Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit send-email: simplify Gmail example in the documentation (4855f06)
   1/*
   2 * rev-parse.c
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "commit.h"
   8#include "refs.h"
   9#include "quote.h"
  10#include "builtin.h"
  11#include "parse-options.h"
  12#include "diff.h"
  13#include "revision.h"
  14#include "split-index.h"
  15
  16#define DO_REVS         1
  17#define DO_NOREV        2
  18#define DO_FLAGS        4
  19#define DO_NONFLAGS     8
  20static int filter = ~0;
  21
  22static const char *def;
  23
  24#define NORMAL 0
  25#define REVERSED 1
  26static int show_type = NORMAL;
  27
  28#define SHOW_SYMBOLIC_ASIS 1
  29#define SHOW_SYMBOLIC_FULL 2
  30static int symbolic;
  31static int abbrev;
  32static int abbrev_ref;
  33static int abbrev_ref_strict;
  34static int output_sq;
  35
  36static int stuck_long;
  37static struct string_list *ref_excludes;
  38
  39/*
  40 * Some arguments are relevant "revision" arguments,
  41 * others are about output format or other details.
  42 * This sorts it all out.
  43 */
  44static int is_rev_argument(const char *arg)
  45{
  46        static const char *rev_args[] = {
  47                "--all",
  48                "--bisect",
  49                "--dense",
  50                "--branches=",
  51                "--branches",
  52                "--header",
  53                "--ignore-missing",
  54                "--max-age=",
  55                "--max-count=",
  56                "--min-age=",
  57                "--no-merges",
  58                "--min-parents=",
  59                "--no-min-parents",
  60                "--max-parents=",
  61                "--no-max-parents",
  62                "--objects",
  63                "--objects-edge",
  64                "--parents",
  65                "--pretty",
  66                "--remotes=",
  67                "--remotes",
  68                "--glob=",
  69                "--sparse",
  70                "--tags=",
  71                "--tags",
  72                "--topo-order",
  73                "--date-order",
  74                "--unpacked",
  75                NULL
  76        };
  77        const char **p = rev_args;
  78
  79        /* accept -<digit>, like traditional "head" */
  80        if ((*arg == '-') && isdigit(arg[1]))
  81                return 1;
  82
  83        for (;;) {
  84                const char *str = *p++;
  85                int len;
  86                if (!str)
  87                        return 0;
  88                len = strlen(str);
  89                if (!strcmp(arg, str) ||
  90                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  91                        return 1;
  92        }
  93}
  94
  95/* Output argument as a string, either SQ or normal */
  96static void show(const char *arg)
  97{
  98        if (output_sq) {
  99                int sq = '\'', ch;
 100
 101                putchar(sq);
 102                while ((ch = *arg++)) {
 103                        if (ch == sq)
 104                                fputs("'\\'", stdout);
 105                        putchar(ch);
 106                }
 107                putchar(sq);
 108                putchar(' ');
 109        }
 110        else
 111                puts(arg);
 112}
 113
 114/* Like show(), but with a negation prefix according to type */
 115static void show_with_type(int type, const char *arg)
 116{
 117        if (type != show_type)
 118                putchar('^');
 119        show(arg);
 120}
 121
 122/* Output a revision, only if filter allows it */
 123static void show_rev(int type, const unsigned char *sha1, const char *name)
 124{
 125        if (!(filter & DO_REVS))
 126                return;
 127        def = NULL;
 128
 129        if ((symbolic || abbrev_ref) && name) {
 130                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 131                        unsigned char discard[20];
 132                        char *full;
 133
 134                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 135                        case 0:
 136                                /*
 137                                 * Not found -- not a ref.  We could
 138                                 * emit "name" here, but symbolic-full
 139                                 * users are interested in finding the
 140                                 * refs spelled in full, and they would
 141                                 * need to filter non-refs if we did so.
