e08677e559f443f8a290f200f691ef770ecde3ef
[git/git.git] / builtin / rev-parse.c
1 /*
2 * rev-parse.c
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "cache.h"
7 #include "commit.h"
8 #include "refs.h"
9 #include "quote.h"
10 #include "builtin.h"
11 #include "parse-options.h"
12 #include "diff.h"
13 #include "revision.h"
14 #include "split-index.h"
15
16 #define DO_REVS 1
17 #define DO_NOREV 2
18 #define DO_FLAGS 4
19 #define DO_NONFLAGS 8
20 static int filter = ~0;
21
22 static const char *def;
23
24 #define NORMAL 0
25 #define REVERSED 1
26 static int show_type = NORMAL;
27
28 #define SHOW_SYMBOLIC_ASIS 1
29 #define SHOW_SYMBOLIC_FULL 2
30 static int symbolic;
31 static int abbrev;
32 static int abbrev_ref;
33 static int abbrev_ref_strict;
34 static int output_sq;
35
36 static int stuck_long;
37 static struct string_list *ref_excludes;
38
39 /*
40 * Some arguments are relevant "revision" arguments,
41 * others are about output format or other details.
42 * This sorts it all out.
43 */
44 static int is_rev_argument(const char *arg)
45 {
46 static const char *rev_args[] = {
47 "--all",
48 "--bisect",
49 "--dense",
50 "--branches=",
51 "--branches",
52 "--header",
53 "--ignore-missing",
54 "--max-age=",
55 "--max-count=",
56 "--min-age=",
57 "--no-merges",
58 "--min-parents=",
59 "--no-min-parents",
60 "--max-parents=",
61 "--no-max-parents",
62 "--objects",
63 "--objects-edge",
64 "--parents",
65 "--pretty",
66 "--remotes=",
67 "--remotes",
68 "--glob=",
69 "--sparse",
70 "--tags=",
71 "--tags",
72 "--topo-order",
73 "--date-order",
74 "--unpacked",
75 NULL
76 };
77 const char **p = rev_args;
78
79 /* accept -<digit>, like traditional "head" */
80 if ((*arg == '-') && isdigit(arg[1]))
81 return 1;
82
83 for (;;) {
84 const char *str = *p++;
85 int len;
86 if (!str)
87 return 0;
88 len = strlen(str);
89 if (!strcmp(arg, str) ||
90 (str[len-1] == '=' && !strncmp(arg, str, len)))
91 return 1;
92 }
93 }
94
95 /* Output argument as a string, either SQ or normal */
96 static void show(const char *arg)
97 {
98 if (output_sq) {
99 int sq = '\'', ch;
100
101 putchar(sq);
102 while ((ch = *arg++)) {
103 if (ch == sq)
104 fputs("'\\'", stdout);
105 putchar(ch);
106 }
107 putchar(sq);
108 putchar(' ');
109 }
110 else
111 puts(arg);
112 }
113
114 /* Like show(), but with a negation prefix according to type */
115 static void show_with_type(int type, const char *arg)
116 {
117 if (type != show_type)
118 putchar('^');
119 show(arg);
120 }
121
122 /* Output a revision, only if filter allows it */
123 static void show_rev(int type, const unsigned char *sha1, const char *name)
124 {
125 if (!(filter & DO_REVS))
126 return;
127 def = NULL;
128
129 if ((symbolic || abbrev_ref) && name) {
130 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
131 unsigned char discard[20];
132 char *full;
133
134 switch (dwim_ref(name, strlen(name), discard, &full)) {
135 case 0:
136 /*
137 * Not found -- not a ref. We could
138 * emit "name" here, but symbolic-full
139 * users are interested in finding the
140 * refs spelled in full, and they would
141 * need to filter non-refs if we did so.
