[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);
}

/* Like show(), but with a negation prefix according to type */
static void show_with_type(int type, const char *arg)
{
	if (type != show_type)
		putchar('^');
	show(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 (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_with_type(type, full);
				break;
			default: /* ambiguous */
				error("refname '%s' is ambiguous", name);
				break;
			}
		} else {
			show_with_type(type, name);
		}
	}
	else if (abbrev)
		show_with_type(type, find_unique_abbrev(sha1, abbrev));
	else
		show_with_type(type, 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;
}

int cmd_rev_parse(int argc, const char **argv, const char *prefix)
{
	int i, as_is = 0, verify = 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, "--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("Needed a single revision");
			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;
		}
		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"
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
e00f3790 JS	99	/* Like show(), but with a negation prefix according to type */
	100	static void show_with_type(int type, const char *arg)
	101	{
	102	if (type != show_type)
	103	putchar('^');
	104	show(arg);
	105	}
	106
4866ccf0	107	/* Output a revision, only if filter allows it */
30b96fce	108	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	109	{
4866ccf0	110	if (!(filter & DO_REVS))
023d66ed	111	return;
4866ccf0 JH	112	def = NULL;
4866ccf0 JH	113	revs_count++;
5bb2c65a	114
a6d97d49 JH	115	if (symbolic && name) {
	116	if (symbolic == SHOW_SYMBOLIC_FULL) {
	117	unsigned char discard[20];
	118	char *full;
	119
	120	switch (dwim_ref(name, strlen(name), discard, &full)) {
	121	case 0:
	122	/*
	123	* Not found -- not a ref. We could
	124	* emit "name" here, but symbolic-full
	125	* users are interested in finding the
	126	* refs spelled in full, and they would
	127	* need to filter non-refs if we did so.
	128	*/
	129	break;
	130	case 1: /* happy */
e00f3790	131	show_with_type(type, full);
a6d97d49 JH	132	break;
	133	default: /* ambiguous */
	134	error("refname '%s' is ambiguous", name);
	135	break;
	136	}
	137	} else {
e00f3790	138	show_with_type(type, name);
a6d97d49 JH	139	}
a6d97d49 JH	140	}
d5012508	141	else if (abbrev)
e00f3790	142	show_with_type(type, find_unique_abbrev(sha1, abbrev));
30b96fce	143	else
e00f3790	144	show_with_type(type, sha1_to_hex(sha1));
023d66ed LT	145	}
023d66ed LT	146
4866ccf0	147	/* Output a flag, only if filter allows it. */
16cee38a	148	static int show_flag(const char *arg)
023d66ed	149	{
4866ccf0	150	if (!(filter & DO_FLAGS))
9523a4c2 LT	151	return 0;
9523a4c2 LT	152	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	153	show(arg);
9523a4c2 LT	154	return 1;
	155	}
	156	return 0;
023d66ed LT	157	}
023d66ed LT	158
023d66ed LT	159	static void show_default(void)
023d66ed LT	160	{
16cee38a	161	const char *s = def;
023d66ed LT	162
	163	if (s) {
	164	unsigned char sha1[20];
	165
	166	def = NULL;
9938af6a	167	if (!get_sha1(s, sha1)) {
30b96fce	168	show_rev(NORMAL, sha1, s);
023d66ed LT	169	return;
023d66ed LT	170	}
023d66ed LT	171	}
	172	}
	173
8da19775	174	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	175	{
30b96fce	176	show_rev(NORMAL, sha1, refname);
960bba0d LT	177	return 0;
	178	}
	179
c1babb1d LT	180	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	181	{
c1babb1d	182	static char buffer[100];
c1babb1d LT	183
	184	/* date handling requires both flags and revs */
	185	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	186	return;
3c07b1d1	187	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	188	show(buffer);
	189	}
	190
9ad0a933	191	static int show_file(const char *arg)
7a3dd472	192	{
7b34c2fa	193	show_default();
9ad0a933	194	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	195	show(arg);
9ad0a933 LT	196	return 1;
	197	}
	198	return 0;
7a3dd472 LT	199	}
7a3dd472 LT	200
b7d936b2	201	static int try_difference(const char *arg)
3dd4e732 SB	202	{
	203	char *dotdot;
	204	unsigned char sha1[20];
	205	unsigned char end[20];
	206	const char *next;
	207	const char *this;
	208	int symmetric;
	209
	210	if (!(dotdot = strstr(arg, "..")))
