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                 *dotdot = '.';
 283                 return 1;
 284         }
 285         *dotdot = '.';
 286         return 0;
 287 }
 288
 289 static int try_parent_shorthands(const char *arg)
 290 {
 291         char *dotdot;
 292         unsigned char sha1[20];
 293         struct commit *commit;
 294         struct commit_list *parents;
 295         int parents_only;
 296
 297         if ((dotdot = strstr(arg, "^!")))
 298                 parents_only = 0;
 299         else if ((dotdot = strstr(arg, "^@")))
 300                 parents_only = 1;
 301
 302         if (!dotdot || dotdot[2])
 303                 return 0;
 304
 305         *dotdot = 0;
 306         if (get_sha1_committish(arg, sha1)) {
 307                 *dotdot = '^';
 308                 return 0;
 309         }
 310
 311         if (!parents_only)
 312                 show_rev(NORMAL, sha1, arg);
 313         commit = lookup_commit_reference(sha1);
 314         for (parents = commit->parents; parents; parents = parents->next)
 315                 show_rev(parents_only ? NORMAL : REVERSED,
 316                                 parents->item->object.sha1, arg);
 317
 318         *dotdot = '^';
 319         return 1;
 320 }
 321
 322 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 323 {
 324         struct strbuf *parsed = o->value;
 325         if (unset)
 326                 strbuf_addf(parsed, " --no-%s", o->long_name);
 327         else if (o->short_name)
 328                 strbuf_addf(parsed, " -%c", o->short_name);
 329         else
 330                 strbuf_addf(parsed, " --%s", o->long_name);
 331         if (arg) {
 332                 strbuf_addch(parsed, ' ');
 333                 sq_quote_buf(parsed, arg);
 334         }
 335         return 0;
 336 }
 337
 338 static const char *skipspaces(const char *s)
 339 {
 340         while (isspace(*s))
 341                 s++;
 342         return s;
 343 }
 344
 345 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 346 {
 347         static int keep_dashdash = 0, stop_at_non_option = 0;
 348         static char const * const parseopt_usage[] = {
 349                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
 350                 NULL
 351         };
 352         static struct option parseopt_opts[] = {
 353                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 354                                         N_("keep the `--` passed as an arg")),
 355                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 356                                         N_("stop parsing after the "
 357                                            "first non-option argument")),
 358                 OPT_END(),
 359         };
 360
 361         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 362         const char **usage = NULL;
 363         struct option *opts = NULL;
 364         int onb = 0, osz = 0, unb = 0, usz = 0;
 365
 366         strbuf_addstr(&parsed, "set --");
 367         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 368                              PARSE_OPT_KEEP_DASHDASH);
 369         if (argc < 1 || strcmp(argv[0], "--"))
 370                 usage_with_options(parseopt_usage, parseopt_opts);
 371
 372         /* get the usage up to the first line with a -- on it */
 373         for (;;) {
 374                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 375                         die("premature end of input");
 376                 ALLOC_GROW(usage, unb + 1, usz);
 377                 if (!strcmp("--", sb.buf)) {
 378                         if (unb < 1)
 379                                 die("no usage string given before the `--' separator");
 380                         usage[unb] = NULL;
 381                         break;
 382                 }
 383                 usage[unb++] = strbuf_detach(&sb, NULL);
 384         }
 385
 386         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 387         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 388                 const char *s;
 389                 struct option *o;
 390
 391                 if (!sb.len)
 392                         continue;
 393
 394                 ALLOC_GROW(opts, onb + 1, osz);
 395                 memset(opts + onb, 0, sizeof(opts[onb]));
 396
 397                 o = &opts[onb++];
 398                 s = strchr(sb.buf, ' ');
 399                 if (!s || *sb.buf == ' ') {
 400                         o->type = OPTION_GROUP;
 401                         o->help = xstrdup(skipspaces(sb.buf));
 402                         continue;
 403                 }
 404
 405                 o->type = OPTION_CALLBACK;
 406                 o->help = xstrdup(skipspaces(s));
 407                 o->value = &parsed;
 408                 o->flags = PARSE_OPT_NOARG;
 409                 o->callback = &parseopt_dump;
 410                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 411                         switch (*--s) {
 412                         case '=':
 413                                 o->flags &= ~PARSE_OPT_NOARG;
 414                                 break;
 415                         case '?':
 416                                 o->flags &= ~PARSE_OPT_NOARG;
 417                                 o->flags |= PARSE_OPT_OPTARG;
 418                                 break;
 419                         case '!':
 420                                 o->flags |= PARSE_OPT_NONEG;
 421                                 break;
 422                         case '*':
 423                                 o->flags |= PARSE_OPT_HIDDEN;
 424                                 break;
 425                         }
 426                 }
 427
 428                 if (s - sb.buf == 1) /* short option only */
 429                         o->short_name = *sb.buf;
 430                 else if (sb.buf[1] != ',') /* long option only */
