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

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

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

static 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",
		"--header",
		"--max-age=",
		"--max-count=",
		"--min-age=",
		"--no-merges",
		"--objects",
		"--objects-edge",
		"--parents",
		"--pretty",
		"--sparse",
		"--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(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)
{
	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;
}

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

	for (i = 1; i < argc; i++) {
		struct stat st;
		char *arg = argv[i];
		char *dotdot;
	
		if (as_is) {
			show_file(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 = 1;
				/* 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, "--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 */
		dotdot = strstr(arg, "..");
		if (dotdot) {
			unsigned char end[20];
			char *n = dotdot+2;
			*dotdot = 0;
			if (!get_sha1(arg, sha1)) {
				if (!*n)
					n = "HEAD";
				if (!get_sha1(n, end)) {
					show_rev(NORMAL, end, n);
					show_rev(REVERSED, sha1, arg);
					continue;
				}
			}
			*dotdot = '.';
		}
		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");
		if (lstat(arg, &st) < 0)
			die("'%s': %s", arg, strerror(errno));
	}
	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"
a8be83fe	10
4866ccf0 JH	11	#define DO_REVS 1
	12	#define DO_NOREV 2
	13	#define DO_FLAGS 4
	14	#define DO_NONFLAGS 8
	15	static int filter = ~0;
	16
023d66ed	17	static char *def = NULL;
023d66ed	18
042a4ed7 LT	19	#define NORMAL 0
	20	#define REVERSED 1
	21	static int show_type = NORMAL;
4866ccf0	22	static int symbolic = 0;
d5012508	23	static int abbrev = 0;
4866ccf0 JH	24	static int output_sq = 0;
	25
	26	static int revs_count = 0;
042a4ed7	27
921d865e LT	28	/*
	29	* Some arguments are relevant "revision" arguments,
	30	* others are about output format or other details.
	31	* This sorts it all out.
	32	*/
	33	static int is_rev_argument(const char *arg)
	34	{
	35	static const char *rev_args[] = {
e091eb93	36	"--all",
4866ccf0	37	"--bisect",
5a83f3be	38	"--dense",
4866ccf0	39	"--header",
921d865e	40	"--max-age=",
4866ccf0	41	"--max-count=",
4866ccf0	42	"--min-age=",
5ccfb758	43	"--no-merges",
4866ccf0	44	"--objects",
c6496575	45	"--objects-edge",
4866ccf0 JH	46	"--parents",
4866ccf0 JH	47	"--pretty",
5a83f3be	48	"--sparse",
4866ccf0	49	"--topo-order",
4c8725f1	50	"--date-order",
4866ccf0	51	"--unpacked",
921d865e LT	52	NULL
	53	};
	54	const char **p = rev_args;
	55
8233340c EW	56	/* accept -<digit>, like traditional "head" */
	57	if ((*arg == '-') && isdigit(arg[1]))
	58	return 1;
	59
921d865e LT	60	for (;;) {
	61	const char str = p++;
	62	int len;
	63	if (!str)
	64	return 0;
	65	len = strlen(str);
4866ccf0 JH	66	if (!strcmp(arg, str) \|\|
4866ccf0 JH	67	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	68	return 1;
	69	}
	70	}
	71
4866ccf0	72	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	73	static void show(const char *arg)
	74	{
	75	if (output_sq) {
	76	int sq = '\'', ch;
	77
	78	putchar(sq);
	79	while ((ch = *arg++)) {
	80	if (ch == sq)
	81	fputs("'\\'", stdout);
	82	putchar(ch);
	83	}
	84	putchar(sq);
	85	putchar(' ');
	86	}
	87	else
	88	puts(arg);
	89	}
	90
4866ccf0	91	/* Output a revision, only if filter allows it */
30b96fce	92	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	93	{
4866ccf0	94	if (!(filter & DO_REVS))
023d66ed	95	return;
