[PATCH v11 00/22] Convert "git stash" to C builtin

[PATCH v11 00/22] Convert "git stash" to C builtin

[Paul-Sebastian Ungureanu]

Hello,

This is the 11th iteration of C git stash. Here are some of the changes,
based on Thomas's and dscho's suggestions (from mailing list / pull request
#495):

- improved memory management. Now, the callers of `do_create_stash()`
are responsible of freeing the parameter they pass in. Moreover, the
stash message is now a pointer to a buffer (in the previous iteration
it was a pointer to a string). This should make it more clear who is
responsible of freeing the memory.

- added `strbuf_insertf()` which inserts a format string at a given
position in the buffer.

- some minor changes (changed "!oidcmp" to "oideq")

- fixed merge conflicts

Best regards,
Paul

Joel Teichroeb (5):
  stash: improve option parsing test coverage
  stash: convert apply to builtin
  stash: convert drop and clear to builtin
  stash: convert branch to builtin
  stash: convert pop to builtin

Paul-Sebastian Ungureanu (17):
  sha1-name.c: add `get_oidf()` which acts like `get_oid()`
  strbuf.c: add `strbuf_join_argv()`
  strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`
  t3903: modernize style
  stash: rename test cases to be more descriptive
  stash: add tests for `git stash show` config
  stash: mention options in `show` synopsis
  stash: convert list to builtin
  stash: convert show to builtin
  stash: convert store to builtin
  stash: convert create to builtin
  stash: convert push to builtin
  stash: make push -q quiet
  stash: convert save to builtin
  stash: convert `stash--helper.c` into `stash.c`
  stash: optimize `get_untracked_files()` and `check_changes()`
  stash: replace all `write-tree` child processes with API calls

 Documentation/git-stash.txt  |    4 +-
 Makefile                     |    2 +-
 builtin.h                    |    1 +
 builtin/stash.c              | 1596 ++++++++++++++++++++++++++++++++++
 cache.h                      |    1 +
 git-stash.sh                 |  752 ----------------
 git.c                        |    1 +
 sha1-name.c                  |   19 +
 strbuf.c                     |   51 ++
 strbuf.h                     |   16 +
 t/t3903-stash.sh             |  192 ++--
 t/t3907-stash-show-config.sh |   83 ++
 12 files changed, 1897 insertions(+), 821 deletions(-)
 create mode 100644 builtin/stash.c
 delete mode 100755 git-stash.sh
 create mode 100755 t/t3907-stash-show-config.sh

-- 
2.19.1.878.g0482332a22

[PATCH v11 01/22] sha1-name.c: add `get_oidf()` which acts like `get_oid()`

[Paul-Sebastian Ungureanu]

Compared to `get_oid()`, `get_oidf()` has as parameters
a pointer to `object_id`, a printf format string and
additional arguments. This will help simplify the code
in subsequent commits.

Original-idea-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 cache.h     |  1 +
 sha1-name.c | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/cache.h b/cache.h
index 8b1ee42ae9..6f1a549489 100644
--- a/cache.h
+++ b/cache.h
@@ -1334,6 +1334,7 @@ struct object_context {
 	GET_OID_BLOB)
 
 extern int get_oid(const char *str, struct object_id *oid);
+extern int get_oidf(struct object_id *oid, const char *fmt, ...);
 extern int get_oid_commit(const char *str, struct object_id *oid);
 extern int get_oid_committish(const char *str, struct object_id *oid);
 extern int get_oid_tree(const char *str, struct object_id *oid);
diff --git a/sha1-name.c b/sha1-name.c
index faa60f69e3..cf0e8a3f85 100644
--- a/sha1-name.c
+++ b/sha1-name.c
@@ -1542,6 +1542,25 @@ int get_oid(const char *name, struct object_id *oid)
 	return get_oid_with_context(name, 0, oid, &unused);
 }
 
+/*
+ * This returns a non-zero value if the string (built using printf
+ * format and the given arguments) is not a valid object.
+ */
+int get_oidf(struct object_id *oid, const char *fmt, ...)
+{
+	va_list ap;
+	int ret;
+	struct strbuf sb = STRBUF_INIT;
+
+	va_start(ap, fmt);
+	strbuf_vaddf(&sb, fmt, ap);
+	va_end(ap);
+
+	ret = get_oid(sb.buf, oid);
+	strbuf_release(&sb);
+
+	return ret;
+}
 
 /*
  * Many callers know that the user meant to name a commit-ish by
-- 
2.19.1.878.g0482332a22

[PATCH v11 02/22] strbuf.c: add `strbuf_join_argv()`

[Paul-Sebastian Ungureanu]

Implement `strbuf_join_argv()` to join arguments
into a strbuf.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 strbuf.c | 15 +++++++++++++++
 strbuf.h |  7 +++++++
 2 files changed, 22 insertions(+)

diff --git a/strbuf.c b/strbuf.c
index f6a6cf78b9..82e90f1dfe 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -268,6 +268,21 @@ void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 	strbuf_setlen(sb, sb->len + sb2->len);
 }
 
+const char *strbuf_join_argv(struct strbuf *buf,
+			     int argc, const char **argv, char delim)
+{
+	if (!argc)
+		return buf->buf;
+
+	strbuf_addstr(buf, *argv);
+	while (--argc) {
+		strbuf_addch(buf, delim);
+		strbuf_addstr(buf, *(++argv));
+	}
+
+	return buf->buf;
+}
+
 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 {
 	strbuf_grow(sb, n);
diff --git a/strbuf.h b/strbuf.h
index fc40873b65..be02150df3 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -288,6 +288,13 @@ static inline void strbuf_addstr(struct strbuf *sb, const char *s)
  */
 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2);
 
+/**
+ * Join the arguments into a buffer. `delim` is put between every
+ * two arguments.
+ */
+const char *strbuf_join_argv(struct strbuf *buf, int argc,
+			     const char **argv, char delim);
+
 /**
  * This function can be used to expand a format string containing
  * placeholders. To that end, it parses the string and calls the specified
-- 
2.19.1.878.g0482332a22

[PATCH v11 03/22] strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`

[Paul-Sebastian Ungureanu]

Implement `strbuf_insertf()` and `strbuf_vinsertf()` to
insert data using a printf format string.

Original-idea-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 strbuf.c | 36 ++++++++++++++++++++++++++++++++++++
 strbuf.h |  9 +++++++++
 2 files changed, 45 insertions(+)

diff --git a/strbuf.c b/strbuf.c
index 82e90f1dfe..bfbbdadbf3 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -249,6 +249,42 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 	strbuf_splice(sb, pos, 0, data, len);
 }
 
+void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
+{
+	int len, len2;
+	char save;
+	va_list cp;
+
+	if (pos > sb->len)
+		die("`pos' is too far after the end of the buffer");
+	va_copy(cp, ap);
+	len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
+	va_end(cp);
+	if (len < 0)
+		BUG("your vsnprintf is broken (returned %d)", len);
+	if (!len)
+		return; /* nothing to do */
+	if (unsigned_add_overflows(sb->len, len))
+		die("you want to use way too much memory");
+	strbuf_grow(sb, len);
+	memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
+	/* vsnprintf() will append a NUL, overwriting one of our characters */
+	save = sb->buf[pos + len];
+	len2 = vsnprintf(sb->buf + pos, sb->alloc - sb->len, fmt, ap);
+	sb->buf[pos + len] = save;
+	if (len2 != len)
+		BUG("your vsnprintf is broken (returns inconsistent lengths)");
+	strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	strbuf_vinsertf(sb, pos, fmt, ap);
+	va_end(ap);
+}
+
 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 {
 	strbuf_splice(sb, pos, len, "", 0);
diff --git a/strbuf.h b/strbuf.h
index be02150df3..8f8fe01e68 100644
--- a/strbuf.h
+++ b/strbuf.h
@@ -244,6 +244,15 @@ void strbuf_addchars(struct strbuf *sb, int c, size_t n);
  */
 void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
 
+/**
+ * Insert data to the given position of the buffer giving a printf format
+ * string. The contents will be shifted, not overwritten.
+ */
+void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
+		     va_list ap);
+
+void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
+
 /**
  * Remove given amount of data from a given position of the buffer.
  */
-- 
2.19.1.878.g0482332a22

[PATCH v11 04/22] stash: improve option parsing test coverage

[Paul-Sebastian Ungureanu]

From: Joel Teichroeb <joel@teichroeb.net>

In preparation for converting the stash command incrementally to
a builtin command, this patch improves test coverage of the option
parsing. Both for having too many parameters, or too few.

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 t/t3903-stash.sh | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index cd216655b9..4f8aa56021 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -444,6 +444,36 @@ test_expect_failure 'stash file to directory' '
 	test foo = "$(cat file/file)"
 '
 
+test_expect_success 'giving too many ref arguments does not modify files' '
+	git stash clear &&
+	test_when_finished "git reset --hard HEAD" &&
+	echo foo >file2 &&
+	git stash &&
+	echo bar >file2 &&
+	git stash &&
+	test-tool chmtime =123456789 file2 &&
+	for type in apply pop "branch stash-branch"
+	do
+		test_must_fail git stash $type stash@{0} stash@{1} 2>err &&
+		test_i18ngrep "Too many revisions" err &&
+		test 123456789 = $(test-tool chmtime -g file2) || return 1
+	done
+'
+
+test_expect_success 'drop: too many arguments errors out (does nothing)' '
+	git stash list >expect &&
+	test_must_fail git stash drop stash@{0} stash@{1} 2>err &&
+	test_i18ngrep "Too many revisions" err &&
+	git stash list >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'show: too many arguments errors out (does nothing)' '
+	test_must_fail git stash show stash@{0} stash@{1} 2>err 1>out &&
+	test_i18ngrep "Too many revisions" err &&
+	test_must_be_empty out
+'
+
 test_expect_success 'stash create - no changes' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
@@ -479,6 +509,11 @@ test_expect_success 'stash branch - stashes on stack, stash-like argument' '
 	test $(git ls-files --modified | wc -l) -eq 1
 '
 
+test_expect_success 'stash branch complains with no arguments' '
+	test_must_fail git stash branch 2>err &&
+	test_i18ngrep "No branch name specified" err
+'
+
 test_expect_success 'stash show format defaults to --stat' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
-- 
2.19.1.878.g0482332a22

[PATCH v11 05/22] t3903: modernize style

[Paul-Sebastian Ungureanu]

Remove whitespaces after redirection operators and wrap
long lines.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 t/t3903-stash.sh | 120 ++++++++++++++++++++++++-----------------------
 1 file changed, 61 insertions(+), 59 deletions(-)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 4f8aa56021..098a387a82 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -8,22 +8,22 @@ test_description='Test git stash'
 . ./test-lib.sh
 
 test_expect_success 'stash some dirty working directory' '
-	echo 1 > file &&
+	echo 1 >file &&
 	git add file &&
 	echo unrelated >other-file &&
 	git add other-file &&
 	test_tick &&
 	git commit -m initial &&
-	echo 2 > file &&
+	echo 2 >file &&
 	git add file &&
-	echo 3 > file &&
+	echo 3 >file &&
 	test_tick &&
 	git stash &&
 	git diff-files --quiet &&
 	git diff-index --cached --quiet HEAD
 '
 
-cat > expect << EOF
+cat >expect <<EOF
 diff --git a/file b/file
 index 0cfbf08..00750ed 100644
 --- a/file
@@ -35,7 +35,7 @@ EOF
 
 test_expect_success 'parents of stash' '
 	test $(git rev-parse stash^) = $(git rev-parse HEAD) &&
-	git diff stash^2..stash > output &&
+	git diff stash^2..stash >output &&
 	test_cmp expect output
 '
 
@@ -74,7 +74,7 @@ test_expect_success 'apply stashed changes' '
 
 test_expect_success 'apply stashed changes (including index)' '
 	git reset --hard HEAD^ &&
-	echo 6 > other-file &&
+	echo 6 >other-file &&
 	git add other-file &&
 	test_tick &&
 	git commit -m other-file &&
@@ -99,12 +99,12 @@ test_expect_success 'stash drop complains of extra options' '
 
 test_expect_success 'drop top stash' '
 	git reset --hard &&
-	git stash list > stashlist1 &&
-	echo 7 > file &&
+	git stash list >expected &&
+	echo 7 >file &&
 	git stash &&
 	git stash drop &&
-	git stash list > stashlist2 &&
-	test_cmp stashlist1 stashlist2 &&
+	git stash list >actual &&
+	test_cmp expected actual &&
 	git stash apply &&
 	test 3 = $(cat file) &&
 	test 1 = $(git show :file) &&
@@ -113,9 +113,9 @@ test_expect_success 'drop top stash' '
 
 test_expect_success 'drop middle stash' '
 	git reset --hard &&
-	echo 8 > file &&
+	echo 8 >file &&
 	git stash &&
-	echo 9 > file &&
+	echo 9 >file &&
 	git stash &&
 	git stash drop stash@{1} &&
 	test 2 = $(git stash list | wc -l) &&
@@ -160,7 +160,7 @@ test_expect_success 'stash pop' '
 	test 0 = $(git stash list | wc -l)
 '
 
-cat > expect << EOF
+cat >expect <<EOF
 diff --git a/file2 b/file2
 new file mode 100644
 index 0000000..1fe912c
@@ -170,7 +170,7 @@ index 0000000..1fe912c
 +bar2
 EOF
 
-cat > expect1 << EOF
+cat >expect1 <<EOF
 diff --git a/file b/file
 index 257cc56..5716ca5 100644
 --- a/file
@@ -180,7 +180,7 @@ index 257cc56..5716ca5 100644
 +bar
 EOF
 
-cat > expect2 << EOF
+cat >expect2 <<EOF
 diff --git a/file b/file
 index 7601807..5716ca5 100644
 --- a/file
@@ -198,79 +198,79 @@ index 0000000..1fe912c
 EOF
 
 test_expect_success 'stash branch' '
-	echo foo > file &&
+	echo foo >file &&
 	git commit file -m first &&
-	echo bar > file &&
-	echo bar2 > file2 &&
+	echo bar >file &&
+	echo bar2 >file2 &&
 	git add file2 &&
 	git stash &&
-	echo baz > file &&
+	echo baz >file &&
 	git commit file -m second &&
 	git stash branch stashbranch &&
 	test refs/heads/stashbranch = $(git symbolic-ref HEAD) &&
 	test $(git rev-parse HEAD) = $(git rev-parse master^) &&
-	git diff --cached > output &&
+	git diff --cached >output &&
 	test_cmp expect output &&
-	git diff > output &&
+	git diff >output &&
 	test_cmp expect1 output &&
 	git add file &&
 	git commit -m alternate\ second &&
-	git diff master..stashbranch > output &&
+	git diff master..stashbranch >output &&
 	test_cmp output expect2 &&
 	test 0 = $(git stash list | wc -l)
 '
 
 test_expect_success 'apply -q is quiet' '
-	echo foo > file &&
+	echo foo >file &&
 	git stash &&
-	git stash apply -q > output.out 2>&1 &&
+	git stash apply -q >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'save -q is quiet' '
-	git stash save --quiet > output.out 2>&1 &&
+	git stash save --quiet >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'pop -q is quiet' '
-	git stash pop -q > output.out 2>&1 &&
+	git stash pop -q >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'pop -q --index works and is quiet' '
-	echo foo > file &&
+	echo foo >file &&
 	git add file &&
 	git stash save --quiet &&
-	git stash pop -q --index > output.out 2>&1 &&
+	git stash pop -q --index >output.out 2>&1 &&
 	test foo = "$(git show :file)" &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'drop -q is quiet' '
 	git stash &&
-	git stash drop -q > output.out 2>&1 &&
+	git stash drop -q >output.out 2>&1 &&
 	test_must_be_empty output.out
 '
 
 test_expect_success 'stash -k' '
-	echo bar3 > file &&
-	echo bar4 > file2 &&
+	echo bar3 >file &&
+	echo bar4 >file2 &&
 	git add file2 &&
 	git stash -k &&
 	test bar,bar4 = $(cat file),$(cat file2)
 '
 
 test_expect_success 'stash --no-keep-index' '
-	echo bar33 > file &&
-	echo bar44 > file2 &&
+	echo bar33 >file &&
+	echo bar44 >file2 &&
 	git add file2 &&
 	git stash --no-keep-index &&
 	test bar,bar2 = $(cat file),$(cat file2)
 '
 
 test_expect_success 'stash --invalid-option' '
-	echo bar5 > file &&
-	echo bar6 > file2 &&
+	echo bar5 >file &&
+	echo bar6 >file2 &&
 	git add file2 &&
 	test_must_fail git stash --invalid-option &&
 	test_must_fail git stash save --invalid-option &&
@@ -486,11 +486,12 @@ test_expect_success 'stash branch - no stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	git stash branch stash-branch ${STASH_ID} &&
-	test_when_finished "git reset --hard HEAD && git checkout master && git branch -D stash-branch" &&
+	test_when_finished "git reset --hard HEAD && git checkout master &&
+	git branch -D stash-branch" &&
 	test $(git ls-files --modified | wc -l) -eq 1
 '
 
@@ -498,14 +499,15 @@ test_expect_success 'stash branch - stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
-	echo bar >> file &&
+	echo bar >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	git stash branch stash-branch ${STASH_ID} &&
-	test_when_finished "git reset --hard HEAD && git checkout master && git branch -D stash-branch" &&
+	test_when_finished "git reset --hard HEAD && git checkout master &&
+	git branch -D stash-branch" &&
 	test $(git ls-files --modified | wc -l) -eq 1
 '
 
@@ -518,10 +520,10 @@ test_expect_success 'stash show format defaults to --stat' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
-	echo bar >> file &&
+	echo bar >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	cat >expected <<-EOF &&
@@ -536,10 +538,10 @@ test_expect_success 'stash show - stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
-	echo bar >> file &&
+	echo bar >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	echo "1	0	file" >expected &&
@@ -551,10 +553,10 @@ test_expect_success 'stash show -p - stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	git stash &&
 	test_when_finished "git stash drop" &&
-	echo bar >> file &&
+	echo bar >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	cat >expected <<-EOF &&
@@ -574,7 +576,7 @@ test_expect_success 'stash show - no stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	echo "1	0	file" >expected &&
@@ -586,7 +588,7 @@ test_expect_success 'stash show -p - no stashes on stack, stash-like argument' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD" &&
 	git reset --hard &&
-	echo foo >> file &&
+	echo foo >>file &&
 	STASH_ID=$(git stash create) &&
 	git reset --hard &&
 	cat >expected <<-EOF &&
@@ -606,9 +608,9 @@ test_expect_success 'stash drop - fail early if specified stash is not a stash r
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD && git stash clear" &&
 	git reset --hard &&
-	echo foo > file &&
+	echo foo >file &&
 	git stash &&
-	echo bar > file &&
+	echo bar >file &&
 	git stash &&
 	test_must_fail git stash drop $(git rev-parse stash@{0}) &&
 	git stash pop &&
@@ -620,9 +622,9 @@ test_expect_success 'stash pop - fail early if specified stash is not a stash re
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD && git stash clear" &&
 	git reset --hard &&
-	echo foo > file &&
+	echo foo >file &&
 	git stash &&
-	echo bar > file &&
+	echo bar >file &&
 	git stash &&
 	test_must_fail git stash pop $(git rev-parse stash@{0}) &&
 	git stash pop &&
@@ -632,8 +634,8 @@ test_expect_success 'stash pop - fail early if specified stash is not a stash re
 
 test_expect_success 'ref with non-existent reflog' '
 	git stash clear &&
-	echo bar5 > file &&
-	echo bar6 > file2 &&
+	echo bar5 >file &&
+	echo bar6 >file2 &&
 	git add file2 &&
 	git stash &&
 	test_must_fail git rev-parse --quiet --verify does-not-exist &&
@@ -653,8 +655,8 @@ test_expect_success 'ref with non-existent reflog' '
 test_expect_success 'invalid ref of the form stash@{n}, n >= N' '
 	git stash clear &&
 	test_must_fail git stash drop stash@{0} &&
-	echo bar5 > file &&
-	echo bar6 > file2 &&
+	echo bar5 >file &&
+	echo bar6 >file2 &&
 	git add file2 &&
 	git stash &&
 	test_must_fail git stash drop stash@{1} &&
@@ -724,7 +726,7 @@ test_expect_success 'stash apply shows status same as git status (relative to cu
 	test_i18ncmp expect actual
 '
 
-cat > expect << EOF
+cat >expect <<EOF
 diff --git a/HEAD b/HEAD
 new file mode 100644
 index 0000000..fe0cbee
@@ -737,14 +739,14 @@ EOF
 test_expect_success 'stash where working directory contains "HEAD" file' '
 	git stash clear &&
 	git reset --hard &&
-	echo file-not-a-ref > HEAD &&
+	echo file-not-a-ref >HEAD &&
 	git add HEAD &&
 	test_tick &&
 	git stash &&
 	git diff-files --quiet &&
 	git diff-index --cached --quiet HEAD &&
 	test "$(git rev-parse stash^)" = "$(git rev-parse HEAD)" &&
-	git diff stash^..stash > output &&
+	git diff stash^..stash >output &&
 	test_cmp expect output
 '
 
-- 
2.19.1.878.g0482332a22

[PATCH v11 06/22] stash: rename test cases to be more descriptive

[Paul-Sebastian Ungureanu]

Rename some test cases' labels to be more descriptive and under 80
characters per line.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 t/t3903-stash.sh | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 098a387a82..8b09a3d6cc 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -604,7 +604,7 @@ test_expect_success 'stash show -p - no stashes on stack, stash-like argument' '
 	test_cmp expected actual
 '
 
