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