[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=",
		"--branches",
		"--header",
		"--max-age=",
		"--max-count=",
		"--min-age=",
		"--no-merges",
		"--objects",
		"--objects-edge",
		"--parents",
		"--pretty",
		"--remotes=",
		"--remotes",
		"--glob=",
		"--sparse",
		"--tags=",
		"--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 int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
{
	show_rev(REVERSED, 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, stop_at_non_option = 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_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
					"stop parsing after the "
					"first non-option argument"),
		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, prefix, 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, prefix, opts, usage,
			(keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
			(stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0));

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

static int cmd_sq_quote(int argc, const char **argv)
{
	struct strbuf buf = STRBUF_INIT;

	if (argc)
		sq_quote_argv(&buf, argv, 0);
	printf("%s\n", buf.buf);
	strbuf_release(&buf);

	return 0;
}

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

static const char builtin_rev_parse_usage[] =
"git rev-parse --parseopt [options] -- [<args>...]\n"
"   or: git rev-parse --sq-quote [<arg>...]\n"
"   or: git rev-parse [options] [<arg>...]\n"
"\n"
"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";

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);

	if (argc > 1 && !strcmp("--sq-quote", argv[1]))
		return cmd_sq_quote(argc - 2, argv + 2);

	if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
		int i;
		for (i = 0; local_repo_env[i]; i++)
			printf("%s\n", local_repo_env[i]);
		return 0;
	}

	if (argc > 1 && !strcmp("-h", argv[1]))
		usage(builtin_rev_parse_usage);

	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, "--bisect")) {
				for_each_ref_in("refs/bisect/bad", show_reference, NULL);
				for_each_ref_in("refs/bisect/good", anti_reference, NULL);
				continue;
			}
			if (!prefixcmp(arg, "--branches=")) {
				for_each_glob_ref_in(show_reference, arg + 11,
					"refs/heads/", NULL);
				continue;
			}
			if (!strcmp(arg, "--branches")) {
				for_each_branch_ref(show_reference, NULL);
				continue;
			}
			if (!prefixcmp(arg, "--tags=")) {
				for_each_glob_ref_in(show_reference, arg + 7,
					"refs/tags/", NULL);
				continue;
			}
			if (!strcmp(arg, "--tags")) {
				for_each_tag_ref(show_reference, NULL);
				continue;
			}
			if (!prefixcmp(arg, "--glob=")) {
				for_each_glob_ref(show_reference, arg + 7, NULL);
				continue;
			}
			if (!prefixcmp(arg, "--remotes=")) {
				for_each_glob_ref_in(show_reference, arg + 10,
					"refs/remotes/", NULL);
				continue;
			}
			if (!strcmp(arg, "--remotes")) {
				for_each_remote_ref(show_reference, NULL);
				continue;
			}
			if (!strcmp(arg, "--show-toplevel")) {
				const char *work_tree = get_git_work_tree();
				if (work_tree)
					puts(work_tree);
				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_errno("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",
b09fe971	44	"--branches=",
a62be77f	45	"--branches",
4866ccf0	46	"--header",
921d865e	47	"--max-age=",
4866ccf0	48	"--max-count=",
4866ccf0	49	"--min-age=",
5ccfb758	50	"--no-merges",
4866ccf0	51	"--objects",
c6496575	52	"--objects-edge",
4866ccf0 JH	53	"--parents",
4866ccf0 JH	54	"--pretty",
b09fe971	55	"--remotes=",
a62be77f	56	"--remotes",
d08bae7e	57	"--glob=",
5a83f3be	58	"--sparse",
b09fe971	59	"--tags=",
a62be77f	60	"--tags",
4866ccf0	61	"--topo-order",
4c8725f1	62	"--date-order",
4866ccf0	63	"--unpacked",
921d865e LT	64	NULL
	65	};
	66	const char **p = rev_args;
	67
8233340c EW	68	/* accept -<digit>, like traditional "head" */
	69	if ((*arg == '-') && isdigit(arg[1]))
	70	return 1;
	71
921d865e LT	72	for (;;) {
	73	const char str = p++;
	74	int len;
	75	if (!str)
	76	return 0;
	77	len = strlen(str);
4866ccf0 JH	78	if (!strcmp(arg, str) \|\|
