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

#include "cache.h"
#include "commit.h"
#include "refs.h"
#include "diff.h"
#include "revision.h"
#include "string-list.h"
#include "reflog-walk.h"

struct complete_reflogs {
	char *ref;
	const 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);
}

static struct complete_reflogs *read_complete_reflog(const char *ref)
{
	struct complete_reflogs *reflogs =
		xcalloc(1, sizeof(struct complete_reflogs));
	reflogs->ref = xstrdup(ref);
	for_each_reflog_ent(ref, read_one_reflog, reflogs);
	if (reflogs->nr == 0) {
		const char *name;
		void *name_to_free;
		name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
						     NULL, NULL);
		if (name) {
			for_each_reflog_ent(name, read_one_reflog, reflogs);
			free(name_to_free);
		}
	}
	if (reflogs->nr == 0) {
		char *refname = xstrfmt("refs/%s", ref);
		for_each_reflog_ent(refname, read_one_reflog, reflogs);
		if (reflogs->nr == 0) {
			free(refname);
			refname = xstrfmt("refs/heads/%s", ref);
			for_each_reflog_ent(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)
{
	*info = xcalloc(1, sizeof(struct reflog_walk_info));
	(*info)->complete_reflogs.strdup_strings = 1;
}

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 = resolve_refdup("HEAD", 0, NULL, NULL);
			if (!branch)
				die("no current branch");

		}
		reflogs = read_complete_reflog(branch);
		if (!reflogs || reflogs->nr == 0) {
			struct object_id oid;
			char *b;
			int ret = dwim_log(branch, strlen(branch),
					   &oid, &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);

	commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
	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,
			 const 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
				= shorten_unambiguous_ref(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,
			 const 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
8860fd42 JS	1	#include "cache.h"
	2	#include "commit.h"
	3	#include "refs.h"
	4	#include "diff.h"
	5	#include "revision.h"
c455c87c	6	#include "string-list.h"
53645a3a	7	#include "reflog-walk.h"
8860fd42 JS	8
	9	struct complete_reflogs {
	10	char *ref;
8f8f5476	11	const char *short_ref;
8860fd42	12	struct reflog_info {
8ebc3fd0	13	struct object_id ooid, noid;
8860fd42	14	char *email;
dddbad72	15	timestamp_t timestamp;
8860fd42 JS	16	int tz;
	17	char *message;
	18	} *items;
	19	int nr, alloc;
	20	};
	21
9461d272	22	static int read_one_reflog(struct object_id ooid, struct object_id noid,
dddbad72	23	const char *email, timestamp_t timestamp, int tz,
8860fd42 JS	24	const char message, void cb_data)
	25	{
	26	struct complete_reflogs *array = cb_data;
	27	struct reflog_info *item;
	28
6647cc26	29	ALLOC_GROW(array->items, array->nr + 1, array->alloc);
8860fd42	30	item = array->items + array->nr;
9461d272	31	oidcpy(&item->ooid, ooid);
9461d272	32	oidcpy(&item->noid, noid);
8860fd42 JS	33	item->email = xstrdup(email);
	34	item->timestamp = timestamp;
	35	item->tz = tz;
	36	item->message = xstrdup(message);
	37	array->nr++;
	38	return 0;
	39	}
	40
e30d463d JK	41	static void free_complete_reflog(struct complete_reflogs *array)
	42	{
	43	int i;
	44
	45	if (!array)
	46	return;
	47
	48	for (i = 0; i < array->nr; i++) {
	49	free(array->items[i].email);
	50	free(array->items[i].message);
	51	}
	52	free(array->items);
	53	free(array->ref);
	54	free(array);
	55	}
	56
8860fd42 JS	57	static struct complete_reflogs read_complete_reflog(const char ref)
	58	{
	59	struct complete_reflogs *reflogs =
8e1aa2f7	60	xcalloc(1, sizeof(struct complete_reflogs));
8860fd42 JS	61	reflogs->ref = xstrdup(ref);
	62	for_each_reflog_ent(ref, read_one_reflog, reflogs);
	63	if (reflogs->nr == 0) {
96ec7b1e NTND	64	const char *name;
96ec7b1e NTND	65	void *name_to_free;
7695d118	66	name = name_to_free = resolve_refdup(ref, RESOLVE_REF_READING,
efbd4fdf	67	NULL, NULL);
d5a35c11	68	if (name) {
8860fd42	69	for_each_reflog_ent(name, read_one_reflog, reflogs);
96ec7b1e	70	free(name_to_free);
d5a35c11	71	}
8860fd42 JS	72	}
8860fd42 JS	73	if (reflogs->nr == 0) {
75faa45a	74	char *refname = xstrfmt("refs/%s", ref);
8860fd42 JS	75	for_each_reflog_ent(refname, read_one_reflog, reflogs);
8860fd42 JS	76	if (reflogs->nr == 0) {
75faa45a JK	77	free(refname);
75faa45a JK	78	refname = xstrfmt("refs/heads/%s", ref);
8860fd42 JS	79	for_each_reflog_ent(refname, read_one_reflog, reflogs);
	80	}
	81	free(refname);
	82	}
	83	return reflogs;
	84	}
	85
	86	static int get_reflog_recno_by_time(struct complete_reflogs *array,
dddbad72	87	timestamp_t timestamp)
8860fd42 JS	88	{
8860fd42 JS	89	int i;
40ab7c33	90	for (i = array->nr - 1; i >= 0; i--)
8860fd42 JS	91	if (timestamp >= array->items[i].timestamp)
	92	return i;
	93	return -1;
	94	}
	95
8860fd42	96	struct commit_reflog {
a763126b JK	97	int recno;
	98	enum selector_type {
	99	SELECTOR_NONE,
	100	SELECTOR_INDEX,
	101	SELECTOR_DATE
	102	} selector;
8860fd42 JS	103	struct complete_reflogs *reflogs;
	104	};
	105
	106	struct reflog_walk_info {
d08565bf JK	107	struct commit_reflog **logs;
d08565bf JK	108	size_t nr, alloc;
c455c87c	109	struct string_list complete_reflogs;
8860fd42 JS	110	struct commit_reflog *last_commit_reflog;
	111	};
	112
24d36f14	113	void init_reflog_walk(struct reflog_walk_info **info)
8860fd42	114	{
8e1aa2f7	115	*info = xcalloc(1, sizeof(struct reflog_walk_info));
75afe7ac	116	(*info)->complete_reflogs.strdup_strings = 1;
8860fd42 JS	117	}
8860fd42 JS	118
7b69b873	119	int add_reflog_for_walk(struct reflog_walk_info *info,
8860fd42 JS	120	struct commit commit, const char name)
8860fd42 JS	121	{
dddbad72	122	timestamp_t timestamp = 0;
8860fd42	123	int recno = -1;
c455c87c	124	struct string_list_item *item;
8860fd42 JS	125	struct complete_reflogs *reflogs;
	126	char branch, at = strchr(name, '@');
	127	struct commit_reflog *commit_reflog;
a763126b	128	enum selector_type selector = SELECTOR_NONE;
8860fd42	129
db055e65	130	if (commit->object.flags & UNINTERESTING)
1a07e59c	131	die("cannot walk reflogs for %s", name);
db055e65	132
8860fd42 JS	133	branch = xstrdup(name);
	134	if (at && at[1] == '{') {
	135	char *ep;
	136	branch[at - name] = '\0';
	137	recno = strtoul(at + 2, &ep, 10);
	138	if (*ep != '}') {
	139	recno = -1;
	140	timestamp = approxidate(at + 2);
a763126b	141	selector = SELECTOR_DATE;
8860fd42	142	}
a763126b JK	143	else
a763126b JK	144	selector = SELECTOR_INDEX;
8860fd42 JS	145	} else
	146	recno = 0;
	147
e8c8b713	148	item = string_list_lookup(&info->complete_reflogs, branch);
8860fd42 JS	149	if (item)
	150	reflogs = item->util;
	151	else {
d271fd53	152	if (*branch == '\0') {
d271fd53	153	free(branch);
efbd4fdf	154	branch = resolve_refdup("HEAD", 0, NULL, NULL);
96ec7b1e	155	if (!branch)
1a07e59c	156	die("no current branch");
96ec7b1e	157
d271fd53	158	}
8860fd42	159	reflogs = read_complete_reflog(branch);
eb3a4822	160	if (!reflogs \|\| reflogs->nr == 0) {
2928325f	161	struct object_id oid;
eb3a4822	162	char *b;
5026b471	163	int ret = dwim_log(branch, strlen(branch),
334dc52f	164	&oid, &b);
5026b471 JS	165	if (ret > 1)
	166	free(b);
	167	else if (ret == 1) {
e30d463d	168	free_complete_reflog(reflogs);
eb3a4822 JS	169	free(branch);
	170	branch = b;
