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 #include "split-index.h"
  15
  16 #define DO_REVS         1
  17 #define DO_NOREV        2
  18 #define DO_FLAGS        4
  19 #define DO_NONFLAGS     8
  20 static int filter = ~0;
  21
  22 static const char *def;
  23
  24 #define NORMAL 0
  25 #define REVERSED 1
  26 static int show_type = NORMAL;
  27
  28 #define SHOW_SYMBOLIC_ASIS 1
  29 #define SHOW_SYMBOLIC_FULL 2
  30 static int symbolic;
  31 static int abbrev;
  32 static int abbrev_ref;
  33 static int abbrev_ref_strict;
  34 static int output_sq;
  35
  36 static int stuck_long;
  37 static struct string_list *ref_excludes;
  38
  39 /*
  40  * Some arguments are relevant "revision" arguments,
  41  * others are about output format or other details.
  42  * This sorts it all out.
  43  */
  44 static int is_rev_argument(const char *arg)
  45 {
  46         static const char *rev_args[] = {
  47                 "--all",
  48                 "--bisect",
  49                 "--dense",
  50                 "--branches=",
  51                 "--branches",
  52                 "--header",
  53                 "--ignore-missing",
  54                 "--max-age=",
  55                 "--max-count=",
  56                 "--min-age=",
  57                 "--no-merges",
  58                 "--min-parents=",
  59                 "--no-min-parents",
  60                 "--max-parents=",
  61                 "--no-max-parents",
  62                 "--objects",
  63                 "--objects-edge",
  64                 "--parents",
  65                 "--pretty",
  66                 "--remotes=",
  67                 "--remotes",
  68                 "--glob=",
  69                 "--sparse",
  70                 "--tags=",
  71                 "--tags",
  72                 "--topo-order",
  73                 "--date-order",
  74                 "--unpacked",
  75                 NULL
  76         };
  77         const char **p = rev_args;
  78
  79         /* accept -<digit>, like traditional "head" */
  80         if ((*arg == '-') && isdigit(arg[1]))
  81                 return 1;
  82
  83         for (;;) {
  84                 const char *str = *p++;
  85                 int len;
  86                 if (!str)
  87                         return 0;
  88                 len = strlen(str);
  89                 if (!strcmp(arg, str) ||
  90                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  91                         return 1;
  92         }
  93 }
  94
  95 /* Output argument as a string, either SQ or normal */
  96 static void show(const char *arg)
  97 {
  98         if (output_sq) {
  99                 int sq = '\'', ch;
 100
 101                 putchar(sq);
 102                 while ((ch = *arg++)) {
 103                         if (ch == sq)
 104                                 fputs("'\\'", stdout);
 105                         putchar(ch);
 106                 }
 107                 putchar(sq);
 108                 putchar(' ');
 109         }
 110         else
 111                 puts(arg);
 112 }
 113
 114 /* Like show(), but with a negation prefix according to type */
 115 static void show_with_type(int type, const char *arg)
 116 {
 117         if (type != show_type)
 118                 putchar('^');
 119         show(arg);
 120 }
 121
 122 /* Output a revision, only if filter allows it */
 123 static void show_rev(int type, const unsigned char *sha1, const char *name)
 124 {
 125         if (!(filter & DO_REVS))
 126                 return;
 127         def = NULL;
 128
 129         if ((symbolic || abbrev_ref) && name) {
 130                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 131                         unsigned char discard[20];
 132                         char *full;
 133
 134                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 135                         case 0:
 136                                 /*
 137                                  * Not found -- not a ref.  We could
 138                                  * emit "name" here, but symbolic-full
 139                                  * users are interested in finding the
 140                                  * refs spelled in full, and they would
 141                                  * need to filter non-refs if we did so.