-test_expect_success 'stash drop - fail early if specified stash is not a stash reference' '
+test_expect_success 'drop: fail early if specified stash is not a stash ref' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD && git stash clear" &&
 	git reset --hard &&
@@ -618,7 +618,7 @@ test_expect_success 'stash drop - fail early if specified stash is not a stash r
 	git reset --hard HEAD
 '
 
-test_expect_success 'stash pop - fail early if specified stash is not a stash reference' '
+test_expect_success 'pop: fail early if specified stash is not a stash ref' '
 	git stash clear &&
 	test_when_finished "git reset --hard HEAD && git stash clear" &&
 	git reset --hard &&
@@ -682,7 +682,7 @@ test_expect_success 'invalid ref of the form "n", n >= N' '
 	git stash drop
 '
 
-test_expect_success 'stash branch should not drop the stash if the branch exists' '
+test_expect_success 'branch: do not drop the stash if the branch exists' '
 	git stash clear &&
 	echo foo >file &&
 	git add file &&
@@ -693,7 +693,7 @@ test_expect_success 'stash branch should not drop the stash if the branch exists
 	git rev-parse stash@{0} --
 '
 
-test_expect_success 'stash branch should not drop the stash if the apply fails' '
+test_expect_success 'branch: should not drop the stash if the apply fails' '
 	git stash clear &&
 	git reset HEAD~1 --hard &&
 	echo foo >file &&
@@ -707,7 +707,7 @@ test_expect_success 'stash branch should not drop the stash if the apply fails'
 	git rev-parse stash@{0} --
 '
 
-test_expect_success 'stash apply shows status same as git status (relative to current directory)' '
+test_expect_success 'apply: show same status as git status (relative to ./)' '
 	git stash clear &&
 	echo 1 >subdir/subfile1 &&
 	echo 2 >subdir/subfile2 &&
@@ -1048,7 +1048,7 @@ test_expect_success 'stash push -p with pathspec shows no changes only once' '
 	test_i18ncmp expect actual
 '
 
-test_expect_success 'stash push with pathspec shows no changes when there are none' '
+test_expect_success 'push <pathspec>: show no changes when there are none' '
 	>foo &&
 	git add foo &&
 	git commit -m "tmp" &&
@@ -1058,7 +1058,7 @@ test_expect_success 'stash push with pathspec shows no changes when there are no
 	test_i18ncmp expect actual
 '
 
-test_expect_success 'stash push with pathspec not in the repository errors out' '
+test_expect_success 'push: <pathspec> not in the repository errors out' '
 	>untracked &&
 	test_must_fail git stash push untracked &&
 	test_path_is_file untracked
-- 
2.19.1.878.g0482332a22

[PATCH v11 07/22] stash: add tests for `git stash show` config

[Paul-Sebastian Ungureanu]

This commit introduces tests for `git stash show`
config. It tests all the cases where `stash.showStat`
and `stash.showPatch` are unset or set to true / false.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 t/t3907-stash-show-config.sh | 83 ++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100755 t/t3907-stash-show-config.sh

diff --git a/t/t3907-stash-show-config.sh b/t/t3907-stash-show-config.sh
new file mode 100755
index 0000000000..10914bba7b
--- /dev/null
+++ b/t/t3907-stash-show-config.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+test_description='Test git stash show configuration.'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	test_commit file
+'
+
+# takes three parameters:
+# 1. the stash.showStat value (or "<unset>")
+# 2. the stash.showPatch value (or "<unset>")
+# 3. the diff options of the expected output (or nothing for no output)
+test_stat_and_patch () {
+	if test "<unset>" = "$1"
+	then
+		test_unconfig stash.showStat
+	else
+		test_config stash.showStat "$1"
+	fi &&
+
+	if test "<unset>" = "$2"
+	then
+		test_unconfig stash.showPatch
+	else
+		test_config stash.showPatch "$2"
+	fi &&
+
+	shift 2 &&
+	echo 2 >file.t &&
+	if test $# != 0
+	then
+		git diff "$@" >expect
+	fi &&
+	git stash &&
+	git stash show >actual &&
+
+	if test $# = 0
+	then
+		test_must_be_empty actual
+	else
+		test_cmp expect actual
+	fi
+}
+
+test_expect_success 'showStat unset showPatch unset' '
+	test_stat_and_patch "<unset>" "<unset>" --stat
+'
+
+test_expect_success 'showStat unset showPatch false' '
+	test_stat_and_patch "<unset>" false --stat
+'
+
+test_expect_success 'showStat unset showPatch true' '
+	test_stat_and_patch "<unset>" true --stat -p
+'
+
+test_expect_success 'showStat false showPatch unset' '
+	test_stat_and_patch false "<unset>"
+'
+
+test_expect_success 'showStat false showPatch false' '
+	test_stat_and_patch false false
+'
+
+test_expect_success 'showStat false showPatch true' '
+	test_stat_and_patch false true -p
+'
+
+test_expect_success 'showStat true showPatch unset' '
+	test_stat_and_patch true "<unset>" --stat
+'
+
+test_expect_success 'showStat true showPatch false' '
+	test_stat_and_patch true false --stat
+'
+
+test_expect_success 'showStat true showPatch true' '
+	test_stat_and_patch true true --stat -p
+'
+
+test_done
-- 
2.19.1.878.g0482332a22

[PATCH v11 08/22] stash: mention options in `show` synopsis

[Paul-Sebastian Ungureanu]

Mention in the documentation, that `show` accepts any
option known to `git diff`.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 Documentation/git-stash.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-stash.txt b/Documentation/git-stash.txt
index 7ef8c47911..e31ea7d303 100644
--- a/Documentation/git-stash.txt
+++ b/Documentation/git-stash.txt
@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 'git stash' list [<options>]
-'git stash' show [<stash>]
+'git stash' show [<options>] [<stash>]
 'git stash' drop [-q|--quiet] [<stash>]
 'git stash' ( pop | apply ) [--index] [-q|--quiet] [<stash>]
 'git stash' branch <branchname> [<stash>]
@@ -106,7 +106,7 @@ stash@{1}: On master: 9cc0589... Add git-stash
 The command takes options applicable to the 'git log'
 command to control what is shown and how. See linkgit:git-log[1].
 
-show [<stash>]::
+show [<options>] [<stash>]::
 
 	Show the changes recorded in the stash entry as a diff between the
 	stashed contents and the commit back when the stash entry was first
-- 
2.19.1.878.g0482332a22

[PATCH v11 09/22] stash: convert apply to builtin

[Paul-Sebastian Ungureanu]

From: Joel Teichroeb <joel@teichroeb.net>

Add a builtin helper for performing stash commands. Converting
all at once proved hard to review, so starting with just apply
lets conversion get started without the other commands being
finished.

The helper is being implemented as a drop in replacement for
stash so that when it is complete it can simply be renamed and
the shell script deleted.

Delete the contents of the apply_stash shell function and replace
it with a call to stash--helper apply until pop is also
converted.

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 .gitignore              |   1 +
 Makefile                |   1 +
 builtin.h               |   1 +
 builtin/stash--helper.c | 452 ++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            |  78 +------
 git.c                   |   1 +
 6 files changed, 463 insertions(+), 71 deletions(-)
 create mode 100644 builtin/stash--helper.c

diff --git a/.gitignore b/.gitignore
index 0d77ea5894..6ecab90ab2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -162,6 +162,7 @@
 /git-show-ref
 /git-stage
 /git-stash
+/git-stash--helper
 /git-status
 /git-stripspace
 /git-submodule
diff --git a/Makefile b/Makefile
index bbfbb4292d..aa83545e94 100644
--- a/Makefile
+++ b/Makefile
@@ -1115,6 +1115,7 @@ BUILTIN_OBJS += builtin/shortlog.o
 BUILTIN_OBJS += builtin/show-branch.o
 BUILTIN_OBJS += builtin/show-index.o
 BUILTIN_OBJS += builtin/show-ref.o
+BUILTIN_OBJS += builtin/stash--helper.o
 BUILTIN_OBJS += builtin/stripspace.o
 BUILTIN_OBJS += builtin/submodule--helper.o
 BUILTIN_OBJS += builtin/symbolic-ref.o
diff --git a/builtin.h b/builtin.h
index 6538932e99..ff4460aff7 100644
--- a/builtin.h
+++ b/builtin.h
@@ -225,6 +225,7 @@ extern int cmd_show(int argc, const char **argv, const char *prefix);
 extern int cmd_show_branch(int argc, const char **argv, const char *prefix);
 extern int cmd_show_index(int argc, const char **argv, const char *prefix);
 extern int cmd_status(int argc, const char **argv, const char *prefix);
+extern int cmd_stash__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_stripspace(int argc, const char **argv, const char *prefix);
 extern int cmd_submodule__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_symbolic_ref(int argc, const char **argv, const char *prefix);
diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
new file mode 100644
index 0000000000..997b1c0ecf
--- /dev/null
+++ b/builtin/stash--helper.c
@@ -0,0 +1,452 @@
+#include "builtin.h"
+#include "config.h"
+#include "parse-options.h"
+#include "refs.h"
+#include "lockfile.h"
+#include "cache-tree.h"
+#include "unpack-trees.h"
+#include "merge-recursive.h"
+#include "argv-array.h"
+#include "run-command.h"
+#include "dir.h"
+#include "rerere.h"
+
+static const char * const git_stash_helper_usage[] = {
+	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+	NULL
+};
+
+static const char * const git_stash_helper_apply_usage[] = {
+	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+	NULL
+};
+
+static const char *ref_stash = "refs/stash";
+static struct strbuf stash_index_path = STRBUF_INIT;
+
+/*
+ * w_commit is set to the commit containing the working tree
+ * b_commit is set to the base commit
+ * i_commit is set to the commit containing the index tree
+ * u_commit is set to the commit containing the untracked files tree
+ * w_tree is set to the working tree
+ * b_tree is set to the base tree
+ * i_tree is set to the index tree
+ * u_tree is set to the untracked files tree
+ */
+
+struct stash_info {
+	struct object_id w_commit;
+	struct object_id b_commit;
+	struct object_id i_commit;
+	struct object_id u_commit;
+	struct object_id w_tree;
+	struct object_id b_tree;
+	struct object_id i_tree;
+	struct object_id u_tree;
+	struct strbuf revision;
+	int is_stash_ref;
+	int has_u;
+};
+
+static void free_stash_info(struct stash_info *info)
+{
+	strbuf_release(&info->revision);
+}
+
+static void assert_stash_like(struct stash_info *info, const char *revision)
+{
+	if (get_oidf(&info->b_commit, "%s^1", revision) ||
+	    get_oidf(&info->w_tree, "%s:", revision) ||
+	    get_oidf(&info->b_tree, "%s^1:", revision) ||
+	    get_oidf(&info->i_tree, "%s^2:", revision))
+		die(_("'%s' is not a stash-like commit"), revision);
+}
+
+static int get_stash_info(struct stash_info *info, int argc, const char **argv)
+{
+	int ret;
+	char *end_of_rev;
+	char *expanded_ref;
+	const char *revision;
+	const char *commit = NULL;
+	struct object_id dummy;
+	struct strbuf symbolic = STRBUF_INIT;
+
+	if (argc > 1) {
+		int i;
+		struct strbuf refs_msg = STRBUF_INIT;
+
+		for (i = 0; i < argc; i++)
+			strbuf_addf(&refs_msg, " '%s'", argv[i]);
+
+		fprintf_ln(stderr, _("Too many revisions specified:%s"),
+			   refs_msg.buf);
+		strbuf_release(&refs_msg);
+
+		return -1;
+	}
+
+	if (argc == 1)
+		commit = argv[0];
+
+	strbuf_init(&info->revision, 0);
+	if (!commit) {
+		if (!ref_exists(ref_stash)) {
+			free_stash_info(info);
+			fprintf_ln(stderr, _("No stash entries found."));
+			return -1;
+		}
+
+		strbuf_addf(&info->revision, "%s@{0}", ref_stash);
+	} else if (strspn(commit, "0123456789") == strlen(commit)) {
+		strbuf_addf(&info->revision, "%s@{%s}", ref_stash, commit);
+	} else {
+		strbuf_addstr(&info->revision, commit);
+	}
+
+	revision = info->revision.buf;
+
+	if (get_oid(revision, &info->w_commit)) {
+		error(_("%s is not a valid reference"), revision);
+		free_stash_info(info);
+		return -1;
+	}
+
+	assert_stash_like(info, revision);
+
+	info->has_u = !get_oidf(&info->u_tree, "%s^3:", revision);
+
+	end_of_rev = strchrnul(revision, '@');
+	strbuf_add(&symbolic, revision, end_of_rev - revision);
+
+	ret = dwim_ref(symbolic.buf, symbolic.len, &dummy, &expanded_ref);
+	strbuf_release(&symbolic);
+	switch (ret) {
+	case 0: /* Not found, but valid ref */
+		info->is_stash_ref = 0;
+		break;
+	case 1:
+		info->is_stash_ref = !strcmp(expanded_ref, ref_stash);
+		break;
+	default: /* Invalid or ambiguous */
+		free_stash_info(info);
+	}
+
+	free(expanded_ref);
+	return !(ret == 0 || ret == 1);
+}
+
+static int reset_tree(struct object_id *i_tree, int update, int reset)
+{
+	int nr_trees = 1;
+	struct unpack_trees_options opts;
+	struct tree_desc t[MAX_UNPACK_TREES];
+	struct tree *tree;
+	struct lock_file lock_file = LOCK_INIT;
+
+	read_cache_preload(NULL);
+	if (refresh_cache(REFRESH_QUIET))
+		return -1;
+
+	hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
+
+	memset(&opts, 0, sizeof(opts));
+
+	tree = parse_tree_indirect(i_tree);
+	if (parse_tree(tree))
+		return -1;
+
+	init_tree_desc(t, tree->buffer, tree->size);
+
+	opts.head_idx = 1;
+	opts.src_index = &the_index;
+	opts.dst_index = &the_index;
+	opts.merge = 1;
+	opts.reset = reset;
+	opts.update = update;
+	opts.fn = oneway_merge;
+
+	if (unpack_trees(nr_trees, t, &opts))
+		return -1;
+
+	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
+		return error(_("unable to write new index file"));
+
+	return 0;
+}
+
+static int diff_tree_binary(struct strbuf *out, struct object_id *w_commit)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	const char *w_commit_hex = oid_to_hex(w_commit);
+
+	/*
+	 * Diff-tree would not be very hard to replace with a native function,
+	 * however it should be done together with apply_cached.
+	 */
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "diff-tree", "--binary", NULL);
+	argv_array_pushf(&cp.args, "%s^2^..%s^2", w_commit_hex, w_commit_hex);
+
+	return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
+}
+
+static int apply_cached(struct strbuf *out)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * Apply currently only reads either from stdin or a file, thus
+	 * apply_all_patches would have to be updated to optionally take a
+	 * buffer.
+	 */
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "apply", "--cached", NULL);
+	return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
+}
+
+static int reset_head(void)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * Reset is overall quite simple, however there is no current public
+	 * API for resetting.
+	 */
+	cp.git_cmd = 1;
+	argv_array_push(&cp.args, "reset");
+
+	return run_command(&cp);
+}
+
+static int get_newly_staged(struct strbuf *out, struct object_id *c_tree)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	const char *c_tree_hex = oid_to_hex(c_tree);
+
+	/*
+	 * diff-index is very similar to diff-tree above, and should be
+	 * converted together with update_index.
+	 */
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "diff-index", "--cached", "--name-only",
+			 "--diff-filter=A", NULL);
+	argv_array_push(&cp.args, c_tree_hex);
+	return pipe_command(&cp, NULL, 0, out, 0, NULL, 0);
+}
+
+static int update_index(struct strbuf *out)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * Update-index is very complicated and may need to have a public
+	 * function exposed in order to remove this forking.
+	 */
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "update-index", "--add", "--stdin", NULL);
+	return pipe_command(&cp, out->buf, out->len, NULL, 0, NULL, 0);
+}
+
+static int restore_untracked(struct object_id *u_tree)
+{
+	int res;
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * We need to run restore files from a given index, but without
+	 * affecting the current index, so we use GIT_INDEX_FILE with
+	 * run_command to fork processes that will not interfere.
+	 */
+	cp.git_cmd = 1;
+	argv_array_push(&cp.args, "read-tree");
+	argv_array_push(&cp.args, oid_to_hex(u_tree));
+	argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (run_command(&cp)) {
+		remove_path(stash_index_path.buf);
+		return -1;
+	}
+
+	child_process_init(&cp);
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "checkout-index", "--all", NULL);
+	argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+
+	res = run_command(&cp);
+	remove_path(stash_index_path.buf);
+	return res;
+}
+
+static int do_apply_stash(const char *prefix, struct stash_info *info,
+			  int index, int quiet)
+{
+	int ret;
+	int has_index = index;
+	struct merge_options o;
+	struct object_id c_tree;
+	struct object_id index_tree;
+	struct commit *result;
+	const struct object_id *bases[1];
+
+	read_cache_preload(NULL);
+	if (refresh_cache(REFRESH_QUIET))
+		return -1;
+
+	if (write_cache_as_tree(&c_tree, 0, NULL) || reset_tree(&c_tree, 0, 0))
+		return error(_("cannot apply a stash in the middle of a merge"));
+
+	if (index) {
+		if (oideq(&info->b_tree, &info->i_tree) ||
+		    oideq(&c_tree, &info->i_tree)) {
+			has_index = 0;
+		} else {
+			struct strbuf out = STRBUF_INIT;
+
+			if (diff_tree_binary(&out, &info->w_commit)) {
+				strbuf_release(&out);
+				return error(_("could not generate diff %s^!."),
+					     oid_to_hex(&info->w_commit));
+			}
+
+			ret = apply_cached(&out);
+			strbuf_release(&out);
+			if (ret)
+				return error(_("conflicts in index."
+					       "Try without --index."));
+
+			discard_cache();
+			read_cache();
+			if (write_cache_as_tree(&index_tree, 0, NULL))
+				return error(_("could not save index tree"));
+
+			reset_head();
+		}
+	}
+
+	if (info->has_u && restore_untracked(&info->u_tree))
+		return error(_("could not restore untracked files from stash"));
+
+	init_merge_options(&o);
+
+	o.branch1 = "Updated upstream";
+	o.branch2 = "Stashed changes";
+
+	if (oideq(&info->b_tree, &c_tree))
+		o.branch1 = "Version stash was based on";
+
+	if (quiet)
+		o.verbosity = 0;
+
+	if (o.verbosity >= 3)
+		printf_ln(_("Merging %s with %s"), o.branch1, o.branch2);
+
+	bases[0] = &info->b_tree;
+
+	ret = merge_recursive_generic(&o, &c_tree, &info->w_tree, 1, bases,
+				      &result);
+	if (ret) {
+		rerere(0);
+
+		if (index)
+			fprintf_ln(stderr, _("Index was not unstashed."));
+
+		return ret;
+	}
+
+	if (has_index) {
+		if (reset_tree(&index_tree, 0, 0))
+			return -1;
+	} else {
+		struct strbuf out = STRBUF_INIT;
+
+		if (get_newly_staged(&out, &c_tree)) {
+			strbuf_release(&out);
+			return -1;
+		}
+
+		if (reset_tree(&c_tree, 0, 1)) {
+			strbuf_release(&out);
+			return -1;
+		}
+
+		ret = update_index(&out);
+		strbuf_release(&out);
+		if (ret)
+			return -1;
+
+		discard_cache();
+	}
+
+	if (quiet) {
+		if (refresh_cache(REFRESH_QUIET))
+			warning("could not refresh index");
+	} else {
+		struct child_process cp = CHILD_PROCESS_INIT;
+
+		/*
+		 * Status is quite simple and could be replaced with calls to
+		 * wt_status in the future, but it adds complexities which may
+		 * require more tests.
+		 */
+		cp.git_cmd = 1;
+		cp.dir = prefix;
+		argv_array_push(&cp.args, "status");
+		run_command(&cp);
+	}
+
+	return 0;
+}
+
+static int apply_stash(int argc, const char **argv, const char *prefix)
+{
+	int ret;
+	int quiet = 0;
+	int index = 0;
+	struct stash_info info;
+	struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+		OPT_BOOL(0, "index", &index,
+			 N_("attempt to recreate the index")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_apply_usage, 0);
+
+	if (get_stash_info(&info, argc, argv))
+		return -1;
+
+	ret = do_apply_stash(prefix, &info, index, quiet);
+	free_stash_info(&info);
+	return ret;
+}
+
+int cmd_stash__helper(int argc, const char **argv, const char *prefix)
+{
+	pid_t pid = getpid();
+	const char *index_file;
+
+	struct option options[] = {
+		OPT_END()
+	};
+
+	git_config(git_default_config, NULL);
+
+	argc = parse_options(argc, argv, prefix, options, git_stash_helper_usage,
+			     PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
+
+	index_file = get_index_file();
+	strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
+		    (uintmax_t)pid);
+
+	if (argc < 1)
+		usage_with_options(git_stash_helper_usage, options);
+	if (!strcmp(argv[0], "apply"))
+		return !!apply_stash(argc, argv, prefix);
+
+	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
+		      git_stash_helper_usage, options);
+}
diff --git a/git-stash.sh b/git-stash.sh
index 94793c1a91..809b1c2d1d 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -566,76 +566,11 @@ assert_stash_ref() {
 }
 
 apply_stash () {
-
-	assert_stash_like "$@"
-
-	git update-index -q --refresh || die "$(gettext "unable to refresh index")"
-
-	# current index state
-	c_tree=$(git write-tree) ||
-		die "$(gettext "Cannot apply a stash in the middle of a merge")"
-
-	unstashed_index_tree=
-	if test -n "$INDEX_OPTION" && test "$b_tree" != "$i_tree" &&
-			test "$c_tree" != "$i_tree"
-	then
-		git diff-tree --binary $s^2^..$s^2 | git apply --cached
-		test $? -ne 0 &&
-			die "$(gettext "Conflicts in index. Try without --index.")"
-		unstashed_index_tree=$(git write-tree) ||
-			die "$(gettext "Could not save index tree")"
-		git reset
-	fi
-
-	if test -n "$u_tree"
-	then
-		GIT_INDEX_FILE="$TMPindex" git read-tree "$u_tree" &&
-		GIT_INDEX_FILE="$TMPindex" git checkout-index --all &&
-		rm -f "$TMPindex" ||
-		die "$(gettext "Could not restore untracked files from stash entry")"
-	fi
-
-	eval "
-		GITHEAD_$w_tree='Stashed changes' &&
-		GITHEAD_$c_tree='Updated upstream' &&
-		GITHEAD_$b_tree='Version stash was based on' &&
-		export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
-	"
-
-	if test -n "$GIT_QUIET"
-	then
-		GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
-	fi
-	if git merge-recursive $b_tree -- $c_tree $w_tree
-	then
-		# No conflict
-		if test -n "$unstashed_index_tree"
-		then
-			git read-tree "$unstashed_index_tree"
-		else
-			a="$TMP-added" &&
-			git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
-			git read-tree --reset $c_tree &&
-			git update-index --add --stdin <"$a" ||
-				die "$(gettext "Cannot unstage modified files")"
-			rm -f "$a"
-		fi
-		squelch=
-		if test -n "$GIT_QUIET"
-		then
-			squelch='>/dev/null 2>&1'
-		fi
-		(cd "$START_DIR" && eval "git status $squelch") || :
-	else
-		# Merge conflict; keep the exit status from merge-recursive
-		status=$?
-		git rerere
-		if test -n "$INDEX_OPTION"
-		then
-			gettextln "Index was not unstashed." >&2
-		fi
-		exit $status
-	fi
+	cd "$START_DIR"
+	git stash--helper apply "$@"
+	res=$?
+	cd_to_toplevel
+	return $res
 }
 
 pop_stash() {
@@ -713,7 +648,8 @@ push)
 	;;
 apply)
 	shift
-	apply_stash "$@"
+	cd "$START_DIR"
+	git stash--helper apply "$@"
 	;;
 clear)
 	shift
diff --git a/git.c b/git.c
index 2f604a41ea..76ee02802e 100644
--- a/git.c
+++ b/git.c
@@ -554,6 +554,7 @@ static struct cmd_struct commands[] = {
 	{ "show-index", cmd_show_index },
 	{ "show-ref", cmd_show_ref, RUN_SETUP },
 	{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	{ "stash--helper", cmd_stash__helper, RUN_SETUP | NEED_WORK_TREE },
 	{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 	{ "stripspace", cmd_stripspace },
 	{ "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
-- 
2.19.1.878.g0482332a22

[PATCH v11 10/22] stash: convert drop and clear to builtin

[Paul-Sebastian Ungureanu]

From: Joel Teichroeb <joel@teichroeb.net>

Add the drop and clear commands to the builtin helper. These two
are each simple, but are being added together as they are quite
related.

