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, &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, 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 start_oid;
 247         struct object_id end_oid;
 248         const char *end;
 249         const char *start;
 250         int symmetric;
 251         static const char head_by_default[] = "HEAD";
 252
 253         if (!(dotdot = strstr(arg, "..")))
 254                 return 0;
 255         end = dotdot + 2;
 256         start = arg;
 257         symmetric = (*end == '.');
 258
 259         *dotdot = 0;
 260         end += symmetric;
 261
 262         if (!*end)
 263                 end = head_by_default;
 264         if (dotdot == arg)
 265                 start = head_by_default;
 266
 267         if (start == head_by_default && end == 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_oid_committish(start, &start_oid) && !get_oid_committish(end, &end_oid)) {
 278                 show_rev(NORMAL, &end_oid, end);
 279                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
 280                 if (symmetric) {
 281                         struct commit_list *exclude;
 282                         struct commit *a, *b;
 283                         a = lookup_commit_reference(&start_oid);
 284                         b = lookup_commit_reference(&end_oid);
 285                         if (!a || !b) {
 286                                 *dotdot = '.';
 287                                 return 0;
 288                         }
 289                         exclude = get_merge_bases(a, b);
 290                         while (exclude) {
 291                                 struct commit *commit = pop_commit(&exclude);
 292                                 show_rev(REVERSED, &commit->object.oid, NULL);
 293                         }
 294                 }
 295                 *dotdot = '.';
 296                 return 1;
 297         }
 298         *dotdot = '.';
 299         return 0;
 300 }
 301
 302 static int try_parent_shorthands(const char *arg)
 303 {
 304         char *dotdot;
 305         struct object_id oid;
 306         struct commit *commit;
 307         struct commit_list *parents;
 308         int parent_number;
 309         int include_rev = 0;
 310         int include_parents = 0;
 311         int exclude_parent = 0;
 312
 313         if ((dotdot = strstr(arg, "^!"))) {
 314                 include_rev = 1;
 315                 if (dotdot[2])
 316                         return 0;
 317         } else if ((dotdot = strstr(arg, "^@"))) {
 318                 include_parents = 1;
 319                 if (dotdot[2])
 320                         return 0;
 321         } else if ((dotdot = strstr(arg, "^-"))) {
 322                 include_rev = 1;
 323                 exclude_parent = 1;
 324
 325                 if (dotdot[2]) {
 326                         char *end;
 327                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 328                         if (*end != '\0' || !exclude_parent)
 329                                 return 0;
 330                 }
 331         } else
 332                 return 0;
 333
 334         *dotdot = 0;
 335         if (get_oid_committish(arg, &oid) ||
 336             !(commit = lookup_commit_reference(&oid))) {
 337                 *dotdot = '^';
 338                 return 0;
 339         }
 340
 341         if (exclude_parent &&
 342             exclude_parent > commit_list_count(commit->parents)) {
 343                 *dotdot = '^';
 344                 return 0;
 345         }
 346
 347         if (include_rev)
 348                 show_rev(NORMAL, &oid, arg);
 349         for (parents = commit->parents, parent_number = 1;
 350              parents;
 351              parents = parents->next, parent_number++) {
 352                 char *name = NULL;
 353
 354                 if (exclude_parent && parent_number != exclude_parent)
 355                         continue;
 356
 357                 if (symbolic)
 358                         name = xstrfmt("%s^%d", arg, parent_number);
 359                 show_rev(include_parents ? NORMAL : REVERSED,
 360                          &parents->item->object.oid, name);
 361                 free(name);
 362         }
 363
 364         *dotdot = '^';
 365         return 1;
 366 }
 367
 368 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 369 {
 370         struct strbuf *parsed = o->value;
 371         if (unset)
 372                 strbuf_addf(parsed, " --no-%s", o->long_name);
 373         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 374                 strbuf_addf(parsed, " -%c", o->short_name);
 375         else
 376                 strbuf_addf(parsed, " --%s", o->long_name);
 377         if (arg) {
 378                 if (!stuck_long)
 379                         strbuf_addch(parsed, ' ');
 380                 else if (o->long_name)
 381                         strbuf_addch(parsed, '=');
 382                 sq_quote_buf(parsed, arg);
 383         }
 384         return 0;
 385 }
 386
 387 static const char *skipspaces(const char *s)
 388 {
 389         while (isspace(*s))
 390                 s++;
 391         return s;
 392 }
 393
 394 static char *findspace(const char *s)
 395 {
 396         for (; *s; s++)
 397                 if (isspace(*s))