 142                                 */
 143                                break;
 144                        case 1: /* happy */
 145                                if (abbrev_ref)
 146                                        full = shorten_unambiguous_ref(full,
 147                                                abbrev_ref_strict);
 148                                show_with_type(type, full);
 149                                break;
 150                        default: /* ambiguous */
 151                                error("refname '%s' is ambiguous", name);
 152                                break;
 153                        }
 154                        free(full);
 155                } else {
 156                        show_with_type(type, name);
 157                }
 158        }
 159        else if (abbrev)
 160                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 161        else
 162                show_with_type(type, sha1_to_hex(sha1));
 163}
 164
 165/* Output a flag, only if filter allows it. */
 166static int show_flag(const char *arg)
 167{
 168        if (!(filter & DO_FLAGS))
 169                return 0;
 170        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 171                show(arg);
 172                return 1;
 173        }
 174        return 0;
 175}
 176
 177static int show_default(void)
 178{
 179        const char *s = def;
 180
 181        if (s) {
 182                unsigned char sha1[20];
 183
 184                def = NULL;
 185                if (!get_sha1(s, sha1)) {
 186                        show_rev(NORMAL, sha1, s);
 187                        return 1;
 188                }
 189        }
 190        return 0;
 191}
 192
 193static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 194{
 195        if (ref_excluded(ref_excludes, refname))
 196                return 0;
 197        show_rev(NORMAL, oid->hash, refname);
 198        return 0;
 199}
 200
 201static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 202{
 203        show_rev(REVERSED, oid->hash, refname);
 204        return 0;
 205}
 206
 207static int show_abbrev(const unsigned char *sha1, void *cb_data)
 208{
 209        show_rev(NORMAL, sha1, NULL);
 210        return 0;
 211}
 212
 213static void show_datestring(const char *flag, const char *datestr)
 214{
 215        static char buffer[100];
 216
 217        /* date handling requires both flags and revs */
 218        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 219                return;
 220        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 221        show(buffer);
 222}
 223
 224static int show_file(const char *arg, int output_prefix)
 225{
 226        show_default();
 227        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 228                if (output_prefix) {
 229                        const char *prefix = startup_info->prefix;
 230                        show(prefix_filename(prefix,
 231                                             prefix ? strlen(prefix) : 0,
 232                                             arg));
 233                } else
 234                        show(arg);
 235                return 1;
 236        }
 237        return 0;
 238}
 239
 240static int try_difference(const char *arg)
 241{
 242        char *dotdot;
 243        unsigned char sha1[20];
 244        unsigned char end[20];
 245        const char *next;
 246        const char *this;
 247        int symmetric;
 248        static const char head_by_default[] = "HEAD";
 249
 250        if (!(dotdot = strstr(arg, "..")))
 251                return 0;
 252        next = dotdot + 2;
 253        this = arg;
 254        symmetric = (*next == '.');
 255
 256        *dotdot = 0;
 257        next += symmetric;
 258
 259        if (!*next)
 260                next = head_by_default;
 261        if (dotdot == arg)
 262                this = head_by_default;
 263
 264        if (this == head_by_default && next == head_by_default &&
 265            !symmetric) {
 266                /*
 267                 * Just ".."?  That is not a range but the
 268                 * pathspec for the parent directory.
 269                 */
 270                *dotdot = '.';
 271                return 0;
 272        }
 273
 274        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 275                show_rev(NORMAL, end, next);
 276                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 277                if (symmetric) {
 278                        struct commit_list *exclude;
 279                        struct commit *a, *b;
 280                        a = lookup_commit_reference(sha1);
 281                        b = lookup_commit_reference(end);
 282                        exclude = get_merge_bases(a, b);
 283                        while (exclude) {
 284                                struct commit *commit = pop_commit(&exclude);
 285                                show_rev(REVERSED, commit->object.oid.hash, NULL);
 286                        }
 287                }
 288                *dotdot = '.';
 289                return 1;
 290        }
 291        *dotdot = '.';
 292        return 0;
 293}
 294
 295static int try_parent_shorthands(const char *arg)
 296{
 297        char *dotdot;
 298        unsigned char sha1[20];
 299        struct commit *commit;
 300        struct commit_list *parents;
 301        int parents_only;
 302
 303        if ((dotdot = strstr(arg, "^!")))
