7 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	system(qw(git add--helper --show-help));
 }
 
 sub process_args {
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 65dfbc033a..9c9d5bd935 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -639,4 +639,29 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'show help from add--helper' '
+	git reset --hard &&
+	cat >expect <<-\EOF &&
+
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> 
+	<BOLD;RED>status        - show paths with changes
+	update        - add working tree state to the staged set of changes
+	revert        - revert staged set of changes back to the HEAD version
+	patch         - pick hunks and update selectively
+	diff          - view diff between HEAD and index
+	add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> 
+	Bye.
+	EOF
+	test_write_lines h | GIT_TEST_PRETEND_TTY=1 git add -i >actual.colored &&
+	test_decode_color <actual.colored >actual &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
gitgitgadget

[PATCH 0/7] Turn git add-i into built-in

[Johannes Schindelin]

From: "Slavica Đukić via GitGitGadget" <gitgitgadget@gmail.com>

This is the first version of a patch series to start porting
git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
a head start:
https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u

Daniel Ferreira (4):
  diff: export diffstat interface
  add--helper: create builtin helper for interactive add
  add-interactive.c: implement status command
  add--interactive.perl: use add--helper --status for status_cmd

Slavica Djukic (3):
  add-interactive.c: implement show-help command
  Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY
  add--interactive.perl: use add--helper --show-help for help_cmd

 .gitignore                 |   1 +
 Makefile                   |   2 +
 add-interactive.c          | 265 +++++++++++++++++++++++++++++++++++++
 add-interactive.h          |  10 ++
 builtin.h                  |   1 +
 builtin/add--helper.c      |  43 ++++++
 color.c                    |   4 +
 diff.c                     |  36 ++---
 diff.h                     |  18 +++
 git-add--interactive.perl  |  15 +--
 git.c                      |   1 +
 perl/Git.pm                |   2 +-
 t/t3701-add-interactive.sh |  25 ++++
 13 files changed, 387 insertions(+), 36 deletions(-)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h
 create mode 100644 builtin/add--helper.c


base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-103%2FslavicaDj%2Fadd-i-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/103
-- 
gitgitgadget

Re: [PATCH 0/7] Turn git add-i into built-in

[Johannes Schindelin]

[-- Attachment #1: Type: text/plain, Size: 2168 bytes --]

Hi,

just a note: this mail had not been sent by GitGitGadget (and hence has me
as sender, even if the email address is GitGitGadget's) because it still
has problems with From: and To: and Cc: headers that contain non-ASCII
characters. I hope to find the time soon to work on this.

Ciao,
Johannes

On Thu, 20 Dec 2018, Johannes Schindelin wrote:

> From: "Slavica Đukić via GitGitGadget" <gitgitgadget@gmail.com>
> 
> This is the first version of a patch series to start porting
> git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
> a head start:
> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u
> 
> Daniel Ferreira (4):
>   diff: export diffstat interface
>   add--helper: create builtin helper for interactive add
>   add-interactive.c: implement status command
>   add--interactive.perl: use add--helper --status for status_cmd
> 
> Slavica Djukic (3):
>   add-interactive.c: implement show-help command
>   Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY
>   add--interactive.perl: use add--helper --show-help for help_cmd
> 
>  .gitignore                 |   1 +
>  Makefile                   |   2 +
>  add-interactive.c          | 265 +++++++++++++++++++++++++++++++++++++
>  add-interactive.h          |  10 ++
>  builtin.h                  |   1 +
>  builtin/add--helper.c      |  43 ++++++
>  color.c                    |   4 +
>  diff.c                     |  36 ++---
>  diff.h                     |  18 +++
>  git-add--interactive.perl  |  15 +--
>  git.c                      |   1 +
>  perl/Git.pm                |   2 +-
>  t/t3701-add-interactive.sh |  25 ++++
>  13 files changed, 387 insertions(+), 36 deletions(-)
>  create mode 100644 add-interactive.c
>  create mode 100644 add-interactive.h
>  create mode 100644 builtin/add--helper.c
> 
> 
> base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
> Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-103%2FslavicaDj%2Fadd-i-v1
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v1
> Pull-Request: https://github.com/gitgitgadget/git/pull/103
> -- 
> gitgitgadget
> 

Re: [PATCH 0/7] Turn git add-i into built-in

[Slavica Djukic]

On 20-Dec-18 1:34 PM, Johannes Schindelin wrote:
> From: "Slavica Đukić via GitGitGadget" <gitgitgadget@gmail.com>
>
> This is the first version of a patch series to start porting
> git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
> a head start:
> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u


Ping? :)


>
> Daniel Ferreira (4):
>    diff: export diffstat interface
>    add--helper: create builtin helper for interactive add
>    add-interactive.c: implement status command
>    add--interactive.perl: use add--helper --status for status_cmd
>
> Slavica Djukic (3):
>    add-interactive.c: implement show-help command
>    Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY
>    add--interactive.perl: use add--helper --show-help for help_cmd
>
>   .gitignore                 |   1 +
>   Makefile                   |   2 +
>   add-interactive.c          | 265 +++++++++++++++++++++++++++++++++++++
>   add-interactive.h          |  10 ++
>   builtin.h                  |   1 +
>   builtin/add--helper.c      |  43 ++++++
>   color.c                    |   4 +
>   diff.c                     |  36 ++---
>   diff.h                     |  18 +++
>   git-add--interactive.perl  |  15 +--
>   git.c                      |   1 +
>   perl/Git.pm                |   2 +-
>   t/t3701-add-interactive.sh |  25 ++++
>   13 files changed, 387 insertions(+), 36 deletions(-)
>   create mode 100644 add-interactive.c
>   create mode 100644 add-interactive.h
>   create mode 100644 builtin/add--helper.c
>
>
> base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
> Published-As: https://github.com/gitgitgadget/git/releases/tags/pr-103%2FslavicaDj%2Fadd-i-v1
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v1
> Pull-Request: https://github.com/gitgitgadget/git/pull/103

Re: [PATCH 5/7] add-interactive.c: implement show-help command

[Phillip Wood]

Hi Slavica

I think the basics of this patch are fine, I've got a few comments below

On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> Implement show-help command in add-interactive.c and use it in
> builtin add--helper.c.
> 
> Use command name "show-help" instead of "help": add--helper is
> builtin, hence add--helper --help would be intercepted by
> handle_builtin and re-routed to the help command, without ever
> calling cmd_add__helper().
> 
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  add-interactive.c     | 19 +++++++++++++++++++
>  add-interactive.h     |  2 ++
>  builtin/add--helper.c |  7 ++++++-
>  3 files changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/add-interactive.c b/add-interactive.c
> index c55d934186..ff5bfbac49 100644
> --- a/add-interactive.c
> +++ b/add-interactive.c
> @@ -8,6 +8,16 @@
>  
>  #define HEADER_INDENT "      "
>  
> +/* TRANSLATORS: please do not translate the command names
> +   'status', 'update', 'revert', etc. */
> +static const char help_info[] = 
> +		N_("status        - show paths with changes\n"
> +		"update        - add working tree state to the staged set of changes\n"
> +		"revert        - revert staged set of changes back to the HEAD version\n"
> +		"patch         - pick hunks and update selectively\n"
> +		"diff          - view diff between HEAD and index\n"
> +		"add untracked - add contents of untracked files to the staged set of changes");

If we were starting from scratch I'd suggest only translating the help
text, not the command names as this would avoid any possible problems
with the command names and indentation. As we already have this
translated it is easier to leave it as is unless the translators think
it would be useful to change it. I'd be inclined to put this definition
next to the function that uses it (or possibly in that function) so it
is easy to see what text will be printed when reading the function.

> +
>  enum collection_phase {
>  	WORKTREE,
>  	INDEX
> @@ -244,3 +254,12 @@ void add_i_print_modified(void)
>  	free(files);
>  	hashmap_free(&s.file_map, 1);
>  }
> +
> +void show_help(void)
> +{
> +	const char *help_color = get_color(COLOR_HELP);
> +	const char *modified_fmt = _("%s");

This does not need to be translated, also I'm not sure we need a
separate variable (unless something funny is happening - why has it got
'modified' in its name?)

> +	printf("\n");
> +	color_fprintf(stdout, help_color, modified_fmt, _(help_info));
> +	printf("\n");
> +}
> diff --git a/add-interactive.h b/add-interactive.h
> index 1f4747553c..a74c65b7e1 100644
> --- a/add-interactive.h
> +++ b/add-interactive.h
> @@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
>  
>  void add_i_print_modified(void);
>  
> +void show_help(void);

As this is a global function I think it needs a more specific name to
avoid clashing with a function that shows the help for a different
command. Maybe add_i_show_help() to match add_i_print_modified()?

> +
>  #endif
> \ No newline at end of file

C files should end with a new line (it is actually undefined behavior if
they don't!)

Best Wishes

Phillip

> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
> index 43545d9af5..e288412d56 100644
> --- a/builtin/add--helper.c
> +++ b/builtin/add--helper.c
> @@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
>  
>  enum cmd_mode {
>  	DEFAULT = 0,
> -	STATUS
> +	STATUS,
> +	HELP
>  };
>  
>  int cmd_add__helper(int argc, const char **argv, const char *prefix)
> @@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>  	struct option options[] = {
>  		OPT_CMDMODE(0, "status", &mode,
>  			 N_("print status information with diffstat"), STATUS),
> +		OPT_CMDMODE(0, "show-help", &mode,
> +			 N_("show help"), HELP),
>  		OPT_END()
>  	};
>  
> @@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>  
>  	if (mode == STATUS)
>  		add_i_print_modified();
> +	else if (mode == HELP)
> +		show_help();
>  	else
>  		usage_with_options(builtin_add_helper_usage,
>  				   options);
> 

Re: [PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

[Phillip Wood]

Hi Salvica/Johannes

On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> To enable testing the colored output on Windows, enable TTY
> by using environment variable GIT_TEST_PRETEND_TTY.
> 
> This is the original idea by Johannes Schindelin.

I normally use GIT_PAGER_IN_USE=1 to force colored output, is there some
reason that does not work here?

Best Wishes

Phillip

> 
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  color.c     | 4 ++++
>  perl/Git.pm | 2 +-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/color.c b/color.c
> index ebb222ec33..4aa6cc3442 100644
> --- a/color.c
> +++ b/color.c
> @@ -323,6 +323,10 @@ static int check_auto_color(int fd)
>  {
>  	static int color_stderr_is_tty = -1;
>  	int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
> +	
> +	if (git_env_bool("GIT_TEST_PRETEND_TTY", 0))
> +		return 1;
> +
>  	if (*is_tty_p < 0)
>  		*is_tty_p = isatty(fd);
>  	if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
> diff --git a/perl/Git.pm b/perl/Git.pm
> index d856930b2e..51a1ce0617 100644
> --- a/perl/Git.pm
> +++ b/perl/Git.pm
> @@ -757,7 +757,7 @@ and returns boolean (true for "use color", false for "do not use color").
>  
>  sub get_colorbool {
>  	my ($self, $var) = @_;
> -	my $stdout_to_tty = (-t STDOUT) ? "true" : "false";
> +	my $stdout_to_tty = $ENV{GIT_TEST_PRETEND_TTY} || (-t STDOUT) ? "true" : "false";
>  	my $use_color = $self->command_oneline('config', '--get-colorbool',
>  					       $var, $stdout_to_tty);
>  	return ($use_color eq 'true');
> 

Re: [PATCH 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Phillip Wood]

Hi Slavica

On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> Change help_cmd sub in git-add--interactive.perl to use
> show-help command from builtin add--helper.
> 
> Add test to t3701-add-interactive to verify that show-help
> outputs expected content. Use GIT_PRETENT_TTY
> introduced in earlier commit to be able to test output color
> on Windows.
> 

It's great to see you adding a test for this, if it isn't too much work
perhaps you could add it before changing the implementation to
demonstrate that there are no changes introduced by the conversion to C.

Best Wishes

Phillip

> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  git-add--interactive.perl  | 11 +----------
>  t/t3701-add-interactive.sh | 25 +++++++++++++++++++++++++
>  2 files changed, 26 insertions(+), 10 deletions(-)
> 
> diff --git a/git-add--interactive.perl b/git-add--interactive.perl
> index a6536f9cf3..32ee729a58 100755
> --- a/git-add--interactive.perl
> +++ b/git-add--interactive.perl
> @@ -1717,16 +1717,7 @@ sub quit_cmd {
>  }
>  
>  sub help_cmd {
> -# TRANSLATORS: please do not translate the command names
> -# 'status', 'update', 'revert', etc.
> -	print colored $help_color, __ <<'EOF' ;
> -status        - show paths with changes
> -update        - add working tree state to the staged set of changes
> -revert        - revert staged set of changes back to the HEAD version
> -patch         - pick hunks and update selectively
> -diff          - view diff between HEAD and index
> -add untracked - add contents of untracked files to the staged set of changes
> -EOF
> +	system(qw(git add--helper --show-help));
>  }
>  
>  sub process_args {
> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
> index 65dfbc033a..9c9d5bd935 100755
> --- a/t/t3701-add-interactive.sh
> +++ b/t/t3701-add-interactive.sh
> @@ -639,4 +639,29 @@ test_expect_success 'add -p patch editing works with pathological context lines'
>  	test_cmp expected-2 actual
>  '
>  
> +test_expect_success 'show help from add--helper' '
> +	git reset --hard &&
> +	cat >expect <<-\EOF &&
> +
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> 
> +	<BOLD;RED>status        - show paths with changes
> +	update        - add working tree state to the staged set of changes
> +	revert        - revert staged set of changes back to the HEAD version
> +	patch         - pick hunks and update selectively
> +	diff          - view diff between HEAD and index
> +	add untracked - add contents of untracked files to the staged set of changes<RESET>
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> 
> +	Bye.
> +	EOF
> +	test_write_lines h | GIT_TEST_PRETEND_TTY=1 git add -i >actual.colored &&
> +	test_decode_color <actual.colored >actual &&
> +	test_i18ncmp expect actual
> +'
> +
>  test_done
> 

Re: [PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

[Slavica Djukic]

Hi Phillip,

First of all, thank you for taking your time to review this patch series.

On 14-Jan-19 12:13 PM, Phillip Wood wrote:
> Hi Salvica/Johannes
>
> On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
>> From: Slavica Djukic <slawica92@hotmail.com>
>>
>> To enable testing the colored output on Windows, enable TTY
>> by using environment variable GIT_TEST_PRETEND_TTY.
>>
>> This is the original idea by Johannes Schindelin.
> I normally use GIT_PAGER_IN_USE=1 to force colored output, is there some
> reason that does not work here?


I tried that approach, and it turns out GIT_PAGER_IN_USE=1 does force 
colored output.

As for the changes suggested in the other two e-mails -- I will apply 
them as well and send re-roll.


Thank you,

Slavica


>
> Best Wishes
>
> Phillip
>
>> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>> ---
>>   color.c     | 4 ++++
>>   perl/Git.pm | 2 +-
>>   2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/color.c b/color.c
>> index ebb222ec33..4aa6cc3442 100644
>> --- a/color.c
>> +++ b/color.c
>> @@ -323,6 +323,10 @@ static int check_auto_color(int fd)
>>   {
>>   	static int color_stderr_is_tty = -1;
>>   	int *is_tty_p = fd == 1 ? &color_stdout_is_tty : &color_stderr_is_tty;
>> +	
>> +	if (git_env_bool("GIT_TEST_PRETEND_TTY", 0))
>> +		return 1;
>> +
>>   	if (*is_tty_p < 0)
>>   		*is_tty_p = isatty(fd);
>>   	if (*is_tty_p || (fd == 1 && pager_in_use() && pager_use_color)) {
>> diff --git a/perl/Git.pm b/perl/Git.pm
>> index d856930b2e..51a1ce0617 100644
>> --- a/perl/Git.pm
>> +++ b/perl/Git.pm
>> @@ -757,7 +757,7 @@ and returns boolean (true for "use color", false for "do not use color").
>>   
>>   sub get_colorbool {
>>   	my ($self, $var) = @_;
>> -	my $stdout_to_tty = (-t STDOUT) ? "true" : "false";
>> +	my $stdout_to_tty = $ENV{GIT_TEST_PRETEND_TTY} || (-t STDOUT) ? "true" : "false";
>>   	my $use_color = $self->command_oneline('config', '--get-colorbool',
>>   					       $var, $stdout_to_tty);
>>   	return ($use_color eq 'true');
>>

Re: [PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

[Johannes Schindelin]

Hi Phillip,

On Mon, 14 Jan 2019, Phillip Wood wrote:

> Hi Salvica/Johannes

Close ;-)

> On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
> > From: Slavica Djukic <slawica92@hotmail.com>
> > 
> > To enable testing the colored output on Windows, enable TTY
> > by using environment variable GIT_TEST_PRETEND_TTY.
> > 
> > This is the original idea by Johannes Schindelin.
> 
> I normally use GIT_PAGER_IN_USE=1 to force colored output, is there some
> reason that does not work here?

As Slavica found out, you need to set `TERM`, too, for that to work. And
even then, it is more of a "happens to do what we want" rather than a
"this is what we want to happen"...

But I'm fine either way, the color code does not really *need* more
complexity, as it were...

Ciao,
Dscho

Re: [PATCH 6/7] Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY

[Phillip Wood]

On 15/01/2019 13:50, Johannes Schindelin wrote:
> Hi Phillip,
> 
> On Mon, 14 Jan 2019, Phillip Wood wrote:
> 
>> Hi Salvica/Johannes
> 
> Close ;-)

Sorry Slavica

> 
>> On 20/12/2018 12:09, Slavica Djukic via GitGitGadget wrote:
>>> From: Slavica Djukic <slawica92@hotmail.com>
>>>
>>> To enable testing the colored output on Windows, enable TTY
>>> by using environment variable GIT_TEST_PRETEND_TTY.
>>>
>>> This is the original idea by Johannes Schindelin.
>>
>> I normally use GIT_PAGER_IN_USE=1 to force colored output, is there some
>> reason that does not work here?
> 
> As Slavica found out, you need to set `TERM`, too, for that to work. And
> even then, it is more of a "happens to do what we want" rather than a
> "this is what we want to happen"...
> 
> But I'm fine either way, the color code does not really *need* more
> complexity, as it were...

Thanks for explaining, I didn't know the TERM needed to be set as well. 
If GIT_PAGER_IN_USE=1 works then maybe it is better to avoid adding any 
more complexity.

Best Wishes

Phillip

> 
> Ciao,
> Dscho
> 

[PATCH v2 0/7] Turn git add-i into built-in

[Slavica Đukić via GitGitGadget]

This is the first version of a patch series to start porting
git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
a head start:
https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u

Changes since v1:

 * rename show_help() to add_i_show_help()
 * move static const char help_info[] to add_i_show_help() and translate
   only the help text
 * add newline at the end of add-interactive.h
 * modify commits so that the test is introduced before making
   git-add--interactive.perl's help_cmd to use add_i_show_help
 * use variables GIT_PAGER_IN_USE=true and TERM=vt100 in test as alternative
   for GIT_PRETEND_TTY

Daniel Ferreira (4):
  diff: export diffstat interface
  add--helper: create builtin helper for interactive add
  add-interactive.c: implement status command
  add--interactive.perl: use add--helper --status for status_cmd

Slavica Djukic (3):
  add-interactive.c: implement show-help command
  t3701-add-interactive: test add_i_show_help()
  add--interactive.perl: use add--helper --show-help for help_cmd

 .gitignore                 |   1 +
 Makefile                   |   2 +
 add-interactive.c          | 269 +++++++++++++++++++++++++++++++++++++
 add-interactive.h          |  10 ++
 builtin.h                  |   1 +
 builtin/add--helper.c      |  43 ++++++
 diff.c                     |  36 ++---
 diff.h                     |  18 +++
 git-add--interactive.perl  |  15 +--
 git.c                      |   1 +
 t/t3701-add-interactive.sh |  24 ++++
 11 files changed, 385 insertions(+), 35 deletions(-)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h
 create mode 100644 builtin/add--helper.c


base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/103

Range-diff vs v1:

 1:  737767b6f4 = 1:  737767b6f4 diff: export diffstat interface
 2:  91b1963125 = 2:  91b1963125 add--helper: create builtin helper for interactive add
 3:  d247ef69fe = 3:  d247ef69fe add-interactive.c: implement status command
 4:  4950c889aa = 4:  4950c889aa add--interactive.perl: use add--helper --status for status_cmd
 5:  19fdea5db1 ! 5:  cf4e913a5a add-interactive.c: implement show-help command
     @@ -16,33 +16,30 @@
       --- a/add-interactive.c
       +++ b/add-interactive.c
      @@
     - 
     - #define HEADER_INDENT "      "
     - 
     -+/* TRANSLATORS: please do not translate the command names
     -+   'status', 'update', 'revert', etc. */
     -+static const char help_info[] = 
     -+		N_("status        - show paths with changes\n"
     -+		"update        - add working tree state to the staged set of changes\n"
     -+		"revert        - revert staged set of changes back to the HEAD version\n"
     -+		"patch         - pick hunks and update selectively\n"
     -+		"diff          - view diff between HEAD and index\n"
     -+		"add untracked - add contents of untracked files to the staged set of changes");
     -+
     - enum collection_phase {
     - 	WORKTREE,
     - 	INDEX
     -@@
       	free(files);
       	hashmap_free(&s.file_map, 1);
       }
      +
     -+void show_help(void)
     ++void add_i_show_help(void)
      +{
      +	const char *help_color = get_color(COLOR_HELP);
     -+	const char *modified_fmt = _("%s");
     ++	color_fprintf(stdout, help_color, "%s%s", _("status"), 
     ++		N_("        - show paths with changes"));
     ++	printf("\n");
     ++	color_fprintf(stdout, help_color, "%s%s", _("update"), 
     ++		N_("        - add working tree state to the staged set of changes"));
     ++	printf("\n");	
     ++	color_fprintf(stdout, help_color, "%s%s", _("revert"),
     ++		N_("        - revert staged set of changes back to the HEAD version"));
      +	printf("\n");
     -+	color_fprintf(stdout, help_color, modified_fmt, _(help_info));
     ++	color_fprintf(stdout, help_color, "%s%s", _("patch"),
     ++		N_("         - pick hunks and update selectively"));
     ++	printf("\n");
     ++	color_fprintf(stdout, help_color, "%s%s", _("diff"),
     ++		N_("          - view diff between HEAD and index"));
     ++	printf("\n");
     ++	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
     ++		N_(" - add contents of untracked files to the staged set of changes"));
      +	printf("\n");
      +}
      
     @@ -53,10 +50,11 @@
       
       void add_i_print_modified(void);
       
     -+void show_help(void);
     -+
     - #endif
     +-#endif
       \ No newline at end of file
     ++void add_i_show_help(void);
     ++
     ++#endif
      
       diff --git a/builtin/add--helper.c b/builtin/add--helper.c
       --- a/builtin/add--helper.c
     @@ -85,7 +83,7 @@
       	if (mode == STATUS)
       		add_i_print_modified();
      +	else if (mode == HELP)
     -+		show_help();
     ++		add_i_show_help();
       	else
       		usage_with_options(builtin_add_helper_usage,
       				   options);
 6:  86d85face8 < -:  ---------- Git.pm: introduce environment variable GIT_TEST_PRETEND_TTY
 -:  ---------- > 6:  2b4714b8d0 t3701-add-interactive: test add_i_show_help()
 7:  060806010e ! 7:  6ede6d9251 add--interactive.perl: use add--helper --show-help for help_cmd
     @@ -5,11 +5,6 @@
          Change help_cmd sub in git-add--interactive.perl to use
          show-help command from builtin add--helper.
      
     -    Add test to t3701-add-interactive to verify that show-help
     -    outputs expected content. Use GIT_PRETENT_TTY
     -    introduced in earlier commit to be able to test output color
     -    on Windows.
     -
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
       diff --git a/git-add--interactive.perl b/git-add--interactive.perl
     @@ -33,37 +28,3 @@
       }
       
       sub process_args {
     -
     - diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
     - --- a/t/t3701-add-interactive.sh
     - +++ b/t/t3701-add-interactive.sh
     -@@
     - 	test_cmp expected-2 actual
     - '
     - 
     -+test_expect_success 'show help from add--helper' '
     -+	git reset --hard &&
     -+	cat >expect <<-\EOF &&
     -+
     -+	<BOLD>*** Commands ***<RESET>
     -+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
     -+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
     -+	<BOLD;BLUE>What now<RESET>> 
     -+	<BOLD;RED>status        - show paths with changes
     -+	update        - add working tree state to the staged set of changes
     -+	revert        - revert staged set of changes back to the HEAD version
     -+	patch         - pick hunks and update selectively
     -+	diff          - view diff between HEAD and index
     -+	add untracked - add contents of untracked files to the staged set of changes<RESET>
     -+	<BOLD>*** Commands ***<RESET>
     -+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
     -+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
     -+	<BOLD;BLUE>What now<RESET>> 
     -+	Bye.
     -+	EOF
     -+	test_write_lines h | GIT_TEST_PRETEND_TTY=1 git add -i >actual.colored &&
     -+	test_decode_color <actual.colored >actual &&
     -+	test_i18ncmp expect actual
     -+'
     -+
     - test_done

-- 
gitgitgadget

[PATCH v2 1/7] diff: export diffstat interface

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 diff.c | 36 ++++++++++++++----------------------
 diff.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/diff.c b/diff.c
index dc9965e836..46a7d8cf29 100644
--- a/diff.c
+++ b/diff.c
@@ -2421,22 +2421,6 @@ static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 	}
 }
 
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
 					  const char *name_a,
 					  const char *name_b)
@@ -5922,12 +5906,7 @@ void diff_flush(struct diff_options *options)
 	    dirstat_by_line) {
 		struct diffstat_t diffstat;
 
-		memset(&diffstat, 0, sizeof(struct diffstat_t));
-		for (i = 0; i < q->nr; i++) {
-			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p))
-				diff_flush_stat(p, options, &diffstat);
-		}
+		compute_diffstat(options, &diffstat);
 		if (output_format & DIFF_FORMAT_NUMSTAT)
 			show_numstat(&diffstat, options);
 		if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -6227,6 +6206,19 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 	return ignored;
 }
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
+{
+	int i;
+	struct diff_queue_struct *q = &diff_queued_diff;
+
+	memset(diffstat, 0, sizeof(struct diffstat_t));
+	for (i = 0; i < q->nr; i++) {
+		struct diff_filepair *p = q->queue[i];
+		if (check_pair_status(p))
+			diff_flush_stat(p, options, diffstat);
+	}
+}
+
 void diff_addremove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const struct object_id *oid,
diff --git a/diff.h b/diff.h
index ce5e8a8183..7809db3039 100644
--- a/diff.h
+++ b/diff.h
@@ -239,6 +239,22 @@ void diff_emit_submodule_error(struct diff_options *o, const char *err);
 void diff_emit_submodule_pipethrough(struct diff_options *o,
 				     const char *line, int len);
 
+struct diffstat_t {
+	int nr;
+	int alloc;
+	struct diffstat_file {
+		char *from_name;
+		char *name;
+		char *print_name;
+		const char *comments;
+		unsigned is_unmerged:1;
+		unsigned is_binary:1;
+		unsigned is_renamed:1;
+		unsigned is_interesting:1;
+		uintmax_t added, deleted;
+	} **files;
+};
+
 enum color_diff {
 	DIFF_RESET = 0,
 	DIFF_CONTEXT = 1,
@@ -327,6 +343,8 @@ void diff_change(struct diff_options *,
 
 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat);
+
 #define DIFF_SETUP_REVERSE      	1
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-- 
gitgitgadget

[PATCH v2 2/7] add--helper: create builtin helper for interactive add

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Create a builtin helper for git-add--interactive, which right now is not
able to do anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 0d77ea5894..2ee71ed217 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index 1a44c811aa..9c84b80739 100644
--- a/Makefile
+++ b/Makefile
@@ -1023,6 +1023,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..dd811ef7d5 100644
--- a/builtin.h
+++ b/builtin.h
@@ -128,6 +128,7 @@ extern void setup_auto_pager(const char *cmd, int def);
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000000..6a97f0e191
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 2f604a41ea..5507591f2e 100644
--- a/git.c
+++ b/git.c
@@ -443,6 +443,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
gitgitgadget

[PATCH v2 3/7] add-interactive.c: implement status command

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Add new files: add-interactive.c and add-interactive.h, which
will be used for implementing "application logic" of git add -i,
whereas add--helper.c will be used mostly for parsing the command line.
We're a bit lax with the command-line parsing, as the command is
intended to be called only by one internal user: the add--interactive script.

Implement add --interactive's status command in add-interactive.c and
use it in builtin add--helper.c.

It prints a numstat comparing changed files between a) the worktree and
the index; b) the index and the HEAD.

To do so, we use run_diff_index() and run_diff_files() to get changed
files, use the diffstat API on them to get the numstat and use a
combination of a hashmap and qsort() to print the result in
O(n) + O(n lg n) complexity.

This is the first interactive add command implemented in C of those
anticipated by the previous commit, which introduced
the add--helper built-in.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 Makefile              |   1 +
 add-interactive.c     | 246 ++++++++++++++++++++++++++++++++++++++++++
 add-interactive.h     |   8 ++
 builtin/add--helper.c |  32 ++++++
 4 files changed, 287 insertions(+)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h

diff --git a/Makefile b/Makefile
index 9c84b80739..2a4a5cc37b 100644
--- a/Makefile
+++ b/Makefile
@@ -827,6 +827,7 @@ LIB_H = $(shell $(FIND) . \
 	-name '*.h' -print)
 
 LIB_OBJS += abspath.o
+LIB_OBJS += add-interactive.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
diff --git a/add-interactive.c b/add-interactive.c
new file mode 100644
index 0000000000..c55d934186
--- /dev/null
+++ b/add-interactive.c
@@ -0,0 +1,246 @@
+#include "add-interactive.h"
+#include "cache.h"
+#include "commit.h"
+#include "color.h"
+#include "config.h"
+#include "diffcore.h"
+#include "revision.h"
+
+#define HEADER_INDENT "      "
+
+enum collection_phase {
+	WORKTREE,
+	INDEX
+};
+
+struct file_stat {
+	struct hashmap_entry ent;
+	struct {
+		uintmax_t added, deleted;
+	} index, worktree;
+	char name[FLEX_ARRAY];
+};
+
+struct collection_status {
+	enum collection_phase phase;
+
+	const char *reference;
+	struct pathspec pathspec;
+
+	struct hashmap file_map;
+};
+
+static int use_color = -1;
+enum color_add_i {
+	COLOR_PROMPT,
+	COLOR_HEADER,
+	COLOR_HELP,
+	COLOR_ERROR
+};
+
+static char colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_BOLD_BLUE, /* Prompt */
+	GIT_COLOR_BOLD,      /* Header */
+	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_BOLD_RED   /* Error */
+};
+
+static const char *get_color(enum color_add_i ix)
+{
+	if (want_color(use_color))
+		return colors[ix];
+	return "";
+}
+
+static int parse_color_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "prompt"))
+		return COLOR_PROMPT;
+	if (!strcasecmp(slot, "header"))
+		return COLOR_HEADER;
+	if (!strcasecmp(slot, "help"))
+		return COLOR_HELP;
+	if (!strcasecmp(slot, "error"))
+		return COLOR_ERROR;
+
+	return -1;
+}
+
+int add_i_config(const char *var,
+		const char *value, void *cbdata)
+{
+	const char *name;
+
+	if (!strcmp(var, "color.interactive")) {
+		use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+
+	if (skip_prefix(var, "color.interactive.", &name)) {
+		int slot = parse_color_slot(name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, colors[slot]);
+	}
+
+	return git_default_config(var, value, cbdata);
+}
+
+static int hash_cmp(const void *unused_cmp_data, const void *entry,
+			const void *entry_or_key, const void *keydata)
+{
+	const struct file_stat *e1 = entry, *e2 = entry_or_key;
+	const char *name = keydata ? keydata : e2->name;
+
+	return strcmp(e1->name, name);
+}
+
+static int alphabetical_cmp(const void *a, const void *b)
+{
+	struct file_stat *f1 = *((struct file_stat **)a);
+	struct file_stat *f2 = *((struct file_stat **)b);
+
+	return strcmp(f1->name, f2->name);
+}
+
+static void collect_changes_cb(struct diff_queue_struct *q,
+					 struct diff_options *options,
+					 void *data)
+{
+	struct collection_status *s = data;
+	struct diffstat_t stat = { 0 };
+	int i;
+
+	if (!q->nr)
+		return;
+
+	compute_diffstat(options, &stat);
+
+	for (i = 0; i < stat.nr; i++) {
+		struct file_stat *entry;
+		const char *name = stat.files[i]->name;
+		unsigned int hash = strhash(name);
+
+		entry = hashmap_get_from_hash(&s->file_map, hash, name);
+		if (!entry) {
+			FLEX_ALLOC_STR(entry, name, name);
+			hashmap_entry_init(entry, hash);
+			hashmap_add(&s->file_map, entry);
+		}
+
+		if (s->phase == WORKTREE) {
+			entry->worktree.added = stat.files[i]->added;
+			entry->worktree.deleted = stat.files[i]->deleted;
+		} else if (s->phase == INDEX) {
+			entry->index.added = stat.files[i]->added;
+			entry->index.deleted = stat.files[i]->deleted;
+		}
+	}
+}
+
+static void collect_changes_worktree(struct collection_status *s)
+{
+	struct rev_info rev;
+
+	s->phase = WORKTREE;
+
+	init_revisions(&rev, NULL);
+	setup_revisions(0, NULL, &rev, NULL);
+
+	rev.max_count = 0;
+
+	rev.diffopt.flags.ignore_dirty_submodules = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_files(&rev, 0);
+}
+
+static void collect_changes_index(struct collection_status *s)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt = { 0 };
+
+	s->phase = INDEX;
+
+	init_revisions(&rev, NULL);
+	opt.def = s->reference;
+	setup_revisions(0, NULL, &rev, &opt);
+
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_index(&rev, 1);
+}
+
+void add_i_print_modified(void)
+{
+	int i = 0;
+	struct collection_status s;
+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
+	const char *modified_fmt = _("%12s %12s %s");
+	const char *header_color = get_color(COLOR_HEADER);
+	struct object_id sha1;
+
+	struct hashmap_iter iter;
+	struct file_stat **files;
+	struct file_stat *entry;
+
+	if (read_cache() < 0)
+		return;
+
+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
+
+	collect_changes_worktree(&s);
+	collect_changes_index(&s);
+
+	if (hashmap_get_size(&s.file_map) < 1) {
+		printf("\n");
+		return;
+	}
+
+	printf(HEADER_INDENT);
+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
+			_("unstaged"), _("path"));
+	printf("\n");
+
+	hashmap_iter_init(&s.file_map, &iter);
+
+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
+	while ((entry = hashmap_iter_next(&iter))) {
+		files[i++] = entry;
+	}
+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
+
+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
+		struct file_stat *f = files[i];
+
+		char worktree_changes[50];
+		char index_changes[50];
+
+		if (f->worktree.added || f->worktree.deleted)
+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
+					f->worktree.deleted);
+		else
+			snprintf(worktree_changes, 50, "%s", _("nothing"));
+
+		if (f->index.added || f->index.deleted)
+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
+					f->index.deleted);
+		else
+			snprintf(index_changes, 50, "%s", _("unchanged"));
+
+		printf(" %2d: ", i + 1);
+		printf(modified_fmt, index_changes, worktree_changes, f->name);
+		printf("\n");
+	}
+	printf("\n");
+
+	free(files);
+	hashmap_free(&s.file_map, 1);
+}
diff --git a/add-interactive.h b/add-interactive.h
new file mode 100644
index 0000000000..1f4747553c
--- /dev/null
+++ b/add-interactive.h
@@ -0,0 +1,8 @@
+#ifndef ADD_INTERACTIVE_H
+#define ADD_INTERACTIVE_H
+
+int add_i_config(const char *var, const char *value, void *cbdata);
+
+void add_i_print_modified(void);
+
+#endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 6a97f0e191..43545d9af5 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -1,6 +1,38 @@
+#include "add-interactive.h"
 #include "builtin.h"
+#include "config.h"
+#include "revision.h"
+
+static const char * const builtin_add_helper_usage[] = {
+	N_("git add-interactive--helper <command>"),
+	NULL
+};
+
+enum cmd_mode {
+	DEFAULT = 0,
+	STATUS
+};
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
 {
+	enum cmd_mode mode = DEFAULT;
+
+	struct option options[] = {
+		OPT_CMDMODE(0, "status", &mode,
+			 N_("print status information with diffstat"), STATUS),
+		OPT_END()
+	};
+
+	git_config(add_i_config, NULL);
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_add_helper_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (mode == STATUS)
+		add_i_print_modified();
+	else
+		usage_with_options(builtin_add_helper_usage,
+				   options);
+
 	return 0;
 }
-- 
gitgitgadget