 398                         return (char*)s;
 399         return NULL;
 400 }
 401
 402 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 403 {
 404         static int keep_dashdash = 0, stop_at_non_option = 0;
 405         static char const * const parseopt_usage[] = {
 406                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 407                 NULL
 408         };
 409         static struct option parseopt_opts[] = {
 410                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 411                                         N_("keep the `--` passed as an arg")),
 412                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 413                                         N_("stop parsing after the "
 414                                            "first non-option argument")),
 415                 OPT_BOOL(0, "stuck-long", &stuck_long,
 416                                         N_("output in stuck long form")),
 417                 OPT_END(),
 418         };
 419         static const char * const flag_chars = "*=?!";
 420
 421         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 422         const char **usage = NULL;
 423         struct option *opts = NULL;
 424         int onb = 0, osz = 0, unb = 0, usz = 0;
 425
 426         strbuf_addstr(&parsed, "set --");
 427         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 428                              PARSE_OPT_KEEP_DASHDASH);
 429         if (argc < 1 || strcmp(argv[0], "--"))
 430                 usage_with_options(parseopt_usage, parseopt_opts);
 431
 432         /* get the usage up to the first line with a -- on it */
 433         for (;;) {
 434                 if (strbuf_getline(&sb, stdin) == EOF)
 435                         die("premature end of input");
 436                 ALLOC_GROW(usage, unb + 1, usz);
 437                 if (!strcmp("--", sb.buf)) {
 438                         if (unb < 1)
 439                                 die("no usage string given before the `--' separator");
 440                         usage[unb] = NULL;
 441                         break;
 442                 }
 443                 usage[unb++] = strbuf_detach(&sb, NULL);
 444         }
 445
 446         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 447         while (strbuf_getline(&sb, stdin) != EOF) {
 448                 const char *s;
 449                 char *help;
 450                 struct option *o;
 451
 452                 if (!sb.len)
 453                         continue;
 454
 455                 ALLOC_GROW(opts, onb + 1, osz);
 456                 memset(opts + onb, 0, sizeof(opts[onb]));
 457
 458                 o = &opts[onb++];
 459                 help = findspace(sb.buf);
 460                 if (!help || sb.buf == help) {
 461                         o->type = OPTION_GROUP;
 462                         o->help = xstrdup(skipspaces(sb.buf));
 463                         continue;
 464                 }
 465
 466                 *help = '\0';
 467
 468                 o->type = OPTION_CALLBACK;
 469                 o->help = xstrdup(skipspaces(help+1));
 470                 o->value = &parsed;
 471                 o->flags = PARSE_OPT_NOARG;
 472                 o->callback = &parseopt_dump;
 473
 474                 /* name(s) */
 475                 s = strpbrk(sb.buf, flag_chars);
 476                 if (s == NULL)
 477                         s = help;
 478
 479                 if (s - sb.buf == 1) /* short option only */
 480                         o->short_name = *sb.buf;
 481                 else if (sb.buf[1] != ',') /* long option only */
 482                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 483                 else {
 484                         o->short_name = *sb.buf;
 485                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 486                 }
 487
 488                 /* flags */
 489                 while (s < help) {
 490                         switch (*s++) {
 491                         case '=':
 492                                 o->flags &= ~PARSE_OPT_NOARG;
 493                                 continue;
 494                         case '?':
 495                                 o->flags &= ~PARSE_OPT_NOARG;
 496                                 o->flags |= PARSE_OPT_OPTARG;
 497                                 continue;
 498                         case '!':
 499                                 o->flags |= PARSE_OPT_NONEG;
 500                                 continue;
 501                         case '*':
 502                                 o->flags |= PARSE_OPT_HIDDEN;
 503                                 continue;
 504                         }
 505                         s--;
 506                         break;
 507                 }
 508
 509                 if (s < help)
 510                         o->argh = xmemdupz(s, help - s);
 511         }
 512         strbuf_release(&sb);
 513
 514         /* put an OPT_END() */
 515         ALLOC_GROW(opts, onb + 1, osz);
 516         memset(opts + onb, 0, sizeof(opts[onb]));
 517         argc = parse_options(argc, argv, prefix, opts, usage,
 518                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 519                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 520                         PARSE_OPT_SHELL_EVAL);
