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

/*
 * rev-parse.c
 *
 * Copyright (C) Linus Torvalds, 2005
 */
#include "cache.h"
#include "commit.h"
#include "refs.h"
#include "quote.h"
#include "builtin.h"

#define DO_REVS		1
#define DO_NOREV	2
#define DO_FLAGS	4
#define DO_NONFLAGS	8
static int filter = ~0;

static const char *def = NULL;

#define NORMAL 0
#define REVERSED 1
static int show_type = NORMAL;
static int symbolic = 0;
static int abbrev = 0;
static int output_sq = 0;

static int revs_count = 0;

/*
 * Some arguments are relevant "revision" arguments,
 * others are about output format or other details.
 * This sorts it all out.
 */
static int is_rev_argument(const char *arg)
{
	static const char *rev_args[] = {
		"--all",
		"--bisect",
		"--dense",
		"--branches",
		"--header",
		"--max-age=",
		"--max-count=",
		"--min-age=",
		"--no-merges",
		"--objects",
		"--objects-edge",
		"--parents",
		"--pretty",
		"--remotes",
		"--sparse",
		"--tags",
		"--topo-order",
		"--date-order",
		"--unpacked",
		NULL
	};
	const char **p = rev_args;

	/* accept -<digit>, like traditional "head" */
	if ((*arg == '-') && isdigit(arg[1]))
		return 1;

	for (;;) {
		const char *str = *p++;
		int len;
		if (!str)
			return 0;
		len = strlen(str);
		if (!strcmp(arg, str) ||
		    (str[len-1] == '=' && !strncmp(arg, str, len)))
			return 1;
	}
}

/* Output argument as a string, either SQ or normal */
static void show(const char *arg)
{
	if (output_sq) {
		int sq = '\'', ch;

		putchar(sq);
		while ((ch = *arg++)) {
			if (ch == sq)
				fputs("'\\'", stdout);
			putchar(ch);
		}
		putchar(sq);
		putchar(' ');
	}
	else
		puts(arg);
}

/* Output a revision, only if filter allows it */
static void show_rev(int type, const unsigned char *sha1, const char *name)
{
	if (!(filter & DO_REVS))
		return;
	def = NULL;
	revs_count++;

	if (type != show_type)
		putchar('^');
	if (symbolic && name)
		show(name);
	else if (abbrev)
		show(find_unique_abbrev(sha1, abbrev));
	else
		show(sha1_to_hex(sha1));
}

/* Output a flag, only if filter allows it. */
static int show_flag(const char *arg)
{
	if (!(filter & DO_FLAGS))
		return 0;
	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
		show(arg);
		return 1;
	}
	return 0;
}

static void show_default(void)
{
	const char *s = def;

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

		def = NULL;
		if (!get_sha1(s, sha1)) {
			show_rev(NORMAL, sha1, s);
			return;
		}
	}
}

static int show_reference(const char *refname, const unsigned char *sha1)
{
	show_rev(NORMAL, sha1, refname);
	return 0;
}

static void show_datestring(const char *flag, const char *datestr)
{
	static char buffer[100];

	/* date handling requires both flags and revs */
	if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
		return;
	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
	show(buffer);
}

static int show_file(const char *arg)
{
	show_default();
	if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
		show(arg);
		return 1;
	}
	return 0;
}

static int try_difference(const char *arg)
{
	char *dotdot;
	unsigned char sha1[20];
	unsigned char end[20];
	const char *next;
	const char *this;
	int symmetric;

	if (!(dotdot = strstr(arg, "..")))
		return 0;
	next = dotdot + 2;
	this = arg;
	symmetric = (*next == '.');

	*dotdot = 0;
	next += symmetric;

	if (!*next)
		next = "HEAD";
	if (dotdot == arg)
		this = "HEAD";
	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
		show_rev(NORMAL, end, next);
		show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
		if (symmetric) {
			struct commit_list *exclude;
			struct commit *a, *b;
			a = lookup_commit_reference(sha1);
			b = lookup_commit_reference(end);
			exclude = get_merge_bases(a, b, 1);
			while (exclude) {
				struct commit_list *n = exclude->next;
				show_rev(REVERSED,
					 exclude->item->object.sha1,NULL);
				free(exclude);
				exclude = n;
			}
		}
		return 1;
	}
	*dotdot = '.';
	return 0;
}

int cmd_rev_parse(int argc, const char **argv, const char *prefix)
{
	int i, as_is = 0, verify = 0;
	unsigned char sha1[20];

	git_config(git_default_config);

