[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 {
		unsigned char osha1[20], nsha1[20];
		char *email;
		unsigned long timestamp;
		int tz;
		char *message;
	} *items;
	int nr, alloc;
};

static int read_one_reflog(unsigned char *osha1, unsigned char *nsha1,
		const char *email, unsigned long 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;
	hashcpy(item->osha1, osha1);
	hashcpy(item->nsha1, nsha1);
	item->email = xstrdup(email);
	item->timestamp = timestamp;
	item->tz = tz;
	item->message = xstrdup(message);
	array->nr++;
	return 0;
}

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) {
		unsigned char sha1[20];
		const char *name;
		void *name_to_free;
		name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
		if (name) {
			for_each_reflog_ent(name, read_one_reflog, reflogs);
			free(name_to_free);
		}
	}
	if (reflogs->nr == 0) {
		int len = strlen(ref);
		char *refname = xmalloc(len + 12);
		sprintf(refname, "refs/%s", ref);
		for_each_reflog_ent(refname, read_one_reflog, reflogs);
		if (reflogs->nr == 0) {
			sprintf(refname, "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,
	unsigned long timestamp)
{
	int i;
	for (i = array->nr - 1; i >= 0; i--)
		if (timestamp >= array->items[i].timestamp)
			return i;
	return -1;
}

struct commit_info_lifo {
	struct commit_info {
		struct commit *commit;
		void *util;
	} *items;
	int nr, alloc;
};

static struct commit_info *get_commit_info(struct commit *commit,
		struct commit_info_lifo *lifo, int pop)
{
	int i;
	for (i = 0; i < lifo->nr; i++)
		if (lifo->items[i].commit == commit) {
			struct commit_info *result = &lifo->items[i];
			if (pop) {
				if (i + 1 < lifo->nr)
					memmove(lifo->items + i,
						lifo->items + i + 1,
						(lifo->nr - i) *
						sizeof(struct commit_info));
				lifo->nr--;
			}
			return result;
		}
	return NULL;
}

static void add_commit_info(struct commit *commit, void *util,
		struct commit_info_lifo *lifo)
{
	struct commit_info *info;
	ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
	info = lifo->items + lifo->nr;
	info->commit = commit;
	info->util = util;
	lifo->nr++;
}

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_info_lifo reflogs;
	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));
}

int add_reflog_for_walk(struct reflog_walk_info *info,
		struct commit *commit, const char *name)
{
	unsigned long 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') {
			unsigned char sha1[20];
			free(branch);
			branch = resolve_refdup("HEAD", sha1, 0, NULL);
			if (!branch)
				die ("No current branch");

		}
		reflogs = read_complete_reflog(branch);
		if (!reflogs || reflogs->nr == 0) {
			unsigned char sha1[20];
			char *b;
			if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
				if (reflogs) {
					free(reflogs->ref);
					free(reflogs);
				}
				free(branch);
				branch = b;
				reflogs = read_complete_reflog(branch);
			}
		}
		if (!reflogs || reflogs->nr == 0)
			return -1;
		string_list_insert(&info->complete_reflogs, branch)->util
			= reflogs;
	}

	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(branch);
			free(commit_reflog);
			return -1;
		}
	} else
		commit_reflog->recno = reflogs->nr - recno - 1;
	commit_reflog->selector = selector;
	commit_reflog->reflogs = reflogs;

	add_commit_info(commit, commit_reflog, &info->reflogs);
	return 0;
}

void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
{
	struct commit_info *commit_info =
		get_commit_info(commit, &info->reflogs, 0);
	struct commit_reflog *commit_reflog;
	struct reflog_info *reflog;

	info->last_commit_reflog = NULL;
	if (!commit_info)
		return;

	commit_reflog = commit_info->util;
	if (commit_reflog->recno < 0) {
		commit->parents = NULL;
		return;
	}

	reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
	info->last_commit_reflog = commit_reflog;
	commit_reflog->recno--;
	commit_info->commit = (struct commit *)parse_object(reflog->osha1);
	if (!commit_info->commit) {
		commit->parents = NULL;
		return;
	}

	commit->parents = xcalloc(1, sizeof(struct commit_list));
	commit->parents->item = commit_info->commit;
}

void get_reflog_selector(struct strbuf *sb,
			 struct reflog_walk_info *reflog_info,
			 enum 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;
}

