Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit rev-parse: introduce --exclude=<glob> to tame wildcards (9dc01bf)
   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
  15#define DO_REVS         1
  16#define DO_NOREV        2
  17#define DO_FLAGS        4
  18#define DO_NONFLAGS     8
  19static int filter = ~0;
  20
  21static const char *def;
  22
  23#define NORMAL 0
  24#define REVERSED 1
  25static int show_type = NORMAL;
  26
  27#define SHOW_SYMBOLIC_ASIS 1
  28#define SHOW_SYMBOLIC_FULL 2
  29static int symbolic;
  30static int abbrev;
  31static int abbrev_ref;
  32static int abbrev_ref_strict;
  33static int output_sq;
  34
  35static struct string_list *ref_excludes;
  36
  37/*
  38 * Some arguments are relevant "revision" arguments,
  39 * others are about output format or other details.
  40 * This sorts it all out.
  41 */
  42static int is_rev_argument(const char *arg)
  43{
  44        static const char *rev_args[] = {
  45                "--all",
  46                "--bisect",
  47                "--dense",
  48                "--branches=",
  49                "--branches",
  50                "--header",
  51                "--ignore-missing",
  52                "--max-age=",
  53                "--max-count=",
  54                "--min-age=",
  55                "--no-merges",
  56                "--min-parents=",
  57                "--no-min-parents",
  58                "--max-parents=",
  59                "--no-max-parents",
  60                "--objects",
  61                "--objects-edge",
  62                "--parents",
  63                "--pretty",
  64                "--remotes=",
  65                "--remotes",
  66                "--glob=",
  67                "--sparse",
  68                "--tags=",
  69                "--tags",
  70                "--topo-order",
  71                "--date-order",
  72                "--unpacked",
  73                NULL
  74        };
  75        const char **p = rev_args;
  76
  77        /* accept -<digit>, like traditional "head" */
  78        if ((*arg == '-') && isdigit(arg[1]))
  79                return 1;
  80
  81        for (;;) {
  82                const char *str = *p++;
  83                int len;
  84                if (!str)
  85                        return 0;
  86                len = strlen(str);
  87                if (!strcmp(arg, str) ||
  88                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  89                        return 1;
  90        }
  91}
  92
  93/* Output argument as a string, either SQ or normal */
  94static void show(const char *arg)
  95{
  96        if (output_sq) {
  97                int sq = '\'', ch;
  98
  99                putchar(sq);
 100                while ((ch = *arg++)) {
 101                        if (ch == sq)
 102                                fputs("'\\'", stdout);
 103                        putchar(ch);
 104                }
 105                putchar(sq);
 106                putchar(' ');
 107        }
 108        else
 109                puts(arg);
 110}
 111
 112/* Like show(), but with a negation prefix according to type */
 113static void show_with_type(int type, const char *arg)
 114{
 115        if (type != show_type)
 116                putchar('^');
 117        show(arg);
 118}
 119
 120/* Output a revision, only if filter allows it */
 121static void show_rev(int type, const unsigned char *sha1, const char *name)
 122{
 123        if (!(filter & DO_REVS))
 124                return;
 125        def = NULL;
 126
 127        if ((symbolic || abbrev_ref) && name) {
 128                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 129                        unsigned char discard[20];
 130                        char *full;
 131
 132                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 133                        case 0:
 134                                /*
 135                                 * Not found -- not a ref.  We could
 136                                 * emit "name" here, but symbolic-full
 137                                 * users are interested in finding the
 138                                 * refs spelled in full, and they would
 139                                 * need to filter non-refs if we did so.
