Andrew's git / gitweb.git / builtin/rev-parse.c
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builtin / rev-parse.con commit Merge branch 'zj/test-cred-helper-nicer-prove' (3ff999e)
   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 void show_datestring(const char *flag, const char *datestr)
 199{
 200        static char buffer[100];
 201
 202        /* date handling requires both flags and revs */
 203        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 204                return;
 205        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 206        show(buffer);
 207}
 208
 209static int show_file(const char *arg)
 210{
 211        show_default();
 212        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 213                show(arg);
 214                return 1;
 215        }
 216        return 0;
 217}
 218
 219static int try_difference(const char *arg)
 220{
 221        char *dotdot;
 222        unsigned char sha1[20];
 223        unsigned char end[20];
 224        const char *next;
 225        const char *this;
 226        int symmetric;
 227
 228        if (!(dotdot = strstr(arg, "..")))
 229                return 0;
 230        next = dotdot + 2;
 231        this = arg;
 232        symmetric = (*next == '.');
 233
 234        *dotdot = 0;
 235        next += symmetric;
 236
 237        if (!*next)
 238                next = "HEAD";
 239        if (dotdot == arg)
 240                this = "HEAD";
 241        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 242                show_rev(NORMAL, end, next);
 243                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 244                if (symmetric) {
 245                        struct commit_list *exclude;
 246                        struct commit *a, *b;
 247                        a = lookup_commit_reference(sha1);
 248                        b = lookup_commit_reference(end);
 249                        exclude = get_merge_bases(a, b, 1);
 250                        while (exclude) {
 251                                struct commit_list *n = exclude->next;
 252                                show_rev(REVERSED,
 253                                         exclude->item->object.sha1,NULL);
 254                                free(exclude);
 255                                exclude = n;
 256                        }
 257                }
 258                return 1;
 259        }
 260        *dotdot = '.';
 261        return 0;
 262}
 263
 264static int try_parent_shorthands(const char *arg)
 265{
 266        char *dotdot;
 267        unsigned char sha1[20];
 268        struct commit *commit;
 269        struct commit_list *parents;
 270        int parents_only;
 271
 272        if ((dotdot = strstr(arg, "^!")))
 273                parents_only = 0;
 274        else if ((dotdot = strstr(arg, "^@")))
 275                parents_only = 1;
 276
 277        if (!dotdot || dotdot[2])
 278                return 0;
 279
 280        *dotdot = 0;
 281        if (get_sha1(arg, sha1))
 282                return 0;
 283
 284        if (!parents_only)
 285                show_rev(NORMAL, sha1, arg);
 286        commit = lookup_commit_reference(sha1);
 287        for (parents = commit->parents; parents; parents = parents->next)
 288                show_rev(parents_only ? NORMAL : REVERSED,
 289                                parents->item->object.sha1, arg);
 290
 291        return 1;
 292}
 293
 294static int parseopt_dump(const struct option *o, const char *arg, int unset)
 295{
 296        struct strbuf *parsed = o->value;
 297        if (unset)
 298                strbuf_addf(parsed, " --no-%s", o->long_name);
 299        else if (o->short_name)
 300                strbuf_addf(parsed, " -%c", o->short_name);
 301        else
 302                strbuf_addf(parsed, " --%s", o->long_name);
 303        if (arg) {
 304                strbuf_addch(parsed, ' ');
 305                sq_quote_buf(parsed, arg);
 306        }
 307        return 0;
 308}
 309
 310static const char *skipspaces(const char *s)
 311{
 312        while (isspace(*s))
 313                s++;
 314        return s;
 315}
 316
 317static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 318{
 319        static int keep_dashdash = 0, stop_at_non_option = 0;
 320        static char const * const parseopt_usage[] = {
 321                "git rev-parse --parseopt [options] -- [<args>...]",
 322                NULL
 323        };
 324        static struct option parseopt_opts[] = {
 325                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 326                                        "keep the `--` passed as an arg"),
 327                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 328                                        "stop parsing after the "
 329                                        "first non-option argument"),
 330                OPT_END(),
 331        };
 332
 333        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 334        const char **usage = NULL;
 335        struct option *opts = NULL;
 336        int onb = 0, osz = 0, unb = 0, usz = 0;
 337
 338        strbuf_addstr(&parsed, "set --");
 339        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 340                             PARSE_OPT_KEEP_DASHDASH);
 341        if (argc < 1 || strcmp(argv[0], "--"))
 342                usage_with_options(parseopt_usage, parseopt_opts);
 343
 344        /* get the usage up to the first line with a -- on it */
 345        for (;;) {
 346                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 347                        die("premature end of input");
 348                ALLOC_GROW(usage, unb + 1, usz);
 349                if (!strcmp("--", sb.buf)) {
 350                        if (unb < 1)
 351                                die("no usage string given before the `--' separator");
 352                        usage[unb] = NULL;
 353                        break;
 354                }
 355                usage[unb++] = strbuf_detach(&sb, NULL);
 356        }
 357