We have to unfortunately keep the drop and clear functions in the
shell script as functions are called with parameters internally
that are not valid when the commands are called externally. Once
pop is converted they can both be removed.

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 117 ++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            |   4 +-
 2 files changed, 119 insertions(+), 2 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 997b1c0ecf..07b8ec5bcb 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -12,7 +12,14 @@
 #include "rerere.h"
 
 static const char * const git_stash_helper_usage[] = {
+	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+	N_("git stash--helper clear"),
+	NULL
+};
+
+static const char * const git_stash_helper_drop_usage[] = {
+	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	NULL
 };
 
@@ -21,6 +28,11 @@ static const char * const git_stash_helper_apply_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_clear_usage[] = {
+	N_("git stash--helper clear"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -137,6 +149,32 @@ static int get_stash_info(struct stash_info *info, int argc, const char **argv)
 	return !(ret == 0 || ret == 1);
 }
 
+static int do_clear_stash(void)
+{
+	struct object_id obj;
+	if (get_oid(ref_stash, &obj))
+		return 0;
+
+	return delete_ref(NULL, ref_stash, &obj, 0);
+}
+
+static int clear_stash(int argc, const char **argv, const char *prefix)
+{
+	struct option options[] = {
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_clear_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (argc)
+		return error(_("git stash clear with parameters is "
+			       "unimplemented"));
+
+	return do_clear_stash();
+}
+
 static int reset_tree(struct object_id *i_tree, int update, int reset)
 {
 	int nr_trees = 1;
@@ -424,6 +462,81 @@ static int apply_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
+static int do_drop_stash(const char *prefix, struct stash_info *info, int quiet)
+{
+	int ret;
+	struct child_process cp_reflog = CHILD_PROCESS_INIT;
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	/*
+	 * reflog does not provide a simple function for deleting refs. One will
+	 * need to be added to avoid implementing too much reflog code here
+	 */
+
+	cp_reflog.git_cmd = 1;
+	argv_array_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
+			 "--rewrite", NULL);
+	argv_array_push(&cp_reflog.args, info->revision.buf);
+	ret = run_command(&cp_reflog);
+	if (!ret) {
+		if (!quiet)
+			printf_ln(_("Dropped %s (%s)"), info->revision.buf,
+				  oid_to_hex(&info->w_commit));
+	} else {
+		return error(_("%s: Could not drop stash entry"),
+			     info->revision.buf);
+	}
+
+	/*
+	 * This could easily be replaced by get_oid, but currently it will throw
+	 * a fatal error when a reflog is empty, which we can not recover from.
+	 */
+	cp.git_cmd = 1;
+	/* Even though --quiet is specified, rev-parse still outputs the hash */
+	cp.no_stdout = 1;
+	argv_array_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
+	argv_array_pushf(&cp.args, "%s@{0}", ref_stash);
+	ret = run_command(&cp);
+
+	/* do_clear_stash if we just dropped the last stash entry */
+	if (ret)
+		do_clear_stash();
+
+	return 0;
+}
+
+static void assert_stash_ref(struct stash_info *info)
+{
+	if (!info->is_stash_ref) {
+		free_stash_info(info);
+		error(_("'%s' is not a stash reference"), info->revision.buf);
+		exit(128);
+	}
+}
+
+static int drop_stash(int argc, const char **argv, const char *prefix)
+{
+	int ret;
+	int quiet = 0;
+	struct stash_info info;
+	struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_drop_usage, 0);
+
+	if (get_stash_info(&info, argc, argv))
+		return -1;
+
+	assert_stash_ref(&info);
+
+	ret = do_drop_stash(prefix, &info, quiet);
+	free_stash_info(&info);
+	return ret;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -446,6 +559,10 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		usage_with_options(git_stash_helper_usage, options);
 	if (!strcmp(argv[0], "apply"))
 		return !!apply_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "clear"))
+		return !!clear_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "drop"))
+		return !!drop_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 809b1c2d1d..a99d5dc9e5 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -653,7 +653,7 @@ apply)
 	;;
 clear)
 	shift
-	clear_stash "$@"
+	git stash--helper clear "$@"
 	;;
 create)
 	shift
@@ -665,7 +665,7 @@ store)
 	;;
 drop)
 	shift
-	drop_stash "$@"
+	git stash--helper drop "$@"
 	;;
 pop)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 11/22] stash: convert branch to builtin

[Paul-Sebastian Ungureanu]

From: Joel Teichroeb <joel@teichroeb.net>

Add stash branch to the helper and delete the apply_to_branch
function from the shell script.

Checkout does not currently provide a function for checking out
a branch as cmd_checkout does a large amount of sanity checks
first that we require here.

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 46 +++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            | 17 ++-------------
 2 files changed, 48 insertions(+), 15 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 07b8ec5bcb..68b65165e4 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -14,6 +14,7 @@
 static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+	N_("git stash--helper branch <branchname> [<stash>]"),
 	N_("git stash--helper clear"),
 	NULL
 };
@@ -28,6 +29,11 @@ static const char * const git_stash_helper_apply_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_branch_usage[] = {
+	N_("git stash--helper branch <branchname> [<stash>]"),
+	NULL
+};
+
 static const char * const git_stash_helper_clear_usage[] = {
 	N_("git stash--helper clear"),
 	NULL
@@ -537,6 +543,44 @@ static int drop_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
+static int branch_stash(int argc, const char **argv, const char *prefix)
+{
+	int ret;
+	const char *branch = NULL;
+	struct stash_info info;
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct option options[] = {
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_branch_usage, 0);
+
+	if (!argc) {
+		fprintf_ln(stderr, _("No branch name specified"));
+		return -1;
+	}
+
+	branch = argv[0];
+
+	if (get_stash_info(&info, argc - 1, argv + 1))
+		return -1;
+
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "checkout", "-b", NULL);
+	argv_array_push(&cp.args, branch);
+	argv_array_push(&cp.args, oid_to_hex(&info.b_commit));
+	ret = run_command(&cp);
+	if (!ret)
+		ret = do_apply_stash(prefix, &info, 1, 0);
+	if (!ret && info.is_stash_ref)
+		ret = do_drop_stash(prefix, &info, 0);
+
+	free_stash_info(&info);
+
+	return ret;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -563,6 +607,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!clear_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "drop"))
 		return !!drop_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "branch"))
+		return !!branch_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index a99d5dc9e5..29d9f44255 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -598,20 +598,6 @@ drop_stash () {
 	clear_stash
 }
 
-apply_to_branch () {
-	test -n "$1" || die "$(gettext "No branch name specified")"
-	branch=$1
-	shift 1
-
-	set -- --index "$@"
-	assert_stash_like "$@"
-
-	git checkout -b $branch $REV^ &&
-	apply_stash "$@" && {
-		test -z "$IS_STASH_REF" || drop_stash "$@"
-	}
-}
-
 test "$1" = "-p" && set "push" "$@"
 
 PARSE_CACHE='--not-parsed'
@@ -673,7 +659,8 @@ pop)
 	;;
 branch)
 	shift
-	apply_to_branch "$@"
+	cd "$START_DIR"
+	git stash--helper branch "$@"
 	;;
 *)
 	case $# in
-- 
2.19.1.878.g0482332a22

[PATCH v11 12/22] stash: convert pop to builtin

[Paul-Sebastian Ungureanu]

From: Joel Teichroeb <joel@teichroeb.net>

Add stash pop to the helper and delete the pop_stash, drop_stash,
assert_stash_ref functions from the shell script now that they
are no longer needed.

Signed-off-by: Joel Teichroeb <joel@teichroeb.net>
Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 39 +++++++++++++++++++++++++++++++++-
 git-stash.sh            | 47 ++---------------------------------------
 2 files changed, 40 insertions(+), 46 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 68b65165e4..d7ff78784b 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -13,7 +13,7 @@
 
 static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
-	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+	N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
 	N_("git stash--helper branch <branchname> [<stash>]"),
 	N_("git stash--helper clear"),
 	NULL
@@ -24,6 +24,11 @@ static const char * const git_stash_helper_drop_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_pop_usage[] = {
+	N_("git stash--helper pop [--index] [-q|--quiet] [<stash>]"),
+	NULL
+};
+
 static const char * const git_stash_helper_apply_usage[] = {
 	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
 	NULL
@@ -543,6 +548,36 @@ static int drop_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
+static int pop_stash(int argc, const char **argv, const char *prefix)
+{
+	int ret;
+	int index = 0;
+	int quiet = 0;
+	struct stash_info info;
+	struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+		OPT_BOOL(0, "index", &index,
+			 N_("attempt to recreate the index")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_pop_usage, 0);
+
+	if (get_stash_info(&info, argc, argv))
+		return -1;
+
+	assert_stash_ref(&info);
+	if ((ret = do_apply_stash(prefix, &info, index, quiet)))
+		printf_ln(_("The stash entry is kept in case "
+			    "you need it again."));
+	else
+		ret = do_drop_stash(prefix, &info, quiet);
+
+	free_stash_info(&info);
+	return ret;
+}
+
 static int branch_stash(int argc, const char **argv, const char *prefix)
 {
 	int ret;
@@ -607,6 +642,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!clear_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "drop"))
 		return !!drop_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "pop"))
+		return !!pop_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "branch"))
 		return !!branch_stash(argc, argv, prefix);
 
diff --git a/git-stash.sh b/git-stash.sh
index 29d9f44255..8f2640fe90 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -554,50 +554,6 @@ assert_stash_like() {
 	}
 }
 
-is_stash_ref() {
-	is_stash_like "$@" && test -n "$IS_STASH_REF"
-}
-
-assert_stash_ref() {
-	is_stash_ref "$@" || {
-		args="$*"
-		die "$(eval_gettext "'\$args' is not a stash reference")"
-	}
-}
-
-apply_stash () {
-	cd "$START_DIR"
-	git stash--helper apply "$@"
-	res=$?
-	cd_to_toplevel
-	return $res
-}
-
-pop_stash() {
-	assert_stash_ref "$@"
-
-	if apply_stash "$@"
-	then
-		drop_stash "$@"
-	else
-		status=$?
-		say "$(gettext "The stash entry is kept in case you need it again.")"
-		exit $status
-	fi
-}
-
-drop_stash () {
-	assert_stash_ref "$@"
-
-	git reflog delete --updateref --rewrite "${REV}" &&
-		say "$(eval_gettext "Dropped \${REV} (\$s)")" ||
-		die "$(eval_gettext "\${REV}: Could not drop stash entry")"
-
-	# clear_stash if we just dropped the last stash entry
-	git rev-parse --verify --quiet "$ref_stash@{0}" >/dev/null ||
-	clear_stash
-}
-
 test "$1" = "-p" && set "push" "$@"
 
 PARSE_CACHE='--not-parsed'
@@ -655,7 +611,8 @@ drop)
 	;;
 pop)
 	shift
-	pop_stash "$@"
+	cd "$START_DIR"
+	git stash--helper pop "$@"
 	;;
 branch)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 13/22] stash: convert list to builtin

[Paul-Sebastian Ungureanu]

Add stash list to the helper and delete the list_stash function
from the shell script.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 31 +++++++++++++++++++++++++++++++
 git-stash.sh            |  7 +------
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index d7ff78784b..d66a4589a5 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -12,6 +12,7 @@
 #include "rerere.h"
 
 static const char * const git_stash_helper_usage[] = {
+	N_("git stash--helper list [<options>]"),
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
 	N_("git stash--helper branch <branchname> [<stash>]"),
@@ -19,6 +20,11 @@ static const char * const git_stash_helper_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_list_usage[] = {
+	N_("git stash--helper list [<options>]"),
+	NULL
+};
+
 static const char * const git_stash_helper_drop_usage[] = {
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	NULL
@@ -616,6 +622,29 @@ static int branch_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
+static int list_stash(int argc, const char **argv, const char *prefix)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct option options[] = {
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_list_usage,
+			     PARSE_OPT_KEEP_UNKNOWN);
+
+	if (!ref_exists(ref_stash))
+		return 0;
+
+	cp.git_cmd = 1;
+	argv_array_pushl(&cp.args, "log", "--format=%gd: %gs", "-g",
+			 "--first-parent", "-m", NULL);
+	argv_array_pushv(&cp.args, argv);
+	argv_array_push(&cp.args, ref_stash);
+	argv_array_push(&cp.args, "--");
+	return run_command(&cp);
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -646,6 +675,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!pop_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "branch"))
 		return !!branch_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "list"))
+		return !!list_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 8f2640fe90..6052441aa2 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -382,11 +382,6 @@ have_stash () {
 	git rev-parse --verify --quiet $ref_stash >/dev/null
 }
 
-list_stash () {
-	have_stash || return 0
-	git log --format="%gd: %gs" -g --first-parent -m "$@" $ref_stash --
-}
-
 show_stash () {
 	ALLOW_UNKNOWN_FLAGS=t
 	assert_stash_like "$@"
@@ -574,7 +569,7 @@ test -n "$seen_non_option" || set "push" "$@"
 case "$1" in
 list)
 	shift
-	list_stash "$@"
+	git stash--helper list "$@"
 	;;
 show)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 14/22] stash: convert show to builtin

[Paul-Sebastian Ungureanu]

Add stash show to the helper and delete the show_stash, have_stash,
assert_stash_like, is_stash_like and parse_flags_and_rev functions
from the shell script now that they are no longer needed.

In shell version, although `git stash show` accepts `--index` and
`--quiet` options, it ignores them. In C, both options are passed
further to `git diff`.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c |  87 ++++++++++++++++++++++++++
 git-stash.sh            | 132 +---------------------------------------
 2 files changed, 88 insertions(+), 131 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index d66a4589a5..36651f745a 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -10,9 +10,12 @@
 #include "run-command.h"
 #include "dir.h"
 #include "rerere.h"
+#include "revision.h"
+#include "log-tree.h"
 
 static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper list [<options>]"),
+	N_("git stash--helper show [<options>] [<stash>]"),
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
 	N_("git stash--helper branch <branchname> [<stash>]"),
@@ -25,6 +28,11 @@ static const char * const git_stash_helper_list_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_show_usage[] = {
+	N_("git stash--helper show [<options>] [<stash>]"),
+	NULL
+};
+
 static const char * const git_stash_helper_drop_usage[] = {
 	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
 	NULL
@@ -645,6 +653,83 @@ static int list_stash(int argc, const char **argv, const char *prefix)
 	return run_command(&cp);
 }
 
+static int show_stat = 1;
+static int show_patch;
+
+static int git_stash_config(const char *var, const char *value, void *cb)
+{
+	if (!strcmp(var, "stash.showstat")) {
+		show_stat = git_config_bool(var, value);
+		return 0;
+	}
+	if (!strcmp(var, "stash.showpatch")) {
+		show_patch = git_config_bool(var, value);
+		return 0;
+	}
+	return git_default_config(var, value, cb);
+}
+
+static int show_stash(int argc, const char **argv, const char *prefix)
+{
+	int i;
+	int opts = 0;
+	int ret = 0;
+	struct stash_info info;
+	struct rev_info rev;
+	struct argv_array stash_args = ARGV_ARRAY_INIT;
+	struct option options[] = {
+		OPT_END()
+	};
+
+	init_diff_ui_defaults();
+	git_config(git_diff_ui_config, NULL);
+	init_revisions(&rev, prefix);
+
+	for (i = 1; i < argc; i++) {
+		if (argv[i][0] != '-')
+			argv_array_push(&stash_args, argv[i]);
+		else
+			opts++;
+	}
+
+	ret = get_stash_info(&info, stash_args.argc, stash_args.argv);
+	argv_array_clear(&stash_args);
+	if (ret)
+		return -1;
+
+	/*
+	 * The config settings are applied only if there are not passed
+	 * any options.
+	 */
+	if (!opts) {
+		git_config(git_stash_config, NULL);
+		if (show_stat)
+			rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT;
+
+		if (show_patch)
+			rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
+
+		if (!show_stat && !show_patch) {
+			free_stash_info(&info);
+			return 0;
+		}
+	}
+
+	argc = setup_revisions(argc, argv, &rev, NULL);
+	if (argc > 1) {
+		free_stash_info(&info);
+		usage_with_options(git_stash_helper_show_usage, options);
+	}
+
+	rev.diffopt.flags.recursive = 1;
+	setup_diff_pager(&rev.diffopt);
+	diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
+	log_tree_diff_flush(&rev);
+
+	free_stash_info(&info);
+	return diff_result_code(&rev.diffopt, 0);
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -677,6 +762,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!branch_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "list"))
 		return !!list_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "show"))
+		return !!show_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 6052441aa2..0d05cbc1e5 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -378,35 +378,6 @@ save_stash () {
 	fi
 }
 
-have_stash () {
-	git rev-parse --verify --quiet $ref_stash >/dev/null
-}
-
-show_stash () {
-	ALLOW_UNKNOWN_FLAGS=t
-	assert_stash_like "$@"
-
-	if test -z "$FLAGS"
-	then
-		if test "$(git config --bool stash.showStat || echo true)" = "true"
-		then
-			FLAGS=--stat
-		fi
-
-		if test "$(git config --bool stash.showPatch || echo false)" = "true"
-		then
-			FLAGS=${FLAGS}${FLAGS:+ }-p
-		fi
-
-		if test -z "$FLAGS"
-		then
-			return 0
-		fi
-	fi
-
-	git diff ${FLAGS} $b_commit $w_commit
-}
-
 show_help () {
 	exec git help stash
 	exit 1
@@ -448,107 +419,6 @@ show_help () {
 #   * unknown flags were set and ALLOW_UNKNOWN_FLAGS is not "t"
 #
 
