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
 234        if (!(dotdot = strstr(arg, "..")))
 235                return 0;
 236        next = dotdot + 2;
 237        this = arg;
 238        symmetric = (*next == '.');
 239
 240        *dotdot = 0;
 241        next += symmetric;
 242
 243        if (!*next)
 244                next = "HEAD";
 245        if (dotdot == arg)
 246                this = "HEAD";
 247        if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 248                show_rev(NORMAL, end, next);
 249                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 250                if (symmetric) {
 251                        struct commit_list *exclude;
 252                        struct commit *a, *b;
 253                        a = lookup_commit_reference(sha1);
 254                        b = lookup_commit_reference(end);
 255                        exclude = get_merge_bases(a, b, 1);
 256                        while (exclude) {
 257                                struct commit_list *n = exclude->next;
 258                                show_rev(REVERSED,
 259                                         exclude->item->object.sha1,NULL);
 260                                free(exclude);
 261                                exclude = n;
 262                        }
 263                }
 264                return 1;
 265        }
 266        *dotdot = '.';
 267        return 0;
 268}
 269
 270static int try_parent_shorthands(const char *arg)
 271{
 272        char *dotdot;
 273        unsigned char sha1[20];
 274        struct commit *commit;
 275        struct commit_list *parents;
 276        int parents_only;
 277
 278        if ((dotdot = strstr(arg, "^!")))
 279                parents_only = 0;
 280        else if ((dotdot = strstr(arg, "^@")))
 281                parents_only = 1;
 282
 283        if (!dotdot || dotdot[2])
 284                return 0;
 285
 286        *dotdot = 0;
 287        if (get_sha1_committish(arg, sha1))
 288                return 0;
 289
 290        if (!parents_only)
 291                show_rev(NORMAL, sha1, arg);
 292        commit = lookup_commit_reference(sha1);
 293        for (parents = commit->parents; parents; parents = parents->next)
 294                show_rev(parents_only ? NORMAL : REVERSED,
 295                                parents->item->object.sha1, arg);
 296
 297        return 1;
 298}
 299
 300static int parseopt_dump(const struct option *o, const char *arg, int unset)
 301{
 302        struct strbuf *parsed = o->value;
 303        if (unset)
 304                strbuf_addf(parsed, " --no-%s", o->long_name);
 305        else if (o->short_name)
 306                strbuf_addf(parsed, " -%c", o->short_name);
 307        else
 308                strbuf_addf(parsed, " --%s", o->long_name);
 309        if (arg) {
 310                strbuf_addch(parsed, ' ');
 311                sq_quote_buf(parsed, arg);
 312        }
 313        return 0;
 314}
 315
 316static const char *skipspaces(const char *s)
 317{
 318        while (isspace(*s))
 319                s++;
 320        return s;
 321}
 322
 323static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 324{
 325        static int keep_dashdash = 0, stop_at_non_option = 0;
 326        static char const * const parseopt_usage[] = {
 327                "git rev-parse --parseopt [options] -- [<args>...]",
 328                NULL
 329        };
 330        static struct option parseopt_opts[] = {
 331                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 332                                        "keep the `--` passed as an arg"),
 333                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 334                                        "stop parsing after the "
 335                                        "first non-option argument"),
 336                OPT_END(),
 337        };
 338
 339        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 340        const char **usage = NULL;
 341        struct option *opts = NULL;
 342        int onb = 0, osz = 0, unb = 0, usz = 0;
 343
 344        strbuf_addstr(&parsed, "set --");
 345        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 346                             PARSE_OPT_KEEP_DASHDASH);
 347        if (argc < 1 || strcmp(argv[0], "--"))
 348                usage_with_options(parseopt_usage, parseopt_opts);
 349
 350        /* get the usage up to the first line with a -- on it */
 351        for (;;) {
 352                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 353                        die("premature end of input");
 354                ALLOC_GROW(usage, unb + 1, usz);
 355                if (!strcmp("--", sb.buf)) {
 356                        if (unb < 1)
 357                                die("no usage string given before the `--' separator");
 358                        usage[unb] = NULL;
 359                        break;
 360                }
 361                usage[unb++] = strbuf_detach(&sb, NULL);
 362        }
 363
 364        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 365        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 366                const char *s;
 367                struct option *o;
 368
 369                if (!sb.len)
 370                        continue;
 371
 372                ALLOC_GROW(opts, onb + 1, osz);
 373                memset(opts + onb, 0, sizeof(opts[onb]));
 374
 375                o = &opts[onb++];
 376                s = strchr(sb.buf, ' ');
 377                if (!s || *sb.buf == ' ') {
 378                        o->type = OPTION_GROUP;
 379                        o->help = xstrdup(skipspaces(sb.buf));
 380                        continue;
 381                }
 382
 383                o->type = OPTION_CALLBACK;
 384                o->help = xstrdup(skipspaces(s));
 385                o->value = &parsed;
