git.oblomov.eu Git - git/blob - builtin/rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "commit.h"
   8 #include "refs.h"
   9 #include "quote.h"
  10 #include "builtin.h"
  11 #include "parse-options.h"
  12 #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 parent_number;
 302         int include_rev = 0;
 303         int include_parents = 0;
 304         int exclude_parent = 0;
 305
 306         if ((dotdot = strstr(arg, "^!"))) {
 307                 include_rev = 1;
 308                 if (dotdot[2])
 309                         return 0;
 310         } else if ((dotdot = strstr(arg, "^@"))) {
 311                 include_parents = 1;
 312                 if (dotdot[2])
 313                         return 0;
 314         } else if ((dotdot = strstr(arg, "^-"))) {
 315                 include_rev = 1;
 316                 exclude_parent = 1;
 317
 318                 if (dotdot[2]) {
 319                         char *end;
 320                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 321                         if (*end != '\0' || !exclude_parent)
 322                                 return 0;
 323                 }
 324         } else
 325                 return 0;
 326
 327         *dotdot = 0;
 328         if (get_sha1_committish(arg, sha1)) {
 329                 *dotdot = '^';
 330                 return 0;
 331         }
 332
 333         commit = lookup_commit_reference(sha1);
 334         if (exclude_parent &&
 335             exclude_parent > commit_list_count(commit->parents)) {
 336                 *dotdot = '^';
 337                 return 0;
 338         }
 339
 340         if (include_rev)
 341                 show_rev(NORMAL, sha1, arg);
 342         for (parents = commit->parents, parent_number = 1;
 343              parents;
 344              parents = parents->next, parent_number++) {
 345                 char *name = NULL;
 346
 347                 if (exclude_parent && parent_number != exclude_parent)
 348                         continue;
 349
 350                 if (symbolic)
 351                         name = xstrfmt("%s^%d", arg, parent_number);
 352                 show_rev(include_parents ? NORMAL : REVERSED,
 353                          parents->item->object.oid.hash, name);
 354                 free(name);
 355         }
 356
 357         *dotdot = '^';
 358         return 1;
 359 }
 360
 361 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 362 {
 363         struct strbuf *parsed = o->value;
 364         if (unset)
 365                 strbuf_addf(parsed, " --no-%s", o->long_name);
 366         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 367                 strbuf_addf(parsed, " -%c", o->short_name);
 368         else
 369                 strbuf_addf(parsed, " --%s", o->long_name);
 370         if (arg) {
 371                 if (!stuck_long)
 372                         strbuf_addch(parsed, ' ');
 373                 else if (o->long_name)
 374                         strbuf_addch(parsed, '=');
 375                 sq_quote_buf(parsed, arg);
 376         }
 377         return 0;
 378 }
 379
 380 static const char *skipspaces(const char *s)
 381 {
 382         while (isspace(*s))
 383                 s++;
 384         return s;
 385 }
 386
 387 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 388 {
 389         static int keep_dashdash = 0, stop_at_non_option = 0;
 390         static char const * const parseopt_usage[] = {
 391                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 392                 NULL
 393         };
 394         static struct option parseopt_opts[] = {
 395                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 396                                         N_("keep the `--` passed as an arg")),
 397                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 398                                         N_("stop parsing after the "
 399                                            "first non-option argument")),
 400                 OPT_BOOL(0, "stuck-long", &stuck_long,
 401                                         N_("output in stuck long form")),
 402                 OPT_END(),
 403         };
 404         static const char * const flag_chars = "*=?!";
 405
 406         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 407         const char **usage = NULL;
 408         struct option *opts = NULL;
 409         int onb = 0, osz = 0, unb = 0, usz = 0;
 410
 411         strbuf_addstr(&parsed, "set --");
 412         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 413                              PARSE_OPT_KEEP_DASHDASH);
 414         if (argc < 1 || strcmp(argv[0], "--"))
 415                 usage_with_options(parseopt_usage, parseopt_opts);
 416
 417         /* get the usage up to the first line with a -- on it */
 418         for (;;) {
 419                 if (strbuf_getline(&sb, stdin) == EOF)
 420                         die("premature end of input");
 421                 ALLOC_GROW(usage, unb + 1, usz);
 422                 if (!strcmp("--", sb.buf)) {
 423                         if (unb < 1)
 424                                 die("no usage string given before the `--' separator");
 425                         usage[unb] = NULL;
 426                         break;
 427                 }
 428                 usage[unb++] = strbuf_detach(&sb, NULL);
 429         }
 430
 431         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 432         while (strbuf_getline(&sb, stdin) != EOF) {
 433                 const char *s;
 434                 const char *help;
 435                 struct option *o;
 436
 437                 if (!sb.len)
 438                         continue;
 439
 440                 ALLOC_GROW(opts, onb + 1, osz);
 441                 memset(opts + onb, 0, sizeof(opts[onb]));
 442
 443                 o = &opts[onb++];
 444                 help = strchr(sb.buf, ' ');