[PATCH v2 4/7] add--interactive.perl: use add--helper --status for status_cmd

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Call the newly introduced add--helper builtin on
status_cmd() instead of relying on add--interactive's Perl
functions to build print the numstat.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..a6536f9cf3 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -597,9 +597,7 @@ sub prompt_help_cmd {
 }
 
 sub status_cmd {
-	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
-			list_modified());
-	print "\n";
+	system(qw(git add--helper --status));
 }
 
 sub say_n_paths {
-- 
gitgitgadget

[PATCH v2 5/7] add-interactive.c: implement show-help command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 23 +++++++++++++++++++++++
 add-interactive.h     |  4 +++-
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/add-interactive.c b/add-interactive.c
index c55d934186..76c3f4c3eb 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -244,3 +244,26 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void add_i_show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf(stdout, help_color, "%s%s", _("status"), 
+		N_("        - show paths with changes"));
+	printf("\n");
+	color_fprintf(stdout, help_color, "%s%s", _("update"), 
+		N_("        - add working tree state to the staged set of changes"));
+	printf("\n");	
+	color_fprintf(stdout, help_color, "%s%s", _("revert"),
+		N_("        - revert staged set of changes back to the HEAD version"));
+	printf("\n");
+	color_fprintf(stdout, help_color, "%s%s", _("patch"),
+		N_("         - pick hunks and update selectively"));
+	printf("\n");
+	color_fprintf(stdout, help_color, "%s%s", _("diff"),
+		N_("          - view diff between HEAD and index"));
+	printf("\n");
+	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
+		N_(" - add contents of untracked files to the staged set of changes"));
+	printf("\n");
+}
diff --git a/add-interactive.h b/add-interactive.h
index 1f4747553c..46e17c5c71 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_print_modified(void);
 
-#endif
\ No newline at end of file
+void add_i_show_help(void);
+
+#endif
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 43545d9af5..a3b3a68b68 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			 N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			 N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_print_modified();
+	else if (mode == HELP)
+		add_i_show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
gitgitgadget

[PATCH v2 6/7] t3701-add-interactive: test add_i_show_help()

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Add test to t3701-add-interactive to verify that add_i_show_help()
outputs expected content.
Also, add it before changing git-add--interactive.perl's help_cmd
to demonstrate that there are no changes introduced by the
conversion to C.
Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
to force colored output on Windows.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 65dfbc033a..14e3286995 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'show help from add--helper' '
+	git reset --hard &&
+	cat >expect <<-\EOF &&
+
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
+	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
+	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
+	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
+	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
+	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> 
+	Bye.
+	EOF
+	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
+	test_decode_color <actual.colored >actual &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
gitgitgadget

[PATCH v2 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index a6536f9cf3..32ee729a58 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1717,16 +1717,7 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	system(qw(git add--helper --show-help));
 }
 
 sub process_args {
-- 
gitgitgadget

Re: [PATCH v2 5/7] add-interactive.c: implement show-help command

[Phillip Wood]

Hi Slavica

I think this round is looking good I've got a couple of comments about
the translation of the help text but everything else looks fine to me
now. In future when you're posting a new version it's helpful CC the
people who commented on the previous version(s).

On 18/01/2019 07:47, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> Implement show-help command in add-interactive.c and use it in
> builtin add--helper.c.
> 
> Use command name "show-help" instead of "help": add--helper is
> builtin, hence add--helper --help would be intercepted by
> handle_builtin and re-routed to the help command, without ever
> calling cmd_add__helper().
> 
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  add-interactive.c     | 23 +++++++++++++++++++++++
>  add-interactive.h     |  4 +++-
>  builtin/add--helper.c |  7 ++++++-
>  3 files changed, 32 insertions(+), 2 deletions(-)
> 
> diff --git a/add-interactive.c b/add-interactive.c
> index c55d934186..76c3f4c3eb 100644
> --- a/add-interactive.c
> +++ b/add-interactive.c
> @@ -244,3 +244,26 @@ void add_i_print_modified(void)
>  	free(files);
>  	hashmap_free(&s.file_map, 1);
>  }
> +
> +void add_i_show_help(void)
> +{
> +	const char *help_color = get_color(COLOR_HELP);
> +	color_fprintf(stdout, help_color, "%s%s", _("status"), 
> +		N_("        - show paths with changes"));
> +	printf("\n");

There seems to be a bit of confusion with the translation of these
messages. "status" does not want to be translated so it shouldn't be in
_() - it can just go in the format string as can the indentation and the
"\n" (or we could use color_fprintf_ln() to automatically add a newline
at the end. N_() is used to mark static strings for translation so the
gettext utilities pick up the text to be translated but (because
initializes for static variables must be compile-time constants) does
not do anything when the program runs - if you have 'const char *s =
N_(hello);' you have to do '_(s)' to get the translated version. Here we
can just pass the untranslated string directly to gettext so it should
be _("show paths with changes"). Putting all that together we get

	color_fprintf(stdout, help_color, "status        - %s\n",
			_("show paths with changes");


Best Wishes

Phillip

> +	color_fprintf(stdout, help_color, "%s%s", _("update"), 
> +		N_("        - add working tree state to the staged set of changes"));
> +	printf("\n");	
> +	color_fprintf(stdout, help_color, "%s%s", _("revert"),
> +		N_("        - revert staged set of changes back to the HEAD version"));
> +	printf("\n");
> +	color_fprintf(stdout, help_color, "%s%s", _("patch"),
> +		N_("         - pick hunks and update selectively"));
> +	printf("\n");
> +	color_fprintf(stdout, help_color, "%s%s", _("diff"),
> +		N_("          - view diff between HEAD and index"));
> +	printf("\n");
> +	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
> +		N_(" - add contents of untracked files to the staged set of changes"));
> +	printf("\n");
> +}
> diff --git a/add-interactive.h b/add-interactive.h
> index 1f4747553c..46e17c5c71 100644
> --- a/add-interactive.h
> +++ b/add-interactive.h
> @@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
>  
>  void add_i_print_modified(void);
>  
> -#endif
> \ No newline at end of file
> +void add_i_show_help(void);
> +
> +#endif
> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
> index 43545d9af5..a3b3a68b68 100644
> --- a/builtin/add--helper.c
> +++ b/builtin/add--helper.c
> @@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
>  
>  enum cmd_mode {
>  	DEFAULT = 0,
> -	STATUS
> +	STATUS,
> +	HELP
>  };
>  
>  int cmd_add__helper(int argc, const char **argv, const char *prefix)
> @@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>  	struct option options[] = {
>  		OPT_CMDMODE(0, "status", &mode,
>  			 N_("print status information with diffstat"), STATUS),
> +		OPT_CMDMODE(0, "show-help", &mode,
> +			 N_("show help"), HELP),
>  		OPT_END()
>  	};
>  
> @@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>  
>  	if (mode == STATUS)
>  		add_i_print_modified();
> +	else if (mode == HELP)
> +		add_i_show_help();
>  	else
>  		usage_with_options(builtin_add_helper_usage,
>  				   options);
> 

Re: [PATCH v2 6/7] t3701-add-interactive: test add_i_show_help()

[Phillip Wood]

Hi Slavica

Thanks for moving this up, it's really good to add the test before the
conversion to C.

Best Wishes

Phillip

On 18/01/2019 07:47, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> Add test to t3701-add-interactive to verify that add_i_show_help()
> outputs expected content.
> Also, add it before changing git-add--interactive.perl's help_cmd
> to demonstrate that there are no changes introduced by the
> conversion to C.
> Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
> to force colored output on Windows.
> 
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
> index 65dfbc033a..14e3286995 100755
> --- a/t/t3701-add-interactive.sh
> +++ b/t/t3701-add-interactive.sh
> @@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
>  	test_cmp expected-2 actual
>  '
>  
> +test_expect_success 'show help from add--helper' '
> +	git reset --hard &&
> +	cat >expect <<-\EOF &&
> +
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
> +	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
> +	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
> +	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
> +	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
> +	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> 
> +	Bye.
> +	EOF
> +	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
> +	test_decode_color <actual.colored >actual &&
> +	test_i18ncmp expect actual
> +'
> +
>  test_done
> 

Re: [PATCH v2 5/7] add-interactive.c: implement show-help command

[Slavica Djukic]

Hi Phillip,

On 18-Jan-19 12:20 PM, Phillip Wood wrote:
> Hi Slavica
>
> I think this round is looking good I've got a couple of comments about
> the translation of the help text but everything else looks fine to me
> now. In future when you're posting a new version it's helpful CC the
> people who commented on the previous version(s).


Thanks for taking your time to review patches again. I'm sorry for 
omitting you

in CC, but I've sent re-roll through GitGitGadget, and I guess I thought 
it would pick it up.

I'll see what happened and keep that in mind.


>
> On 18/01/2019 07:47, Slavica Djukic via GitGitGadget wrote:
>> From: Slavica Djukic <slawica92@hotmail.com>
>>
>> Implement show-help command in add-interactive.c and use it in
>> builtin add--helper.c.
>>
>> Use command name "show-help" instead of "help": add--helper is
>> builtin, hence add--helper --help would be intercepted by
>> handle_builtin and re-routed to the help command, without ever
>> calling cmd_add__helper().
>>
>> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>> ---
>>   add-interactive.c     | 23 +++++++++++++++++++++++
>>   add-interactive.h     |  4 +++-
>>   builtin/add--helper.c |  7 ++++++-
>>   3 files changed, 32 insertions(+), 2 deletions(-)
>>
>> diff --git a/add-interactive.c b/add-interactive.c
>> index c55d934186..76c3f4c3eb 100644
>> --- a/add-interactive.c
>> +++ b/add-interactive.c
>> @@ -244,3 +244,26 @@ void add_i_print_modified(void)
>>   	free(files);
>>   	hashmap_free(&s.file_map, 1);
>>   }
>> +
>> +void add_i_show_help(void)
>> +{
>> +	const char *help_color = get_color(COLOR_HELP);
>> +	color_fprintf(stdout, help_color, "%s%s", _("status"),
>> +		N_("        - show paths with changes"));
>> +	printf("\n");
> There seems to be a bit of confusion with the translation of these
> messages. "status" does not want to be translated so it shouldn't be in
> _() - it can just go in the format string as can the indentation and the
> "\n" (or we could use color_fprintf_ln() to automatically add a newline
> at the end. N_() is used to mark static strings for translation so the
> gettext utilities pick up the text to be translated but (because
> initializes for static variables must be compile-time constants) does
> not do anything when the program runs - if you have 'const char *s =
> N_(hello);' you have to do '_(s)' to get the translated version. Here we
> can just pass the untranslated string directly to gettext so it should
> be _("show paths with changes"). Putting all that together we get
>
> 	color_fprintf(stdout, help_color, "status        - %s\n",
> 			_("show paths with changes");


I thought _() was for strings that were already translated,

and N_() for strings that weren't. And I now see that I also tried to 
translate command

names as well, just the opposite of what you suggested... Thanks for 
clarifying this.


>
>
> Best Wishes
>
> Phillip
>
>> +	color_fprintf(stdout, help_color, "%s%s", _("update"),
>> +		N_("        - add working tree state to the staged set of changes"));
>> +	printf("\n");	
>> +	color_fprintf(stdout, help_color, "%s%s", _("revert"),
>> +		N_("        - revert staged set of changes back to the HEAD version"));
>> +	printf("\n");
>> +	color_fprintf(stdout, help_color, "%s%s", _("patch"),
>> +		N_("         - pick hunks and update selectively"));
>> +	printf("\n");
>> +	color_fprintf(stdout, help_color, "%s%s", _("diff"),
>> +		N_("          - view diff between HEAD and index"));
>> +	printf("\n");
>> +	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
>> +		N_(" - add contents of untracked files to the staged set of changes"));
>> +	printf("\n");
>> +}
>> diff --git a/add-interactive.h b/add-interactive.h
>> index 1f4747553c..46e17c5c71 100644
>> --- a/add-interactive.h
>> +++ b/add-interactive.h
>> @@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
>>   
>>   void add_i_print_modified(void);
>>   
>> -#endif
>> \ No newline at end of file
>> +void add_i_show_help(void);
>> +
>> +#endif
>> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
>> index 43545d9af5..a3b3a68b68 100644
>> --- a/builtin/add--helper.c
>> +++ b/builtin/add--helper.c
>> @@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
>>   
>>   enum cmd_mode {
>>   	DEFAULT = 0,
>> -	STATUS
>> +	STATUS,
>> +	HELP
>>   };
>>   
>>   int cmd_add__helper(int argc, const char **argv, const char *prefix)
>> @@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>   	struct option options[] = {
>>   		OPT_CMDMODE(0, "status", &mode,
>>   			 N_("print status information with diffstat"), STATUS),
>> +		OPT_CMDMODE(0, "show-help", &mode,
>> +			 N_("show help"), HELP),
>>   		OPT_END()
>>   	};
>>   
>> @@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>   
>>   	if (mode == STATUS)
>>   		add_i_print_modified();
>> +	else if (mode == HELP)
>> +		add_i_show_help();
>>   	else
>>   		usage_with_options(builtin_add_helper_usage,
>>   				   options);
>>

Re: [PATCH v2 5/7] add-interactive.c: implement show-help command

[Phillip Wood]

Hi Slavica

On 18/01/2019 12:19, Slavica Đukić wrote:
> Hi Phillip,
> 
> On 18-Jan-19 12:20 PM, Phillip Wood wrote:
>> Hi Slavica
>>
>> I think this round is looking good I've got a couple of comments about
>> the translation of the help text but everything else looks fine to me
>> now. In future when you're posting a new version it's helpful CC the
>> people who commented on the previous version(s).
> 
> 
> Thanks for taking your time to review patches again. I'm sorry for
> omitting you
> 
> in CC, but I've sent re-roll through GitGitGadget, and I guess I thought
> it would pick it up.
> 
> I'll see what happened and keep that in mind.

I'm not sure what GitGitGadget does about CC'ing people but Johannes 
will know

>> On 18/01/2019 07:47, Slavica Djukic via GitGitGadget wrote:
>>> From: Slavica Djukic <slawica92@hotmail.com>
>>>
>>> Implement show-help command in add-interactive.c and use it in
>>> builtin add--helper.c.
>>>
>>> Use command name "show-help" instead of "help": add--helper is
>>> builtin, hence add--helper --help would be intercepted by
>>> handle_builtin and re-routed to the help command, without ever
>>> calling cmd_add__helper().
>>>
>>> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>>> ---
>>>    add-interactive.c     | 23 +++++++++++++++++++++++
>>>    add-interactive.h     |  4 +++-
>>>    builtin/add--helper.c |  7 ++++++-
>>>    3 files changed, 32 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/add-interactive.c b/add-interactive.c
>>> index c55d934186..76c3f4c3eb 100644
>>> --- a/add-interactive.c
>>> +++ b/add-interactive.c
>>> @@ -244,3 +244,26 @@ void add_i_print_modified(void)
>>>    	free(files);
>>>    	hashmap_free(&s.file_map, 1);
>>>    }
>>> +
>>> +void add_i_show_help(void)
>>> +{
>>> +	const char *help_color = get_color(COLOR_HELP);
>>> +	color_fprintf(stdout, help_color, "%s%s", _("status"),
>>> +		N_("        - show paths with changes"));
>>> +	printf("\n");
>> There seems to be a bit of confusion with the translation of these
>> messages. "status" does not want to be translated so it shouldn't be in
>> _() - it can just go in the format string as can the indentation and the
>> "\n" (or we could use color_fprintf_ln() to automatically add a newline
>> at the end. N_() is used to mark static strings for translation so the
>> gettext utilities pick up the text to be translated but (because
>> initializes for static variables must be compile-time constants) does
>> not do anything when the program runs - if you have 'const char *s =
>> N_(hello);' you have to do '_(s)' to get the translated version. Here we
>> can just pass the untranslated string directly to gettext so it should
>> be _("show paths with changes"). Putting all that together we get
>>
>> 	color_fprintf(stdout, help_color, "status        - %s\n",
>> 			_("show paths with changes");
> 
> 
> I thought _() was for strings that were already translated,
> and N_() for strings that weren't. And I now see that I also tried to
> translate command names as well, just the opposite of what you suggested...
 > Thanks for clarifying this.

I hope my explanation made sense, feel free to email if you want to 
check anything.

Having thought about it, I don't think we should add "\n" to the format 
string as it means the color will be reset after the new line, it should 
use color_fprintf_ln() instead which adds a new line after it has reset 
the color.

Best Wishes

Phillip

>> Best Wishes
>>
>> Phillip
>>
>>> +	color_fprintf(stdout, help_color, "%s%s", _("update"),
>>> +		N_("        - add working tree state to the staged set of changes"));
>>> +	printf("\n");	
>>> +	color_fprintf(stdout, help_color, "%s%s", _("revert"),
>>> +		N_("        - revert staged set of changes back to the HEAD version"));
>>> +	printf("\n");
>>> +	color_fprintf(stdout, help_color, "%s%s", _("patch"),
>>> +		N_("         - pick hunks and update selectively"));
>>> +	printf("\n");
>>> +	color_fprintf(stdout, help_color, "%s%s", _("diff"),
>>> +		N_("          - view diff between HEAD and index"));
>>> +	printf("\n");
>>> +	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
>>> +		N_(" - add contents of untracked files to the staged set of changes"));
>>> +	printf("\n");
>>> +}
>>> diff --git a/add-interactive.h b/add-interactive.h
>>> index 1f4747553c..46e17c5c71 100644
>>> --- a/add-interactive.h
>>> +++ b/add-interactive.h
>>> @@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
>>>    
>>>    void add_i_print_modified(void);
>>>    
>>> -#endif
>>> \ No newline at end of file
>>> +void add_i_show_help(void);
>>> +
>>> +#endif
>>> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
>>> index 43545d9af5..a3b3a68b68 100644
>>> --- a/builtin/add--helper.c
>>> +++ b/builtin/add--helper.c
>>> @@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
>>>    
>>>    enum cmd_mode {
>>>    	DEFAULT = 0,
>>> -	STATUS
>>> +	STATUS,
>>> +	HELP
>>>    };
>>>    
>>>    int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>> @@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>>    	struct option options[] = {
>>>    		OPT_CMDMODE(0, "status", &mode,
>>>    			 N_("print status information with diffstat"), STATUS),
>>> +		OPT_CMDMODE(0, "show-help", &mode,
>>> +			 N_("show help"), HELP),
>>>    		OPT_END()
>>>    	};
>>>    
>>> @@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>>    
>>>    	if (mode == STATUS)
>>>    		add_i_print_modified();
>>> +	else if (mode == HELP)
>>> +		add_i_show_help();
>>>    	else
>>>    		usage_with_options(builtin_add_helper_usage,
>>>    				   options);
>>>

Re: [PATCH v2 5/7] add-interactive.c: implement show-help command

[Johannes Schindelin]

[-- Attachment #1: Type: text/plain, Size: 6631 bytes --]

Hi Phillip,

On Fri, 18 Jan 2019, Phillip Wood wrote:

> On 18/01/2019 12:19, Slavica Đukić wrote:
> > 
> > On 18-Jan-19 12:20 PM, Phillip Wood wrote:
> > >
> > > I think this round is looking good I've got a couple of comments
> > > about the translation of the help text but everything else looks
> > > fine to me now. In future when you're posting a new version it's
> > > helpful CC the people who commented on the previous version(s).
> > 
> > 
> > Thanks for taking your time to review patches again. I'm sorry for
> > omitting you
> > 
> > in CC, but I've sent re-roll through GitGitGadget, and I guess I
> > thought it would pick it up.
> > 
> > I'll see what happened and keep that in mind.
> 
> I'm not sure what GitGitGadget does about CC'ing people but Johannes
> will know

The idea is to have a footer (read: last line) of the PR description of
the form:

	Cc: Name <email@example.org>, Other <other@example.org>

i.e. a comma-separated list of recipients to Cc.

Yes, it is under-documented, but I still need to implement more features
before I can start to polish documentation.

Ciao,
Dscho

> 
> > > On 18/01/2019 07:47, Slavica Djukic via GitGitGadget wrote:
> > > > From: Slavica Djukic <slawica92@hotmail.com>
> > > >
> > > > Implement show-help command in add-interactive.c and use it in
> > > > builtin add--helper.c.
> > > >
> > > > Use command name "show-help" instead of "help": add--helper is
> > > > builtin, hence add--helper --help would be intercepted by
> > > > handle_builtin and re-routed to the help command, without ever
> > > > calling cmd_add__helper().
> > > >
> > > > Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> > > > ---
> > > >    add-interactive.c     | 23 +++++++++++++++++++++++
> > > >    add-interactive.h     |  4 +++-
> > > >    builtin/add--helper.c |  7 ++++++-
> > > >    3 files changed, 32 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/add-interactive.c b/add-interactive.c
> > > > index c55d934186..76c3f4c3eb 100644
> > > > --- a/add-interactive.c
> > > > +++ b/add-interactive.c
> > > > @@ -244,3 +244,26 @@ void add_i_print_modified(void)
> > > >     free(files);
> > > >     hashmap_free(&s.file_map, 1);
> > > >    }
> > > > +
> > > > +void add_i_show_help(void)
> > > > +{
> > > > +	const char *help_color = get_color(COLOR_HELP);
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("status"),
> > > > +		N_("        - show paths with changes"));
> > > > +	printf("\n");
> > > There seems to be a bit of confusion with the translation of these
> > > messages. "status" does not want to be translated so it shouldn't be in
> > > _() - it can just go in the format string as can the indentation and the
> > > "\n" (or we could use color_fprintf_ln() to automatically add a newline
> > > at the end. N_() is used to mark static strings for translation so the
> > > gettext utilities pick up the text to be translated but (because
> > > initializes for static variables must be compile-time constants) does
> > > not do anything when the program runs - if you have 'const char *s =
> > > N_(hello);' you have to do '_(s)' to get the translated version. Here we
> > > can just pass the untranslated string directly to gettext so it should
> > > be _("show paths with changes"). Putting all that together we get
> > >
> > >  color_fprintf(stdout, help_color, "status        - %s\n",
> > >    _("show paths with changes");
> > 
> > 
> > I thought _() was for strings that were already translated,
> > and N_() for strings that weren't. And I now see that I also tried to
> > translate command names as well, just the opposite of what you suggested...
> > Thanks for clarifying this.
> 
> I hope my explanation made sense, feel free to email if you want to check
> anything.
> 
> Having thought about it, I don't think we should add "\n" to the format string
> as it means the color will be reset after the new line, it should use
> color_fprintf_ln() instead which adds a new line after it has reset the color.
> 
> Best Wishes
> 
> Phillip
> 
> > > Best Wishes
> > >
> > > Phillip
> > >
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("update"),
> > > > +		N_("        - add working tree state to the staged set of
> > > > changes"));
> > > > +	printf("\n");	
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("revert"),
> > > > +		N_("        - revert staged set of changes back to the HEAD
> > > > version"));
> > > > +	printf("\n");
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("patch"),
> > > > +		N_("         - pick hunks and update selectively"));
> > > > +	printf("\n");
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("diff"),
> > > > +		N_("          - view diff between HEAD and index"));
> > > > +	printf("\n");
> > > > +	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
> > > > +		N_(" - add contents of untracked files to the staged set of
> > > > changes"));
> > > > +	printf("\n");
> > > > +}
> > > > diff --git a/add-interactive.h b/add-interactive.h
> > > > index 1f4747553c..46e17c5c71 100644
> > > > --- a/add-interactive.h
> > > > +++ b/add-interactive.h
> > > > @@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value,
> > > > void *cbdata);
> > > >    
> > > >    void add_i_print_modified(void);
> > > >    
> > > > -#endif
> > > > \ No newline at end of file
> > > > +void add_i_show_help(void);
> > > > +
> > > > +#endif
> > > > diff --git a/builtin/add--helper.c b/builtin/add--helper.c
> > > > index 43545d9af5..a3b3a68b68 100644
> > > > --- a/builtin/add--helper.c
> > > > +++ b/builtin/add--helper.c
> > > > @@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] =
> > > > {
> > > >    
> > > >    enum cmd_mode {
> > > >    	DEFAULT = 0,
> > > > -	STATUS
> > > > +	STATUS,
> > > > +	HELP
> > > >    };
> > > >    
> > > >    int cmd_add__helper(int argc, const char **argv, const char *prefix)
> > > > @@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const
> > > > char *prefix)
> > > >     struct option options[] = {
> > > >      OPT_CMDMODE(0, "status", &mode,
> > > >    			 N_("print status information with diffstat"),
> > > > STATUS),
> > > > +		OPT_CMDMODE(0, "show-help", &mode,
> > > > +			 N_("show help"), HELP),
> > > >     	OPT_END()
> > > >     };
> > > >    @@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv,
> > > > const char *prefix)
> > > >    
> > > >     if (mode == STATUS)
> > > >    		add_i_print_modified();
> > > > +	else if (mode == HELP)
> > > > +		add_i_show_help();
> > > >     else
> > > >      usage_with_options(builtin_add_helper_usage,
> > > >           options);
> > > >
> 
> 
> 

[PATCH v3 0/7] Turn git add-i into built-in

[Slavica Đukić via GitGitGadget]

This is the first version of a patch series to start porting
git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
a head start:
https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u

Changes since v2:

 * fixed translation misuse and avoided command names translation in 
   add_i_show_help

Daniel Ferreira (4):
  diff: export diffstat interface
  add--helper: create builtin helper for interactive add
  add-interactive.c: implement status command
  add--interactive.perl: use add--helper --status for status_cmd

Slavica Djukic (3):
  add-interactive.c: implement show-help command
  t3701-add-interactive: test add_i_show_help()
  add--interactive.perl: use add--helper --show-help for help_cmd

 .gitignore                 |   1 +
 Makefile                   |   2 +
 add-interactive.c          | 263 +++++++++++++++++++++++++++++++++++++
 add-interactive.h          |  10 ++
 builtin.h                  |   1 +
 builtin/add--helper.c      |  43 ++++++
 diff.c                     |  36 ++---
 diff.h                     |  18 +++
 git-add--interactive.perl  |  15 +--
 git.c                      |   1 +
 t/t3701-add-interactive.sh |  24 ++++
 11 files changed, 379 insertions(+), 35 deletions(-)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h
 create mode 100644 builtin/add--helper.c


base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/103

Range-diff vs v2:

 1:  737767b6f4 = 1:  737767b6f4 diff: export diffstat interface
 2:  91b1963125 = 2:  91b1963125 add--helper: create builtin helper for interactive add
 3:  d247ef69fe = 3:  d247ef69fe add-interactive.c: implement status command
 4:  4950c889aa = 4:  4950c889aa add--interactive.perl: use add--helper --status for status_cmd
 5:  cf4e913a5a ! 5:  581b108c9c add-interactive.c: implement show-help command
     @@ -23,24 +23,18 @@
      +void add_i_show_help(void)
      +{
      +	const char *help_color = get_color(COLOR_HELP);
     -+	color_fprintf(stdout, help_color, "%s%s", _("status"), 
     -+		N_("        - show paths with changes"));
     -+	printf("\n");
     -+	color_fprintf(stdout, help_color, "%s%s", _("update"), 
     -+		N_("        - add working tree state to the staged set of changes"));
     -+	printf("\n");	
     -+	color_fprintf(stdout, help_color, "%s%s", _("revert"),
     -+		N_("        - revert staged set of changes back to the HEAD version"));
     -+	printf("\n");
     -+	color_fprintf(stdout, help_color, "%s%s", _("patch"),
     -+		N_("         - pick hunks and update selectively"));
     -+	printf("\n");
     -+	color_fprintf(stdout, help_color, "%s%s", _("diff"),
     -+		N_("          - view diff between HEAD and index"));
     -+	printf("\n");
     -+	color_fprintf(stdout, help_color, "%s%s", _("add untracked"),
     -+		N_(" - add contents of untracked files to the staged set of changes"));
     -+	printf("\n");
     ++	color_fprintf_ln(stdout, help_color, "status        - %s",
     ++			_("show paths with changes"));
     ++	color_fprintf_ln(stdout, help_color, "update        - %s",
     ++			_("add working tree state to the staged set of changes"));
     ++	color_fprintf_ln(stdout, help_color, "revert        - %s",
     ++			_("revert staged set of changes back to the HEAD version"));
     ++	color_fprintf_ln(stdout, help_color, "patch         - %s",
     ++			_("pick hunks and update selectively"));
     ++	color_fprintf_ln(stdout, help_color, "diff          - %s",
     ++			_("view diff between HEAD and index"));
     ++	color_fprintf_ln(stdout, help_color, "add untracked - %s",
     ++			_("add contents of untracked files to the staged set of changes"));
      +}
      
       diff --git a/add-interactive.h b/add-interactive.h
 6:  2b4714b8d0 = 6:  aede733318 t3701-add-interactive: test add_i_show_help()
 7:  6ede6d9251 = 7:  b9a1a7e37a add--interactive.perl: use add--helper --show-help for help_cmd

-- 
gitgitgadget

[PATCH v3 1/7] diff: export diffstat interface

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 diff.c | 36 ++++++++++++++----------------------
 diff.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/diff.c b/diff.c
index dc9965e836..46a7d8cf29 100644
--- a/diff.c
+++ b/diff.c
@@ -2421,22 +2421,6 @@ static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 	}
 }
 
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
 					  const char *name_a,
 					  const char *name_b)
@@ -5922,12 +5906,7 @@ void diff_flush(struct diff_options *options)
 	    dirstat_by_line) {
 		struct diffstat_t diffstat;
 
-		memset(&diffstat, 0, sizeof(struct diffstat_t));
-		for (i = 0; i < q->nr; i++) {
-			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p))
-				diff_flush_stat(p, options, &diffstat);
-		}
+		compute_diffstat(options, &diffstat);
 		if (output_format & DIFF_FORMAT_NUMSTAT)
 			show_numstat(&diffstat, options);
 		if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -6227,6 +6206,19 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 	return ignored;
 }
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
+{
+	int i;
+	struct diff_queue_struct *q = &diff_queued_diff;
+
+	memset(diffstat, 0, sizeof(struct diffstat_t));
+	for (i = 0; i < q->nr; i++) {
+		struct diff_filepair *p = q->queue[i];
+		if (check_pair_status(p))
+			diff_flush_stat(p, options, diffstat);
+	}
+}
+
 void diff_addremove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const struct object_id *oid,
diff --git a/diff.h b/diff.h
index ce5e8a8183..7809db3039 100644
--- a/diff.h
+++ b/diff.h
@@ -239,6 +239,22 @@ void diff_emit_submodule_error(struct diff_options *o, const char *err);
 void diff_emit_submodule_pipethrough(struct diff_options *o,
 				     const char *line, int len);
 
+struct diffstat_t {
+	int nr;
+	int alloc;
+	struct diffstat_file {
+		char *from_name;
+		char *name;
+		char *print_name;
+		const char *comments;
+		unsigned is_unmerged:1;
+		unsigned is_binary:1;
+		unsigned is_renamed:1;
+		unsigned is_interesting:1;
+		uintmax_t added, deleted;
+	} **files;
+};
+
 enum color_diff {
 	DIFF_RESET = 0,
 	DIFF_CONTEXT = 1,
@@ -327,6 +343,8 @@ void diff_change(struct diff_options *,
 
 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat);
+
 #define DIFF_SETUP_REVERSE      	1
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-- 
gitgitgadget

[PATCH v3 2/7] add--helper: create builtin helper for interactive add

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Create a builtin helper for git-add--interactive, which right now is not
able to do anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 0d77ea5894..2ee71ed217 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index 1a44c811aa..9c84b80739 100644
--- a/Makefile
+++ b/Makefile
@@ -1023,6 +1023,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..dd811ef7d5 100644
--- a/builtin.h
+++ b/builtin.h
@@ -128,6 +128,7 @@ extern void setup_auto_pager(const char *cmd, int def);
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000000..6a97f0e191
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 2f604a41ea..5507591f2e 100644
--- a/git.c
+++ b/git.c
@@ -443,6 +443,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
gitgitgadget

[PATCH v3 3/7] add-interactive.c: implement status command

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Add new files: add-interactive.c and add-interactive.h, which
will be used for implementing "application logic" of git add -i,
whereas add--helper.c will be used mostly for parsing the command line.
We're a bit lax with the command-line parsing, as the command is
intended to be called only by one internal user: the add--interactive script.

