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 #include "submodule.h"
  16
  17 #define DO_REVS         1
  18 #define DO_NOREV        2
  19 #define DO_FLAGS        4
  20 #define DO_NONFLAGS     8
  21 static int filter = ~0;
  22
  23 static const char *def;
  24
  25 #define NORMAL 0
  26 #define REVERSED 1
  27 static int show_type = NORMAL;
  28
  29 #define SHOW_SYMBOLIC_ASIS 1
  30 #define SHOW_SYMBOLIC_FULL 2
  31 static int symbolic;
  32 static int abbrev;
  33 static int abbrev_ref;
  34 static int abbrev_ref_strict;
  35 static int output_sq;
  36
  37 static int stuck_long;
  38 static struct string_list *ref_excludes;
  39
  40 /*
  41  * Some arguments are relevant "revision" arguments,
  42  * others are about output format or other details.
  43  * This sorts it all out.
  44  */
  45 static int is_rev_argument(const char *arg)
  46 {
  47         static const char *rev_args[] = {
  48                 "--all",
  49                 "--bisect",
  50                 "--dense",
  51                 "--branches=",
  52                 "--branches",
  53                 "--header",
  54                 "--ignore-missing",
  55                 "--max-age=",
  56                 "--max-count=",
  57                 "--min-age=",
  58                 "--no-merges",
  59                 "--min-parents=",
  60                 "--no-min-parents",
  61                 "--max-parents=",
  62                 "--no-max-parents",
  63                 "--objects",
  64                 "--objects-edge",
  65                 "--parents",
  66                 "--pretty",
  67                 "--remotes=",
  68                 "--remotes",
  69                 "--glob=",
  70                 "--sparse",
  71                 "--tags=",
  72                 "--tags",
  73                 "--topo-order",
  74                 "--date-order",
  75                 "--unpacked",
  76                 NULL
  77         };
  78         const char **p = rev_args;
  79
  80         /* accept -<digit>, like traditional "head" */
  81         if ((*arg == '-') && isdigit(arg[1]))
  82                 return 1;
  83
  84         for (;;) {
  85                 const char *str = *p++;
  86                 int len;
  87                 if (!str)
  88                         return 0;
  89                 len = strlen(str);
  90                 if (!strcmp(arg, str) ||
  91                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  92                         return 1;
  93         }
  94 }
  95
  96 /* Output argument as a string, either SQ or normal */
  97 static void show(const char *arg)
  98 {
  99         if (output_sq) {
 100                 int sq = '\'', ch;
 101
 102                 putchar(sq);
 103                 while ((ch = *arg++)) {
 104                         if (ch == sq)
 105                                 fputs("'\\'", stdout);
 106                         putchar(ch);
 107                 }
 108                 putchar(sq);
 109                 putchar(' ');
 110         }
 111         else
 112                 puts(arg);
 113 }
 114
 115 /* Like show(), but with a negation prefix according to type */
 116 static void show_with_type(int type, const char *arg)
 117 {
 118         if (type != show_type)
 119                 putchar('^');
 120         show(arg);
 121 }
 122
 123 /* Output a revision, only if filter allows it */
 124 static void show_rev(int type, const unsigned char *sha1, const char *name)
 125 {
 126         if (!(filter & DO_REVS))
 127                 return;
 128         def = NULL;
 129
 130         if ((symbolic || abbrev_ref) && name) {
 131                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 132                         unsigned char discard[20];
 133                         char *full;
 134
 135                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 136                         case 0:
 137                                 /*
 138                                  * Not found -- not a ref.  We could
 139                                  * emit "name" here, but symbolic-full
 140                                  * users are interested in finding the
 141                                  * refs spelled in full, and they would
 142                                  * need to filter non-refs if we did so.
