[libgit2.git] / src / stash.c

/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */

#include "common.h"
#include "repository.h"
#include "commit.h"
#include "tree.h"
#include "reflog.h"
#include "git2/diff.h"
#include "git2/stash.h"
#include "git2/status.h"
#include "git2/checkout.h"
#include "git2/index.h"
#include "signature.h"

static int create_error(int error, const char *msg)
{
	giterr_set(GITERR_STASH, "Cannot stash changes - %s", msg);
	return error;
}

static int retrieve_head(git_reference **out, git_repository *repo)
{
	int error = git_repository_head(out, repo);

	if (error == GIT_EUNBORNBRANCH)
		return create_error(error, "You do not have the initial commit yet.");

	return error;
}

static int append_abbreviated_oid(git_buf *out, const git_oid *b_commit)
{
	char *formatted_oid;

	formatted_oid = git_oid_allocfmt(b_commit);
	GITERR_CHECK_ALLOC(formatted_oid);

	git_buf_put(out, formatted_oid, 7);
	git__free(formatted_oid);

	return git_buf_oom(out) ? -1 : 0;
}

static int append_commit_description(git_buf *out, git_commit* commit)
{
	const char *message;
	size_t pos = 0, len;

	if (append_abbreviated_oid(out, git_commit_id(commit)) < 0)
		return -1;

	message = git_commit_message(commit);
	len = strlen(message);

	/* TODO: Replace with proper commit short message
	 * when git_commit_message_short() is implemented.
	 */
	while (pos < len && message[pos] != '\n')
		pos++;

	git_buf_putc(out, ' ');
	git_buf_put(out, message, pos);
	git_buf_putc(out, '\n');

	return git_buf_oom(out) ? -1 : 0;
}

static int retrieve_base_commit_and_message(
	git_commit **b_commit,
	git_buf *stash_message,
	git_repository *repo)
{
	git_reference *head = NULL;
	int error;

	if ((error = retrieve_head(&head, repo)) < 0)
		return error;

	if (strcmp("HEAD", git_reference_name(head)) == 0)
		error = git_buf_puts(stash_message, "(no branch): ");
	else
		error = git_buf_printf(
			stash_message,
			"%s: ",
			git_reference_name(head) + strlen(GIT_REFS_HEADS_DIR));
	if (error < 0)
		goto cleanup;

	if ((error = git_commit_lookup(
			 b_commit, repo, git_reference_target(head))) < 0)
		goto cleanup;

	if ((error = append_commit_description(stash_message, *b_commit)) < 0)
		goto cleanup;

cleanup:
	git_reference_free(head);
	return error;
}

static int build_tree_from_index(git_tree **out, git_index *index)
{
	int error;
	git_oid i_tree_oid;

	if ((error = git_index_write_tree(&i_tree_oid, index)) < 0)
		return -1;

	return git_tree_lookup(out, git_index_owner(index), &i_tree_oid);
}

static int commit_index(
	git_commit **i_commit,
	git_index *index,
	const git_signature *stasher,
	const char *message,
	const git_commit *parent)
{
	git_tree *i_tree = NULL;
	git_oid i_commit_oid;
	git_buf msg = GIT_BUF_INIT;
	int error;

	if ((error = build_tree_from_index(&i_tree, index)) < 0)
		goto cleanup;

	if ((error = git_buf_printf(&msg, "index on %s\n", message)) < 0)
		goto cleanup;

	if ((error = git_commit_create(
		&i_commit_oid,
		git_index_owner(index),
		NULL,
		stasher,
		stasher,
		NULL,
		git_buf_cstr(&msg),
		i_tree,
		1,
		&parent)) < 0)
		goto cleanup;

	error = git_commit_lookup(i_commit, git_index_owner(index), &i_commit_oid);

cleanup:
	git_tree_free(i_tree);
	git_buf_free(&msg);
	return error;
}

struct stash_update_rules {
	bool include_changed;
	bool include_untracked;
	bool include_ignored;
};

static int stash_update_index_from_diff(
	git_index *index,
	const git_diff *diff,
	struct stash_update_rules *data)
{
	int error = 0;
	size_t d, max_d = git_diff_num_deltas(diff);

	for (d = 0; !error && d < max_d; ++d) {
		const char *add_path = NULL;
		const git_diff_delta *delta = git_diff_get_delta(diff, d);

		switch (delta->status) {
		case GIT_DELTA_IGNORED:
			if (data->include_ignored)
				add_path = delta->new_file.path;
			break;

		case GIT_DELTA_UNTRACKED:
			if (data->include_untracked)
				add_path = delta->new_file.path;
			break;

		case GIT_DELTA_ADDED:
		case GIT_DELTA_MODIFIED:
			if (data->include_changed)
				add_path = delta->new_file.path;
			break;

		case GIT_DELTA_DELETED:
			if (data->include_changed &&
				!git_index_find(NULL, index, delta->old_file.path))
				error = git_index_remove(index, delta->old_file.path, 0);
			break;

		default:
			/* Unimplemented */
			giterr_set(
				GITERR_INVALID,
				"Cannot update index. Unimplemented status (%d)",
				delta->status);
			return -1;
		}

