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 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        static const char head_by_default[] = "HEAD";
 228
 229        if (!(dotdot = strstr(arg, "..")))
 230                return 0;
 231        next = dotdot + 2;
 232        this = arg;
 233        symmetric = (*next == '.');
 234
 235        *dotdot = 0;
 236        next += symmetric;
 237
 238        if (!*next)
 239                next = head_by_default;
 240        if (dotdot == arg)
 241                this = head_by_default;
 242
 243        if (this == head_by_default && next == head_by_default &&
 244            !symmetric) {
 245                /*
 246                 * Just ".."?  That is not a range but the
 247                 * pathspec for the parent directory.
 248                 */
 249                *dotdot = '.';
 250                return 0;
 251        }
 252
 253        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 254                show_rev(NORMAL, end, next);
 255                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 256                if (symmetric) {
 257                        struct commit_list *exclude;
 258                        struct commit *a, *b;
 259                        a = lookup_commit_reference(sha1);
 260                        b = lookup_commit_reference(end);
 261                        exclude = get_merge_bases(a, b, 1);
 262                        while (exclude) {
 263                                struct commit_list *n = exclude->next;
 264                                show_rev(REVERSED,
 265                                         exclude->item->object.sha1,NULL);
 266                                free(exclude);
 267                                exclude = n;
 268                        }
 269                }
 270                return 1;
 271        }
 272        *dotdot = '.';
 273        return 0;
 274}
 275
 276static int try_parent_shorthands(const char *arg)
 277{
 278        char *dotdot;
 279        unsigned char sha1[20];
 280        struct commit *commit;
 281        struct commit_list *parents;
 282        int parents_only;
 283
 284        if ((dotdot = strstr(arg, "^!")))
 285                parents_only = 0;
 286        else if ((dotdot = strstr(arg, "^@")))
 287                parents_only = 1;
 288
 289        if (!dotdot || dotdot[2])
 290                return 0;
 291
 292        *dotdot = 0;
 293        if (get_sha1(arg, sha1))
 294                return 0;
 295
 296        if (!parents_only)
 297                show_rev(NORMAL, sha1, arg);
 298        commit = lookup_commit_reference(sha1);
 299        for (parents = commit->parents; parents; parents = parents->next)
 300                show_rev(parents_only ? NORMAL : REVERSED,
 301                                parents->item->object.sha1, arg);
 302
 303        return 1;
 304}
 305
 306static int parseopt_dump(const struct option *o, const char *arg, int unset)
 307{
 308        struct strbuf *parsed = o->value;
 309        if (unset)
 310                strbuf_addf(parsed, " --no-%s", o->long_name);
 311        else if (o->short_name)
 312                strbuf_addf(parsed, " -%c", o->short_name);
 313        else
 314                strbuf_addf(parsed, " --%s", o->long_name);
 315        if (arg) {
 316                strbuf_addch(parsed, ' ');
 317                sq_quote_buf(parsed, arg);
 318        }
 319        return 0;
 320}
 321
 322static const char *skipspaces(const char *s)
 323{
 324        while (isspace(*s))
 325                s++;
 326        return s;
 327}
 328
 329static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 330{
 331        static int keep_dashdash = 0, stop_at_non_option = 0;
 332        static char const * const parseopt_usage[] = {
 333                "git rev-parse --parseopt [options] -- [<args>...]",
 334                NULL
 335        };
 336        static struct option parseopt_opts[] = {
 337                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 338                                        "keep the `--` passed as an arg"),
 339                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 340                                        "stop parsing after the "
 341                                        "first non-option argument"),
 342                OPT_END(),
 343        };
 344
 345        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 346        const char **usage = NULL;
 347        struct option *opts = NULL;
 348        int onb = 0, osz = 0, unb = 0, usz = 0;
 349
 350        strbuf_addstr(&parsed, "set --");
 351        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 352                             PARSE_OPT_KEEP_DASHDASH);
 353        if (argc < 1 || strcmp(argv[0], "--"))
 354                usage_with_options(parseopt_usage, parseopt_opts);
 355
 356        /* get the usage up to the first line with a -- on it */
 357        for (;;) {
 358                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 359                        die("premature end of input");
 360                ALLOC_GROW(usage, unb + 1, usz);
 361                if (!strcmp("--", sb.buf)) {
 362                        if (unb < 1)
 363                                die("no usage string given before the `--' separator");
 364                        usage[unb] = NULL;
 365                        break;
 366                }
 367                usage[unb++] = strbuf_detach(&sb, NULL);
 368        }
 369
 370        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 371        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 372                const char *s;
 373                struct option *o;
 374
 375                if (!sb.len)
 376                        continue;
 377
 378                ALLOC_GROW(opts, onb + 1, osz);
 379                memset(opts + onb, 0, sizeof(opts[onb]));
 380
 381                o = &opts[onb++];
 382                s = strchr(sb.buf, ' ');