 143                                  */
 144                                 break;
 145                         case 1: /* happy */
 146                                 if (abbrev_ref)
 147                                         full = shorten_unambiguous_ref(full,
 148                                                 abbrev_ref_strict);
 149                                 show_with_type(type, full);
 150                                 break;
 151                         default: /* ambiguous */
 152                                 error("refname '%s' is ambiguous", name);
 153                                 break;
 154                         }
 155                         free(full);
 156                 } else {
 157                         show_with_type(type, name);
 158                 }
 159         }
 160         else if (abbrev)
 161                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 162         else
 163                 show_with_type(type, sha1_to_hex(sha1));
 164 }
 165
 166 /* Output a flag, only if filter allows it. */
 167 static int show_flag(const char *arg)
 168 {
 169         if (!(filter & DO_FLAGS))
 170                 return 0;
 171         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 172                 show(arg);
 173                 return 1;
 174         }
 175         return 0;
 176 }
 177
 178 static int show_default(void)
 179 {
 180         const char *s = def;
 181
 182         if (s) {
 183                 unsigned char sha1[20];
 184
 185                 def = NULL;
 186                 if (!get_sha1(s, sha1)) {
 187                         show_rev(NORMAL, sha1, s);
 188                         return 1;
 189                 }
 190         }
 191         return 0;
 192 }
 193
 194 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 195 {
 196         if (ref_excluded(ref_excludes, refname))
 197                 return 0;
 198         show_rev(NORMAL, oid->hash, refname);
 199         return 0;
 200 }
 201
 202 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 203 {
 204         show_rev(REVERSED, oid->hash, refname);
 205         return 0;
 206 }
 207
 208 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 209 {
 210         show_rev(NORMAL, sha1, NULL);
 211         return 0;
 212 }
 213
 214 static void show_datestring(const char *flag, const char *datestr)
 215 {
 216         static char buffer[100];
 217
 218         /* date handling requires both flags and revs */
 219         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 220                 return;
 221         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 222         show(buffer);
 223 }
 224
 225 static int show_file(const char *arg, int output_prefix)
 226 {
 227         show_default();
 228         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 229                 if (output_prefix) {
 230                         const char *prefix = startup_info->prefix;
 231                         show(prefix_filename(prefix,
 232                                              prefix ? strlen(prefix) : 0,
 233                                              arg));
 234                 } else
 235                         show(arg);
 236                 return 1;
 237         }
 238         return 0;
 239 }
 240
 241 static int try_difference(const char *arg)
 242 {
 243         char *dotdot;
 244         unsigned char sha1[20];
 245         unsigned char end[20];
 246         const char *next;
 247         const char *this;
 248         int symmetric;
 249         static const char head_by_default[] = "HEAD";
 250
 251         if (!(dotdot = strstr(arg, "..")))
 252                 return 0;
 253         next = dotdot + 2;
 254         this = arg;
 255         symmetric = (*next == '.');
 256
 257         *dotdot = 0;
 258         next += symmetric;
 259
 260         if (!*next)
 261                 next = head_by_default;
 262         if (dotdot == arg)
 263                 this = head_by_default;
 264
 265         if (this == head_by_default && next == head_by_default &&
 266             !symmetric) {
 267                 /*
 268                  * Just ".."?  That is not a range but the
 269                  * pathspec for the parent directory.
 270                  */
 271                 *dotdot = '.';
 272                 return 0;
 273         }
 274
 275         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 276                 show_rev(NORMAL, end, next);
 277                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 278                 if (symmetric) {
 279                         struct commit_list *exclude;
 280                         struct commit *a, *b;
 281                         a = lookup_commit_reference(sha1);
 282                         b = lookup_commit_reference(end);
 283                         exclude = get_merge_bases(a, b);
 284                         while (exclude) {
