Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit bundle: dup() output descriptor closer to point-of-use (2c8ee1f)
   1/*
   2 * rev-parse.c
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "config.h"
   8#include "commit.h"
   9#include "refs.h"
  10#include "quote.h"
  11#include "builtin.h"
  12#include "parse-options.h"
  13#include "diff.h"
  14#include "revision.h"
  15#include "split-index.h"
  16#include "submodule.h"
  17
  18#define DO_REVS         1
  19#define DO_NOREV        2
  20#define DO_FLAGS        4
  21#define DO_NONFLAGS     8
  22static int filter = ~0;
  23
  24static const char *def;
  25
  26#define NORMAL 0
  27#define REVERSED 1
  28static int show_type = NORMAL;
  29
  30#define SHOW_SYMBOLIC_ASIS 1
  31#define SHOW_SYMBOLIC_FULL 2
  32static int symbolic;
  33static int abbrev;
  34static int abbrev_ref;
  35static int abbrev_ref_strict;
  36static int output_sq;
  37
  38static int stuck_long;
  39static struct string_list *ref_excludes;
  40
  41/*
  42 * Some arguments are relevant "revision" arguments,
  43 * others are about output format or other details.
  44 * This sorts it all out.
  45 */
  46static int is_rev_argument(const char *arg)
  47{
  48        static const char *rev_args[] = {
  49                "--all",
  50                "--bisect",
  51                "--dense",
  52                "--branches=",
  53                "--branches",
  54                "--header",
  55                "--ignore-missing",
  56                "--max-age=",
  57                "--max-count=",
  58                "--min-age=",
  59                "--no-merges",
  60                "--min-parents=",
  61                "--no-min-parents",
  62                "--max-parents=",
  63                "--no-max-parents",
  64                "--objects",
  65                "--objects-edge",
  66                "--parents",
  67                "--pretty",
  68                "--remotes=",
  69                "--remotes",
  70                "--glob=",
  71                "--sparse",
  72                "--tags=",
  73                "--tags",
  74                "--topo-order",
  75                "--date-order",
  76                "--unpacked",
  77                NULL
  78        };
  79        const char **p = rev_args;
  80
  81        /* accept -<digit>, like traditional "head" */
  82        if ((*arg == '-') && isdigit(arg[1]))
  83                return 1;
  84
  85        for (;;) {
  86                const char *str = *p++;
  87                int len;
  88                if (!str)
  89                        return 0;
  90                len = strlen(str);
  91                if (!strcmp(arg, str) ||
  92                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  93                        return 1;
  94        }
  95}
  96
  97/* Output argument as a string, either SQ or normal */
  98static void show(const char *arg)
  99{
 100        if (output_sq) {
 101                int sq = '\'', ch;
 102
 103                putchar(sq);
 104                while ((ch = *arg++)) {
 105                        if (ch == sq)
 106                                fputs("'\\'", stdout);
 107                        putchar(ch);
 108                }
 109                putchar(sq);
 110                putchar(' ');
 111        }
 112        else
 113                puts(arg);
 114}
 115
 116/* Like show(), but with a negation prefix according to type */
 117static void show_with_type(int type, const char *arg)
 118{
 119        if (type != show_type)
 120                putchar('^');
 121        show(arg);
 122}
 123
 124/* Output a revision, only if filter allows it */
 125static void show_rev(int type, const struct object_id *oid, const char *name)
 126{
 127        if (!(filter & DO_REVS))
 128                return;
 129        def = NULL;
 130
 131        if ((symbolic || abbrev_ref) && name) {
 132                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 133                        struct object_id discard;
 134                        char *full;
 135
 136                        switch (dwim_ref(name, strlen(name), &discard, &full)) {
 137                        case 0:
 138                                /*
 139                                 * Not found -- not a ref.  We could
 140                                 * emit "name" here, but symbolic-full
 141                                 * users are interested in finding the
 142                                 * refs spelled in full, and they would
 143                                 * need to filter non-refs if we did so.
