Merge branch 'bc/completion-for-bash-3.0'
[git] / builtin / rev-parse.c
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
13 #define DO_REVS         1
14 #define DO_NOREV        2
15 #define DO_FLAGS        4
16 #define DO_NONFLAGS     8
17 static int filter = ~0;
18
19 static const char *def;
20
21 #define NORMAL 0
22 #define REVERSED 1
23 static int show_type = NORMAL;
24
25 #define SHOW_SYMBOLIC_ASIS 1
26 #define SHOW_SYMBOLIC_FULL 2
27 static int symbolic;
28 static int abbrev;
29 static int abbrev_ref;
30 static int abbrev_ref_strict;
31 static int output_sq;
32
33 /*
34  * Some arguments are relevant "revision" arguments,
35  * others are about output format or other details.
36  * This sorts it all out.
37  */
38 static int is_rev_argument(const char *arg)
39 {
40         static const char *rev_args[] = {
41                 "--all",
42                 "--bisect",
43                 "--dense",
44                 "--branches=",
45                 "--branches",
46                 "--header",
47                 "--ignore-missing",
48                 "--max-age=",
49                 "--max-count=",
50                 "--min-age=",
51                 "--no-merges",
52                 "--min-parents=",
53                 "--no-min-parents",
54                 "--max-parents=",
55                 "--no-max-parents",
56                 "--objects",
57                 "--objects-edge",
58                 "--parents",
59                 "--pretty",
60                 "--remotes=",
61                 "--remotes",
62                 "--glob=",
63                 "--sparse",
64                 "--tags=",
65                 "--tags",
66                 "--topo-order",
67                 "--date-order",
68                 "--unpacked",
69                 NULL
70         };
71         const char **p = rev_args;
72
73         /* accept -<digit>, like traditional "head" */
74         if ((*arg == '-') && isdigit(arg[1]))
75                 return 1;
76
77         for (;;) {
78                 const char *str = *p++;
79                 int len;
80                 if (!str)
81                         return 0;
82                 len = strlen(str);
83                 if (!strcmp(arg, str) ||
84                     (str[len-1] == '=' && !strncmp(arg, str, len)))
85                         return 1;
86         }
87 }
88
89 /* Output argument as a string, either SQ or normal */
90 static void show(const char *arg)
91 {
92         if (output_sq) {
93                 int sq = '\'', ch;
94
95                 putchar(sq);
96                 while ((ch = *arg++)) {
97                         if (ch == sq)
98                                 fputs("'\\'", stdout);
99                         putchar(ch);
100                 }
101                 putchar(sq);
102                 putchar(' ');
103         }
104         else
105                 puts(arg);
106 }
107
108 /* Like show(), but with a negation prefix according to type */
109 static void show_with_type(int type, const char *arg)
110 {
111         if (type != show_type)
112                 putchar('^');
113         show(arg);
114 }
115
116 /* Output a revision, only if filter allows it */
117 static void show_rev(int type, const unsigned char *sha1, const char *name)
118 {
119         if (!(filter & DO_REVS))
120                 return;
121         def = NULL;
122
123         if ((symbolic || abbrev_ref) && name) {
124                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
125                         unsigned char discard[20];
126                         char *full;
127
128                         switch (dwim_ref(name, strlen(name), discard, &full)) {
129                         case 0:
130                                 /*
131                                  * Not found -- not a ref.  We could
132                                  * emit "name" here, but symbolic-full
133                                  * users are interested in finding the
134                                  * refs spelled in full, and they would
135                                  * need to filter non-refs if we did so.
