Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit merge-file: clamp exit code to maximum 127 (e34f802)
   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 int stuck_long;
  36static struct string_list *ref_excludes;
  37
  38/*
  39 * Some arguments are relevant "revision" arguments,
  40 * others are about output format or other details.
  41 * This sorts it all out.
  42 */
  43static int is_rev_argument(const char *arg)
  44{
  45        static const char *rev_args[] = {
  46                "--all",
  47                "--bisect",
  48                "--dense",
  49                "--branches=",
  50                "--branches",
  51                "--header",
  52                "--ignore-missing",
  53                "--max-age=",
  54                "--max-count=",
  55                "--min-age=",
  56                "--no-merges",
  57                "--min-parents=",
  58                "--no-min-parents",
  59                "--max-parents=",
  60                "--no-max-parents",
  61                "--objects",
  62                "--objects-edge",
  63                "--parents",
  64                "--pretty",
  65                "--remotes=",
  66                "--remotes",
  67                "--glob=",
  68                "--sparse",
  69                "--tags=",
  70                "--tags",
  71                "--topo-order",
  72                "--date-order",
  73                "--unpacked",
  74                NULL
  75        };
  76        const char **p = rev_args;
  77
  78        /* accept -<digit>, like traditional "head" */
  79        if ((*arg == '-') && isdigit(arg[1]))
  80                return 1;
  81
  82        for (;;) {
  83                const char *str = *p++;
  84                int len;
  85                if (!str)
  86                        return 0;
  87                len = strlen(str);
  88                if (!strcmp(arg, str) ||
  89                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  90                        return 1;
  91        }
  92}
  93
  94/* Output argument as a string, either SQ or normal */
  95static void show(const char *arg)
  96{
  97        if (output_sq) {
  98                int sq = '\'', ch;
  99
 100                putchar(sq);
 101                while ((ch = *arg++)) {
 102                        if (ch == sq)
 103                                fputs("'\\'", stdout);
 104                        putchar(ch);
 105                }
 106                putchar(sq);
 107                putchar(' ');
 108        }
 109        else
 110                puts(arg);
 111}
 112
 113/* Like show(), but with a negation prefix according to type */
 114static void show_with_type(int type, const char *arg)
 115{
 116        if (type != show_type)
 117                putchar('^');
 118        show(arg);
 119}
 120
 121/* Output a revision, only if filter allows it */
 122static void show_rev(int type, const unsigned char *sha1, const char *name)
 123{
 124        if (!(filter & DO_REVS))
 125                return;
 126        def = NULL;
 127
 128        if ((symbolic || abbrev_ref) && name) {
 129                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 130                        unsigned char discard[20];
 131                        char *full;
 132
 133                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 134                        case 0:
 135                                /*
 136                                 * Not found -- not a ref.  We could
 137                                 * emit "name" here, but symbolic-full
 138                                 * users are interested in finding the
 139                                 * refs spelled in full, and they would
 140                                 * need to filter non-refs if we did so.
 141                                 */
 142                                break;
 143                        case 1: /* happy */
 144                                if (abbrev_ref)
 145                                        full = shorten_unambiguous_ref(full,
 146                                                abbrev_ref_strict);
 147                                show_with_type(type, full);
 148                                break;
 149                        default: /* ambiguous */
 150                                error("refname '%s' is ambiguous", name);
 151                                break;
 152                        }
 153                } else {
 154                        show_with_type(type, name);
 155                }
 156        }
 157        else if (abbrev)
 158                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 159        else
 160                show_with_type(type, sha1_to_hex(sha1));
 161}
 162
 163/* Output a flag, only if filter allows it. */
 164static int show_flag(const char *arg)
 165{
 166        if (!(filter & DO_FLAGS))
 167                return 0;
 168        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 169                show(arg);
 170                return 1;
 171        }
 172        return 0;
 173}
 174
 175static int show_default(void)
 176{
 177        const char *s = def;
 178
 179        if (s) {
 180                unsigned char sha1[20];
 181
 182                def = NULL;
 183                if (!get_sha1(s, sha1)) {
 184                        show_rev(NORMAL, sha1, s);
 185                        return 1;
 186                }
 187        }
 188        return 0;
 189}
 190
 191static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 192{
 193        if (ref_excluded(ref_excludes, refname))
 194                return 0;
 195        show_rev(NORMAL, sha1, refname);
