Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit Merge branch 'as/tree-walk-fix-aggressive-short-cut' into maint (b4e931d)
   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
  13#define DO_REVS         1
  14#define DO_NOREV        2
  15#define DO_FLAGS        4
  16#define DO_NONFLAGS     8
  17static int filter = ~0;
  18
  19static const char *def;
  20
  21#define NORMAL 0
  22#define REVERSED 1
  23static int show_type = NORMAL;
  24
  25#define SHOW_SYMBOLIC_ASIS 1
  26#define SHOW_SYMBOLIC_FULL 2
  27static int symbolic;
  28static int abbrev;
  29static int abbrev_ref;
  30static int abbrev_ref_strict;
  31static int output_sq;
  32
  33/*
  34 * Some arguments are relevant "revision" arguments,
  35 * others are about output format or other details.
  36 * This sorts it all out.
  37 */
  38static int is_rev_argument(const char *arg)
  39{
  40        static const char *rev_args[] = {
  41                "--all",
  42                "--bisect",
  43                "--dense",
  44                "--branches=",
  45                "--branches",
  46                "--header",
  47                "--ignore-missing",
  48                "--max-age=",
  49                "--max-count=",
  50                "--min-age=",
  51                "--no-merges",
  52                "--min-parents=",
  53                "--no-min-parents",
  54                "--max-parents=",
  55                "--no-max-parents",
  56                "--objects",
  57                "--objects-edge",
  58                "--parents",
  59                "--pretty",
  60                "--remotes=",
  61                "--remotes",
  62                "--glob=",
  63                "--sparse",
  64                "--tags=",
  65                "--tags",
  66                "--topo-order",
  67                "--date-order",
  68                "--unpacked",
  69                NULL
  70        };
  71        const char **p = rev_args;
  72
  73        /* accept -<digit>, like traditional "head" */
  74        if ((*arg == '-') && isdigit(arg[1]))
  75                return 1;
  76
  77        for (;;) {
  78                const char *str = *p++;
  79                int len;
  80                if (!str)
  81                        return 0;
  82                len = strlen(str);
  83                if (!strcmp(arg, str) ||
  84                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  85                        return 1;
  86        }
  87}
  88
  89/* Output argument as a string, either SQ or normal */
  90static void show(const char *arg)
  91{
  92        if (output_sq) {
  93                int sq = '\'', ch;
  94
  95                putchar(sq);
  96                while ((ch = *arg++)) {
  97                        if (ch == sq)
  98                                fputs("'\\'", stdout);
  99                        putchar(ch);
 100                }
 101                putchar(sq);
 102                putchar(' ');
 103        }
 104        else
 105                puts(arg);
 106}
 107
 108/* Like show(), but with a negation prefix according to type */
 109static void show_with_type(int type, const char *arg)
 110{
 111        if (type != show_type)
 112                putchar('^');
 113        show(arg);
 114}
 115
 116/* Output a revision, only if filter allows it */
 117static void show_rev(int type, const unsigned char *sha1, const char *name)
 118{
 119        if (!(filter & DO_REVS))
 120                return;
 121        def = NULL;
 122
 123        if ((symbolic || abbrev_ref) && name) {
 124                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 125                        unsigned char discard[20];
 126                        char *full;
 127
 128                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 129                        case 0:
 130                                /*
 131                                 * Not found -- not a ref.  We could
 132                                 * emit "name" here, but symbolic-full
 133                                 * users are interested in finding the
 134                                 * refs spelled in full, and they would
 135                                 * need to filter non-refs if we did so.
