builtin/rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "config.h"
   8 #include "commit.h"
   9 #include "refs.h"
  10 #include "quote.h"
  11 #include "builtin.h"
  12 #include "parse-options.h"
  13 #include "diff.h"
  14 #include "revision.h"
  15 #include "split-index.h"
  16 #include "submodule.h"
  17
  18 #define DO_REVS         1
  19 #define DO_NOREV        2
  20 #define DO_FLAGS        4
  21 #define DO_NONFLAGS     8
  22 static int filter = ~0;
  23
  24 static const char *def;
  25
  26 #define NORMAL 0
  27 #define REVERSED 1
  28 static int show_type = NORMAL;
  29
  30 #define SHOW_SYMBOLIC_ASIS 1
  31 #define SHOW_SYMBOLIC_FULL 2
  32 static int symbolic;
  33 static int abbrev;
  34 static int abbrev_ref;
  35 static int abbrev_ref_strict;
  36 static int output_sq;
  37
  38 static int stuck_long;
  39 static struct string_list *ref_excludes;
  40
  41 /*
  42  * Some arguments are relevant "revision" arguments,
  43  * others are about output format or other details.
  44  * This sorts it all out.
  45  */
  46 static int is_rev_argument(const char *arg)
  47 {
  48         static const char *rev_args[] = {
  49                 "--all",
  50                 "--bisect",
  51                 "--dense",
  52                 "--branches=",
  53                 "--branches",
  54                 "--header",
  55                 "--ignore-missing",
  56                 "--max-age=",
  57                 "--max-count=",
  58                 "--min-age=",
  59                 "--no-merges",
  60                 "--min-parents=",
  61                 "--no-min-parents",
  62                 "--max-parents=",
  63                 "--no-max-parents",
  64                 "--objects",
  65                 "--objects-edge",
  66                 "--parents",
  67                 "--pretty",
  68                 "--remotes=",
  69                 "--remotes",
  70                 "--glob=",
  71                 "--sparse",
  72                 "--tags=",
  73                 "--tags",
  74                 "--topo-order",
  75                 "--date-order",
  76                 "--unpacked",
  77                 NULL
  78         };
  79         const char **p = rev_args;
  80
  81         /* accept -<digit>, like traditional "head" */
  82         if ((*arg == '-') && isdigit(arg[1]))
  83                 return 1;
  84
  85         for (;;) {
  86                 const char *str = *p++;
  87                 int len;
  88                 if (!str)
  89                         return 0;
  90                 len = strlen(str);
  91                 if (!strcmp(arg, str) ||
  92                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  93                         return 1;
  94         }
  95 }
  96
  97 /* Output argument as a string, either SQ or normal */
  98 static void show(const char *arg)
  99 {
 100         if (output_sq) {
 101                 int sq = '\'', ch;
 102
 103                 putchar(sq);
 104                 while ((ch = *arg++)) {
 105                         if (ch == sq)
 106                                 fputs("'\\'", stdout);
 107                         putchar(ch);
 108                 }
 109                 putchar(sq);
 110                 putchar(' ');
 111         }
 112         else
 113                 puts(arg);
 114 }
 115
 116 /* Like show(), but with a negation prefix according to type */
 117 static void show_with_type(int type, const char *arg)
 118 {
 119         if (type != show_type)
 120                 putchar('^');
 121         show(arg);
 122 }
 123
 124 /* Output a revision, only if filter allows it */
 125 static void show_rev(int type, const struct object_id *oid, const char *name)
 126 {
 127         if (!(filter & DO_REVS))
 128                 return;
 129         def = NULL;
 130
 131         if ((symbolic || abbrev_ref) && name) {
 132                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 133                         struct object_id discard;
 134                         char *full;
 135
 136                         switch (dwim_ref(name, strlen(name), discard.hash, &full)) {
 137                         case 0:
 138                                 /*
 139                                  * Not found -- not a ref.  We could
 140                                  * emit "name" here, but symbolic-full
 141                                  * users are interested in finding the
 142                                  * refs spelled in full, and they would
 143                                  * need to filter non-refs if we did so.