 386                o->flags = PARSE_OPT_NOARG;
 387                o->callback = &parseopt_dump;
 388                while (s > sb.buf && strchr("*=?!", s[-1])) {
 389                        switch (*--s) {
 390                        case '=':
 391                                o->flags &= ~PARSE_OPT_NOARG;
 392                                break;
 393                        case '?':
 394                                o->flags &= ~PARSE_OPT_NOARG;
 395                                o->flags |= PARSE_OPT_OPTARG;
 396                                break;
 397                        case '!':
 398                                o->flags |= PARSE_OPT_NONEG;
 399                                break;
 400                        case '*':
 401                                o->flags |= PARSE_OPT_HIDDEN;
 402                                break;
 403                        }
 404                }
 405
 406                if (s - sb.buf == 1) /* short option only */
 407                        o->short_name = *sb.buf;
 408                else if (sb.buf[1] != ',') /* long option only */
 409                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 410                else {
 411                        o->short_name = *sb.buf;
 412                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 413                }
 414        }
 415        strbuf_release(&sb);
 416
 417        /* put an OPT_END() */
 418        ALLOC_GROW(opts, onb + 1, osz);
 419        memset(opts + onb, 0, sizeof(opts[onb]));
 420        argc = parse_options(argc, argv, prefix, opts, usage,
 421                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 422                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 423                        PARSE_OPT_SHELL_EVAL);
 424
 425        strbuf_addf(&parsed, " --");
 426        sq_quote_argv(&parsed, argv, 0);
 427        puts(parsed.buf);
 428        return 0;
 429}
 430
 431static int cmd_sq_quote(int argc, const char **argv)
 432{
 433        struct strbuf buf = STRBUF_INIT;
 434
 435        if (argc)
 436                sq_quote_argv(&buf, argv, 0);
 437        printf("%s\n", buf.buf);
 438        strbuf_release(&buf);
 439
 440        return 0;
 441}
 442
 443static void die_no_single_rev(int quiet)
 444{
 445        if (quiet)
 446                exit(1);
 447        else
 448                die("Needed a single revision");
 449}
 450
 451static const char builtin_rev_parse_usage[] =
 452"git rev-parse --parseopt [options] -- [<args>...]\n"
 453"   or: git rev-parse --sq-quote [<arg>...]\n"
 454"   or: git rev-parse [options] [<arg>...]\n"
 455"\n"
 456"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 457
 458int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 459{
 460        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 461        unsigned char sha1[20];
 462        const char *name = NULL;
 463
 464        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 465                return cmd_parseopt(argc - 1, argv + 1, prefix);
 466
 467        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 468                return cmd_sq_quote(argc - 2, argv + 2);
 469
 470        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 471                int i;
 472                for (i = 0; local_repo_env[i]; i++)
 473                        printf("%s\n", local_repo_env[i]);
 474                return 0;
 475        }
 476
 477        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 478                const char *gitdir = resolve_gitdir(argv[2]);
 479                if (!gitdir)
 480                        die("not a gitdir '%s'", argv[2]);
 481                puts(gitdir);
 482                return 0;
 483        }
 484
 485        if (argc > 1 && !strcmp("-h", argv[1]))
 486                usage(builtin_rev_parse_usage);
 487
 488        prefix = setup_git_directory();
 489        git_config(git_default_config, NULL);
 490        for (i = 1; i < argc; i++) {
 491                const char *arg = argv[i];
 492
 493                if (as_is) {
 494                        if (show_file(arg) && as_is < 2)
 495                                verify_filename(prefix, arg, 0);
 496                        continue;
 497                }
 498                if (!strcmp(arg,"-n")) {
 499                        if (++i >= argc)
 500                                die("-n requires an argument");
 501                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 502                                show(arg);
 503                                show(argv[i]);
 504                        }
 505                        continue;
 506                }
 507                if (!prefixcmp(arg, "-n")) {
 508                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 509                                show(arg);
 510                        continue;
 511                }
 512
 513                if (*arg == '-') {
 514                        if (!strcmp(arg, "--")) {
 515                                as_is = 2;
 516                                /* Pass on the "--" if we show anything but files.. */
 517                                if (filter & (DO_FLAGS | DO_REVS))
 518                                        show_file(arg);
 519                                continue;
 520                        }
 521                        if (!strcmp(arg, "--default")) {
 522                                def = argv[i+1];
 523                                i++;
 524                                continue;
 525                        }
 526                        if (!strcmp(arg, "--revs-only")) {
 527                                filter &= ~DO_NOREV;
 528                                continue;
 529                        }
 530                        if (!strcmp(arg, "--no-revs")) {
 531                                filter &= ~DO_REVS;