 285                                 struct commit *commit = pop_commit(&exclude);
 286                                 show_rev(REVERSED, commit->object.oid.hash, NULL);
 287                         }
 288                 }
 289                 *dotdot = '.';
 290                 return 1;
 291         }
 292         *dotdot = '.';
 293         return 0;
 294 }
 295
 296 static int try_parent_shorthands(const char *arg)
 297 {
 298         char *dotdot;
 299         unsigned char sha1[20];
 300         struct commit *commit;
 301         struct commit_list *parents;
 302         int parent_number;
 303         int include_rev = 0;
 304         int include_parents = 0;
 305         int exclude_parent = 0;
 306
 307         if ((dotdot = strstr(arg, "^!"))) {
 308                 include_rev = 1;
 309                 if (dotdot[2])
 310                         return 0;
 311         } else if ((dotdot = strstr(arg, "^@"))) {
 312                 include_parents = 1;
 313                 if (dotdot[2])
 314                         return 0;
 315         } else if ((dotdot = strstr(arg, "^-"))) {
 316                 include_rev = 1;
 317                 exclude_parent = 1;
 318
 319                 if (dotdot[2]) {
 320                         char *end;
 321                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 322                         if (*end != '\0' || !exclude_parent)
 323                                 return 0;
 324                 }
 325         } else
 326                 return 0;
 327
 328         *dotdot = 0;
 329         if (get_sha1_committish(arg, sha1)) {
 330                 *dotdot = '^';
 331                 return 0;
 332         }
 333
 334         commit = lookup_commit_reference(sha1);
 335         if (exclude_parent &&
 336             exclude_parent > commit_list_count(commit->parents)) {
 337                 *dotdot = '^';
 338                 return 0;
 339         }
 340
 341         if (include_rev)
 342                 show_rev(NORMAL, sha1, arg);
 343         for (parents = commit->parents, parent_number = 1;
 344              parents;
 345              parents = parents->next, parent_number++) {
 346                 char *name = NULL;
 347
 348                 if (exclude_parent && parent_number != exclude_parent)
 349                         continue;
 350
 351                 if (symbolic)
 352                         name = xstrfmt("%s^%d", arg, parent_number);
 353                 show_rev(include_parents ? NORMAL : REVERSED,
 354                          parents->item->object.oid.hash, name);
 355                 free(name);
 356         }
 357
 358         *dotdot = '^';
 359         return 1;
 360 }
 361
 362 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 363 {
 364         struct strbuf *parsed = o->value;
 365         if (unset)
 366                 strbuf_addf(parsed, " --no-%s", o->long_name);
 367         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 368                 strbuf_addf(parsed, " -%c", o->short_name);
 369         else
 370                 strbuf_addf(parsed, " --%s", o->long_name);
 371         if (arg) {
 372                 if (!stuck_long)
 373                         strbuf_addch(parsed, ' ');
 374                 else if (o->long_name)
 375                         strbuf_addch(parsed, '=');
 376                 sq_quote_buf(parsed, arg);
 377         }
 378         return 0;
 379 }
 380
 381 static const char *skipspaces(const char *s)
 382 {
 383         while (isspace(*s))
 384                 s++;
 385         return s;
 386 }
 387
 388 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 389 {
 390         static int keep_dashdash = 0, stop_at_non_option = 0;
 391         static char const * const parseopt_usage[] = {
 392                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 393                 NULL
 394         };
 395         static struct option parseopt_opts[] = {
 396                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 397                                         N_("keep the `--` passed as an arg")),
 398                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 399                                         N_("stop parsing after the "
 400                                            "first non-option argument")),
 401                 OPT_BOOL(0, "stuck-long", &stuck_long,
 402                                         N_("output in stuck long form")),
 403                 OPT_END(),
 404         };
 405         static const char * const flag_chars = "*=?!";
 406
 407         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 408         const char **usage = NULL;
 409         struct option *opts = NULL;
 410         int onb = 0, osz = 0, unb = 0, usz = 0;
 411
 412         strbuf_addstr(&parsed, "set --");
 413         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 414                              PARSE_OPT_KEEP_DASHDASH);