 144                                  */
 145                                 break;
 146                         case 1: /* happy */
 147                                 if (abbrev_ref)
 148                                         full = shorten_unambiguous_ref(full,
 149                                                 abbrev_ref_strict);
 150                                 show_with_type(type, full);
 151                                 break;
 152                         default: /* ambiguous */
 153                                 error("refname '%s' is ambiguous", name);
 154                                 break;
 155                         }
 156                         free(full);
 157                 } else {
 158                         show_with_type(type, name);
 159                 }
 160         }
 161         else if (abbrev)
 162                 show_with_type(type, find_unique_abbrev(oid->hash, abbrev));
 163         else
 164                 show_with_type(type, oid_to_hex(oid));
 165 }
 166
 167 /* Output a flag, only if filter allows it. */
 168 static int show_flag(const char *arg)
 169 {
 170         if (!(filter & DO_FLAGS))
 171                 return 0;
 172         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 173                 show(arg);
 174                 return 1;
 175         }
 176         return 0;
 177 }
 178
 179 static int show_default(void)
 180 {
 181         const char *s = def;
 182
 183         if (s) {
 184                 struct object_id oid;
 185
 186                 def = NULL;
 187                 if (!get_oid(s, &oid)) {
 188                         show_rev(NORMAL, &oid, s);
 189                         return 1;
 190                 }
 191         }
 192         return 0;
 193 }
 194
 195 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 196 {
 197         if (ref_excluded(ref_excludes, refname))
 198                 return 0;
 199         show_rev(NORMAL, oid, refname);
 200         return 0;
 201 }
 202
 203 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 204 {
 205         show_rev(REVERSED, oid, refname);
 206         return 0;
 207 }
 208
 209 static int show_abbrev(const struct object_id *oid, void *cb_data)
 210 {
 211         show_rev(NORMAL, oid, NULL);
 212         return 0;
 213 }
 214
 215 static void show_datestring(const char *flag, const char *datestr)
 216 {
 217         char *buffer;
 218
 219         /* date handling requires both flags and revs */
 220         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 221                 return;
 222         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
 223         show(buffer);
 224         free(buffer);
 225 }
 226
 227 static int show_file(const char *arg, int output_prefix)
 228 {
 229         show_default();
 230         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 231                 if (output_prefix) {
 232                         const char *prefix = startup_info->prefix;
 233                         char *fname = prefix_filename(prefix, arg);
 234                         show(fname);
 235                         free(fname);
 236                 } else
 237                         show(arg);
 238                 return 1;
 239         }
 240         return 0;
 241 }
 242
 243 static int try_difference(const char *arg)
 244 {
 245         char *dotdot;
 246         struct object_id oid;
 247         struct object_id end;
 248         const char *next;
 249         const char *this;
 250         int symmetric;
 251         static const char head_by_default[] = "HEAD";
 252
 253         if (!(dotdot = strstr(arg, "..")))
 254                 return 0;
 255         next = dotdot + 2;
 256         this = arg;
 257         symmetric = (*next == '.');
 258
 259         *dotdot = 0;
 260         next += symmetric;
 261
 262         if (!*next)
 263                 next = head_by_default;
 264         if (dotdot == arg)
 265                 this = head_by_default;
 266
 267         if (this == head_by_default && next == head_by_default &&
 268             !symmetric) {
 269                 /*
 270                  * Just ".."?  That is not a range but the
 271                  * pathspec for the parent directory.