Implement add --interactive's status command in add-interactive.c and
use it in builtin add--helper.c.

It prints a numstat comparing changed files between a) the worktree and
the index; b) the index and the HEAD.

To do so, we use run_diff_index() and run_diff_files() to get changed
files, use the diffstat API on them to get the numstat and use a
combination of a hashmap and qsort() to print the result in
O(n) + O(n lg n) complexity.

This is the first interactive add command implemented in C of those
anticipated by the previous commit, which introduced
the add--helper built-in.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 Makefile              |   1 +
 add-interactive.c     | 246 ++++++++++++++++++++++++++++++++++++++++++
 add-interactive.h     |   8 ++
 builtin/add--helper.c |  32 ++++++
 4 files changed, 287 insertions(+)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h

diff --git a/Makefile b/Makefile
index 9c84b80739..2a4a5cc37b 100644
--- a/Makefile
+++ b/Makefile
@@ -827,6 +827,7 @@ LIB_H = $(shell $(FIND) . \
 	-name '*.h' -print)
 
 LIB_OBJS += abspath.o
+LIB_OBJS += add-interactive.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
diff --git a/add-interactive.c b/add-interactive.c
new file mode 100644
index 0000000000..c55d934186
--- /dev/null
+++ b/add-interactive.c
@@ -0,0 +1,246 @@
+#include "add-interactive.h"
+#include "cache.h"
+#include "commit.h"
+#include "color.h"
+#include "config.h"
+#include "diffcore.h"
+#include "revision.h"
+
+#define HEADER_INDENT "      "
+
+enum collection_phase {
+	WORKTREE,
+	INDEX
+};
+
+struct file_stat {
+	struct hashmap_entry ent;
+	struct {
+		uintmax_t added, deleted;
+	} index, worktree;
+	char name[FLEX_ARRAY];
+};
+
+struct collection_status {
+	enum collection_phase phase;
+
+	const char *reference;
+	struct pathspec pathspec;
+
+	struct hashmap file_map;
+};
+
+static int use_color = -1;
+enum color_add_i {
+	COLOR_PROMPT,
+	COLOR_HEADER,
+	COLOR_HELP,
+	COLOR_ERROR
+};
+
+static char colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_BOLD_BLUE, /* Prompt */
+	GIT_COLOR_BOLD,      /* Header */
+	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_BOLD_RED   /* Error */
+};
+
+static const char *get_color(enum color_add_i ix)
+{
+	if (want_color(use_color))
+		return colors[ix];
+	return "";
+}
+
+static int parse_color_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "prompt"))
+		return COLOR_PROMPT;
+	if (!strcasecmp(slot, "header"))
+		return COLOR_HEADER;
+	if (!strcasecmp(slot, "help"))
+		return COLOR_HELP;
+	if (!strcasecmp(slot, "error"))
+		return COLOR_ERROR;
+
+	return -1;
+}
+
+int add_i_config(const char *var,
+		const char *value, void *cbdata)
+{
+	const char *name;
+
+	if (!strcmp(var, "color.interactive")) {
+		use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+
+	if (skip_prefix(var, "color.interactive.", &name)) {
+		int slot = parse_color_slot(name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, colors[slot]);
+	}
+
+	return git_default_config(var, value, cbdata);
+}
+
+static int hash_cmp(const void *unused_cmp_data, const void *entry,
+			const void *entry_or_key, const void *keydata)
+{
+	const struct file_stat *e1 = entry, *e2 = entry_or_key;
+	const char *name = keydata ? keydata : e2->name;
+
+	return strcmp(e1->name, name);
+}
+
+static int alphabetical_cmp(const void *a, const void *b)
+{
+	struct file_stat *f1 = *((struct file_stat **)a);
+	struct file_stat *f2 = *((struct file_stat **)b);
+
+	return strcmp(f1->name, f2->name);
+}
+
+static void collect_changes_cb(struct diff_queue_struct *q,
+					 struct diff_options *options,
+					 void *data)
+{
+	struct collection_status *s = data;
+	struct diffstat_t stat = { 0 };
+	int i;
+
+	if (!q->nr)
+		return;
+
+	compute_diffstat(options, &stat);
+
+	for (i = 0; i < stat.nr; i++) {
+		struct file_stat *entry;
+		const char *name = stat.files[i]->name;
+		unsigned int hash = strhash(name);
+
+		entry = hashmap_get_from_hash(&s->file_map, hash, name);
+		if (!entry) {
+			FLEX_ALLOC_STR(entry, name, name);
+			hashmap_entry_init(entry, hash);
+			hashmap_add(&s->file_map, entry);
+		}
+
+		if (s->phase == WORKTREE) {
+			entry->worktree.added = stat.files[i]->added;
+			entry->worktree.deleted = stat.files[i]->deleted;
+		} else if (s->phase == INDEX) {
+			entry->index.added = stat.files[i]->added;
+			entry->index.deleted = stat.files[i]->deleted;
+		}
+	}
+}
+
+static void collect_changes_worktree(struct collection_status *s)
+{
+	struct rev_info rev;
+
+	s->phase = WORKTREE;
+
+	init_revisions(&rev, NULL);
+	setup_revisions(0, NULL, &rev, NULL);
+
+	rev.max_count = 0;
+
+	rev.diffopt.flags.ignore_dirty_submodules = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_files(&rev, 0);
+}
+
+static void collect_changes_index(struct collection_status *s)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt = { 0 };
+
+	s->phase = INDEX;
+
+	init_revisions(&rev, NULL);
+	opt.def = s->reference;
+	setup_revisions(0, NULL, &rev, &opt);
+
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_index(&rev, 1);
+}
+
+void add_i_print_modified(void)
+{
+	int i = 0;
+	struct collection_status s;
+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
+	const char *modified_fmt = _("%12s %12s %s");
+	const char *header_color = get_color(COLOR_HEADER);
+	struct object_id sha1;
+
+	struct hashmap_iter iter;
+	struct file_stat **files;
+	struct file_stat *entry;
+
+	if (read_cache() < 0)
+		return;
+
+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
+
+	collect_changes_worktree(&s);
+	collect_changes_index(&s);
+
+	if (hashmap_get_size(&s.file_map) < 1) {
+		printf("\n");
+		return;
+	}
+
+	printf(HEADER_INDENT);
+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
+			_("unstaged"), _("path"));
+	printf("\n");
+
+	hashmap_iter_init(&s.file_map, &iter);
+
+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
+	while ((entry = hashmap_iter_next(&iter))) {
+		files[i++] = entry;
+	}
+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
+
+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
+		struct file_stat *f = files[i];
+
+		char worktree_changes[50];
+		char index_changes[50];
+
+		if (f->worktree.added || f->worktree.deleted)
+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
+					f->worktree.deleted);
+		else
+			snprintf(worktree_changes, 50, "%s", _("nothing"));
+
+		if (f->index.added || f->index.deleted)
+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
+					f->index.deleted);
+		else
+			snprintf(index_changes, 50, "%s", _("unchanged"));
+
+		printf(" %2d: ", i + 1);
+		printf(modified_fmt, index_changes, worktree_changes, f->name);
+		printf("\n");
+	}
+	printf("\n");
+
+	free(files);
+	hashmap_free(&s.file_map, 1);
+}
diff --git a/add-interactive.h b/add-interactive.h
new file mode 100644
index 0000000000..1f4747553c
--- /dev/null
+++ b/add-interactive.h
@@ -0,0 +1,8 @@
+#ifndef ADD_INTERACTIVE_H
+#define ADD_INTERACTIVE_H
+
+int add_i_config(const char *var, const char *value, void *cbdata);
+
+void add_i_print_modified(void);
+
+#endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 6a97f0e191..43545d9af5 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -1,6 +1,38 @@
+#include "add-interactive.h"
 #include "builtin.h"
+#include "config.h"
+#include "revision.h"
+
+static const char * const builtin_add_helper_usage[] = {
+	N_("git add-interactive--helper <command>"),
+	NULL
+};
+
+enum cmd_mode {
+	DEFAULT = 0,
+	STATUS
+};
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
 {
+	enum cmd_mode mode = DEFAULT;
+
+	struct option options[] = {
+		OPT_CMDMODE(0, "status", &mode,
+			 N_("print status information with diffstat"), STATUS),
+		OPT_END()
+	};
+
+	git_config(add_i_config, NULL);
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_add_helper_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (mode == STATUS)
+		add_i_print_modified();
+	else
+		usage_with_options(builtin_add_helper_usage,
+				   options);
+
 	return 0;
 }
-- 
gitgitgadget

[PATCH v3 4/7] add--interactive.perl: use add--helper --status for status_cmd

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Call the newly introduced add--helper builtin on
status_cmd() instead of relying on add--interactive's Perl
functions to build print the numstat.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..a6536f9cf3 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -597,9 +597,7 @@ sub prompt_help_cmd {
 }
 
 sub status_cmd {
-	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
-			list_modified());
-	print "\n";
+	system(qw(git add--helper --status));
 }
 
 sub say_n_paths {
-- 
gitgitgadget

[PATCH v3 5/7] add-interactive.c: implement show-help command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 17 +++++++++++++++++
 add-interactive.h     |  4 +++-
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/add-interactive.c b/add-interactive.c
index c55d934186..d239037bc1 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -244,3 +244,20 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void add_i_show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "status        - %s",
+			_("show paths with changes"));
+	color_fprintf_ln(stdout, help_color, "update        - %s",
+			_("add working tree state to the staged set of changes"));
+	color_fprintf_ln(stdout, help_color, "revert        - %s",
+			_("revert staged set of changes back to the HEAD version"));
+	color_fprintf_ln(stdout, help_color, "patch         - %s",
+			_("pick hunks and update selectively"));
+	color_fprintf_ln(stdout, help_color, "diff          - %s",
+			_("view diff between HEAD and index"));
+	color_fprintf_ln(stdout, help_color, "add untracked - %s",
+			_("add contents of untracked files to the staged set of changes"));
+}
diff --git a/add-interactive.h b/add-interactive.h
index 1f4747553c..46e17c5c71 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_print_modified(void);
 
-#endif
\ No newline at end of file
+void add_i_show_help(void);
+
+#endif
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 43545d9af5..a3b3a68b68 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			 N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			 N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_print_modified();
+	else if (mode == HELP)
+		add_i_show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
gitgitgadget

[PATCH v3 6/7] t3701-add-interactive: test add_i_show_help()

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Add test to t3701-add-interactive to verify that add_i_show_help()
outputs expected content.
Also, add it before changing git-add--interactive.perl's help_cmd
to demonstrate that there are no changes introduced by the
conversion to C.
Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
to force colored output on Windows.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 65dfbc033a..14e3286995 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'show help from add--helper' '
+	git reset --hard &&
+	cat >expect <<-\EOF &&
+
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
+	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
+	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
+	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
+	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
+	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> 
+	Bye.
+	EOF
+	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
+	test_decode_color <actual.colored >actual &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
gitgitgadget

[PATCH v3 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 git-add--interactive.perl | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index a6536f9cf3..32ee729a58 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1717,16 +1717,7 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	system(qw(git add--helper --show-help));
 }
 
 sub process_args {
-- 
gitgitgadget

Re: [PATCH v3 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Ævar Arnfjörð Bjarmason]

On Mon, Jan 21 2019, Slavica Djukic via GitGitGadget wrote:

> From: Slavica Djukic <slawica92@hotmail.com>
>
> Change help_cmd sub in git-add--interactive.perl to use
> show-help command from builtin add--helper.
>
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  git-add--interactive.perl | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/git-add--interactive.perl b/git-add--interactive.perl
> index a6536f9cf3..32ee729a58 100755
> --- a/git-add--interactive.perl
> +++ b/git-add--interactive.perl
> @@ -1717,16 +1717,7 @@ sub quit_cmd {
>  }
>
>  sub help_cmd {
> -# TRANSLATORS: please do not translate the command names
> -# 'status', 'update', 'revert', etc.
> -	print colored $help_color, __ <<'EOF' ;
> -status        - show paths with changes
> -update        - add working tree state to the staged set of changes
> -revert        - revert staged set of changes back to the HEAD version
> -patch         - pick hunks and update selectively
> -diff          - view diff between HEAD and index
> -add untracked - add contents of untracked files to the staged set of changes
> -EOF
> +	system(qw(git add--helper --show-help));
>  }
>
>  sub process_args {

Both this and an earlier change in this series replaces a callback
command with an invocation of system() without any error checking. So if
this add-helper fails for whatever reason we'll silently fail to report
it.

I think it makes sense to put something like the following WIP code
earlier in the series. Then if the command was e.g. ["false", "git",
"status"] we'd see:

    What now> s
    oh noes when running 'false git status': returned error '1'

WIP patch. Obviously not ready as-is, but feel free to consider this to
have my SOB & adapt it.

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..1cd5f8122b 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1777,7 +1777,7 @@ sub process_args {
 }

 sub main_loop {
-	my @cmd = ([ 'status', \&status_cmd, ],
+	my @cmd = ([ 'status', ["git", "status"] ],
 		   [ 'update', \&update_cmd, ],
 		   [ 'revert', \&revert_cmd, ],
 		   [ 'add untracked', \&add_untracked_cmd, ],
@@ -1794,11 +1794,23 @@ sub main_loop {
 					     ON_EOF => \&quit_cmd,
 					     IMMEDIATE => 1 }, @cmd);
 		if ($it) {
-			eval {
-				$it->[1]->();
-			};
-			if ($@) {
-				print "$@";
+			my $cb = $it->[1];
+			if (ref $cb eq 'CODE') {
+				eval {
+					$cb->();
+					1;
+				} or do {
+					print "$@";
+				};
+			} else {
+				if (system(@$cb) != 0) {
+					if ($? == -1 || $? & 127) {
+						print STDERR "oh noes when running '@$cb': unexpected '$?'\n";
+					} else {
+						my $ret = $? >> 8;
+						print STDERR "oh noes when running '@$cb': returned error '$ret'\n";
+					}
+				}
 			}
 		}
 	}

Re: [PATCH v3 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic]

Hello Ævar,

thanks for taking time and making review.

On 21-Jan-19 10:59 AM, Ævar Arnfjörð Bjarmason wrote:
> On Mon, Jan 21 2019, Slavica Djukic via GitGitGadget wrote:
>
>> From: Slavica Djukic <slawica92@hotmail.com>
>>
>> Change help_cmd sub in git-add--interactive.perl to use
>> show-help command from builtin add--helper.
>>
>> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>> ---
>>   git-add--interactive.perl | 11 +----------
>>   1 file changed, 1 insertion(+), 10 deletions(-)
>>
>> diff --git a/git-add--interactive.perl b/git-add--interactive.perl
>> index a6536f9cf3..32ee729a58 100755
>> --- a/git-add--interactive.perl
>> +++ b/git-add--interactive.perl
>> @@ -1717,16 +1717,7 @@ sub quit_cmd {
>>   }
>>
>>   sub help_cmd {
>> -# TRANSLATORS: please do not translate the command names
>> -# 'status', 'update', 'revert', etc.
>> -	print colored $help_color, __ <<'EOF' ;
>> -status        - show paths with changes
>> -update        - add working tree state to the staged set of changes
>> -revert        - revert staged set of changes back to the HEAD version
>> -patch         - pick hunks and update selectively
>> -diff          - view diff between HEAD and index
>> -add untracked - add contents of untracked files to the staged set of changes
>> -EOF
>> +	system(qw(git add--helper --show-help));
>>   }
>>
>>   sub process_args {
> Both this and an earlier change in this series replaces a callback
> command with an invocation of system() without any error checking. So if
> this add-helper fails for whatever reason we'll silently fail to report
> it.
>
> I think it makes sense to put something like the following WIP code
> earlier in the series. Then if the command was e.g. ["false", "git",
> "status"] we'd see:
>
>      What now> s
>      oh noes when running 'false git status': returned error '1'
>
> WIP patch. Obviously not ready as-is, but feel free to consider this to
> have my SOB & adapt it.


And thank you for writing up this WIP patch.  I will adapt it and have 
your SOB.

-Slavica


>
> diff --git a/git-add--interactive.perl b/git-add--interactive.perl
> index 20eb81cc92..1cd5f8122b 100755
> --- a/git-add--interactive.perl
> +++ b/git-add--interactive.perl
> @@ -1777,7 +1777,7 @@ sub process_args {
>   }
>
>   sub main_loop {
> -	my @cmd = ([ 'status', \&status_cmd, ],
> +	my @cmd = ([ 'status', ["git", "status"] ],
>   		   [ 'update', \&update_cmd, ],
>   		   [ 'revert', \&revert_cmd, ],
>   		   [ 'add untracked', \&add_untracked_cmd, ],
> @@ -1794,11 +1794,23 @@ sub main_loop {
>   					     ON_EOF => \&quit_cmd,
>   					     IMMEDIATE => 1 }, @cmd);
>   		if ($it) {
> -			eval {
> -				$it->[1]->();
> -			};
> -			if ($@) {
> -				print "$@";
> +			my $cb = $it->[1];
> +			if (ref $cb eq 'CODE') {
> +				eval {
> +					$cb->();
> +					1;
> +				} or do {
> +					print "$@";
> +				};
> +			} else {
> +				if (system(@$cb) != 0) {
> +					if ($? == -1 || $? & 127) {
> +						print STDERR "oh noes when running '@$cb': unexpected '$?'\n";
> +					} else {
> +						my $ret = $? >> 8;
> +						print STDERR "oh noes when running '@$cb': returned error '$ret'\n";
> +					}
> +				}
>   			}
>   		}
>   	}
>

Re: [PATCH v3 6/7] t3701-add-interactive: test add_i_show_help()

[Phillip Wood]

Hi Slavica

Having suggested that you move this patch up the series, I thought I
should check that it does actually pass before the rewrite.
Unfortunately when I run it it fails, but it is due to a missing
trailing space in the expected file. I get

--- expect	2019-01-25 10:42:06.794251740 +0000
+++ actual	2019-01-25 10:42:07.044127788 +0000
@@ -11,5 +11,5 @@
 <BOLD>*** Commands ***<RESET>
   1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3:
<BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
   5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7:
<BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
-<BOLD;BLUE>What now<RESET>>
+<BOLD;BLUE>What now<RESET>>
 Bye.

There should be a space after '<BOLD;BLUE>What now<RESET>>' as the
prompt has a space after it. The space is actually in the patch but it
got eaten by 'git am' (I have core.whitespace set but I think cleaning
up trailing whitespace is on by default anyway). I think the best way to
make this patch easier to apply would be to use '$SP' which is already
set up in earlier tests to avoid trailing whitespace in here documents.
You'll need to change
cat >expect <<-\EOF
to
cat >expect <<-EOF
to enable variable interpolation in the here document as well.

Best Wishes

Phillip


On 21/01/2019 09:13, Slavica Djukic via GitGitGadget wrote:
> From: Slavica Djukic <slawica92@hotmail.com>
> 
> Add test to t3701-add-interactive to verify that add_i_show_help()
> outputs expected content.
> Also, add it before changing git-add--interactive.perl's help_cmd
> to demonstrate that there are no changes introduced by the
> conversion to C.
> Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
> to force colored output on Windows.
> 
> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
> ---
>  t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
> index 65dfbc033a..14e3286995 100755
> --- a/t/t3701-add-interactive.sh
> +++ b/t/t3701-add-interactive.sh
> @@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
>  	test_cmp expected-2 actual
>  '
>  
> +test_expect_success 'show help from add--helper' '
> +	git reset --hard &&
> +	cat >expect <<-\EOF &&
> +
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
> +	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
> +	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
> +	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
> +	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
> +	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
> +	<BOLD>*** Commands ***<RESET>
> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> +	<BOLD;BLUE>What now<RESET>> 
> +	Bye.
> +	EOF
> +	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
> +	test_decode_color <actual.colored >actual &&
> +	test_i18ncmp expect actual
> +'
> +
>  test_done
> 

Re: [PATCH v3 6/7] t3701-add-interactive: test add_i_show_help()

[Slavica Djukic]

Hi Phillip,

On 25-Jan-19 12:01 PM, Phillip Wood wrote:
> Hi Slavica
>
> Having suggested that you move this patch up the series, I thought I
> should check that it does actually pass before the rewrite.
> Unfortunately when I run it it fails, but it is due to a missing
> trailing space in the expected file. I get
>
> --- expect	2019-01-25 10:42:06.794251740 +0000
> +++ actual	2019-01-25 10:42:07.044127788 +0000
> @@ -11,5 +11,5 @@
>   <BOLD>*** Commands ***<RESET>
>     1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3:
> <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
>     5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7:
> <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
> -<BOLD;BLUE>What now<RESET>>
> +<BOLD;BLUE>What now<RESET>>
>   Bye.
>
> There should be a space after '<BOLD;BLUE>What now<RESET>>' as the
> prompt has a space after it. The space is actually in the patch but it
> got eaten by 'git am' (I have core.whitespace set but I think cleaning
> up trailing whitespace is on by default anyway). I think the best way to
> make this patch easier to apply would be to use '$SP' which is already
> set up in earlier tests to avoid trailing whitespace in here documents.
> You'll need to change
> cat >expect <<-\EOF
> to
> cat >expect <<-EOF
> to enable variable interpolation in the here document as well.


Thanks for checking the test. I had no idea that this might happen.

I'll send new iteration soon, along with this changes.


-Slavica


>
> Best Wishes
>
> Phillip
>
>
> On 21/01/2019 09:13, Slavica Djukic via GitGitGadget wrote:
>> From: Slavica Djukic <slawica92@hotmail.com>
>>
>> Add test to t3701-add-interactive to verify that add_i_show_help()
>> outputs expected content.
>> Also, add it before changing git-add--interactive.perl's help_cmd
>> to demonstrate that there are no changes introduced by the
>> conversion to C.
>> Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
>> to force colored output on Windows.
>>
>> Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>> ---
>>   t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
>>   1 file changed, 24 insertions(+)
>>
>> diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
>> index 65dfbc033a..14e3286995 100755
>> --- a/t/t3701-add-interactive.sh
>> +++ b/t/t3701-add-interactive.sh
>> @@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
>>   	test_cmp expected-2 actual
>>   '
>>   
>> +test_expect_success 'show help from add--helper' '
>> +	git reset --hard &&
>> +	cat >expect <<-\EOF &&
>> +
>> +	<BOLD>*** Commands ***<RESET>
>> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
>> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
>> +	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
>> +	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
>> +	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
>> +	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
>> +	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
>> +	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
>> +	<BOLD>*** Commands ***<RESET>
>> +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
>> +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
>> +	<BOLD;BLUE>What now<RESET>>
>> +	Bye.
>> +	EOF
>> +	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
>> +	test_decode_color <actual.colored >actual &&
>> +	test_i18ncmp expect actual
>> +'
>> +
>>   test_done
>>

[PATCH v4 0/7] Turn git add-i into built-in

[Slavica Đukić via GitGitGadget]

This is the first version of a patch series to start porting
git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
a head start:
https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u

Changes since v3:

 * add error check when calling add--helper's functions from
   git-add--interactive.perl
 * replace trailing whitespace in the test with variable $SP used in earlier
   tests

Cc: Phillip Wood phillip.wood@dunelm.org.uk [phillip.wood@dunelm.org.uk]

Daniel Ferreira (4):
  diff: export diffstat interface
  add--helper: create builtin helper for interactive add
  add-interactive.c: implement status command
  add--interactive.perl: use add--helper --status for status_cmd

Slavica Djukic (3):
  add-interactive.c: implement show-help command
  t3701-add-interactive: test add_i_show_help()
  add--interactive.perl: use add--helper --show-help for help_cmd

 .gitignore                 |   1 +
 Makefile                   |   2 +
 add-interactive.c          | 263 +++++++++++++++++++++++++++++++++++++
 add-interactive.h          |  10 ++
 builtin.h                  |   1 +
 builtin/add--helper.c      |  43 ++++++
 diff.c                     |  36 ++---
 diff.h                     |  18 +++
 git-add--interactive.perl  |  17 +--
 git.c                      |   1 +
 t/t3701-add-interactive.sh |  24 ++++
 11 files changed, 381 insertions(+), 35 deletions(-)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h
 create mode 100644 builtin/add--helper.c


base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v4
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v4
Pull-Request: https://github.com/gitgitgadget/git/pull/103

Range-diff vs v3:

 1:  737767b6f4 = 1:  737767b6f4 diff: export diffstat interface
 2:  91b1963125 = 2:  91b1963125 add--helper: create builtin helper for interactive add
 3:  d247ef69fe = 3:  d247ef69fe add-interactive.c: implement status command
 4:  4950c889aa ! 4:  fb3f9378ac add--interactive.perl: use add--helper --status for status_cmd
     @@ -2,12 +2,21 @@
      
          add--interactive.perl: use add--helper --status for status_cmd
      
     -    Call the newly introduced add--helper builtin on
     +    Call the newly introduced add--helper builtin in
          status_cmd() instead of relying on add--interactive's Perl
     -    functions to build print the numstat.
     +    functions to print the numstat.
     +
     +    If an error occurs, it will be reported, but the Perl script will
     +    not exit, since the add--helper is called within an eval block.
     +
     +    As the Perl script will go away soon, so will this scenario, where
     +    the built-in helper is called  from the Perl script. Combined with
     +    the fact that it would be hard to test, we'll pass on adding
     +    a regression test for this.
      
          Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
     +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
      
       diff --git a/git-add--interactive.perl b/git-add--interactive.perl
       --- a/git-add--interactive.perl
     @@ -19,7 +28,8 @@
      -	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
      -			list_modified());
      -	print "\n";
     -+	system(qw(git add--helper --status));
     ++	my @status_cmd = ("git", "add--helper", "--status");
     ++	!system(@status_cmd) or die "@status_cmd exited with code $?";
       }
       
       sub say_n_paths {
 5:  581b108c9c = 5:  ab16afd1d5 add-interactive.c: implement show-help command
 6:  aede733318 ! 6:  0a27304a84 t3701-add-interactive: test add_i_show_help()
     @@ -7,6 +7,7 @@
          Also, add it before changing git-add--interactive.perl's help_cmd
          to demonstrate that there are no changes introduced by the
          conversion to C.
     +
          Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
          to force colored output on Windows.
      
     @@ -21,7 +22,7 @@
       
      +test_expect_success 'show help from add--helper' '
      +	git reset --hard &&
     -+	cat >expect <<-\EOF &&
     ++	cat >expect <<-EOF &&
      +
      +	<BOLD>*** Commands ***<RESET>
      +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
     @@ -35,7 +36,7 @@
      +	<BOLD>*** Commands ***<RESET>
      +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
      +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
     -+	<BOLD;BLUE>What now<RESET>> 
     ++	<BOLD;BLUE>What now<RESET>>$SP
      +	Bye.
      +	EOF
      +	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
 7:  b9a1a7e37a ! 7:  ca2a7c4375 add--interactive.perl: use add--helper --show-help for help_cmd
     @@ -5,7 +5,15 @@
          Change help_cmd sub in git-add--interactive.perl to use
          show-help command from builtin add--helper.
      
     +    If an error occurs, it will be reported, but the Perl script will
     +    not exit, since the add--helper is called within an eval block.
     +
     +    Just like the change where the Perl script calls the add--helper
     +    to print the numstat, also here we forgo adding a regression test:
     +    the Perl script is on its way out (and this patch is part of that journey).
     +
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
     +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
      
       diff --git a/git-add--interactive.perl b/git-add--interactive.perl
       --- a/git-add--interactive.perl
     @@ -24,7 +32,8 @@
      -diff          - view diff between HEAD and index
      -add untracked - add contents of untracked files to the staged set of changes
      -EOF
     -+	system(qw(git add--helper --show-help));
     ++	my @help_cmd = ("git", "add--helper", "--show-help");
     ++	!system(@help_cmd) or die "@help_cmd exited with code $?";
       }
       
       sub process_args {

-- 
gitgitgadget

[PATCH v4 1/7] diff: export diffstat interface

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 diff.c | 36 ++++++++++++++----------------------
 diff.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/diff.c b/diff.c
index dc9965e836..46a7d8cf29 100644
--- a/diff.c
+++ b/diff.c
@@ -2421,22 +2421,6 @@ static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 	}
 }
 
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
 					  const char *name_a,
 					  const char *name_b)
@@ -5922,12 +5906,7 @@ void diff_flush(struct diff_options *options)
 	    dirstat_by_line) {
 		struct diffstat_t diffstat;
 
-		memset(&diffstat, 0, sizeof(struct diffstat_t));
-		for (i = 0; i < q->nr; i++) {
-			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p))
-				diff_flush_stat(p, options, &diffstat);
-		}
+		compute_diffstat(options, &diffstat);
 		if (output_format & DIFF_FORMAT_NUMSTAT)
 			show_numstat(&diffstat, options);
 		if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -6227,6 +6206,19 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 	return ignored;
 }
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
+{
+	int i;
+	struct diff_queue_struct *q = &diff_queued_diff;
+
+	memset(diffstat, 0, sizeof(struct diffstat_t));
+	for (i = 0; i < q->nr; i++) {
+		struct diff_filepair *p = q->queue[i];
+		if (check_pair_status(p))
+			diff_flush_stat(p, options, diffstat);
+	}
+}
+
 void diff_addremove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const struct object_id *oid,
diff --git a/diff.h b/diff.h
index ce5e8a8183..7809db3039 100644
--- a/diff.h
+++ b/diff.h
@@ -239,6 +239,22 @@ void diff_emit_submodule_error(struct diff_options *o, const char *err);
 void diff_emit_submodule_pipethrough(struct diff_options *o,
 				     const char *line, int len);
 
+struct diffstat_t {
+	int nr;
+	int alloc;
+	struct diffstat_file {
+		char *from_name;
+		char *name;
+		char *print_name;
+		const char *comments;
+		unsigned is_unmerged:1;
+		unsigned is_binary:1;
+		unsigned is_renamed:1;
+		unsigned is_interesting:1;
+		uintmax_t added, deleted;
+	} **files;
+};
+
 enum color_diff {
 	DIFF_RESET = 0,
 	DIFF_CONTEXT = 1,
@@ -327,6 +343,8 @@ void diff_change(struct diff_options *,
 
 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat);
+
 #define DIFF_SETUP_REVERSE      	1
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-- 
gitgitgadget

[PATCH v4 2/7] add--helper: create builtin helper for interactive add

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Create a builtin helper for git-add--interactive, which right now is not
able to do anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 0d77ea5894..2ee71ed217 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index 1a44c811aa..9c84b80739 100644
--- a/Makefile
+++ b/Makefile
@@ -1023,6 +1023,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..dd811ef7d5 100644
--- a/builtin.h
+++ b/builtin.h
@@ -128,6 +128,7 @@ extern void setup_auto_pager(const char *cmd, int def);
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000000..6a97f0e191
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 2f604a41ea..5507591f2e 100644
--- a/git.c
+++ b/git.c
@@ -443,6 +443,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
gitgitgadget

[PATCH v4 3/7] add-interactive.c: implement status command

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Add new files: add-interactive.c and add-interactive.h, which
will be used for implementing "application logic" of git add -i,
whereas add--helper.c will be used mostly for parsing the command line.
We're a bit lax with the command-line parsing, as the command is
intended to be called only by one internal user: the add--interactive script.

Implement add --interactive's status command in add-interactive.c and
use it in builtin add--helper.c.

It prints a numstat comparing changed files between a) the worktree and
the index; b) the index and the HEAD.

To do so, we use run_diff_index() and run_diff_files() to get changed
files, use the diffstat API on them to get the numstat and use a
combination of a hashmap and qsort() to print the result in
O(n) + O(n lg n) complexity.

