[git/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=",
		"--merge-order",
		"--min-age=",
		"--no-merges",
		"--objects",
		"--parents",
		"--pretty",
		"--show-breaks",
		"--sparse",
		"--topo-order",
		"--unpacked",
		NULL
	};
	const char **p = rev_args;

	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 void show_flag(char *arg)
{
	if (!(filter & DO_FLAGS))
		return;
	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
		show(arg);
}

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 void show_file(const char *arg)
{
	show_default();
	if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
		show(arg);
}

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=", 9)) {
				filter &= ~(DO_FLAGS|DO_NOREV);
				verify = 1;
				abbrev = DEFAULT_ABBREV;
				if (arg[8] == '=')
					abbrev = strtoul(arg + 9, 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 (verify)
				die("Needed a single revision");
			show_flag(arg);
			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;
		}
		if (verify)
			die("Needed a single revision");
		if ((filter & DO_REVS) &&
		    (filter & DO_NONFLAGS) && /* !def && */
		    lstat(arg, &st) < 0)
			die("'%s': %s", arg, strerror(errno));
		as_is = 1;
		show_file(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"
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=",
921d865e	42	"--merge-order",
4866ccf0	43	"--min-age=",
5ccfb758	44	"--no-merges",
4866ccf0 JH	45	"--objects",
	46	"--parents",
	47	"--pretty",
	48	"--show-breaks",
5a83f3be	49	"--sparse",
4866ccf0 JH	50	"--topo-order",
4866ccf0 JH	51	"--unpacked",
921d865e LT	52	NULL
	53	};
	54	const char **p = rev_args;
	55
	56	for (;;) {
	57	const char str = p++;
	58	int len;
	59	if (!str)
	60	return 0;
	61	len = strlen(str);
4866ccf0 JH	62	if (!strcmp(arg, str) \|\|
4866ccf0 JH	63	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	64	return 1;
	65	}
	66	}
	67
4866ccf0	68	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	69	static void show(const char *arg)
	70	{
	71	if (output_sq) {
	72	int sq = '\'', ch;
	73
	74	putchar(sq);
	75	while ((ch = *arg++)) {
	76	if (ch == sq)
	77	fputs("'\\'", stdout);
	78	putchar(ch);
	79	}
	80	putchar(sq);
	81	putchar(' ');
	82	}
	83	else
	84	puts(arg);
	85	}
	86
4866ccf0	87	/* Output a revision, only if filter allows it */
30b96fce	88	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	89	{
4866ccf0	90	if (!(filter & DO_REVS))
023d66ed	91	return;
4866ccf0 JH	92	def = NULL;
4866ccf0 JH	93	revs_count++;
5bb2c65a	94
30b96fce JH	95	if (type != show_type)
	96	putchar('^');
	97	if (symbolic && name)
	98	show(name);
d5012508 JH	99	else if (abbrev)
d5012508 JH	100	show(find_unique_abbrev(sha1, abbrev));
30b96fce JH	101	else
30b96fce JH	102	show(sha1_to_hex(sha1));
023d66ed LT	103	}
023d66ed LT	104
4866ccf0 JH	105	/* Output a flag, only if filter allows it. */
4866ccf0 JH	106	static void show_flag(char *arg)
023d66ed	107	{
4866ccf0	108	if (!(filter & DO_FLAGS))
023d66ed	109	return;
4866ccf0	110	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
0360e99d	111	show(arg);
023d66ed LT	112	}
023d66ed LT	113
023d66ed LT	114	static void show_default(void)
