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   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   7 #include "cache.h"
   8 #include "config.h"
   9 #include "commit.h"
  10 #include "refs.h"
  11 #include "quote.h"
  12 #include "builtin.h"
  13 #include "parse-options.h"
  14 #include "diff.h"
  15 #include "revision.h"
  16 #include "split-index.h"
  17 #include "submodule.h"
  18 #include "commit-reach.h"
  19
  20 #define DO_REVS         1
  21 #define DO_NOREV        2
  22 #define DO_FLAGS        4
  23 #define DO_NONFLAGS     8
  24 static int filter = ~0;
  25
  26 static const char *def;
  27
  28 #define NORMAL 0
  29 #define REVERSED 1
  30 static int show_type = NORMAL;
  31
  32 #define SHOW_SYMBOLIC_ASIS 1
  33 #define SHOW_SYMBOLIC_FULL 2
  34 static int symbolic;
  35 static int abbrev;
  36 static int abbrev_ref;
  37 static int abbrev_ref_strict;
  38 static int output_sq;
  39
  40 static int stuck_long;
  41 static struct string_list *ref_excludes;
  42
  43 /*
  44  * Some arguments are relevant "revision" arguments,
  45  * others are about output format or other details.
  46  * This sorts it all out.
  47  */
  48 static int is_rev_argument(const char *arg)
  49 {
  50         static const char *rev_args[] = {
  51                 "--all",
  52                 "--bisect",
  53                 "--dense",
  54                 "--branches=",
  55                 "--branches",
  56                 "--header",
  57                 "--ignore-missing",
  58                 "--max-age=",
  59                 "--max-count=",
  60                 "--min-age=",
  61                 "--no-merges",
  62                 "--min-parents=",
  63                 "--no-min-parents",
  64                 "--max-parents=",
  65                 "--no-max-parents",
  66                 "--objects",
  67                 "--objects-edge",
  68                 "--parents",
  69                 "--pretty",
  70                 "--remotes=",
  71                 "--remotes",
  72                 "--glob=",
  73                 "--sparse",
  74                 "--tags=",
  75                 "--tags",
  76                 "--topo-order",
  77                 "--date-order",
  78                 "--unpacked",
  79                 NULL
  80         };
  81         const char **p = rev_args;
  82
  83         /* accept -<digit>, like traditional "head" */
  84         if ((*arg == '-') && isdigit(arg[1]))
  85                 return 1;
  86
  87         for (;;) {
  88                 const char *str = *p++;
  89                 int len;
  90                 if (!str)
  91                         return 0;
  92                 len = strlen(str);
  93                 if (!strcmp(arg, str) ||
  94                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  95                         return 1;
  96         }
  97 }
  98
  99 /* Output argument as a string, either SQ or normal */
 100 static void show(const char *arg)
 101 {
 102         if (output_sq) {
 103                 int sq = '\'', ch;
 104
 105                 putchar(sq);
 106                 while ((ch = *arg++)) {
 107                         if (ch == sq)
 108                                 fputs("'\\'", stdout);
 109                         putchar(ch);
 110                 }
 111                 putchar(sq);
 112                 putchar(' ');
 113         }
 114         else
 115                 puts(arg);
 116 }
 117
 118 /* Like show(), but with a negation prefix according to type */
 119 static void show_with_type(int type, const char *arg)
 120 {
 121         if (type != show_type)
 122                 putchar('^');
 123         show(arg);
 124 }
 125
 126 /* Output a revision, only if filter allows it */
 127 static void show_rev(int type, const struct object_id *oid, const char *name)
 128 {
 129         if (!(filter & DO_REVS))
 130                 return;
 131         def = NULL;
 132
 133         if ((symbolic || abbrev_ref) && name) {
 134                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 135                         struct object_id discard;
 136                         char *full;
 137
 138                         switch (dwim_ref(name, strlen(name), &discard, &full)) {
 139                         case 0:
 140                                 /*
 141                                  * Not found -- not a ref.  We could
 142                                  * emit "name" here, but symbolic-full
 143                                  * users are interested in finding the
 144                                  * refs spelled in full, and they would
 145                                  * need to filter non-refs if we did so.
