git.oblomov.eu Git - git/blob - 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)
 216 {
 217         show_default();
 218         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 219                 show(arg);
 220                 return 1;
 221         }
 222         return 0;
 223 }
 224
 225 static int try_difference(const char *arg)
 226 {
 227         char *dotdot;
 228         unsigned char sha1[20];
 229         unsigned char end[20];
 230         const char *next;
 231         const char *this;
 232         int symmetric;
 233         static const char head_by_default[] = "HEAD";
 234
 235         if (!(dotdot = strstr(arg, "..")))
 236                 return 0;
 237         next = dotdot + 2;
 238         this = arg;
 239         symmetric = (*next == '.');
 240
 241         *dotdot = 0;
 242         next += symmetric;
 243
 244         if (!*next)
 245                 next = head_by_default;
 246         if (dotdot == arg)
 247                 this = head_by_default;
 248
 249         if (this == head_by_default && next == head_by_default &&
 250             !symmetric) {
 251                 /*
 252                  * Just ".."?  That is not a range but the
 253                  * pathspec for the parent directory.
 254                  */
 255                 *dotdot = '.';
 256                 return 0;
 257         }
 258
 259         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 260                 show_rev(NORMAL, end, next);
 261                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 262                 if (symmetric) {
 263                         struct commit_list *exclude;
 264                         struct commit *a, *b;
 265                         a = lookup_commit_reference(sha1);
 266                         b = lookup_commit_reference(end);
 267                         exclude = get_merge_bases(a, b, 1);
 268                         while (exclude) {
 269                                 struct commit_list *n = exclude->next;
 270                                 show_rev(REVERSED,
 271                                          exclude->item->object.sha1,NULL);
 272                                 free(exclude);
 273                                 exclude = n;
 274                         }
 275                 }
 276                 return 1;
 277         }
 278         *dotdot = '.';
 279         return 0;
 280 }
 281
 282 static int try_parent_shorthands(const char *arg)
 283 {
 284         char *dotdot;
 285         unsigned char sha1[20];
 286         struct commit *commit;
 287         struct commit_list *parents;
 288         int parents_only;
 289
 290         if ((dotdot = strstr(arg, "^!")))
 291                 parents_only = 0;
 292         else if ((dotdot = strstr(arg, "^@")))
 293                 parents_only = 1;
 294
 295         if (!dotdot || dotdot[2])
 296                 return 0;
 297
 298         *dotdot = 0;
 299         if (get_sha1_committish(arg, sha1))
 300                 return 0;
 301
 302         if (!parents_only)
 303                 show_rev(NORMAL, sha1, arg);
 304         commit = lookup_commit_reference(sha1);
 305         for (parents = commit->parents; parents; parents = parents->next)
 306                 show_rev(parents_only ? NORMAL : REVERSED,
 307                                 parents->item->object.sha1, arg);
 308
 309         return 1;
 310 }
 311
 312 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 313 {
 314         struct strbuf *parsed = o->value;
 315         if (unset)
 316                 strbuf_addf(parsed, " --no-%s", o->long_name);
 317         else if (o->short_name)
 318                 strbuf_addf(parsed, " -%c", o->short_name);
 319         else
 320                 strbuf_addf(parsed, " --%s", o->long_name);
 321         if (arg) {
 322                 strbuf_addch(parsed, ' ');
 323                 sq_quote_buf(parsed, arg);
 324         }
 325         return 0;
 326 }
 327
 328 static const char *skipspaces(const char *s)
 329 {
 330         while (isspace(*s))
 331                 s++;
 332         return s;
 333 }
 334
 335 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 336 {
 337         static int keep_dashdash = 0, stop_at_non_option = 0;
 338         static char const * const parseopt_usage[] = {
 339                 "git rev-parse --parseopt [options] -- [<args>...]",
 340                 NULL
 341         };
 342         static struct option parseopt_opts[] = {
 343                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 344                                         "keep the `--` passed as an arg"),
 345                 OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 346                                         "stop parsing after the "
 347                                         "first non-option argument"),
 348                 OPT_END(),
 349         };
 350
 351         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 352         const char **usage = NULL;
 353         struct option *opts = NULL;
 354         int onb = 0, osz = 0, unb = 0, usz = 0;
 355
 356         strbuf_addstr(&parsed, "set --");
 357         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 358                              PARSE_OPT_KEEP_DASHDASH);
 359         if (argc < 1 || strcmp(argv[0], "--"))
 360                 usage_with_options(parseopt_usage, parseopt_opts);
 361
 362         /* get the usage up to the first line with a -- on it */
 363         for (;;) {
 364                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 365                         die("premature end of input");
 366                 ALLOC_GROW(usage, unb + 1, usz);
 367                 if (!strcmp("--", sb.buf)) {
 368                         if (unb < 1)
 369                                 die("no usage string given before the `--' separator");
 370                         usage[unb] = NULL;
 371                         break;
 372                 }
 373                 usage[unb++] = strbuf_detach(&sb, NULL);
 374         }
 375
 376         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 377         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 378                 const char *s;
