[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"
#include "parse-options.h"

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

static const char *def;

#define NORMAL 0
#define REVERSED 1
static int show_type = NORMAL;

#define SHOW_SYMBOLIC_ASIS 1
#define SHOW_SYMBOLIC_FULL 2
static int symbolic;
static int abbrev;
static int output_sq;

static int revs_count;

/*
 * 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) {
		if (symbolic == SHOW_SYMBOLIC_FULL) {
			unsigned char discard[20];
			char *full;

			switch (dwim_ref(name, strlen(name), discard, &full)) {
			case 0:
				/*
				 * Not found -- not a ref.  We could
				 * emit "name" here, but symbolic-full
				 * users are interested in finding the
				 * refs spelled in full, and they would
				 * need to filter non-refs if we did so.
				 */
				break;
			case 1: /* happy */
				show(full);
				break;
			default: /* ambiguous */
				error("refname '%s' is ambiguous", name);
				break;
			}
		} else {
			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(const 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)
{
	const 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, int flag, void *cb_data)
{
	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;
}

static int try_difference(const char *arg)
{
	char *dotdot;
	unsigned char sha1[20];
	unsigned char end[20];
	const char *next;
	const char *this;
	int symmetric;

	if (!(dotdot = strstr(arg, "..")))
		return 0;
	next = dotdot + 2;
	this = arg;
	symmetric = (*next == '.');

	*dotdot = 0;
	next += symmetric;

	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(symmetric ? NORMAL : REVERSED, sha1, this);
		if (symmetric) {
			struct commit_list *exclude;
			struct commit *a, *b;
			a = lookup_commit_reference(sha1);
			b = lookup_commit_reference(end);
			exclude = get_merge_bases(a, b, 1);
			while (exclude) {
				struct commit_list *n = exclude->next;
				show_rev(REVERSED,
					 exclude->item->object.sha1,NULL);
				free(exclude);
				exclude = n;
			}
		}
		return 1;
	}
	*dotdot = '.';
	return 0;
}

static int parseopt_dump(const struct option *o, const char *arg, int unset)
{
	struct strbuf *parsed = o->value;
	if (unset)
		strbuf_addf(parsed, " --no-%s", o->long_name);
	else if (o->short_name)
		strbuf_addf(parsed, " -%c", o->short_name);
	else
		strbuf_addf(parsed, " --%s", o->long_name);
	if (arg) {
		strbuf_addch(parsed, ' ');
		sq_quote_buf(parsed, arg);
	}
	return 0;
}

static const char *skipspaces(const char *s)
{
	while (isspace(*s))
		s++;
	return s;
}

static int cmd_parseopt(int argc, const char **argv, const char *prefix)
{
	static int keep_dashdash = 0;
	static char const * const parseopt_usage[] = {
		"git-rev-parse --parseopt [options] -- [<args>...]",
		NULL
	};
	static struct option parseopt_opts[] = {
		OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
					"keep the `--` passed as an arg"),
		OPT_END(),
	};

	struct strbuf sb, parsed;
	const char **usage = NULL;
	struct option *opts = NULL;
	int onb = 0, osz = 0, unb = 0, usz = 0;

	strbuf_init(&parsed, 0);
	strbuf_addstr(&parsed, "set --");
	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	                     PARSE_OPT_KEEP_DASHDASH);
	if (argc < 1 || strcmp(argv[0], "--"))
		usage_with_options(parseopt_usage, parseopt_opts);

	strbuf_init(&sb, 0);
	/* get the usage up to the first line with a -- on it */
	for (;;) {
		if (strbuf_getline(&sb, stdin, '\n') == EOF)
			die("premature end of input");
		ALLOC_GROW(usage, unb + 1, usz);
		if (!strcmp("--", sb.buf)) {
			if (unb < 1)
				die("no usage string given before the `--' separator");
			usage[unb] = NULL;
			break;
		}
		usage[unb++] = strbuf_detach(&sb, NULL);
	}

	/* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
		const char *s;
		struct option *o;

		if (!sb.len)
			continue;