	115	{
	116	char *s = def;
	117
	118	if (s) {
	119	unsigned char sha1[20];
	120
	121	def = NULL;
9938af6a	122	if (!get_sha1(s, sha1)) {
30b96fce	123	show_rev(NORMAL, sha1, s);
023d66ed LT	124	return;
023d66ed LT	125	}
023d66ed LT	126	}
	127	}
	128
960bba0d LT	129	static int show_reference(const char refname, const unsigned char sha1)
960bba0d LT	130	{
30b96fce	131	show_rev(NORMAL, sha1, refname);
960bba0d LT	132	return 0;
	133	}
	134
c1babb1d LT	135	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	136	{
c1babb1d	137	static char buffer[100];
c1babb1d LT	138
	139	/* date handling requires both flags and revs */
	140	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	141	return;
3c07b1d1	142	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	143	show(buffer);
	144	}
	145
7a3dd472 LT	146	static void show_file(const char *arg)
7a3dd472 LT	147	{
7b34c2fa	148	show_default();
7a3dd472 LT	149	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV))
	150	show(arg);
	151	}
	152
178cb243 LT	153	int main(int argc, char **argv)
178cb243 LT	154	{
4866ccf0	155	int i, as_is = 0, verify = 0;
178cb243	156	unsigned char sha1[20];
d288a700 LT	157	const char *prefix = setup_git_directory();
d288a700 LT	158
178cb243	159	for (i = 1; i < argc; i++) {
d8f6b342	160	struct stat st;
178cb243 LT	161	char *arg = argv[i];
	162	char *dotdot;
	163
	164	if (as_is) {
7a3dd472	165	show_file(arg);
178cb243 LT	166	continue;
178cb243 LT	167	}
3af06987 EW	168	if (!strcmp(arg,"-n")) {
	169	if (++i >= argc)
	170	die("-n requires an argument");
	171	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	172	show(arg);
	173	show(argv[i]);
	174	}
	175	continue;
	176	}
	177	if (!strncmp(arg,"-n",2)) {
	178	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	179	show(arg);
	180	continue;
	181	}
	182
178cb243 LT	183	if (*arg == '-') {
178cb243 LT	184	if (!strcmp(arg, "--")) {
178cb243	185	as_is = 1;
a08b6505 LT	186	/* Pass on the "--" if we show anything but files.. */
	187	if (filter & (DO_FLAGS \| DO_REVS))
	188	show_file(arg);
4866ccf0	189	continue;
178cb243 LT	190	}
178cb243 LT	191	if (!strcmp(arg, "--default")) {
178cb243 LT	192	def = argv[i+1];
	193	i++;
	194	continue;
	195	}
8ebb0184	196	if (!strcmp(arg, "--revs-only")) {
4866ccf0	197	filter &= ~DO_NOREV;
8ebb0184 LT	198	continue;
	199	}
	200	if (!strcmp(arg, "--no-revs")) {
4866ccf0	201	filter &= ~DO_REVS;
8ebb0184 LT	202	continue;
8ebb0184 LT	203	}
f79b65aa	204	if (!strcmp(arg, "--flags")) {
4866ccf0	205	filter &= ~DO_NONFLAGS;
f79b65aa LT	206	continue;
	207	}
	208	if (!strcmp(arg, "--no-flags")) {
4866ccf0	209	filter &= ~DO_FLAGS;
f79b65aa LT	210	continue;
f79b65aa LT	211	}
023d66ed	212	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	213	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	214	verify = 1;
023d66ed	215	continue;
921d865e	216	}
62a604ba JH	217	if (!strcmp(arg, "--short") \|\|
62a604ba JH	218	!strncmp(arg, "--short=", 9)) {
d5012508 JH	219	filter &= ~(DO_FLAGS\|DO_NOREV);
	220	verify = 1;
	221	abbrev = DEFAULT_ABBREV;
	222	if (arg[8] == '=')
	223	abbrev = strtoul(arg + 9, NULL, 10);