 142                                  */
 143                                 break;
 144                         case 1: /* happy */
 145                                 if (abbrev_ref)
 146                                         full = shorten_unambiguous_ref(full,
 147                                                 abbrev_ref_strict);
 148                                 show_with_type(type, full);
 149                                 break;
 150                         default: /* ambiguous */
 151                                 error("refname '%s' is ambiguous", name);
 152                                 break;
 153                         }
 154                         free(full);
 155                 } else {
 156                         show_with_type(type, name);
 157                 }
 158         }
 159         else if (abbrev)
 160                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 161         else
 162                 show_with_type(type, sha1_to_hex(sha1));
 163 }
 164
 165 /* Output a flag, only if filter allows it. */
 166 static int show_flag(const char *arg)
 167 {
 168         if (!(filter & DO_FLAGS))
 169                 return 0;
 170         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 171                 show(arg);
 172                 return 1;
 173         }
 174         return 0;
 175 }
 176
 177 static int show_default(void)
 178 {
 179         const char *s = def;
 180
 181         if (s) {
 182                 unsigned char sha1[20];
 183
 184                 def = NULL;
 185                 if (!get_sha1(s, sha1)) {
 186                         show_rev(NORMAL, sha1, s);
 187                         return 1;
 188                 }
 189         }
 190         return 0;
 191 }
 192
 193 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 194 {
 195         if (ref_excluded(ref_excludes, refname))
 196                 return 0;
 197         show_rev(NORMAL, oid->hash, refname);
 198         return 0;
 199 }
 200
 201 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 202 {
 203         show_rev(REVERSED, oid->hash, refname);
 204         return 0;
 205 }
 206
 207 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 208 {
 209         show_rev(NORMAL, sha1, NULL);
 210         return 0;
 211 }
 212
 213 static void show_datestring(const char *flag, const char *datestr)
 214 {
 215         static char buffer[100];
 216
 217         /* date handling requires both flags and revs */
 218         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 219                 return;
 220         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 221         show(buffer);
 222 }
 223
 224 static int show_file(const char *arg, int output_prefix)
 225 {
 226         show_default();
 227         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 228                 if (output_prefix) {
 229                         const char *prefix = startup_info->prefix;
 230                         show(prefix_filename(prefix,
 231                                              prefix ? strlen(prefix) : 0,
 232                                              arg));
 233                 } else
 234                         show(arg);
 235                 return 1;
 236         }
 237         return 0;
 238 }
 239
 240 static int try_difference(const char *arg)
 241 {
 242         char *dotdot;
 243         unsigned char sha1[20];
 244         unsigned char end[20];
 245         const char *next;
 246         const char *this;
 247         int symmetric;
 248         static const char head_by_default[] = "HEAD";
 249
 250         if (!(dotdot = strstr(arg, "..")))
 251                 return 0;
 252         next = dotdot + 2;
 253         this = arg;
 254         symmetric = (*next == '.');
 255
 256         *dotdot = 0;
 257         next += symmetric;
 258
 259         if (!*next)
 260                 next = head_by_default;
 261         if (dotdot == arg)
 262                 this = head_by_default;
 263
 264         if (this == head_by_default && next == head_by_default &&
 265             !symmetric) {
 266                 /*
 267                  * Just ".."?  That is not a range but the
 268                  * pathspec for the parent directory.
 269                  */
 270                 *dotdot = '.';
 271                 return 0;
 272         }
 273
 274         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 275                 show_rev(NORMAL, end, next);
 276                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 277                 if (symmetric) {
 278                         struct commit_list *exclude;
 279                         struct commit *a, *b;
 280                         a = lookup_commit_reference(sha1);
 281                         b = lookup_commit_reference(end);
 282                         exclude = get_merge_bases(a, b);
 283                         while (exclude) {
 284                                 struct commit *commit = pop_commit(&exclude);
 285                                 show_rev(REVERSED, commit->object.oid.hash, NULL);
 286                         }
 287                 }
 288                 *dotdot = '.';
 289                 return 1;
 290         }
 291         *dotdot = '.';
 292         return 0;
 293 }
 294
 295 static int try_parent_shorthands(const char *arg)
 296 {
 297         char *dotdot;
 298         unsigned char sha1[20];
 299         struct commit *commit;
 300         struct commit_list *parents;
 301         int parents_only;
 302
 303         if ((dotdot = strstr(arg, "^!")))