		ALLOC_GROW(opts, onb + 1, osz);
		memset(opts + onb, 0, sizeof(opts[onb]));

		o = &opts[onb++];
		s = strchr(sb.buf, ' ');
		if (!s || *sb.buf == ' ') {
			o->type = OPTION_GROUP;
			o->help = xstrdup(skipspaces(sb.buf));
			continue;
		}

		o->type = OPTION_CALLBACK;
		o->help = xstrdup(skipspaces(s));
		o->value = &parsed;
		o->flags = PARSE_OPT_NOARG;
		o->callback = &parseopt_dump;
		while (s > sb.buf && strchr("*=?!", s[-1])) {
			switch (*--s) {
			case '=':
				o->flags &= ~PARSE_OPT_NOARG;
				break;
			case '?':
				o->flags &= ~PARSE_OPT_NOARG;
				o->flags |= PARSE_OPT_OPTARG;
				break;
			case '!':
				o->flags |= PARSE_OPT_NONEG;
				break;
			case '*':
				o->flags |= PARSE_OPT_HIDDEN;
				break;
			}
		}

		if (s - sb.buf == 1) /* short option only */
			o->short_name = *sb.buf;
		else if (sb.buf[1] != ',') /* long option only */
			o->long_name = xmemdupz(sb.buf, s - sb.buf);
		else {
			o->short_name = *sb.buf;
			o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
		}
	}
	strbuf_release(&sb);

	/* put an OPT_END() */
	ALLOC_GROW(opts, onb + 1, osz);
	memset(opts + onb, 0, sizeof(opts[onb]));
	argc = parse_options(argc, argv, opts, usage,
	                     keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);

	strbuf_addf(&parsed, " --");
	sq_quote_argv(&parsed, argv, 0);
	puts(parsed.buf);
	return 0;
}

static void die_no_single_rev(int quiet)
{
	if (quiet)
		exit(1);
	else
		die("Needed a single revision");
}

int cmd_rev_parse(int argc, const char **argv, const char *prefix)
{
	int i, as_is = 0, verify = 0, quiet = 0;
	unsigned char sha1[20];

	if (argc > 1 && !strcmp("--parseopt", argv[1]))
		return cmd_parseopt(argc - 1, argv + 1, prefix);

	prefix = setup_git_directory();
	git_config(git_default_config);
	for (i = 1; i < argc; i++) {
		const char *arg = argv[i];

		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 (!prefixcmp(arg, "-n")) {
			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, "--quiet") || !strcmp(arg, "-q")) {
				quiet = 1;
				continue;
			}
			if (!strcmp(arg, "--short") ||
			    !prefixcmp(arg, "--short=")) {
				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 = SHOW_SYMBOLIC_ASIS;
				continue;
			}
			if (!strcmp(arg, "--symbolic-full-name")) {
				symbolic = SHOW_SYMBOLIC_FULL;
				continue;
			}
			if (!strcmp(arg, "--all")) {
				for_each_ref(show_reference, NULL);
				continue;
			}
			if (!strcmp(arg, "--branches")) {
				for_each_branch_ref(show_reference, NULL);
				continue;
			}
			if (!strcmp(arg, "--tags")) {
				for_each_tag_ref(show_reference, NULL);
				continue;
			}
			if (!strcmp(arg, "--remotes")) {
				for_each_remote_ref(show_reference, NULL);
				continue;
			}
			if (!strcmp(arg, "--show-prefix")) {
				if (prefix)
					puts(prefix);
				continue;
			}
			if (!strcmp(arg, "--show-cdup")) {
				const char *pfx = prefix;
				if (!is_inside_work_tree()) {
					const char *work_tree =
						get_git_work_tree();
					if (work_tree)
						printf("%s\n", work_tree);
					continue;
				}
				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 (!strcmp(arg, "--is-inside-git-dir")) {
				printf("%s\n", is_inside_git_dir() ? "true"
						: "false");
				continue;
			}
			if (!strcmp(arg, "--is-inside-work-tree")) {
				printf("%s\n", is_inside_work_tree() ? "true"
						: "false");
				continue;
			}
			if (!strcmp(arg, "--is-bare-repository")) {
				printf("%s\n", is_bare_repository() ? "true"
						: "false");
				continue;
			}
			if (!prefixcmp(arg, "--since=")) {
				show_datestring("--max-age=", arg+8);
				continue;
			}
			if (!prefixcmp(arg, "--after=")) {
				show_datestring("--max-age=", arg+8);
				continue;
			}
			if (!prefixcmp(arg, "--before=")) {
				show_datestring("--min-age=", arg+9);
				continue;
			}
			if (!prefixcmp(arg, "--until=")) {
				show_datestring("--min-age=", arg+8);
				continue;
			}
			if (show_flag(arg) && verify)
				die_no_single_rev(quiet);
			continue;
		}