 521
 522         strbuf_addstr(&parsed, " --");
 523         sq_quote_argv(&parsed, argv);
 524         puts(parsed.buf);
 525         return 0;
 526 }
 527
 528 static int cmd_sq_quote(int argc, const char **argv)
 529 {
 530         struct strbuf buf = STRBUF_INIT;
 531
 532         if (argc)
 533                 sq_quote_argv(&buf, argv);
 534         printf("%s\n", buf.buf);
 535         strbuf_release(&buf);
 536
 537         return 0;
 538 }
 539
 540 static void die_no_single_rev(int quiet)
 541 {
 542         if (quiet)
 543                 exit(1);
 544         else
 545                 die("Needed a single revision");
 546 }
 547
 548 static const char builtin_rev_parse_usage[] =
 549 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 550    "   or: git rev-parse --sq-quote [<arg>...]\n"
 551    "   or: git rev-parse [<options>] [<arg>...]\n"
 552    "\n"
 553    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 554
 555 /*
 556  * Parse "opt" or "opt=<value>", setting value respectively to either
 557  * NULL or the string after "=".
 558  */
 559 static int opt_with_value(const char *arg, const char *opt, const char **value)
 560 {
 561         if (skip_prefix(arg, opt, &arg)) {
 562                 if (!*arg) {
 563                         *value = NULL;
 564                         return 1;
 565                 }
 566                 if (*arg++ == '=') {
 567                         *value = arg;
 568                         return 1;
 569                 }
 570         }
 571         return 0;
 572 }
 573
 574 static void handle_ref_opt(const char *pattern, const char *prefix)
 575 {
 576         if (pattern)
 577                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 578         else
 579                 for_each_ref_in(prefix, show_reference, NULL);
 580         clear_ref_exclusion(&ref_excludes);
 581 }
 582
 583 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 584 {
 585         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 586         int did_repo_setup = 0;
 587         int has_dashdash = 0;
 588         int output_prefix = 0;
 589         struct object_id oid;
 590         unsigned int flags = 0;
 591         const char *name = NULL;
 592         struct object_context unused;
 593         struct strbuf buf = STRBUF_INIT;
 594
 595         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 596                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 597
 598         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 599                 return cmd_sq_quote(argc - 2, argv + 2);
 600
 601         if (argc > 1 && !strcmp("-h", argv[1]))
 602                 usage(builtin_rev_parse_usage);
 603
 604         for (i = 1; i < argc; i++) {
 605                 if (!strcmp(argv[i], "--")) {
 606                         has_dashdash = 1;
 607                         break;
 608                 }
 609         }
 610
 611         /* No options; just report on whether we're in a git repo or not. */
 612         if (argc == 1) {
 613                 setup_git_directory();
 614                 git_config(git_default_config, NULL);
 615                 return 0;
 616         }
 617
 618         for (i = 1; i < argc; i++) {
 619                 const char *arg = argv[i];
 620
 621                 if (!strcmp(arg, "--local-env-vars")) {
 622                         int i;
 623                         for (i = 0; local_repo_env[i]; i++)
 624                                 printf("%s\n", local_repo_env[i]);
 625                         continue;
 626                 }
 627                 if (!strcmp(arg, "--resolve-git-dir")) {
 628                         const char *gitdir = argv[++i];
 629                         if (!gitdir)
 630                                 die("--resolve-git-dir requires an argument");
 631                         gitdir = resolve_gitdir(gitdir);
 632                         if (!gitdir)
 633                                 die("not a gitdir '%s'", argv[i]);
 634                         puts(gitdir);
 635                         continue;
 636                 }
 637
 638                 /* The rest of the options require a git repository. */
 639                 if (!did_repo_setup) {
 640                         prefix = setup_git_directory();
 641                         git_config(git_default_config, NULL);
 642                         did_repo_setup = 1;
 643                 }
 644
 645                 if (!strcmp(arg, "--git-path")) {
 646                         if (!argv[i + 1])
 647                                 die("--git-path requires an argument");
 648                         strbuf_reset(&buf);
 649                         puts(relative_path(git_path("%s", argv[i + 1]),
 650                                            prefix, &buf));
 651                         i++;
 652                         continue;
 653                 }
 654                 if (as_is) {
 655                         if (show_file(arg, output_prefix) && as_is < 2)
 656                                 verify_filename(prefix, arg, 0);
 657                         continue;
 658                 }
 659                 if (!strcmp(arg,"-n")) {
 660                         if (++i >= argc)
 661                                 die("-n requires an argument");
