Merge branch 'sb/submodule-recursive-fetch-gets-the-tip'
[git] / builtin / rev-parse.c
1 /*
2  * rev-parse.c
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "config.h"
8 #include "commit.h"
9 #include "refs.h"
10 #include "quote.h"
11 #include "builtin.h"
12 #include "parse-options.h"
13 #include "diff.h"
14 #include "revision.h"
15 #include "split-index.h"
16 #include "submodule.h"
17 #include "commit-reach.h"
18
19 #define DO_REVS         1
20 #define DO_NOREV        2
21 #define DO_FLAGS        4
22 #define DO_NONFLAGS     8
23 static int filter = ~0;
24
25 static const char *def;
26
27 #define NORMAL 0
28 #define REVERSED 1
29 static int show_type = NORMAL;
30
31 #define SHOW_SYMBOLIC_ASIS 1
32 #define SHOW_SYMBOLIC_FULL 2
33 static int symbolic;
34 static int abbrev;
35 static int abbrev_ref;
36 static int abbrev_ref_strict;
37 static int output_sq;
38
39 static int stuck_long;
40 static struct string_list *ref_excludes;
41
42 /*
43  * Some arguments are relevant "revision" arguments,
44  * others are about output format or other details.
45  * This sorts it all out.
46  */
47 static int is_rev_argument(const char *arg)
48 {
49         static const char *rev_args[] = {
50                 "--all",
51                 "--bisect",
52                 "--dense",
53                 "--branches=",
54                 "--branches",
55                 "--header",
56                 "--ignore-missing",
57                 "--max-age=",
58                 "--max-count=",
59                 "--min-age=",
60                 "--no-merges",
61                 "--min-parents=",
62                 "--no-min-parents",
63                 "--max-parents=",
64                 "--no-max-parents",
65                 "--objects",
66                 "--objects-edge",
67                 "--parents",
68                 "--pretty",
69                 "--remotes=",
70                 "--remotes",
71                 "--glob=",
72                 "--sparse",
73                 "--tags=",
74                 "--tags",
75                 "--topo-order",
76                 "--date-order",
77                 "--unpacked",
78                 NULL
79         };
80         const char **p = rev_args;
81
82         /* accept -<digit>, like traditional "head" */
83         if ((*arg == '-') && isdigit(arg[1]))
84                 return 1;
85
86         for (;;) {
87                 const char *str = *p++;
88                 int len;
89                 if (!str)
90                         return 0;
91                 len = strlen(str);
92                 if (!strcmp(arg, str) ||
93                     (str[len-1] == '=' && !strncmp(arg, str, len)))
94                         return 1;
95         }
96 }
97
98 /* Output argument as a string, either SQ or normal */
99 static void show(const char *arg)
100 {
101         if (output_sq) {
102                 int sq = '\'', ch;
103
104                 putchar(sq);
105                 while ((ch = *arg++)) {
106                         if (ch == sq)
107                                 fputs("'\\'", stdout);
108                         putchar(ch);
109                 }
110                 putchar(sq);
111                 putchar(' ');
112         }
113         else
114                 puts(arg);
115 }
116
117 /* Like show(), but with a negation prefix according to type */
118 static void show_with_type(int type, const char *arg)
119 {
120         if (type != show_type)
121                 putchar('^');
122         show(arg);
123 }
124
125 /* Output a revision, only if filter allows it */
126 static void show_rev(int type, const struct object_id *oid, const char *name)
127 {
128         if (!(filter & DO_REVS))
129                 return;
130         def = NULL;
131
132         if ((symbolic || abbrev_ref) && name) {
133                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
134                         struct object_id discard;
135                         char *full;
136
137                         switch (dwim_ref(name, strlen(name), &discard, &full)) {
138                         case 0:
139                                 /*
140                                  * Not found -- not a ref.  We could
141                                  * emit "name" here, but symbolic-full
142                                  * users are interested in finding the
143                                  * refs spelled in full, and they would
144                                  * need to filter non-refs if we did so.