 445                 if (!help || *sb.buf == ' ') {
 446                         o->type = OPTION_GROUP;
 447                         o->help = xstrdup(skipspaces(sb.buf));
 448                         continue;
 449                 }
 450
 451                 o->type = OPTION_CALLBACK;
 452                 o->help = xstrdup(skipspaces(help));
 453                 o->value = &parsed;
 454                 o->flags = PARSE_OPT_NOARG;
 455                 o->callback = &parseopt_dump;
 456
 457                 /* name(s) */
 458                 s = strpbrk(sb.buf, flag_chars);
 459                 if (s == NULL)
 460                         s = help;
 461
 462                 if (s - sb.buf == 1) /* short option only */
 463                         o->short_name = *sb.buf;
 464                 else if (sb.buf[1] != ',') /* long option only */
 465                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 466                 else {
 467                         o->short_name = *sb.buf;
 468                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 469                 }
 470
 471                 /* flags */
 472                 while (s < help) {
 473                         switch (*s++) {
 474                         case '=':
 475                                 o->flags &= ~PARSE_OPT_NOARG;
 476                                 continue;
 477                         case '?':
 478                                 o->flags &= ~PARSE_OPT_NOARG;
 479                                 o->flags |= PARSE_OPT_OPTARG;
 480                                 continue;
 481                         case '!':
 482                                 o->flags |= PARSE_OPT_NONEG;
 483                                 continue;
 484                         case '*':
 485                                 o->flags |= PARSE_OPT_HIDDEN;
 486                                 continue;
 487                         }
 488                         s--;
 489                         break;
 490                 }
 491
 492                 if (s < help)
 493                         o->argh = xmemdupz(s, help - s);
 494         }
 495         strbuf_release(&sb);
 496
 497         /* put an OPT_END() */
 498         ALLOC_GROW(opts, onb + 1, osz);
 499         memset(opts + onb, 0, sizeof(opts[onb]));
 500         argc = parse_options(argc, argv, prefix, opts, usage,
 501                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 502                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 503                         PARSE_OPT_SHELL_EVAL);
 504
 505         strbuf_addstr(&parsed, " --");
 506         sq_quote_argv(&parsed, argv, 0);
 507         puts(parsed.buf);
 508         return 0;
 509 }
 510
 511 static int cmd_sq_quote(int argc, const char **argv)
 512 {
 513         struct strbuf buf = STRBUF_INIT;
 514
 515         if (argc)
 516                 sq_quote_argv(&buf, argv, 0);
 517         printf("%s\n", buf.buf);
 518         strbuf_release(&buf);
 519
 520         return 0;
 521 }
 522
 523 static void die_no_single_rev(int quiet)
 524 {
 525         if (quiet)
 526                 exit(1);
 527         else
 528                 die("Needed a single revision");
 529 }
 530
 531 static const char builtin_rev_parse_usage[] =
 532 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 533    "   or: git rev-parse --sq-quote [<arg>...]\n"
 534    "   or: git rev-parse [<options>] [<arg>...]\n"
 535    "\n"
 536    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 537
 538 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 539 {
 540         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 541         int did_repo_setup = 0;
 542         int has_dashdash = 0;
 543         int output_prefix = 0;
 544         unsigned char sha1[20];
 545         unsigned int flags = 0;
 546         const char *name = NULL;
 547         struct object_context unused;
 548         struct strbuf buf = STRBUF_INIT;
 549
 550         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 551                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 552
 553         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 554                 return cmd_sq_quote(argc - 2, argv + 2);
 555
 556         if (argc > 1 && !strcmp("-h", argv[1]))
 557                 usage(builtin_rev_parse_usage);
 558
 559         for (i = 1; i < argc; i++) {
 560                 if (!strcmp(argv[i], "--")) {
 561                         has_dashdash = 1;
 562                         break;
 563                 }
 564         }
 565
 566         /* No options; just report on whether we're in a git repo or not. */
 567         if (argc == 1) {
 568                 setup_git_directory();
 569                 git_config(git_default_config, NULL);
 570                 return 0;
 571         }
 572
 573         for (i = 1; i < argc; i++) {
 574                 const char *arg = argv[i];
 575
 576                 if (!strcmp(arg, "--local-env-vars")) {
 577                         int i;
 578                         for (i = 0; local_repo_env[i]; i++)
 579                                 printf("%s\n", local_repo_env[i]);
 580                         continue;
 581                 }
 582                 if (!strcmp(arg, "--resolve-git-dir")) {
 583                         const char *gitdir = argv[++i];
 584                         if (!gitdir)
 585                                 die("--resolve-git-dir requires an argument");
 586                         gitdir = resolve_gitdir(gitdir);
 587                         if (!gitdir)
 588                                 die("not a gitdir '%s'", argv[i]);
 589                         puts(gitdir);
 590                         continue;
 591                 }
 592
 593                 /* The rest of the options require a git repository. */
 594                 if (!did_repo_setup) {
 595                         prefix = setup_git_directory();
