Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit name-rev: differentiate between tags and commits they point at (118aa4a)
   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                return 1;
 283        }
 284        *dotdot = '.';
 285        return 0;
 286}
 287
 288static int try_parent_shorthands(const char *arg)
 289{
 290        char *dotdot;
 291        unsigned char sha1[20];
 292        struct commit *commit;
 293        struct commit_list *parents;
 294        int parents_only;
 295
 296        if ((dotdot = strstr(arg, "^!")))
 297                parents_only = 0;
 298        else if ((dotdot = strstr(arg, "^@")))
 299                parents_only = 1;
 300
 301        if (!dotdot || dotdot[2])
 302                return 0;
 303
 304        *dotdot = 0;
 305        if (get_sha1_committish(arg, sha1))
 306                return 0;
 307
 308        if (!parents_only)
 309                show_rev(NORMAL, sha1, arg);
 310        commit = lookup_commit_reference(sha1);
 311        for (parents = commit->parents; parents; parents = parents->next)
 312                show_rev(parents_only ? NORMAL : REVERSED,
 313                                parents->item->object.sha1, arg);
 314
 315        return 1;
 316}
 317
 318static int parseopt_dump(const struct option *o, const char *arg, int unset)
 319{
 320        struct strbuf *parsed = o->value;
 321        if (unset)
 322                strbuf_addf(parsed, " --no-%s", o->long_name);
 323        else if (o->short_name)
 324                strbuf_addf(parsed, " -%c", o->short_name);
 325        else
 326                strbuf_addf(parsed, " --%s", o->long_name);
 327        if (arg) {
 328                strbuf_addch(parsed, ' ');
 329                sq_quote_buf(parsed, arg);
 330        }
 331        return 0;
 332}
 333
 334static const char *skipspaces(const char *s)
 335{
 336        while (isspace(*s))
 337                s++;
 338        return s;
 339}
 340
 341static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 342{
 343        static int keep_dashdash = 0, stop_at_non_option = 0;
 344        static char const * const parseopt_usage[] = {
 345                N_("git rev-parse --parseopt [options] -- [<args>...]"),
 346                NULL
 347        };
 348        static struct option parseopt_opts[] = {
 349                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 350                                        N_("keep the `--` passed as an arg")),
 351                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 352                                        N_("stop parsing after the "
 353                                           "first non-option argument")),
 354                OPT_END(),
 355        };
 356
 357        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 358        const char **usage = NULL;
 359        struct option *opts = NULL;
 360        int onb = 0, osz = 0, unb = 0, usz = 0;
 361
 362        strbuf_addstr(&parsed, "set --");
 363        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 364                             PARSE_OPT_KEEP_DASHDASH);
 365        if (argc < 1 || strcmp(argv[0], "--"))
 366                usage_with_options(parseopt_usage, parseopt_opts);
 367
 368        /* get the usage up to the first line with a -- on it */
 369        for (;;) {
 370                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 371                        die("premature end of input");
 372                ALLOC_GROW(usage, unb + 1, usz);
 373                if (!strcmp("--", sb.buf)) {
 374                        if (unb < 1)
 375                                die("no usage string given before the `--' separator");
 376                        usage[unb] = NULL;
 377                        break;
 378                }
 379                usage[unb++] = strbuf_detach(&sb, NULL);
 380        }
 381
 382        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 383        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 384                const char *s;
 385                struct option *o;
 386
 387                if (!sb.len)
 388                        continue;
 389
 390                ALLOC_GROW(opts, onb + 1, osz);
 391                memset(opts + onb, 0, sizeof(opts[onb]));
 392
 393                o = &opts[onb++];
 394                s = strchr(sb.buf, ' ');
 395                if (!s || *sb.buf == ' ') {
 396                        o->type = OPTION_GROUP;
 397                        o->help = xstrdup(skipspaces(sb.buf));
 398                        continue;
 399                }
 400
 401                o->type = OPTION_CALLBACK;
 402                o->help = xstrdup(skipspaces(s));
 403                o->value = &parsed;
 404                o->flags = PARSE_OPT_NOARG;
 405                o->callback = &parseopt_dump;
 406                while (s > sb.buf && strchr("*=?!", s[-1])) {
 407                        switch (*--s) {
 408                        case '=':
 409                                o->flags &= ~PARSE_OPT_NOARG;
 410                                break;
 411                        case '?':
 412                                o->flags &= ~PARSE_OPT_NOARG;
 413                                o->flags |= PARSE_OPT_OPTARG;
 414                                break;
 415                        case '!':
 416                                o->flags |= PARSE_OPT_NONEG;
 417                                break;
 418                        case '*':
 419                                o->flags |= PARSE_OPT_HIDDEN;
 420                                break;
 421                        }
 422                }
 423
 424                if (s - sb.buf == 1) /* short option only */
