[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 abbrev_ref;
static int abbrev_ref_strict;
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 || abbrev_ref) && name) {
		if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
			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 */
				if (abbrev_ref)
					full = shorten_unambiguous_ref(full,
						abbrev_ref_strict);
				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 = STRBUF_INIT, parsed = STRBUF_INIT;
	const char **usage = NULL;
	struct option *opts = NULL;
	int onb = 0, osz = 0, unb = 0, usz = 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);

	/* 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 (!prefixcmp(arg, "--abbrev-ref") &&
			    (!arg[12] || arg[12] == '=')) {
				abbrev_ref = 1;
				abbrev_ref_strict = warn_ambiguous_refs;
				if (arg[12] == '=') {
					if (!strcmp(arg + 13, "strict"))
						abbrev_ref_strict = 1;
					else if (!strcmp(arg + 13, "loose"))
						abbrev_ref_strict = 0;
					else
						die("unknown mode for %s", arg);
				}
				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;
96f1e58f DR	28	static int abbrev;
a45d3469 BW	29	static int abbrev_ref;
a45d3469 BW	30	static int abbrev_ref_strict;
96f1e58f	31	static int output_sq;
4866ccf0	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	112	def = NULL;
5bb2c65a	113
a45d3469 BW	114	if ((symbolic \|\| abbrev_ref) && name) {
a45d3469 BW	115	if (symbolic == SHOW_SYMBOLIC_FULL \|\| abbrev_ref) {
a6d97d49 JH	116	unsigned char discard[20];
	117	char *full;
	118
	119	switch (dwim_ref(name, strlen(name), discard, &full)) {
	120	case 0:
	121	/*
	122	* Not found -- not a ref. We could
	123	* emit "name" here, but symbolic-full
	124	* users are interested in finding the
	125	* refs spelled in full, and they would
	126	* need to filter non-refs if we did so.
	127	*/
	128	break;
	129	case 1: /* happy */
a45d3469 BW	130	if (abbrev_ref)
	131	full = shorten_unambiguous_ref(full,
	132	abbrev_ref_strict);
e00f3790	133	show_with_type(type, full);
a6d97d49 JH	134	break;
	135	default: /* ambiguous */
	136	error("refname '%s' is ambiguous", name);
	137	break;
	138	}
	139	} else {
e00f3790	140	show_with_type(type, name);
a6d97d49 JH	141	}
a6d97d49 JH	142	}
d5012508	143	else if (abbrev)
e00f3790	144	show_with_type(type, find_unique_abbrev(sha1, abbrev));
30b96fce	145	else
e00f3790	146	show_with_type(type, sha1_to_hex(sha1));
023d66ed LT	147	}
023d66ed LT	148
4866ccf0	149	/* Output a flag, only if filter allows it. */
16cee38a	150	static int show_flag(const char *arg)
023d66ed	151	{
4866ccf0	152	if (!(filter & DO_FLAGS))
9523a4c2 LT	153	return 0;
9523a4c2 LT	154	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	155	show(arg);
9523a4c2 LT	156	return 1;
	157	}
	158	return 0;
023d66ed LT	159	}
023d66ed LT	160
dfd1b749	161	static int show_default(void)
023d66ed	162	{
16cee38a	163	const char *s = def;
023d66ed LT	164
	165	if (s) {
	166	unsigned char sha1[20];
	167
	168	def = NULL;
9938af6a	169	if (!get_sha1(s, sha1)) {
30b96fce	170	show_rev(NORMAL, sha1, s);
dfd1b749	171	return 1;
023d66ed	172	}
023d66ed	173	}
dfd1b749	174	return 0;
023d66ed LT	175	}
023d66ed LT	176
8da19775	177	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	178	{
30b96fce	179	show_rev(NORMAL, sha1, refname);
960bba0d LT	180	return 0;
	181	}
	182
c1babb1d LT	183	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	184	{
c1babb1d	185	static char buffer[100];
c1babb1d LT	186
	187	/* date handling requires both flags and revs */
	188	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	189	return;
3c07b1d1	190	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	191	show(buffer);
	192	}
	193
9ad0a933	194	static int show_file(const char *arg)
7a3dd472	195	{
7b34c2fa	196	show_default();
9ad0a933	197	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	198	show(arg);
9ad0a933 LT	199	return 1;
	200	}
	201	return 0;
7a3dd472 LT	202	}
7a3dd472 LT	203
b7d936b2	204	static int try_difference(const char *arg)
3dd4e732 SB	205	{
	206	char *dotdot;
	207	unsigned char sha1[20];
	208	unsigned char end[20];
	209	const char *next;
	210	const char *this;
	211	int symmetric;
	212
	213	if (!(dotdot = strstr(arg, "..")))