 144                                 */
 145                                break;
 146                        case 1: /* happy */
 147                                if (abbrev_ref)
 148                                        full = shorten_unambiguous_ref(full,
 149                                                abbrev_ref_strict);
 150                                show_with_type(type, full);
 151                                break;
 152                        default: /* ambiguous */
 153                                error("refname '%s' is ambiguous", name);
 154                                break;
 155                        }
 156                        free(full);
 157                } else {
 158                        show_with_type(type, name);
 159                }
 160        }
 161        else if (abbrev)
 162                show_with_type(type, find_unique_abbrev(oid, abbrev));
 163        else
 164                show_with_type(type, oid_to_hex(oid));
 165}
 166
 167/* Output a flag, only if filter allows it. */
 168static int show_flag(const char *arg)
 169{
 170        if (!(filter & DO_FLAGS))
 171                return 0;
 172        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 173                show(arg);
 174                return 1;
 175        }
 176        return 0;
 177}
 178
 179static int show_default(void)
 180{
 181        const char *s = def;
 182
 183        if (s) {
 184                struct object_id oid;
 185
 186                def = NULL;
 187                if (!get_oid(s, &oid)) {
 188                        show_rev(NORMAL, &oid, s);
 189                        return 1;
 190                }
 191        }
 192        return 0;
 193}
 194
 195static int show_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 196{
 197        if (ref_excluded(ref_excludes, refname))
 198                return 0;
 199        show_rev(NORMAL, oid, refname);
 200        return 0;
 201}
 202
 203static int anti_reference(const char *refname, const struct object_id *oid, int flag, void *cb_data)
 204{
 205        show_rev(REVERSED, oid, refname);
 206        return 0;
 207}
 208
 209static int show_abbrev(const struct object_id *oid, void *cb_data)
 210{
 211        show_rev(NORMAL, oid, NULL);
 212        return 0;
 213}
 214
 215static void show_datestring(const char *flag, const char *datestr)
 216{
 217        char *buffer;
 218
 219        /* date handling requires both flags and revs */
 220        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 221                return;
 222        buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
 223        show(buffer);
 224        free(buffer);
 225}
 226
 227static int show_file(const char *arg, int output_prefix)
 228{
 229        show_default();
 230        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 231                if (output_prefix) {
 232                        const char *prefix = startup_info->prefix;
 233                        char *fname = prefix_filename(prefix, arg);
 234                        show(fname);
 235                        free(fname);
 236                } else
 237                        show(arg);
 238                return 1;
 239        }
 240        return 0;
 241}
 242
 243static int try_difference(const char *arg)
 244{
 245        char *dotdot;
 246        struct object_id start_oid;
 247        struct object_id end_oid;
 248        const char *end;
 249        const char *start;
 250        int symmetric;
 251        static const char head_by_default[] = "HEAD";
 252
 253        if (!(dotdot = strstr(arg, "..")))
 254                return 0;
 255        end = dotdot + 2;
 256        start = arg;
 257        symmetric = (*end == '.');
 258
 259        *dotdot = 0;
 260        end += symmetric;
 261
 262        if (!*end)
 263                end = head_by_default;
 264        if (dotdot == arg)
 265                start = head_by_default;
 266
 267        if (start == head_by_default && end == head_by_default &&
 268            !symmetric) {
 269                /*
 270                 * Just ".."?  That is not a range but the
 271                 * pathspec for the parent directory.
 272                 */
 273                *dotdot = '.';
 274                return 0;
 275        }
 276
 277        if (!get_oid_committish(start, &start_oid) && !get_oid_committish(end, &end_oid)) {
 278                show_rev(NORMAL, &end_oid, end);
 279                show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
 280                if (symmetric) {
 281                        struct commit_list *exclude;
 282                        struct commit *a, *b;
 283                        a = lookup_commit_reference(the_repository, &start_oid);
 284                        b = lookup_commit_reference(the_repository, &end_oid);
 285                        if (!a || !b) {
 286                                *dotdot = '.';
 287                                return 0;
 288                        }