 146                                  */
 147                                 break;
 148                         case 1: /* happy */
 149                                 if (abbrev_ref)
 150                                         full = shorten_unambiguous_ref(full,
 151                                                 abbrev_ref_strict);
 152                                 show_with_type(type, full);
 153                                 break;
 154                         default: /* ambiguous */
 155                                 error("refname '%s' is ambiguous", name);
 156                                 break;
 157                         }
 158                         free(full);
 159                 } else {
 160                         show_with_type(type, name);
 161                 }
 162         }
 163         else if (abbrev)
 164                 show_with_type(type, find_unique_abbrev(oid, abbrev));
 165         else
 166                 show_with_type(type, oid_to_hex(oid));
 167 }
 168
 169 /* Output a flag, only if filter allows it. */
 170 static int show_flag(const char *arg)
 171 {
 172         if (!(filter & DO_FLAGS))
 173                 return 0;
 174         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 175                 show(arg);
 176                 return 1;
 177         }
 178         return 0;
 179 }
 180
 181 static int show_default(void)
 182 {
 183         const char *s = def;
 184
 185         if (s) {
 186                 struct object_id oid;
 187
 188                 def = NULL;
 189                 if (!get_oid(s, &oid)) {
 190                         show_rev(NORMAL, &oid, s);
 191                         return 1;
 192                 }
 193         }
 194         return 0;
 195 }
 196
 197 static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 198 {
 199         if (ref_excluded(ref_excludes, refname))
 200                 return 0;
 201         show_rev(NORMAL, oid, refname);
 202         return 0;
 203 }
 204
 205 static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 206 {
 207         show_rev(REVERSED, oid, refname);
 208         return 0;
 209 }
 210
 211 static int show_abbrev(const struct object_id *oid, void *cb_data)
 212 {
 213         show_rev(NORMAL, oid, NULL);
 214         return 0;
 215 }
 216
 217 static void show_datestring(const char *flag, const char *datestr)
 218 {
 219         char *buffer;
 220
 221         /* date handling requires both flags and revs */
 222         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 223                 return;
 224         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
 225         show(buffer);
 226         free(buffer);
 227 }
 228
 229 static int show_file(const char *arg, int output_prefix)
 230 {
 231         show_default();
 232         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 233                 if (output_prefix) {
 234                         const char *prefix = startup_info->prefix;
 235                         char *fname = prefix_filename(prefix, arg);
 236                         show(fname);
 237                         free(fname);
 238                 } else
 239                         show(arg);
 240                 return 1;
 241         }
 242         return 0;
 243 }
 244
 245 static int try_difference(const char *arg)
 246 {
 247         char *dotdot;
 248         struct object_id start_oid;
 249         struct object_id end_oid;
 250         const char *end;
 251         const char *start;
 252         int symmetric;
 253         static const char head_by_default[] = "HEAD";
 254
 255         if (!(dotdot = strstr(arg, "..")))
 256                 return 0;
 257         end = dotdot + 2;
 258         start = arg;
 259         symmetric = (*end == '.');
 260
 261         *dotdot = 0;
 262         end += symmetric;
 263
 264         if (!*end)
 265                 end = head_by_default;
 266         if (dotdot == arg)
 267                 start = head_by_default;
 268
 269         if (start == head_by_default && end == head_by_default &&
 270             !symmetric) {
 271                 /*
 272                  * Just ".."?  That is not a range but the
 273                  * pathspec for the parent directory.