142 */
143 break;
144 case 1: /* happy */
145 if (abbrev_ref)
146 full = shorten_unambiguous_ref(full,
147 abbrev_ref_strict);
148 show_with_type(type, full);
149 break;
150 default: /* ambiguous */
151 error("refname '%s' is ambiguous", name);
152 break;
153 }
154 free(full);
155 } else {
156 show_with_type(type, name);
157 }
158 }
159 else if (abbrev)
160 show_with_type(type, find_unique_abbrev(sha1, abbrev));
161 else
162 show_with_type(type, sha1_to_hex(sha1));
163 }
164
165 /* Output a flag, only if filter allows it. */
166 static int show_flag(const char *arg)
167 {
168 if (!(filter & DO_FLAGS))
169 return 0;
170 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
171 show(arg);
172 return 1;
173 }
174 return 0;
175 }
176
177 static int show_default(void)
178 {
179 const char *s = def;
180
181 if (s) {
182 unsigned char sha1[20];
183
184 def = NULL;
185 if (!get_sha1(s, sha1)) {
186 show_rev(NORMAL, sha1, s);
187 return 1;
188 }
189 }
190 return 0;
191 }
192
193 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
194 {
195 if (ref_excluded(ref_excludes, refname))
196 return 0;
197 show_rev(NORMAL, oid->hash, refname);
198 return 0;
199 }
200
201 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
202 {
203 show_rev(REVERSED, oid->hash, refname);
204 return 0;
205 }
206
207 static int show_abbrev(const unsigned char *sha1, void *cb_data)
208 {
209 show_rev(NORMAL, sha1, NULL);
210 return 0;
211 }
212
213 static void show_datestring(const char *flag, const char *datestr)
214 {
215 static char buffer[100];
216
217 /* date handling requires both flags and revs */
218 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
219 return;
220 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
221 show(buffer);
222 }
223
224 static int show_file(const char *arg, int output_prefix)
225 {
226 show_default();
227 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
228 if (output_prefix) {
229 const char *prefix = startup_info->prefix;
230 show(prefix_filename(prefix,
231 prefix ? strlen(prefix) : 0,
232 arg));
233 } else
234 show(arg);
235 return 1;
236 }
237 return 0;
238 }
239
240 static int try_difference(const char *arg)
241 {
242 char *dotdot;
243 unsigned char sha1[20];
244 unsigned char end[20];
245 const char *next;
246 const char *this;
247 int symmetric;
248 static const char head_by_default[] = "HEAD";
249
250 if (!(dotdot = strstr(arg, "..")))
251 return 0;
252 next = dotdot + 2;
253 this = arg;
254 symmetric = (*next == '.');
255
256 *dotdot = 0;
257 next += symmetric;
258
259 if (!*next)
260 next = head_by_default;
261 if (dotdot == arg)
262 this = head_by_default;
263
264 if (this == head_by_default && next == head_by_default &&
265 !symmetric) {
266 /*
267 * Just ".."? That is not a range but the
268 * pathspec for the parent directory.
