[thirdparty/git.git] / reflog-walk.c

#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"
#include "commit.h"
#include "refs.h"
#include "diff.h"
#include "repository.h"
#include "revision.h"
#include "string-list.h"
#include "reflog-walk.h"

struct complete_reflogs {
	char *ref;
	char *short_ref;
	struct reflog_info {
		struct object_id ooid, noid;
		char *email;
		timestamp_t timestamp;
		int tz;
		char *message;
	} *items;
	int nr, alloc;
};

static int read_one_reflog(struct object_id *ooid, struct object_id *noid,
		const char *email, timestamp_t timestamp, int tz,
		const char *message, void *cb_data)
{
	struct complete_reflogs *array = cb_data;
	struct reflog_info *item;

	ALLOC_GROW(array->items, array->nr + 1, array->alloc);
	item = array->items + array->nr;
	oidcpy(&item->ooid, ooid);
	oidcpy(&item->noid, noid);
	item->email = xstrdup(email);
	item->timestamp = timestamp;
	item->tz = tz;
	item->message = xstrdup(message);
	array->nr++;
	return 0;
}

static void free_complete_reflog(struct complete_reflogs *array)
{
	int i;

	if (!array)
		return;

	for (i = 0; i < array->nr; i++) {
		free(array->items[i].email);
		free(array->items[i].message);
	}
	free(array->items);
	free(array->ref);
	free(array->short_ref);
	free(array);
}

static void complete_reflogs_clear(void *util, const char *str UNUSED)
{
	struct complete_reflogs *array = util;
	free_complete_reflog(array);
}

static struct complete_reflogs *read_complete_reflog(const char *ref)
{
	struct complete_reflogs *reflogs =
		xcalloc(1, sizeof(struct complete_reflogs));
	reflogs->ref = xstrdup(ref);
	refs_for_each_reflog_ent(get_main_ref_store(the_repository), ref,
				 read_one_reflog, reflogs);
	if (reflogs->nr == 0) {
		const char *name;
		void *name_to_free;
		name = name_to_free = refs_resolve_refdup(get_main_ref_store(the_repository),
							  ref,
							  RESOLVE_REF_READING,
							  NULL, NULL);
		if (name) {
			refs_for_each_reflog_ent(get_main_ref_store(the_repository),
						 name, read_one_reflog,
						 reflogs);
			free(name_to_free);
		}
	}
	if (reflogs->nr == 0) {
		char *refname = xstrfmt("refs/%s", ref);
		refs_for_each_reflog_ent(get_main_ref_store(the_repository),
					 refname, read_one_reflog, reflogs);
		if (reflogs->nr == 0) {
			free(refname);
			refname = xstrfmt("refs/heads/%s", ref);
			refs_for_each_reflog_ent(get_main_ref_store(the_repository),
						 refname, read_one_reflog,
						 reflogs);
		}
		free(refname);
	}
	return reflogs;
}

static int get_reflog_recno_by_time(struct complete_reflogs *array,
	timestamp_t timestamp)
{
	int i;
	for (i = array->nr - 1; i >= 0; i--)
		if (timestamp >= array->items[i].timestamp)
			return i;
	return -1;
}

struct commit_reflog {
	int recno;
	enum selector_type {
		SELECTOR_NONE,
		SELECTOR_INDEX,
		SELECTOR_DATE
	} selector;
	struct complete_reflogs *reflogs;
};

struct reflog_walk_info {
	struct commit_reflog **logs;
	size_t nr, alloc;
	struct string_list complete_reflogs;
	struct commit_reflog *last_commit_reflog;
};

void init_reflog_walk(struct reflog_walk_info **info)
{
	CALLOC_ARRAY(*info, 1);
	(*info)->complete_reflogs.strdup_strings = 1;
}

void reflog_walk_info_release(struct reflog_walk_info *info)
{
	size_t i;

	if (!info)
		return;

	for (i = 0; i < info->nr; i++)
		free(info->logs[i]);
	string_list_clear_func(&info->complete_reflogs,
			       complete_reflogs_clear);
	free(info->logs);
	free(info);
}

