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 *commit = pop_commit(&exclude);
285 show_rev(REVERSED, commit->object.oid.hash, NULL);
286 }
287 }
288 *dotdot = '.';
289 return 1;
290 }
291 *dotdot = '.';
292 return 0;
293}
294static int try_parent_shorthands(const char *arg)
296{
297 char *dotdot;
298 unsigned char sha1[20];
299 struct commit *commit;
300 struct commit_list *parents;
301 int parents_only;
302 if ((dotdot = strstr(arg, "^!")))
304 parents_only = 0;
305 else if ((dotdot = strstr(arg, "^@")))
306 parents_only = 1;
307 if (!dotdot || dotdot[2])
309 return 0;
310 *dotdot = 0;
312 if (get_sha1_committish(arg, sha1)) {
313 *dotdot = '^';
314 return 0;
315 }
316 if (!parents_only)
318 show_rev(NORMAL, sha1, arg);
319 commit = lookup_commit_reference(sha1);
320 for (parents = commit->parents; parents; parents = parents->next)
321 show_rev(parents_only ? NORMAL : REVERSED,
322 parents->item->object.oid.hash, arg);
323 *dotdot = '^';
325 return 1;
326}
327static int parseopt_dump(const struct option *o, const char *arg, int unset)
329{
330 struct strbuf *parsed = o->value;
331 if (unset)
332 strbuf_addf(parsed, " --no-%s", o->long_name);
333 else if (o->short_name && (o->long_name == NULL || !stuck_long))
334 strbuf_addf(parsed, " -%c", o->short_name);
335 else
336 strbuf_addf(parsed, " --%s", o->long_name);
337 if (arg) {
338 if (!stuck_long)
339 strbuf_addch(parsed, ' ');
340 else if (o->long_name)
341 strbuf_addch(parsed, '=');
342 sq_quote_buf(parsed, arg);
343 }
344 return 0;
345}
346static const char *skipspaces(const char *s)
348{
349 while (isspace(*s))
350 s++;
351 return s;
352}
353static int cmd_parseopt(int argc, const char **argv, const char *prefix)
355{
356 static int keep_dashdash = 0, stop_at_non_option = 0;
357 static char const * const parseopt_usage[] = {
358 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
359 NULL
360 };
361 static struct option parseopt_opts[] = {
362 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
363 N_("keep the `--` passed as an arg")),
364 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
365 N_("stop parsing after the "
366 "first non-option argument")),
367 OPT_BOOL(0, "stuck-long", &stuck_long,
368 N_("output in stuck long form")),
369 OPT_END(),
370 };
371 static const char * const flag_chars = "*=?!";
372 struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
374 const char **usage = NULL;
375 struct option *opts = NULL;
376 int onb = 0, osz = 0, unb = 0, usz = 0;
377 strbuf_addstr(&parsed, "set --");
379 argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
380 PARSE_OPT_KEEP_DASHDASH);
381 if (argc < 1 || strcmp(argv[0], "--"))
382 usage_with_options(parseopt_usage, parseopt_opts);
383 /* get the usage up to the first line with a -- on it */
385 for (;;) {
386 if (strbuf_getline(&sb, stdin, '\n') == EOF)
387 die("premature end of input");
388 ALLOC_GROW(usage, unb + 1, usz);
389 if (!strcmp("--", sb.buf)) {
390 if (unb < 1)
391 die("no usage string given before the `--' separator");
392 usage[unb] = NULL;
393 break;
394 }
395 usage[unb++] = strbuf_detach(&sb, NULL);
396 }
397 /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
399 while (strbuf_getline(&sb, stdin, '\n') != EOF) {
400 const char *s;
401 const char *help;
402 struct option *o;
403 if (!sb.len)
405 continue;
406 ALLOC_GROW(opts, onb + 1, osz);
408 memset(opts + onb, 0, sizeof(opts[onb]));
409 o = &opts[onb++];
411 help = strchr(sb.buf, ' ');
412 if (!help || *sb.buf == ' ') {
413 o->type = OPTION_GROUP;
414 o->help = xstrdup(skipspaces(sb.buf));
415 continue;
416 }
417 o->type = OPTION_CALLBACK;