 415         if (argc < 1 || strcmp(argv[0], "--"))
 416                 usage_with_options(parseopt_usage, parseopt_opts);
 417
 418         /* get the usage up to the first line with a -- on it */
 419         for (;;) {
 420                 if (strbuf_getline(&sb, stdin) == EOF)
 421                         die("premature end of input");
 422                 ALLOC_GROW(usage, unb + 1, usz);
 423                 if (!strcmp("--", sb.buf)) {
 424                         if (unb < 1)
 425                                 die("no usage string given before the `--' separator");
 426                         usage[unb] = NULL;
 427                         break;
 428                 }
 429                 usage[unb++] = strbuf_detach(&sb, NULL);
 430         }
 431
 432         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 433         while (strbuf_getline(&sb, stdin) != EOF) {
 434                 const char *s;
 435                 const char *help;
 436                 struct option *o;
 437
 438                 if (!sb.len)
 439                         continue;
 440
 441                 ALLOC_GROW(opts, onb + 1, osz);
 442                 memset(opts + onb, 0, sizeof(opts[onb]));
 443
 444                 o = &opts[onb++];
 445                 help = strchr(sb.buf, ' ');
 446                 if (!help || *sb.buf == ' ') {
 447                         o->type = OPTION_GROUP;
 448                         o->help = xstrdup(skipspaces(sb.buf));
 449                         continue;
 450                 }
 451
 452                 o->type = OPTION_CALLBACK;
 453                 o->help = xstrdup(skipspaces(help));
 454                 o->value = &parsed;
 455                 o->flags = PARSE_OPT_NOARG;
 456                 o->callback = &parseopt_dump;
 457
 458                 /* name(s) */
 459                 s = strpbrk(sb.buf, flag_chars);
 460                 if (s == NULL)
 461                         s = help;
 462
 463                 if (s - sb.buf == 1) /* short option only */
 464                         o->short_name = *sb.buf;
 465                 else if (sb.buf[1] != ',') /* long option only */
 466                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 467                 else {
 468                         o->short_name = *sb.buf;
 469                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 470                 }
 471
 472                 /* flags */
 473                 while (s < help) {
 474                         switch (*s++) {
 475                         case '=':
 476                                 o->flags &= ~PARSE_OPT_NOARG;
 477                                 continue;
 478                         case '?':
 479                                 o->flags &= ~PARSE_OPT_NOARG;
 480                                 o->flags |= PARSE_OPT_OPTARG;
 481                                 continue;
 482                         case '!':
 483                                 o->flags |= PARSE_OPT_NONEG;
 484                                 continue;
 485                         case '*':
 486                                 o->flags |= PARSE_OPT_HIDDEN;
 487                                 continue;
 488                         }
 489                         s--;
 490                         break;
 491                 }
 492
 493                 if (s < help)
 494                         o->argh = xmemdupz(s, help - s);
 495         }
 496         strbuf_release(&sb);
 497
 498         /* put an OPT_END() */
 499         ALLOC_GROW(opts, onb + 1, osz);
 500         memset(opts + onb, 0, sizeof(opts[onb]));
 501         argc = parse_options(argc, argv, prefix, opts, usage,
 502                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 503                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 504                         PARSE_OPT_SHELL_EVAL);
 505
 506         strbuf_addstr(&parsed, " --");
 507         sq_quote_argv(&parsed, argv, 0);
 508         puts(parsed.buf);
 509         return 0;
 510 }
 511
 512 static int cmd_sq_quote(int argc, const char **argv)
 513 {
 514         struct strbuf buf = STRBUF_INIT;
 515
 516         if (argc)
 517                 sq_quote_argv(&buf, argv, 0);
 518         printf("%s\n", buf.buf);
 519         strbuf_release(&buf);
 520
 521         return 0;
 522 }
 523
 524 static void die_no_single_rev(int quiet)
 525 {
 526         if (quiet)
 527                 exit(1);
 528         else
 529                 die("Needed a single revision");
 530 }
 531
 532 static const char builtin_rev_parse_usage[] =
 533 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 534    "   or: git rev-parse --sq-quote [<arg>...]\n"
 535    "   or: git rev-parse [<options>] [<arg>...]\n"
 536    "\n"
 537    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 538
 539 /*
 540  * Parse "opt" or "opt=<value>", setting value respectively to either
 541  * NULL or the string after "=".