269 */
270 *dotdot = '.';
271 return 0;
272 }
273
274 if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
275 show_rev(NORMAL, end, next);
276 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
277 if (symmetric) {
278 struct commit_list *exclude;
279 struct commit *a, *b;
280 a = lookup_commit_reference(sha1);
281 b = lookup_commit_reference(end);
282 exclude = get_merge_bases(a, b);
283 while (exclude) {
284 struct commit *commit = pop_commit(&exclude);
285 show_rev(REVERSED, commit->object.oid.hash, NULL);
286 }
287 }
288 *dotdot = '.';
289 return 1;
290 }
291 *dotdot = '.';
292 return 0;
293 }
294
295 static int try_parent_shorthands(const char *arg)
296 {
297 char *dotdot;
298 unsigned char sha1[20];
299 struct commit *commit;
300 struct commit_list *parents;
301 int parent_number;
302 int include_rev = 0;
303 int include_parents = 0;
304 int exclude_parent = 0;
305
306 if ((dotdot = strstr(arg, "^!"))) {
307 include_rev = 1;
308 if (dotdot[2])
309 return 0;
310 } else if ((dotdot = strstr(arg, "^@"))) {
311 include_parents = 1;
312 if (dotdot[2])
313 return 0;
314 } else if ((dotdot = strstr(arg, "^-"))) {
315 include_rev = 1;
316 exclude_parent = 1;
317
318 if (dotdot[2]) {
319 char *end;
320 exclude_parent = strtoul(dotdot + 2, &end, 10);
321 if (*end != '\0' || !exclude_parent)
322 return 0;
323 }
324 } else
325 return 0;
326
327 *dotdot = 0;
328 if (get_sha1_committish(arg, sha1)) {
329 *dotdot = '^';
330 return 0;
331 }
332
333 commit = lookup_commit_reference(sha1);
334 if (exclude_parent &&
335 exclude_parent > commit_list_count(commit->parents)) {
336 *dotdot = '^';
337 return 0;
338 }
339
340 if (include_rev)
341 show_rev(NORMAL, sha1, arg);
342 for (parents = commit->parents, parent_number = 1;
343 parents;
344 parents = parents->next, parent_number++) {
345 char *name = NULL;
346
347 if (exclude_parent && parent_number != exclude_parent)
348 continue;
349
350 if (symbolic)
351 name = xstrfmt("%s^%d", arg, parent_number);
352 show_rev(include_parents ? NORMAL : REVERSED,
353 parents->item->object.oid.hash, name);
354 free(name);
355 }
356
357 *dotdot = '^';
358 return 1;
359 }
360
361 static int parseopt_dump(const struct option *o, const char *arg, int unset)
362 {
363 struct strbuf *parsed = o->value;
364 if (unset)
365 strbuf_addf(parsed, " --no-%s", o->long_name);
366 else if (o->short_name && (o->long_name == NULL || !stuck_long))
367 strbuf_addf(parsed, " -%c", o->short_name);
368 else
369 strbuf_addf(parsed, " --%s", o->long_name);
370 if (arg) {
371 if (!stuck_long)
372 strbuf_addch(parsed, ' ');
373 else if (o->long_name)
374 strbuf_addch(parsed, '=');
375 sq_quote_buf(parsed, arg);
376 }
377 return 0;
378 }
379
380 static const char *skipspaces(const char *s)
381 {
382 while (isspace(*s))
383 s++;
384 return s;
385 }
386
387 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
388 {
389 static int keep_dashdash = 0, stop_at_non_option = 0;
390 static char const * const parseopt_usage[] = {
391 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
392 NULL
393 };
394 static struct option parseopt_opts[] = {
395 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
396 N_("keep the `--` passed as an arg")),
397 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
398 N_("stop parsing after the "
399 "first non-option argument")),