4866ccf0 JH	96	def = NULL;
4866ccf0 JH	97	revs_count++;
5bb2c65a	98
30b96fce JH	99	if (type != show_type)
	100	putchar('^');
	101	if (symbolic && name)
	102	show(name);
d5012508 JH	103	else if (abbrev)
d5012508 JH	104	show(find_unique_abbrev(sha1, abbrev));
30b96fce JH	105	else
30b96fce JH	106	show(sha1_to_hex(sha1));
023d66ed LT	107	}
023d66ed LT	108
4866ccf0	109	/* Output a flag, only if filter allows it. */
9523a4c2	110	static int show_flag(char *arg)
023d66ed	111	{
4866ccf0	112	if (!(filter & DO_FLAGS))
9523a4c2 LT	113	return 0;
9523a4c2 LT	114	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	115	show(arg);
9523a4c2 LT	116	return 1;
	117	}
	118	return 0;
023d66ed LT	119	}
023d66ed LT	120
023d66ed LT	121	static void show_default(void)
	122	{
	123	char *s = def;
	124
	125	if (s) {
	126	unsigned char sha1[20];
	127
	128	def = NULL;
9938af6a	129	if (!get_sha1(s, sha1)) {
30b96fce	130	show_rev(NORMAL, sha1, s);
023d66ed LT	131	return;
023d66ed LT	132	}
023d66ed LT	133	}
	134	}
	135
960bba0d LT	136	static int show_reference(const char refname, const unsigned char sha1)
960bba0d LT	137	{
30b96fce	138	show_rev(NORMAL, sha1, refname);
960bba0d LT	139	return 0;
	140	}
	141
c1babb1d LT	142	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	143	{
c1babb1d	144	static char buffer[100];
c1babb1d LT	145
	146	/* date handling requires both flags and revs */
	147	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	148	return;
3c07b1d1	149	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	150	show(buffer);
	151	}
	152
9ad0a933	153	static int show_file(const char *arg)
7a3dd472	154	{
7b34c2fa	155	show_default();
9ad0a933	156	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	157	show(arg);
9ad0a933 LT	158	return 1;
	159	}
	160	return 0;
7a3dd472 LT	161	}
7a3dd472 LT	162
178cb243 LT	163	int main(int argc, char **argv)
178cb243 LT	164	{
4866ccf0	165	int i, as_is = 0, verify = 0;
178cb243	166	unsigned char sha1[20];
d288a700 LT	167	const char *prefix = setup_git_directory();
d288a700 LT	168
84a9b58c JH	169	git_config(git_default_config);
84a9b58c JH	170
178cb243	171	for (i = 1; i < argc; i++) {
d8f6b342	172	struct stat st;
178cb243 LT	173	char *arg = argv[i];
	174	char *dotdot;
	175
	176	if (as_is) {
7a3dd472	177	show_file(arg);
178cb243 LT	178	continue;
178cb243 LT	179	}
3af06987 EW	180	if (!strcmp(arg,"-n")) {
	181	if (++i >= argc)
	182	die("-n requires an argument");
	183	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	184	show(arg);
	185	show(argv[i]);
	186	}
	187	continue;
	188	}
	189	if (!strncmp(arg,"-n",2)) {
	190	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	191	show(arg);
	192	continue;
	193	}
	194
178cb243 LT	195	if (*arg == '-') {
178cb243 LT	196	if (!strcmp(arg, "--")) {
178cb243	197	as_is = 1;
a08b6505 LT	198	/* Pass on the "--" if we show anything but files.. */
	199	if (filter & (DO_FLAGS \| DO_REVS))
	200	show_file(arg);
4866ccf0	201	continue;
178cb243 LT	202	}
178cb243 LT	203	if (!strcmp(arg, "--default")) {
178cb243 LT	204	def = argv[i+1];
	205	i++;
	206	continue;
	207	}
8ebb0184	208	if (!strcmp(arg, "--revs-only")) {
4866ccf0	209	filter &= ~DO_NOREV;
8ebb0184 LT	210	continue;
	211	}
	212	if (!strcmp(arg, "--no-revs")) {
4866ccf0	213	filter &= ~DO_REVS;
8ebb0184 LT	214	continue;
8ebb0184 LT	215	}
f79b65aa	216	if (!strcmp(arg, "--flags")) {
4866ccf0	217	filter &= ~DO_NONFLAGS;
f79b65aa LT	218	continue;
	219	}
	220	if (!strcmp(arg, "--no-flags")) {
4866ccf0	221	filter &= ~DO_FLAGS;
f79b65aa LT	222	continue;
f79b65aa LT	223	}