 662                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 663                                 show(arg);
 664                                 show(argv[i]);
 665                         }
 666                         continue;
 667                 }
 668                 if (starts_with(arg, "-n")) {
 669                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 670                                 show(arg);
 671                         continue;
 672                 }
 673
 674                 if (*arg == '-') {
 675                         if (!strcmp(arg, "--")) {
 676                                 as_is = 2;
 677                                 /* Pass on the "--" if we show anything but files.. */
 678                                 if (filter & (DO_FLAGS | DO_REVS))
 679                                         show_file(arg, 0);
 680                                 continue;
 681                         }
 682                         if (!strcmp(arg, "--default")) {
 683                                 def = argv[++i];
 684                                 if (!def)
 685                                         die("--default requires an argument");
 686                                 continue;
 687                         }
 688                         if (!strcmp(arg, "--prefix")) {
 689                                 prefix = argv[++i];
 690                                 if (!prefix)
 691                                         die("--prefix requires an argument");
 692                                 startup_info->prefix = prefix;
 693                                 output_prefix = 1;
 694                                 continue;
 695                         }
 696                         if (!strcmp(arg, "--revs-only")) {
 697                                 filter &= ~DO_NOREV;
 698                                 continue;
 699                         }
 700                         if (!strcmp(arg, "--no-revs")) {
 701                                 filter &= ~DO_REVS;
 702                                 continue;
 703                         }
 704                         if (!strcmp(arg, "--flags")) {
 705                                 filter &= ~DO_NONFLAGS;
 706                                 continue;
 707                         }
 708                         if (!strcmp(arg, "--no-flags")) {
 709                                 filter &= ~DO_FLAGS;
 710                                 continue;
 711                         }
 712                         if (!strcmp(arg, "--verify")) {
 713                                 filter &= ~(DO_FLAGS|DO_NOREV);
 714                                 verify = 1;
 715                                 continue;
 716                         }
 717                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 718                                 quiet = 1;
 719                                 flags |= GET_OID_QUIETLY;
 720                                 continue;
 721                         }
 722                         if (opt_with_value(arg, "--short", &arg)) {
 723                                 filter &= ~(DO_FLAGS|DO_NOREV);
 724                                 verify = 1;
 725                                 abbrev = DEFAULT_ABBREV;
 726                                 if (!arg)
 727                                         continue;
 728                                 abbrev = strtoul(arg, NULL, 10);
 729                                 if (abbrev < MINIMUM_ABBREV)
 730                                         abbrev = MINIMUM_ABBREV;
 731                                 else if (40 <= abbrev)
 732                                         abbrev = 40;
 733                                 continue;
 734                         }
 735                         if (!strcmp(arg, "--sq")) {
 736                                 output_sq = 1;
 737                                 continue;
 738                         }
 739                         if (!strcmp(arg, "--not")) {
 740                                 show_type ^= REVERSED;
 741                                 continue;
 742                         }
 743                         if (!strcmp(arg, "--symbolic")) {
 744                                 symbolic = SHOW_SYMBOLIC_ASIS;
 745                                 continue;
 746                         }
 747                         if (!strcmp(arg, "--symbolic-full-name")) {
 748                                 symbolic = SHOW_SYMBOLIC_FULL;
 749                                 continue;
 750                         }
 751                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 752                                 abbrev_ref = 1;
 753                                 abbrev_ref_strict = warn_ambiguous_refs;
 754                                 if (arg) {
 755                                         if (!strcmp(arg, "strict"))
 756                                                 abbrev_ref_strict = 1;
 757                                         else if (!strcmp(arg, "loose"))
 758                                                 abbrev_ref_strict = 0;
 759                                         else
 760                                                 die("unknown mode for --abbrev-ref: %s",
 761                                                     arg);