 136                                 */
 137                                break;
 138                        case 1: /* happy */
 139                                if (abbrev_ref)
 140                                        full = shorten_unambiguous_ref(full,
 141                                                abbrev_ref_strict);
 142                                show_with_type(type, full);
 143                                break;
 144                        default: /* ambiguous */
 145                                error("refname '%s' is ambiguous", name);
 146                                break;
 147                        }
 148                } else {
 149                        show_with_type(type, name);
 150                }
 151        }
 152        else if (abbrev)
 153                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 154        else
 155                show_with_type(type, sha1_to_hex(sha1));
 156}
 157
 158/* Output a flag, only if filter allows it. */
 159static int show_flag(const char *arg)
 160{
 161        if (!(filter & DO_FLAGS))
 162                return 0;
 163        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 164                show(arg);
 165                return 1;
 166        }
 167        return 0;
 168}
 169
 170static int show_default(void)
 171{
 172        const char *s = def;
 173
 174        if (s) {
 175                unsigned char sha1[20];
 176
 177                def = NULL;
 178                if (!get_sha1(s, sha1)) {
 179                        show_rev(NORMAL, sha1, s);
 180                        return 1;
 181                }
 182        }
 183        return 0;
 184}
 185
 186static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 187{
 188        show_rev(NORMAL, sha1, refname);
 189        return 0;
 190}
 191
 192static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 193{
 194        show_rev(REVERSED, sha1, refname);
 195        return 0;
 196}
 197
 198static int show_abbrev(const unsigned char *sha1, void *cb_data)
 199{
 200        show_rev(NORMAL, sha1, NULL);
 201        return 0;
 202}
 203
 204static void show_datestring(const char *flag, const char *datestr)
 205{
 206        static char buffer[100];
 207
 208        /* date handling requires both flags and revs */
 209        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 210                return;
 211        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 212        show(buffer);
 213}
 214
 215static int show_file(const char *arg, int output_prefix)
 216{
 217        show_default();
 218        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 219                if (output_prefix) {
 220                        const char *prefix = startup_info->prefix;
 221                        show(prefix_filename(prefix,
 222                                             prefix ? strlen(prefix) : 0,
 223                                             arg));
 224                } else
 225                        show(arg);
 226                return 1;
 227        }
 228        return 0;
 229}
 230
 231static int try_difference(const char *arg)
 232{
 233        char *dotdot;
 234        unsigned char sha1[20];
 235        unsigned char end[20];
 236        const char *next;
 237        const char *this;
 238        int symmetric;
 239        static const char head_by_default[] = "HEAD";
 240
 241        if (!(dotdot = strstr(arg, "..")))
 242                return 0;
 243        next = dotdot + 2;
 244        this = arg;
 245        symmetric = (*next == '.');
 246
 247        *dotdot = 0;
 248        next += symmetric;
 249
 250        if (!*next)
 251                next = head_by_default;
 252        if (dotdot == arg)
 253                this = head_by_default;
 254
 255        if (this == head_by_default && next == head_by_default &&
 256            !symmetric) {
 257                /*
 258                 * Just ".."?  That is not a range but the
 259                 * pathspec for the parent directory.
 260                 */
 261                *dotdot = '.';
 262                return 0;
 263        }
 264
 265        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 266                show_rev(NORMAL, end, next);
 267                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 268                if (symmetric) {
 269                        struct commit_list *exclude;
 270                        struct commit *a, *b;
 271                        a = lookup_commit_reference(sha1);
 272                        b = lookup_commit_reference(end);
 273                        exclude = get_merge_bases(a, b, 1);
 274                        while (exclude) {
 275                                struct commit_list *n = exclude->next;
 276                                show_rev(REVERSED,
 277                                         exclude->item->object.sha1,NULL);
 278                                free(exclude);
 279                                exclude = n;
 280                        }
 281                }
 282                *dotdot = '.';
 283                return 1;
 284        }
 285        *dotdot = '.';
 286        return 0;
 287}
 288
 289static int try_parent_shorthands(const char *arg)
 290{
 291        char *dotdot;
 292        unsigned char sha1[20];
 293        struct commit *commit;
 294        struct commit_list *parents;
 295        int parents_only;
 296
 297        if ((dotdot = strstr(arg, "^!")))