 196        return 0;
 197}
 198
 199static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 200{
 201        show_rev(REVERSED, sha1, refname);
 202        return 0;
 203}
 204
 205static int show_abbrev(const unsigned char *sha1, void *cb_data)
 206{
 207        show_rev(NORMAL, sha1, NULL);
 208        return 0;
 209}
 210
 211static void show_datestring(const char *flag, const char *datestr)
 212{
 213        static char buffer[100];
 214
 215        /* date handling requires both flags and revs */
 216        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 217                return;
 218        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 219        show(buffer);
 220}
 221
 222static int show_file(const char *arg, int output_prefix)
 223{
 224        show_default();
 225        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 226                if (output_prefix) {
 227                        const char *prefix = startup_info->prefix;
 228                        show(prefix_filename(prefix,
 229                                             prefix ? strlen(prefix) : 0,
 230                                             arg));
 231                } else
 232                        show(arg);
 233                return 1;
 234        }
 235        return 0;
 236}
 237
 238static int try_difference(const char *arg)
 239{
 240        char *dotdot;
 241        unsigned char sha1[20];
 242        unsigned char end[20];
 243        const char *next;
 244        const char *this;
 245        int symmetric;
 246        static const char head_by_default[] = "HEAD";
 247
 248        if (!(dotdot = strstr(arg, "..")))
 249                return 0;
 250        next = dotdot + 2;
 251        this = arg;
 252        symmetric = (*next == '.');
 253
 254        *dotdot = 0;
 255        next += symmetric;
 256
 257        if (!*next)
 258                next = head_by_default;
 259        if (dotdot == arg)
 260                this = head_by_default;
 261
 262        if (this == head_by_default && next == head_by_default &&
 263            !symmetric) {
 264                /*
 265                 * Just ".."?  That is not a range but the
 266                 * pathspec for the parent directory.
 267                 */
 268                *dotdot = '.';
 269                return 0;
 270        }
 271
 272        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 273                show_rev(NORMAL, end, next);
 274                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 275                if (symmetric) {
 276                        struct commit_list *exclude;
 277                        struct commit *a, *b;
 278                        a = lookup_commit_reference(sha1);
 279                        b = lookup_commit_reference(end);
 280                        exclude = get_merge_bases(a, b, 1);
 281                        while (exclude) {
 282                                struct commit_list *n = exclude->next;
 283                                show_rev(REVERSED,
 284                                         exclude->item->object.sha1,NULL);
 285                                free(exclude);
 286                                exclude = n;
 287                        }
 288                }
 289                *dotdot = '.';
 290                return 1;
 291        }
 292        *dotdot = '.';
 293        return 0;
 294}
 295
 296static int try_parent_shorthands(const char *arg)
 297{
 298        char *dotdot;
 299        unsigned char sha1[20];
 300        struct commit *commit;
 301        struct commit_list *parents;
 302        int parents_only;
 303
 304        if ((dotdot = strstr(arg, "^!")))
 305                parents_only = 0;
 306        else if ((dotdot = strstr(arg, "^@")))
 307                parents_only = 1;
 308
 309        if (!dotdot || dotdot[2])
 310                return 0;
 311
 312        *dotdot = 0;
 313        if (get_sha1_committish(arg, sha1)) {
 314                *dotdot = '^';
 315                return 0;
 316        }
 317
 318        if (!parents_only)
 319                show_rev(NORMAL, sha1, arg);
 320        commit = lookup_commit_reference(sha1);
 321        for (parents = commit->parents; parents; parents = parents->next)
 322                show_rev(parents_only ? NORMAL : REVERSED,
 323                                parents->item->object.sha1, arg);
 324
 325        *dotdot = '^';
 326        return 1;
 327}
 328
 329static int parseopt_dump(const struct option *o, const char *arg, int unset)
 330{
 331        struct strbuf *parsed = o->value;
 332        if (unset)
 333                strbuf_addf(parsed, " --no-%s", o->long_name);
 334        else if (o->short_name && (o->long_name == NULL || !stuck_long))
 335                strbuf_addf(parsed, " -%c", o->short_name);
 336        else
 337                strbuf_addf(parsed, " --%s", o->long_name);
 338        if (arg) {
 339                if (!stuck_long)
 340                        strbuf_addch(parsed, ' ');
 341                else if (o->long_name)
 342                        strbuf_addch(parsed, '=');
 343                sq_quote_buf(parsed, arg);
 344        }
 345        return 0;
 346}
 347
 348static const char *skipspaces(const char *s)
 349{
 350        while (isspace(*s))
 351                s++;
 352        return s;
 353}
 354
 355static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 356{
 357        static int keep_dashdash = 0, stop_at_non_option = 0;
 358        static char const * const parseopt_usage[] = {
 359                N_("git rev-parse --parseopt [options] -- [<args>...]"),
 360                NULL
 361        };