 304                parents_only = 0;
 305        else if ((dotdot = strstr(arg, "^@")))
 306                parents_only = 1;
 307
 308        if (!dotdot || dotdot[2])
 309                return 0;
 310
 311        *dotdot = 0;
 312        if (get_sha1_committish(arg, sha1)) {
 313                *dotdot = '^';
 314                return 0;
 315        }
 316
 317        if (!parents_only)
 318                show_rev(NORMAL, sha1, arg);
 319        commit = lookup_commit_reference(sha1);
 320        for (parents = commit->parents; parents; parents = parents->next)
 321                show_rev(parents_only ? NORMAL : REVERSED,
 322                                parents->item->object.oid.hash, arg);
 323
 324        *dotdot = '^';
 325        return 1;
 326}
 327
 328static int parseopt_dump(const struct option *o, const char *arg, int unset)
 329{
 330        struct strbuf *parsed = o->value;
 331        if (unset)
 332                strbuf_addf(parsed, " --no-%s", o->long_name);
 333        else if (o->short_name && (o->long_name == NULL || !stuck_long))
 334                strbuf_addf(parsed, " -%c", o->short_name);
 335        else
 336                strbuf_addf(parsed, " --%s", o->long_name);
 337        if (arg) {
 338                if (!stuck_long)
 339                        strbuf_addch(parsed, ' ');
 340                else if (o->long_name)
 341                        strbuf_addch(parsed, '=');
 342                sq_quote_buf(parsed, arg);
 343        }
 344        return 0;
 345}
 346
 347static const char *skipspaces(const char *s)
 348{
 349        while (isspace(*s))
 350                s++;
 351        return s;
 352}
 353
 354static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 355{
 356        static int keep_dashdash = 0, stop_at_non_option = 0;
 357        static char const * const parseopt_usage[] = {
 358                N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 359                NULL
 360        };
 361        static struct option parseopt_opts[] = {
 362                OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 363                                        N_("keep the `--` passed as an arg")),
 364                OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 365                                        N_("stop parsing after the "
 366                                           "first non-option argument")),
 367                OPT_BOOL(0, "stuck-long", &stuck_long,
 368                                        N_("output in stuck long form")),
 369                OPT_END(),
 370        };
 371        static const char * const flag_chars = "*=?!";
 372
 373        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 374        const char **usage = NULL;
 375        struct option *opts = NULL;
 376        int onb = 0, osz = 0, unb = 0, usz = 0;
 377
 378        strbuf_addstr(&parsed, "set --");
 379        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 380                             PARSE_OPT_KEEP_DASHDASH);
 381        if (argc < 1 || strcmp(argv[0], "--"))
 382                usage_with_options(parseopt_usage, parseopt_opts);
 383
 384        /* get the usage up to the first line with a -- on it */
 385        for (;;) {
 386                if (strbuf_getline(&sb, stdin) == EOF)
 387                        die("premature end of input");
 388                ALLOC_GROW(usage, unb + 1, usz);
 389                if (!strcmp("--", sb.buf)) {
 390                        if (unb < 1)
 391                                die("no usage string given before the `--' separator");
 392                        usage[unb] = NULL;
 393                        break;
 394                }
 395                usage[unb++] = strbuf_detach(&sb, NULL);
 396        }
 397
 398        /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 399        while (strbuf_getline(&sb, stdin) != EOF) {
 400                const char *s;
 401                const char *help;
 402                struct option *o;
 403
 404                if (!sb.len)
 405                        continue;
 406
 407                ALLOC_GROW(opts, onb + 1, osz);
 408                memset(opts + onb, 0, sizeof(opts[onb]));
 409
 410                o = &opts[onb++];
 411                help = strchr(sb.buf, ' ');
 412                if (!help || *sb.buf == ' ') {
 413                        o->type = OPTION_GROUP;
 414                        o->help = xstrdup(skipspaces(sb.buf));
 415                        continue;
 416                }
 417
 418                o->type = OPTION_CALLBACK;
 419                o->help = xstrdup(skipspaces(help));
 420                o->value = &parsed;
 421                o->flags = PARSE_OPT_NOARG;
 422                o->callback = &parseopt_dump;
 423
 424                /* name(s) */
 425                s = strpbrk(sb.buf, flag_chars);
 426                if (s == NULL)
 427                        s = help;
 428
 429                if (s - sb.buf == 1) /* short option only */
 430                        o->short_name = *sb.buf;
 431                else if (sb.buf[1] != ',') /* long option only */
 432                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 433                else {
 434                        o->short_name = *sb.buf;
