Merge branch 'jt/curl-verbose-on-trace-curl'
[git] / builtin / rev-parse.c
1 /*
2  * rev-parse.c
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #define USE_THE_INDEX_COMPATIBILITY_MACROS
7 #include "cache.h"
8 #include "config.h"
9 #include "commit.h"
10 #include "refs.h"
11 #include "quote.h"
12 #include "builtin.h"
13 #include "parse-options.h"
14 #include "diff.h"
15 #include "revision.h"
16 #include "split-index.h"
17 #include "submodule.h"
18 #include "commit-reach.h"
19 #include "shallow.h"
20
21 #define DO_REVS         1
22 #define DO_NOREV        2
23 #define DO_FLAGS        4
24 #define DO_NONFLAGS     8
25 static int filter = ~0;
26
27 static const char *def;
28
29 #define NORMAL 0
30 #define REVERSED 1
31 static int show_type = NORMAL;
32
33 #define SHOW_SYMBOLIC_ASIS 1
34 #define SHOW_SYMBOLIC_FULL 2
35 static int symbolic;
36 static int abbrev;
37 static int abbrev_ref;
38 static int abbrev_ref_strict;
39 static int output_sq;
40
41 static int stuck_long;
42 static struct string_list *ref_excludes;
43
44 /*
45  * Some arguments are relevant "revision" arguments,
46  * others are about output format or other details.
47  * This sorts it all out.
48  */
49 static int is_rev_argument(const char *arg)
50 {
51         static const char *rev_args[] = {
52                 "--all",
53                 "--bisect",
54                 "--dense",
55                 "--branches=",
56                 "--branches",
57                 "--header",
58                 "--ignore-missing",
59                 "--max-age=",
60                 "--max-count=",
61                 "--min-age=",
62                 "--no-merges",
63                 "--min-parents=",
64                 "--no-min-parents",
65                 "--max-parents=",
66                 "--no-max-parents",
67                 "--objects",
68                 "--objects-edge",
69                 "--parents",
70                 "--pretty",
71                 "--remotes=",
72                 "--remotes",
73                 "--glob=",
74                 "--sparse",
75                 "--tags=",
76                 "--tags",
77                 "--topo-order",
78                 "--date-order",
79                 "--unpacked",
80                 NULL
81         };
82         const char **p = rev_args;
83
84         /* accept -<digit>, like traditional "head" */
85         if ((*arg == '-') && isdigit(arg[1]))
86                 return 1;
87
88         for (;;) {
89                 const char *str = *p++;
90                 int len;
91                 if (!str)
92                         return 0;
93                 len = strlen(str);
94                 if (!strcmp(arg, str) ||
95                     (str[len-1] == '=' && !strncmp(arg, str, len)))
96                         return 1;
97         }
98 }
99
100 /* Output argument as a string, either SQ or normal */
101 static void show(const char *arg)
102 {
103         if (output_sq) {
104                 int sq = '\'', ch;
105
106                 putchar(sq);
107                 while ((ch = *arg++)) {
108                         if (ch == sq)
109                                 fputs("'\\'", stdout);
110                         putchar(ch);
111                 }
112                 putchar(sq);
113                 putchar(' ');
114         }
115         else
116                 puts(arg);
117 }
118
119 /* Like show(), but with a negation prefix according to type */
120 static void show_with_type(int type, const char *arg)
121 {
122         if (type != show_type)
123                 putchar('^');
124         show(arg);
125 }
126
127 /* Output a revision, only if filter allows it */
128 static void show_rev(int type, const struct object_id *oid, const char *name)
129 {
130         if (!(filter & DO_REVS))
131                 return;
132         def = NULL;
133
134         if ((symbolic || abbrev_ref) && name) {
135                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
136                         struct object_id discard;
137                         char *full;
138
139                         switch (dwim_ref(name, strlen(name), &discard, &full)) {
140                         case 0:
141                                 /*
142                                  * Not found -- not a ref.  We could
143                                  * emit "name" here, but symbolic-full
144                                  * users are interested in finding the
145                                  * refs spelled in full, and they would
146                                  * need to filter non-refs if we did so.