This is the first interactive add command implemented in C of those
anticipated by the previous commit, which introduced
the add--helper built-in.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 Makefile              |   1 +
 add-interactive.c     | 246 ++++++++++++++++++++++++++++++++++++++++++
 add-interactive.h     |   8 ++
 builtin/add--helper.c |  32 ++++++
 4 files changed, 287 insertions(+)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h

diff --git a/Makefile b/Makefile
index 9c84b80739..2a4a5cc37b 100644
--- a/Makefile
+++ b/Makefile
@@ -827,6 +827,7 @@ LIB_H = $(shell $(FIND) . \
 	-name '*.h' -print)
 
 LIB_OBJS += abspath.o
+LIB_OBJS += add-interactive.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
diff --git a/add-interactive.c b/add-interactive.c
new file mode 100644
index 0000000000..c55d934186
--- /dev/null
+++ b/add-interactive.c
@@ -0,0 +1,246 @@
+#include "add-interactive.h"
+#include "cache.h"
+#include "commit.h"
+#include "color.h"
+#include "config.h"
+#include "diffcore.h"
+#include "revision.h"
+
+#define HEADER_INDENT "      "
+
+enum collection_phase {
+	WORKTREE,
+	INDEX
+};
+
+struct file_stat {
+	struct hashmap_entry ent;
+	struct {
+		uintmax_t added, deleted;
+	} index, worktree;
+	char name[FLEX_ARRAY];
+};
+
+struct collection_status {
+	enum collection_phase phase;
+
+	const char *reference;
+	struct pathspec pathspec;
+
+	struct hashmap file_map;
+};
+
+static int use_color = -1;
+enum color_add_i {
+	COLOR_PROMPT,
+	COLOR_HEADER,
+	COLOR_HELP,
+	COLOR_ERROR
+};
+
+static char colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_BOLD_BLUE, /* Prompt */
+	GIT_COLOR_BOLD,      /* Header */
+	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_BOLD_RED   /* Error */
+};
+
+static const char *get_color(enum color_add_i ix)
+{
+	if (want_color(use_color))
+		return colors[ix];
+	return "";
+}
+
+static int parse_color_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "prompt"))
+		return COLOR_PROMPT;
+	if (!strcasecmp(slot, "header"))
+		return COLOR_HEADER;
+	if (!strcasecmp(slot, "help"))
+		return COLOR_HELP;
+	if (!strcasecmp(slot, "error"))
+		return COLOR_ERROR;
+
+	return -1;
+}
+
+int add_i_config(const char *var,
+		const char *value, void *cbdata)
+{
+	const char *name;
+
+	if (!strcmp(var, "color.interactive")) {
+		use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+
+	if (skip_prefix(var, "color.interactive.", &name)) {
+		int slot = parse_color_slot(name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, colors[slot]);
+	}
+
+	return git_default_config(var, value, cbdata);
+}
+
+static int hash_cmp(const void *unused_cmp_data, const void *entry,
+			const void *entry_or_key, const void *keydata)
+{
+	const struct file_stat *e1 = entry, *e2 = entry_or_key;
+	const char *name = keydata ? keydata : e2->name;
+
+	return strcmp(e1->name, name);
+}
+
+static int alphabetical_cmp(const void *a, const void *b)
+{
+	struct file_stat *f1 = *((struct file_stat **)a);
+	struct file_stat *f2 = *((struct file_stat **)b);
+
+	return strcmp(f1->name, f2->name);
+}
+
+static void collect_changes_cb(struct diff_queue_struct *q,
+					 struct diff_options *options,
+					 void *data)
+{
+	struct collection_status *s = data;
+	struct diffstat_t stat = { 0 };
+	int i;
+
+	if (!q->nr)
+		return;
+
+	compute_diffstat(options, &stat);
+
+	for (i = 0; i < stat.nr; i++) {
+		struct file_stat *entry;
+		const char *name = stat.files[i]->name;
+		unsigned int hash = strhash(name);
+
+		entry = hashmap_get_from_hash(&s->file_map, hash, name);
+		if (!entry) {
+			FLEX_ALLOC_STR(entry, name, name);
+			hashmap_entry_init(entry, hash);
+			hashmap_add(&s->file_map, entry);
+		}
+
+		if (s->phase == WORKTREE) {
+			entry->worktree.added = stat.files[i]->added;
+			entry->worktree.deleted = stat.files[i]->deleted;
+		} else if (s->phase == INDEX) {
+			entry->index.added = stat.files[i]->added;
+			entry->index.deleted = stat.files[i]->deleted;
+		}
+	}
+}
+
+static void collect_changes_worktree(struct collection_status *s)
+{
+	struct rev_info rev;
+
+	s->phase = WORKTREE;
+
+	init_revisions(&rev, NULL);
+	setup_revisions(0, NULL, &rev, NULL);
+
+	rev.max_count = 0;
+
+	rev.diffopt.flags.ignore_dirty_submodules = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_files(&rev, 0);
+}
+
+static void collect_changes_index(struct collection_status *s)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt = { 0 };
+
+	s->phase = INDEX;
+
+	init_revisions(&rev, NULL);
+	opt.def = s->reference;
+	setup_revisions(0, NULL, &rev, &opt);
+
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_index(&rev, 1);
+}
+
+void add_i_print_modified(void)
+{
+	int i = 0;
+	struct collection_status s;
+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
+	const char *modified_fmt = _("%12s %12s %s");
+	const char *header_color = get_color(COLOR_HEADER);
+	struct object_id sha1;
+
+	struct hashmap_iter iter;
+	struct file_stat **files;
+	struct file_stat *entry;
+
+	if (read_cache() < 0)
+		return;
+
+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
+
+	collect_changes_worktree(&s);
+	collect_changes_index(&s);
+
+	if (hashmap_get_size(&s.file_map) < 1) {
+		printf("\n");
+		return;
+	}
+
+	printf(HEADER_INDENT);
+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
+			_("unstaged"), _("path"));
+	printf("\n");
+
+	hashmap_iter_init(&s.file_map, &iter);
+
+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
+	while ((entry = hashmap_iter_next(&iter))) {
+		files[i++] = entry;
+	}
+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
+
+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
+		struct file_stat *f = files[i];
+
+		char worktree_changes[50];
+		char index_changes[50];
+
+		if (f->worktree.added || f->worktree.deleted)
+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
+					f->worktree.deleted);
+		else
+			snprintf(worktree_changes, 50, "%s", _("nothing"));
+
+		if (f->index.added || f->index.deleted)
+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
+					f->index.deleted);
+		else
+			snprintf(index_changes, 50, "%s", _("unchanged"));
+
+		printf(" %2d: ", i + 1);
+		printf(modified_fmt, index_changes, worktree_changes, f->name);
+		printf("\n");
+	}
+	printf("\n");
+
+	free(files);
+	hashmap_free(&s.file_map, 1);
+}
diff --git a/add-interactive.h b/add-interactive.h
new file mode 100644
index 0000000000..1f4747553c
--- /dev/null
+++ b/add-interactive.h
@@ -0,0 +1,8 @@
+#ifndef ADD_INTERACTIVE_H
+#define ADD_INTERACTIVE_H
+
+int add_i_config(const char *var, const char *value, void *cbdata);
+
+void add_i_print_modified(void);
+
+#endif
\ No newline at end of file
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 6a97f0e191..43545d9af5 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -1,6 +1,38 @@
+#include "add-interactive.h"
 #include "builtin.h"
+#include "config.h"
+#include "revision.h"
+
+static const char * const builtin_add_helper_usage[] = {
+	N_("git add-interactive--helper <command>"),
+	NULL
+};
+
+enum cmd_mode {
+	DEFAULT = 0,
+	STATUS
+};
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
 {
+	enum cmd_mode mode = DEFAULT;
+
+	struct option options[] = {
+		OPT_CMDMODE(0, "status", &mode,
+			 N_("print status information with diffstat"), STATUS),
+		OPT_END()
+	};
+
+	git_config(add_i_config, NULL);
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_add_helper_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (mode == STATUS)
+		add_i_print_modified();
+	else
+		usage_with_options(builtin_add_helper_usage,
+				   options);
+
 	return 0;
 }
-- 
gitgitgadget

[PATCH v4 4/7] add--interactive.perl: use add--helper --status for status_cmd

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Call the newly introduced add--helper builtin in
status_cmd() instead of relying on add--interactive's Perl
functions to print the numstat.

If an error occurs, it will be reported, but the Perl script will
not exit, since the add--helper is called within an eval block.

As the Perl script will go away soon, so will this scenario, where
the built-in helper is called  from the Perl script. Combined with
the fact that it would be hard to test, we'll pass on adding
a regression test for this.

Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 git-add--interactive.perl | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..c2c6b4d5e3 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -597,9 +597,8 @@ sub prompt_help_cmd {
 }
 
 sub status_cmd {
-	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
-			list_modified());
-	print "\n";
+	my @status_cmd = ("git", "add--helper", "--status");
+	!system(@status_cmd) or die "@status_cmd exited with code $?";
 }
 
 sub say_n_paths {
-- 
gitgitgadget

[PATCH v4 6/7] t3701-add-interactive: test add_i_show_help()

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Add test to t3701-add-interactive to verify that add_i_show_help()
outputs expected content.
Also, add it before changing git-add--interactive.perl's help_cmd
to demonstrate that there are no changes introduced by the
conversion to C.

Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
to force colored output on Windows.

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 65dfbc033a..91aaef2932 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'show help from add--helper' '
+	git reset --hard &&
+	cat >expect <<-EOF &&
+
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
+	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
+	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
+	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
+	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
+	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>>$SP
+	Bye.
+	EOF
+	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
+	test_decode_color <actual.colored >actual &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
gitgitgadget

[PATCH v4 5/7] add-interactive.c: implement show-help command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 17 +++++++++++++++++
 add-interactive.h     |  4 +++-
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/add-interactive.c b/add-interactive.c
index c55d934186..d239037bc1 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -244,3 +244,20 @@ void add_i_print_modified(void)
 	free(files);
 	hashmap_free(&s.file_map, 1);
 }
+
+void add_i_show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "status        - %s",
+			_("show paths with changes"));
+	color_fprintf_ln(stdout, help_color, "update        - %s",
+			_("add working tree state to the staged set of changes"));
+	color_fprintf_ln(stdout, help_color, "revert        - %s",
+			_("revert staged set of changes back to the HEAD version"));
+	color_fprintf_ln(stdout, help_color, "patch         - %s",
+			_("pick hunks and update selectively"));
+	color_fprintf_ln(stdout, help_color, "diff          - %s",
+			_("view diff between HEAD and index"));
+	color_fprintf_ln(stdout, help_color, "add untracked - %s",
+			_("add contents of untracked files to the staged set of changes"));
+}
diff --git a/add-interactive.h b/add-interactive.h
index 1f4747553c..46e17c5c71 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_print_modified(void);
 
-#endif
\ No newline at end of file
+void add_i_show_help(void);
+
+#endif
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 43545d9af5..a3b3a68b68 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			 N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			 N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_print_modified();
+	else if (mode == HELP)
+		add_i_show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
gitgitgadget

[PATCH v4 7/7] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

If an error occurs, it will be reported, but the Perl script will
not exit, since the add--helper is called within an eval block.

Just like the change where the Perl script calls the add--helper
to print the numstat, also here we forgo adding a regression test:
the Perl script is on its way out (and this patch is part of that journey).

Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 git-add--interactive.perl | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index c2c6b4d5e3..88b7be6602 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1718,16 +1718,8 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	my @help_cmd = ("git", "add--helper", "--show-help");
+	!system(@help_cmd) or die "@help_cmd exited with code $?";
 }
 
 sub process_args {
-- 
gitgitgadget

Re: [PATCH v4 0/7] Turn git add-i into built-in

[Slavica Djukic]

Hi Phillip,

Sorry for omitting you in Cc, again.
I accidentally wrote yours and Ævar's email prefixed with Cc:, rather 
then separating
them with comma, like Johannes said I should.

-Slavica

On 25-Jan-19 1:23 PM, Slavica Đukić via GitGitGadget wrote:
> This is the first version of a patch series to start porting
> git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
> a head start:
> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u
>
> Changes since v3:
>
>   * add error check when calling add--helper's functions from
>     git-add--interactive.perl
>   * replace trailing whitespace in the test with variable $SP used in earlier
>     tests
>
> Cc: Phillip Wood phillip.wood@dunelm.org.uk [phillip.wood@dunelm.org.uk]
>
> Daniel Ferreira (4):
>    diff: export diffstat interface
>    add--helper: create builtin helper for interactive add
>    add-interactive.c: implement status command
>    add--interactive.perl: use add--helper --status for status_cmd
>
> Slavica Djukic (3):
>    add-interactive.c: implement show-help command
>    t3701-add-interactive: test add_i_show_help()
>    add--interactive.perl: use add--helper --show-help for help_cmd
>
>   .gitignore                 |   1 +
>   Makefile                   |   2 +
>   add-interactive.c          | 263 +++++++++++++++++++++++++++++++++++++
>   add-interactive.h          |  10 ++
>   builtin.h                  |   1 +
>   builtin/add--helper.c      |  43 ++++++
>   diff.c                     |  36 ++---
>   diff.h                     |  18 +++
>   git-add--interactive.perl  |  17 +--
>   git.c                      |   1 +
>   t/t3701-add-interactive.sh |  24 ++++
>   11 files changed, 381 insertions(+), 35 deletions(-)
>   create mode 100644 add-interactive.c
>   create mode 100644 add-interactive.h
>   create mode 100644 builtin/add--helper.c
>
>
> base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v4
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v4
> Pull-Request: https://github.com/gitgitgadget/git/pull/103
>
> Range-diff vs v3:
>
>   1:  737767b6f4 = 1:  737767b6f4 diff: export diffstat interface
>   2:  91b1963125 = 2:  91b1963125 add--helper: create builtin helper for interactive add
>   3:  d247ef69fe = 3:  d247ef69fe add-interactive.c: implement status command
>   4:  4950c889aa ! 4:  fb3f9378ac add--interactive.perl: use add--helper --status for status_cmd
>       @@ -2,12 +2,21 @@
>        
>            add--interactive.perl: use add--helper --status for status_cmd
>        
>       -    Call the newly introduced add--helper builtin on
>       +    Call the newly introduced add--helper builtin in
>            status_cmd() instead of relying on add--interactive's Perl
>       -    functions to build print the numstat.
>       +    functions to print the numstat.
>       +
>       +    If an error occurs, it will be reported, but the Perl script will
>       +    not exit, since the add--helper is called within an eval block.
>       +
>       +    As the Perl script will go away soon, so will this scenario, where
>       +    the built-in helper is called  from the Perl script. Combined with
>       +    the fact that it would be hard to test, we'll pass on adding
>       +    a regression test for this.
>        
>            Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>       +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>        
>         diff --git a/git-add--interactive.perl b/git-add--interactive.perl
>         --- a/git-add--interactive.perl
>       @@ -19,7 +28,8 @@
>        -	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
>        -			list_modified());
>        -	print "\n";
>       -+	system(qw(git add--helper --status));
>       ++	my @status_cmd = ("git", "add--helper", "--status");
>       ++	!system(@status_cmd) or die "@status_cmd exited with code $?";
>         }
>         
>         sub say_n_paths {
>   5:  581b108c9c = 5:  ab16afd1d5 add-interactive.c: implement show-help command
>   6:  aede733318 ! 6:  0a27304a84 t3701-add-interactive: test add_i_show_help()
>       @@ -7,6 +7,7 @@
>            Also, add it before changing git-add--interactive.perl's help_cmd
>            to demonstrate that there are no changes introduced by the
>            conversion to C.
>       +
>            Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
>            to force colored output on Windows.
>        
>       @@ -21,7 +22,7 @@
>         
>        +test_expect_success 'show help from add--helper' '
>        +	git reset --hard &&
>       -+	cat >expect <<-\EOF &&
>       ++	cat >expect <<-EOF &&
>        +
>        +	<BOLD>*** Commands ***<RESET>
>        +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
>       @@ -35,7 +36,7 @@
>        +	<BOLD>*** Commands ***<RESET>
>        +	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
>        +	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
>       -+	<BOLD;BLUE>What now<RESET>>
>       ++	<BOLD;BLUE>What now<RESET>>$SP
>        +	Bye.
>        +	EOF
>        +	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
>   7:  b9a1a7e37a ! 7:  ca2a7c4375 add--interactive.perl: use add--helper --show-help for help_cmd
>       @@ -5,7 +5,15 @@
>            Change help_cmd sub in git-add--interactive.perl to use
>            show-help command from builtin add--helper.
>        
>       +    If an error occurs, it will be reported, but the Perl script will
>       +    not exit, since the add--helper is called within an eval block.
>       +
>       +    Just like the change where the Perl script calls the add--helper
>       +    to print the numstat, also here we forgo adding a regression test:
>       +    the Perl script is on its way out (and this patch is part of that journey).
>       +
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>       +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>        
>         diff --git a/git-add--interactive.perl b/git-add--interactive.perl
>         --- a/git-add--interactive.perl
>       @@ -24,7 +32,8 @@
>        -diff          - view diff between HEAD and index
>        -add untracked - add contents of untracked files to the staged set of changes
>        -EOF
>       -+	system(qw(git add--helper --show-help));
>       ++	my @help_cmd = ("git", "add--helper", "--show-help");
>       ++	!system(@help_cmd) or die "@help_cmd exited with code $?";
>         }
>         
>         sub process_args {
>

Re: [PATCH v4 0/7] Turn git add-i into built-in

[Phillip Wood]

Hi Slavica

On 25/01/2019 12:37, Slavica Djukic wrote:
> Hi Phillip,
> 
> Sorry for omitting you in Cc, again.
> I accidentally wrote yours and Ævar's email prefixed with Cc:, rather 
> then separating
> them with comma, like Johannes said I should.

Don't worry, thanks for emailing here. I've looked at the range diff and 
I think your patches are good.

Best Wishes

Phillip

> 
> -Slavica
> 
> On 25-Jan-19 1:23 PM, Slavica Đukić via GitGitGadget wrote:
>> This is the first version of a patch series to start porting
>> git-add--interactive from Perl to C. Daniel Ferreira's patch series 
>> used as
>> a head start:
>> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u 
>>
>>
>> Changes since v3:
>>
>>   * add error check when calling add--helper's functions from
>>     git-add--interactive.perl
>>   * replace trailing whitespace in the test with variable $SP used in 
>> earlier
>>     tests
>>
>> Cc: Phillip Wood phillip.wood@dunelm.org.uk [phillip.wood@dunelm.org.uk]
>>
>> Daniel Ferreira (4):
>>    diff: export diffstat interface
>>    add--helper: create builtin helper for interactive add
>>    add-interactive.c: implement status command
>>    add--interactive.perl: use add--helper --status for status_cmd
>>
>> Slavica Djukic (3):
>>    add-interactive.c: implement show-help command
>>    t3701-add-interactive: test add_i_show_help()
>>    add--interactive.perl: use add--helper --show-help for help_cmd
>>
>>   .gitignore                 |   1 +
>>   Makefile                   |   2 +
>>   add-interactive.c          | 263 +++++++++++++++++++++++++++++++++++++
>>   add-interactive.h          |  10 ++
>>   builtin.h                  |   1 +
>>   builtin/add--helper.c      |  43 ++++++
>>   diff.c                     |  36 ++---
>>   diff.h                     |  18 +++
>>   git-add--interactive.perl  |  17 +--
>>   git.c                      |   1 +
>>   t/t3701-add-interactive.sh |  24 ++++
>>   11 files changed, 381 insertions(+), 35 deletions(-)
>>   create mode 100644 add-interactive.c
>>   create mode 100644 add-interactive.h
>>   create mode 100644 builtin/add--helper.c
>>
>>
>> base-commit: b21ebb671bb7dea8d342225f0d66c41f4e54d5ca
>> Published-As: 
>> https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v4 
>>
>> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git 
>> pr-103/slavicaDj/add-i-v4
>> Pull-Request: https://github.com/gitgitgadget/git/pull/103
>>
>> Range-diff vs v3:
>>
>>   1:  737767b6f4 = 1:  737767b6f4 diff: export diffstat interface
>>   2:  91b1963125 = 2:  91b1963125 add--helper: create builtin helper 
>> for interactive add
>>   3:  d247ef69fe = 3:  d247ef69fe add-interactive.c: implement status 
>> command
>>   4:  4950c889aa ! 4:  fb3f9378ac add--interactive.perl: use 
>> add--helper --status for status_cmd
>>       @@ -2,12 +2,21 @@
>>            add--interactive.perl: use add--helper --status for status_cmd
>>       -    Call the newly introduced add--helper builtin on
>>       +    Call the newly introduced add--helper builtin in
>>            status_cmd() instead of relying on add--interactive's Perl
>>       -    functions to build print the numstat.
>>       +    functions to print the numstat.
>>       +
>>       +    If an error occurs, it will be reported, but the Perl 
>> script will
>>       +    not exit, since the add--helper is called within an eval 
>> block.
>>       +
>>       +    As the Perl script will go away soon, so will this 
>> scenario, where
>>       +    the built-in helper is called  from the Perl script. 
>> Combined with
>>       +    the fact that it would be hard to test, we'll pass on adding
>>       +    a regression test for this.
>>            Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>>       +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>>         diff --git a/git-add--interactive.perl 
>> b/git-add--interactive.perl
>>         --- a/git-add--interactive.perl
>>       @@ -19,7 +28,8 @@
>>        -    list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
>>        -            list_modified());
>>        -    print "\n";
>>       -+    system(qw(git add--helper --status));
>>       ++    my @status_cmd = ("git", "add--helper", "--status");
>>       ++    !system(@status_cmd) or die "@status_cmd exited with code 
>> $?";
>>         }
>>         sub say_n_paths {
>>   5:  581b108c9c = 5:  ab16afd1d5 add-interactive.c: implement 
>> show-help command
>>   6:  aede733318 ! 6:  0a27304a84 t3701-add-interactive: test 
>> add_i_show_help()
>>       @@ -7,6 +7,7 @@
>>            Also, add it before changing git-add--interactive.perl's 
>> help_cmd
>>            to demonstrate that there are no changes introduced by the
>>            conversion to C.
>>       +
>>            Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
>>            to force colored output on Windows.
>>       @@ -21,7 +22,7 @@
>>        +test_expect_success 'show help from add--helper' '
>>        +    git reset --hard &&
>>       -+    cat >expect <<-\EOF &&
>>       ++    cat >expect <<-EOF &&
>>        +
>>        +    <BOLD>*** Commands ***<RESET>
>>        +      1: <BOLD;BLUE>s<RESET>tatus      2: 
>> <BOLD;BLUE>u<RESET>pdate      3: <BOLD;BLUE>r<RESET>evert      4: 
>> <BOLD;BLUE>a<RESET>dd untracked
>>       @@ -35,7 +36,7 @@
>>        +    <BOLD>*** Commands ***<RESET>
>>        +      1: <BOLD;BLUE>s<RESET>tatus      2: 
>> <BOLD;BLUE>u<RESET>pdate      3: <BOLD;BLUE>r<RESET>evert      4: 
>> <BOLD;BLUE>a<RESET>dd untracked
>>        +      5: <BOLD;BLUE>p<RESET>atch      6: 
>> <BOLD;BLUE>d<RESET>iff      7: <BOLD;BLUE>q<RESET>uit      8: 
>> <BOLD;BLUE>h<RESET>elp
>>       -+    <BOLD;BLUE>What now<RESET>>
>>       ++    <BOLD;BLUE>What now<RESET>>$SP
>>        +    Bye.
>>        +    EOF
>>        +    test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git 
>> add -i >actual.colored &&
>>   7:  b9a1a7e37a ! 7:  ca2a7c4375 add--interactive.perl: use 
>> add--helper --show-help for help_cmd
>>       @@ -5,7 +5,15 @@
>>            Change help_cmd sub in git-add--interactive.perl to use
>>            show-help command from builtin add--helper.
>>       +    If an error occurs, it will be reported, but the Perl 
>> script will
>>       +    not exit, since the add--helper is called within an eval 
>> block.
>>       +
>>       +    Just like the change where the Perl script calls the 
>> add--helper
>>       +    to print the numstat, also here we forgo adding a 
>> regression test:
>>       +    the Perl script is on its way out (and this patch is part 
>> of that journey).
>>       +
>>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>>       +    Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>>         diff --git a/git-add--interactive.perl 
>> b/git-add--interactive.perl
>>         --- a/git-add--interactive.perl
>>       @@ -24,7 +32,8 @@
>>        -diff          - view diff between HEAD and index
>>        -add untracked - add contents of untracked files to the staged 
>> set of changes
>>        -EOF
>>       -+    system(qw(git add--helper --show-help));
>>       ++    my @help_cmd = ("git", "add--helper", "--show-help");
>>       ++    !system(@help_cmd) or die "@help_cmd exited with code $?";
>>         }
>>         sub process_args {
>>

[PATCH v5 00/10] Turn git add-i into built-in

[Slavica Đukić via GitGitGadget]

This is the first version of a patch series to start porting
git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
a head start:
https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u

Changes since v4:

 * rename print_modified to list_modifed
 * the big change was implementing list_and_choose, which resulted in code
   refactoring, i.e. separating list_modified and status_cmd and making
   status_cmd use both list_modified and list_and_choose
 * implement struct choice instead of struct stuff_item as main data
   structure for list_and_choose
 * introduce list_only option and implement support for !list_only users
 * introduce highlighting of unique prefixes

Note that authorship handling is slightly changed. In some of the commits, I
used Original-patch-by instead of listing Daniel Ferreira as author.

Also, I would like to point out that my Outreachy internship is going to
finish on March 4 and I would really appreciate reviews before it does.

Daniel Ferreira (3):
  diff: export diffstat interface
  add--helper: create builtin helper for interactive add
  add--interactive.perl: use add--helper --status for status_cmd

Slavica Djukic (7):
  add-interactive.c: implement list_modified
  add-interactive.c: implement list_and_choose
  add-interactive.c: implement status command
  add-interactive.c: add support for list_only option
  add-interactive.c: implement show-help command
  t3701-add-interactive: test add_i_show_help()
  add--interactive.perl: use add--helper --show-help for help_cmd

 .gitignore                 |   1 +
 Makefile                   |   2 +
 add-interactive.c          | 819 +++++++++++++++++++++++++++++++++++++
 add-interactive.h          |  10 +
 builtin.h                  |   1 +
 builtin/add--helper.c      |  43 ++
 diff.c                     |  36 +-
 diff.h                     |  18 +
 git-add--interactive.perl  |  17 +-
 git.c                      |   1 +
 t/t3701-add-interactive.sh |  24 ++
 11 files changed, 937 insertions(+), 35 deletions(-)
 create mode 100644 add-interactive.c
 create mode 100644 add-interactive.h
 create mode 100644 builtin/add--helper.c


base-commit: ca1b4116483b397e78483376296bcd23916ab553
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v5
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v5
Pull-Request: https://github.com/gitgitgadget/git/pull/103

Range-diff vs v4:

  1:  737767b6f4 !  1:  d839f0c082 diff: export diffstat interface
     @@ -11,6 +11,7 @@
          how the show_* functions used by diff_flush() do it. One example is the
          builtin implementation of git-add--interactive's status.
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
  2:  91b1963125 !  2:  304c3863b1 add--helper: create builtin helper for interactive add
     @@ -2,8 +2,8 @@
      
          add--helper: create builtin helper for interactive add
      
     -    Create a builtin helper for git-add--interactive, which right now is not
     -    able to do anything.
     +    Create a builtin helper for git-add--interactive, which at this point
     +    is not doing anything.
      
          This is the first step in an effort to convert git-add--interactive.perl
          to a C builtin, in search for better portability, expressibility and
     @@ -13,6 +13,7 @@
          remove the last "big" Git script to have Perl as a dependency, allowing
          most Git users to have a NOPERL build running without big losses.
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
  3:  d247ef69fe !  3:  8790ffaa39 add-interactive.c: implement status command
     @@ -1,17 +1,12 @@
     -Author: Daniel Ferreira <bnmvco@gmail.com>
     +Author: Slavica Djukic <slawica92@hotmail.com>
      
     -    add-interactive.c: implement status command
     +    add-interactive.c: implement list_modified
      
     -    Add new files: add-interactive.c and add-interactive.h, which
     -    will be used for implementing "application logic" of git add -i,
     -    whereas add--helper.c will be used mostly for parsing the command line.
     -    We're a bit lax with the command-line parsing, as the command is
     -    intended to be called only by one internal user: the add--interactive script.
     +    Implement list_modified from Perl, which will be used
     +    by most of the *_cmd functions, including status in the
     +    following commit.
      
     -    Implement add --interactive's status command in add-interactive.c and
     -    use it in builtin add--helper.c.
     -
     -    It prints a numstat comparing changed files between a) the worktree and
     +    It lists a numstat comparing changed files between a) the worktree and
          the index; b) the index and the HEAD.
      
          To do so, we use run_diff_index() and run_diff_files() to get changed
     @@ -19,11 +14,13 @@
          combination of a hashmap and qsort() to print the result in
          O(n) + O(n lg n) complexity.
      
     -    This is the first interactive add command implemented in C of those
     -    anticipated by the previous commit, which introduced
     -    the add--helper built-in.
     +    Add new file: add-interactive.c which will be used for implementing
     +    "application logic" of git add -i (alongside with add-interactive.h,
     +    added in later commit), whereas add--helper.c will be used mostly
     +    for parsing the command line.
      
     -    Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
     +    Original-patch-by: Daniel Ferreira <bnmvco@gmail.com>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
       diff --git a/Makefile b/Makefile
     @@ -43,7 +40,6 @@
       --- /dev/null
       +++ b/add-interactive.c
      @@
     -+#include "add-interactive.h"
      +#include "cache.h"
      +#include "commit.h"
      +#include "color.h"
     @@ -51,8 +47,6 @@
      +#include "diffcore.h"
      +#include "revision.h"
      +
     -+#define HEADER_INDENT "      "
     -+
      +enum collection_phase {
      +	WORKTREE,
      +	INDEX
     @@ -75,66 +69,8 @@
      +	struct hashmap file_map;
      +};
      +
     -+static int use_color = -1;
     -+enum color_add_i {
     -+	COLOR_PROMPT,
     -+	COLOR_HEADER,
     -+	COLOR_HELP,
     -+	COLOR_ERROR
     -+};
     -+
     -+static char colors[][COLOR_MAXLEN] = {
     -+	GIT_COLOR_BOLD_BLUE, /* Prompt */
     -+	GIT_COLOR_BOLD,      /* Header */
     -+	GIT_COLOR_BOLD_RED,  /* Help */
     -+	GIT_COLOR_BOLD_RED   /* Error */
     -+};
     -+
     -+static const char *get_color(enum color_add_i ix)
     -+{
     -+	if (want_color(use_color))
     -+		return colors[ix];
     -+	return "";
     -+}
     -+
     -+static int parse_color_slot(const char *slot)
     -+{
     -+	if (!strcasecmp(slot, "prompt"))
     -+		return COLOR_PROMPT;
     -+	if (!strcasecmp(slot, "header"))
     -+		return COLOR_HEADER;
     -+	if (!strcasecmp(slot, "help"))
     -+		return COLOR_HELP;
     -+	if (!strcasecmp(slot, "error"))
     -+		return COLOR_ERROR;
     -+
     -+	return -1;
     -+}
     -+
     -+int add_i_config(const char *var,
     -+		const char *value, void *cbdata)
     -+{
     -+	const char *name;
     -+
     -+	if (!strcmp(var, "color.interactive")) {
     -+		use_color = git_config_colorbool(var, value);
     -+		return 0;
     -+	}
     -+
     -+	if (skip_prefix(var, "color.interactive.", &name)) {
     -+		int slot = parse_color_slot(name);
     -+		if (slot < 0)
     -+			return 0;
     -+		if (!value)
     -+			return config_error_nonbool(var);
     -+		return color_parse(value, colors[slot]);
     -+	}
     -+
     -+	return git_default_config(var, value, cbdata);
     -+}
     -+
      +static int hash_cmp(const void *unused_cmp_data, const void *entry,
     -+			const void *entry_or_key, const void *keydata)
     ++		    const void *entry_or_key, const void *keydata)
      +{
      +	const struct file_stat *e1 = entry, *e2 = entry_or_key;
      +	const char *name = keydata ? keydata : e2->name;
     @@ -151,8 +87,8 @@
      +}
      +
      +static void collect_changes_cb(struct diff_queue_struct *q,
     -+					 struct diff_options *options,
     -+					 void *data)
     ++			       struct diff_options *options,
     ++			       void *data)
      +{
      +	struct collection_status *s = data;
      +	struct diffstat_t stat = { 0 };
     @@ -222,128 +158,73 @@
      +	run_diff_index(&rev, 1);
      +}
      +
     -+void add_i_print_modified(void)
     ++static int is_inital_commit(void)
      +{
     -+	int i = 0;
     -+	struct collection_status s;
     -+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
     -+	const char *modified_fmt = _("%12s %12s %s");
     -+	const char *header_color = get_color(COLOR_HEADER);
      +	struct object_id sha1;
     ++	if (get_oid("HEAD", &sha1))
     ++		return 1;
     ++	return 0;
     ++}
     ++
     ++static const char *get_diff_reference(void)
     ++{
     ++	if(is_inital_commit())
     ++		return empty_tree_oid_hex();
     ++	return "HEAD";
     ++}
     ++
     ++static void filter_files(const char *filter, struct hashmap *file_map,
     ++			 struct file_stat **files)
     ++{
     ++
     ++	for (int i = 0; i < hashmap_get_size(file_map); i++) {
     ++		struct file_stat *f = files[i];
     ++
     ++		if ((!(f->worktree.added || f->worktree.deleted)) &&
     ++		   (!strcmp(filter, "file-only")))
     ++				hashmap_remove(file_map, f, NULL);
      +
     ++		if ((!(f->index.added || f->index.deleted)) &&
     ++		   (!strcmp(filter, "index-only")))
     ++				hashmap_remove(file_map, f, NULL);
     ++	}
     ++}
     ++
     ++static struct collection_status *list_modified(struct repository *r, const char *filter)
     ++{
     ++	int i = 0;
     ++	struct collection_status *s = xcalloc(1, sizeof(*s));
      +	struct hashmap_iter iter;
      +	struct file_stat **files;
      +	struct file_stat *entry;
      +
     -+	if (read_cache() < 0)
     -+		return;
     ++	if (repo_read_index(r) < 0) {
     ++		printf("\n");
     ++		return NULL;
     ++	}
      +
     -+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
     -+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
     ++	s->reference = get_diff_reference();
     ++	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
      +
     -+	collect_changes_worktree(&s);
     -+	collect_changes_index(&s);
     ++	collect_changes_worktree(s);
     ++	collect_changes_index(s);
      +
     -+	if (hashmap_get_size(&s.file_map) < 1) {
     ++	if (hashmap_get_size(&s->file_map) < 1) {
      +		printf("\n");
     -+		return;
     ++		return NULL;
      +	}
      +
     -+	printf(HEADER_INDENT);
     -+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
     -+			_("unstaged"), _("path"));
     -+	printf("\n");
     -+
     -+	hashmap_iter_init(&s.file_map, &iter);
     ++	hashmap_iter_init(&s->file_map, &iter);
      +
     -+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
     ++	files = xcalloc(hashmap_get_size(&s->file_map), sizeof(struct file_stat *));
      +	while ((entry = hashmap_iter_next(&iter))) {
      +		files[i++] = entry;
      +	}
     -+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
     ++	QSORT(files, hashmap_get_size(&s->file_map), alphabetical_cmp);
      +
     -+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
     -+		struct file_stat *f = files[i];
     -+
     -+		char worktree_changes[50];
     -+		char index_changes[50];
     -+
     -+		if (f->worktree.added || f->worktree.deleted)
     -+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
     -+					f->worktree.deleted);
     -+		else
     -+			snprintf(worktree_changes, 50, "%s", _("nothing"));
     -+
     -+		if (f->index.added || f->index.deleted)
     -+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
     -+					f->index.deleted);
     -+		else
     -+			snprintf(index_changes, 50, "%s", _("unchanged"));
     -+
     -+		printf(" %2d: ", i + 1);
     -+		printf(modified_fmt, index_changes, worktree_changes, f->name);
     -+		printf("\n");
     -+	}
     -+	printf("\n");
     ++	if (filter)
     ++		filter_files(filter, &s->file_map, files);
      +
      +	free(files);
     -+	hashmap_free(&s.file_map, 1);
     ++	return s;
      +}
     -
     - diff --git a/add-interactive.h b/add-interactive.h
     - new file mode 100644
     - --- /dev/null
     - +++ b/add-interactive.h
     -@@
     -+#ifndef ADD_INTERACTIVE_H
     -+#define ADD_INTERACTIVE_H
     -+
     -+int add_i_config(const char *var, const char *value, void *cbdata);
     -+
     -+void add_i_print_modified(void);
     -+
     -+#endif
     - \ No newline at end of file
     -
     - diff --git a/builtin/add--helper.c b/builtin/add--helper.c
     - --- a/builtin/add--helper.c
     - +++ b/builtin/add--helper.c
     -@@
     -+#include "add-interactive.h"
     - #include "builtin.h"
     -+#include "config.h"
     -+#include "revision.h"
     -+
     -+static const char * const builtin_add_helper_usage[] = {
     -+	N_("git add-interactive--helper <command>"),
     -+	NULL
     -+};
     -+
     -+enum cmd_mode {
     -+	DEFAULT = 0,
     -+	STATUS
     -+};
     - 
     - int cmd_add__helper(int argc, const char **argv, const char *prefix)
     - {
     -+	enum cmd_mode mode = DEFAULT;
     -+
     -+	struct option options[] = {
     -+		OPT_CMDMODE(0, "status", &mode,
     -+			 N_("print status information with diffstat"), STATUS),
     -+		OPT_END()
     -+	};
     -+
     -+	git_config(add_i_config, NULL);
     -+	argc = parse_options(argc, argv, NULL, options,
     -+			     builtin_add_helper_usage,
     -+			     PARSE_OPT_KEEP_ARGV0);
     -+
     -+	if (mode == STATUS)
     -+		add_i_print_modified();
     -+	else
     -+		usage_with_options(builtin_add_helper_usage,
     -+				   options);
     -+
     - 	return 0;
     - }
  -:  ---------- >  4:  a97b29d274 add-interactive.c: implement list_and_choose
  -:  ---------- >  5:  9a72aabe6c add-interactive.c: implement status command
  4:  fb3f9378ac !  6:  883963ee6e add--interactive.perl: use add--helper --status for status_cmd
     @@ -14,6 +14,7 @@
          the fact that it would be hard to test, we'll pass on adding
          a regression test for this.
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
          Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
  -:  ---------- >  7:  7912f37517 add-interactive.c: add support for list_only option
  5:  ab16afd1d5 !  8:  441321fc3d add-interactive.c: implement show-help command
     @@ -10,31 +10,32 @@
          handle_builtin and re-routed to the help command, without ever
          calling cmd_add__helper().
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
       diff --git a/add-interactive.c b/add-interactive.c
       --- a/add-interactive.c
       +++ b/add-interactive.c
      @@
     - 	free(files);
     - 	hashmap_free(&s.file_map, 1);
     + 	free(s);
     + 	free_choices(&choices);
       }
      +
      +void add_i_show_help(void)
      +{
      +	const char *help_color = get_color(COLOR_HELP);
      +	color_fprintf_ln(stdout, help_color, "status        - %s",
     -+			_("show paths with changes"));
     ++			 _("show paths with changes"));
      +	color_fprintf_ln(stdout, help_color, "update        - %s",
     -+			_("add working tree state to the staged set of changes"));
     ++			 _("add working tree state to the staged set of changes"));
      +	color_fprintf_ln(stdout, help_color, "revert        - %s",
     -+			_("revert staged set of changes back to the HEAD version"));
     ++			 _("revert staged set of changes back to the HEAD version"));
      +	color_fprintf_ln(stdout, help_color, "patch         - %s",
     -+			_("pick hunks and update selectively"));
     ++			 _("pick hunks and update selectively"));
      +	color_fprintf_ln(stdout, help_color, "diff          - %s",
     -+			_("view diff between HEAD and index"));
     ++			 _("view diff between HEAD and index"));
      +	color_fprintf_ln(stdout, help_color, "add untracked - %s",
     -+			_("add contents of untracked files to the staged set of changes"));
     ++			 _("add contents of untracked files to the staged set of changes"));
      +}
      
       diff --git a/add-interactive.h b/add-interactive.h
     @@ -42,13 +43,11 @@
       +++ b/add-interactive.h
      @@
       