 435                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 436                }
 437
 438                /* flags */
 439                while (s < help) {
 440                        switch (*s++) {
 441                        case '=':
 442                                o->flags &= ~PARSE_OPT_NOARG;
 443                                continue;
 444                        case '?':
 445                                o->flags &= ~PARSE_OPT_NOARG;
 446                                o->flags |= PARSE_OPT_OPTARG;
 447                                continue;
 448                        case '!':
 449                                o->flags |= PARSE_OPT_NONEG;
 450                                continue;
 451                        case '*':
 452                                o->flags |= PARSE_OPT_HIDDEN;
 453                                continue;
 454                        }
 455                        s--;
 456                        break;
 457                }
 458
 459                if (s < help)
 460                        o->argh = xmemdupz(s, help - s);
 461        }
 462        strbuf_release(&sb);
 463
 464        /* put an OPT_END() */
 465        ALLOC_GROW(opts, onb + 1, osz);
 466        memset(opts + onb, 0, sizeof(opts[onb]));
 467        argc = parse_options(argc, argv, prefix, opts, usage,
 468                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 469                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 470                        PARSE_OPT_SHELL_EVAL);
 471
 472        strbuf_addf(&parsed, " --");
 473        sq_quote_argv(&parsed, argv, 0);
 474        puts(parsed.buf);
 475        return 0;
 476}
 477
 478static int cmd_sq_quote(int argc, const char **argv)
 479{
 480        struct strbuf buf = STRBUF_INIT;
 481
 482        if (argc)
 483                sq_quote_argv(&buf, argv, 0);
 484        printf("%s\n", buf.buf);
 485        strbuf_release(&buf);
 486
 487        return 0;
 488}
 489
 490static void die_no_single_rev(int quiet)
 491{
 492        if (quiet)
 493                exit(1);
 494        else
 495                die("Needed a single revision");
 496}
 497
 498static const char builtin_rev_parse_usage[] =
 499N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 500   "   or: git rev-parse --sq-quote [<arg>...]\n"
 501   "   or: git rev-parse [<options>] [<arg>...]\n"
 502   "\n"
 503   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 504
 505int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 506{
 507        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 508        int did_repo_setup = 0;
 509        int has_dashdash = 0;
 510        int output_prefix = 0;
 511        unsigned char sha1[20];
 512        unsigned int flags = 0;
 513        const char *name = NULL;
 514        struct object_context unused;
 515
 516        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 517                return cmd_parseopt(argc - 1, argv + 1, prefix);
 518
 519        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 520                return cmd_sq_quote(argc - 2, argv + 2);
 521
 522        if (argc > 1 && !strcmp("-h", argv[1]))
 523                usage(builtin_rev_parse_usage);
 524
 525        for (i = 1; i < argc; i++) {
 526                if (!strcmp(argv[i], "--")) {
 527                        has_dashdash = 1;
 528                        break;
 529                }
 530        }
 531
 532        /* No options; just report on whether we're in a git repo or not. */
 533        if (argc == 1) {
 534                setup_git_directory();
 535                git_config(git_default_config, NULL);
 536                return 0;
 537        }
 538
 539        for (i = 1; i < argc; i++) {
 540                const char *arg = argv[i];
 541
 542                if (!strcmp(arg, "--local-env-vars")) {
 543                        int i;
 544                        for (i = 0; local_repo_env[i]; i++)
 545                                printf("%s\n", local_repo_env[i]);
 546                        continue;
 547                }
 548                if (!strcmp(arg, "--resolve-git-dir")) {
 549                        const char *gitdir = argv[++i];
 550                        if (!gitdir)
 551                                die("--resolve-git-dir requires an argument");
 552                        gitdir = resolve_gitdir(gitdir);
 553                        if (!gitdir)
 554                                die("not a gitdir '%s'", argv[i]);
 555                        puts(gitdir);
 556                        continue;
 557                }
 558
 559                /* The rest of the options require a git repository. */
 560                if (!did_repo_setup) {
 561                        prefix = setup_git_directory();
 562                        git_config(git_default_config, NULL);
 563                        did_repo_setup = 1;
 564                }
 565
 566                if (!strcmp(arg, "--git-path")) {
 567                        if (!argv[i + 1])
 568                                die("--git-path requires an argument");
 569                        puts(git_path("%s", argv[i + 1]));
 570                        i++;
 571                        continue;
 572                }
 573                if (as_is) {