147                                  */
148                                 break;
149                         case 1: /* happy */
150                                 if (abbrev_ref)
151                                         full = shorten_unambiguous_ref(full,
152                                                 abbrev_ref_strict);
153                                 show_with_type(type, full);
154                                 break;
155                         default: /* ambiguous */
156                                 error("refname '%s' is ambiguous", name);
157                                 break;
158                         }
159                         free(full);
160                 } else {
161                         show_with_type(type, name);
162                 }
163         }
164         else if (abbrev)
165                 show_with_type(type, find_unique_abbrev(oid, abbrev));
166         else
167                 show_with_type(type, oid_to_hex(oid));
168 }
169
170 /* Output a flag, only if filter allows it. */
171 static int show_flag(const char *arg)
172 {
173         if (!(filter & DO_FLAGS))
174                 return 0;
175         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
176                 show(arg);
177                 return 1;
178         }
179         return 0;
180 }
181
182 static int show_default(void)
183 {
184         const char *s = def;
185
186         if (s) {
187                 struct object_id oid;
188
189                 def = NULL;
190                 if (!get_oid(s, &oid)) {
191                         show_rev(NORMAL, &oid, s);
192                         return 1;
193                 }
194         }
195         return 0;
196 }
197
198 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
199 {
200         if (ref_excluded(ref_excludes, refname))
201                 return 0;
202         show_rev(NORMAL, oid, refname);
203         return 0;
204 }
205
206 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
207 {
208         show_rev(REVERSED, oid, refname);
209         return 0;
210 }
211
212 static int show_abbrev(const struct object_id *oid, void *cb_data)
213 {
214         show_rev(NORMAL, oid, NULL);
215         return 0;
216 }
217
218 static void show_datestring(const char *flag, const char *datestr)
219 {
220         char *buffer;
221
222         /* date handling requires both flags and revs */
223         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
224                 return;
225         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
226         show(buffer);
227         free(buffer);
228 }
229
230 static int show_file(const char *arg, int output_prefix)
231 {
232         show_default();
233         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
234                 if (output_prefix) {
235                         const char *prefix = startup_info->prefix;
236                         char *fname = prefix_filename(prefix, arg);
237                         show(fname);
238                         free(fname);
239                 } else
240                         show(arg);
241                 return 1;
242         }
243         return 0;
244 }
245
246 static int try_difference(const char *arg)
247 {
248         char *dotdot;
249         struct object_id start_oid;
250         struct object_id end_oid;
251         const char *end;
252         const char *start;
253         int symmetric;
254         static const char head_by_default[] = "HEAD";
255
256         if (!(dotdot = strstr(arg, "..")))
257                 return 0;
258         end = dotdot + 2;
259         start = arg;
260         symmetric = (*end == '.');
261
262         *dotdot = 0;
263         end += symmetric;
264
265         if (!*end)
266                 end = head_by_default;
267         if (dotdot == arg)
268                 start = head_by_default;
269
270         if (start == head_by_default && end == head_by_default &&
271             !symmetric) {
272                 /*
273                  * Just ".."?  That is not a range but the
274                  * pathspec for the parent directory.
275                  */
276                 *dotdot = '.';
277                 return 0;
278         }
279
280         if (!get_oid_committish(start, &start_oid) && !get_oid_committish(end, &end_oid)) {
281                 show_rev(NORMAL, &end_oid, end);
282                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
283                 if (symmetric) {
284                         struct commit_list *exclude;
285                         struct commit *a, *b;
286                         a = lookup_commit_reference(the_repository, &start_oid);
287                         b = lookup_commit_reference(the_repository, &end_oid);
288                         if (!a || !b) {
289                                 *dotdot = '.';
290                                 return 0;
291                         }
292                         exclude = get_merge_bases(a, b);
293                         while (exclude) {
294                                 struct commit *commit = pop_commit(&exclude);
295                                 show_rev(REVERSED, &commit->object.oid, NULL);
296                         }
297                 }
298                 *dotdot = '.';
299                 return 1;
300         }
301         *dotdot = '.';
302         return 0;
303 }
304
305 static int try_parent_shorthands(const char *arg)
306 {
307         char *dotdot;
308         struct object_id oid;
309         struct commit *commit;
310         struct commit_list *parents;
311         int parent_number;
312         int include_rev = 0;
313         int include_parents = 0;
314         int exclude_parent = 0;
315
316         if ((dotdot = strstr(arg, "^!"))) {
317                 include_rev = 1;
318                 if (dotdot[2])
319                         return 0;
320         } else if ((dotdot = strstr(arg, "^@"))) {
321                 include_parents = 1;
322                 if (dotdot[2])
323                         return 0;
