Merge branch 'ug/doc-lose-dircache'
[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, 0)) {
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 enum format_type {
587         /* We would like a relative path. */
588         FORMAT_RELATIVE,
589         /* We would like a canonical absolute path. */
590         FORMAT_CANONICAL,
591         /* We would like the default behavior. */
592         FORMAT_DEFAULT,
593 };
594
595 enum default_type {
596         /* Our default is a relative path. */
597         DEFAULT_RELATIVE,
598         /* Our default is a relative path if there's a shared root. */
599         DEFAULT_RELATIVE_IF_SHARED,
600         /* Our default is a canonical absolute path. */
601         DEFAULT_CANONICAL,
602         /* Our default is not to modify the item. */
603         DEFAULT_UNMODIFIED,
604 };
605
606 static void print_path(const char *path, const char *prefix, enum format_type format, enum default_type def)
607 {
608         char *cwd = NULL;
609         /*
610          * We don't ever produce a relative path if prefix is NULL, so set the
611          * prefix to the current directory so that we can produce a relative
612          * path whenever possible.  If we're using RELATIVE_IF_SHARED mode, then
613          * we want an absolute path unless the two share a common prefix, so don't
614          * set it in that case, since doing so causes a relative path to always
615          * be produced if possible.
616          */
617         if (!prefix && (format != FORMAT_DEFAULT || def != DEFAULT_RELATIVE_IF_SHARED))
618                 prefix = cwd = xgetcwd();
619         if (format == FORMAT_DEFAULT && def == DEFAULT_UNMODIFIED) {
620                 puts(path);
621         } else if (format == FORMAT_RELATIVE ||
622                   (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE)) {
623                 /*
624                  * In order for relative_path to work as expected, we need to
625                  * make sure that both paths are absolute paths.  If we don't,
626                  * we can end up with an unexpected absolute path that the user
627                  * didn't want.
628                  */
629                 struct strbuf buf = STRBUF_INIT, realbuf = STRBUF_INIT, prefixbuf = STRBUF_INIT;
630                 if (!is_absolute_path(path)) {
631                         strbuf_realpath_forgiving(&realbuf, path,  1);
632                         path = realbuf.buf;
633                 }
634                 if (!is_absolute_path(prefix)) {
635                         strbuf_realpath_forgiving(&prefixbuf, prefix, 1);
636                         prefix = prefixbuf.buf;
637                 }
638                 puts(relative_path(path, prefix, &buf));
639                 strbuf_release(&buf);
640                 strbuf_release(&realbuf);
641                 strbuf_release(&prefixbuf);
642         } else if (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE_IF_SHARED) {
643                 struct strbuf buf = STRBUF_INIT;
644                 puts(relative_path(path, prefix, &buf));
645                 strbuf_release(&buf);
646         } else {
647                 struct strbuf buf = STRBUF_INIT;
648                 strbuf_realpath_forgiving(&buf, path, 1);
649                 puts(buf.buf);
650                 strbuf_release(&buf);
651         }
652         free(cwd);
653 }
654
655 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
656 {
657         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
658         int did_repo_setup = 0;
659         int has_dashdash = 0;
660         int output_prefix = 0;
661         struct object_id oid;
662         unsigned int flags = 0;
663         const char *name = NULL;
664         struct object_context unused;
665         struct strbuf buf = STRBUF_INIT;
666         const int hexsz = the_hash_algo->hexsz;
667         int seen_end_of_options = 0;
668         enum format_type format = FORMAT_DEFAULT;
669
670         if (argc > 1 && !strcmp("--parseopt", argv[1]))
671                 return cmd_parseopt(argc - 1, argv + 1, prefix);
672
673         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
674                 return cmd_sq_quote(argc - 2, argv + 2);
675
676         if (argc > 1 && !strcmp("-h", argv[1]))
677                 usage(builtin_rev_parse_usage);
678
679         for (i = 1; i < argc; i++) {
680                 if (!strcmp(argv[i], "--")) {
681                         has_dashdash = 1;
682                         break;
683                 }
684         }
685
686         /* No options; just report on whether we're in a git repo or not. */
687         if (argc == 1) {
688                 setup_git_directory();
689                 git_config(git_default_config, NULL);
690                 return 0;
691         }
692
693         for (i = 1; i < argc; i++) {
694                 const char *arg = argv[i];
695
696                 if (as_is) {
697                         if (show_file(arg, output_prefix) && as_is < 2)
698                                 verify_filename(prefix, arg, 0);
699                         continue;
700                 }
701
702                 if (!seen_end_of_options) {
703                         if (!strcmp(arg, "--local-env-vars")) {
704                                 int i;
705                                 for (i = 0; local_repo_env[i]; i++)
706                                         printf("%s\n", local_repo_env[i]);
707                                 continue;
708                         }
709                         if (!strcmp(arg, "--resolve-git-dir")) {
710                                 const char *gitdir = argv[++i];
711                                 if (!gitdir)
712                                         die("--resolve-git-dir requires an argument");
713                                 gitdir = resolve_gitdir(gitdir);
714                                 if (!gitdir)
715                                         die("not a gitdir '%s'", argv[i]);
716                                 puts(gitdir);
717                                 continue;
718                         }
719                 }
720
721                 /* The rest of the options require a git repository. */
722                 if (!did_repo_setup) {
723                         prefix = setup_git_directory();
724                         git_config(git_default_config, NULL);
725                         did_repo_setup = 1;
