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