[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);
}

/* 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;

	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 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 try_parent_shorthands(const char *arg)
{
	char *dotdot;
	unsigned char sha1[20];
	struct commit *commit;
	struct commit_list *parents;
	int parents_only;

	if ((dotdot = strstr(arg, "^!")))
		parents_only = 0;
	else if ((dotdot = strstr(arg, "^@")))
		parents_only = 1;

	if (!dotdot || dotdot[2])
		return 0;

	*dotdot = 0;
	if (get_sha1(arg, sha1))
		return 0;

	if (!parents_only)
		show_rev(NORMAL, sha1, arg);
	commit = lookup_commit_reference(sha1);
	for (parents = commit->parents; parents; parents = parents->next)
		show_rev(parents_only ? NORMAL : REVERSED,
				parents->item->object.sha1, arg);

	return 1;
}

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;
		if (try_parent_shorthands(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
e00f3790 JS	97	/* Like show(), but with a negation prefix according to type */
	98	static void show_with_type(int type, const char *arg)
	99	{
	100	if (type != show_type)
	101	putchar('^');
	102	show(arg);
	103	}
	104
4866ccf0	105	/* Output a revision, only if filter allows it */
30b96fce	106	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	107	{
4866ccf0	108	if (!(filter & DO_REVS))
023d66ed	109	return;
4866ccf0	110	def = NULL;
5bb2c65a	111
a6d97d49 JH	112	if (symbolic && name) {
	113	if (symbolic == SHOW_SYMBOLIC_FULL) {
	114	unsigned char discard[20];
	115	char *full;
	116
	117	switch (dwim_ref(name, strlen(name), discard, &full)) {
	118	case 0:
	119	/*
	120	* Not found -- not a ref. We could
	121	* emit "name" here, but symbolic-full
	122	* users are interested in finding the
	123	* refs spelled in full, and they would
	124	* need to filter non-refs if we did so.
	125	*/
	126	break;
	127	case 1: /* happy */
e00f3790	128	show_with_type(type, full);
a6d97d49 JH	129	break;
	130	default: /* ambiguous */
	131	error("refname '%s' is ambiguous", name);
	132	break;
	133	}
	134	} else {
e00f3790	135	show_with_type(type, name);
a6d97d49 JH	136	}
a6d97d49 JH	137	}
d5012508	138	else if (abbrev)
e00f3790	139	show_with_type(type, find_unique_abbrev(sha1, abbrev));
30b96fce	140	else
e00f3790	141	show_with_type(type, sha1_to_hex(sha1));
023d66ed LT	142	}
023d66ed LT	143
4866ccf0	144	/* Output a flag, only if filter allows it. */
16cee38a	145	static int show_flag(const char *arg)
023d66ed	146	{
4866ccf0	147	if (!(filter & DO_FLAGS))
9523a4c2 LT	148	return 0;
9523a4c2 LT	149	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	150	show(arg);
9523a4c2 LT	151	return 1;
	152	}
	153	return 0;
023d66ed LT	154	}
023d66ed LT	155
dfd1b749	156	static int show_default(void)
023d66ed	157	{
16cee38a	158	const char *s = def;
023d66ed LT	159
	160	if (s) {
	161	unsigned char sha1[20];
	162
	163	def = NULL;
9938af6a	164	if (!get_sha1(s, sha1)) {
30b96fce	165	show_rev(NORMAL, sha1, s);
dfd1b749	166	return 1;
023d66ed	167	}
023d66ed	168	}
dfd1b749	169	return 0;
023d66ed LT	170	}
023d66ed LT	171
8da19775	172	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	173	{
30b96fce	174	show_rev(NORMAL, sha1, refname);
960bba0d LT	175	return 0;
	176	}
	177
c1babb1d LT	178	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	179	{
c1babb1d	180	static char buffer[100];
c1babb1d LT	181
	182	/* date handling requires both flags and revs */
	183	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	184	return;
3c07b1d1	185	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	186	show(buffer);
	187	}
	188
9ad0a933	189	static int show_file(const char *arg)
7a3dd472	190	{
7b34c2fa	191	show_default();
9ad0a933	192	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	193	show(arg);
9ad0a933 LT	194	return 1;
	195	}
	196	return 0;
7a3dd472 LT	197	}
7a3dd472 LT	198
b7d936b2	199	static int try_difference(const char *arg)
3dd4e732 SB	200	{
	201	char *dotdot;
	202	unsigned char sha1[20];
	203	unsigned char end[20];
	204	const char *next;
	205	const char *this;
	206	int symmetric;
	207
	208	if (!(dotdot = strstr(arg, "..")))
