Andrew's git - gitweb.git/blob - builtin/rev-parse.c

   1/*
   2 * rev-parse.c
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "commit.h"
   8#include "refs.h"
   9#include "quote.h"
  10#include "builtin.h"
  11#include "parse-options.h"
  12
  13#define DO_REVS         1
  14#define DO_NOREV        2
  15#define DO_FLAGS        4
  16#define DO_NONFLAGS     8
  17static int filter = ~0;
  18
  19static const char *def;
  20
  21#define NORMAL 0
  22#define REVERSED 1
  23static int show_type = NORMAL;
  24
  25#define SHOW_SYMBOLIC_ASIS 1
  26#define SHOW_SYMBOLIC_FULL 2
  27static int symbolic;
  28static int abbrev;
  29static int abbrev_ref;
  30static int abbrev_ref_strict;
  31static int output_sq;
  32
  33/*
  34 * Some arguments are relevant "revision" arguments,
  35 * others are about output format or other details.
  36 * This sorts it all out.
  37 */
  38static int is_rev_argument(const char *arg)
  39{
  40        static const char *rev_args[] = {
  41                "--all",
  42                "--bisect",
  43                "--dense",
  44                "--branches=",
  45                "--branches",
  46                "--header",
  47                "--ignore-missing",
  48                "--max-age=",
  49                "--max-count=",
  50                "--min-age=",
  51                "--no-merges",
  52                "--min-parents=",
  53                "--no-min-parents",
  54                "--max-parents=",
  55                "--no-max-parents",
  56                "--objects",
  57                "--objects-edge",
  58                "--parents",
  59                "--pretty",
  60                "--remotes=",
  61                "--remotes",
  62                "--glob=",
  63                "--sparse",
  64                "--tags=",
  65                "--tags",
  66                "--topo-order",
  67                "--date-order",
  68                "--unpacked",
  69                NULL
  70        };
  71        const char **p = rev_args;
  72
  73        /* accept -<digit>, like traditional "head" */
  74        if ((*arg == '-') && isdigit(arg[1]))
  75                return 1;
  76
  77        for (;;) {
  78                const char *str = *p++;
  79                int len;
  80                if (!str)
  81                        return 0;
  82                len = strlen(str);
  83                if (!strcmp(arg, str) ||
  84                    (str[len-1] == '=' && !strncmp(arg, str, len)))
  85                        return 1;
  86        }
  87}
  88
  89/* Output argument as a string, either SQ or normal */
  90static void show(const char *arg)
  91{
  92        if (output_sq) {
  93                int sq = '\'', ch;
  94
  95                putchar(sq);
  96                while ((ch = *arg++)) {
  97                        if (ch == sq)
  98                                fputs("'\\'", stdout);
  99                        putchar(ch);
 100                }
 101                putchar(sq);
 102                putchar(' ');
 103        }
 104        else
 105                puts(arg);
 106}
 107
 108/* Like show(), but with a negation prefix according to type */
 109static void show_with_type(int type, const char *arg)
 110{
 111        if (type != show_type)
 112                putchar('^');
 113        show(arg);
 114}
 115
 116/* Output a revision, only if filter allows it */
 117static void show_rev(int type, const unsigned char *sha1, const char *name)
 118{
 119        if (!(filter & DO_REVS))
 120                return;
 121        def = NULL;
 122
 123        if ((symbolic || abbrev_ref) && name) {
 124                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 125                        unsigned char discard[20];
 126                        char *full;
 127
 128                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 129                        case 0:
 130                                /*
 131                                 * Not found -- not a ref.  We could
 132                                 * emit "name" here, but symbolic-full
 133                                 * users are interested in finding the
 134                                 * refs spelled in full, and they would
 135                                 * need to filter non-refs if we did so.