		if (add_path != NULL)
			error = git_index_add_bypath(index, add_path);
	}

	return error;
}

static int build_untracked_tree(
	git_tree **tree_out,
	git_index *index,
	git_commit *i_commit,
	uint32_t flags)
{
	git_tree *i_tree = NULL;
	git_diff *diff = NULL;
	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
	struct stash_update_rules data = {0};
	int error;

	git_index_clear(index);

	if (flags & GIT_STASH_INCLUDE_UNTRACKED) {
		opts.flags |= GIT_DIFF_INCLUDE_UNTRACKED |
			GIT_DIFF_RECURSE_UNTRACKED_DIRS;
		data.include_untracked = true;
	}

	if (flags & GIT_STASH_INCLUDE_IGNORED) {
		opts.flags |= GIT_DIFF_INCLUDE_IGNORED;
		data.include_ignored = true;
	}

	if ((error = git_commit_tree(&i_tree, i_commit)) < 0)
		goto cleanup;

	if ((error = git_diff_tree_to_workdir(
			&diff, git_index_owner(index), i_tree, &opts)) < 0)
		goto cleanup;

	if ((error = stash_update_index_from_diff(index, diff, &data)) < 0)
		goto cleanup;

	error = build_tree_from_index(tree_out, index);

cleanup:
	git_diff_free(diff);
	git_tree_free(i_tree);
	return error;
}

static int commit_untracked(
	git_commit **u_commit,
	git_index *index,
	const git_signature *stasher,
	const char *message,
	git_commit *i_commit,
	uint32_t flags)
{
	git_tree *u_tree = NULL;
	git_oid u_commit_oid;
	git_buf msg = GIT_BUF_INIT;
	int error;

	if ((error = build_untracked_tree(&u_tree, index, i_commit, flags)) < 0)
		goto cleanup;

	if ((error = git_buf_printf(&msg, "untracked files on %s\n", message)) < 0)
		goto cleanup;

	if ((error = git_commit_create(
		&u_commit_oid,
		git_index_owner(index),
		NULL,
		stasher,
		stasher,
		NULL,
		git_buf_cstr(&msg),
		u_tree,
		0,
		NULL)) < 0)
		goto cleanup;

	error = git_commit_lookup(u_commit, git_index_owner(index), &u_commit_oid);

cleanup:
	git_tree_free(u_tree);
	git_buf_free(&msg);
	return error;
}

static int build_workdir_tree(
	git_tree **tree_out,
	git_index *index,
	git_commit *b_commit)
{
	git_repository *repo = git_index_owner(index);
	git_tree *b_tree = NULL;
	git_diff *diff = NULL;
	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
	struct stash_update_rules data = {0};
	int error;

	opts.flags = GIT_DIFF_IGNORE_SUBMODULES;

	if ((error = git_commit_tree(&b_tree, b_commit)) < 0)
		goto cleanup;

	if ((error = git_diff_tree_to_workdir_with_index(
			&diff, repo, b_tree, &opts)) < 0)
		goto cleanup;

	data.include_changed = true;

	if ((error = stash_update_index_from_diff(index, diff, &data)) < 0)
		goto cleanup;

	error = build_tree_from_index(tree_out, index);

cleanup:
	git_diff_free(diff);
	git_tree_free(b_tree);

	return error;
}

static int commit_worktree(
	git_oid *w_commit_oid,
	git_index *index,
	const git_signature *stasher,
	const char *message,
	git_commit *i_commit,
	git_commit *b_commit,
	git_commit *u_commit)
{
	int error = 0;
	git_tree *w_tree = NULL, *i_tree = NULL;
	const git_commit *parents[] = {	NULL, NULL,	NULL };

	parents[0] = b_commit;
	parents[1] = i_commit;
	parents[2] = u_commit;

	if ((error = git_commit_tree(&i_tree, i_commit)) < 0)
		goto cleanup;

	if ((error = git_index_read_tree(index, i_tree)) < 0)
		goto cleanup;

	if ((error = build_workdir_tree(&w_tree, index, b_commit)) < 0)
		goto cleanup;

	error = git_commit_create(
		w_commit_oid,
		git_index_owner(index),
		NULL,
		stasher,
		stasher,
		NULL,
		message,
		w_tree,
		u_commit ? 3 : 2,
		parents);

cleanup:
	git_tree_free(i_tree);
	git_tree_free(w_tree);
	return error;
}

static int prepare_worktree_commit_message(
	git_buf* msg,
	const char *user_message)
{
	git_buf buf = GIT_BUF_INIT;
	int error;

	if ((error = git_buf_set(&buf, git_buf_cstr(msg), git_buf_len(msg))) < 0)
		return error;

	git_buf_clear(msg);

	if (!user_message)
		git_buf_printf(msg, "WIP on %s", git_buf_cstr(&buf));
	else {
		const char *colon;

		if ((colon = strchr(git_buf_cstr(&buf), ':')) == NULL)
			goto cleanup;

		git_buf_puts(msg, "On ");
		git_buf_put(msg, git_buf_cstr(&buf), colon - buf.ptr);
		git_buf_printf(msg, ": %s\n", user_message);
	}

	error = (git_buf_oom(msg) || git_buf_oom(&buf)) ? -1 : 0;

cleanup:
	git_buf_free(&buf);

	return error;
}

static int update_reflog(
	git_oid *w_commit_oid,
	git_repository *repo,
	const git_signature *stasher,
	const char *message)
{
	git_reference *stash;
	git_reflog *reflog = NULL;
	int error;

	if ((error = git_reference_create(&stash, repo, GIT_REFS_STASH_FILE, w_commit_oid, 1)) < 0)
		goto cleanup;

	git_reference_free(stash);

