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