 274                  */
 275                 *dotdot = '.';
 276                 return 0;
 277         }
 278
 279         if (!get_oid_committish(start, &start_oid) && !get_oid_committish(end, &end_oid)) {
 280                 show_rev(NORMAL, &end_oid, end);
 281                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
 282                 if (symmetric) {
 283                         struct commit_list *exclude;
 284                         struct commit *a, *b;
 285                         a = lookup_commit_reference(the_repository, &start_oid);
 286                         b = lookup_commit_reference(the_repository, &end_oid);
 287                         if (!a || !b) {
 288                                 *dotdot = '.';
 289                                 return 0;
 290                         }
 291                         exclude = get_merge_bases(a, b);
 292                         while (exclude) {
 293                                 struct commit *commit = pop_commit(&exclude);
 294                                 show_rev(REVERSED, &commit->object.oid, NULL);
 295                         }
 296                 }
 297                 *dotdot = '.';
 298                 return 1;
 299         }
 300         *dotdot = '.';
 301         return 0;
 302 }
 303
 304 static int try_parent_shorthands(const char *arg)
 305 {
 306         char *dotdot;
 307         struct object_id oid;
 308         struct commit *commit;
 309         struct commit_list *parents;
 310         int parent_number;
 311         int include_rev = 0;
 312         int include_parents = 0;
 313         int exclude_parent = 0;
 314
 315         if ((dotdot = strstr(arg, "^!"))) {
 316                 include_rev = 1;
 317                 if (dotdot[2])
 318                         return 0;
 319         } else if ((dotdot = strstr(arg, "^@"))) {
 320                 include_parents = 1;
 321                 if (dotdot[2])
 322                         return 0;
 323         } else if ((dotdot = strstr(arg, "^-"))) {
 324                 include_rev = 1;
 325                 exclude_parent = 1;
 326
 327                 if (dotdot[2]) {
 328                         char *end;
 329                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 330                         if (*end != '\0' || !exclude_parent)
 331                                 return 0;
 332                 }
 333         } else
 334                 return 0;
 335
 336         *dotdot = 0;
 337         if (get_oid_committish(arg, &oid) ||
 338             !(commit = lookup_commit_reference(the_repository, &oid))) {
 339                 *dotdot = '^';
 340                 return 0;
 341         }
 342
 343         if (exclude_parent &&
 344             exclude_parent > commit_list_count(commit->parents)) {
 345                 *dotdot = '^';
 346                 return 0;
 347         }
 348
 349         if (include_rev)
 350                 show_rev(NORMAL, &oid, arg);
 351         for (parents = commit->parents, parent_number = 1;
 352              parents;
 353              parents = parents->next, parent_number++) {
 354                 char *name = NULL;
 355
 356                 if (exclude_parent && parent_number != exclude_parent)
 357                         continue;
 358
 359                 if (symbolic)
 360                         name = xstrfmt("%s^%d", arg, parent_number);
 361                 show_rev(include_parents ? NORMAL : REVERSED,
 362                          &parents->item->object.oid, name);
 363                 free(name);
 364         }
 365
 366         *dotdot = '^';
 367         return 1;
 368 }
 369
 370 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 371 {
 372         struct strbuf *parsed = o->value;
 373         if (unset)
 374                 strbuf_addf(parsed, " --no-%s", o->long_name);
 375         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 376                 strbuf_addf(parsed, " -%c", o->short_name);
 377         else
 378                 strbuf_addf(parsed, " --%s", o->long_name);
 379         if (arg) {
 380                 if (!stuck_long)
 381                         strbuf_addch(parsed, ' ');
 382                 else if (o->long_name)
 383                         strbuf_addch(parsed, '=');
 384                 sq_quote_buf(parsed, arg);
 385         }
 386         return 0;
 387 }
 388
 389 static const char *skipspaces(const char *s)
 390 {
 391         while (isspace(*s))
 392                 s++;
 393         return s;
 394 }
 395
 396 static char *findspace(const char *s)
 397 {
 398         for (; *s; s++)
 399                 if (isspace(*s))
 400                         return (char*)s;
 401         return NULL;
 402 }
 403
 404 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 405 {
 406         static int keep_dashdash = 0, stop_at_non_option = 0;
 407         static char const * const parseopt_usage[] = {
 408                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 409                 NULL
 410         };
 411         static struct option parseopt_opts[] = {
 412                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 413                                         N_("keep the `--` passed as an arg")),