 136                                 */
 137                                break;
 138                        case 1: /* happy */
 139                                if (abbrev_ref)
 140                                        full = shorten_unambiguous_ref(full,
 141                                                abbrev_ref_strict);
 142                                show_with_type(type, full);
 143                                break;
 144                        default: /* ambiguous */
 145                                error("refname '%s' is ambiguous", name);
 146                                break;
 147                        }
 148                } else {
 149                        show_with_type(type, name);
 150                }
 151        }
 152        else if (abbrev)
 153                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 154        else
 155                show_with_type(type, sha1_to_hex(sha1));
 156}
 157
 158/* Output a flag, only if filter allows it. */
 159static int show_flag(const char *arg)
 160{
 161        if (!(filter & DO_FLAGS))
 162                return 0;
 163        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 164                show(arg);
 165                return 1;
 166        }
 167        return 0;
 168}
 169
 170static int show_default(void)
 171{
 172        const char *s = def;
 173
 174        if (s) {
 175                unsigned char sha1[20];
 176
 177                def = NULL;
 178                if (!get_sha1(s, sha1)) {
 179                        show_rev(NORMAL, sha1, s);
 180                        return 1;
 181                }
 182        }
 183        return 0;
 184}
 185
 186static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 187{
 188        show_rev(NORMAL, sha1, refname);
 189        return 0;
 190}
 191
 192static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 193{
 194        show_rev(REVERSED, sha1, refname);
 195        return 0;
 196}
 197
 198static int show_abbrev(const unsigned char *sha1, void *cb_data)
 199{
 200        show_rev(NORMAL, sha1, NULL);
 201        return 0;
 202}
 203
 204static void show_datestring(const char *flag, const char *datestr)
 205{
 206        static char buffer[100];
 207
 208        /* date handling requires both flags and revs */
 209        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 210                return;
 211        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 212        show(buffer);
 213}
 214
 215static int show_file(const char *arg)
 216{
 217        show_default();
 218        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 219                show(arg);
 220                return 1;
 221        }
 222        return 0;
 223}
 224
 225static int try_difference(const char *arg)
 226{
 227        char *dotdot;
 228        unsigned char sha1[20];
 229        unsigned char end[20];
 230        const char *next;
 231        const char *this;
 232        int symmetric;
 233        static const char head_by_default[] = "HEAD";
 234
 235        if (!(dotdot = strstr(arg, "..")))
 236                return 0;
 237        next = dotdot + 2;
 238        this = arg;
 239        symmetric = (*next == '.');
 240
 241        *dotdot = 0;
 242        next += symmetric;
 243
 244        if (!*next)
 245                next = head_by_default;
 246        if (dotdot == arg)
 247                this = head_by_default;
 248
 249        if (this == head_by_default && next == head_by_default &&
 250            !symmetric) {
 251                /*
 252                 * Just ".."?  That is not a range but the
 253                 * pathspec for the parent directory.
 254                 */
 255                *dotdot = '.';
 256                return 0;
 257        }
 258
 259        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 260                show_rev(NORMAL, end, next);
 261                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 262                if (symmetric) {
 263                        struct commit_list *exclude;
 264                        struct commit *a, *b;
 265                        a = lookup_commit_reference(sha1);
 266                        b = lookup_commit_reference(end);
 267                        exclude = get_merge_bases(a, b, 1);
 268                        while (exclude) {
 269                                struct commit_list *n = exclude->next;
 270                                show_rev(REVERSED,
 271                                         exclude->item->object.sha1,NULL);
 272                                free(exclude);
 273                                exclude = n;
 274                        }
 275                }
 276                return 1;
 277        }
 278        *dotdot = '.';
 279        return 0;
 280}
 281
 282static int try_parent_shorthands(const char *arg)
 283{
 284        char *dotdot;
 285        unsigned char sha1[20];
 286        struct commit *commit;
 287        struct commit_list *parents;
 288        int parents_only;
 289
 290        if ((dotdot = strstr(arg, "^!")))