	214	return 0;
	215	next = dotdot + 2;
	216	this = arg;
	217	symmetric = (*next == '.');
	218
	219	*dotdot = 0;
	220	next += symmetric;
	221
	222	if (!*next)
	223	next = "HEAD";
	224	if (dotdot == arg)
	225	this = "HEAD";
	226	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	227	show_rev(NORMAL, end, next);
	228	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	229	if (symmetric) {
	230	struct commit_list *exclude;
	231	struct commit a, b;
	232	a = lookup_commit_reference(sha1);
	233	b = lookup_commit_reference(end);
	234	exclude = get_merge_bases(a, b, 1);
	235	while (exclude) {
	236	struct commit_list *n = exclude->next;
	237	show_rev(REVERSED,
	238	exclude->item->object.sha1,NULL);
	239	free(exclude);
	240	exclude = n;
	241	}
	242	}
	243	return 1;
	244	}
	245	*dotdot = '.';
	246	return 0;
	247	}
	248
2122f8b9 BS	249	static int try_parent_shorthands(const char *arg)
	250	{
	251	char *dotdot;
	252	unsigned char sha1[20];
	253	struct commit *commit;
	254	struct commit_list *parents;
	255	int parents_only;
	256
	257	if ((dotdot = strstr(arg, "^!")))
	258	parents_only = 0;
	259	else if ((dotdot = strstr(arg, "^@")))
	260	parents_only = 1;
	261
	262	if (!dotdot \|\| dotdot[2])
	263	return 0;
	264
	265	*dotdot = 0;
	266	if (get_sha1(arg, sha1))
	267	return 0;
	268
	269	if (!parents_only)
	270	show_rev(NORMAL, sha1, arg);
	271	commit = lookup_commit_reference(sha1);
	272	for (parents = commit->parents; parents; parents = parents->next)
	273	show_rev(parents_only ? NORMAL : REVERSED,
	274	parents->item->object.sha1, arg);
	275
	276	return 1;
	277	}
	278
21d47835 PH	279	static int parseopt_dump(const struct option o, const char arg, int unset)
	280	{
	281	struct strbuf *parsed = o->value;
	282	if (unset)
	283	strbuf_addf(parsed, " --no-%s", o->long_name);
	284	else if (o->short_name)
	285	strbuf_addf(parsed, " -%c", o->short_name);
	286	else
	287	strbuf_addf(parsed, " --%s", o->long_name);
	288	if (arg) {
	289	strbuf_addch(parsed, ' ');
	290	sq_quote_buf(parsed, arg);
	291	}
	292	return 0;
	293	}
	294
	295	static const char skipspaces(const char s)
	296	{
	297	while (isspace(*s))
	298	s++;
	299	return s;
	300	}
	301
	302	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	303	{
	304	static int keep_dashdash = 0;
	305	static char const * const parseopt_usage[] = {
1b1dd23f	306	"git rev-parse --parseopt [options] -- [<args>...]",
21d47835 PH	307	NULL
	308	};
	309	static struct option parseopt_opts[] = {
	310	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	311	"keep the `--` passed as an arg"),
	312	OPT_END(),
	313	};
	314
f285a2d7	315	struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
21d47835 PH	316	const char **usage = NULL;
	317	struct option *opts = NULL;
	318	int onb = 0, osz = 0, unb = 0, usz = 0;
	319
21d47835 PH	320	strbuf_addstr(&parsed, "set --");
	321	argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
	322	PARSE_OPT_KEEP_DASHDASH);
	323	if (argc < 1 \|\| strcmp(argv[0], "--"))
	324	usage_with_options(parseopt_usage, parseopt_opts);
	325
21d47835 PH	326	/* get the usage up to the first line with a -- on it */
	327	for (;;) {
