[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;

/*
 * 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;

	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 int 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 1;
		}
	}
	return 0;
}

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, revs_count = 0, type = 0;
	unsigned char sha1[20];
	const char *name = NULL;

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

	prefix = setup_git_directory();
	git_config(git_default_config, NULL);
	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;
		name = arg;
		type = NORMAL;
		if (*arg == '^') {
			name++;
			type = REVERSED;
		}
		if (!get_sha1(name, sha1)) {
			if (verify)
				revs_count++;
			else
				show_rev(type, sha1, name);
			continue;
		}
		if (verify)
			die_no_single_rev(quiet);
		as_is = 1;
		if (!show_file(arg))
			continue;
		verify_filename(prefix, arg);
	}
	if (verify) {
		if (revs_count == 1) {
			show_rev(type, sha1, name);
			return 0;
		} else if (revs_count == 0 && show_default())
			return 0;
		die_no_single_rev(quiet);
	} else
		show_default();
	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
921d865e LT	31	/*
	32	* Some arguments are relevant "revision" arguments,
	33	* others are about output format or other details.
	34	* This sorts it all out.
	35	*/
	36	static int is_rev_argument(const char *arg)
	37	{
	38	static const char *rev_args[] = {
e091eb93	39	"--all",
4866ccf0	40	"--bisect",
5a83f3be	41	"--dense",
a62be77f	42	"--branches",
4866ccf0	43	"--header",
921d865e	44	"--max-age=",
4866ccf0	45	"--max-count=",
4866ccf0	46	"--min-age=",
5ccfb758	47	"--no-merges",
4866ccf0	48	"--objects",
c6496575	49	"--objects-edge",
4866ccf0 JH	50	"--parents",
4866ccf0 JH	51	"--pretty",
a62be77f	52	"--remotes",
5a83f3be	53	"--sparse",
a62be77f	54	"--tags",
4866ccf0	55	"--topo-order",
4c8725f1	56	"--date-order",
4866ccf0	57	"--unpacked",
921d865e LT	58	NULL
	59	};
	60	const char **p = rev_args;
	61
8233340c EW	62	/* accept -<digit>, like traditional "head" */
	63	if ((*arg == '-') && isdigit(arg[1]))
	64	return 1;
	65
921d865e LT	66	for (;;) {
	67	const char str = p++;
	68	int len;
	69	if (!str)
	70	return 0;
	71	len = strlen(str);
4866ccf0 JH	72	if (!strcmp(arg, str) \|\|
4866ccf0 JH	73	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	74	return 1;
	75	}
	76	}
	77
4866ccf0	78	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	79	static void show(const char *arg)
	80	{
	81	if (output_sq) {
	82	int sq = '\'', ch;
	83
	84	putchar(sq);
	85	while ((ch = *arg++)) {
	86	if (ch == sq)
	87	fputs("'\\'", stdout);
	88	putchar(ch);
	89	}
	90	putchar(sq);
	91	putchar(' ');
	92	}
	93	else
	94	puts(arg);
	95	}
	96
4866ccf0	97	/* Output a revision, only if filter allows it */
30b96fce	98	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	99	{
4866ccf0	100	if (!(filter & DO_REVS))
023d66ed	101	return;
4866ccf0	102	def = NULL;
5bb2c65a	103
30b96fce JH	104	if (type != show_type)
30b96fce JH	105	putchar('^');
a6d97d49 JH	106	if (symbolic && name) {
	107	if (symbolic == SHOW_SYMBOLIC_FULL) {
	108	unsigned char discard[20];
	109	char *full;
	110
	111	switch (dwim_ref(name, strlen(name), discard, &full)) {
	112	case 0:
	113	/*
	114	* Not found -- not a ref. We could
	115	* emit "name" here, but symbolic-full
	116	* users are interested in finding the
	117	* refs spelled in full, and they would
	118	* need to filter non-refs if we did so.