 383                if (!s || *sb.buf == ' ') {
 384                        o->type = OPTION_GROUP;
 385                        o->help = xstrdup(skipspaces(sb.buf));
 386                        continue;
 387                }
 388
 389                o->type = OPTION_CALLBACK;
 390                o->help = xstrdup(skipspaces(s));
 391                o->value = &parsed;
 392                o->flags = PARSE_OPT_NOARG;
 393                o->callback = &parseopt_dump;
 394                while (s > sb.buf && strchr("*=?!", s[-1])) {
 395                        switch (*--s) {
 396                        case '=':
 397                                o->flags &= ~PARSE_OPT_NOARG;
 398                                break;
 399                        case '?':
 400                                o->flags &= ~PARSE_OPT_NOARG;
 401                                o->flags |= PARSE_OPT_OPTARG;
 402                                break;
 403                        case '!':
 404                                o->flags |= PARSE_OPT_NONEG;
 405                                break;
 406                        case '*':
 407                                o->flags |= PARSE_OPT_HIDDEN;
 408                                break;
 409                        }
 410                }
 411
 412                if (s - sb.buf == 1) /* short option only */
 413                        o->short_name = *sb.buf;
 414                else if (sb.buf[1] != ',') /* long option only */
 415                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 416                else {
 417                        o->short_name = *sb.buf;
 418                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 419                }
 420        }
 421        strbuf_release(&sb);
 422
 423        /* put an OPT_END() */
 424        ALLOC_GROW(opts, onb + 1, osz);
 425        memset(opts + onb, 0, sizeof(opts[onb]));
 426        argc = parse_options(argc, argv, prefix, opts, usage,
 427                        (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 428                        (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 429                        PARSE_OPT_SHELL_EVAL);
 430
 431        strbuf_addf(&parsed, " --");
 432        sq_quote_argv(&parsed, argv, 0);
 433        puts(parsed.buf);
 434        return 0;
 435}
 436
 437static int cmd_sq_quote(int argc, const char **argv)
 438{
 439        struct strbuf buf = STRBUF_INIT;
 440
 441        if (argc)
 442                sq_quote_argv(&buf, argv, 0);
 443        printf("%s\n", buf.buf);
 444        strbuf_release(&buf);
 445
 446        return 0;
 447}
 448
 449static void die_no_single_rev(int quiet)
 450{
 451        if (quiet)
 452                exit(1);
 453        else
 454                die("Needed a single revision");
 455}
 456
 457static const char builtin_rev_parse_usage[] =
 458"git rev-parse --parseopt [options] -- [<args>...]\n"
 459"   or: git rev-parse --sq-quote [<arg>...]\n"
 460"   or: git rev-parse [options] [<arg>...]\n"
 461"\n"
 462"Run \"git rev-parse --parseopt -h\" for more information on the first usage.";
 463
 464int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 465{
 466        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 467        unsigned char sha1[20];
 468        const char *name = NULL;
 469
 470        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 471                return cmd_parseopt(argc - 1, argv + 1, prefix);
 472
 473        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 474                return cmd_sq_quote(argc - 2, argv + 2);
 475
 476        if (argc == 2 && !strcmp("--local-env-vars", argv[1])) {
 477                int i;
 478                for (i = 0; local_repo_env[i]; i++)
 479                        printf("%s\n", local_repo_env[i]);
 480                return 0;
 481        }
 482
 483        if (argc > 2 && !strcmp(argv[1], "--resolve-git-dir")) {
 484                const char *gitdir = resolve_gitdir(argv[2]);
 485                if (!gitdir)
 486                        die("not a gitdir '%s'", argv[2]);
 487                puts(gitdir);
 488                return 0;
 489        }
 490
 491        if (argc > 1 && !strcmp("-h", argv[1]))
 492                usage(builtin_rev_parse_usage);
 493
 494        prefix = setup_git_directory();
 495        git_config(git_default_config, NULL);
 496        for (i = 1; i < argc; i++) {
 497                const char *arg = argv[i];
 498
 499                if (as_is) {
 500                        if (show_file(arg) && as_is < 2)
 501                                verify_filename(prefix, arg, 0);
 502                        continue;
 503                }
 504                if (!strcmp(arg,"-n")) {
 505                        if (++i >= argc)
 506                                die("-n requires an argument");
 507                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 508                                show(arg);
 509                                show(argv[i]);
 510                        }
 511                        continue;
 512                }
 513                if (!prefixcmp(arg, "-n")) {
 514                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 515                                show(arg);
 516                        continue;
 517                }
 518
 519                if (*arg == '-') {
 520                        if (!strcmp(arg, "--")) {
 521                                as_is = 2;
 522                                /* Pass on the "--" if we show anything but files.. */
 523                                if (filter & (DO_FLAGS | DO_REVS))
 524                                        show_file(arg);
 525                                continue;
 526                        }
 527                        if (!strcmp(arg, "--default")) {
 528                                def = argv[i+1];
 529                                i++;
 530                                continue;