324         } else if ((dotdot = strstr(arg, "^-"))) {
325                 include_rev = 1;
326                 exclude_parent = 1;
327
328                 if (dotdot[2]) {
329                         char *end;
330                         exclude_parent = strtoul(dotdot + 2, &end, 10);
331                         if (*end != '\0' || !exclude_parent)
332                                 return 0;
333                 }
334         } else
335                 return 0;
336
337         *dotdot = 0;
338         if (get_oid_committish(arg, &oid) ||
339             !(commit = lookup_commit_reference(the_repository, &oid))) {
340                 *dotdot = '^';
341                 return 0;
342         }
343
344         if (exclude_parent &&
345             exclude_parent > commit_list_count(commit->parents)) {
346                 *dotdot = '^';
347                 return 0;
348         }
349
350         if (include_rev)
351                 show_rev(NORMAL, &oid, arg);
352         for (parents = commit->parents, parent_number = 1;
353              parents;
354              parents = parents->next, parent_number++) {
355                 char *name = NULL;
356
357                 if (exclude_parent && parent_number != exclude_parent)
358                         continue;
359
360                 if (symbolic)
361                         name = xstrfmt("%s^%d", arg, parent_number);
362                 show_rev(include_parents ? NORMAL : REVERSED,
363                          &parents->item->object.oid, name);
364                 free(name);
365         }
366
367         *dotdot = '^';
368         return 1;
369 }
370
371 static int parseopt_dump(const struct option *o, const char *arg, int unset)
372 {
373         struct strbuf *parsed = o->value;
374         if (unset)
375                 strbuf_addf(parsed, " --no-%s", o->long_name);
376         else if (o->short_name && (o->long_name == NULL || !stuck_long))
377                 strbuf_addf(parsed, " -%c", o->short_name);
378         else
379                 strbuf_addf(parsed, " --%s", o->long_name);
380         if (arg) {
381                 if (!stuck_long)
382                         strbuf_addch(parsed, ' ');
383                 else if (o->long_name)
384                         strbuf_addch(parsed, '=');
385                 sq_quote_buf(parsed, arg);
386         }
387         return 0;
388 }
389
390 static const char *skipspaces(const char *s)
391 {
392         while (isspace(*s))
393                 s++;
394         return s;
395 }
396
397 static char *findspace(const char *s)
398 {
399         for (; *s; s++)
400                 if (isspace(*s))
401                         return (char*)s;
402         return NULL;
403 }
404
405 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
406 {
407         static int keep_dashdash = 0, stop_at_non_option = 0;
408         static char const * const parseopt_usage[] = {
409                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
410                 NULL
411         };
412         static struct option parseopt_opts[] = {
413                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
414                                         N_("keep the `--` passed as an arg")),
415                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
416                                         N_("stop parsing after the "
417                                            "first non-option argument")),
418                 OPT_BOOL(0, "stuck-long", &stuck_long,
419                                         N_("output in stuck long form")),
420                 OPT_END(),
421         };
422         static const char * const flag_chars = "*=?!";
423
424         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
425         const char **usage = NULL;
426         struct option *opts = NULL;
427         int onb = 0, osz = 0, unb = 0, usz = 0;
428
429         strbuf_addstr(&parsed, "set --");
430         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
431                              PARSE_OPT_KEEP_DASHDASH);
432         if (argc < 1 || strcmp(argv[0], "--"))
433                 usage_with_options(parseopt_usage, parseopt_opts);
434
435         /* get the usage up to the first line with a -- on it */
436         for (;;) {
437                 if (strbuf_getline(&sb, stdin) == EOF)
438                         die("premature end of input");
439                 ALLOC_GROW(usage, unb + 1, usz);
440                 if (!strcmp("--", sb.buf)) {
441                         if (unb < 1)
442                                 die("no usage string given before the `--' separator");
443                         usage[unb] = NULL;
444                         break;
445                 }
446                 usage[unb++] = strbuf_detach(&sb, NULL);
447         }
448
449         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
450         while (strbuf_getline(&sb, stdin) != EOF) {
451                 const char *s;
452                 char *help;
453                 struct option *o;
454
455                 if (!sb.len)
456                         continue;
457
458                 ALLOC_GROW(opts, onb + 1, osz);
459                 memset(opts + onb, 0, sizeof(opts[onb]));
460
461                 o = &opts[onb++];
462                 help = findspace(sb.buf);
463                 if (!help || sb.buf == help) {
464                         o->type = OPTION_GROUP;
465                         o->help = xstrdup(skipspaces(sb.buf));
466                         continue;
467                 }
468
469                 *help = '\0';
470
471                 o->type = OPTION_CALLBACK;
472                 o->help = xstrdup(skipspaces(help+1));
473                 o->value = &parsed;
474                 o->flags = PARSE_OPT_NOARG;
475                 o->callback = &parseopt_dump;
476
477                 /* name(s) */
478                 s = strpbrk(sb.buf, flag_chars);
479                 if (s == NULL)
480                         s = help;
481
482                 if (s - sb.buf == 1) /* short option only */