 425                        o->short_name = *sb.buf;
 426                else if (sb.buf[1] != ',') /* long option only */
 427                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 428                else {
 429                        o->short_name = *sb.buf;
 430                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 431                }
 432        }
 433        strbuf_release(&sb);
 434
 435        /* put an OPT_END() */
 436        ALLOC_GROW(opts, onb + 1, osz);
 437        memset(opts + onb, 0, sizeof(opts[onb]));
 438        argc = parse_options(argc, argv, prefix, opts, usage,
 439                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 440                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 441                        PARSE_OPT_SHELL_EVAL);
 442
 443        strbuf_addf(&parsed, " --");
 444        sq_quote_argv(&parsed, argv, 0);
 445        puts(parsed.buf);
 446        return 0;
 447}
 448
 449static int cmd_sq_quote(int argc, const char **argv)
 450{
 451        struct strbuf buf = STRBUF_INIT;
 452
 453        if (argc)
 454                sq_quote_argv(&buf, argv, 0);
 455        printf("%s\n", buf.buf);
 456        strbuf_release(&buf);
 457
 458        return 0;
 459}
 460
 461static void die_no_single_rev(int quiet)
 462{
 463        if (quiet)
 464                exit(1);
 465        else
 466                die("Needed a single revision");
 467}
 468
 469static const char builtin_rev_parse_usage[] =
 470N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 471   "   or: git rev-parse --sq-quote [<arg>...]\n"
 472   "   or: git rev-parse [options] [<arg>...]\n"
 473   "\n"
 474   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 475
 476int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 477{
 478        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 479        int output_prefix = 0;
 480        unsigned char sha1[20];
 481        const char *name = NULL;
 482
 483        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 484                return cmd_parseopt(argc - 1, argv + 1, prefix);
 485
 486        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 487                return cmd_sq_quote(argc - 2, argv + 2);
 488
 489        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 490                int i;
 491                for (i = 0; local_repo_env[i]; i++)
 492                        printf("%s\n", local_repo_env[i]);
 493                return 0;
 494        }
 495
 496        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 497                const char *gitdir = resolve_gitdir(argv[2]);
 498                if (!gitdir)
 499                        die("not a gitdir '%s'", argv[2]);
 500                puts(gitdir);
 501                return 0;
 502        }
 503
 504        if (argc > 1 && !strcmp("-h", argv[1]))
 505                usage(builtin_rev_parse_usage);
 506
 507        prefix = setup_git_directory();
 508        git_config(git_default_config, NULL);
 509        for (i = 1; i < argc; i++) {
 510                const char *arg = argv[i];
 511
 512                if (as_is) {
 513                        if (show_file(arg, output_prefix) && as_is < 2)
 514                                verify_filename(prefix, arg, 0);
 515                        continue;
 516                }
 517                if (!strcmp(arg,"-n")) {
 518                        if (++i >= argc)
 519                                die("-n requires an argument");
 520                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 521                                show(arg);
 522                                show(argv[i]);
 523                        }
 524                        continue;
 525                }
 526                if (!prefixcmp(arg, "-n")) {
 527                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 528                                show(arg);
 529                        continue;
 530                }
 531
 532                if (*arg == '-') {
 533                        if (!strcmp(arg, "--")) {
 534                                as_is = 2;
 535                                /* Pass on the "--" if we show anything but files.. */
 536                                if (filter & (DO_FLAGS | DO_REVS))
 537                                        show_file(arg, 0);
 538                                continue;
 539                        }
 540                        if (!strcmp(arg, "--default")) {
 541                                def = argv[i+1];
 542                                i++;
 543                                continue;
 544                        }
 545                        if (!strcmp(arg, "--prefix")) {
 546                                prefix = argv[i+1];
 547                                startup_info->prefix = prefix;
 548                                output_prefix = 1;
 549                                i++;
 550                                continue;
 551                        }
 552                        if (!strcmp(arg, "--revs-only")) {
 553                                filter &= ~DO_NOREV;
 554                                continue;
 555                        }
 556                        if (!strcmp(arg, "--no-revs")) {
 557                                filter &= ~DO_REVS;
 558                                continue;
 559                        }
 560                        if (!strcmp(arg, "--flags")) {
 561                                filter &= ~DO_NONFLAGS;
 562                                continue;
 563                        }
 564                        if (!strcmp(arg, "--no-flags")) {
 565                                filter &= ~DO_FLAGS;