136                                  */
137                                 break;
138                         case 1: /* happy */
139                                 if (abbrev_ref)
140                                         full = shorten_unambiguous_ref(full,
141                                                 abbrev_ref_strict);
142                                 show_with_type(type, full);
143                                 break;
144                         default: /* ambiguous */
145                                 error("refname '%s' is ambiguous", name);
146                                 break;
147                         }
148                 } else {
149                         show_with_type(type, name);
150                 }
151         }
152         else if (abbrev)
153                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
154         else
155                 show_with_type(type, sha1_to_hex(sha1));
156 }
157
158 /* Output a flag, only if filter allows it. */
159 static int show_flag(const char *arg)
160 {
161         if (!(filter & DO_FLAGS))
162                 return 0;
163         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
164                 show(arg);
165                 return 1;
166         }
167         return 0;
168 }
169
170 static int show_default(void)
171 {
172         const char *s = def;
173
174         if (s) {
175                 unsigned char sha1[20];
176
177                 def = NULL;
178                 if (!get_sha1(s, sha1)) {
179                         show_rev(NORMAL, sha1, s);
180                         return 1;
181                 }
182         }
183         return 0;
184 }
185
186 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
187 {
188         show_rev(NORMAL, sha1, refname);
189         return 0;
190 }
191
192 static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
193 {
194         show_rev(REVERSED, sha1, refname);
195         return 0;
196 }
197
198 static int show_abbrev(const unsigned char *sha1, void *cb_data)
199 {
200         show_rev(NORMAL, sha1, NULL);
201         return 0;
202 }
203
204 static void show_datestring(const char *flag, const char *datestr)
205 {
206         static char buffer[100];
207
208         /* date handling requires both flags and revs */
209         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
210                 return;
211         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
212         show(buffer);
213 }
214
215 static int show_file(const char *arg, int output_prefix)
216 {
217         show_default();
218         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
219                 if (output_prefix) {
220                         const char *prefix = startup_info->prefix;
221                         show(prefix_filename(prefix,
222                                              prefix ? strlen(prefix) : 0,
223                                              arg));
224                 } else
225                         show(arg);
226                 return 1;
227         }
228         return 0;
229 }
230
231 static int try_difference(const char *arg)
232 {
233         char *dotdot;
234         unsigned char sha1[20];
235         unsigned char end[20];
236         const char *next;
237         const char *this;
238         int symmetric;
239         static const char head_by_default[] = "HEAD";
240
241         if (!(dotdot = strstr(arg, "..")))
242                 return 0;
243         next = dotdot + 2;
244         this = arg;
245         symmetric = (*next == '.');
246
247         *dotdot = 0;
248         next += symmetric;
249
250         if (!*next)
251                 next = head_by_default;
252         if (dotdot == arg)
253                 this = head_by_default;
254
255         if (this == head_by_default && next == head_by_default &&
256             !symmetric) {
257                 /*
258                  * Just ".."?  That is not a range but the
259                  * pathspec for the parent directory.
260                  */
261                 *dotdot = '.';
262                 return 0;
263         }
264
265         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
266                 show_rev(NORMAL, end, next);
267                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
268                 if (symmetric) {
269                         struct commit_list *exclude;
270                         struct commit *a, *b;
271                         a = lookup_commit_reference(sha1);
272                         b = lookup_commit_reference(end);
273                         exclude = get_merge_bases(a, b, 1);
274                         while (exclude) {
275                                 struct commit_list *n = exclude->next;
276                                 show_rev(REVERSED,
277                                          exclude->item->object.sha1,NULL);
278                                 free(exclude);
279                                 exclude = n;
280                         }
281                 }
282                 return 1;
283         }
284         *dotdot = '.';
285         return 0;
286 }
287
288 static int try_parent_shorthands(const char *arg)
289 {
290         char *dotdot;
291         unsigned char sha1[20];
292         struct commit *commit;
293         struct commit_list *parents;
294         int parents_only;
295
296         if ((dotdot = strstr(arg, "^!")))
