[thirdparty/git.git] / builtin / name-rev.c

#include "builtin.h"
#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "parse-options.h"

#define CUTOFF_DATE_SLOP 86400 /* one day */

typedef struct rev_name {
	const char *tip_name;
	int generation;
	int distance;
} rev_name;

static long cutoff = LONG_MAX;

/* How many generations are maximally preferred over _one_ merge traversal? */
#define MERGE_TRAVERSAL_WEIGHT 65535

static void name_rev(struct commit *commit,
		const char *tip_name, int generation, int distance,
		int deref)
{
	struct rev_name *name = (struct rev_name *)commit->util;
	struct commit_list *parents;
	int parent_number = 1;

	if (!commit->object.parsed)
		parse_commit(commit);

	if (commit->date < cutoff)
		return;

	if (deref) {
		char *new_name = xmalloc(strlen(tip_name)+3);
		strcpy(new_name, tip_name);
		strcat(new_name, "^0");
		tip_name = new_name;

		if (generation)
			die("generation: %d, but deref?", generation);
	}

	if (name == NULL) {
		name = xmalloc(sizeof(rev_name));
		commit->util = name;
		goto copy_data;
	} else if (name->distance > distance) {
copy_data:
		name->tip_name = tip_name;
		name->generation = generation;
		name->distance = distance;
	} else
		return;

	for (parents = commit->parents;
			parents;
			parents = parents->next, parent_number++) {
		if (parent_number > 1) {
			int len = strlen(tip_name);
			char *new_name = xmalloc(len +
				1 + decimal_length(generation) +  /* ~<n> */
				1 + 2 +				  /* ^NN */
				1);

			if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
				len -= 2;
			if (generation > 0)
				sprintf(new_name, "%.*s~%d^%d", len, tip_name,
						generation, parent_number);
			else
				sprintf(new_name, "%.*s^%d", len, tip_name,
						parent_number);

			name_rev(parents->item, new_name, 0,
				distance + MERGE_TRAVERSAL_WEIGHT, 0);
		} else {
			name_rev(parents->item, tip_name, generation + 1,
				distance + 1, 0);
		}
	}
}

static int subpath_matches(const char *path, const char *filter)
{
	const char *subpath = path;

	while (subpath) {
		if (!fnmatch(filter, subpath, 0))
			return subpath - path;
		subpath = strchr(subpath, '/');
		if (subpath)
			subpath++;
	}
	return -1;
}

static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
{
	if (shorten_unambiguous)
		refname = shorten_unambiguous_ref(refname, 0);
	else if (!prefixcmp(refname, "refs/heads/"))
		refname = refname + 11;
	else if (!prefixcmp(refname, "refs/"))
		refname = refname + 5;
	return refname;
}

struct name_ref_data {
	int tags_only;
	int name_only;
	const char *ref_filter;
};

static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
{
	struct object *o = parse_object(sha1);
	struct name_ref_data *data = cb_data;
	int can_abbreviate_output = data->tags_only && data->name_only;
	int deref = 0;

	if (data->tags_only && prefixcmp(path, "refs/tags/"))
		return 0;

	if (data->ref_filter) {
		switch (subpath_matches(path, data->ref_filter)) {
		case -1: /* did not match */
			return 0;
		case 0:  /* matched fully */
			break;
		default: /* matched subpath */
			can_abbreviate_output = 1;
			break;
		}
	}

	while (o && o->type == OBJ_TAG) {
		struct tag *t = (struct tag *) o;
		if (!t->tagged)
			break; /* broken repository */
		o = parse_object(t->tagged->sha1);
		deref = 1;
	}
	if (o && o->type == OBJ_COMMIT) {
		struct commit *commit = (struct commit *)o;

		path = name_ref_abbrev(path, can_abbreviate_output);
		name_rev(commit, xstrdup(path), 0, 0, deref);
	}
	return 0;
}