 358        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 359        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 360                const char *s;
 361                struct option *o;
 362
 363                if (!sb.len)
 364                        continue;
 365
 366                ALLOC_GROW(opts, onb + 1, osz);
 367                memset(opts + onb, 0, sizeof(opts[onb]));
 368
 369                o = &opts[onb++];
 370                s = strchr(sb.buf, ' ');
 371                if (!s || *sb.buf == ' ') {
 372                        o->type = OPTION_GROUP;
 373                        o->help = xstrdup(skipspaces(sb.buf));
 374                        continue;
 375                }
 376
 377                o->type = OPTION_CALLBACK;
 378                o->help = xstrdup(skipspaces(s));
 379                o->value = &parsed;
 380                o->flags = PARSE_OPT_NOARG;
 381                o->callback = &parseopt_dump;
 382                while (s > sb.buf && strchr("*=?!", s[-1])) {
 383                        switch (*--s) {
 384                        case '=':
 385                                o->flags &= ~PARSE_OPT_NOARG;
 386                                break;
 387                        case '?':
 388                                o->flags &= ~PARSE_OPT_NOARG;
 389                                o->flags |= PARSE_OPT_OPTARG;
 390                                break;
 391                        case '!':
 392                                o->flags |= PARSE_OPT_NONEG;
 393                                break;
 394                        case '*':
 395                                o->flags |= PARSE_OPT_HIDDEN;
 396                                break;
 397                        }
 398                }
 399
 400                if (s - sb.buf == 1) /* short option only */
 401                        o->short_name = *sb.buf;
 402                else if (sb.buf[1] != ',') /* long option only */
 403                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 404                else {
 405                        o->short_name = *sb.buf;
 406                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 407                }
 408        }
 409        strbuf_release(&sb);
 410
 411        /* put an OPT_END() */
 412        ALLOC_GROW(opts, onb + 1, osz);
 413        memset(opts + onb, 0, sizeof(opts[onb]));
 414        argc = parse_options(argc, argv, prefix, opts, usage,
 415                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 416                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 417                        PARSE_OPT_SHELL_EVAL);
 418
 419        strbuf_addf(&parsed, " --");
 420        sq_quote_argv(&parsed, argv, 0);
 421        puts(parsed.buf);
 422        return 0;
 423}
 424
 425static int cmd_sq_quote(int argc, const char **argv)
 426{
 427        struct strbuf buf = STRBUF_INIT;
 428
 429        if (argc)
 430                sq_quote_argv(&buf, argv, 0);
 431        printf("%s\n", buf.buf);
 432        strbuf_release(&buf);
 433
 434        return 0;
 435}
 436
 437static void die_no_single_rev(int quiet)
 438{
 439        if (quiet)
 440                exit(1);
 441        else
 442                die("Needed a single revision");
 443}
 444
 445static const char builtin_rev_parse_usage[] =
 446"git rev-parse --parseopt [options] -- [<args>...]\n"
 447"   or: git rev-parse --sq-quote [<arg>...]\n"
 448"   or: git rev-parse [options] [<arg>...]\n"
 449"\n"
 450"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 451
 452int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 453{
 454        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 455        unsigned char sha1[20];
 456        const char *name = NULL;
 457
 458        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 459                return cmd_parseopt(argc - 1, argv + 1, prefix);
 460
 461        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 462                return cmd_sq_quote(argc - 2, argv + 2);
 463
 464        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 465                int i;
 466                for (i = 0; local_repo_env[i]; i++)
 467                        printf("%s\n", local_repo_env[i]);
 468                return 0;
 469        }
 470
 471        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 472                const char *gitdir = resolve_gitdir(argv[2]);
 473                if (!gitdir)
 474                        die("not a gitdir '%s'", argv[2]);
 475                puts(gitdir);
 476                return 0;
 477        }
 478
 479        if (argc > 1 && !strcmp("-h", argv[1]))
 480                usage(builtin_rev_parse_usage);
 481
 482        prefix = setup_git_directory();
 483        git_config(git_default_config, NULL);
 484        for (i = 1; i < argc; i++) {
 485                const char *arg = argv[i];
 486
 487                if (as_is) {
 488                        if (show_file(arg) && as_is < 2)
 489                                verify_filename(prefix, arg);
 490                        continue;
 491                }
 492                if (!strcmp(arg,"-n")) {
 493                        if (++i >= argc)
 494                                die("-n requires an argument");
 495                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 496                                show(arg);
 497                                show(argv[i]);
 498                        }
 499                        continue;
 500                }
 501                if (!prefixcmp(arg, "-n")) {
 502                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 503                                show(arg);
 504                        continue;
 505                }
 506
 507                if (*arg == '-') {
 508                        if (!strcmp(arg, "--")) {
 509                                as_is = 2;
 510                                /* Pass on the "--" if we show anything but files.. */
 511                                if (filter & (DO_FLAGS | DO_REVS))