 431                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 432                 else {
 433                         o->short_name = *sb.buf;
 434                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 435                 }
 436         }
 437         strbuf_release(&sb);
 438
 439         /* put an OPT_END() */
 440         ALLOC_GROW(opts, onb + 1, osz);
 441         memset(opts + onb, 0, sizeof(opts[onb]));
 442         argc = parse_options(argc, argv, prefix, opts, usage,
 443                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 444                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 445                         PARSE_OPT_SHELL_EVAL);
 446
 447         strbuf_addf(&parsed, " --");
 448         sq_quote_argv(&parsed, argv, 0);
 449         puts(parsed.buf);
 450         return 0;
 451 }
 452
 453 static int cmd_sq_quote(int argc, const char **argv)
 454 {
 455         struct strbuf buf = STRBUF_INIT;
 456
 457         if (argc)
 458                 sq_quote_argv(&buf, argv, 0);
 459         printf("%s\n", buf.buf);
 460         strbuf_release(&buf);
 461
 462         return 0;
 463 }
 464
 465 static void die_no_single_rev(int quiet)
 466 {
 467         if (quiet)
 468                 exit(1);
 469         else
 470                 die("Needed a single revision");
 471 }
 472
 473 static const char builtin_rev_parse_usage[] =
 474 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 475    "   or: git rev-parse --sq-quote [<arg>...]\n"
 476    "   or: git rev-parse [options] [<arg>...]\n"
 477    "\n"
 478    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 479
 480 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 481 {
 482         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 483         int has_dashdash = 0;
 484         int output_prefix = 0;
 485         unsigned char sha1[20];
 486         const char *name = NULL;
 487
 488         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 489                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 490
 491         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 492                 return cmd_sq_quote(argc - 2, argv + 2);
 493
 494         if (argc > 1 && !strcmp("-h", argv[1]))
 495                 usage(builtin_rev_parse_usage);
 496
 497         for (i = 1; i < argc; i++) {
 498                 if (!strcmp(argv[i], "--")) {
 499                         has_dashdash = 1;
 500                         break;
 501                 }
 502         }
 503
 504         prefix = setup_git_directory();
 505         git_config(git_default_config, NULL);
 506         for (i = 1; i < argc; i++) {
 507                 const char *arg = argv[i];
 508
 509                 if (as_is) {
 510                         if (show_file(arg, output_prefix) && as_is < 2)
 511                                 verify_filename(prefix, arg, 0);
 512                         continue;
 513                 }
 514                 if (!strcmp(arg,"-n")) {
 515                         if (++i >= argc)
 516                                 die("-n requires an argument");
 517                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 518                                 show(arg);
 519                                 show(argv[i]);
 520                         }
 521                         continue;
 522                 }
 523                 if (!prefixcmp(arg, "-n")) {
 524                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 525                                 show(arg);
 526                         continue;
 527                 }
 528
 529                 if (*arg == '-') {
 530                         if (!strcmp(arg, "--")) {
 531                                 as_is = 2;
 532                                 /* Pass on the "--" if we show anything but files.. */
 533                                 if (filter & (DO_FLAGS | DO_REVS))
 534                                         show_file(arg, 0);
 535                                 continue;
 536                         }
 537                         if (!strcmp(arg, "--default")) {
 538                                 def = argv[i+1];
 539                                 i++;
 540                                 continue;
 541                         }
 542                         if (!strcmp(arg, "--prefix")) {
 543                                 prefix = argv[i+1];
 544                                 startup_info->prefix = prefix;
 545                                 output_prefix = 1;
 546                                 i++;
 547                                 continue;
 548                         }
 549                         if (!strcmp(arg, "--revs-only")) {
 550                                 filter &= ~DO_NOREV;
 551                                 continue;
 552                         }
 553                         if (!strcmp(arg, "--no-revs")) {
 554                                 filter &= ~DO_REVS;
 555                                 continue;
 556                         }
 557                         if (!strcmp(arg, "--flags")) {
 558                                 filter &= ~DO_NONFLAGS;
 559                                 continue;
 560                         }
 561                         if (!strcmp(arg, "--no-flags")) {
 562                                 filter &= ~DO_FLAGS;
 563                                 continue;
 564                         }
 565                         if (!strcmp(arg, "--verify")) {
 566                                 filter &= ~(DO_FLAGS|DO_NOREV);
 567                                 verify = 1;
 568                                 continue;
 569                         }
 570                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 571                                 quiet = 1;
 572                                 continue;
 573                         }
 574                         if (!strcmp(arg, "--short") ||