 289                        exclude = get_merge_bases(a, b);
 290                        while (exclude) {
 291                                struct commit *commit = pop_commit(&exclude);
 292                                show_rev(REVERSED, &commit->object.oid, NULL);
 293                        }
 294                }
 295                *dotdot = '.';
 296                return 1;
 297        }
 298        *dotdot = '.';
 299        return 0;
 300}
 301
 302static int try_parent_shorthands(const char *arg)
 303{
 304        char *dotdot;
 305        struct object_id oid;
 306        struct commit *commit;
 307        struct commit_list *parents;
 308        int parent_number;
 309        int include_rev = 0;
 310        int include_parents = 0;
 311        int exclude_parent = 0;
 312
 313        if ((dotdot = strstr(arg, "^!"))) {
 314                include_rev = 1;
 315                if (dotdot[2])
 316                        return 0;
 317        } else if ((dotdot = strstr(arg, "^@"))) {
 318                include_parents = 1;
 319                if (dotdot[2])
 320                        return 0;
 321        } else if ((dotdot = strstr(arg, "^-"))) {
 322                include_rev = 1;
 323                exclude_parent = 1;
 324
 325                if (dotdot[2]) {
 326                        char *end;
 327                        exclude_parent = strtoul(dotdot + 2, &end, 10);
 328                        if (*end != '\0' || !exclude_parent)
 329                                return 0;
 330                }
 331        } else
 332                return 0;
 333
 334        *dotdot = 0;
 335        if (get_oid_committish(arg, &oid) ||
 336            !(commit = lookup_commit_reference(the_repository, &oid))) {
 337                *dotdot = '^';
 338                return 0;
 339        }
 340
 341        if (exclude_parent &&
 342            exclude_parent > commit_list_count(commit->parents)) {
 343                *dotdot = '^';
 344                return 0;
 345        }
 346
 347        if (include_rev)
 348                show_rev(NORMAL, &oid, arg);
 349        for (parents = commit->parents, parent_number = 1;
 350             parents;
 351             parents = parents->next, parent_number++) {
 352                char *name = NULL;
 353
 354                if (exclude_parent && parent_number != exclude_parent)
 355                        continue;
 356
 357                if (symbolic)
 358                        name = xstrfmt("%s^%d", arg, parent_number);
 359                show_rev(include_parents ? NORMAL : REVERSED,
 360                         &parents->item->object.oid, name);
 361                free(name);
 362        }
 363
 364        *dotdot = '^';
 365        return 1;
 366}
 367
 368static int parseopt_dump(const struct option *o, const char *arg, int unset)
 369{
 370        struct strbuf *parsed = o->value;
 371        if (unset)
 372                strbuf_addf(parsed, " --no-%s", o->long_name);
 373        else if (o->short_name && (o->long_name == NULL || !stuck_long))
 374                strbuf_addf(parsed, " -%c", o->short_name);
 375        else
 376                strbuf_addf(parsed, " --%s", o->long_name);
 377        if (arg) {
 378                if (!stuck_long)
 379                        strbuf_addch(parsed, ' ');
 380                else if (o->long_name)
 381                        strbuf_addch(parsed, '=');
 382                sq_quote_buf(parsed, arg);
 383        }
 384        return 0;
 385}
 386
 387static const char *skipspaces(const char *s)
 388{
 389        while (isspace(*s))
 390                s++;
 391        return s;
 392}
 393
 394static char *findspace(const char *s)
 395{
 396        for (; *s; s++)
 397                if (isspace(*s))
 398                        return (char*)s;
 399        return NULL;
 400}
 401
 402static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 403{
 404        static int keep_dashdash = 0, stop_at_non_option = 0;
 405        static char const * const parseopt_usage[] = {
 406                N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 407                NULL
 408        };
 409        static struct option parseopt_opts[] = {
 410                OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 411                                        N_("keep the `--` passed as an arg")),
 412                OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 413                                        N_("stop parsing after the "
 414                                           "first non-option argument")),
 415                OPT_BOOL(0, "stuck-long", &stuck_long,
 416                                        N_("output in stuck long form")),
 417                OPT_END(),
 418        };
 419        static const char * const flag_chars = "*=?!";
 420
 421        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 422        const char **usage = NULL;
 423        struct option *opts = NULL;
 424        int onb = 0, osz = 0, unb = 0, usz = 0;
 425