 298                parents_only = 0;
 299        else if ((dotdot = strstr(arg, "^@")))
 300                parents_only = 1;
 301
 302        if (!dotdot || dotdot[2])
 303                return 0;
 304
 305        *dotdot = 0;
 306        if (get_sha1_committish(arg, sha1)) {
 307                *dotdot = '^';
 308                return 0;
 309        }
 310
 311        if (!parents_only)
 312                show_rev(NORMAL, sha1, arg);
 313        commit = lookup_commit_reference(sha1);
 314        for (parents = commit->parents; parents; parents = parents->next)
 315                show_rev(parents_only ? NORMAL : REVERSED,
 316                                parents->item->object.sha1, arg);
 317
 318        *dotdot = '^';
 319        return 1;
 320}
 321
 322static int parseopt_dump(const struct option *o, const char *arg, int unset)
 323{
 324        struct strbuf *parsed = o->value;
 325        if (unset)
 326                strbuf_addf(parsed, " --no-%s", o->long_name);
 327        else if (o->short_name)
 328                strbuf_addf(parsed, " -%c", o->short_name);
 329        else
 330                strbuf_addf(parsed, " --%s", o->long_name);
 331        if (arg) {
 332                strbuf_addch(parsed, ' ');
 333                sq_quote_buf(parsed, arg);
 334        }
 335        return 0;
 336}
 337
 338static const char *skipspaces(const char *s)
 339{
 340        while (isspace(*s))
 341                s++;
 342        return s;
 343}
 344
 345static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 346{
 347        static int keep_dashdash = 0, stop_at_non_option = 0;
 348        static char const * const parseopt_usage[] = {
 349                N_("git rev-parse --parseopt [options] -- [<args>...]"),
 350                NULL
 351        };
 352        static struct option parseopt_opts[] = {
 353                OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 354                                        N_("keep the `--` passed as an arg")),
 355                OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 356                                        N_("stop parsing after the "
 357                                           "first non-option argument")),
 358                OPT_END(),
 359        };
 360
 361        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 362        const char **usage = NULL;
 363        struct option *opts = NULL;
 364        int onb = 0, osz = 0, unb = 0, usz = 0;
 365
 366        strbuf_addstr(&parsed, "set --");
 367        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 368                             PARSE_OPT_KEEP_DASHDASH);
 369        if (argc < 1 || strcmp(argv[0], "--"))
 370                usage_with_options(parseopt_usage, parseopt_opts);
 371
 372        /* get the usage up to the first line with a -- on it */
 373        for (;;) {
 374                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 375                        die("premature end of input");
 376                ALLOC_GROW(usage, unb + 1, usz);
 377                if (!strcmp("--", sb.buf)) {
 378                        if (unb < 1)
 379                                die("no usage string given before the `--' separator");
 380                        usage[unb] = NULL;
 381                        break;
 382                }
 383                usage[unb++] = strbuf_detach(&sb, NULL);
 384        }
 385
 386        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 387        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 388                const char *s;
 389                struct option *o;
 390
 391                if (!sb.len)
 392                        continue;
 393
 394                ALLOC_GROW(opts, onb + 1, osz);
 395                memset(opts + onb, 0, sizeof(opts[onb]));
 396
 397                o = &opts[onb++];
 398                s = strchr(sb.buf, ' ');
 399                if (!s || *sb.buf == ' ') {
 400                        o->type = OPTION_GROUP;
 401                        o->help = xstrdup(skipspaces(sb.buf));
 402                        continue;
 403                }
 404
 405                o->type = OPTION_CALLBACK;
 406                o->help = xstrdup(skipspaces(s));
 407                o->value = &parsed;
 408                o->flags = PARSE_OPT_NOARG;
 409                o->callback = &parseopt_dump;
 410                while (s > sb.buf && strchr("*=?!", s[-1])) {
 411                        switch (*--s) {
 412                        case '=':
 413                                o->flags &= ~PARSE_OPT_NOARG;
 414                                break;
 415                        case '?':
 416                                o->flags &= ~PARSE_OPT_NOARG;
 417                                o->flags |= PARSE_OPT_OPTARG;
 418                                break;
 419                        case '!':
 420                                o->flags |= PARSE_OPT_NONEG;
 421                                break;
 422                        case '*':
 423                                o->flags |= PARSE_OPT_HIDDEN;
 424                                break;
 425                        }
 426                }
 427
 428                if (s - sb.buf == 1) /* short option only */
 429                        o->short_name = *sb.buf;
 430                else if (sb.buf[1] != ',') /* long option only */
 431                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 432                else {
 433                        o->short_name = *sb.buf;
 434                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 435                }
 436        }
 437        strbuf_release(&sb);
 438
 439        /* put an OPT_END() */
 440        ALLOC_GROW(opts, onb + 1, osz);