 762                                 }
 763                                 continue;
 764                         }
 765                         if (!strcmp(arg, "--all")) {
 766                                 for_each_ref(show_reference, NULL);
 767                                 continue;
 768                         }
 769                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 770                                 for_each_abbrev(arg, show_abbrev, NULL);
 771                                 continue;
 772                         }
 773                         if (!strcmp(arg, "--bisect")) {
 774                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
 775                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
 776                                 continue;
 777                         }
 778                         if (opt_with_value(arg, "--branches", &arg)) {
 779                                 handle_ref_opt(arg, "refs/heads/");
 780                                 continue;
 781                         }
 782                         if (opt_with_value(arg, "--tags", &arg)) {
 783                                 handle_ref_opt(arg, "refs/tags/");
 784                                 continue;
 785                         }
 786                         if (skip_prefix(arg, "--glob=", &arg)) {
 787                                 handle_ref_opt(arg, NULL);
 788                                 continue;
 789                         }
 790                         if (opt_with_value(arg, "--remotes", &arg)) {
 791                                 handle_ref_opt(arg, "refs/remotes/");
 792                                 continue;
 793                         }
 794                         if (skip_prefix(arg, "--exclude=", &arg)) {
 795                                 add_ref_exclusion(&ref_excludes, arg);
 796                                 continue;
 797                         }
 798                         if (!strcmp(arg, "--show-toplevel")) {
 799                                 const char *work_tree = get_git_work_tree();
 800                                 if (work_tree)
 801                                         puts(work_tree);
 802                                 continue;
 803                         }
 804                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 805                                 const char *superproject = get_superproject_working_tree();
 806                                 if (superproject)
 807                                         puts(superproject);
 808                                 continue;
 809                         }
 810                         if (!strcmp(arg, "--show-prefix")) {
 811                                 if (prefix)
 812                                         puts(prefix);
 813                                 else
 814                                         putchar('\n');
 815                                 continue;
 816                         }
 817                         if (!strcmp(arg, "--show-cdup")) {
 818                                 const char *pfx = prefix;
 819                                 if (!is_inside_work_tree()) {
 820                                         const char *work_tree =
 821                                                 get_git_work_tree();
 822                                         if (work_tree)
 823                                                 printf("%s\n", work_tree);
 824                                         continue;
 825                                 }
 826                                 while (pfx) {
 827                                         pfx = strchr(pfx, '/');
 828                                         if (pfx) {
 829                                                 pfx++;
 830                                                 printf("../");
 831                                         }
 832                                 }
 833                                 putchar('\n');
 834                                 continue;
 835                         }
 836                         if (!strcmp(arg, "--git-dir") ||
 837                             !strcmp(arg, "--absolute-git-dir")) {
 838                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 839                                 char *cwd;
 840                                 int len;
 841                                 if (arg[2] == 'g') {    /* --git-dir */
 842                                         if (gitdir) {
 843                                                 puts(gitdir);
 844                                                 continue;
 845                                         }
 846                                         if (!prefix) {
 847                                                 puts(".git");
 848                                                 continue;
 849                                         }
 850                                 } else {                /* --absolute-git-dir */
 851                                         if (!gitdir && !prefix)
 852                                                 gitdir = ".git";
 853                                         if (gitdir) {
 854                                                 puts(real_path(gitdir));
 855                                                 continue;
