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#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "parse-options.h"
#include "sequencer.h"
#include "rebase-interactive.h"
#include "argv-array.h"
#include "refs.h"
#include "rerere.h"
#include "run-command.h"

static GIT_PATH_FUNC(path_state_dir, "rebase-merge/")
static GIT_PATH_FUNC(path_squash_onto, "rebase-merge/squash-onto")
static GIT_PATH_FUNC(path_interactive, "rebase-merge/interactive")

static int edit_todo_file(unsigned flags)
{
	const char *todo_file = rebase_path_todo();
	struct todo_list todo_list = TODO_LIST_INIT,
		new_todo = TODO_LIST_INIT;

	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
		return error_errno(_("could not read '%s'."), todo_file);

	strbuf_stripspace(&todo_list.buf, 1);
	if (!edit_todo_list(the_repository, &todo_list,
			    &new_todo, NULL, NULL, flags) &&
	    todo_list_write_to_file(the_repository, &new_todo, todo_file, NULL, NULL,
				    -1, flags & ~(TODO_LIST_SHORTEN_IDS)) < 0)
		return error_errno(_("could not write '%s'"), todo_file);

	todo_list_release(&todo_list);
	todo_list_release(&new_todo);

	return 0;
}

static int transform_todo_file(unsigned flags)
{
	const char *todo_file = rebase_path_todo();
	struct todo_list todo_list = TODO_LIST_INIT;
	int res;

	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
		return error_errno(_("could not read '%s'."), todo_file);

	if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
					&todo_list)) {
		todo_list_release(&todo_list);
		return error(_("unusable todo list: '%s'"), todo_file);
	}

	res = todo_list_write_to_file(the_repository, &todo_list, todo_file,
				      NULL, NULL, -1, flags);
	todo_list_release(&todo_list);

	if (res)
		return error_errno(_("could not write '%s'."), todo_file);
	return 0;
}

static int get_revision_ranges(const char *upstream, const char *onto,
			       const char **head_hash,
			       char **revisions, char **shortrevisions)
{
	const char *base_rev = upstream ? upstream : onto, *shorthead;
	struct object_id orig_head;

	if (get_oid("HEAD", &orig_head))
		return error(_("no HEAD?"));

	*head_hash = find_unique_abbrev(&orig_head, GIT_MAX_HEXSZ);
	*revisions = xstrfmt("%s...%s", base_rev, *head_hash);

	shorthead = find_unique_abbrev(&orig_head, DEFAULT_ABBREV);

	if (upstream) {
		const char *shortrev;
		struct object_id rev_oid;

		get_oid(base_rev, &rev_oid);
		shortrev = find_unique_abbrev(&rev_oid, DEFAULT_ABBREV);

		*shortrevisions = xstrfmt("%s..%s", shortrev, shorthead);
	} else
		*shortrevisions = xstrdup(shorthead);

	return 0;
}

static int init_basic_state(struct replay_opts *opts, const char *head_name,
			    const char *onto, const char *orig_head)
{
	FILE *interactive;

	if (!is_directory(path_state_dir()) && mkdir_in_gitdir(path_state_dir()))
		return error_errno(_("could not create temporary %s"), path_state_dir());

	delete_reflog("REBASE_HEAD");

	interactive = fopen(path_interactive(), "w");
	if (!interactive)
		return error_errno(_("could not mark as interactive"));
	fclose(interactive);

	return write_basic_state(opts, head_name, onto, orig_head);
}

static int do_interactive_rebase(struct replay_opts *opts, unsigned flags,
				 const char *switch_to, const char *upstream,
				 const char *onto, const char *onto_name,
				 const char *squash_onto, const char *head_name,
				 const char *restrict_revision, char *raw_strategies,
				 struct string_list *commands, unsigned autosquash)
{
	int ret;
	const char *head_hash = NULL;
	char *revisions = NULL, *shortrevisions = NULL;
	struct argv_array make_script_args = ARGV_ARRAY_INIT;
	struct todo_list todo_list = TODO_LIST_INIT;

	if (prepare_branch_to_be_rebased(opts, switch_to))
		return -1;

	if (get_revision_ranges(upstream, onto, &head_hash,
				&revisions, &shortrevisions))
		return -1;

	if (raw_strategies)
		parse_strategy_opts(opts, raw_strategies);

	if (init_basic_state(opts, head_name, onto, head_hash)) {
		free(revisions);
		free(shortrevisions);

		return -1;
	}

	if (!upstream && squash_onto)
		write_file(path_squash_onto(), "%s\n", squash_onto);

	argv_array_pushl(&make_script_args, "", revisions, NULL);
	if (restrict_revision)
		argv_array_push(&make_script_args, restrict_revision);

	ret = sequencer_make_script(the_repository, &todo_list.buf,
				    make_script_args.argc, make_script_args.argv,
				    flags);