 414                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 415                                         N_("stop parsing after the "
 416                                            "first non-option argument")),
 417                 OPT_BOOL(0, "stuck-long", &stuck_long,
 418                                         N_("output in stuck long form")),
 419                 OPT_END(),
 420         };
 421         static const char * const flag_chars = "*=?!";
 422
 423         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 424         const char **usage = NULL;
 425         struct option *opts = NULL;
 426         int onb = 0, osz = 0, unb = 0, usz = 0;
 427
 428         strbuf_addstr(&parsed, "set --");
 429         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 430                              PARSE_OPT_KEEP_DASHDASH);
 431         if (argc < 1 || strcmp(argv[0], "--"))
 432                 usage_with_options(parseopt_usage, parseopt_opts);
 433
 434         /* get the usage up to the first line with a -- on it */
 435         for (;;) {
 436                 if (strbuf_getline(&sb, stdin) == EOF)
 437                         die("premature end of input");
 438                 ALLOC_GROW(usage, unb + 1, usz);
 439                 if (!strcmp("--", sb.buf)) {
 440                         if (unb < 1)
 441                                 die("no usage string given before the `--' separator");
 442                         usage[unb] = NULL;
 443                         break;
 444                 }
 445                 usage[unb++] = strbuf_detach(&sb, NULL);
 446         }
 447
 448         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 449         while (strbuf_getline(&sb, stdin) != EOF) {
 450                 const char *s;
 451                 char *help;
 452                 struct option *o;
 453
 454                 if (!sb.len)
 455                         continue;
 456
 457                 ALLOC_GROW(opts, onb + 1, osz);
 458                 memset(opts + onb, 0, sizeof(opts[onb]));
 459
 460                 o = &opts[onb++];
 461                 help = findspace(sb.buf);
 462                 if (!help || sb.buf == help) {
 463                         o->type = OPTION_GROUP;
 464                         o->help = xstrdup(skipspaces(sb.buf));
 465                         continue;
 466                 }
 467
 468                 *help = '\0';
 469
 470                 o->type = OPTION_CALLBACK;
 471                 o->help = xstrdup(skipspaces(help+1));
 472                 o->value = &parsed;
 473                 o->flags = PARSE_OPT_NOARG;
 474                 o->callback = &parseopt_dump;
 475
 476                 /* name(s) */
 477                 s = strpbrk(sb.buf, flag_chars);
 478                 if (s == NULL)
 479                         s = help;
 480
 481                 if (s - sb.buf == 1) /* short option only */
 482                         o->short_name = *sb.buf;
 483                 else if (sb.buf[1] != ',') /* long option only */
 484                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 485                 else {
 486                         o->short_name = *sb.buf;
 487                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 488                 }
 489
 490                 /* flags */
 491                 while (s < help) {
 492                         switch (*s++) {
 493                         case '=':
 494                                 o->flags &= ~PARSE_OPT_NOARG;
 495                                 continue;
 496                         case '?':
 497                                 o->flags &= ~PARSE_OPT_NOARG;
 498                                 o->flags |= PARSE_OPT_OPTARG;
 499                                 continue;
 500                         case '!':
 501                                 o->flags |= PARSE_OPT_NONEG;
 502                                 continue;
 503                         case '*':
 504                                 o->flags |= PARSE_OPT_HIDDEN;
 505                                 continue;
 506                         }
 507                         s--;
 508                         break;
 509                 }
 510
 511                 if (s < help)
 512                         o->argh = xmemdupz(s, help - s);
 513         }
 514         strbuf_release(&sb);
 515
 516         /* put an OPT_END() */
 517         ALLOC_GROW(opts, onb + 1, osz);
 518         memset(opts + onb, 0, sizeof(opts[onb]));
 519         argc = parse_options(argc, argv, prefix, opts, usage,
 520                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 521                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 522                         PARSE_OPT_SHELL_EVAL);
 523
 524         strbuf_addstr(&parsed, " --");
 525         sq_quote_argv(&parsed, argv);
 526         puts(parsed.buf);
 527         return 0;
 528 }
 529
 530 static int cmd_sq_quote(int argc, const char **argv)
 531 {
 532         struct strbuf buf = STRBUF_INIT;
 533
 534         if (argc)
 535                 sq_quote_argv(&buf, argv);
 536         printf("%s\n", buf.buf);
 537         strbuf_release(&buf);
 538
 539         return 0;
 540 }
 541
 542 static void die_no_single_rev(int quiet)
 543 {