-parse_flags_and_rev()
-{
-	test "$PARSE_CACHE" = "$*" && return 0 # optimisation
-	PARSE_CACHE="$*"
-
-	IS_STASH_LIKE=
-	IS_STASH_REF=
-	INDEX_OPTION=
-	s=
-	w_commit=
-	b_commit=
-	i_commit=
-	u_commit=
-	w_tree=
-	b_tree=
-	i_tree=
-	u_tree=
-
-	FLAGS=
-	REV=
-	for opt
-	do
-		case "$opt" in
-			-q|--quiet)
-				GIT_QUIET=-t
-			;;
-			--index)
-				INDEX_OPTION=--index
-			;;
-			--help)
-				show_help
-			;;
-			-*)
-				test "$ALLOW_UNKNOWN_FLAGS" = t ||
-					die "$(eval_gettext "unknown option: \$opt")"
-				FLAGS="${FLAGS}${FLAGS:+ }$opt"
-			;;
-			*)
-				REV="${REV}${REV:+ }'$opt'"
-			;;
-		esac
-	done
-
-	eval set -- $REV
-
-	case $# in
-		0)
-			have_stash || die "$(gettext "No stash entries found.")"
-			set -- ${ref_stash}@{0}
-		;;
-		1)
-			:
-		;;
-		*)
-			die "$(eval_gettext "Too many revisions specified: \$REV")"
-		;;
-	esac
-
-	case "$1" in
-		*[!0-9]*)
-			:
-		;;
-		*)
-			set -- "${ref_stash}@{$1}"
-		;;
-	esac
-
-	REV=$(git rev-parse --symbolic --verify --quiet "$1") || {
-		reference="$1"
-		die "$(eval_gettext "\$reference is not a valid reference")"
-	}
-
-	i_commit=$(git rev-parse --verify --quiet "$REV^2") &&
-	set -- $(git rev-parse "$REV" "$REV^1" "$REV:" "$REV^1:" "$REV^2:" 2>/dev/null) &&
-	s=$1 &&
-	w_commit=$1 &&
-	b_commit=$2 &&
-	w_tree=$3 &&
-	b_tree=$4 &&
-	i_tree=$5 &&
-	IS_STASH_LIKE=t &&
-	test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
-	IS_STASH_REF=t
-
-	u_commit=$(git rev-parse --verify --quiet "$REV^3") &&
-	u_tree=$(git rev-parse "$REV^3:" 2>/dev/null)
-}
-
-is_stash_like()
-{
-	parse_flags_and_rev "$@"
-	test -n "$IS_STASH_LIKE"
-}
-
-assert_stash_like() {
-	is_stash_like "$@" || {
-		args="$*"
-		die "$(eval_gettext "'\$args' is not a stash-like commit")"
-	}
-}
-
 test "$1" = "-p" && set "push" "$@"
 
 PARSE_CACHE='--not-parsed'
@@ -573,7 +443,7 @@ list)
 	;;
 show)
 	shift
-	show_stash "$@"
+	git stash--helper show "$@"
 	;;
 save)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 15/22] stash: convert store to builtin

[Paul-Sebastian Ungureanu]

Add stash store to the helper and delete the store_stash function
from the shell script.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 62 +++++++++++++++++++++++++++++++++++++++++
 git-stash.sh            | 43 ++--------------------------
 2 files changed, 64 insertions(+), 41 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 36651f745a..5dc6c068d7 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -58,6 +58,11 @@ static const char * const git_stash_helper_clear_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_store_usage[] = {
+	N_("git stash--helper store [-m|--message <message>] [-q|--quiet] <commit>"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -730,6 +735,61 @@ static int show_stash(int argc, const char **argv, const char *prefix)
 	return diff_result_code(&rev.diffopt, 0);
 }
 
+static int do_store_stash(const struct object_id *w_commit, const char *stash_msg,
+			  int quiet)
+{
+	if (!stash_msg)
+		stash_msg = "Created via \"git stash store\".";
+
+	if (update_ref(stash_msg, ref_stash, w_commit, NULL,
+		       REF_FORCE_CREATE_REFLOG,
+		       quiet ? UPDATE_REFS_QUIET_ON_ERR :
+		       UPDATE_REFS_MSG_ON_ERR)) {
+		if (!quiet) {
+			fprintf_ln(stderr, _("Cannot update %s with %s"),
+				   ref_stash, oid_to_hex(w_commit));
+		}
+		return -1;
+	}
+
+	return 0;
+}
+
+static int store_stash(int argc, const char **argv, const char *prefix)
+{
+	int quiet = 0;
+	const char *stash_msg = NULL;
+	struct object_id obj;
+	struct object_context dummy;
+	struct option options[] = {
+		OPT__QUIET(&quiet, N_("be quiet")),
+		OPT_STRING('m', "message", &stash_msg, "message",
+			   N_("stash message")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_store_usage,
+			     PARSE_OPT_KEEP_UNKNOWN);
+
+	if (argc != 1) {
+		if (!quiet)
+			fprintf_ln(stderr, _("\"git stash store\" requires one "
+					     "<commit> argument"));
+		return -1;
+	}
+
+	if (get_oid_with_context(argv[0], quiet ? GET_OID_QUIETLY : 0, &obj,
+				 &dummy)) {
+		if (!quiet)
+			fprintf_ln(stderr, _("Cannot update %s with %s"),
+					     ref_stash, argv[0]);
+		return -1;
+	}
+
+	return do_store_stash(&obj, stash_msg, quiet);
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -764,6 +824,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!list_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "show"))
 		return !!show_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "store"))
+		return !!store_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 0d05cbc1e5..5739c51527 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -191,45 +191,6 @@ create_stash () {
 	die "$(gettext "Cannot record working tree state")"
 }
 
-store_stash () {
-	while test $# != 0
-	do
-		case "$1" in
-		-m|--message)
-			shift
-			stash_msg="$1"
-			;;
-		-m*)
-			stash_msg=${1#-m}
-			;;
-		--message=*)
-			stash_msg=${1#--message=}
-			;;
-		-q|--quiet)
-			quiet=t
-			;;
-		*)
-			break
-			;;
-		esac
-		shift
-	done
-	test $# = 1 ||
-	die "$(eval_gettext "\"$dashless store\" requires one <commit> argument")"
-
-	w_commit="$1"
-	if test -z "$stash_msg"
-	then
-		stash_msg="Created via \"git stash store\"."
-	fi
-
-	git update-ref --create-reflog -m "$stash_msg" $ref_stash $w_commit
-	ret=$?
-	test $ret != 0 && test -z "$quiet" &&
-	die "$(eval_gettext "Cannot update \$ref_stash with \$w_commit")"
-	return $ret
-}
-
 push_stash () {
 	keep_index=
 	patch_mode=
@@ -308,7 +269,7 @@ push_stash () {
 		clear_stash || die "$(gettext "Cannot initialize stash")"
 
 	create_stash -m "$stash_msg" -u "$untracked" -- "$@"
-	store_stash -m "$stash_msg" -q $w_commit ||
+	git stash--helper store -m "$stash_msg" -q $w_commit ||
 	die "$(gettext "Cannot save the current status")"
 	say "$(eval_gettext "Saved working directory and index state \$stash_msg")"
 
@@ -468,7 +429,7 @@ create)
 	;;
 store)
 	shift
-	store_stash "$@"
+	git stash--helper store "$@"
 	;;
 drop)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 16/22] stash: convert create to builtin

[Paul-Sebastian Ungureanu]

Add stash create to the helper.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 451 +++++++++++++++++++++++++++++++++++++++-
 git-stash.sh            |   2 +-
 2 files changed, 451 insertions(+), 2 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 5dc6c068d7..cd769d87b3 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -12,6 +12,9 @@
 #include "rerere.h"
 #include "revision.h"
 #include "log-tree.h"
+#include "diffcore.h"
+
+#define INCLUDE_ALL_FILES 2
 
 static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper list [<options>]"),
@@ -63,6 +66,11 @@ static const char * const git_stash_helper_store_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_create_usage[] = {
+	N_("git stash--helper create [<message>]"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -288,6 +296,24 @@ static int reset_head(void)
 	return run_command(&cp);
 }
 
+static void add_diff_to_buf(struct diff_queue_struct *q,
+			    struct diff_options *options,
+			    void *data)
+{
+	int i;
+
+	for (i = 0; i < q->nr; i++) {
+		strbuf_addstr(data, q->queue[i]->one->path);
+
+		/*
+		 * The reason we add "0" at the end of this strbuf
+		 * is because we will pass the output further to
+		 * "git update-index -z ...".
+		 */
+		strbuf_addch(data, '\0');
+	}
+}
+
 static int get_newly_staged(struct strbuf *out, struct object_id *c_tree)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
@@ -790,6 +816,427 @@ static int store_stash(int argc, const char **argv, const char *prefix)
 	return do_store_stash(&obj, stash_msg, quiet);
 }
 
+static void add_pathspecs(struct argv_array *args,
+			  struct pathspec ps) {
+	int i;
+
+	for (i = 0; i < ps.nr; i++)
+		argv_array_push(args, ps.items[i].match);
+}
+
+/*
+ * `untracked_files` will be filled with the names of untracked files.
+ * The return value is:
+ *
+ * = 0 if there are not any untracked files
+ * > 0 if there are untracked files
+ */
+static int get_untracked_files(struct pathspec ps, int include_untracked,
+			       struct strbuf *untracked_files)
+{
+	int i;
+	int max_len;
+	int found = 0;
+	char *seen;
+	struct dir_struct dir;
+
+	memset(&dir, 0, sizeof(dir));
+	if (include_untracked != INCLUDE_ALL_FILES)
+		setup_standard_excludes(&dir);
+
+	seen = xcalloc(ps.nr, 1);
+
+	max_len = fill_directory(&dir, the_repository->index, &ps);
+	for (i = 0; i < dir.nr; i++) {
+		struct dir_entry *ent = dir.entries[i];
+		if (dir_path_match(&the_index, ent, &ps, max_len, seen)) {
+			found++;
+			strbuf_addstr(untracked_files, ent->name);
+			/* NUL-terminate: will be fed to update-index -z */
+			strbuf_addch(untracked_files, 0);
+		}
+		free(ent);
+	}
+
+	free(seen);
+	free(dir.entries);
+	free(dir.ignored);
+	clear_directory(&dir);
+	return found;
+}
+
+/*
+ * The return value of `check_changes()` can be:
+ *
+ * < 0 if there was an error
+ * = 0 if there are no changes.
+ * > 0 if there are changes.
+ */
+static int check_changes(struct pathspec ps, int include_untracked)
+{
+	int result;
+	struct rev_info rev;
+	struct object_id dummy;
+	struct strbuf out = STRBUF_INIT;
+
+	/* No initial commit. */
+	if (get_oid("HEAD", &dummy))
+		return -1;
+
+	if (read_cache() < 0)
+		return -1;
+
+	init_revisions(&rev, NULL);
+	rev.prune_data = ps;
+
+	rev.diffopt.flags.quick = 1;
+	rev.diffopt.flags.ignore_submodules = 1;
+	rev.abbrev = 0;
+
+	add_head_to_pending(&rev);
+	diff_setup_done(&rev.diffopt);
+
+	result = run_diff_index(&rev, 1);
+	if (diff_result_code(&rev.diffopt, result))
+		return 1;
+
+	object_array_clear(&rev.pending);
+	result = run_diff_files(&rev, 0);
+	if (diff_result_code(&rev.diffopt, result))
+		return 1;
+
+	if (include_untracked && get_untracked_files(ps, include_untracked,
+						     &out)) {
+		strbuf_release(&out);
+		return 1;
+	}
+
+	strbuf_release(&out);
+	return 0;
+}
+
+static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
+				struct strbuf files)
+{
+	int ret = 0;
+	struct strbuf untracked_msg = STRBUF_INIT;
+	struct strbuf out = STRBUF_INIT;
+	struct child_process cp_upd_index = CHILD_PROCESS_INIT;
+	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+
+	cp_upd_index.git_cmd = 1;
+	argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
+			 "--remove", "--stdin", NULL);
+	argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+
+	strbuf_addf(&untracked_msg, "untracked files on %s\n", msg->buf);
+	if (pipe_command(&cp_upd_index, files.buf, files.len, NULL, 0,
+			 NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	cp_write_tree.git_cmd = 1;
+	argv_array_push(&cp_write_tree.args, "write-tree");
+	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+	get_oid_hex(out.buf, &info->u_tree);
+
+	if (commit_tree(untracked_msg.buf, untracked_msg.len,
+			&info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
+		ret = -1;
+		goto done;
+	}
+
+done:
+	strbuf_release(&untracked_msg);
+	strbuf_release(&out);
+	remove_path(stash_index_path.buf);
+	return ret;
+}
+
+static int stash_patch(struct stash_info *info, struct pathspec ps,
+		       struct strbuf *out_patch)
+{
+	int ret = 0;
+	struct strbuf out = STRBUF_INIT;
+	struct child_process cp_read_tree = CHILD_PROCESS_INIT;
+	struct child_process cp_add_i = CHILD_PROCESS_INIT;
+	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+	struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
+
+	remove_path(stash_index_path.buf);
+
+	cp_read_tree.git_cmd = 1;
+	argv_array_pushl(&cp_read_tree.args, "read-tree", "HEAD", NULL);
+	argv_array_pushf(&cp_read_tree.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (run_command(&cp_read_tree)) {
+		ret = -1;
+		goto done;
+	}
+
+	/* Find out what the user wants. */
+	cp_add_i.git_cmd = 1;
+	argv_array_pushl(&cp_add_i.args, "add--interactive", "--patch=stash",
+			 "--", NULL);
+	add_pathspecs(&cp_add_i.args, ps);
+	argv_array_pushf(&cp_add_i.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (run_command(&cp_add_i)) {
+		ret = -1;
+		goto done;
+	}
+
+	/* State of the working tree. */
+	cp_write_tree.git_cmd = 1;
+	argv_array_push(&cp_write_tree.args, "write-tree");
+	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	get_oid_hex(out.buf, &info->w_tree);
+
+	cp_diff_tree.git_cmd = 1;
+	argv_array_pushl(&cp_diff_tree.args, "diff-tree", "-p", "HEAD",
+			 oid_to_hex(&info->w_tree), "--", NULL);
+	if (pipe_command(&cp_diff_tree, NULL, 0, out_patch, 0, NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	if (!out_patch->len) {
+		fprintf_ln(stderr, _("No changes selected"));
+		ret = 1;
+	}
+
+done:
+	strbuf_release(&out);
+	remove_path(stash_index_path.buf);
+	return ret;
+}
+
+static int stash_working_tree(struct stash_info *info, struct pathspec ps)
+{
+	int ret = 0;
+	struct rev_info rev;
+	struct child_process cp_upd_index = CHILD_PROCESS_INIT;
+	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+	struct strbuf out = STRBUF_INIT;
+	struct strbuf diff_output = STRBUF_INIT;
+
+	set_alternate_index_output(stash_index_path.buf);
+	if (reset_tree(&info->i_tree, 0, 0)) {
+		ret = -1;
+		goto done;
+	}
+	set_alternate_index_output(NULL);
+
+	init_revisions(&rev, NULL);
+	rev.prune_data = ps;
+	rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+	rev.diffopt.format_callback = add_diff_to_buf;
+	rev.diffopt.format_callback_data = &diff_output;
+
+	if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
+		ret = -1;
+		goto done;
+	}
+
+	add_pending_object(&rev, parse_object(the_repository, &info->b_commit),
+			   "");
+	if (run_diff_index(&rev, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	cp_upd_index.git_cmd = 1;
+	argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
+			 "--remove", "--stdin", NULL);
+	argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+
+	if (pipe_command(&cp_upd_index, diff_output.buf, diff_output.len,
+			 NULL, 0, NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	cp_write_tree.git_cmd = 1;
+	argv_array_push(&cp_write_tree.args, "write-tree");
+	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+			 stash_index_path.buf);
+	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+		ret = -1;
+		goto done;
+	}
+
+	get_oid_hex(out.buf, &info->w_tree);
+
+done:
+	UNLEAK(rev);
+	strbuf_release(&out);
+	object_array_clear(&rev.pending);
+	strbuf_release(&diff_output);
+	remove_path(stash_index_path.buf);
+	return ret;
+}
+
+static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
+			   int include_untracked, int patch_mode,
+			   struct stash_info *info)
+{
+	int ret = 0;
+	int flags = 0;
+	int untracked_commit_option = 0;
+	const char *head_short_sha1 = NULL;
+	const char *branch_ref = NULL;
+	const char *branch_name = "(no branch)";
+	struct commit *head_commit = NULL;
+	struct commit_list *parents = NULL;
+	struct strbuf msg = STRBUF_INIT;
+	struct strbuf commit_tree_label = STRBUF_INIT;
+	struct strbuf untracked_files = STRBUF_INIT;
+	struct strbuf patch = STRBUF_INIT;
+
+	read_cache_preload(NULL);
+	refresh_cache(REFRESH_QUIET);
+
+	if (get_oid("HEAD", &info->b_commit)) {
+		fprintf_ln(stderr, _("You do not have the initial commit yet"));
+		ret = -1;
+		goto done;
+	} else {
+		head_commit = lookup_commit(the_repository, &info->b_commit);
+	}
+
+	if (!check_changes(ps, include_untracked)) {
+		ret = 1;
+		goto done;
+	}
+
+	branch_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
+	if (flags & REF_ISSYMREF)
+		branch_name = strrchr(branch_ref, '/') + 1;
+	head_short_sha1 = find_unique_abbrev(&head_commit->object.oid,
+					     DEFAULT_ABBREV);
+	strbuf_addf(&msg, "%s: %s ", branch_name, head_short_sha1);
+	pp_commit_easy(CMIT_FMT_ONELINE, head_commit, &msg);
+
+	strbuf_addf(&commit_tree_label, "index on %s\n", msg.buf);
+	commit_list_insert(head_commit, &parents);
+	if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
+	    commit_tree(commit_tree_label.buf, commit_tree_label.len,
+			&info->i_tree, parents, &info->i_commit, NULL, NULL)) {
+		fprintf_ln(stderr, _("Cannot save the current index state"));
+		ret = -1;
+		goto done;
+	}
+
+	if (include_untracked && get_untracked_files(ps, include_untracked,
+						     &untracked_files)) {
+		if (save_untracked_files(info, &msg, untracked_files)) {
+			fprintf_ln(stderr, _("Cannot save "
+					     "the untracked files"));
+			ret = -1;
+			goto done;
+		}
+		untracked_commit_option = 1;
+	}
+	if (patch_mode) {
+		ret = stash_patch(info, ps, &patch);
+		if (ret < 0) {
+			fprintf_ln(stderr, _("Cannot save the current "
+					     "worktree state"));
+			goto done;
+		} else if (ret > 0) {
+			goto done;
+		}
+	} else {
+		if (stash_working_tree(info, ps)) {
+			fprintf_ln(stderr, _("Cannot save the current "
+					     "worktree state"));
+			ret = -1;
+			goto done;
+		}
+	}
+
+	if (!stash_msg_buf->len)
+		strbuf_addf(stash_msg_buf, "WIP on %s", msg.buf);
+	else
+		strbuf_insertf(stash_msg_buf, 0, "On %s: ", branch_name);
+
+	/*
+	 * `parents` will be empty after calling `commit_tree()`, so there is
+	 * no need to call `free_commit_list()`
+	 */
+	parents = NULL;
+	if (untracked_commit_option)
+		commit_list_insert(lookup_commit(the_repository,
+						 &info->u_commit),
+				   &parents);
+	commit_list_insert(lookup_commit(the_repository, &info->i_commit),
+			   &parents);
+	commit_list_insert(head_commit, &parents);
+
+	if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
+			parents, &info->w_commit, NULL, NULL)) {
+		fprintf_ln(stderr, _("Cannot record working tree state"));
+		ret = -1;
+		goto done;
+	}
+
+done:
+	strbuf_release(&commit_tree_label);
+	strbuf_release(&msg);
+	strbuf_release(&untracked_files);
+	return ret;
+}
+
+static int create_stash(int argc, const char **argv, const char *prefix)
+{
+	int include_untracked = 0;
+	int ret = 0;
+	const char *stash_msg = NULL;
+	struct strbuf stash_msg_buf = STRBUF_INIT;
+	struct stash_info info;
+	struct pathspec ps;
+	struct option options[] = {
+		OPT_BOOL('u', "include-untracked", &include_untracked,
+			 N_("include untracked files in stash")),
+		OPT_STRING('m', "message", &stash_msg, N_("message"),
+			 N_("stash message")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_create_usage,
+			     0);
+
+	memset(&ps, 0, sizeof(ps));
+	strbuf_addstr(&stash_msg_buf, stash_msg);
+	ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info);
+
+	if (!ret)
+		printf_ln("%s", oid_to_hex(&info.w_commit));
+
+	strbuf_release(&stash_msg_buf);
+
+	/*
+	 * ret can be 1 if there were no changes. In this case, we should
+	 * not error out.
+	 */
+	return ret < 0;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -799,7 +1246,7 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
-	git_config(git_default_config, NULL);
+	git_config(git_diff_basic_config, NULL);
 
 	argc = parse_options(argc, argv, prefix, options, git_stash_helper_usage,
 			     PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
@@ -826,6 +1273,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!show_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "store"))
 		return !!store_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "create"))
+		return !!create_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index 5739c51527..ab06e4ffb8 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -425,7 +425,7 @@ clear)
 	;;
 create)
 	shift
-	create_stash -m "$*" && echo "$w_commit"
+	git stash--helper create --message "$*"
 	;;
 store)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 17/22] stash: convert push to builtin

[Paul-Sebastian Ungureanu]

Add stash push to the helper.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 245 +++++++++++++++++++++++++++++++++++++++-
 git-stash.sh            |   6 +-
 2 files changed, 245 insertions(+), 6 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index cd769d87b3..8683c662fc 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -23,6 +23,9 @@ static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
 	N_("git stash--helper branch <branchname> [<stash>]"),
 	N_("git stash--helper clear"),
+	N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
+	   "          [--] [<pathspec>...]]"),
 	NULL
 };
 
