[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 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(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 cmd_rev_parse(int argc, const char **argv, char **envp)
{
	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++) {
		char *arg = argv[i];
		char *dotdot;

		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 */
		dotdot = strstr(arg, "..");
		if (dotdot) {
			unsigned char end[20];
			char *next = dotdot + 2;
			char *this = arg;
			*dotdot = 0;
			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(REVERSED, sha1, this);
				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");
		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
023d66ed	18	static 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. */
9523a4c2	114	static int show_flag(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)
	126	{
	127	char *s = def;
	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
895f10c3	167	int cmd_rev_parse(int argc, const char argv, char envp)
178cb243	168	{
4866ccf0	169	int i, as_is = 0, verify = 0;
178cb243	170	unsigned char sha1[20];
d288a700	171	const char *prefix = setup_git_directory();
a62be77f	172
84a9b58c JH	173	git_config(git_default_config);
84a9b58c JH	174
178cb243 LT	175	for (i = 1; i < argc; i++) {
	176	char *arg = argv[i];
	177	char *dotdot;
fb18a2ed	178
178cb243	179	if (as_is) {
fb18a2ed	180	if (show_file(arg) && as_is < 2)
e23d0b4a	181	verify_filename(prefix, arg);
178cb243 LT	182	continue;
178cb243 LT	183	}
3af06987 EW	184	if (!strcmp(arg,"-n")) {
	185	if (++i >= argc)
	186	die("-n requires an argument");
	187	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	188	show(arg);
	189	show(argv[i]);
	190	}
	191	continue;
	192	}
	193	if (!strncmp(arg,"-n",2)) {
	194	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	195	show(arg);
	196	continue;
	197	}
	198
178cb243 LT	199	if (*arg == '-') {
178cb243 LT	200	if (!strcmp(arg, "--")) {
fb18a2ed	201	as_is = 2;
a08b6505 LT	202	/* Pass on the "--" if we show anything but files.. */
	203	if (filter & (DO_FLAGS \| DO_REVS))
	204	show_file(arg);
4866ccf0	205	continue;
178cb243 LT	206	}
178cb243 LT	207	if (!strcmp(arg, "--default")) {
178cb243 LT	208	def = argv[i+1];
	209	i++;
	210	continue;
	211	}
8ebb0184	212	if (!strcmp(arg, "--revs-only")) {
4866ccf0	213	filter &= ~DO_NOREV;
8ebb0184 LT	214	continue;
	215	}
	216	if (!strcmp(arg, "--no-revs")) {
4866ccf0	217	filter &= ~DO_REVS;
8ebb0184 LT	218	continue;
8ebb0184 LT	219	}
f79b65aa	220	if (!strcmp(arg, "--flags")) {
4866ccf0	221	filter &= ~DO_NONFLAGS;
f79b65aa LT	222	continue;
	223	}
	224	if (!strcmp(arg, "--no-flags")) {
4866ccf0	225	filter &= ~DO_FLAGS;
f79b65aa LT	226	continue;
f79b65aa LT	227	}
023d66ed	228	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	229	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	230	verify = 1;
023d66ed	231	continue;
921d865e	232	}
62a604ba	233	if (!strcmp(arg, "--short") \|\|
44de0da4	234	!strncmp(arg, "--short=", 8)) {
d5012508 JH	235	filter &= ~(DO_FLAGS\|DO_NOREV);
	236	verify = 1;
	237	abbrev = DEFAULT_ABBREV;
44de0da4 JF	238	if (arg[7] == '=')
44de0da4 JF	239	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	240	if (abbrev < MINIMUM_ABBREV)
	241	abbrev = MINIMUM_ABBREV;
	242	else if (40 <= abbrev)