297                 parents_only = 0;
298         else if ((dotdot = strstr(arg, "^@")))
299                 parents_only = 1;
300
301         if (!dotdot || dotdot[2])
302                 return 0;
303
304         *dotdot = 0;
305         if (get_sha1_committish(arg, sha1))
306                 return 0;
307
308         if (!parents_only)
309                 show_rev(NORMAL, sha1, arg);
310         commit = lookup_commit_reference(sha1);
311         for (parents = commit->parents; parents; parents = parents->next)
312                 show_rev(parents_only ? NORMAL : REVERSED,
313                                 parents->item->object.sha1, arg);
314
315         return 1;
316 }
317
318 static int parseopt_dump(const struct option *o, const char *arg, int unset)
319 {
320         struct strbuf *parsed = o->value;
321         if (unset)
322                 strbuf_addf(parsed, " --no-%s", o->long_name);
323         else if (o->short_name)
324                 strbuf_addf(parsed, " -%c", o->short_name);
325         else
326                 strbuf_addf(parsed, " --%s", o->long_name);
327         if (arg) {
328                 strbuf_addch(parsed, ' ');
329                 sq_quote_buf(parsed, arg);
330         }
331         return 0;
332 }
333
334 static const char *skipspaces(const char *s)
335 {
336         while (isspace(*s))
337                 s++;
338         return s;
339 }
340
341 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
342 {
343         static int keep_dashdash = 0, stop_at_non_option = 0;
344         static char const * const parseopt_usage[] = {
345                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
346                 NULL
347         };
348         static struct option parseopt_opts[] = {
349                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
350                                         N_("keep the `--` passed as an arg")),
351                 OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
352                                         N_("stop parsing after the "
353                                            "first non-option argument")),
354                 OPT_END(),
355         };
356
357         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
358         const char **usage = NULL;
359         struct option *opts = NULL;
360         int onb = 0, osz = 0, unb = 0, usz = 0;
361
362         strbuf_addstr(&parsed, "set --");
363         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
364                              PARSE_OPT_KEEP_DASHDASH);
365         if (argc < 1 || strcmp(argv[0], "--"))
366                 usage_with_options(parseopt_usage, parseopt_opts);
367
368         /* get the usage up to the first line with a -- on it */
369         for (;;) {
370                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
371                         die("premature end of input");
372                 ALLOC_GROW(usage, unb + 1, usz);
373                 if (!strcmp("--", sb.buf)) {
374                         if (unb < 1)
375                                 die("no usage string given before the `--' separator");
376                         usage[unb] = NULL;
377                         break;
378                 }
379                 usage[unb++] = strbuf_detach(&sb, NULL);
380         }
381
382         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
383         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
384                 const char *s;
385                 struct option *o;
386
387                 if (!sb.len)
388                         continue;
389
390                 ALLOC_GROW(opts, onb + 1, osz);
391                 memset(opts + onb, 0, sizeof(opts[onb]));
392
393                 o = &opts[onb++];
394                 s = strchr(sb.buf, ' ');
395                 if (!s || *sb.buf == ' ') {
396                         o->type = OPTION_GROUP;
397                         o->help = xstrdup(skipspaces(sb.buf));
398                         continue;
399                 }
400
401                 o->type = OPTION_CALLBACK;
402                 o->help = xstrdup(skipspaces(s));
403                 o->value = &parsed;
404                 o->flags = PARSE_OPT_NOARG;
405                 o->callback = &parseopt_dump;
406                 while (s > sb.buf && strchr("*=?!", s[-1])) {
407                         switch (*--s) {
408                         case '=':
409                                 o->flags &= ~PARSE_OPT_NOARG;
410                                 break;
411                         case '?':
412                                 o->flags &= ~PARSE_OPT_NOARG;
413                                 o->flags |= PARSE_OPT_OPTARG;
414                                 break;
415                         case '!':
416                                 o->flags |= PARSE_OPT_NONEG;
417                                 break;
418                         case '*':
419                                 o->flags |= PARSE_OPT_HIDDEN;
420                                 break;
421                         }
422                 }
423
424                 if (s - sb.buf == 1) /* short option only */
425                         o->short_name = *sb.buf;
426                 else if (sb.buf[1] != ',') /* long option only */
427                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
428                 else {
429                         o->short_name = *sb.buf;
430                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
431                 }
432         }
433         strbuf_release(&sb);
434