145                                  */
146                                 break;
147                         case 1: /* happy */
148                                 if (abbrev_ref)
149                                         full = shorten_unambiguous_ref(full,
150                                                 abbrev_ref_strict);
151                                 show_with_type(type, full);
152                                 break;
153                         default: /* ambiguous */
154                                 error("refname '%s' is ambiguous", name);
155                                 break;
156                         }
157                         free(full);
158                 } else {
159                         show_with_type(type, name);
160                 }
161         }
162         else if (abbrev)
163                 show_with_type(type, find_unique_abbrev(oid, abbrev));
164         else
165                 show_with_type(type, oid_to_hex(oid));
166 }
167
168 /* Output a flag, only if filter allows it. */
169 static int show_flag(const char *arg)
170 {
171         if (!(filter & DO_FLAGS))
172                 return 0;
173         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
174                 show(arg);
175                 return 1;
176         }
177         return 0;
178 }
179
180 static int show_default(void)
181 {
182         const char *s = def;
183
184         if (s) {
185                 struct object_id oid;
186
187                 def = NULL;
188                 if (!get_oid(s, &oid)) {
189                         show_rev(NORMAL, &oid, s);
190                         return 1;
191                 }
192         }
193         return 0;
194 }
195
196 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
197 {
198         if (ref_excluded(ref_excludes, refname))
199                 return 0;
200         show_rev(NORMAL, oid, refname);
201         return 0;
202 }
203
204 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
205 {
206         show_rev(REVERSED, oid, refname);
207         return 0;
208 }
209
210 static int show_abbrev(const struct object_id *oid, void *cb_data)
211 {
212         show_rev(NORMAL, oid, NULL);
213         return 0;
214 }
215
216 static void show_datestring(const char *flag, const char *datestr)
217 {
218         char *buffer;
219
220         /* date handling requires both flags and revs */
221         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
222                 return;
223         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
224         show(buffer);
225         free(buffer);
226 }
227
228 static int show_file(const char *arg, int output_prefix)
229 {
230         show_default();
231         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
232                 if (output_prefix) {
233                         const char *prefix = startup_info->prefix;
234                         char *fname = prefix_filename(prefix, arg);
235                         show(fname);
236                         free(fname);
237                 } else
238                         show(arg);
239                 return 1;
240         }
241         return 0;
242 }
243
244 static int try_difference(const char *arg)
245 {
246         char *dotdot;
247         struct object_id start_oid;
248         struct object_id end_oid;
249         const char *end;
250         const char *start;
251         int symmetric;
252         static const char head_by_default[] = "HEAD";
253
254         if (!(dotdot = strstr(arg, "..")))
255                 return 0;
256         end = dotdot + 2;
257         start = arg;
258         symmetric = (*end == '.');
259
260         *dotdot = 0;
261         end += symmetric;
262
263         if (!*end)
264                 end = head_by_default;
265         if (dotdot == arg)
266                 start = head_by_default;
267
268         if (start == head_by_default && end == head_by_default &&
269             !symmetric) {
270                 /*
271                  * Just ".."?  That is not a range but the
272                  * pathspec for the parent directory.
273                  */
274                 *dotdot = '.';
275                 return 0;
276         }
277
278         if (!get_oid_committish(start, &start_oid) && !get_oid_committish(end, &end_oid)) {
279                 show_rev(NORMAL, &end_oid, end);
280                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
281                 if (symmetric) {
282                         struct commit_list *exclude;
283                         struct commit *a, *b;
284                         a = lookup_commit_reference(the_repository, &start_oid);
285                         b = lookup_commit_reference(the_repository, &end_oid);
286                         if (!a || !b) {
287                                 *dotdot = '.';
288                                 return 0;
289                         }
290                         exclude = get_merge_bases(a, b);