	209	return 0;
	210	next = dotdot + 2;
	211	this = arg;
	212	symmetric = (*next == '.');
	213
	214	*dotdot = 0;
	215	next += symmetric;
	216
	217	if (!*next)
	218	next = "HEAD";
	219	if (dotdot == arg)
	220	this = "HEAD";
	221	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	222	show_rev(NORMAL, end, next);
	223	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	224	if (symmetric) {
	225	struct commit_list *exclude;
	226	struct commit a, b;
	227	a = lookup_commit_reference(sha1);
	228	b = lookup_commit_reference(end);
	229	exclude = get_merge_bases(a, b, 1);
	230	while (exclude) {
	231	struct commit_list *n = exclude->next;
	232	show_rev(REVERSED,
	233	exclude->item->object.sha1,NULL);
	234	free(exclude);
	235	exclude = n;
	236	}
	237	}
	238	return 1;
	239	}
	240	*dotdot = '.';
	241	return 0;
	242	}
	243
2122f8b9 BS	244	static int try_parent_shorthands(const char *arg)
	245	{
	246	char *dotdot;
	247	unsigned char sha1[20];
	248	struct commit *commit;
	249	struct commit_list *parents;
	250	int parents_only;
	251
	252	if ((dotdot = strstr(arg, "^!")))
	253	parents_only = 0;
	254	else if ((dotdot = strstr(arg, "^@")))
	255	parents_only = 1;
	256
	257	if (!dotdot \|\| dotdot[2])
	258	return 0;
	259
	260	*dotdot = 0;
	261	if (get_sha1(arg, sha1))
	262	return 0;
	263
	264	if (!parents_only)
	265	show_rev(NORMAL, sha1, arg);
	266	commit = lookup_commit_reference(sha1);
	267	for (parents = commit->parents; parents; parents = parents->next)
	268	show_rev(parents_only ? NORMAL : REVERSED,
	269	parents->item->object.sha1, arg);
	270
	271	return 1;
	272	}
	273
21d47835 PH	274	static int parseopt_dump(const struct option o, const char arg, int unset)
	275	{
	276	struct strbuf *parsed = o->value;
	277	if (unset)
	278	strbuf_addf(parsed, " --no-%s", o->long_name);
	279	else if (o->short_name)
	280	strbuf_addf(parsed, " -%c", o->short_name);
	281	else
	282	strbuf_addf(parsed, " --%s", o->long_name);
	283	if (arg) {
	284	strbuf_addch(parsed, ' ');
	285	sq_quote_buf(parsed, arg);
	286	}
	287	return 0;
	288	}
	289
	290	static const char skipspaces(const char s)
	291	{
	292	while (isspace(*s))
	293	s++;
	294	return s;
	295	}
	296
	297	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	298	{
	299	static int keep_dashdash = 0;
	300	static char const * const parseopt_usage[] = {
1b1dd23f	301	"git rev-parse --parseopt [options] -- [<args>...]",
21d47835 PH	302	NULL
	303	};
	304	static struct option parseopt_opts[] = {
	305	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	306	"keep the `--` passed as an arg"),
	307	OPT_END(),
	308	};
	309
	310	struct strbuf sb, parsed;
	311	const char **usage = NULL;
	312	struct option *opts = NULL;
	313	int onb = 0, osz = 0, unb = 0, usz = 0;
	314
	315	strbuf_init(&parsed, 0);
	316	strbuf_addstr(&parsed, "set --");
	317	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	318	PARSE_OPT_KEEP_DASHDASH);
	319	if (argc < 1 \|\| strcmp(argv[0], "--"))
	320	usage_with_options(parseopt_usage, parseopt_opts);
	321
	322	strbuf_init(&sb, 0);