		/* Not a flag argument */
		if (try_difference(arg))
			continue;
		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_no_single_rev(quiet);
		as_is = 1;
		if (!show_file(arg))
			continue;
		verify_filename(prefix, arg);
	}
	show_default();
	if (verify && revs_count != 1)
		die_no_single_rev(quiet);
	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"
21d47835	11	#include "parse-options.h"
a8be83fe	12
4866ccf0 JH	13	#define DO_REVS 1
	14	#define DO_NOREV 2
	15	#define DO_FLAGS 4
	16	#define DO_NONFLAGS 8
	17	static int filter = ~0;
	18
96f1e58f	19	static const char *def;
023d66ed	20
042a4ed7 LT	21	#define NORMAL 0
	22	#define REVERSED 1
	23	static int show_type = NORMAL;
a6d97d49 JH	24
	25	#define SHOW_SYMBOLIC_ASIS 1
	26	#define SHOW_SYMBOLIC_FULL 2
96f1e58f DR	27	static int symbolic;
	28	static int abbrev;
	29	static int output_sq;
4866ccf0	30
96f1e58f	31	static int revs_count;
042a4ed7	32
921d865e LT	33	/*
	34	* Some arguments are relevant "revision" arguments,
	35	* others are about output format or other details.
	36	* This sorts it all out.
	37	*/
	38	static int is_rev_argument(const char *arg)
	39	{
	40	static const char *rev_args[] = {
e091eb93	41	"--all",
4866ccf0	42	"--bisect",
5a83f3be	43	"--dense",
a62be77f	44	"--branches",
4866ccf0	45	"--header",
921d865e	46	"--max-age=",
4866ccf0	47	"--max-count=",
4866ccf0	48	"--min-age=",
5ccfb758	49	"--no-merges",
4866ccf0	50	"--objects",
c6496575	51	"--objects-edge",
4866ccf0 JH	52	"--parents",
4866ccf0 JH	53	"--pretty",
a62be77f	54	"--remotes",
5a83f3be	55	"--sparse",
a62be77f	56	"--tags",
4866ccf0	57	"--topo-order",
4c8725f1	58	"--date-order",
4866ccf0	59	"--unpacked",
921d865e LT	60	NULL
	61	};
	62	const char **p = rev_args;
	63
8233340c EW	64	/* accept -<digit>, like traditional "head" */
	65	if ((*arg == '-') && isdigit(arg[1]))
	66	return 1;
	67
921d865e LT	68	for (;;) {
	69	const char str = p++;
	70	int len;
	71	if (!str)
	72	return 0;
	73	len = strlen(str);
4866ccf0 JH	74	if (!strcmp(arg, str) \|\|
4866ccf0 JH	75	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	76	return 1;
	77	}
	78	}
	79
4866ccf0	80	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	81	static void show(const char *arg)
	82	{
	83	if (output_sq) {
	84	int sq = '\'', ch;
	85
	86	putchar(sq);
	87	while ((ch = *arg++)) {
	88	if (ch == sq)
	89	fputs("'\\'", stdout);
	90	putchar(ch);
	91	}
	92	putchar(sq);
	93	putchar(' ');
	94	}
	95	else
	96	puts(arg);
	97	}
	98
4866ccf0	99	/* Output a revision, only if filter allows it */
30b96fce	100	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	101	{
4866ccf0	102	if (!(filter & DO_REVS))
023d66ed	103	return;
4866ccf0 JH	104	def = NULL;
4866ccf0 JH	105	revs_count++;
5bb2c65a	106
30b96fce JH	107	if (type != show_type)
30b96fce JH	108	putchar('^');
a6d97d49 JH	109	if (symbolic && name) {
	110	if (symbolic == SHOW_SYMBOLIC_FULL) {
	111	unsigned char discard[20];
	112	char *full;
	113
	114	switch (dwim_ref(name, strlen(name), discard, &full)) {
	115	case 0:
	116	/*
	117	* Not found -- not a ref. We could
	118	* emit "name" here, but symbolic-full
	119	* users are interested in finding the
	120	* refs spelled in full, and they would
	121	* need to filter non-refs if we did so.
	122	*/
	123	break;
	124	case 1: /* happy */
	125	show(full);