 544         if (quiet)
 545                 exit(1);
 546         else
 547                 die("Needed a single revision");
 548 }
 549
 550 static const char builtin_rev_parse_usage[] =
 551 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 552    "   or: git rev-parse --sq-quote [<arg>...]\n"
 553    "   or: git rev-parse [<options>] [<arg>...]\n"
 554    "\n"
 555    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 556
 557 /*
 558  * Parse "opt" or "opt=<value>", setting value respectively to either
 559  * NULL or the string after "=".
 560  */
 561 static int opt_with_value(const char *arg, const char *opt, const char **value)
 562 {
 563         if (skip_prefix(arg, opt, &arg)) {
 564                 if (!*arg) {
 565                         *value = NULL;
 566                         return 1;
 567                 }
 568                 if (*arg++ == '=') {
 569                         *value = arg;
 570                         return 1;
 571                 }
 572         }
 573         return 0;
 574 }
 575
 576 static void handle_ref_opt(const char *pattern, const char *prefix)
 577 {
 578         if (pattern)
 579                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 580         else
 581                 for_each_ref_in(prefix, show_reference, NULL);
 582         clear_ref_exclusion(&ref_excludes);
 583 }
 584
 585 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 586 {
 587         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 588         int did_repo_setup = 0;
 589         int has_dashdash = 0;
 590         int output_prefix = 0;
 591         struct object_id oid;
 592         unsigned int flags = 0;
 593         const char *name = NULL;
 594         struct object_context unused;
 595         struct strbuf buf = STRBUF_INIT;
 596
 597         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 598                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 599
 600         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 601                 return cmd_sq_quote(argc - 2, argv + 2);
 602
 603         if (argc > 1 && !strcmp("-h", argv[1]))
 604                 usage(builtin_rev_parse_usage);
 605
 606         for (i = 1; i < argc; i++) {
 607                 if (!strcmp(argv[i], "--")) {
 608                         has_dashdash = 1;
 609                         break;
 610                 }
 611         }
 612
 613         /* No options; just report on whether we're in a git repo or not. */
 614         if (argc == 1) {
 615                 setup_git_directory();
 616                 git_config(git_default_config, NULL);
 617                 return 0;
 618         }
 619
 620         for (i = 1; i < argc; i++) {
 621                 const char *arg = argv[i];
 622
 623                 if (!strcmp(arg, "--local-env-vars")) {
 624                         int i;
 625                         for (i = 0; local_repo_env[i]; i++)
 626                                 printf("%s\n", local_repo_env[i]);
 627                         continue;
 628                 }
 629                 if (!strcmp(arg, "--resolve-git-dir")) {
 630                         const char *gitdir = argv[++i];
 631                         if (!gitdir)
 632                                 die("--resolve-git-dir requires an argument");
 633                         gitdir = resolve_gitdir(gitdir);
 634                         if (!gitdir)
 635                                 die("not a gitdir '%s'", argv[i]);
 636                         puts(gitdir);
 637                         continue;
 638                 }
 639
 640                 /* The rest of the options require a git repository. */
 641                 if (!did_repo_setup) {
 642                         prefix = setup_git_directory();
 643                         git_config(git_default_config, NULL);
 644                         did_repo_setup = 1;
 645                 }
 646
 647                 if (!strcmp(arg, "--git-path")) {
 648                         if (!argv[i + 1])
 649                                 die("--git-path requires an argument");
 650                         strbuf_reset(&buf);
 651                         puts(relative_path(git_path("%s", argv[i + 1]),
 652                                            prefix, &buf));
 653                         i++;
 654                         continue;
 655                 }
 656                 if (as_is) {
 657                         if (show_file(arg, output_prefix) && as_is < 2)
 658                                 verify_filename(prefix, arg, 0);
 659                         continue;
 660                 }
 661                 if (!strcmp(arg,"-n")) {
 662                         if (++i >= argc)
 663                                 die("-n requires an argument");
 664                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 665                                 show(arg);
 666                                 show(argv[i]);
 667                         }
 668                         continue;
 669                 }
 670                 if (starts_with(arg, "-n")) {
 671                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 672                                 show(arg);
 673                         continue;