 379                 struct option *o;
 380
 381                 if (!sb.len)
 382                         continue;
 383
 384                 ALLOC_GROW(opts, onb + 1, osz);
 385                 memset(opts + onb, 0, sizeof(opts[onb]));
 386
 387                 o = &opts[onb++];
 388                 s = strchr(sb.buf, ' ');
 389                 if (!s || *sb.buf == ' ') {
 390                         o->type = OPTION_GROUP;
 391                         o->help = xstrdup(skipspaces(sb.buf));
 392                         continue;
 393                 }
 394
 395                 o->type = OPTION_CALLBACK;
 396                 o->help = xstrdup(skipspaces(s));
 397                 o->value = &parsed;
 398                 o->flags = PARSE_OPT_NOARG;
 399                 o->callback = &parseopt_dump;
 400                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 401                         switch (*--s) {
 402                         case '=':
 403                                 o->flags &= ~PARSE_OPT_NOARG;
 404                                 break;
 405                         case '?':
 406                                 o->flags &= ~PARSE_OPT_NOARG;
 407                                 o->flags |= PARSE_OPT_OPTARG;
 408                                 break;
 409                         case '!':
 410                                 o->flags |= PARSE_OPT_NONEG;
 411                                 break;
 412                         case '*':
 413                                 o->flags |= PARSE_OPT_HIDDEN;
 414                                 break;
 415                         }
 416                 }
 417
 418                 if (s - sb.buf == 1) /* short option only */
 419                         o->short_name = *sb.buf;
 420                 else if (sb.buf[1] != ',') /* long option only */
 421                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 422                 else {
 423                         o->short_name = *sb.buf;
 424                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 425                 }
 426         }
 427         strbuf_release(&sb);
 428
 429         /* put an OPT_END() */
 430         ALLOC_GROW(opts, onb + 1, osz);
 431         memset(opts + onb, 0, sizeof(opts[onb]));
 432         argc = parse_options(argc, argv, prefix, opts, usage,
 433                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 434                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 435                         PARSE_OPT_SHELL_EVAL);
 436
 437         strbuf_addf(&parsed, " --");
 438         sq_quote_argv(&parsed, argv, 0);
 439         puts(parsed.buf);
 440         return 0;
 441 }
 442
 443 static int cmd_sq_quote(int argc, const char **argv)
 444 {
 445         struct strbuf buf = STRBUF_INIT;
 446
 447         if (argc)
 448                 sq_quote_argv(&buf, argv, 0);
 449         printf("%s\n", buf.buf);
 450         strbuf_release(&buf);
 451
 452         return 0;
 453 }
 454
 455 static void die_no_single_rev(int quiet)
 456 {
 457         if (quiet)
 458                 exit(1);
 459         else
 460                 die("Needed a single revision");
 461 }
 462
 463 static const char builtin_rev_parse_usage[] =
 464 "git rev-parse --parseopt [options] -- [<args>...]\n"
 465 "   or: git rev-parse --sq-quote [<arg>...]\n"
 466 "   or: git rev-parse [options] [<arg>...]\n"
 467 "\n"
 468 "Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 469
 470 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 471 {
 472         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 473         unsigned char sha1[20];
 474         const char *name = NULL;
 475
 476         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 477                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 478
 479         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 480                 return cmd_sq_quote(argc - 2, argv + 2);
 481
 482         if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 483                 int i;
 484                 for (i = 0; local_repo_env[i]; i++)
 485                         printf("%s\n", local_repo_env[i]);
 486                 return 0;
 487         }
 488
 489         if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 490                 const char *gitdir = resolve_gitdir(argv[2]);
 491                 if (!gitdir)
 492                         die("not a gitdir '%s'", argv[2]);
 493                 puts(gitdir);
 494                 return 0;
 495         }
 496
 497         if (argc > 1 && !strcmp("-h", argv[1]))
 498                 usage(builtin_rev_parse_usage);
 499
 500         prefix = setup_git_directory();
 501         git_config(git_default_config, NULL);
 502         for (i = 1; i < argc; i++) {
 503                 const char *arg = argv[i];
 504
 505                 if (as_is) {
 506                         if (show_file(arg) && as_is < 2)
 507                                 verify_filename(prefix, arg, 0);
 508                         continue;
 509                 }
 510                 if (!strcmp(arg,"-n")) {
 511                         if (++i >= argc)
 512                                 die("-n requires an argument");
 513                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 514                                 show(arg);
 515                                 show(argv[i]);
 516                         }
 517                         continue;
 518                 }
 519                 if (!prefixcmp(arg, "-n")) {
 520                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 521                                 show(arg);
 522                         continue;
 523                 }
 524
 525                 if (*arg == '-') {
 526                         if (!strcmp(arg, "--")) {
 527                                 as_is = 2;
 528                                 /* Pass on the "--" if we show anything but files.. */
 529                                 if (filter & (DO_FLAGS | DO_REVS))
 530                                         show_file(arg);
 531                                 continue;
 532                         }
 533                         if (!strcmp(arg, "--default")) {