 441        memset(opts + onb, 0, sizeof(opts[onb]));
 442        argc = parse_options(argc, argv, prefix, opts, usage,
 443                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 444                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 445                        PARSE_OPT_SHELL_EVAL);
 446
 447        strbuf_addf(&parsed, " --");
 448        sq_quote_argv(&parsed, argv, 0);
 449        puts(parsed.buf);
 450        return 0;
 451}
 452
 453static int cmd_sq_quote(int argc, const char **argv)
 454{
 455        struct strbuf buf = STRBUF_INIT;
 456
 457        if (argc)
 458                sq_quote_argv(&buf, argv, 0);
 459        printf("%s\n", buf.buf);
 460        strbuf_release(&buf);
 461
 462        return 0;
 463}
 464
 465static void die_no_single_rev(int quiet)
 466{
 467        if (quiet)
 468                exit(1);
 469        else
 470                die("Needed a single revision");
 471}
 472
 473static const char builtin_rev_parse_usage[] =
 474N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 475   "   or: git rev-parse --sq-quote [<arg>...]\n"
 476   "   or: git rev-parse [options] [<arg>...]\n"
 477   "\n"
 478   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 479
 480int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 481{
 482        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 483        int has_dashdash = 0;
 484        int output_prefix = 0;
 485        unsigned char sha1[20];
 486        const char *name = NULL;
 487
 488        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 489                return cmd_parseopt(argc - 1, argv + 1, prefix);
 490
 491        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 492                return cmd_sq_quote(argc - 2, argv + 2);
 493
 494        if (argc > 1 && !strcmp("-h", argv[1]))
 495                usage(builtin_rev_parse_usage);
 496
 497        for (i = 1; i < argc; i++) {
 498                if (!strcmp(argv[i], "--")) {
 499                        has_dashdash = 1;
 500                        break;
 501                }
 502        }
 503
 504        prefix = setup_git_directory();
 505        git_config(git_default_config, NULL);
 506        for (i = 1; i < argc; i++) {
 507                const char *arg = argv[i];
 508
 509                if (as_is) {
 510                        if (show_file(arg, output_prefix) && as_is < 2)
 511                                verify_filename(prefix, arg, 0);
 512                        continue;
 513                }
 514                if (!strcmp(arg,"-n")) {
 515                        if (++i >= argc)
 516                                die("-n requires an argument");
 517                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 518                                show(arg);
 519                                show(argv[i]);
 520                        }
 521                        continue;
 522                }
 523                if (!prefixcmp(arg, "-n")) {
 524                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 525                                show(arg);
 526                        continue;
 527                }
 528
 529                if (*arg == '-') {
 530                        if (!strcmp(arg, "--")) {
 531                                as_is = 2;
 532                                /* Pass on the "--" if we show anything but files.. */
 533                                if (filter & (DO_FLAGS | DO_REVS))
 534                                        show_file(arg, 0);
 535                                continue;
 536                        }
 537                        if (!strcmp(arg, "--default")) {
 538                                def = argv[i+1];
 539                                i++;
 540                                continue;
 541                        }
 542                        if (!strcmp(arg, "--prefix")) {
 543                                prefix = argv[i+1];
 544                                startup_info->prefix = prefix;
 545                                output_prefix = 1;
 546                                i++;
 547                                continue;
 548                        }
 549                        if (!strcmp(arg, "--revs-only")) {
 550                                filter &= ~DO_NOREV;
 551                                continue;
 552                        }
 553                        if (!strcmp(arg, "--no-revs")) {
 554                                filter &= ~DO_REVS;
 555                                continue;
 556                        }
 557                        if (!strcmp(arg, "--flags")) {
 558                                filter &= ~DO_NONFLAGS;
 559                                continue;
 560                        }
 561                        if (!strcmp(arg, "--no-flags")) {
 562                                filter &= ~DO_FLAGS;
 563                                continue;
 564                        }
 565                        if (!strcmp(arg, "--verify")) {
 566                                filter &= ~(DO_FLAGS|DO_NOREV);
 567                                verify = 1;
 568                                continue;
 569                        }
 570                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 571                                quiet = 1;
 572                                continue;
 573                        }
 574                        if (!strcmp(arg, "--short") ||
 575                            !prefixcmp(arg, "--short=")) {
 576                                filter &= ~(DO_FLAGS|DO_NOREV);
 577                                verify = 1;
 578                                abbrev = DEFAULT_ABBREV;