	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];

		if (as_is) {
			if (show_file(arg) && as_is < 2)
				verify_filename(prefix, arg);
			continue;
		}
		if (!strcmp(arg,"-n")) {
			if (++i >= argc)
				die("-n requires an argument");
			if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
				show(arg);
				show(argv[i]);
			}
			continue;
		}
		if (!strncmp(arg,"-n",2)) {
			if ((filter & DO_FLAGS) && (filter & DO_REVS))
				show(arg);
			continue;
		}

		if (*arg == '-') {
			if (!strcmp(arg, "--")) {
				as_is = 2;
				/* Pass on the "--" if we show anything but files.. */
				if (filter & (DO_FLAGS | DO_REVS))
					show_file(arg);
				continue;
			}
			if (!strcmp(arg, "--default")) {
				def = argv[i+1];
				i++;
				continue;
			}
			if (!strcmp(arg, "--revs-only")) {
				filter &= ~DO_NOREV;
				continue;
			}
			if (!strcmp(arg, "--no-revs")) {
				filter &= ~DO_REVS;
				continue;
			}
			if (!strcmp(arg, "--flags")) {
				filter &= ~DO_NONFLAGS;
				continue;
			}
			if (!strcmp(arg, "--no-flags")) {
				filter &= ~DO_FLAGS;
				continue;
			}
			if (!strcmp(arg, "--verify")) {
				filter &= ~(DO_FLAGS|DO_NOREV);
				verify = 1;
				continue;
			}
			if (!strcmp(arg, "--short") ||
			    !strncmp(arg, "--short=", 8)) {
				filter &= ~(DO_FLAGS|DO_NOREV);
				verify = 1;
				abbrev = DEFAULT_ABBREV;
				if (arg[7] == '=')
					abbrev = strtoul(arg + 8, NULL, 10);
				if (abbrev < MINIMUM_ABBREV)
					abbrev = MINIMUM_ABBREV;
				else if (40 <= abbrev)
					abbrev = 40;
				continue;
			}
			if (!strcmp(arg, "--sq")) {
				output_sq = 1;
				continue;
			}
			if (!strcmp(arg, "--not")) {
				show_type ^= REVERSED;
				continue;
			}
			if (!strcmp(arg, "--symbolic")) {
				symbolic = 1;
				continue;
			}
			if (!strcmp(arg, "--all")) {
				for_each_ref(show_reference);
				continue;
			}
			if (!strcmp(arg, "--branches")) {
				for_each_branch_ref(show_reference);
				continue;
			}
			if (!strcmp(arg, "--tags")) {
				for_each_tag_ref(show_reference);
				continue;
			}
			if (!strcmp(arg, "--remotes")) {
				for_each_remote_ref(show_reference);
				continue;
			}
			if (!strcmp(arg, "--show-prefix")) {
				if (prefix)
					puts(prefix);
				continue;
			}
			if (!strcmp(arg, "--show-cdup")) {
				const char *pfx = prefix;
				while (pfx) {
					pfx = strchr(pfx, '/');
					if (pfx) {
						pfx++;
						printf("../");
					}
				}
				putchar('\n');
				continue;
			}
			if (!strcmp(arg, "--git-dir")) {
				const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
				static char cwd[PATH_MAX];
				if (gitdir) {
					puts(gitdir);
					continue;
				}
				if (!prefix) {
					puts(".git");
					continue;
				}
				if (!getcwd(cwd, PATH_MAX))
					die("unable to get current working directory");
				printf("%s/.git\n", cwd);
				continue;
			}
			if (!strncmp(arg, "--since=", 8)) {
				show_datestring("--max-age=", arg+8);
				continue;
			}
			if (!strncmp(arg, "--after=", 8)) {
				show_datestring("--max-age=", arg+8);
				continue;
			}
			if (!strncmp(arg, "--before=", 9)) {
				show_datestring("--min-age=", arg+9);
				continue;
			}
			if (!strncmp(arg, "--until=", 8)) {
				show_datestring("--min-age=", arg+8);
				continue;
			}
			if (show_flag(arg) && verify)
				die("Needed a single revision");
			continue;
		}