 531                        }
 532                        if (!strcmp(arg, "--revs-only")) {
 533                                filter &= ~DO_NOREV;
 534                                continue;
 535                        }
 536                        if (!strcmp(arg, "--no-revs")) {
 537                                filter &= ~DO_REVS;
 538                                continue;
 539                        }
 540                        if (!strcmp(arg, "--flags")) {
 541                                filter &= ~DO_NONFLAGS;
 542                                continue;
 543                        }
 544                        if (!strcmp(arg, "--no-flags")) {
 545                                filter &= ~DO_FLAGS;
 546                                continue;
 547                        }
 548                        if (!strcmp(arg, "--verify")) {
 549                                filter &= ~(DO_FLAGS|DO_NOREV);
 550                                verify = 1;
 551                                continue;
 552                        }
 553                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 554                                quiet = 1;
 555                                continue;
 556                        }
 557                        if (!strcmp(arg, "--short") ||
 558                            !prefixcmp(arg, "--short=")) {
 559                                filter &= ~(DO_FLAGS|DO_NOREV);
 560                                verify = 1;
 561                                abbrev = DEFAULT_ABBREV;
 562                                if (arg[7] == '=')
 563                                        abbrev = strtoul(arg + 8, NULL, 10);
 564                                if (abbrev < MINIMUM_ABBREV)
 565                                        abbrev = MINIMUM_ABBREV;
 566                                else if (40 <= abbrev)
 567                                        abbrev = 40;
 568                                continue;
 569                        }
 570                        if (!strcmp(arg, "--sq")) {
 571                                output_sq = 1;
 572                                continue;
 573                        }
 574                        if (!strcmp(arg, "--not")) {
 575                                show_type ^= REVERSED;
 576                                continue;
 577                        }
 578                        if (!strcmp(arg, "--symbolic")) {
 579                                symbolic = SHOW_SYMBOLIC_ASIS;
 580                                continue;
 581                        }
 582                        if (!strcmp(arg, "--symbolic-full-name")) {
 583                                symbolic = SHOW_SYMBOLIC_FULL;
 584                                continue;
 585                        }
 586                        if (!prefixcmp(arg, "--abbrev-ref") &&
 587                            (!arg[12] || arg[12] == '=')) {
 588                                abbrev_ref = 1;
 589                                abbrev_ref_strict = warn_ambiguous_refs;
 590                                if (arg[12] == '=') {
 591                                        if (!strcmp(arg + 13, "strict"))
 592                                                abbrev_ref_strict = 1;
 593                                        else if (!strcmp(arg + 13, "loose"))
 594                                                abbrev_ref_strict = 0;
 595                                        else
 596                                                die("unknown mode for %s", arg);
 597                                }
 598                                continue;
 599                        }
 600                        if (!strcmp(arg, "--all")) {
 601                                for_each_ref(show_reference, NULL);
 602                                continue;
 603                        }
 604                        if (!strcmp(arg, "--bisect")) {
 605                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 606                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 607                                continue;
 608                        }
 609                        if (!prefixcmp(arg, "--branches=")) {
 610                                for_each_glob_ref_in(show_reference, arg + 11,
 611                                        "refs/heads/", NULL);
 612                                continue;
 613                        }
 614                        if (!strcmp(arg, "--branches")) {
 615                                for_each_branch_ref(show_reference, NULL);
 616                                continue;
 617                        }
 618                        if (!prefixcmp(arg, "--tags=")) {
 619                                for_each_glob_ref_in(show_reference, arg + 7,
 620                                        "refs/tags/", NULL);
 621                                continue;
 622                        }
 623                        if (!strcmp(arg, "--tags")) {
 624                                for_each_tag_ref(show_reference, NULL);
 625                                continue;
 626                        }
 627                        if (!prefixcmp(arg, "--glob=")) {
 628                                for_each_glob_ref(show_reference, arg + 7, NULL);
 629                                continue;
 630                        }
 631                        if (!prefixcmp(arg, "--remotes=")) {
 632                                for_each_glob_ref_in(show_reference, arg + 10,
 633                                        "refs/remotes/", NULL);
 634                                continue;
 635                        }
 636                        if (!strcmp(arg, "--remotes")) {
 637                                for_each_remote_ref(show_reference, NULL);
 638                                continue;
 639                        }
 640                        if (!strcmp(arg, "--show-toplevel")) {