	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE) < 0))
		goto cleanup;

	if ((error = git_reflog_append(reflog, w_commit_oid, stasher, message)) < 0)
		goto cleanup;

	if ((error = git_reflog_write(reflog)) < 0)
		goto cleanup;

cleanup:
	git_reflog_free(reflog);
	return error;
}

static int is_dirty_cb(const char *path, unsigned int status, void *payload)
{
	GIT_UNUSED(path);
	GIT_UNUSED(status);
	GIT_UNUSED(payload);

	return GIT_PASSTHROUGH;
}

static int ensure_there_are_changes_to_stash(
	git_repository *repo,
	bool include_untracked_files,
	bool include_ignored_files)
{
	int error;
	git_status_options opts = GIT_STATUS_OPTIONS_INIT;

	opts.show  = GIT_STATUS_SHOW_INDEX_AND_WORKDIR;
	opts.flags = GIT_STATUS_OPT_EXCLUDE_SUBMODULES;

	if (include_untracked_files)
		opts.flags |= GIT_STATUS_OPT_INCLUDE_UNTRACKED |
		GIT_STATUS_OPT_RECURSE_UNTRACKED_DIRS;

	if (include_ignored_files)
		opts.flags |= GIT_STATUS_OPT_INCLUDE_IGNORED;

	error = git_status_foreach_ext(repo, &opts, is_dirty_cb, NULL);

	if (error == GIT_PASSTHROUGH)
		return 0;

	if (!error)
		return create_error(GIT_ENOTFOUND, "There is nothing to stash.");

	return error;
}

static int reset_index_and_workdir(
	git_repository *repo,
	git_commit *commit,
	bool remove_untracked)
{
	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;

	opts.checkout_strategy = GIT_CHECKOUT_FORCE;

	if (remove_untracked)
		opts.checkout_strategy |= GIT_CHECKOUT_REMOVE_UNTRACKED;

	return git_checkout_tree(repo, (git_object *)commit, &opts);
}

int git_stash_save(
	git_oid *out,
	git_repository *repo,
	const git_signature *stasher,
	const char *message,
	uint32_t flags)
{
	git_index *index = NULL;
	git_commit *b_commit = NULL, *i_commit = NULL, *u_commit = NULL;
	git_buf msg = GIT_BUF_INIT;
	int error;

	assert(out && repo && stasher);

	if ((error = git_repository__ensure_not_bare(repo, "stash save")) < 0)
		return error;

	if ((error = retrieve_base_commit_and_message(&b_commit, &msg, repo)) < 0)
		goto cleanup;

	if ((error = ensure_there_are_changes_to_stash(
		repo,
		(flags & GIT_STASH_INCLUDE_UNTRACKED) != 0,
		(flags & GIT_STASH_INCLUDE_IGNORED) != 0)) < 0)
		goto cleanup;

	if ((error = git_repository_index(&index, repo)) < 0)
		goto cleanup;

	if ((error = commit_index(
			&i_commit, index, stasher, git_buf_cstr(&msg), b_commit)) < 0)
		goto cleanup;

	if ((flags & (GIT_STASH_INCLUDE_UNTRACKED | GIT_STASH_INCLUDE_IGNORED)) &&
		(error = commit_untracked(
			&u_commit, index, stasher, git_buf_cstr(&msg),
			i_commit, flags)) < 0)
		goto cleanup;

	if ((error = prepare_worktree_commit_message(&msg, message)) < 0)
		goto cleanup;

	if ((error = commit_worktree(
			out, index, stasher, git_buf_cstr(&msg),
			i_commit, b_commit, u_commit)) < 0)
		goto cleanup;

	git_buf_rtrim(&msg);

	if ((error = update_reflog(out, repo, stasher, git_buf_cstr(&msg))) < 0)
		goto cleanup;

	if ((error = reset_index_and_workdir(
		repo,
		((flags & GIT_STASH_KEEP_INDEX) != 0) ? i_commit : b_commit,
		(flags & GIT_STASH_INCLUDE_UNTRACKED) != 0)) < 0)
		goto cleanup;

cleanup:

	git_buf_free(&msg);
	git_commit_free(i_commit);
	git_commit_free(b_commit);
	git_commit_free(u_commit);
	git_index_free(index);

	return error;
}

int git_stash_foreach(
	git_repository *repo,
	git_stash_cb callback,
	void *payload)
{
	git_reference *stash;
	git_reflog *reflog = NULL;
	int error;
	size_t i, max;
	const git_reflog_entry *entry;

	error = git_reference_lookup(&stash, repo, GIT_REFS_STASH_FILE);
	if (error == GIT_ENOTFOUND) {
		giterr_clear();
		return 0;
	}
	if (error < 0)
		goto cleanup;