		/* Not a flag argument */
		if (try_difference(arg))
			continue;
		if (!get_sha1(arg, sha1)) {
			show_rev(NORMAL, sha1, arg);
			continue;
		}
		if (*arg == '^' && !get_sha1(arg+1, sha1)) {
			show_rev(REVERSED, sha1, arg+1);
			continue;
		}
		as_is = 1;
		if (!show_file(arg))
			continue;
		if (verify)
			die("Needed a single revision");
		verify_filename(prefix, arg);
	}
	show_default();
	if (verify && revs_count != 1)
		die("Needed a single revision");
	return 0;
}
Commit	Line	Data
178cb243 LT	1	/*
	2	* rev-parse.c
	3	*
	4	* Copyright (C) Linus Torvalds, 2005
	5	*/
	6	#include "cache.h"
a8be83fe	7	#include "commit.h"
960bba0d	8	#include "refs.h"
c1babb1d	9	#include "quote.h"
895f10c3	10	#include "builtin.h"
a8be83fe	11
4866ccf0 JH	12	#define DO_REVS 1
	13	#define DO_NOREV 2
	14	#define DO_FLAGS 4
	15	#define DO_NONFLAGS 8
	16	static int filter = ~0;
	17
16cee38a	18	static const char *def = NULL;
023d66ed	19
042a4ed7 LT	20	#define NORMAL 0
	21	#define REVERSED 1
	22	static int show_type = NORMAL;
4866ccf0	23	static int symbolic = 0;
d5012508	24	static int abbrev = 0;
4866ccf0 JH	25	static int output_sq = 0;
	26
	27	static int revs_count = 0;
042a4ed7	28
921d865e LT	29	/*
	30	* Some arguments are relevant "revision" arguments,
	31	* others are about output format or other details.
	32	* This sorts it all out.
	33	*/
	34	static int is_rev_argument(const char *arg)
	35	{
	36	static const char *rev_args[] = {
e091eb93	37	"--all",
4866ccf0	38	"--bisect",
5a83f3be	39	"--dense",
a62be77f	40	"--branches",
4866ccf0	41	"--header",
921d865e	42	"--max-age=",
4866ccf0	43	"--max-count=",
4866ccf0	44	"--min-age=",
5ccfb758	45	"--no-merges",
4866ccf0	46	"--objects",
c6496575	47	"--objects-edge",
4866ccf0 JH	48	"--parents",
4866ccf0 JH	49	"--pretty",
a62be77f	50	"--remotes",
5a83f3be	51	"--sparse",
a62be77f	52	"--tags",
4866ccf0	53	"--topo-order",
4c8725f1	54	"--date-order",
4866ccf0	55	"--unpacked",
921d865e LT	56	NULL
	57	};
	58	const char **p = rev_args;
	59
8233340c EW	60	/* accept -<digit>, like traditional "head" */
	61	if ((*arg == '-') && isdigit(arg[1]))
	62	return 1;
	63
921d865e LT	64	for (;;) {
	65	const char str = p++;
	66	int len;
	67	if (!str)
	68	return 0;
	69	len = strlen(str);
4866ccf0 JH	70	if (!strcmp(arg, str) \|\|
4866ccf0 JH	71	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	72	return 1;
	73	}
	74	}
	75
4866ccf0	76	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	77	static void show(const char *arg)
	78	{
	79	if (output_sq) {
	80	int sq = '\'', ch;
	81
	82	putchar(sq);
	83	while ((ch = *arg++)) {
	84	if (ch == sq)
	85	fputs("'\\'", stdout);
	86	putchar(ch);
	87	}
	88	putchar(sq);
	89	putchar(' ');
	90	}
	91	else
	92	puts(arg);
	93	}
	94
4866ccf0	95	/* Output a revision, only if filter allows it */
30b96fce	96	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	97	{
4866ccf0	98	if (!(filter & DO_REVS))
023d66ed	99	return;
4866ccf0 JH	100	def = NULL;
4866ccf0 JH	101	revs_count++;
5bb2c65a	102
30b96fce JH	103	if (type != show_type)
	104	putchar('^');
	105	if (symbolic && name)
	106	show(name);
d5012508 JH	107	else if (abbrev)
d5012508 JH	108	show(find_unique_abbrev(sha1, abbrev));
30b96fce JH	109	else
30b96fce JH	110	show(sha1_to_hex(sha1));
023d66ed LT	111	}
023d66ed LT	112
4866ccf0	113	/* Output a flag, only if filter allows it. */
16cee38a	114	static int show_flag(const char *arg)
023d66ed	115	{
4866ccf0	116	if (!(filter & DO_FLAGS))
9523a4c2 LT	117	return 0;
9523a4c2 LT	118	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	119	show(arg);
9523a4c2 LT	120	return 1;
	121	}
	122	return 0;
023d66ed LT	123	}
023d66ed LT	124
023d66ed LT	125	static void show_default(void)