@@ -71,6 +74,13 @@ static const char * const git_stash_helper_create_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_push_usage[] = {
+	N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
+	   "          [--] [<pathspec>...]]"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -1092,7 +1102,7 @@ static int stash_working_tree(struct stash_info *info, struct pathspec ps)
 
 static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 			   int include_untracked, int patch_mode,
-			   struct stash_info *info)
+			   struct stash_info *info, struct strbuf *patch)
 {
 	int ret = 0;
 	int flags = 0;
@@ -1105,7 +1115,6 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 	struct strbuf msg = STRBUF_INIT;
 	struct strbuf commit_tree_label = STRBUF_INIT;
 	struct strbuf untracked_files = STRBUF_INIT;
-	struct strbuf patch = STRBUF_INIT;
 
 	read_cache_preload(NULL);
 	refresh_cache(REFRESH_QUIET);
@@ -1152,7 +1161,7 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 		untracked_commit_option = 1;
 	}
 	if (patch_mode) {
-		ret = stash_patch(info, ps, &patch);
+		ret = stash_patch(info, ps, patch);
 		if (ret < 0) {
 			fprintf_ln(stderr, _("Cannot save the current "
 					     "worktree state"));
@@ -1223,7 +1232,8 @@ static int create_stash(int argc, const char **argv, const char *prefix)
 
 	memset(&ps, 0, sizeof(ps));
 	strbuf_addstr(&stash_msg_buf, stash_msg);
-	ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info);
+	ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info,
+			      NULL);
 
 	if (!ret)
 		printf_ln("%s", oid_to_hex(&info.w_commit));
@@ -1237,6 +1247,231 @@ static int create_stash(int argc, const char **argv, const char *prefix)
 	return ret < 0;
 }
 
+static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
+			 int keep_index, int patch_mode, int include_untracked)
+{
+	int ret = 0;
+	struct stash_info info;
+	struct strbuf patch = STRBUF_INIT;
+	struct strbuf stash_msg_buf = STRBUF_INIT;
+
+	if (patch_mode && keep_index == -1)
+		keep_index = 1;
+
+	if (patch_mode && include_untracked) {
+		fprintf_ln(stderr, _("Can't use --patch and --include-untracked"
+				     " or --all at the same time"));
+		ret = -1;
+		goto done;
+	}
+
+	read_cache_preload(NULL);
+	if (!include_untracked && ps.nr) {
+		int i;
+		char *ps_matched = xcalloc(ps.nr, 1);
+
+		for (i = 0; i < active_nr; i++)
+			ce_path_match(&the_index, active_cache[i], &ps,
+				      ps_matched);
+
+		if (report_path_error(ps_matched, &ps, NULL)) {
+			fprintf_ln(stderr, _("Did you forget to 'git add'?"));
+			ret = -1;
+			free(ps_matched);
+			goto done;
+		}
+		free(ps_matched);
+	}
+
+	if (refresh_cache(REFRESH_QUIET)) {
+		ret = -1;
+		goto done;
+	}
+
+	if (!check_changes(ps, include_untracked)) {
+		if (!quiet)
+			printf_ln(_("No local changes to save"));
+		goto done;
+	}
+
+	if (!reflog_exists(ref_stash) && do_clear_stash()) {
+		ret = -1;
+		fprintf_ln(stderr, _("Cannot initialize stash"));
+		goto done;
+	}
+
+	if (stash_msg)
+		strbuf_addstr(&stash_msg_buf, stash_msg);
+	if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
+			    &info, &patch)) {
+		ret = -1;
+		goto done;
+	}
+
+	if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
+		ret = -1;
+		fprintf_ln(stderr, _("Cannot save the current status"));
+		goto done;
+	}
+
+	printf_ln(_("Saved working directory and index state %s"),
+		  stash_msg_buf.buf);
+
+	if (!patch_mode) {
+		if (include_untracked && !ps.nr) {
+			struct child_process cp = CHILD_PROCESS_INIT;
+
+			cp.git_cmd = 1;
+			argv_array_pushl(&cp.args, "clean", "--force",
+					 "--quiet", "-d", NULL);
+			if (include_untracked == INCLUDE_ALL_FILES)
+				argv_array_push(&cp.args, "-x");
+			if (run_command(&cp)) {
+				ret = -1;
+				goto done;
+			}
+		}
+		if (ps.nr) {
+			struct child_process cp_add = CHILD_PROCESS_INIT;
+			struct child_process cp_diff = CHILD_PROCESS_INIT;
+			struct child_process cp_apply = CHILD_PROCESS_INIT;
+			struct strbuf out = STRBUF_INIT;
+
+			cp_add.git_cmd = 1;
+			argv_array_push(&cp_add.args, "add");
+			if (!include_untracked)
+				argv_array_push(&cp_add.args, "-u");
+			if (include_untracked == INCLUDE_ALL_FILES)
+				argv_array_push(&cp_add.args, "--force");
+			argv_array_push(&cp_add.args, "--");
+			add_pathspecs(&cp_add.args, ps);
+			if (run_command(&cp_add)) {
+				ret = -1;
+				goto done;
+			}
+
+			cp_diff.git_cmd = 1;
+			argv_array_pushl(&cp_diff.args, "diff-index", "-p",
+					 "--cached", "--binary", "HEAD", "--",
+					 NULL);
+			add_pathspecs(&cp_diff.args, ps);
+			if (pipe_command(&cp_diff, NULL, 0, &out, 0, NULL, 0)) {
+				ret = -1;
+				goto done;
+			}
+
+			cp_apply.git_cmd = 1;
+			argv_array_pushl(&cp_apply.args, "apply", "--index",
+					 "-R", NULL);
+			if (pipe_command(&cp_apply, out.buf, out.len, NULL, 0,
+					 NULL, 0)) {
+				ret = -1;
+				goto done;
+			}
+		} else {
+			struct child_process cp = CHILD_PROCESS_INIT;
+			cp.git_cmd = 1;
+			argv_array_pushl(&cp.args, "reset", "--hard", "-q",
+					 NULL);
+			if (run_command(&cp)) {
+				ret = -1;
+				goto done;
+			}
+		}
+
+		if (keep_index == 1 && !is_null_oid(&info.i_tree)) {
+			struct child_process cp_ls = CHILD_PROCESS_INIT;
+			struct child_process cp_checkout = CHILD_PROCESS_INIT;
+			struct strbuf out = STRBUF_INIT;
+
+			if (reset_tree(&info.i_tree, 0, 1)) {
+				ret = -1;
+				goto done;
+			}
+
+			cp_ls.git_cmd = 1;
+			argv_array_pushl(&cp_ls.args, "ls-files", "-z",
+					 "--modified", "--", NULL);
+
+			add_pathspecs(&cp_ls.args, ps);
+			if (pipe_command(&cp_ls, NULL, 0, &out, 0, NULL, 0)) {
+				ret = -1;
+				goto done;
+			}
+
+			cp_checkout.git_cmd = 1;
+			argv_array_pushl(&cp_checkout.args, "checkout-index",
+					 "-z", "--force", "--stdin", NULL);
+			if (pipe_command(&cp_checkout, out.buf, out.len, NULL,
+					 0, NULL, 0)) {
+				ret = -1;
+				goto done;
+			}
+		}
+		goto done;
+	} else {
+		struct child_process cp = CHILD_PROCESS_INIT;
+
+		cp.git_cmd = 1;
+		argv_array_pushl(&cp.args, "apply", "-R", NULL);
+
+		if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
+			fprintf_ln(stderr, _("Cannot remove worktree changes"));
+			ret = -1;
+			goto done;
+		}
+
+		if (keep_index < 1) {
+			struct child_process cp = CHILD_PROCESS_INIT;
+
+			cp.git_cmd = 1;
+			argv_array_pushl(&cp.args, "reset", "-q", "--", NULL);
+			add_pathspecs(&cp.args, ps);
+			if (run_command(&cp)) {
+				ret = -1;
+				goto done;
+			}
+		}
+		goto done;
+	}
+
+done:
+	strbuf_release(&stash_msg_buf);
+	return ret;
+}
+
+static int push_stash(int argc, const char **argv, const char *prefix)
+{
+	int keep_index = -1;
+	int patch_mode = 0;
+	int include_untracked = 0;
+	int quiet = 0;
+	const char *stash_msg = NULL;
+	struct pathspec ps;
+	struct option options[] = {
+		OPT_BOOL('k', "keep-index", &keep_index,
+			 N_("keep index")),
+		OPT_BOOL('p', "patch", &patch_mode,
+			 N_("stash in patch mode")),
+		OPT__QUIET(&quiet, N_("quiet mode")),
+		OPT_BOOL('u', "include-untracked", &include_untracked,
+			 N_("include untracked files in stash")),
+		OPT_SET_INT('a', "all", &include_untracked,
+			    N_("include ignore files"), 2),
+		OPT_STRING('m', "message", &stash_msg, N_("message"),
+			   N_("stash message")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_push_usage,
+			     0);
+
+	parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL, prefix, argv);
+	return do_push_stash(ps, stash_msg, quiet, keep_index, patch_mode,
+			     include_untracked);
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -1275,6 +1510,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!store_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "create"))
 		return !!create_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "push"))
+		return !!push_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index ab06e4ffb8..c3146f62ab 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -412,7 +412,8 @@ save)
 	;;
 push)
 	shift
-	push_stash "$@"
+	cd "$START_DIR"
+	git stash--helper push "$@"
 	;;
 apply)
 	shift
@@ -448,7 +449,8 @@ branch)
 *)
 	case $# in
 	0)
-		push_stash &&
+		cd "$START_DIR"
+		git stash--helper push &&
 		say "$(gettext "(To restore them type \"git stash apply\")")"
 		;;
 	*)
-- 
2.19.1.878.g0482332a22

[PATCH v11 18/22] stash: make push -q quiet

[Paul-Sebastian Ungureanu]

There is a change in behaviour with this commit. When there was
no initial commit, the shell version of stash would still display
a message. This commit makes `push` to not display any message if
`--quiet` or `-q` is specified. Add tests for `--quiet`.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c | 56 ++++++++++++++++++++++++++---------------
 t/t3903-stash.sh        | 23 +++++++++++++++++
 2 files changed, 59 insertions(+), 20 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 8683c662fc..0dd5dbade6 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -971,7 +971,7 @@ static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 }
 
 static int stash_patch(struct stash_info *info, struct pathspec ps,
-		       struct strbuf *out_patch)
+		       struct strbuf *out_patch, int quiet)
 {
 	int ret = 0;
 	struct strbuf out = STRBUF_INIT;
@@ -1024,7 +1024,8 @@ static int stash_patch(struct stash_info *info, struct pathspec ps,
 	}
 
 	if (!out_patch->len) {
-		fprintf_ln(stderr, _("No changes selected"));
+		if (!quiet)
+			fprintf_ln(stderr, _("No changes selected"));
 		ret = 1;
 	}
 
@@ -1102,7 +1103,8 @@ static int stash_working_tree(struct stash_info *info, struct pathspec ps)
 
 static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 			   int include_untracked, int patch_mode,
-			   struct stash_info *info, struct strbuf *patch)
+			   struct stash_info *info, struct strbuf *patch,
+			   int quiet)
 {
 	int ret = 0;
 	int flags = 0;
@@ -1120,7 +1122,9 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 	refresh_cache(REFRESH_QUIET);
 
 	if (get_oid("HEAD", &info->b_commit)) {
-		fprintf_ln(stderr, _("You do not have the initial commit yet"));
+		if (!quiet)
+			fprintf_ln(stderr, _("You do not have "
+					     "the initial commit yet"));
 		ret = -1;
 		goto done;
 	} else {
@@ -1145,7 +1149,9 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 	if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
 	    commit_tree(commit_tree_label.buf, commit_tree_label.len,
 			&info->i_tree, parents, &info->i_commit, NULL, NULL)) {
-		fprintf_ln(stderr, _("Cannot save the current index state"));
+		if (!quiet)
+			fprintf_ln(stderr, _("Cannot save the current "
+					     "index state"));
 		ret = -1;
 		goto done;
 	}
@@ -1153,26 +1159,29 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 	if (include_untracked && get_untracked_files(ps, include_untracked,
 						     &untracked_files)) {
 		if (save_untracked_files(info, &msg, untracked_files)) {
-			fprintf_ln(stderr, _("Cannot save "
-					     "the untracked files"));
+			if (!quiet)
+				fprintf_ln(stderr, _("Cannot save "
+						     "the untracked files"));
 			ret = -1;
 			goto done;
 		}
 		untracked_commit_option = 1;
 	}
 	if (patch_mode) {
-		ret = stash_patch(info, ps, patch);
+		ret = stash_patch(info, ps, patch, quiet);
 		if (ret < 0) {
-			fprintf_ln(stderr, _("Cannot save the current "
-					     "worktree state"));
+			if (!quiet)
+				fprintf_ln(stderr, _("Cannot save the current "
+						     "worktree state"));
 			goto done;
 		} else if (ret > 0) {
 			goto done;
 		}
 	} else {
 		if (stash_working_tree(info, ps)) {
-			fprintf_ln(stderr, _("Cannot save the current "
-					     "worktree state"));
+			if (!quiet)
+				fprintf_ln(stderr, _("Cannot save the current "
+						     "worktree state"));
 			ret = -1;
 			goto done;
 		}
@@ -1198,7 +1207,9 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 
 	if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
 			parents, &info->w_commit, NULL, NULL)) {
-		fprintf_ln(stderr, _("Cannot record working tree state"));
+		if (!quiet)
+			fprintf_ln(stderr, _("Cannot record "
+					     "working tree state"));
 		ret = -1;
 		goto done;
 	}
@@ -1233,7 +1244,7 @@ static int create_stash(int argc, const char **argv, const char *prefix)
 	memset(&ps, 0, sizeof(ps));
 	strbuf_addstr(&stash_msg_buf, stash_msg);
 	ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info,
-			      NULL);
+			      NULL, 0);
 
 	if (!ret)
 		printf_ln("%s", oid_to_hex(&info.w_commit));
@@ -1296,26 +1307,29 @@ static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
 
 	if (!reflog_exists(ref_stash) && do_clear_stash()) {
 		ret = -1;
-		fprintf_ln(stderr, _("Cannot initialize stash"));
+		if (!quiet)
+			fprintf_ln(stderr, _("Cannot initialize stash"));
 		goto done;
 	}
 
 	if (stash_msg)
 		strbuf_addstr(&stash_msg_buf, stash_msg);
 	if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
-			    &info, &patch)) {
+			    &info, &patch, quiet)) {
 		ret = -1;
 		goto done;
 	}
 
 	if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
 		ret = -1;
-		fprintf_ln(stderr, _("Cannot save the current status"));
+		if (!quiet)
+			fprintf_ln(stderr, _("Cannot save the current status"));
 		goto done;
 	}
 
-	printf_ln(_("Saved working directory and index state %s"),
-		  stash_msg_buf.buf);
+	if (!quiet)
+		printf_ln(_("Saved working directory and index state %s"),
+			  stash_msg_buf.buf);
 
 	if (!patch_mode) {
 		if (include_untracked && !ps.nr) {
@@ -1416,7 +1430,9 @@ static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
 		argv_array_pushl(&cp.args, "apply", "-R", NULL);
 
 		if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
-			fprintf_ln(stderr, _("Cannot remove worktree changes"));
+			if (!quiet)
+				fprintf_ln(stderr, _("Cannot remove "
+						     "worktree changes"));
 			ret = -1;
 			goto done;
 		}
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 8b09a3d6cc..77e0b72035 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -1064,6 +1064,29 @@ test_expect_success 'push: <pathspec> not in the repository errors out' '
 	test_path_is_file untracked
 '
 
+test_expect_success 'push: -q is quiet with changes' '
+	>foo &&
+	git add foo &&
+	git stash push -q >output 2>&1 &&
+	test_must_be_empty output
+'
+
+test_expect_success 'push: -q is quiet with no changes' '
+	git stash push -q >output 2>&1 &&
+	test_must_be_empty output
+'
+
+test_expect_success 'push: -q is quiet even if there is no initial commit' '
+	git init foo_dir &&
+	test_when_finished rm -rf foo_dir &&
+	(
+		cd foo_dir &&
+		>bar &&
+		test_must_fail git stash push -q >output 2>&1 &&
+		test_must_be_empty output
+	)
+'
+
 test_expect_success 'untracked files are left in place when -u is not given' '
 	>file &&
 	git add file &&
-- 
2.19.1.878.g0482332a22

[PATCH v11 19/22] stash: convert save to builtin

[Paul-Sebastian Ungureanu]

Add stash save to the helper and delete functions which are no
longer needed (`show_help()`, `save_stash()`, `push_stash()`,
`create_stash()`, `clear_stash()`, `untracked_files()` and
`no_changes()`).

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash--helper.c |  50 +++++++
 git-stash.sh            | 311 +---------------------------------------
 2 files changed, 52 insertions(+), 309 deletions(-)

diff --git a/builtin/stash--helper.c b/builtin/stash--helper.c
index 0dd5dbade6..47a0ab6669 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash--helper.c
@@ -26,6 +26,8 @@ static const char * const git_stash_helper_usage[] = {
 	N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
 	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
 	   "          [--] [<pathspec>...]]"),
+	N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+	   "          [-u|--include-untracked] [-a|--all] [<message>]"),
 	NULL
 };
 
@@ -81,6 +83,12 @@ static const char * const git_stash_helper_push_usage[] = {
 	NULL
 };
 
+static const char * const git_stash_helper_save_usage[] = {
+	N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+	   "          [-u|--include-untracked] [-a|--all] [<message>]"),
+	NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -1488,6 +1496,46 @@ static int push_stash(int argc, const char **argv, const char *prefix)
 			     include_untracked);
 }
 
+static int save_stash(int argc, const char **argv, const char *prefix)
+{
+	int keep_index = -1;
+	int patch_mode = 0;
+	int include_untracked = 0;
+	int quiet = 0;
+	int ret = 0;
+	const char *stash_msg = NULL;
+	struct pathspec ps;
+	struct strbuf stash_msg_buf = STRBUF_INIT;
+	struct option options[] = {
+		OPT_BOOL('k', "keep-index", &keep_index,
+			 N_("keep index")),
+		OPT_BOOL('p', "patch", &patch_mode,
+			 N_("stash in patch mode")),
+		OPT__QUIET(&quiet, N_("quiet mode")),
+		OPT_BOOL('u', "include-untracked", &include_untracked,
+			 N_("include untracked files in stash")),
+		OPT_SET_INT('a', "all", &include_untracked,
+			    N_("include ignore files"), 2),
+		OPT_STRING('m', "message", &stash_msg, "message",
+			   N_("stash message")),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, prefix, options,
+			     git_stash_helper_save_usage,
+			     PARSE_OPT_KEEP_DASHDASH);
+
+	if (argc)
+		stash_msg = strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
+
+	memset(&ps, 0, sizeof(ps));
+	ret = do_push_stash(ps, stash_msg, quiet, keep_index,
+			    patch_mode, include_untracked);
+
+	strbuf_release(&stash_msg_buf);
+	return ret;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
 	pid_t pid = getpid();
@@ -1528,6 +1576,8 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!create_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "push"))
 		return !!push_stash(argc, argv, prefix);
+	else if (!strcmp(argv[0], "save"))
+		return !!save_stash(argc, argv, prefix);
 
 	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
 		      git_stash_helper_usage, options);
diff --git a/git-stash.sh b/git-stash.sh
index c3146f62ab..695f1feba3 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -36,314 +36,6 @@ else
        reset_color=
 fi
 
