[thirdparty/git.git] / builtin-show-ref.c

#include "cache.h"
#include "refs.h"
#include "object.h"
#include "tag.h"
#include "path-list.h"

static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] | --filter-invalid < ref-list";

static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
	found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
static const char **pattern;

static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
{
	struct object *obj;
	const char *hex;
	unsigned char peeled[20];

	if (tags_only || heads_only) {
		int match;

		match = heads_only && !strncmp(refname, "refs/heads/", 11);
		match |= tags_only && !strncmp(refname, "refs/tags/", 10);
		if (!match)
			return 0;
	}
	if (pattern) {
		int reflen = strlen(refname);
		const char **p = pattern, *m;
		while ((m = *p++) != NULL) {
			int len = strlen(m);
			if (len > reflen)
				continue;
			if (memcmp(m, refname + reflen - len, len))
				continue;
			if (len == reflen)
				goto match;
			/* "--verify" requires an exact match */
			if (verify)
				continue;
			if (refname[reflen - len - 1] == '/')
				goto match;
		}
		return 0;
	}

match:
	found_match++;

	/* This changes the semantics slightly that even under quiet we
	 * detect and return error if the repository is corrupt and
	 * ref points at a nonexistent object.
	 */
	if (!has_sha1_file(sha1))
		die("git-show-ref: bad ref %s (%s)", refname,
		    sha1_to_hex(sha1));

	if (quiet)
		return 0;

	hex = find_unique_abbrev(sha1, abbrev);
	if (hash_only)
		printf("%s\n", hex);
	else
		printf("%s %s\n", hex, refname);

	if (!deref_tags)
		return 0;

	if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
		if (!is_null_sha1(peeled)) {
			hex = find_unique_abbrev(peeled, abbrev);
			printf("%s %s^{}\n", hex, refname);
		}
	}
	else {
		obj = parse_object(sha1);
		if (!obj)
			die("git-show-ref: bad ref %s (%s)", refname,
			    sha1_to_hex(sha1));
		if (obj->type == OBJ_TAG) {
			obj = deref_tag(obj, refname, 0);
			hex = find_unique_abbrev(obj->sha1, abbrev);
			printf("%s %s^{}\n", hex, refname);
		}
	}
	return 0;
}

static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
{
	struct path_list *list = (struct path_list *)cbdata;
	path_list_insert(refname, list);
	return 0;
}

/*
 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 * and
 * (1) strip "^{}" at the end of line if any;
 * (2) ignore if match is provided and does not head-match refname;
 * (3) warn if refname is not a well-formed refname and skip;
 * (4) ignore if refname is a ref that exists in the local repository;
 * (5) otherwise output the line.
 */
static int exclude_existing(const char *match)
{
	static struct path_list existing_refs = { NULL, 0, 0, 0 };
	char buf[1024];
	int matchlen = match ? strlen(match) : 0;

	for_each_ref(add_existing, &existing_refs);
	while (fgets(buf, sizeof(buf), stdin)) {
		int len = strlen(buf);
		char *ref;
		if (len > 0 && buf[len - 1] == '\n')
			buf[--len] = '\0';
		if (!strcmp(buf + len - 3, "^{}")) {
			len -= 3;
			buf[len] = '\0';
		}
		for (ref = buf + len; buf < ref; ref--)
			if (isspace(ref[-1]))
				break;
		if (match) {
			int reflen = buf + len - ref;
			if (reflen < matchlen)
				continue;
			if (strncmp(ref, match, matchlen))
				continue;
		}
		if (check_ref_format(ref)) {
			fprintf(stderr, "warning: ref '%s' ignored\n", ref);
			continue;
		}
		if (!path_list_has_path(&existing_refs, ref)) {
			printf("%s\n", buf);
		}
	}
	return 0;
}

int cmd_show_ref(int argc, const char **argv, const char *prefix)
{
	int i;

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];
		if (*arg != '-') {
			pattern = argv + i;
			break;
		}
		if (!strcmp(arg, "--")) {
			pattern = argv + i + 1;
			if (!*pattern)
				pattern = NULL;
			break;
		}
		if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
			quiet = 1;
			continue;
		}
		if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
			show_head = 1;
			continue;
		}
		if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
			deref_tags = 1;
			continue;
		}
		if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
			hash_only = 1;
			continue;
		}
		if (!strncmp(arg, "--hash=", 7) ||
		    (!strncmp(arg, "--abbrev", 8) &&
		     (arg[8] == '=' || arg[8] == '\0'))) {
			if (arg[3] != 'h' && !arg[8])
				/* --abbrev only */
				abbrev = DEFAULT_ABBREV;
			else {
				/* --hash= or --abbrev= */
				char *end;
				if (arg[3] == 'h') {
					hash_only = 1;
					arg += 7;
				}
				else
					arg += 9;
				abbrev = strtoul(arg, &end, 10);
				if (*end || abbrev > 40)
					usage(show_ref_usage);
				if (abbrev < MINIMUM_ABBREV)
					abbrev = MINIMUM_ABBREV;
			}
			continue;
		}
		if (!strcmp(arg, "--verify")) {
			verify = 1;
			continue;
		}
		if (!strcmp(arg, "--tags")) {
			tags_only = 1;
			continue;
		}
		if (!strcmp(arg, "--heads")) {
			heads_only = 1;
			continue;
		}
		if (!strcmp(arg, "--exclude-existing"))
			return exclude_existing(NULL);
		if (!strncmp(arg, "--exclude-existing=", 19))
			return exclude_existing(arg + 19);
		usage(show_ref_usage);
	}