 140                                 */
 141                                break;
 142                        case 1: /* happy */
 143                                if (abbrev_ref)
 144                                        full = shorten_unambiguous_ref(full,
 145                                                abbrev_ref_strict);
 146                                show_with_type(type, full);
 147                                break;
 148                        default: /* ambiguous */
 149                                error("refname '%s' is ambiguous", name);
 150                                break;
 151                        }
 152                } else {
 153                        show_with_type(type, name);
 154                }
 155        }
 156        else if (abbrev)
 157                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 158        else
 159                show_with_type(type, sha1_to_hex(sha1));
 160}
 161
 162/* Output a flag, only if filter allows it. */
 163static int show_flag(const char *arg)
 164{
 165        if (!(filter & DO_FLAGS))
 166                return 0;
 167        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 168                show(arg);
 169                return 1;
 170        }
 171        return 0;
 172}
 173
 174static int show_default(void)
 175{
 176        const char *s = def;
 177
 178        if (s) {
 179                unsigned char sha1[20];
 180
 181                def = NULL;
 182                if (!get_sha1(s, sha1)) {
 183                        show_rev(NORMAL, sha1, s);
 184                        return 1;
 185                }
 186        }
 187        return 0;
 188}
 189
 190static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 191{
 192        if (ref_excluded(ref_excludes, refname))
 193                return 0;
 194        show_rev(NORMAL, sha1, refname);
 195        return 0;
 196}
 197
 198static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 199{
 200        show_rev(REVERSED, sha1, refname);
 201        return 0;
 202}
 203
 204static int show_abbrev(const unsigned char *sha1, void *cb_data)
 205{
 206        show_rev(NORMAL, sha1, NULL);
 207        return 0;
 208}
 209
 210static void show_datestring(const char *flag, const char *datestr)
 211{
 212        static char buffer[100];
 213
 214        /* date handling requires both flags and revs */
 215        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 216                return;
 217        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 218        show(buffer);
 219}
 220
 221static int show_file(const char *arg, int output_prefix)
 222{
 223        show_default();
 224        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 225                if (output_prefix) {
 226                        const char *prefix = startup_info->prefix;
 227                        show(prefix_filename(prefix,
 228                                             prefix ? strlen(prefix) : 0,
 229                                             arg));
 230                } else
 231                        show(arg);
 232                return 1;
 233        }
 234        return 0;
 235}
 236
 237static int try_difference(const char *arg)
 238{
 239        char *dotdot;
 240        unsigned char sha1[20];
 241        unsigned char end[20];
 242        const char *next;
 243        const char *this;
 244        int symmetric;
 245        static const char head_by_default[] = "HEAD";
 246
 247        if (!(dotdot = strstr(arg, "..")))
 248                return 0;
 249        next = dotdot + 2;
 250        this = arg;
 251        symmetric = (*next == '.');
 252
 253        *dotdot = 0;
 254        next += symmetric;
 255
 256        if (!*next)
 257                next = head_by_default;
 258        if (dotdot == arg)
 259                this = head_by_default;
 260
 261        if (this == head_by_default && next == head_by_default &&
 262            !symmetric) {
 263                /*
 264                 * Just ".."?  That is not a range but the
 265                 * pathspec for the parent directory.
 266                 */
 267                *dotdot = '.';
 268                return 0;
 269        }
 270
 271        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 272                show_rev(NORMAL, end, next);
 273                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 274                if (symmetric) {
 275                        struct commit_list *exclude;
 276                        struct commit *a, *b;
 277                        a = lookup_commit_reference(sha1);
 278                        b = lookup_commit_reference(end);
 279                        exclude = get_merge_bases(a, b, 1);
 280                        while (exclude) {
 281                                struct commit_list *n = exclude->next;
 282                                show_rev(REVERSED,
 283                                         exclude->item->object.sha1,NULL);
 284                                free(exclude);
 285                                exclude = n;
 286                        }
 287                }
 288                return 1;
 289        }
 290        *dotdot = '.';
 291        return 0;
 292}
 293
 294static int try_parent_shorthands(const char *arg)
 295{
 296        char *dotdot;
 297        unsigned char sha1[20];
 298        struct commit *commit;
 299        struct commit_list *parents;
 300        int parents_only;
 301
 302        if ((dotdot = strstr(arg, "^!")))