	119	*/
	120	break;
	121	case 1: /* happy */
	122	show(full);
	123	break;
	124	default: /* ambiguous */
	125	error("refname '%s' is ambiguous", name);
	126	break;
	127	}
	128	} else {
	129	show(name);
	130	}
	131	}
d5012508 JH	132	else if (abbrev)
d5012508 JH	133	show(find_unique_abbrev(sha1, abbrev));
30b96fce JH	134	else
30b96fce JH	135	show(sha1_to_hex(sha1));
023d66ed LT	136	}
023d66ed LT	137
4866ccf0	138	/* Output a flag, only if filter allows it. */
16cee38a	139	static int show_flag(const char *arg)
023d66ed	140	{
4866ccf0	141	if (!(filter & DO_FLAGS))
9523a4c2 LT	142	return 0;
9523a4c2 LT	143	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	144	show(arg);
9523a4c2 LT	145	return 1;
	146	}
	147	return 0;
023d66ed LT	148	}
023d66ed LT	149
dfd1b749	150	static int show_default(void)
023d66ed	151	{
16cee38a	152	const char *s = def;
023d66ed LT	153
	154	if (s) {
	155	unsigned char sha1[20];
	156
	157	def = NULL;
9938af6a	158	if (!get_sha1(s, sha1)) {
30b96fce	159	show_rev(NORMAL, sha1, s);
dfd1b749	160	return 1;
023d66ed	161	}
023d66ed	162	}
dfd1b749	163	return 0;
023d66ed LT	164	}
023d66ed LT	165
8da19775	166	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	167	{
30b96fce	168	show_rev(NORMAL, sha1, refname);
960bba0d LT	169	return 0;
	170	}
	171
c1babb1d LT	172	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	173	{
c1babb1d	174	static char buffer[100];
c1babb1d LT	175
	176	/* date handling requires both flags and revs */
	177	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	178	return;
3c07b1d1	179	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	180	show(buffer);
	181	}
	182
9ad0a933	183	static int show_file(const char *arg)
7a3dd472	184	{
7b34c2fa	185	show_default();
9ad0a933	186	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	187	show(arg);
9ad0a933 LT	188	return 1;
	189	}
	190	return 0;
7a3dd472 LT	191	}
7a3dd472 LT	192
b7d936b2	193	static int try_difference(const char *arg)
3dd4e732 SB	194	{
	195	char *dotdot;
	196	unsigned char sha1[20];
	197	unsigned char end[20];
	198	const char *next;
	199	const char *this;
	200	int symmetric;
	201
	202	if (!(dotdot = strstr(arg, "..")))
	203	return 0;
	204	next = dotdot + 2;
	205	this = arg;
	206	symmetric = (*next == '.');
	207
	208	*dotdot = 0;
	209	next += symmetric;
	210
	211	if (!*next)
	212	next = "HEAD";
	213	if (dotdot == arg)
	214	this = "HEAD";
	215	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	216	show_rev(NORMAL, end, next);
	217	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	218	if (symmetric) {
	219	struct commit_list *exclude;
	220	struct commit a, b;
	221	a = lookup_commit_reference(sha1);
	222	b = lookup_commit_reference(end);
	223	exclude = get_merge_bases(a, b, 1);
	224	while (exclude) {
	225	struct commit_list *n = exclude->next;
	226	show_rev(REVERSED,
	227	exclude->item->object.sha1,NULL);
	228	free(exclude);
	229	exclude = n;
	230	}
	231	}
	232	return 1;
	233	}
	234	*dotdot = '.';
	235	return 0;
	236	}
	237
21d47835 PH	238	static int parseopt_dump(const struct option o, const char arg, int unset)
	239	{
	240	struct strbuf *parsed = o->value;
	241	if (unset)
	242	strbuf_addf(parsed, " --no-%s", o->long_name);
	243	else if (o->short_name)
	244	strbuf_addf(parsed, " -%c", o->short_name);
	245	else
	246	strbuf_addf(parsed, " --%s", o->long_name);
	247	if (arg) {
	248	strbuf_addch(parsed, ' ');