int add_reflog_for_walk(struct reflog_walk_info *info,
		struct commit *commit, const char *name)
{
	timestamp_t timestamp = 0;
	int recno = -1;
	struct string_list_item *item;
	struct complete_reflogs *reflogs;
	char *branch, *at = strchr(name, '@');
	struct commit_reflog *commit_reflog;
	enum selector_type selector = SELECTOR_NONE;

	if (commit->object.flags & UNINTERESTING)
		die("cannot walk reflogs for %s", name);

	branch = xstrdup(name);
	if (at && at[1] == '{') {
		char *ep;
		branch[at - name] = '\0';
		recno = strtoul(at + 2, &ep, 10);
		if (*ep != '}') {
			recno = -1;
			timestamp = approxidate(at + 2);
			selector = SELECTOR_DATE;
		}
		else
			selector = SELECTOR_INDEX;
	} else
		recno = 0;

	item = string_list_lookup(&info->complete_reflogs, branch);
	if (item)
		reflogs = item->util;
	else {
		if (*branch == '\0') {
			free(branch);
			branch = refs_resolve_refdup(get_main_ref_store(the_repository),
						     "HEAD", 0, NULL, NULL);
			if (!branch)
				die("no current branch");

		}
		reflogs = read_complete_reflog(branch);
		if (!reflogs || reflogs->nr == 0) {
			char *b;
			int ret = repo_dwim_log(the_repository, branch, strlen(branch),
						NULL, &b);
			if (ret > 1)
				free(b);
			else if (ret == 1) {
				free_complete_reflog(reflogs);
				free(branch);
				branch = b;
				reflogs = read_complete_reflog(branch);
			}
		}
		if (!reflogs || reflogs->nr == 0) {
			free_complete_reflog(reflogs);
			free(branch);
			return -1;
		}
		string_list_insert(&info->complete_reflogs, branch)->util
			= reflogs;
	}
	free(branch);

	CALLOC_ARRAY(commit_reflog, 1);
	if (recno < 0) {
		commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
		if (commit_reflog->recno < 0) {
			free(commit_reflog);
			return -1;
		}
	} else
		commit_reflog->recno = reflogs->nr - recno - 1;
	commit_reflog->selector = selector;
	commit_reflog->reflogs = reflogs;

	ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
	info->logs[info->nr++] = commit_reflog;

	return 0;
}

void get_reflog_selector(struct strbuf *sb,
			 struct reflog_walk_info *reflog_info,
			 struct date_mode dmode, int force_date,
			 int shorten)
{
	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	struct reflog_info *info;
	const char *printed_ref;

	if (!commit_reflog)
		return;

	if (shorten) {
		if (!commit_reflog->reflogs->short_ref)
			commit_reflog->reflogs->short_ref
				= refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
							       commit_reflog->reflogs->ref,
							       0);
		printed_ref = commit_reflog->reflogs->short_ref;
	} else {
		printed_ref = commit_reflog->reflogs->ref;
	}

	strbuf_addf(sb, "%s@{", printed_ref);
	if (commit_reflog->selector == SELECTOR_DATE ||
	    (commit_reflog->selector == SELECTOR_NONE && force_date)) {
		info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
		strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	} else {
		strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
			    - 2 - commit_reflog->recno);
	}

	strbuf_addch(sb, '}');
}

void get_reflog_message(struct strbuf *sb,
			struct reflog_walk_info *reflog_info)
{
	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	struct reflog_info *info;
	size_t len;

	if (!commit_reflog)
		return;

	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	len = strlen(info->message);
	if (len > 0)
		len--; /* strip away trailing newline */
	strbuf_add(sb, info->message, len);
}

const char *get_reflog_ident(struct reflog_walk_info *reflog_info)
{
	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	struct reflog_info *info;

	if (!commit_reflog)
		return NULL;

	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	return info->email;
}

timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
{
	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	struct reflog_info *info;

	if (!commit_reflog)
		return 0;