	if (ret)
		error(_("could not generate todo list"));
	else {
		discard_cache();
		if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
						&todo_list))
			BUG("unusable todo list");

		ret = complete_action(the_repository, opts, flags, shortrevisions, onto_name,
				      onto, head_hash, commands, autosquash, &todo_list);
	}

	free(revisions);
	free(shortrevisions);
	todo_list_release(&todo_list);
	argv_array_clear(&make_script_args);

	return ret;
}

static const char * const builtin_rebase_interactive_usage[] = {
	N_("git rebase--interactive [<options>]"),
	NULL
};

int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
{
	struct replay_opts opts = REPLAY_OPTS_INIT;
	unsigned flags = 0, keep_empty = 0, rebase_merges = 0, autosquash = 0;
	int abbreviate_commands = 0, rebase_cousins = -1, ret = 0;
	const char *onto = NULL, *onto_name = NULL, *restrict_revision = NULL,
		*squash_onto = NULL, *upstream = NULL, *head_name = NULL,
		*switch_to = NULL, *cmd = NULL;
	struct string_list commands = STRING_LIST_INIT_DUP;
	char *raw_strategies = NULL;
	enum {
		NONE = 0, CONTINUE, SKIP, EDIT_TODO, SHOW_CURRENT_PATCH,
		SHORTEN_OIDS, EXPAND_OIDS, CHECK_TODO_LIST, REARRANGE_SQUASH, ADD_EXEC
	} command = 0;
	struct option options[] = {
		OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
		OPT_BOOL(0, "keep-empty", &keep_empty, N_("keep empty commits")),
		OPT_BOOL(0, "allow-empty-message", &opts.allow_empty_message,
			 N_("allow commits with empty messages")),
		OPT_BOOL(0, "rebase-merges", &rebase_merges, N_("rebase merge commits")),
		OPT_BOOL(0, "rebase-cousins", &rebase_cousins,
			 N_("keep original branch points of cousins")),
		OPT_BOOL(0, "autosquash", &autosquash,
			 N_("move commits that begin with squash!/fixup!")),
		OPT_BOOL(0, "signoff", &opts.signoff, N_("sign commits")),
		OPT__VERBOSE(&opts.verbose, N_("be verbose")),
		OPT_CMDMODE(0, "continue", &command, N_("continue rebase"),
			    CONTINUE),
		OPT_CMDMODE(0, "skip", &command, N_("skip commit"), SKIP),
		OPT_CMDMODE(0, "edit-todo", &command, N_("edit the todo list"),
			    EDIT_TODO),
		OPT_CMDMODE(0, "show-current-patch", &command, N_("show the current patch"),
			    SHOW_CURRENT_PATCH),
		OPT_CMDMODE(0, "shorten-ids", &command,
			N_("shorten commit ids in the todo list"), SHORTEN_OIDS),
		OPT_CMDMODE(0, "expand-ids", &command,
			N_("expand commit ids in the todo list"), EXPAND_OIDS),
		OPT_CMDMODE(0, "check-todo-list", &command,
			N_("check the todo list"), CHECK_TODO_LIST),
		OPT_CMDMODE(0, "rearrange-squash", &command,
			N_("rearrange fixup/squash lines"), REARRANGE_SQUASH),
		OPT_CMDMODE(0, "add-exec-commands", &command,
			N_("insert exec commands in todo list"), ADD_EXEC),
		OPT_STRING(0, "onto", &onto, N_("onto"), N_("onto")),
		OPT_STRING(0, "restrict-revision", &restrict_revision,
			   N_("restrict-revision"), N_("restrict revision")),
		OPT_STRING(0, "squash-onto", &squash_onto, N_("squash-onto"),
			   N_("squash onto")),
		OPT_STRING(0, "upstream", &upstream, N_("upstream"),
			   N_("the upstream commit")),
		OPT_STRING(0, "head-name", &head_name, N_("head-name"), N_("head name")),
		{ OPTION_STRING, 'S', "gpg-sign", &opts.gpg_sign, N_("key-id"),
			N_("GPG-sign commits"),
			PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
		OPT_STRING(0, "strategy", &opts.strategy, N_("strategy"),
			   N_("rebase strategy")),
		OPT_STRING(0, "strategy-opts", &raw_strategies, N_("strategy-opts"),
			   N_("strategy options")),
		OPT_STRING(0, "switch-to", &switch_to, N_("switch-to"),
			   N_("the branch or commit to checkout")),
		OPT_STRING(0, "onto-name", &onto_name, N_("onto-name"), N_("onto name")),
		OPT_STRING(0, "cmd", &cmd, N_("cmd"), N_("the command to run")),
		OPT_RERERE_AUTOUPDATE(&opts.allow_rerere_auto),
		OPT_END()
	};

	sequencer_init_config(&opts);
	git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);