 362        static struct option parseopt_opts[] = {
 363                OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 364                                        N_("keep the `--` passed as an arg")),
 365                OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 366                                        N_("stop parsing after the "
 367                                           "first non-option argument")),
 368                OPT_BOOL(0, "stuck-long", &stuck_long,
 369                                        N_("output in stuck long form")),
 370                OPT_END(),
 371        };
 372
 373        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 374        const char **usage = NULL;
 375        struct option *opts = NULL;
 376        int onb = 0, osz = 0, unb = 0, usz = 0;
 377
 378        strbuf_addstr(&parsed, "set --");
 379        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 380                             PARSE_OPT_KEEP_DASHDASH);
 381        if (argc < 1 || strcmp(argv[0], "--"))
 382                usage_with_options(parseopt_usage, parseopt_opts);
 383
 384        /* get the usage up to the first line with a -- on it */
 385        for (;;) {
 386                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 387                        die("premature end of input");
 388                ALLOC_GROW(usage, unb + 1, usz);
 389                if (!strcmp("--", sb.buf)) {
 390                        if (unb < 1)
 391                                die("no usage string given before the `--' separator");
 392                        usage[unb] = NULL;
 393                        break;
 394                }
 395                usage[unb++] = strbuf_detach(&sb, NULL);
 396        }
 397
 398        /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 399        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 400                const char *s;
 401                const char *end;
 402                struct option *o;
 403
 404                if (!sb.len)
 405                        continue;
 406
 407                ALLOC_GROW(opts, onb + 1, osz);
 408                memset(opts + onb, 0, sizeof(opts[onb]));
 409
 410                o = &opts[onb++];
 411                s = strchr(sb.buf, ' ');
 412                if (!s || *sb.buf == ' ') {
 413                        o->type = OPTION_GROUP;
 414                        o->help = xstrdup(skipspaces(sb.buf));
 415                        continue;
 416                }
 417
 418                o->type = OPTION_CALLBACK;
 419                o->help = xstrdup(skipspaces(s));
 420                o->value = &parsed;
 421                o->flags = PARSE_OPT_NOARG;
 422                o->callback = &parseopt_dump;
 423
 424                /* Possible argument name hint */
 425                end = s;
 426                while (s > sb.buf && strchr("*=?!", s[-1]) == NULL)
 427                        --s;
 428                if (s != sb.buf && s != end)
 429                        o->argh = xmemdupz(s, end - s);
 430                if (s == sb.buf)
 431                        s = end;
 432
 433                while (s > sb.buf && strchr("*=?!", s[-1])) {
 434                        switch (*--s) {
 435                        case '=':
 436                                o->flags &= ~PARSE_OPT_NOARG;
 437                                break;
 438                        case '?':
 439                                o->flags &= ~PARSE_OPT_NOARG;
 440                                o->flags |= PARSE_OPT_OPTARG;
 441                                break;
 442                        case '!':
 443                                o->flags |= PARSE_OPT_NONEG;
 444                                break;
 445                        case '*':
 446                                o->flags |= PARSE_OPT_HIDDEN;
 447                                break;
 448                        }
 449                }
 450
 451                if (s - sb.buf == 1) /* short option only */
 452                        o->short_name = *sb.buf;
 453                else if (sb.buf[1] != ',') /* long option only */
 454                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 455                else {
 456                        o->short_name = *sb.buf;
 457                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 458                }
 459        }
 460        strbuf_release(&sb);
 461
 462        /* put an OPT_END() */
 463        ALLOC_GROW(opts, onb + 1, osz);
 464        memset(opts + onb, 0, sizeof(opts[onb]));
 465        argc = parse_options(argc, argv, prefix, opts, usage,
 466                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 467                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 468                        PARSE_OPT_SHELL_EVAL);
 469
 470        strbuf_addf(&parsed, " --");
 471        sq_quote_argv(&parsed, argv, 0);
 472        puts(parsed.buf);
 473        return 0;
 474}
 475
 476static int cmd_sq_quote(int argc, const char **argv)
 477{
 478        struct strbuf buf = STRBUF_INIT;
 479
 480        if (argc)
 481                sq_quote_argv(&buf, argv, 0);
 482        printf("%s\n", buf.buf);
 483        strbuf_release(&buf);
 484
 485        return 0;
 486}
 487
 488static void die_no_single_rev(int quiet)
 489{
 490        if (quiet)
 491                exit(1);
 492        else
 493                die("Needed a single revision");
 494}
 495
 496static const char builtin_rev_parse_usage[] =
 497N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 498   "   or: git rev-parse --sq-quote [<arg>...]\n"
 499   "   or: git rev-parse [options] [<arg>...]\n"
 500   "\n"
 501   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 502