 596                         git_config(git_default_config, NULL);
 597                         did_repo_setup = 1;
 598                 }
 599
 600                 if (!strcmp(arg, "--git-path")) {
 601                         if (!argv[i + 1])
 602                                 die("--git-path requires an argument");
 603                         strbuf_reset(&buf);
 604                         puts(relative_path(git_path("%s", argv[i + 1]),
 605                                            prefix, &buf));
 606                         i++;
 607                         continue;
 608                 }
 609                 if (as_is) {
 610                         if (show_file(arg, output_prefix) && as_is < 2)
 611                                 verify_filename(prefix, arg, 0);
 612                         continue;
 613                 }
 614                 if (!strcmp(arg,"-n")) {
 615                         if (++i >= argc)
 616                                 die("-n requires an argument");
 617                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 618                                 show(arg);
 619                                 show(argv[i]);
 620                         }
 621                         continue;
 622                 }
 623                 if (starts_with(arg, "-n")) {
 624                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 625                                 show(arg);
 626                         continue;
 627                 }
 628
 629                 if (*arg == '-') {
 630                         if (!strcmp(arg, "--")) {
 631                                 as_is = 2;
 632                                 /* Pass on the "--" if we show anything but files.. */
 633                                 if (filter & (DO_FLAGS | DO_REVS))
 634                                         show_file(arg, 0);
 635                                 continue;
 636                         }
 637                         if (!strcmp(arg, "--default")) {
 638                                 def = argv[++i];
 639                                 if (!def)
 640                                         die("--default requires an argument");
 641                                 continue;
 642                         }
 643                         if (!strcmp(arg, "--prefix")) {
 644                                 prefix = argv[++i];
 645                                 if (!prefix)
 646                                         die("--prefix requires an argument");
 647                                 startup_info->prefix = prefix;
 648                                 output_prefix = 1;
 649                                 continue;
 650                         }
 651                         if (!strcmp(arg, "--revs-only")) {
 652                                 filter &= ~DO_NOREV;
 653                                 continue;
 654                         }
 655                         if (!strcmp(arg, "--no-revs")) {
 656                                 filter &= ~DO_REVS;
 657                                 continue;
 658                         }
 659                         if (!strcmp(arg, "--flags")) {
 660                                 filter &= ~DO_NONFLAGS;
 661                                 continue;
 662                         }
 663                         if (!strcmp(arg, "--no-flags")) {
 664                                 filter &= ~DO_FLAGS;
 665                                 continue;
 666                         }
 667                         if (!strcmp(arg, "--verify")) {
 668                                 filter &= ~(DO_FLAGS|DO_NOREV);
 669                                 verify = 1;
 670                                 continue;
 671                         }
 672                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 673                                 quiet = 1;
 674                                 flags |= GET_SHA1_QUIETLY;
 675                                 continue;
 676                         }
 677                         if (!strcmp(arg, "--short") ||
 678                             starts_with(arg, "--short=")) {
 679                                 filter &= ~(DO_FLAGS|DO_NOREV);
 680                                 verify = 1;
 681                                 abbrev = DEFAULT_ABBREV;
 682                                 if (!arg[7])
 683                                         continue;
 684                                 abbrev = strtoul(arg + 8, NULL, 10);
 685                                 if (abbrev < MINIMUM_ABBREV)
 686                                         abbrev = MINIMUM_ABBREV;
 687                                 else if (40 <= abbrev)
 688                                         abbrev = 40;
 689                                 continue;
 690                         }
 691                         if (!strcmp(arg, "--sq")) {
 692                                 output_sq = 1;
 693                                 continue;
 694                         }
 695                         if (!strcmp(arg, "--not")) {
 696                                 show_type ^= REVERSED;
 697                                 continue;
 698                         }
 699                         if (!strcmp(arg, "--symbolic")) {
 700                                 symbolic = SHOW_SYMBOLIC_ASIS;
 701                                 continue;
 702                         }
 703                         if (!strcmp(arg, "--symbolic-full-name")) {
 704                                 symbolic = SHOW_SYMBOLIC_FULL;
 705                                 continue;
 706                         }
 707                         if (starts_with(arg, "--abbrev-ref") &&
 708                             (!arg[12] || arg[12] == '=')) {
 709                                 abbrev_ref = 1;
 710                                 abbrev_ref_strict = warn_ambiguous_refs;
 711                                 if (arg[12] == '=') {