 303                parents_only = 0;
 304        else if ((dotdot = strstr(arg, "^@")))
 305                parents_only = 1;
 306
 307        if (!dotdot || dotdot[2])
 308                return 0;
 309
 310        *dotdot = 0;
 311        if (get_sha1_committish(arg, sha1))
 312                return 0;
 313
 314        if (!parents_only)
 315                show_rev(NORMAL, sha1, arg);
 316        commit = lookup_commit_reference(sha1);
 317        for (parents = commit->parents; parents; parents = parents->next)
 318                show_rev(parents_only ? NORMAL : REVERSED,
 319                                parents->item->object.sha1, arg);
 320
 321        return 1;
 322}
 323
 324static int parseopt_dump(const struct option *o, const char *arg, int unset)
 325{
 326        struct strbuf *parsed = o->value;
 327        if (unset)
 328                strbuf_addf(parsed, " --no-%s", o->long_name);
 329        else if (o->short_name)
 330                strbuf_addf(parsed, " -%c", o->short_name);
 331        else
 332                strbuf_addf(parsed, " --%s", o->long_name);
 333        if (arg) {
 334                strbuf_addch(parsed, ' ');
 335                sq_quote_buf(parsed, arg);
 336        }
 337        return 0;
 338}
 339
 340static const char *skipspaces(const char *s)
 341{
 342        while (isspace(*s))
 343                s++;
 344        return s;
 345}
 346
 347static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 348{
 349        static int keep_dashdash = 0, stop_at_non_option = 0;
 350        static char const * const parseopt_usage[] = {
 351                N_("git rev-parse --parseopt [options] -- [<args>...]"),
 352                NULL
 353        };
 354        static struct option parseopt_opts[] = {
 355                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 356                                        N_("keep the `--` passed as an arg")),
 357                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 358                                        N_("stop parsing after the "
 359                                           "first non-option argument")),
 360                OPT_END(),
 361        };
 362
 363        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 364        const char **usage = NULL;
 365        struct option *opts = NULL;
 366        int onb = 0, osz = 0, unb = 0, usz = 0;
 367
 368        strbuf_addstr(&parsed, "set --");
 369        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 370                             PARSE_OPT_KEEP_DASHDASH);
 371        if (argc < 1 || strcmp(argv[0], "--"))
 372                usage_with_options(parseopt_usage, parseopt_opts);
 373
 374        /* get the usage up to the first line with a -- on it */
 375        for (;;) {
 376                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 377                        die("premature end of input");
 378                ALLOC_GROW(usage, unb + 1, usz);
 379                if (!strcmp("--", sb.buf)) {
 380                        if (unb < 1)
 381                                die("no usage string given before the `--' separator");
 382                        usage[unb] = NULL;
 383                        break;
 384                }
 385                usage[unb++] = strbuf_detach(&sb, NULL);
 386        }
 387
 388        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 389        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 390                const char *s;
 391                struct option *o;
 392
 393                if (!sb.len)
 394                        continue;
 395
 396                ALLOC_GROW(opts, onb + 1, osz);
 397                memset(opts + onb, 0, sizeof(opts[onb]));
 398
 399                o = &opts[onb++];
 400                s = strchr(sb.buf, ' ');
 401                if (!s || *sb.buf == ' ') {
 402                        o->type = OPTION_GROUP;
 403                        o->help = xstrdup(skipspaces(sb.buf));
 404                        continue;
 405                }
 406
 407                o->type = OPTION_CALLBACK;
 408                o->help = xstrdup(skipspaces(s));
 409                o->value = &parsed;
 410                o->flags = PARSE_OPT_NOARG;
 411                o->callback = &parseopt_dump;
 412                while (s > sb.buf && strchr("*=?!", s[-1])) {
 413                        switch (*--s) {
 414                        case '=':
 415                                o->flags &= ~PARSE_OPT_NOARG;
 416                                break;
 417                        case '?':
 418                                o->flags &= ~PARSE_OPT_NOARG;
 419                                o->flags |= PARSE_OPT_OPTARG;
 420                                break;
 421                        case '!':
 422                                o->flags |= PARSE_OPT_NONEG;
 423                                break;
 424                        case '*':
 425                                o->flags |= PARSE_OPT_HIDDEN;
 426                                break;
 427                        }
 428                }
 429
 430                if (s - sb.buf == 1) /* short option only */
 431                        o->short_name = *sb.buf;
 432                else if (sb.buf[1] != ',') /* long option only */
 433                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 434                else {
 435                        o->short_name = *sb.buf;
 436                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 437                }
 438        }
 439        strbuf_release(&sb);
 440
 441        /* put an OPT_END() */
 442        ALLOC_GROW(opts, onb + 1, osz);
 443        memset(opts + onb, 0, sizeof(opts[onb]));
 444        argc = parse_options(argc, argv, prefix, opts, usage,
