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