 503int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 504{
 505        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 506        int has_dashdash = 0;
 507        int output_prefix = 0;
 508        unsigned char sha1[20];
 509        const char *name = NULL;
 510
 511        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 512                return cmd_parseopt(argc - 1, argv + 1, prefix);
 513
 514        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 515                return cmd_sq_quote(argc - 2, argv + 2);
 516
 517        if (argc > 1 && !strcmp("-h", argv[1]))
 518                usage(builtin_rev_parse_usage);
 519
 520        for (i = 1; i < argc; i++) {
 521                if (!strcmp(argv[i], "--")) {
 522                        has_dashdash = 1;
 523                        break;
 524                }
 525        }
 526
 527        prefix = setup_git_directory();
 528        git_config(git_default_config, NULL);
 529        for (i = 1; i < argc; i++) {
 530                const char *arg = argv[i];
 531
 532                if (as_is) {
 533                        if (show_file(arg, output_prefix) && as_is < 2)
 534                                verify_filename(prefix, arg, 0);
 535                        continue;
 536                }
 537                if (!strcmp(arg,"-n")) {
 538                        if (++i >= argc)
 539                                die("-n requires an argument");
 540                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 541                                show(arg);
 542                                show(argv[i]);
 543                        }
 544                        continue;
 545                }
 546                if (starts_with(arg, "-n")) {
 547                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 548                                show(arg);
 549                        continue;
 550                }
 551
 552                if (*arg == '-') {
 553                        if (!strcmp(arg, "--")) {
 554                                as_is = 2;
 555                                /* Pass on the "--" if we show anything but files.. */
 556                                if (filter & (DO_FLAGS | DO_REVS))
 557                                        show_file(arg, 0);
 558                                continue;
 559                        }
 560                        if (!strcmp(arg, "--default")) {
 561                                def = argv[++i];
 562                                if (!def)
 563                                        die("--default requires an argument");
 564                                continue;
 565                        }
 566                        if (!strcmp(arg, "--prefix")) {
 567                                prefix = argv[++i];
 568                                if (!prefix)
 569                                        die("--prefix requires an argument");
 570                                startup_info->prefix = prefix;
 571                                output_prefix = 1;
 572                                continue;
 573                        }
 574                        if (!strcmp(arg, "--revs-only")) {
 575                                filter &= ~DO_NOREV;
 576                                continue;
 577                        }
 578                        if (!strcmp(arg, "--no-revs")) {
 579                                filter &= ~DO_REVS;
 580                                continue;
 581                        }
 582                        if (!strcmp(arg, "--flags")) {
 583                                filter &= ~DO_NONFLAGS;
 584                                continue;
 585                        }
 586                        if (!strcmp(arg, "--no-flags")) {
 587                                filter &= ~DO_FLAGS;
 588                                continue;
 589                        }
 590                        if (!strcmp(arg, "--verify")) {
 591                                filter &= ~(DO_FLAGS|DO_NOREV);
 592                                verify = 1;
 593                                continue;
 594                        }
 595                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 596                                quiet = 1;
 597                                continue;
 598                        }
 599                        if (!strcmp(arg, "--short") ||
 600                            starts_with(arg, "--short=")) {
 601                                filter &= ~(DO_FLAGS|DO_NOREV);
 602                                verify = 1;
 603                                abbrev = DEFAULT_ABBREV;
 604                                if (arg[7] == '=')
 605                                        abbrev = strtoul(arg + 8, NULL, 10);
 606                                if (abbrev < MINIMUM_ABBREV)
 607                                        abbrev = MINIMUM_ABBREV;
 608                                else if (40 <= abbrev)
 609                                        abbrev = 40;
 610                                continue;
 611                        }
 612                        if (!strcmp(arg, "--sq")) {
 613                                output_sq = 1;
 614                                continue;
 615                        }
 616                        if (!strcmp(arg, "--not")) {
 617                                show_type ^= REVERSED;
 618                                continue;
 619                        }
 620                        if (!strcmp(arg, "--symbolic")) {
 621                                symbolic = SHOW_SYMBOLIC_ASIS;
 622                                continue;