 532                                continue;
 533                        }
 534                        if (!strcmp(arg, "--flags")) {
 535                                filter &= ~DO_NONFLAGS;
 536                                continue;
 537                        }
 538                        if (!strcmp(arg, "--no-flags")) {
 539                                filter &= ~DO_FLAGS;
 540                                continue;
 541                        }
 542                        if (!strcmp(arg, "--verify")) {
 543                                filter &= ~(DO_FLAGS|DO_NOREV);
 544                                verify = 1;
 545                                continue;
 546                        }
 547                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 548                                quiet = 1;
 549                                continue;
 550                        }
 551                        if (!strcmp(arg, "--short") ||
 552                            !prefixcmp(arg, "--short=")) {
 553                                filter &= ~(DO_FLAGS|DO_NOREV);
 554                                verify = 1;
 555                                abbrev = DEFAULT_ABBREV;
 556                                if (arg[7] == '=')
 557                                        abbrev = strtoul(arg + 8, NULL, 10);
 558                                if (abbrev < MINIMUM_ABBREV)
 559                                        abbrev = MINIMUM_ABBREV;
 560                                else if (40 <= abbrev)
 561                                        abbrev = 40;
 562                                continue;
 563                        }
 564                        if (!strcmp(arg, "--sq")) {
 565                                output_sq = 1;
 566                                continue;
 567                        }
 568                        if (!strcmp(arg, "--not")) {
 569                                show_type ^= REVERSED;
 570                                continue;
 571                        }
 572                        if (!strcmp(arg, "--symbolic")) {
 573                                symbolic = SHOW_SYMBOLIC_ASIS;
 574                                continue;
 575                        }
 576                        if (!strcmp(arg, "--symbolic-full-name")) {
 577                                symbolic = SHOW_SYMBOLIC_FULL;
 578                                continue;
 579                        }
 580                        if (!prefixcmp(arg, "--abbrev-ref") &&
 581                            (!arg[12] || arg[12] == '=')) {
 582                                abbrev_ref = 1;
 583                                abbrev_ref_strict = warn_ambiguous_refs;
 584                                if (arg[12] == '=') {
 585                                        if (!strcmp(arg + 13, "strict"))
 586                                                abbrev_ref_strict = 1;
 587                                        else if (!strcmp(arg + 13, "loose"))
 588                                                abbrev_ref_strict = 0;
 589                                        else
 590                                                die("unknown mode for %s", arg);
 591                                }
 592                                continue;
 593                        }
 594                        if (!strcmp(arg, "--all")) {
 595                                for_each_ref(show_reference, NULL);
 596                                continue;
 597                        }
 598                        if (!prefixcmp(arg, "--disambiguate=")) {
 599                                for_each_abbrev(arg + 15, show_abbrev, NULL);
 600                                continue;
 601                        }
 602                        if (!strcmp(arg, "--bisect")) {
 603                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 604                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 605                                continue;
 606                        }
 607                        if (!prefixcmp(arg, "--branches=")) {
 608                                for_each_glob_ref_in(show_reference, arg + 11,
 609                                        "refs/heads/", NULL);
 610                                continue;
 611                        }
 612                        if (!strcmp(arg, "--branches")) {
 613                                for_each_branch_ref(show_reference, NULL);
 614                                continue;
 615                        }
 616                        if (!prefixcmp(arg, "--tags=")) {
 617                                for_each_glob_ref_in(show_reference, arg + 7,
 618                                        "refs/tags/", NULL);
 619                                continue;
 620                        }
 621                        if (!strcmp(arg, "--tags")) {
 622                                for_each_tag_ref(show_reference, NULL);
 623                                continue;
 624                        }
 625                        if (!prefixcmp(arg, "--glob=")) {
 626                                for_each_glob_ref(show_reference, arg + 7, NULL);
 627                                continue;
 628                        }
 629                        if (!prefixcmp(arg, "--remotes=")) {
 630                                for_each_glob_ref_in(show_reference, arg + 10,
 631                                        "refs/remotes/", NULL);
 632                                continue;
 633                        }
 634                        if (!strcmp(arg, "--remotes")) {
 635                                for_each_remote_ref(show_reference, NULL);
 636                                continue;
 637                        }
 638                        if (!strcmp(arg, "--show-toplevel")) {
 639                                const char *work_tree = get_git_work_tree();