/* returns a static buffer */
static const char *get_rev_name(const struct object *o)
{
	static char buffer[1024];
	struct rev_name *n;
	struct commit *c;

	if (o->type != OBJ_COMMIT)
		return NULL;
	c = (struct commit *) o;
	n = c->util;
	if (!n)
		return NULL;

	if (!n->generation)
		return n->tip_name;
	else {
		int len = strlen(n->tip_name);
		if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
			len -= 2;
		snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
				n->generation);

		return buffer;
	}
}

static void show_name(const struct object *obj,
		      const char *caller_name,
		      int always, int allow_undefined, int name_only)
{
	const char *name;
	const unsigned char *sha1 = obj->sha1;

	if (!name_only)
		printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
	name = get_rev_name(obj);
	if (name)
		printf("%s\n", name);
	else if (allow_undefined)
		printf("undefined\n");
	else if (always)
		printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
	else
		die("cannot describe '%s'", sha1_to_hex(sha1));
}

static char const * const name_rev_usage[] = {
	N_("git name-rev [options] <commit>..."),
	N_("git name-rev [options] --all"),
	N_("git name-rev [options] --stdin"),
	NULL
};

static void name_rev_line(char *p, struct name_ref_data *data)
{
	int forty = 0;
	char *p_start;
	for (p_start = p; *p; p++) {
#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
		if (!ishex(*p))
			forty = 0;
		else if (++forty == 40 &&
			 !ishex(*(p+1))) {
			unsigned char sha1[40];
			const char *name = NULL;
			char c = *(p+1);
			int p_len = p - p_start + 1;

			forty = 0;

			*(p+1) = 0;
			if (!get_sha1(p - 39, sha1)) {
				struct object *o =
					lookup_object(sha1);
				if (o)
					name = get_rev_name(o);
			}
			*(p+1) = c;

			if (!name)
				continue;

			if (data->name_only)
				printf("%.*s%s", p_len - 40, p_start, name);
			else
				printf("%.*s (%s)", p_len, p_start, name);
			p_start = p + 1;
		}
	}

	/* flush */
	if (p_start != p)
		fwrite(p_start, p - p_start, 1, stdout);
}

int cmd_name_rev(int argc, const char **argv, const char *prefix)
{
	struct object_array revs = OBJECT_ARRAY_INIT;
	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
	struct name_ref_data data = { 0, 0, NULL };
	struct option opts[] = {
		OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
		OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
		OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
				   N_("only use refs matching <pattern>")),
		OPT_GROUP(""),
		OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
		OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
		OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
		OPT_BOOLEAN(0, "always",     &always,
			   N_("show abbreviated commit object as fallback")),
		OPT_END(),
	};

	git_config(git_default_config, NULL);
	argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
	if (!!all + !!transform_stdin + !!argc > 1) {
		error("Specify either a list, or --all, not both!");
		usage_with_options(name_rev_usage, opts);
	}
	if (all || transform_stdin)
		cutoff = 0;

	for (; argc; argc--, argv++) {
		unsigned char sha1[20];
		struct object *o;
		struct commit *commit;

		if (get_sha1(*argv, sha1)) {
			fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
					*argv);
			continue;
		}

		o = deref_tag(parse_object(sha1), *argv, 0);
		if (!o || o->type != OBJ_COMMIT) {
			fprintf(stderr, "Could not get commit for %s. Skipping.\n",
					*argv);
			continue;
		}

		commit = (struct commit *)o;
		if (cutoff > commit->date)
			cutoff = commit->date;
		add_object_array((struct object *)commit, *argv, &revs);
	}

	if (cutoff)
		cutoff = cutoff - CUTOFF_DATE_SLOP;
	for_each_ref(name_ref, &data);

	if (transform_stdin) {
		char buffer[2048];

		while (!feof(stdin)) {
			char *p = fgets(buffer, sizeof(buffer), stdin);
			if (!p)
				break;
			name_rev_line(p, &data);
		}
	} else if (all) {
		int i, max;

		max = get_max_object_index();
		for (i = 0; i < max; i++) {
			struct object *obj = get_indexed_object(i);
			if (!obj || obj->type != OBJ_COMMIT)
				continue;
			show_name(obj, NULL,
				  always, allow_undefined, data.name_only);
		}
	} else {
		int i;
		for (i = 0; i < revs.nr; i++)
			show_name(revs.objects[i].item, revs.objects[i].name,
				  always, allow_undefined, data.name_only);
	}