	211	return 0;
	212	next = dotdot + 2;
	213	this = arg;
	214	symmetric = (*next == '.');
	215
	216	*dotdot = 0;
	217	next += symmetric;
	218
	219	if (!*next)
	220	next = "HEAD";
	221	if (dotdot == arg)
	222	this = "HEAD";
	223	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	224	show_rev(NORMAL, end, next);
	225	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	226	if (symmetric) {
	227	struct commit_list *exclude;
	228	struct commit a, b;
	229	a = lookup_commit_reference(sha1);
	230	b = lookup_commit_reference(end);
	231	exclude = get_merge_bases(a, b, 1);
	232	while (exclude) {
	233	struct commit_list *n = exclude->next;
	234	show_rev(REVERSED,
	235	exclude->item->object.sha1,NULL);
	236	free(exclude);
	237	exclude = n;
	238	}
	239	}
	240	return 1;
	241	}
	242	*dotdot = '.';
	243	return 0;
	244	}
	245
21d47835 PH	246	static int parseopt_dump(const struct option o, const char arg, int unset)
	247	{
	248	struct strbuf *parsed = o->value;
	249	if (unset)
	250	strbuf_addf(parsed, " --no-%s", o->long_name);
	251	else if (o->short_name)
	252	strbuf_addf(parsed, " -%c", o->short_name);
	253	else
	254	strbuf_addf(parsed, " --%s", o->long_name);
	255	if (arg) {
	256	strbuf_addch(parsed, ' ');
	257	sq_quote_buf(parsed, arg);
	258	}
	259	return 0;
	260	}
	261
	262	static const char skipspaces(const char s)
	263	{
	264	while (isspace(*s))
	265	s++;
	266	return s;
	267	}
	268
	269	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	270	{
	271	static int keep_dashdash = 0;
	272	static char const * const parseopt_usage[] = {
	273	"git-rev-parse --parseopt [options] -- [<args>...]",
	274	NULL
	275	};
	276	static struct option parseopt_opts[] = {
	277	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	278	"keep the `--` passed as an arg"),
	279	OPT_END(),
	280	};
	281
	282	struct strbuf sb, parsed;
	283	const char **usage = NULL;
	284	struct option *opts = NULL;
	285	int onb = 0, osz = 0, unb = 0, usz = 0;
	286
	287	strbuf_init(&parsed, 0);
	288	strbuf_addstr(&parsed, "set --");
	289	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	290	PARSE_OPT_KEEP_DASHDASH);
	291	if (argc < 1 \|\| strcmp(argv[0], "--"))
	292	usage_with_options(parseopt_usage, parseopt_opts);
	293
	294	strbuf_init(&sb, 0);
	295	/* get the usage up to the first line with a -- on it */
	296	for (;;) {
	297	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	298	die("premature end of input");
	299	ALLOC_GROW(usage, unb + 1, usz);
	300	if (!strcmp("--", sb.buf)) {
	301	if (unb < 1)
	302	die("no usage string given before the `--' separator");
	303	usage[unb] = NULL;
	304	break;
	305	}
	306	usage[unb++] = strbuf_detach(&sb, NULL);
	307	}
	308
	309	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
310	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
311	const char *s;
312	struct option *o;
313
314	if (!sb.len)
315	continue;
316
317	ALLOC_GROW(opts, onb + 1, osz);
318	memset(opts + onb, 0, sizeof(opts[onb]));
319
320	o = &opts[onb++];
321	s = strchr(sb.buf, ' ');
322	if (!s \|\| *sb.buf == ' ') {
323	o->type = OPTION_GROUP;
e1033436	324	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	325	continue;
	326	}
	327
	328	o->type = OPTION_CALLBACK;
	329	o->help = xstrdup(skipspaces(s));
	330	o->value = &parsed;
ff962a3f	331	o->flags = PARSE_OPT_NOARG;
21d47835	332	o->callback = &parseopt_dump;
ff962a3f PH	333	while (s > sb.buf && strchr("*=?!", s[-1])) {
	334	switch (*--s) {
	335	case '=':
	336	o->flags &= ~PARSE_OPT_NOARG;
	337	break;
	338	case '?':
	339	o->flags &= ~PARSE_OPT_NOARG;
	340	o->flags \|= PARSE_OPT_OPTARG;
	341	break;
	342	case '!':