 640                                if (work_tree)
 641                                        puts(work_tree);
 642                                continue;
 643                        }
 644                        if (!strcmp(arg, "--show-prefix")) {
 645                                if (prefix)
 646                                        puts(prefix);
 647                                else
 648                                        putchar('\n');
 649                                continue;
 650                        }
 651                        if (!strcmp(arg, "--show-cdup")) {
 652                                const char *pfx = prefix;
 653                                if (!is_inside_work_tree()) {
 654                                        const char *work_tree =
 655                                                get_git_work_tree();
 656                                        if (work_tree)
 657                                                printf("%s\n", work_tree);
 658                                        continue;
 659                                }
 660                                while (pfx) {
 661                                        pfx = strchr(pfx, '/');
 662                                        if (pfx) {
 663                                                pfx++;
 664                                                printf("../");
 665                                        }
 666                                }
 667                                putchar('\n');
 668                                continue;
 669                        }
 670                        if (!strcmp(arg, "--git-dir")) {
 671                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 672                                static char cwd[PATH_MAX];
 673                                int len;
 674                                if (gitdir) {
 675                                        puts(gitdir);
 676                                        continue;
 677                                }
 678                                if (!prefix) {
 679                                        puts(".git");
 680                                        continue;
 681                                }
 682                                if (!getcwd(cwd, PATH_MAX))
 683                                        die_errno("unable to get current working directory");
 684                                len = strlen(cwd);
 685                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 686                                continue;
 687                        }
 688                        if (!strcmp(arg, "--is-inside-git-dir")) {
 689                                printf("%s\n", is_inside_git_dir() ? "true"
 690                                                : "false");
 691                                continue;
 692                        }
 693                        if (!strcmp(arg, "--is-inside-work-tree")) {
 694                                printf("%s\n", is_inside_work_tree() ? "true"
 695                                                : "false");
 696                                continue;
 697                        }
 698                        if (!strcmp(arg, "--is-bare-repository")) {
 699                                printf("%s\n", is_bare_repository() ? "true"
 700                                                : "false");
 701                                continue;
 702                        }
 703                        if (!prefixcmp(arg, "--since=")) {
 704                                show_datestring("--max-age=", arg+8);
 705                                continue;
 706                        }
 707                        if (!prefixcmp(arg, "--after=")) {
 708                                show_datestring("--max-age=", arg+8);
 709                                continue;
 710                        }
 711                        if (!prefixcmp(arg, "--before=")) {
 712                                show_datestring("--min-age=", arg+9);
 713                                continue;
 714                        }
 715                        if (!prefixcmp(arg, "--until=")) {
 716                                show_datestring("--min-age=", arg+8);
 717                                continue;
 718                        }
 719                        if (show_flag(arg) && verify)
 720                                die_no_single_rev(quiet);
 721                        continue;
 722                }
 723
 724                /* Not a flag argument */
 725                if (try_difference(arg))
 726                        continue;
 727                if (try_parent_shorthands(arg))
 728                        continue;
 729                name = arg;
 730                type = NORMAL;
 731                if (*arg == '^') {
 732                        name++;
 733                        type = REVERSED;
 734                }
 735                if (!get_sha1(name, sha1)) {
 736                        if (verify)
 737                                revs_count++;
 738                        else
 739                                show_rev(type, sha1, name);
 740                        continue;
 741                }
 742                if (verify)
 743                        die_no_single_rev(quiet);
 744                as_is = 1;
 745                if (!show_file(arg))
 746                        continue;
 747                verify_filename(prefix, arg, 1);
 748        }
 749        if (verify) {
 750                if (revs_count == 1) {
 751                        show_rev(type, sha1, name);
 752                        return 0;
 753                } else if (revs_count == 0 && show_default())
 754                        return 0;
 755                die_no_single_rev(quiet);
 756        } else
 757                show_default();
 758        return 0;
 759}