	return 0;
}
Commit	Line	Data
d6b64ed0	1	#include "builtin.h"
bd321bcc JS	2	#include "cache.h"
	3	#include "commit.h"
	4	#include "tag.h"
	5	#include "refs.h"
edefb1a2	6	#include "parse-options.h"
bd321bcc	7
c075aea5 JH	8	#define CUTOFF_DATE_SLOP 86400 /* one day */
c075aea5 JH	9
bd321bcc JS	10	typedef struct rev_name {
bd321bcc JS	11	const char *tip_name;
bd321bcc	12	int generation;
ac076c29	13	int distance;
bd321bcc JS	14	} rev_name;
	15
	16	static long cutoff = LONG_MAX;
	17
ac076c29 JS	18	/* How many generations are maximally preferred over _one_ merge traversal? */
	19	#define MERGE_TRAVERSAL_WEIGHT 65535
	20
bd321bcc	21	static void name_rev(struct commit *commit,
ac076c29	22	const char *tip_name, int generation, int distance,
bd321bcc JS	23	int deref)
bd321bcc JS	24	{
d3ff6f55	25	struct rev_name name = (struct rev_name )commit->util;
bd321bcc	26	struct commit_list *parents;
f2e6f1c9	27	int parent_number = 1;
bd321bcc JS	28
	29	if (!commit->object.parsed)
	30	parse_commit(commit);
	31
	32	if (commit->date < cutoff)
	33	return;
	34
	35	if (deref) {
	36	char *new_name = xmalloc(strlen(tip_name)+3);
	37	strcpy(new_name, tip_name);
	38	strcat(new_name, "^0");
	39	tip_name = new_name;
	40
	41	if (generation)
	42	die("generation: %d, but deref?", generation);
	43	}
	44
	45	if (name == NULL) {
	46	name = xmalloc(sizeof(rev_name));
d3ff6f55	47	commit->util = name;
bd321bcc	48	goto copy_data;
ac076c29	49	} else if (name->distance > distance) {
bd321bcc JS	50	copy_data:
bd321bcc JS	51	name->tip_name = tip_name;
bd321bcc	52	name->generation = generation;
ac076c29	53	name->distance = distance;
bd321bcc JS	54	} else
	55	return;
	56
	57	for (parents = commit->parents;
	58	parents;
	59	parents = parents->next, parent_number++) {
f2e6f1c9	60	if (parent_number > 1) {
59d3f541	61	int len = strlen(tip_name);
cf606e3d AW	62	char *new_name = xmalloc(len +
	63	1 + decimal_length(generation) + /* ~<n> */
	64	1 + 2 + /* ^NN */
	65	1);
bd321bcc	66
59d3f541 JS	67	if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
59d3f541 JS	68	len -= 2;
bd321bcc	69	if (generation > 0)
59d3f541	70	sprintf(new_name, "%.*s~%d^%d", len, tip_name,
bd321bcc JS	71	generation, parent_number);
bd321bcc JS	72	else
59d3f541 JS	73	sprintf(new_name, "%.*s^%d", len, tip_name,
59d3f541 JS	74	parent_number);
bd321bcc	75
ac076c29 JS	76	name_rev(parents->item, new_name, 0,
ac076c29 JS	77	distance + MERGE_TRAVERSAL_WEIGHT, 0);
bd321bcc	78	} else {
ac076c29 JS	79	name_rev(parents->item, tip_name, generation + 1,
ac076c29 JS	80	distance + 1, 0);
bd321bcc JS	81	}
	82	}
	83	}
	84
98c5c4ad NK	85	static int subpath_matches(const char path, const char filter)
	86	{
	87	const char *subpath = path;
	88
	89	while (subpath) {
	90	if (!fnmatch(filter, subpath, 0))
	91	return subpath - path;
	92	subpath = strchr(subpath, '/');
	93	if (subpath)
	94	subpath++;
	95	}
	96	return -1;
	97	}
	98
9608a190 JH	99	static const char name_ref_abbrev(const char refname, int shorten_unambiguous)
	100	{
	101	if (shorten_unambiguous)
	102	refname = shorten_unambiguous_ref(refname, 0);
	103	else if (!prefixcmp(refname, "refs/heads/"))
	104	refname = refname + 11;
	105	else if (!prefixcmp(refname, "refs/"))
	106	refname = refname + 5;
	107	return refname;
	108	}
	109
2afc29aa JS	110	struct name_ref_data {
2afc29aa JS	111	int tags_only;
23615708	112	int name_only;
2afc29aa JS	113	const char *ref_filter;
	114	};
	115