 304                 parents_only = 0;
 305         else if ((dotdot = strstr(arg, "^@")))
 306                 parents_only = 1;
 307
 308         if (!dotdot || dotdot[2])
 309                 return 0;
 310
 311         *dotdot = 0;
 312         if (get_sha1_committish(arg, sha1)) {
 313                 *dotdot = '^';
 314                 return 0;
 315         }
 316
 317         if (!parents_only)
 318                 show_rev(NORMAL, sha1, arg);
 319         commit = lookup_commit_reference(sha1);
 320         for (parents = commit->parents; parents; parents = parents->next)
 321                 show_rev(parents_only ? NORMAL : REVERSED,
 322                                 parents->item->object.oid.hash, arg);
 323
 324         *dotdot = '^';
 325         return 1;
 326 }
 327
 328 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 329 {
 330         struct strbuf *parsed = o->value;
 331         if (unset)
 332                 strbuf_addf(parsed, " --no-%s", o->long_name);
 333         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 334                 strbuf_addf(parsed, " -%c", o->short_name);
 335         else
 336                 strbuf_addf(parsed, " --%s", o->long_name);
 337         if (arg) {
 338                 if (!stuck_long)
 339                         strbuf_addch(parsed, ' ');
 340                 else if (o->long_name)
 341                         strbuf_addch(parsed, '=');
 342                 sq_quote_buf(parsed, arg);
 343         }
 344         return 0;
 345 }
 346
 347 static const char *skipspaces(const char *s)
 348 {
 349         while (isspace(*s))
 350                 s++;
 351         return s;
 352 }
 353
 354 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 355 {
 356         static int keep_dashdash = 0, stop_at_non_option = 0;
 357         static char const * const parseopt_usage[] = {
 358                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 359                 NULL
 360         };
 361         static struct option parseopt_opts[] = {
 362                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 363                                         N_("keep the `--` passed as an arg")),
 364                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 365                                         N_("stop parsing after the "
 366                                            "first non-option argument")),
 367                 OPT_BOOL(0, "stuck-long", &stuck_long,
 368                                         N_("output in stuck long form")),
 369                 OPT_END(),
 370         };
 371         static const char * const flag_chars = "*=?!";
 372
 373         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 374         const char **usage = NULL;
 375         struct option *opts = NULL;
 376         int onb = 0, osz = 0, unb = 0, usz = 0;
 377
 378         strbuf_addstr(&parsed, "set --");
 379         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 380                              PARSE_OPT_KEEP_DASHDASH);
 381         if (argc < 1 || strcmp(argv[0], "--"))
 382                 usage_with_options(parseopt_usage, parseopt_opts);
 383
 384         /* get the usage up to the first line with a -- on it */
 385         for (;;) {
 386                 if (strbuf_getline(&sb, stdin) == EOF)
 387                         die("premature end of input");
 388                 ALLOC_GROW(usage, unb + 1, usz);
 389                 if (!strcmp("--", sb.buf)) {
 390                         if (unb < 1)
 391                                 die("no usage string given before the `--' separator");
 392                         usage[unb] = NULL;
 393                         break;
 394                 }
 395                 usage[unb++] = strbuf_detach(&sb, NULL);
 396         }
 397
 398         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 399         while (strbuf_getline(&sb, stdin) != EOF) {
 400                 const char *s;
 401                 const char *help;
 402                 struct option *o;
 403
 404                 if (!sb.len)
 405                         continue;
 406
 407                 ALLOC_GROW(opts, onb + 1, osz);
 408                 memset(opts + onb, 0, sizeof(opts[onb]));
 409
 410                 o = &opts[onb++];
 411                 help = strchr(sb.buf, ' ');
 412                 if (!help || *sb.buf == ' ') {
 413                         o->type = OPTION_GROUP;
 414                         o->help = xstrdup(skipspaces(sb.buf));
 415                         continue;
 416                 }
 417
 418                 o->type = OPTION_CALLBACK;
 419                 o->help = xstrdup(skipspaces(help));
 420                 o->value = &parsed;
 421                 o->flags = PARSE_OPT_NOARG;
 422                 o->callback = &parseopt_dump;
 423
 424                 /* name(s) */
 425                 s = strpbrk(sb.buf, flag_chars);
 426                 if (s == NULL)
 427                         s = help;
 428
 429                 if (s - sb.buf == 1) /* short option only */
 430                         o->short_name = *sb.buf;
 431                 else if (sb.buf[1] != ',') /* long option only */
 432                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 433                 else {
 434                         o->short_name = *sb.buf;
 435                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 436                 }