 574                        if (show_file(arg, output_prefix) && as_is < 2)
 575                                verify_filename(prefix, arg, 0);
 576                        continue;
 577                }
 578                if (!strcmp(arg,"-n")) {
 579                        if (++i >= argc)
 580                                die("-n requires an argument");
 581                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 582                                show(arg);
 583                                show(argv[i]);
 584                        }
 585                        continue;
 586                }
 587                if (starts_with(arg, "-n")) {
 588                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 589                                show(arg);
 590                        continue;
 591                }
 592
 593                if (*arg == '-') {
 594                        if (!strcmp(arg, "--")) {
 595                                as_is = 2;
 596                                /* Pass on the "--" if we show anything but files.. */
 597                                if (filter & (DO_FLAGS | DO_REVS))
 598                                        show_file(arg, 0);
 599                                continue;
 600                        }
 601                        if (!strcmp(arg, "--default")) {
 602                                def = argv[++i];
 603                                if (!def)
 604                                        die("--default requires an argument");
 605                                continue;
 606                        }
 607                        if (!strcmp(arg, "--prefix")) {
 608                                prefix = argv[++i];
 609                                if (!prefix)
 610                                        die("--prefix requires an argument");
 611                                startup_info->prefix = prefix;
 612                                output_prefix = 1;
 613                                continue;
 614                        }
 615                        if (!strcmp(arg, "--revs-only")) {
 616                                filter &= ~DO_NOREV;
 617                                continue;
 618                        }
 619                        if (!strcmp(arg, "--no-revs")) {
 620                                filter &= ~DO_REVS;
 621                                continue;
 622                        }
 623                        if (!strcmp(arg, "--flags")) {
 624                                filter &= ~DO_NONFLAGS;
 625                                continue;
 626                        }
 627                        if (!strcmp(arg, "--no-flags")) {
 628                                filter &= ~DO_FLAGS;
 629                                continue;
 630                        }
 631                        if (!strcmp(arg, "--verify")) {
 632                                filter &= ~(DO_FLAGS|DO_NOREV);
 633                                verify = 1;
 634                                continue;
 635                        }
 636                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 637                                quiet = 1;
 638                                flags |= GET_SHA1_QUIETLY;
 639                                continue;
 640                        }
 641                        if (!strcmp(arg, "--short") ||
 642                            starts_with(arg, "--short=")) {
 643                                filter &= ~(DO_FLAGS|DO_NOREV);
 644                                verify = 1;
 645                                abbrev = DEFAULT_ABBREV;
 646                                if (arg[7] == '=')
 647                                        abbrev = strtoul(arg + 8, NULL, 10);
 648                                if (abbrev < MINIMUM_ABBREV)
 649                                        abbrev = MINIMUM_ABBREV;
 650                                else if (40 <= abbrev)
 651                                        abbrev = 40;
 652                                continue;
 653                        }
 654                        if (!strcmp(arg, "--sq")) {
 655                                output_sq = 1;
 656                                continue;
 657                        }
 658                        if (!strcmp(arg, "--not")) {
 659                                show_type ^= REVERSED;
 660                                continue;
 661                        }
 662                        if (!strcmp(arg, "--symbolic")) {
 663                                symbolic = SHOW_SYMBOLIC_ASIS;
 664                                continue;
 665                        }
 666                        if (!strcmp(arg, "--symbolic-full-name")) {
 667                                symbolic = SHOW_SYMBOLIC_FULL;
 668                                continue;
 669                        }
 670                        if (starts_with(arg, "--abbrev-ref") &&
 671                            (!arg[12] || arg[12] == '=')) {
 672                                abbrev_ref = 1;
 673                                abbrev_ref_strict = warn_ambiguous_refs;
 674                                if (arg[12] == '=') {
 675                                        if (!strcmp(arg + 13, "strict"))
 676                                                abbrev_ref_strict = 1;