 712                                         if (!strcmp(arg + 13, "strict"))
 713                                                 abbrev_ref_strict = 1;
 714                                         else if (!strcmp(arg + 13, "loose"))
 715                                                 abbrev_ref_strict = 0;
 716                                         else
 717                                                 die("unknown mode for %s", arg);
 718                                 }
 719                                 continue;
 720                         }
 721                         if (!strcmp(arg, "--all")) {
 722                                 for_each_ref(show_reference, NULL);
 723                                 continue;
 724                         }
 725                         if (starts_with(arg, "--disambiguate=")) {
 726                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 727                                 continue;
 728                         }
 729                         if (!strcmp(arg, "--bisect")) {
 730                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 731                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 732                                 continue;
 733                         }
 734                         if (starts_with(arg, "--branches=")) {
 735                                 for_each_glob_ref_in(show_reference, arg + 11,
 736                                         "refs/heads/", NULL);
 737                                 clear_ref_exclusion(&ref_excludes);
 738                                 continue;
 739                         }
 740                         if (!strcmp(arg, "--branches")) {
 741                                 for_each_branch_ref(show_reference, NULL);
 742                                 clear_ref_exclusion(&ref_excludes);
 743                                 continue;
 744                         }
 745                         if (starts_with(arg, "--tags=")) {
 746                                 for_each_glob_ref_in(show_reference, arg + 7,
 747                                         "refs/tags/", NULL);
 748                                 clear_ref_exclusion(&ref_excludes);
 749                                 continue;
 750                         }
 751                         if (!strcmp(arg, "--tags")) {
 752                                 for_each_tag_ref(show_reference, NULL);
 753                                 clear_ref_exclusion(&ref_excludes);
 754                                 continue;
 755                         }
 756                         if (starts_with(arg, "--glob=")) {
 757                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 758                                 clear_ref_exclusion(&ref_excludes);
 759                                 continue;
 760                         }
 761                         if (starts_with(arg, "--remotes=")) {
 762                                 for_each_glob_ref_in(show_reference, arg + 10,
 763                                         "refs/remotes/", NULL);
 764                                 clear_ref_exclusion(&ref_excludes);
 765                                 continue;
 766                         }
 767                         if (!strcmp(arg, "--remotes")) {
 768                                 for_each_remote_ref(show_reference, NULL);
 769                                 clear_ref_exclusion(&ref_excludes);
 770                                 continue;
 771                         }
 772                         if (starts_with(arg, "--exclude=")) {
 773                                 add_ref_exclusion(&ref_excludes, arg + 10);
 774                                 continue;
 775                         }
 776                         if (!strcmp(arg, "--show-toplevel")) {
 777                                 const char *work_tree = get_git_work_tree();
 778                                 if (work_tree)
 779                                         puts(work_tree);
 780                                 continue;
 781                         }
 782                         if (!strcmp(arg, "--show-prefix")) {
 783                                 if (prefix)
 784                                         puts(prefix);
 785                                 else
 786                                         putchar('\n');
 787                                 continue;
 788                         }
 789                         if (!strcmp(arg, "--show-cdup")) {
 790                                 const char *pfx = prefix;
 791                                 if (!is_inside_work_tree()) {
 792                                         const char *work_tree =
 793                                                 get_git_work_tree();
 794                                         if (work_tree)
 795                                                 printf("%s\n", work_tree);
 796                                         continue;
 797                                 }
 798                                 while (pfx) {
 799                                         pfx = strchr(pfx, '/');
 800                                         if (pfx) {
 801                                                 pfx++;
 802                                                 printf("../");
 803                                         }
 804                                 }
 805                                 putchar('\n');
 806                                 continue;
 807                         }
 808                         if (!strcmp(arg, "--git-dir") ||
 809                             !strcmp(arg, "--absolute-git-dir")) {
 810                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 811                                 char *cwd;
 812                                 int len;
 813                                 if (arg[2] == 'g') {    /* --git-dir */