 291                parents_only = 0;
 292        else if ((dotdot = strstr(arg, "^@")))
 293                parents_only = 1;
 294
 295        if (!dotdot || dotdot[2])
 296                return 0;
 297
 298        *dotdot = 0;
 299        if (get_sha1_committish(arg, sha1))
 300                return 0;
 301
 302        if (!parents_only)
 303                show_rev(NORMAL, sha1, arg);
 304        commit = lookup_commit_reference(sha1);
 305        for (parents = commit->parents; parents; parents = parents->next)
 306                show_rev(parents_only ? NORMAL : REVERSED,
 307                                parents->item->object.sha1, arg);
 308
 309        return 1;
 310}
 311
 312static int parseopt_dump(const struct option *o, const char *arg, int unset)
 313{
 314        struct strbuf *parsed = o->value;
 315        if (unset)
 316                strbuf_addf(parsed, " --no-%s", o->long_name);
 317        else if (o->short_name)
 318                strbuf_addf(parsed, " -%c", o->short_name);
 319        else
 320                strbuf_addf(parsed, " --%s", o->long_name);
 321        if (arg) {
 322                strbuf_addch(parsed, ' ');
 323                sq_quote_buf(parsed, arg);
 324        }
 325        return 0;
 326}
 327
 328static const char *skipspaces(const char *s)
 329{
 330        while (isspace(*s))
 331                s++;
 332        return s;
 333}
 334
 335static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 336{
 337        static int keep_dashdash = 0, stop_at_non_option = 0;
 338        static char const * const parseopt_usage[] = {
 339                N_("git rev-parse --parseopt [options] -- [<args>...]"),
 340                NULL
 341        };
 342        static struct option parseopt_opts[] = {
 343                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 344                                        N_("keep the `--` passed as an arg")),
 345                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 346                                        N_("stop parsing after the "
 347                                           "first non-option argument")),
 348                OPT_END(),
 349        };
 350
 351        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 352        const char **usage = NULL;
 353        struct option *opts = NULL;
 354        int onb = 0, osz = 0, unb = 0, usz = 0;
 355
 356        strbuf_addstr(&parsed, "set --");
 357        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 358                             PARSE_OPT_KEEP_DASHDASH);
 359        if (argc < 1 || strcmp(argv[0], "--"))
 360                usage_with_options(parseopt_usage, parseopt_opts);
 361
 362        /* get the usage up to the first line with a -- on it */
 363        for (;;) {
 364                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 365                        die("premature end of input");
 366                ALLOC_GROW(usage, unb + 1, usz);
 367                if (!strcmp("--", sb.buf)) {
 368                        if (unb < 1)
 369                                die("no usage string given before the `--' separator");
 370                        usage[unb] = NULL;
 371                        break;
 372                }
 373                usage[unb++] = strbuf_detach(&sb, NULL);
 374        }
 375
 376        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 377        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 378                const char *s;
 379                struct option *o;
 380
 381                if (!sb.len)
 382                        continue;
 383
 384                ALLOC_GROW(opts, onb + 1, osz);
 385                memset(opts + onb, 0, sizeof(opts[onb]));
 386
 387                o = &opts[onb++];
 388                s = strchr(sb.buf, ' ');
 389                if (!s || *sb.buf == ' ') {
 390                        o->type = OPTION_GROUP;
 391                        o->help = xstrdup(skipspaces(sb.buf));
 392                        continue;
 393                }
 394
 395                o->type = OPTION_CALLBACK;
 396                o->help = xstrdup(skipspaces(s));
 397                o->value = &parsed;
 398                o->flags = PARSE_OPT_NOARG;
 399                o->callback = &parseopt_dump;
 400                while (s > sb.buf && strchr("*=?!", s[-1])) {
 401                        switch (*--s) {
 402                        case '=':
 403                                o->flags &= ~PARSE_OPT_NOARG;
 404                                break;
 405                        case '?':
 406                                o->flags &= ~PARSE_OPT_NOARG;
 407                                o->flags |= PARSE_OPT_OPTARG;
 408                                break;
 409                        case '!':
 410                                o->flags |= PARSE_OPT_NONEG;
 411                                break;
 412                        case '*':
 413                                o->flags |= PARSE_OPT_HIDDEN;
 414                                break;
 415                        }
 416                }
 417
 418                if (s - sb.buf == 1) /* short option only */
 419                        o->short_name = *sb.buf;
 420                else if (sb.buf[1] != ',') /* long option only */
 421                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 422                else {
 423                        o->short_name = *sb.buf;