	249	sq_quote_buf(parsed, arg);
	250	}
	251	return 0;
	252	}
	253
	254	static const char skipspaces(const char s)
	255	{
	256	while (isspace(*s))
	257	s++;
	258	return s;
	259	}
	260
	261	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	262	{
	263	static int keep_dashdash = 0;
	264	static char const * const parseopt_usage[] = {
	265	"git-rev-parse --parseopt [options] -- [<args>...]",
	266	NULL
	267	};
	268	static struct option parseopt_opts[] = {
	269	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	270	"keep the `--` passed as an arg"),
	271	OPT_END(),
	272	};
	273
	274	struct strbuf sb, parsed;
	275	const char **usage = NULL;
	276	struct option *opts = NULL;
	277	int onb = 0, osz = 0, unb = 0, usz = 0;
	278
	279	strbuf_init(&parsed, 0);
	280	strbuf_addstr(&parsed, "set --");
	281	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	282	PARSE_OPT_KEEP_DASHDASH);
	283	if (argc < 1 \|\| strcmp(argv[0], "--"))
	284	usage_with_options(parseopt_usage, parseopt_opts);
	285
	286	strbuf_init(&sb, 0);
	287	/* get the usage up to the first line with a -- on it */
	288	for (;;) {
	289	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	290	die("premature end of input");
	291	ALLOC_GROW(usage, unb + 1, usz);
	292	if (!strcmp("--", sb.buf)) {
	293	if (unb < 1)
	294	die("no usage string given before the `--' separator");
	295	usage[unb] = NULL;
	296	break;
	297	}
	298	usage[unb++] = strbuf_detach(&sb, NULL);
	299	}
	300
	301	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
302	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
303	const char *s;
304	struct option *o;
305
306	if (!sb.len)
307	continue;
308
309	ALLOC_GROW(opts, onb + 1, osz);
310	memset(opts + onb, 0, sizeof(opts[onb]));
311
312	o = &opts[onb++];
313	s = strchr(sb.buf, ' ');
314	if (!s \|\| *sb.buf == ' ') {
315	o->type = OPTION_GROUP;
e1033436	316	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	317	continue;
	318	}
	319
	320	o->type = OPTION_CALLBACK;
	321	o->help = xstrdup(skipspaces(s));
	322	o->value = &parsed;
ff962a3f	323	o->flags = PARSE_OPT_NOARG;
21d47835	324	o->callback = &parseopt_dump;
ff962a3f PH	325	while (s > sb.buf && strchr("*=?!", s[-1])) {
	326	switch (*--s) {
	327	case '=':
	328	o->flags &= ~PARSE_OPT_NOARG;
	329	break;
	330	case '?':
	331	o->flags &= ~PARSE_OPT_NOARG;
	332	o->flags \|= PARSE_OPT_OPTARG;
	333	break;
	334	case '!':
	335	o->flags \|= PARSE_OPT_NONEG;
	336	break;
	337	case '*':
	338	o->flags \|= PARSE_OPT_HIDDEN;
	339	break;
	340	}
21d47835 PH	341	}
	342
	343	if (s - sb.buf == 1) /* short option only */
	344	o->short_name = *sb.buf;
	345	else if (sb.buf[1] != ',') /* long option only */
	346	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	347	else {
	348	o->short_name = *sb.buf;
	349	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	350	}
	351	}
	352	strbuf_release(&sb);
	353
	354	/* put an OPT_END() */
	355	ALLOC_GROW(opts, onb + 1, osz);
	356	memset(opts + onb, 0, sizeof(opts[onb]));
	357	argc = parse_options(argc, argv, opts, usage,
	358	keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
	359
	360	strbuf_addf(&parsed, " --");
b319ce4c	361	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	362	puts(parsed.buf);
	363	return 0;
	364	}
	365
b1b35969 CC	366	static void die_no_single_rev(int quiet)
	367	{
	368	if (quiet)
	369	exit(1);
	370	else
