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 static int stuck_long;
  34
  35 /*
  36  * Some arguments are relevant "revision" arguments,
  37  * others are about output format or other details.
  38  * This sorts it all out.
  39  */
  40 static int is_rev_argument(const char *arg)
  41 {
  42         static const char *rev_args[] = {
  43                 "--all",
  44                 "--bisect",
  45                 "--dense",
  46                 "--branches=",
  47                 "--branches",
  48                 "--header",
  49                 "--ignore-missing",
  50                 "--max-age=",
  51                 "--max-count=",
  52                 "--min-age=",
  53                 "--no-merges",
  54                 "--min-parents=",
  55                 "--no-min-parents",
  56                 "--max-parents=",
  57                 "--no-max-parents",
  58                 "--objects",
  59                 "--objects-edge",
  60                 "--parents",
  61                 "--pretty",
  62                 "--remotes=",
  63                 "--remotes",
  64                 "--glob=",
  65                 "--sparse",
  66                 "--tags=",
  67                 "--tags",
  68                 "--topo-order",
  69                 "--date-order",
  70                 "--unpacked",
  71                 NULL
  72         };
  73         const char **p = rev_args;
  74
  75         /* accept -<digit>, like traditional "head" */
  76         if ((*arg == '-') && isdigit(arg[1]))
  77                 return 1;
  78
  79         for (;;) {
  80                 const char *str = *p++;
  81                 int len;
  82                 if (!str)
  83                         return 0;
  84                 len = strlen(str);
  85                 if (!strcmp(arg, str) ||
  86                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  87                         return 1;
  88         }
  89 }
  90
  91 /* Output argument as a string, either SQ or normal */
  92 static void show(const char *arg)
  93 {
  94         if (output_sq) {
  95                 int sq = '\'', ch;
  96
  97                 putchar(sq);
  98                 while ((ch = *arg++)) {
  99                         if (ch == sq)
 100                                 fputs("'\\'", stdout);
 101                         putchar(ch);
 102                 }
 103                 putchar(sq);
 104                 putchar(' ');
 105         }
 106         else
 107                 puts(arg);
 108 }
 109
 110 /* Like show(), but with a negation prefix according to type */
 111 static void show_with_type(int type, const char *arg)
 112 {
 113         if (type != show_type)
 114                 putchar('^');
 115         show(arg);
 116 }
 117
 118 /* Output a revision, only if filter allows it */
 119 static void show_rev(int type, const unsigned char *sha1, const char *name)
 120 {
 121         if (!(filter & DO_REVS))
 122                 return;
 123         def = NULL;
 124
 125         if ((symbolic || abbrev_ref) && name) {
 126                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 127                         unsigned char discard[20];
 128                         char *full;
 129
 130                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 131                         case 0:
 132                                 /*
 133                                  * Not found -- not a ref.  We could
 134                                  * emit "name" here, but symbolic-full
 135                                  * users are interested in finding the
 136                                  * refs spelled in full, and they would
 137                                  * need to filter non-refs if we did so.