 674                 }
 675
 676                 if (*arg == '-') {
 677                         if (!strcmp(arg, "--")) {
 678                                 as_is = 2;
 679                                 /* Pass on the "--" if we show anything but files.. */
 680                                 if (filter & (DO_FLAGS | DO_REVS))
 681                                         show_file(arg, 0);
 682                                 continue;
 683                         }
 684                         if (!strcmp(arg, "--default")) {
 685                                 def = argv[++i];
 686                                 if (!def)
 687                                         die("--default requires an argument");
 688                                 continue;
 689                         }
 690                         if (!strcmp(arg, "--prefix")) {
 691                                 prefix = argv[++i];
 692                                 if (!prefix)
 693                                         die("--prefix requires an argument");
 694                                 startup_info->prefix = prefix;
 695                                 output_prefix = 1;
 696                                 continue;
 697                         }
 698                         if (!strcmp(arg, "--revs-only")) {
 699                                 filter &= ~DO_NOREV;
 700                                 continue;
 701                         }
 702                         if (!strcmp(arg, "--no-revs")) {
 703                                 filter &= ~DO_REVS;
 704                                 continue;
 705                         }
 706                         if (!strcmp(arg, "--flags")) {
 707                                 filter &= ~DO_NONFLAGS;
 708                                 continue;
 709                         }
 710                         if (!strcmp(arg, "--no-flags")) {
 711                                 filter &= ~DO_FLAGS;
 712                                 continue;
 713                         }
 714                         if (!strcmp(arg, "--verify")) {
 715                                 filter &= ~(DO_FLAGS|DO_NOREV);
 716                                 verify = 1;
 717                                 continue;
 718                         }
 719                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 720                                 quiet = 1;
 721                                 flags |= GET_OID_QUIETLY;
 722                                 continue;
 723                         }
 724                         if (opt_with_value(arg, "--short", &arg)) {
 725                                 filter &= ~(DO_FLAGS|DO_NOREV);
 726                                 verify = 1;
 727                                 abbrev = DEFAULT_ABBREV;
 728                                 if (!arg)
 729                                         continue;
 730                                 abbrev = strtoul(arg, NULL, 10);
 731                                 if (abbrev < MINIMUM_ABBREV)
 732                                         abbrev = MINIMUM_ABBREV;
 733                                 else if (40 <= abbrev)
 734                                         abbrev = 40;
 735                                 continue;
 736                         }
 737                         if (!strcmp(arg, "--sq")) {
 738                                 output_sq = 1;
 739                                 continue;
 740                         }
 741                         if (!strcmp(arg, "--not")) {
 742                                 show_type ^= REVERSED;
 743                                 continue;
 744                         }
 745                         if (!strcmp(arg, "--symbolic")) {
 746                                 symbolic = SHOW_SYMBOLIC_ASIS;
 747                                 continue;
 748                         }
 749                         if (!strcmp(arg, "--symbolic-full-name")) {
 750                                 symbolic = SHOW_SYMBOLIC_FULL;
 751                                 continue;
 752                         }
 753                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 754                                 abbrev_ref = 1;
 755                                 abbrev_ref_strict = warn_ambiguous_refs;
 756                                 if (arg) {
 757                                         if (!strcmp(arg, "strict"))
 758                                                 abbrev_ref_strict = 1;
 759                                         else if (!strcmp(arg, "loose"))
 760                                                 abbrev_ref_strict = 0;
 761                                         else
 762                                                 die("unknown mode for --abbrev-ref: %s",
 763                                                     arg);
 764                                 }
 765                                 continue;
 766                         }
 767                         if (!strcmp(arg, "--all")) {
 768                                 for_each_ref(show_reference, NULL);
 769                                 clear_ref_exclusion(&ref_excludes);
 770                                 continue;