	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	return info->timestamp;
}

void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
			 struct date_mode dmode, int force_date)
{
	if (reflog_info && reflog_info->last_commit_reflog) {
		struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
		struct reflog_info *info;
		struct strbuf selector = STRBUF_INIT;

		info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
		get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
		if (oneline) {
			printf("%s: %s", selector.buf, info->message);
		}
		else {
			printf("Reflog: %s (%s)\nReflog message: %s",
			       selector.buf, info->email, info->message);
		}

		strbuf_release(&selector);
	}
}

int reflog_walk_empty(struct reflog_walk_info *info)
{
	return !info || !info->nr;
}

static struct commit *next_reflog_commit(struct commit_reflog *log)
{
	for (; log->recno >= 0; log->recno--) {
		struct reflog_info *entry = &log->reflogs->items[log->recno];
		struct object *obj = parse_object(the_repository,
						  &entry->noid);

		if (obj && obj->type == OBJ_COMMIT)
			return (struct commit *)obj;
	}
	return NULL;
}

static timestamp_t log_timestamp(struct commit_reflog *log)
{
	return log->reflogs->items[log->recno].timestamp;
}

struct commit *next_reflog_entry(struct reflog_walk_info *walk)
{
	struct commit_reflog *best = NULL;
	struct commit *best_commit = NULL;
	size_t i;

	for (i = 0; i < walk->nr; i++) {
		struct commit_reflog *log = walk->logs[i];
		struct commit *commit = next_reflog_commit(log);

		if (!commit)
			continue;

		if (!best || log_timestamp(log) > log_timestamp(best)) {
			best = log;
			best_commit = commit;
		}
	}

	if (best) {
		best->recno--;
		walk->last_commit_reflog = best;
		return best_commit;
	}