     - void add_i_print_modified(void);
     + void add_i_status(void);
       
     --#endif
     - \ No newline at end of file
      +void add_i_show_help(void);
      +
     -+#endif
     + #endif
      
       diff --git a/builtin/add--helper.c b/builtin/add--helper.c
       --- a/builtin/add--helper.c
     @@ -66,16 +65,16 @@
      @@
       	struct option options[] = {
       		OPT_CMDMODE(0, "status", &mode,
     - 			 N_("print status information with diffstat"), STATUS),
     + 			    N_("print status information with diffstat"), STATUS),
      +		OPT_CMDMODE(0, "show-help", &mode,
     -+			 N_("show help"), HELP),
     ++			    N_("show help"), HELP),
       		OPT_END()
       	};
       
      @@
       
       	if (mode == STATUS)
     - 		add_i_print_modified();
     + 		add_i_status();
      +	else if (mode == HELP)
      +		add_i_show_help();
       	else
  6:  0a27304a84 !  9:  315ae8b211 t3701-add-interactive: test add_i_show_help()
     @@ -11,6 +11,7 @@
          Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
          to force colored output on Windows.
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
      
       diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
  7:  ca2a7c4375 ! 10:  2b4bdce730 add--interactive.perl: use add--helper --show-help for help_cmd
     @@ -12,6 +12,7 @@
          to print the numstat, also here we forgo adding a regression test:
          the Perl script is on its way out (and this patch is part of that journey).
      
     +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
          Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
          Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
      

-- 
gitgitgadget

[PATCH v5 01/10] diff: export diffstat interface

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Make the diffstat interface (namely, the diffstat_t struct and
compute_diffstat) no longer be internal to diff.c and allow it to be used
by other parts of git.

This is helpful for code that may want to easily extract information
from files using the diff machinery, while flushing it differently from
how the show_* functions used by diff_flush() do it. One example is the
builtin implementation of git-add--interactive's status.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 diff.c | 36 ++++++++++++++----------------------
 diff.h | 18 ++++++++++++++++++
 2 files changed, 32 insertions(+), 22 deletions(-)

diff --git a/diff.c b/diff.c
index 5306c48652..e290a95f4b 100644
--- a/diff.c
+++ b/diff.c
@@ -2489,22 +2489,6 @@ static void pprint_rename(struct strbuf *name, const char *a, const char *b)
 	}
 }
 
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
 static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
 					  const char *name_a,
 					  const char *name_b)
@@ -6001,12 +5985,7 @@ void diff_flush(struct diff_options *options)
 	    dirstat_by_line) {
 		struct diffstat_t diffstat;
 
-		memset(&diffstat, 0, sizeof(struct diffstat_t));
-		for (i = 0; i < q->nr; i++) {
-			struct diff_filepair *p = q->queue[i];
-			if (check_pair_status(p))
-				diff_flush_stat(p, options, &diffstat);
-		}
+		compute_diffstat(options, &diffstat);
 		if (output_format & DIFF_FORMAT_NUMSTAT)
 			show_numstat(&diffstat, options);
 		if (output_format & DIFF_FORMAT_DIFFSTAT)
@@ -6306,6 +6285,19 @@ static int is_submodule_ignored(const char *path, struct diff_options *options)
 	return ignored;
 }
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
+{
+	int i;
+	struct diff_queue_struct *q = &diff_queued_diff;
+
+	memset(diffstat, 0, sizeof(struct diffstat_t));
+	for (i = 0; i < q->nr; i++) {
+		struct diff_filepair *p = q->queue[i];
+		if (check_pair_status(p))
+			diff_flush_stat(p, options, diffstat);
+	}
+}
+
 void diff_addremove(struct diff_options *options,
 		    int addremove, unsigned mode,
 		    const struct object_id *oid,
diff --git a/diff.h b/diff.h
index b512d0477a..a4a986ad6e 100644
--- a/diff.h
+++ b/diff.h
@@ -240,6 +240,22 @@ void diff_emit_submodule_error(struct diff_options *o, const char *err);
 void diff_emit_submodule_pipethrough(struct diff_options *o,
 				     const char *line, int len);
 
+struct diffstat_t {
+	int nr;
+	int alloc;
+	struct diffstat_file {
+		char *from_name;
+		char *name;
+		char *print_name;
+		const char *comments;
+		unsigned is_unmerged:1;
+		unsigned is_binary:1;
+		unsigned is_renamed:1;
+		unsigned is_interesting:1;
+		uintmax_t added, deleted;
+	} **files;
+};
+
 enum color_diff {
 	DIFF_RESET = 0,
 	DIFF_CONTEXT = 1,
@@ -328,6 +344,8 @@ void diff_change(struct diff_options *,
 
 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 
+void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat);
+
 #define DIFF_SETUP_REVERSE      	1
 #define DIFF_SETUP_USE_SIZE_CACHE	4
 
-- 
gitgitgadget

[PATCH v5 02/10] add--helper: create builtin helper for interactive add

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Create a builtin helper for git-add--interactive, which at this point
is not doing anything.

This is the first step in an effort to convert git-add--interactive.perl
to a C builtin, in search for better portability, expressibility and
performance (specially on non-POSIX systems like Windows).

Additionally, an eventual complete port of git-add--interactive would
remove the last "big" Git script to have Perl as a dependency, allowing
most Git users to have a NOPERL build running without big losses.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 .gitignore            | 1 +
 Makefile              | 1 +
 builtin.h             | 1 +
 builtin/add--helper.c | 6 ++++++
 git.c                 | 1 +
 5 files changed, 10 insertions(+)
 create mode 100644 builtin/add--helper.c

diff --git a/.gitignore b/.gitignore
index 7374587f9d..7b6d7681f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@
 /git
 /git-add
 /git-add--interactive
+/git-add--helper
 /git-am
 /git-annotate
 /git-apply
diff --git a/Makefile b/Makefile
index f0b2299172..e64e202deb 100644
--- a/Makefile
+++ b/Makefile
@@ -1043,6 +1043,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/add--helper.o
 BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..dd811ef7d5 100644
--- a/builtin.h
+++ b/builtin.h
@@ -128,6 +128,7 @@ extern void setup_auto_pager(const char *cmd, int def);
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_add__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
new file mode 100644
index 0000000000..6a97f0e191
--- /dev/null
+++ b/builtin/add--helper.c
@@ -0,0 +1,6 @@
+#include "builtin.h"
+
+int cmd_add__helper(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/git.c b/git.c
index 2dd588674f..cb42591f37 100644
--- a/git.c
+++ b/git.c
@@ -444,6 +444,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-- 
gitgitgadget

[PATCH v5 03/10] add-interactive.c: implement list_modified

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement list_modified from Perl, which will be used
by most of the *_cmd functions, including status in the
following commit.

It lists a numstat comparing changed files between a) the worktree and
the index; b) the index and the HEAD.

To do so, we use run_diff_index() and run_diff_files() to get changed
files, use the diffstat API on them to get the numstat and use a
combination of a hashmap and qsort() to print the result in
O(n) + O(n lg n) complexity.

Add new file: add-interactive.c which will be used for implementing
"application logic" of git add -i (alongside with add-interactive.h,
added in later commit), whereas add--helper.c will be used mostly
for parsing the command line.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Original-patch-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 Makefile          |   1 +
 add-interactive.c | 188 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 189 insertions(+)
 create mode 100644 add-interactive.c

diff --git a/Makefile b/Makefile
index e64e202deb..1b3c06b633 100644
--- a/Makefile
+++ b/Makefile
@@ -847,6 +847,7 @@ LIB_H = $(shell $(FIND) . \
 	-name '*.h' -print)
 
 LIB_OBJS += abspath.o
+LIB_OBJS += add-interactive.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
diff --git a/add-interactive.c b/add-interactive.c
new file mode 100644
index 0000000000..7d096207d4
--- /dev/null
+++ b/add-interactive.c
@@ -0,0 +1,188 @@
+#include "cache.h"
+#include "commit.h"
+#include "color.h"
+#include "config.h"
+#include "diffcore.h"
+#include "revision.h"
+
+enum collection_phase {
+	WORKTREE,
+	INDEX
+};
+
+struct file_stat {
+	struct hashmap_entry ent;
+	struct {
+		uintmax_t added, deleted;
+	} index, worktree;
+	char name[FLEX_ARRAY];
+};
+
+struct collection_status {
+	enum collection_phase phase;
+
+	const char *reference;
+	struct pathspec pathspec;
+
+	struct hashmap file_map;
+};
+
+static int hash_cmp(const void *unused_cmp_data, const void *entry,
+		    const void *entry_or_key, const void *keydata)
+{
+	const struct file_stat *e1 = entry, *e2 = entry_or_key;
+	const char *name = keydata ? keydata : e2->name;
+
+	return strcmp(e1->name, name);
+}
+
+static int alphabetical_cmp(const void *a, const void *b)
+{
+	struct file_stat *f1 = *((struct file_stat **)a);
+	struct file_stat *f2 = *((struct file_stat **)b);
+
+	return strcmp(f1->name, f2->name);
+}
+
+static void collect_changes_cb(struct diff_queue_struct *q,
+			       struct diff_options *options,
+			       void *data)
+{
+	struct collection_status *s = data;
+	struct diffstat_t stat = { 0 };
+	int i;
+
+	if (!q->nr)
+		return;
+
+	compute_diffstat(options, &stat);
+
+	for (i = 0; i < stat.nr; i++) {
+		struct file_stat *entry;
+		const char *name = stat.files[i]->name;
+		unsigned int hash = strhash(name);
+
+		entry = hashmap_get_from_hash(&s->file_map, hash, name);
+		if (!entry) {
+			FLEX_ALLOC_STR(entry, name, name);
+			hashmap_entry_init(entry, hash);
+			hashmap_add(&s->file_map, entry);
+		}
+
+		if (s->phase == WORKTREE) {
+			entry->worktree.added = stat.files[i]->added;
+			entry->worktree.deleted = stat.files[i]->deleted;
+		} else if (s->phase == INDEX) {
+			entry->index.added = stat.files[i]->added;
+			entry->index.deleted = stat.files[i]->deleted;
+		}
+	}
+}
+
+static void collect_changes_worktree(struct collection_status *s)
+{
+	struct rev_info rev;
+
+	s->phase = WORKTREE;
+
+	init_revisions(&rev, NULL);
+	setup_revisions(0, NULL, &rev, NULL);
+
+	rev.max_count = 0;
+
+	rev.diffopt.flags.ignore_dirty_submodules = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_files(&rev, 0);
+}
+
+static void collect_changes_index(struct collection_status *s)
+{
+	struct rev_info rev;
+	struct setup_revision_opt opt = { 0 };
+
+	s->phase = INDEX;
+
+	init_revisions(&rev, NULL);
+	opt.def = s->reference;
+	setup_revisions(0, NULL, &rev, &opt);
+
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = collect_changes_cb;
+	rev.diffopt.format_callback_data = s;
+
+	run_diff_index(&rev, 1);
+}
+
+static int is_inital_commit(void)
+{
+	struct object_id sha1;
+	if (get_oid("HEAD", &sha1))
+		return 1;
+	return 0;
+}
+
+static const char *get_diff_reference(void)
+{
+	if(is_inital_commit())
+		return empty_tree_oid_hex();
+	return "HEAD";
+}
+
+static void filter_files(const char *filter, struct hashmap *file_map,
+			 struct file_stat **files)
+{
+
+	for (int i = 0; i < hashmap_get_size(file_map); i++) {
+		struct file_stat *f = files[i];
+
+		if ((!(f->worktree.added || f->worktree.deleted)) &&
+		   (!strcmp(filter, "file-only")))
+				hashmap_remove(file_map, f, NULL);
+
+		if ((!(f->index.added || f->index.deleted)) &&
+		   (!strcmp(filter, "index-only")))
+				hashmap_remove(file_map, f, NULL);
+	}
+}
+
+static struct collection_status *list_modified(struct repository *r, const char *filter)
+{
+	int i = 0;
+	struct collection_status *s = xcalloc(1, sizeof(*s));
+	struct hashmap_iter iter;
+	struct file_stat **files;
+	struct file_stat *entry;
+
+	if (repo_read_index(r) < 0) {
+		printf("\n");
+		return NULL;
+	}
+
+	s->reference = get_diff_reference();
+	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
+
+	collect_changes_worktree(s);
+	collect_changes_index(s);
+
+	if (hashmap_get_size(&s->file_map) < 1) {
+		printf("\n");
+		return NULL;
+	}
+
+	hashmap_iter_init(&s->file_map, &iter);
+
+	files = xcalloc(hashmap_get_size(&s->file_map), sizeof(struct file_stat *));
+	while ((entry = hashmap_iter_next(&iter))) {
+		files[i++] = entry;
+	}
+	QSORT(files, hashmap_get_size(&s->file_map), alphabetical_cmp);
+
+	if (filter)
+		filter_files(filter, &s->file_map, files);
+
+	free(files);
+	return s;
+}
-- 
gitgitgadget

[PATCH v5 04/10] add-interactive.c: implement list_and_choose

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

This is one of the two functions translated from Perl script, besides
list_modified that will be used by *_cmd functions (including status)
to collect index/worktree changes, list those changes and let user
make a choice.

At this point, it only prints worktree and index changes, but later on
in this patch series there will be upgraded to highlighting unique
prefixes of list items and let user pick those items.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)

diff --git a/add-interactive.c b/add-interactive.c
index 7d096207d4..9a475a5d48 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -5,6 +5,8 @@
 #include "diffcore.h"
 #include "revision.h"
 
+#define HEADER_INDENT "      "
+
 enum collection_phase {
 	WORKTREE,
 	INDEX
@@ -27,6 +29,61 @@ struct collection_status {
 	struct hashmap file_map;
 };
 
+struct list_and_choose_options {
+	int column_n;
+	unsigned singleton:1;
+	unsigned list_flat:1;
+	unsigned list_only:1;
+	unsigned list_only_file_names:1;
+	unsigned immediate:1;
+	char *header;
+	const char *prompt;
+	void (*on_eof_fn)(void);
+};
+
+struct choice {
+	struct hashmap_entry e;
+	char type;
+	union {
+		void (*command_fn)(void);
+		struct {
+			struct {
+				uintmax_t added, deleted;
+			} index, worktree;
+		} file;
+	} u;
+	size_t prefix_length;
+	const char *name;
+};
+
+struct choices {
+	struct choice **choices;
+	size_t alloc, nr;
+};
+#define CHOICES_INIT { NULL, 0, 0 }
+
+static int use_color = -1;
+enum color_add_i {
+	COLOR_PROMPT,
+	COLOR_HEADER,
+	COLOR_HELP,
+	COLOR_ERROR
+};
+
+static char colors[][COLOR_MAXLEN] = {
+	GIT_COLOR_BOLD_BLUE, /* Prompt */
+	GIT_COLOR_BOLD,      /* Header */
+	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_RESET      /* Reset */
+};
+
+static const char *get_color(enum color_add_i ix)
+{
+	if (want_color(use_color))
+		return colors[ix];
+	return "";
+}
+
 static int hash_cmp(const void *unused_cmp_data, const void *entry,
 		    const void *entry_or_key, const void *keydata)
 {
@@ -186,3 +243,73 @@ static struct collection_status *list_modified(struct repository *r, const char
 	free(files);
 	return s;
 }
+
+static struct choices *list_and_choose(struct choices *data,
+				       struct list_and_choose_options *opts)
+{
+	if (!data)
+		return NULL;
+
+	while (1) {
+		int last_lf = 0;
+
+		if (opts->header) {
+			const char *header_color = get_color(COLOR_HEADER);
+			if (!opts->list_flat)
+				printf(HEADER_INDENT);
+			color_fprintf_ln(stdout, header_color, "%s", opts->header);
+		}
+
+		for (int i = 0; i < data->nr; i++) {
+			struct choice *c = data->choices[i];
+			char *print;
+			const char *modified_fmt = _("%12s %12s %s");
+			char worktree_changes[50];
+			char index_changes[50];
+			char print_buf[100];
+
+			print = (char *)c->name;
+			
+			if ((data->choices[i]->type == 'f') && (!opts->list_only_file_names)) {
+				uintmax_t worktree_added = c->u.file.worktree.added;
+				uintmax_t worktree_deleted = c->u.file.worktree.deleted;
+				uintmax_t index_added = c->u.file.index.added;
+				uintmax_t index_deleted = c->u.file.index.deleted;
+
+				if (worktree_added || worktree_deleted)
+					snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
+						 worktree_added, worktree_deleted);
+				else
+					snprintf(worktree_changes, 50, "%s", _("nothing"));
+
+				if (index_added || index_deleted)
+					snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
+						 index_added, index_deleted);
+				else
+					snprintf(index_changes, 50, "%s", _("unchanged"));
+
+				snprintf(print_buf, 100, modified_fmt, index_changes,
+					 worktree_changes, print);
+				print = xmalloc(strlen(print_buf) + 1);
+				snprintf(print, 100, "%s", print_buf);
+			}
+
+			printf(" %2d: %s", i + 1, print);
+
+			if ((opts->list_flat) && ((i + 1) % (opts->column_n))) {
+				printf("\t");
+				last_lf = 0;
+			}
+			else {
+				printf("\n");
+				last_lf = 1;
+			}
+
+		}
+
+		if (!last_lf)
+			printf("\n");
+
+		return NULL;
+	}
+}
-- 
gitgitgadget

[PATCH v5 06/10] add--interactive.perl: use add--helper --status for status_cmd

[Daniel Ferreira via GitGitGadget]

From: Daniel Ferreira <bnmvco@gmail.com>

Call the newly introduced add--helper builtin in
status_cmd() instead of relying on add--interactive's Perl
functions to print the numstat.

If an error occurs, it will be reported, but the Perl script will
not exit, since the add--helper is called within an eval block.

As the Perl script will go away soon, so will this scenario, where
the built-in helper is called  from the Perl script. Combined with
the fact that it would be hard to test, we'll pass on adding
a regression test for this.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 git-add--interactive.perl | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 20eb81cc92..c2c6b4d5e3 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -597,9 +597,8 @@ sub prompt_help_cmd {
 }
 
 sub status_cmd {
-	list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
-			list_modified());
-	print "\n";
+	my @status_cmd = ("git", "add--helper", "--status");
+	!system(@status_cmd) or die "@status_cmd exited with code $?";
 }
 
 sub say_n_paths {
-- 
gitgitgadget

[PATCH v5 05/10] add-interactive.c: implement status command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement add --interactive's status command in add-interactive.c and
use it in builtin add--helper.c.
This is the first interactive add command implemented in C of those
anticipated by the previous commit, which introduced
the add--helper built-in.

Implement additional helper functions dealing with struct choice and
colors.

Use list_modified to get the data, and then pass it to list_and_choose
to show it in appropriate format.

We're a bit lax with the command-line parsing, as the command is
intended to be called only by one internal user: the add--interactive script.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Original-patch-by: Daniel Ferreira <bnmvco@gmail.com>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 119 ++++++++++++++++++++++++++++++++++++++++++
 add-interactive.h     |   8 +++
 builtin/add--helper.c |  32 ++++++++++++
 3 files changed, 159 insertions(+)
 create mode 100644 add-interactive.h

diff --git a/add-interactive.c b/add-interactive.c
index 9a475a5d48..6bf8a90d9d 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -1,3 +1,4 @@
+#include "add-interactive.h"
 #include "cache.h"
 #include "commit.h"
 #include "color.h"
@@ -7,6 +8,8 @@
 
 #define HEADER_INDENT "      "
 
+#define HEADER_MAXLEN 30
+
 enum collection_phase {
 	WORKTREE,
 	INDEX
@@ -29,6 +32,11 @@ struct collection_status {
 	struct hashmap file_map;
 };
 
+struct command {
+	char *name;
+	void (*command_fn)(void);
+};
+
 struct list_and_choose_options {
 	int column_n;
 	unsigned singleton:1;
@@ -84,6 +92,42 @@ static const char *get_color(enum color_add_i ix)
 	return "";
 }
 
+static int parse_color_slot(const char *slot)
+{
+	if (!strcasecmp(slot, "prompt"))
+		return COLOR_PROMPT;
+	if (!strcasecmp(slot, "header"))
+		return COLOR_HEADER;
+	if (!strcasecmp(slot, "help"))
+		return COLOR_HELP;
+	if (!strcasecmp(slot, "error"))
+		return COLOR_ERROR;
+
+	return -1;
+}
+
+int add_i_config(const char *var,
+		 const char *value, void *cbdata)
+{
+	const char *name;
+
+	if (!strcmp(var, "color.interactive")) {
+		use_color = git_config_colorbool(var, value);
+		return 0;
+	}
+
+	if (skip_prefix(var, "color.interactive.", &name)) {
+		int slot = parse_color_slot(name);
+		if (slot < 0)
+			return 0;
+		if (!value)
+			return config_error_nonbool(var);
+		return color_parse(value, colors[slot]);
+	}
+
+	return git_default_config(var, value, cbdata);
+}
+
 static int hash_cmp(const void *unused_cmp_data, const void *entry,
 		    const void *entry_or_key, const void *keydata)
 {
@@ -313,3 +357,78 @@ static struct choices *list_and_choose(struct choices *data,
 		return NULL;
 	}
 }
+
+static struct choice *make_choice(const char *name )
+{
+	struct choice *choice;
+	FLEXPTR_ALLOC_STR(choice, name, name);
+	return choice;
+}
+
+static struct choice *add_choice(struct choices *choices, const char type,
+				 struct file_stat *file, struct command *command)
+{
+	struct choice *choice;
+	switch (type) {
+		case 'f':
+			choice = make_choice(file->name);
+			choice->u.file.index.added = file->index.added;
+			choice->u.file.index.deleted = file->index.deleted;
+			choice->u.file.worktree.added = file->worktree.added;
+			choice->u.file.worktree.deleted = file->worktree.deleted;
+			break;
+		case 'c':
+			choice = make_choice(command->name);
+			choice->u.command_fn = command->command_fn;
+			break;
+	}
+	choice->type = type;
+
+	ALLOC_GROW(choices->choices, choices->nr + 1, choices->alloc);
+	choices->choices[choices->nr++] = choice;
+
+	return choice;
+}
+
+static void free_choices(struct choices *choices)
+{
+	int i;
+
+	for (i = 0; i < choices->nr; i++)
+		free(choices->choices[i]);
+	free(choices->choices);
+	choices->choices = NULL;
+	choices->nr = choices->alloc = 0;
+}
+
+void add_i_status(void)
+{
+	struct collection_status *s;
+	struct list_and_choose_options opts = { 0 };
+	struct hashmap *map;
+	struct hashmap_iter iter;
+	struct choices choices = CHOICES_INIT;
+	struct file_stat *entry;
+	const char *modified_fmt = _("%12s %12s %s");
+	const char type = 'f';
+
+	opts.header = xmalloc(sizeof(char) * (HEADER_MAXLEN + 1));
+	snprintf(opts.header, HEADER_MAXLEN + 1, modified_fmt,
+		 _("staged"), _("unstaged"), _("path"));
+
+	s = list_modified(the_repository, NULL);
+	if (s == NULL)
+		return;
+
+	map = &s->file_map;
+	hashmap_iter_init(map, &iter);
+	while ((entry = hashmap_iter_next(&iter))) {
+		add_choice(&choices, type, entry, NULL);
+	}
+
+	list_and_choose(&choices, &opts);
+
+	hashmap_free(&s->file_map, 1);
+	free(s);
+	free_choices(&choices);
+}
diff --git a/add-interactive.h b/add-interactive.h
new file mode 100644
index 0000000000..8ef3d2e82b
--- /dev/null
+++ b/add-interactive.h
@@ -0,0 +1,8 @@
+#ifndef ADD_INTERACTIVE_H
+#define ADD_INTERACTIVE_H
+
+int add_i_config(const char *var, const char *value, void *cbdata);
+
+void add_i_status(void);
+
+#endif
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 6a97f0e191..464d2245f3 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -1,6 +1,38 @@
+#include "add-interactive.h"
 #include "builtin.h"
+#include "config.h"
+#include "revision.h"
+
+static const char * const builtin_add_helper_usage[] = {
+	N_("git add-interactive--helper <command>"),
+	NULL
+};
+
+enum cmd_mode {
+	DEFAULT = 0,
+	STATUS
+};
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
 {
+	enum cmd_mode mode = DEFAULT;
+
+	struct option options[] = {
+		OPT_CMDMODE(0, "status", &mode,
+			    N_("print status information with diffstat"), STATUS),
+		OPT_END()
+	};
+
+	git_config(add_i_config, NULL);
+	argc = parse_options(argc, argv, NULL, options,
+			     builtin_add_helper_usage,
+			     PARSE_OPT_KEEP_ARGV0);
+
+	if (mode == STATUS)
+		add_i_status();
+	else
+		usage_with_options(builtin_add_helper_usage,
+				   options);
+
 	return 0;
 }
-- 
gitgitgadget

[PATCH v5 07/10] add-interactive.c: add support for list_only option

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

If list_only option is not set, (i.e. we want to pick elements
from the list, not just display them), highlight unique prefixes
of list elements and let user make a choice as shown in
prompt_help_cmd and singleton_prompt_help_cmd.

Input that is expected from user is full line.
Although that's also the case with Perl script in this
particular situation, there is also sub prompt_single_character,
which deals with single keystroke.