400 OPT_BOOL(0, "stuck-long", &stuck_long,
401 N_("output in stuck long form")),
402 OPT_END(),
403 };
404 static const char * const flag_chars = "*=?!";
405
406 struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
407 const char **usage = NULL;
408 struct option *opts = NULL;
409 int onb = 0, osz = 0, unb = 0, usz = 0;
410
411 strbuf_addstr(&parsed, "set --");
412 argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
413 PARSE_OPT_KEEP_DASHDASH);
414 if (argc < 1 || strcmp(argv[0], "--"))
415 usage_with_options(parseopt_usage, parseopt_opts);
416
417 /* get the usage up to the first line with a -- on it */
418 for (;;) {
419 if (strbuf_getline(&sb, stdin) == EOF)
420 die("premature end of input");
421 ALLOC_GROW(usage, unb + 1, usz);
422 if (!strcmp("--", sb.buf)) {
423 if (unb < 1)
424 die("no usage string given before the `--' separator");
425 usage[unb] = NULL;
426 break;
427 }
428 usage[unb++] = strbuf_detach(&sb, NULL);
429 }
430
431 /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
432 while (strbuf_getline(&sb, stdin) != EOF) {
433 const char *s;
434 const char *help;
435 struct option *o;
436
437 if (!sb.len)
438 continue;
439
440 ALLOC_GROW(opts, onb + 1, osz);
441 memset(opts + onb, 0, sizeof(opts[onb]));
442
443 o = &opts[onb++];
444 help = strchr(sb.buf, ' ');
445 if (!help || *sb.buf == ' ') {
446 o->type = OPTION_GROUP;
447 o->help = xstrdup(skipspaces(sb.buf));
448 continue;
449 }
450
451 o->type = OPTION_CALLBACK;
452 o->help = xstrdup(skipspaces(help));
453 o->value = &parsed;
454 o->flags = PARSE_OPT_NOARG;
455 o->callback = &parseopt_dump;
456
457 /* name(s) */
458 s = strpbrk(sb.buf, flag_chars);
459 if (s == NULL)
460 s = help;
461
462 if (s - sb.buf == 1) /* short option only */
463 o->short_name = *sb.buf;
464 else if (sb.buf[1] != ',') /* long option only */
465 o->long_name = xmemdupz(sb.buf, s - sb.buf);
466 else {
467 o->short_name = *sb.buf;
468 o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
469 }
470
471 /* flags */
472 while (s < help) {
473 switch (*s++) {
474 case '=':
475 o->flags &= ~PARSE_OPT_NOARG;
476 continue;
477 case '?':
478 o->flags &= ~PARSE_OPT_NOARG;
479 o->flags |= PARSE_OPT_OPTARG;
480 continue;
481 case '!':
482 o->flags |= PARSE_OPT_NONEG;
483 continue;
484 case '*':
485 o->flags |= PARSE_OPT_HIDDEN;
486 continue;
487 }
488 s--;
489 break;
490 }
491
492 if (s < help)
493 o->argh = xmemdupz(s, help - s);
494 }
495 strbuf_release(&sb);
496
497 /* put an OPT_END() */
498 ALLOC_GROW(opts, onb + 1, osz);
499 memset(opts + onb, 0, sizeof(opts[onb]));
500 argc = parse_options(argc, argv, prefix, opts, usage,
501 (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
502 (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
503 PARSE_OPT_SHELL_EVAL);
504
505 strbuf_addstr(&parsed, " --");
506 sq_quote_argv(&parsed, argv, 0);
507 puts(parsed.buf);
508 return 0;
509 }
510
511 static int cmd_sq_quote(int argc, const char **argv)
512 {
513 struct strbuf buf = STRBUF_INIT;
514
515 if (argc)
516 sq_quote_argv(&buf, argv, 0);
517 printf("%s\n", buf.buf);
518 strbuf_release(&buf);
519
520 return 0;
521 }
522
523 static void die_no_single_rev(int quiet)
524 {
525 if (quiet)
526 exit(1);
527 else
528 die("Needed a single revision");
529 }
530
531 static const char builtin_rev_parse_usage[] =