 771                         }
 772                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 773                                 for_each_abbrev(arg, show_abbrev, NULL);
 774                                 continue;
 775                         }
 776                         if (!strcmp(arg, "--bisect")) {
 777                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
 778                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
 779                                 continue;
 780                         }
 781                         if (opt_with_value(arg, "--branches", &arg)) {
 782                                 handle_ref_opt(arg, "refs/heads/");
 783                                 continue;
 784                         }
 785                         if (opt_with_value(arg, "--tags", &arg)) {
 786                                 handle_ref_opt(arg, "refs/tags/");
 787                                 continue;
 788                         }
 789                         if (skip_prefix(arg, "--glob=", &arg)) {
 790                                 handle_ref_opt(arg, NULL);
 791                                 continue;
 792                         }
 793                         if (opt_with_value(arg, "--remotes", &arg)) {
 794                                 handle_ref_opt(arg, "refs/remotes/");
 795                                 continue;
 796                         }
 797                         if (skip_prefix(arg, "--exclude=", &arg)) {
 798                                 add_ref_exclusion(&ref_excludes, arg);
 799                                 continue;
 800                         }
 801                         if (!strcmp(arg, "--show-toplevel")) {
 802                                 const char *work_tree = get_git_work_tree();
 803                                 if (work_tree)
 804                                         puts(work_tree);
 805                                 continue;
 806                         }
 807                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 808                                 const char *superproject = get_superproject_working_tree();
 809                                 if (superproject)
 810                                         puts(superproject);
 811                                 continue;
 812                         }
 813                         if (!strcmp(arg, "--show-prefix")) {
 814                                 if (prefix)
 815                                         puts(prefix);
 816                                 else
 817                                         putchar('\n');
 818                                 continue;
 819                         }
 820                         if (!strcmp(arg, "--show-cdup")) {
 821                                 const char *pfx = prefix;
 822                                 if (!is_inside_work_tree()) {
 823                                         const char *work_tree =
 824                                                 get_git_work_tree();
 825                                         if (work_tree)
 826                                                 printf("%s\n", work_tree);
 827                                         continue;
 828                                 }
 829                                 while (pfx) {
 830                                         pfx = strchr(pfx, '/');
 831                                         if (pfx) {
 832                                                 pfx++;
 833                                                 printf("../");
 834                                         }
 835                                 }
 836                                 putchar('\n');
 837                                 continue;
 838                         }
 839                         if (!strcmp(arg, "--git-dir") ||
 840                             !strcmp(arg, "--absolute-git-dir")) {
 841                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 842                                 char *cwd;
 843                                 int len;
 844                                 if (arg[2] == 'g') {    /* --git-dir */
 845                                         if (gitdir) {
 846                                                 puts(gitdir);
 847                                                 continue;
 848                                         }
 849                                         if (!prefix) {
 850                                                 puts(".git");
 851                                                 continue;
 852                                         }
 853                                 } else {                /* --absolute-git-dir */
 854                                         if (!gitdir && !prefix)
 855                                                 gitdir = ".git";
 856                                         if (gitdir) {
 857                                                 puts(real_path(gitdir));
 858                                                 continue;
 859                                         }
 860                                 }
 861                                 cwd = xgetcwd();
 862                                 len = strlen(cwd);
