[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 = resolve_ref(ref, sha1, 1, NULL);
		if (name)
			for_each_reflog_ent(name, read_one_reflog, reflogs);
	}
	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];
			const char *head = resolve_ref("HEAD", sha1, 0, NULL);
			if (!head)
				die ("No current branch");
			free(branch);
			branch = xstrdup(head);
		}
		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);
}

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];
	53	const char *name = resolve_ref(ref, sha1, 1, NULL);
	54	if (name)
	55	for_each_reflog_ent(name, read_one_reflog, reflogs);
	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;
	113	if (lifo->nr >= lifo->alloc) {
	114	lifo->alloc = alloc_nr(lifo->nr + 1);
	115	lifo->items = xrealloc(lifo->items,
	116	lifo->alloc * sizeof(struct commit_info));
	117	}
	118	info = lifo->items + lifo->nr;
	119	info->commit = commit;
	120	info->util = util;
	121	lifo->nr++;
	122	}
	123
	124	struct commit_reflog {
	125	int flag, recno;
	126	struct complete_reflogs *reflogs;
	127	};
	128
	129	struct reflog_walk_info {
	130	struct commit_info_lifo reflogs;
c455c87c	131	struct string_list complete_reflogs;
8860fd42 JS	132	struct commit_reflog *last_commit_reflog;
	133	};
	134
	135	void init_reflog_walk(struct reflog_walk_info** info)
	136	{
	137	*info = xcalloc(sizeof(struct reflog_walk_info), 1);
	138	}
	139
7b69b873	140	int add_reflog_for_walk(struct reflog_walk_info *info,
8860fd42 JS	141	struct commit commit, const char name)
	142	{
	143	unsigned long timestamp = 0;
	144	int recno = -1;
c455c87c	145	struct string_list_item *item;
8860fd42 JS	146	struct complete_reflogs *reflogs;
	147	char branch, at = strchr(name, '@');
	148	struct commit_reflog *commit_reflog;
	149
db055e65 JS	150	if (commit->object.flags & UNINTERESTING)
	151	die ("Cannot walk reflogs for %s", name);
	152
8860fd42 JS	153	branch = xstrdup(name);
	154	if (at && at[1] == '{') {
	155	char *ep;
	156	branch[at - name] = '\0';
	157	recno = strtoul(at + 2, &ep, 10);
	158	if (*ep != '}') {
	159	recno = -1;
	160	timestamp = approxidate(at + 2);
	161	}
	162	} else
	163	recno = 0;
	164
e8c8b713	165	item = string_list_lookup(&info->complete_reflogs, branch);
8860fd42 JS	166	if (item)
	167	reflogs = item->util;
	168	else {
d271fd53 JS	169	if (*branch == '\0') {
	170	unsigned char sha1[20];
	171	const char *head = resolve_ref("HEAD", sha1, 0, NULL);
	172	if (!head)
	173	die ("No current branch");
	174	free(branch);
	175	branch = xstrdup(head);
	176	}
8860fd42	177	reflogs = read_complete_reflog(branch);
eb3a4822 JS	178	if (!reflogs \|\| reflogs->nr == 0) {
	179	unsigned char sha1[20];
	180	char *b;
	181	if (dwim_log(branch, strlen(branch), sha1, &b) == 1) {
	182	if (reflogs) {
	183	free(reflogs->ref);
	184	free(reflogs);
	185	}
	186	free(branch);
	187	branch = b;
	188	reflogs = read_complete_reflog(branch);
	189	}
	190	}
8860fd42	191	if (!reflogs \|\| reflogs->nr == 0)
7b69b873	192	return -1;
78a395d3	193	string_list_insert(&info->complete_reflogs, branch)->util
8860fd42 JS	194	= reflogs;
	195	}
	196
	197	commit_reflog = xcalloc(sizeof(struct commit_reflog), 1);
	198	if (recno < 0) {
	199	commit_reflog->flag = 1;
	200	commit_reflog->recno = get_reflog_recno_by_time(reflogs, timestamp);
	201	if (commit_reflog->recno < 0) {
	202	free(branch);
	203	free(commit_reflog);
7b69b873	204	return -1;
8860fd42 JS	205	}
	206	} else
	207	commit_reflog->recno = reflogs->nr - recno - 1;
	208	commit_reflog->reflogs = reflogs;