 424                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 425                }
 426        }
 427        strbuf_release(&sb);
 428
 429        /* put an OPT_END() */
 430        ALLOC_GROW(opts, onb + 1, osz);
 431        memset(opts + onb, 0, sizeof(opts[onb]));
 432        argc = parse_options(argc, argv, prefix, opts, usage,
 433                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 434                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 435                        PARSE_OPT_SHELL_EVAL);
 436
 437        strbuf_addf(&parsed, " --");
 438        sq_quote_argv(&parsed, argv, 0);
 439        puts(parsed.buf);
 440        return 0;
 441}
 442
 443static int cmd_sq_quote(int argc, const char **argv)
 444{
 445        struct strbuf buf = STRBUF_INIT;
 446
 447        if (argc)
 448                sq_quote_argv(&buf, argv, 0);
 449        printf("%s\n", buf.buf);
 450        strbuf_release(&buf);
 451
 452        return 0;
 453}
 454
 455static void die_no_single_rev(int quiet)
 456{
 457        if (quiet)
 458                exit(1);
 459        else
 460                die("Needed a single revision");
 461}
 462
 463static const char builtin_rev_parse_usage[] =
 464N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 465   "   or: git rev-parse --sq-quote [<arg>...]\n"
 466   "   or: git rev-parse [options] [<arg>...]\n"
 467   "\n"
 468   "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 469
 470int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 471{
 472        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 473        unsigned char sha1[20];
 474        const char *name = NULL;
 475
 476        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 477                return cmd_parseopt(argc - 1, argv + 1, prefix);
 478
 479        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 480                return cmd_sq_quote(argc - 2, argv + 2);
 481
 482        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 483                int i;
 484                for (i = 0; local_repo_env[i]; i++)
 485                        printf("%s\n", local_repo_env[i]);
 486                return 0;
 487        }
 488
 489        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 490                const char *gitdir = resolve_gitdir(argv[2]);
 491                if (!gitdir)
 492                        die("not a gitdir '%s'", argv[2]);
 493                puts(gitdir);
 494                return 0;
 495        }
 496
 497        if (argc > 1 && !strcmp("-h", argv[1]))
 498                usage(builtin_rev_parse_usage);
 499
 500        prefix = setup_git_directory();
 501        git_config(git_default_config, NULL);
 502        for (i = 1; i < argc; i++) {
 503                const char *arg = argv[i];
 504
 505                if (as_is) {
 506                        if (show_file(arg) && as_is < 2)
 507                                verify_filename(prefix, arg, 0);
 508                        continue;
 509                }
 510                if (!strcmp(arg,"-n")) {
 511                        if (++i >= argc)
 512                                die("-n requires an argument");
 513                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 514                                show(arg);
 515                                show(argv[i]);
 516                        }
 517                        continue;
 518                }
 519                if (!prefixcmp(arg, "-n")) {
 520                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 521                                show(arg);
 522                        continue;
 523                }
 524
 525                if (*arg == '-') {
 526                        if (!strcmp(arg, "--")) {
 527                                as_is = 2;
 528                                /* Pass on the "--" if we show anything but files.. */
 529                                if (filter & (DO_FLAGS | DO_REVS))
 530                                        show_file(arg);
 531                                continue;
 532                        }
 533                        if (!strcmp(arg, "--default")) {
 534                                def = argv[i+1];
 535                                i++;
 536                                continue;
 537                        }
 538                        if (!strcmp(arg, "--revs-only")) {
 539                                filter &= ~DO_NOREV;
 540                                continue;
 541                        }
 542                        if (!strcmp(arg, "--no-revs")) {
 543                                filter &= ~DO_REVS;
 544                                continue;
 545                        }
 546                        if (!strcmp(arg, "--flags")) {
 547                                filter &= ~DO_NONFLAGS;
 548                                continue;
 549                        }
 550                        if (!strcmp(arg, "--no-flags")) {
 551                                filter &= ~DO_FLAGS;
 552                                continue;
 553                        }
 554                        if (!strcmp(arg, "--verify")) {
 555                                filter &= ~(DO_FLAGS|DO_NOREV);
 556                                verify = 1;
 557                                continue;
 558                        }
 559                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 560                                quiet = 1;
