[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;

	if (array->nr >= array->alloc) {
		array->alloc = alloc_nr(array->nr + 1);
		array->items = xrealloc(array->items, array->alloc *
			sizeof(struct reflog_info));
	}
	item = array->items + array->nr;
	memcpy(item->osha1, osha1, 20);
	memcpy(item->nsha1, nsha1, 20);
	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(sizeof(struct complete_reflogs), 1);
	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;
	if (lifo->nr >= lifo->alloc) {
		lifo->alloc = alloc_nr(lifo->nr + 1);
		lifo->items = xrealloc(lifo->items,
			lifo->alloc * sizeof(struct commit_info));
	}
	info = lifo->items + lifo->nr;
	info->commit = commit;
	info->util = util;
	lifo->nr++;
}

struct commit_reflog {
	int flag, recno;
	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(sizeof(struct reflog_walk_info), 1);
}

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;

	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);
		}
	} 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(sizeof(struct commit_reflog), 1);
	if (recno < 0) {
		commit_reflog->flag = 1;
		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->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(sizeof(struct commit_list), 1);
	commit->parents->item = commit_info->commit;
}

void get_reflog_selector(struct strbuf *sb,
			 struct reflog_walk_info *reflog_info,
			 enum date_mode dmode,
			 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->flag || dmode) {
		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)
{
	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, 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
	29	if (array->nr >= array->alloc) {
	30	array->alloc = alloc_nr(array->nr + 1);
	31	array->items = xrealloc(array->items, array->alloc *
	32	sizeof(struct reflog_info));
	33	}
	34	item = array->items + array->nr;
	35	memcpy(item->osha1, osha1, 20);
	36	memcpy(item->nsha1, nsha1, 20);
	37	item->email = xstrdup(email);
	38	item->timestamp = timestamp;
	39	item->tz = tz;
	40	item->message = xstrdup(message);
	41	array->nr++;
	42	return 0;
	43	}
	44
	45	static struct complete_reflogs read_complete_reflog(const char ref)
	46	{
	47	struct complete_reflogs *reflogs =
	48	xcalloc(sizeof(struct complete_reflogs), 1);
	49	reflogs->ref = xstrdup(ref);
	50	for_each_reflog_ent(ref, read_one_reflog, reflogs);
	51	if (reflogs->nr == 0) {
	52	unsigned char sha1[20];
96ec7b1e NTND	53	const char *name;
	54	void *name_to_free;
	55	name = name_to_free = resolve_refdup(ref, sha1, 1, NULL);
d5a35c11	56	if (name) {
8860fd42	57	for_each_reflog_ent(name, read_one_reflog, reflogs);
96ec7b1e	58	free(name_to_free);
d5a35c11	59	}
8860fd42 JS	60	}
	61	if (reflogs->nr == 0) {
	62	int len = strlen(ref);
	63	char *refname = xmalloc(len + 12);
	64	sprintf(refname, "refs/%s", ref);
	65	for_each_reflog_ent(refname, read_one_reflog, reflogs);
	66	if (reflogs->nr == 0) {
	67	sprintf(refname, "refs/heads/%s", ref);
	68	for_each_reflog_ent(refname, read_one_reflog, reflogs);
	69	}
	70	free(refname);
	71	}
	72	return reflogs;
	73	}
	74
	75	static int get_reflog_recno_by_time(struct complete_reflogs *array,
	76	unsigned long timestamp)
	77	{
	78	int i;
40ab7c33	79	for (i = array->nr - 1; i >= 0; i--)
8860fd42 JS	80	if (timestamp >= array->items[i].timestamp)
	81	return i;
	82	return -1;
	83	}
	84
	85	struct commit_info_lifo {
	86	struct commit_info {
	87	struct commit *commit;
	88	void *util;
	89	} *items;
	90	int nr, alloc;
	91	};
	92