4866ccf0 JH	79	(str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e LT	80	return 1;
	81	}
	82	}
	83
4866ccf0	84	/* Output argument as a string, either SQ or normal */
5bb2c65a JH	85	static void show(const char *arg)
	86	{
	87	if (output_sq) {
	88	int sq = '\'', ch;
	89
	90	putchar(sq);
	91	while ((ch = *arg++)) {
	92	if (ch == sq)
	93	fputs("'\\'", stdout);
	94	putchar(ch);
	95	}
	96	putchar(sq);
	97	putchar(' ');
	98	}
	99	else
	100	puts(arg);
	101	}
	102
e00f3790 JS	103	/* Like show(), but with a negation prefix according to type */
	104	static void show_with_type(int type, const char *arg)
	105	{
	106	if (type != show_type)
	107	putchar('^');
	108	show(arg);
	109	}
	110
4866ccf0	111	/* Output a revision, only if filter allows it */
30b96fce	112	static void show_rev(int type, const unsigned char sha1, const char name)
023d66ed	113	{
4866ccf0	114	if (!(filter & DO_REVS))
023d66ed	115	return;
4866ccf0	116	def = NULL;
5bb2c65a	117
a45d3469 BW	118	if ((symbolic \|\| abbrev_ref) && name) {
a45d3469 BW	119	if (symbolic == SHOW_SYMBOLIC_FULL \|\| abbrev_ref) {
a6d97d49 JH	120	unsigned char discard[20];
	121	char *full;
	122
	123	switch (dwim_ref(name, strlen(name), discard, &full)) {
	124	case 0:
	125	/*
	126	* Not found -- not a ref. We could
	127	* emit "name" here, but symbolic-full
	128	* users are interested in finding the
	129	* refs spelled in full, and they would
	130	* need to filter non-refs if we did so.
	131	*/
	132	break;
	133	case 1: /* happy */
a45d3469 BW	134	if (abbrev_ref)
	135	full = shorten_unambiguous_ref(full,
	136	abbrev_ref_strict);
e00f3790	137	show_with_type(type, full);
a6d97d49 JH	138	break;
	139	default: /* ambiguous */
	140	error("refname '%s' is ambiguous", name);
	141	break;
	142	}
	143	} else {
e00f3790	144	show_with_type(type, name);
a6d97d49 JH	145	}
a6d97d49 JH	146	}
d5012508	147	else if (abbrev)
e00f3790	148	show_with_type(type, find_unique_abbrev(sha1, abbrev));
30b96fce	149	else
e00f3790	150	show_with_type(type, sha1_to_hex(sha1));
023d66ed LT	151	}
023d66ed LT	152
4866ccf0	153	/* Output a flag, only if filter allows it. */
16cee38a	154	static int show_flag(const char *arg)
023d66ed	155	{
4866ccf0	156	if (!(filter & DO_FLAGS))
9523a4c2 LT	157	return 0;
9523a4c2 LT	158	if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d	159	show(arg);
9523a4c2 LT	160	return 1;
	161	}
	162	return 0;
023d66ed LT	163	}
023d66ed LT	164
dfd1b749	165	static int show_default(void)
023d66ed	166	{
16cee38a	167	const char *s = def;
023d66ed LT	168
	169	if (s) {
	170	unsigned char sha1[20];
	171
	172	def = NULL;
9938af6a	173	if (!get_sha1(s, sha1)) {
30b96fce	174	show_rev(NORMAL, sha1, s);
dfd1b749	175	return 1;
023d66ed	176	}
023d66ed	177	}
dfd1b749	178	return 0;
023d66ed LT	179	}
023d66ed LT	180
8da19775	181	static int show_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
960bba0d	182	{
30b96fce	183	show_rev(NORMAL, sha1, refname);
960bba0d LT	184	return 0;
	185	}
	186
ad3f9a71 LT	187	static int anti_reference(const char refname, const unsigned char sha1, int flag, void *cb_data)
	188	{
	189	show_rev(REVERSED, sha1, refname);
	190	return 0;
	191	}
	192
c1babb1d LT	193	static void show_datestring(const char flag, const char datestr)
c1babb1d LT	194	{
c1babb1d	195	static char buffer[100];
c1babb1d LT	196
	197	/* date handling requires both flags and revs */
	198	if ((filter & (DO_FLAGS \| DO_REVS)) != (DO_FLAGS \| DO_REVS))
	199	return;
3c07b1d1	200	snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d LT	201	show(buffer);
	202	}
	203
9ad0a933	204	static int show_file(const char *arg)
7a3dd472	205	{
7b34c2fa	206	show_default();
9ad0a933	207	if ((filter & (DO_NONFLAGS\|DO_NOREV)) == (DO_NONFLAGS\|DO_NOREV)) {
7a3dd472	208	show(arg);
9ad0a933 LT	209	return 1;
	210	}
	211	return 0;
7a3dd472 LT	212	}
7a3dd472 LT	213
b7d936b2	214	static int try_difference(const char *arg)
3dd4e732 SB	215	{
	216	char *dotdot;
	217	unsigned char sha1[20];
	218	unsigned char end[20];
	219	const char *next;
	220	const char *this;
	221	int symmetric;
	222
	223	if (!(dotdot = strstr(arg, "..")))