 575                             !prefixcmp(arg, "--short=")) {
 576                                 filter &= ~(DO_FLAGS|DO_NOREV);
 577                                 verify = 1;
 578                                 abbrev = DEFAULT_ABBREV;
 579                                 if (arg[7] == '=')
 580                                         abbrev = strtoul(arg + 8, NULL, 10);
 581                                 if (abbrev < MINIMUM_ABBREV)
 582                                         abbrev = MINIMUM_ABBREV;
 583                                 else if (40 <= abbrev)
 584                                         abbrev = 40;
 585                                 continue;
 586                         }
 587                         if (!strcmp(arg, "--sq")) {
 588                                 output_sq = 1;
 589                                 continue;
 590                         }
 591                         if (!strcmp(arg, "--not")) {
 592                                 show_type ^= REVERSED;
 593                                 continue;
 594                         }
 595                         if (!strcmp(arg, "--symbolic")) {
 596                                 symbolic = SHOW_SYMBOLIC_ASIS;
 597                                 continue;
 598                         }
 599                         if (!strcmp(arg, "--symbolic-full-name")) {
 600                                 symbolic = SHOW_SYMBOLIC_FULL;
 601                                 continue;
 602                         }
 603                         if (!prefixcmp(arg, "--abbrev-ref") &&
 604                             (!arg[12] || arg[12] == '=')) {
 605                                 abbrev_ref = 1;
 606                                 abbrev_ref_strict = warn_ambiguous_refs;
 607                                 if (arg[12] == '=') {
 608                                         if (!strcmp(arg + 13, "strict"))
 609                                                 abbrev_ref_strict = 1;
 610                                         else if (!strcmp(arg + 13, "loose"))
 611                                                 abbrev_ref_strict = 0;
 612                                         else
 613                                                 die("unknown mode for %s", arg);
 614                                 }
 615                                 continue;
 616                         }
 617                         if (!strcmp(arg, "--all")) {
 618                                 for_each_ref(show_reference, NULL);
 619                                 continue;
 620                         }
 621                         if (!prefixcmp(arg, "--disambiguate=")) {
 622                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 623                                 continue;
 624                         }
 625                         if (!strcmp(arg, "--bisect")) {
 626                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 627                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 628                                 continue;
 629                         }
 630                         if (!prefixcmp(arg, "--branches=")) {
 631                                 for_each_glob_ref_in(show_reference, arg + 11,
 632                                         "refs/heads/", NULL);
 633                                 continue;
 634                         }
 635                         if (!strcmp(arg, "--branches")) {
 636                                 for_each_branch_ref(show_reference, NULL);
 637                                 continue;
 638                         }
 639                         if (!prefixcmp(arg, "--tags=")) {
 640                                 for_each_glob_ref_in(show_reference, arg + 7,
 641                                         "refs/tags/", NULL);
 642                                 continue;
 643                         }
 644                         if (!strcmp(arg, "--tags")) {
 645                                 for_each_tag_ref(show_reference, NULL);
 646                                 continue;
 647                         }
 648                         if (!prefixcmp(arg, "--glob=")) {
 649                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 650                                 continue;
 651                         }
 652                         if (!prefixcmp(arg, "--remotes=")) {
 653                                 for_each_glob_ref_in(show_reference, arg + 10,
 654                                         "refs/remotes/", NULL);
 655                                 continue;
 656                         }
 657                         if (!strcmp(arg, "--remotes")) {
 658                                 for_each_remote_ref(show_reference, NULL);
 659                                 continue;
 660                         }
 661                         if (!strcmp(arg, "--local-env-vars")) {
 662                                 int i;
 663                                 for (i = 0; local_repo_env[i]; i++)
 664                                         printf("%s\n", local_repo_env[i]);
 665                                 continue;
 666                         }
 667                         if (!strcmp(arg, "--show-toplevel")) {
 668                                 const char *work_tree = get_git_work_tree();
 669                                 if (work_tree)
 670                                         puts(work_tree);
 671                                 continue;
 672                         }
 673                         if (!strcmp(arg, "--show-prefix")) {
 674                                 if (prefix)
 675                                         puts(prefix);
 676                                 else
 677                                         putchar('\n');
 678                                 continue;
 679                         }
 680                         if (!strcmp(arg, "--show-cdup")) {