419 o->help = xstrdup(skipspaces(help));
420 o->value = &parsed;
421 o->flags = PARSE_OPT_NOARG;
422 o->callback = &parseopt_dump;
423 /* name(s) */
425 s = strpbrk(sb.buf, flag_chars);
426 if (s == NULL)
427 s = help;
428 if (s - sb.buf == 1) /* short option only */
430 o->short_name = *sb.buf;
431 else if (sb.buf[1] != ',') /* long option only */
432 o->long_name = xmemdupz(sb.buf, s - sb.buf);
433 else {
434 o->short_name = *sb.buf;
435 o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
436 }
437 /* flags */
439 while (s < help) {
440 switch (*s++) {
441 case '=':
442 o->flags &= ~PARSE_OPT_NOARG;
443 continue;
444 case '?':
445 o->flags &= ~PARSE_OPT_NOARG;
446 o->flags |= PARSE_OPT_OPTARG;
447 continue;
448 case '!':
449 o->flags |= PARSE_OPT_NONEG;
450 continue;
451 case '*':
452 o->flags |= PARSE_OPT_HIDDEN;
453 continue;
454 }
455 s--;
456 break;
457 }
458 if (s < help)
460 o->argh = xmemdupz(s, help - s);
461 }
462 strbuf_release(&sb);
463 /* put an OPT_END() */
465 ALLOC_GROW(opts, onb + 1, osz);
466 memset(opts + onb, 0, sizeof(opts[onb]));
467 argc = parse_options(argc, argv, prefix, opts, usage,
468 (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
469 (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
470 PARSE_OPT_SHELL_EVAL);
471 strbuf_addf(&parsed, " --");
473 sq_quote_argv(&parsed, argv, 0);
474 puts(parsed.buf);
475 return 0;
476}
477static int cmd_sq_quote(int argc, const char **argv)
479{
480 struct strbuf buf = STRBUF_INIT;
481 if (argc)
483 sq_quote_argv(&buf, argv, 0);
484 printf("%s\n", buf.buf);
485 strbuf_release(&buf);
486 return 0;
488}
489static void die_no_single_rev(int quiet)
491{
492 if (quiet)
493 exit(1);
494 else
495 die("Needed a single revision");
496}
497static const char builtin_rev_parse_usage[] =
499N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
500 " or: git rev-parse --sq-quote [<arg>...]\n"
501 " or: git rev-parse [<options>] [<arg>...]\n"
502 "\n"
503 "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
504int cmd_rev_parse(int argc, const char **argv, const char *prefix)
506{
507 int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
508 int has_dashdash = 0;
509 int output_prefix = 0;
510 unsigned char sha1[20];
511 unsigned int flags = 0;
512 const char *name = NULL;
513 struct object_context unused;
514 if (argc > 1 && !strcmp("--parseopt", argv[1]))
516 return cmd_parseopt(argc - 1, argv + 1, prefix);
517 if (argc > 1 && !strcmp("--sq-quote", argv[1]))
519 return cmd_sq_quote(argc - 2, argv + 2);
520 if (argc > 1 && !strcmp("-h", argv[1]))
522 usage(builtin_rev_parse_usage);
523 for (i = 1; i < argc; i++) {
525 if (!strcmp(argv[i], "--")) {
526 has_dashdash = 1;
527 break;
528 }
529 }
530 prefix = setup_git_directory();
532 git_config(git_default_config, NULL);
533 for (i = 1; i < argc; i++) {
534 const char *arg = argv[i];
535 if (!strcmp(arg, "--git-path")) {
537 if (!argv[i + 1])
538 die("--git-path requires an argument");
539 puts(git_path("%s", argv[i + 1]));
540 i++;
541 continue;
542 }
543 if (as_is) {
544 if (show_file(arg, output_prefix) && as_is < 2)
545 verify_filename(prefix, arg, 0);
546 continue;
547 }
548 if (!strcmp(arg,"-n")) {
549 if (++i >= argc)
550 die("-n requires an argument");
551 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
552 show(arg);
553 show(argv[i]);
554 }
555 continue;
556 }
557 if (starts_with(arg, "-n")) {
558 if ((filter & DO_FLAGS) && (filter & DO_REVS))
559 show(arg);
560 continue;
561 }
562 if (*arg == '-') {
564 if (!strcmp(arg, "--")) {
565 as_is = 2;
566 /* Pass on the "--" if we show anything but files.. */
567 if (filter & (DO_FLAGS | DO_REVS))