 437
 438                 /* flags */
 439                 while (s < help) {
 440                         switch (*s++) {
 441                         case '=':
 442                                 o->flags &= ~PARSE_OPT_NOARG;
 443                                 continue;
 444                         case '?':
 445                                 o->flags &= ~PARSE_OPT_NOARG;
 446                                 o->flags |= PARSE_OPT_OPTARG;
 447                                 continue;
 448                         case '!':
 449                                 o->flags |= PARSE_OPT_NONEG;
 450                                 continue;
 451                         case '*':
 452                                 o->flags |= PARSE_OPT_HIDDEN;
 453                                 continue;
 454                         }
 455                         s--;
 456                         break;
 457                 }
 458
 459                 if (s < help)
 460                         o->argh = xmemdupz(s, help - s);
 461         }
 462         strbuf_release(&sb);
 463
 464         /* put an OPT_END() */
 465         ALLOC_GROW(opts, onb + 1, osz);
 466         memset(opts + onb, 0, sizeof(opts[onb]));
 467         argc = parse_options(argc, argv, prefix, opts, usage,
 468                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 469                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 470                         PARSE_OPT_SHELL_EVAL);
 471
 472         strbuf_addf(&parsed, " --");
 473         sq_quote_argv(&parsed, argv, 0);
 474         puts(parsed.buf);
 475         return 0;
 476 }
 477
 478 static int cmd_sq_quote(int argc, const char **argv)
 479 {
 480         struct strbuf buf = STRBUF_INIT;
 481
 482         if (argc)
 483                 sq_quote_argv(&buf, argv, 0);
 484         printf("%s\n", buf.buf);
 485         strbuf_release(&buf);
 486
 487         return 0;
 488 }
 489
 490 static void die_no_single_rev(int quiet)
 491 {
 492         if (quiet)
 493                 exit(1);
 494         else
 495                 die("Needed a single revision");
 496 }
 497
 498 static const char builtin_rev_parse_usage[] =
 499 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 500    "   or: git rev-parse --sq-quote [<arg>...]\n"
 501    "   or: git rev-parse [<options>] [<arg>...]\n"
 502    "\n"
 503    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 504
 505 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 506 {
 507         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 508         int did_repo_setup = 0;
 509         int has_dashdash = 0;
 510         int output_prefix = 0;
 511         unsigned char sha1[20];
 512         unsigned int flags = 0;
 513         const char *name = NULL;
 514         struct object_context unused;
 515
 516         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 517                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 518
 519         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 520                 return cmd_sq_quote(argc - 2, argv + 2);
 521
 522         if (argc > 1 && !strcmp("-h", argv[1]))
 523                 usage(builtin_rev_parse_usage);
 524
 525         for (i = 1; i < argc; i++) {
 526                 if (!strcmp(argv[i], "--")) {
 527                         has_dashdash = 1;
 528                         break;
 529                 }
 530         }
 531
 532         /* No options; just report on whether we're in a git repo or not. */
 533         if (argc == 1) {
 534                 setup_git_directory();
 535                 git_config(git_default_config, NULL);
 536                 return 0;
 537         }
 538
 539         for (i = 1; i < argc; i++) {
 540                 const char *arg = argv[i];
 541
 542                 if (!strcmp(arg, "--local-env-vars")) {
 543                         int i;
 544                         for (i = 0; local_repo_env[i]; i++)
 545                                 printf("%s\n", local_repo_env[i]);
 546                         continue;
 547                 }
 548                 if (!strcmp(arg, "--resolve-git-dir")) {
 549                         const char *gitdir = argv[++i];
 550                         if (!gitdir)
 551                                 die("--resolve-git-dir requires an argument");
 552                         gitdir = resolve_gitdir(gitdir);
 553                         if (!gitdir)
 554                                 die("not a gitdir '%s'", argv[i]);
 555                         puts(gitdir);
 556                         continue;
 557                 }
 558
 559                 /* The rest of the options require a git repository. */
 560                 if (!did_repo_setup) {
 561                         prefix = setup_git_directory();
 562                         git_config(git_default_config, NULL);
 563                         did_repo_setup = 1;
 564                 }
 565
 566                 if (!strcmp(arg, "--git-path")) {
 567                         if (!argv[i + 1])
 568                                 die("--git-path requires an argument");
 569                         puts(git_path("%s", argv[i + 1]));
 570                         i++;
 571                         continue;
 572                 }
 573                 if (as_is) {