	343	o->flags \|= PARSE_OPT_NONEG;
	344	break;
	345	case '*':
	346	o->flags \|= PARSE_OPT_HIDDEN;
	347	break;
	348	}
21d47835 PH	349	}
	350
	351	if (s - sb.buf == 1) /* short option only */
	352	o->short_name = *sb.buf;
	353	else if (sb.buf[1] != ',') /* long option only */
	354	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	355	else {
	356	o->short_name = *sb.buf;
	357	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	358	}
	359	}
	360	strbuf_release(&sb);
	361
	362	/* put an OPT_END() */
	363	ALLOC_GROW(opts, onb + 1, osz);
	364	memset(opts + onb, 0, sizeof(opts[onb]));
	365	argc = parse_options(argc, argv, opts, usage,
	366	keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
	367
	368	strbuf_addf(&parsed, " --");
b319ce4c	369	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	370	puts(parsed.buf);
	371	return 0;
	372	}
	373
a633fca0	374	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	375	{
4866ccf0	376	int i, as_is = 0, verify = 0;
178cb243	377	unsigned char sha1[20];
a62be77f	378
21d47835 PH	379	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	380	return cmd_parseopt(argc - 1, argv + 1, prefix);
	381
5410a02a JH	382	prefix = setup_git_directory();
5410a02a JH	383	git_config(git_default_config);
178cb243	384	for (i = 1; i < argc; i++) {
16cee38a	385	const char *arg = argv[i];
fb18a2ed	386
178cb243	387	if (as_is) {
fb18a2ed	388	if (show_file(arg) && as_is < 2)
e23d0b4a	389	verify_filename(prefix, arg);
178cb243 LT	390	continue;
178cb243 LT	391	}
3af06987 EW	392	if (!strcmp(arg,"-n")) {
	393	if (++i >= argc)
	394	die("-n requires an argument");
	395	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	396	show(arg);
	397	show(argv[i]);
	398	}
	399	continue;
	400	}
1968d77d	401	if (!prefixcmp(arg, "-n")) {
3af06987 EW	402	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	403	show(arg);
	404	continue;
	405	}
	406
178cb243 LT	407	if (*arg == '-') {
178cb243 LT	408	if (!strcmp(arg, "--")) {
fb18a2ed	409	as_is = 2;
a08b6505 LT	410	/* Pass on the "--" if we show anything but files.. */
	411	if (filter & (DO_FLAGS \| DO_REVS))
	412	show_file(arg);
4866ccf0	413	continue;
178cb243 LT	414	}
178cb243 LT	415	if (!strcmp(arg, "--default")) {
178cb243 LT	416	def = argv[i+1];
	417	i++;
	418	continue;
	419	}
8ebb0184	420	if (!strcmp(arg, "--revs-only")) {
4866ccf0	421	filter &= ~DO_NOREV;
8ebb0184 LT	422	continue;
	423	}
	424	if (!strcmp(arg, "--no-revs")) {
4866ccf0	425	filter &= ~DO_REVS;
8ebb0184 LT	426	continue;
8ebb0184 LT	427	}
f79b65aa	428	if (!strcmp(arg, "--flags")) {
4866ccf0	429	filter &= ~DO_NONFLAGS;
f79b65aa LT	430	continue;
	431	}
	432	if (!strcmp(arg, "--no-flags")) {
4866ccf0	433	filter &= ~DO_FLAGS;
f79b65aa LT	434	continue;
f79b65aa LT	435	}
023d66ed	436	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	437	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	438	verify = 1;
023d66ed	439	continue;
921d865e	440	}
62a604ba	441	if (!strcmp(arg, "--short") \|\|
cc44c765	442	!prefixcmp(arg, "--short=")) {
d5012508 JH	443	filter &= ~(DO_FLAGS\|DO_NOREV);
	444	verify = 1;
	445	abbrev = DEFAULT_ABBREV;
44de0da4 JF	446	if (arg[7] == '=')
44de0da4 JF	447	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	448	if (abbrev < MINIMUM_ABBREV)
	449	abbrev = MINIMUM_ABBREV;
	450	else if (40 <= abbrev)
	451	abbrev = 40;
d5012508 JH	452	continue;
d5012508 JH	453	}
5bb2c65a JH	454	if (!strcmp(arg, "--sq")) {
	455	output_sq = 1;
	456	continue;
	457	}
042a4ed7 LT	458	if (!strcmp(arg, "--not")) {
	459	show_type ^= REVERSED;
	460	continue;
	461	}
30b96fce	462	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	463	symbolic = SHOW_SYMBOLIC_ASIS;