023d66ed LT	126	{
16cee38a	127	const char *s = def;
023d66ed LT	128
	129	if (s) {
	130	unsigned char sha1[20];
	131
	132	def = NULL;
9938af6a	133	if (!get_sha1(s, sha1)) {
30b96fce	134	show_rev(NORMAL, sha1, s);
023d66ed LT	135	return;
023d66ed LT	136	}
023d66ed LT	137	}
	138	}
	139
960bba0d LT	140	static int show_reference(const char refname, const unsigned char sha1)
960bba0d LT	141	{
30b96fce	142	show_rev(NORMAL, sha1, refname);
960bba0d LT	143	return 0;
	144	}
	145
c1babb1d LT	146	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	147	{
c1babb1d	148	static char buffer[100];
c1babb1d LT	149
	150	/* date handling requires both flags and revs */
	151	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	152	return;
3c07b1d1	153	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	154	show(buffer);
	155	}
	156
9ad0a933	157	static int show_file(const char *arg)
7a3dd472	158	{
7b34c2fa	159	show_default();
9ad0a933	160	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	161	show(arg);
9ad0a933 LT	162	return 1;
	163	}
	164	return 0;
7a3dd472 LT	165	}
7a3dd472 LT	166
b7d936b2	167	static int try_difference(const char *arg)
3dd4e732 SB	168	{
	169	char *dotdot;
	170	unsigned char sha1[20];
	171	unsigned char end[20];
	172	const char *next;
	173	const char *this;
	174	int symmetric;
	175
	176	if (!(dotdot = strstr(arg, "..")))
	177	return 0;
	178	next = dotdot + 2;
	179	this = arg;
	180	symmetric = (*next == '.');
	181
	182	*dotdot = 0;
	183	next += symmetric;
	184
	185	if (!*next)
	186	next = "HEAD";
	187	if (dotdot == arg)
	188	this = "HEAD";
	189	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	190	show_rev(NORMAL, end, next);
	191	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	192	if (symmetric) {
	193	struct commit_list *exclude;
	194	struct commit a, b;
	195	a = lookup_commit_reference(sha1);
	196	b = lookup_commit_reference(end);
	197	exclude = get_merge_bases(a, b, 1);
	198	while (exclude) {
	199	struct commit_list *n = exclude->next;
	200	show_rev(REVERSED,
	201	exclude->item->object.sha1,NULL);
	202	free(exclude);
	203	exclude = n;
	204	}
	205	}
	206	return 1;
	207	}
	208	*dotdot = '.';
	209	return 0;
	210	}
	211
a633fca0	212	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	213	{
4866ccf0	214	int i, as_is = 0, verify = 0;
178cb243	215	unsigned char sha1[20];
a62be77f	216
84a9b58c JH	217	git_config(git_default_config);
84a9b58c JH	218
178cb243	219	for (i = 1; i < argc; i++) {
16cee38a	220	const char *arg = argv[i];
fb18a2ed	221
178cb243	222	if (as_is) {
fb18a2ed	223	if (show_file(arg) && as_is < 2)
e23d0b4a	224	verify_filename(prefix, arg);
178cb243 LT	225	continue;
178cb243 LT	226	}
3af06987 EW	227	if (!strcmp(arg,"-n")) {
	228	if (++i >= argc)
	229	die("-n requires an argument");
	230	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	231	show(arg);
	232	show(argv[i]);
	233	}
	234	continue;
	235	}
	236	if (!strncmp(arg,"-n",2)) {
	237	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	238	show(arg);
	239	continue;
	240	}
	241
178cb243 LT	242	if (*arg == '-') {
178cb243 LT	243	if (!strcmp(arg, "--")) {
fb18a2ed	244	as_is = 2;
a08b6505 LT	245	/* Pass on the "--" if we show anything but files.. */
	246	if (filter & (DO_FLAGS \| DO_REVS))
	247	show_file(arg);
4866ccf0	248	continue;
178cb243 LT	249	}
178cb243 LT	250	if (!strcmp(arg, "--default")) {
178cb243 LT	251	def = argv[i+1];
	252	i++;
	253	continue;
	254	}
8ebb0184	255	if (!strcmp(arg, "--revs-only")) {
4866ccf0	256	filter &= ~DO_NOREV;
8ebb0184 LT	257	continue;
	258	}
	259	if (!strcmp(arg, "--no-revs")) {
4866ccf0	260	filter &= ~DO_REVS;
8ebb0184 LT	261	continue;
8ebb0184 LT	262	}
f79b65aa	263	if (!strcmp(arg, "--flags")) {