435         /* put an OPT_END() */
436         ALLOC_GROW(opts, onb + 1, osz);
437         memset(opts + onb, 0, sizeof(opts[onb]));
438         argc = parse_options(argc, argv, prefix, opts, usage,
439                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
440                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
441                         PARSE_OPT_SHELL_EVAL);
442
443         strbuf_addf(&parsed, " --");
444         sq_quote_argv(&parsed, argv, 0);
445         puts(parsed.buf);
446         return 0;
447 }
448
449 static int cmd_sq_quote(int argc, const char **argv)
450 {
451         struct strbuf buf = STRBUF_INIT;
452
453         if (argc)
454                 sq_quote_argv(&buf, argv, 0);
455         printf("%s\n", buf.buf);
456         strbuf_release(&buf);
457
458         return 0;
459 }
460
461 static void die_no_single_rev(int quiet)
462 {
463         if (quiet)
464                 exit(1);
465         else
466                 die("Needed a single revision");
467 }
468
469 static const char builtin_rev_parse_usage[] =
470 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
471    "   or: git rev-parse --sq-quote [<arg>...]\n"
472    "   or: git rev-parse [options] [<arg>...]\n"
473    "\n"
474    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
475
476 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
477 {
478         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
479         int output_prefix = 0;
480         unsigned char sha1[20];
481         const char *name = NULL;
482
483         if (argc > 1 && !strcmp("--parseopt", argv[1]))
484                 return cmd_parseopt(argc - 1, argv + 1, prefix);
485
486         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
487                 return cmd_sq_quote(argc - 2, argv + 2);
488
489         if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
490                 int i;
491                 for (i = 0; local_repo_env[i]; i++)
492                         printf("%s\n", local_repo_env[i]);
493                 return 0;
494         }
495
496         if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
497                 const char *gitdir = resolve_gitdir(argv[2]);
498                 if (!gitdir)
499                         die("not a gitdir '%s'", argv[2]);
500                 puts(gitdir);
501                 return 0;
502         }
503
504         if (argc > 1 && !strcmp("-h", argv[1]))
505                 usage(builtin_rev_parse_usage);
506
507         prefix = setup_git_directory();
508         git_config(git_default_config, NULL);
509         for (i = 1; i < argc; i++) {
510                 const char *arg = argv[i];
511
512                 if (as_is) {
513                         if (show_file(arg, output_prefix) && as_is < 2)
514                                 verify_filename(prefix, arg, 0);
515                         continue;
516                 }
517                 if (!strcmp(arg,"-n")) {
518                         if (++i >= argc)
519                                 die("-n requires an argument");
520                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
521                                 show(arg);
522                                 show(argv[i]);
523                         }
524                         continue;
525                 }
526                 if (!prefixcmp(arg, "-n")) {
527                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
528                                 show(arg);
529                         continue;
530                 }
531
532                 if (*arg == '-') {
533                         if (!strcmp(arg, "--")) {
534                                 as_is = 2;
535                                 /* Pass on the "--" if we show anything but files.. */
536                                 if (filter & (DO_FLAGS | DO_REVS))
537                                         show_file(arg, 0);
538                                 continue;
539                         }
540                         if (!strcmp(arg, "--default")) {
541                                 def = argv[i+1];
542                                 i++;
543                                 continue;
544                         }
545                         if (!strcmp(arg, "--prefix")) {
546                                 prefix = argv[i+1];
547                                 startup_info->prefix = prefix;
548                                 output_prefix = 1;
549                                 i++;
550                                 continue;
551                         }
552                         if (!strcmp(arg, "--revs-only")) {
553                                 filter &= ~DO_NOREV;
554                                 continue;
555                         }
556                         if (!strcmp(arg, "--no-revs")) {
557                                 filter &= ~DO_REVS;
558                                 continue;
559                         }
560                         if (!strcmp(arg, "--flags")) {
561                                 filter &= ~DO_NONFLAGS;
562                                 continue;
563                         }
564                         if (!strcmp(arg, "--no-flags")) {
565                                 filter &= ~DO_FLAGS;
566                                 continue;
567                         }
568                         if (!strcmp(arg, "--verify")) {
569                                 filter &= ~(DO_FLAGS|DO_NOREV);
570                                 verify = 1;
571                                 continue;