023d66ed	224	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	225	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	226	verify = 1;
023d66ed	227	continue;
921d865e	228	}
62a604ba	229	if (!strcmp(arg, "--short") \|\|
44de0da4	230	!strncmp(arg, "--short=", 8)) {
d5012508 JH	231	filter &= ~(DO_FLAGS\|DO_NOREV);
	232	verify = 1;
	233	abbrev = DEFAULT_ABBREV;
44de0da4 JF	234	if (arg[7] == '=')
44de0da4 JF	235	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	236	if (abbrev < MINIMUM_ABBREV)
	237	abbrev = MINIMUM_ABBREV;
	238	else if (40 <= abbrev)
	239	abbrev = 40;
d5012508 JH	240	continue;
d5012508 JH	241	}
5bb2c65a JH	242	if (!strcmp(arg, "--sq")) {
	243	output_sq = 1;
	244	continue;
	245	}
042a4ed7 LT	246	if (!strcmp(arg, "--not")) {
	247	show_type ^= REVERSED;
	248	continue;
	249	}
30b96fce JH	250	if (!strcmp(arg, "--symbolic")) {
	251	symbolic = 1;
	252	continue;
	253	}
960bba0d LT	254	if (!strcmp(arg, "--all")) {
	255	for_each_ref(show_reference);
	256	continue;
	257	}
d288a700	258	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	259	if (prefix)
4866ccf0 JH	260	puts(prefix);
d288a700 LT	261	continue;
d288a700 LT	262	}
5f94c730 JH	263	if (!strcmp(arg, "--show-cdup")) {
	264	const char *pfx = prefix;
	265	while (pfx) {
	266	pfx = strchr(pfx, '/');
	267	if (pfx) {
	268	pfx++;
	269	printf("../");
	270	}
	271	}
	272	putchar('\n');
	273	continue;
	274	}
a8783eeb LT	275	if (!strcmp(arg, "--git-dir")) {
	276	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	277	static char cwd[PATH_MAX];
	278	if (gitdir) {
	279	puts(gitdir);
	280	continue;
	281	}
	282	if (!prefix) {
	283	puts(".git");
	284	continue;
	285	}
	286	if (!getcwd(cwd, PATH_MAX))
	287	die("unable to get current working directory");
	288	printf("%s/.git\n", cwd);
	289	continue;
	290	}
c1babb1d LT	291	if (!strncmp(arg, "--since=", 8)) {
	292	show_datestring("--max-age=", arg+8);
	293	continue;
	294	}
	295	if (!strncmp(arg, "--after=", 8)) {
	296	show_datestring("--max-age=", arg+8);
	297	continue;
	298	}
	299	if (!strncmp(arg, "--before=", 9)) {
	300	show_datestring("--min-age=", arg+9);
	301	continue;
	302	}
	303	if (!strncmp(arg, "--until=", 8)) {
	304	show_datestring("--min-age=", arg+8);
	305	continue;
	306	}
9523a4c2	307	if (show_flag(arg) && verify)
4866ccf0	308	die("Needed a single revision");
178cb243 LT	309	continue;
178cb243 LT	310	}
4866ccf0 JH	311
4866ccf0 JH	312	/* Not a flag argument */
178cb243 LT	313	dotdot = strstr(arg, "..");
	314	if (dotdot) {
	315	unsigned char end[20];
	316	char *n = dotdot+2;
	317	*dotdot = 0;
9938af6a	318	if (!get_sha1(arg, sha1)) {
178cb243 LT	319	if (!*n)
178cb243 LT	320	n = "HEAD";
9938af6a	321	if (!get_sha1(n, end)) {
30b96fce JH	322	show_rev(NORMAL, end, n);
30b96fce JH	323	show_rev(REVERSED, sha1, arg);
178cb243 LT	324	continue;
	325	}
	326	}
	327	*dotdot = '.';
	328	}
9938af6a	329	if (!get_sha1(arg, sha1)) {
30b96fce	330	show_rev(NORMAL, sha1, arg);
800644c5 LT	331	continue;
800644c5 LT	332	}
9938af6a	333	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	334	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	335	continue;
800644c5 LT	336	}
9ad0a933 LT	337	as_is = 1;
	338	if (!show_file(arg))
	339	continue;
4866ccf0 JH	340	if (verify)
4866ccf0 JH	341	die("Needed a single revision");
9ad0a933	342	if (lstat(arg, &st) < 0)
d8f6b342	343	die("'%s': %s", arg, strerror(errno));
023d66ed LT	344	}
023d66ed LT	345	show_default();
4866ccf0 JH	346	if (verify && revs_count != 1)
4866ccf0 JH	347	die("Needed a single revision");
178cb243 LT	348	return 0;
178cb243 LT	349	}