	return NULL;
}
Commit	Line	Data
e7da9385 PS	1	#define USE_THE_REPOSITORY_VARIABLE
e7da9385 PS	2
36bf1958	3	#include "git-compat-util.h"
8860fd42 JS	4	#include "commit.h"
	5	#include "refs.h"
	6	#include "diff.h"
df6e8744	7	#include "repository.h"
8860fd42	8	#include "revision.h"
c455c87c	9	#include "string-list.h"
53645a3a	10	#include "reflog-walk.h"
8860fd42 JS	11
	12	struct complete_reflogs {
	13	char *ref;
81ffbf83	14	char *short_ref;
8860fd42	15	struct reflog_info {
8ebc3fd0	16	struct object_id ooid, noid;
8860fd42	17	char *email;
dddbad72	18	timestamp_t timestamp;
8860fd42 JS	19	int tz;
	20	char *message;
	21	} *items;
	22	int nr, alloc;
	23	};
	24
9461d272	25	static int read_one_reflog(struct object_id ooid, struct object_id noid,
dddbad72	26	const char *email, timestamp_t timestamp, int tz,
8860fd42 JS	27	const char message, void cb_data)
	28	{
	29	struct complete_reflogs *array = cb_data;
	30	struct reflog_info *item;
	31
6647cc26	32	ALLOC_GROW(array->items, array->nr + 1, array->alloc);
8860fd42	33	item = array->items + array->nr;
9461d272	34	oidcpy(&item->ooid, ooid);
9461d272	35	oidcpy(&item->noid, noid);
8860fd42 JS	36	item->email = xstrdup(email);
	37	item->timestamp = timestamp;
	38	item->tz = tz;
	39	item->message = xstrdup(message);
	40	array->nr++;
	41	return 0;
	42	}
	43
e30d463d JK	44	static void free_complete_reflog(struct complete_reflogs *array)
	45	{
	46	int i;
	47
	48	if (!array)
	49	return;
	50
	51	for (i = 0; i < array->nr; i++) {
	52	free(array->items[i].email);
	53	free(array->items[i].message);
	54	}
	55	free(array->items);
	56	free(array->ref);
81ffbf83	57	free(array->short_ref);
e30d463d JK	58	free(array);
	59	}
	60
1ee34710	61	static void complete_reflogs_clear(void util, const char str UNUSED)
81ffbf83 ÆAB	62	{
	63	struct complete_reflogs *array = util;
	64	free_complete_reflog(array);
	65	}
	66
8860fd42 JS	67	static struct complete_reflogs read_complete_reflog(const char ref)
	68	{
	69	struct complete_reflogs *reflogs =
8e1aa2f7	70	xcalloc(1, sizeof(struct complete_reflogs));
8860fd42	71	reflogs->ref = xstrdup(ref);
2e5c4758 PS	72	refs_for_each_reflog_ent(get_main_ref_store(the_repository), ref,
2e5c4758 PS	73	read_one_reflog, reflogs);
8860fd42	74	if (reflogs->nr == 0) {
96ec7b1e NTND	75	const char *name;
96ec7b1e NTND	76	void *name_to_free;
2e5c4758 PS	77	name = name_to_free = refs_resolve_refdup(get_main_ref_store(the_repository),
	78	ref,
	79	RESOLVE_REF_READING,
	80	NULL, NULL);
d5a35c11	81	if (name) {
2e5c4758 PS	82	refs_for_each_reflog_ent(get_main_ref_store(the_repository),
	83	name, read_one_reflog,
	84	reflogs);
96ec7b1e	85	free(name_to_free);
d5a35c11	86	}
8860fd42 JS	87	}
8860fd42 JS	88	if (reflogs->nr == 0) {
75faa45a	89	char *refname = xstrfmt("refs/%s", ref);
2e5c4758 PS	90	refs_for_each_reflog_ent(get_main_ref_store(the_repository),
2e5c4758 PS	91	refname, read_one_reflog, reflogs);
8860fd42	92	if (reflogs->nr == 0) {
75faa45a JK	93	free(refname);
75faa45a JK	94	refname = xstrfmt("refs/heads/%s", ref);
2e5c4758 PS	95	refs_for_each_reflog_ent(get_main_ref_store(the_repository),
	96	refname, read_one_reflog,
	97	reflogs);
8860fd42 JS	98	}
	99	free(refname);
	100	}
	101	return reflogs;
	102	}
	103
	104	static int get_reflog_recno_by_time(struct complete_reflogs *array,
dddbad72	105	timestamp_t timestamp)
8860fd42 JS	106	{
8860fd42 JS	107	int i;
40ab7c33	108	for (i = array->nr - 1; i >= 0; i--)
8860fd42 JS	109	if (timestamp >= array->items[i].timestamp)
	110	return i;
	111	return -1;
	112	}
	113
8860fd42	114	struct commit_reflog {
a763126b JK	115	int recno;
	116	enum selector_type {
	117	SELECTOR_NONE,
	118	SELECTOR_INDEX,
	119	SELECTOR_DATE
	120	} selector;
8860fd42 JS	121	struct complete_reflogs *reflogs;
	122	};
	123
	124	struct reflog_walk_info {
d08565bf JK	125	struct commit_reflog **logs;
d08565bf JK	126	size_t nr, alloc;
c455c87c	127	struct string_list complete_reflogs;
8860fd42 JS	128	struct commit_reflog *last_commit_reflog;
	129	};