	126	break;
	127	default: /* ambiguous */
	128	error("refname '%s' is ambiguous", name);
	129	break;
	130	}
	131	} else {
	132	show(name);
	133	}
	134	}
d5012508 JH	135	else if (abbrev)
d5012508 JH	136	show(find_unique_abbrev(sha1, abbrev));
30b96fce JH	137	else
30b96fce JH	138	show(sha1_to_hex(sha1));
023d66ed LT	139	}
023d66ed LT	140
4866ccf0	141	/* Output a flag, only if filter allows it. */
16cee38a	142	static int show_flag(const char *arg)
023d66ed	143	{
4866ccf0	144	if (!(filter & DO_FLAGS))
9523a4c2 LT	145	return 0;
9523a4c2 LT	146	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	147	show(arg);
9523a4c2 LT	148	return 1;
	149	}
	150	return 0;
023d66ed LT	151	}
023d66ed LT	152
023d66ed LT	153	static void show_default(void)
023d66ed LT	154	{
16cee38a	155	const char *s = def;
023d66ed LT	156
	157	if (s) {
	158	unsigned char sha1[20];
	159
	160	def = NULL;
9938af6a	161	if (!get_sha1(s, sha1)) {
30b96fce	162	show_rev(NORMAL, sha1, s);
023d66ed LT	163	return;
023d66ed LT	164	}
023d66ed LT	165	}
	166	}
	167
8da19775	168	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	169	{
30b96fce	170	show_rev(NORMAL, sha1, refname);
960bba0d LT	171	return 0;
	172	}
	173
c1babb1d LT	174	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	175	{
c1babb1d	176	static char buffer[100];
c1babb1d LT	177
	178	/* date handling requires both flags and revs */
	179	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	180	return;
3c07b1d1	181	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	182	show(buffer);
	183	}
	184
9ad0a933	185	static int show_file(const char *arg)
7a3dd472	186	{
7b34c2fa	187	show_default();
9ad0a933	188	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	189	show(arg);
9ad0a933 LT	190	return 1;
	191	}
	192	return 0;
7a3dd472 LT	193	}
7a3dd472 LT	194
b7d936b2	195	static int try_difference(const char *arg)
3dd4e732 SB	196	{
	197	char *dotdot;
	198	unsigned char sha1[20];
	199	unsigned char end[20];
	200	const char *next;
	201	const char *this;
	202	int symmetric;
	203
	204	if (!(dotdot = strstr(arg, "..")))
	205	return 0;
	206	next = dotdot + 2;
	207	this = arg;
	208	symmetric = (*next == '.');
	209
	210	*dotdot = 0;
	211	next += symmetric;
	212
	213	if (!*next)
	214	next = "HEAD";
	215	if (dotdot == arg)
	216	this = "HEAD";
	217	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	218	show_rev(NORMAL, end, next);
	219	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	220	if (symmetric) {
	221	struct commit_list *exclude;
	222	struct commit a, b;
	223	a = lookup_commit_reference(sha1);
	224	b = lookup_commit_reference(end);
	225	exclude = get_merge_bases(a, b, 1);
	226	while (exclude) {
	227	struct commit_list *n = exclude->next;
	228	show_rev(REVERSED,
	229	exclude->item->object.sha1,NULL);
	230	free(exclude);
	231	exclude = n;
	232	}
	233	}
	234	return 1;
	235	}
	236	*dotdot = '.';
	237	return 0;
	238	}
	239
21d47835 PH	240	static int parseopt_dump(const struct option o, const char arg, int unset)
	241	{
	242	struct strbuf *parsed = o->value;
	243	if (unset)
	244	strbuf_addf(parsed, " --no-%s", o->long_name);
	245	else if (o->short_name)
	246	strbuf_addf(parsed, " -%c", o->short_name);
	247	else
	248	strbuf_addf(parsed, " --%s", o->long_name);
	249	if (arg) {
	250	strbuf_addch(parsed, ' ');