 426        strbuf_addstr(&parsed, "set --");
 427        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 428                             PARSE_OPT_KEEP_DASHDASH);
 429        if (argc < 1 || strcmp(argv[0], "--"))
 430                usage_with_options(parseopt_usage, parseopt_opts);
 431
 432        /* get the usage up to the first line with a -- on it */
 433        for (;;) {
 434                if (strbuf_getline(&sb, stdin) == EOF)
 435                        die("premature end of input");
 436                ALLOC_GROW(usage, unb + 1, usz);
 437                if (!strcmp("--", sb.buf)) {
 438                        if (unb < 1)
 439                                die("no usage string given before the `--' separator");
 440                        usage[unb] = NULL;
 441                        break;
 442                }
 443                usage[unb++] = strbuf_detach(&sb, NULL);
 444        }
 445
 446        /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 447        while (strbuf_getline(&sb, stdin) != EOF) {
 448                const char *s;
 449                char *help;
 450                struct option *o;
 451
 452                if (!sb.len)
 453                        continue;
 454
 455                ALLOC_GROW(opts, onb + 1, osz);
 456                memset(opts + onb, 0, sizeof(opts[onb]));
 457
 458                o = &opts[onb++];
 459                help = findspace(sb.buf);
 460                if (!help || sb.buf == help) {
 461                        o->type = OPTION_GROUP;
 462                        o->help = xstrdup(skipspaces(sb.buf));
 463                        continue;
 464                }
 465
 466                *help = '\0';
 467
 468                o->type = OPTION_CALLBACK;
 469                o->help = xstrdup(skipspaces(help+1));
 470                o->value = &parsed;
 471                o->flags = PARSE_OPT_NOARG;
 472                o->callback = &parseopt_dump;
 473
 474                /* name(s) */
 475                s = strpbrk(sb.buf, flag_chars);
 476                if (s == NULL)
 477                        s = help;
 478
 479                if (s - sb.buf == 1) /* short option only */
 480                        o->short_name = *sb.buf;
 481                else if (sb.buf[1] != ',') /* long option only */
 482                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 483                else {
 484                        o->short_name = *sb.buf;
 485                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 486                }
 487
 488                /* flags */
 489                while (s < help) {
 490                        switch (*s++) {
 491                        case '=':
 492                                o->flags &= ~PARSE_OPT_NOARG;
 493                                continue;
 494                        case '?':
 495                                o->flags &= ~PARSE_OPT_NOARG;
 496                                o->flags |= PARSE_OPT_OPTARG;
 497                                continue;
 498                        case '!':
 499                                o->flags |= PARSE_OPT_NONEG;
 500                                continue;
 501                        case '*':
 502                                o->flags |= PARSE_OPT_HIDDEN;
 503                                continue;
 504                        }
 505                        s--;
 506                        break;
 507                }
 508
 509                if (s < help)
 510                        o->argh = xmemdupz(s, help - s);
 511        }
 512        strbuf_release(&sb);
 513
 514        /* put an OPT_END() */
 515        ALLOC_GROW(opts, onb + 1, osz);
 516        memset(opts + onb, 0, sizeof(opts[onb]));
 517        argc = parse_options(argc, argv, prefix, opts, usage,
 518                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 519                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 520                        PARSE_OPT_SHELL_EVAL);
 521
 522        strbuf_addstr(&parsed, " --");
 523        sq_quote_argv(&parsed, argv);
 524        puts(parsed.buf);
 525        return 0;
 526}
 527
 528static int cmd_sq_quote(int argc, const char **argv)
 529{
 530        struct strbuf buf = STRBUF_INIT;
 531
 532        if (argc)
 533                sq_quote_argv(&buf, argv);
 534        printf("%s\n", buf.buf);
 535        strbuf_release(&buf);
 536
 537        return 0;
 538}
 539
 540static void die_no_single_rev(int quiet)
 541{
 542        if (quiet)
 543                exit(1);
 544        else
 545                die("Needed a single revision");
 546}
 547
 548static const char builtin_rev_parse_usage[] =
 549N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 550   "   or: git rev-parse --sq-quote [<arg>...]\n"
 551   "   or: git rev-parse [<options>] [<arg>...]\n"
 552   "\n"
 553   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 554
 555/*
 556 * Parse "opt" or "opt=<value>", setting value respectively to either
 557 * NULL or the string after "=".