	323	/* get the usage up to the first line with a -- on it */
	324	for (;;) {
	325	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	326	die("premature end of input");
	327	ALLOC_GROW(usage, unb + 1, usz);
	328	if (!strcmp("--", sb.buf)) {
	329	if (unb < 1)
	330	die("no usage string given before the `--' separator");
	331	usage[unb] = NULL;
	332	break;
	333	}
	334	usage[unb++] = strbuf_detach(&sb, NULL);
	335	}
	336
	337	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
	338	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
	339	const char *s;
	340	struct option *o;
	341
	342	if (!sb.len)
	343	continue;
	344
	345	ALLOC_GROW(opts, onb + 1, osz);
	346	memset(opts + onb, 0, sizeof(opts[onb]));
	347
	348	o = &opts[onb++];
	349	s = strchr(sb.buf, ' ');
	350	if (!s \|\| *sb.buf == ' ') {
	351	o->type = OPTION_GROUP;
e1033436	352	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	353	continue;
	354	}
	355
	356	o->type = OPTION_CALLBACK;
	357	o->help = xstrdup(skipspaces(s));
	358	o->value = &parsed;
ff962a3f	359	o->flags = PARSE_OPT_NOARG;
21d47835	360	o->callback = &parseopt_dump;
ff962a3f PH	361	while (s > sb.buf && strchr("*=?!", s[-1])) {
	362	switch (*--s) {
	363	case '=':
	364	o->flags &= ~PARSE_OPT_NOARG;
	365	break;
	366	case '?':
	367	o->flags &= ~PARSE_OPT_NOARG;
	368	o->flags \|= PARSE_OPT_OPTARG;
	369	break;
	370	case '!':
	371	o->flags \|= PARSE_OPT_NONEG;
	372	break;
	373	case '*':
	374	o->flags \|= PARSE_OPT_HIDDEN;
	375	break;
	376	}
21d47835 PH	377	}
	378
	379	if (s - sb.buf == 1) /* short option only */
	380	o->short_name = *sb.buf;
	381	else if (sb.buf[1] != ',') /* long option only */
	382	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	383	else {
	384	o->short_name = *sb.buf;
	385	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	386	}
	387	}
	388	strbuf_release(&sb);
	389
	390	/* put an OPT_END() */
	391	ALLOC_GROW(opts, onb + 1, osz);
	392	memset(opts + onb, 0, sizeof(opts[onb]));
	393	argc = parse_options(argc, argv, opts, usage,
	394	keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
	395
	396	strbuf_addf(&parsed, " --");
b319ce4c	397	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	398	puts(parsed.buf);
	399	return 0;
	400	}
	401
b1b35969 CC	402	static void die_no_single_rev(int quiet)
	403	{
	404	if (quiet)
	405	exit(1);
	406	else
	407	die("Needed a single revision");
	408	}
	409
a633fca0	410	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	411	{
dfd1b749	412	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
178cb243	413	unsigned char sha1[20];
dfd1b749	414	const char *name = NULL;
a62be77f	415
21d47835 PH	416	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	417	return cmd_parseopt(argc - 1, argv + 1, prefix);
	418
5410a02a	419	prefix = setup_git_directory();
ef90d6d4	420	git_config(git_default_config, NULL);
178cb243	421	for (i = 1; i < argc; i++) {
16cee38a	422	const char *arg = argv[i];
fb18a2ed	423
178cb243	424	if (as_is) {
fb18a2ed	425	if (show_file(arg) && as_is < 2)
e23d0b4a	426	verify_filename(prefix, arg);
