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