 512                                        show_file(arg);
 513                                continue;
 514                        }
 515                        if (!strcmp(arg, "--default")) {
 516                                def = argv[i+1];
 517                                i++;
 518                                continue;
 519                        }
 520                        if (!strcmp(arg, "--revs-only")) {
 521                                filter &= ~DO_NOREV;
 522                                continue;
 523                        }
 524                        if (!strcmp(arg, "--no-revs")) {
 525                                filter &= ~DO_REVS;
 526                                continue;
 527                        }
 528                        if (!strcmp(arg, "--flags")) {
 529                                filter &= ~DO_NONFLAGS;
 530                                continue;
 531                        }
 532                        if (!strcmp(arg, "--no-flags")) {
 533                                filter &= ~DO_FLAGS;
 534                                continue;
 535                        }
 536                        if (!strcmp(arg, "--verify")) {
 537                                filter &= ~(DO_FLAGS|DO_NOREV);
 538                                verify = 1;
 539                                continue;
 540                        }
 541                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 542                                quiet = 1;
 543                                continue;
 544                        }
 545                        if (!strcmp(arg, "--short") ||
 546                            !prefixcmp(arg, "--short=")) {
 547                                filter &= ~(DO_FLAGS|DO_NOREV);
 548                                verify = 1;
 549                                abbrev = DEFAULT_ABBREV;
 550                                if (arg[7] == '=')
 551                                        abbrev = strtoul(arg + 8, NULL, 10);
 552                                if (abbrev < MINIMUM_ABBREV)
 553                                        abbrev = MINIMUM_ABBREV;
 554                                else if (40 <= abbrev)
 555                                        abbrev = 40;
 556                                continue;
 557                        }
 558                        if (!strcmp(arg, "--sq")) {
 559                                output_sq = 1;
 560                                continue;
 561                        }
 562                        if (!strcmp(arg, "--not")) {
 563                                show_type ^= REVERSED;
 564                                continue;
 565                        }
 566                        if (!strcmp(arg, "--symbolic")) {
 567                                symbolic = SHOW_SYMBOLIC_ASIS;
 568                                continue;
 569                        }
 570                        if (!strcmp(arg, "--symbolic-full-name")) {
 571                                symbolic = SHOW_SYMBOLIC_FULL;
 572                                continue;
 573                        }
 574                        if (!prefixcmp(arg, "--abbrev-ref") &&
 575                            (!arg[12] || arg[12] == '=')) {
 576                                abbrev_ref = 1;
 577                                abbrev_ref_strict = warn_ambiguous_refs;
 578                                if (arg[12] == '=') {
 579                                        if (!strcmp(arg + 13, "strict"))
 580                                                abbrev_ref_strict = 1;
 581                                        else if (!strcmp(arg + 13, "loose"))
 582                                                abbrev_ref_strict = 0;
 583                                        else
 584                                                die("unknown mode for %s", arg);
 585                                }
 586                                continue;
 587                        }
 588                        if (!strcmp(arg, "--all")) {
 589                                for_each_ref(show_reference, NULL);
 590                                continue;
 591                        }
 592                        if (!strcmp(arg, "--bisect")) {
 593                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 594                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 595                                continue;
 596                        }
 597                        if (!prefixcmp(arg, "--branches=")) {
 598                                for_each_glob_ref_in(show_reference, arg + 11,
 599                                        "refs/heads/", NULL);
 600                                continue;
 601                        }
 602                        if (!strcmp(arg, "--branches")) {
 603                                for_each_branch_ref(show_reference, NULL);
 604                                continue;
 605                        }
 606                        if (!prefixcmp(arg, "--tags=")) {
 607                                for_each_glob_ref_in(show_reference, arg + 7,
 608                                        "refs/tags/", NULL);
 609                                continue;
 610                        }
 611                        if (!strcmp(arg, "--tags")) {
 612                                for_each_tag_ref(show_reference, NULL);
 613                                continue;
 614                        }
 615                        if (!prefixcmp(arg, "--glob=")) {
 616                                for_each_glob_ref(show_reference, arg + 7, NULL);
 617                                continue;
 618                        }
 619                        if (!prefixcmp(arg, "--remotes=")) {
 620                                for_each_glob_ref_in(show_reference, arg + 10,
 621                                        "refs/remotes/", NULL);
 622                                continue;
 623                        }
 624                        if (!strcmp(arg, "--remotes")) {