	464	continue;
	465	}
	466	if (!strcmp(arg, "--symbolic-full-name")) {
	467	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	468	continue;
30b96fce JH	469	}
960bba0d	470	if (!strcmp(arg, "--all")) {
cb5d709f	471	for_each_ref(show_reference, NULL);
960bba0d LT	472	continue;
960bba0d LT	473	}
a62be77f	474	if (!strcmp(arg, "--branches")) {
cb5d709f	475	for_each_branch_ref(show_reference, NULL);
a62be77f SE	476	continue;
	477	}
	478	if (!strcmp(arg, "--tags")) {
cb5d709f	479	for_each_tag_ref(show_reference, NULL);
a62be77f SE	480	continue;
	481	}
	482	if (!strcmp(arg, "--remotes")) {
cb5d709f	483	for_each_remote_ref(show_reference, NULL);
a62be77f SE	484	continue;
a62be77f SE	485	}
d288a700	486	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	487	if (prefix)
4866ccf0 JH	488	puts(prefix);
d288a700 LT	489	continue;
d288a700 LT	490	}
5f94c730 JH	491	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	492	const char *pfx = prefix;
e90fdc39 JS	493	if (!is_inside_work_tree()) {
	494	const char *work_tree =
	495	get_git_work_tree();
	496	if (work_tree)
	497	printf("%s\n", work_tree);
	498	continue;
	499	}
5f94c730 JH	500	while (pfx) {
	501	pfx = strchr(pfx, '/');
	502	if (pfx) {
	503	pfx++;
	504	printf("../");
	505	}
	506	}
	507	putchar('\n');
	508	continue;
	509	}
a8783eeb LT	510	if (!strcmp(arg, "--git-dir")) {
	511	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	512	static char cwd[PATH_MAX];
	513	if (gitdir) {
	514	puts(gitdir);
	515	continue;
	516	}
	517	if (!prefix) {
	518	puts(".git");
	519	continue;
	520	}
	521	if (!getcwd(cwd, PATH_MAX))
	522	die("unable to get current working directory");
	523	printf("%s/.git\n", cwd);
	524	continue;
	525	}
6d9ba67b JS	526	if (!strcmp(arg, "--is-inside-git-dir")) {
	527	printf("%s\n", is_inside_git_dir() ? "true"
	528	: "false");
	529	continue;
	530	}
892c41b9 ML	531	if (!strcmp(arg, "--is-inside-work-tree")) {
	532	printf("%s\n", is_inside_work_tree() ? "true"
	533	: "false");
	534	continue;
	535	}
493c774e ML	536	if (!strcmp(arg, "--is-bare-repository")) {
	537	printf("%s\n", is_bare_repository() ? "true"
	538	: "false");
	539	continue;
	540	}
cc44c765	541	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	542	show_datestring("--max-age=", arg+8);
	543	continue;
	544	}
cc44c765	545	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	546	show_datestring("--max-age=", arg+8);
	547	continue;
	548	}
cc44c765	549	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	550	show_datestring("--min-age=", arg+9);
	551	continue;
	552	}
cc44c765	553	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	554	show_datestring("--min-age=", arg+8);
	555	continue;
	556	}
9523a4c2	557	if (show_flag(arg) && verify)
4866ccf0	558	die("Needed a single revision");
178cb243 LT	559	continue;
178cb243 LT	560	}
4866ccf0 JH	561
4866ccf0 JH	562	/* Not a flag argument */
3dd4e732 SB	563	if (try_difference(arg))
3dd4e732 SB	564	continue;
9938af6a	565	if (!get_sha1(arg, sha1)) {
30b96fce	566	show_rev(NORMAL, sha1, arg);
800644c5 LT	567	continue;
800644c5 LT	568	}
9938af6a	569	if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce	570	show_rev(REVERSED, sha1, arg+1);
800644c5 LT	571	continue;
800644c5 LT	572	}
9ad0a933 LT	573	as_is = 1;
	574	if (!show_file(arg))
	575	continue;
4866ccf0 JH	576	if (verify)
4866ccf0 JH	577	die("Needed a single revision");
e23d0b4a	578	verify_filename(prefix, arg);
023d66ed LT	579	}
023d66ed LT	580	show_default();
4866ccf0 JH	581	if (verify && revs_count != 1)
4866ccf0 JH	582	die("Needed a single revision");
178cb243 LT	583	return 0;
178cb243 LT	584	}