 561                                continue;
 562                        }
 563                        if (!strcmp(arg, "--short") ||
 564                            !prefixcmp(arg, "--short=")) {
 565                                filter &= ~(DO_FLAGS|DO_NOREV);
 566                                verify = 1;
 567                                abbrev = DEFAULT_ABBREV;
 568                                if (arg[7] == '=')
 569                                        abbrev = strtoul(arg + 8, NULL, 10);
 570                                if (abbrev < MINIMUM_ABBREV)
 571                                        abbrev = MINIMUM_ABBREV;
 572                                else if (40 <= abbrev)
 573                                        abbrev = 40;
 574                                continue;
 575                        }
 576                        if (!strcmp(arg, "--sq")) {
 577                                output_sq = 1;
 578                                continue;
 579                        }
 580                        if (!strcmp(arg, "--not")) {
 581                                show_type ^= REVERSED;
 582                                continue;
 583                        }
 584                        if (!strcmp(arg, "--symbolic")) {
 585                                symbolic = SHOW_SYMBOLIC_ASIS;
 586                                continue;
 587                        }
 588                        if (!strcmp(arg, "--symbolic-full-name")) {
 589                                symbolic = SHOW_SYMBOLIC_FULL;
 590                                continue;
 591                        }
 592                        if (!prefixcmp(arg, "--abbrev-ref") &&
 593                            (!arg[12] || arg[12] == '=')) {
 594                                abbrev_ref = 1;
 595                                abbrev_ref_strict = warn_ambiguous_refs;
 596                                if (arg[12] == '=') {
 597                                        if (!strcmp(arg + 13, "strict"))
 598                                                abbrev_ref_strict = 1;
 599                                        else if (!strcmp(arg + 13, "loose"))
 600                                                abbrev_ref_strict = 0;
 601                                        else
 602                                                die("unknown mode for %s", arg);
 603                                }
 604                                continue;
 605                        }
 606                        if (!strcmp(arg, "--all")) {
 607                                for_each_ref(show_reference, NULL);
 608                                continue;
 609                        }
 610                        if (!prefixcmp(arg, "--disambiguate=")) {
 611                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 612                                continue;
 613                        }
 614                        if (!strcmp(arg, "--bisect")) {
 615                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 616                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 617                                continue;
 618                        }
 619                        if (!prefixcmp(arg, "--branches=")) {
 620                                for_each_glob_ref_in(show_reference, arg + 11,
 621                                        "refs/heads/", NULL);
 622                                continue;
 623                        }
 624                        if (!strcmp(arg, "--branches")) {
 625                                for_each_branch_ref(show_reference, NULL);
 626                                continue;
 627                        }
 628                        if (!prefixcmp(arg, "--tags=")) {
 629                                for_each_glob_ref_in(show_reference, arg + 7,
 630                                        "refs/tags/", NULL);
 631                                continue;
 632                        }
 633                        if (!strcmp(arg, "--tags")) {
 634                                for_each_tag_ref(show_reference, NULL);
 635                                continue;
 636                        }
 637                        if (!prefixcmp(arg, "--glob=")) {
 638                                for_each_glob_ref(show_reference, arg + 7, NULL);
 639                                continue;
 640                        }
 641                        if (!prefixcmp(arg, "--remotes=")) {
 642                                for_each_glob_ref_in(show_reference, arg + 10,
 643                                        "refs/remotes/", NULL);
 644                                continue;
 645                        }
 646                        if (!strcmp(arg, "--remotes")) {
 647                                for_each_remote_ref(show_reference, NULL);
 648                                continue;
 649                        }
 650                        if (!strcmp(arg, "--show-toplevel")) {
 651                                const char *work_tree = get_git_work_tree();
 652                                if (work_tree)
 653                                        puts(work_tree);
 654                                continue;
 655                        }
 656                        if (!strcmp(arg, "--show-prefix")) {
 657                                if (prefix)
 658                                        puts(prefix);
 659                                else