-no_changes () {
-	git diff-index --quiet --cached HEAD --ignore-submodules -- "$@" &&
-	git diff-files --quiet --ignore-submodules -- "$@" &&
-	(test -z "$untracked" || test -z "$(untracked_files "$@")")
-}
-
-untracked_files () {
-	if test "$1" = "-z"
-	then
-		shift
-		z=-z
-	else
-		z=
-	fi
-	excl_opt=--exclude-standard
-	test "$untracked" = "all" && excl_opt=
-	git ls-files -o $z $excl_opt -- "$@"
-}
-
-clear_stash () {
-	if test $# != 0
-	then
-		die "$(gettext "git stash clear with parameters is unimplemented")"
-	fi
-	if current=$(git rev-parse --verify --quiet $ref_stash)
-	then
-		git update-ref -d $ref_stash $current
-	fi
-}
-
-create_stash () {
-	stash_msg=
-	untracked=
-	while test $# != 0
-	do
-		case "$1" in
-		-m|--message)
-			shift
-			stash_msg=${1?"BUG: create_stash () -m requires an argument"}
-			;;
-		-m*)
-			stash_msg=${1#-m}
-			;;
-		--message=*)
-			stash_msg=${1#--message=}
-			;;
-		-u|--include-untracked)
-			shift
-			untracked=${1?"BUG: create_stash () -u requires an argument"}
-			;;
-		--)
-			shift
-			break
-			;;
-		esac
-		shift
-	done
-
-	git update-index -q --refresh
-	if no_changes "$@"
-	then
-		exit 0
-	fi
-
-	# state of the base commit
-	if b_commit=$(git rev-parse --verify HEAD)
-	then
-		head=$(git rev-list --oneline -n 1 HEAD --)
-	else
-		die "$(gettext "You do not have the initial commit yet")"
-	fi
-
-	if branch=$(git symbolic-ref -q HEAD)
-	then
-		branch=${branch#refs/heads/}
-	else
-		branch='(no branch)'
-	fi
-	msg=$(printf '%s: %s' "$branch" "$head")
-
-	# state of the index
-	i_tree=$(git write-tree) &&
-	i_commit=$(printf 'index on %s\n' "$msg" |
-		git commit-tree $i_tree -p $b_commit) ||
-		die "$(gettext "Cannot save the current index state")"
-
-	if test -n "$untracked"
-	then
-		# Untracked files are stored by themselves in a parentless commit, for
-		# ease of unpacking later.
-		u_commit=$(
-			untracked_files -z "$@" | (
-				GIT_INDEX_FILE="$TMPindex" &&
-				export GIT_INDEX_FILE &&
-				rm -f "$TMPindex" &&
-				git update-index -z --add --remove --stdin &&
-				u_tree=$(git write-tree) &&
-				printf 'untracked files on %s\n' "$msg" | git commit-tree $u_tree  &&
-				rm -f "$TMPindex"
-		) ) || die "$(gettext "Cannot save the untracked files")"
-
-		untracked_commit_option="-p $u_commit";
-	else
-		untracked_commit_option=
-	fi
-
-	if test -z "$patch_mode"
-	then
-
-		# state of the working tree
-		w_tree=$( (
-			git read-tree --index-output="$TMPindex" -m $i_tree &&
-			GIT_INDEX_FILE="$TMPindex" &&
-			export GIT_INDEX_FILE &&
-			git diff-index --name-only -z HEAD -- "$@" >"$TMP-stagenames" &&
-			git update-index -z --add --remove --stdin <"$TMP-stagenames" &&
-			git write-tree &&
-			rm -f "$TMPindex"
-		) ) ||
-			die "$(gettext "Cannot save the current worktree state")"
-
-	else
-
-		rm -f "$TMP-index" &&
-		GIT_INDEX_FILE="$TMP-index" git read-tree HEAD &&
-
-		# find out what the user wants
-		GIT_INDEX_FILE="$TMP-index" \
-			git add--interactive --patch=stash -- "$@" &&
-
-		# state of the working tree
-		w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
-		die "$(gettext "Cannot save the current worktree state")"
-
-		git diff-tree -p HEAD $w_tree -- >"$TMP-patch" &&
-		test -s "$TMP-patch" ||
-		die "$(gettext "No changes selected")"
-
-		rm -f "$TMP-index" ||
-		die "$(gettext "Cannot remove temporary index (can't happen)")"
-
-	fi
-
-	# create the stash
-	if test -z "$stash_msg"
-	then
-		stash_msg=$(printf 'WIP on %s' "$msg")
-	else
-		stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
-	fi
-	w_commit=$(printf '%s\n' "$stash_msg" |
-	git commit-tree $w_tree -p $b_commit -p $i_commit $untracked_commit_option) ||
-	die "$(gettext "Cannot record working tree state")"
-}
-
-push_stash () {
-	keep_index=
-	patch_mode=
-	untracked=
-	stash_msg=
-	while test $# != 0
-	do
-		case "$1" in
-		-k|--keep-index)
-			keep_index=t
-			;;
-		--no-keep-index)
-			keep_index=n
-			;;
-		-p|--patch)
-			patch_mode=t
-			# only default to keep if we don't already have an override
-			test -z "$keep_index" && keep_index=t
-			;;
-		-q|--quiet)
-			GIT_QUIET=t
-			;;
-		-u|--include-untracked)
-			untracked=untracked
-			;;
-		-a|--all)
-			untracked=all
-			;;
-		-m|--message)
-			shift
-			test -z ${1+x} && usage
-			stash_msg=$1
-			;;
-		-m*)
-			stash_msg=${1#-m}
-			;;
-		--message=*)
-			stash_msg=${1#--message=}
-			;;
-		--help)
-			show_help
-			;;
-		--)
-			shift
-			break
-			;;
-		-*)
-			option="$1"
-			eval_gettextln "error: unknown option for 'stash push': \$option"
-			usage
-			;;
-		*)
-			break
-			;;
-		esac
-		shift
-	done
-
-	eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
-
-	if test -n "$patch_mode" && test -n "$untracked"
-	then
-		die "$(gettext "Can't use --patch and --include-untracked or --all at the same time")"
-	fi
-
-	test -n "$untracked" || git ls-files --error-unmatch -- "$@" >/dev/null || exit 1
-
-	git update-index -q --refresh
-	if no_changes "$@"
-	then
-		say "$(gettext "No local changes to save")"
-		exit 0
-	fi
-
-	git reflog exists $ref_stash ||
-		clear_stash || die "$(gettext "Cannot initialize stash")"
-
-	create_stash -m "$stash_msg" -u "$untracked" -- "$@"
-	git stash--helper store -m "$stash_msg" -q $w_commit ||
-	die "$(gettext "Cannot save the current status")"
-	say "$(eval_gettext "Saved working directory and index state \$stash_msg")"
-
-	if test -z "$patch_mode"
-	then
-		test "$untracked" = "all" && CLEAN_X_OPTION=-x || CLEAN_X_OPTION=
-		if test -n "$untracked" && test $# = 0
-		then
-			git clean --force --quiet -d $CLEAN_X_OPTION
-		fi
-
-		if test $# != 0
-		then
-			test -z "$untracked" && UPDATE_OPTION="-u" || UPDATE_OPTION=
-			test "$untracked" = "all" && FORCE_OPTION="--force" || FORCE_OPTION=
-			git add $UPDATE_OPTION $FORCE_OPTION -- "$@"
-			git diff-index -p --cached --binary HEAD -- "$@" |
-			git apply --index -R
-		else
-			git reset --hard -q
-		fi
-
-		if test "$keep_index" = "t" && test -n "$i_tree"
-		then
-			git read-tree --reset $i_tree
-			git ls-files -z --modified -- "$@" |
-			git checkout-index -z --force --stdin
-		fi
-	else
-		git apply -R < "$TMP-patch" ||
-		die "$(gettext "Cannot remove worktree changes")"
-
-		if test "$keep_index" != "t"
-		then
-			git reset -q -- "$@"
-		fi
-	fi
-}
-
-save_stash () {
-	push_options=
-	while test $# != 0
-	do
-		case "$1" in
-		--)
-			shift
-			break
-			;;
-		-*)
-			# pass all options through to push_stash
-			push_options="$push_options $1"
-			;;
-		*)
-			break
-			;;
-		esac
-		shift
-	done
-
-	stash_msg="$*"
-
-	if test -z "$stash_msg"
-	then
-		push_stash $push_options
-	else
-		push_stash $push_options -m "$stash_msg"
-	fi
-}
-
-show_help () {
-	exec git help stash
-	exit 1
-}
-
 #
 # Parses the remaining options looking for flags and
 # at most one revision defaulting to ${ref_stash}@{0}
@@ -408,7 +100,8 @@ show)
 	;;
 save)
 	shift
-	save_stash "$@"
+	cd "$START_DIR"
+	git stash--helper save "$@"
 	;;
 push)
 	shift
-- 
2.19.1.878.g0482332a22

[PATCH v11 20/22] stash: convert `stash--helper.c` into `stash.c`

[Paul-Sebastian Ungureanu]

The old shell script `git-stash.sh`  was removed and replaced
entirely by `builtin/stash.c`. In order to do that, `create` and
`push` were adapted to work without `stash.sh`. For example, before
this commit, `git stash create` called `git stash--helper create
--message "$*"`. If it called `git stash--helper create "$@"`, then
some of these changes wouldn't have been necessary.

This commit also removes the word `helper` since now stash is
called directly and not by a shell script.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 .gitignore                           |   1 -
 Makefile                             |   3 +-
 builtin.h                            |   2 +-
 builtin/{stash--helper.c => stash.c} | 157 +++++++++++++++------------
 git-stash.sh                         | 153 --------------------------
 git.c                                |   2 +-
 6 files changed, 92 insertions(+), 226 deletions(-)
 rename builtin/{stash--helper.c => stash.c} (91%)
 delete mode 100755 git-stash.sh

diff --git a/.gitignore b/.gitignore
index 6ecab90ab2..0d77ea5894 100644
--- a/.gitignore
+++ b/.gitignore
@@ -162,7 +162,6 @@
 /git-show-ref
 /git-stage
 /git-stash
-/git-stash--helper
 /git-status
 /git-stripspace
 /git-submodule
diff --git a/Makefile b/Makefile
index aa83545e94..450936fcaf 100644
--- a/Makefile
+++ b/Makefile
@@ -619,7 +619,6 @@ SCRIPT_SH += git-quiltimport.sh
 SCRIPT_SH += git-legacy-rebase.sh
 SCRIPT_SH += git-remote-testgit.sh
 SCRIPT_SH += git-request-pull.sh
-SCRIPT_SH += git-stash.sh
 SCRIPT_SH += git-submodule.sh
 SCRIPT_SH += git-web--browse.sh
 
@@ -1115,7 +1114,7 @@ BUILTIN_OBJS += builtin/shortlog.o
 BUILTIN_OBJS += builtin/show-branch.o
 BUILTIN_OBJS += builtin/show-index.o
 BUILTIN_OBJS += builtin/show-ref.o
-BUILTIN_OBJS += builtin/stash--helper.o
+BUILTIN_OBJS += builtin/stash.o
 BUILTIN_OBJS += builtin/stripspace.o
 BUILTIN_OBJS += builtin/submodule--helper.o
 BUILTIN_OBJS += builtin/symbolic-ref.o
diff --git a/builtin.h b/builtin.h
index ff4460aff7..b78ab6e30b 100644
--- a/builtin.h
+++ b/builtin.h
@@ -225,7 +225,7 @@ extern int cmd_show(int argc, const char **argv, const char *prefix);
 extern int cmd_show_branch(int argc, const char **argv, const char *prefix);
 extern int cmd_show_index(int argc, const char **argv, const char *prefix);
 extern int cmd_status(int argc, const char **argv, const char *prefix);
-extern int cmd_stash__helper(int argc, const char **argv, const char *prefix);
+extern int cmd_stash(int argc, const char **argv, const char *prefix);
 extern int cmd_stripspace(int argc, const char **argv, const char *prefix);
 extern int cmd_submodule__helper(int argc, const char **argv, const char *prefix);
 extern int cmd_symbolic_ref(int argc, const char **argv, const char *prefix);
diff --git a/builtin/stash--helper.c b/builtin/stash.c
similarity index 91%
rename from builtin/stash--helper.c
rename to builtin/stash.c
index 47a0ab6669..c76a1936d5 100644
--- a/builtin/stash--helper.c
+++ b/builtin/stash.c
@@ -16,75 +16,70 @@
 
 #define INCLUDE_ALL_FILES 2
 
-static const char * const git_stash_helper_usage[] = {
-	N_("git stash--helper list [<options>]"),
-	N_("git stash--helper show [<options>] [<stash>]"),
-	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
-	N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
-	N_("git stash--helper branch <branchname> [<stash>]"),
-	N_("git stash--helper clear"),
-	N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+static const char * const git_stash_usage[] = {
+	N_("git stash list [<options>]"),
+	N_("git stash show [<options>] [<stash>]"),
+	N_("git stash drop [-q|--quiet] [<stash>]"),
+	N_("git stash ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
+	N_("git stash branch <branchname> [<stash>]"),
+	N_("git stash clear"),
+	N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
 	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
 	   "          [--] [<pathspec>...]]"),
-	N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+	N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
 	   "          [-u|--include-untracked] [-a|--all] [<message>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_list_usage[] = {
-	N_("git stash--helper list [<options>]"),
+static const char * const git_stash_list_usage[] = {
+	N_("git stash list [<options>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_show_usage[] = {
-	N_("git stash--helper show [<options>] [<stash>]"),
+static const char * const git_stash_show_usage[] = {
+	N_("git stash show [<options>] [<stash>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_drop_usage[] = {
-	N_("git stash--helper drop [-q|--quiet] [<stash>]"),
+static const char * const git_stash_drop_usage[] = {
+	N_("git stash drop [-q|--quiet] [<stash>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_pop_usage[] = {
-	N_("git stash--helper pop [--index] [-q|--quiet] [<stash>]"),
+static const char * const git_stash_pop_usage[] = {
+	N_("git stash pop [--index] [-q|--quiet] [<stash>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_apply_usage[] = {
-	N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+static const char * const git_stash_apply_usage[] = {
+	N_("git stash apply [--index] [-q|--quiet] [<stash>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_branch_usage[] = {
-	N_("git stash--helper branch <branchname> [<stash>]"),
+static const char * const git_stash_branch_usage[] = {
+	N_("git stash branch <branchname> [<stash>]"),
 	NULL
 };
 
-static const char * const git_stash_helper_clear_usage[] = {
-	N_("git stash--helper clear"),
+static const char * const git_stash_clear_usage[] = {
+	N_("git stash clear"),
 	NULL
 };
 
-static const char * const git_stash_helper_store_usage[] = {
-	N_("git stash--helper store [-m|--message <message>] [-q|--quiet] <commit>"),
+static const char * const git_stash_store_usage[] = {
+	N_("git stash store [-m|--message <message>] [-q|--quiet] <commit>"),
 	NULL
 };
 
-static const char * const git_stash_helper_create_usage[] = {
-	N_("git stash--helper create [<message>]"),
-	NULL
-};
-
-static const char * const git_stash_helper_push_usage[] = {
-	N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+static const char * const git_stash_push_usage[] = {
+	N_("git stash [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
 	   "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
 	   "          [--] [<pathspec>...]]"),
 	NULL
 };
 
-static const char * const git_stash_helper_save_usage[] = {
-	N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+static const char * const git_stash_save_usage[] = {
+	N_("git stash save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
 	   "          [-u|--include-untracked] [-a|--all] [<message>]"),
 	NULL
 };
@@ -221,7 +216,7 @@ static int clear_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_clear_usage,
+			     git_stash_clear_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
 
 	if (argc)
@@ -526,7 +521,7 @@ static int apply_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_apply_usage, 0);
+			     git_stash_apply_usage, 0);
 
 	if (get_stash_info(&info, argc, argv))
 		return -1;
@@ -599,7 +594,7 @@ static int drop_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_drop_usage, 0);
+			     git_stash_drop_usage, 0);
 
 	if (get_stash_info(&info, argc, argv))
 		return -1;
@@ -625,7 +620,7 @@ static int pop_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_pop_usage, 0);
+			     git_stash_pop_usage, 0);
 
 	if (get_stash_info(&info, argc, argv))
 		return -1;
@@ -652,7 +647,7 @@ static int branch_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_branch_usage, 0);
+			     git_stash_branch_usage, 0);
 
 	if (!argc) {
 		fprintf_ln(stderr, _("No branch name specified"));
@@ -687,7 +682,7 @@ static int list_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_list_usage,
+			     git_stash_list_usage,
 			     PARSE_OPT_KEEP_UNKNOWN);
 
 	if (!ref_exists(ref_stash))
@@ -767,7 +762,7 @@ static int show_stash(int argc, const char **argv, const char *prefix)
 	argc = setup_revisions(argc, argv, &rev, NULL);
 	if (argc > 1) {
 		free_stash_info(&info);
-		usage_with_options(git_stash_helper_show_usage, options);
+		usage_with_options(git_stash_show_usage, options);
 	}
 
 	rev.diffopt.flags.recursive = 1;
@@ -813,7 +808,7 @@ static int store_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_store_usage,
+			     git_stash_store_usage,
 			     PARSE_OPT_KEEP_UNKNOWN);
 
 	if (argc != 1) {
@@ -1231,28 +1226,16 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 
 static int create_stash(int argc, const char **argv, const char *prefix)
 {
-	int include_untracked = 0;
 	int ret = 0;
-	const char *stash_msg = NULL;
 	struct strbuf stash_msg_buf = STRBUF_INIT;
 	struct stash_info info;
 	struct pathspec ps;
-	struct option options[] = {
-		OPT_BOOL('u', "include-untracked", &include_untracked,
-			 N_("include untracked files in stash")),
-		OPT_STRING('m', "message", &stash_msg, N_("message"),
-			 N_("stash message")),
-		OPT_END()
-	};
 
-	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_create_usage,
-			     0);
+	/* Starting with argv[1], since argv[0] is "create" */
+	strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
 
 	memset(&ps, 0, sizeof(ps));
-	strbuf_addstr(&stash_msg_buf, stash_msg);
-	ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info,
-			      NULL, 0);
+	ret = do_create_stash(ps, &stash_msg_buf, 0, 0, &info, NULL, 0);
 
 	if (!ret)
 		printf_ln("%s", oid_to_hex(&info.w_commit));
@@ -1487,9 +1470,10 @@ static int push_stash(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
-	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_push_usage,
-			     0);
+	if (argc)
+		argc = parse_options(argc, argv, prefix, options,
+				     git_stash_push_usage,
+				     0);
 
 	parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL, prefix, argv);
 	return do_push_stash(ps, stash_msg, quiet, keep_index, patch_mode,
@@ -1522,7 +1506,7 @@ static int save_stash(int argc, const char **argv, const char *prefix)
 	};
 
 	argc = parse_options(argc, argv, prefix, options,
-			     git_stash_helper_save_usage,
+			     git_stash_save_usage,
 			     PARSE_OPT_KEEP_DASHDASH);
 
 	if (argc)
@@ -1536,10 +1520,12 @@ static int save_stash(int argc, const char **argv, const char *prefix)
 	return ret;
 }
 
-int cmd_stash__helper(int argc, const char **argv, const char *prefix)
+int cmd_stash(int argc, const char **argv, const char *prefix)
 {
+	int i = -1;
 	pid_t pid = getpid();
 	const char *index_file;
+	struct argv_array args = ARGV_ARRAY_INIT;
 
 	struct option options[] = {
 		OPT_END()
@@ -1547,16 +1533,16 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 
 	git_config(git_diff_basic_config, NULL);
 
-	argc = parse_options(argc, argv, prefix, options, git_stash_helper_usage,
+	argc = parse_options(argc, argv, prefix, options, git_stash_usage,
 			     PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
 
 	index_file = get_index_file();
 	strbuf_addf(&stash_index_path, "%s.stash.%" PRIuMAX, index_file,
 		    (uintmax_t)pid);
 
-	if (argc < 1)
-		usage_with_options(git_stash_helper_usage, options);
-	if (!strcmp(argv[0], "apply"))
+	if (!argc)
+		return !!push_stash(0, NULL, prefix);
+	else if (!strcmp(argv[0], "apply"))
 		return !!apply_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "clear"))
 		return !!clear_stash(argc, argv, prefix);
@@ -1578,7 +1564,42 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 		return !!push_stash(argc, argv, prefix);
 	else if (!strcmp(argv[0], "save"))
 		return !!save_stash(argc, argv, prefix);
+	else if (*argv[0] != '-')
+		usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
+			      git_stash_usage, options);
+
+	if (strcmp(argv[0], "-p")) {
+		while (++i < argc && strcmp(argv[i], "--")) {
+			/*
+			 * `akpqu` is a string which contains all short options,
+			 * except `-m` which is verified separately.
+			 */
+			if ((strlen(argv[i]) == 2) && *argv[i] == '-' &&
+			    strchr("akpqu", argv[i][1]))
+				continue;
+
+			if (!strcmp(argv[i], "--all") ||
+			    !strcmp(argv[i], "--keep-index") ||
+			    !strcmp(argv[i], "--no-keep-index") ||
+			    !strcmp(argv[i], "--patch") ||
+			    !strcmp(argv[i], "--quiet") ||
+			    !strcmp(argv[i], "--include-untracked"))
+				continue;
+
+			/*
+			 * `-m` and `--message=` are verified separately because
+			 * they need to be immediately followed by a string
+			 * (i.e.`-m"foobar"` or `--message="foobar"`).
+			 */
+			if (starts_with(argv[i], "-m") ||
+			    starts_with(argv[i], "--message="))
+				continue;
+
+			usage_with_options(git_stash_usage, options);
+		}
+	}
 