178cb243 LT	427	continue;
178cb243 LT	428	}
3af06987 EW	429	if (!strcmp(arg,"-n")) {
	430	if (++i >= argc)
	431	die("-n requires an argument");
	432	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	433	show(arg);
	434	show(argv[i]);
	435	}
	436	continue;
	437	}
1968d77d	438	if (!prefixcmp(arg, "-n")) {
3af06987 EW	439	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	440	show(arg);
	441	continue;
	442	}
	443
178cb243 LT	444	if (*arg == '-') {
178cb243 LT	445	if (!strcmp(arg, "--")) {
fb18a2ed	446	as_is = 2;
a08b6505 LT	447	/* Pass on the "--" if we show anything but files.. */
	448	if (filter & (DO_FLAGS \| DO_REVS))
	449	show_file(arg);
4866ccf0	450	continue;
178cb243 LT	451	}
178cb243 LT	452	if (!strcmp(arg, "--default")) {
178cb243 LT	453	def = argv[i+1];
	454	i++;
	455	continue;
	456	}
8ebb0184	457	if (!strcmp(arg, "--revs-only")) {
4866ccf0	458	filter &= ~DO_NOREV;
8ebb0184 LT	459	continue;
	460	}
	461	if (!strcmp(arg, "--no-revs")) {
4866ccf0	462	filter &= ~DO_REVS;
8ebb0184 LT	463	continue;
8ebb0184 LT	464	}
f79b65aa	465	if (!strcmp(arg, "--flags")) {
4866ccf0	466	filter &= ~DO_NONFLAGS;
f79b65aa LT	467	continue;
	468	}
	469	if (!strcmp(arg, "--no-flags")) {
4866ccf0	470	filter &= ~DO_FLAGS;
f79b65aa LT	471	continue;
f79b65aa LT	472	}
023d66ed	473	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	474	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	475	verify = 1;
023d66ed	476	continue;
921d865e	477	}
b1b35969 CC	478	if (!strcmp(arg, "--quiet") \|\| !strcmp(arg, "-q")) {
	479	quiet = 1;
	480	continue;
	481	}
62a604ba	482	if (!strcmp(arg, "--short") \|\|
cc44c765	483	!prefixcmp(arg, "--short=")) {
d5012508 JH	484	filter &= ~(DO_FLAGS\|DO_NOREV);
	485	verify = 1;
	486	abbrev = DEFAULT_ABBREV;
44de0da4 JF	487	if (arg[7] == '=')
44de0da4 JF	488	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	489	if (abbrev < MINIMUM_ABBREV)
	490	abbrev = MINIMUM_ABBREV;
	491	else if (40 <= abbrev)
	492	abbrev = 40;
d5012508 JH	493	continue;
d5012508 JH	494	}
5bb2c65a JH	495	if (!strcmp(arg, "--sq")) {
	496	output_sq = 1;
	497	continue;
	498	}
042a4ed7 LT	499	if (!strcmp(arg, "--not")) {
	500	show_type ^= REVERSED;
	501	continue;
	502	}
30b96fce	503	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	504	symbolic = SHOW_SYMBOLIC_ASIS;
	505	continue;
	506	}
	507	if (!strcmp(arg, "--symbolic-full-name")) {
	508	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	509	continue;
30b96fce JH	510	}
960bba0d	511	if (!strcmp(arg, "--all")) {
cb5d709f	512	for_each_ref(show_reference, NULL);
960bba0d LT	513	continue;
960bba0d LT	514	}
a62be77f	515	if (!strcmp(arg, "--branches")) {
cb5d709f	516	for_each_branch_ref(show_reference, NULL);
a62be77f SE	517	continue;
	518	}
	519	if (!strcmp(arg, "--tags")) {
cb5d709f	520	for_each_tag_ref(show_reference, NULL);
a62be77f SE	521	continue;
	522	}
	523	if (!strcmp(arg, "--remotes")) {
cb5d709f	524	for_each_remote_ref(show_reference, NULL);
a62be77f SE	525	continue;
a62be77f SE	526	}
d288a700	527	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	528	if (prefix)