726                 }
727
728                 if (!strcmp(arg, "--")) {
729                         as_is = 2;
730                         /* Pass on the "--" if we show anything but files.. */
731                         if (filter & (DO_FLAGS | DO_REVS))
732                                 show_file(arg, 0);
733                         continue;
734                 }
735
736                 if (!seen_end_of_options && *arg == '-') {
737                         if (!strcmp(arg, "--git-path")) {
738                                 if (!argv[i + 1])
739                                         die("--git-path requires an argument");
740                                 strbuf_reset(&buf);
741                                 print_path(git_path("%s", argv[i + 1]), prefix,
742                                                 format,
743                                                 DEFAULT_RELATIVE_IF_SHARED);
744                                 i++;
745                                 continue;
746                         }
747                         if (!strcmp(arg,"-n")) {
748                                 if (++i >= argc)
749                                         die("-n requires an argument");
750                                 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
751                                         show(arg);
752                                         show(argv[i]);
753                                 }
754                                 continue;
755                         }
756                         if (starts_with(arg, "-n")) {
757                                 if ((filter & DO_FLAGS) && (filter & DO_REVS))
758                                         show(arg);
759                                 continue;
760                         }
761                         if (opt_with_value(arg, "--path-format", &arg)) {
762                                 if (!strcmp(arg, "absolute")) {
763                                         format = FORMAT_CANONICAL;
764                                 } else if (!strcmp(arg, "relative")) {
765                                         format = FORMAT_RELATIVE;
766                                 } else {
767                                         die("unknown argument to --path-format: %s", arg);
768                                 }
769                                 continue;
770                         }
771                         if (!strcmp(arg, "--default")) {
772                                 def = argv[++i];
773                                 if (!def)
774                                         die("--default requires an argument");
775                                 continue;
776                         }
777                         if (!strcmp(arg, "--prefix")) {
778                                 prefix = argv[++i];
779                                 if (!prefix)
780                                         die("--prefix requires an argument");
781                                 startup_info->prefix = prefix;
782                                 output_prefix = 1;
783                                 continue;
784                         }
785                         if (!strcmp(arg, "--revs-only")) {
786                                 filter &= ~DO_NOREV;
787                                 continue;
788                         }
789                         if (!strcmp(arg, "--no-revs")) {
790                                 filter &= ~DO_REVS;
791                                 continue;
792                         }
793                         if (!strcmp(arg, "--flags")) {
794                                 filter &= ~DO_NONFLAGS;
795                                 continue;
796                         }
797                         if (!strcmp(arg, "--no-flags")) {
798                                 filter &= ~DO_FLAGS;
799                                 continue;
800                         }
801                         if (!strcmp(arg, "--verify")) {
802                                 filter &= ~(DO_FLAGS|DO_NOREV);
803                                 verify = 1;
804                                 continue;
805                         }
806                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
807                                 quiet = 1;
808                                 flags |= GET_OID_QUIETLY;
809                                 continue;
810                         }
811                         if (opt_with_value(arg, "--short", &arg)) {
812                                 filter &= ~(DO_FLAGS|DO_NOREV);
813                                 verify = 1;
814                                 abbrev = DEFAULT_ABBREV;
815                                 if (!arg)
816                                         continue;
817                                 abbrev = strtoul(arg, NULL, 10);
818                                 if (abbrev < MINIMUM_ABBREV)
819                                         abbrev = MINIMUM_ABBREV;
820                                 else if (hexsz <= abbrev)
821                                         abbrev = hexsz;
822                                 continue;
823                         }
824                         if (!strcmp(arg, "--sq")) {
825                                 output_sq = 1;
826                                 continue;
827                         }
828                         if (!strcmp(arg, "--not")) {
829                                 show_type ^= REVERSED;
830                                 continue;
831                         }
832                         if (!strcmp(arg, "--symbolic")) {
833                                 symbolic = SHOW_SYMBOLIC_ASIS;
834                                 continue;
835                         }
836                         if (!strcmp(arg, "--symbolic-full-name")) {
837                                 symbolic = SHOW_SYMBOLIC_FULL;
838                                 continue;
839                         }
840                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
841                                 abbrev_ref = 1;
842                                 abbrev_ref_strict = warn_ambiguous_refs;
843                                 if (arg) {
844                                         if (!strcmp(arg, "strict"))
845                                                 abbrev_ref_strict = 1;
846                                         else if (!strcmp(arg, "loose"))