	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE)) < 0)
		goto cleanup;

	max = git_reflog_entrycount(reflog);
	for (i = 0; i < max; i++) {
		entry = git_reflog_entry_byindex(reflog, i);

		error = GITERR_CALLBACK(
			callback(i,
				git_reflog_entry_message(entry),
				git_reflog_entry_id_new(entry),
				payload) );
		if (error)
			break;
	}

cleanup:
	git_reference_free(stash);
	git_reflog_free(reflog);
	return error;
}

int git_stash_drop(
	git_repository *repo,
	size_t index)
{
	git_reference *stash;
	git_reflog *reflog = NULL;
	size_t max;
	int error;

	if ((error = git_reference_lookup(&stash, repo, GIT_REFS_STASH_FILE)) < 0)
		return error;

	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE)) < 0)
		goto cleanup;

	max = git_reflog_entrycount(reflog);

	if (index > max - 1) {
		error = GIT_ENOTFOUND;
		giterr_set(GITERR_STASH, "No stashed state at position %" PRIuZ, index);
		goto cleanup;
	}

	if ((error = git_reflog_drop(reflog, index, true)) < 0)
		goto cleanup;

	if ((error = git_reflog_write(reflog)) < 0)
		goto cleanup;

	if (max == 1) {
		error = git_reference_delete(stash);
		git_reference_free(stash);
		stash = NULL;
	} else if (index == 0) {
		const git_reflog_entry *entry;

		entry = git_reflog_entry_byindex(reflog, 0);

		git_reference_free(stash);
		error = git_reference_create(&stash, repo, GIT_REFS_STASH_FILE, &entry->oid_cur, 1);
	}