 863                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 864                                 free(cwd);
 865                                 continue;
 866                         }
 867                         if (!strcmp(arg, "--git-common-dir")) {
 868                                 strbuf_reset(&buf);
 869                                 puts(relative_path(get_git_common_dir(),
 870                                                    prefix, &buf));
 871                                 continue;
 872                         }
 873                         if (!strcmp(arg, "--is-inside-git-dir")) {
 874                                 printf("%s\n", is_inside_git_dir() ? "true"
 875                                                 : "false");
 876                                 continue;
 877                         }
 878                         if (!strcmp(arg, "--is-inside-work-tree")) {
 879                                 printf("%s\n", is_inside_work_tree() ? "true"
 880                                                 : "false");
 881                                 continue;
 882                         }
 883                         if (!strcmp(arg, "--is-bare-repository")) {
 884                                 printf("%s\n", is_bare_repository() ? "true"
 885                                                 : "false");
 886                                 continue;
 887                         }
 888                         if (!strcmp(arg, "--is-shallow-repository")) {
 889                                 printf("%s\n",
 890                                                 is_repository_shallow(the_repository) ? "true"
 891                                                 : "false");
 892                                 continue;
 893                         }
 894                         if (!strcmp(arg, "--shared-index-path")) {
 895                                 if (read_cache() < 0)
 896                                         die(_("Could not read the index"));
 897                                 if (the_index.split_index) {
 898                                         const struct object_id *oid = &the_index.split_index->base_oid;
 899                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
 900                                         strbuf_reset(&buf);
 901                                         puts(relative_path(path, prefix, &buf));
 902                                 }
 903                                 continue;
 904                         }
 905                         if (skip_prefix(arg, "--since=", &arg)) {
 906                                 show_datestring("--max-age=", arg);
 907                                 continue;
 908                         }
 909                         if (skip_prefix(arg, "--after=", &arg)) {
 910                                 show_datestring("--max-age=", arg);
 911                                 continue;
 912                         }
 913                         if (skip_prefix(arg, "--before=", &arg)) {
 914                                 show_datestring("--min-age=", arg);
 915                                 continue;
 916                         }
 917                         if (skip_prefix(arg, "--until=", &arg)) {
 918                                 show_datestring("--min-age=", arg);
 919                                 continue;
 920                         }
 921                         if (show_flag(arg) && verify)
 922                                 die_no_single_rev(quiet);
 923                         continue;
 924                 }
 925
 926                 /* Not a flag argument */
 927                 if (try_difference(arg))
 928                         continue;
 929                 if (try_parent_shorthands(arg))
 930                         continue;
 931                 name = arg;
 932                 type = NORMAL;
 933                 if (*arg == '^') {
 934                         name++;
 935                         type = REVERSED;
 936                 }
 937                 if (!get_oid_with_context(the_repository, name,
 938                                           flags, &oid, &unused)) {
 939                         if (verify)
 940                                 revs_count++;
 941                         else
 942                                 show_rev(type, &oid, name);
 943                         continue;
 944                 }
 945                 if (verify)
 946                         die_no_single_rev(quiet);
 947                 if (has_dashdash)
 948                         die("bad revision '%s'", arg);
 949                 as_is = 1;
 950                 if (!show_file(arg, output_prefix))
 951                         continue;
 952                 verify_filename(prefix, arg, 1);
 953         }
 954         strbuf_release(&buf);
 955         if (verify) {
 956                 if (revs_count == 1) {
 957                         show_rev(type, &oid, name);
 958                         return 0;
 959                 } else if (revs_count == 0 && show_default())
 960                         return 0;
 961                 die_no_single_rev(quiet);
 962         } else
 963                 show_default();
 964         return 0;
 965 }