532 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
533 " or: git rev-parse --sq-quote [<arg>...]\n"
534 " or: git rev-parse [<options>] [<arg>...]\n"
535 "\n"
536 "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
537
538 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
539 {
540 int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
541 int did_repo_setup = 0;
542 int has_dashdash = 0;
543 int output_prefix = 0;
544 unsigned char sha1[20];
545 unsigned int flags = 0;
546 const char *name = NULL;
547 struct object_context unused;
548 struct strbuf buf = STRBUF_INIT;
549
550 if (argc > 1 && !strcmp("--parseopt", argv[1]))
551 return cmd_parseopt(argc - 1, argv + 1, prefix);
552
553 if (argc > 1 && !strcmp("--sq-quote", argv[1]))
554 return cmd_sq_quote(argc - 2, argv + 2);
555
556 if (argc > 1 && !strcmp("-h", argv[1]))
557 usage(builtin_rev_parse_usage);
558
559 for (i = 1; i < argc; i++) {
560 if (!strcmp(argv[i], "--")) {
561 has_dashdash = 1;
562 break;
563 }
564 }
565
566 /* No options; just report on whether we're in a git repo or not. */
567 if (argc == 1) {
568 setup_git_directory();
569 git_config(git_default_config, NULL);
570 return 0;
571 }
572
573 for (i = 1; i < argc; i++) {
574 const char *arg = argv[i];
575
576 if (!strcmp(arg, "--local-env-vars")) {
577 int i;
578 for (i = 0; local_repo_env[i]; i++)
579 printf("%s\n", local_repo_env[i]);
580 continue;
581 }
582 if (!strcmp(arg, "--resolve-git-dir")) {
583 const char *gitdir = argv[++i];
584 if (!gitdir)
585 die("--resolve-git-dir requires an argument");
586 gitdir = resolve_gitdir(gitdir);
587 if (!gitdir)
588 die("not a gitdir '%s'", argv[i]);
589 puts(gitdir);
590 continue;
591 }
592
593 /* The rest of the options require a git repository. */
594 if (!did_repo_setup) {
595 prefix = setup_git_directory();
596 git_config(git_default_config, NULL);
597 did_repo_setup = 1;
598 }
599
600 if (!strcmp(arg, "--git-path")) {
601 if (!argv[i + 1])
602 die("--git-path requires an argument");
603 strbuf_reset(&buf);
604 puts(relative_path(git_path("%s", argv[i + 1]),
605 prefix, &buf));
606 i++;
607 continue;
608 }
609 if (as_is) {
610 if (show_file(arg, output_prefix) && as_is < 2)
611 verify_filename(prefix, arg, 0);
612 continue;
613 }
614 if (!strcmp(arg,"-n")) {
615 if (++i >= argc)
616 die("-n requires an argument");
617 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
618 show(arg);
619 show(argv[i]);
620 }
621 continue;
622 }
623 if (starts_with(arg, "-n")) {
624 if ((filter & DO_FLAGS) && (filter & DO_REVS))
625 show(arg);
626 continue;
627 }
628
629 if (*arg == '-') {
630 if (!strcmp(arg, "--")) {
631 as_is = 2;
632 /* Pass on the "--" if we show anything but files.. */
633 if (filter & (DO_FLAGS | DO_REVS))
634 show_file(arg, 0);
635 continue;
636 }
637 if (!strcmp(arg, "--default")) {
638 def = argv[++i];
639 if (!def)
640 die("--default requires an argument");
641 continue;
642 }
643 if (!strcmp(arg, "--prefix")) {
644 prefix = argv[++i];
645 if (!prefix)
646 die("--prefix requires an argument");
647 startup_info->prefix = prefix;
648 output_prefix = 1;
649 continue;
650 }
651 if (!strcmp(arg, "--revs-only")) {
652 filter &= ~DO_NOREV;
653 continue;
654 }
655 if (!strcmp(arg, "--no-revs")) {
656 filter &= ~DO_REVS;
657 continue;
658 }