cleanup:
	git_reference_free(stash);
	git_reflog_free(reflog);
	return error;
}
Commit	Line	Data
590fb68b	1	/*
359fc2d2	2	* Copyright (C) the libgit2 contributors. All rights reserved.
590fb68b	3	*
	4	* This file is part of libgit2, distributed under the GNU GPL v2 with
	5	* a Linking Exception. For full terms see the included COPYING file.
	6	*/
	7
	8	#include "common.h"
	9	#include "repository.h"
	10	#include "commit.h"
	11	#include "tree.h"
	12	#include "reflog.h"
	13	#include "git2/diff.h"
	14	#include "git2/stash.h"
	15	#include "git2/status.h"
	16	#include "git2/checkout.h"
114f5a6c	17	#include "git2/index.h"
4ec197f3	18	#include "signature.h"
590fb68b	19
	20	static int create_error(int error, const char *msg)
	21	{
	22	giterr_set(GITERR_STASH, "Cannot stash changes - %s", msg);
	23	return error;
	24	}
	25
590fb68b	26	static int retrieve_head(git_reference *out, git_repository repo)
	27	{
	28	int error = git_repository_head(out, repo);
	29
605da51a	30	if (error == GIT_EUNBORNBRANCH)
590fb68b	31	return create_error(error, "You do not have the initial commit yet.");
	32
	33	return error;
	34	}
	35
	36	static int append_abbreviated_oid(git_buf out, const git_oid b_commit)
	37	{
	38	char *formatted_oid;
	39
	40	formatted_oid = git_oid_allocfmt(b_commit);
	41	GITERR_CHECK_ALLOC(formatted_oid);
	42
	43	git_buf_put(out, formatted_oid, 7);
	44	git__free(formatted_oid);
	45
	46	return git_buf_oom(out) ? -1 : 0;
	47	}
	48
	49	static int append_commit_description(git_buf out, git_commit commit)
	50	{
	51	const char *message;
a8122b5d	52	size_t pos = 0, len;
590fb68b	53
	54	if (append_abbreviated_oid(out, git_commit_id(commit)) < 0)
	55	return -1;
	56
	57	message = git_commit_message(commit);
	58	len = strlen(message);
	59
	60	/* TODO: Replace with proper commit short message
	61	* when git_commit_message_short() is implemented.
	62	*/
	63	while (pos < len && message[pos] != '\n')
	64	pos++;
	65
	66	git_buf_putc(out, ' ');
	67	git_buf_put(out, message, pos);
	68	git_buf_putc(out, '\n');
	69
	70	return git_buf_oom(out) ? -1 : 0;
	71	}
	72
	73	static int retrieve_base_commit_and_message(
	74	git_commit **b_commit,
	75	git_buf *stash_message,
	76	git_repository *repo)
	77	{
	78	git_reference *head = NULL;
	79	int error;
	80
	81	if ((error = retrieve_head(&head, repo)) < 0)
	82	return error;
	83
590fb68b	84	if (strcmp("HEAD", git_reference_name(head)) == 0)
a6a82e1a	85	error = git_buf_puts(stash_message, "(no branch): ");
590fb68b	86	else
a6a82e1a	87	error = git_buf_printf(
590fb68b	88	stash_message,
	89	"%s: ",
	90	git_reference_name(head) + strlen(GIT_REFS_HEADS_DIR));
a6a82e1a	91	if (error < 0)
590fb68b	92	goto cleanup;
590fb68b	93
a6a82e1a RB	94	if ((error = git_commit_lookup(
a6a82e1a RB	95	b_commit, repo, git_reference_target(head))) < 0)
590fb68b	96	goto cleanup;
590fb68b	97
a6a82e1a RB	98	if ((error = append_commit_description(stash_message, *b_commit)) < 0)
a6a82e1a RB	99	goto cleanup;
590fb68b	100
	101	cleanup:
	102	git_reference_free(head);
	103	return error;
	104	}
	105
	106	static int build_tree_from_index(git_tree *out, git_index index)
	107	{
a6a82e1a	108	int error;
590fb68b	109	git_oid i_tree_oid;
590fb68b	110
a6a82e1a	111	if ((error = git_index_write_tree(&i_tree_oid, index)) < 0)
590fb68b	112	return -1;
	113
	114	return git_tree_lookup(out, git_index_owner(index), &i_tree_oid);
	115	}
	116
	117	static int commit_index(
	118	git_commit **i_commit,
	119	git_index *index,
2274993b	120	const git_signature *stasher,
590fb68b	121	const char *message,
	122	const git_commit *parent)
	123	{
	124	git_tree *i_tree = NULL;
	125	git_oid i_commit_oid;
	126	git_buf msg = GIT_BUF_INIT;
a6a82e1a	127	int error;
590fb68b	128
a6a82e1a	129	if ((error = build_tree_from_index(&i_tree, index)) < 0)
590fb68b	130	goto cleanup;
590fb68b	131
a6a82e1a	132	if ((error = git_buf_printf(&msg, "index on %s\n", message)) < 0)
590fb68b	133	goto cleanup;
590fb68b	134
a6a82e1a	135	if ((error = git_commit_create(
590fb68b	136	&i_commit_oid,
	137	git_index_owner(index),
	138	NULL,
	139	stasher,
	140	stasher,
	141	NULL,
	142	git_buf_cstr(&msg),
	143	i_tree,
	144	1,
a6a82e1a RB	145	&parent)) < 0)
a6a82e1a RB	146	goto cleanup;
590fb68b	147
	148	error = git_commit_lookup(i_commit, git_index_owner(index), &i_commit_oid);
	149
	150	cleanup:
	151	git_tree_free(i_tree);
	152	git_buf_free(&msg);
	153	return error;
	154	}
	155
10672e3e	156	struct stash_update_rules {
590fb68b	157	bool include_changed;
	158	bool include_untracked;
	159	bool include_ignored;
	160	};
	161
10672e3e RB	162	static int stash_update_index_from_diff(
	163	git_index *index,
	164	const git_diff *diff,
	165	struct stash_update_rules *data)