	328	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	329	die("premature end of input");
	330	ALLOC_GROW(usage, unb + 1, usz);
	331	if (!strcmp("--", sb.buf)) {
	332	if (unb < 1)
	333	die("no usage string given before the `--' separator");
	334	usage[unb] = NULL;
	335	break;
	336	}
	337	usage[unb++] = strbuf_detach(&sb, NULL);
	338	}
	339
	340	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
	341	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
	342	const char *s;
	343	struct option *o;
	344
	345	if (!sb.len)
	346	continue;
	347
	348	ALLOC_GROW(opts, onb + 1, osz);
	349	memset(opts + onb, 0, sizeof(opts[onb]));
	350
	351	o = &opts[onb++];
	352	s = strchr(sb.buf, ' ');
	353	if (!s \|\| *sb.buf == ' ') {
	354	o->type = OPTION_GROUP;
e1033436	355	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	356	continue;
	357	}
	358
	359	o->type = OPTION_CALLBACK;
	360	o->help = xstrdup(skipspaces(s));
	361	o->value = &parsed;
ff962a3f	362	o->flags = PARSE_OPT_NOARG;
21d47835	363	o->callback = &parseopt_dump;
ff962a3f PH	364	while (s > sb.buf && strchr("*=?!", s[-1])) {
	365	switch (*--s) {
	366	case '=':
	367	o->flags &= ~PARSE_OPT_NOARG;
	368	break;
	369	case '?':
	370	o->flags &= ~PARSE_OPT_NOARG;
	371	o->flags \|= PARSE_OPT_OPTARG;
	372	break;
	373	case '!':
	374	o->flags \|= PARSE_OPT_NONEG;
	375	break;
	376	case '*':
	377	o->flags \|= PARSE_OPT_HIDDEN;
	378	break;
	379	}
21d47835 PH	380	}
	381
	382	if (s - sb.buf == 1) /* short option only */
	383	o->short_name = *sb.buf;
	384	else if (sb.buf[1] != ',') /* long option only */
	385	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	386	else {
	387	o->short_name = *sb.buf;
	388	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	389	}
	390	}
	391	strbuf_release(&sb);
	392
	393	/* put an OPT_END() */
	394	ALLOC_GROW(opts, onb + 1, osz);
	395	memset(opts + onb, 0, sizeof(opts[onb]));
	396	argc = parse_options(argc, argv, opts, usage,
	397	keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
	398
	399	strbuf_addf(&parsed, " --");
b319ce4c	400	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	401	puts(parsed.buf);
	402	return 0;
	403	}
	404
b1b35969 CC	405	static void die_no_single_rev(int quiet)
	406	{
	407	if (quiet)
	408	exit(1);
	409	else
	410	die("Needed a single revision");
	411	}
	412
a633fca0	413	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	414	{
dfd1b749	415	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
178cb243	416	unsigned char sha1[20];
dfd1b749	417	const char *name = NULL;
a62be77f	418
21d47835 PH	419	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	420	return cmd_parseopt(argc - 1, argv + 1, prefix);
	421
5410a02a	422	prefix = setup_git_directory();
ef90d6d4	423	git_config(git_default_config, NULL);
178cb243	424	for (i = 1; i < argc; i++) {
16cee38a	425	const char *arg = argv[i];
fb18a2ed	426
178cb243	427	if (as_is) {
fb18a2ed	428	if (show_file(arg) && as_is < 2)
e23d0b4a	429	verify_filename(prefix, arg);
178cb243 LT	430	continue;
178cb243 LT	431	}
3af06987 EW	432	if (!strcmp(arg,"-n")) {
	433	if (++i >= argc)
	434	die("-n requires an argument");
	435	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	436	show(arg);