	224	return 0;
	225	next = dotdot + 2;
	226	this = arg;
	227	symmetric = (*next == '.');
	228
	229	*dotdot = 0;
	230	next += symmetric;
	231
	232	if (!*next)
	233	next = "HEAD";
	234	if (dotdot == arg)
	235	this = "HEAD";
	236	if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
	237	show_rev(NORMAL, end, next);
	238	show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
	239	if (symmetric) {
	240	struct commit_list *exclude;
	241	struct commit a, b;
	242	a = lookup_commit_reference(sha1);
	243	b = lookup_commit_reference(end);
	244	exclude = get_merge_bases(a, b, 1);
	245	while (exclude) {
	246	struct commit_list *n = exclude->next;
	247	show_rev(REVERSED,
	248	exclude->item->object.sha1,NULL);
	249	free(exclude);
	250	exclude = n;
	251	}
	252	}
	253	return 1;
	254	}
	255	*dotdot = '.';
	256	return 0;
	257	}
	258
2122f8b9 BS	259	static int try_parent_shorthands(const char *arg)
	260	{
	261	char *dotdot;
	262	unsigned char sha1[20];
	263	struct commit *commit;
	264	struct commit_list *parents;
	265	int parents_only;
	266
	267	if ((dotdot = strstr(arg, "^!")))
	268	parents_only = 0;
	269	else if ((dotdot = strstr(arg, "^@")))
	270	parents_only = 1;
	271
	272	if (!dotdot \|\| dotdot[2])
	273	return 0;
	274
	275	*dotdot = 0;
	276	if (get_sha1(arg, sha1))
	277	return 0;
	278
	279	if (!parents_only)
	280	show_rev(NORMAL, sha1, arg);
	281	commit = lookup_commit_reference(sha1);
	282	for (parents = commit->parents; parents; parents = parents->next)
	283	show_rev(parents_only ? NORMAL : REVERSED,
	284	parents->item->object.sha1, arg);
	285
	286	return 1;
	287	}
	288
21d47835 PH	289	static int parseopt_dump(const struct option o, const char arg, int unset)
	290	{
	291	struct strbuf *parsed = o->value;
	292	if (unset)
	293	strbuf_addf(parsed, " --no-%s", o->long_name);
	294	else if (o->short_name)
	295	strbuf_addf(parsed, " -%c", o->short_name);
	296	else
	297	strbuf_addf(parsed, " --%s", o->long_name);
	298	if (arg) {
	299	strbuf_addch(parsed, ' ');
	300	sq_quote_buf(parsed, arg);
	301	}
	302	return 0;
	303	}
	304
	305	static const char skipspaces(const char s)
	306	{
	307	while (isspace(*s))
	308	s++;
	309	return s;
	310	}
	311
	312	static int cmd_parseopt(int argc, const char *argv, const char prefix)
	313	{
6e0800ef	314	static int keep_dashdash = 0, stop_at_non_option = 0;
21d47835	315	static char const * const parseopt_usage[] = {
1b1dd23f	316	"git rev-parse --parseopt [options] -- [<args>...]",
21d47835 PH	317	NULL
	318	};
	319	static struct option parseopt_opts[] = {
	320	OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
	321	"keep the `--` passed as an arg"),
6e0800ef UKK	322	OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
	323	"stop parsing after the "
	324	"first non-option argument"),
21d47835 PH	325	OPT_END(),
	326	};
	327
f285a2d7	328	struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
21d47835 PH	329	const char **usage = NULL;
	330	struct option *opts = NULL;