590fb68b	166	{
10672e3e RB	167	int error = 0;
	168	size_t d, max_d = git_diff_num_deltas(diff);
	169
	170	for (d = 0; !error && d < max_d; ++d) {
	171	const char *add_path = NULL;
	172	const git_diff_delta *delta = git_diff_get_delta(diff, d);
	173
	174	switch (delta->status) {
	175	case GIT_DELTA_IGNORED:
	176	if (data->include_ignored)
	177	add_path = delta->new_file.path;
	178	break;
	179
	180	case GIT_DELTA_UNTRACKED:
	181	if (data->include_untracked)
	182	add_path = delta->new_file.path;
590fb68b	183	break;
590fb68b	184
10672e3e RB	185	case GIT_DELTA_ADDED:
	186	case GIT_DELTA_MODIFIED:
	187	if (data->include_changed)
	188	add_path = delta->new_file.path;
	189	break;
a6a82e1a	190
10672e3e RB	191	case GIT_DELTA_DELETED:
	192	if (data->include_changed &&
	193	!git_index_find(NULL, index, delta->old_file.path))
	194	error = git_index_remove(index, delta->old_file.path, 0);
	195	break;
	196
	197	default:
	198	/* Unimplemented */
	199	giterr_set(
	200	GITERR_INVALID,
	201	"Cannot update index. Unimplemented status (%d)",
	202	delta->status);
	203	return -1;
	204	}
	205
	206	if (add_path != NULL)
	207	error = git_index_add_bypath(index, add_path);
	208	}
	209
	210	return error;
590fb68b	211	}
	212
	213	static int build_untracked_tree(
	214	git_tree **tree_out,
	215	git_index *index,
	216	git_commit *i_commit,
	217	uint32_t flags)
	218	{
	219	git_tree *i_tree = NULL;
3ff1d123	220	git_diff *diff = NULL;
2f8d30be	221	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
10672e3e	222	struct stash_update_rules data = {0};
a6a82e1a	223	int error;
590fb68b	224
	225	git_index_clear(index);
	226
590fb68b	227	if (flags & GIT_STASH_INCLUDE_UNTRACKED) {
a6a82e1a RB	228	opts.flags \|= GIT_DIFF_INCLUDE_UNTRACKED \|
a6a82e1a RB	229	GIT_DIFF_RECURSE_UNTRACKED_DIRS;
590fb68b	230	data.include_untracked = true;
	231	}
	232
	233	if (flags & GIT_STASH_INCLUDE_IGNORED) {
	234	opts.flags \|= GIT_DIFF_INCLUDE_IGNORED;
	235	data.include_ignored = true;
	236	}
	237
a6a82e1a	238	if ((error = git_commit_tree(&i_tree, i_commit)) < 0)
590fb68b	239	goto cleanup;
590fb68b	240
a6a82e1a RB	241	if ((error = git_diff_tree_to_workdir(
a6a82e1a RB	242	&diff, git_index_owner(index), i_tree, &opts)) < 0)
590fb68b	243	goto cleanup;
590fb68b	244
10672e3e	245	if ((error = stash_update_index_from_diff(index, diff, &data)) < 0)
590fb68b	246	goto cleanup;
590fb68b	247
a6a82e1a	248	error = build_tree_from_index(tree_out, index);
590fb68b	249
590fb68b	250	cleanup:
3ff1d123	251	git_diff_free(diff);
590fb68b	252	git_tree_free(i_tree);
	253	return error;
	254	}
	255
	256	static int commit_untracked(
	257	git_commit **u_commit,
	258	git_index *index,
2274993b	259	const git_signature *stasher,
590fb68b	260	const char *message,
	261	git_commit *i_commit,
	262	uint32_t flags)
	263	{
	264	git_tree *u_tree = NULL;
	265	git_oid u_commit_oid;
	266	git_buf msg = GIT_BUF_INIT;
a6a82e1a	267	int error;
590fb68b	268
a6a82e1a	269	if ((error = build_untracked_tree(&u_tree, index, i_commit, flags)) < 0)
590fb68b	270	goto cleanup;
590fb68b	271
a6a82e1a	272	if ((error = git_buf_printf(&msg, "untracked files on %s\n", message)) < 0)
590fb68b	273	goto cleanup;
590fb68b	274
a6a82e1a	275	if ((error = git_commit_create(
590fb68b	276	&u_commit_oid,
	277	git_index_owner(index),
	278	NULL,
	279	stasher,
	280	stasher,
	281	NULL,
	282	git_buf_cstr(&msg),
	283	u_tree,
	284	0,
a6a82e1a RB	285	NULL)) < 0)
a6a82e1a RB	286	goto cleanup;
590fb68b	287
	288	error = git_commit_lookup(u_commit, git_index_owner(index), &u_commit_oid);
	289
	290	cleanup:
	291	git_tree_free(u_tree);
	292	git_buf_free(&msg);
	293	return error;
	294	}
	295
	296	static int build_workdir_tree(
	297	git_tree **tree_out,
	298	git_index *index,
	299	git_commit *b_commit)
	300	{
5735bf5e	301	git_repository *repo = git_index_owner(index);
590fb68b	302	git_tree *b_tree = NULL;
10672e3e	303	git_diff *diff = NULL;
2f8d30be	304	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
10672e3e	305	struct stash_update_rules data = {0};
a6a82e1a	306	int error;
590fb68b	307
4fe0b0b3 JSS	308	opts.flags = GIT_DIFF_IGNORE_SUBMODULES;
4fe0b0b3 JSS	309
a6a82e1a	310	if ((error = git_commit_tree(&b_tree, b_commit)) < 0)
590fb68b	311	goto cleanup;
590fb68b	312
10672e3e RB	313	if ((error = git_diff_tree_to_workdir_with_index(
10672e3e RB	314	&diff, repo, b_tree, &opts)) < 0)
590fb68b	315	goto cleanup;
590fb68b	316
590fb68b	317	data.include_changed = true;
590fb68b	318
10672e3e	319	if ((error = stash_update_index_from_diff(index, diff, &data)) < 0)
590fb68b	320	goto cleanup;
590fb68b	321
10672e3e	322	error = build_tree_from_index(tree_out, index);
590fb68b	323
590fb68b	324	cleanup:
3ff1d123	325	git_diff_free(diff);