 445                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 446                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 447                        PARSE_OPT_SHELL_EVAL);
 448
 449        strbuf_addf(&parsed, " --");
 450        sq_quote_argv(&parsed, argv, 0);
 451        puts(parsed.buf);
 452        return 0;
 453}
 454
 455static int cmd_sq_quote(int argc, const char **argv)
 456{
 457        struct strbuf buf = STRBUF_INIT;
 458
 459        if (argc)
 460                sq_quote_argv(&buf, argv, 0);
 461        printf("%s\n", buf.buf);
 462        strbuf_release(&buf);
 463
 464        return 0;
 465}
 466
 467static void die_no_single_rev(int quiet)
 468{
 469        if (quiet)
 470                exit(1);
 471        else
 472                die("Needed a single revision");
 473}
 474
 475static const char builtin_rev_parse_usage[] =
 476N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 477   "   or: git rev-parse --sq-quote [<arg>...]\n"
 478   "   or: git rev-parse [options] [<arg>...]\n"
 479   "\n"
 480   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 481
 482int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 483{
 484        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 485        int output_prefix = 0;
 486        unsigned char sha1[20];
 487        const char *name = NULL;
 488
 489        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 490                return cmd_parseopt(argc - 1, argv + 1, prefix);
 491
 492        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 493                return cmd_sq_quote(argc - 2, argv + 2);
 494
 495        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 496                int i;
 497                for (i = 0; local_repo_env[i]; i++)
 498                        printf("%s\n", local_repo_env[i]);
 499                return 0;
 500        }
 501
 502        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 503                const char *gitdir = resolve_gitdir(argv[2]);
 504                if (!gitdir)
 505                        die("not a gitdir '%s'", argv[2]);
 506                puts(gitdir);
 507                return 0;
 508        }
 509
 510        if (argc > 1 && !strcmp("-h", argv[1]))
 511                usage(builtin_rev_parse_usage);
 512
 513        prefix = setup_git_directory();
 514        git_config(git_default_config, NULL);
 515        for (i = 1; i < argc; i++) {
 516                const char *arg = argv[i];
 517
 518                if (as_is) {
 519                        if (show_file(arg, output_prefix) && as_is < 2)
 520                                verify_filename(prefix, arg, 0);
 521                        continue;
 522                }
 523                if (!strcmp(arg,"-n")) {
 524                        if (++i >= argc)
 525                                die("-n requires an argument");
 526                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 527                                show(arg);
 528                                show(argv[i]);
 529                        }
 530                        continue;
 531                }
 532                if (!prefixcmp(arg, "-n")) {
 533                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 534                                show(arg);
 535                        continue;
 536                }
 537
 538                if (*arg == '-') {
 539                        if (!strcmp(arg, "--")) {
 540                                as_is = 2;
 541                                /* Pass on the "--" if we show anything but files.. */
 542                                if (filter & (DO_FLAGS | DO_REVS))
 543                                        show_file(arg, 0);
 544                                continue;
 545                        }
 546                        if (!strcmp(arg, "--default")) {
 547                                def = argv[i+1];
 548                                i++;
 549                                continue;
 550                        }
 551                        if (!strcmp(arg, "--prefix")) {
 552                                prefix = argv[i+1];
 553                                startup_info->prefix = prefix;
 554                                output_prefix = 1;
 555                                i++;
 556                                continue;
 557                        }
 558                        if (!strcmp(arg, "--revs-only")) {
 559                                filter &= ~DO_NOREV;
 560                                continue;
 561                        }
 562                        if (!strcmp(arg, "--no-revs")) {
 563                                filter &= ~DO_REVS;
 564                                continue;
 565                        }
 566                        if (!strcmp(arg, "--flags")) {
 567                                filter &= ~DO_NONFLAGS;
 568                                continue;
 569                        }
 570                        if (!strcmp(arg, "--no-flags")) {
 571                                filter &= ~DO_FLAGS;
 572                                continue;
 573                        }
 574                        if (!strcmp(arg, "--verify")) {
 575                                filter &= ~(DO_FLAGS|DO_NOREV);
 576                                verify = 1;
 577                                continue;
 578                        }
 579                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 580                                quiet = 1;
 581                                continue;
 582                        }
 583                        if (!strcmp(arg, "--short") ||
 584                            !prefixcmp(arg, "--short=")) {