 814                                         if (gitdir) {
 815                                                 puts(gitdir);
 816                                                 continue;
 817                                         }
 818                                         if (!prefix) {
 819                                                 puts(".git");
 820                                                 continue;
 821                                         }
 822                                 } else {                /* --absolute-git-dir */
 823                                         if (!gitdir && !prefix)
 824                                                 gitdir = ".git";
 825                                         if (gitdir) {
 826                                                 puts(real_path(gitdir));
 827                                                 continue;
 828                                         }
 829                                 }
 830                                 cwd = xgetcwd();
 831                                 len = strlen(cwd);
 832                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 833                                 free(cwd);
 834                                 continue;
 835                         }
 836                         if (!strcmp(arg, "--git-common-dir")) {
 837                                 strbuf_reset(&buf);
 838                                 puts(relative_path(get_git_common_dir(),
 839                                                    prefix, &buf));
 840                                 continue;
 841                         }
 842                         if (!strcmp(arg, "--is-inside-git-dir")) {
 843                                 printf("%s\n", is_inside_git_dir() ? "true"
 844                                                 : "false");
 845                                 continue;
 846                         }
 847                         if (!strcmp(arg, "--is-inside-work-tree")) {
 848                                 printf("%s\n", is_inside_work_tree() ? "true"
 849                                                 : "false");
 850                                 continue;
 851                         }
 852                         if (!strcmp(arg, "--is-bare-repository")) {
 853                                 printf("%s\n", is_bare_repository() ? "true"
 854                                                 : "false");
 855                                 continue;
 856                         }
 857                         if (!strcmp(arg, "--shared-index-path")) {
 858                                 if (read_cache() < 0)
 859                                         die(_("Could not read the index"));
 860                                 if (the_index.split_index) {
 861                                         const unsigned char *sha1 = the_index.split_index->base_sha1;
 862                                         const char *path = git_path("sharedindex.%s", sha1_to_hex(sha1));
 863                                         strbuf_reset(&buf);
 864                                         puts(relative_path(path, prefix, &buf));
 865                                 }
 866                                 continue;
 867                         }
 868                         if (starts_with(arg, "--since=")) {
 869                                 show_datestring("--max-age=", arg+8);
 870                                 continue;
 871                         }
 872                         if (starts_with(arg, "--after=")) {
 873                                 show_datestring("--max-age=", arg+8);
 874                                 continue;
 875                         }
 876                         if (starts_with(arg, "--before=")) {
 877                                 show_datestring("--min-age=", arg+9);
 878                                 continue;
 879                         }
 880                         if (starts_with(arg, "--until=")) {
 881                                 show_datestring("--min-age=", arg+8);
 882                                 continue;
 883                         }
 884                         if (show_flag(arg) && verify)
 885                                 die_no_single_rev(quiet);
 886                         continue;
 887                 }
 888
 889                 /* Not a flag argument */
 890                 if (try_difference(arg))
 891                         continue;
 892                 if (try_parent_shorthands(arg))
 893                         continue;
 894                 name = arg;
 895                 type = NORMAL;
 896                 if (*arg == '^') {
 897                         name++;
 898                         type = REVERSED;
 899                 }
 900                 if (!get_sha1_with_context(name, flags, sha1, &unused)) {
 901                         if (verify)
 902                                 revs_count++;
 903                         else
 904                                 show_rev(type, sha1, name);
 905                         continue;
 906                 }
 907                 if (verify)
 908                         die_no_single_rev(quiet);
 909                 if (has_dashdash)
 910                         die("bad revision '%s'", arg);
 911                 as_is = 1;
 912                 if (!show_file(arg, output_prefix))
 913                         continue;
 914                 verify_filename(prefix, arg, 1);
 915         }
 916         strbuf_release(&buf);
 917         if (verify) {
 918                 if (revs_count == 1) {
 919                         show_rev(type, sha1, name);
 920                         return 0;
 921                 } else if (revs_count == 0 && show_default())
 922                         return 0;
 923                 die_no_single_rev(quiet);
 924         } else
 925                 show_default();
 926         return 0;
 927 }