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