 585                                filter &= ~(DO_FLAGS|DO_NOREV);
 586                                verify = 1;
 587                                abbrev = DEFAULT_ABBREV;
 588                                if (arg[7] == '=')
 589                                        abbrev = strtoul(arg + 8, NULL, 10);
 590                                if (abbrev < MINIMUM_ABBREV)
 591                                        abbrev = MINIMUM_ABBREV;
 592                                else if (40 <= abbrev)
 593                                        abbrev = 40;
 594                                continue;
 595                        }
 596                        if (!strcmp(arg, "--sq")) {
 597                                output_sq = 1;
 598                                continue;
 599                        }
 600                        if (!strcmp(arg, "--not")) {
 601                                show_type ^= REVERSED;
 602                                continue;
 603                        }
 604                        if (!strcmp(arg, "--symbolic")) {
 605                                symbolic = SHOW_SYMBOLIC_ASIS;
 606                                continue;
 607                        }
 608                        if (!strcmp(arg, "--symbolic-full-name")) {
 609                                symbolic = SHOW_SYMBOLIC_FULL;
 610                                continue;
 611                        }
 612                        if (!prefixcmp(arg, "--abbrev-ref") &&
 613                            (!arg[12] || arg[12] == '=')) {
 614                                abbrev_ref = 1;
 615                                abbrev_ref_strict = warn_ambiguous_refs;
 616                                if (arg[12] == '=') {
 617                                        if (!strcmp(arg + 13, "strict"))
 618                                                abbrev_ref_strict = 1;
 619                                        else if (!strcmp(arg + 13, "loose"))
 620                                                abbrev_ref_strict = 0;
 621                                        else
 622                                                die("unknown mode for %s", arg);
 623                                }
 624                                continue;
 625                        }
 626                        if (!strcmp(arg, "--all")) {
 627                                for_each_ref(show_reference, NULL);
 628                                continue;
 629                        }
 630                        if (!prefixcmp(arg, "--disambiguate=")) {
 631                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 632                                continue;
 633                        }
 634                        if (!strcmp(arg, "--bisect")) {
 635                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 636                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 637                                continue;
 638                        }
 639                        if (!prefixcmp(arg, "--branches=")) {
 640                                for_each_glob_ref_in(show_reference, arg + 11,
 641                                        "refs/heads/", NULL);
 642                                clear_ref_exclusion(&ref_excludes);
 643                                continue;
 644                        }
 645                        if (!strcmp(arg, "--branches")) {
 646                                for_each_branch_ref(show_reference, NULL);
 647                                clear_ref_exclusion(&ref_excludes);
 648                                continue;
 649                        }
 650                        if (!prefixcmp(arg, "--tags=")) {
 651                                for_each_glob_ref_in(show_reference, arg + 7,
 652                                        "refs/tags/", NULL);
 653                                clear_ref_exclusion(&ref_excludes);
 654                                continue;
 655                        }
 656                        if (!strcmp(arg, "--tags")) {
 657                                for_each_tag_ref(show_reference, NULL);
 658                                clear_ref_exclusion(&ref_excludes);
 659                                continue;
 660                        }
 661                        if (!prefixcmp(arg, "--glob=")) {
 662                                for_each_glob_ref(show_reference, arg + 7, NULL);
 663                                clear_ref_exclusion(&ref_excludes);
 664                                continue;
 665                        }
 666                        if (!prefixcmp(arg, "--remotes=")) {
 667                                for_each_glob_ref_in(show_reference, arg + 10,
 668                                        "refs/remotes/", NULL);
 669                                clear_ref_exclusion(&ref_excludes);
 670                                continue;
 671                        }
 672                        if (!strcmp(arg, "--remotes")) {
 673                                for_each_remote_ref(show_reference, NULL);
 674                                clear_ref_exclusion(&ref_excludes);
 675                                continue;
 676                        }
 677                        if (!prefixcmp(arg, "--exclude=")) {
 678                                add_ref_exclusion(&ref_excludes, arg + 10);
 679                                continue;
 680                        }
 681                        if (!strcmp(arg, "--show-toplevel")) {
 682                                const char *work_tree = get_git_work_tree();
 683                                if (work_tree)
 684                                        puts(work_tree);
 685                                continue;