 660                                        putchar('\n');
 661                                continue;
 662                        }
 663                        if (!strcmp(arg, "--show-cdup")) {
 664                                const char *pfx = prefix;
 665                                if (!is_inside_work_tree()) {
 666                                        const char *work_tree =
 667                                                get_git_work_tree();
 668                                        if (work_tree)
 669                                                printf("%s\n", work_tree);
 670                                        continue;
 671                                }
 672                                while (pfx) {
 673                                        pfx = strchr(pfx, '/');
 674                                        if (pfx) {
 675                                                pfx++;
 676                                                printf("../");
 677                                        }
 678                                }
 679                                putchar('\n');
 680                                continue;
 681                        }
 682                        if (!strcmp(arg, "--git-dir")) {
 683                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 684                                static char cwd[PATH_MAX];
 685                                int len;
 686                                if (gitdir) {
 687                                        puts(gitdir);
 688                                        continue;
 689                                }
 690                                if (!prefix) {
 691                                        puts(".git");
 692                                        continue;
 693                                }
 694                                if (!getcwd(cwd, PATH_MAX))
 695                                        die_errno("unable to get current working directory");
 696                                len = strlen(cwd);
 697                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 698                                continue;
 699                        }
 700                        if (!strcmp(arg, "--is-inside-git-dir")) {
 701                                printf("%s\n", is_inside_git_dir() ? "true"
 702                                                : "false");
 703                                continue;
 704                        }
 705                        if (!strcmp(arg, "--is-inside-work-tree")) {
 706                                printf("%s\n", is_inside_work_tree() ? "true"
 707                                                : "false");
 708                                continue;
 709                        }
 710                        if (!strcmp(arg, "--is-bare-repository")) {
 711                                printf("%s\n", is_bare_repository() ? "true"
 712                                                : "false");
 713                                continue;
 714                        }
 715                        if (!prefixcmp(arg, "--since=")) {
 716                                show_datestring("--max-age=", arg+8);
 717                                continue;
 718                        }
 719                        if (!prefixcmp(arg, "--after=")) {
 720                                show_datestring("--max-age=", arg+8);
 721                                continue;
 722                        }
 723                        if (!prefixcmp(arg, "--before=")) {
 724                                show_datestring("--min-age=", arg+9);
 725                                continue;
 726                        }
 727                        if (!prefixcmp(arg, "--until=")) {
 728                                show_datestring("--min-age=", arg+8);
 729                                continue;
 730                        }
 731                        if (show_flag(arg) && verify)
 732                                die_no_single_rev(quiet);
 733                        continue;
 734                }
 735
 736                /* Not a flag argument */
 737                if (try_difference(arg))
 738                        continue;
 739                if (try_parent_shorthands(arg))
 740                        continue;
 741                name = arg;
 742                type = NORMAL;
 743                if (*arg == '^') {
 744                        name++;
 745                        type = REVERSED;
 746                }
 747                if (!get_sha1(name, sha1)) {
 748                        if (verify)
 749                                revs_count++;
 750                        else
 751                                show_rev(type, sha1, name);
 752                        continue;
 753                }
 754                if (verify)
 755                        die_no_single_rev(quiet);
 756                as_is = 1;
 757                if (!show_file(arg))
 758                        continue;
 759                verify_filename(prefix, arg, 1);
 760        }
 761        if (verify) {
 762                if (revs_count == 1) {
 763                        show_rev(type, sha1, name);
 764                        return 0;
 765                } else if (revs_count == 0 && show_default())
 766                        return 0;
 767                die_no_single_rev(quiet);
 768        } else
 769                show_default();
 770        return 0;
 771}