	331	int onb = 0, osz = 0, unb = 0, usz = 0;
	332
21d47835	333	strbuf_addstr(&parsed, "set --");
37782920	334	argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
21d47835 PH	335	PARSE_OPT_KEEP_DASHDASH);
	336	if (argc < 1 \|\| strcmp(argv[0], "--"))
	337	usage_with_options(parseopt_usage, parseopt_opts);
	338
21d47835 PH	339	/* get the usage up to the first line with a -- on it */
	340	for (;;) {
	341	if (strbuf_getline(&sb, stdin, '\n') == EOF)
	342	die("premature end of input");
	343	ALLOC_GROW(usage, unb + 1, usz);
	344	if (!strcmp("--", sb.buf)) {
	345	if (unb < 1)
	346	die("no usage string given before the `--' separator");
	347	usage[unb] = NULL;
	348	break;
	349	}
	350	usage[unb++] = strbuf_detach(&sb, NULL);
	351	}
	352
	353	/* parse: (<short>\|<short>,<long>\|<long>)[=?]? SP+ <help> */
	354	while (strbuf_getline(&sb, stdin, '\n') != EOF) {
	355	const char *s;
	356	struct option *o;
	357
	358	if (!sb.len)
	359	continue;
	360
	361	ALLOC_GROW(opts, onb + 1, osz);
	362	memset(opts + onb, 0, sizeof(opts[onb]));
	363
	364	o = &opts[onb++];
	365	s = strchr(sb.buf, ' ');
	366	if (!s \|\| *sb.buf == ' ') {
	367	o->type = OPTION_GROUP;
e1033436	368	o->help = xstrdup(skipspaces(sb.buf));
21d47835 PH	369	continue;
	370	}
	371
	372	o->type = OPTION_CALLBACK;
	373	o->help = xstrdup(skipspaces(s));
	374	o->value = &parsed;
ff962a3f	375	o->flags = PARSE_OPT_NOARG;
21d47835	376	o->callback = &parseopt_dump;
ff962a3f PH	377	while (s > sb.buf && strchr("*=?!", s[-1])) {
	378	switch (*--s) {
	379	case '=':
	380	o->flags &= ~PARSE_OPT_NOARG;
	381	break;
	382	case '?':
	383	o->flags &= ~PARSE_OPT_NOARG;
	384	o->flags \|= PARSE_OPT_OPTARG;
	385	break;
	386	case '!':
	387	o->flags \|= PARSE_OPT_NONEG;
	388	break;
	389	case '*':
	390	o->flags \|= PARSE_OPT_HIDDEN;
	391	break;
	392	}
21d47835 PH	393	}
	394
	395	if (s - sb.buf == 1) /* short option only */
	396	o->short_name = *sb.buf;
	397	else if (sb.buf[1] != ',') /* long option only */
	398	o->long_name = xmemdupz(sb.buf, s - sb.buf);
	399	else {
	400	o->short_name = *sb.buf;
	401	o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
	402	}
	403	}
	404	strbuf_release(&sb);
	405
	406	/* put an OPT_END() */
	407	ALLOC_GROW(opts, onb + 1, osz);
	408	memset(opts + onb, 0, sizeof(opts[onb]));
37782920	409	argc = parse_options(argc, argv, prefix, opts, usage,
29981380 UKK	410	(keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) \|
29981380 UKK	411	(stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0));
21d47835 PH	412
21d47835 PH	413	strbuf_addf(&parsed, " --");
b319ce4c	414	sq_quote_argv(&parsed, argv, 0);
21d47835 PH	415	puts(parsed.buf);
	416	return 0;
	417	}
	418
50325377 CC	419	static int cmd_sq_quote(int argc, const char **argv)
	420	{
	421	struct strbuf buf = STRBUF_INIT;
	422
	423	if (argc)
	424	sq_quote_argv(&buf, argv, 0);
	425	printf("%s\n", buf.buf);
	426	strbuf_release(&buf);
	427
	428	return 0;
	429	}
	430
b1b35969 CC	431	static void die_no_single_rev(int quiet)
	432	{