 558 */
 559static int opt_with_value(const char *arg, const char *opt, const char **value)
 560{
 561        if (skip_prefix(arg, opt, &arg)) {
 562                if (!*arg) {
 563                        *value = NULL;
 564                        return 1;
 565                }
 566                if (*arg++ == '=') {
 567                        *value = arg;
 568                        return 1;
 569                }
 570        }
 571        return 0;
 572}
 573
 574static void handle_ref_opt(const char *pattern, const char *prefix)
 575{
 576        if (pattern)
 577                for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 578        else
 579                for_each_ref_in(prefix, show_reference, NULL);
 580        clear_ref_exclusion(&ref_excludes);
 581}
 582
 583int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 584{
 585        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 586        int did_repo_setup = 0;
 587        int has_dashdash = 0;
 588        int output_prefix = 0;
 589        struct object_id oid;
 590        unsigned int flags = 0;
 591        const char *name = NULL;
 592        struct object_context unused;
 593        struct strbuf buf = STRBUF_INIT;
 594
 595        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 596                return cmd_parseopt(argc - 1, argv + 1, prefix);
 597
 598        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 599                return cmd_sq_quote(argc - 2, argv + 2);
 600
 601        if (argc > 1 && !strcmp("-h", argv[1]))
 602                usage(builtin_rev_parse_usage);
 603
 604        for (i = 1; i < argc; i++) {
 605                if (!strcmp(argv[i], "--")) {
 606                        has_dashdash = 1;
 607                        break;
 608                }
 609        }
 610
 611        /* No options; just report on whether we're in a git repo or not. */
 612        if (argc == 1) {
 613                setup_git_directory();
 614                git_config(git_default_config, NULL);
 615                return 0;
 616        }
 617
 618        for (i = 1; i < argc; i++) {
 619                const char *arg = argv[i];
 620
 621                if (!strcmp(arg, "--local-env-vars")) {
 622                        int i;
 623                        for (i = 0; local_repo_env[i]; i++)
 624                                printf("%s\n", local_repo_env[i]);
 625                        continue;
 626                }
 627                if (!strcmp(arg, "--resolve-git-dir")) {
 628                        const char *gitdir = argv[++i];
 629                        if (!gitdir)
 630                                die("--resolve-git-dir requires an argument");
 631                        gitdir = resolve_gitdir(gitdir);
 632                        if (!gitdir)
 633                                die("not a gitdir '%s'", argv[i]);
 634                        puts(gitdir);
 635                        continue;
 636                }
 637
 638                /* The rest of the options require a git repository. */
 639                if (!did_repo_setup) {
 640                        prefix = setup_git_directory();
 641                        git_config(git_default_config, NULL);
 642                        did_repo_setup = 1;
 643                }
 644
 645                if (!strcmp(arg, "--git-path")) {
 646                        if (!argv[i + 1])
 647                                die("--git-path requires an argument");
 648                        strbuf_reset(&buf);
 649                        puts(relative_path(git_path("%s", argv[i + 1]),
 650                                           prefix, &buf));
 651                        i++;
 652                        continue;
 653                }
 654                if (as_is) {
 655                        if (show_file(arg, output_prefix) && as_is < 2)
 656                                verify_filename(prefix, arg, 0);
 657                        continue;
 658                }
 659                if (!strcmp(arg,"-n")) {
 660                        if (++i >= argc)
 661                                die("-n requires an argument");
 662                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 663                                show(arg);
 664                                show(argv[i]);
 665                        }
 666                        continue;
 667                }
 668                if (starts_with(arg, "-n")) {
 669                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 670                                show(arg);
 671                        continue;
 672                }
 673
 674                if (*arg == '-') {
 675                        if (!strcmp(arg, "--")) {
 676                                as_is = 2;
 677                                /* Pass on the "--" if we show anything but files.. */
 678                                if (filter & (DO_FLAGS | DO_REVS))
 679                                        show_file(arg, 0);
 680                                continue;
 681                        }
 682                        if (!strcmp(arg, "--default")) {
 683                                def = argv[++i];
 684                                if (!def)
 685                                        die("--default requires an argument");
 686                                continue;
 687                        }
 688                        if (!strcmp(arg, "--prefix")) {
 689                                prefix = argv[++i];
 690                                if (!prefix)
 691                                        die("--prefix requires an argument");
 692                                startup_info->prefix = prefix;
 693                                output_prefix = 1;
 694                                continue;
 695                        }
 696                        if (!strcmp(arg, "--revs-only")) {
 697                                filter &= ~DO_NOREV;
 698                                continue;
 699                        }
 700                        if (!strcmp(arg, "--no-revs")) {
 701                                filter &= ~DO_REVS;
 702                                continue;
 703                        }
 704                        if (!strcmp(arg, "--flags")) {
 705                                filter &= ~DO_NONFLAGS;
 706                                continue;
 707                        }
 708                        if (!strcmp(arg, "--no-flags")) {
 709                                filter &= ~DO_FLAGS;
 710                                continue;
 711                        }
 712                        if (!strcmp(arg, "--verify")) {