 856                                         }
 857                                 }
 858                                 cwd = xgetcwd();
 859                                 len = strlen(cwd);
 860                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 861                                 free(cwd);
 862                                 continue;
 863                         }
 864                         if (!strcmp(arg, "--git-common-dir")) {
 865                                 strbuf_reset(&buf);
 866                                 puts(relative_path(get_git_common_dir(),
 867                                                    prefix, &buf));
 868                                 continue;
 869                         }
 870                         if (!strcmp(arg, "--is-inside-git-dir")) {
 871                                 printf("%s\n", is_inside_git_dir() ? "true"
 872                                                 : "false");
 873                                 continue;
 874                         }
 875                         if (!strcmp(arg, "--is-inside-work-tree")) {
 876                                 printf("%s\n", is_inside_work_tree() ? "true"
 877                                                 : "false");
 878                                 continue;
 879                         }
 880                         if (!strcmp(arg, "--is-bare-repository")) {
 881                                 printf("%s\n", is_bare_repository() ? "true"
 882                                                 : "false");
 883                                 continue;
 884                         }
 885                         if (!strcmp(arg, "--is-shallow-repository")) {
 886                                 printf("%s\n", is_repository_shallow() ? "true"
 887                                                 : "false");
 888                                 continue;
 889                         }
 890                         if (!strcmp(arg, "--shared-index-path")) {
 891                                 if (read_cache() < 0)
 892                                         die(_("Could not read the index"));
 893                                 if (the_index.split_index) {
 894                                         const struct object_id *oid = &the_index.split_index->base_oid;
 895                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
 896                                         strbuf_reset(&buf);
 897                                         puts(relative_path(path, prefix, &buf));
 898                                 }
 899                                 continue;
 900                         }
 901                         if (skip_prefix(arg, "--since=", &arg)) {
 902                                 show_datestring("--max-age=", arg);
 903                                 continue;
 904                         }
 905                         if (skip_prefix(arg, "--after=", &arg)) {
 906                                 show_datestring("--max-age=", arg);
 907                                 continue;
 908                         }
 909                         if (skip_prefix(arg, "--before=", &arg)) {
 910                                 show_datestring("--min-age=", arg);
 911                                 continue;
 912                         }
 913                         if (skip_prefix(arg, "--until=", &arg)) {
 914                                 show_datestring("--min-age=", arg);
 915                                 continue;
 916                         }
 917                         if (show_flag(arg) && verify)
 918                                 die_no_single_rev(quiet);
 919                         continue;
 920                 }
 921
 922                 /* Not a flag argument */
 923                 if (try_difference(arg))
 924                         continue;
 925                 if (try_parent_shorthands(arg))
 926                         continue;
 927                 name = arg;
 928                 type = NORMAL;
 929                 if (*arg == '^') {
 930                         name++;
 931                         type = REVERSED;
 932                 }
 933                 if (!get_oid_with_context(name, flags, &oid, &unused)) {
 934                         if (verify)
 935                                 revs_count++;
 936                         else
 937                                 show_rev(type, &oid, name);
 938                         continue;
 939                 }
 940                 if (verify)
 941                         die_no_single_rev(quiet);
 942                 if (has_dashdash)
 943                         die("bad revision '%s'", arg);
 944                 as_is = 1;
 945                 if (!show_file(arg, output_prefix))
 946                         continue;
 947                 verify_filename(prefix, arg, 1);
 948         }
 949         strbuf_release(&buf);
 950         if (verify) {
 951                 if (revs_count == 1) {
 952                         show_rev(type, &oid, name);
 953                         return 0;
 954                 } else if (revs_count == 0 && show_default())
 955                         return 0;
 956                 die_no_single_rev(quiet);
 957         } else
 958                 show_default();
 959         return 0;
 960 }