 272                  */
 273                 *dotdot = '.';
 274                 return 0;
 275         }
 276
 277         if (!get_sha1_committish(this, oid.hash) && !get_sha1_committish(next, end.hash)) {
 278                 show_rev(NORMAL, &end, next);
 279                 show_rev(symmetric ? NORMAL : REVERSED, &oid, this);
 280                 if (symmetric) {
 281                         struct commit_list *exclude;
 282                         struct commit *a, *b;
 283                         a = lookup_commit_reference(&oid);
 284                         b = lookup_commit_reference(&end);
 285                         exclude = get_merge_bases(a, b);
 286                         while (exclude) {
 287                                 struct commit *commit = pop_commit(&exclude);
 288                                 show_rev(REVERSED, &commit->object.oid, NULL);
 289                         }
 290                 }
 291                 *dotdot = '.';
 292                 return 1;
 293         }
 294         *dotdot = '.';
 295         return 0;
 296 }
 297
 298 static int try_parent_shorthands(const char *arg)
 299 {
 300         char *dotdot;
 301         struct object_id oid;
 302         struct commit *commit;
 303         struct commit_list *parents;
 304         int parent_number;
 305         int include_rev = 0;
 306         int include_parents = 0;
 307         int exclude_parent = 0;
 308
 309         if ((dotdot = strstr(arg, "^!"))) {
 310                 include_rev = 1;
 311                 if (dotdot[2])
 312                         return 0;
 313         } else if ((dotdot = strstr(arg, "^@"))) {
 314                 include_parents = 1;
 315                 if (dotdot[2])
 316                         return 0;
 317         } else if ((dotdot = strstr(arg, "^-"))) {
 318                 include_rev = 1;
 319                 exclude_parent = 1;
 320
 321                 if (dotdot[2]) {
 322                         char *end;
 323                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 324                         if (*end != '\0' || !exclude_parent)
 325                                 return 0;
 326                 }
 327         } else
 328                 return 0;
 329
 330         *dotdot = 0;
 331         if (get_sha1_committish(arg, oid.hash)) {
 332                 *dotdot = '^';
 333                 return 0;
 334         }
 335
 336         commit = lookup_commit_reference(&oid);
 337         if (exclude_parent &&
 338             exclude_parent > commit_list_count(commit->parents)) {
 339                 *dotdot = '^';
 340                 return 0;
 341         }
 342
 343         if (include_rev)
 344                 show_rev(NORMAL, &oid, arg);
 345         for (parents = commit->parents, parent_number = 1;
 346              parents;
 347              parents = parents->next, parent_number++) {
 348                 char *name = NULL;
 349
 350                 if (exclude_parent && parent_number != exclude_parent)
 351                         continue;
 352
 353                 if (symbolic)
 354                         name = xstrfmt("%s^%d", arg, parent_number);
 355                 show_rev(include_parents ? NORMAL : REVERSED,
 356                          &parents->item->object.oid, name);
 357                 free(name);
 358         }
 359
 360         *dotdot = '^';
 361         return 1;
 362 }
 363
 364 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 365 {
 366         struct strbuf *parsed = o->value;
 367         if (unset)
 368                 strbuf_addf(parsed, " --no-%s", o->long_name);
 369         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 370                 strbuf_addf(parsed, " -%c", o->short_name);
 371         else
 372                 strbuf_addf(parsed, " --%s", o->long_name);
 373         if (arg) {
 374                 if (!stuck_long)
 375                         strbuf_addch(parsed, ' ');
 376                 else if (o->long_name)
 377                         strbuf_addch(parsed, '=');
 378                 sq_quote_buf(parsed, arg);
 379         }
 380         return 0;
 381 }
 382
 383 static const char *skipspaces(const char *s)
 384 {
 385         while (isspace(*s))
 386                 s++;
 387         return s;
 388 }
 389
 390 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 391 {
 392         static int keep_dashdash = 0, stop_at_non_option = 0;
 393         static char const * const parseopt_usage[] = {
 394                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 395                 NULL
 396         };
 397         static struct option parseopt_opts[] = {
 398                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 399                                         N_("keep the `--` passed as an arg")),
 400                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 401                                         N_("stop parsing after the "
 402                                            "first non-option argument")),
 403                 OPT_BOOL(0, "stuck-long", &stuck_long,
 404                                         N_("output in stuck long form")),
 405                 OPT_END(),
 406         };
 407         static const char * const flag_chars = "*=?!";
 408