291                         while (exclude) {
292                                 struct commit *commit = pop_commit(&exclude);
293                                 show_rev(REVERSED, &commit->object.oid, NULL);
294                         }
295                 }
296                 *dotdot = '.';
297                 return 1;
298         }
299         *dotdot = '.';
300         return 0;
301 }
302
303 static int try_parent_shorthands(const char *arg)
304 {
305         char *dotdot;
306         struct object_id oid;
307         struct commit *commit;
308         struct commit_list *parents;
309         int parent_number;
310         int include_rev = 0;
311         int include_parents = 0;
312         int exclude_parent = 0;
313
314         if ((dotdot = strstr(arg, "^!"))) {
315                 include_rev = 1;
316                 if (dotdot[2])
317                         return 0;
318         } else if ((dotdot = strstr(arg, "^@"))) {
319                 include_parents = 1;
320                 if (dotdot[2])
321                         return 0;
322         } else if ((dotdot = strstr(arg, "^-"))) {
323                 include_rev = 1;
324                 exclude_parent = 1;
325
326                 if (dotdot[2]) {
327                         char *end;
328                         exclude_parent = strtoul(dotdot + 2, &end, 10);
329                         if (*end != '\0' || !exclude_parent)
330                                 return 0;
331                 }
332         } else
333                 return 0;
334
335         *dotdot = 0;
336         if (get_oid_committish(arg, &oid) ||
337             !(commit = lookup_commit_reference(the_repository, &oid))) {
338                 *dotdot = '^';
339                 return 0;
340         }
341
342         if (exclude_parent &&
343             exclude_parent > commit_list_count(commit->parents)) {
344                 *dotdot = '^';
345                 return 0;
346         }
347
348         if (include_rev)
349                 show_rev(NORMAL, &oid, arg);
350         for (parents = commit->parents, parent_number = 1;
351              parents;
352              parents = parents->next, parent_number++) {
353                 char *name = NULL;
354
355                 if (exclude_parent && parent_number != exclude_parent)
356                         continue;
357
358                 if (symbolic)
359                         name = xstrfmt("%s^%d", arg, parent_number);
360                 show_rev(include_parents ? NORMAL : REVERSED,
361                          &parents->item->object.oid, name);
362                 free(name);
363         }
364
365         *dotdot = '^';
366         return 1;
367 }
368
369 static int parseopt_dump(const struct option *o, const char *arg, int unset)
370 {
371         struct strbuf *parsed = o->value;
372         if (unset)
373                 strbuf_addf(parsed, " --no-%s", o->long_name);
374         else if (o->short_name && (o->long_name == NULL || !stuck_long))
375                 strbuf_addf(parsed, " -%c", o->short_name);
376         else
377                 strbuf_addf(parsed, " --%s", o->long_name);
378         if (arg) {
379                 if (!stuck_long)
380                         strbuf_addch(parsed, ' ');
381                 else if (o->long_name)
382                         strbuf_addch(parsed, '=');
383                 sq_quote_buf(parsed, arg);
384         }
385         return 0;
386 }
387
388 static const char *skipspaces(const char *s)
389 {
390         while (isspace(*s))
391                 s++;
392         return s;
393 }
394
395 static char *findspace(const char *s)
396 {
397         for (; *s; s++)
398                 if (isspace(*s))
399                         return (char*)s;
400         return NULL;
401 }
402
403 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
404 {
405         static int keep_dashdash = 0, stop_at_non_option = 0;
406         static char const * const parseopt_usage[] = {
407                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
408                 NULL
409         };
410         static struct option parseopt_opts[] = {
411                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
412                                         N_("keep the `--` passed as an arg")),
413                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
414                                         N_("stop parsing after the "
415                                            "first non-option argument")),
416                 OPT_BOOL(0, "stuck-long", &stuck_long,
417                                         N_("output in stuck long form")),
418                 OPT_END(),
419         };
420         static const char * const flag_chars = "*=?!";
421
422         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
423         const char **usage = NULL;
424         struct option *opts = NULL;
425         int onb = 0, osz = 0, unb = 0, usz = 0;
426
427         strbuf_addstr(&parsed, "set --");