 574                         if (show_file(arg, output_prefix) && as_is < 2)
 575                                 verify_filename(prefix, arg, 0);
 576                         continue;
 577                 }
 578                 if (!strcmp(arg,"-n")) {
 579                         if (++i >= argc)
 580                                 die("-n requires an argument");
 581                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 582                                 show(arg);
 583                                 show(argv[i]);
 584                         }
 585                         continue;
 586                 }
 587                 if (starts_with(arg, "-n")) {
 588                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 589                                 show(arg);
 590                         continue;
 591                 }
 592
 593                 if (*arg == '-') {
 594                         if (!strcmp(arg, "--")) {
 595                                 as_is = 2;
 596                                 /* Pass on the "--" if we show anything but files.. */
 597                                 if (filter & (DO_FLAGS | DO_REVS))
 598                                         show_file(arg, 0);
 599                                 continue;
 600                         }
 601                         if (!strcmp(arg, "--default")) {
 602                                 def = argv[++i];
 603                                 if (!def)
 604                                         die("--default requires an argument");
 605                                 continue;
 606                         }
 607                         if (!strcmp(arg, "--prefix")) {
 608                                 prefix = argv[++i];
 609                                 if (!prefix)
 610                                         die("--prefix requires an argument");
 611                                 startup_info->prefix = prefix;
 612                                 output_prefix = 1;
 613                                 continue;
 614                         }
 615                         if (!strcmp(arg, "--revs-only")) {
 616                                 filter &= ~DO_NOREV;
 617                                 continue;
 618                         }
 619                         if (!strcmp(arg, "--no-revs")) {
 620                                 filter &= ~DO_REVS;
 621                                 continue;
 622                         }
 623                         if (!strcmp(arg, "--flags")) {
 624                                 filter &= ~DO_NONFLAGS;
 625                                 continue;
 626                         }
 627                         if (!strcmp(arg, "--no-flags")) {
 628                                 filter &= ~DO_FLAGS;
 629                                 continue;
 630                         }
 631                         if (!strcmp(arg, "--verify")) {
 632                                 filter &= ~(DO_FLAGS|DO_NOREV);
 633                                 verify = 1;
 634                                 continue;
 635                         }
 636                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 637                                 quiet = 1;
 638                                 flags |= GET_SHA1_QUIETLY;
 639                                 continue;
 640                         }
 641                         if (!strcmp(arg, "--short") ||
 642                             starts_with(arg, "--short=")) {
 643                                 filter &= ~(DO_FLAGS|DO_NOREV);
 644                                 verify = 1;
 645                                 abbrev = DEFAULT_ABBREV;
 646                                 if (arg[7] == '=')
 647                                         abbrev = strtoul(arg + 8, NULL, 10);
 648                                 if (abbrev < MINIMUM_ABBREV)
 649                                         abbrev = MINIMUM_ABBREV;
 650                                 else if (40 <= abbrev)
 651                                         abbrev = 40;
 652                                 continue;
 653                         }
 654                         if (!strcmp(arg, "--sq")) {
 655                                 output_sq = 1;
 656                                 continue;
 657                         }
 658                         if (!strcmp(arg, "--not")) {
 659                                 show_type ^= REVERSED;
 660                                 continue;
 661                         }
 662                         if (!strcmp(arg, "--symbolic")) {
 663                                 symbolic = SHOW_SYMBOLIC_ASIS;
 664                                 continue;
 665                         }
 666                         if (!strcmp(arg, "--symbolic-full-name")) {
 667                                 symbolic = SHOW_SYMBOLIC_FULL;
 668                                 continue;
 669                         }
 670                         if (starts_with(arg, "--abbrev-ref") &&
 671                             (!arg[12] || arg[12] == '=')) {
 672                                 abbrev_ref = 1;
 673                                 abbrev_ref_strict = warn_ambiguous_refs;
 674                                 if (arg[12] == '=') {
 675                                         if (!strcmp(arg + 13, "strict"))
 676                                                 abbrev_ref_strict = 1;