1dc4fb84 JH	224	if (abbrev < MINIMUM_ABBREV)
	225	abbrev = MINIMUM_ABBREV;
	226	else if (40 <= abbrev)
	227	abbrev = 40;
d5012508 JH	228	continue;
d5012508 JH	229	}
5bb2c65a JH	230	if (!strcmp(arg, "--sq")) {
	231	output_sq = 1;
	232	continue;
	233	}
042a4ed7 LT	234	if (!strcmp(arg, "--not")) {
	235	show_type ^= REVERSED;
	236	continue;
	237	}
30b96fce JH	238	if (!strcmp(arg, "--symbolic")) {
	239	symbolic = 1;
	240	continue;
	241	}
960bba0d LT	242	if (!strcmp(arg, "--all")) {
	243	for_each_ref(show_reference);
	244	continue;
	245	}
d288a700	246	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	247	if (prefix)
4866ccf0 JH	248	puts(prefix);
d288a700 LT	249	continue;
d288a700 LT	250	}
5f94c730 JH	251	if (!strcmp(arg, "--show-cdup")) {
	252	const char *pfx = prefix;
	253	while (pfx) {
	254	pfx = strchr(pfx, '/');
	255	if (pfx) {
	256	pfx++;
	257	printf("../");
	258	}
	259	}
	260	putchar('\n');
	261	continue;
	262	}
a8783eeb LT	263	if (!strcmp(arg, "--git-dir")) {
	264	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	265	static char cwd[PATH_MAX];
	266	if (gitdir) {
	267	puts(gitdir);
	268	continue;
	269	}
	270	if (!prefix) {
	271	puts(".git");
	272	continue;
	273	}
	274	if (!getcwd(cwd, PATH_MAX))
	275	die("unable to get current working directory");
	276	printf("%s/.git\n", cwd);
	277	continue;
	278	}
c1babb1d LT	279	if (!strncmp(arg, "--since=", 8)) {
	280	show_datestring("--max-age=", arg+8);
	281	continue;
	282	}
	283	if (!strncmp(arg, "--after=", 8)) {
	284	show_datestring("--max-age=", arg+8);
	285	continue;
	286	}
	287	if (!strncmp(arg, "--before=", 9)) {
	288	show_datestring("--min-age=", arg+9);
	289	continue;
	290	}
	291	if (!strncmp(arg, "--until=", 8)) {
	292	show_datestring("--min-age=", arg+8);
	293	continue;
	294	}
4866ccf0 JH	295	if (verify)
	296	die("Needed a single revision");
	297	show_flag(arg);
178cb243 LT	298	continue;
178cb243 LT	299	}
4866ccf0 JH	300
4866ccf0 JH	301	/* Not a flag argument */
178cb243 LT	302	dotdot = strstr(arg, "..");
	303	if (dotdot) {
	304	unsigned char end[20];
	305	char *n = dotdot+2;
	306	*dotdot = 0;
9938af6a	307	if (!get_sha1(arg, sha1)) {
178cb243 LT	308	if (!*n)
178cb243 LT	309	n = "HEAD";
9938af6a	310	if (!get_sha1(n, end)) {
30b96fce JH	311	show_rev(NORMAL, end, n);
30b96fce JH	312	show_rev(REVERSED, sha1, arg);
178cb243 LT	313	continue;
	314	}
	315	}
	316	*dotdot = '.';
	317	}
9938af6a	318	if (!get_sha1(arg, sha1)) {
30b96fce	319	show_rev(NORMAL, sha1, arg);
800644c5 LT	320	continue;
800644c5 LT	321	}
9938af6a	322	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	323	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	324	continue;
800644c5 LT	325	}
4866ccf0 JH	326	if (verify)
4866ccf0 JH	327	die("Needed a single revision");
b33aba51 JH	328	if ((filter & DO_REVS) &&
	329	(filter & DO_NONFLAGS) && /* !def && */
	330	lstat(arg, &st) < 0)
d8f6b342	331	die("'%s': %s", arg, strerror(errno));
af13cdf2	332	as_is = 1;
7a3dd472	333	show_file(arg);
023d66ed LT	334	}
023d66ed LT	335	show_default();
4866ccf0 JH	336	if (verify && revs_count != 1)
4866ccf0 JH	337	die("Needed a single revision");
178cb243 LT	338	return 0;
178cb243 LT	339	}