 677                                        else if (!strcmp(arg + 13, "loose"))
 678                                                abbrev_ref_strict = 0;
 679                                        else
 680                                                die("unknown mode for %s", arg);
 681                                }
 682                                continue;
 683                        }
 684                        if (!strcmp(arg, "--all")) {
 685                                for_each_ref(show_reference, NULL);
 686                                continue;
 687                        }
 688                        if (starts_with(arg, "--disambiguate=")) {
 689                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 690                                continue;
 691                        }
 692                        if (!strcmp(arg, "--bisect")) {
 693                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 694                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 695                                continue;
 696                        }
 697                        if (starts_with(arg, "--branches=")) {
 698                                for_each_glob_ref_in(show_reference, arg + 11,
 699                                        "refs/heads/", NULL);
 700                                clear_ref_exclusion(&ref_excludes);
 701                                continue;
 702                        }
 703                        if (!strcmp(arg, "--branches")) {
 704                                for_each_branch_ref(show_reference, NULL);
 705                                clear_ref_exclusion(&ref_excludes);
 706                                continue;
 707                        }
 708                        if (starts_with(arg, "--tags=")) {
 709                                for_each_glob_ref_in(show_reference, arg + 7,
 710                                        "refs/tags/", NULL);
 711                                clear_ref_exclusion(&ref_excludes);
 712                                continue;
 713                        }
 714                        if (!strcmp(arg, "--tags")) {
 715                                for_each_tag_ref(show_reference, NULL);
 716                                clear_ref_exclusion(&ref_excludes);
 717                                continue;
 718                        }
 719                        if (starts_with(arg, "--glob=")) {
 720                                for_each_glob_ref(show_reference, arg + 7, NULL);
 721                                clear_ref_exclusion(&ref_excludes);
 722                                continue;
 723                        }
 724                        if (starts_with(arg, "--remotes=")) {
 725                                for_each_glob_ref_in(show_reference, arg + 10,
 726                                        "refs/remotes/", NULL);
 727                                clear_ref_exclusion(&ref_excludes);
 728                                continue;
 729                        }
 730                        if (!strcmp(arg, "--remotes")) {
 731                                for_each_remote_ref(show_reference, NULL);
 732                                clear_ref_exclusion(&ref_excludes);
 733                                continue;
 734                        }
 735                        if (starts_with(arg, "--exclude=")) {
 736                                add_ref_exclusion(&ref_excludes, arg + 10);
 737                                continue;
 738                        }
 739                        if (!strcmp(arg, "--show-toplevel")) {
 740                                const char *work_tree = get_git_work_tree();
 741                                if (work_tree)
 742                                        puts(work_tree);
 743                                continue;
 744                        }
 745                        if (!strcmp(arg, "--show-prefix")) {
 746                                if (prefix)
 747                                        puts(prefix);
 748                                else
 749                                        putchar('\n');
 750                                continue;
 751                        }
 752                        if (!strcmp(arg, "--show-cdup")) {
 753                                const char *pfx = prefix;
 754                                if (!is_inside_work_tree()) {
 755                                        const char *work_tree =
 756                                                get_git_work_tree();
 757                                        if (work_tree)
 758                                                printf("%s\n", work_tree);
 759                                        continue;
 760                                }
 761                                while (pfx) {
 762                                        pfx = strchr(pfx, '/');
 763                                        if (pfx) {
 764                                                pfx++;
 765                                                printf("../");
 766                                        }
 767                                }
 768                                putchar('\n');
 769                                continue;