483                         o->short_name = *sb.buf;
484                 else if (sb.buf[1] != ',') /* long option only */
485                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
486                 else {
487                         o->short_name = *sb.buf;
488                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
489                 }
490
491                 /* flags */
492                 while (s < help) {
493                         switch (*s++) {
494                         case '=':
495                                 o->flags &= ~PARSE_OPT_NOARG;
496                                 continue;
497                         case '?':
498                                 o->flags &= ~PARSE_OPT_NOARG;
499                                 o->flags |= PARSE_OPT_OPTARG;
500                                 continue;
501                         case '!':
502                                 o->flags |= PARSE_OPT_NONEG;
503                                 continue;
504                         case '*':
505                                 o->flags |= PARSE_OPT_HIDDEN;
506                                 continue;
507                         }
508                         s--;
509                         break;
510                 }
511
512                 if (s < help)
513                         o->argh = xmemdupz(s, help - s);
514         }
515         strbuf_release(&sb);
516
517         /* put an OPT_END() */
518         ALLOC_GROW(opts, onb + 1, osz);
519         memset(opts + onb, 0, sizeof(opts[onb]));
520         argc = parse_options(argc, argv, prefix, opts, usage,
521                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
522                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
523                         PARSE_OPT_SHELL_EVAL);
524
525         strbuf_addstr(&parsed, " --");
526         sq_quote_argv(&parsed, argv);
527         puts(parsed.buf);
528         return 0;
529 }
530
531 static int cmd_sq_quote(int argc, const char **argv)
532 {
533         struct strbuf buf = STRBUF_INIT;
534
535         if (argc)
536                 sq_quote_argv(&buf, argv);
537         printf("%s\n", buf.buf);
538         strbuf_release(&buf);
539
540         return 0;
541 }
542
543 static void die_no_single_rev(int quiet)
544 {
545         if (quiet)
546                 exit(1);
547         else
548                 die("Needed a single revision");
549 }
550
551 static const char builtin_rev_parse_usage[] =
552 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
553    "   or: git rev-parse --sq-quote [<arg>...]\n"
554    "   or: git rev-parse [<options>] [<arg>...]\n"
555    "\n"
556    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
557
558 /*
559  * Parse "opt" or "opt=<value>", setting value respectively to either
560  * NULL or the string after "=".
561  */
562 static int opt_with_value(const char *arg, const char *opt, const char **value)
563 {
564         if (skip_prefix(arg, opt, &arg)) {
565                 if (!*arg) {
566                         *value = NULL;
567                         return 1;
568                 }
569                 if (*arg++ == '=') {
570                         *value = arg;
571                         return 1;
572                 }
573         }
574         return 0;
575 }
576
577 static void handle_ref_opt(const char *pattern, const char *prefix)
578 {
579         if (pattern)
580                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
581         else
582                 for_each_ref_in(prefix, show_reference, NULL);
583         clear_ref_exclusion(&ref_excludes);
584 }
585
586 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
587 {
588         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
589         int did_repo_setup = 0;
590         int has_dashdash = 0;
591         int output_prefix = 0;
592         struct object_id oid;
593         unsigned int flags = 0;
594         const char *name = NULL;
595         struct object_context unused;
596         struct strbuf buf = STRBUF_INIT;
597         const int hexsz = the_hash_algo->hexsz;
598
599         if (argc > 1 && !strcmp("--parseopt", argv[1]))
600                 return cmd_parseopt(argc - 1, argv + 1, prefix);
601
602         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
603                 return cmd_sq_quote(argc - 2, argv + 2);
604
605         if (argc > 1 && !strcmp("-h", argv[1]))
606                 usage(builtin_rev_parse_usage);
607
608         for (i = 1; i < argc; i++) {
609                 if (!strcmp(argv[i], "--")) {
610                         has_dashdash = 1;
611                         break;
612                 }
613         }
614
615         /* No options; just report on whether we're in a git repo or not. */
616         if (argc == 1) {
617                 setup_git_directory();
618                 git_config(git_default_config, NULL);
619                 return 0;
620         }
621
622         for (i = 1; i < argc; i++) {
623                 const char *arg = argv[i];
624
625                 if (!strcmp(arg, "--local-env-vars")) {
626                         int i;
627                         for (i = 0; local_repo_env[i]; i++)
628                                 printf("%s\n", local_repo_env[i]);
629                         continue;
630                 }
631                 if (!strcmp(arg, "--resolve-git-dir")) {
632                         const char *gitdir = argv[++i];
633                         if (!gitdir)
634                                 die("--resolve-git-dir requires an argument");
635                         gitdir = resolve_gitdir(gitdir);
636                         if (!gitdir)
637                                 die("not a gitdir '%s'", argv[i]);
638                         puts(gitdir);
639                         continue;
640                 }
641
642                 /* The rest of the options require a git repository. */
643                 if (!did_repo_setup) {
644                         prefix = setup_git_directory();