-	usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
-		      git_stash_helper_usage, options);
+	argv_array_push(&args, "push");
+	argv_array_pushv(&args, argv);
+	return !!push_stash(args.argc, args.argv, prefix);
 }
diff --git a/git-stash.sh b/git-stash.sh
deleted file mode 100755
index 695f1feba3..0000000000
--- a/git-stash.sh
+++ /dev/null
@@ -1,153 +0,0 @@
-#!/bin/sh
-# Copyright (c) 2007, Nanako Shiraishi
-
-dashless=$(basename "$0" | sed -e 's/-/ /')
-USAGE="list [<options>]
-   or: $dashless show [<stash>]
-   or: $dashless drop [-q|--quiet] [<stash>]
-   or: $dashless ( pop | apply ) [--index] [-q|--quiet] [<stash>]
-   or: $dashless branch <branchname> [<stash>]
-   or: $dashless save [--patch] [-k|--[no-]keep-index] [-q|--quiet]
-		      [-u|--include-untracked] [-a|--all] [<message>]
-   or: $dashless [push [--patch] [-k|--[no-]keep-index] [-q|--quiet]
-		       [-u|--include-untracked] [-a|--all] [-m <message>]
-		       [-- <pathspec>...]]
-   or: $dashless clear"
-
-SUBDIRECTORY_OK=Yes
-OPTIONS_SPEC=
-START_DIR=$(pwd)
-. git-sh-setup
-require_work_tree
-prefix=$(git rev-parse --show-prefix) || exit 1
-cd_to_toplevel
-
-TMP="$GIT_DIR/.git-stash.$$"
-TMPindex=${GIT_INDEX_FILE-"$(git rev-parse --git-path index)"}.stash.$$
-trap 'rm -f "$TMP-"* "$TMPindex"' 0
-
-ref_stash=refs/stash
-
-if git config --get-colorbool color.interactive; then
-       help_color="$(git config --get-color color.interactive.help 'red bold')"
-       reset_color="$(git config --get-color '' reset)"
-else
-       help_color=
-       reset_color=
-fi
-
-#
-# Parses the remaining options looking for flags and
-# at most one revision defaulting to ${ref_stash}@{0}
-# if none found.
-#
-# Derives related tree and commit objects from the
-# revision, if one is found.
-#
-# stash records the work tree, and is a merge between the
-# base commit (first parent) and the index tree (second parent).
-#
-#   REV is set to the symbolic version of the specified stash-like commit
-#   IS_STASH_LIKE is non-blank if ${REV} looks like a stash
-#   IS_STASH_REF is non-blank if the ${REV} looks like a stash ref
-#   s is set to the SHA1 of the stash commit
-#   w_commit is set to the commit containing the working tree
-#   b_commit is set to the base commit
-#   i_commit is set to the commit containing the index tree
-#   u_commit is set to the commit containing the untracked files tree
-#   w_tree is set to the working tree
-#   b_tree is set to the base tree
-#   i_tree is set to the index tree
-#   u_tree is set to the untracked files tree
-#
-#   GIT_QUIET is set to t if -q is specified
-#   INDEX_OPTION is set to --index if --index is specified.
-#   FLAGS is set to the remaining flags (if allowed)
-#
-# dies if:
-#   * too many revisions specified
-#   * no revision is specified and there is no stash stack
-#   * a revision is specified which cannot be resolve to a SHA1
-#   * a non-existent stash reference is specified
-#   * unknown flags were set and ALLOW_UNKNOWN_FLAGS is not "t"
-#
-
-test "$1" = "-p" && set "push" "$@"
-
-PARSE_CACHE='--not-parsed'
-# The default command is "push" if nothing but options are given
-seen_non_option=
-for opt
-do
-	case "$opt" in
-	--) break ;;
-	-*) ;;
-	*) seen_non_option=t; break ;;
-	esac
-done
-
-test -n "$seen_non_option" || set "push" "$@"
-
-# Main command set
-case "$1" in
-list)
-	shift
-	git stash--helper list "$@"
-	;;
-show)
-	shift
-	git stash--helper show "$@"
-	;;
-save)
-	shift
-	cd "$START_DIR"
-	git stash--helper save "$@"
-	;;
-push)
-	shift
-	cd "$START_DIR"
-	git stash--helper push "$@"
-	;;
-apply)
-	shift
-	cd "$START_DIR"
-	git stash--helper apply "$@"
-	;;
-clear)
-	shift
-	git stash--helper clear "$@"
-	;;
-create)
-	shift
-	git stash--helper create --message "$*"
-	;;
-store)
-	shift
-	git stash--helper store "$@"
-	;;
-drop)
-	shift
-	git stash--helper drop "$@"
-	;;
-pop)
-	shift
-	cd "$START_DIR"
-	git stash--helper pop "$@"
-	;;
-branch)
-	shift
-	cd "$START_DIR"
-	git stash--helper branch "$@"
-	;;
-*)
-	case $# in
-	0)
-		cd "$START_DIR"
-		git stash--helper push &&
-		say "$(gettext "(To restore them type \"git stash apply\")")"
-		;;
-	*)
-		usage
-	esac
-	;;
-esac
diff --git a/git.c b/git.c
index 76ee02802e..49ab91b4ec 100644
--- a/git.c
+++ b/git.c
@@ -554,7 +554,7 @@ static struct cmd_struct commands[] = {
 	{ "show-index", cmd_show_index },
 	{ "show-ref", cmd_show_ref, RUN_SETUP },
 	{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
-	{ "stash--helper", cmd_stash__helper, RUN_SETUP | NEED_WORK_TREE },
+	{ "stash", cmd_stash, RUN_SETUP | NEED_WORK_TREE },
 	{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
 	{ "stripspace", cmd_stripspace },
 	{ "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT },
-- 
2.19.1.878.g0482332a22

[PATCH v11 21/22] stash: optimize `get_untracked_files()` and `check_changes()`

[Paul-Sebastian Ungureanu]

This commits introduces a optimization by avoiding calling the
same functions again. For example, `git stash push -u`
would call at some points the following functions:

 * `check_changes()` (inside `do_push_stash()`)
 * `do_create_stash()`, which calls: `check_changes()` and
`get_untracked_files()`

Note that `check_changes()` also calls `get_untracked_files()`.
So, `check_changes()` is called 2 times and `get_untracked_files()`
3 times.

The old function `check_changes()` now consists of two functions:
`get_untracked_files()` and `check_changes_tracked_files()`.

These are the call chains for `push` and `create`:

 * `push_stash()` -> `do_push_stash()` -> `do_create_stash()`

 * `create_stash()` -> `do_create_stash()`

To prevent calling the same functions over and over again,
`check_changes()` inside `do_create_stash()` is now placed
in the caller functions (`create_stash()` and `do_push_stash()`).
This way `check_changes()` and `get_untracked files()` are called
only one time.

https://public-inbox.org/git/20180818223329.GJ11326@hank.intra.tgummerer.com/

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash.c | 50 ++++++++++++++++++++++++++++---------------------
 1 file changed, 29 insertions(+), 21 deletions(-)

diff --git a/builtin/stash.c b/builtin/stash.c
index c76a1936d5..5ad0f443ca 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -879,18 +879,18 @@ static int get_untracked_files(struct pathspec ps, int include_untracked,
 }
 
 /*
- * The return value of `check_changes()` can be:
+ * The return value of `check_changes_tracked_files()` can be:
  *
  * < 0 if there was an error
  * = 0 if there are no changes.
  * > 0 if there are changes.
  */
-static int check_changes(struct pathspec ps, int include_untracked)
+
+static int check_changes_tracked_files(struct pathspec ps)
 {
 	int result;
 	struct rev_info rev;
 	struct object_id dummy;
-	struct strbuf out = STRBUF_INIT;
 
 	/* No initial commit. */
 	if (get_oid("HEAD", &dummy))
@@ -918,14 +918,26 @@ static int check_changes(struct pathspec ps, int include_untracked)
 	if (diff_result_code(&rev.diffopt, result))
 		return 1;
 
+	return 0;
+}
+
+/*
+ * The function will fill `untracked_files` with the names of untracked files
+ * It will return 1 if there were any changes and 0 if there were not.
+ */
+
+static int check_changes(struct pathspec ps, int include_untracked,
+			 struct strbuf *untracked_files)
+{
+	int ret = 0;
+	if (check_changes_tracked_files(ps))
+		ret = 1;
+
 	if (include_untracked && get_untracked_files(ps, include_untracked,
-						     &out)) {
-		strbuf_release(&out);
-		return 1;
-	}
+						     untracked_files))
+		ret = 1;
 
-	strbuf_release(&out);
-	return 0;
+	return ret;
 }
 
 static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
@@ -1134,7 +1146,7 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 		head_commit = lookup_commit(the_repository, &info->b_commit);
 	}
 
-	if (!check_changes(ps, include_untracked)) {
+	if (!check_changes(ps, include_untracked, &untracked_files)) {
 		ret = 1;
 		goto done;
 	}
@@ -1159,8 +1171,7 @@ static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
 		goto done;
 	}
 
-	if (include_untracked && get_untracked_files(ps, include_untracked,
-						     &untracked_files)) {
+	if (include_untracked) {
 		if (save_untracked_files(info, &msg, untracked_files)) {
 			if (!quiet)
 				fprintf_ln(stderr, _("Cannot save "
@@ -1235,18 +1246,14 @@ static int create_stash(int argc, const char **argv, const char *prefix)
 	strbuf_join_argv(&stash_msg_buf, argc - 1, ++argv, ' ');
 
 	memset(&ps, 0, sizeof(ps));
-	ret = do_create_stash(ps, &stash_msg_buf, 0, 0, &info, NULL, 0);
+	if (!check_changes_tracked_files(ps))
+		return 0;
 
-	if (!ret)
+	if (!(ret = do_create_stash(ps, &stash_msg_buf, 0, 0, &info, NULL, 0)))
 		printf_ln("%s", oid_to_hex(&info.w_commit));
 
 	strbuf_release(&stash_msg_buf);
-
-	/*
-	 * ret can be 1 if there were no changes. In this case, we should
-	 * not error out.
-	 */
-	return ret < 0;
+	return ret;
 }
 
 static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
@@ -1256,6 +1263,7 @@ static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
 	struct stash_info info;
 	struct strbuf patch = STRBUF_INIT;
 	struct strbuf stash_msg_buf = STRBUF_INIT;
+	struct strbuf untracked_files = STRBUF_INIT;
 
 	if (patch_mode && keep_index == -1)
 		keep_index = 1;
@@ -1290,7 +1298,7 @@ static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
 		goto done;
 	}
 
-	if (!check_changes(ps, include_untracked)) {
+	if (!check_changes(ps, include_untracked, &untracked_files)) {
 		if (!quiet)
 			printf_ln(_("No local changes to save"));
 		goto done;
-- 
2.19.1.878.g0482332a22

[PATCH v11 22/22] stash: replace all `write-tree` child processes with API calls

[Paul-Sebastian Ungureanu]

This commit replaces spawning `git write-tree` with API calls.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
---
 builtin/stash.c | 41 ++++++++++++-----------------------------
 1 file changed, 12 insertions(+), 29 deletions(-)

diff --git a/builtin/stash.c b/builtin/stash.c
index 5ad0f443ca..029e209176 100644
--- a/builtin/stash.c
+++ b/builtin/stash.c
@@ -945,9 +945,8 @@ static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 {
 	int ret = 0;
 	struct strbuf untracked_msg = STRBUF_INIT;
-	struct strbuf out = STRBUF_INIT;
 	struct child_process cp_upd_index = CHILD_PROCESS_INIT;
-	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+	struct index_state istate = { NULL };
 
 	cp_upd_index.git_cmd = 1;
 	argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
@@ -962,15 +961,11 @@ static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 		goto done;
 	}
 
-	cp_write_tree.git_cmd = 1;
-	argv_array_push(&cp_write_tree.args, "write-tree");
-	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
-			 stash_index_path.buf);
-	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+	if (write_index_as_tree(&info->u_tree, &istate, stash_index_path.buf, 0,
+				NULL)) {
 		ret = -1;
 		goto done;
 	}
-	get_oid_hex(out.buf, &info->u_tree);
 
 	if (commit_tree(untracked_msg.buf, untracked_msg.len,
 			&info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
@@ -979,8 +974,8 @@ static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
 	}
 
 done:
+	discard_index(&istate);
 	strbuf_release(&untracked_msg);
-	strbuf_release(&out);
 	remove_path(stash_index_path.buf);
 	return ret;
 }
@@ -989,11 +984,10 @@ static int stash_patch(struct stash_info *info, struct pathspec ps,
 		       struct strbuf *out_patch, int quiet)
 {
 	int ret = 0;
-	struct strbuf out = STRBUF_INIT;
 	struct child_process cp_read_tree = CHILD_PROCESS_INIT;
 	struct child_process cp_add_i = CHILD_PROCESS_INIT;
-	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
 	struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
+	struct index_state istate = { NULL };
 
 	remove_path(stash_index_path.buf);
 
@@ -1019,17 +1013,12 @@ static int stash_patch(struct stash_info *info, struct pathspec ps,
 	}
 
 	/* State of the working tree. */
-	cp_write_tree.git_cmd = 1;
-	argv_array_push(&cp_write_tree.args, "write-tree");
-	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
-			 stash_index_path.buf);
-	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+	if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
+				NULL)) {
 		ret = -1;
 		goto done;
 	}
 
-	get_oid_hex(out.buf, &info->w_tree);
-
 	cp_diff_tree.git_cmd = 1;
 	argv_array_pushl(&cp_diff_tree.args, "diff-tree", "-p", "HEAD",
 			 oid_to_hex(&info->w_tree), "--", NULL);
@@ -1045,7 +1034,7 @@ static int stash_patch(struct stash_info *info, struct pathspec ps,
 	}
 
 done:
-	strbuf_release(&out);
+	discard_index(&istate);
 	remove_path(stash_index_path.buf);
 	return ret;
 }
@@ -1055,9 +1044,8 @@ static int stash_working_tree(struct stash_info *info, struct pathspec ps)
 	int ret = 0;
 	struct rev_info rev;
 	struct child_process cp_upd_index = CHILD_PROCESS_INIT;
-	struct child_process cp_write_tree = CHILD_PROCESS_INIT;
-	struct strbuf out = STRBUF_INIT;
 	struct strbuf diff_output = STRBUF_INIT;
+	struct index_state istate = { NULL };
 
 	set_alternate_index_output(stash_index_path.buf);
 	if (reset_tree(&info->i_tree, 0, 0)) {
@@ -1096,20 +1084,15 @@ static int stash_working_tree(struct stash_info *info, struct pathspec ps)
 		goto done;
 	}
 
-	cp_write_tree.git_cmd = 1;
-	argv_array_push(&cp_write_tree.args, "write-tree");
-	argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
-			 stash_index_path.buf);
-	if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+	if (write_index_as_tree(&info->w_tree, &istate, stash_index_path.buf, 0,
+				NULL)) {
 		ret = -1;
 		goto done;
 	}
 
-	get_oid_hex(out.buf, &info->w_tree);
-
 done:
+	discard_index(&istate);
 	UNLEAK(rev);
-	strbuf_release(&out);
 	object_array_clear(&rev.pending);
 	strbuf_release(&diff_output);
 	remove_path(stash_index_path.buf);
-- 
2.19.1.878.g0482332a22

Re: [PATCH v11 03/22] strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`

[Thomas Gummerer]

On 11/23, Paul-Sebastian Ungureanu wrote:
> Implement `strbuf_insertf()` and `strbuf_vinsertf()` to
> insert data using a printf format string.
> 
> Original-idea-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
> ---
>  strbuf.c | 36 ++++++++++++++++++++++++++++++++++++
>  strbuf.h |  9 +++++++++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/strbuf.c b/strbuf.c
> index 82e90f1dfe..bfbbdadbf3 100644
> --- a/strbuf.c
> +++ b/strbuf.c
> @@ -249,6 +249,42 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
>  	strbuf_splice(sb, pos, 0, data, len);
>  }
>  
> +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
> +{
> +	int len, len2;
> +	char save;
> +	va_list cp;
> +
> +	if (pos > sb->len)
> +		die("`pos' is too far after the end of the buffer");

I was going to ask about translation of this and other messages in
'die()' calls, but I see other messages in strbuf.c are not marked for
translation either.  It may make sense to mark them all for
translation at some point in the future, but having them all
untranslated for now makes sense.

In the long run it may even be better to return an error here rather
than 'die()'ing, but again this is consistent with the rest of the
API, so this wouldn't be a good time to take that on.

> +	va_copy(cp, ap);
> +	len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);

Here we're just getting the length of what we're trying to format
(excluding the final NUL).  As the second argument is 0, we do not
modify the strbuf at this point...

> +	va_end(cp);
> +	if (len < 0)
> +		BUG("your vsnprintf is broken (returned %d)", len);
> +	if (!len)
> +		return; /* nothing to do */
> +	if (unsigned_add_overflows(sb->len, len))
> +		die("you want to use way too much memory");
> +	strbuf_grow(sb, len);

... and then we grow the strbuf by the length we previously, which
excludes the NUL character, plus one extra character, so even if pos
== len we are sure to have enough space in the strbuf ...

> +	memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
> +	/* vsnprintf() will append a NUL, overwriting one of our characters */
> +	save = sb->buf[pos + len];
> +	len2 = vsnprintf(sb->buf + pos, sb->alloc - sb->len, fmt, ap);

... and we use vsnprintf to write the formatted string to the
beginning of the buffer.  sb->alloc - sb->len can be larger than
'len', which is fine as vsnprintf doesn't write anything after the NUL
character.  And as 'strbuf_grow' adds len + 1 bytes to the strbuf
we'll always have enough space for adding the formatted string ...

> +	sb->buf[pos + len] = save;
> +	if (len2 != len)
> +		BUG("your vsnprintf is broken (returns inconsistent lengths)");
> +	strbuf_setlen(sb, sb->len + len);

And finally we set the strbuf to the new length.  So all this is just
a very roundabout way to say that this function does the right thing
according to my reading (and tests).

> +}
> +
> +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
> +{
> +	va_list ap;
> +	va_start(ap, fmt);
> +	strbuf_vinsertf(sb, pos, fmt, ap);
> +	va_end(ap);
> +}
> +
>  void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
>  {
>  	strbuf_splice(sb, pos, len, "", 0);
> diff --git a/strbuf.h b/strbuf.h
> index be02150df3..8f8fe01e68 100644
> --- a/strbuf.h
> +++ b/strbuf.h
> @@ -244,6 +244,15 @@ void strbuf_addchars(struct strbuf *sb, int c, size_t n);
>   */
>  void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
>  
> +/**
> + * Insert data to the given position of the buffer giving a printf format
> + * string. The contents will be shifted, not overwritten.
> + */
> +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
> +		     va_list ap);
> +
> +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
> +
>  /**
>   * Remove given amount of data from a given position of the buffer.
>   */
> -- 
> 2.19.1.878.g0482332a22
> 

Re: [PATCH v11 00/22] Convert "git stash" to C builtin

[Thomas Gummerer]

On 11/23, Paul-Sebastian Ungureanu wrote:
> Hello,
> 
> This is the 11th iteration of C git stash. Here are some of the changes,
> based on Thomas's and dscho's suggestions (from mailing list / pull request
> #495):

Thanks for your work on this!  I have read through the range-diff and
the new patch of this last round, and this addresses all the comments
I had on v10 (and some more :)).  I consider it
Reviewed-by: Thomas Gummerer <t.gummerer@gmail.com>

> - improved memory management. Now, the callers of `do_create_stash()`
> are responsible of freeing the parameter they pass in. Moreover, the
> stash message is now a pointer to a buffer (in the previous iteration
> it was a pointer to a string). This should make it more clear who is
> responsible of freeing the memory.
> 
> - added `strbuf_insertf()` which inserts a format string at a given
> position in the buffer.
> 
> - some minor changes (changed "!oidcmp" to "oideq")
> 
> - fixed merge conflicts
> 
> Best regards,
> Paul
> 
> Joel Teichroeb (5):
>   stash: improve option parsing test coverage
>   stash: convert apply to builtin
>   stash: convert drop and clear to builtin
>   stash: convert branch to builtin
>   stash: convert pop to builtin
> 
> Paul-Sebastian Ungureanu (17):
>   sha1-name.c: add `get_oidf()` which acts like `get_oid()`
>   strbuf.c: add `strbuf_join_argv()`
>   strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`
>   t3903: modernize style
>   stash: rename test cases to be more descriptive
>   stash: add tests for `git stash show` config
>   stash: mention options in `show` synopsis
>   stash: convert list to builtin
>   stash: convert show to builtin
>   stash: convert store to builtin
>   stash: convert create to builtin
>   stash: convert push to builtin
>   stash: make push -q quiet
>   stash: convert save to builtin
>   stash: convert `stash--helper.c` into `stash.c`
>   stash: optimize `get_untracked_files()` and `check_changes()`
>   stash: replace all `write-tree` child processes with API calls
> 
>  Documentation/git-stash.txt  |    4 +-
>  Makefile                     |    2 +-
>  builtin.h                    |    1 +
>  builtin/stash.c              | 1596 ++++++++++++++++++++++++++++++++++
>  cache.h                      |    1 +
>  git-stash.sh                 |  752 ----------------
>  git.c                        |    1 +
>  sha1-name.c                  |   19 +
>  strbuf.c                     |   51 ++
>  strbuf.h                     |   16 +
>  t/t3903-stash.sh             |  192 ++--
>  t/t3907-stash-show-config.sh |   83 ++
>  12 files changed, 1897 insertions(+), 821 deletions(-)
>  create mode 100644 builtin/stash.c
>  delete mode 100755 git-stash.sh
>  create mode 100755 t/t3907-stash-show-config.sh
> 
> -- 
> 2.19.1.878.g0482332a22
> 

Re: [PATCH v11 20/22] stash: convert `stash--helper.c` into `stash.c`

[Junio C Hamano]

Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com> writes:

> The old shell script `git-stash.sh`  was removed and replaced
> entirely by `builtin/stash.c`. In order to do that, `create` and
> `push` were adapted to work without `stash.sh`. For example, before
> this commit, `git stash create` called `git stash--helper create
> --message "$*"`. If it called `git stash--helper create "$@"`, then
> some of these changes wouldn't have been necessary.
>
> This commit also removes the word `helper` since now stash is
> called directly and not by a shell script.
>
> Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
> ---
>  .gitignore                           |   1 -
>  Makefile                             |   3 +-
>  builtin.h                            |   2 +-
>  builtin/{stash--helper.c => stash.c} | 157 +++++++++++++++------------
>  git-stash.sh                         | 153 --------------------------
>  git.c                                |   2 +-
>  6 files changed, 92 insertions(+), 226 deletions(-)
>  rename builtin/{stash--helper.c => stash.c} (91%)
>  delete mode 100755 git-stash.sh

Seeing the recent trouble in "rebase in C" and how keeping the
scripted version as "git legacy-rebase" helped us postpone the
rewritten version without ripping the whole thing out, I wonder if
we can do the same here.

Also, the remaining two patches should be done _before_ this step, I
would think.  I can understand it if the reason you have those two
after this step is because you found the opportunity for these
improvements after you wrote this step, but in the larger picture
seen by the end users of the "stash in C" and those developers who
follow the evolution of the code, the logical place for this "now we
have everything in C, we retire the scripted version" step to happen
is at the very end.

Thanks.

Re: [PATCH v11 00/22] Convert "git stash" to C builtin

[Junio C Hamano]

Thomas Gummerer <t.gummerer@gmail.com> writes:

> Thanks for your work on this!  I have read through the range-diff and
> the new patch of this last round, and this addresses all the comments
> I had on v10 (and some more :)).  I consider it
> Reviewed-by: Thomas Gummerer <t.gummerer@gmail.com>

Thanks.

One thing that bothers me is that this seems to have been rebased on
'master', but as long as we are rebasing, the updated series must
also take into account of the sd/stash-wo-user-name topic, i.e. if
we are rebasing it, it should be rebased on top of the result of

	git checkout -B ps/rebase-in-c master
	git merge --no-ff sd/stash-wo-user-name

I think.