 566                                continue;
 567                        }
 568                        if (!strcmp(arg, "--verify")) {
 569                                filter &= ~(DO_FLAGS|DO_NOREV);
 570                                verify = 1;
 571                                continue;
 572                        }
 573                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 574                                quiet = 1;
 575                                continue;
 576                        }
 577                        if (!strcmp(arg, "--short") ||
 578                            !prefixcmp(arg, "--short=")) {
 579                                filter &= ~(DO_FLAGS|DO_NOREV);
 580                                verify = 1;
 581                                abbrev = DEFAULT_ABBREV;
 582                                if (arg[7] == '=')
 583                                        abbrev = strtoul(arg + 8, NULL, 10);
 584                                if (abbrev < MINIMUM_ABBREV)
 585                                        abbrev = MINIMUM_ABBREV;
 586                                else if (40 <= abbrev)
 587                                        abbrev = 40;
 588                                continue;
 589                        }
 590                        if (!strcmp(arg, "--sq")) {
 591                                output_sq = 1;
 592                                continue;
 593                        }
 594                        if (!strcmp(arg, "--not")) {
 595                                show_type ^= REVERSED;
 596                                continue;
 597                        }
 598                        if (!strcmp(arg, "--symbolic")) {
 599                                symbolic = SHOW_SYMBOLIC_ASIS;
 600                                continue;
 601                        }
 602                        if (!strcmp(arg, "--symbolic-full-name")) {
 603                                symbolic = SHOW_SYMBOLIC_FULL;
 604                                continue;
 605                        }
 606                        if (!prefixcmp(arg, "--abbrev-ref") &&
 607                            (!arg[12] || arg[12] == '=')) {
 608                                abbrev_ref = 1;
 609                                abbrev_ref_strict = warn_ambiguous_refs;
 610                                if (arg[12] == '=') {
 611                                        if (!strcmp(arg + 13, "strict"))
 612                                                abbrev_ref_strict = 1;
 613                                        else if (!strcmp(arg + 13, "loose"))
 614                                                abbrev_ref_strict = 0;
 615                                        else
 616                                                die("unknown mode for %s", arg);
 617                                }
 618                                continue;
 619                        }
 620                        if (!strcmp(arg, "--all")) {
 621                                for_each_ref(show_reference, NULL);
 622                                continue;
 623                        }
 624                        if (!prefixcmp(arg, "--disambiguate=")) {
 625                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 626                                continue;
 627                        }
 628                        if (!strcmp(arg, "--bisect")) {
 629                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 630                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 631                                continue;
 632                        }
 633                        if (!prefixcmp(arg, "--branches=")) {
 634                                for_each_glob_ref_in(show_reference, arg + 11,
 635                                        "refs/heads/", NULL);
 636                                continue;
 637                        }
 638                        if (!strcmp(arg, "--branches")) {
 639                                for_each_branch_ref(show_reference, NULL);
 640                                continue;
 641                        }
 642                        if (!prefixcmp(arg, "--tags=")) {
 643                                for_each_glob_ref_in(show_reference, arg + 7,
 644                                        "refs/tags/", NULL);
 645                                continue;
 646                        }
 647                        if (!strcmp(arg, "--tags")) {
 648                                for_each_tag_ref(show_reference, NULL);
 649                                continue;
 650                        }
 651                        if (!prefixcmp(arg, "--glob=")) {
 652                                for_each_glob_ref(show_reference, arg + 7, NULL);
 653                                continue;
 654                        }
 655                        if (!prefixcmp(arg, "--remotes=")) {
 656                                for_each_glob_ref_in(show_reference, arg + 10,
 657                                        "refs/remotes/", NULL);
 658                                continue;
 659                        }
 660                        if (!strcmp(arg, "--remotes")) {
 661                                for_each_remote_ref(show_reference, NULL);
 662                                continue;
 663                        }
 664                        if (!strcmp(arg, "--show-toplevel")) {
 665                                const char *work_tree = get_git_work_tree();
 666                                if (work_tree)
 667                                        puts(work_tree);
 668                                continue;
 669                        }