 409         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 410         const char **usage = NULL;
 411         struct option *opts = NULL;
 412         int onb = 0, osz = 0, unb = 0, usz = 0;
 413
 414         strbuf_addstr(&parsed, "set --");
 415         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 416                              PARSE_OPT_KEEP_DASHDASH);
 417         if (argc < 1 || strcmp(argv[0], "--"))
 418                 usage_with_options(parseopt_usage, parseopt_opts);
 419
 420         /* get the usage up to the first line with a -- on it */
 421         for (;;) {
 422                 if (strbuf_getline(&sb, stdin) == EOF)
 423                         die("premature end of input");
 424                 ALLOC_GROW(usage, unb + 1, usz);
 425                 if (!strcmp("--", sb.buf)) {
 426                         if (unb < 1)
 427                                 die("no usage string given before the `--' separator");
 428                         usage[unb] = NULL;
 429                         break;
 430                 }
 431                 usage[unb++] = strbuf_detach(&sb, NULL);
 432         }
 433
 434         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 435         while (strbuf_getline(&sb, stdin) != EOF) {
 436                 const char *s;
 437                 const char *help;
 438                 struct option *o;
 439
 440                 if (!sb.len)
 441                         continue;
 442
 443                 ALLOC_GROW(opts, onb + 1, osz);
 444                 memset(opts + onb, 0, sizeof(opts[onb]));
 445
 446                 o = &opts[onb++];
 447                 help = strchr(sb.buf, ' ');
 448                 if (!help || *sb.buf == ' ') {
 449                         o->type = OPTION_GROUP;
 450                         o->help = xstrdup(skipspaces(sb.buf));
 451                         continue;
 452                 }
 453
 454                 o->type = OPTION_CALLBACK;
 455                 o->help = xstrdup(skipspaces(help));
 456                 o->value = &parsed;
 457                 o->flags = PARSE_OPT_NOARG;
 458                 o->callback = &parseopt_dump;
 459
 460                 /* name(s) */
 461                 s = strpbrk(sb.buf, flag_chars);
 462                 if (s == NULL)
 463                         s = help;
 464
 465                 if (s - sb.buf == 1) /* short option only */
 466                         o->short_name = *sb.buf;
 467                 else if (sb.buf[1] != ',') /* long option only */
 468                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 469                 else {
 470                         o->short_name = *sb.buf;
 471                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 472                 }
 473
 474                 /* flags */
 475                 while (s < help) {
 476                         switch (*s++) {
 477                         case '=':
 478                                 o->flags &= ~PARSE_OPT_NOARG;
 479                                 continue;
 480                         case '?':
 481                                 o->flags &= ~PARSE_OPT_NOARG;
 482                                 o->flags |= PARSE_OPT_OPTARG;
 483                                 continue;
 484                         case '!':
 485                                 o->flags |= PARSE_OPT_NONEG;
 486                                 continue;
 487                         case '*':
 488                                 o->flags |= PARSE_OPT_HIDDEN;
 489                                 continue;
 490                         }
 491                         s--;
 492                         break;
 493                 }
 494
 495                 if (s < help)
 496                         o->argh = xmemdupz(s, help - s);
 497         }
 498         strbuf_release(&sb);
 499
 500         /* put an OPT_END() */
 501         ALLOC_GROW(opts, onb + 1, osz);
 502         memset(opts + onb, 0, sizeof(opts[onb]));
 503         argc = parse_options(argc, argv, prefix, opts, usage,
 504                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 505                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 506                         PARSE_OPT_SHELL_EVAL);
 507
 508         strbuf_addstr(&parsed, " --");
 509         sq_quote_argv(&parsed, argv, 0);
 510         puts(parsed.buf);
 511         return 0;
 512 }
 513
 514 static int cmd_sq_quote(int argc, const char **argv)
 515 {
 516         struct strbuf buf = STRBUF_INIT;
 517
 518         if (argc)
 519                 sq_quote_argv(&buf, argv, 0);
 520         printf("%s\n", buf.buf);
 521         strbuf_release(&buf);
 522
 523         return 0;
 524 }
 525
 526 static void die_no_single_rev(int quiet)
 527 {
 528         if (quiet)
 529                 exit(1);
 530         else
 531                 die("Needed a single revision");
 532 }
 533
 534 static const char builtin_rev_parse_usage[] =
 535 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 536    "   or: git rev-parse --sq-quote [<arg>...]\n"
 537    "   or: git rev-parse [<options>] [<arg>...]\n"
 538    "\n"
 539    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 540
 541 /*
 542  * Parse "opt" or "opt=<value>", setting value respectively to either
 543  * NULL or the string after "=".
