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 #include "diff.h"
  13 #include "revision.h"
  14
  15 #define DO_REVS         1
  16 #define DO_NOREV        2
  17 #define DO_FLAGS        4
  18 #define DO_NONFLAGS     8
  19 static int filter = ~0;
  20
  21 static const char *def;
  22
  23 #define NORMAL 0
  24 #define REVERSED 1
  25 static int show_type = NORMAL;
  26
  27 #define SHOW_SYMBOLIC_ASIS 1
  28 #define SHOW_SYMBOLIC_FULL 2
  29 static int symbolic;
  30 static int abbrev;
  31 static int abbrev_ref;
  32 static int abbrev_ref_strict;
  33 static int output_sq;
  34
  35 static struct string_list *ref_excludes;
  36
  37 /*
  38  * Some arguments are relevant "revision" arguments,
  39  * others are about output format or other details.
  40  * This sorts it all out.
  41  */
  42 static int is_rev_argument(const char *arg)
  43 {
  44         static const char *rev_args[] = {
  45                 "--all",
  46                 "--bisect",
  47                 "--dense",
  48                 "--branches=",
  49                 "--branches",
  50                 "--header",
  51                 "--ignore-missing",
  52                 "--max-age=",
  53                 "--max-count=",
  54                 "--min-age=",
  55                 "--no-merges",
  56                 "--min-parents=",
  57                 "--no-min-parents",
  58                 "--max-parents=",
  59                 "--no-max-parents",
  60                 "--objects",
  61                 "--objects-edge",
  62                 "--parents",
  63                 "--pretty",
  64                 "--remotes=",
  65                 "--remotes",
  66                 "--glob=",
  67                 "--sparse",
  68                 "--tags=",
  69                 "--tags",
  70                 "--topo-order",
  71                 "--date-order",
  72                 "--unpacked",
  73                 NULL
  74         };
  75         const char **p = rev_args;
  76
  77         /* accept -<digit>, like traditional "head" */
  78         if ((*arg == '-') && isdigit(arg[1]))
  79                 return 1;
  80
  81         for (;;) {
  82                 const char *str = *p++;
  83                 int len;
  84                 if (!str)
  85                         return 0;
  86                 len = strlen(str);
  87                 if (!strcmp(arg, str) ||
  88                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  89                         return 1;
  90         }
  91 }
  92
  93 /* Output argument as a string, either SQ or normal */
  94 static void show(const char *arg)
  95 {
  96         if (output_sq) {
  97                 int sq = '\'', ch;
  98
  99                 putchar(sq);
 100                 while ((ch = *arg++)) {
 101                         if (ch == sq)
 102                                 fputs("'\\'", stdout);
 103                         putchar(ch);
 104                 }
 105                 putchar(sq);
 106                 putchar(' ');
 107         }
 108         else
 109                 puts(arg);
 110 }
 111
 112 /* Like show(), but with a negation prefix according to type */
 113 static void show_with_type(int type, const char *arg)
 114 {
 115         if (type != show_type)
 116                 putchar('^');
 117         show(arg);
 118 }
 119
 120 /* Output a revision, only if filter allows it */
 121 static void show_rev(int type, const unsigned char *sha1, const char *name)
 122 {
 123         if (!(filter & DO_REVS))
 124                 return;
 125         def = NULL;
 126
 127         if ((symbolic || abbrev_ref) && name) {
 128                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 129                         unsigned char discard[20];
 130                         char *full;
 131
 132                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 133                         case 0:
 134                                 /*
 135                                  * Not found -- not a ref.  We could
 136                                  * emit "name" here, but symbolic-full
 137                                  * users are interested in finding the
 138                                  * refs spelled in full, and they would
 139                                  * need to filter non-refs if we did so.