 534                                 def = argv[i+1];
 535                                 i++;
 536                                 continue;
 537                         }
 538                         if (!strcmp(arg, "--revs-only")) {
 539                                 filter &= ~DO_NOREV;
 540                                 continue;
 541                         }
 542                         if (!strcmp(arg, "--no-revs")) {
 543                                 filter &= ~DO_REVS;
 544                                 continue;
 545                         }
 546                         if (!strcmp(arg, "--flags")) {
 547                                 filter &= ~DO_NONFLAGS;
 548                                 continue;
 549                         }
 550                         if (!strcmp(arg, "--no-flags")) {
 551                                 filter &= ~DO_FLAGS;
 552                                 continue;
 553                         }
 554                         if (!strcmp(arg, "--verify")) {
 555                                 filter &= ~(DO_FLAGS|DO_NOREV);
 556                                 verify = 1;
 557                                 continue;
 558                         }
 559                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 560                                 quiet = 1;
 561                                 continue;
 562                         }
 563                         if (!strcmp(arg, "--short") ||
 564                             !prefixcmp(arg, "--short=")) {
 565                                 filter &= ~(DO_FLAGS|DO_NOREV);
 566                                 verify = 1;
 567                                 abbrev = DEFAULT_ABBREV;
 568                                 if (arg[7] == '=')
 569                                         abbrev = strtoul(arg + 8, NULL, 10);
 570                                 if (abbrev < MINIMUM_ABBREV)
 571                                         abbrev = MINIMUM_ABBREV;
 572                                 else if (40 <= abbrev)
 573                                         abbrev = 40;
 574                                 continue;
 575                         }
 576                         if (!strcmp(arg, "--sq")) {
 577                                 output_sq = 1;
 578                                 continue;
 579                         }
 580                         if (!strcmp(arg, "--not")) {
 581                                 show_type ^= REVERSED;
 582                                 continue;
 583                         }
 584                         if (!strcmp(arg, "--symbolic")) {
 585                                 symbolic = SHOW_SYMBOLIC_ASIS;
 586                                 continue;
 587                         }
 588                         if (!strcmp(arg, "--symbolic-full-name")) {
 589                                 symbolic = SHOW_SYMBOLIC_FULL;
 590                                 continue;
 591                         }
 592                         if (!prefixcmp(arg, "--abbrev-ref") &&
 593                             (!arg[12] || arg[12] == '=')) {
 594                                 abbrev_ref = 1;
 595                                 abbrev_ref_strict = warn_ambiguous_refs;
 596                                 if (arg[12] == '=') {
 597                                         if (!strcmp(arg + 13, "strict"))
 598                                                 abbrev_ref_strict = 1;
 599                                         else if (!strcmp(arg + 13, "loose"))
 600                                                 abbrev_ref_strict = 0;
 601                                         else
 602                                                 die("unknown mode for %s", arg);
 603                                 }
 604                                 continue;
 605                         }
 606                         if (!strcmp(arg, "--all")) {
 607                                 for_each_ref(show_reference, NULL);
 608                                 continue;
 609                         }
 610                         if (!prefixcmp(arg, "--disambiguate=")) {
 611                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 612                                 continue;
 613                         }
 614                         if (!strcmp(arg, "--bisect")) {
 615                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 616                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 617                                 continue;
 618                         }
 619                         if (!prefixcmp(arg, "--branches=")) {
 620                                 for_each_glob_ref_in(show_reference, arg + 11,
 621                                         "refs/heads/", NULL);
 622                                 continue;
 623                         }
 624                         if (!strcmp(arg, "--branches")) {
 625                                 for_each_branch_ref(show_reference, NULL);
 626                                 continue;
 627                         }
 628                         if (!prefixcmp(arg, "--tags=")) {
 629                                 for_each_glob_ref_in(show_reference, arg + 7,
 630                                         "refs/tags/", NULL);
 631                                 continue;
 632                         }
 633                         if (!strcmp(arg, "--tags")) {
 634                                 for_each_tag_ref(show_reference, NULL);
 635                                 continue;
 636                         }
 637                         if (!prefixcmp(arg, "--glob=")) {
 638                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 639                                 continue;
 640                         }
 641                         if (!prefixcmp(arg, "--remotes=")) {
 642                                 for_each_glob_ref_in(show_reference, arg + 10,
 643                                         "refs/remotes/", NULL);
 644                                 continue;
 645                         }
 646                         if (!strcmp(arg, "--remotes")) {
 647                                 for_each_remote_ref(show_reference, NULL);