	opts.action = REPLAY_INTERACTIVE_REBASE;
	opts.allow_ff = 1;
	opts.allow_empty = 1;

	if (argc == 1)
		usage_with_options(builtin_rebase_interactive_usage, options);

	argc = parse_options(argc, argv, NULL, options,
			builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);

	opts.gpg_sign = xstrdup_or_null(opts.gpg_sign);

	flags |= keep_empty ? TODO_LIST_KEEP_EMPTY : 0;
	flags |= abbreviate_commands ? TODO_LIST_ABBREVIATE_CMDS : 0;
	flags |= rebase_merges ? TODO_LIST_REBASE_MERGES : 0;
	flags |= rebase_cousins > 0 ? TODO_LIST_REBASE_COUSINS : 0;
	flags |= command == SHORTEN_OIDS ? TODO_LIST_SHORTEN_IDS : 0;

	if (rebase_cousins >= 0 && !rebase_merges)
		warning(_("--[no-]rebase-cousins has no effect without "
			  "--rebase-merges"));

	if (cmd && *cmd) {
		string_list_split(&commands, cmd, '\n', -1);
		if (strlen(commands.items[commands.nr - 1].string) == 0)
			--commands.nr;
	}

	switch (command) {
	case NONE:
		if (!onto && !upstream)
			die(_("a base commit must be provided with --upstream or --onto"));

		ret = do_interactive_rebase(&opts, flags, switch_to, upstream, onto,
					    onto_name, squash_onto, head_name, restrict_revision,
					    raw_strategies, &commands, autosquash);
		break;
	case SKIP: {
		struct string_list merge_rr = STRING_LIST_INIT_DUP;

		rerere_clear(the_repository, &merge_rr);
		/* fallthrough */
	case CONTINUE:
		ret = sequencer_continue(the_repository, &opts);
		break;
	}
	case EDIT_TODO:
		ret = edit_todo_file(flags);
		break;
	case SHOW_CURRENT_PATCH: {
		struct child_process cmd = CHILD_PROCESS_INIT;

		cmd.git_cmd = 1;
		argv_array_pushl(&cmd.args, "show", "REBASE_HEAD", "--", NULL);
		ret = run_command(&cmd);

		break;
	}
	case SHORTEN_OIDS:
	case EXPAND_OIDS:
		ret = transform_todo_file(flags);
		break;
	case CHECK_TODO_LIST:
		ret = check_todo_list_from_file(the_repository);
		break;
	case REARRANGE_SQUASH:
		ret = rearrange_squash_in_todo_file(the_repository);
		break;
	case ADD_EXEC:
		ret = sequencer_add_exec_commands(the_repository, &commands);
		break;
	default:
		BUG("invalid command '%d'", command);
	}

	return !!ret;
}
debug log:

solving 7f1e88a087 ...
found 7f1e88a087 in https://public-inbox.org/git/20190129150159.10588-17-alban.gruin@gmail.com/
found 645ac587f7 in https://public-inbox.org/git/20190129150159.10588-15-alban.gruin@gmail.com/
found 2dbf8fc08b in https://public-inbox.org/git/20190129150159.10588-11-alban.gruin@gmail.com/
found 92026739c9 in https://public-inbox.org/git/20190129150159.10588-10-alban.gruin@gmail.com/
found 4f0eae9239 in https://public-inbox.org/git/20190129150159.10588-9-alban.gruin@gmail.com/
found 53056ee713 in https://public-inbox.org/git/20190129150159.10588-8-alban.gruin@gmail.com/
found df19ccaeb9 in https://80x24.org/mirrors/git.git
preparing index
index prepared:
100644 df19ccaeb9e8a927fcc8c9ff63a254f1d09be8d0	builtin/rebase--interactive.c

applying [1/6] https://public-inbox.org/git/20190129150159.10588-8-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index df19ccaeb9..53056ee713 100644


applying [2/6] https://public-inbox.org/git/20190129150159.10588-9-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index 53056ee713..4f0eae9239 100644


applying [3/6] https://public-inbox.org/git/20190129150159.10588-10-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index 4f0eae9239..92026739c9 100644


applying [4/6] https://public-inbox.org/git/20190129150159.10588-11-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index 92026739c9..2dbf8fc08b 100644


applying [5/6] https://public-inbox.org/git/20190129150159.10588-15-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index 2dbf8fc08b..645ac587f7 100644


applying [6/6] https://public-inbox.org/git/20190129150159.10588-17-alban.gruin@gmail.com/
diff --git a/builtin/rebase--interactive.c b/builtin/rebase--interactive.c
index 645ac587f7..7f1e88a087 100644

Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.
Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.
Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.
Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.
Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.
Checking patch builtin/rebase--interactive.c...
Applied patch builtin/rebase--interactive.c cleanly.

index at:
100644 7f1e88a08737573cfb80ca3ec4893ca6f6f39282	builtin/rebase--interactive.c

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