	243	abbrev = 40;
d5012508 JH	244	continue;
d5012508 JH	245	}
5bb2c65a JH	246	if (!strcmp(arg, "--sq")) {
	247	output_sq = 1;
	248	continue;
	249	}
042a4ed7 LT	250	if (!strcmp(arg, "--not")) {
	251	show_type ^= REVERSED;
	252	continue;
	253	}
30b96fce JH	254	if (!strcmp(arg, "--symbolic")) {
	255	symbolic = 1;
	256	continue;
	257	}
960bba0d LT	258	if (!strcmp(arg, "--all")) {
	259	for_each_ref(show_reference);
	260	continue;
	261	}
a62be77f SE	262	if (!strcmp(arg, "--branches")) {
	263	for_each_branch_ref(show_reference);
	264	continue;
	265	}
	266	if (!strcmp(arg, "--tags")) {
	267	for_each_tag_ref(show_reference);
	268	continue;
	269	}
	270	if (!strcmp(arg, "--remotes")) {
	271	for_each_remote_ref(show_reference);
	272	continue;
	273	}
d288a700	274	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	275	if (prefix)
4866ccf0 JH	276	puts(prefix);
d288a700 LT	277	continue;
d288a700 LT	278	}
5f94c730 JH	279	if (!strcmp(arg, "--show-cdup")) {
	280	const char *pfx = prefix;
	281	while (pfx) {
	282	pfx = strchr(pfx, '/');
	283	if (pfx) {
	284	pfx++;
	285	printf("../");
	286	}
	287	}
	288	putchar('\n');
	289	continue;
	290	}
a8783eeb LT	291	if (!strcmp(arg, "--git-dir")) {
	292	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	293	static char cwd[PATH_MAX];
	294	if (gitdir) {
	295	puts(gitdir);
	296	continue;
	297	}
	298	if (!prefix) {
	299	puts(".git");
	300	continue;
	301	}
	302	if (!getcwd(cwd, PATH_MAX))
	303	die("unable to get current working directory");
	304	printf("%s/.git\n", cwd);
	305	continue;
	306	}
c1babb1d LT	307	if (!strncmp(arg, "--since=", 8)) {
	308	show_datestring("--max-age=", arg+8);
	309	continue;
	310	}
	311	if (!strncmp(arg, "--after=", 8)) {
	312	show_datestring("--max-age=", arg+8);
	313	continue;
	314	}
	315	if (!strncmp(arg, "--before=", 9)) {
	316	show_datestring("--min-age=", arg+9);
	317	continue;
	318	}
	319	if (!strncmp(arg, "--until=", 8)) {
	320	show_datestring("--min-age=", arg+8);
	321	continue;
	322	}
9523a4c2	323	if (show_flag(arg) && verify)
4866ccf0	324	die("Needed a single revision");
178cb243 LT	325	continue;
178cb243 LT	326	}
4866ccf0 JH	327
4866ccf0 JH	328	/* Not a flag argument */
178cb243 LT	329	dotdot = strstr(arg, "..");
	330	if (dotdot) {
	331	unsigned char end[20];
ce4a7063 JH	332	char *next = dotdot + 2;
ce4a7063 JH	333	char *this = arg;
178cb243	334	*dotdot = 0;
ce4a7063 JH	335	if (!*next)
	336	next = "HEAD";
	337	if (dotdot == arg)
	338	this = "HEAD";
	339	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	340	show_rev(NORMAL, end, next);
	341	show_rev(REVERSED, sha1, this);
	342	continue;
178cb243 LT	343	}
	344	*dotdot = '.';
	345	}
9938af6a	346	if (!get_sha1(arg, sha1)) {
30b96fce	347	show_rev(NORMAL, sha1, arg);
800644c5 LT	348	continue;
800644c5 LT	349	}
9938af6a	350	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	351	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	352	continue;
800644c5 LT	353	}
9ad0a933 LT	354	as_is = 1;
	355	if (!show_file(arg))
	356	continue;
4866ccf0 JH	357	if (verify)
4866ccf0 JH	358	die("Needed a single revision");
e23d0b4a	359	verify_filename(prefix, arg);
023d66ed LT	360	}
023d66ed LT	361	show_default();
4866ccf0 JH	362	if (verify && revs_count != 1)
4866ccf0 JH	363	die("Needed a single revision");
178cb243 LT	364	return 0;
178cb243 LT	365	}