Ever since f7a4cea25e3ee1c8f27777bc4293dca0210fa573,
we did not use _getch() in our code base's C code, and this would
be the first user. There are portability issues with _getch()
(or getch()) that we would like to avoid.
That said, from now on, every other input will also be expected
to be full line, rather than single keystroke.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c | 378 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 373 insertions(+), 5 deletions(-)

diff --git a/add-interactive.c b/add-interactive.c
index 6bf8a90d9d..3c2e972413 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -70,18 +70,27 @@ struct choices {
 };
 #define CHOICES_INIT { NULL, 0, 0 }
 
+struct prefix_entry {
+	struct hashmap_entry e;
+	const char *name;
+	size_t prefix_length;
+	struct choice *item;
+};
+
 static int use_color = -1;
 enum color_add_i {
 	COLOR_PROMPT,
 	COLOR_HEADER,
 	COLOR_HELP,
-	COLOR_ERROR
+	COLOR_ERROR,
+	COLOR_RESET
 };
 
 static char colors[][COLOR_MAXLEN] = {
 	GIT_COLOR_BOLD_BLUE, /* Prompt */
 	GIT_COLOR_BOLD,      /* Header */
 	GIT_COLOR_BOLD_RED,  /* Help */
+	GIT_COLOR_BOLD_RED,  /* Error */
 	GIT_COLOR_RESET      /* Reset */
 };
 
@@ -102,6 +111,8 @@ static int parse_color_slot(const char *slot)
 		return COLOR_HELP;
 	if (!strcasecmp(slot, "error"))
 		return COLOR_ERROR;
+	if (!strcasecmp(slot, "reset"))
+		return COLOR_RESET;
 
 	return -1;
 }
@@ -288,14 +299,248 @@ static struct collection_status *list_modified(struct repository *r, const char
 	return s;
 }
 
+static int map_cmp(const void *unused_cmp_data,
+		   const void *entry,
+		   const void *entry_or_key,
+		   const void *unused_keydata)
+{
+	const struct choice *a = entry;
+	const struct choice *b = entry_or_key;
+	if((a->prefix_length == b->prefix_length) &&
+	  (strncmp(a->name, b->name, a->prefix_length) == 0))
+		return 0;
+	return 1;
+}
+
+static struct prefix_entry *new_prefix_entry(const char *name,
+					     size_t prefix_length,
+					     struct choice *item)
+{
+	struct prefix_entry *result = xcalloc(1, sizeof(*result));
+	result->name = name;
+	result->prefix_length = prefix_length;
+	result->item = item;
+	hashmap_entry_init(result, memhash(name, prefix_length));
+	return result;
+}
+
+static void find_unique_prefixes(struct choices *data)
+{
+	int soft_limit = 0;
+	int hard_limit = 4;
+	struct hashmap map;
+
+	hashmap_init(&map, map_cmp, NULL, 0);
+
+	for (int i = 0; i < data->nr; i++) {
+		struct prefix_entry *e = xcalloc(1, sizeof(*e));
+		struct prefix_entry *e2;
+		e->name = data->choices[i]->name;
+		e->item = data->choices[i];
+
+		for (int j = soft_limit + 1; j <= hard_limit; j++) {
+			if (!isascii(e->name[j]))
+				break;
+
+			e->prefix_length = j;
+			hashmap_entry_init(e, memhash(e->name, j));
+			e2 = hashmap_get(&map, e, NULL);
+			if (!e2) {
+				e->item->prefix_length = j;
+				hashmap_add(&map, e);
+				e = NULL;
+				break;
+			}
+
+			if (!e2->item) {
+				continue; /* non-unique prefix */
+			}
+
+			if (j != e2->item->prefix_length)
+				BUG("Hashmap entry has unexpected prefix length (%"PRIuMAX"/ != %"PRIuMAX"/)",
+				   (uintmax_t)j, (uintmax_t)e2->item->prefix_length);
+
+			/* skip common prefix */
+			for (j++; j <= hard_limit && e->name[j - 1]; j++) {
+				if (e->item->name[j - 1] != e2->item->name[j - 1])
+					break;
+				hashmap_add(&map, new_prefix_entry(e->name, j, NULL));
+			}
+			if (j <= hard_limit && e2->name[j - 1]) {
+				e2->item->prefix_length = j;
+				hashmap_add(&map, new_prefix_entry(e2->name, j, e2->item));
+			}
+			else {
+				e2->item->prefix_length = 0;
+			}
+			e2->item = NULL;
+
+			if (j <= hard_limit && e->name[j - 1]) {
+				e->item->prefix_length = j;
+				hashmap_add(&map, new_prefix_entry(e->name,
+								   e->item->prefix_length, e->item));
+				e = NULL;
+			}
+			else
+				e->item->prefix_length = 0;
+			break;
+		}
+
+		free(e);
+	}
+}
+
+static int find_unique(char *string, struct choices *data)
+{
+	int found = 0;
+	int i = 0;
+	int hit = 0;
+
+	for (i = 0; i < data->nr; i++) {
+		struct choice *item = data->choices[i];
+		hit = 0;
+		if (!strcmp(item->name, string))
+			hit = 1;
+		if (hit && found)
+			return 0;
+		if (hit)
+			found = i + 1;
+	}
+
+	return found;
+}
+
+/* filters out prefixes which have special meaning to list_and_choose() */
+static int is_valid_prefix(const char *prefix)
+{
+	regex_t *regex;
+	const char *pattern = "(\\s,)|(^-)|(^[0-9]+)";
+	int is_valid = 0;
+
+	regex = xmalloc(sizeof(*regex));
+	if (regcomp(regex, pattern, REG_EXTENDED))
+		return 0;
+
+	is_valid = prefix &&
+		   regexec(regex, prefix, 0, NULL, 0) &&
+		   strcmp(prefix, "*") &&
+		   strcmp(prefix, "?");
+	free(regex);
+	return is_valid;
+}
+
+/* return a string with the prefix highlighted */
+/* for now use square brackets; later might use ANSI colors (underline, bold) */
+static char *highlight_prefix(struct choice *item)
+{
+	struct strbuf buf;
+	struct strbuf prefix;
+	struct strbuf remainder;
+	const char *prompt_color = get_color(COLOR_PROMPT);
+	const char *reset_color = get_color(COLOR_RESET);
+	int remainder_size = strlen(item->name) - item->prefix_length;
+
+	strbuf_init(&buf, 0);
+
+	strbuf_init(&prefix, 0);
+	strbuf_add(&prefix, item->name, item->prefix_length);
+
+	strbuf_init(&remainder, 0);
+	strbuf_add(&remainder, item->name + item->prefix_length,
+		   remainder_size + 1);
+
+	if(!prefix.buf) {
+		strbuf_release(&buf);
+		strbuf_release(&prefix);
+		return remainder.buf;
+	}
+	
+	if (!is_valid_prefix(prefix.buf)) {
+		strbuf_addstr(&buf, prefix.buf);
+		strbuf_addstr(&buf, remainder.buf);
+	}
+	else if (!use_color) {
+		strbuf_addstr(&buf, "[");
+		strbuf_addstr(&buf, prefix.buf);
+		strbuf_addstr(&buf, "]");
+		strbuf_addstr(&buf, remainder.buf);
+	}
+	else {
+		strbuf_addstr(&buf, prompt_color);
+		strbuf_addstr(&buf, prefix.buf);
+		strbuf_addstr(&buf, reset_color);
+		strbuf_addstr(&buf, remainder.buf);
+	}
+
+	strbuf_release(&prefix);
+	strbuf_release(&remainder);
+
+	return buf.buf;
+}
+
+static void singleton_prompt_help_cmd(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "%s", _("Prompt help:"));
+	color_fprintf_ln(stdout, help_color, "1          - %s",
+			 _("select a numbered item"));
+	color_fprintf_ln(stdout, help_color, "foo        - %s",
+			 _("select item based on unique prefix"));
+	color_fprintf_ln(stdout, help_color, "           - %s",
+			 _("(empty) select nothing"));
+}
+
+static void prompt_help_cmd(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "%s",
+			 _("Prompt help:"));
+	color_fprintf_ln(stdout, help_color, "1          - %s",
+			 _("select a single item"));
+	color_fprintf_ln(stdout, help_color, "3-5        - %s",
+			 _("select a range of items"));
+	color_fprintf_ln(stdout, help_color, "2-3,6-9    - %s",
+			 _("select multiple ranges"));
+	color_fprintf_ln(stdout, help_color, "foo        - %s",
+			 _("select item based on unique prefix"));
+	color_fprintf_ln(stdout, help_color, "-...       - %s",
+			 _("unselect specified items"));
+	color_fprintf_ln(stdout, help_color, "*          - %s",
+			 _("choose all items"));
+	color_fprintf_ln(stdout, help_color, "           - %s",
+			 _("(empty) finish selecting"));
+}
+
 static struct choices *list_and_choose(struct choices *data,
 				       struct list_and_choose_options *opts)
 {
-	if (!data)
+	char *chosen_choices = xcalloc(data->nr, sizeof(char *));
+	struct choices *results = xcalloc(1, sizeof(*results));
+	int chosen_size = 0;
+
+	if (!data) {
+		free(chosen_choices);
+		free(results);
 		return NULL;
+	}
+	
+	if (!opts->list_only)
+		find_unique_prefixes(data);
 
+top:
 	while (1) {
 		int last_lf = 0;
+		const char *prompt_color = get_color(COLOR_PROMPT);
+		const char *error_color = get_color(COLOR_ERROR);
+		struct strbuf input = STRBUF_INIT;
+		struct strbuf choice;
+		struct strbuf token;
+		char *token_tmp;
+		regex_t *regex_dash_range;
+		regex_t *regex_number;
+		const char *pattern_dash_range;
+		const char *pattern_number;
+		const char delim[] = " ,";
 
 		if (opts->header) {
 			const char *header_color = get_color(COLOR_HEADER);
@@ -306,13 +551,17 @@ static struct choices *list_and_choose(struct choices *data,
 
 		for (int i = 0; i < data->nr; i++) {
 			struct choice *c = data->choices[i];
+			char chosen = chosen_choices[i]? '*' : ' ';
 			char *print;
 			const char *modified_fmt = _("%12s %12s %s");
 			char worktree_changes[50];
 			char index_changes[50];
 			char print_buf[100];
 
-			print = (char *)c->name;
+			if (!opts->list_only)
+				print = highlight_prefix(data->choices[i]);
+			else
+				print = (char *)c->name;
 			
 			if ((data->choices[i]->type == 'f') && (!opts->list_only_file_names)) {
 				uintmax_t worktree_added = c->u.file.worktree.added;
@@ -338,7 +587,7 @@ static struct choices *list_and_choose(struct choices *data,
 				snprintf(print, 100, "%s", print_buf);
 			}
 
-			printf(" %2d: %s", i + 1, print);
+			printf("%c%2d: %s", chosen, i + 1, print);
 
 			if ((opts->list_flat) && ((i + 1) % (opts->column_n))) {
 				printf("\t");
@@ -354,8 +603,126 @@ static struct choices *list_and_choose(struct choices *data,
 		if (!last_lf)
 			printf("\n");
 
-		return NULL;
+		if (opts->list_only)
+			return NULL;
+
+		color_fprintf(stdout, prompt_color, "%s", opts->prompt);
+		if(opts->singleton)
+			printf("> ");
+		else
+			printf(">> ");
+
+		fflush(stdout);
+		strbuf_getline(&input, stdin);
+		strbuf_trim(&input);
+
+		if (!input.buf)
+			break;
+		
+		if (!input.buf[0]) {
+			printf("\n");
+			if (opts->on_eof_fn)
+				opts->on_eof_fn();
+			break;
+		}
+
+		if (!strcmp(input.buf, "?")) {
+			opts->singleton? singleton_prompt_help_cmd() : prompt_help_cmd();
+			goto top;
+		}
+
+		token_tmp = strtok(input.buf, delim);
+		strbuf_init(&token, 0);
+		strbuf_add(&token, token_tmp, strlen(token_tmp));
+
+		while (1) {
+			int choose = 1;
+			int bottom = 0, top = 0;
+			strbuf_init(&choice, 0);
+			strbuf_addbuf(&choice, &token);
+
+			/* Input that begins with '-'; unchoose */
+			pattern_dash_range = "^-";
+			regex_dash_range = xmalloc(sizeof(*regex_dash_range));
+
+			if (regcomp(regex_dash_range, pattern_dash_range, REG_EXTENDED))
+				BUG("regex compilation for pattern %s failed",
+				   pattern_dash_range);
+			if (!regexec(regex_dash_range, choice.buf, 0, NULL, 0)) {
+				choose = 0;
+				/* remove dash from input */
+				strbuf_remove(&choice, 0, 1);
+			}
+
+			/* A range can be specified like 5-7 or 5-. */
+			pattern_dash_range = "^([0-9]+)-([0-9]*)$";
+			pattern_number = "^[0-9]+$";
+			regex_number = xmalloc(sizeof(*regex_number));
+
+			if (regcomp(regex_dash_range, pattern_dash_range, REG_EXTENDED))
+				BUG("regex compilation for pattern %s failed",
+				   pattern_dash_range);
+			if (regcomp(regex_number, pattern_number, REG_EXTENDED))
+				BUG("regex compilation for pattern %s failed", pattern_number);
+
+			if (!regexec(regex_dash_range, choice.buf, 0, NULL, 0)) {
+				const char delim_dash[] = "-";
+				char *num = NULL;
+				num = strtok(choice.buf, delim_dash);
+				bottom = atoi(num);
+				num = strtok(NULL, delim_dash);
+				top = num? atoi(num) : (1 + data->nr);
+			}
+			else if (!regexec(regex_number, choice.buf, 0, NULL, 0))
+				bottom = top = atoi(choice.buf);
+			else if (!strcmp(choice.buf, "*")) {
+				bottom = 1;
+				top = 1 + data->nr;
+			}
+			else {
+				bottom = top = find_unique(choice.buf, data);
+				if (!bottom) {
+					color_fprintf_ln(stdout, error_color, _("Huh (%s)?"), choice.buf);
+					goto top;
+				}
+			}
+
+			if (opts->singleton && bottom != top) {
+				color_fprintf_ln(stdout, error_color, _("Huh (%s)?"), choice.buf);
+				goto top;
+			}
+
+			for (int i = bottom - 1; i <= top - 1; i++) {
+				if (data->nr <= i || i < 0)
+					continue;
+				chosen_choices[i] = choose;
+				if (choose == 1)
+					chosen_size++;
+			}
+
+			strbuf_release(&token);
+			strbuf_release(&choice);
+
+			token_tmp = strtok(NULL, delim);
+			if (!token_tmp)
+				break;
+			strbuf_init(&token, 0);
+			strbuf_add(&token, token_tmp, strlen(token_tmp));
+		}
+
+		if ((opts->immediate) || !(strcmp(choice.buf, "*")))
+			break;
 	}
+
+	for (int i = 0; i < data->nr; i++) {
+		if (chosen_choices[i]) {
+			ALLOC_GROW(results->choices, results->nr + 1, results->alloc);
+			results->choices[results->nr++] = data->choices[i];
+		}
+	}
+
+	free(chosen_choices);
+	return results;
 }
 
 static struct choice *make_choice(const char *name )
@@ -412,6 +779,7 @@ void add_i_status(void)
 	const char *modified_fmt = _("%12s %12s %s");
 	const char type = 'f';
 
+	opts.list_only = 1;
 	opts.header = xmalloc(sizeof(char) * (HEADER_MAXLEN + 1));
 	snprintf(opts.header, HEADER_MAXLEN + 1, modified_fmt,
 		 _("staged"), _("unstaged"), _("path"));
-- 
gitgitgadget

[PATCH v5 08/10] add-interactive.c: implement show-help command

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Implement show-help command in add-interactive.c and use it in
builtin add--helper.c.

Use command name "show-help" instead of "help": add--helper is
builtin, hence add--helper --help would be intercepted by
handle_builtin and re-routed to the help command, without ever
calling cmd_add__helper().

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 add-interactive.c     | 17 +++++++++++++++++
 add-interactive.h     |  2 ++
 builtin/add--helper.c |  7 ++++++-
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/add-interactive.c b/add-interactive.c
index 3c2e972413..ad05bf7e1f 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -800,3 +800,20 @@ void add_i_status(void)
 	free(s);
 	free_choices(&choices);
 }
+
+void add_i_show_help(void)
+{
+	const char *help_color = get_color(COLOR_HELP);
+	color_fprintf_ln(stdout, help_color, "status        - %s",
+			 _("show paths with changes"));
+	color_fprintf_ln(stdout, help_color, "update        - %s",
+			 _("add working tree state to the staged set of changes"));
+	color_fprintf_ln(stdout, help_color, "revert        - %s",
+			 _("revert staged set of changes back to the HEAD version"));
+	color_fprintf_ln(stdout, help_color, "patch         - %s",
+			 _("pick hunks and update selectively"));
+	color_fprintf_ln(stdout, help_color, "diff          - %s",
+			 _("view diff between HEAD and index"));
+	color_fprintf_ln(stdout, help_color, "add untracked - %s",
+			 _("add contents of untracked files to the staged set of changes"));
+}
diff --git a/add-interactive.h b/add-interactive.h
index 8ef3d2e82b..ddeedd3a33 100644
--- a/add-interactive.h
+++ b/add-interactive.h
@@ -5,4 +5,6 @@ int add_i_config(const char *var, const char *value, void *cbdata);
 
 void add_i_status(void);
 
+void add_i_show_help(void);
+
 #endif
diff --git a/builtin/add--helper.c b/builtin/add--helper.c
index 464d2245f3..1fe64bc7fb 100644
--- a/builtin/add--helper.c
+++ b/builtin/add--helper.c
@@ -10,7 +10,8 @@ static const char * const builtin_add_helper_usage[] = {
 
 enum cmd_mode {
 	DEFAULT = 0,
-	STATUS
+	STATUS,
+	HELP
 };
 
 int cmd_add__helper(int argc, const char **argv, const char *prefix)
@@ -20,6 +21,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_CMDMODE(0, "status", &mode,
 			    N_("print status information with diffstat"), STATUS),
+		OPT_CMDMODE(0, "show-help", &mode,
+			    N_("show help"), HELP),
 		OPT_END()
 	};
 
@@ -30,6 +33,8 @@ int cmd_add__helper(int argc, const char **argv, const char *prefix)
 
 	if (mode == STATUS)
 		add_i_status();
+	else if (mode == HELP)
+		add_i_show_help();
 	else
 		usage_with_options(builtin_add_helper_usage,
 				   options);
-- 
gitgitgadget

[PATCH v5 10/10] add--interactive.perl: use add--helper --show-help for help_cmd

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Change help_cmd sub in git-add--interactive.perl to use
show-help command from builtin add--helper.

If an error occurs, it will be reported, but the Perl script will
not exit, since the add--helper is called within an eval block.

Just like the change where the Perl script calls the add--helper
to print the numstat, also here we forgo adding a regression test:
the Perl script is on its way out (and this patch is part of that journey).

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 git-add--interactive.perl | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index c2c6b4d5e3..88b7be6602 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1718,16 +1718,8 @@ sub quit_cmd {
 }
 
 sub help_cmd {
-# TRANSLATORS: please do not translate the command names
-# 'status', 'update', 'revert', etc.
-	print colored $help_color, __ <<'EOF' ;
-status        - show paths with changes
-update        - add working tree state to the staged set of changes
-revert        - revert staged set of changes back to the HEAD version
-patch         - pick hunks and update selectively
-diff          - view diff between HEAD and index
-add untracked - add contents of untracked files to the staged set of changes
-EOF
+	my @help_cmd = ("git", "add--helper", "--show-help");
+	!system(@help_cmd) or die "@help_cmd exited with code $?";
 }
 
 sub process_args {
-- 
gitgitgadget

[PATCH v5 09/10] t3701-add-interactive: test add_i_show_help()

[Slavica Djukic via GitGitGadget]

From: Slavica Djukic <slawica92@hotmail.com>

Add test to t3701-add-interactive to verify that add_i_show_help()
outputs expected content.
Also, add it before changing git-add--interactive.perl's help_cmd
to demonstrate that there are no changes introduced by the
conversion to C.

Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
to force colored output on Windows.

Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
---
 t/t3701-add-interactive.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 65dfbc033a..91aaef2932 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -639,4 +639,28 @@ test_expect_success 'add -p patch editing works with pathological context lines'
 	test_cmp expected-2 actual
 '
 
+test_expect_success 'show help from add--helper' '
+	git reset --hard &&
+	cat >expect <<-EOF &&
+
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>> <BOLD;RED>status        - show paths with changes<RESET>
+	<BOLD;RED>update        - add working tree state to the staged set of changes<RESET>
+	<BOLD;RED>revert        - revert staged set of changes back to the HEAD version<RESET>
+	<BOLD;RED>patch         - pick hunks and update selectively<RESET>
+	<BOLD;RED>diff          - view diff between HEAD and index<RESET>
+	<BOLD;RED>add untracked - add contents of untracked files to the staged set of changes<RESET>
+	<BOLD>*** Commands ***<RESET>
+	  1: <BOLD;BLUE>s<RESET>tatus	  2: <BOLD;BLUE>u<RESET>pdate	  3: <BOLD;BLUE>r<RESET>evert	  4: <BOLD;BLUE>a<RESET>dd untracked
+	  5: <BOLD;BLUE>p<RESET>atch	  6: <BOLD;BLUE>d<RESET>iff	  7: <BOLD;BLUE>q<RESET>uit	  8: <BOLD;BLUE>h<RESET>elp
+	<BOLD;BLUE>What now<RESET>>$SP
+	Bye.
+	EOF
+	test_write_lines h | GIT_PAGER_IN_USE=true TERM=vt100 git add -i >actual.colored &&
+	test_decode_color <actual.colored >actual &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
gitgitgadget

Re: [PATCH v5 01/10] diff: export diffstat interface

[Junio C Hamano]

"Daniel Ferreira via GitGitGadget" <gitgitgadget@gmail.com> writes:

> @@ -6001,12 +5985,7 @@ void diff_flush(struct diff_options *options)
>  	    dirstat_by_line) {
>  		struct diffstat_t diffstat;
>  
> -		memset(&diffstat, 0, sizeof(struct diffstat_t));
> -		for (i = 0; i < q->nr; i++) {
> -			struct diff_filepair *p = q->queue[i];
> -			if (check_pair_status(p))
> -				diff_flush_stat(p, options, &diffstat);
> -		}
> +		compute_diffstat(options, &diffstat);
>  		if (output_format & DIFF_FORMAT_NUMSTAT)
>  			show_numstat(&diffstat, options);
>  		if (output_format & DIFF_FORMAT_DIFFSTAT)

In the post-context of this hunk there are series of "if we are
showing this kind of diffstat, pass &diffstat to a helper that shows
it" calls, and this piece of code itself is guarded by "if we are
showing any of these kinds of diffstat, enter this block".  So a
helper function that computes necessary data in &diffstat upfront
does make sense and makes the code readable quite a lot.

But...


> +void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
> +{
> +	int i;
> +	struct diff_queue_struct *q = &diff_queued_diff;

... as a reusable helper, it would make a saner API if you did not
to hardcode the dependency to the singleton diff_queued_diff
(i.e. instead, pass a pointer to struct diff_queue_struct as a
parameter---the caller has it as 'q' at the callsite).

Other than that, makes sense to me; thanks.

Here is a meta question, which is mostly meant to those who use
gitgitgadget@.  The person who wanted to send this copy of the patch
this time (i.e. Slavica, not Daniel) is not shown anywhere on the
header of the e-mail, so the response to the message will not go to
Slavica at all, even though it probably is visible by monitoring
where gitgitgadget@ delivers (i.e. the PR comments).

Is that desirable as a reviewee?  I manually added Slavica's address
taken from the S-o-b: line to this response just in case, but if it
is not desirable, I'll stop doing so.

Thanks.

Re: [PATCH v5 02/10] add--helper: create builtin helper for interactive add

[Junio C Hamano]

"Daniel Ferreira via GitGitGadget" <gitgitgadget@gmail.com> writes:

> diff --git a/git.c b/git.c
> index 2dd588674f..cb42591f37 100644
> --- a/git.c
> +++ b/git.c
> @@ -444,6 +444,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
>  
>  static struct cmd_struct commands[] = {
>  	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
> +	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
>  	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
>  	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
>  	{ "apply", cmd_apply, RUN_SETUP_GENTLY },

When adding a more complex replacement command we often cannot write
RUN_SETUP nor NEED_WORK_TREE here and instead do the job ourselves
in cmd_ourcommand() the hard way.  But because this one is only for
helping "add -i", we can let the git.c::run_builtin() aka "git
potty" do the hard part, which is very nice.

Makes sense so far.

Thanks.

Re: [PATCH v5 03/10] add-interactive.c: implement list_modified

[Junio C Hamano]

"Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:

> diff --git a/add-interactive.c b/add-interactive.c
> new file mode 100644
> index 0000000000..7d096207d4
> --- /dev/null
> +++ b/add-interactive.c
> @@ -0,0 +1,188 @@
> +#include "cache.h"
> +#include "commit.h"
> +#include "color.h"
> +#include "config.h"
> +#include "diffcore.h"
> +#include "revision.h"
> +
> +enum collection_phase {
> +	WORKTREE,
> +	INDEX
> +};
> +
> +struct file_stat {
> +	struct hashmap_entry ent;
> +	struct {
> +		uintmax_t added, deleted;
> +	} index, worktree;
> +	char name[FLEX_ARRAY];
> +};
> +
> +struct collection_status {
> +	enum collection_phase phase;
> +
> +	const char *reference;
> +	struct pathspec pathspec;
> +
> +	struct hashmap file_map;
> +};
> +
> +static int hash_cmp(const void *unused_cmp_data, const void *entry,
> +		    const void *entry_or_key, const void *keydata)
> +{
> +	const struct file_stat *e1 = entry, *e2 = entry_or_key;
> +	const char *name = keydata ? keydata : e2->name;
> +
> +	return strcmp(e1->name, name);
> +}

This one is used with hashmap API, which gives unfortunate name
"cmp_fn" to its callback, which does not necessarily need to
compare.  It only needs to say "are they different (yes/no)?"
without having to order them (iow, it would not break anything if
the above is changed to return strcmp(name, e1->name)).

Rather than naming the callback after the name of the API that calls
it (i.e. "hash"), it would make it more descriptive if it were named
after what is being compared for equality, in this case, pathname.
Perhaps "pathname_equal()" or something?

> +static int alphabetical_cmp(const void *a, const void *b)
> +{
> +	struct file_stat *f1 = *((struct file_stat **)a);
> +	struct file_stat *f2 = *((struct file_stat **)b);
> +
> +	return strcmp(f1->name, f2->name);
> +}

This one is used with qsort(), and there are two things you may want
the function name to tell the readers.  "what is compared" and "how
it is compared".  Alphabetical is a bit fuzzy (different people sort
"a.txt", "A.txt", and "b.txt" in different order) and it gives a
piece of information of secondary importance (i.e. it only starts to
make sense after you know you are ordering pathnames), so perhaps
"pathname_cmp()" or something may be a better name.

> +
> +static void collect_changes_cb(struct diff_queue_struct *q,
> +			       struct diff_options *options,
> +			       void *data)
> +{
> +	struct collection_status *s = data;
> +	struct diffstat_t stat = { 0 };
> +	int i;
> +
> +	if (!q->nr)
> +		return;
> +
> +	compute_diffstat(options, &stat);

Remember what I said on patch 01/10?  This callback function is
designed to take arbitrary diff_queue_struct q as its parameter and
work on it, but compute_diffstat() is misdesigned and cannot work on
anything but the singleton diff_queued_diff, which is an impedance
mismatch that can easily be corrected by going back to 01/10 and
fixing it.

> +	for (i = 0; i < stat.nr; i++) {
> +		struct file_stat *entry;
> +		const char *name = stat.files[i]->name;
> +		unsigned int hash = strhash(name);
> +
> +		entry = hashmap_get_from_hash(&s->file_map, hash, name);
> +		if (!entry) {
> +			FLEX_ALLOC_STR(entry, name, name);
> +			hashmap_entry_init(entry, hash);
> +			hashmap_add(&s->file_map, entry);
> +		}

The path may already be in the collection_status.file_map from the
previous run when "diff-index --cached" is run, in which case we avoid
adding it twice, which makes sense.

> +		if (s->phase == WORKTREE) {
> +			entry->worktree.added = stat.files[i]->added;
> +			entry->worktree.deleted = stat.files[i]->deleted;
> +		} else if (s->phase == INDEX) {
> +			entry->index.added = stat.files[i]->added;
> +			entry->index.deleted = stat.files[i]->deleted;
> +		}

As the set of phases will not going to grow, not having the final
'else BUG("phase is neither WORKTREE nor INDEX");' here is OK.

But stepping back a bit, if we know we will not grow the phases,
then it may be simpler *and* equally descriptive to rename .phase
field to a boolean ".collecting_from_index" that literally means
"are we collecting from the index?" and that way we can also get rid
of the enum.

> +	}
> +}
> +
> +static void collect_changes_worktree(struct collection_status *s)
> +{
> +	struct rev_info rev;
> +
> +	s->phase = WORKTREE;
> +
> +	init_revisions(&rev, NULL);
> +	setup_revisions(0, NULL, &rev, NULL);
> +
> +	rev.max_count = 0;

The convention to (ab)use the max_count field to specify the
unmerged stage, against which the working tree file is compared for
an unmerged path, is one of the older quirks of the run_diff_files()
API.  "git diff-files" itself when running cmd_diff_files() leaves
rev.max_count untouched to get a normal output (as opposed to the
case when it is told to do --base/--ours/--theirs), so it ends up
passing -1 in this field in such a case.

This explicit assignment to 0 must be explained with in-code comment
why we want to do so.

> +	rev.diffopt.flags.ignore_dirty_submodules = 1;

OK, this matches what "sub list_modified" does.

> +	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
> +	rev.diffopt.format_callback = collect_changes_cb;
> +	rev.diffopt.format_callback_data = s;
> +	run_diff_files(&rev, 0);
> +}
> +
> +static void collect_changes_index(struct collection_status *s)
> +{
> +	struct rev_info rev;
> +	struct setup_revision_opt opt = { 0 };
> +
> +	s->phase = INDEX;
> +
> +	init_revisions(&rev, NULL);
> +	opt.def = s->reference;
> +	setup_revisions(0, NULL, &rev, &opt);
> +
> +	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
> +	rev.diffopt.format_callback = collect_changes_cb;
> +	rev.diffopt.format_callback_data = s;
> +
> +	run_diff_index(&rev, 1);
> +}
> +
> +static int is_inital_commit(void)
> +{
> +	struct object_id sha1;
> +	if (get_oid("HEAD", &sha1))

Using the newer get_oid() API (as opposed to get_sha1() API) while
calling the variable that receives its result "sha1" is an
oxymoron.  Most users of the API call it "oid", I think.

> +		return 1;
> +	return 0;
> +}

inital???

Grep for "unborn" in the codebase.  It probably makes sense to call
it on_unborn_branch() instead.

	static int on_unborn_branch(void)
	{
		struct object_id oid;
		return !!get_oid("HEAD", &oid);
	}

Eventually, the users of "unborn" in sequencer.c and builtin/reset.c
may want to share the implementation but the helper is so small that
we probably should not worry about it until the topic is done and
leave it for a later clean-up.

> +static const char *get_diff_reference(void)
> +{
> +	if(is_inital_commit())

Style.  Do not forget SP between "if" and "(".

> +		return empty_tree_oid_hex();
> +	return "HEAD";
> +}

Although probably

	return on_unborn_branch() ? empty_tree_oid_hex() : "HEAD";

is clear enough.

> +static void filter_files(const char *filter, struct hashmap *file_map,
> +			 struct file_stat **files)
> +{
> +
> +	for (int i = 0; i < hashmap_get_size(file_map); i++) {

The declaration of "int i" there is one of the C99ism we do not use,
IIRC ("git grep 'for (int ' \*.c" comes up empty).

> +		struct file_stat *f = files[i];
> +
> +		if ((!(f->worktree.added || f->worktree.deleted)) &&
> +		   (!strcmp(filter, "file-only")))
> +				hashmap_remove(file_map, f, NULL);
> +
> +		if ((!(f->index.added || f->index.deleted)) &&
> +		   (!strcmp(filter, "index-only")))
> +				hashmap_remove(file_map, f, NULL);
> +	}

As part of the "interactive" machinery, obvious inefficiency in the
code may not matter that much, but having to make exact string
comparison for an unmodified parameter twice for each iteration does
not look like showing a good taste.

What is the earliest time the code can decide that it is asked to do
a "file-only" filtering?  What I am trying to get at is that if we
know early enough, instead of grabbing outputs from "diff-files" and
"diff-index --cached", only to drop such entries that do not have
output in "diff-files", we could run only "diff-index --cached"
without spending any cycle to run "diff-files" in the first place.

Even if such a reorganizing of the callflow is impossible (I didn't
check), at least a micro optimization would be:

	int i;
	int file_only = !strcmp(filter, "file-only");
	int index_only = !strcmp(filter, "index-only");

	for (i = 0; i < hashmap_get_size(file_map), i++) {
		struct file_stat *f = files[i];
		if (file_only && !(f->worktree.added || f->worktree.deleted))
			hashmap_remove(file_map, f, NULL);
		...
	}



> +}
> +
> +static struct collection_status *list_modified(struct repository *r, const char *filter)
> +{
> +	int i = 0;
> +	struct collection_status *s = xcalloc(1, sizeof(*s));
> +	struct hashmap_iter iter;
> +	struct file_stat **files;
> +	struct file_stat *entry;
> +
> +	if (repo_read_index(r) < 0) {
> +		printf("\n");
> +		return NULL;
> +	}
> +
> +	s->reference = get_diff_reference();
> +	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
> +
> +	collect_changes_worktree(s);
> +	collect_changes_index(s);
> +
> +	if (hashmap_get_size(&s->file_map) < 1) {
> +		printf("\n");
> +		return NULL;
> +	}
> +
> +	hashmap_iter_init(&s->file_map, &iter);
> +
> +	files = xcalloc(hashmap_get_size(&s->file_map), sizeof(struct file_stat *));
> +	while ((entry = hashmap_iter_next(&iter))) {
> +		files[i++] = entry;
> +	}
> +	QSORT(files, hashmap_get_size(&s->file_map), alphabetical_cmp);
> +
> +	if (filter)
> +		filter_files(filter, &s->file_map, files);

Ahh, this answers my previous question, no?  The "filter" parameter
given to this function will never change, so we could inspect it
even before we call collect_chagnes_{worktree,index}().  If the
caller says "I want to see only the paths that appear in the
diff-files output", there is no need to call collect_changes_index()
at all, no?

> +
> +	free(files);
> +	return s;
> +}

Re: [PATCH v5 03/10] add-interactive.c: implement list_modified

[Junio C Hamano]

Junio C Hamano <gitster@pobox.com> writes:

A few things I missed in the previous message.

>> +	for (i = 0; i < stat.nr; i++) {
>> +		struct file_stat *entry;
>> +		const char *name = stat.files[i]->name;
>> +		unsigned int hash = strhash(name);
>> +
>> +		entry = hashmap_get_from_hash(&s->file_map, hash, name);
>> +		if (!entry) {
>> +			FLEX_ALLOC_STR(entry, name, name);
>> +			hashmap_entry_init(entry, hash);
>> +			hashmap_add(&s->file_map, entry);
>> +		}
>
> The path may already be in the collection_status.file_map from the
> previous run when "diff-index --cached" is run, in which case we avoid
> adding it twice, which makes sense.
>
>> +		if (s->phase == WORKTREE) {
>> +			entry->worktree.added = stat.files[i]->added;
>> +			entry->worktree.deleted = stat.files[i]->deleted;
>> +		} else if (s->phase == INDEX) {
>> +			entry->index.added = stat.files[i]->added;
>> +			entry->index.deleted = stat.files[i]->deleted;
>> +		}
>
> As the set of phases will not going to grow, not having the final
> 'else BUG("phase is neither WORKTREE nor INDEX");' here is OK.
>
> But stepping back a bit, if we know we will not grow the phases,
> then it may be simpler *and* equally descriptive to rename .phase
> field to a boolean ".collecting_from_index" that literally means
> "are we collecting from the index?" and that way we can also get rid
> of the enum.

... so that this can become

	if (s->collecting_from_index) {
		entry->index.added = stat.files[i]->added;
		entry->index.deleted = stat.files[i]->deleted;
	} else {
		...
	}

without "else if" and without having to worry about "what if phase
is neither?".

> Grep for "unborn" in the codebase.  It probably makes sense to call
> it on_unborn_branch() instead.
>
> 	static int on_unborn_branch(void)
> 	{
> 		struct object_id oid;
> 		return !!get_oid("HEAD", &oid);
> 	}
>
> Eventually, the users of "unborn" in sequencer.c and builtin/reset.c
> may want to share the implementation but the helper is so small that
> we probably should not worry about it until the topic is done and
> leave it for a later clean-up.

And before such a clean-up happens, the implementation of the helper
would want to be improved.  "Does 'rev-parse --verify HEAD' work?"
was an easiest way to see if we are on an unborn branch from a
script that works most of the time, but as we are rewriting it in C,
we should use the more direct and correct API to see if "HEAD" is
a symref, and if it points at a branch that does not yet exist,
which is available in the refs API as resolve_ref_unsafe().

One issue with lazy use of get_oid("HEAD") is that the function
dwims and tries to find HEAD in common hierarchies like
.git/refs/heads/HEAD etc. when .git/HEAD does not work.  We do not
want such a dwimmery when seeing "are we on an unborn branch?".

>> +static struct collection_status *list_modified(struct repository *r, const char *filter)
>> +{
>> +	int i = 0;
>> +	struct collection_status *s = xcalloc(1, sizeof(*s));
>> +	struct hashmap_iter iter;
>> +	struct file_stat **files;
>> +	struct file_stat *entry;
>> +
>> +	if (repo_read_index(r) < 0) {
>> +		printf("\n");
>> +		return NULL;
>> +	}
>> +
>> +	s->reference = get_diff_reference();
>> +	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
>> +
>> +	collect_changes_worktree(s);
>> +	collect_changes_index(s);
>> +
>> +	if (hashmap_get_size(&s->file_map) < 1) {
>> +		printf("\n");
>> +		return NULL;
>> +	}

The non-error codepath of this function does not do any output, but
we see two "just emit newline" before returning NUULL to signal an
error to the caller" in the above.  Such a printing from this level
in the callchain (although we haven't seen callers of this function
yet at this point in the series) is wrong.  Presumably, the caller, 
when it obtains a non-NULL 's', does something useful and maybe as a
part of the "useful" thing prints something to the standard output.
Then the caller is also responsible for handling a NULL return.  I.e.
upon seeing such a NULL collection status, if the party that invoked
the caller wants to see a single empty line for whatever reason (which
in turn is a questionable practice, if you ask me, but at this point
in the series we haven't seen what that invoker is doing, so for now
lets assume that it is sane to want to see an empty line), the caller
should do the putchar('\n').