 544  */
 545 static int opt_with_value(const char *arg, const char *opt, const char **value)
 546 {
 547         if (skip_prefix(arg, opt, &arg)) {
 548                 if (!*arg) {
 549                         *value = NULL;
 550                         return 1;
 551                 }
 552                 if (*arg++ == '=') {
 553                         *value = arg;
 554                         return 1;
 555                 }
 556         }
 557         return 0;
 558 }
 559
 560 static void handle_ref_opt(const char *pattern, const char *prefix)
 561 {
 562         if (pattern)
 563                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 564         else
 565                 for_each_ref_in(prefix, show_reference, NULL);
 566         clear_ref_exclusion(&ref_excludes);
 567 }
 568
 569 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 570 {
 571         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 572         int did_repo_setup = 0;
 573         int has_dashdash = 0;
 574         int output_prefix = 0;
 575         struct object_id oid;
 576         unsigned int flags = 0;
 577         const char *name = NULL;
 578         struct object_context unused;
 579         struct strbuf buf = STRBUF_INIT;
 580
 581         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 582                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 583
 584         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 585                 return cmd_sq_quote(argc - 2, argv + 2);
 586
 587         if (argc > 1 && !strcmp("-h", argv[1]))
 588                 usage(builtin_rev_parse_usage);
 589
 590         for (i = 1; i < argc; i++) {
 591                 if (!strcmp(argv[i], "--")) {
 592                         has_dashdash = 1;
 593                         break;
 594                 }
 595         }
 596
 597         /* No options; just report on whether we're in a git repo or not. */
 598         if (argc == 1) {
 599                 setup_git_directory();
 600                 git_config(git_default_config, NULL);
 601                 return 0;
 602         }
 603
 604         for (i = 1; i < argc; i++) {
 605                 const char *arg = argv[i];
 606
 607                 if (!strcmp(arg, "--local-env-vars")) {
 608                         int i;
 609                         for (i = 0; local_repo_env[i]; i++)
 610                                 printf("%s\n", local_repo_env[i]);
 611                         continue;
 612                 }
 613                 if (!strcmp(arg, "--resolve-git-dir")) {
 614                         const char *gitdir = argv[++i];
 615                         if (!gitdir)
 616                                 die("--resolve-git-dir requires an argument");
 617                         gitdir = resolve_gitdir(gitdir);
 618                         if (!gitdir)
 619                                 die("not a gitdir '%s'", argv[i]);
 620                         puts(gitdir);
 621                         continue;
 622                 }
 623
 624                 /* The rest of the options require a git repository. */
 625                 if (!did_repo_setup) {
 626                         prefix = setup_git_directory();
 627                         git_config(git_default_config, NULL);
 628                         did_repo_setup = 1;
 629                 }
 630
 631                 if (!strcmp(arg, "--git-path")) {
 632                         if (!argv[i + 1])
 633                                 die("--git-path requires an argument");
 634                         strbuf_reset(&buf);
 635                         puts(relative_path(git_path("%s", argv[i + 1]),
 636                                            prefix, &buf));
 637                         i++;
 638                         continue;
 639                 }
 640                 if (as_is) {
 641                         if (show_file(arg, output_prefix) && as_is < 2)
 642                                 verify_filename(prefix, arg, 0);
 643                         continue;
 644                 }
 645                 if (!strcmp(arg,"-n")) {
 646                         if (++i >= argc)
 647                                 die("-n requires an argument");
 648                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 649                                 show(arg);
 650                                 show(argv[i]);
 651                         }
 652                         continue;
 653                 }
 654                 if (starts_with(arg, "-n")) {
 655                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 656                                 show(arg);
 657                         continue;
 658                 }
 659
 660                 if (*arg == '-') {
 661                         if (!strcmp(arg, "--")) {
 662                                 as_is = 2;
 663                                 /* Pass on the "--" if we show anything but files.. */
 664                                 if (filter & (DO_FLAGS | DO_REVS))
 665                                         show_file(arg, 0);
 666                                 continue;
 667                         }
 668                         if (!strcmp(arg, "--default")) {
 669                                 def = argv[++i];
 670                                 if (!def)
 671                                         die("--default requires an argument");
 672                                 continue;
 673                         }
 674                         if (!strcmp(arg, "--prefix")) {
 675                                 prefix = argv[++i];
 676                                 if (!prefix)
 677                                         die("--prefix requires an argument");
 678                                 startup_info->prefix = prefix;
 679                                 output_prefix = 1;
 680                                 continue;
 681                         }
 682                         if (!strcmp(arg, "--revs-only")) {
 683                                 filter &= ~DO_NOREV;
 684                                 continue;
 685                         }
 686                         if (!strcmp(arg, "--no-revs")) {
 687                                 filter &= ~DO_REVS;
 688                                 continue;
 689                         }
 690                         if (!strcmp(arg, "--flags")) {
 691                                 filter &= ~DO_NONFLAGS;
 692                                 continue;
 693                         }
 694                         if (!strcmp(arg, "--no-flags")) {
 695                                 filter &= ~DO_FLAGS;