 140                                  */
 141                                 break;
 142                         case 1: /* happy */
 143                                 if (abbrev_ref)
 144                                         full = shorten_unambiguous_ref(full,
 145                                                 abbrev_ref_strict);
 146                                 show_with_type(type, full);
 147                                 break;
 148                         default: /* ambiguous */
 149                                 error("refname '%s' is ambiguous", name);
 150                                 break;
 151                         }
 152                 } else {
 153                         show_with_type(type, name);
 154                 }
 155         }
 156         else if (abbrev)
 157                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 158         else
 159                 show_with_type(type, sha1_to_hex(sha1));
 160 }
 161
 162 /* Output a flag, only if filter allows it. */
 163 static int show_flag(const char *arg)
 164 {
 165         if (!(filter & DO_FLAGS))
 166                 return 0;
 167         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 168                 show(arg);
 169                 return 1;
 170         }
 171         return 0;
 172 }
 173
 174 static int show_default(void)
 175 {
 176         const char *s = def;
 177
 178         if (s) {
 179                 unsigned char sha1[20];
 180
 181                 def = NULL;
 182                 if (!get_sha1(s, sha1)) {
 183                         show_rev(NORMAL, sha1, s);
 184                         return 1;
 185                 }
 186         }
 187         return 0;
 188 }
 189
 190 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 191 {
 192         if (ref_excluded(ref_excludes, refname))
 193                 return 0;
 194         show_rev(NORMAL, sha1, refname);
 195         return 0;
 196 }
 197
 198 static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 199 {
 200         show_rev(REVERSED, sha1, refname);
 201         return 0;
 202 }
 203
 204 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 205 {
 206         show_rev(NORMAL, sha1, NULL);
 207         return 0;
 208 }
 209
 210 static void show_datestring(const char *flag, const char *datestr)
 211 {
 212         static char buffer[100];
 213
 214         /* date handling requires both flags and revs */
 215         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 216                 return;
 217         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 218         show(buffer);
 219 }
 220
 221 static int show_file(const char *arg, int output_prefix)
 222 {
 223         show_default();
 224         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 225                 if (output_prefix) {
 226                         const char *prefix = startup_info->prefix;
 227                         show(prefix_filename(prefix,
 228                                              prefix ? strlen(prefix) : 0,
 229                                              arg));
 230                 } else
 231                         show(arg);
 232                 return 1;
 233         }
 234         return 0;
 235 }
 236
 237 static int try_difference(const char *arg)
 238 {
 239         char *dotdot;
 240         unsigned char sha1[20];
 241         unsigned char end[20];
 242         const char *next;
 243         const char *this;
 244         int symmetric;
 245         static const char head_by_default[] = "HEAD";
 246
 247         if (!(dotdot = strstr(arg, "..")))
 248                 return 0;
 249         next = dotdot + 2;
 250         this = arg;
 251         symmetric = (*next == '.');
 252
 253         *dotdot = 0;
 254         next += symmetric;
 255
 256         if (!*next)
 257                 next = head_by_default;
 258         if (dotdot == arg)
 259                 this = head_by_default;
 260
 261         if (this == head_by_default && next == head_by_default &&
 262             !symmetric) {
 263                 /*
 264                  * Just ".."?  That is not a range but the
 265                  * pathspec for the parent directory.
 266                  */
 267                 *dotdot = '.';
 268                 return 0;
 269         }
 270
 271         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 272                 show_rev(NORMAL, end, next);
 273                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 274                 if (symmetric) {
 275                         struct commit_list *exclude;
 276                         struct commit *a, *b;
 277                         a = lookup_commit_reference(sha1);
 278                         b = lookup_commit_reference(end);
 279                         exclude = get_merge_bases(a, b, 1);
 280                         while (exclude) {
 281                                 struct commit_list *n = exclude->next;
 282                                 show_rev(REVERSED,
 283                                          exclude->item->object.sha1,NULL);
 284                                 free(exclude);
 285                                 exclude = n;
 286                         }
 287                 }
 288                 return 1;
 289         }
 290         *dotdot = '.';
 291         return 0;
 292 }
 293
 294 static int try_parent_shorthands(const char *arg)
 295 {
 296         char *dotdot;
 297         unsigned char sha1[20];
 298         struct commit *commit;
 299         struct commit_list *parents;
 300         int parents_only;
 301
 302         if ((dotdot = strstr(arg, "^!")))