568 show_file(arg, 0);
569 continue;
570 }
571 if (!strcmp(arg, "--default")) {
572 def = argv[++i];
573 if (!def)
574 die("--default requires an argument");
575 continue;
576 }
577 if (!strcmp(arg, "--prefix")) {
578 prefix = argv[++i];
579 if (!prefix)
580 die("--prefix requires an argument");
581 startup_info->prefix = prefix;
582 output_prefix = 1;
583 continue;
584 }
585 if (!strcmp(arg, "--revs-only")) {
586 filter &= ~DO_NOREV;
587 continue;
588 }
589 if (!strcmp(arg, "--no-revs")) {
590 filter &= ~DO_REVS;
591 continue;
592 }
593 if (!strcmp(arg, "--flags")) {
594 filter &= ~DO_NONFLAGS;
595 continue;
596 }
597 if (!strcmp(arg, "--no-flags")) {
598 filter &= ~DO_FLAGS;
599 continue;
600 }
601 if (!strcmp(arg, "--verify")) {
602 filter &= ~(DO_FLAGS|DO_NOREV);
603 verify = 1;
604 continue;
605 }
606 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
607 quiet = 1;
608 flags |= GET_SHA1_QUIETLY;
609 continue;
610 }
611 if (!strcmp(arg, "--short") ||
612 starts_with(arg, "--short=")) {
613 filter &= ~(DO_FLAGS|DO_NOREV);
614 verify = 1;
615 abbrev = DEFAULT_ABBREV;
616 if (arg[7] == '=')
617 abbrev = strtoul(arg + 8, NULL, 10);
618 if (abbrev < MINIMUM_ABBREV)
619 abbrev = MINIMUM_ABBREV;
620 else if (40 <= abbrev)
621 abbrev = 40;
622 continue;
623 }
624 if (!strcmp(arg, "--sq")) {
625 output_sq = 1;
626 continue;
627 }
628 if (!strcmp(arg, "--not")) {
629 show_type ^= REVERSED;
630 continue;
631 }
632 if (!strcmp(arg, "--symbolic")) {
633 symbolic = SHOW_SYMBOLIC_ASIS;
634 continue;
635 }
636 if (!strcmp(arg, "--symbolic-full-name")) {
637 symbolic = SHOW_SYMBOLIC_FULL;
638 continue;
639 }
640 if (starts_with(arg, "--abbrev-ref") &&
641 (!arg[12] || arg[12] == '=')) {
642 abbrev_ref = 1;
643 abbrev_ref_strict = warn_ambiguous_refs;
644 if (arg[12] == '=') {
645 if (!strcmp(arg + 13, "strict"))
646 abbrev_ref_strict = 1;
647 else if (!strcmp(arg + 13, "loose"))
648 abbrev_ref_strict = 0;
649 else
650 die("unknown mode for %s", arg);
651 }
652 continue;
653 }
654 if (!strcmp(arg, "--all")) {
655 for_each_ref(show_reference, NULL);
656 continue;
657 }
658 if (starts_with(arg, "--disambiguate=")) {
659 for_each_abbrev(arg + 15, show_abbrev, NULL);
660 continue;
661 }
662 if (!strcmp(arg, "--bisect")) {
663 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
664 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
665 continue;
666 }
667 if (starts_with(arg, "--branches=")) {
668 for_each_glob_ref_in(show_reference, arg + 11,
669 "refs/heads/", NULL);
670 clear_ref_exclusion(&ref_excludes);
671 continue;
672 }
673 if (!strcmp(arg, "--branches")) {
674 for_each_branch_ref(show_reference, NULL);
675 clear_ref_exclusion(&ref_excludes);
676 continue;
677 }
678 if (starts_with(arg, "--tags=")) {
679 for_each_glob_ref_in(show_reference, arg + 7,
680 "refs/tags/", NULL);
681 clear_ref_exclusion(&ref_excludes);
682 continue;
683 }
684 if (!strcmp(arg, "--tags")) {
685 for_each_tag_ref(show_reference, NULL);
686 clear_ref_exclusion(&ref_excludes);
687 continue;
688 }
689 if (starts_with(arg, "--glob=")) {
690 for_each_glob_ref(show_reference, arg + 7, NULL);
691 clear_ref_exclusion(&ref_excludes);
692 continue;
693 }
694 if (starts_with(arg, "--remotes=")) {
695 for_each_glob_ref_in(show_reference, arg + 10,
696 "refs/remotes/", NULL);
697 clear_ref_exclusion(&ref_excludes);
698 continue;
699 }
700 if (!strcmp(arg, "--remotes")) {
701 for_each_remote_ref(show_reference, NULL);
702 clear_ref_exclusion(&ref_excludes);
703 continue;
704 }
705 if (starts_with(arg, "--exclude=")) {
706 add_ref_exclusion(&ref_excludes, arg + 10);
707 continue;
708 }