	93	static struct commit_info get_commit_info(struct commit commit,
	94	struct commit_info_lifo *lifo, int pop)
	95	{
	96	int i;
	97	for (i = 0; i < lifo->nr; i++)
	98	if (lifo->items[i].commit == commit) {
	99	struct commit_info *result = &lifo->items[i];
	100	if (pop) {
	101	if (i + 1 < lifo->nr)
	102	memmove(lifo->items + i,
	103	lifo->items + i + 1,
	104	(lifo->nr - i) *
	105	sizeof(struct commit_info));
	106	lifo->nr--;
	107	}
	108	return result;
	109	}
	110	return NULL;
	111	}
	112
	113	static void add_commit_info(struct commit commit, void util,
	114	struct commit_info_lifo *lifo)
	115	{
	116	struct commit_info *info;
	117	if (lifo->nr >= lifo->alloc) {
	118	lifo->alloc = alloc_nr(lifo->nr + 1);
	119	lifo->items = xrealloc(lifo->items,
	120	lifo->alloc * sizeof(struct commit_info));
	121	}
	122	info = lifo->items + lifo->nr;
	123	info->commit = commit;
	124	info->util = util;
	125	lifo->nr++;
	126	}
	127
	128	struct commit_reflog {
	129	int flag, recno;
	130	struct complete_reflogs *reflogs;
	131	};
	132
	133	struct reflog_walk_info {
	134	struct commit_info_lifo reflogs;
c455c87c	135	struct string_list complete_reflogs;
8860fd42 JS	136	struct commit_reflog *last_commit_reflog;
	137	};
	138
	139	void init_reflog_walk(struct reflog_walk_info** info)
	140	{
	141	*info = xcalloc(sizeof(struct reflog_walk_info), 1);
	142	}
	143
7b69b873	144	int add_reflog_for_walk(struct reflog_walk_info *info,
8860fd42 JS	145	struct commit commit, const char name)
	146	{
	147	unsigned long timestamp = 0;
	148	int recno = -1;
c455c87c	149	struct string_list_item *item;
8860fd42 JS	150	struct complete_reflogs *reflogs;
	151	char branch, at = strchr(name, '@');
	152	struct commit_reflog *commit_reflog;
	153
db055e65 JS	154	if (commit->object.flags & UNINTERESTING)
	155	die ("Cannot walk reflogs for %s", name);
	156
8860fd42 JS	157	branch = xstrdup(name);
	158	if (at && at[1] == '{') {
	159	char *ep;
	160	branch[at - name] = '\0';
	161	recno = strtoul(at + 2, &ep, 10);
	162	if (*ep != '}') {
	163	recno = -1;
	164	timestamp = approxidate(at + 2);
	165	}
	166	} else
	167	recno = 0;
	168
e8c8b713	169	item = string_list_lookup(&info->complete_reflogs, branch);
8860fd42 JS	170	if (item)
	171	reflogs = item->util;
	172	else {
d271fd53 JS	173	if (*branch == '\0') {
d271fd53 JS	174	unsigned char sha1[20];
d271fd53	175	free(branch);
96ec7b1e NTND	176	branch = resolve_refdup("HEAD", sha1, 0, NULL);
	177	if (!branch)
	178	die ("No current branch");
	179
d271fd53	180	}
8860fd42	181	reflogs = read_complete_reflog(branch);
eb3a4822 JS	182	if (!reflogs \|\| reflogs->nr == 0) {
	183	unsigned char sha1[20];
	184	char *b;
	185	if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
	186	if (reflogs) {
	187	free(reflogs->ref);
	188	free(reflogs);
	189	}
	190	free(branch);
	191	branch = b;
	192	reflogs = read_complete_reflog(branch);
	193	}
	194	}
8860fd42	195	if (!reflogs \|\| reflogs->nr == 0)
7b69b873	196	return -1;
78a395d3	197	string_list_insert(&info->complete_reflogs, branch)->util
8860fd42 JS	198	= reflogs;
	199	}
	200
	201	commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
	202	if (recno < 0) {
	203	commit_reflog->flag = 1;
	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;
	212	commit_reflog->reflogs = reflogs;
	213
	214	add_commit_info(commit, commit_reflog, &info->reflogs);
7b69b873	215	return 0;
8860fd42 JS	216	}
	217
	218	void fake_reflog_parent(struct reflog_walk_info info, struct commit commit)
	219	{
	220	struct commit_info *commit_info =