 542  */
 543 static int opt_with_value(const char *arg, const char *opt, const char **value)
 544 {
 545         if (skip_prefix(arg, opt, &arg)) {
 546                 if (!*arg) {
 547                         *value = NULL;
 548                         return 1;
 549                 }
 550                 if (*arg++ == '=') {
 551                         *value = arg;
 552                         return 1;
 553                 }
 554         }
 555         return 0;
 556 }
 557
 558 static void handle_ref_opt(const char *pattern, const char *prefix)
 559 {
 560         if (pattern)
 561                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 562         else
 563                 for_each_ref_in(prefix, show_reference, NULL);
 564         clear_ref_exclusion(&ref_excludes);
 565 }
 566
 567 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 568 {
 569         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 570         int did_repo_setup = 0;
 571         int has_dashdash = 0;
 572         int output_prefix = 0;
 573         unsigned char sha1[20];
 574         unsigned int flags = 0;
 575         const char *name = NULL;
 576         struct object_context unused;
 577         struct strbuf buf = STRBUF_INIT;
 578
 579         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 580                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 581
 582         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 583                 return cmd_sq_quote(argc - 2, argv + 2);
 584
 585         if (argc > 1 && !strcmp("-h", argv[1]))
 586                 usage(builtin_rev_parse_usage);
 587
 588         for (i = 1; i < argc; i++) {
 589                 if (!strcmp(argv[i], "--")) {
 590                         has_dashdash = 1;
 591                         break;
 592                 }
 593         }
 594
 595         /* No options; just report on whether we're in a git repo or not. */
 596         if (argc == 1) {
 597                 setup_git_directory();
 598                 git_config(git_default_config, NULL);
 599                 return 0;
 600         }
 601
 602         for (i = 1; i < argc; i++) {
 603                 const char *arg = argv[i];
 604
 605                 if (!strcmp(arg, "--local-env-vars")) {
 606                         int i;
 607                         for (i = 0; local_repo_env[i]; i++)
 608                                 printf("%s\n", local_repo_env[i]);
 609                         continue;
 610                 }
 611                 if (!strcmp(arg, "--resolve-git-dir")) {
 612                         const char *gitdir = argv[++i];
 613                         if (!gitdir)
 614                                 die("--resolve-git-dir requires an argument");
 615                         gitdir = resolve_gitdir(gitdir);
 616                         if (!gitdir)
 617                                 die("not a gitdir '%s'", argv[i]);
 618                         puts(gitdir);
 619                         continue;
 620                 }
 621
 622                 /* The rest of the options require a git repository. */
 623                 if (!did_repo_setup) {
 624                         prefix = setup_git_directory();
 625                         git_config(git_default_config, NULL);
 626                         did_repo_setup = 1;
 627                 }
 628
 629                 if (!strcmp(arg, "--git-path")) {
 630                         if (!argv[i + 1])
 631                                 die("--git-path requires an argument");
 632                         strbuf_reset(&buf);
 633                         puts(relative_path(git_path("%s", argv[i + 1]),
 634                                            prefix, &buf));
 635                         i++;
 636                         continue;
 637                 }
 638                 if (as_is) {
 639                         if (show_file(arg, output_prefix) && as_is < 2)
 640                                 verify_filename(prefix, arg, 0);
 641                         continue;
 642                 }
 643                 if (!strcmp(arg,"-n")) {
 644                         if (++i >= argc)
 645                                 die("-n requires an argument");
 646                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 647                                 show(arg);
 648                                 show(argv[i]);
 649                         }
 650                         continue;
 651                 }
 652                 if (starts_with(arg, "-n")) {
 653                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 654                                 show(arg);
 655                         continue;
 656                 }
 657
 658                 if (*arg == '-') {
 659                         if (!strcmp(arg, "--")) {
 660                                 as_is = 2;
 661                                 /* Pass on the "--" if we show anything but files.. */
 662                                 if (filter & (DO_FLAGS | DO_REVS))
 663                                         show_file(arg, 0);
 664                                 continue;
 665                         }
 666                         if (!strcmp(arg, "--default")) {
 667                                 def = argv[++i];
 668                                 if (!def)
 669                                         die("--default requires an argument");
 670                                 continue;
 671                         }
 672                         if (!strcmp(arg, "--prefix")) {
 673                                 prefix = argv[++i];
 674                                 if (!prefix)
 675                                         die("--prefix requires an argument");
 676                                 startup_info->prefix = prefix;
 677                                 output_prefix = 1;
 678                                 continue;
 679                         }
 680                         if (!strcmp(arg, "--revs-only")) {
 681                                 filter &= ~DO_NOREV;
 682                                 continue;
 683                         }
 684                         if (!strcmp(arg, "--no-revs")) {
 685                                 filter &= ~DO_REVS;
 686                                 continue;
 687                         }
 688                         if (!strcmp(arg, "--flags")) {
 689                                 filter &= ~DO_NONFLAGS;
 690                                 continue;
 691                         }
 692                         if (!strcmp(arg, "--no-flags")) {
 693                                 filter &= ~DO_FLAGS;