428         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
429                              PARSE_OPT_KEEP_DASHDASH);
430         if (argc < 1 || strcmp(argv[0], "--"))
431                 usage_with_options(parseopt_usage, parseopt_opts);
432
433         /* get the usage up to the first line with a -- on it */
434         for (;;) {
435                 if (strbuf_getline(&sb, stdin) == EOF)
436                         die("premature end of input");
437                 ALLOC_GROW(usage, unb + 1, usz);
438                 if (!strcmp("--", sb.buf)) {
439                         if (unb < 1)
440                                 die("no usage string given before the `--' separator");
441                         usage[unb] = NULL;
442                         break;
443                 }
444                 usage[unb++] = strbuf_detach(&sb, NULL);
445         }
446
447         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
448         while (strbuf_getline(&sb, stdin) != EOF) {
449                 const char *s;
450                 char *help;
451                 struct option *o;
452
453                 if (!sb.len)
454                         continue;
455
456                 ALLOC_GROW(opts, onb + 1, osz);
457                 memset(opts + onb, 0, sizeof(opts[onb]));
458
459                 o = &opts[onb++];
460                 help = findspace(sb.buf);
461                 if (!help || sb.buf == help) {
462                         o->type = OPTION_GROUP;
463                         o->help = xstrdup(skipspaces(sb.buf));
464                         continue;
465                 }
466
467                 *help = '\0';
468
469                 o->type = OPTION_CALLBACK;
470                 o->help = xstrdup(skipspaces(help+1));
471                 o->value = &parsed;
472                 o->flags = PARSE_OPT_NOARG;
473                 o->callback = &parseopt_dump;
474
475                 /* name(s) */
476                 s = strpbrk(sb.buf, flag_chars);
477                 if (s == NULL)
478                         s = help;
479
480                 if (s - sb.buf == 1) /* short option only */
481                         o->short_name = *sb.buf;
482                 else if (sb.buf[1] != ',') /* long option only */
483                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
484                 else {
485                         o->short_name = *sb.buf;
486                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
487                 }
488
489                 /* flags */
490                 while (s < help) {
491                         switch (*s++) {
492                         case '=':
493                                 o->flags &= ~PARSE_OPT_NOARG;
494                                 continue;
495                         case '?':
496                                 o->flags &= ~PARSE_OPT_NOARG;
497                                 o->flags |= PARSE_OPT_OPTARG;
498                                 continue;
499                         case '!':
500                                 o->flags |= PARSE_OPT_NONEG;
501                                 continue;
502                         case '*':
503                                 o->flags |= PARSE_OPT_HIDDEN;
504                                 continue;
505                         }
506                         s--;
507                         break;
508                 }
509
510                 if (s < help)
511                         o->argh = xmemdupz(s, help - s);
512         }
513         strbuf_release(&sb);
514
515         /* put an OPT_END() */
516         ALLOC_GROW(opts, onb + 1, osz);
517         memset(opts + onb, 0, sizeof(opts[onb]));
518         argc = parse_options(argc, argv, prefix, opts, usage,
519                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
520                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
521                         PARSE_OPT_SHELL_EVAL);
522
523         strbuf_addstr(&parsed, " --");
524         sq_quote_argv(&parsed, argv);
525         puts(parsed.buf);
526         return 0;
527 }
528
529 static int cmd_sq_quote(int argc, const char **argv)
530 {
531         struct strbuf buf = STRBUF_INIT;
532
533         if (argc)
534                 sq_quote_argv(&buf, argv);
535         printf("%s\n", buf.buf);
536         strbuf_release(&buf);
537
538         return 0;
539 }
540
541 static void die_no_single_rev(int quiet)
542 {
543         if (quiet)
544                 exit(1);
545         else
546                 die("Needed a single revision");
547 }
548
549 static const char builtin_rev_parse_usage[] =
550 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
551    "   or: git rev-parse --sq-quote [<arg>...]\n"
552    "   or: git rev-parse [<options>] [<arg>...]\n"
553    "\n"
554    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
555
556 /*
557  * Parse "opt" or "opt=<value>", setting value respectively to either
558  * NULL or the string after "=".