void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
			 enum 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);
	}
}
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 JS	12	struct reflog_info {
	13	unsigned char osha1[20], nsha1[20];
	14	char *email;
	15	unsigned long timestamp;
	16	int tz;
	17	char *message;
	18	} *items;
	19	int nr, alloc;
	20	};
	21
	22	static int read_one_reflog(unsigned char osha1, unsigned char nsha1,
	23	const char *email, unsigned long timestamp, int tz,
	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;
50546b15 SH	31	hashcpy(item->osha1, osha1);
50546b15 SH	32	hashcpy(item->nsha1, nsha1);
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
	41	static struct complete_reflogs read_complete_reflog(const char ref)
	42	{
	43	struct complete_reflogs *reflogs =
8e1aa2f7	44	xcalloc(1, sizeof(struct complete_reflogs));
8860fd42 JS	45	reflogs->ref = xstrdup(ref);
	46	for_each_reflog_ent(ref, read_one_reflog, reflogs);
	47	if (reflogs->nr == 0) {
	48	unsigned char sha1[20];
96ec7b1e NTND	49	const char *name;
	50	void *name_to_free;
	51	name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
d5a35c11	52	if (name) {
8860fd42	53	for_each_reflog_ent(name, read_one_reflog, reflogs);
96ec7b1e	54	free(name_to_free);
d5a35c11	55	}
8860fd42 JS	56	}
	57	if (reflogs->nr == 0) {
	58	int len = strlen(ref);
	59	char *refname = xmalloc(len + 12);
	60	sprintf(refname, "refs/%s", ref);
	61	for_each_reflog_ent(refname, read_one_reflog, reflogs);
	62	if (reflogs->nr == 0) {
	63	sprintf(refname, "refs/heads/%s", ref);
	64	for_each_reflog_ent(refname, read_one_reflog, reflogs);
	65	}
	66	free(refname);
	67	}
	68	return reflogs;
	69	}
	70
	71	static int get_reflog_recno_by_time(struct complete_reflogs *array,
	72	unsigned long timestamp)
	73	{
	74	int i;
40ab7c33	75	for (i = array->nr - 1; i >= 0; i--)
8860fd42 JS	76	if (timestamp >= array->items[i].timestamp)
	77	return i;
	78	return -1;
	79	}
	80
	81	struct commit_info_lifo {
	82	struct commit_info {
	83	struct commit *commit;
	84	void *util;
	85	} *items;
	86	int nr, alloc;
	87	};
	88
	89	static struct commit_info get_commit_info(struct commit commit,
	90	struct commit_info_lifo *lifo, int pop)
	91	{
	92	int i;
	93	for (i = 0; i < lifo->nr; i++)
	94	if (lifo->items[i].commit == commit) {
	95	struct commit_info *result = &lifo->items[i];
	96	if (pop) {
	97	if (i + 1 < lifo->nr)
	98	memmove(lifo->items + i,
	99	lifo->items + i + 1,
	100	(lifo->nr - i) *
	101	sizeof(struct commit_info));
	102	lifo->nr--;
	103	}
	104	return result;
	105	}
	106	return NULL;
	107	}
	108
	109	static void add_commit_info(struct commit commit, void util,
	110	struct commit_info_lifo *lifo)
	111	{
	112	struct commit_info *info;
6647cc26	113	ALLOC_GROW(lifo->items, lifo->nr + 1, lifo->alloc);
8860fd42 JS	114	info = lifo->items + lifo->nr;
	115	info->commit = commit;
	116	info->util = util;
	117	lifo->nr++;
	118	}
	119
	120	struct commit_reflog {
a763126b JK	121	int recno;
	122	enum selector_type {
	123	SELECTOR_NONE,
	124	SELECTOR_INDEX,
	125	SELECTOR_DATE
	126	} selector;
8860fd42 JS	127	struct complete_reflogs *reflogs;
	128	};
	129
	130	struct reflog_walk_info {
	131	struct commit_info_lifo reflogs;
c455c87c	132	struct string_list complete_reflogs;
8860fd42 JS	133	struct commit_reflog *last_commit_reflog;
	134	};
	135
	136	void init_reflog_walk(struct reflog_walk_info** info)
	137	{
8e1aa2f7	138	*info = xcalloc(1, sizeof(struct reflog_walk_info));
8860fd42 JS	139	}
8860fd42 JS	140
7b69b873	141	int add_reflog_for_walk(struct reflog_walk_info *info,
8860fd42 JS	142	struct commit commit, const char name)
	143	{
	144	unsigned long timestamp = 0;
	145	int recno = -1;
c455c87c	146	struct string_list_item *item;
8860fd42 JS	147	struct complete_reflogs *reflogs;
	148	char branch, at = strchr(name, '@');
	149	struct commit_reflog *commit_reflog;
a763126b	150	enum selector_type selector = SELECTOR_NONE;
8860fd42	151
db055e65 JS	152	if (commit->object.flags & UNINTERESTING)
	153	die ("Cannot walk reflogs for %s", name);
	154
8860fd42 JS	155	branch = xstrdup(name);
	156	if (at && at[1] == '{') {
	157	char *ep;
	158	branch[at - name] = '\0';
	159	recno = strtoul(at + 2, &ep, 10);
	160	if (*ep != '}') {
	161	recno = -1;
	162	timestamp = approxidate(at + 2);
a763126b	163	selector = SELECTOR_DATE;
8860fd42	164	}
a763126b JK	165	else
a763126b JK	166	selector = SELECTOR_INDEX;
8860fd42 JS	167	} else
	168	recno = 0;
	169