	130
24d36f14	131	void init_reflog_walk(struct reflog_walk_info **info)
8860fd42	132	{
ca56dadb	133	CALLOC_ARRAY(*info, 1);
75afe7ac	134	(*info)->complete_reflogs.strdup_strings = 1;
8860fd42 JS	135	}
8860fd42 JS	136
81ffbf83 ÆAB	137	void reflog_walk_info_release(struct reflog_walk_info *info)
	138	{
	139	size_t i;
	140
	141	if (!info)
	142	return;
	143
	144	for (i = 0; i < info->nr; i++)
	145	free(info->logs[i]);
	146	string_list_clear_func(&info->complete_reflogs,
	147	complete_reflogs_clear);
	148	free(info->logs);
	149	free(info);
	150	}
	151
7b69b873	152	int add_reflog_for_walk(struct reflog_walk_info *info,
8860fd42 JS	153	struct commit commit, const char name)
8860fd42 JS	154	{
dddbad72	155	timestamp_t timestamp = 0;
8860fd42	156	int recno = -1;
c455c87c	157	struct string_list_item *item;
8860fd42 JS	158	struct complete_reflogs *reflogs;
	159	char branch, at = strchr(name, '@');
	160	struct commit_reflog *commit_reflog;
a763126b	161	enum selector_type selector = SELECTOR_NONE;
8860fd42	162
db055e65	163	if (commit->object.flags & UNINTERESTING)
1a07e59c	164	die("cannot walk reflogs for %s", name);
db055e65	165
8860fd42 JS	166	branch = xstrdup(name);
	167	if (at && at[1] == '{') {
	168	char *ep;
	169	branch[at - name] = '\0';
	170	recno = strtoul(at + 2, &ep, 10);
	171	if (*ep != '}') {
	172	recno = -1;
	173	timestamp = approxidate(at + 2);
a763126b	174	selector = SELECTOR_DATE;
8860fd42	175	}
a763126b JK	176	else
a763126b JK	177	selector = SELECTOR_INDEX;
8860fd42 JS	178	} else
	179	recno = 0;
	180
e8c8b713	181	item = string_list_lookup(&info->complete_reflogs, branch);
8860fd42 JS	182	if (item)
	183	reflogs = item->util;
	184	else {
d271fd53	185	if (*branch == '\0') {
d271fd53	186	free(branch);
2e5c4758 PS	187	branch = refs_resolve_refdup(get_main_ref_store(the_repository),
2e5c4758 PS	188	"HEAD", 0, NULL, NULL);
96ec7b1e	189	if (!branch)
1a07e59c	190	die("no current branch");
96ec7b1e	191
d271fd53	192	}
8860fd42	193	reflogs = read_complete_reflog(branch);
eb3a4822	194	if (!reflogs \|\| reflogs->nr == 0) {
eb3a4822	195	char *b;
2bb444b1 PS	196	int ret = repo_dwim_log(the_repository, branch, strlen(branch),
2bb444b1 PS	197	NULL, &b);
5026b471 JS	198	if (ret > 1)
	199	free(b);
	200	else if (ret == 1) {
e30d463d	201	free_complete_reflog(reflogs);
eb3a4822 JS	202	free(branch);
	203	branch = b;
	204	reflogs = read_complete_reflog(branch);
	205	}
	206	}
5026b471	207	if (!reflogs \|\| reflogs->nr == 0) {
e30d463d	208	free_complete_reflog(reflogs);
5026b471	209	free(branch);
7b69b873	210	return -1;
5026b471	211	}
78a395d3	212	string_list_insert(&info->complete_reflogs, branch)->util
8860fd42 JS	213	= reflogs;
8860fd42 JS	214	}
5026b471	215	free(branch);
8860fd42	216
ca56dadb	217	CALLOC_ARRAY(commit_reflog, 1);
8860fd42	218	if (recno < 0) {
8860fd42 JS	219	commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
8860fd42 JS	220	if (commit_reflog->recno < 0) {
8860fd42	221	free(commit_reflog);
7b69b873	222	return -1;
8860fd42 JS	223	}
	224	} else
	225	commit_reflog->recno = reflogs->nr - recno - 1;
a763126b	226	commit_reflog->selector = selector;
8860fd42 JS	227	commit_reflog->reflogs = reflogs;
8860fd42 JS	228
d08565bf JK	229	ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
d08565bf JK	230	info->logs[info->nr++] = commit_reflog;
8860fd42	231
d08565bf	232	return 0;
8860fd42 JS	233	}
8860fd42 JS	234
72b103fe TR	235	void get_reflog_selector(struct strbuf *sb,
72b103fe TR	236	struct reflog_walk_info *reflog_info,
9720d23e	237	struct date_mode dmode, int force_date,
8f8f5476	238	int shorten)
72b103fe TR	239	{
	240	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	241	struct reflog_info *info;
8f8f5476	242	const char *printed_ref;
72b103fe TR	243
	244	if (!commit_reflog)
	245	return;
	246
8f8f5476 TR	247	if (shorten) {
	248	if (!commit_reflog->reflogs->short_ref)
	249	commit_reflog->reflogs->short_ref
2e5c4758 PS	250	= refs_shorten_unambiguous_ref(get_main_ref_store(the_repository),