Also, these two "return NULL" leaks 's'.

Re: [PATCH v5 00/10] Turn git add-i into built-in

[Junio C Hamano]

"Slavica Đukić via GitGitGadget"  <gitgitgadget@gmail.com> writes:

> This is the first version of a patch series to start porting
> git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
> a head start:
> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u
>
> Changes since v4:
>
>  * rename print_modified to list_modifed
>  * the big change was implementing list_and_choose, which resulted in code
>    refactoring, i.e. separating list_modified and status_cmd and making
>    status_cmd use both list_modified and list_and_choose
>  * implement struct choice instead of struct stuff_item as main data
>    structure for list_and_choose
>  * introduce list_only option and implement support for !list_only users
>  * introduce highlighting of unique prefixes
>
> Note that authorship handling is slightly changed. In some of the commits, I
> used Original-patch-by instead of listing Daniel Ferreira as author.

Sounds good to me.

Re: [PATCH v5 01/10] diff: export diffstat interface

[Slavica Djukic]

Hello Junio,

Thank you for suggestions and for taking time to look at
this patch series.

On 21-Feb-19 6:53 PM, Junio C Hamano wrote:
> "Daniel Ferreira via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> @@ -6001,12 +5985,7 @@ void diff_flush(struct diff_options *options)
>>   	    dirstat_by_line) {
>>   		struct diffstat_t diffstat;
>>   
>> -		memset(&diffstat, 0, sizeof(struct diffstat_t));
>> -		for (i = 0; i < q->nr; i++) {
>> -			struct diff_filepair *p = q->queue[i];
>> -			if (check_pair_status(p))
>> -				diff_flush_stat(p, options, &diffstat);
>> -		}
>> +		compute_diffstat(options, &diffstat);
>>   		if (output_format & DIFF_FORMAT_NUMSTAT)
>>   			show_numstat(&diffstat, options);
>>   		if (output_format & DIFF_FORMAT_DIFFSTAT)
> In the post-context of this hunk there are series of "if we are
> showing this kind of diffstat, pass &diffstat to a helper that shows
> it" calls, and this piece of code itself is guarded by "if we are
> showing any of these kinds of diffstat, enter this block".  So a
> helper function that computes necessary data in &diffstat upfront
> does make sense and makes the code readable quite a lot.
>
> But...
>
>
>> +void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat)
>> +{
>> +	int i;
>> +	struct diff_queue_struct *q = &diff_queued_diff;
> ... as a reusable helper, it would make a saner API if you did not
> to hardcode the dependency to the singleton diff_queued_diff
> (i.e. instead, pass a pointer to struct diff_queue_struct as a
> parameter---the caller has it as 'q' at the callsite).
>
> Other than that, makes sense to me; thanks.
>
> Here is a meta question, which is mostly meant to those who use
> gitgitgadget@.  The person who wanted to send this copy of the patch
> this time (i.e. Slavica, not Daniel) is not shown anywhere on the
> header of the e-mail, so the response to the message will not go to
> Slavica at all, even though it probably is visible by monitoring
> where gitgitgadget@ delivers (i.e. the PR comments).
>
> Is that desirable as a reviewee?  I manually added Slavica's address
> taken from the S-o-b: line to this response just in case, but if it
> is not desirable, I'll stop doing so.


Since gitgitgadget puts reviewer's e-mails in PR comments and send
e-mails (to me) as well, you don't need to add manually my address.

But thanks for thinking about this and doing it just in case
I don't get e-mails.


>
> Thanks.
>

Re: [PATCH v5 03/10] add-interactive.c: implement list_modified

[Slavica Djukic]

On 21-Feb-19 8:06 PM, Junio C Hamano wrote:
> "Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> diff --git a/add-interactive.c b/add-interactive.c
>> new file mode 100644
>> index 0000000000..7d096207d4
>> --- /dev/null
>> +++ b/add-interactive.c
>> @@ -0,0 +1,188 @@
>> +#include "cache.h"
>> +#include "commit.h"
>> +#include "color.h"
>> +#include "config.h"
>> +#include "diffcore.h"
>> +#include "revision.h"
>> +
>> +enum collection_phase {
>> +	WORKTREE,
>> +	INDEX
>> +};
>> +
>> +struct file_stat {
>> +	struct hashmap_entry ent;
>> +	struct {
>> +		uintmax_t added, deleted;
>> +	} index, worktree;
>> +	char name[FLEX_ARRAY];
>> +};
>> +
>> +struct collection_status {
>> +	enum collection_phase phase;
>> +
>> +	const char *reference;
>> +	struct pathspec pathspec;
>> +
>> +	struct hashmap file_map;
>> +};
>> +
>> +static int hash_cmp(const void *unused_cmp_data, const void *entry,
>> +		    const void *entry_or_key, const void *keydata)
>> +{
>> +	const struct file_stat *e1 = entry, *e2 = entry_or_key;
>> +	const char *name = keydata ? keydata : e2->name;
>> +
>> +	return strcmp(e1->name, name);
>> +}
> This one is used with hashmap API, which gives unfortunate name
> "cmp_fn" to its callback, which does not necessarily need to
> compare.  It only needs to say "are they different (yes/no)?"
> without having to order them (iow, it would not break anything if
> the above is changed to return strcmp(name, e1->name)).
>
> Rather than naming the callback after the name of the API that calls
> it (i.e. "hash"), it would make it more descriptive if it were named
> after what is being compared for equality, in this case, pathname.
> Perhaps "pathname_equal()" or something?
>
>> +static int alphabetical_cmp(const void *a, const void *b)
>> +{
>> +	struct file_stat *f1 = *((struct file_stat **)a);
>> +	struct file_stat *f2 = *((struct file_stat **)b);
>> +
>> +	return strcmp(f1->name, f2->name);
>> +}
> This one is used with qsort(), and there are two things you may want
> the function name to tell the readers.  "what is compared" and "how
> it is compared".  Alphabetical is a bit fuzzy (different people sort
> "a.txt", "A.txt", and "b.txt" in different order) and it gives a
> piece of information of secondary importance (i.e. it only starts to
> make sense after you know you are ordering pathnames), so perhaps
> "pathname_cmp()" or something may be a better name.
>
>> +
>> +static void collect_changes_cb(struct diff_queue_struct *q,
>> +			       struct diff_options *options,
>> +			       void *data)
>> +{
>> +	struct collection_status *s = data;
>> +	struct diffstat_t stat = { 0 };
>> +	int i;
>> +
>> +	if (!q->nr)
>> +		return;
>> +
>> +	compute_diffstat(options, &stat);
> Remember what I said on patch 01/10?  This callback function is
> designed to take arbitrary diff_queue_struct q as its parameter and
> work on it, but compute_diffstat() is misdesigned and cannot work on
> anything but the singleton diff_queued_diff, which is an impedance
> mismatch that can easily be corrected by going back to 01/10 and
> fixing it.
>
>> +	for (i = 0; i < stat.nr; i++) {
>> +		struct file_stat *entry;
>> +		const char *name = stat.files[i]->name;
>> +		unsigned int hash = strhash(name);
>> +
>> +		entry = hashmap_get_from_hash(&s->file_map, hash, name);
>> +		if (!entry) {
>> +			FLEX_ALLOC_STR(entry, name, name);
>> +			hashmap_entry_init(entry, hash);
>> +			hashmap_add(&s->file_map, entry);
>> +		}
> The path may already be in the collection_status.file_map from the
> previous run when "diff-index --cached" is run, in which case we avoid
> adding it twice, which makes sense.
>
>> +		if (s->phase == WORKTREE) {
>> +			entry->worktree.added = stat.files[i]->added;
>> +			entry->worktree.deleted = stat.files[i]->deleted;
>> +		} else if (s->phase == INDEX) {
>> +			entry->index.added = stat.files[i]->added;
>> +			entry->index.deleted = stat.files[i]->deleted;
>> +		}
> As the set of phases will not going to grow, not having the final
> 'else BUG("phase is neither WORKTREE nor INDEX");' here is OK.
>
> But stepping back a bit, if we know we will not grow the phases,
> then it may be simpler *and* equally descriptive to rename .phase
> field to a boolean ".collecting_from_index" that literally means
> "are we collecting from the index?" and that way we can also get rid
> of the enum.
>
>> +	}
>> +}
>> +
>> +static void collect_changes_worktree(struct collection_status *s)
>> +{
>> +	struct rev_info rev;
>> +
>> +	s->phase = WORKTREE;
>> +
>> +	init_revisions(&rev, NULL);
>> +	setup_revisions(0, NULL, &rev, NULL);
>> +
>> +	rev.max_count = 0;
> The convention to (ab)use the max_count field to specify the
> unmerged stage, against which the working tree file is compared for
> an unmerged path, is one of the older quirks of the run_diff_files()
> API.  "git diff-files" itself when running cmd_diff_files() leaves
> rev.max_count untouched to get a normal output (as opposed to the
> case when it is told to do --base/--ours/--theirs), so it ends up
> passing -1 in this field in such a case.
>
> This explicit assignment to 0 must be explained with in-code comment
> why we want to do so.
>
>> +	rev.diffopt.flags.ignore_dirty_submodules = 1;
> OK, this matches what "sub list_modified" does.
>
>> +	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
>> +	rev.diffopt.format_callback = collect_changes_cb;
>> +	rev.diffopt.format_callback_data = s;
>> +	run_diff_files(&rev, 0);
>> +}
>> +
>> +static void collect_changes_index(struct collection_status *s)
>> +{
>> +	struct rev_info rev;
>> +	struct setup_revision_opt opt = { 0 };
>> +
>> +	s->phase = INDEX;
>> +
>> +	init_revisions(&rev, NULL);
>> +	opt.def = s->reference;
>> +	setup_revisions(0, NULL, &rev, &opt);
>> +
>> +	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
>> +	rev.diffopt.format_callback = collect_changes_cb;
>> +	rev.diffopt.format_callback_data = s;
>> +
>> +	run_diff_index(&rev, 1);
>> +}
>> +
>> +static int is_inital_commit(void)
>> +{
>> +	struct object_id sha1;
>> +	if (get_oid("HEAD", &sha1))
> Using the newer get_oid() API (as opposed to get_sha1() API) while
> calling the variable that receives its result "sha1" is an
> oxymoron.  Most users of the API call it "oid", I think.
>
>> +		return 1;
>> +	return 0;
>> +}
> inital???
>
> Grep for "unborn" in the codebase.  It probably makes sense to call
> it on_unborn_branch() instead.
>
> 	static int on_unborn_branch(void)
> 	{
> 		struct object_id oid;
> 		return !!get_oid("HEAD", &oid);
> 	}
>
> Eventually, the users of "unborn" in sequencer.c and builtin/reset.c
> may want to share the implementation but the helper is so small that
> we probably should not worry about it until the topic is done and
> leave it for a later clean-up.
>
>> +static const char *get_diff_reference(void)
>> +{
>> +	if(is_inital_commit())
> Style.  Do not forget SP between "if" and "(".
>
>> +		return empty_tree_oid_hex();
>> +	return "HEAD";
>> +}
> Although probably
>
> 	return on_unborn_branch() ? empty_tree_oid_hex() : "HEAD";
>
> is clear enough.
>
>> +static void filter_files(const char *filter, struct hashmap *file_map,
>> +			 struct file_stat **files)
>> +{
>> +
>> +	for (int i = 0; i < hashmap_get_size(file_map); i++) {
> The declaration of "int i" there is one of the C99ism we do not use,
> IIRC ("git grep 'for (int ' \*.c" comes up empty).
>
>> +		struct file_stat *f = files[i];
>> +
>> +		if ((!(f->worktree.added || f->worktree.deleted)) &&
>> +		   (!strcmp(filter, "file-only")))
>> +				hashmap_remove(file_map, f, NULL);
>> +
>> +		if ((!(f->index.added || f->index.deleted)) &&
>> +		   (!strcmp(filter, "index-only")))
>> +				hashmap_remove(file_map, f, NULL);
>> +	}
> As part of the "interactive" machinery, obvious inefficiency in the
> code may not matter that much, but having to make exact string
> comparison for an unmodified parameter twice for each iteration does
> not look like showing a good taste.
>
> What is the earliest time the code can decide that it is asked to do
> a "file-only" filtering?  What I am trying to get at is that if we
> know early enough, instead of grabbing outputs from "diff-files" and
> "diff-index --cached", only to drop such entries that do not have
> output in "diff-files", we could run only "diff-index --cached"
> without spending any cycle to run "diff-files" in the first place.
>
> Even if such a reorganizing of the callflow is impossible (I didn't
> check), at least a micro optimization would be:
>
> 	int i;
> 	int file_only = !strcmp(filter, "file-only");
> 	int index_only = !strcmp(filter, "index-only");
>
> 	for (i = 0; i < hashmap_get_size(file_map), i++) {
> 		struct file_stat *f = files[i];
> 		if (file_only && !(f->worktree.added || f->worktree.deleted))
> 			hashmap_remove(file_map, f, NULL);
> 		...
> 	}
>
>
>
>> +}
>> +
>> +static struct collection_status *list_modified(struct repository *r, const char *filter)
>> +{
>> +	int i = 0;
>> +	struct collection_status *s = xcalloc(1, sizeof(*s));
>> +	struct hashmap_iter iter;
>> +	struct file_stat **files;
>> +	struct file_stat *entry;
>> +
>> +	if (repo_read_index(r) < 0) {
>> +		printf("\n");
>> +		return NULL;
>> +	}
>> +
>> +	s->reference = get_diff_reference();
>> +	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
>> +
>> +	collect_changes_worktree(s);
>> +	collect_changes_index(s);
>> +
>> +	if (hashmap_get_size(&s->file_map) < 1) {
>> +		printf("\n");
>> +		return NULL;
>> +	}
>> +
>> +	hashmap_iter_init(&s->file_map, &iter);
>> +
>> +	files = xcalloc(hashmap_get_size(&s->file_map), sizeof(struct file_stat *));
>> +	while ((entry = hashmap_iter_next(&iter))) {
>> +		files[i++] = entry;
>> +	}
>> +	QSORT(files, hashmap_get_size(&s->file_map), alphabetical_cmp);
>> +
>> +	if (filter)
>> +		filter_files(filter, &s->file_map, files);
> Ahh, this answers my previous question, no?  The "filter" parameter
> given to this function will never change, so we could inspect it
> even before we call collect_chagnes_{worktree,index}().  If the
> caller says "I want to see only the paths that appear in the
> diff-files output", there is no need to call collect_changes_index()
> at all, no?


Yes, this answers your previous question. The "filter" parameter doesn't
change and we can collect specific changes right away instead of collecting
all of them and applying filter after.

Thanks for this one and all the other comments.


>
>> +
>> +	free(files);
>> +	return s;
>> +}

Re: [PATCH v5 03/10] add-interactive.c: implement list_modified

[Slavica Djukic]

On 21-Feb-19 9:27 PM, Junio C Hamano wrote:
> Junio C Hamano <gitster@pobox.com> writes:
>
> A few things I missed in the previous message.
>
>>> +	for (i = 0; i < stat.nr; i++) {
>>> +		struct file_stat *entry;
>>> +		const char *name = stat.files[i]->name;
>>> +		unsigned int hash = strhash(name);
>>> +
>>> +		entry = hashmap_get_from_hash(&s->file_map, hash, name);
>>> +		if (!entry) {
>>> +			FLEX_ALLOC_STR(entry, name, name);
>>> +			hashmap_entry_init(entry, hash);
>>> +			hashmap_add(&s->file_map, entry);
>>> +		}
>> The path may already be in the collection_status.file_map from the
>> previous run when "diff-index --cached" is run, in which case we avoid
>> adding it twice, which makes sense.
>>
>>> +		if (s->phase == WORKTREE) {
>>> +			entry->worktree.added = stat.files[i]->added;
>>> +			entry->worktree.deleted = stat.files[i]->deleted;
>>> +		} else if (s->phase == INDEX) {
>>> +			entry->index.added = stat.files[i]->added;
>>> +			entry->index.deleted = stat.files[i]->deleted;
>>> +		}
>> As the set of phases will not going to grow, not having the final
>> 'else BUG("phase is neither WORKTREE nor INDEX");' here is OK.
>>
>> But stepping back a bit, if we know we will not grow the phases,
>> then it may be simpler *and* equally descriptive to rename .phase
>> field to a boolean ".collecting_from_index" that literally means
>> "are we collecting from the index?" and that way we can also get rid
>> of the enum.
> ... so that this can become
>
> 	if (s->collecting_from_index) {
> 		entry->index.added = stat.files[i]->added;
> 		entry->index.deleted = stat.files[i]->deleted;
> 	} else {
> 		...
> 	}
>
> without "else if" and without having to worry about "what if phase
> is neither?".
>
>> Grep for "unborn" in the codebase.  It probably makes sense to call
>> it on_unborn_branch() instead.
>>
>> 	static int on_unborn_branch(void)
>> 	{
>> 		struct object_id oid;
>> 		return !!get_oid("HEAD", &oid);
>> 	}
>>
>> Eventually, the users of "unborn" in sequencer.c and builtin/reset.c
>> may want to share the implementation but the helper is so small that
>> we probably should not worry about it until the topic is done and
>> leave it for a later clean-up.
> And before such a clean-up happens, the implementation of the helper
> would want to be improved.  "Does 'rev-parse --verify HEAD' work?"
> was an easiest way to see if we are on an unborn branch from a
> script that works most of the time, but as we are rewriting it in C,
> we should use the more direct and correct API to see if "HEAD" is
> a symref, and if it points at a branch that does not yet exist,
> which is available in the refs API as resolve_ref_unsafe().
>
> One issue with lazy use of get_oid("HEAD") is that the function
> dwims and tries to find HEAD in common hierarchies like
> .git/refs/heads/HEAD etc. when .git/HEAD does not work.  We do not
> want such a dwimmery when seeing "are we on an unborn branch?".
>
>>> +static struct collection_status *list_modified(struct repository *r, const char *filter)
>>> +{
>>> +	int i = 0;
>>> +	struct collection_status *s = xcalloc(1, sizeof(*s));
>>> +	struct hashmap_iter iter;
>>> +	struct file_stat **files;
>>> +	struct file_stat *entry;
>>> +
>>> +	if (repo_read_index(r) < 0) {
>>> +		printf("\n");
>>> +		return NULL;
>>> +	}
>>> +
>>> +	s->reference = get_diff_reference();
>>> +	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
>>> +
>>> +	collect_changes_worktree(s);
>>> +	collect_changes_index(s);
>>> +
>>> +	if (hashmap_get_size(&s->file_map) < 1) {
>>> +		printf("\n");
>>> +		return NULL;
>>> +	}
> The non-error codepath of this function does not do any output, but
> we see two "just emit newline" before returning NUULL to signal an
> error to the caller" in the above.  Such a printing from this level
> in the callchain (although we haven't seen callers of this function
> yet at this point in the series) is wrong.  Presumably, the caller,
> when it obtains a non-NULL 's', does something useful and maybe as a
> part of the "useful" thing prints something to the standard output.
> Then the caller is also responsible for handling a NULL return.  I.e.
> upon seeing such a NULL collection status, if the party that invoked
> the caller wants to see a single empty line for whatever reason (which
> in turn is a questionable practice, if you ask me, but at this point
> in the series we haven't seen what that invoker is doing, so for now
> lets assume that it is sane to want to see an empty line), the caller
> should do the putchar('\n').


Caller of list_modified is add_i_status in the later commit, and yes
it should definitely take care of this newline.
It should print it after calling list_modified *and* list_and_choose.

It is done in the same way in the Perl script:
sub status_cmd {
     list_and_choose({ LIST_ONLY => 1, HEADER => $status_head },
             list_modified());
     print "\n";
}

I overlooked this because print_modified (now list_modified) in
the previous iteration was equivalent of status command, and
everything was handled there.
After refactoring, I missed to pick up those printfs.


> Also, these two "return NULL" leaks 's'.


I guess I missed some more things. Thank you.


>

Re: [PATCH v5 04/10] add-interactive.c: implement list_and_choose

[Junio C Hamano]

"Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:

> +#define HEADER_INDENT "      "
> +
>  enum collection_phase {
>  	WORKTREE,
>  	INDEX
> @@ -27,6 +29,61 @@ struct collection_status {
>  	struct hashmap file_map;
>  };
>  
> +struct list_and_choose_options {
> +	int column_n;
> +	unsigned singleton:1;
> +	unsigned list_flat:1;
> +	unsigned list_only:1;
> +	unsigned list_only_file_names:1;
> +	unsigned immediate:1;
> +	char *header;
> +	const char *prompt;

Makes a reader wonder if "header" can also be const (not to be taken
as a suggestion to bend backwards to make it so).

> +	void (*on_eof_fn)(void);
> +};
> +
> +struct choice {
> +	struct hashmap_entry e;
> +	char type;

If this is for choosing among the member of union, possible value(s)
for the type member and which value corresponds to which union
member must be documented somewhere, perhaps as a comment around
here.

> +	union {
> +		void (*command_fn)(void);
> +		struct {
> +			struct {
> +				uintmax_t added, deleted;
> +			} index, worktree;
> +		} file;
> +	} u;
> +	size_t prefix_length;
> +	const char *name;
> +};
> +
> +struct choices {
> +	struct choice **choices;

In general, do not name an array in plural.  An exception is when
the code mostly refers to the array as a whole.

When most accesses are to individual elements, then it would be a
big win to be able to see choice[2] and pronounce it "the second
choice" (you do not say "the second choices").

> +	size_t alloc, nr;
> +};
> +#define CHOICES_INIT { NULL, 0, 0 }
> +
> +static int use_color = -1;
> +enum color_add_i {
> +	COLOR_PROMPT,
> +	COLOR_HEADER,
> +	COLOR_HELP,
> +	COLOR_ERROR
> +};
> +
> +static char colors[][COLOR_MAXLEN] = {

Do not be overly selfish to assume that this will stay to be the
only color pallette in this file.  If this is the color palette for
list_and_choose, then have it in its name, e.g. list_and_choose_color[]
or something like that.

> +	GIT_COLOR_BOLD_BLUE, /* Prompt */
> +	GIT_COLOR_BOLD,      /* Header */
> +	GIT_COLOR_BOLD_RED,  /* Help */
> +	GIT_COLOR_RESET      /* Reset */
> +};

Is the above list of values and comments correct?  

Doesn't each member of enum correspond to each element in
list_and_choose_color[][COLOR_MAXLEN] array?  It does not exactly
match my intuition to have help text in red and error messages in
plain color.

> @@ -186,3 +243,73 @@ static struct collection_status *list_modified(struct repository *r, const char
>  	free(files);
>  	return s;
>  }
> +
> +static struct choices *list_and_choose(struct choices *data,
> +				       struct list_and_choose_options *opts)
> +{
> +	if (!data)
> +		return NULL;
> +
> +	while (1) {
> +		int last_lf = 0;
> +
> +		if (opts->header) {
> +			const char *header_color = get_color(COLOR_HEADER);
> +			if (!opts->list_flat)
> +				printf(HEADER_INDENT);

I won't complain if this is sufficient for the application, but the
above would not allow different level of indentation depending on
what header is being shown.  It may make sense to get rid of list_flat
boolean and instead allow a new "const char *header_indent" member
in the opts structure supplied by the caller.

Don't use printf() when you _know_ you want to show a simple string
without any % interpolation.  fputs(HEADER_INDENT, stdout) would suffice.

> +			color_fprintf_ln(stdout, header_color, "%s", opts->header);
> +		}
> +
> +		for (int i = 0; i < data->nr; i++) {

We do not say "for (int i" (see a previous review).

> +			struct choice *c = data->choices[i];
> +			char *print;
> +			const char *modified_fmt = _("%12s %12s %s");
> +			char worktree_changes[50];
> +			char index_changes[50];
> +			char print_buf[100];

It appears that many of these variables are only needed inside "we
are showing 'f' and not just names" block.  Can their scope be
narrowed?

> +			print = (char *)c->name;

Yuck.  Stuff c->name into print_buf[] instead and get rid of "print"
pointer.

> +			if ((data->choices[i]->type == 'f') && (!opts->list_only_file_names)) {
> +				uintmax_t worktree_added = c->u.file.worktree.added;
> +				uintmax_t worktree_deleted = c->u.file.worktree.deleted;
> +				uintmax_t index_added = c->u.file.index.added;
> +				uintmax_t index_deleted = c->u.file.index.deleted;
> +
> +				if (worktree_added || worktree_deleted)
> +					snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
> +						 worktree_added, worktree_deleted);
> +				else
> +					snprintf(worktree_changes, 50, "%s", _("nothing"));
> +				if (index_added || index_deleted)
> +					snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
> +						 index_added, index_deleted);
> +				else
> +					snprintf(index_changes, 50, "%s", _("unchanged"));
> +
> +				snprintf(print_buf, 100, modified_fmt, index_changes,
> +					 worktree_changes, print);

All of the above look overly repetitious; a helper function that
takes a pointer to "struct { uintmax_t a, d; }" and populates
changes[] buffer would cut them down by half, but other than that
I do not see a room for drastic improvement here X-<.

Oh, it would greatly help to use two strbuf for wt/ix_changes that
are defined outside the loop that is strbuf_reset() after each
iteration and use things like strbuf_addf().

> +				print = xmalloc(strlen(print_buf) + 1);
> +				snprintf(print, 100, "%s", print_buf);

Likewise.

> +			}
> +
> +			printf(" %2d: %s", i + 1, print);
> +			if ((opts->list_flat) && ((i + 1) % (opts->column_n))) {
> +				printf("\t");
> +				last_lf = 0;
> +			}
> +			else {
> +				printf("\n");
> +				last_lf = 1;
> +			}
> +
> +		}
> +
> +		if (!last_lf)
> +			printf("\n");
> +
> +		return NULL;
> +	}
> +}

This obviously only lists but does not let you choose at this step
in the series, but that is OK.

But I see a deeper problem with the design of this helper.  The
things this helper can list is quite limited.

The original was designed so that the shown strings are prepared by
the caller and this helper is solely responsible for showing the
choices, giving prompt, and accepting choice (in various abbreviated
forms), all _WITHOUT_ having to know the meaning of what is in the
list.  It gave us a much better separation of labor and
responsibility between the caller and the callee, I would think.

Re: [PATCH v5 05/10] add-interactive.c: implement status command

[Junio C Hamano]

"Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:

> +static int parse_color_slot(const char *slot)
> +{
> +	if (!strcasecmp(slot, "prompt"))
> +		return COLOR_PROMPT;
> +	if (!strcasecmp(slot, "header"))
> +		return COLOR_HEADER;
> +	if (!strcasecmp(slot, "help"))
> +		return COLOR_HELP;
> +	if (!strcasecmp(slot, "error"))
> +		return COLOR_ERROR;

As these are "color.interactive.<name>", matching case-insensitively
is the right thing to do.  Good.

If we would end up increasing the number of slots, we may need to
switch to LOOKUP_CONFIG(), but for just four of them, this will do.

> @@ -313,3 +357,78 @@ static struct choices *list_and_choose(struct choices *data,
>  		return NULL;
>  	}
>  }
> +
> +static struct choice *make_choice(const char *name )

Excess SP before ')'?

> +{
> +	struct choice *choice;

Style: have a blank line here to delineate decls (at the beginning
of a function) and stmts (at all the decls).

> +	FLEXPTR_ALLOC_STR(choice, name, name);
> +	return choice;
> +}
> +
> +static struct choice *add_choice(struct choices *choices, const char type,
> +				 struct file_stat *file, struct command *command)
> +{
> +	struct choice *choice;

Ditto here.

> +	switch (type) {
> +		case 'f':

Style: in our codebase, switch and case are indented to the same
level, with the body of each case arm indented one more level.

> +			choice = make_choice(file->name);
> +			choice->u.file.index.added = file->index.added;
> +			choice->u.file.index.deleted = file->index.deleted;
> +			choice->u.file.worktree.added = file->worktree.added;
> +			choice->u.file.worktree.deleted = file->worktree.deleted;

Would it make sense to make sure that all of file->index,
u.file.index, file->wt, u.file.wt are exactly the same type of
struct by introducing

	struct adddel { uintmax_t add, del; };

in a very early part of the series, and embed that structure as a
member in "struct choice" and "struct file_stat"?  That way, these
assignments would become two structure assignments, that would be
much easier to read.

> +void add_i_status(void)
> +{
> +	struct collection_status *s;
> +	struct list_and_choose_options opts = { 0 };
> +	struct hashmap *map;
> +	struct hashmap_iter iter;
> +	struct choices choices = CHOICES_INIT;
> +	struct file_stat *entry;
> +	const char *modified_fmt = _("%12s %12s %s");
> +	const char type = 'f';
> +
> +	opts.header = xmalloc(sizeof(char) * (HEADER_MAXLEN + 1));
> +	snprintf(opts.header, HEADER_MAXLEN + 1, modified_fmt,
> +		 _("staged"), _("unstaged"), _("path"));

Is there aversion to use of strbuf among your mentors?


> +	s = list_modified(the_repository, NULL);
> +	if (s == NULL)
> +		return;
> +
> +	map = &s->file_map;
> +	hashmap_iter_init(map, &iter);
> +	while ((entry = hashmap_iter_next(&iter))) {
> +		add_choice(&choices, type, entry, NULL);
> +	}
> +
> +	list_and_choose(&choices, &opts);

In what order are these filenames given?  Whatever random order the
hashmap happens to store them in?

I vaguely recall in an earlier step the code used hashmap to collect
but at the end produced a sorted list out of the final result.
Shouldn't we be iterating over that sorted list instead?  Do we even
need the hashmap at this point?

> +	hashmap_free(&s->file_map, 1);
> +	free(s);
> +	free_choices(&choices);

Did we just leak opt.header?

> +}
> diff --git a/add-interactive.h b/add-interactive.h
> new file mode 100644
> index 0000000000..8ef3d2e82b
> --- /dev/null
> +++ b/add-interactive.h
> @@ -0,0 +1,8 @@
> +#ifndef ADD_INTERACTIVE_H
> +#define ADD_INTERACTIVE_H
> +
> +int add_i_config(const char *var, const char *value, void *cbdata);
> +
> +void add_i_status(void);
> +
> +#endif
> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
> index 6a97f0e191..464d2245f3 100644
> --- a/builtin/add--helper.c
> +++ b/builtin/add--helper.c
> @@ -1,6 +1,38 @@
> +#include "add-interactive.h"
>  #include "builtin.h"
> +#include "config.h"
> +#include "revision.h"
> +
> +static const char * const builtin_add_helper_usage[] = {
> +	N_("git add-interactive--helper <command>"),
> +	NULL
> +};
> +
> +enum cmd_mode {
> +	DEFAULT = 0,
> +	STATUS
> +};
>  
>  int cmd_add__helper(int argc, const char **argv, const char *prefix)
>  {
> +	enum cmd_mode mode = DEFAULT;
> +
> +	struct option options[] = {
> +		OPT_CMDMODE(0, "status", &mode,
> +			    N_("print status information with diffstat"), STATUS),
> +		OPT_END()
> +	};
> +
> +	git_config(add_i_config, NULL);
> +	argc = parse_options(argc, argv, NULL, options,
> +			     builtin_add_helper_usage,
> +			     PARSE_OPT_KEEP_ARGV0);
> +
> +	if (mode == STATUS)
> +		add_i_status();
> +	else
> +		usage_with_options(builtin_add_helper_usage,
> +				   options);
> +
>  	return 0;
>  }

Re: [PATCH v5 05/10] add-interactive.c: implement status command

[Slavica Djukic]

On 22-Feb-19 11:11 PM, Junio C Hamano wrote:
> "Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> +static int parse_color_slot(const char *slot)
>> +{
>> +	if (!strcasecmp(slot, "prompt"))
>> +		return COLOR_PROMPT;
>> +	if (!strcasecmp(slot, "header"))
>> +		return COLOR_HEADER;
>> +	if (!strcasecmp(slot, "help"))
>> +		return COLOR_HELP;
>> +	if (!strcasecmp(slot, "error"))
>> +		return COLOR_ERROR;
> As these are "color.interactive.<name>", matching case-insensitively
> is the right thing to do.  Good.
>
> If we would end up increasing the number of slots, we may need to
> switch to LOOKUP_CONFIG(), but for just four of them, this will do.
>
>> @@ -313,3 +357,78 @@ static struct choices *list_and_choose(struct choices *data,
>>   		return NULL;
>>   	}
>>   }
>> +
>> +static struct choice *make_choice(const char *name )
> Excess SP before ')'?
>
>> +{
>> +	struct choice *choice;
> Style: have a blank line here to delineate decls (at the beginning
> of a function) and stmts (at all the decls).
>
>> +	FLEXPTR_ALLOC_STR(choice, name, name);
>> +	return choice;
>> +}
>> +
>> +static struct choice *add_choice(struct choices *choices, const char type,
>> +				 struct file_stat *file, struct command *command)
>> +{
>> +	struct choice *choice;
> Ditto here.
>
>> +	switch (type) {
>> +		case 'f':
> Style: in our codebase, switch and case are indented to the same
> level, with the body of each case arm indented one more level.
>
>> +			choice = make_choice(file->name);
>> +			choice->u.file.index.added = file->index.added;
>> +			choice->u.file.index.deleted = file->index.deleted;
>> +			choice->u.file.worktree.added = file->worktree.added;
>> +			choice->u.file.worktree.deleted = file->worktree.deleted;
> Would it make sense to make sure that all of file->index,
> u.file.index, file->wt, u.file.wt are exactly the same type of
> struct by introducing
>
> 	struct adddel { uintmax_t add, del; };
>
> in a very early part of the series, and embed that structure as a
> member in "struct choice" and "struct file_stat"?  That way, these
> assignments would become two structure assignments, that would be
> much easier to read.