 648                                 continue;
 649                         }
 650                         if (!strcmp(arg, "--show-toplevel")) {
 651                                 const char *work_tree = get_git_work_tree();
 652                                 if (work_tree)
 653                                         puts(work_tree);
 654                                 continue;
 655                         }
 656                         if (!strcmp(arg, "--show-prefix")) {
 657                                 if (prefix)
 658                                         puts(prefix);
 659                                 else
 660                                         putchar('\n');
 661                                 continue;
 662                         }
 663                         if (!strcmp(arg, "--show-cdup")) {
 664                                 const char *pfx = prefix;
 665                                 if (!is_inside_work_tree()) {
 666                                         const char *work_tree =
 667                                                 get_git_work_tree();
 668                                         if (work_tree)
 669                                                 printf("%s\n", work_tree);
 670                                         continue;
 671                                 }
 672                                 while (pfx) {
 673                                         pfx = strchr(pfx, '/');
 674                                         if (pfx) {
 675                                                 pfx++;
 676                                                 printf("../");
 677                                         }
 678                                 }
 679                                 putchar('\n');
 680                                 continue;
 681                         }
 682                         if (!strcmp(arg, "--git-dir")) {
 683                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 684                                 static char cwd[PATH_MAX];
 685                                 int len;
 686                                 if (gitdir) {
 687                                         puts(gitdir);
 688                                         continue;
 689                                 }
 690                                 if (!prefix) {
 691                                         puts(".git");
 692                                         continue;
 693                                 }
 694                                 if (!getcwd(cwd, PATH_MAX))
 695                                         die_errno("unable to get current working directory");
 696                                 len = strlen(cwd);
 697                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 698                                 continue;
 699                         }
 700                         if (!strcmp(arg, "--is-inside-git-dir")) {
 701                                 printf("%s\n", is_inside_git_dir() ? "true"
 702                                                 : "false");
 703                                 continue;
 704                         }
 705                         if (!strcmp(arg, "--is-inside-work-tree")) {
 706                                 printf("%s\n", is_inside_work_tree() ? "true"
 707                                                 : "false");
 708                                 continue;
 709                         }
 710                         if (!strcmp(arg, "--is-bare-repository")) {
 711                                 printf("%s\n", is_bare_repository() ? "true"
 712                                                 : "false");
 713                                 continue;
 714                         }
 715                         if (!prefixcmp(arg, "--since=")) {
 716                                 show_datestring("--max-age=", arg+8);
 717                                 continue;
 718                         }
 719                         if (!prefixcmp(arg, "--after=")) {
 720                                 show_datestring("--max-age=", arg+8);
 721                                 continue;
 722                         }
 723                         if (!prefixcmp(arg, "--before=")) {
 724                                 show_datestring("--min-age=", arg+9);
 725                                 continue;
 726                         }
 727                         if (!prefixcmp(arg, "--until=")) {
 728                                 show_datestring("--min-age=", arg+8);
 729                                 continue;
 730                         }
 731                         if (show_flag(arg) && verify)
 732                                 die_no_single_rev(quiet);
 733                         continue;
 734                 }
 735
 736                 /* Not a flag argument */
 737                 if (try_difference(arg))
 738                         continue;
 739                 if (try_parent_shorthands(arg))
 740                         continue;
 741                 name = arg;
 742                 type = NORMAL;
 743                 if (*arg == '^') {
 744                         name++;
 745                         type = REVERSED;
 746                 }
 747                 if (!get_sha1(name, sha1)) {
 748                         if (verify)
 749                                 revs_count++;
 750                         else
 751                                 show_rev(type, sha1, name);
 752                         continue;
 753                 }
 754                 if (verify)
 755                         die_no_single_rev(quiet);
 756                 as_is = 1;
 757                 if (!show_file(arg))
 758                         continue;
 759                 verify_filename(prefix, arg, 1);
 760         }
 761         if (verify) {
 762                 if (revs_count == 1) {
 763                         show_rev(type, sha1, name);
 764                         return 0;
 765                 } else if (revs_count == 0 && show_default())
 766                         return 0;
 767                 die_no_single_rev(quiet);
 768         } else
 769                 show_default();
 770         return 0;
 771 }