8da19775	116	static int name_ref(const char path, const unsigned char sha1, int flags, void *cb_data)
bd321bcc JS	117	{
bd321bcc JS	118	struct object *o = parse_object(sha1);
2afc29aa	119	struct name_ref_data *data = cb_data;
98c5c4ad	120	int can_abbreviate_output = data->tags_only && data->name_only;
bd321bcc JS	121	int deref = 0;
bd321bcc JS	122
cc44c765	123	if (data->tags_only && prefixcmp(path, "refs/tags/"))
2afc29aa JS	124	return 0;
2afc29aa JS	125
98c5c4ad NK	126	if (data->ref_filter) {
	127	switch (subpath_matches(path, data->ref_filter)) {
	128	case -1: /* did not match */
	129	return 0;
	130	case 0: /* matched fully */
	131	break;
	132	default: /* matched subpath */
	133	can_abbreviate_output = 1;
	134	break;
	135	}
	136	}
bd321bcc	137
1974632c	138	while (o && o->type == OBJ_TAG) {
bd321bcc JS	139	struct tag t = (struct tag ) o;
	140	if (!t->tagged)
	141	break; /* broken repository */
	142	o = parse_object(t->tagged->sha1);
	143	deref = 1;
	144	}
1974632c	145	if (o && o->type == OBJ_COMMIT) {
bd321bcc	146	struct commit commit = (struct commit )o;
bd321bcc	147
9608a190	148	path = name_ref_abbrev(path, can_abbreviate_output);
9befac47	149	name_rev(commit, xstrdup(path), 0, 0, deref);
bd321bcc JS	150	}
	151	return 0;
	152	}
	153
	154	/* returns a static buffer */
da2478db	155	static const char get_rev_name(const struct object o)
bd321bcc JS	156	{
bd321bcc JS	157	static char buffer[1024];
d3ff6f55 LT	158	struct rev_name *n;
	159	struct commit *c;
	160
1974632c	161	if (o->type != OBJ_COMMIT)
a2cf9f44	162	return NULL;
d3ff6f55 LT	163	c = (struct commit *) o;
d3ff6f55 LT	164	n = c->util;
bd321bcc	165	if (!n)
a2cf9f44	166	return NULL;
bd321bcc JS	167
	168	if (!n->generation)
	169	return n->tip_name;
59d3f541 JS	170	else {
	171	int len = strlen(n->tip_name);
	172	if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
	173	len -= 2;
	174	snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
	175	n->generation);
	176
	177	return buffer;
	178	}
bd321bcc	179	}
1f1e895f	180
da2478db JH	181	static void show_name(const struct object *obj,
	182	const char *caller_name,
	183	int always, int allow_undefined, int name_only)
	184	{
	185	const char *name;
	186	const unsigned char *sha1 = obj->sha1;
	187
	188	if (!name_only)
	189	printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
	190	name = get_rev_name(obj);
	191	if (name)
	192	printf("%s\n", name);
	193	else if (allow_undefined)
	194	printf("undefined\n");
	195	else if (always)
	196	printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
	197	else
	198	die("cannot describe '%s'", sha1_to_hex(sha1));
	199	}
	200
edefb1a2	201	static char const * const name_rev_usage[] = {
422cad0a NTND	202	N_("git name-rev [options] <commit>..."),
	203	N_("git name-rev [options] --all"),
	204	N_("git name-rev [options] --stdin"),
edefb1a2 PH	205	NULL
	206	};
	207
e8b55fab JH	208	static void name_rev_line(char p, struct name_ref_data data)
	209	{
	210	int forty = 0;
	211	char *p_start;
	212	for (p_start = p; *p; p++) {
	213	#define ishex(x) (isdigit((x)) \|\| ((x) >= 'a' && (x) <= 'f'))
	214	if (!ishex(*p))
	215	forty = 0;
	216	else if (++forty == 40 &&
	217	!ishex(*(p+1))) {
	218	unsigned char sha1[40];
	219	const char *name = NULL;
	220	char c = *(p+1);
7c5b1675	221	int p_len = p - p_start + 1;
e8b55fab JH	222
	223	forty = 0;
	224
	225	*(p+1) = 0;
	226	if (!get_sha1(p - 39, sha1)) {
	227	struct object *o =
	228	lookup_object(sha1);
	229	if (o)
	230	name = get_rev_name(o);
	231	}
	232	*(p+1) = c;