	209
	210	add_commit_info(commit, commit_reflog, &info->reflogs);
7b69b873	211	return 0;
8860fd42 JS	212	}
	213
	214	void fake_reflog_parent(struct reflog_walk_info info, struct commit commit)
	215	{
	216	struct commit_info *commit_info =
	217	get_commit_info(commit, &info->reflogs, 0);
	218	struct commit_reflog *commit_reflog;
	219	struct reflog_info *reflog;
	220
	221	info->last_commit_reflog = NULL;
	222	if (!commit_info)
	223	return;
	224
	225	commit_reflog = commit_info->util;
	226	if (commit_reflog->recno < 0) {
	227	commit->parents = NULL;
	228	return;
	229	}
	230
	231	reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
	232	info->last_commit_reflog = commit_reflog;
	233	commit_reflog->recno--;
	234	commit_info->commit = (struct commit *)parse_object(reflog->osha1);
	235	if (!commit_info->commit) {
	236	commit->parents = NULL;
	237	return;
	238	}
	239
	240	commit->parents = xcalloc(sizeof(struct commit_list), 1);
	241	commit->parents->item = commit_info->commit;
8860fd42 JS	242	}
8860fd42 JS	243
72b103fe TR	244	void get_reflog_selector(struct strbuf *sb,
72b103fe TR	245	struct reflog_walk_info *reflog_info,
8f8f5476 TR	246	enum date_mode dmode,
8f8f5476 TR	247	int shorten)
72b103fe TR	248	{
	249	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	250	struct reflog_info *info;
8f8f5476	251	const char *printed_ref;
72b103fe TR	252
	253	if (!commit_reflog)
	254	return;
	255
8f8f5476 TR	256	if (shorten) {
	257	if (!commit_reflog->reflogs->short_ref)
	258	commit_reflog->reflogs->short_ref
	259	= shorten_unambiguous_ref(commit_reflog->reflogs->ref, 0);
	260	printed_ref = commit_reflog->reflogs->short_ref;
	261	} else {
	262	printed_ref = commit_reflog->reflogs->ref;
	263	}
	264
	265	strbuf_addf(sb, "%s@{", printed_ref);
72b103fe TR	266	if (commit_reflog->flag \|\| dmode) {
	267	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	268	strbuf_addstr(sb, show_date(info->timestamp, info->tz, dmode));
	269	} else {
	270	strbuf_addf(sb, "%d", commit_reflog->reflogs->nr
	271	- 2 - commit_reflog->recno);
	272	}
	273
	274	strbuf_addch(sb, '}');
	275	}
	276
8f8f5476 TR	277	void get_reflog_message(struct strbuf *sb,
	278	struct reflog_walk_info *reflog_info)
	279	{
	280	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
	281	struct reflog_info *info;
	282	size_t len;
	283
	284	if (!commit_reflog)
	285	return;
	286
	287	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
	288	len = strlen(info->message);
	289	if (len > 0)
	290	len--; /* strip away trailing newline */
	291	strbuf_add(sb, info->message, len);
	292	}
	293
72b103fe	294	void show_reflog_message(struct reflog_walk_info *reflog_info, int oneline,
cd437120	295	enum date_mode dmode)
8860fd42	296	{
72b103fe TR	297	if (reflog_info && reflog_info->last_commit_reflog) {
72b103fe TR	298	struct commit_reflog *commit_reflog = reflog_info->last_commit_reflog;
8860fd42	299	struct reflog_info *info;
72b103fe	300	struct strbuf selector = STRBUF_INIT;
8860fd42	301
4d12a471	302	info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
8f8f5476	303	get_reflog_selector(&selector, reflog_info, dmode, 0);
4d12a471	304	if (oneline) {
72b103fe	305	printf("%s: %s", selector.buf, info->message);
4d12a471 JH	306	}
4d12a471 JH	307	else {
72b103fe TR	308	printf("Reflog: %s (%s)\nReflog message: %s",
72b103fe TR	309	selector.buf, info->email, info->message);
4d12a471	310	}
72b103fe TR	311
72b103fe TR	312	strbuf_release(&selector);
8860fd42 JS	313	}
8860fd42 JS	314	}