 641                                const char *work_tree = get_git_work_tree();
 642                                if (work_tree)
 643                                        puts(work_tree);
 644                                continue;
 645                        }
 646                        if (!strcmp(arg, "--show-prefix")) {
 647                                if (prefix)
 648                                        puts(prefix);
 649                                else
 650                                        putchar('\n');
 651                                continue;
 652                        }
 653                        if (!strcmp(arg, "--show-cdup")) {
 654                                const char *pfx = prefix;
 655                                if (!is_inside_work_tree()) {
 656                                        const char *work_tree =
 657                                                get_git_work_tree();
 658                                        if (work_tree)
 659                                                printf("%s\n", work_tree);
 660                                        continue;
 661                                }
 662                                while (pfx) {
 663                                        pfx = strchr(pfx, '/');
 664                                        if (pfx) {
 665                                                pfx++;
 666                                                printf("../");
 667                                        }
 668                                }
 669                                putchar('\n');
 670                                continue;
 671                        }
 672                        if (!strcmp(arg, "--git-dir")) {
 673                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 674                                static char cwd[PATH_MAX];
 675                                int len;
 676                                if (gitdir) {
 677                                        puts(gitdir);
 678                                        continue;
 679                                }
 680                                if (!prefix) {
 681                                        puts(".git");
 682                                        continue;
 683                                }
 684                                if (!getcwd(cwd, PATH_MAX))
 685                                        die_errno("unable to get current working directory");
 686                                len = strlen(cwd);
 687                                printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 688                                continue;
 689                        }
 690                        if (!strcmp(arg, "--is-inside-git-dir")) {
 691                                printf("%s\n", is_inside_git_dir() ? "true"
 692                                                : "false");
 693                                continue;
 694                        }
 695                        if (!strcmp(arg, "--is-inside-work-tree")) {
 696                                printf("%s\n", is_inside_work_tree() ? "true"
 697                                                : "false");
 698                                continue;
 699                        }
 700                        if (!strcmp(arg, "--is-bare-repository")) {
 701                                printf("%s\n", is_bare_repository() ? "true"
 702                                                : "false");
 703                                continue;
 704                        }
 705                        if (!prefixcmp(arg, "--since=")) {
 706                                show_datestring("--max-age=", arg+8);
 707                                continue;
 708                        }
 709                        if (!prefixcmp(arg, "--after=")) {
 710                                show_datestring("--max-age=", arg+8);
 711                                continue;
 712                        }
 713                        if (!prefixcmp(arg, "--before=")) {
 714                                show_datestring("--min-age=", arg+9);
 715                                continue;
 716                        }
 717                        if (!prefixcmp(arg, "--until=")) {
 718                                show_datestring("--min-age=", arg+8);
 719                                continue;
 720                        }
 721                        if (show_flag(arg) && verify)
 722                                die_no_single_rev(quiet);
 723                        continue;
 724                }
 725
 726                /* Not a flag argument */
 727                if (try_difference(arg))
 728                        continue;
 729                if (try_parent_shorthands(arg))
 730                        continue;
 731                name = arg;
 732                type = NORMAL;
 733                if (*arg == '^') {
 734                        name++;
 735                        type = REVERSED;
 736                }
 737                if (!get_sha1(name, sha1)) {
 738                        if (verify)
 739                                revs_count++;
 740                        else
 741                                show_rev(type, sha1, name);
 742                        continue;
 743                }
 744                if (verify)
 745                        die_no_single_rev(quiet);
 746                as_is = 1;
 747                if (!show_file(arg))
 748                        continue;
 749                verify_filename(prefix, arg, 1);
 750        }
 751        if (verify) {
 752                if (revs_count == 1) {
 753                        show_rev(type, sha1, name);
 754                        return 0;
 755                } else if (revs_count == 0 && show_default())
 756                        return 0;
 757                die_no_single_rev(quiet);
 758        } else
 759                show_default();
 760        return 0;
 761}