 579                                if (arg[7] == '=')
 580                                        abbrev = strtoul(arg + 8, NULL, 10);
 581                                if (abbrev < MINIMUM_ABBREV)
 582                                        abbrev = MINIMUM_ABBREV;
 583                                else if (40 <= abbrev)
 584                                        abbrev = 40;
 585                                continue;
 586                        }
 587                        if (!strcmp(arg, "--sq")) {
 588                                output_sq = 1;
 589                                continue;
 590                        }
 591                        if (!strcmp(arg, "--not")) {
 592                                show_type ^= REVERSED;
 593                                continue;
 594                        }
 595                        if (!strcmp(arg, "--symbolic")) {
 596                                symbolic = SHOW_SYMBOLIC_ASIS;
 597                                continue;
 598                        }
 599                        if (!strcmp(arg, "--symbolic-full-name")) {
 600                                symbolic = SHOW_SYMBOLIC_FULL;
 601                                continue;
 602                        }
 603                        if (!prefixcmp(arg, "--abbrev-ref") &&
 604                            (!arg[12] || arg[12] == '=')) {
 605                                abbrev_ref = 1;
 606                                abbrev_ref_strict = warn_ambiguous_refs;
 607                                if (arg[12] == '=') {
 608                                        if (!strcmp(arg + 13, "strict"))
 609                                                abbrev_ref_strict = 1;
 610                                        else if (!strcmp(arg + 13, "loose"))
 611                                                abbrev_ref_strict = 0;
 612                                        else
 613                                                die("unknown mode for %s", arg);
 614                                }
 615                                continue;
 616                        }
 617                        if (!strcmp(arg, "--all")) {
 618                                for_each_ref(show_reference, NULL);
 619                                continue;
 620                        }
 621                        if (!prefixcmp(arg, "--disambiguate=")) {
 622                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 623                                continue;
 624                        }
 625                        if (!strcmp(arg, "--bisect")) {
 626                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 627                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 628                                continue;
 629                        }
 630                        if (!prefixcmp(arg, "--branches=")) {
 631                                for_each_glob_ref_in(show_reference, arg + 11,
 632                                        "refs/heads/", NULL);
 633                                continue;
 634                        }
 635                        if (!strcmp(arg, "--branches")) {
 636                                for_each_branch_ref(show_reference, NULL);
 637                                continue;
 638                        }
 639                        if (!prefixcmp(arg, "--tags=")) {
 640                                for_each_glob_ref_in(show_reference, arg + 7,
 641                                        "refs/tags/", NULL);
 642                                continue;
 643                        }
 644                        if (!strcmp(arg, "--tags")) {
 645                                for_each_tag_ref(show_reference, NULL);
 646                                continue;
 647                        }
 648                        if (!prefixcmp(arg, "--glob=")) {
 649                                for_each_glob_ref(show_reference, arg + 7, NULL);
 650                                continue;
 651                        }
 652                        if (!prefixcmp(arg, "--remotes=")) {
 653                                for_each_glob_ref_in(show_reference, arg + 10,
 654                                        "refs/remotes/", NULL);
 655                                continue;
 656                        }
 657                        if (!strcmp(arg, "--remotes")) {
 658                                for_each_remote_ref(show_reference, NULL);
 659                                continue;
 660                        }
 661                        if (!strcmp(arg, "--local-env-vars")) {
 662                                int i;
 663                                for (i = 0; local_repo_env[i]; i++)
 664                                        printf("%s\n", local_repo_env[i]);
 665                                continue;
 666                        }
 667                        if (!strcmp(arg, "--show-toplevel")) {
 668                                const char *work_tree = get_git_work_tree();
 669                                if (work_tree)
 670                                        puts(work_tree);
 671                                continue;
 672                        }
 673                        if (!strcmp(arg, "--show-prefix")) {
 674                                if (prefix)
 675                                        puts(prefix);
 676                                else
 677                                        putchar('\n');
 678                                continue;
 679                        }
 680                        if (!strcmp(arg, "--show-cdup")) {
 681                                const char *pfx = prefix;