847                                                 abbrev_ref_strict = 0;
848                                         else
849                                                 die("unknown mode for --abbrev-ref: %s",
850                                                     arg);
851                                 }
852                                 continue;
853                         }
854                         if (!strcmp(arg, "--all")) {
855                                 for_each_ref(show_reference, NULL);
856                                 clear_ref_exclusion(&ref_excludes);
857                                 continue;
858                         }
859                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
860                                 for_each_abbrev(arg, show_abbrev, NULL);
861                                 continue;
862                         }
863                         if (!strcmp(arg, "--bisect")) {
864                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
865                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
866                                 continue;
867                         }
868                         if (opt_with_value(arg, "--branches", &arg)) {
869                                 handle_ref_opt(arg, "refs/heads/");
870                                 continue;
871                         }
872                         if (opt_with_value(arg, "--tags", &arg)) {
873                                 handle_ref_opt(arg, "refs/tags/");
874                                 continue;
875                         }
876                         if (skip_prefix(arg, "--glob=", &arg)) {
877                                 handle_ref_opt(arg, NULL);
878                                 continue;
879                         }
880                         if (opt_with_value(arg, "--remotes", &arg)) {
881                                 handle_ref_opt(arg, "refs/remotes/");
882                                 continue;
883                         }
884                         if (skip_prefix(arg, "--exclude=", &arg)) {
885                                 add_ref_exclusion(&ref_excludes, arg);
886                                 continue;
887                         }
888                         if (!strcmp(arg, "--show-toplevel")) {
889                                 const char *work_tree = get_git_work_tree();
890                                 if (work_tree)
891                                         print_path(work_tree, prefix, format, DEFAULT_UNMODIFIED);
892                                 else
893                                         die("this operation must be run in a work tree");
894                                 continue;
895                         }
896                         if (!strcmp(arg, "--show-superproject-working-tree")) {
897                                 struct strbuf superproject = STRBUF_INIT;
898                                 if (get_superproject_working_tree(&superproject))
899                                         print_path(superproject.buf, prefix, format, DEFAULT_UNMODIFIED);
900                                 strbuf_release(&superproject);
901                                 continue;
902                         }
903                         if (!strcmp(arg, "--show-prefix")) {
904                                 if (prefix)
905                                         puts(prefix);
906                                 else
907                                         putchar('\n');
908                                 continue;
909                         }
910                         if (!strcmp(arg, "--show-cdup")) {
911                                 const char *pfx = prefix;
912                                 if (!is_inside_work_tree()) {
913                                         const char *work_tree =
914                                                 get_git_work_tree();
915                                         if (work_tree)
916                                                 printf("%s\n", work_tree);
917                                         continue;
918                                 }
919                                 while (pfx) {
920                                         pfx = strchr(pfx, '/');
921                                         if (pfx) {
922                                                 pfx++;
923                                                 printf("../");
924                                         }
925                                 }
926                                 putchar('\n');
927                                 continue;
928                         }
929                         if (!strcmp(arg, "--git-dir") ||
930                             !strcmp(arg, "--absolute-git-dir")) {
931                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
932                                 char *cwd;
933                                 int len;
934                                 enum format_type wanted = format;
935                                 if (arg[2] == 'g') {    /* --git-dir */
936                                         if (gitdir) {
937                                                 print_path(gitdir, prefix, format, DEFAULT_UNMODIFIED);
938                                                 continue;
939                                         }
940                                         if (!prefix) {
941                                                 print_path(".git", prefix, format, DEFAULT_UNMODIFIED);
942                                                 continue;
943                                         }
944                                 } else {                /* --absolute-git-dir */
945                                         wanted = FORMAT_CANONICAL;
946                                         if (!gitdir && !prefix)
947                                                 gitdir = ".git";
948                                         if (gitdir) {
949                                                 struct strbuf realpath = STRBUF_INIT;
950                                                 strbuf_realpath(&realpath, gitdir, 1);
951                                                 puts(realpath.buf);
952                                                 strbuf_release(&realpath);
953                                                 continue;