	if (verify) {
		unsigned char sha1[20];

		while (*pattern) {
			if (resolve_ref(*pattern, sha1, 1, NULL))
				printf("%s %s\n", sha1_to_hex(sha1),
				       *pattern);
			else if (!quiet)
				die("'%s' - not a valid ref", *pattern);
			else
				return 1;
			pattern++;
		}
		return 0;
	}

	if (show_head)
		head_ref(show_ref, NULL);
	for_each_ref(show_ref, NULL);
	if (!found_match) {
		if (verify && !quiet)
			die("No match");
		return 1;
	}
	return 0;
}
Commit	Line	Data
358ddb62 LT	1	#include "cache.h"
	2	#include "refs.h"
	3	#include "object.h"
	4	#include "tag.h"
ed9f7c95	5	#include "path-list.h"
358ddb62	6
ed9f7c95	7	static const char show_ref_usage[] = "git show-ref [-q\|--quiet] [--verify] [-h\|--head] [-d\|--dereference] [-s\|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] \| --filter-invalid < ref-list";
358ddb62	8
c40abef8	9	static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
2eaf2224	10	found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
358ddb62 LT	11	static const char **pattern;
358ddb62 LT	12
eaf12a8c	13	static int show_ref(const char refname, const unsigned char sha1, int flag, void *cbdata)
358ddb62 LT	14	{
358ddb62 LT	15	struct object *obj;
2eaf2224	16	const char *hex;
cf0adba7	17	unsigned char peeled[20];
358ddb62 LT	18
	19	if (tags_only \|\| heads_only) {
	20	int match;
	21
	22	match = heads_only && !strncmp(refname, "refs/heads/", 11);
	23	match \|= tags_only && !strncmp(refname, "refs/tags/", 10);
	24	if (!match)
	25	return 0;
	26	}
	27	if (pattern) {
	28	int reflen = strlen(refname);
	29	const char *p = pattern, m;
	30	while ((m = *p++) != NULL) {
	31	int len = strlen(m);
	32	if (len > reflen)
	33	continue;
	34	if (memcmp(m, refname + reflen - len, len))
	35	continue;
	36	if (len == reflen)
	37	goto match;
	38	/* "--verify" requires an exact match */
	39	if (verify)
	40	continue;
	41	if (refname[reflen - len - 1] == '/')
	42	goto match;
	43	}
	44	return 0;
	45	}
	46
	47	match:
	48	found_match++;
cf0adba7 JH	49
	50	/* This changes the semantics slightly that even under quiet we
	51	* detect and return error if the repository is corrupt and
	52	* ref points at a nonexistent object.
	53	*/
	54	if (!has_sha1_file(sha1))
	55	die("git-show-ref: bad ref %s (%s)", refname,
	56	sha1_to_hex(sha1));
	57
358ddb62 LT	58	if (quiet)
358ddb62 LT	59	return 0;
2eaf2224 JH	60
2eaf2224 JH	61	hex = find_unique_abbrev(sha1, abbrev);
c40abef8	62	if (hash_only)
2eaf2224	63	printf("%s\n", hex);
c40abef8	64	else
2eaf2224	65	printf("%s %s\n", hex, refname);
cf0adba7 JH	66
	67	if (!deref_tags)
	68	return 0;
	69
	70	if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
f4204ab9 JH	71	if (!is_null_sha1(peeled)) {
	72	hex = find_unique_abbrev(peeled, abbrev);
	73	printf("%s %s^{}\n", hex, refname);
	74	}
358ddb62	75	}
cf0adba7 JH	76	else {
	77	obj = parse_object(sha1);
	78	if (!obj)
	79	die("git-show-ref: bad ref %s (%s)", refname,
	80	sha1_to_hex(sha1));
	81	if (obj->type == OBJ_TAG) {
	82	obj = deref_tag(obj, refname, 0);
	83	hex = find_unique_abbrev(obj->sha1, abbrev);
	84	printf("%s %s^{}\n", hex, refname);
	85	}
	86	}
358ddb62 LT	87	return 0;
	88	}
	89
ed9f7c95 JH	90	static int add_existing(const char refname, const unsigned char sha1, int flag, void *cbdata)
	91	{
	92	struct path_list list = (struct path_list )cbdata;
	93	path_list_insert(refname, list);
	94	return 0;
	95	}
	96
	97	/*
	98	* read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
	99	* and
	100	* (1) strip "^{}" at the end of line if any;
	101	* (2) ignore if match is provided and does not head-match refname;