 682                                if (!is_inside_work_tree()) {
 683                                        const char *work_tree =
 684                                                get_git_work_tree();
 685                                        if (work_tree)
 686                                                printf("%s\n", work_tree);
 687                                        continue;
 688                                }
 689                                while (pfx) {
 690                                        pfx = strchr(pfx, '/');
 691                                        if (pfx) {
 692                                                pfx++;
 693                                                printf("../");
 694                                        }
 695                                }
 696                                putchar('\n');
 697                                continue;
 698                        }
 699                        if (!strcmp(arg, "--git-dir")) {
 700                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 701                                static char cwd[PATH_MAX];
 702                                int len;
 703                                if (gitdir) {
 704                                        puts(gitdir);
 705                                        continue;
 706                                }
 707                                if (!prefix) {
 708                                        puts(".git");
 709                                        continue;
 710                                }
 711                                if (!getcwd(cwd, PATH_MAX))
 712                                        die_errno("unable to get current working directory");
 713                                len = strlen(cwd);
 714                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 715                                continue;
 716                        }
 717                        if (!strcmp(arg, "--resolve-git-dir")) {
 718                                const char *gitdir = resolve_gitdir(argv[i+1]);
 719                                if (!gitdir)
 720                                        die("not a gitdir '%s'", argv[i+1]);
 721                                puts(gitdir);
 722                                continue;
 723                        }
 724                        if (!strcmp(arg, "--is-inside-git-dir")) {
 725                                printf("%s\n", is_inside_git_dir() ? "true"
 726                                                : "false");
 727                                continue;
 728                        }
 729                        if (!strcmp(arg, "--is-inside-work-tree")) {
 730                                printf("%s\n", is_inside_work_tree() ? "true"
 731                                                : "false");
 732                                continue;
 733                        }
 734                        if (!strcmp(arg, "--is-bare-repository")) {
 735                                printf("%s\n", is_bare_repository() ? "true"
 736                                                : "false");
 737                                continue;
 738                        }
 739                        if (!prefixcmp(arg, "--since=")) {
 740                                show_datestring("--max-age=", arg+8);
 741                                continue;
 742                        }
 743                        if (!prefixcmp(arg, "--after=")) {
 744                                show_datestring("--max-age=", arg+8);
 745                                continue;
 746                        }
 747                        if (!prefixcmp(arg, "--before=")) {
 748                                show_datestring("--min-age=", arg+9);
 749                                continue;
 750                        }
 751                        if (!prefixcmp(arg, "--until=")) {
 752                                show_datestring("--min-age=", arg+8);
 753                                continue;
 754                        }
 755                        if (show_flag(arg) && verify)
 756                                die_no_single_rev(quiet);
 757                        continue;
 758                }
 759
 760                /* Not a flag argument */
 761                if (try_difference(arg))
 762                        continue;
 763                if (try_parent_shorthands(arg))
 764                        continue;
 765                name = arg;
 766                type = NORMAL;
 767                if (*arg == '^') {
 768                        name++;
 769                        type = REVERSED;
 770                }
 771                if (!get_sha1(name, sha1)) {
 772                        if (verify)
 773                                revs_count++;
 774                        else
 775                                show_rev(type, sha1, name);
 776                        continue;
 777                }
 778                if (verify)
 779                        die_no_single_rev(quiet);
 780                if (has_dashdash)
 781                        die("bad revision '%s'", arg);
 782                as_is = 1;
 783                if (!show_file(arg, output_prefix))
 784                        continue;
 785                verify_filename(prefix, arg, 1);
 786        }
 787        if (verify) {
 788                if (revs_count == 1) {
 789                        show_rev(type, sha1, name);
 790                        return 0;
 791                } else if (revs_count == 0 && show_default())
 792                        return 0;
 793                die_no_single_rev(quiet);
 794        } else
 795                show_default();
 796        return 0;
 797}