	433	if (quiet)
	434	exit(1);
	435	else
	436	die("Needed a single revision");
	437	}
	438
7006b5be JN	439	static const char builtin_rev_parse_usage[] =
	440	"git rev-parse --parseopt [options] -- [<args>...]\n"
	441	" or: git rev-parse --sq-quote [<arg>...]\n"
	442	" or: git rev-parse [options] [<arg>...]\n"
	443	"\n"
	444	"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
	445
a633fca0	446	int cmd_rev_parse(int argc, const char *argv, const char prefix)
178cb243	447	{
dfd1b749	448	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
178cb243	449	unsigned char sha1[20];
dfd1b749	450	const char *name = NULL;
a62be77f	451
21d47835 PH	452	if (argc > 1 && !strcmp("--parseopt", argv[1]))
	453	return cmd_parseopt(argc - 1, argv + 1, prefix);
	454
50325377 CC	455	if (argc > 1 && !strcmp("--sq-quote", argv[1]))
	456	return cmd_sq_quote(argc - 2, argv + 2);
	457
94c8ccaa GB	458	if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
	459	int i;
	460	for (i = 0; local_repo_env[i]; i++)
	461	printf("%s\n", local_repo_env[i]);
	462	return 0;
	463	}
	464
7006b5be JN	465	if (argc > 1 && !strcmp("-h", argv[1]))
	466	usage(builtin_rev_parse_usage);
	467
5410a02a	468	prefix = setup_git_directory();
ef90d6d4	469	git_config(git_default_config, NULL);
178cb243	470	for (i = 1; i < argc; i++) {
16cee38a	471	const char *arg = argv[i];
fb18a2ed	472
178cb243	473	if (as_is) {
fb18a2ed	474	if (show_file(arg) && as_is < 2)
e23d0b4a	475	verify_filename(prefix, arg);
178cb243 LT	476	continue;
178cb243 LT	477	}
3af06987 EW	478	if (!strcmp(arg,"-n")) {
	479	if (++i >= argc)
	480	die("-n requires an argument");
	481	if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
	482	show(arg);
	483	show(argv[i]);
	484	}
	485	continue;
	486	}
1968d77d	487	if (!prefixcmp(arg, "-n")) {
3af06987 EW	488	if ((filter & DO_FLAGS) && (filter & DO_REVS))
	489	show(arg);
	490	continue;
	491	}
	492
178cb243 LT	493	if (*arg == '-') {
178cb243 LT	494	if (!strcmp(arg, "--")) {
fb18a2ed	495	as_is = 2;
a08b6505 LT	496	/* Pass on the "--" if we show anything but files.. */
	497	if (filter & (DO_FLAGS \| DO_REVS))
	498	show_file(arg);
4866ccf0	499	continue;
178cb243 LT	500	}
178cb243 LT	501	if (!strcmp(arg, "--default")) {
178cb243 LT	502	def = argv[i+1];
	503	i++;
	504	continue;
	505	}
8ebb0184	506	if (!strcmp(arg, "--revs-only")) {
4866ccf0	507	filter &= ~DO_NOREV;
8ebb0184 LT	508	continue;
	509	}
	510	if (!strcmp(arg, "--no-revs")) {
4866ccf0	511	filter &= ~DO_REVS;
8ebb0184 LT	512	continue;
8ebb0184 LT	513	}
f79b65aa	514	if (!strcmp(arg, "--flags")) {
4866ccf0	515	filter &= ~DO_NONFLAGS;
f79b65aa LT	516	continue;
	517	}
	518	if (!strcmp(arg, "--no-flags")) {
4866ccf0	519	filter &= ~DO_FLAGS;
f79b65aa LT	520	continue;
f79b65aa LT	521	}
023d66ed	522	if (!strcmp(arg, "--verify")) {
4866ccf0 JH	523	filter &= ~(DO_FLAGS\|DO_NOREV);
4866ccf0 JH	524	verify = 1;
023d66ed	525	continue;
921d865e	526	}
b1b35969 CC	527	if (!strcmp(arg, "--quiet") \|\| !strcmp(arg, "-q")) {