645                         git_config(git_default_config, NULL);
646                         did_repo_setup = 1;
647                 }
648
649                 if (!strcmp(arg, "--git-path")) {
650                         if (!argv[i + 1])
651                                 die("--git-path requires an argument");
652                         strbuf_reset(&buf);
653                         puts(relative_path(git_path("%s", argv[i + 1]),
654                                            prefix, &buf));
655                         i++;
656                         continue;
657                 }
658                 if (as_is) {
659                         if (show_file(arg, output_prefix) && as_is < 2)
660                                 verify_filename(prefix, arg, 0);
661                         continue;
662                 }
663                 if (!strcmp(arg,"-n")) {
664                         if (++i >= argc)
665                                 die("-n requires an argument");
666                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
667                                 show(arg);
668                                 show(argv[i]);
669                         }
670                         continue;
671                 }
672                 if (starts_with(arg, "-n")) {
673                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
674                                 show(arg);
675                         continue;
676                 }
677
678                 if (*arg == '-') {
679                         if (!strcmp(arg, "--")) {
680                                 as_is = 2;
681                                 /* Pass on the "--" if we show anything but files.. */
682                                 if (filter & (DO_FLAGS | DO_REVS))
683                                         show_file(arg, 0);
684                                 continue;
685                         }
686                         if (!strcmp(arg, "--default")) {
687                                 def = argv[++i];
688                                 if (!def)
689                                         die("--default requires an argument");
690                                 continue;
691                         }
692                         if (!strcmp(arg, "--prefix")) {
693                                 prefix = argv[++i];
694                                 if (!prefix)
695                                         die("--prefix requires an argument");
696                                 startup_info->prefix = prefix;
697                                 output_prefix = 1;
698                                 continue;
699                         }
700                         if (!strcmp(arg, "--revs-only")) {
701                                 filter &= ~DO_NOREV;
702                                 continue;
703                         }
704                         if (!strcmp(arg, "--no-revs")) {
705                                 filter &= ~DO_REVS;
706                                 continue;
707                         }
708                         if (!strcmp(arg, "--flags")) {
709                                 filter &= ~DO_NONFLAGS;
710                                 continue;
711                         }
712                         if (!strcmp(arg, "--no-flags")) {
713                                 filter &= ~DO_FLAGS;
714                                 continue;
715                         }
716                         if (!strcmp(arg, "--verify")) {
717                                 filter &= ~(DO_FLAGS|DO_NOREV);
718                                 verify = 1;
719                                 continue;
720                         }
721                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
722                                 quiet = 1;
723                                 flags |= GET_OID_QUIETLY;
724                                 continue;
725                         }
726                         if (opt_with_value(arg, "--short", &arg)) {
727                                 filter &= ~(DO_FLAGS|DO_NOREV);
728                                 verify = 1;
729                                 abbrev = DEFAULT_ABBREV;
730                                 if (!arg)
731                                         continue;
732                                 abbrev = strtoul(arg, NULL, 10);
733                                 if (abbrev < MINIMUM_ABBREV)
734                                         abbrev = MINIMUM_ABBREV;
735                                 else if (hexsz <= abbrev)
736                                         abbrev = hexsz;
737                                 continue;
738                         }
739                         if (!strcmp(arg, "--sq")) {
740                                 output_sq = 1;
741                                 continue;
742                         }
743                         if (!strcmp(arg, "--not")) {
744                                 show_type ^= REVERSED;
745                                 continue;
746                         }
747                         if (!strcmp(arg, "--symbolic")) {
748                                 symbolic = SHOW_SYMBOLIC_ASIS;
749                                 continue;
750                         }
751                         if (!strcmp(arg, "--symbolic-full-name")) {
752                                 symbolic = SHOW_SYMBOLIC_FULL;
753                                 continue;
754                         }
755                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
756                                 abbrev_ref = 1;
757                                 abbrev_ref_strict = warn_ambiguous_refs;
758                                 if (arg) {
759                                         if (!strcmp(arg, "strict"))
760                                                 abbrev_ref_strict = 1;
761                                         else if (!strcmp(arg, "loose"))