 696                                 continue;
 697                         }
 698                         if (!strcmp(arg, "--verify")) {
 699                                 filter &= ~(DO_FLAGS|DO_NOREV);
 700                                 verify = 1;
 701                                 continue;
 702                         }
 703                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 704                                 quiet = 1;
 705                                 flags |= GET_SHA1_QUIETLY;
 706                                 continue;
 707                         }
 708                         if (opt_with_value(arg, "--short", &arg)) {
 709                                 filter &= ~(DO_FLAGS|DO_NOREV);
 710                                 verify = 1;
 711                                 abbrev = DEFAULT_ABBREV;
 712                                 if (!arg)
 713                                         continue;
 714                                 abbrev = strtoul(arg, NULL, 10);
 715                                 if (abbrev < MINIMUM_ABBREV)
 716                                         abbrev = MINIMUM_ABBREV;
 717                                 else if (40 <= abbrev)
 718                                         abbrev = 40;
 719                                 continue;
 720                         }
 721                         if (!strcmp(arg, "--sq")) {
 722                                 output_sq = 1;
 723                                 continue;
 724                         }
 725                         if (!strcmp(arg, "--not")) {
 726                                 show_type ^= REVERSED;
 727                                 continue;
 728                         }
 729                         if (!strcmp(arg, "--symbolic")) {
 730                                 symbolic = SHOW_SYMBOLIC_ASIS;
 731                                 continue;
 732                         }
 733                         if (!strcmp(arg, "--symbolic-full-name")) {
 734                                 symbolic = SHOW_SYMBOLIC_FULL;
 735                                 continue;
 736                         }
 737                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 738                                 abbrev_ref = 1;
 739                                 abbrev_ref_strict = warn_ambiguous_refs;
 740                                 if (arg) {
 741                                         if (!strcmp(arg, "strict"))
 742                                                 abbrev_ref_strict = 1;
 743                                         else if (!strcmp(arg, "loose"))
 744                                                 abbrev_ref_strict = 0;
 745                                         else
 746                                                 die("unknown mode for --abbrev-ref: %s",
 747                                                     arg);
 748                                 }
 749                                 continue;
 750                         }
 751                         if (!strcmp(arg, "--all")) {
 752                                 for_each_ref(show_reference, NULL);
 753                                 continue;
 754                         }
 755                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 756                                 for_each_abbrev(arg, show_abbrev, NULL);
 757                                 continue;
 758                         }
 759                         if (!strcmp(arg, "--bisect")) {
 760                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
 761                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
 762                                 continue;
 763                         }
 764                         if (opt_with_value(arg, "--branches", &arg)) {
 765                                 handle_ref_opt(arg, "refs/heads/");
 766                                 continue;
 767                         }
 768                         if (opt_with_value(arg, "--tags", &arg)) {
 769                                 handle_ref_opt(arg, "refs/tags/");
 770                                 continue;
 771                         }
 772                         if (skip_prefix(arg, "--glob=", &arg)) {
 773                                 handle_ref_opt(arg, NULL);
 774                                 continue;
 775                         }
 776                         if (opt_with_value(arg, "--remotes", &arg)) {
 777                                 handle_ref_opt(arg, "refs/remotes/");
 778                                 continue;
 779                         }
 780                         if (skip_prefix(arg, "--exclude=", &arg)) {
 781                                 add_ref_exclusion(&ref_excludes, arg);
 782                                 continue;
 783                         }
 784                         if (!strcmp(arg, "--show-toplevel")) {
 785                                 const char *work_tree = get_git_work_tree();
 786                                 if (work_tree)
 787                                         puts(work_tree);
 788                                 continue;
 789                         }
 790                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 791                                 const char *superproject = get_superproject_working_tree();
 792                                 if (superproject)
 793                                         puts(superproject);
 794                                 continue;
 795                         }
 796                         if (!strcmp(arg, "--show-prefix")) {
 797                                 if (prefix)
 798                                         puts(prefix);
 799                                 else
 800                                         putchar('\n');
 801                                 continue;
 802                         }
 803                         if (!strcmp(arg, "--show-cdup")) {
 804                                 const char *pfx = prefix;
 805                                 if (!is_inside_work_tree()) {
 806                                         const char *work_tree =
 807                                                 get_git_work_tree();
 808                                         if (work_tree)
 809                                                 printf("%s\n", work_tree);
 810                                         continue;
 811                                 }
 812                                 while (pfx) {
 813                                         pfx = strchr(pfx, '/');
 814                                         if (pfx) {