 623                        }
 624                        if (!strcmp(arg, "--symbolic-full-name")) {
 625                                symbolic = SHOW_SYMBOLIC_FULL;
 626                                continue;
 627                        }
 628                        if (starts_with(arg, "--abbrev-ref") &&
 629                            (!arg[12] || arg[12] == '=')) {
 630                                abbrev_ref = 1;
 631                                abbrev_ref_strict = warn_ambiguous_refs;
 632                                if (arg[12] == '=') {
 633                                        if (!strcmp(arg + 13, "strict"))
 634                                                abbrev_ref_strict = 1;
 635                                        else if (!strcmp(arg + 13, "loose"))
 636                                                abbrev_ref_strict = 0;
 637                                        else
 638                                                die("unknown mode for %s", arg);
 639                                }
 640                                continue;
 641                        }
 642                        if (!strcmp(arg, "--all")) {
 643                                for_each_ref(show_reference, NULL);
 644                                continue;
 645                        }
 646                        if (starts_with(arg, "--disambiguate=")) {
 647                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 648                                continue;
 649                        }
 650                        if (!strcmp(arg, "--bisect")) {
 651                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 652                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 653                                continue;
 654                        }
 655                        if (starts_with(arg, "--branches=")) {
 656                                for_each_glob_ref_in(show_reference, arg + 11,
 657                                        "refs/heads/", NULL);
 658                                clear_ref_exclusion(&ref_excludes);
 659                                continue;
 660                        }
 661                        if (!strcmp(arg, "--branches")) {
 662                                for_each_branch_ref(show_reference, NULL);
 663                                clear_ref_exclusion(&ref_excludes);
 664                                continue;
 665                        }
 666                        if (starts_with(arg, "--tags=")) {
 667                                for_each_glob_ref_in(show_reference, arg + 7,
 668                                        "refs/tags/", NULL);
 669                                clear_ref_exclusion(&ref_excludes);
 670                                continue;
 671                        }
 672                        if (!strcmp(arg, "--tags")) {
 673                                for_each_tag_ref(show_reference, NULL);
 674                                clear_ref_exclusion(&ref_excludes);
 675                                continue;
 676                        }
 677                        if (starts_with(arg, "--glob=")) {
 678                                for_each_glob_ref(show_reference, arg + 7, NULL);
 679                                clear_ref_exclusion(&ref_excludes);
 680                                continue;
 681                        }
 682                        if (starts_with(arg, "--remotes=")) {
 683                                for_each_glob_ref_in(show_reference, arg + 10,
 684                                        "refs/remotes/", NULL);
 685                                clear_ref_exclusion(&ref_excludes);
 686                                continue;
 687                        }
 688                        if (!strcmp(arg, "--remotes")) {
 689                                for_each_remote_ref(show_reference, NULL);
 690                                clear_ref_exclusion(&ref_excludes);
 691                                continue;
 692                        }
 693                        if (starts_with(arg, "--exclude=")) {
 694                                add_ref_exclusion(&ref_excludes, arg + 10);
 695                                continue;
 696                        }
 697                        if (!strcmp(arg, "--local-env-vars")) {
 698                                int i;
 699                                for (i = 0; local_repo_env[i]; i++)
 700                                        printf("%s\n", local_repo_env[i]);
 701                                continue;
 702                        }
 703                        if (!strcmp(arg, "--show-toplevel")) {
 704                                const char *work_tree = get_git_work_tree();
 705                                if (work_tree)
 706                                        puts(work_tree);
 707                                continue;
 708                        }
 709                        if (!strcmp(arg, "--show-prefix")) {
 710                                if (prefix)
 711                                        puts(prefix);
 712                                else
 713                                        putchar('\n');
 714                                continue;
 715                        }
 716                        if (!strcmp(arg, "--show-cdup")) {
 717                                const char *pfx = prefix;
 718                                if (!is_inside_work_tree()) {
 719                                        const char *work_tree =
 720                                                get_git_work_tree();
 721                                        if (work_tree)