 670                        if (!strcmp(arg, "--show-prefix")) {
 671                                if (prefix)
 672                                        puts(prefix);
 673                                else
 674                                        putchar('\n');
 675                                continue;
 676                        }
 677                        if (!strcmp(arg, "--show-cdup")) {
 678                                const char *pfx = prefix;
 679                                if (!is_inside_work_tree()) {
 680                                        const char *work_tree =
 681                                                get_git_work_tree();
 682                                        if (work_tree)
 683                                                printf("%s\n", work_tree);
 684                                        continue;
 685                                }
 686                                while (pfx) {
 687                                        pfx = strchr(pfx, '/');
 688                                        if (pfx) {
 689                                                pfx++;
 690                                                printf("../");
 691                                        }
 692                                }
 693                                putchar('\n');
 694                                continue;
 695                        }
 696                        if (!strcmp(arg, "--git-dir")) {
 697                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 698                                static char cwd[PATH_MAX];
 699                                int len;
 700                                if (gitdir) {
 701                                        puts(gitdir);
 702                                        continue;
 703                                }
 704                                if (!prefix) {
 705                                        puts(".git");
 706                                        continue;
 707                                }
 708                                if (!getcwd(cwd, PATH_MAX))
 709                                        die_errno("unable to get current working directory");
 710                                len = strlen(cwd);
 711                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 712                                continue;
 713                        }
 714                        if (!strcmp(arg, "--is-inside-git-dir")) {
 715                                printf("%s\n", is_inside_git_dir() ? "true"
 716                                                : "false");
 717                                continue;
 718                        }
 719                        if (!strcmp(arg, "--is-inside-work-tree")) {
 720                                printf("%s\n", is_inside_work_tree() ? "true"
 721                                                : "false");
 722                                continue;
 723                        }
 724                        if (!strcmp(arg, "--is-bare-repository")) {
 725                                printf("%s\n", is_bare_repository() ? "true"
 726                                                : "false");
 727                                continue;
 728                        }
 729                        if (!prefixcmp(arg, "--since=")) {
 730                                show_datestring("--max-age=", arg+8);
 731                                continue;
 732                        }
 733                        if (!prefixcmp(arg, "--after=")) {
 734                                show_datestring("--max-age=", arg+8);
 735                                continue;
 736                        }
 737                        if (!prefixcmp(arg, "--before=")) {
 738                                show_datestring("--min-age=", arg+9);
 739                                continue;
 740                        }
 741                        if (!prefixcmp(arg, "--until=")) {
 742                                show_datestring("--min-age=", arg+8);
 743                                continue;
 744                        }
 745                        if (show_flag(arg) && verify)
 746                                die_no_single_rev(quiet);
 747                        continue;
 748                }
 749
 750                /* Not a flag argument */
 751                if (try_difference(arg))
 752                        continue;
 753                if (try_parent_shorthands(arg))
 754                        continue;
 755                name = arg;
 756                type = NORMAL;
 757                if (*arg == '^') {
 758                        name++;
 759                        type = REVERSED;
 760                }
 761                if (!get_sha1(name, sha1)) {
 762                        if (verify)
 763                                revs_count++;
 764                        else
 765                                show_rev(type, sha1, name);
 766                        continue;
 767                }
 768                if (verify)
 769                        die_no_single_rev(quiet);
 770                as_is = 1;
 771                if (!show_file(arg, output_prefix))
 772                        continue;
 773                verify_filename(prefix, arg, 1);
 774        }
 775        if (verify) {
 776                if (revs_count == 1) {
 777                        show_rev(type, sha1, name);
 778                        return 0;
 779                } else if (revs_count == 0 && show_default())
 780                        return 0;
 781                die_no_single_rev(quiet);
 782        } else
 783                show_default();
 784        return 0;
 785}