559  */
560 static int opt_with_value(const char *arg, const char *opt, const char **value)
561 {
562         if (skip_prefix(arg, opt, &arg)) {
563                 if (!*arg) {
564                         *value = NULL;
565                         return 1;
566                 }
567                 if (*arg++ == '=') {
568                         *value = arg;
569                         return 1;
570                 }
571         }
572         return 0;
573 }
574
575 static void handle_ref_opt(const char *pattern, const char *prefix)
576 {
577         if (pattern)
578                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
579         else
580                 for_each_ref_in(prefix, show_reference, NULL);
581         clear_ref_exclusion(&ref_excludes);
582 }
583
584 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
585 {
586         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
587         int did_repo_setup = 0;
588         int has_dashdash = 0;
589         int output_prefix = 0;
590         struct object_id oid;
591         unsigned int flags = 0;
592         const char *name = NULL;
593         struct object_context unused;
594         struct strbuf buf = STRBUF_INIT;
595
596         if (argc > 1 && !strcmp("--parseopt", argv[1]))
597                 return cmd_parseopt(argc - 1, argv + 1, prefix);
598
599         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
600                 return cmd_sq_quote(argc - 2, argv + 2);
601
602         if (argc > 1 && !strcmp("-h", argv[1]))
603                 usage(builtin_rev_parse_usage);
604
605         for (i = 1; i < argc; i++) {
606                 if (!strcmp(argv[i], "--")) {
607                         has_dashdash = 1;
608                         break;
609                 }
610         }
611
612         /* No options; just report on whether we're in a git repo or not. */
613         if (argc == 1) {
614                 setup_git_directory();
615                 git_config(git_default_config, NULL);
616                 return 0;
617         }
618
619         for (i = 1; i < argc; i++) {
620                 const char *arg = argv[i];
621
622                 if (!strcmp(arg, "--local-env-vars")) {
623                         int i;
624                         for (i = 0; local_repo_env[i]; i++)
625                                 printf("%s\n", local_repo_env[i]);
626                         continue;
627                 }
628                 if (!strcmp(arg, "--resolve-git-dir")) {
629                         const char *gitdir = argv[++i];
630                         if (!gitdir)
631                                 die("--resolve-git-dir requires an argument");
632                         gitdir = resolve_gitdir(gitdir);
633                         if (!gitdir)
634                                 die("not a gitdir '%s'", argv[i]);
635                         puts(gitdir);
636                         continue;
637                 }
638
639                 /* The rest of the options require a git repository. */
640                 if (!did_repo_setup) {
641                         prefix = setup_git_directory();
642                         git_config(git_default_config, NULL);
643                         did_repo_setup = 1;
644                 }
645
646                 if (!strcmp(arg, "--git-path")) {
647                         if (!argv[i + 1])
648                                 die("--git-path requires an argument");
649                         strbuf_reset(&buf);
650                         puts(relative_path(git_path("%s", argv[i + 1]),
651                                            prefix, &buf));
652                         i++;
653                         continue;
654                 }
655                 if (as_is) {
656                         if (show_file(arg, output_prefix) && as_is < 2)
657                                 verify_filename(prefix, arg, 0);
658                         continue;
659                 }
660                 if (!strcmp(arg,"-n")) {
661                         if (++i >= argc)
662                                 die("-n requires an argument");
663                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
664                                 show(arg);
665                                 show(argv[i]);
666                         }
667                         continue;
668                 }
669                 if (starts_with(arg, "-n")) {
670                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
671                                 show(arg);
672                         continue;
673                 }
674
675                 if (*arg == '-') {
676                         if (!strcmp(arg, "--")) {
677                                 as_is = 2;
678                                 /* Pass on the "--" if we show anything but files.. */
679                                 if (filter & (DO_FLAGS | DO_REVS))
680                                         show_file(arg, 0);
681                                 continue;
682                         }
683                         if (!strcmp(arg, "--default")) {
684                                 def = argv[++i];
685                                 if (!def)
686                                         die("--default requires an argument");
687                                 continue;
688                         }
689                         if (!strcmp(arg, "--prefix")) {
690                                 prefix = argv[++i];
691                                 if (!prefix)
692                                         die("--prefix requires an argument");
693                                 startup_info->prefix = prefix;
694                                 output_prefix = 1;
695                                 continue;
696                         }
697                         if (!strcmp(arg, "--revs-only")) {
698                                 filter &= ~DO_NOREV;
699                                 continue;
700                         }
701                         if (!strcmp(arg, "--no-revs")) {
702                                 filter &= ~DO_REVS;
703                                 continue;
704                         }
705                         if (!strcmp(arg, "--flags")) {
706                                 filter &= ~DO_NONFLAGS;
707                                 continue;
708                         }
709                         if (!strcmp(arg, "--no-flags")) {
710                                 filter &= ~DO_FLAGS;
711                                 continue;
712                         }
713                         if (!strcmp(arg, "--verify")) {