	437	show(argv[i]);
	438	}
	439	continue;
	440	}
1968d77d	441	if (!prefixcmp(arg, "-n")) {
3af06987 EW	442	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	443	show(arg);
	444	continue;
	445	}
	446
178cb243 LT	447	if (*arg == '-') {
178cb243 LT	448	if (!strcmp(arg, "--")) {
fb18a2ed	449	as_is = 2;
a08b6505 LT	450	/* Pass on the "--" if we show anything but files.. */
	451	if (filter & (DO_FLAGS \| DO_REVS))
	452	show_file(arg);
4866ccf0	453	continue;
178cb243 LT	454	}
178cb243 LT	455	if (!strcmp(arg, "--default")) {
178cb243 LT	456	def = argv[i+1];
	457	i++;
	458	continue;
	459	}
8ebb0184	460	if (!strcmp(arg, "--revs-only")) {
4866ccf0	461	filter &= ~DO_NOREV;
8ebb0184 LT	462	continue;
	463	}
	464	if (!strcmp(arg, "--no-revs")) {
4866ccf0	465	filter &= ~DO_REVS;
8ebb0184 LT	466	continue;
8ebb0184 LT	467	}
f79b65aa	468	if (!strcmp(arg, "--flags")) {
4866ccf0	469	filter &= ~DO_NONFLAGS;
f79b65aa LT	470	continue;
	471	}
	472	if (!strcmp(arg, "--no-flags")) {
4866ccf0	473	filter &= ~DO_FLAGS;
f79b65aa LT	474	continue;
f79b65aa LT	475	}
023d66ed	476	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	477	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	478	verify = 1;
023d66ed	479	continue;
921d865e	480	}
b1b35969 CC	481	if (!strcmp(arg, "--quiet") \|\| !strcmp(arg, "-q")) {
	482	quiet = 1;
	483	continue;
	484	}
62a604ba	485	if (!strcmp(arg, "--short") \|\|
cc44c765	486	!prefixcmp(arg, "--short=")) {
d5012508 JH	487	filter &= ~(DO_FLAGS\|DO_NOREV);
	488	verify = 1;
	489	abbrev = DEFAULT_ABBREV;
44de0da4 JF	490	if (arg[7] == '=')
44de0da4 JF	491	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	492	if (abbrev < MINIMUM_ABBREV)
	493	abbrev = MINIMUM_ABBREV;
	494	else if (40 <= abbrev)
	495	abbrev = 40;
d5012508 JH	496	continue;
d5012508 JH	497	}
5bb2c65a JH	498	if (!strcmp(arg, "--sq")) {
	499	output_sq = 1;
	500	continue;
	501	}
042a4ed7 LT	502	if (!strcmp(arg, "--not")) {
	503	show_type ^= REVERSED;
	504	continue;
	505	}
30b96fce	506	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	507	symbolic = SHOW_SYMBOLIC_ASIS;
	508	continue;
	509	}
	510	if (!strcmp(arg, "--symbolic-full-name")) {
	511	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	512	continue;
30b96fce JH	513	}
a45d3469 BW	514	if (!prefixcmp(arg, "--abbrev-ref") &&
	515	(!arg[12] \|\| arg[12] == '=')) {
	516	abbrev_ref = 1;
	517	abbrev_ref_strict = warn_ambiguous_refs;
	518	if (arg[12] == '=') {
	519	if (!strcmp(arg + 13, "strict"))
	520	abbrev_ref_strict = 1;
	521	else if (!strcmp(arg + 13, "loose"))
	522	abbrev_ref_strict = 0;
	523	else
	524	die("unknown mode for %s", arg);
	525	}
	526	continue;
	527	}
960bba0d	528	if (!strcmp(arg, "--all")) {
cb5d709f	529	for_each_ref(show_reference, NULL);
960bba0d LT	530	continue;
960bba0d LT	531	}
a62be77f	532	if (!strcmp(arg, "--branches")) {
cb5d709f	533	for_each_branch_ref(show_reference, NULL);
a62be77f SE	534	continue;
	535	}
	536	if (!strcmp(arg, "--tags")) {
cb5d709f	537	for_each_tag_ref(show_reference, NULL);
a62be77f SE	538	continue;
	539	}
	540	if (!strcmp(arg, "--remotes")) {
cb5d709f	541	for_each_remote_ref(show_reference, NULL);