 625                                for_each_remote_ref(show_reference, NULL);
 626                                continue;
 627                        }
 628                        if (!strcmp(arg, "--show-toplevel")) {
 629                                const char *work_tree = get_git_work_tree();
 630                                if (work_tree)
 631                                        puts(work_tree);
 632                                continue;
 633                        }
 634                        if (!strcmp(arg, "--show-prefix")) {
 635                                if (prefix)
 636                                        puts(prefix);
 637                                continue;
 638                        }
 639                        if (!strcmp(arg, "--show-cdup")) {
 640                                const char *pfx = prefix;
 641                                if (!is_inside_work_tree()) {
 642                                        const char *work_tree =
 643                                                get_git_work_tree();
 644                                        if (work_tree)
 645                                                printf("%s\n", work_tree);
 646                                        continue;
 647                                }
 648                                while (pfx) {
 649                                        pfx = strchr(pfx, '/');
 650                                        if (pfx) {
 651                                                pfx++;
 652                                                printf("../");
 653                                        }
 654                                }
 655                                putchar('\n');
 656                                continue;
 657                        }
 658                        if (!strcmp(arg, "--git-dir")) {
 659                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 660                                static char cwd[PATH_MAX];
 661                                int len;
 662                                if (gitdir) {
 663                                        puts(gitdir);
 664                                        continue;
 665                                }
 666                                if (!prefix) {
 667                                        puts(".git");
 668                                        continue;
 669                                }
 670                                if (!getcwd(cwd, PATH_MAX))
 671                                        die_errno("unable to get current working directory");
 672                                len = strlen(cwd);
 673                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 674                                continue;
 675                        }
 676                        if (!strcmp(arg, "--is-inside-git-dir")) {
 677                                printf("%s\n", is_inside_git_dir() ? "true"
 678                                                : "false");
 679                                continue;
 680                        }
 681                        if (!strcmp(arg, "--is-inside-work-tree")) {
 682                                printf("%s\n", is_inside_work_tree() ? "true"
 683                                                : "false");
 684                                continue;
 685                        }
 686                        if (!strcmp(arg, "--is-bare-repository")) {
 687                                printf("%s\n", is_bare_repository() ? "true"
 688                                                : "false");
 689                                continue;
 690                        }
 691                        if (!prefixcmp(arg, "--since=")) {
 692                                show_datestring("--max-age=", arg+8);
 693                                continue;
 694                        }
 695                        if (!prefixcmp(arg, "--after=")) {
 696                                show_datestring("--max-age=", arg+8);
 697                                continue;
 698                        }
 699                        if (!prefixcmp(arg, "--before=")) {
 700                                show_datestring("--min-age=", arg+9);
 701                                continue;
 702                        }
 703                        if (!prefixcmp(arg, "--until=")) {
 704                                show_datestring("--min-age=", arg+8);
 705                                continue;
 706                        }
 707                        if (show_flag(arg) && verify)
 708                                die_no_single_rev(quiet);
 709                        continue;
 710                }
 711
 712                /* Not a flag argument */
 713                if (try_difference(arg))
 714                        continue;
 715                if (try_parent_shorthands(arg))
 716                        continue;
 717                name = arg;
 718                type = NORMAL;
 719                if (*arg == '^') {
 720                        name++;
 721                        type = REVERSED;
 722                }
 723                if (!get_sha1(name, sha1)) {
 724                        if (verify)
 725                                revs_count++;
 726                        else
 727                                show_rev(type, sha1, name);
 728                        continue;
 729                }
 730                if (verify)
 731                        die_no_single_rev(quiet);
 732                as_is = 1;
 733                if (!show_file(arg))
 734                        continue;
 735                verify_filename(prefix, arg);
 736        }
 737        if (verify) {
 738                if (revs_count == 1) {
 739                        show_rev(type, sha1, name);
 740                        return 0;
 741                } else if (revs_count == 0 && show_default())
 742                        return 0;
 743                die_no_single_rev(quiet);
 744        } else
 745                show_default();
 746        return 0;
 747}