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