a62be77f SE	542	continue;
a62be77f SE	543	}
d288a700	544	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	545	if (prefix)
4866ccf0 JH	546	puts(prefix);
d288a700 LT	547	continue;
d288a700 LT	548	}
5f94c730 JH	549	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	550	const char *pfx = prefix;
e90fdc39 JS	551	if (!is_inside_work_tree()) {
	552	const char *work_tree =
	553	get_git_work_tree();
	554	if (work_tree)
	555	printf("%s\n", work_tree);
	556	continue;
	557	}
5f94c730 JH	558	while (pfx) {
	559	pfx = strchr(pfx, '/');
	560	if (pfx) {
	561	pfx++;
	562	printf("../");
	563	}
	564	}
	565	putchar('\n');
	566	continue;
	567	}
a8783eeb LT	568	if (!strcmp(arg, "--git-dir")) {
	569	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	570	static char cwd[PATH_MAX];
	571	if (gitdir) {
	572	puts(gitdir);
	573	continue;
	574	}
	575	if (!prefix) {
	576	puts(".git");
	577	continue;
	578	}
	579	if (!getcwd(cwd, PATH_MAX))
	580	die("unable to get current working directory");
	581	printf("%s/.git\n", cwd);
	582	continue;
	583	}
6d9ba67b JS	584	if (!strcmp(arg, "--is-inside-git-dir")) {
	585	printf("%s\n", is_inside_git_dir() ? "true"
	586	: "false");
	587	continue;
	588	}
892c41b9 ML	589	if (!strcmp(arg, "--is-inside-work-tree")) {
	590	printf("%s\n", is_inside_work_tree() ? "true"
	591	: "false");
	592	continue;
	593	}
493c774e ML	594	if (!strcmp(arg, "--is-bare-repository")) {
	595	printf("%s\n", is_bare_repository() ? "true"
	596	: "false");
	597	continue;
	598	}
cc44c765	599	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	600	show_datestring("--max-age=", arg+8);
	601	continue;
	602	}
cc44c765	603	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	604	show_datestring("--max-age=", arg+8);
	605	continue;
	606	}
cc44c765	607	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	608	show_datestring("--min-age=", arg+9);
	609	continue;
	610	}
cc44c765	611	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	612	show_datestring("--min-age=", arg+8);
	613	continue;
	614	}
9523a4c2	615	if (show_flag(arg) && verify)
b1b35969	616	die_no_single_rev(quiet);
178cb243 LT	617	continue;
178cb243 LT	618	}
4866ccf0 JH	619
4866ccf0 JH	620	/* Not a flag argument */
3dd4e732 SB	621	if (try_difference(arg))
3dd4e732 SB	622	continue;
2122f8b9 BS	623	if (try_parent_shorthands(arg))
2122f8b9 BS	624	continue;
dfd1b749 CC	625	name = arg;
	626	type = NORMAL;
	627	if (*arg == '^') {
	628	name++;
	629	type = REVERSED;
800644c5	630	}
dfd1b749 CC	631	if (!get_sha1(name, sha1)) {
	632	if (verify)
	633	revs_count++;
	634	else
	635	show_rev(type, sha1, name);
800644c5 LT	636	continue;
800644c5 LT	637	}
75ecfce3 CC	638	if (verify)
75ecfce3 CC	639	die_no_single_rev(quiet);
9ad0a933 LT	640	as_is = 1;
	641	if (!show_file(arg))
	642	continue;
e23d0b4a	643	verify_filename(prefix, arg);
023d66ed	644	}
dfd1b749 CC	645	if (verify) {
	646	if (revs_count == 1) {
	647	show_rev(type, sha1, name);
	648	return 0;
	649	} else if (revs_count == 0 && show_default())
	650	return 0;
b1b35969	651	die_no_single_rev(quiet);
dfd1b749 CC	652	} else
dfd1b749 CC	653	show_default();
178cb243 LT	654	return 0;
178cb243 LT	655	}