 303                 parents_only = 0;
 304         else if ((dotdot = strstr(arg, "^@")))
 305                 parents_only = 1;
 306
 307         if (!dotdot || dotdot[2])
 308                 return 0;
 309
 310         *dotdot = 0;
 311         if (get_sha1_committish(arg, sha1))
 312                 return 0;
 313
 314         if (!parents_only)
 315                 show_rev(NORMAL, sha1, arg);
 316         commit = lookup_commit_reference(sha1);
 317         for (parents = commit->parents; parents; parents = parents->next)
 318                 show_rev(parents_only ? NORMAL : REVERSED,
 319                                 parents->item->object.sha1, arg);
 320
 321         return 1;
 322 }
 323
 324 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 325 {
 326         struct strbuf *parsed = o->value;
 327         if (unset)
 328                 strbuf_addf(parsed, " --no-%s", o->long_name);
 329         else if (o->short_name)
 330                 strbuf_addf(parsed, " -%c", o->short_name);
 331         else
 332                 strbuf_addf(parsed, " --%s", o->long_name);
 333         if (arg) {
 334                 strbuf_addch(parsed, ' ');
 335                 sq_quote_buf(parsed, arg);
 336         }
 337         return 0;
 338 }
 339
 340 static const char *skipspaces(const char *s)
 341 {
 342         while (isspace(*s))
 343                 s++;
 344         return s;
 345 }
 346
 347 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 348 {
 349         static int keep_dashdash = 0, stop_at_non_option = 0;
 350         static char const * const parseopt_usage[] = {
 351                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
 352                 NULL
 353         };
 354         static struct option parseopt_opts[] = {
 355                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 356                                         N_("keep the `--` passed as an arg")),
 357                 OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 358                                         N_("stop parsing after the "
 359                                            "first non-option argument")),
 360                 OPT_END(),
 361         };
 362
 363         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 364         const char **usage = NULL;
 365         struct option *opts = NULL;
 366         int onb = 0, osz = 0, unb = 0, usz = 0;
 367
 368         strbuf_addstr(&parsed, "set --");
 369         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 370                              PARSE_OPT_KEEP_DASHDASH);
 371         if (argc < 1 || strcmp(argv[0], "--"))
 372                 usage_with_options(parseopt_usage, parseopt_opts);
 373
 374         /* get the usage up to the first line with a -- on it */
 375         for (;;) {
 376                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 377                         die("premature end of input");
 378                 ALLOC_GROW(usage, unb + 1, usz);
 379                 if (!strcmp("--", sb.buf)) {
 380                         if (unb < 1)
 381                                 die("no usage string given before the `--' separator");
 382                         usage[unb] = NULL;
 383                         break;
 384                 }
 385                 usage[unb++] = strbuf_detach(&sb, NULL);
 386         }
 387
 388         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 389         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 390                 const char *s;
 391                 struct option *o;
 392
 393                 if (!sb.len)
 394                         continue;
 395
 396                 ALLOC_GROW(opts, onb + 1, osz);
 397                 memset(opts + onb, 0, sizeof(opts[onb]));
 398
 399                 o = &opts[onb++];
 400                 s = strchr(sb.buf, ' ');
 401                 if (!s || *sb.buf == ' ') {
 402                         o->type = OPTION_GROUP;
 403                         o->help = xstrdup(skipspaces(sb.buf));
 404                         continue;
 405                 }
 406
 407                 o->type = OPTION_CALLBACK;
 408                 o->help = xstrdup(skipspaces(s));
 409                 o->value = &parsed;
 410                 o->flags = PARSE_OPT_NOARG;
 411                 o->callback = &parseopt_dump;
 412                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 413                         switch (*--s) {
 414                         case '=':
 415                                 o->flags &= ~PARSE_OPT_NOARG;
 416                                 break;
 417                         case '?':
 418                                 o->flags &= ~PARSE_OPT_NOARG;
 419                                 o->flags |= PARSE_OPT_OPTARG;
 420                                 break;
 421                         case '!':
 422                                 o->flags |= PARSE_OPT_NONEG;
 423                                 break;
 424                         case '*':
 425                                 o->flags |= PARSE_OPT_HIDDEN;
 426                                 break;
 427                         }
 428                 }
 429
 430                 if (s - sb.buf == 1) /* short option only */
 431                         o->short_name = *sb.buf;
 432                 else if (sb.buf[1] != ',') /* long option only */
 433                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 434                 else {
 435                         o->short_name = *sb.buf;
 436                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 437                 }
 438         }
 439         strbuf_release(&sb);
 440
 441         /* put an OPT_END() */
 442         ALLOC_GROW(opts, onb + 1, osz);
 443         memset(opts + onb, 0, sizeof(opts[onb]));
 444         argc = parse_options(argc, argv, prefix, opts, usage,