762                                                 abbrev_ref_strict = 0;
763                                         else
764                                                 die("unknown mode for --abbrev-ref: %s",
765                                                     arg);
766                                 }
767                                 continue;
768                         }
769                         if (!strcmp(arg, "--all")) {
770                                 for_each_ref(show_reference, NULL);
771                                 clear_ref_exclusion(&ref_excludes);
772                                 continue;
773                         }
774                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
775                                 for_each_abbrev(arg, show_abbrev, NULL);
776                                 continue;
777                         }
778                         if (!strcmp(arg, "--bisect")) {
779                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
780                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
781                                 continue;
782                         }
783                         if (opt_with_value(arg, "--branches", &arg)) {
784                                 handle_ref_opt(arg, "refs/heads/");
785                                 continue;
786                         }
787                         if (opt_with_value(arg, "--tags", &arg)) {
788                                 handle_ref_opt(arg, "refs/tags/");
789                                 continue;
790                         }
791                         if (skip_prefix(arg, "--glob=", &arg)) {
792                                 handle_ref_opt(arg, NULL);
793                                 continue;
794                         }
795                         if (opt_with_value(arg, "--remotes", &arg)) {
796                                 handle_ref_opt(arg, "refs/remotes/");
797                                 continue;
798                         }
799                         if (skip_prefix(arg, "--exclude=", &arg)) {
800                                 add_ref_exclusion(&ref_excludes, arg);
801                                 continue;
802                         }
803                         if (!strcmp(arg, "--show-toplevel")) {
804                                 const char *work_tree = get_git_work_tree();
805                                 if (work_tree)
806                                         puts(work_tree);
807                                 else
808                                         die("this operation must be run in a work tree");
809                                 continue;
810                         }
811                         if (!strcmp(arg, "--show-superproject-working-tree")) {
812                                 struct strbuf superproject = STRBUF_INIT;
813                                 if (get_superproject_working_tree(&superproject))
814                                         puts(superproject.buf);
815                                 strbuf_release(&superproject);
816                                 continue;
817                         }
818                         if (!strcmp(arg, "--show-prefix")) {
819                                 if (prefix)
820                                         puts(prefix);
821                                 else
822                                         putchar('\n');
823                                 continue;
824                         }
825                         if (!strcmp(arg, "--show-cdup")) {
826                                 const char *pfx = prefix;
827                                 if (!is_inside_work_tree()) {
828                                         const char *work_tree =
829                                                 get_git_work_tree();
830                                         if (work_tree)
831                                                 printf("%s\n", work_tree);
832                                         continue;
833                                 }
834                                 while (pfx) {
835                                         pfx = strchr(pfx, '/');
836                                         if (pfx) {
837                                                 pfx++;
838                                                 printf("../");
839                                         }
840                                 }
841                                 putchar('\n');
842                                 continue;
843                         }
844                         if (!strcmp(arg, "--git-dir") ||
845                             !strcmp(arg, "--absolute-git-dir")) {
846                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
847                                 char *cwd;
848                                 int len;
849                                 if (arg[2] == 'g') {    /* --git-dir */
850                                         if (gitdir) {
851                                                 puts(gitdir);
852                                                 continue;
853                                         }
854                                         if (!prefix) {
855                                                 puts(".git");
856                                                 continue;
857                                         }
858                                 } else {                /* --absolute-git-dir */
859                                         if (!gitdir && !prefix)
860                                                 gitdir = ".git";
861                                         if (gitdir) {
862                                                 struct strbuf realpath = STRBUF_INIT;
863                                                 strbuf_realpath(&realpath, gitdir, 1);
864                                                 puts(realpath.buf);
865                                                 strbuf_release(&realpath);