	251	commit_reflog->reflogs->ref,
	252	0);
8f8f5476 TR	253	printed_ref = commit_reflog->reflogs->short_ref;
	254	} else {
	255	printed_ref = commit_reflog->reflogs->ref;
	256	}
	257
	258	strbuf_addf(sb, "%s@{", printed_ref);
794151e9	259	if (commit_reflog->selector == SELECTOR_DATE \|\|
55ccf85a	260	(commit_reflog->selector == SELECTOR_NONE && force_date)) {
72b103fe TR	261	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	262	strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	263	} else {
	264	strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
	265	- 2 - commit_reflog->recno);
	266	}
	267
	268	strbuf_addch(sb, '}');
	269	}
	270
8f8f5476 TR	271	void get_reflog_message(struct strbuf *sb,
	272	struct reflog_walk_info *reflog_info)
	273	{
	274	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	275	struct reflog_info *info;
	276	size_t len;
	277
	278	if (!commit_reflog)
	279	return;
	280
	281	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	282	len = strlen(info->message);
	283	if (len > 0)
	284	len--; /* strip away trailing newline */
	285	strbuf_add(sb, info->message, len);
	286	}
	287
cd1957f5 JK	288	const char get_reflog_ident(struct reflog_walk_info reflog_info)
	289	{
	290	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	291	struct reflog_info *info;
	292
	293	if (!commit_reflog)
	294	return NULL;
	295
	296	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	297	return info->email;
	298	}
	299
de239446 JK	300	timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
	301	{
	302	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	303	struct reflog_info *info;
	304
	305	if (!commit_reflog)
	306	return 0;
	307
	308	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	309	return info->timestamp;
	310	}
	311
72b103fe	312	void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
9720d23e	313	struct date_mode dmode, int force_date)
8860fd42	314	{
72b103fe TR	315	if (reflog_info && reflog_info->last_commit_reflog) {
72b103fe TR	316	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42	317	struct reflog_info *info;
72b103fe	318	struct strbuf selector = STRBUF_INIT;
8860fd42	319
4d12a471	320	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
55ccf85a	321	get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
4d12a471	322	if (oneline) {
72b103fe	323	printf("%s: %s", selector.buf, info->message);
4d12a471 JH	324	}
4d12a471 JH	325	else {
72b103fe TR	326	printf("Reflog: %s (%s)\nReflog message: %s",
72b103fe TR	327	selector.buf, info->email, info->message);
4d12a471	328	}
72b103fe TR	329
72b103fe TR	330	strbuf_release(&selector);
8860fd42 JS	331	}
8860fd42 JS	332	}
7f97de5e JK	333
	334	int reflog_walk_empty(struct reflog_walk_info *info)
	335	{
d08565bf JK	336	return !info \|\| !info->nr;
	337	}
	338
	339	static struct commit next_reflog_commit(struct commit_reflog log)
	340	{
	341	for (; log->recno >= 0; log->recno--) {
	342	struct reflog_info *entry = &log->reflogs->items[log->recno];
109cd76d SB	343	struct object *obj = parse_object(the_repository,
109cd76d SB	344	&entry->noid);
d08565bf JK	345
	346	if (obj && obj->type == OBJ_COMMIT)
	347	return (struct commit *)obj;
	348	}
	349	return NULL;
	350	}
	351
	352	static timestamp_t log_timestamp(struct commit_reflog *log)
	353	{
	354	return log->reflogs->items[log->recno].timestamp;
	355	}
	356
	357	struct commit next_reflog_entry(struct reflog_walk_info walk)
	358	{
	359	struct commit_reflog *best = NULL;
	360	struct commit *best_commit = NULL;
	361	size_t i;
	362
	363	for (i = 0; i < walk->nr; i++) {
	364	struct commit_reflog *log = walk->logs[i];
	365	struct commit *commit = next_reflog_commit(log);
	366
	367	if (!commit)
	368	continue;
	369
	370	if (!best \|\| log_timestamp(log) > log_timestamp(best)) {
	371	best = log;
	372	best_commit = commit;
	373	}
	374	}
	375
	376	if (best) {
	377	best->recno--;
	378	walk->last_commit_reflog = best;
	379	return best_commit;
	380	}
	381
	382	return NULL;
7f97de5e	383	}