590fb68b	326	git_tree_free(b_tree);
a6a82e1a	327
590fb68b	328	return error;
	329	}
	330
	331	static int commit_worktree(
	332	git_oid *w_commit_oid,
	333	git_index *index,
2274993b	334	const git_signature *stasher,
590fb68b	335	const char *message,
	336	git_commit *i_commit,
	337	git_commit *b_commit,
	338	git_commit *u_commit)
	339	{
a6a82e1a	340	int error = 0;
590fb68b	341	git_tree w_tree = NULL, i_tree = NULL;
590fb68b	342	const git_commit *parents[] = { NULL, NULL, NULL };
	343
	344	parents[0] = b_commit;
	345	parents[1] = i_commit;
	346	parents[2] = u_commit;
	347
a6a82e1a RB	348	if ((error = git_commit_tree(&i_tree, i_commit)) < 0)
a6a82e1a RB	349	goto cleanup;
590fb68b	350
a6a82e1a	351	if ((error = git_index_read_tree(index, i_tree)) < 0)
590fb68b	352	goto cleanup;
590fb68b	353
a6a82e1a	354	if ((error = build_workdir_tree(&w_tree, index, b_commit)) < 0)
590fb68b	355	goto cleanup;
590fb68b	356
a6a82e1a	357	error = git_commit_create(
590fb68b	358	w_commit_oid,
	359	git_index_owner(index),
	360	NULL,
	361	stasher,
	362	stasher,
	363	NULL,
	364	message,
	365	w_tree,
a6a82e1a RB	366	u_commit ? 3 : 2,
a6a82e1a RB	367	parents);
590fb68b	368
	369	cleanup:
	370	git_tree_free(i_tree);
	371	git_tree_free(w_tree);
	372	return error;
	373	}
	374
	375	static int prepare_worktree_commit_message(
	376	git_buf* msg,
	377	const char *user_message)
	378	{
	379	git_buf buf = GIT_BUF_INIT;
a6a82e1a RB	380	int error;
a6a82e1a RB	381
6f58332f RB	382	if ((error = git_buf_set(&buf, git_buf_cstr(msg), git_buf_len(msg))) < 0)
6f58332f RB	383	return error;
590fb68b	384
590fb68b	385	git_buf_clear(msg);
	386
	387	if (!user_message)
	388	git_buf_printf(msg, "WIP on %s", git_buf_cstr(&buf));
	389	else {
	390	const char *colon;
	391
	392	if ((colon = strchr(git_buf_cstr(&buf), ':')) == NULL)
	393	goto cleanup;
	394
	395	git_buf_puts(msg, "On ");
	396	git_buf_put(msg, git_buf_cstr(&buf), colon - buf.ptr);
	397	git_buf_printf(msg, ": %s\n", user_message);
	398	}
	399
6f58332f	400	error = (git_buf_oom(msg) \|\| git_buf_oom(&buf)) ? -1 : 0;
590fb68b	401
	402	cleanup:
	403	git_buf_free(&buf);
a6a82e1a	404
590fb68b	405	return error;
	406	}
	407
	408	static int update_reflog(
	409	git_oid *w_commit_oid,
	410	git_repository *repo,
2274993b	411	const git_signature *stasher,
590fb68b	412	const char *message)
590fb68b	413	{
b976f3c2	414	git_reference *stash;
590fb68b	415	git_reflog *reflog = NULL;
	416	int error;
	417
2508cc66	418	if ((error = git_reference_create(&stash, repo, GIT_REFS_STASH_FILE, w_commit_oid, 1)) < 0)
590fb68b	419	goto cleanup;
590fb68b	420
b976f3c2 CMN	421	git_reference_free(stash);
	422
	423	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE) < 0))
590fb68b	424	goto cleanup;
	425
	426	if ((error = git_reflog_append(reflog, w_commit_oid, stasher, message)) < 0)
	427	goto cleanup;
	428
	429	if ((error = git_reflog_write(reflog)) < 0)
	430	goto cleanup;
	431
590fb68b	432	cleanup:
590fb68b	433	git_reflog_free(reflog);
	434	return error;
	435	}
	436
	437	static int is_dirty_cb(const char path, unsigned int status, void payload)
	438	{
	439	GIT_UNUSED(path);
	440	GIT_UNUSED(status);
	441	GIT_UNUSED(payload);
	442
25e0b157	443	return GIT_PASSTHROUGH;
590fb68b	444	}
	445
	446	static int ensure_there_are_changes_to_stash(
	447	git_repository *repo,
	448	bool include_untracked_files,
	449	bool include_ignored_files)
	450	{
	451	int error;
79cfa20d	452	git_status_options opts = GIT_STATUS_OPTIONS_INIT;
590fb68b	453
590fb68b	454	opts.show = GIT_STATUS_SHOW_INDEX_AND_WORKDIR;
4fe0b0b3 JSS	455	opts.flags = GIT_STATUS_OPT_EXCLUDE_SUBMODULES;
4fe0b0b3 JSS	456
590fb68b	457	if (include_untracked_files)
4fe0b0b3	458	opts.flags \|= GIT_STATUS_OPT_INCLUDE_UNTRACKED \|
590fb68b	459	GIT_STATUS_OPT_RECURSE_UNTRACKED_DIRS;
	460
	461	if (include_ignored_files)
4fe0b0b3	462	opts.flags \|= GIT_STATUS_OPT_INCLUDE_IGNORED;
590fb68b	463
	464	error = git_status_foreach_ext(repo, &opts, is_dirty_cb, NULL);
	465
25e0b157	466	if (error == GIT_PASSTHROUGH)
590fb68b	467	return 0;
	468
	469	if (!error)
	470	return create_error(GIT_ENOTFOUND, "There is nothing to stash.");
	471
	472	return error;
	473	}
	474
	475	static int reset_index_and_workdir(
	476	git_repository *repo,
	477	git_commit *commit,
	478	bool remove_untracked)
	479	{
b81aa2f1	480	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
590fb68b	481
cf208031	482	opts.checkout_strategy = GIT_CHECKOUT_FORCE;
590fb68b	483
	484	if (remove_untracked)
	485	opts.checkout_strategy \|= GIT_CHECKOUT_REMOVE_UNTRACKED;
	486
	487	return git_checkout_tree(repo, (git_object *)commit, &opts);
	488	}
	489
	490	int git_stash_save(
	491	git_oid *out,