	528	quiet = 1;
	529	continue;
	530	}
62a604ba	531	if (!strcmp(arg, "--short") \|\|
cc44c765	532	!prefixcmp(arg, "--short=")) {
d5012508 JH	533	filter &= ~(DO_FLAGS\|DO_NOREV);
	534	verify = 1;
	535	abbrev = DEFAULT_ABBREV;
44de0da4 JF	536	if (arg[7] == '=')
44de0da4 JF	537	abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84 JH	538	if (abbrev < MINIMUM_ABBREV)
	539	abbrev = MINIMUM_ABBREV;
	540	else if (40 <= abbrev)
	541	abbrev = 40;
d5012508 JH	542	continue;
d5012508 JH	543	}
5bb2c65a JH	544	if (!strcmp(arg, "--sq")) {
	545	output_sq = 1;
	546	continue;
	547	}
042a4ed7 LT	548	if (!strcmp(arg, "--not")) {
	549	show_type ^= REVERSED;
	550	continue;
	551	}
30b96fce	552	if (!strcmp(arg, "--symbolic")) {
a6d97d49 JH	553	symbolic = SHOW_SYMBOLIC_ASIS;
	554	continue;
	555	}
	556	if (!strcmp(arg, "--symbolic-full-name")) {
	557	symbolic = SHOW_SYMBOLIC_FULL;
30b96fce JH	558	continue;
30b96fce JH	559	}
a45d3469 BW	560	if (!prefixcmp(arg, "--abbrev-ref") &&
	561	(!arg[12] \|\| arg[12] == '=')) {
	562	abbrev_ref = 1;
	563	abbrev_ref_strict = warn_ambiguous_refs;
	564	if (arg[12] == '=') {
	565	if (!strcmp(arg + 13, "strict"))
	566	abbrev_ref_strict = 1;
	567	else if (!strcmp(arg + 13, "loose"))
	568	abbrev_ref_strict = 0;
	569	else
	570	die("unknown mode for %s", arg);
	571	}
	572	continue;
	573	}
960bba0d	574	if (!strcmp(arg, "--all")) {
cb5d709f	575	for_each_ref(show_reference, NULL);
960bba0d LT	576	continue;
960bba0d LT	577	}
ad3f9a71 LT	578	if (!strcmp(arg, "--bisect")) {
	579	for_each_ref_in("refs/bisect/bad", show_reference, NULL);
	580	for_each_ref_in("refs/bisect/good", anti_reference, NULL);
	581	continue;
	582	}
b09fe971 IL	583	if (!prefixcmp(arg, "--branches=")) {
	584	for_each_glob_ref_in(show_reference, arg + 11,
	585	"refs/heads/", NULL);
	586	continue;
	587	}
a62be77f	588	if (!strcmp(arg, "--branches")) {
cb5d709f	589	for_each_branch_ref(show_reference, NULL);
a62be77f SE	590	continue;
a62be77f SE	591	}
b09fe971 IL	592	if (!prefixcmp(arg, "--tags=")) {
	593	for_each_glob_ref_in(show_reference, arg + 7,
	594	"refs/tags/", NULL);
	595	continue;
	596	}
a62be77f	597	if (!strcmp(arg, "--tags")) {
cb5d709f	598	for_each_tag_ref(show_reference, NULL);
a62be77f SE	599	continue;
a62be77f SE	600	}
d08bae7e IL	601	if (!prefixcmp(arg, "--glob=")) {
	602	for_each_glob_ref(show_reference, arg + 7, NULL);
	603	continue;
	604	}
b09fe971 IL	605	if (!prefixcmp(arg, "--remotes=")) {
	606	for_each_glob_ref_in(show_reference, arg + 10,
	607	"refs/remotes/", NULL);
	608	continue;
	609	}
a62be77f	610	if (!strcmp(arg, "--remotes")) {
cb5d709f	611	for_each_remote_ref(show_reference, NULL);
a62be77f SE	612	continue;
a62be77f SE	613	}
7cceca5c SD	614	if (!strcmp(arg, "--show-toplevel")) {
	615	const char *work_tree = get_git_work_tree();
	616	if (work_tree)
	617	puts(work_tree);
	618	continue;
	619	}
d288a700	620	if (!strcmp(arg, "--show-prefix")) {
4866ccf0 JH	621	if (prefix)
4866ccf0 JH	622	puts(prefix);