e8c8b713	170	item = string_list_lookup(&info->complete_reflogs, branch);
8860fd42 JS	171	if (item)
	172	reflogs = item->util;
	173	else {
d271fd53 JS	174	if (*branch == '\0') {
d271fd53 JS	175	unsigned char sha1[20];
d271fd53	176	free(branch);
96ec7b1e NTND	177	branch = resolve_refdup("HEAD", sha1, 0, NULL);
	178	if (!branch)
	179	die ("No current branch");
	180
d271fd53	181	}
8860fd42	182	reflogs = read_complete_reflog(branch);
eb3a4822 JS	183	if (!reflogs \|\| reflogs->nr == 0) {
	184	unsigned char sha1[20];
	185	char *b;
	186	if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
	187	if (reflogs) {
	188	free(reflogs->ref);
	189	free(reflogs);
	190	}
	191	free(branch);
	192	branch = b;
	193	reflogs = read_complete_reflog(branch);
	194	}
	195	}
8860fd42	196	if (!reflogs \|\| reflogs->nr == 0)
7b69b873	197	return -1;
78a395d3	198	string_list_insert(&info->complete_reflogs, branch)->util
8860fd42 JS	199	= reflogs;
	200	}
	201
8e1aa2f7	202	commit_reflog = xcalloc(1, sizeof(struct commit_reflog));
8860fd42	203	if (recno < 0) {
8860fd42 JS	204	commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
	205	if (commit_reflog->recno < 0) {
	206	free(branch);
	207	free(commit_reflog);
7b69b873	208	return -1;
8860fd42 JS	209	}
	210	} else
	211	commit_reflog->recno = reflogs->nr - recno - 1;
a763126b	212	commit_reflog->selector = selector;
8860fd42 JS	213	commit_reflog->reflogs = reflogs;
	214
	215	add_commit_info(commit, commit_reflog, &info->reflogs);
7b69b873	216	return 0;
8860fd42 JS	217	}
	218
	219	void fake_reflog_parent(struct reflog_walk_info info, struct commit commit)
	220	{
	221	struct commit_info *commit_info =
	222	get_commit_info(commit, &info->reflogs, 0);
	223	struct commit_reflog *commit_reflog;
	224	struct reflog_info *reflog;
	225
	226	info->last_commit_reflog = NULL;
	227	if (!commit_info)
	228	return;
	229
	230	commit_reflog = commit_info->util;
	231	if (commit_reflog->recno < 0) {
	232	commit->parents = NULL;
	233	return;
	234	}
	235
	236	reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
	237	info->last_commit_reflog = commit_reflog;
	238	commit_reflog->recno--;
	239	commit_info->commit = (struct commit *)parse_object(reflog->osha1);
	240	if (!commit_info->commit) {
	241	commit->parents = NULL;
	242	return;
	243	}
	244
8e1aa2f7	245	commit->parents = xcalloc(1, sizeof(struct commit_list));
8860fd42	246	commit->parents->item = commit_info->commit;
8860fd42 JS	247	}
8860fd42 JS	248
72b103fe TR	249	void get_reflog_selector(struct strbuf *sb,
72b103fe TR	250	struct reflog_walk_info *reflog_info,
55ccf85a	251	enum date_mode dmode, int force_date,
8f8f5476	252	int shorten)
72b103fe TR	253	{
	254	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	255	struct reflog_info *info;
8f8f5476	256	const char *printed_ref;
72b103fe TR	257
	258	if (!commit_reflog)
	259	return;
	260
8f8f5476 TR	261	if (shorten) {
	262	if (!commit_reflog->reflogs->short_ref)
	263	commit_reflog->reflogs->short_ref
	264	= shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
	265	printed_ref = commit_reflog->reflogs->short_ref;
	266	} else {
	267	printed_ref = commit_reflog->reflogs->ref;
	268	}
	269
	270	strbuf_addf(sb, "%s@{", printed_ref);
794151e9	271	if (commit_reflog->selector == SELECTOR_DATE \|\|
55ccf85a	272	(commit_reflog->selector == SELECTOR_NONE && force_date)) {
72b103fe TR	273	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	274	strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	275	} else {
	276	strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
	277	- 2 - commit_reflog->recno);
	278	}
	279
	280	strbuf_addch(sb, '}');
	281	}
	282
8f8f5476 TR	283	void get_reflog_message(struct strbuf *sb,
	284	struct reflog_walk_info *reflog_info)
	285	{
	286	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	287	struct reflog_info *info;
	288	size_t len;
	289
	290	if (!commit_reflog)
	291	return;
	292
	293	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	294	len = strlen(info->message);
	295	if (len > 0)
	296	len--; /* strip away trailing newline */
	297	strbuf_add(sb, info->message, len);
	298	}
	299
cd1957f5 JK	300	const char get_reflog_ident(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 NULL;
	307
	308	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	309	return info->email;
	310	}
	311
72b103fe	312	void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
55ccf85a	313	enum 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	}