	492	git_repository *repo,
2274993b	493	const git_signature *stasher,
590fb68b	494	const char *message,
	495	uint32_t flags)
	496	{
	497	git_index *index = NULL;
	498	git_commit b_commit = NULL, i_commit = NULL, *u_commit = NULL;
	499	git_buf msg = GIT_BUF_INIT;
	500	int error;
	501
	502	assert(out && repo && stasher);
	503
a6a82e1a	504	if ((error = git_repository__ensure_not_bare(repo, "stash save")) < 0)
590fb68b	505	return error;
	506
	507	if ((error = retrieve_base_commit_and_message(&b_commit, &msg, repo)) < 0)
	508	goto cleanup;
	509
	510	if ((error = ensure_there_are_changes_to_stash(
	511	repo,
a6a82e1a RB	512	(flags & GIT_STASH_INCLUDE_UNTRACKED) != 0,
a6a82e1a RB	513	(flags & GIT_STASH_INCLUDE_IGNORED) != 0)) < 0)
590fb68b	514	goto cleanup;
590fb68b	515
a6a82e1a	516	if ((error = git_repository_index(&index, repo)) < 0)
590fb68b	517	goto cleanup;
590fb68b	518
a6a82e1a RB	519	if ((error = commit_index(
a6a82e1a RB	520	&i_commit, index, stasher, git_buf_cstr(&msg), b_commit)) < 0)
590fb68b	521	goto cleanup;
590fb68b	522
a6a82e1a RB	523	if ((flags & (GIT_STASH_INCLUDE_UNTRACKED \| GIT_STASH_INCLUDE_IGNORED)) &&
	524	(error = commit_untracked(
	525	&u_commit, index, stasher, git_buf_cstr(&msg),
	526	i_commit, flags)) < 0)
590fb68b	527	goto cleanup;
590fb68b	528
a6a82e1a	529	if ((error = prepare_worktree_commit_message(&msg, message)) < 0)
590fb68b	530	goto cleanup;
590fb68b	531
a6a82e1a RB	532	if ((error = commit_worktree(
	533	out, index, stasher, git_buf_cstr(&msg),
	534	i_commit, b_commit, u_commit)) < 0)
590fb68b	535	goto cleanup;
	536
	537	git_buf_rtrim(&msg);
a6a82e1a RB	538
a6a82e1a RB	539	if ((error = update_reflog(out, repo, stasher, git_buf_cstr(&msg))) < 0)
590fb68b	540	goto cleanup;
590fb68b	541
a6a82e1a	542	if ((error = reset_index_and_workdir(
590fb68b	543	repo,
a6a82e1a RB	544	((flags & GIT_STASH_KEEP_INDEX) != 0) ? i_commit : b_commit,
a6a82e1a RB	545	(flags & GIT_STASH_INCLUDE_UNTRACKED) != 0)) < 0)
590fb68b	546	goto cleanup;
590fb68b	547
590fb68b	548	cleanup:
a6a82e1a	549
590fb68b	550	git_buf_free(&msg);
	551	git_commit_free(i_commit);
	552	git_commit_free(b_commit);
	553	git_commit_free(u_commit);
	554	git_index_free(index);
a6a82e1a	555
590fb68b	556	return error;
590fb68b	557	}
23388413	558
	559	int git_stash_foreach(
	560	git_repository *repo,
1d8ec670	561	git_stash_cb callback,
23388413	562	void *payload)
	563	{
	564	git_reference *stash;
	565	git_reflog *reflog = NULL;
	566	int error;
	567	size_t i, max;
	568	const git_reflog_entry *entry;
	569
	570	error = git_reference_lookup(&stash, repo, GIT_REFS_STASH_FILE);
52c52737 RB	571	if (error == GIT_ENOTFOUND) {
52c52737 RB	572	giterr_clear();
23388413	573	return 0;
52c52737	574	}
23388413	575	if (error < 0)
	576	goto cleanup;
	577
b976f3c2	578	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE)) < 0)
23388413	579	goto cleanup;
	580
	581	max = git_reflog_entrycount(reflog);
	582	for (i = 0; i < max; i++) {
b15df1d9	583	entry = git_reflog_entry_byindex(reflog, i);
a6a82e1a	584
25e0b157 RB	585	error = GITERR_CALLBACK(
	586	callback(i,
	587	git_reflog_entry_message(entry),
	588	git_reflog_entry_id_new(entry),
	589	payload) );
	590	if (error)
dab89f9b	591	break;
23388413	592	}
23388413	593
23388413	594	cleanup:
	595	git_reference_free(stash);
	596	git_reflog_free(reflog);
	597	return error;
	598	}
e4c64cf2	599
	600	int git_stash_drop(
	601	git_repository *repo,
	602	size_t index)
	603	{
	604	git_reference *stash;
	605	git_reflog *reflog = NULL;
	606	size_t max;
	607	int error;
	608
	609	if ((error = git_reference_lookup(&stash, repo, GIT_REFS_STASH_FILE)) < 0)
	610	return error;
	611
b976f3c2	612	if ((error = git_reflog_read(&reflog, repo, GIT_REFS_STASH_FILE)) < 0)
e4c64cf2	613	goto cleanup;
	614
	615	max = git_reflog_entrycount(reflog);
	616
	617	if (index > max - 1) {
	618	error = GIT_ENOTFOUND;
	619	giterr_set(GITERR_STASH, "No stashed state at position %" PRIuZ, index);
	620	goto cleanup;
	621	}
	622
b15df1d9	623	if ((error = git_reflog_drop(reflog, index, true)) < 0)
e4c64cf2	624	goto cleanup;
	625
	626	if ((error = git_reflog_write(reflog)) < 0)
	627	goto cleanup;
	628
	629	if (max == 1) {
	630	error = git_reference_delete(stash);
d00d5464	631	git_reference_free(stash);
e4c64cf2	632	stash = NULL;
9ccab8df	633	} else if (index == 0) {
	634	const git_reflog_entry *entry;
	635
	636	entry = git_reflog_entry_byindex(reflog, 0);
52c52737	637
d00d5464 ET	638	git_reference_free(stash);
d00d5464 ET	639	error = git_reference_create(&stash, repo, GIT_REFS_STASH_FILE, &entry->oid_cur, 1);
e4c64cf2	640	}
	641
	642	cleanup:
	643	git_reference_free(stash);
	644	git_reflog_free(reflog);
	645	return error;
	646	}