 686                        }
 687                        if (!strcmp(arg, "--show-prefix")) {
 688                                if (prefix)
 689                                        puts(prefix);
 690                                else
 691                                        putchar('\n');
 692                                continue;
 693                        }
 694                        if (!strcmp(arg, "--show-cdup")) {
 695                                const char *pfx = prefix;
 696                                if (!is_inside_work_tree()) {
 697                                        const char *work_tree =
 698                                                get_git_work_tree();
 699                                        if (work_tree)
 700                                                printf("%s\n", work_tree);
 701                                        continue;
 702                                }
 703                                while (pfx) {
 704                                        pfx = strchr(pfx, '/');
 705                                        if (pfx) {
 706                                                pfx++;
 707                                                printf("../");
 708                                        }
 709                                }
 710                                putchar('\n');
 711                                continue;
 712                        }
 713                        if (!strcmp(arg, "--git-dir")) {
 714                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 715                                static char cwd[PATH_MAX];
 716                                int len;
 717                                if (gitdir) {
 718                                        puts(gitdir);
 719                                        continue;
 720                                }
 721                                if (!prefix) {
 722                                        puts(".git");
 723                                        continue;
 724                                }
 725                                if (!getcwd(cwd, PATH_MAX))
 726                                        die_errno("unable to get current working directory");
 727                                len = strlen(cwd);
 728                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 729                                continue;
 730                        }
 731                        if (!strcmp(arg, "--is-inside-git-dir")) {
 732                                printf("%s\n", is_inside_git_dir() ? "true"
 733                                                : "false");
 734                                continue;
 735                        }
 736                        if (!strcmp(arg, "--is-inside-work-tree")) {
 737                                printf("%s\n", is_inside_work_tree() ? "true"
 738                                                : "false");
 739                                continue;
 740                        }
 741                        if (!strcmp(arg, "--is-bare-repository")) {
 742                                printf("%s\n", is_bare_repository() ? "true"
 743                                                : "false");
 744                                continue;
 745                        }
 746                        if (!prefixcmp(arg, "--since=")) {
 747                                show_datestring("--max-age=", arg+8);
 748                                continue;
 749                        }
 750                        if (!prefixcmp(arg, "--after=")) {
 751                                show_datestring("--max-age=", arg+8);
 752                                continue;
 753                        }
 754                        if (!prefixcmp(arg, "--before=")) {
 755                                show_datestring("--min-age=", arg+9);
 756                                continue;
 757                        }
 758                        if (!prefixcmp(arg, "--until=")) {
 759                                show_datestring("--min-age=", arg+8);
 760                                continue;
 761                        }
 762                        if (show_flag(arg) && verify)
 763                                die_no_single_rev(quiet);
 764                        continue;
 765                }
 766
 767                /* Not a flag argument */
 768                if (try_difference(arg))
 769                        continue;
 770                if (try_parent_shorthands(arg))
 771                        continue;
 772                name = arg;
 773                type = NORMAL;
 774                if (*arg == '^') {
 775                        name++;
 776                        type = REVERSED;
 777                }
 778                if (!get_sha1(name, sha1)) {
 779                        if (verify)
 780                                revs_count++;
 781                        else
 782                                show_rev(type, sha1, name);
 783                        continue;
 784                }
 785                if (verify)
 786                        die_no_single_rev(quiet);
 787                as_is = 1;
 788                if (!show_file(arg, output_prefix))
 789                        continue;
 790                verify_filename(prefix, arg, 1);
 791        }
 792        if (verify) {
 793                if (revs_count == 1) {
 794                        show_rev(type, sha1, name);
 795                        return 0;
 796                } else if (revs_count == 0 && show_default())
 797                        return 0;
 798                die_no_single_rev(quiet);
 799        } else
 800                show_default();
 801        return 0;
 802}