 445                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 446                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 447                         PARSE_OPT_SHELL_EVAL);
 448
 449         strbuf_addf(&parsed, " --");
 450         sq_quote_argv(&parsed, argv, 0);
 451         puts(parsed.buf);
 452         return 0;
 453 }
 454
 455 static int cmd_sq_quote(int argc, const char **argv)
 456 {
 457         struct strbuf buf = STRBUF_INIT;
 458
 459         if (argc)
 460                 sq_quote_argv(&buf, argv, 0);
 461         printf("%s\n", buf.buf);
 462         strbuf_release(&buf);
 463
 464         return 0;
 465 }
 466
 467 static void die_no_single_rev(int quiet)
 468 {
 469         if (quiet)
 470                 exit(1);
 471         else
 472                 die("Needed a single revision");
 473 }
 474
 475 static const char builtin_rev_parse_usage[] =
 476 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 477    "   or: git rev-parse --sq-quote [<arg>...]\n"
 478    "   or: git rev-parse [options] [<arg>...]\n"
 479    "\n"
 480    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 481
 482 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 483 {
 484         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 485         int output_prefix = 0;
 486         unsigned char sha1[20];
 487         const char *name = NULL;
 488
 489         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 490                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 491
 492         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 493                 return cmd_sq_quote(argc - 2, argv + 2);
 494
 495         if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 496                 int i;
 497                 for (i = 0; local_repo_env[i]; i++)
 498                         printf("%s\n", local_repo_env[i]);
 499                 return 0;
 500         }
 501
 502         if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 503                 const char *gitdir = resolve_gitdir(argv[2]);
 504                 if (!gitdir)
 505                         die("not a gitdir '%s'", argv[2]);
 506                 puts(gitdir);
 507                 return 0;
 508         }
 509
 510         if (argc > 1 && !strcmp("-h", argv[1]))
 511                 usage(builtin_rev_parse_usage);
 512
 513         prefix = setup_git_directory();
 514         git_config(git_default_config, NULL);
 515         for (i = 1; i < argc; i++) {
 516                 const char *arg = argv[i];
 517
 518                 if (as_is) {
 519                         if (show_file(arg, output_prefix) && as_is < 2)
 520                                 verify_filename(prefix, arg, 0);
 521                         continue;
 522                 }
 523                 if (!strcmp(arg,"-n")) {
 524                         if (++i >= argc)
 525                                 die("-n requires an argument");
 526                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 527                                 show(arg);
 528                                 show(argv[i]);
 529                         }
 530                         continue;
 531                 }
 532                 if (!prefixcmp(arg, "-n")) {
 533                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 534                                 show(arg);
 535                         continue;
 536                 }
 537
 538                 if (*arg == '-') {
 539                         if (!strcmp(arg, "--")) {
 540                                 as_is = 2;
 541                                 /* Pass on the "--" if we show anything but files.. */
 542                                 if (filter & (DO_FLAGS | DO_REVS))
 543                                         show_file(arg, 0);
 544                                 continue;
 545                         }
 546                         if (!strcmp(arg, "--default")) {
 547                                 def = argv[i+1];
 548                                 i++;
 549                                 continue;
 550                         }
 551                         if (!strcmp(arg, "--prefix")) {
 552                                 prefix = argv[i+1];
 553                                 startup_info->prefix = prefix;
 554                                 output_prefix = 1;
 555                                 i++;
 556                                 continue;
 557                         }
 558                         if (!strcmp(arg, "--revs-only")) {
 559                                 filter &= ~DO_NOREV;
 560                                 continue;
 561                         }
 562                         if (!strcmp(arg, "--no-revs")) {
 563                                 filter &= ~DO_REVS;
 564                                 continue;
 565                         }
 566                         if (!strcmp(arg, "--flags")) {
 567                                 filter &= ~DO_NONFLAGS;
 568                                 continue;
 569                         }
 570                         if (!strcmp(arg, "--no-flags")) {
 571                                 filter &= ~DO_FLAGS;
 572                                 continue;
 573                         }
 574                         if (!strcmp(arg, "--verify")) {
 575                                 filter &= ~(DO_FLAGS|DO_NOREV);
 576                                 verify = 1;
 577                                 continue;
 578                         }
 579                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 580                                 quiet = 1;
 581                                 continue;
 582                         }
 583                         if (!strcmp(arg, "--short") ||
 584                             !prefixcmp(arg, "--short=")) {