 713                                filter &= ~(DO_FLAGS|DO_NOREV);
 714                                verify = 1;
 715                                continue;
 716                        }
 717                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 718                                quiet = 1;
 719                                flags |= GET_OID_QUIETLY;
 720                                continue;
 721                        }
 722                        if (opt_with_value(arg, "--short", &arg)) {
 723                                filter &= ~(DO_FLAGS|DO_NOREV);
 724                                verify = 1;
 725                                abbrev = DEFAULT_ABBREV;
 726                                if (!arg)
 727                                        continue;
 728                                abbrev = strtoul(arg, NULL, 10);
 729                                if (abbrev < MINIMUM_ABBREV)
 730                                        abbrev = MINIMUM_ABBREV;
 731                                else if (40 <= abbrev)
 732                                        abbrev = 40;
 733                                continue;
 734                        }
 735                        if (!strcmp(arg, "--sq")) {
 736                                output_sq = 1;
 737                                continue;
 738                        }
 739                        if (!strcmp(arg, "--not")) {
 740                                show_type ^= REVERSED;
 741                                continue;
 742                        }
 743                        if (!strcmp(arg, "--symbolic")) {
 744                                symbolic = SHOW_SYMBOLIC_ASIS;
 745                                continue;
 746                        }
 747                        if (!strcmp(arg, "--symbolic-full-name")) {
 748                                symbolic = SHOW_SYMBOLIC_FULL;
 749                                continue;
 750                        }
 751                        if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 752                                abbrev_ref = 1;
 753                                abbrev_ref_strict = warn_ambiguous_refs;
 754                                if (arg) {
 755                                        if (!strcmp(arg, "strict"))
 756                                                abbrev_ref_strict = 1;
 757                                        else if (!strcmp(arg, "loose"))
 758                                                abbrev_ref_strict = 0;
 759                                        else
 760                                                die("unknown mode for --abbrev-ref: %s",
 761                                                    arg);
 762                                }
 763                                continue;
 764                        }
 765                        if (!strcmp(arg, "--all")) {
 766                                for_each_ref(show_reference, NULL);
 767                                continue;
 768                        }
 769                        if (skip_prefix(arg, "--disambiguate=", &arg)) {
 770                                for_each_abbrev(arg, show_abbrev, NULL);
 771                                continue;
 772                        }
 773                        if (!strcmp(arg, "--bisect")) {
 774                                for_each_fullref_in("refs/bisect/bad", show_reference, NULL, 0);
 775                                for_each_fullref_in("refs/bisect/good", anti_reference, NULL, 0);
 776                                continue;
 777                        }
 778                        if (opt_with_value(arg, "--branches", &arg)) {
 779                                handle_ref_opt(arg, "refs/heads/");
 780                                continue;
 781                        }
 782                        if (opt_with_value(arg, "--tags", &arg)) {
 783                                handle_ref_opt(arg, "refs/tags/");
 784                                continue;
 785                        }
 786                        if (skip_prefix(arg, "--glob=", &arg)) {
 787                                handle_ref_opt(arg, NULL);
 788                                continue;
 789                        }
 790                        if (opt_with_value(arg, "--remotes", &arg)) {
 791                                handle_ref_opt(arg, "refs/remotes/");
 792                                continue;
 793                        }
 794                        if (skip_prefix(arg, "--exclude=", &arg)) {
 795                                add_ref_exclusion(&ref_excludes, arg);
 796                                continue;
 797                        }
 798                        if (!strcmp(arg, "--show-toplevel")) {
 799                                const char *work_tree = get_git_work_tree();
 800                                if (work_tree)
 801                                        puts(work_tree);
 802                                continue;
 803                        }
 804                        if (!strcmp(arg, "--show-superproject-working-tree")) {
 805                                const char *superproject = get_superproject_working_tree();
 806                                if (superproject)
 807                                        puts(superproject);
 808                                continue;
 809                        }
 810                        if (!strcmp(arg, "--show-prefix")) {
 811                                if (prefix)
 812                                        puts(prefix);
 813                                else
 814                                        putchar('\n');
 815                                continue;
 816                        }
 817                        if (!strcmp(arg, "--show-cdup")) {
 818                                const char *pfx = prefix;
 819                                if (!is_inside_work_tree()) {
 820                                        const char *work_tree =
 821                                                get_git_work_tree();
 822                                        if (work_tree)
 823                                                printf("%s\n", work_tree);
 824                                        continue;
 825                                }
 826                                while (pfx) {
 827                                        pfx = strchr(pfx, '/');
 828                                        if (pfx) {
 829                                                pfx++;
 830                                                printf("../");
 831                                        }
 832                                }