659 if (!strcmp(arg, "--flags")) {
660 filter &= ~DO_NONFLAGS;
661 continue;
662 }
663 if (!strcmp(arg, "--no-flags")) {
664 filter &= ~DO_FLAGS;
665 continue;
666 }
667 if (!strcmp(arg, "--verify")) {
668 filter &= ~(DO_FLAGS|DO_NOREV);
669 verify = 1;
670 continue;
671 }
672 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
673 quiet = 1;
674 flags |= GET_SHA1_QUIETLY;
675 continue;
676 }
677 if (!strcmp(arg, "--short") ||
678 starts_with(arg, "--short=")) {
679 filter &= ~(DO_FLAGS|DO_NOREV);
680 verify = 1;
681 abbrev = DEFAULT_ABBREV;
682 if (!arg[7])
683 continue;
684 abbrev = strtoul(arg + 8, NULL, 10);
685 if (abbrev < MINIMUM_ABBREV)
686 abbrev = MINIMUM_ABBREV;
687 else if (40 <= abbrev)
688 abbrev = 40;
689 continue;
690 }
691 if (!strcmp(arg, "--sq")) {
692 output_sq = 1;
693 continue;
694 }
695 if (!strcmp(arg, "--not")) {
696 show_type ^= REVERSED;
697 continue;
698 }
699 if (!strcmp(arg, "--symbolic")) {
700 symbolic = SHOW_SYMBOLIC_ASIS;
701 continue;
702 }
703 if (!strcmp(arg, "--symbolic-full-name")) {
704 symbolic = SHOW_SYMBOLIC_FULL;
705 continue;
706 }
707 if (starts_with(arg, "--abbrev-ref") &&
708 (!arg[12] || arg[12] == '=')) {
709 abbrev_ref = 1;
710 abbrev_ref_strict = warn_ambiguous_refs;
711 if (arg[12] == '=') {
712 if (!strcmp(arg + 13, "strict"))
713 abbrev_ref_strict = 1;
714 else if (!strcmp(arg + 13, "loose"))
715 abbrev_ref_strict = 0;
716 else
717 die("unknown mode for %s", arg);
718 }
719 continue;
720 }
721 if (!strcmp(arg, "--all")) {
722 for_each_ref(show_reference, NULL);
723 continue;
724 }
725 if (starts_with(arg, "--disambiguate=")) {
726 for_each_abbrev(arg + 15, show_abbrev, NULL);
727 continue;
728 }
729 if (!strcmp(arg, "--bisect")) {
730 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
731 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
732 continue;
733 }
734 if (starts_with(arg, "--branches=")) {
735 for_each_glob_ref_in(show_reference, arg + 11,
736 "refs/heads/", NULL);
737 clear_ref_exclusion(&ref_excludes);
738 continue;
739 }
740 if (!strcmp(arg, "--branches")) {
741 for_each_branch_ref(show_reference, NULL);
742 clear_ref_exclusion(&ref_excludes);
743 continue;
744 }
745 if (starts_with(arg, "--tags=")) {
746 for_each_glob_ref_in(show_reference, arg + 7,
747 "refs/tags/", NULL);
748 clear_ref_exclusion(&ref_excludes);
749 continue;
750 }
751 if (!strcmp(arg, "--tags")) {
752 for_each_tag_ref(show_reference, NULL);
753 clear_ref_exclusion(&ref_excludes);
754 continue;
755 }
756 if (starts_with(arg, "--glob=")) {
757 for_each_glob_ref(show_reference, arg + 7, NULL);
758 clear_ref_exclusion(&ref_excludes);
759 continue;
760 }
761 if (starts_with(arg, "--remotes=")) {
762 for_each_glob_ref_in(show_reference, arg + 10,
763 "refs/remotes/", NULL);
764 clear_ref_exclusion(&ref_excludes);
765 continue;
766 }
767 if (!strcmp(arg, "--remotes")) {
768 for_each_remote_ref(show_reference, NULL);
769 clear_ref_exclusion(&ref_excludes);
770 continue;
771 }
772 if (starts_with(arg, "--exclude=")) {
773 add_ref_exclusion(&ref_excludes, arg + 10);
774 continue;
775 }
776 if (!strcmp(arg, "--show-toplevel")) {
777 const char *work_tree = get_git_work_tree();
778 if (work_tree)
779 puts(work_tree);
780 continue;
781 }
782 if (!strcmp(arg, "--show-prefix")) {
783 if (prefix)
784 puts(prefix);
785 else