	251	sq_quote_buf(parsed, arg);
	252	}
	253	return 0;
	254	}
	255
	256	static const char skipspaces(const char s)
	257	{
	258	while (isspace(*s))
	259	s++;
	260	return s;
	261	}
	262
	263	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	264	{
	265	static int keep_dashdash = 0;
	266	static char const * const parseopt_usage[] = {
	267	"git-rev-parse --parseopt [options] -- [<args>...]",
	268	NULL
	269	};
	270	static struct option parseopt_opts[] = {
	271	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	272	"keep the `--` passed as an arg"),
	273	OPT_END(),
	274	};
	275
	276	struct strbuf sb, parsed;
	277	const char **usage = NULL;
	278	struct option *opts = NULL;
	279	int onb = 0, osz = 0, unb = 0, usz = 0;
	280
	281	strbuf_init(&parsed, 0);
	282	strbuf_addstr(&parsed, "set --");
	283	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	284	PARSE_OPT_KEEP_DASHDASH);
	285	if (argc < 1 \|\| strcmp(argv[0], "--"))
	286	usage_with_options(parseopt_usage, parseopt_opts);
	287
	288	strbuf_init(&sb, 0);
	289	/* get the usage up to the first line with a -- on it */
	290	for (;;) {
	291	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	292	die("premature end of input");
	293	ALLOC_GROW(usage, unb + 1, usz);
	294	if (!strcmp("--", sb.buf)) {
	295	if (unb < 1)
	296	die("no usage string given before the `--' separator");
	297	usage[unb] = NULL;
	298	break;
	299	}
	300	usage[unb++] = strbuf_detach(&sb, NULL);
	301	}
	302
	303	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
304	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
305	const char *s;
306	struct option *o;
307
308	if (!sb.len)
309	continue;
310
311	ALLOC_GROW(opts, onb + 1, osz);
312	memset(opts + onb, 0, sizeof(opts[onb]));
313
314	o = &opts[onb++];
315	s = strchr(sb.buf, ' ');
316	if (!s \|\| *sb.buf == ' ') {
317	o->type = OPTION_GROUP;
e1033436	318	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	319	continue;
	320	}
	321
	322	o->type = OPTION_CALLBACK;
	323	o->help = xstrdup(skipspaces(s));
	324	o->value = &parsed;
ff962a3f	325	o->flags = PARSE_OPT_NOARG;
21d47835	326	o->callback = &parseopt_dump;
ff962a3f PH	327	while (s > sb.buf && strchr("*=?!", s[-1])) {
	328	switch (*--s) {
	329	case '=':
	330	o->flags &= ~PARSE_OPT_NOARG;
	331	break;
	332	case '?':
	333	o->flags &= ~PARSE_OPT_NOARG;
	334	o->flags \|= PARSE_OPT_OPTARG;
	335	break;
	336	case '!':
	337	o->flags \|= PARSE_OPT_NONEG;
	338	break;
	339	case '*':
	340	o->flags \|= PARSE_OPT_HIDDEN;
	341	break;
	342	}
21d47835 PH	343	}
	344
	345	if (s - sb.buf == 1) /* short option only */
	346	o->short_name = *sb.buf;
	347	else if (sb.buf[1] != ',') /* long option only */
	348	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	349	else {
	350	o->short_name = *sb.buf;
	351	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	352	}
	353	}
	354	strbuf_release(&sb);
	355
	356	/* put an OPT_END() */
	357	ALLOC_GROW(opts, onb + 1, osz);
	358	memset(opts + onb, 0, sizeof(opts[onb]));
	359	argc = parse_options(argc, argv, opts, usage,
	360	keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
	361
	362	strbuf_addf(&parsed, " --");
b319ce4c	363	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	364	puts(parsed.buf);
	365	return 0;
	366	}
	367
b1b35969 CC	368	static void die_no_single_rev(int quiet)