714                                 filter &= ~(DO_FLAGS|DO_NOREV);
715                                 verify = 1;
716                                 continue;
717                         }
718                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
719                                 quiet = 1;
720                                 flags |= GET_OID_QUIETLY;
721                                 continue;
722                         }
723                         if (opt_with_value(arg, "--short", &arg)) {
724                                 filter &= ~(DO_FLAGS|DO_NOREV);
725                                 verify = 1;
726                                 abbrev = DEFAULT_ABBREV;
727                                 if (!arg)
728                                         continue;
729                                 abbrev = strtoul(arg, NULL, 10);
730                                 if (abbrev < MINIMUM_ABBREV)
731                                         abbrev = MINIMUM_ABBREV;
732                                 else if (40 <= abbrev)
733                                         abbrev = 40;
734                                 continue;
735                         }
736                         if (!strcmp(arg, "--sq")) {
737                                 output_sq = 1;
738                                 continue;
739                         }
740                         if (!strcmp(arg, "--not")) {
741                                 show_type ^= REVERSED;
742                                 continue;
743                         }
744                         if (!strcmp(arg, "--symbolic")) {
745                                 symbolic = SHOW_SYMBOLIC_ASIS;
746                                 continue;
747                         }
748                         if (!strcmp(arg, "--symbolic-full-name")) {
749                                 symbolic = SHOW_SYMBOLIC_FULL;
750                                 continue;
751                         }
752                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
753                                 abbrev_ref = 1;
754                                 abbrev_ref_strict = warn_ambiguous_refs;
755                                 if (arg) {
756                                         if (!strcmp(arg, "strict"))
757                                                 abbrev_ref_strict = 1;
758                                         else if (!strcmp(arg, "loose"))
759                                                 abbrev_ref_strict = 0;
760                                         else
761                                                 die("unknown mode for --abbrev-ref: %s",
762                                                     arg);
763                                 }
764                                 continue;
765                         }
766                         if (!strcmp(arg, "--all")) {
767                                 for_each_ref(show_reference, NULL);
768                                 clear_ref_exclusion(&ref_excludes);
769                                 continue;
770                         }
771                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
772                                 for_each_abbrev(arg, show_abbrev, NULL);
773                                 continue;
774                         }
775                         if (!strcmp(arg, "--bisect")) {
776                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
777                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
778                                 continue;
779                         }
780                         if (opt_with_value(arg, "--branches", &arg)) {
781                                 handle_ref_opt(arg, "refs/heads/");
782                                 continue;
783                         }
784                         if (opt_with_value(arg, "--tags", &arg)) {
785                                 handle_ref_opt(arg, "refs/tags/");
786                                 continue;
787                         }
788                         if (skip_prefix(arg, "--glob=", &arg)) {
789                                 handle_ref_opt(arg, NULL);
790                                 continue;
791                         }
792                         if (opt_with_value(arg, "--remotes", &arg)) {
793                                 handle_ref_opt(arg, "refs/remotes/");
794                                 continue;
795                         }
796                         if (skip_prefix(arg, "--exclude=", &arg)) {
797                                 add_ref_exclusion(&ref_excludes, arg);
798                                 continue;
799                         }
800                         if (!strcmp(arg, "--show-toplevel")) {
801                                 const char *work_tree = get_git_work_tree();
802                                 if (work_tree)
803                                         puts(work_tree);
804                                 continue;
805                         }
806                         if (!strcmp(arg, "--show-superproject-working-tree")) {
807                                 const char *superproject = get_superproject_working_tree();
808                                 if (superproject)
809                                         puts(superproject);
810                                 continue;
811                         }
812                         if (!strcmp(arg, "--show-prefix")) {
813                                 if (prefix)
814                                         puts(prefix);
815                                 else
816                                         putchar('\n');
817                                 continue;
818                         }
819                         if (!strcmp(arg, "--show-cdup")) {
820                                 const char *pfx = prefix;
821                                 if (!is_inside_work_tree()) {
822                                         const char *work_tree =
823                                                 get_git_work_tree();
824                                         if (work_tree)
825                                                 printf("%s\n", work_tree);
826                                         continue;
827                                 }
828                                 while (pfx) {
829                                         pfx = strchr(pfx, '/');
830                                         if (pfx) {
831                                                 pfx++;
832                                                 printf("../");
833                                         }
834                                 }