 681                                 const char *pfx = prefix;
 682                                 if (!is_inside_work_tree()) {
 683                                         const char *work_tree =
 684                                                 get_git_work_tree();
 685                                         if (work_tree)
 686                                                 printf("%s\n", work_tree);
 687                                         continue;
 688                                 }
 689                                 while (pfx) {
 690                                         pfx = strchr(pfx, '/');
 691                                         if (pfx) {
 692                                                 pfx++;
 693                                                 printf("../");
 694                                         }
 695                                 }
 696                                 putchar('\n');
 697                                 continue;
 698                         }
 699                         if (!strcmp(arg, "--git-dir")) {
 700                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 701                                 static char cwd[PATH_MAX];
 702                                 int len;
 703                                 if (gitdir) {
 704                                         puts(gitdir);
 705                                         continue;
 706                                 }
 707                                 if (!prefix) {
 708                                         puts(".git");
 709                                         continue;
 710                                 }
 711                                 if (!getcwd(cwd, PATH_MAX))
 712                                         die_errno("unable to get current working directory");
 713                                 len = strlen(cwd);
 714                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 715                                 continue;
 716                         }
 717                         if (!strcmp(arg, "--resolve-git-dir")) {
 718                                 const char *gitdir = resolve_gitdir(argv[i+1]);
 719                                 if (!gitdir)
 720                                         die("not a gitdir '%s'", argv[i+1]);
 721                                 puts(gitdir);
 722                                 continue;
 723                         }
 724                         if (!strcmp(arg, "--is-inside-git-dir")) {
 725                                 printf("%s\n", is_inside_git_dir() ? "true"
 726                                                 : "false");
 727                                 continue;
 728                         }
 729                         if (!strcmp(arg, "--is-inside-work-tree")) {
 730                                 printf("%s\n", is_inside_work_tree() ? "true"
 731                                                 : "false");
 732                                 continue;
 733                         }
 734                         if (!strcmp(arg, "--is-bare-repository")) {
 735                                 printf("%s\n", is_bare_repository() ? "true"
 736                                                 : "false");
 737                                 continue;
 738                         }
 739                         if (!prefixcmp(arg, "--since=")) {
 740                                 show_datestring("--max-age=", arg+8);
 741                                 continue;
 742                         }
 743                         if (!prefixcmp(arg, "--after=")) {
 744                                 show_datestring("--max-age=", arg+8);
 745                                 continue;
 746                         }
 747                         if (!prefixcmp(arg, "--before=")) {
 748                                 show_datestring("--min-age=", arg+9);
 749                                 continue;
 750                         }
 751                         if (!prefixcmp(arg, "--until=")) {
 752                                 show_datestring("--min-age=", arg+8);
 753                                 continue;
 754                         }
 755                         if (show_flag(arg) && verify)
 756                                 die_no_single_rev(quiet);
 757                         continue;
 758                 }
 759
 760                 /* Not a flag argument */
 761                 if (try_difference(arg))
 762                         continue;
 763                 if (try_parent_shorthands(arg))
 764                         continue;
 765                 name = arg;
 766                 type = NORMAL;
 767                 if (*arg == '^') {
 768                         name++;
 769                         type = REVERSED;
 770                 }
 771                 if (!get_sha1(name, sha1)) {
 772                         if (verify)
 773                                 revs_count++;
 774                         else
 775                                 show_rev(type, sha1, name);
 776                         continue;
 777                 }
 778                 if (verify)
 779                         die_no_single_rev(quiet);
 780                 if (has_dashdash)
 781                         die("bad revision '%s'", arg);
 782                 as_is = 1;
 783                 if (!show_file(arg, output_prefix))
 784                         continue;
 785                 verify_filename(prefix, arg, 1);
 786         }
 787         if (verify) {
 788                 if (revs_count == 1) {
 789                         show_rev(type, sha1, name);
 790                         return 0;
 791                 } else if (revs_count == 0 && show_default())
 792                         return 0;
 793                 die_no_single_rev(quiet);
 794         } else
 795                 show_default();
 796         return 0;
 797 }