709 if (!strcmp(arg, "--local-env-vars")) {
710 int i;
711 for (i = 0; local_repo_env[i]; i++)
712 printf("%s\n", local_repo_env[i]);
713 continue;
714 }
715 if (!strcmp(arg, "--show-toplevel")) {
716 const char *work_tree = get_git_work_tree();
717 if (work_tree)
718 puts(work_tree);
719 continue;
720 }
721 if (!strcmp(arg, "--show-prefix")) {
722 if (prefix)
723 puts(prefix);
724 else
725 putchar('\n');
726 continue;
727 }
728 if (!strcmp(arg, "--show-cdup")) {
729 const char *pfx = prefix;
730 if (!is_inside_work_tree()) {
731 const char *work_tree =
732 get_git_work_tree();
733 if (work_tree)
734 printf("%s\n", work_tree);
735 continue;
736 }
737 while (pfx) {
738 pfx = strchr(pfx, '/');
739 if (pfx) {
740 pfx++;
741 printf("../");
742 }
743 }
744 putchar('\n');
745 continue;
746 }
747 if (!strcmp(arg, "--git-dir")) {
748 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
749 char *cwd;
750 int len;
751 if (gitdir) {
752 puts(gitdir);
753 continue;
754 }
755 if (!prefix) {
756 puts(".git");
757 continue;
758 }
759 cwd = xgetcwd();
760 len = strlen(cwd);
761 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
762 free(cwd);
763 continue;
764 }
765 if (!strcmp(arg, "--git-common-dir")) {
766 const char *pfx = prefix ? prefix : "";
767 puts(prefix_filename(pfx, strlen(pfx), get_git_common_dir()));
768 continue;
769 }
770 if (!strcmp(arg, "--resolve-git-dir")) {
771 const char *gitdir = argv[++i];
772 if (!gitdir)
773 die("--resolve-git-dir requires an argument");
774 gitdir = resolve_gitdir(gitdir);
775 if (!gitdir)
776 die("not a gitdir '%s'", argv[i]);
777 puts(gitdir);
778 continue;
779 }
780 if (!strcmp(arg, "--is-inside-git-dir")) {
781 printf("%s\n", is_inside_git_dir() ? "true"
782 : "false");
783 continue;
784 }
785 if (!strcmp(arg, "--is-inside-work-tree")) {
786 printf("%s\n", is_inside_work_tree() ? "true"
787 : "false");
788 continue;
789 }
790 if (!strcmp(arg, "--is-bare-repository")) {
791 printf("%s\n", is_bare_repository() ? "true"
792 : "false");
793 continue;
794 }
795 if (!strcmp(arg, "--shared-index-path")) {
796 if (read_cache() < 0)
797 die(_("Could not read the index"));
798 if (the_index.split_index) {
799 const unsigned char *sha1 = the_index.split_index->base_sha1;
800 puts(git_path("sharedindex.%s", sha1_to_hex(sha1)));
801 }
802 continue;
803 }
804 if (starts_with(arg, "--since=")) {
805 show_datestring("--max-age=", arg+8);
806 continue;
807 }
808 if (starts_with(arg, "--after=")) {
809 show_datestring("--max-age=", arg+8);
810 continue;
811 }
812 if (starts_with(arg, "--before=")) {
813 show_datestring("--min-age=", arg+9);
814 continue;
815 }
816 if (starts_with(arg, "--until=")) {
817 show_datestring("--min-age=", arg+8);
818 continue;
819 }
820 if (show_flag(arg) && verify)
821 die_no_single_rev(quiet);
822 continue;
823 }
824 /* Not a flag argument */
826 if (try_difference(arg))
827 continue;
828 if (try_parent_shorthands(arg))
829 continue;
830 name = arg;
831 type = NORMAL;
832 if (*arg == '^') {
833 name++;
834 type = REVERSED;
835 }
836 if (!get_sha1_with_context(name, flags, sha1, &unused)) {
837 if (verify)
838 revs_count++;
839 else
840 show_rev(type, sha1, name);
841 continue;
842 }
843 if (verify)
844 die_no_single_rev(quiet);
845 if (has_dashdash)
846 die("bad revision '%s'", arg);
847 as_is = 1;
848 if (!show_file(arg, output_prefix))
849 continue;
850 verify_filename(prefix, arg, 1);
851 }
852 if (verify) {
853 if (revs_count == 1) {
854 show_rev(type, sha1, name);
855 return 0;
856 } else if (revs_count == 0 && show_default())
857 return 0;
858 die_no_single_rev(quiet);
859 } else
860 show_default();
861 return 0;
862}