	102	* (3) warn if refname is not a well-formed refname and skip;
	103	* (4) ignore if refname is a ref that exists in the local repository;
	104	* (5) otherwise output the line.
	105	*/
	106	static int exclude_existing(const char *match)
	107	{
	108	static struct path_list existing_refs = { NULL, 0, 0, 0 };
	109	char buf[1024];
	110	int matchlen = match ? strlen(match) : 0;
	111
	112	for_each_ref(add_existing, &existing_refs);
	113	while (fgets(buf, sizeof(buf), stdin)) {
	114	int len = strlen(buf);
	115	char *ref;
	116	if (len > 0 && buf[len - 1] == '\n')
	117	buf[--len] = '\0';
	118	if (!strcmp(buf + len - 3, "^{}")) {
	119	len -= 3;
	120	buf[len] = '\0';
	121	}
	122	for (ref = buf + len; buf < ref; ref--)
	123	if (isspace(ref[-1]))
	124	break;
	125	if (match) {
	126	int reflen = buf + len - ref;
	127	if (reflen < matchlen)
	128	continue;
	129	if (strncmp(ref, match, matchlen))
	130	continue;
	131	}
	132	if (check_ref_format(ref)) {
	133	fprintf(stderr, "warning: ref '%s' ignored\n", ref);
	134	continue;
	135	}
	136	if (!path_list_has_path(&existing_refs, ref)) {
	137	printf("%s\n", buf);
	138	}
	139	}
	140	return 0;
	141	}
	142
358ddb62 LT	143	int cmd_show_ref(int argc, const char *argv, const char prefix)
	144	{
	145	int i;
	146
	147	for (i = 1; i < argc; i++) {
	148	const char *arg = argv[i];
	149	if (*arg != '-') {
	150	pattern = argv + i;
	151	break;
	152	}
	153	if (!strcmp(arg, "--")) {
	154	pattern = argv + i + 1;
	155	if (!*pattern)
	156	pattern = NULL;
	157	break;
	158	}
	159	if (!strcmp(arg, "-q") \|\| !strcmp(arg, "--quiet")) {
	160	quiet = 1;
	161	continue;
	162	}
	163	if (!strcmp(arg, "-h") \|\| !strcmp(arg, "--head")) {
	164	show_head = 1;
	165	continue;
	166	}
	167	if (!strcmp(arg, "-d") \|\| !strcmp(arg, "--dereference")) {
	168	deref_tags = 1;
	169	continue;
	170	}
c40abef8 CC	171	if (!strcmp(arg, "-s") \|\| !strcmp(arg, "--hash")) {
	172	hash_only = 1;
	173	continue;
	174	}
2eaf2224 JH	175	if (!strncmp(arg, "--hash=", 7) \|\|
	176	(!strncmp(arg, "--abbrev", 8) &&
	177	(arg[8] == '=' \|\| arg[8] == '\0'))) {
	178	if (arg[3] != 'h' && !arg[8])
	179	/* --abbrev only */
	180	abbrev = DEFAULT_ABBREV;
	181	else {
	182	/* --hash= or --abbrev= */
	183	char *end;
	184	if (arg[3] == 'h') {
	185	hash_only = 1;
	186	arg += 7;
	187	}
	188	else
	189	arg += 9;
	190	abbrev = strtoul(arg, &end, 10);
	191	if (*end \|\| abbrev > 40)
	192	usage(show_ref_usage);
	193	if (abbrev < MINIMUM_ABBREV)
	194	abbrev = MINIMUM_ABBREV;
	195	}
	196	continue;
	197	}
358ddb62 LT	198	if (!strcmp(arg, "--verify")) {
	199	verify = 1;
	200	continue;
	201	}
	202	if (!strcmp(arg, "--tags")) {
	203	tags_only = 1;
	204	continue;
	205	}
	206	if (!strcmp(arg, "--heads")) {
	207	heads_only = 1;
	208	continue;
	209	}
ed9f7c95 JH	210	if (!strcmp(arg, "--exclude-existing"))
	211	return exclude_existing(NULL);
	212	if (!strncmp(arg, "--exclude-existing=", 19))
	213	return exclude_existing(arg + 19);
358ddb62 LT	214	usage(show_ref_usage);
358ddb62 LT	215	}
26cdd1e7 JH	216
	217	if (verify) {
	218	unsigned char sha1[20];
	219
	220	while (*pattern) {
	221	if (resolve_ref(*pattern, sha1, 1, NULL))
	222	printf("%s %s\n", sha1_to_hex(sha1),
	223	*pattern);
	224	else if (!quiet)
	225	die("'%s' - not a valid ref", *pattern);
	226	else
	227	return 1;
	228	pattern++;
	229	}
	230	return 0;
	231	}
	232
358ddb62	233	if (show_head)
eaf12a8c JH	234	head_ref(show_ref, NULL);
eaf12a8c JH	235	for_each_ref(show_ref, NULL);
358ddb62 LT	236	if (!found_match) {
	237	if (verify && !quiet)
	238	die("No match");
	239	return 1;
	240	}
	241	return 0;
	242	}