	171	reflogs = read_complete_reflog(branch);
	172	}
	173	}
5026b471	174	if (!reflogs \|\| reflogs->nr == 0) {
e30d463d	175	free_complete_reflog(reflogs);
5026b471	176	free(branch);
7b69b873	177	return -1;
5026b471	178	}
78a395d3	179	string_list_insert(&info->complete_reflogs, branch)->util
8860fd42 JS	180	= reflogs;
8860fd42 JS	181	}
5026b471	182	free(branch);
8860fd42	183
8e1aa2f7	184	commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
8860fd42	185	if (recno < 0) {
8860fd42 JS	186	commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
8860fd42 JS	187	if (commit_reflog->recno < 0) {
8860fd42	188	free(commit_reflog);
7b69b873	189	return -1;
8860fd42 JS	190	}
	191	} else
	192	commit_reflog->recno = reflogs->nr - recno - 1;
a763126b	193	commit_reflog->selector = selector;
8860fd42 JS	194	commit_reflog->reflogs = reflogs;
8860fd42 JS	195
d08565bf JK	196	ALLOC_GROW(info->logs, info->nr + 1, info->alloc);
d08565bf JK	197	info->logs[info->nr++] = commit_reflog;
8860fd42	198
d08565bf	199	return 0;
8860fd42 JS	200	}
8860fd42 JS	201
72b103fe TR	202	void get_reflog_selector(struct strbuf *sb,
72b103fe TR	203	struct reflog_walk_info *reflog_info,
a5481a6c	204	const struct date_mode *dmode, int force_date,
8f8f5476	205	int shorten)
72b103fe TR	206	{
	207	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	208	struct reflog_info *info;
8f8f5476	209	const char *printed_ref;
72b103fe TR	210
	211	if (!commit_reflog)
	212	return;
	213
8f8f5476 TR	214	if (shorten) {
	215	if (!commit_reflog->reflogs->short_ref)
	216	commit_reflog->reflogs->short_ref
	217	= shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
	218	printed_ref = commit_reflog->reflogs->short_ref;
	219	} else {
	220	printed_ref = commit_reflog->reflogs->ref;
	221	}
	222
	223	strbuf_addf(sb, "%s@{", printed_ref);
794151e9	224	if (commit_reflog->selector == SELECTOR_DATE \|\|
55ccf85a	225	(commit_reflog->selector == SELECTOR_NONE && force_date)) {
72b103fe TR	226	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	227	strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	228	} else {
	229	strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
	230	- 2 - commit_reflog->recno);
	231	}
	232
	233	strbuf_addch(sb, '}');
	234	}
	235
8f8f5476 TR	236	void get_reflog_message(struct strbuf *sb,
	237	struct reflog_walk_info *reflog_info)
	238	{
	239	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	240	struct reflog_info *info;
	241	size_t len;
	242
	243	if (!commit_reflog)
	244	return;
	245
	246	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	247	len = strlen(info->message);
	248	if (len > 0)
	249	len--; /* strip away trailing newline */
	250	strbuf_add(sb, info->message, len);
	251	}
	252
cd1957f5 JK	253	const char get_reflog_ident(struct reflog_walk_info reflog_info)
	254	{
	255	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	256	struct reflog_info *info;
	257
	258	if (!commit_reflog)
	259	return NULL;
	260
	261	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	262	return info->email;
	263	}
	264
de239446 JK	265	timestamp_t get_reflog_timestamp(struct reflog_walk_info *reflog_info)
	266	{
	267	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	268	struct reflog_info *info;
	269
	270	if (!commit_reflog)
	271	return 0;
	272
	273	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	274	return info->timestamp;
	275	}
	276
72b103fe	277	void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
a5481a6c	278	const struct date_mode *dmode, int force_date)
8860fd42	279	{
72b103fe TR	280	if (reflog_info && reflog_info->last_commit_reflog) {
72b103fe TR	281	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42	282	struct reflog_info *info;
72b103fe	283	struct strbuf selector = STRBUF_INIT;
8860fd42	284
4d12a471	285	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
55ccf85a	286	get_reflog_selector(&selector, reflog_info, dmode, force_date, 0);
4d12a471	287	if (oneline) {
72b103fe	288	printf("%s: %s", selector.buf, info->message);
4d12a471 JH	289	}
4d12a471 JH	290	else {
72b103fe TR	291	printf("Reflog: %s (%s)\nReflog message: %s",
72b103fe TR	292	selector.buf, info->email, info->message);
4d12a471	293	}
72b103fe TR	294
72b103fe TR	295	strbuf_release(&selector);
8860fd42 JS	296	}
8860fd42 JS	297	}
7f97de5e JK	298
	299	int reflog_walk_empty(struct reflog_walk_info *info)
	300	{
d08565bf JK	301	return !info \|\| !info->nr;
	302	}
	303
	304	static struct commit next_reflog_commit(struct commit_reflog log)
	305	{
	306	for (; log->recno >= 0; log->recno--) {
	307	struct reflog_info *entry = &log->reflogs->items[log->recno];
109cd76d SB	308	struct object *obj = parse_object(the_repository,
109cd76d SB	309	&entry->noid);
d08565bf JK	310
	311	if (obj && obj->type == OBJ_COMMIT)
	312	return (struct commit *)obj;
	313	}
	314	return NULL;
	315	}
	316
	317	static timestamp_t log_timestamp(struct commit_reflog *log)
	318	{
	319	return log->reflogs->items[log->recno].timestamp;
	320	}
	321
	322	struct commit next_reflog_entry(struct reflog_walk_info walk)
	323	{
	324	struct commit_reflog *best = NULL;
	325	struct commit *best_commit = NULL;
	326	size_t i;
	327
	328	for (i = 0; i < walk->nr; i++) {
	329	struct commit_reflog *log = walk->logs[i];
	330	struct commit *commit = next_reflog_commit(log);
	331
	332	if (!commit)
	333	continue;
	334
	335	if (!best \|\| log_timestamp(log) > log_timestamp(best)) {
	336	best = log;
	337	best_commit = commit;
	338	}
	339	}
	340
	341	if (best) {
	342	best->recno--;
	343	walk->last_commit_reflog = best;
	344	return best_commit;
	345	}
	346
	347	return NULL;
7f97de5e	348	}