572                         }
573                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
574                                 quiet = 1;
575                                 continue;
576                         }
577                         if (!strcmp(arg, "--short") ||
578                             !prefixcmp(arg, "--short=")) {
579                                 filter &= ~(DO_FLAGS|DO_NOREV);
580                                 verify = 1;
581                                 abbrev = DEFAULT_ABBREV;
582                                 if (arg[7] == '=')
583                                         abbrev = strtoul(arg + 8, NULL, 10);
584                                 if (abbrev < MINIMUM_ABBREV)
585                                         abbrev = MINIMUM_ABBREV;
586                                 else if (40 <= abbrev)
587                                         abbrev = 40;
588                                 continue;
589                         }
590                         if (!strcmp(arg, "--sq")) {
591                                 output_sq = 1;
592                                 continue;
593                         }
594                         if (!strcmp(arg, "--not")) {
595                                 show_type ^= REVERSED;
596                                 continue;
597                         }
598                         if (!strcmp(arg, "--symbolic")) {
599                                 symbolic = SHOW_SYMBOLIC_ASIS;
600                                 continue;
601                         }
602                         if (!strcmp(arg, "--symbolic-full-name")) {
603                                 symbolic = SHOW_SYMBOLIC_FULL;
604                                 continue;
605                         }
606                         if (!prefixcmp(arg, "--abbrev-ref") &&
607                             (!arg[12] || arg[12] == '=')) {
608                                 abbrev_ref = 1;
609                                 abbrev_ref_strict = warn_ambiguous_refs;
610                                 if (arg[12] == '=') {
611                                         if (!strcmp(arg + 13, "strict"))
612                                                 abbrev_ref_strict = 1;
613                                         else if (!strcmp(arg + 13, "loose"))
614                                                 abbrev_ref_strict = 0;
615                                         else
616                                                 die("unknown mode for %s", arg);
617                                 }
618                                 continue;
619                         }
620                         if (!strcmp(arg, "--all")) {
621                                 for_each_ref(show_reference, NULL);
622                                 continue;
623                         }
624                         if (!prefixcmp(arg, "--disambiguate=")) {
625                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
626                                 continue;
627                         }
628                         if (!strcmp(arg, "--bisect")) {
629                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
630                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
631                                 continue;
632                         }
633                         if (!prefixcmp(arg, "--branches=")) {
634                                 for_each_glob_ref_in(show_reference, arg + 11,
635                                         "refs/heads/", NULL);
636                                 continue;
637                         }
638                         if (!strcmp(arg, "--branches")) {
639                                 for_each_branch_ref(show_reference, NULL);
640                                 continue;
641                         }
642                         if (!prefixcmp(arg, "--tags=")) {
643                                 for_each_glob_ref_in(show_reference, arg + 7,
644                                         "refs/tags/", NULL);
645                                 continue;
646                         }
647                         if (!strcmp(arg, "--tags")) {
648                                 for_each_tag_ref(show_reference, NULL);
649                                 continue;
650                         }
651                         if (!prefixcmp(arg, "--glob=")) {
652                                 for_each_glob_ref(show_reference, arg + 7, NULL);
653                                 continue;
654                         }
655                         if (!prefixcmp(arg, "--remotes=")) {
656                                 for_each_glob_ref_in(show_reference, arg + 10,
657                                         "refs/remotes/", NULL);
658                                 continue;
659                         }
660                         if (!strcmp(arg, "--remotes")) {
661                                 for_each_remote_ref(show_reference, NULL);
662                                 continue;
663                         }
664                         if (!strcmp(arg, "--show-toplevel")) {
665                                 const char *work_tree = get_git_work_tree();
666                                 if (work_tree)
667                                         puts(work_tree);
668                                 continue;
669                         }
670                         if (!strcmp(arg, "--show-prefix")) {
671                                 if (prefix)
672                                         puts(prefix);