 722                                                printf("%s\n", work_tree);
 723                                        continue;
 724                                }
 725                                while (pfx) {
 726                                        pfx = strchr(pfx, '/');
 727                                        if (pfx) {
 728                                                pfx++;
 729                                                printf("../");
 730                                        }
 731                                }
 732                                putchar('\n');
 733                                continue;
 734                        }
 735                        if (!strcmp(arg, "--git-dir")) {
 736                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 737                                static char cwd[PATH_MAX];
 738                                int len;
 739                                if (gitdir) {
 740                                        puts(gitdir);
 741                                        continue;
 742                                }
 743                                if (!prefix) {
 744                                        puts(".git");
 745                                        continue;
 746                                }
 747                                if (!getcwd(cwd, PATH_MAX))
 748                                        die_errno("unable to get current working directory");
 749                                len = strlen(cwd);
 750                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 751                                continue;
 752                        }
 753                        if (!strcmp(arg, "--resolve-git-dir")) {
 754                                const char *gitdir = argv[++i];
 755                                if (!gitdir)
 756                                        die("--resolve-git-dir requires an argument");
 757                                gitdir = resolve_gitdir(gitdir);
 758                                if (!gitdir)
 759                                        die("not a gitdir '%s'", argv[i]);
 760                                puts(gitdir);
 761                                continue;
 762                        }
 763                        if (!strcmp(arg, "--is-inside-git-dir")) {
 764                                printf("%s\n", is_inside_git_dir() ? "true"
 765                                                : "false");
 766                                continue;
 767                        }
 768                        if (!strcmp(arg, "--is-inside-work-tree")) {
 769                                printf("%s\n", is_inside_work_tree() ? "true"
 770                                                : "false");
 771                                continue;
 772                        }
 773                        if (!strcmp(arg, "--is-bare-repository")) {
 774                                printf("%s\n", is_bare_repository() ? "true"
 775                                                : "false");
 776                                continue;
 777                        }
 778                        if (starts_with(arg, "--since=")) {
 779                                show_datestring("--max-age=", arg+8);
 780                                continue;
 781                        }
 782                        if (starts_with(arg, "--after=")) {
 783                                show_datestring("--max-age=", arg+8);
 784                                continue;
 785                        }
 786                        if (starts_with(arg, "--before=")) {
 787                                show_datestring("--min-age=", arg+9);
 788                                continue;
 789                        }
 790                        if (starts_with(arg, "--until=")) {
 791                                show_datestring("--min-age=", arg+8);
 792                                continue;
 793                        }
 794                        if (show_flag(arg) && verify)
 795                                die_no_single_rev(quiet);
 796                        continue;
 797                }
 798
 799                /* Not a flag argument */
 800                if (try_difference(arg))
 801                        continue;
 802                if (try_parent_shorthands(arg))
 803                        continue;
 804                name = arg;
 805                type = NORMAL;
 806                if (*arg == '^') {
 807                        name++;
 808                        type = REVERSED;
 809                }
 810                if (!get_sha1(name, sha1)) {
 811                        if (verify)
 812                                revs_count++;
 813                        else
 814                                show_rev(type, sha1, name);
 815                        continue;
 816                }
 817                if (verify)
 818                        die_no_single_rev(quiet);
 819                if (has_dashdash)
 820                        die("bad revision '%s'", arg);
 821                as_is = 1;
 822                if (!show_file(arg, output_prefix))
 823                        continue;
 824                verify_filename(prefix, arg, 1);
 825        }
 826        if (verify) {
 827                if (revs_count == 1) {
 828                        show_rev(type, sha1, name);
 829                        return 0;
 830                } else if (revs_count == 0 && show_default())
 831                        return 0;
 832                die_no_single_rev(quiet);
 833        } else
 834                show_default();
 835        return 0;
 836}