 677                                         else if (!strcmp(arg + 13, "loose"))
 678                                                 abbrev_ref_strict = 0;
 679                                         else
 680                                                 die("unknown mode for %s", arg);
 681                                 }
 682                                 continue;
 683                         }
 684                         if (!strcmp(arg, "--all")) {
 685                                 for_each_ref(show_reference, NULL);
 686                                 continue;
 687                         }
 688                         if (starts_with(arg, "--disambiguate=")) {
 689                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 690                                 continue;
 691                         }
 692                         if (!strcmp(arg, "--bisect")) {
 693                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 694                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 695                                 continue;
 696                         }
 697                         if (starts_with(arg, "--branches=")) {
 698                                 for_each_glob_ref_in(show_reference, arg + 11,
 699                                         "refs/heads/", NULL);
 700                                 clear_ref_exclusion(&ref_excludes);
 701                                 continue;
 702                         }
 703                         if (!strcmp(arg, "--branches")) {
 704                                 for_each_branch_ref(show_reference, NULL);
 705                                 clear_ref_exclusion(&ref_excludes);
 706                                 continue;
 707                         }
 708                         if (starts_with(arg, "--tags=")) {
 709                                 for_each_glob_ref_in(show_reference, arg + 7,
 710                                         "refs/tags/", NULL);
 711                                 clear_ref_exclusion(&ref_excludes);
 712                                 continue;
 713                         }
 714                         if (!strcmp(arg, "--tags")) {
 715                                 for_each_tag_ref(show_reference, NULL);
 716                                 clear_ref_exclusion(&ref_excludes);
 717                                 continue;
 718                         }
 719                         if (starts_with(arg, "--glob=")) {
 720                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 721                                 clear_ref_exclusion(&ref_excludes);
 722                                 continue;
 723                         }
 724                         if (starts_with(arg, "--remotes=")) {
 725                                 for_each_glob_ref_in(show_reference, arg + 10,
 726                                         "refs/remotes/", NULL);
 727                                 clear_ref_exclusion(&ref_excludes);
 728                                 continue;
 729                         }
 730                         if (!strcmp(arg, "--remotes")) {
 731                                 for_each_remote_ref(show_reference, NULL);
 732                                 clear_ref_exclusion(&ref_excludes);
 733                                 continue;
 734                         }
 735                         if (starts_with(arg, "--exclude=")) {
 736                                 add_ref_exclusion(&ref_excludes, arg + 10);
 737                                 continue;
 738                         }
 739                         if (!strcmp(arg, "--show-toplevel")) {
 740                                 const char *work_tree = get_git_work_tree();
 741                                 if (work_tree)
 742                                         puts(work_tree);
 743                                 continue;
 744                         }
 745                         if (!strcmp(arg, "--show-prefix")) {
 746                                 if (prefix)
 747                                         puts(prefix);
 748                                 else
 749                                         putchar('\n');
 750                                 continue;
 751                         }
 752                         if (!strcmp(arg, "--show-cdup")) {
 753                                 const char *pfx = prefix;
 754                                 if (!is_inside_work_tree()) {
 755                                         const char *work_tree =
 756                                                 get_git_work_tree();
 757                                         if (work_tree)
 758                                                 printf("%s\n", work_tree);
 759                                         continue;
 760                                 }
 761                                 while (pfx) {
 762                                         pfx = strchr(pfx, '/');
 763                                         if (pfx) {
 764                                                 pfx++;
 765                                                 printf("../");
 766                                         }
 767                                 }
 768                                 putchar('\n');
 769                                 continue;