673                                 else
674                                         putchar('\n');
675                                 continue;
676                         }
677                         if (!strcmp(arg, "--show-cdup")) {
678                                 const char *pfx = prefix;
679                                 if (!is_inside_work_tree()) {
680                                         const char *work_tree =
681                                                 get_git_work_tree();
682                                         if (work_tree)
683                                                 printf("%s\n", work_tree);
684                                         continue;
685                                 }
686                                 while (pfx) {
687                                         pfx = strchr(pfx, '/');
688                                         if (pfx) {
689                                                 pfx++;
690                                                 printf("../");
691                                         }
692                                 }
693                                 putchar('\n');
694                                 continue;
695                         }
696                         if (!strcmp(arg, "--git-dir")) {
697                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
698                                 static char cwd[PATH_MAX];
699                                 int len;
700                                 if (gitdir) {
701                                         puts(gitdir);
702                                         continue;
703                                 }
704                                 if (!prefix) {
705                                         puts(".git");
706                                         continue;
707                                 }
708                                 if (!getcwd(cwd, PATH_MAX))
709                                         die_errno("unable to get current working directory");
710                                 len = strlen(cwd);
711                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
712                                 continue;
713                         }
714                         if (!strcmp(arg, "--is-inside-git-dir")) {
715                                 printf("%s\n", is_inside_git_dir() ? "true"
716                                                 : "false");
717                                 continue;
718                         }
719                         if (!strcmp(arg, "--is-inside-work-tree")) {
720                                 printf("%s\n", is_inside_work_tree() ? "true"
721                                                 : "false");
722                                 continue;
723                         }
724                         if (!strcmp(arg, "--is-bare-repository")) {
725                                 printf("%s\n", is_bare_repository() ? "true"
726                                                 : "false");
727                                 continue;
728                         }
729                         if (!prefixcmp(arg, "--since=")) {
730                                 show_datestring("--max-age=", arg+8);
731                                 continue;
732                         }
733                         if (!prefixcmp(arg, "--after=")) {
734                                 show_datestring("--max-age=", arg+8);
735                                 continue;
736                         }
737                         if (!prefixcmp(arg, "--before=")) {
738                                 show_datestring("--min-age=", arg+9);
739                                 continue;
740                         }
741                         if (!prefixcmp(arg, "--until=")) {
742                                 show_datestring("--min-age=", arg+8);
743                                 continue;
744                         }
745                         if (show_flag(arg) && verify)
746                                 die_no_single_rev(quiet);
747                         continue;
748                 }
749
750                 /* Not a flag argument */
751                 if (try_difference(arg))
752                         continue;
753                 if (try_parent_shorthands(arg))
754                         continue;
755                 name = arg;
756                 type = NORMAL;
757                 if (*arg == '^') {
758                         name++;
759                         type = REVERSED;
760                 }
761                 if (!get_sha1(name, sha1)) {
762                         if (verify)
763                                 revs_count++;
764                         else
765                                 show_rev(type, sha1, name);
766                         continue;
767                 }
768                 if (verify)
769                         die_no_single_rev(quiet);
770                 as_is = 1;
771                 if (!show_file(arg, output_prefix))
772                         continue;
773                 verify_filename(prefix, arg, 1);
774         }
775         if (verify) {
776                 if (revs_count == 1) {
777                         show_rev(type, sha1, name);
778                         return 0;
779                 } else if (revs_count == 0 && show_default())
780                         return 0;
781                 die_no_single_rev(quiet);
782         } else
783                 show_default();
784         return 0;
785 }