835                                 putchar('\n');
836                                 continue;
837                         }
838                         if (!strcmp(arg, "--git-dir") ||
839                             !strcmp(arg, "--absolute-git-dir")) {
840                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
841                                 char *cwd;
842                                 int len;
843                                 if (arg[2] == 'g') {    /* --git-dir */
844                                         if (gitdir) {
845                                                 puts(gitdir);
846                                                 continue;
847                                         }
848                                         if (!prefix) {
849                                                 puts(".git");
850                                                 continue;
851                                         }
852                                 } else {                /* --absolute-git-dir */
853                                         if (!gitdir && !prefix)
854                                                 gitdir = ".git";
855                                         if (gitdir) {
856                                                 puts(real_path(gitdir));
857                                                 continue;
858                                         }
859                                 }
860                                 cwd = xgetcwd();
861                                 len = strlen(cwd);
862                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
863                                 free(cwd);
864                                 continue;
865                         }
866                         if (!strcmp(arg, "--git-common-dir")) {
867                                 strbuf_reset(&buf);
868                                 puts(relative_path(get_git_common_dir(),
869                                                    prefix, &buf));
870                                 continue;
871                         }
872                         if (!strcmp(arg, "--is-inside-git-dir")) {
873                                 printf("%s\n", is_inside_git_dir() ? "true"
874                                                 : "false");
875                                 continue;
876                         }
877                         if (!strcmp(arg, "--is-inside-work-tree")) {
878                                 printf("%s\n", is_inside_work_tree() ? "true"
879                                                 : "false");
880                                 continue;
881                         }
882                         if (!strcmp(arg, "--is-bare-repository")) {
883                                 printf("%s\n", is_bare_repository() ? "true"
884                                                 : "false");
885                                 continue;
886                         }
887                         if (!strcmp(arg, "--is-shallow-repository")) {
888                                 printf("%s\n",
889                                                 is_repository_shallow(the_repository) ? "true"
890                                                 : "false");
891                                 continue;
892                         }
893                         if (!strcmp(arg, "--shared-index-path")) {
894                                 if (read_cache() < 0)
895                                         die(_("Could not read the index"));
896                                 if (the_index.split_index) {
897                                         const struct object_id *oid = &the_index.split_index->base_oid;
898                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
899                                         strbuf_reset(&buf);
900                                         puts(relative_path(path, prefix, &buf));
901                                 }
902                                 continue;
903                         }
904                         if (skip_prefix(arg, "--since=", &arg)) {
905                                 show_datestring("--max-age=", arg);
906                                 continue;
907                         }
908                         if (skip_prefix(arg, "--after=", &arg)) {
909                                 show_datestring("--max-age=", arg);
910                                 continue;
911                         }
912                         if (skip_prefix(arg, "--before=", &arg)) {
913                                 show_datestring("--min-age=", arg);
914                                 continue;
915                         }
916                         if (skip_prefix(arg, "--until=", &arg)) {
917                                 show_datestring("--min-age=", arg);
918                                 continue;
919                         }
920                         if (show_flag(arg) && verify)
921                                 die_no_single_rev(quiet);
922                         continue;
923                 }
924
925                 /* Not a flag argument */
926                 if (try_difference(arg))
927                         continue;
928                 if (try_parent_shorthands(arg))
929                         continue;
930                 name = arg;
931                 type = NORMAL;
932                 if (*arg == '^') {
933                         name++;
934                         type = REVERSED;
935                 }
936                 if (!get_oid_with_context(name, flags, &oid, &unused)) {
937                         if (verify)
938                                 revs_count++;
939                         else
940                                 show_rev(type, &oid, name);
941                         continue;
942                 }
943                 if (verify)
944                         die_no_single_rev(quiet);
945                 if (has_dashdash)
946                         die("bad revision '%s'", arg);
947                 as_is = 1;
948                 if (!show_file(arg, output_prefix))
949                         continue;
950                 verify_filename(prefix, arg, 1);
951         }
952         strbuf_release(&buf);
953         if (verify) {
954                 if (revs_count == 1) {
955                         show_rev(type, &oid, name);
956                         return 0;
957                 } else if (revs_count == 0 && show_default())
958                         return 0;
959                 die_no_single_rev(quiet);
960         } else
961                 show_default();
962         return 0;
963 }