 694                                 continue;
 695                         }
 696                         if (!strcmp(arg, "--verify")) {
 697                                 filter &= ~(DO_FLAGS|DO_NOREV);
 698                                 verify = 1;
 699                                 continue;
 700                         }
 701                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 702                                 quiet = 1;
 703                                 flags |= GET_SHA1_QUIETLY;
 704                                 continue;
 705                         }
 706                         if (opt_with_value(arg, "--short", &arg)) {
 707                                 filter &= ~(DO_FLAGS|DO_NOREV);
 708                                 verify = 1;
 709                                 abbrev = DEFAULT_ABBREV;
 710                                 if (!arg)
 711                                         continue;
 712                                 abbrev = strtoul(arg, NULL, 10);
 713                                 if (abbrev < MINIMUM_ABBREV)
 714                                         abbrev = MINIMUM_ABBREV;
 715                                 else if (40 <= abbrev)
 716                                         abbrev = 40;
 717                                 continue;
 718                         }
 719                         if (!strcmp(arg, "--sq")) {
 720                                 output_sq = 1;
 721                                 continue;
 722                         }
 723                         if (!strcmp(arg, "--not")) {
 724                                 show_type ^= REVERSED;
 725                                 continue;
 726                         }
 727                         if (!strcmp(arg, "--symbolic")) {
 728                                 symbolic = SHOW_SYMBOLIC_ASIS;
 729                                 continue;
 730                         }
 731                         if (!strcmp(arg, "--symbolic-full-name")) {
 732                                 symbolic = SHOW_SYMBOLIC_FULL;
 733                                 continue;
 734                         }
 735                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 736                                 abbrev_ref = 1;
 737                                 abbrev_ref_strict = warn_ambiguous_refs;
 738                                 if (arg) {
 739                                         if (!strcmp(arg, "strict"))
 740                                                 abbrev_ref_strict = 1;
 741                                         else if (!strcmp(arg, "loose"))
 742                                                 abbrev_ref_strict = 0;
 743                                         else
 744                                                 die("unknown mode for --abbrev-ref: %s",
 745                                                     arg);
 746                                 }
 747                                 continue;
 748                         }
 749                         if (!strcmp(arg, "--all")) {
 750                                 for_each_ref(show_reference, NULL);
 751                                 continue;
 752                         }
 753                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 754                                 for_each_abbrev(arg, show_abbrev, NULL);
 755                                 continue;
 756                         }
 757                         if (!strcmp(arg, "--bisect")) {
 758                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 759                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 760                                 continue;
 761                         }
 762                         if (opt_with_value(arg, "--branches", &arg)) {
 763                                 handle_ref_opt(arg, "refs/heads/");
 764                                 continue;
 765                         }
 766                         if (opt_with_value(arg, "--tags", &arg)) {
 767                                 handle_ref_opt(arg, "refs/tags/");
 768                                 continue;
 769                         }
 770                         if (skip_prefix(arg, "--glob=", &arg)) {
 771                                 handle_ref_opt(arg, NULL);
 772                                 continue;
 773                         }
 774                         if (opt_with_value(arg, "--remotes", &arg)) {
 775                                 handle_ref_opt(arg, "refs/remotes/");
 776                                 continue;
 777                         }
 778                         if (skip_prefix(arg, "--exclude=", &arg)) {
 779                                 add_ref_exclusion(&ref_excludes, arg);
 780                                 continue;
 781                         }
 782                         if (!strcmp(arg, "--show-toplevel")) {
 783                                 const char *work_tree = get_git_work_tree();
 784                                 if (work_tree)
 785                                         puts(work_tree);
 786                                 continue;
 787                         }
 788                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 789                                 const char *superproject = get_superproject_working_tree();
 790                                 if (superproject)
 791                                         puts(superproject);
 792                                 continue;
 793                         }
 794                         if (!strcmp(arg, "--show-prefix")) {
 795                                 if (prefix)
 796                                         puts(prefix);
 797                                 else
 798                                         putchar('\n');
 799                                 continue;
 800                         }
 801                         if (!strcmp(arg, "--show-cdup")) {
 802                                 const char *pfx = prefix;
 803                                 if (!is_inside_work_tree()) {
 804                                         const char *work_tree =
 805                                                 get_git_work_tree();
 806                                         if (work_tree)
 807                                                 printf("%s\n", work_tree);
 808                                         continue;
 809                                 }
 810                                 while (pfx) {
 811                                         pfx = strchr(pfx, '/');
 812                                         if (pfx) {