 770                         }
 771                         if (!strcmp(arg, "--git-dir")) {
 772                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 773                                 char *cwd;
 774                                 int len;
 775                                 if (gitdir) {
 776                                         puts(gitdir);
 777                                         continue;
 778                                 }
 779                                 if (!prefix) {
 780                                         puts(".git");
 781                                         continue;
 782                                 }
 783                                 cwd = xgetcwd();
 784                                 len = strlen(cwd);
 785                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 786                                 free(cwd);
 787                                 continue;
 788                         }
 789                         if (!strcmp(arg, "--git-common-dir")) {
 790                                 const char *pfx = prefix ? prefix : "";
 791                                 puts(prefix_filename(pfx, strlen(pfx), get_git_common_dir()));
 792                                 continue;
 793                         }
 794                         if (!strcmp(arg, "--is-inside-git-dir")) {
 795                                 printf("%s\n", is_inside_git_dir() ? "true"
 796                                                 : "false");
 797                                 continue;
 798                         }
 799                         if (!strcmp(arg, "--is-inside-work-tree")) {
 800                                 printf("%s\n", is_inside_work_tree() ? "true"
 801                                                 : "false");
 802                                 continue;
 803                         }
 804                         if (!strcmp(arg, "--is-bare-repository")) {
 805                                 printf("%s\n", is_bare_repository() ? "true"
 806                                                 : "false");
 807                                 continue;
 808                         }
 809                         if (!strcmp(arg, "--shared-index-path")) {
 810                                 if (read_cache() < 0)
 811                                         die(_("Could not read the index"));
 812                                 if (the_index.split_index) {
 813                                         const unsigned char *sha1 = the_index.split_index->base_sha1;
 814                                         puts(git_path("sharedindex.%s", sha1_to_hex(sha1)));
 815                                 }
 816                                 continue;
 817                         }
 818                         if (starts_with(arg, "--since=")) {
 819                                 show_datestring("--max-age=", arg+8);
 820                                 continue;
 821                         }
 822                         if (starts_with(arg, "--after=")) {
 823                                 show_datestring("--max-age=", arg+8);
 824                                 continue;
 825                         }
 826                         if (starts_with(arg, "--before=")) {
 827                                 show_datestring("--min-age=", arg+9);
 828                                 continue;
 829                         }
 830                         if (starts_with(arg, "--until=")) {
 831                                 show_datestring("--min-age=", arg+8);
 832                                 continue;
 833                         }
 834                         if (show_flag(arg) && verify)
 835                                 die_no_single_rev(quiet);
 836                         continue;
 837                 }
 838
 839                 /* Not a flag argument */
 840                 if (try_difference(arg))
 841                         continue;
 842                 if (try_parent_shorthands(arg))
 843                         continue;
 844                 name = arg;
 845                 type = NORMAL;
 846                 if (*arg == '^') {
 847                         name++;
 848                         type = REVERSED;
 849                 }
 850                 if (!get_sha1_with_context(name, flags, sha1, &unused)) {
 851                         if (verify)
 852                                 revs_count++;
 853                         else
 854                                 show_rev(type, sha1, name);
 855                         continue;
 856                 }
 857                 if (verify)
 858                         die_no_single_rev(quiet);
 859                 if (has_dashdash)
 860                         die("bad revision '%s'", arg);
 861                 as_is = 1;
 862                 if (!show_file(arg, output_prefix))
 863                         continue;
 864                 verify_filename(prefix, arg, 1);
 865         }
 866         if (verify) {
 867                 if (revs_count == 1) {
 868                         show_rev(type, sha1, name);
 869                         return 0;
 870                 } else if (revs_count == 0 && show_default())
 871                         return 0;
 872                 die_no_single_rev(quiet);
 873         } else
 874                 show_default();
 875         return 0;
 876 }