4866ccf0	264	filter &= ~DO_NONFLAGS;
f79b65aa LT	265	continue;
	266	}
	267	if (!strcmp(arg, "--no-flags")) {
4866ccf0	268	filter &= ~DO_FLAGS;
f79b65aa LT	269	continue;
f79b65aa LT	270	}
023d66ed	271	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	272	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	273	verify = 1;
023d66ed	274	continue;
921d865e	275	}
62a604ba	276	if (!strcmp(arg, "--short") \|\|
44de0da4	277	!strncmp(arg, "--short=", 8)) {
d5012508 JH	278	filter &= ~(DO_FLAGS\|DO_NOREV);
	279	verify = 1;
	280	abbrev = DEFAULT_ABBREV;
44de0da4 JF	281	if (arg[7] == '=')
44de0da4 JF	282	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	283	if (abbrev < MINIMUM_ABBREV)
	284	abbrev = MINIMUM_ABBREV;
	285	else if (40 <= abbrev)
	286	abbrev = 40;
d5012508 JH	287	continue;
d5012508 JH	288	}
5bb2c65a JH	289	if (!strcmp(arg, "--sq")) {
	290	output_sq = 1;
	291	continue;
	292	}
042a4ed7 LT	293	if (!strcmp(arg, "--not")) {
	294	show_type ^= REVERSED;
	295	continue;
	296	}
30b96fce JH	297	if (!strcmp(arg, "--symbolic")) {
	298	symbolic = 1;
	299	continue;
	300	}
960bba0d LT	301	if (!strcmp(arg, "--all")) {
	302	for_each_ref(show_reference);
	303	continue;
	304	}
a62be77f SE	305	if (!strcmp(arg, "--branches")) {
	306	for_each_branch_ref(show_reference);
	307	continue;
	308	}
	309	if (!strcmp(arg, "--tags")) {
	310	for_each_tag_ref(show_reference);
	311	continue;
	312	}
	313	if (!strcmp(arg, "--remotes")) {
	314	for_each_remote_ref(show_reference);
	315	continue;
	316	}
d288a700	317	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	318	if (prefix)
4866ccf0 JH	319	puts(prefix);
d288a700 LT	320	continue;
d288a700 LT	321	}
5f94c730 JH	322	if (!strcmp(arg, "--show-cdup")) {
	323	const char *pfx = prefix;
	324	while (pfx) {
	325	pfx = strchr(pfx, '/');
	326	if (pfx) {
	327	pfx++;
	328	printf("../");
	329	}
	330	}
	331	putchar('\n');
	332	continue;
	333	}
a8783eeb LT	334	if (!strcmp(arg, "--git-dir")) {
	335	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	336	static char cwd[PATH_MAX];
	337	if (gitdir) {
	338	puts(gitdir);
	339	continue;
	340	}
	341	if (!prefix) {
	342	puts(".git");
	343	continue;
	344	}
	345	if (!getcwd(cwd, PATH_MAX))
	346	die("unable to get current working directory");
	347	printf("%s/.git\n", cwd);
	348	continue;
	349	}
c1babb1d LT	350	if (!strncmp(arg, "--since=", 8)) {
	351	show_datestring("--max-age=", arg+8);
	352	continue;
	353	}
	354	if (!strncmp(arg, "--after=", 8)) {
	355	show_datestring("--max-age=", arg+8);
	356	continue;
	357	}
	358	if (!strncmp(arg, "--before=", 9)) {
	359	show_datestring("--min-age=", arg+9);
	360	continue;
	361	}
	362	if (!strncmp(arg, "--until=", 8)) {
	363	show_datestring("--min-age=", arg+8);
	364	continue;
	365	}
9523a4c2	366	if (show_flag(arg) && verify)
4866ccf0	367	die("Needed a single revision");
178cb243 LT	368	continue;
178cb243 LT	369	}
4866ccf0 JH	370
4866ccf0 JH	371	/* Not a flag argument */
3dd4e732 SB	372	if (try_difference(arg))
3dd4e732 SB	373	continue;
9938af6a	374	if (!get_sha1(arg, sha1)) {
30b96fce	375	show_rev(NORMAL, sha1, arg);
800644c5 LT	376	continue;
800644c5 LT	377	}
9938af6a	378	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	379	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	380	continue;
800644c5 LT	381	}
9ad0a933 LT	382	as_is = 1;
	383	if (!show_file(arg))
	384	continue;
4866ccf0 JH	385	if (verify)
4866ccf0 JH	386	die("Needed a single revision");
e23d0b4a	387	verify_filename(prefix, arg);
023d66ed LT	388	}
023d66ed LT	389	show_default();
4866ccf0 JH	390	if (verify && revs_count != 1)
4866ccf0 JH	391	die("Needed a single revision");
178cb243 LT	392	return 0;
178cb243 LT	393	}