	369	{
	370	if (quiet)
	371	exit(1);
	372	else
	373	die("Needed a single revision");
	374	}
	375
a633fca0	376	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	377	{
b1b35969	378	int i, as_is = 0, verify = 0, quiet = 0;
178cb243	379	unsigned char sha1[20];
a62be77f	380
21d47835 PH	381	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	382	return cmd_parseopt(argc - 1, argv + 1, prefix);
	383
5410a02a JH	384	prefix = setup_git_directory();
5410a02a JH	385	git_config(git_default_config);
178cb243	386	for (i = 1; i < argc; i++) {
16cee38a	387	const char *arg = argv[i];
fb18a2ed	388
178cb243	389	if (as_is) {
fb18a2ed	390	if (show_file(arg) && as_is < 2)
e23d0b4a	391	verify_filename(prefix, arg);
178cb243 LT	392	continue;
178cb243 LT	393	}
3af06987 EW	394	if (!strcmp(arg,"-n")) {
	395	if (++i >= argc)
	396	die("-n requires an argument");
	397	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	398	show(arg);
	399	show(argv[i]);
	400	}
	401	continue;
	402	}
1968d77d	403	if (!prefixcmp(arg, "-n")) {
3af06987 EW	404	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	405	show(arg);
	406	continue;
	407	}
	408
178cb243 LT	409	if (*arg == '-') {
178cb243 LT	410	if (!strcmp(arg, "--")) {
fb18a2ed	411	as_is = 2;
a08b6505 LT	412	/* Pass on the "--" if we show anything but files.. */
	413	if (filter & (DO_FLAGS \| DO_REVS))
	414	show_file(arg);
4866ccf0	415	continue;
178cb243 LT	416	}
178cb243 LT	417	if (!strcmp(arg, "--default")) {
178cb243 LT	418	def = argv[i+1];
	419	i++;
	420	continue;
	421	}
8ebb0184	422	if (!strcmp(arg, "--revs-only")) {
4866ccf0	423	filter &= ~DO_NOREV;
8ebb0184 LT	424	continue;
	425	}
	426	if (!strcmp(arg, "--no-revs")) {
4866ccf0	427	filter &= ~DO_REVS;
8ebb0184 LT	428	continue;
8ebb0184 LT	429	}
f79b65aa	430	if (!strcmp(arg, "--flags")) {
4866ccf0	431	filter &= ~DO_NONFLAGS;
f79b65aa LT	432	continue;
	433	}
	434	if (!strcmp(arg, "--no-flags")) {
4866ccf0	435	filter &= ~DO_FLAGS;
f79b65aa LT	436	continue;
f79b65aa LT	437	}
023d66ed	438	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	439	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	440	verify = 1;
023d66ed	441	continue;
921d865e	442	}
b1b35969 CC	443	if (!strcmp(arg, "--quiet") \|\| !strcmp(arg, "-q")) {
	444	quiet = 1;
	445	continue;
	446	}
62a604ba	447	if (!strcmp(arg, "--short") \|\|
cc44c765	448	!prefixcmp(arg, "--short=")) {
d5012508 JH	449	filter &= ~(DO_FLAGS\|DO_NOREV);
	450	verify = 1;
	451	abbrev = DEFAULT_ABBREV;
44de0da4 JF	452	if (arg[7] == '=')
44de0da4 JF	453	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	454	if (abbrev < MINIMUM_ABBREV)
	455	abbrev = MINIMUM_ABBREV;
	456	else if (40 <= abbrev)
	457	abbrev = 40;
d5012508 JH	458	continue;
d5012508 JH	459	}
5bb2c65a JH	460	if (!strcmp(arg, "--sq")) {
	461	output_sq = 1;
	462	continue;
	463	}
042a4ed7 LT	464	if (!strcmp(arg, "--not")) {
	465	show_type ^= REVERSED;
	466	continue;
	467	}
30b96fce	468	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	469	symbolic = SHOW_SYMBOLIC_ASIS;
	470	continue;
	471	}
	472	if (!strcmp(arg, "--symbolic-full-name")) {
	473	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	474	continue;
30b96fce JH	475	}
960bba0d	476	if (!strcmp(arg, "--all")) {
cb5d709f	477	for_each_ref(show_reference, NULL);
960bba0d LT	478	continue;