 770                        }
 771                        if (!strcmp(arg, "--git-dir")) {
 772                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 773                                char *cwd;
 774                                int len;
 775                                if (gitdir) {
 776                                        puts(gitdir);
 777                                        continue;
 778                                }
 779                                if (!prefix) {
 780                                        puts(".git");
 781                                        continue;
 782                                }
 783                                cwd = xgetcwd();
 784                                len = strlen(cwd);
 785                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 786                                free(cwd);
 787                                continue;
 788                        }
 789                        if (!strcmp(arg, "--git-common-dir")) {
 790                                const char *pfx = prefix ? prefix : "";
 791                                puts(prefix_filename(pfx, strlen(pfx), get_git_common_dir()));
 792                                continue;
 793                        }
 794                        if (!strcmp(arg, "--is-inside-git-dir")) {
 795                                printf("%s\n", is_inside_git_dir() ? "true"
 796                                                : "false");
 797                                continue;
 798                        }
 799                        if (!strcmp(arg, "--is-inside-work-tree")) {
 800                                printf("%s\n", is_inside_work_tree() ? "true"
 801                                                : "false");
 802                                continue;
 803                        }
 804                        if (!strcmp(arg, "--is-bare-repository")) {
 805                                printf("%s\n", is_bare_repository() ? "true"
 806                                                : "false");
 807                                continue;
 808                        }
 809                        if (!strcmp(arg, "--shared-index-path")) {
 810                                if (read_cache() < 0)
 811                                        die(_("Could not read the index"));
 812                                if (the_index.split_index) {
 813                                        const unsigned char *sha1 = the_index.split_index->base_sha1;
 814                                        puts(git_path("sharedindex.%s", sha1_to_hex(sha1)));
 815                                }
 816                                continue;
 817                        }
 818                        if (starts_with(arg, "--since=")) {
 819                                show_datestring("--max-age=", arg+8);
 820                                continue;
 821                        }
 822                        if (starts_with(arg, "--after=")) {
 823                                show_datestring("--max-age=", arg+8);
 824                                continue;
 825                        }
 826                        if (starts_with(arg, "--before=")) {
 827                                show_datestring("--min-age=", arg+9);
 828                                continue;
 829                        }
 830                        if (starts_with(arg, "--until=")) {
 831                                show_datestring("--min-age=", arg+8);
 832                                continue;
 833                        }
 834                        if (show_flag(arg) && verify)
 835                                die_no_single_rev(quiet);
 836                        continue;
 837                }
 838
 839                /* Not a flag argument */
 840                if (try_difference(arg))
 841                        continue;
 842                if (try_parent_shorthands(arg))
 843                        continue;
 844                name = arg;
 845                type = NORMAL;
 846                if (*arg == '^') {
 847                        name++;
 848                        type = REVERSED;
 849                }
 850                if (!get_sha1_with_context(name, flags, sha1, &unused)) {
 851                        if (verify)
 852                                revs_count++;
 853                        else
 854                                show_rev(type, sha1, name);
 855                        continue;
 856                }
 857                if (verify)
 858                        die_no_single_rev(quiet);
 859                if (has_dashdash)
 860                        die("bad revision '%s'", arg);
 861                as_is = 1;
 862                if (!show_file(arg, output_prefix))
 863                        continue;
 864                verify_filename(prefix, arg, 1);
 865        }
 866        if (verify) {
 867                if (revs_count == 1) {
 868                        show_rev(type, sha1, name);
 869                        return 0;
 870                } else if (revs_count == 0 && show_default())
 871                        return 0;
 872                die_no_single_rev(quiet);
 873        } else
 874                show_default();
 875        return 0;
 876}