	371	die("Needed a single revision");
	372	}
	373
a633fca0	374	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	375	{
dfd1b749	376	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
178cb243	377	unsigned char sha1[20];
dfd1b749	378	const char *name = NULL;
a62be77f	379
21d47835 PH	380	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	381	return cmd_parseopt(argc - 1, argv + 1, prefix);
	382
5410a02a	383	prefix = setup_git_directory();
ef90d6d4	384	git_config(git_default_config, NULL);
178cb243	385	for (i = 1; i < argc; i++) {
16cee38a	386	const char *arg = argv[i];
fb18a2ed	387
178cb243	388	if (as_is) {
fb18a2ed	389	if (show_file(arg) && as_is < 2)
e23d0b4a	390	verify_filename(prefix, arg);
178cb243 LT	391	continue;
178cb243 LT	392	}
3af06987 EW	393	if (!strcmp(arg,"-n")) {
	394	if (++i >= argc)
	395	die("-n requires an argument");
	396	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	397	show(arg);
	398	show(argv[i]);
	399	}
	400	continue;
	401	}
1968d77d	402	if (!prefixcmp(arg, "-n")) {
3af06987 EW	403	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	404	show(arg);
	405	continue;
	406	}
	407
178cb243 LT	408	if (*arg == '-') {
178cb243 LT	409	if (!strcmp(arg, "--")) {
fb18a2ed	410	as_is = 2;
a08b6505 LT	411	/* Pass on the "--" if we show anything but files.. */
	412	if (filter & (DO_FLAGS \| DO_REVS))
	413	show_file(arg);
4866ccf0	414	continue;
178cb243 LT	415	}
178cb243 LT	416	if (!strcmp(arg, "--default")) {
178cb243 LT	417	def = argv[i+1];
	418	i++;
	419	continue;
	420	}
8ebb0184	421	if (!strcmp(arg, "--revs-only")) {
4866ccf0	422	filter &= ~DO_NOREV;
8ebb0184 LT	423	continue;
	424	}
	425	if (!strcmp(arg, "--no-revs")) {
4866ccf0	426	filter &= ~DO_REVS;
8ebb0184 LT	427	continue;
8ebb0184 LT	428	}
f79b65aa	429	if (!strcmp(arg, "--flags")) {
4866ccf0	430	filter &= ~DO_NONFLAGS;
f79b65aa LT	431	continue;
	432	}
	433	if (!strcmp(arg, "--no-flags")) {
4866ccf0	434	filter &= ~DO_FLAGS;
f79b65aa LT	435	continue;
f79b65aa LT	436	}
023d66ed	437	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	438	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	439	verify = 1;
023d66ed	440	continue;
921d865e	441	}
b1b35969 CC	442	if (!strcmp(arg, "--quiet") \|\| !strcmp(arg, "-q")) {
	443	quiet = 1;
	444	continue;
	445	}
62a604ba	446	if (!strcmp(arg, "--short") \|\|
cc44c765	447	!prefixcmp(arg, "--short=")) {
d5012508 JH	448	filter &= ~(DO_FLAGS\|DO_NOREV);
	449	verify = 1;
	450	abbrev = DEFAULT_ABBREV;
44de0da4 JF	451	if (arg[7] == '=')
44de0da4 JF	452	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	453	if (abbrev < MINIMUM_ABBREV)
	454	abbrev = MINIMUM_ABBREV;
	455	else if (40 <= abbrev)
	456	abbrev = 40;
d5012508 JH	457	continue;
d5012508 JH	458	}
5bb2c65a JH	459	if (!strcmp(arg, "--sq")) {
	460	output_sq = 1;
	461	continue;
	462	}
042a4ed7 LT	463	if (!strcmp(arg, "--not")) {
	464	show_type ^= REVERSED;
	465	continue;
	466	}
30b96fce	467	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	468	symbolic = SHOW_SYMBOLIC_ASIS;
	469	continue;
	470	}
	471	if (!strcmp(arg, "--symbolic-full-name")) {
	472	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	473	continue;
30b96fce JH	474	}
960bba0d	475	if (!strcmp(arg, "--all")) {
cb5d709f	476	for_each_ref(show_reference, NULL);
960bba0d LT	477	continue;
960bba0d LT	478	}
a62be77f	479	if (!strcmp(arg, "--branches")) {