 585                                 filter &= ~(DO_FLAGS|DO_NOREV);
 586                                 verify = 1;
 587                                 abbrev = DEFAULT_ABBREV;
 588                                 if (arg[7] == '=')
 589                                         abbrev = strtoul(arg + 8, NULL, 10);
 590                                 if (abbrev < MINIMUM_ABBREV)
 591                                         abbrev = MINIMUM_ABBREV;
 592                                 else if (40 <= abbrev)
 593                                         abbrev = 40;
 594                                 continue;
 595                         }
 596                         if (!strcmp(arg, "--sq")) {
 597                                 output_sq = 1;
 598                                 continue;
 599                         }
 600                         if (!strcmp(arg, "--not")) {
 601                                 show_type ^= REVERSED;
 602                                 continue;
 603                         }
 604                         if (!strcmp(arg, "--symbolic")) {
 605                                 symbolic = SHOW_SYMBOLIC_ASIS;
 606                                 continue;
 607                         }
 608                         if (!strcmp(arg, "--symbolic-full-name")) {
 609                                 symbolic = SHOW_SYMBOLIC_FULL;
 610                                 continue;
 611                         }
 612                         if (!prefixcmp(arg, "--abbrev-ref") &&
 613                             (!arg[12] || arg[12] == '=')) {
 614                                 abbrev_ref = 1;
 615                                 abbrev_ref_strict = warn_ambiguous_refs;
 616                                 if (arg[12] == '=') {
 617                                         if (!strcmp(arg + 13, "strict"))
 618                                                 abbrev_ref_strict = 1;
 619                                         else if (!strcmp(arg + 13, "loose"))
 620                                                 abbrev_ref_strict = 0;
 621                                         else
 622                                                 die("unknown mode for %s", arg);
 623                                 }
 624                                 continue;
 625                         }
 626                         if (!strcmp(arg, "--all")) {
 627                                 for_each_ref(show_reference, NULL);
 628                                 continue;
 629                         }
 630                         if (!prefixcmp(arg, "--disambiguate=")) {
 631                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 632                                 continue;
 633                         }
 634                         if (!strcmp(arg, "--bisect")) {
 635                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 636                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 637                                 continue;
 638                         }
 639                         if (!prefixcmp(arg, "--branches=")) {
 640                                 for_each_glob_ref_in(show_reference, arg + 11,
 641                                         "refs/heads/", NULL);
 642                                 clear_ref_exclusion(&ref_excludes);
 643                                 continue;
 644                         }
 645                         if (!strcmp(arg, "--branches")) {
 646                                 for_each_branch_ref(show_reference, NULL);
 647                                 clear_ref_exclusion(&ref_excludes);
 648                                 continue;
 649                         }
 650                         if (!prefixcmp(arg, "--tags=")) {
 651                                 for_each_glob_ref_in(show_reference, arg + 7,
 652                                         "refs/tags/", NULL);
 653                                 clear_ref_exclusion(&ref_excludes);
 654                                 continue;
 655                         }
 656                         if (!strcmp(arg, "--tags")) {
 657                                 for_each_tag_ref(show_reference, NULL);
 658                                 clear_ref_exclusion(&ref_excludes);
 659                                 continue;
 660                         }
 661                         if (!prefixcmp(arg, "--glob=")) {
 662                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 663                                 clear_ref_exclusion(&ref_excludes);
 664                                 continue;
 665                         }
 666                         if (!prefixcmp(arg, "--remotes=")) {
 667                                 for_each_glob_ref_in(show_reference, arg + 10,
 668                                         "refs/remotes/", NULL);
 669                                 clear_ref_exclusion(&ref_excludes);
 670                                 continue;
 671                         }
 672                         if (!strcmp(arg, "--remotes")) {
 673                                 for_each_remote_ref(show_reference, NULL);
 674                                 clear_ref_exclusion(&ref_excludes);
 675                                 continue;
 676                         }
 677                         if (!prefixcmp(arg, "--exclude=")) {
 678                                 add_ref_exclusion(&ref_excludes, arg + 10);
 679                                 continue;
 680                         }
 681                         if (!strcmp(arg, "--show-toplevel")) {
 682                                 const char *work_tree = get_git_work_tree();
 683                                 if (work_tree)
 684                                         puts(work_tree);
 685                                 continue;
