[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();
	
	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
178cb243	169	for (i = 1; i < argc; i++) {
d8f6b342	170	struct stat st;
178cb243 LT	171	char *arg = argv[i];
	172	char *dotdot;
	173
	174	if (as_is) {
7a3dd472	175	show_file(arg);
178cb243 LT	176	continue;
178cb243 LT	177	}
3af06987 EW	178	if (!strcmp(arg,"-n")) {
	179	if (++i >= argc)
	180	die("-n requires an argument");
	181	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	182	show(arg);
	183	show(argv[i]);
	184	}
	185	continue;
	186	}
	187	if (!strncmp(arg,"-n",2)) {
	188	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	189	show(arg);
	190	continue;
	191	}
	192
178cb243 LT	193	if (*arg == '-') {
178cb243 LT	194	if (!strcmp(arg, "--")) {
178cb243	195	as_is = 1;
a08b6505 LT	196	/* Pass on the "--" if we show anything but files.. */
	197	if (filter & (DO_FLAGS \| DO_REVS))
	198	show_file(arg);
4866ccf0	199	continue;
178cb243 LT	200	}
178cb243 LT	201	if (!strcmp(arg, "--default")) {
178cb243 LT	202	def = argv[i+1];
	203	i++;
	204	continue;
	205	}
8ebb0184	206	if (!strcmp(arg, "--revs-only")) {
4866ccf0	207	filter &= ~DO_NOREV;
8ebb0184 LT	208	continue;
	209	}
	210	if (!strcmp(arg, "--no-revs")) {
4866ccf0	211	filter &= ~DO_REVS;
8ebb0184 LT	212	continue;
8ebb0184 LT	213	}
f79b65aa	214	if (!strcmp(arg, "--flags")) {
4866ccf0	215	filter &= ~DO_NONFLAGS;
f79b65aa LT	216	continue;
	217	}
	218	if (!strcmp(arg, "--no-flags")) {
4866ccf0	219	filter &= ~DO_FLAGS;
f79b65aa LT	220	continue;
f79b65aa LT	221	}
023d66ed	222	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	223	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	224	verify = 1;
023d66ed	225	continue;
921d865e	226	}
62a604ba	227	if (!strcmp(arg, "--short") \|\|
44de0da4	228	!strncmp(arg, "--short=", 8)) {
d5012508 JH	229	filter &= ~(DO_FLAGS\|DO_NOREV);
	230	verify = 1;
	231	abbrev = DEFAULT_ABBREV;
44de0da4 JF	232	if (arg[7] == '=')
44de0da4 JF	233	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	234	if (abbrev < MINIMUM_ABBREV)
	235	abbrev = MINIMUM_ABBREV;
	236	else if (40 <= abbrev)
	237	abbrev = 40;
d5012508 JH	238	continue;
d5012508 JH	239	}
5bb2c65a JH	240	if (!strcmp(arg, "--sq")) {
	241	output_sq = 1;
	242	continue;
	243	}
042a4ed7 LT	244	if (!strcmp(arg, "--not")) {
	245	show_type ^= REVERSED;
	246	continue;
	247	}
30b96fce JH	248	if (!strcmp(arg, "--symbolic")) {
	249	symbolic = 1;
	250	continue;
	251	}
960bba0d LT	252	if (!strcmp(arg, "--all")) {
	253	for_each_ref(show_reference);
	254	continue;
	255	}
d288a700	256	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	257	if (prefix)
4866ccf0 JH	258	puts(prefix);
d288a700 LT	259	continue;
d288a700 LT	260	}
5f94c730 JH	261	if (!strcmp(arg, "--show-cdup")) {
	262	const char *pfx = prefix;
	263	while (pfx) {
	264	pfx = strchr(pfx, '/');
	265	if (pfx) {
	266	pfx++;
	267	printf("../");
	268	}
	269	}
	270	putchar('\n');
	271	continue;
	272	}
a8783eeb LT	273	if (!strcmp(arg, "--git-dir")) {
	274	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	275	static char cwd[PATH_MAX];
	276	if (gitdir) {
	277	puts(gitdir);
	278	continue;
	279	}
	280	if (!prefix) {
	281	puts(".git");
	282	continue;
	283	}
	284	if (!getcwd(cwd, PATH_MAX))
	285	die("unable to get current working directory");
	286	printf("%s/.git\n", cwd);
	287	continue;
	288	}
c1babb1d LT	289	if (!strncmp(arg, "--since=", 8)) {
	290	show_datestring("--max-age=", arg+8);
	291	continue;
	292	}
	293	if (!strncmp(arg, "--after=", 8)) {
	294	show_datestring("--max-age=", arg+8);
	295	continue;
	296	}
	297	if (!strncmp(arg, "--before=", 9)) {
	298	show_datestring("--min-age=", arg+9);
	299	continue;
	300	}
	301	if (!strncmp(arg, "--until=", 8)) {
	302	show_datestring("--min-age=", arg+8);
	303	continue;
	304	}
9523a4c2	305	if (show_flag(arg) && verify)
4866ccf0	306	die("Needed a single revision");
178cb243 LT	307	continue;
178cb243 LT	308	}
4866ccf0 JH	309
4866ccf0 JH	310	/* Not a flag argument */
178cb243 LT	311	dotdot = strstr(arg, "..");
	312	if (dotdot) {
	313	unsigned char end[20];
	314	char *n = dotdot+2;
	315	*dotdot = 0;
9938af6a	316	if (!get_sha1(arg, sha1)) {
178cb243 LT	317	if (!*n)
178cb243 LT	318	n = "HEAD";
9938af6a	319	if (!get_sha1(n, end)) {
30b96fce JH	320	show_rev(NORMAL, end, n);
30b96fce JH	321	show_rev(REVERSED, sha1, arg);
178cb243 LT	322	continue;
	323	}
	324	}
	325	*dotdot = '.';
	326	}
9938af6a	327	if (!get_sha1(arg, sha1)) {
30b96fce	328	show_rev(NORMAL, sha1, arg);
800644c5 LT	329	continue;
800644c5 LT	330	}
9938af6a	331	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	332	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	333	continue;
800644c5 LT	334	}
9ad0a933 LT	335	as_is = 1;
	336	if (!show_file(arg))
	337	continue;
4866ccf0 JH	338	if (verify)
4866ccf0 JH	339	die("Needed a single revision");
9ad0a933	340	if (lstat(arg, &st) < 0)
d8f6b342	341	die("'%s': %s", arg, strerror(errno));
023d66ed LT	342	}
023d66ed LT	343	show_default();
4866ccf0 JH	344	if (verify && revs_count != 1)
4866ccf0 JH	345	die("Needed a single revision");
178cb243 LT	346	return 0;
178cb243 LT	347	}