cb5d709f	480	for_each_branch_ref(show_reference, NULL);
a62be77f SE	481	continue;
	482	}
	483	if (!strcmp(arg, "--tags")) {
cb5d709f	484	for_each_tag_ref(show_reference, NULL);
a62be77f SE	485	continue;
	486	}
	487	if (!strcmp(arg, "--remotes")) {
cb5d709f	488	for_each_remote_ref(show_reference, NULL);
a62be77f SE	489	continue;
a62be77f SE	490	}
d288a700	491	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	492	if (prefix)
4866ccf0 JH	493	puts(prefix);
d288a700 LT	494	continue;
d288a700 LT	495	}
5f94c730 JH	496	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	497	const char *pfx = prefix;
e90fdc39 JS	498	if (!is_inside_work_tree()) {
	499	const char *work_tree =
	500	get_git_work_tree();
	501	if (work_tree)
	502	printf("%s\n", work_tree);
	503	continue;
	504	}
5f94c730 JH	505	while (pfx) {
	506	pfx = strchr(pfx, '/');
	507	if (pfx) {
	508	pfx++;
	509	printf("../");
	510	}
	511	}
	512	putchar('\n');
	513	continue;
	514	}
a8783eeb LT	515	if (!strcmp(arg, "--git-dir")) {
	516	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	517	static char cwd[PATH_MAX];
	518	if (gitdir) {
	519	puts(gitdir);
	520	continue;
	521	}
	522	if (!prefix) {
	523	puts(".git");
	524	continue;
	525	}
	526	if (!getcwd(cwd, PATH_MAX))
	527	die("unable to get current working directory");
	528	printf("%s/.git\n", cwd);
	529	continue;
	530	}
6d9ba67b JS	531	if (!strcmp(arg, "--is-inside-git-dir")) {
	532	printf("%s\n", is_inside_git_dir() ? "true"
	533	: "false");
	534	continue;
	535	}
892c41b9 ML	536	if (!strcmp(arg, "--is-inside-work-tree")) {
	537	printf("%s\n", is_inside_work_tree() ? "true"
	538	: "false");
	539	continue;
	540	}
493c774e ML	541	if (!strcmp(arg, "--is-bare-repository")) {
	542	printf("%s\n", is_bare_repository() ? "true"
	543	: "false");
	544	continue;
	545	}
cc44c765	546	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	547	show_datestring("--max-age=", arg+8);
	548	continue;
	549	}
cc44c765	550	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	551	show_datestring("--max-age=", arg+8);
	552	continue;
	553	}
cc44c765	554	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	555	show_datestring("--min-age=", arg+9);
	556	continue;
	557	}
cc44c765	558	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	559	show_datestring("--min-age=", arg+8);
	560	continue;
	561	}
9523a4c2	562	if (show_flag(arg) && verify)
b1b35969	563	die_no_single_rev(quiet);
178cb243 LT	564	continue;
178cb243 LT	565	}
4866ccf0 JH	566
4866ccf0 JH	567	/* Not a flag argument */
3dd4e732 SB	568	if (try_difference(arg))
3dd4e732 SB	569	continue;
dfd1b749 CC	570	name = arg;
	571	type = NORMAL;
	572	if (*arg == '^') {
	573	name++;
	574	type = REVERSED;
800644c5	575	}
dfd1b749 CC	576	if (!get_sha1(name, sha1)) {
	577	if (verify)
	578	revs_count++;
	579	else
	580	show_rev(type, sha1, name);
800644c5 LT	581	continue;
800644c5 LT	582	}
75ecfce3 CC	583	if (verify)
75ecfce3 CC	584	die_no_single_rev(quiet);
9ad0a933 LT	585	as_is = 1;
	586	if (!show_file(arg))
	587	continue;
e23d0b4a	588	verify_filename(prefix, arg);
023d66ed	589	}
dfd1b749 CC	590	if (verify) {
	591	if (revs_count == 1) {
	592	show_rev(type, sha1, name);
	593	return 0;
	594	} else if (revs_count == 0 && show_default())
	595	return 0;
b1b35969	596	die_no_single_rev(quiet);
dfd1b749 CC	597	} else
dfd1b749 CC	598	show_default();
178cb243 LT	599	return 0;
178cb243 LT	600	}