Yes, definitely. I worked on this and it will be included in the next 
iteration.


>
>> +void add_i_status(void)
>> +{
>> +	struct collection_status *s;
>> +	struct list_and_choose_options opts = { 0 };
>> +	struct hashmap *map;
>> +	struct hashmap_iter iter;
>> +	struct choices choices = CHOICES_INIT;
>> +	struct file_stat *entry;
>> +	const char *modified_fmt = _("%12s %12s %s");
>> +	const char type = 'f';
>> +
>> +	opts.header = xmalloc(sizeof(char) * (HEADER_MAXLEN + 1));
>> +	snprintf(opts.header, HEADER_MAXLEN + 1, modified_fmt,
>> +		 _("staged"), _("unstaged"), _("path"));
> Is there aversion to use of strbuf among your mentors?
>
>
>> +	s = list_modified(the_repository, NULL);
>> +	if (s == NULL)
>> +		return;
>> +
>> +	map = &s->file_map;
>> +	hashmap_iter_init(map, &iter);
>> +	while ((entry = hashmap_iter_next(&iter))) {
>> +		add_choice(&choices, type, entry, NULL);
>> +	}
>> +
>> +	list_and_choose(&choices, &opts);
> In what order are these filenames given?  Whatever random order the
> hashmap happens to store them in?
>
> I vaguely recall in an earlier step the code used hashmap to collect
> but at the end produced a sorted list out of the final result.
> Shouldn't we be iterating over that sorted list instead?  Do we even
> need the hashmap at this point?


We actually don't need hashmap at this point, I've changed this so that
list_modified returns produced sorted list.
I've also applied all other suggestions in this message.
Thank you.

>> +	hashmap_free(&s->file_map, 1);
>> +	free(s);
>> +	free_choices(&choices);
> Did we just leak opt.header?
>
>> +}
>> diff --git a/add-interactive.h b/add-interactive.h
>> new file mode 100644
>> index 0000000000..8ef3d2e82b
>> --- /dev/null
>> +++ b/add-interactive.h
>> @@ -0,0 +1,8 @@
>> +#ifndef ADD_INTERACTIVE_H
>> +#define ADD_INTERACTIVE_H
>> +
>> +int add_i_config(const char *var, const char *value, void *cbdata);
>> +
>> +void add_i_status(void);
>> +
>> +#endif
>> diff --git a/builtin/add--helper.c b/builtin/add--helper.c
>> index 6a97f0e191..464d2245f3 100644
>> --- a/builtin/add--helper.c
>> +++ b/builtin/add--helper.c
>> @@ -1,6 +1,38 @@
>> +#include "add-interactive.h"
>>   #include "builtin.h"
>> +#include "config.h"
>> +#include "revision.h"
>> +
>> +static const char * const builtin_add_helper_usage[] = {
>> +	N_("git add-interactive--helper <command>"),
>> +	NULL
>> +};
>> +
>> +enum cmd_mode {
>> +	DEFAULT = 0,
>> +	STATUS
>> +};
>>   
>>   int cmd_add__helper(int argc, const char **argv, const char *prefix)
>>   {
>> +	enum cmd_mode mode = DEFAULT;
>> +
>> +	struct option options[] = {
>> +		OPT_CMDMODE(0, "status", &mode,
>> +			    N_("print status information with diffstat"), STATUS),
>> +		OPT_END()
>> +	};
>> +
>> +	git_config(add_i_config, NULL);
>> +	argc = parse_options(argc, argv, NULL, options,
>> +			     builtin_add_helper_usage,
>> +			     PARSE_OPT_KEEP_ARGV0);
>> +
>> +	if (mode == STATUS)
>> +		add_i_status();
>> +	else
>> +		usage_with_options(builtin_add_helper_usage,
>> +				   options);
>> +
>>   	return 0;
>>   }

Re: [PATCH v5 04/10] add-interactive.c: implement list_and_choose

[Slavica Djukic]

On 22-Feb-19 10:46 PM, Junio C Hamano wrote:
> "Slavica Djukic via GitGitGadget" <gitgitgadget@gmail.com> writes:
>
>> +#define HEADER_INDENT "      "
>> +
>>   enum collection_phase {
>>   	WORKTREE,
>>   	INDEX
>> @@ -27,6 +29,61 @@ struct collection_status {
>>   	struct hashmap file_map;
>>   };
>>   
>> +struct list_and_choose_options {
>> +	int column_n;
>> +	unsigned singleton:1;
>> +	unsigned list_flat:1;
>> +	unsigned list_only:1;
>> +	unsigned list_only_file_names:1;
>> +	unsigned immediate:1;
>> +	char *header;
>> +	const char *prompt;
> Makes a reader wonder if "header" can also be const (not to be taken
> as a suggestion to bend backwards to make it so).
>
>> +	void (*on_eof_fn)(void);
>> +};
>> +
>> +struct choice {
>> +	struct hashmap_entry e;
>> +	char type;
> If this is for choosing among the member of union, possible value(s)
> for the type member and which value corresponds to which union
> member must be documented somewhere, perhaps as a comment around
> here.
>
>> +	union {
>> +		void (*command_fn)(void);
>> +		struct {
>> +			struct {
>> +				uintmax_t added, deleted;
>> +			} index, worktree;
>> +		} file;
>> +	} u;
>> +	size_t prefix_length;
>> +	const char *name;
>> +};
>> +
>> +struct choices {
>> +	struct choice **choices;
> In general, do not name an array in plural.  An exception is when
> the code mostly refers to the array as a whole.
>
> When most accesses are to individual elements, then it would be a
> big win to be able to see choice[2] and pronounce it "the second
> choice" (you do not say "the second choices").
>
>> +	size_t alloc, nr;
>> +};
>> +#define CHOICES_INIT { NULL, 0, 0 }
>> +
>> +static int use_color = -1;
>> +enum color_add_i {
>> +	COLOR_PROMPT,
>> +	COLOR_HEADER,
>> +	COLOR_HELP,
>> +	COLOR_ERROR
>> +};
>> +
>> +static char colors[][COLOR_MAXLEN] = {
> Do not be overly selfish to assume that this will stay to be the
> only color pallette in this file.  If this is the color palette for
> list_and_choose, then have it in its name, e.g. list_and_choose_color[]
> or something like that.
>
>> +	GIT_COLOR_BOLD_BLUE, /* Prompt */
>> +	GIT_COLOR_BOLD,      /* Header */
>> +	GIT_COLOR_BOLD_RED,  /* Help */
>> +	GIT_COLOR_RESET      /* Reset */
>> +};
> Is the above list of values and comments correct?
>
> Doesn't each member of enum correspond to each element in
> list_and_choose_color[][COLOR_MAXLEN] array?  It does not exactly
> match my intuition to have help text in red and error messages in
> plain color.


I noticed I didn't add colors in corresponding commits, but list is 
correct -- later
on in patch series there is

GIT_COLOR_BOLD_RED, /* Error*/

added so that error messages are shown in red.


Help text is also in red following up what is happening in 
git-add--interactive.perl.

>> @@ -186,3 +243,73 @@ static struct collection_status *list_modified(struct repository *r, const char
>>   	free(files);
>>   	return s;
>>   }
>> +
>> +static struct choices *list_and_choose(struct choices *data,
>> +				       struct list_and_choose_options *opts)
>> +{
>> +	if (!data)
>> +		return NULL;
>> +
>> +	while (1) {
>> +		int last_lf = 0;
>> +
>> +		if (opts->header) {
>> +			const char *header_color = get_color(COLOR_HEADER);
>> +			if (!opts->list_flat)
>> +				printf(HEADER_INDENT);
> I won't complain if this is sufficient for the application, but the
> above would not allow different level of indentation depending on
> what header is being shown.  It may make sense to get rid of list_flat
> boolean and instead allow a new "const char *header_indent" member
> in the opts structure supplied by the caller.
>
> Don't use printf() when you _know_ you want to show a simple string
> without any % interpolation.  fputs(HEADER_INDENT, stdout) would suffice.
>
>> +			color_fprintf_ln(stdout, header_color, "%s", opts->header);
>> +		}
>> +
>> +		for (int i = 0; i < data->nr; i++) {
> We do not say "for (int i" (see a previous review).
>
>> +			struct choice *c = data->choices[i];
>> +			char *print;
>> +			const char *modified_fmt = _("%12s %12s %s");
>> +			char worktree_changes[50];
>> +			char index_changes[50];
>> +			char print_buf[100];
> It appears that many of these variables are only needed inside "we
> are showing 'f' and not just names" block.  Can their scope be
> narrowed?


Yes, I will change this.


>
>> +			print = (char *)c->name;
> Yuck.  Stuff c->name into print_buf[] instead and get rid of "print"
> pointer.
>
>> +			if ((data->choices[i]->type == 'f') && (!opts->list_only_file_names)) {
>> +				uintmax_t worktree_added = c->u.file.worktree.added;
>> +				uintmax_t worktree_deleted = c->u.file.worktree.deleted;
>> +				uintmax_t index_added = c->u.file.index.added;
>> +				uintmax_t index_deleted = c->u.file.index.deleted;
>> +
>> +				if (worktree_added || worktree_deleted)
>> +					snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
>> +						 worktree_added, worktree_deleted);
>> +				else
>> +					snprintf(worktree_changes, 50, "%s", _("nothing"));
>> +				if (index_added || index_deleted)
>> +					snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX,
>> +						 index_added, index_deleted);
>> +				else
>> +					snprintf(index_changes, 50, "%s", _("unchanged"));
>> +
>> +				snprintf(print_buf, 100, modified_fmt, index_changes,
>> +					 worktree_changes, print);
> All of the above look overly repetitious; a helper function that
> takes a pointer to "struct { uintmax_t a, d; }" and populates
> changes[] buffer would cut them down by half, but other than that
> I do not see a room for drastic improvement here X-<.
>
> Oh, it would greatly help to use two strbuf for wt/ix_changes that
> are defined outside the loop that is strbuf_reset() after each
> iteration and use things like strbuf_addf().
>
>> +				print = xmalloc(strlen(print_buf) + 1);
>> +				snprintf(print, 100, "%s", print_buf);
> Likewise.
>
>> +			}
>> +
>> +			printf(" %2d: %s", i + 1, print);
>> +			if ((opts->list_flat) && ((i + 1) % (opts->column_n))) {
>> +				printf("\t");
>> +				last_lf = 0;
>> +			}
>> +			else {
>> +				printf("\n");
>> +				last_lf = 1;
>> +			}
>> +
>> +		}
>> +
>> +		if (!last_lf)
>> +			printf("\n");
>> +
>> +		return NULL;
>> +	}
>> +}
> This obviously only lists but does not let you choose at this step
> in the series, but that is OK.
>
> But I see a deeper problem with the design of this helper.  The
> things this helper can list is quite limited.
>
> The original was designed so that the shown strings are prepared by
> the caller and this helper is solely responsible for showing the
> choices, giving prompt, and accepting choice (in various abbreviated
> forms), all _WITHOUT_ having to know the meaning of what is in the
> list.  It gave us a much better separation of labor and
> responsibility between the caller and the callee, I would think.
>

Thanks for pointing this out. I talked to my mentor and I'm now working on
making list_and_choose more "type-independent".

I didn't reply to all suggestions in this message, but I did apply them 
in the code.

>

End of Outreachy internship

[Slavica Djukic]

Hi everyone,

Today is officially the last day of my Outreachy internship.
I wanted to say a few things about my experience and future of the
project I worked on.
Project was "Turn git add -i into built-in" with Johannes Schindelin
as my mentor.

I truly had amazing time, I learned so much about
coding and Git itself, went to Git Merge and FOSDEM and had a chance
to meet great people.
I've never contributed before to open-source, and now that I did,
I find it invaluable experience.
Although my obligations at this point don't allow me to work on
the project, I will try my best to contribute in the future to Git
or/and other great open-source projects.
That said, my mentor Johannes Schindelin will continue to work on
the project from now on.

What is implemented in this project so far:
commands: status and help, helper functions like highlight_prefix(),
find_unique_prefixes(), is_valid_prefix(), etc., but most importantly:
list_and_choose() and list_modified().
Most of the add -i commands will use those two functions to collect,
show the data and let the user make a choice.

What is left to be done:
In the current patch series, I got a lot of suggestion from Junio,
and I applied all of them -- the only thing left is correcting
list_and_choose more to make it type-independent.
In the future, all the other commands: update, revert, add untracked,
patch, diff and quit.

I would like to thank all reviewers for useful suggestions and
comprehension.
And thousand thanks to Johannes Schindelin, who turned out to be
the most amazing mentor.

-Slavica Djukic

On 20-Feb-19 12:41 PM, Slavica Đukić via GitGitGadget wrote:
> This is the first version of a patch series to start porting
> git-add--interactive from Perl to C. Daniel Ferreira's patch series used as
> a head start:
> https://public-inbox.org/git/1494907234-28903-1-git-send-email-bnmvco@gmail.com/t/#u
>
> Changes since v4:
>
>   * rename print_modified to list_modifed
>   * the big change was implementing list_and_choose, which resulted in code
>     refactoring, i.e. separating list_modified and status_cmd and making
>     status_cmd use both list_modified and list_and_choose
>   * implement struct choice instead of struct stuff_item as main data
>     structure for list_and_choose
>   * introduce list_only option and implement support for !list_only users
>   * introduce highlighting of unique prefixes
>
> Note that authorship handling is slightly changed. In some of the commits, I
> used Original-patch-by instead of listing Daniel Ferreira as author.
>
> Also, I would like to point out that my Outreachy internship is going to
> finish on March 4 and I would really appreciate reviews before it does.
>
> Daniel Ferreira (3):
>    diff: export diffstat interface
>    add--helper: create builtin helper for interactive add
>    add--interactive.perl: use add--helper --status for status_cmd
>
> Slavica Djukic (7):
>    add-interactive.c: implement list_modified
>    add-interactive.c: implement list_and_choose
>    add-interactive.c: implement status command
>    add-interactive.c: add support for list_only option
>    add-interactive.c: implement show-help command
>    t3701-add-interactive: test add_i_show_help()
>    add--interactive.perl: use add--helper --show-help for help_cmd
>
>   .gitignore                 |   1 +
>   Makefile                   |   2 +
>   add-interactive.c          | 819 +++++++++++++++++++++++++++++++++++++
>   add-interactive.h          |  10 +
>   builtin.h                  |   1 +
>   builtin/add--helper.c      |  43 ++
>   diff.c                     |  36 +-
>   diff.h                     |  18 +
>   git-add--interactive.perl  |  17 +-
>   git.c                      |   1 +
>   t/t3701-add-interactive.sh |  24 ++
>   11 files changed, 937 insertions(+), 35 deletions(-)
>   create mode 100644 add-interactive.c
>   create mode 100644 add-interactive.h
>   create mode 100644 builtin/add--helper.c
>
>
> base-commit: ca1b4116483b397e78483376296bcd23916ab553
> Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-103%2FslavicaDj%2Fadd-i-v5
> Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-103/slavicaDj/add-i-v5
> Pull-Request: https://github.com/gitgitgadget/git/pull/103
>
> Range-diff vs v4:
>
>    1:  737767b6f4 !  1:  d839f0c082 diff: export diffstat interface
>       @@ -11,6 +11,7 @@
>            how the show_* functions used by diff_flush() do it. One example is the
>            builtin implementation of git-add--interactive's status.
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>        
>    2:  91b1963125 !  2:  304c3863b1 add--helper: create builtin helper for interactive add
>       @@ -2,8 +2,8 @@
>        
>            add--helper: create builtin helper for interactive add
>        
>       -    Create a builtin helper for git-add--interactive, which right now is not
>       -    able to do anything.
>       +    Create a builtin helper for git-add--interactive, which at this point
>       +    is not doing anything.
>        
>            This is the first step in an effort to convert git-add--interactive.perl
>            to a C builtin, in search for better portability, expressibility and
>       @@ -13,6 +13,7 @@
>            remove the last "big" Git script to have Perl as a dependency, allowing
>            most Git users to have a NOPERL build running without big losses.
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>        
>    3:  d247ef69fe !  3:  8790ffaa39 add-interactive.c: implement status command
>       @@ -1,17 +1,12 @@
>       -Author: Daniel Ferreira <bnmvco@gmail.com>
>       +Author: Slavica Djukic <slawica92@hotmail.com>
>        
>       -    add-interactive.c: implement status command
>       +    add-interactive.c: implement list_modified
>        
>       -    Add new files: add-interactive.c and add-interactive.h, which
>       -    will be used for implementing "application logic" of git add -i,
>       -    whereas add--helper.c will be used mostly for parsing the command line.
>       -    We're a bit lax with the command-line parsing, as the command is
>       -    intended to be called only by one internal user: the add--interactive script.
>       +    Implement list_modified from Perl, which will be used
>       +    by most of the *_cmd functions, including status in the
>       +    following commit.
>        
>       -    Implement add --interactive's status command in add-interactive.c and
>       -    use it in builtin add--helper.c.
>       -
>       -    It prints a numstat comparing changed files between a) the worktree and
>       +    It lists a numstat comparing changed files between a) the worktree and
>            the index; b) the index and the HEAD.
>        
>            To do so, we use run_diff_index() and run_diff_files() to get changed
>       @@ -19,11 +14,13 @@
>            combination of a hashmap and qsort() to print the result in
>            O(n) + O(n lg n) complexity.
>        
>       -    This is the first interactive add command implemented in C of those
>       -    anticipated by the previous commit, which introduced
>       -    the add--helper built-in.
>       +    Add new file: add-interactive.c which will be used for implementing
>       +    "application logic" of git add -i (alongside with add-interactive.h,
>       +    added in later commit), whereas add--helper.c will be used mostly
>       +    for parsing the command line.
>        
>       -    Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>       +    Original-patch-by: Daniel Ferreira <bnmvco@gmail.com>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>        
>         diff --git a/Makefile b/Makefile
>       @@ -43,7 +40,6 @@
>         --- /dev/null
>         +++ b/add-interactive.c
>        @@
>       -+#include "add-interactive.h"
>        +#include "cache.h"
>        +#include "commit.h"
>        +#include "color.h"
>       @@ -51,8 +47,6 @@
>        +#include "diffcore.h"
>        +#include "revision.h"
>        +
>       -+#define HEADER_INDENT "      "
>       -+
>        +enum collection_phase {
>        +	WORKTREE,
>        +	INDEX
>       @@ -75,66 +69,8 @@
>        +	struct hashmap file_map;
>        +};
>        +
>       -+static int use_color = -1;
>       -+enum color_add_i {
>       -+	COLOR_PROMPT,
>       -+	COLOR_HEADER,
>       -+	COLOR_HELP,
>       -+	COLOR_ERROR
>       -+};
>       -+
>       -+static char colors[][COLOR_MAXLEN] = {
>       -+	GIT_COLOR_BOLD_BLUE, /* Prompt */
>       -+	GIT_COLOR_BOLD,      /* Header */
>       -+	GIT_COLOR_BOLD_RED,  /* Help */
>       -+	GIT_COLOR_BOLD_RED   /* Error */
>       -+};
>       -+
>       -+static const char *get_color(enum color_add_i ix)
>       -+{
>       -+	if (want_color(use_color))
>       -+		return colors[ix];
>       -+	return "";
>       -+}
>       -+
>       -+static int parse_color_slot(const char *slot)
>       -+{
>       -+	if (!strcasecmp(slot, "prompt"))
>       -+		return COLOR_PROMPT;
>       -+	if (!strcasecmp(slot, "header"))
>       -+		return COLOR_HEADER;
>       -+	if (!strcasecmp(slot, "help"))
>       -+		return COLOR_HELP;
>       -+	if (!strcasecmp(slot, "error"))
>       -+		return COLOR_ERROR;
>       -+
>       -+	return -1;
>       -+}
>       -+
>       -+int add_i_config(const char *var,
>       -+		const char *value, void *cbdata)
>       -+{
>       -+	const char *name;
>       -+
>       -+	if (!strcmp(var, "color.interactive")) {
>       -+		use_color = git_config_colorbool(var, value);
>       -+		return 0;
>       -+	}
>       -+
>       -+	if (skip_prefix(var, "color.interactive.", &name)) {
>       -+		int slot = parse_color_slot(name);
>       -+		if (slot < 0)
>       -+			return 0;
>       -+		if (!value)
>       -+			return config_error_nonbool(var);
>       -+		return color_parse(value, colors[slot]);
>       -+	}
>       -+
>       -+	return git_default_config(var, value, cbdata);
>       -+}
>       -+
>        +static int hash_cmp(const void *unused_cmp_data, const void *entry,
>       -+			const void *entry_or_key, const void *keydata)
>       ++		    const void *entry_or_key, const void *keydata)
>        +{
>        +	const struct file_stat *e1 = entry, *e2 = entry_or_key;
>        +	const char *name = keydata ? keydata : e2->name;
>       @@ -151,8 +87,8 @@
>        +}
>        +
>        +static void collect_changes_cb(struct diff_queue_struct *q,
>       -+					 struct diff_options *options,
>       -+					 void *data)
>       ++			       struct diff_options *options,
>       ++			       void *data)
>        +{
>        +	struct collection_status *s = data;
>        +	struct diffstat_t stat = { 0 };
>       @@ -222,128 +158,73 @@
>        +	run_diff_index(&rev, 1);
>        +}
>        +
>       -+void add_i_print_modified(void)
>       ++static int is_inital_commit(void)
>        +{
>       -+	int i = 0;
>       -+	struct collection_status s;
>       -+	/* TRANSLATORS: you can adjust this to align "git add -i" status menu */
>       -+	const char *modified_fmt = _("%12s %12s %s");
>       -+	const char *header_color = get_color(COLOR_HEADER);
>        +	struct object_id sha1;
>       ++	if (get_oid("HEAD", &sha1))
>       ++		return 1;
>       ++	return 0;
>       ++}
>       ++
>       ++static const char *get_diff_reference(void)
>       ++{
>       ++	if(is_inital_commit())
>       ++		return empty_tree_oid_hex();
>       ++	return "HEAD";
>       ++}
>       ++
>       ++static void filter_files(const char *filter, struct hashmap *file_map,
>       ++			 struct file_stat **files)
>       ++{
>       ++
>       ++	for (int i = 0; i < hashmap_get_size(file_map); i++) {
>       ++		struct file_stat *f = files[i];
>       ++
>       ++		if ((!(f->worktree.added || f->worktree.deleted)) &&
>       ++		   (!strcmp(filter, "file-only")))
>       ++				hashmap_remove(file_map, f, NULL);
>        +
>       ++		if ((!(f->index.added || f->index.deleted)) &&
>       ++		   (!strcmp(filter, "index-only")))
>       ++				hashmap_remove(file_map, f, NULL);
>       ++	}
>       ++}
>       ++
>       ++static struct collection_status *list_modified(struct repository *r, const char *filter)
>       ++{
>       ++	int i = 0;
>       ++	struct collection_status *s = xcalloc(1, sizeof(*s));
>        +	struct hashmap_iter iter;
>        +	struct file_stat **files;
>        +	struct file_stat *entry;
>        +
>       -+	if (read_cache() < 0)
>       -+		return;
>       ++	if (repo_read_index(r) < 0) {
>       ++		printf("\n");
>       ++		return NULL;
>       ++	}
>        +
>       -+	s.reference = !get_oid("HEAD", &sha1) ? "HEAD": empty_tree_oid_hex();
>       -+	hashmap_init(&s.file_map, hash_cmp, NULL, 0);
>       ++	s->reference = get_diff_reference();
>       ++	hashmap_init(&s->file_map, hash_cmp, NULL, 0);
>        +
>       -+	collect_changes_worktree(&s);
>       -+	collect_changes_index(&s);
>       ++	collect_changes_worktree(s);
>       ++	collect_changes_index(s);
>        +
>       -+	if (hashmap_get_size(&s.file_map) < 1) {
>       ++	if (hashmap_get_size(&s->file_map) < 1) {
>        +		printf("\n");
>       -+		return;
>       ++		return NULL;
>        +	}
>        +
>       -+	printf(HEADER_INDENT);
>       -+	color_fprintf(stdout, header_color, modified_fmt, _("staged"),
>       -+			_("unstaged"), _("path"));
>       -+	printf("\n");
>       -+
>       -+	hashmap_iter_init(&s.file_map, &iter);
>       ++	hashmap_iter_init(&s->file_map, &iter);
>        +
>       -+	files = xcalloc(hashmap_get_size(&s.file_map), sizeof(struct file_stat *));
>       ++	files = xcalloc(hashmap_get_size(&s->file_map), sizeof(struct file_stat *));
>        +	while ((entry = hashmap_iter_next(&iter))) {
>        +		files[i++] = entry;
>        +	}
>       -+	QSORT(files, hashmap_get_size(&s.file_map), alphabetical_cmp);
>       ++	QSORT(files, hashmap_get_size(&s->file_map), alphabetical_cmp);
>        +
>       -+	for (i = 0; i < hashmap_get_size(&s.file_map); i++) {
>       -+		struct file_stat *f = files[i];
>       -+
>       -+		char worktree_changes[50];
>       -+		char index_changes[50];
>       -+
>       -+		if (f->worktree.added || f->worktree.deleted)
>       -+			snprintf(worktree_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->worktree.added,
>       -+					f->worktree.deleted);
>       -+		else
>       -+			snprintf(worktree_changes, 50, "%s", _("nothing"));
>       -+
>       -+		if (f->index.added || f->index.deleted)
>       -+			snprintf(index_changes, 50, "+%"PRIuMAX"/-%"PRIuMAX, f->index.added,
>       -+					f->index.deleted);
>       -+		else
>       -+			snprintf(index_changes, 50, "%s", _("unchanged"));
>       -+
>       -+		printf(" %2d: ", i + 1);
>       -+		printf(modified_fmt, index_changes, worktree_changes, f->name);
>       -+		printf("\n");
>       -+	}
>       -+	printf("\n");
>       ++	if (filter)
>       ++		filter_files(filter, &s->file_map, files);
>        +
>        +	free(files);
>       -+	hashmap_free(&s.file_map, 1);
>       ++	return s;
>        +}
>       -
>       - diff --git a/add-interactive.h b/add-interactive.h
>       - new file mode 100644
>       - --- /dev/null
>       - +++ b/add-interactive.h
>       -@@
>       -+#ifndef ADD_INTERACTIVE_H
>       -+#define ADD_INTERACTIVE_H
>       -+
>       -+int add_i_config(const char *var, const char *value, void *cbdata);
>       -+
>       -+void add_i_print_modified(void);
>       -+
>       -+#endif
>       - \ No newline at end of file
>       -
>       - diff --git a/builtin/add--helper.c b/builtin/add--helper.c
>       - --- a/builtin/add--helper.c
>       - +++ b/builtin/add--helper.c
>       -@@
>       -+#include "add-interactive.h"
>       - #include "builtin.h"
>       -+#include "config.h"
>       -+#include "revision.h"
>       -+
>       -+static const char * const builtin_add_helper_usage[] = {
>       -+	N_("git add-interactive--helper <command>"),
>       -+	NULL
>       -+};
>       -+
>       -+enum cmd_mode {
>       -+	DEFAULT = 0,
>       -+	STATUS
>       -+};
>       -
>       - int cmd_add__helper(int argc, const char **argv, const char *prefix)
>       - {
>       -+	enum cmd_mode mode = DEFAULT;
>       -+
>       -+	struct option options[] = {
>       -+		OPT_CMDMODE(0, "status", &mode,
>       -+			 N_("print status information with diffstat"), STATUS),
>       -+		OPT_END()
>       -+	};
>       -+
>       -+	git_config(add_i_config, NULL);
>       -+	argc = parse_options(argc, argv, NULL, options,
>       -+			     builtin_add_helper_usage,
>       -+			     PARSE_OPT_KEEP_ARGV0);
>       -+
>       -+	if (mode == STATUS)
>       -+		add_i_print_modified();
>       -+	else
>       -+		usage_with_options(builtin_add_helper_usage,
>       -+				   options);
>       -+
>       - 	return 0;
>       - }
>    -:  ---------- >  4:  a97b29d274 add-interactive.c: implement list_and_choose
>    -:  ---------- >  5:  9a72aabe6c add-interactive.c: implement status command
>    4:  fb3f9378ac !  6:  883963ee6e add--interactive.perl: use add--helper --status for status_cmd
>       @@ -14,6 +14,7 @@
>            the fact that it would be hard to test, we'll pass on adding
>            a regression test for this.
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Daniel Ferreira <bnmvco@gmail.com>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>            Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>    -:  ---------- >  7:  7912f37517 add-interactive.c: add support for list_only option
>    5:  ab16afd1d5 !  8:  441321fc3d add-interactive.c: implement show-help command
>       @@ -10,31 +10,32 @@
>            handle_builtin and re-routed to the help command, without ever
>            calling cmd_add__helper().
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>        
>         diff --git a/add-interactive.c b/add-interactive.c
>         --- a/add-interactive.c
>         +++ b/add-interactive.c
>        @@
>       - 	free(files);
>       - 	hashmap_free(&s.file_map, 1);
>       + 	free(s);
>       + 	free_choices(&choices);
>         }
>        +
>        +void add_i_show_help(void)
>        +{
>        +	const char *help_color = get_color(COLOR_HELP);
>        +	color_fprintf_ln(stdout, help_color, "status        - %s",
>       -+			_("show paths with changes"));
>       ++			 _("show paths with changes"));
>        +	color_fprintf_ln(stdout, help_color, "update        - %s",
>       -+			_("add working tree state to the staged set of changes"));
>       ++			 _("add working tree state to the staged set of changes"));
>        +	color_fprintf_ln(stdout, help_color, "revert        - %s",
>       -+			_("revert staged set of changes back to the HEAD version"));
>       ++			 _("revert staged set of changes back to the HEAD version"));
>        +	color_fprintf_ln(stdout, help_color, "patch         - %s",
>       -+			_("pick hunks and update selectively"));
>       ++			 _("pick hunks and update selectively"));
>        +	color_fprintf_ln(stdout, help_color, "diff          - %s",
>       -+			_("view diff between HEAD and index"));
>       ++			 _("view diff between HEAD and index"));
>        +	color_fprintf_ln(stdout, help_color, "add untracked - %s",
>       -+			_("add contents of untracked files to the staged set of changes"));
>       ++			 _("add contents of untracked files to the staged set of changes"));
>        +}
>        
>         diff --git a/add-interactive.h b/add-interactive.h
>       @@ -42,13 +43,11 @@
>         +++ b/add-interactive.h
>        @@
>         
>       - void add_i_print_modified(void);
>       + void add_i_status(void);
>         
>       --#endif
>       - \ No newline at end of file
>        +void add_i_show_help(void);
>        +
>       -+#endif
>       + #endif
>        
>         diff --git a/builtin/add--helper.c b/builtin/add--helper.c
>         --- a/builtin/add--helper.c
>       @@ -66,16 +65,16 @@
>        @@
>         	struct option options[] = {
>         		OPT_CMDMODE(0, "status", &mode,
>       - 			 N_("print status information with diffstat"), STATUS),
>       + 			    N_("print status information with diffstat"), STATUS),
>        +		OPT_CMDMODE(0, "show-help", &mode,
>       -+			 N_("show help"), HELP),
>       ++			    N_("show help"), HELP),
>         		OPT_END()
>         	};
>         
>        @@
>         
>         	if (mode == STATUS)
>       - 		add_i_print_modified();
>       + 		add_i_status();
>        +	else if (mode == HELP)
>        +		add_i_show_help();
>         	else
>    6:  0a27304a84 !  9:  315ae8b211 t3701-add-interactive: test add_i_show_help()
>       @@ -11,6 +11,7 @@
>            Prefix git add -i call with GIT_PAGER_IN_USE=true TERM=vt100
>            to force colored output on Windows.
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>        
>         diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
>    7:  ca2a7c4375 ! 10:  2b4bdce730 add--interactive.perl: use add--helper --show-help for help_cmd
>       @@ -12,6 +12,7 @@
>            to print the numstat, also here we forgo adding a regression test:
>            the Perl script is on its way out (and this patch is part of that journey).
>        
>       +    Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
>            Signed-off-by: Slavica Djukic <slawica92@hotmail.com>
>            Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
>        
>

Re: [PATCH v5 02/10] add--helper: create builtin helper for interactive add

[Johannes Schindelin]

Hi Junio,

On Thu, 21 Feb 2019, Junio C Hamano wrote:

> "Daniel Ferreira via GitGitGadget" <gitgitgadget@gmail.com> writes:
> 
> > diff --git a/git.c b/git.c
> > index 2dd588674f..cb42591f37 100644
> > --- a/git.c
> > +++ b/git.c
> > @@ -444,6 +444,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
> >  
> >  static struct cmd_struct commands[] = {
> >  	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
> > +	{ "add--helper", cmd_add__helper, RUN_SETUP | NEED_WORK_TREE },
> >  	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
> >  	{ "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT },
> >  	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
> 
> When adding a more complex replacement command we often cannot write
> RUN_SETUP nor NEED_WORK_TREE here and instead do the job ourselves
> in cmd_ourcommand() the hard way.  But because this one is only for
> helping "add -i", we can let the git.c::run_builtin() aka "git
> potty" do the hard part, which is very nice.

Sadly, I ran into a quite curious (and seemingly equally insurmountable)
problem with this approach: when I use `system()` to execute a Git
built-in from the Perl script, and when that built-in then consumes even a
single byte of stdin, that file descriptor gets closed in the Perl
process, and no amount of file descriptor duplication and redirecting that
I could come up helped. After calling the built-in helper to run, say, the
`update` command, the main interactive add process always exited on me due
to EOF on stdin, and I could not make it work.

To be sure, this happens only with MSYS2's Perl. If I try the same on
Linux (WSL, really), everything works Just Fine.

So my current approach is actually the other way round: I started
implementing the main loop in C, and implemented all commands except for
`patch` so far, and I think I will just hand off to the Perl script for
that command for now.

Unfortunately that means that my current state looks already quite a bit
different than what you reviewed. My hope is, however, that it will make
for a nice "story" once I have a version to show that I think could be
applied as-is.

Ciao,
Dscho