Re: [PATCH v11 00/22] Convert "git stash" to C builtin

[Junio C Hamano]

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

> Thomas Gummerer <t.gummerer@gmail.com> writes:
>
>> Thanks for your work on this!  I have read through the range-diff and
>> the new patch of this last round, and this addresses all the comments
>> I had on v10 (and some more :)).  I consider it
>> Reviewed-by: Thomas Gummerer <t.gummerer@gmail.com>
>
> Thanks.
>
> One thing that bothers me is that this seems to have been rebased on
> 'master', but as long as we are rebasing, the updated series must
> also take into account of the sd/stash-wo-user-name topic, i.e. if
> we are rebasing it, it should be rebased on top of the result of
>
> 	git checkout -B ps/rebase-in-c master
> 	git merge --no-ff sd/stash-wo-user-name
>
> I think.

https://travis-ci.org/git/git/builds/459619672 would show that this
C reimplementation now regresses from the scripted version due to
lack of such rebasing (i.e. porting a correction from scripted one).

Re: [PATCH v11 03/22] strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`

[Johannes Schindelin]

Hi,

On Sun, 25 Nov 2018, Thomas Gummerer wrote:

> On 11/23, Paul-Sebastian Ungureanu wrote:
> > Implement `strbuf_insertf()` and `strbuf_vinsertf()` to
> > insert data using a printf format string.
> > 
> > Original-idea-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
> > ---
> >  strbuf.c | 36 ++++++++++++++++++++++++++++++++++++
> >  strbuf.h |  9 +++++++++
> >  2 files changed, 45 insertions(+)
> > 
> > diff --git a/strbuf.c b/strbuf.c
> > index 82e90f1dfe..bfbbdadbf3 100644
> > --- a/strbuf.c
> > +++ b/strbuf.c
> > @@ -249,6 +249,42 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
> >  	strbuf_splice(sb, pos, 0, data, len);
> >  }
> >  
> > +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
> > +{
> > +	int len, len2;
> > +	char save;
> > +	va_list cp;
> > +
> > +	if (pos > sb->len)
> > +		die("`pos' is too far after the end of the buffer");
> 
> I was going to ask about translation of this and other messages in
> 'die()' calls, but I see other messages in strbuf.c are not marked for
> translation either.  It may make sense to mark them all for
> translation at some point in the future, but having them all
> untranslated for now makes sense.
> 
> In the long run it may even be better to return an error here rather
> than 'die()'ing, but again this is consistent with the rest of the
> API, so this wouldn't be a good time to take that on.

I guess I was too overzealous in my copying. These conditions really
indicate bugs in the caller... So I'd actually rather change that die() to
BUG().

But then, the original code in strbuf_vaddf() calls die() and would have
to be changed, too.

> > +	va_copy(cp, ap);
> > +	len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
> 
> Here we're just getting the length of what we're trying to format
> (excluding the final NUL).  As the second argument is 0, we do not
> modify the strbuf at this point...
> 
> > +	va_end(cp);
> > +	if (len < 0)
> > +		BUG("your vsnprintf is broken (returned %d)", len);
> > +	if (!len)
> > +		return; /* nothing to do */
> > +	if (unsigned_add_overflows(sb->len, len))
> > +		die("you want to use way too much memory");
> > +	strbuf_grow(sb, len);
> 
> ... and then we grow the strbuf by the length we previously, which
> excludes the NUL character, plus one extra character, so even if pos
> == len we are sure to have enough space in the strbuf ...
> 
> > +	memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
> > +	/* vsnprintf() will append a NUL, overwriting one of our characters */
> > +	save = sb->buf[pos + len];
> > +	len2 = vsnprintf(sb->buf + pos, sb->alloc - sb->len, fmt, ap);
> 
> ... and we use vsnprintf to write the formatted string to the
> beginning of the buffer.

It is not actually the beginning of the buffer, but possibly the middle of
the buffer ;-)

> sb->alloc - sb->len can be larger than 'len', which is fine as vsnprintf
> doesn't write anything after the NUL character.  And as 'strbuf_grow'
> adds len + 1 bytes to the strbuf we'll always have enough space for
> adding the formatted string ...
> 
> > +	sb->buf[pos + len] = save;
> > +	if (len2 != len)
> > +		BUG("your vsnprintf is broken (returns inconsistent lengths)");
> > +	strbuf_setlen(sb, sb->len + len);
> 
> And finally we set the strbuf to the new length.  So all this is just
> a very roundabout way to say that this function does the right thing
> according to my reading (and tests).

:-)

It seems that Junio likes this way of reviewing, giving him confidence
that the review was thorough.

Thanks!
Dscho

> > +}
> > +
> > +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
> > +{
> > +	va_list ap;
> > +	va_start(ap, fmt);
> > +	strbuf_vinsertf(sb, pos, fmt, ap);
> > +	va_end(ap);
> > +}
> > +
> >  void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
> >  {
> >  	strbuf_splice(sb, pos, len, "", 0);
> > diff --git a/strbuf.h b/strbuf.h
> > index be02150df3..8f8fe01e68 100644
> > --- a/strbuf.h
> > +++ b/strbuf.h
> > @@ -244,6 +244,15 @@ void strbuf_addchars(struct strbuf *sb, int c, size_t n);
> >   */
> >  void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
> >  
> > +/**
> > + * Insert data to the given position of the buffer giving a printf format
> > + * string. The contents will be shifted, not overwritten.
> > + */
> > +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
> > +		     va_list ap);
> > +
> > +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
> > +
> >  /**
> >   * Remove given amount of data from a given position of the buffer.
> >   */
> > -- 
> > 2.19.1.878.g0482332a22
> > 
> 

Re: [PATCH v11 20/22] stash: convert `stash--helper.c` into `stash.c`

[Johannes Schindelin]

Hi Junio & Paul,

On Mon, 26 Nov 2018, Junio C Hamano wrote:

> Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com> writes:
> 
> > The old shell script `git-stash.sh`  was removed and replaced
> > entirely by `builtin/stash.c`. In order to do that, `create` and
> > `push` were adapted to work without `stash.sh`. For example, before
> > this commit, `git stash create` called `git stash--helper create
> > --message "$*"`. If it called `git stash--helper create "$@"`, then
> > some of these changes wouldn't have been necessary.
> >
> > This commit also removes the word `helper` since now stash is
> > called directly and not by a shell script.
> >
> > Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
> > ---
> >  .gitignore                           |   1 -
> >  Makefile                             |   3 +-
> >  builtin.h                            |   2 +-
> >  builtin/{stash--helper.c => stash.c} | 157 +++++++++++++++------------
> >  git-stash.sh                         | 153 --------------------------
> >  git.c                                |   2 +-
> >  6 files changed, 92 insertions(+), 226 deletions(-)
> >  rename builtin/{stash--helper.c => stash.c} (91%)
> >  delete mode 100755 git-stash.sh
> 
> Seeing the recent trouble in "rebase in C" and how keeping the
> scripted version as "git legacy-rebase" helped us postpone the
> rewritten version without ripping the whole thing out, I wonder if
> we can do the same here.

Feel very free to cherry-pick
https://github.com/git-for-windows/git/commit/004da7e7faa36c872868ae938e06594ea1c2f01c
and
https://github.com/git-for-windows/git/commit/cedfcd39f5a4e4beb33e16fa67c4659fd4bdabf6
which is what we carry in Git for Windows.

Ciao,
Dscho

> Also, the remaining two patches should be done _before_ this step, I
> would think.  I can understand it if the reason you have those two
> after this step is because you found the opportunity for these
> improvements after you wrote this step, but in the larger picture
> seen by the end users of the "stash in C" and those developers who
> follow the evolution of the code, the logical place for this "now we
> have everything in C, we retire the scripted version" step to happen
> is at the very end.
> 
> Thanks.
> 

Re: [PATCH v11 03/22] strbuf.c: add `strbuf_insertf()` and `strbuf_vinsertf()`

[Thomas Gummerer]

On 11/27, Johannes Schindelin wrote:
> Hi,
> 
> On Sun, 25 Nov 2018, Thomas Gummerer wrote:
> 
> > On 11/23, Paul-Sebastian Ungureanu wrote:
> > > Implement `strbuf_insertf()` and `strbuf_vinsertf()` to
> > > insert data using a printf format string.
> > > 
> > > Original-idea-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> > > Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
> > > ---
> > >  strbuf.c | 36 ++++++++++++++++++++++++++++++++++++
> > >  strbuf.h |  9 +++++++++
> > >  2 files changed, 45 insertions(+)
> > > 
> > > diff --git a/strbuf.c b/strbuf.c
> > > index 82e90f1dfe..bfbbdadbf3 100644
> > > --- a/strbuf.c
> > > +++ b/strbuf.c
> > > @@ -249,6 +249,42 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
> > >  	strbuf_splice(sb, pos, 0, data, len);
> > >  }
> > >  
> > > +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
> > > +{
> > > +	int len, len2;
> > > +	char save;
> > > +	va_list cp;
> > > +
> > > +	if (pos > sb->len)
> > > +		die("`pos' is too far after the end of the buffer");
> > 
> > I was going to ask about translation of this and other messages in
> > 'die()' calls, but I see other messages in strbuf.c are not marked for
> > translation either.  It may make sense to mark them all for
> > translation at some point in the future, but having them all
> > untranslated for now makes sense.
> > 
> > In the long run it may even be better to return an error here rather
> > than 'die()'ing, but again this is consistent with the rest of the
> > API, so this wouldn't be a good time to take that on.
> 
> I guess I was too overzealous in my copying. These conditions really
> indicate bugs in the caller... So I'd actually rather change that die() to
> BUG().
> 
> But then, the original code in strbuf_vaddf() calls die() and would have
> to be changed, too.

Right, making these 'BUG()' makes sense to me.  But at this stage of
the series it's probably better to just aim for consistency with the
surrounding code without starting to do more cleanups that were not
included in earlier iterations.  I think that's best left for patches
on top.

> > > +	va_copy(cp, ap);
> > > +	len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
> > 
> > Here we're just getting the length of what we're trying to format
> > (excluding the final NUL).  As the second argument is 0, we do not
> > modify the strbuf at this point...
> > 
> > > +	va_end(cp);
> > > +	if (len < 0)
> > > +		BUG("your vsnprintf is broken (returned %d)", len);
> > > +	if (!len)
> > > +		return; /* nothing to do */
> > > +	if (unsigned_add_overflows(sb->len, len))
> > > +		die("you want to use way too much memory");
> > > +	strbuf_grow(sb, len);
> > 
> > ... and then we grow the strbuf by the length we previously, which
> > excludes the NUL character, plus one extra character, so even if pos
> > == len we are sure to have enough space in the strbuf ...
> > 
> > > +	memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
> > > +	/* vsnprintf() will append a NUL, overwriting one of our characters */
> > > +	save = sb->buf[pos + len];
> > > +	len2 = vsnprintf(sb->buf + pos, sb->alloc - sb->len, fmt, ap);
> > 
> > ... and we use vsnprintf to write the formatted string to the
> > beginning of the buffer.
> 
> It is not actually the beginning of the buffer, but possibly the middle of
> the buffer ;-)

Oops, you're right of course :) 

> > sb->alloc - sb->len can be larger than 'len', which is fine as vsnprintf
> > doesn't write anything after the NUL character.  And as 'strbuf_grow'
> > adds len + 1 bytes to the strbuf we'll always have enough space for
> > adding the formatted string ...
> > 
> > > +	sb->buf[pos + len] = save;
> > > +	if (len2 != len)
> > > +		BUG("your vsnprintf is broken (returns inconsistent lengths)");
> > > +	strbuf_setlen(sb, sb->len + len);
> > 
> > And finally we set the strbuf to the new length.  So all this is just
> > a very roundabout way to say that this function does the right thing
> > according to my reading (and tests).
> 
> :-)
> 
> It seems that Junio likes this way of reviewing, giving him confidence
> that the review was thorough.
>
> Thanks!
> Dscho
> 
> > > +}
> > > +
> > > +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
> > > +{
> > > +	va_list ap;
> > > +	va_start(ap, fmt);
> > > +	strbuf_vinsertf(sb, pos, fmt, ap);
> > > +	va_end(ap);
> > > +}
> > > +
> > >  void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
> > >  {
> > >  	strbuf_splice(sb, pos, len, "", 0);
> > > diff --git a/strbuf.h b/strbuf.h
> > > index be02150df3..8f8fe01e68 100644
> > > --- a/strbuf.h
> > > +++ b/strbuf.h
> > > @@ -244,6 +244,15 @@ void strbuf_addchars(struct strbuf *sb, int c, size_t n);
> > >   */
> > >  void strbuf_insert(struct strbuf *sb, size_t pos, const void *, size_t);
> > >  
> > > +/**
> > > + * Insert data to the given position of the buffer giving a printf format
> > > + * string. The contents will be shifted, not overwritten.
> > > + */
> > > +void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt,
> > > +		     va_list ap);
> > > +
> > > +void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...);
> > > +
> > >  /**
> > >   * Remove given amount of data from a given position of the buffer.
> > >   */
> > > -- 
> > > 2.19.1.878.g0482332a22
> > > 
> > 

Re: [PATCH v11 20/22] stash: convert `stash--helper.c` into `stash.c`

[Ævar Arnfjörð Bjarmason]

On Tue, Nov 27 2018, Johannes Schindelin wrote:

> Hi Junio & Paul,
>
> On Mon, 26 Nov 2018, Junio C Hamano wrote:
>
>> Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com> writes:
>>
>> > The old shell script `git-stash.sh`  was removed and replaced
>> > entirely by `builtin/stash.c`. In order to do that, `create` and
>> > `push` were adapted to work without `stash.sh`. For example, before
>> > this commit, `git stash create` called `git stash--helper create
>> > --message "$*"`. If it called `git stash--helper create "$@"`, then
>> > some of these changes wouldn't have been necessary.
>> >
>> > This commit also removes the word `helper` since now stash is
>> > called directly and not by a shell script.
>> >
>> > Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com>
>> > ---
>> >  .gitignore                           |   1 -
>> >  Makefile                             |   3 +-
>> >  builtin.h                            |   2 +-
>> >  builtin/{stash--helper.c => stash.c} | 157 +++++++++++++++------------
>> >  git-stash.sh                         | 153 --------------------------
>> >  git.c                                |   2 +-
>> >  6 files changed, 92 insertions(+), 226 deletions(-)
>> >  rename builtin/{stash--helper.c => stash.c} (91%)
>> >  delete mode 100755 git-stash.sh
>>
>> Seeing the recent trouble in "rebase in C" and how keeping the
>> scripted version as "git legacy-rebase" helped us postpone the
>> rewritten version without ripping the whole thing out, I wonder if
>> we can do the same here.
>
> Feel very free to cherry-pick
> https://github.com/git-for-windows/git/commit/004da7e7faa36c872868ae938e06594ea1c2f01c
> and
> https://github.com/git-for-windows/git/commit/cedfcd39f5a4e4beb33e16fa67c4659fd4bdabf6
> which is what we carry in Git for Windows.

...and then something similar to 62c23938fa ("tests: add a special setup
where rebase.useBuiltin is off", 2018-11-14) so those of us who're
smoking next for bugs can test both and report if some of the test
setups (odd OS's etc) show a difference in behavior.

I did some of this the last time around, but then I had to e.g. smoke
next against pu, and look at the general fallout there and see what was
due to stash-in-C, it would be much better to have a
GIT_TEST_STASH_USE_BUILTIN.


>> Also, the remaining two patches should be done _before_ this step, I
>> would think.  I can understand it if the reason you have those two
>> after this step is because you found the opportunity for these
>> improvements after you wrote this step, but in the larger picture
>> seen by the end users of the "stash in C" and those developers who
>> follow the evolution of the code, the logical place for this "now we
>> have everything in C, we retire the scripted version" step to happen
>> is at the very end.
>>
>> Thanks.
>>

Re: [PATCH v11 20/22] stash: convert `stash--helper.c` into `stash.c`

[Johannes Schindelin]

[-- Attachment #1: Type: text/plain, Size: 1998 bytes --]

Hi,

On Wed, 28 Nov 2018, Ævar Arnfjörð Bjarmason wrote:

> On Tue, Nov 27 2018, Johannes Schindelin wrote:
> 
> > On Mon, 26 Nov 2018, Junio C Hamano wrote:
> >
> >> Paul-Sebastian Ungureanu <ungureanupaulsebastian@gmail.com> writes:
> >>
> >> > The old shell script `git-stash.sh`  was removed and replaced
> >> > entirely by `builtin/stash.c`. In order to do that, `create` and
> >> > `push` were adapted to work without `stash.sh`. For example, before
> >> > this commit, `git stash create` called `git stash--helper create
> >> > --message "$*"`. If it called `git stash--helper create "$@"`, then
> >> > some of these changes wouldn't have been necessary.
> >> >
> >> > This commit also removes the word `helper` since now stash is
> >> > called directly and not by a shell script.
> >>
> >> Seeing the recent trouble in "rebase in C" and how keeping the
> >> scripted version as "git legacy-rebase" helped us postpone the
> >> rewritten version without ripping the whole thing out, I wonder if
> >> we can do the same here.
> >
> > Feel very free to cherry-pick
> > https://github.com/git-for-windows/git/commit/004da7e7faa36c872868ae938e06594ea1c2f01c
> > and
> > https://github.com/git-for-windows/git/commit/cedfcd39f5a4e4beb33e16fa67c4659fd4bdabf6
> > which is what we carry in Git for Windows.
> 
> ...and then something similar to 62c23938fa ("tests: add a special setup
> where rebase.useBuiltin is off", 2018-11-14) so those of us who're
> smoking next for bugs can test both and report if some of the test
> setups (odd OS's etc) show a difference in behavior.

I allowed myself to make those changes, and to reorder the last three
patches as asked by Junio. Paul, please find the result at
https://github.com/dscho/git as `git-stash`. If you agree with it, I would
be delighted if you resubmitted it directly after Git v2.20.0 is released
(Junio, it seemed that -rc1 slipped a couple of days, and now -rc2, too,
any word when you think the final v2.20.0 is due?).

Thanks,
Dscho

Re: [PATCH v11 00/22] Convert "git stash" to C builtin

[Johannes Schindelin]

Hi Junio,

On Mon, 26 Nov 2018, Junio C Hamano wrote:

> Junio C Hamano <gitster@pobox.com> writes:
> 
> > Thomas Gummerer <t.gummerer@gmail.com> writes:
> >
> >> Thanks for your work on this!  I have read through the range-diff and
> >> the new patch of this last round, and this addresses all the comments
> >> I had on v10 (and some more :)).  I consider it
> >> Reviewed-by: Thomas Gummerer <t.gummerer@gmail.com>
> >
> > Thanks.
> >
> > One thing that bothers me is that this seems to have been rebased on
> > 'master', but as long as we are rebasing, the updated series must
> > also take into account of the sd/stash-wo-user-name topic, i.e. if
> > we are rebasing it, it should be rebased on top of the result of
> >
> > 	git checkout -B ps/rebase-in-c master
> > 	git merge --no-ff sd/stash-wo-user-name
> >
> > I think.
> 
> https://travis-ci.org/git/git/builds/459619672 would show that this
> C reimplementation now regresses from the scripted version due to
> lack of such rebasing (i.e. porting a correction from scripted one).

Oh, you know, at first I *mis-read* your mail to mean "don't you rebase
all the time!", but in this case (in contrast to earlier statements about
rebasing between iterations of patch series), you *do* want Paul to
rebase.

Let me see what I can come up with in my `git-stash` branch on
https://github.com/dscho/git

Ciao,
Dscho

Re: [PATCH v11 00/22] Convert "git stash" to C builtin

[Johannes Schindelin]

Hi Junio,

On Thu, 29 Nov 2018, Johannes Schindelin wrote:

> On Mon, 26 Nov 2018, Junio C Hamano wrote:
> 
> > Junio C Hamano <gitster@pobox.com> writes:
> > 
> > > Thomas Gummerer <t.gummerer@gmail.com> writes:
> > >
> > >> Thanks for your work on this!  I have read through the range-diff and
> > >> the new patch of this last round, and this addresses all the comments
> > >> I had on v10 (and some more :)).  I consider it
> > >> Reviewed-by: Thomas Gummerer <t.gummerer@gmail.com>
> > >
> > > Thanks.
> > >
> > > One thing that bothers me is that this seems to have been rebased on
> > > 'master', but as long as we are rebasing, the updated series must
> > > also take into account of the sd/stash-wo-user-name topic, i.e. if
> > > we are rebasing it, it should be rebased on top of the result of
> > >
> > > 	git checkout -B ps/rebase-in-c master
> > > 	git merge --no-ff sd/stash-wo-user-name
> > >
> > > I think.
> > 
> > https://travis-ci.org/git/git/builds/459619672 would show that this
> > C reimplementation now regresses from the scripted version due to
> > lack of such rebasing (i.e. porting a correction from scripted one).
> 
> Oh, you know, at first I *mis-read* your mail to mean "don't you rebase
> all the time!", but in this case (in contrast to earlier statements about
> rebasing between iterations of patch series), you *do* want Paul to
> rebase.
> 
> Let me see what I can come up with in my `git-stash` branch on
> https://github.com/dscho/git

There. I force-pushed an update that is based on sd/stash-wo-user-name and
adds a `prepare_fallback_ident(name, email)` to `ident.c` for use in the
built-in stash:

https://github.com/dscho/git/commit/d37ce623fbd32e4345c701dea822e56de1a5417f

It passes t3903 in a little over a minute with
GIT_TEST_STASH_USE_BUILTIN=true and in a little less than seven minutes
with GIT_TEST_STASH_USE_BUILTIN=false.

Ciao,
Dscho