 815                                                 pfx++;
 816                                                 printf("../");
 817                                         }
 818                                 }
 819                                 putchar('\n');
 820                                 continue;
 821                         }
 822                         if (!strcmp(arg, "--git-dir") ||
 823                             !strcmp(arg, "--absolute-git-dir")) {
 824                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 825                                 char *cwd;
 826                                 int len;
 827                                 if (arg[2] == 'g') {    /* --git-dir */
 828                                         if (gitdir) {
 829                                                 puts(gitdir);
 830                                                 continue;
 831                                         }
 832                                         if (!prefix) {
 833                                                 puts(".git");
 834                                                 continue;
 835                                         }
 836                                 } else {                /* --absolute-git-dir */
 837                                         if (!gitdir && !prefix)
 838                                                 gitdir = ".git";
 839                                         if (gitdir) {
 840                                                 puts(real_path(gitdir));
 841                                                 continue;
 842                                         }
 843                                 }
 844                                 cwd = xgetcwd();
 845                                 len = strlen(cwd);
 846                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 847                                 free(cwd);
 848                                 continue;
 849                         }
 850                         if (!strcmp(arg, "--git-common-dir")) {
 851                                 strbuf_reset(&buf);
 852                                 puts(relative_path(get_git_common_dir(),
 853                                                    prefix, &buf));
 854                                 continue;
 855                         }
 856                         if (!strcmp(arg, "--is-inside-git-dir")) {
 857                                 printf("%s\n", is_inside_git_dir() ? "true"
 858                                                 : "false");
 859                                 continue;
 860                         }
 861                         if (!strcmp(arg, "--is-inside-work-tree")) {
 862                                 printf("%s\n", is_inside_work_tree() ? "true"
 863                                                 : "false");
 864                                 continue;
 865                         }
 866                         if (!strcmp(arg, "--is-bare-repository")) {
 867                                 printf("%s\n", is_bare_repository() ? "true"
 868                                                 : "false");
 869                                 continue;
 870                         }
 871                         if (!strcmp(arg, "--shared-index-path")) {
 872                                 if (read_cache() < 0)
 873                                         die(_("Could not read the index"));
 874                                 if (the_index.split_index) {
 875                                         const unsigned char *sha1 = the_index.split_index->base_sha1;
 876                                         const char *path = git_path("sharedindex.%s", sha1_to_hex(sha1));
 877                                         strbuf_reset(&buf);
 878                                         puts(relative_path(path, prefix, &buf));
 879                                 }
 880                                 continue;
 881                         }
 882                         if (skip_prefix(arg, "--since=", &arg)) {
 883                                 show_datestring("--max-age=", arg);
 884                                 continue;
 885                         }
 886                         if (skip_prefix(arg, "--after=", &arg)) {
 887                                 show_datestring("--max-age=", arg);
 888                                 continue;
 889                         }
 890                         if (skip_prefix(arg, "--before=", &arg)) {
 891                                 show_datestring("--min-age=", arg);
 892                                 continue;
 893                         }
 894                         if (skip_prefix(arg, "--until=", &arg)) {
 895                                 show_datestring("--min-age=", arg);
 896                                 continue;
 897                         }
 898                         if (show_flag(arg) && verify)
 899                                 die_no_single_rev(quiet);
 900                         continue;
 901                 }
 902
 903                 /* Not a flag argument */
 904                 if (try_difference(arg))
 905                         continue;
 906                 if (try_parent_shorthands(arg))
 907                         continue;
 908                 name = arg;
 909                 type = NORMAL;
 910                 if (*arg == '^') {
 911                         name++;
 912                         type = REVERSED;
 913                 }
 914                 if (!get_sha1_with_context(name, flags, oid.hash, &unused)) {
 915                         if (verify)
 916                                 revs_count++;
 917                         else
 918                                 show_rev(type, &oid, name);
 919                         continue;
 920                 }
 921                 if (verify)
 922                         die_no_single_rev(quiet);
 923                 if (has_dashdash)
 924                         die("bad revision '%s'", arg);
 925                 as_is = 1;
 926                 if (!show_file(arg, output_prefix))
 927                         continue;
 928                 verify_filename(prefix, arg, 1);
 929         }
 930         strbuf_release(&buf);
 931         if (verify) {
 932                 if (revs_count == 1) {
 933                         show_rev(type, &oid, name);
 934                         return 0;
 935                 } else if (revs_count == 0 && show_default())
 936                         return 0;
 937                 die_no_single_rev(quiet);
 938         } else
 939                 show_default();
 940         return 0;
 941 }