786 putchar('\n');
787 continue;
788 }
789 if (!strcmp(arg, "--show-cdup")) {
790 const char *pfx = prefix;
791 if (!is_inside_work_tree()) {
792 const char *work_tree =
793 get_git_work_tree();
794 if (work_tree)
795 printf("%s\n", work_tree);
796 continue;
797 }
798 while (pfx) {
799 pfx = strchr(pfx, '/');
800 if (pfx) {
801 pfx++;
802 printf("../");
803 }
804 }
805 putchar('\n');
806 continue;
807 }
808 if (!strcmp(arg, "--git-dir") ||
809 !strcmp(arg, "--absolute-git-dir")) {
810 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
811 char *cwd;
812 int len;
813 if (arg[2] == 'g') { /* --git-dir */
814 if (gitdir) {
815 puts(gitdir);
816 continue;
817 }
818 if (!prefix) {
819 puts(".git");
820 continue;
821 }
822 } else { /* --absolute-git-dir */
823 if (!gitdir && !prefix)
824 gitdir = ".git";
825 if (gitdir) {
826 puts(real_path(gitdir));
827 continue;
828 }
829 }
830 cwd = xgetcwd();
831 len = strlen(cwd);
832 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
833 free(cwd);
834 continue;
835 }
836 if (!strcmp(arg, "--git-common-dir")) {
837 strbuf_reset(&buf);
838 puts(relative_path(get_git_common_dir(),
839 prefix, &buf));
840 continue;
841 }
842 if (!strcmp(arg, "--is-inside-git-dir")) {
843 printf("%s\n", is_inside_git_dir() ? "true"
844 : "false");
845 continue;
846 }
847 if (!strcmp(arg, "--is-inside-work-tree")) {
848 printf("%s\n", is_inside_work_tree() ? "true"
849 : "false");
850 continue;
851 }
852 if (!strcmp(arg, "--is-bare-repository")) {
853 printf("%s\n", is_bare_repository() ? "true"
854 : "false");
855 continue;
856 }
857 if (!strcmp(arg, "--shared-index-path")) {
858 if (read_cache() < 0)
859 die(_("Could not read the index"));
860 if (the_index.split_index) {
861 const unsigned char *sha1 = the_index.split_index->base_sha1;
862 const char *path = git_path("sharedindex.%s", sha1_to_hex(sha1));
863 strbuf_reset(&buf);
864 puts(relative_path(path, prefix, &buf));
865 }
866 continue;
867 }
868 if (starts_with(arg, "--since=")) {
869 show_datestring("--max-age=", arg+8);
870 continue;
871 }
872 if (starts_with(arg, "--after=")) {
873 show_datestring("--max-age=", arg+8);
874 continue;
875 }
876 if (starts_with(arg, "--before=")) {
877 show_datestring("--min-age=", arg+9);
878 continue;
879 }
880 if (starts_with(arg, "--until=")) {
881 show_datestring("--min-age=", arg+8);
882 continue;
883 }
884 if (show_flag(arg) && verify)
885 die_no_single_rev(quiet);
886 continue;
887 }
888
889 /* Not a flag argument */
890 if (try_difference(arg))
891 continue;
892 if (try_parent_shorthands(arg))
893 continue;
894 name = arg;
895 type = NORMAL;
896 if (*arg == '^') {
897 name++;
898 type = REVERSED;
899 }
900 if (!get_sha1_with_context(name, flags, sha1, &unused)) {
901 if (verify)
902 revs_count++;
903 else
904 show_rev(type, sha1, name);
905 continue;
906 }
907 if (verify)
908 die_no_single_rev(quiet);
909 if (has_dashdash)
910 die("bad revision '%s'", arg);
911 as_is = 1;
912 if (!show_file(arg, output_prefix))
913 continue;
914 verify_filename(prefix, arg, 1);
915 }
916 strbuf_release(&buf);
917 if (verify) {
918 if (revs_count == 1) {
919 show_rev(type, sha1, name);
920 return 0;
921 } else if (revs_count == 0 && show_default())
922 return 0;
923 die_no_single_rev(quiet);
924 } else
925 show_default();
926 return 0;
927 }