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