866                                                 continue;
867                                         }
868                                 }
869                                 cwd = xgetcwd();
870                                 len = strlen(cwd);
871                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
872                                 free(cwd);
873                                 continue;
874                         }
875                         if (!strcmp(arg, "--git-common-dir")) {
876                                 strbuf_reset(&buf);
877                                 puts(relative_path(get_git_common_dir(),
878                                                    prefix, &buf));
879                                 continue;
880                         }
881                         if (!strcmp(arg, "--is-inside-git-dir")) {
882                                 printf("%s\n", is_inside_git_dir() ? "true"
883                                                 : "false");
884                                 continue;
885                         }
886                         if (!strcmp(arg, "--is-inside-work-tree")) {
887                                 printf("%s\n", is_inside_work_tree() ? "true"
888                                                 : "false");
889                                 continue;
890                         }
891                         if (!strcmp(arg, "--is-bare-repository")) {
892                                 printf("%s\n", is_bare_repository() ? "true"
893                                                 : "false");
894                                 continue;
895                         }
896                         if (!strcmp(arg, "--is-shallow-repository")) {
897                                 printf("%s\n",
898                                                 is_repository_shallow(the_repository) ? "true"
899                                                 : "false");
900                                 continue;
901                         }
902                         if (!strcmp(arg, "--shared-index-path")) {
903                                 if (read_cache() < 0)
904                                         die(_("Could not read the index"));
905                                 if (the_index.split_index) {
906                                         const struct object_id *oid = &the_index.split_index->base_oid;
907                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
908                                         strbuf_reset(&buf);
909                                         puts(relative_path(path, prefix, &buf));
910                                 }
911                                 continue;
912                         }
913                         if (skip_prefix(arg, "--since=", &arg)) {
914                                 show_datestring("--max-age=", arg);
915                                 continue;
916                         }
917                         if (skip_prefix(arg, "--after=", &arg)) {
918                                 show_datestring("--max-age=", arg);
919                                 continue;
920                         }
921                         if (skip_prefix(arg, "--before=", &arg)) {
922                                 show_datestring("--min-age=", arg);
923                                 continue;
924                         }
925                         if (skip_prefix(arg, "--until=", &arg)) {
926                                 show_datestring("--min-age=", arg);
927                                 continue;
928                         }
929                         if (opt_with_value(arg, "--show-object-format", &arg)) {
930                                 const char *val = arg ? arg : "storage";
931
932                                 if (strcmp(val, "storage") &&
933                                     strcmp(val, "input") &&
934                                     strcmp(val, "output"))
935                                         die("unknown mode for --show-object-format: %s",
936                                             arg);
937                                 puts(the_hash_algo->name);
938                                 continue;
939                         }
940                         if (show_flag(arg) && verify)
941                                 die_no_single_rev(quiet);
942                         continue;
943                 }
944
945                 /* Not a flag argument */
946                 if (try_difference(arg))
947                         continue;
948                 if (try_parent_shorthands(arg))
949                         continue;
950                 name = arg;
951                 type = NORMAL;
952                 if (*arg == '^') {
953                         name++;
954                         type = REVERSED;
955                 }
956                 if (!get_oid_with_context(the_repository, name,
957                                           flags, &oid, &unused)) {
958                         if (verify)
959                                 revs_count++;
960                         else
961                                 show_rev(type, &oid, name);
962                         continue;
963                 }
964                 if (verify)
965                         die_no_single_rev(quiet);
966                 if (has_dashdash)
967                         die("bad revision '%s'", arg);
968                 as_is = 1;
969                 if (!show_file(arg, output_prefix))
970                         continue;
971                 verify_filename(prefix, arg, 1);
972         }
973         strbuf_release(&buf);
974         if (verify) {
975                 if (revs_count == 1) {
976                         show_rev(type, &oid, name);
977                         return 0;
978                 } else if (revs_count == 0 && show_default())
979                         return 0;
980                 die_no_single_rev(quiet);
981         } else
982                 show_default();
983         return 0;
984 }