 813                                                 pfx++;
 814                                                 printf("../");
 815                                         }
 816                                 }
 817                                 putchar('\n');
 818                                 continue;
 819                         }
 820                         if (!strcmp(arg, "--git-dir") ||
 821                             !strcmp(arg, "--absolute-git-dir")) {
 822                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 823                                 char *cwd;
 824                                 int len;
 825                                 if (arg[2] == 'g') {    /* --git-dir */
 826                                         if (gitdir) {
 827                                                 puts(gitdir);
 828                                                 continue;
 829                                         }
 830                                         if (!prefix) {
 831                                                 puts(".git");
 832                                                 continue;
 833                                         }
 834                                 } else {                /* --absolute-git-dir */
 835                                         if (!gitdir && !prefix)
 836                                                 gitdir = ".git";
 837                                         if (gitdir) {
 838                                                 puts(real_path(gitdir));
 839                                                 continue;
 840                                         }
 841                                 }
 842                                 cwd = xgetcwd();
 843                                 len = strlen(cwd);
 844                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 845                                 free(cwd);
 846                                 continue;
 847                         }
 848                         if (!strcmp(arg, "--git-common-dir")) {
 849                                 strbuf_reset(&buf);
 850                                 puts(relative_path(get_git_common_dir(),
 851                                                    prefix, &buf));
 852                                 continue;
 853                         }
 854                         if (!strcmp(arg, "--is-inside-git-dir")) {
 855                                 printf("%s\n", is_inside_git_dir() ? "true"
 856                                                 : "false");
 857                                 continue;
 858                         }
 859                         if (!strcmp(arg, "--is-inside-work-tree")) {
 860                                 printf("%s\n", is_inside_work_tree() ? "true"
 861                                                 : "false");
 862                                 continue;
 863                         }
 864                         if (!strcmp(arg, "--is-bare-repository")) {
 865                                 printf("%s\n", is_bare_repository() ? "true"
 866                                                 : "false");
 867                                 continue;
 868                         }
 869                         if (!strcmp(arg, "--shared-index-path")) {
 870                                 if (read_cache() < 0)
 871                                         die(_("Could not read the index"));
 872                                 if (the_index.split_index) {
 873                                         const unsigned char *sha1 = the_index.split_index->base_sha1;
 874                                         const char *path = git_path("sharedindex.%s", sha1_to_hex(sha1));
 875                                         strbuf_reset(&buf);
 876                                         puts(relative_path(path, prefix, &buf));
 877                                 }
 878                                 continue;
 879                         }
 880                         if (skip_prefix(arg, "--since=", &arg)) {
 881                                 show_datestring("--max-age=", arg);
 882                                 continue;
 883                         }
 884                         if (skip_prefix(arg, "--after=", &arg)) {
 885                                 show_datestring("--max-age=", arg);
 886                                 continue;
 887                         }
 888                         if (skip_prefix(arg, "--before=", &arg)) {
 889                                 show_datestring("--min-age=", arg);
 890                                 continue;
 891                         }
 892                         if (skip_prefix(arg, "--until=", &arg)) {
 893                                 show_datestring("--min-age=", arg);
 894                                 continue;
 895                         }
 896                         if (show_flag(arg) && verify)
 897                                 die_no_single_rev(quiet);
 898                         continue;
 899                 }
 900
 901                 /* Not a flag argument */
 902                 if (try_difference(arg))
 903                         continue;
 904                 if (try_parent_shorthands(arg))
 905                         continue;
 906                 name = arg;
 907                 type = NORMAL;
 908                 if (*arg == '^') {
 909                         name++;
 910                         type = REVERSED;
 911                 }
 912                 if (!get_sha1_with_context(name, flags, sha1, &unused)) {
 913                         if (verify)
 914                                 revs_count++;
 915                         else
 916                                 show_rev(type, sha1, name);
 917                         continue;
 918                 }
 919                 if (verify)
 920                         die_no_single_rev(quiet);
 921                 if (has_dashdash)
 922                         die("bad revision '%s'", arg);
 923                 as_is = 1;
 924                 if (!show_file(arg, output_prefix))
 925                         continue;
 926                 verify_filename(prefix, arg, 1);
 927         }
 928         strbuf_release(&buf);
 929         if (verify) {
 930                 if (revs_count == 1) {
 931                         show_rev(type, sha1, name);
 932                         return 0;
 933                 } else if (revs_count == 0 && show_default())
 934                         return 0;
 935                 die_no_single_rev(quiet);
 936         } else
 937                 show_default();
 938         return 0;
 939 }