 833                                putchar('\n');
 834                                continue;
 835                        }
 836                        if (!strcmp(arg, "--git-dir") ||
 837                            !strcmp(arg, "--absolute-git-dir")) {
 838                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 839                                char *cwd;
 840                                int len;
 841                                if (arg[2] == 'g') {    /* --git-dir */
 842                                        if (gitdir) {
 843                                                puts(gitdir);
 844                                                continue;
 845                                        }
 846                                        if (!prefix) {
 847                                                puts(".git");
 848                                                continue;
 849                                        }
 850                                } else {                /* --absolute-git-dir */
 851                                        if (!gitdir && !prefix)
 852                                                gitdir = ".git";
 853                                        if (gitdir) {
 854                                                puts(real_path(gitdir));
 855                                                continue;
 856                                        }
 857                                }
 858                                cwd = xgetcwd();
 859                                len = strlen(cwd);
 860                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 861                                free(cwd);
 862                                continue;
 863                        }
 864                        if (!strcmp(arg, "--git-common-dir")) {
 865                                strbuf_reset(&buf);
 866                                puts(relative_path(get_git_common_dir(),
 867                                                   prefix, &buf));
 868                                continue;
 869                        }
 870                        if (!strcmp(arg, "--is-inside-git-dir")) {
 871                                printf("%s\n", is_inside_git_dir() ? "true"
 872                                                : "false");
 873                                continue;
 874                        }
 875                        if (!strcmp(arg, "--is-inside-work-tree")) {
 876                                printf("%s\n", is_inside_work_tree() ? "true"
 877                                                : "false");
 878                                continue;
 879                        }
 880                        if (!strcmp(arg, "--is-bare-repository")) {
 881                                printf("%s\n", is_bare_repository() ? "true"
 882                                                : "false");
 883                                continue;
 884                        }
 885                        if (!strcmp(arg, "--is-shallow-repository")) {
 886                                printf("%s\n",
 887                                                is_repository_shallow(the_repository) ? "true"
 888                                                : "false");
 889                                continue;
 890                        }
 891                        if (!strcmp(arg, "--shared-index-path")) {
 892                                if (read_cache() < 0)
 893                                        die(_("Could not read the index"));
 894                                if (the_index.split_index) {
 895                                        const struct object_id *oid = &the_index.split_index->base_oid;
 896                                        const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
 897                                        strbuf_reset(&buf);
 898                                        puts(relative_path(path, prefix, &buf));
 899                                }
 900                                continue;
 901                        }
 902                        if (skip_prefix(arg, "--since=", &arg)) {
 903                                show_datestring("--max-age=", arg);
 904                                continue;
 905                        }
 906                        if (skip_prefix(arg, "--after=", &arg)) {
 907                                show_datestring("--max-age=", arg);
 908                                continue;
 909                        }
 910                        if (skip_prefix(arg, "--before=", &arg)) {
 911                                show_datestring("--min-age=", arg);
 912                                continue;
 913                        }
 914                        if (skip_prefix(arg, "--until=", &arg)) {
 915                                show_datestring("--min-age=", arg);
 916                                continue;
 917                        }
 918                        if (show_flag(arg) && verify)
 919                                die_no_single_rev(quiet);
 920                        continue;
 921                }
 922
 923                /* Not a flag argument */
 924                if (try_difference(arg))
 925                        continue;
 926                if (try_parent_shorthands(arg))
 927                        continue;
 928                name = arg;
 929                type = NORMAL;
 930                if (*arg == '^') {
 931                        name++;
 932                        type = REVERSED;
 933                }
 934                if (!get_oid_with_context(name, flags, &oid, &unused)) {
 935                        if (verify)
 936                                revs_count++;
 937                        else
 938                                show_rev(type, &oid, name);
 939                        continue;
 940                }
 941                if (verify)
 942                        die_no_single_rev(quiet);
 943                if (has_dashdash)
 944                        die("bad revision '%s'", arg);
 945                as_is = 1;
 946                if (!show_file(arg, output_prefix))
 947                        continue;
 948                verify_filename(prefix, arg, 1);
 949        }
 950        strbuf_release(&buf);
 951        if (verify) {
 952                if (revs_count == 1) {
 953                        show_rev(type, &oid, name);
 954                        return 0;
 955                } else if (revs_count == 0 && show_default())
 956                        return 0;
 957                die_no_single_rev(quiet);
 958        } else
 959                show_default();
 960        return 0;
 961}