4866ccf0 JH	529	puts(prefix);
d288a700 LT	530	continue;
d288a700 LT	531	}
5f94c730 JH	532	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	533	const char *pfx = prefix;
e90fdc39 JS	534	if (!is_inside_work_tree()) {
	535	const char *work_tree =
	536	get_git_work_tree();
	537	if (work_tree)
	538	printf("%s\n", work_tree);
	539	continue;
	540	}
5f94c730 JH	541	while (pfx) {
	542	pfx = strchr(pfx, '/');
	543	if (pfx) {
	544	pfx++;
	545	printf("../");
	546	}
	547	}
	548	putchar('\n');
	549	continue;
	550	}
a8783eeb LT	551	if (!strcmp(arg, "--git-dir")) {
	552	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	553	static char cwd[PATH_MAX];
	554	if (gitdir) {
	555	puts(gitdir);
	556	continue;
	557	}
	558	if (!prefix) {
	559	puts(".git");
	560	continue;
	561	}
	562	if (!getcwd(cwd, PATH_MAX))
	563	die("unable to get current working directory");
	564	printf("%s/.git\n", cwd);
	565	continue;
	566	}
6d9ba67b JS	567	if (!strcmp(arg, "--is-inside-git-dir")) {
	568	printf("%s\n", is_inside_git_dir() ? "true"
	569	: "false");
	570	continue;
	571	}
892c41b9 ML	572	if (!strcmp(arg, "--is-inside-work-tree")) {
	573	printf("%s\n", is_inside_work_tree() ? "true"
	574	: "false");
	575	continue;
	576	}
493c774e ML	577	if (!strcmp(arg, "--is-bare-repository")) {
	578	printf("%s\n", is_bare_repository() ? "true"
	579	: "false");
	580	continue;
	581	}
cc44c765	582	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	583	show_datestring("--max-age=", arg+8);
	584	continue;
	585	}
cc44c765	586	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	587	show_datestring("--max-age=", arg+8);
	588	continue;
	589	}
cc44c765	590	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	591	show_datestring("--min-age=", arg+9);
	592	continue;
	593	}
cc44c765	594	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	595	show_datestring("--min-age=", arg+8);
	596	continue;
	597	}
9523a4c2	598	if (show_flag(arg) && verify)
b1b35969	599	die_no_single_rev(quiet);
178cb243 LT	600	continue;
178cb243 LT	601	}
4866ccf0 JH	602
4866ccf0 JH	603	/* Not a flag argument */
3dd4e732 SB	604	if (try_difference(arg))
3dd4e732 SB	605	continue;
2122f8b9 BS	606	if (try_parent_shorthands(arg))
2122f8b9 BS	607	continue;
dfd1b749 CC	608	name = arg;
	609	type = NORMAL;
	610	if (*arg == '^') {
	611	name++;
	612	type = REVERSED;
800644c5	613	}
dfd1b749 CC	614	if (!get_sha1(name, sha1)) {
	615	if (verify)
	616	revs_count++;
	617	else
	618	show_rev(type, sha1, name);
800644c5 LT	619	continue;
800644c5 LT	620	}
75ecfce3 CC	621	if (verify)
75ecfce3 CC	622	die_no_single_rev(quiet);
9ad0a933 LT	623	as_is = 1;
	624	if (!show_file(arg))
	625	continue;
e23d0b4a	626	verify_filename(prefix, arg);
023d66ed	627	}
dfd1b749 CC	628	if (verify) {
	629	if (revs_count == 1) {
	630	show_rev(type, sha1, name);
	631	return 0;
	632	} else if (revs_count == 0 && show_default())
	633	return 0;
b1b35969	634	die_no_single_rev(quiet);
dfd1b749 CC	635	} else
dfd1b749 CC	636	show_default();
178cb243 LT	637	return 0;
178cb243 LT	638	}