	233
	234	if (!name)
	235	continue;
	236
7c5b1675 RS	237	if (data->name_only)
	238	printf("%.*s%s", p_len - 40, p_start, name);
	239	else
	240	printf("%.*s (%s)", p_len, p_start, name);
e8b55fab JH	241	p_start = p + 1;
	242	}
	243	}
	244
	245	/* flush */
	246	if (p_start != p)
	247	fwrite(p_start, p - p_start, 1, stdout);
	248	}
	249
d6b64ed0	250	int cmd_name_rev(int argc, const char *argv, const char prefix)
bd321bcc	251	{
3cd47459	252	struct object_array revs = OBJECT_ARRAY_INIT;
da2478db	253	int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
23615708	254	struct name_ref_data data = { 0, 0, NULL };
edefb1a2	255	struct option opts[] = {
422cad0a NTND	256	OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
	257	OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
	258	OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
	259	N_("only use refs matching <pattern>")),
edefb1a2	260	OPT_GROUP(""),
422cad0a NTND	261	OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
	262	OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
	263	OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
da2478db	264	OPT_BOOLEAN(0, "always", &always,
422cad0a	265	N_("show abbreviated commit object as fallback")),
edefb1a2 PH	266	OPT_END(),
edefb1a2 PH	267	};
bd321bcc	268
ef90d6d4	269	git_config(git_default_config, NULL);
37782920	270	argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
edefb1a2 PH	271	if (!!all + !!transform_stdin + !!argc > 1) {
	272	error("Specify either a list, or --all, not both!");
	273	usage_with_options(name_rev_usage, opts);
	274	}
	275	if (all \|\| transform_stdin)
	276	cutoff = 0;
bd321bcc	277
edefb1a2	278	for (; argc; argc--, argv++) {
bd321bcc JS	279	unsigned char sha1[20];
	280	struct object *o;
	281	struct commit *commit;
	282
bd321bcc JS	283	if (get_sha1(*argv, sha1)) {
	284	fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
	285	*argv);
	286	continue;
	287	}
	288
9534f40b	289	o = deref_tag(parse_object(sha1), *argv, 0);
1974632c	290	if (!o \|\| o->type != OBJ_COMMIT) {
bd321bcc JS	291	fprintf(stderr, "Could not get commit for %s. Skipping.\n",
	292	*argv);
	293	continue;
	294	}
	295
	296	commit = (struct commit *)o;
bd321bcc JS	297	if (cutoff > commit->date)
bd321bcc JS	298	cutoff = commit->date;
1f1e895f	299	add_object_array((struct object )commit, argv, &revs);
bd321bcc JS	300	}
bd321bcc JS	301
c075aea5 JH	302	if (cutoff)
c075aea5 JH	303	cutoff = cutoff - CUTOFF_DATE_SLOP;
2afc29aa	304	for_each_ref(name_ref, &data);
bd321bcc JS	305
	306	if (transform_stdin) {
	307	char buffer[2048];
bd321bcc JS	308
bd321bcc JS	309	while (!feof(stdin)) {
e8b55fab	310	char *p = fgets(buffer, sizeof(buffer), stdin);
bd321bcc JS	311	if (!p)
bd321bcc JS	312	break;
e8b55fab	313	name_rev_line(p, &data);
bd321bcc JS	314	}
bd321bcc JS	315	} else if (all) {
fc046a75	316	int i, max;
bd321bcc	317
fc046a75	318	max = get_max_object_index();
a83123de BS	319	for (i = 0; i < max; i++) {
a83123de BS	320	struct object *obj = get_indexed_object(i);
e8b14d7e	321	if (!obj \|\| obj->type != OBJ_COMMIT)
a83123de BS	322	continue;
a83123de BS	323	show_name(obj, NULL,
da2478db	324	always, allow_undefined, data.name_only);
a83123de	325	}
1f1e895f LT	326	} else {
1f1e895f LT	327	int i;
da2478db JH	328	for (i = 0; i < revs.nr; i++)
	329	show_name(revs.objects[i].item, revs.objects[i].name,
	330	always, allow_undefined, data.name_only);
1f1e895f	331	}
bd321bcc JS	332
	333	return 0;
	334	}