	221	get_commit_info(commit, &info->reflogs, 0);
	222	struct commit_reflog *commit_reflog;
	223	struct reflog_info *reflog;
	224
	225	info->last_commit_reflog = NULL;
	226	if (!commit_info)
	227	return;
	228
	229	commit_reflog = commit_info->util;
	230	if (commit_reflog->recno < 0) {
	231	commit->parents = NULL;
	232	return;
	233	}
	234
	235	reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
	236	info->last_commit_reflog = commit_reflog;
	237	commit_reflog->recno--;
	238	commit_info->commit = (struct commit *)parse_object(reflog->osha1);
	239	if (!commit_info->commit) {
	240	commit->parents = NULL;
	241	return;
	242	}
	243
	244	commit->parents = xcalloc(sizeof(struct commit_list), 1);
	245	commit->parents->item = commit_info->commit;
8860fd42 JS	246	}
8860fd42 JS	247
72b103fe TR	248	void get_reflog_selector(struct strbuf *sb,
72b103fe TR	249	struct reflog_walk_info *reflog_info,
8f8f5476 TR	250	enum date_mode dmode,
8f8f5476 TR	251	int shorten)
72b103fe TR	252	{
	253	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	254	struct reflog_info *info;
8f8f5476	255	const char *printed_ref;
72b103fe TR	256
	257	if (!commit_reflog)
	258	return;
	259
8f8f5476 TR	260	if (shorten) {
	261	if (!commit_reflog->reflogs->short_ref)
	262	commit_reflog->reflogs->short_ref
	263	= shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
	264	printed_ref = commit_reflog->reflogs->short_ref;
	265	} else {
	266	printed_ref = commit_reflog->reflogs->ref;
	267	}
	268
	269	strbuf_addf(sb, "%s@{", printed_ref);
72b103fe TR	270	if (commit_reflog->flag \|\| dmode) {
	271	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	272	strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	273	} else {
	274	strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
	275	- 2 - commit_reflog->recno);
	276	}
	277
	278	strbuf_addch(sb, '}');
	279	}
	280
8f8f5476 TR	281	void get_reflog_message(struct strbuf *sb,
	282	struct reflog_walk_info *reflog_info)
	283	{
	284	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	285	struct reflog_info *info;
	286	size_t len;
	287
	288	if (!commit_reflog)
	289	return;
	290
	291	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	292	len = strlen(info->message);
	293	if (len > 0)
	294	len--; /* strip away trailing newline */
	295	strbuf_add(sb, info->message, len);
	296	}
	297
cd1957f5 JK	298	const char get_reflog_ident(struct reflog_walk_info reflog_info)
	299	{
	300	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	301	struct reflog_info *info;
	302
	303	if (!commit_reflog)
	304	return NULL;
	305
	306	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	307	return info->email;
	308	}
	309
72b103fe	310	void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
cd437120	311	enum date_mode dmode)
8860fd42	312	{
72b103fe TR	313	if (reflog_info && reflog_info->last_commit_reflog) {
72b103fe TR	314	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42	315	struct reflog_info *info;
72b103fe	316	struct strbuf selector = STRBUF_INIT;
8860fd42	317
4d12a471	318	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
8f8f5476	319	get_reflog_selector(&selector, reflog_info, dmode, 0);
4d12a471	320	if (oneline) {
72b103fe	321	printf("%s: %s", selector.buf, info->message);
4d12a471 JH	322	}
4d12a471 JH	323	else {
72b103fe TR	324	printf("Reflog: %s (%s)\nReflog message: %s",
72b103fe TR	325	selector.buf, info->email, info->message);
4d12a471	326	}
72b103fe TR	327
72b103fe TR	328	strbuf_release(&selector);
8860fd42 JS	329	}
8860fd42 JS	330	}