954                                         }
955                                 }
956                                 cwd = xgetcwd();
957                                 len = strlen(cwd);
958                                 strbuf_reset(&buf);
959                                 strbuf_addf(&buf, "%s%s.git", cwd, len && cwd[len-1] != '/' ? "/" : "");
960                                 free(cwd);
961                                 print_path(buf.buf, prefix, wanted, DEFAULT_CANONICAL);
962                                 continue;
963                         }
964                         if (!strcmp(arg, "--git-common-dir")) {
965                                 print_path(get_git_common_dir(), prefix, format, DEFAULT_RELATIVE_IF_SHARED);
966                                 continue;
967                         }
968                         if (!strcmp(arg, "--is-inside-git-dir")) {
969                                 printf("%s\n", is_inside_git_dir() ? "true"
970                                                 : "false");
971                                 continue;
972                         }
973                         if (!strcmp(arg, "--is-inside-work-tree")) {
974                                 printf("%s\n", is_inside_work_tree() ? "true"
975                                                 : "false");
976                                 continue;
977                         }
978                         if (!strcmp(arg, "--is-bare-repository")) {
979                                 printf("%s\n", is_bare_repository() ? "true"
980                                                 : "false");
981                                 continue;
982                         }
983                         if (!strcmp(arg, "--is-shallow-repository")) {
984                                 printf("%s\n",
985                                                 is_repository_shallow(the_repository) ? "true"
986                                                 : "false");
987                                 continue;
988                         }
989                         if (!strcmp(arg, "--shared-index-path")) {
990                                 if (read_cache() < 0)
991                                         die(_("Could not read the index"));
992                                 if (the_index.split_index) {
993                                         const struct object_id *oid = &the_index.split_index->base_oid;
994                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
995                                         print_path(path, prefix, format, DEFAULT_RELATIVE);
996                                 }
997                                 continue;
998                         }
999                         if (skip_prefix(arg, "--since=", &arg)) {
1000                                 show_datestring("--max-age=", arg);
1001                                 continue;
1002                         }
1003                         if (skip_prefix(arg, "--after=", &arg)) {
1004                                 show_datestring("--max-age=", arg);
1005                                 continue;
1006                         }
1007                         if (skip_prefix(arg, "--before=", &arg)) {
1008                                 show_datestring("--min-age=", arg);
1009                                 continue;
1010                         }
1011                         if (skip_prefix(arg, "--until=", &arg)) {
1012                                 show_datestring("--min-age=", arg);
1013                                 continue;
1014                         }
1015                         if (opt_with_value(arg, "--show-object-format", &arg)) {
1016                                 const char *val = arg ? arg : "storage";
1017
1018                                 if (strcmp(val, "storage") &&
1019                                     strcmp(val, "input") &&
1020                                     strcmp(val, "output"))
1021                                         die("unknown mode for --show-object-format: %s",
1022                                             arg);
1023                                 puts(the_hash_algo->name);
1024                                 continue;
1025                         }
1026                         if (!strcmp(arg, "--end-of-options")) {
1027                                 seen_end_of_options = 1;
1028                                 if (filter & (DO_FLAGS | DO_REVS))
1029                                         show_file(arg, 0);
1030                                 continue;
1031                         }
1032                         if (show_flag(arg) && verify)
1033                                 die_no_single_rev(quiet);
1034                         continue;
1035                 }
1036
1037                 /* Not a flag argument */
1038                 if (try_difference(arg))
1039                         continue;
1040                 if (try_parent_shorthands(arg))
1041                         continue;
1042                 name = arg;
1043                 type = NORMAL;
1044                 if (*arg == '^') {
1045                         name++;
1046                         type = REVERSED;
1047                 }
1048                 if (!get_oid_with_context(the_repository, name,
1049                                           flags, &oid, &unused)) {
1050                         if (verify)
1051                                 revs_count++;
1052                         else
1053                                 show_rev(type, &oid, name);
1054                         continue;
1055                 }
1056                 if (verify)
1057                         die_no_single_rev(quiet);
1058                 if (has_dashdash)
1059                         die("bad revision '%s'", arg);
1060                 as_is = 1;
1061                 if (!show_file(arg, output_prefix))
1062                         continue;
1063                 verify_filename(prefix, arg, 1);
1064         }
1065         strbuf_release(&buf);
1066         if (verify) {
1067                 if (revs_count == 1) {
1068                         show_rev(type, &oid, name);
1069                         return 0;
1070                 } else if (revs_count == 0 && show_default())
1071                         return 0;
1072                 die_no_single_rev(quiet);
1073         } else
1074                 show_default();
1075         return 0;
1076 }