d288a700 LT	623	continue;
d288a700 LT	624	}
5f94c730 JH	625	if (!strcmp(arg, "--show-cdup")) {
5f94c730 JH	626	const char *pfx = prefix;
e90fdc39 JS	627	if (!is_inside_work_tree()) {
	628	const char *work_tree =
	629	get_git_work_tree();
	630	if (work_tree)
	631	printf("%s\n", work_tree);
	632	continue;
	633	}
5f94c730 JH	634	while (pfx) {
	635	pfx = strchr(pfx, '/');
	636	if (pfx) {
	637	pfx++;
	638	printf("../");
	639	}
	640	}
	641	putchar('\n');
	642	continue;
	643	}
a8783eeb LT	644	if (!strcmp(arg, "--git-dir")) {
	645	const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
	646	static char cwd[PATH_MAX];
	647	if (gitdir) {
	648	puts(gitdir);
	649	continue;
	650	}
	651	if (!prefix) {
	652	puts(".git");
	653	continue;
	654	}
	655	if (!getcwd(cwd, PATH_MAX))
0721c314	656	die_errno("unable to get current working directory");
a8783eeb LT	657	printf("%s/.git\n", cwd);
	658	continue;
	659	}
6d9ba67b JS	660	if (!strcmp(arg, "--is-inside-git-dir")) {
	661	printf("%s\n", is_inside_git_dir() ? "true"
	662	: "false");
	663	continue;
	664	}
892c41b9 ML	665	if (!strcmp(arg, "--is-inside-work-tree")) {
	666	printf("%s\n", is_inside_work_tree() ? "true"
	667	: "false");
	668	continue;
	669	}
493c774e ML	670	if (!strcmp(arg, "--is-bare-repository")) {
	671	printf("%s\n", is_bare_repository() ? "true"
	672	: "false");
	673	continue;
	674	}
cc44c765	675	if (!prefixcmp(arg, "--since=")) {
c1babb1d LT	676	show_datestring("--max-age=", arg+8);
	677	continue;
	678	}
cc44c765	679	if (!prefixcmp(arg, "--after=")) {
c1babb1d LT	680	show_datestring("--max-age=", arg+8);
	681	continue;
	682	}
cc44c765	683	if (!prefixcmp(arg, "--before=")) {
c1babb1d LT	684	show_datestring("--min-age=", arg+9);
	685	continue;
	686	}
cc44c765	687	if (!prefixcmp(arg, "--until=")) {
c1babb1d LT	688	show_datestring("--min-age=", arg+8);
	689	continue;
	690	}
9523a4c2	691	if (show_flag(arg) && verify)
b1b35969	692	die_no_single_rev(quiet);
178cb243 LT	693	continue;
178cb243 LT	694	}
4866ccf0 JH	695
4866ccf0 JH	696	/* Not a flag argument */
3dd4e732 SB	697	if (try_difference(arg))
3dd4e732 SB	698	continue;
2122f8b9 BS	699	if (try_parent_shorthands(arg))
2122f8b9 BS	700	continue;
dfd1b749 CC	701	name = arg;
	702	type = NORMAL;
	703	if (*arg == '^') {
	704	name++;
	705	type = REVERSED;
800644c5	706	}
dfd1b749 CC	707	if (!get_sha1(name, sha1)) {
	708	if (verify)
	709	revs_count++;
	710	else
	711	show_rev(type, sha1, name);
800644c5 LT	712	continue;
800644c5 LT	713	}
75ecfce3 CC	714	if (verify)
75ecfce3 CC	715	die_no_single_rev(quiet);
9ad0a933 LT	716	as_is = 1;
	717	if (!show_file(arg))
	718	continue;
e23d0b4a	719	verify_filename(prefix, arg);
023d66ed	720	}
dfd1b749 CC	721	if (verify) {
	722	if (revs_count == 1) {
	723	show_rev(type, sha1, name);
	724	return 0;
	725	} else if (revs_count == 0 && show_default())
	726	return 0;
b1b35969	727	die_no_single_rev(quiet);
dfd1b749 CC	728	} else
dfd1b749 CC	729	show_default();
178cb243 LT	730	return 0;
178cb243 LT	731	}