960bba0d LT	479	}
a62be77f	480	if (!strcmp(arg, "--branches")) {
cb5d709f	481	for_each_branch_ref(show_reference, NULL);
a62be77f SE	482	continue;
	483	}
	484	if (!strcmp(arg, "--tags")) {
cb5d709f	485	for_each_tag_ref(show_reference, NULL);
a62be77f SE	486	continue;
	487	}
	488	if (!strcmp(arg, "--remotes")) {
cb5d709f	489	for_each_remote_ref(show_reference, NULL);
a62be77f SE	490	continue;
a62be77f SE	491	}
d288a700	492	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	493	if (prefix)
4866ccf0 JH	494	puts(prefix);
d288a700 LT	495	continue;
d288a700 LT	496	}
5f94c730 JH	497	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	498	const char *pfx = prefix;
e90fdc39 JS	499	if (!is_inside_work_tree()) {
	500	const char *work_tree =
	501	get_git_work_tree();
	502	if (work_tree)
	503	printf("%s\n", work_tree);
	504	continue;
	505	}
5f94c730 JH	506	while (pfx) {
	507	pfx = strchr(pfx, '/');
	508	if (pfx) {
	509	pfx++;
	510	printf("../");
	511	}
	512	}
	513	putchar('\n');
	514	continue;
	515	}
a8783eeb LT	516	if (!strcmp(arg, "--git-dir")) {
	517	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	518	static char cwd[PATH_MAX];
	519	if (gitdir) {
	520	puts(gitdir);
	521	continue;
	522	}
	523	if (!prefix) {
	524	puts(".git");
	525	continue;
	526	}
	527	if (!getcwd(cwd, PATH_MAX))
	528	die("unable to get current working directory");
	529	printf("%s/.git\n", cwd);
	530	continue;
	531	}
6d9ba67b JS	532	if (!strcmp(arg, "--is-inside-git-dir")) {
	533	printf("%s\n", is_inside_git_dir() ? "true"
	534	: "false");
	535	continue;
	536	}
892c41b9 ML	537	if (!strcmp(arg, "--is-inside-work-tree")) {
	538	printf("%s\n", is_inside_work_tree() ? "true"
	539	: "false");
	540	continue;
	541	}
493c774e ML	542	if (!strcmp(arg, "--is-bare-repository")) {
	543	printf("%s\n", is_bare_repository() ? "true"
	544	: "false");
	545	continue;
	546	}
cc44c765	547	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	548	show_datestring("--max-age=", arg+8);
	549	continue;
	550	}
cc44c765	551	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	552	show_datestring("--max-age=", arg+8);
	553	continue;
	554	}
cc44c765	555	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	556	show_datestring("--min-age=", arg+9);
	557	continue;
	558	}
cc44c765	559	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	560	show_datestring("--min-age=", arg+8);
	561	continue;
	562	}
9523a4c2	563	if (show_flag(arg) && verify)
b1b35969	564	die_no_single_rev(quiet);
178cb243 LT	565	continue;
178cb243 LT	566	}
4866ccf0 JH	567
4866ccf0 JH	568	/* Not a flag argument */
3dd4e732 SB	569	if (try_difference(arg))
3dd4e732 SB	570	continue;
9938af6a	571	if (!get_sha1(arg, sha1)) {
30b96fce	572	show_rev(NORMAL, sha1, arg);
800644c5 LT	573	continue;
800644c5 LT	574	}
9938af6a	575	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	576	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	577	continue;
800644c5 LT	578	}
75ecfce3 CC	579	if (verify)
75ecfce3 CC	580	die_no_single_rev(quiet);
9ad0a933 LT	581	as_is = 1;
	582	if (!show_file(arg))
	583	continue;
e23d0b4a	584	verify_filename(prefix, arg);
023d66ed LT	585	}
023d66ed LT	586	show_default();
4866ccf0	587	if (verify && revs_count != 1)
b1b35969	588	die_no_single_rev(quiet);
178cb243 LT	589	return 0;
178cb243 LT	590	}