 686                         }
 687                         if (!strcmp(arg, "--show-prefix")) {
 688                                 if (prefix)
 689                                         puts(prefix);
 690                                 else
 691                                         putchar('\n');
 692                                 continue;
 693                         }
 694                         if (!strcmp(arg, "--show-cdup")) {
 695                                 const char *pfx = prefix;
 696                                 if (!is_inside_work_tree()) {
 697                                         const char *work_tree =
 698                                                 get_git_work_tree();
 699                                         if (work_tree)
 700                                                 printf("%s\n", work_tree);
 701                                         continue;
 702                                 }
 703                                 while (pfx) {
 704                                         pfx = strchr(pfx, '/');
 705                                         if (pfx) {
 706                                                 pfx++;
 707                                                 printf("../");
 708                                         }
 709                                 }
 710                                 putchar('\n');
 711                                 continue;
 712                         }
 713                         if (!strcmp(arg, "--git-dir")) {
 714                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 715                                 static char cwd[PATH_MAX];
 716                                 int len;
 717                                 if (gitdir) {
 718                                         puts(gitdir);
 719                                         continue;
 720                                 }
 721                                 if (!prefix) {
 722                                         puts(".git");
 723                                         continue;
 724                                 }
 725                                 if (!getcwd(cwd, PATH_MAX))
 726                                         die_errno("unable to get current working directory");
 727                                 len = strlen(cwd);
 728                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 729                                 continue;
 730                         }
 731                         if (!strcmp(arg, "--is-inside-git-dir")) {
 732                                 printf("%s\n", is_inside_git_dir() ? "true"
 733                                                 : "false");
 734                                 continue;
 735                         }
 736                         if (!strcmp(arg, "--is-inside-work-tree")) {
 737                                 printf("%s\n", is_inside_work_tree() ? "true"
 738                                                 : "false");
 739                                 continue;
 740                         }
 741                         if (!strcmp(arg, "--is-bare-repository")) {
 742                                 printf("%s\n", is_bare_repository() ? "true"
 743                                                 : "false");
 744                                 continue;
 745                         }
 746                         if (!prefixcmp(arg, "--since=")) {
 747                                 show_datestring("--max-age=", arg+8);
 748                                 continue;
 749                         }
 750                         if (!prefixcmp(arg, "--after=")) {
 751                                 show_datestring("--max-age=", arg+8);
 752                                 continue;
 753                         }
 754                         if (!prefixcmp(arg, "--before=")) {
 755                                 show_datestring("--min-age=", arg+9);
 756                                 continue;
 757                         }
 758                         if (!prefixcmp(arg, "--until=")) {
 759                                 show_datestring("--min-age=", arg+8);
 760                                 continue;
 761                         }
 762                         if (show_flag(arg) && verify)
 763                                 die_no_single_rev(quiet);
 764                         continue;
 765                 }
 766
 767                 /* Not a flag argument */
 768                 if (try_difference(arg))
 769                         continue;
 770                 if (try_parent_shorthands(arg))
 771                         continue;
 772                 name = arg;
 773                 type = NORMAL;
 774                 if (*arg == '^') {
 775                         name++;
 776                         type = REVERSED;
 777                 }
 778                 if (!get_sha1(name, sha1)) {
 779                         if (verify)
 780                                 revs_count++;
 781                         else
 782                                 show_rev(type, sha1, name);
 783                         continue;
 784                 }
 785                 if (verify)
 786                         die_no_single_rev(quiet);
 787                 as_is = 1;
 788                 if (!show_file(arg, output_prefix))
 789                         continue;
 790                 verify_filename(prefix, arg, 1);
 791         }
 792         if (verify) {
 793                 if (revs_count == 1) {
 794                         show_rev(type, sha1, name);
 795                         return 0;
 796                 } else if (revs_count == 0 && show_default())
 797                         return 0;
 798                 die_no_single_rev(quiet);
 799         } else
 800                 show_default();
 801         return 0;
 802 }