 138                                  */
 139                                 break;
 140                         case 1: /* happy */
 141                                 if (abbrev_ref)
 142                                         full = shorten_unambiguous_ref(full,
 143                                                 abbrev_ref_strict);
 144                                 show_with_type(type, full);
 145                                 break;
 146                         default: /* ambiguous */
 147                                 error("refname '%s' is ambiguous", name);
 148                                 break;
 149                         }
 150                 } else {
 151                         show_with_type(type, name);
 152                 }
 153         }
 154         else if (abbrev)
 155                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 156         else
 157                 show_with_type(type, sha1_to_hex(sha1));
 158 }
 159
 160 /* Output a flag, only if filter allows it. */
 161 static int show_flag(const char *arg)
 162 {
 163         if (!(filter & DO_FLAGS))
 164                 return 0;
 165         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 166                 show(arg);
 167                 return 1;
 168         }
 169         return 0;
 170 }
 171
 172 static int show_default(void)
 173 {
 174         const char *s = def;
 175
 176         if (s) {
 177                 unsigned char sha1[20];
 178
 179                 def = NULL;
 180                 if (!get_sha1(s, sha1)) {
 181                         show_rev(NORMAL, sha1, s);
 182                         return 1;
 183                 }
 184         }
 185         return 0;
 186 }
 187
 188 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 189 {
 190         show_rev(NORMAL, sha1, refname);
 191         return 0;
 192 }
 193
 194 static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 195 {
 196         show_rev(REVERSED, sha1, refname);
 197         return 0;
 198 }
 199
 200 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 201 {
 202         show_rev(NORMAL, sha1, NULL);
 203         return 0;
 204 }
 205
 206 static void show_datestring(const char *flag, const char *datestr)
 207 {
 208         static char buffer[100];
 209
 210         /* date handling requires both flags and revs */
 211         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 212                 return;
 213         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 214         show(buffer);
 215 }
 216
 217 static int show_file(const char *arg, int output_prefix)
 218 {
 219         show_default();
 220         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 221                 if (output_prefix) {
 222                         const char *prefix = startup_info->prefix;
 223                         show(prefix_filename(prefix,
 224                                              prefix ? strlen(prefix) : 0,
 225                                              arg));
 226                 } else
 227                         show(arg);
 228                 return 1;
 229         }
 230         return 0;
 231 }
 232
 233 static int try_difference(const char *arg)
 234 {
 235         char *dotdot;
 236         unsigned char sha1[20];
 237         unsigned char end[20];
 238         const char *next;
 239         const char *this;
 240         int symmetric;
 241         static const char head_by_default[] = "HEAD";
 242
 243         if (!(dotdot = strstr(arg, "..")))
 244                 return 0;
 245         next = dotdot + 2;
 246         this = arg;
 247         symmetric = (*next == '.');
 248
 249         *dotdot = 0;
 250         next += symmetric;
 251
 252         if (!*next)
 253                 next = head_by_default;
 254         if (dotdot == arg)
 255                 this = head_by_default;
 256
 257         if (this == head_by_default && next == head_by_default &&
 258             !symmetric) {
 259                 /*
 260                  * Just ".."?  That is not a range but the
 261                  * pathspec for the parent directory.
 262                  */
 263                 *dotdot = '.';
 264                 return 0;
 265         }
 266
 267         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 268                 show_rev(NORMAL, end, next);
 269                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 270                 if (symmetric) {
 271                         struct commit_list *exclude;
 272                         struct commit *a, *b;
 273                         a = lookup_commit_reference(sha1);
 274                         b = lookup_commit_reference(end);
 275                         exclude = get_merge_bases(a, b, 1);
 276                         while (exclude) {
 277                                 struct commit_list *n = exclude->next;
 278                                 show_rev(REVERSED,
 279                                          exclude->item->object.sha1,NULL);
 280                                 free(exclude);
 281                                 exclude = n;
 282                         }
 283                 }
 284                 return 1;
 285         }
 286         *dotdot = '.';
 287         return 0;
 288 }
 289
 290 static int try_parent_shorthands(const char *arg)
 291 {
 292         char *dotdot;
 293         unsigned char sha1[20];
 294         struct commit *commit;
 295         struct commit_list *parents;
 296         int parents_only;
 297
 298         if ((dotdot = strstr(arg, "^!")))
 299                 parents_only = 0;
 300         else if ((dotdot = strstr(arg, "^@")))
 301                 parents_only = 1;
 302
 303         if (!dotdot || dotdot[2])
 304                 return 0;
 305
 306         *dotdot = 0;
 307         if (get_sha1_committish(arg, sha1))
 308                 return 0;
 309
 310         if (!parents_only)
 311                 show_rev(NORMAL, sha1, arg);
 312         commit = lookup_commit_reference(sha1);
 313         for (parents = commit->parents; parents; parents = parents->next)
 314                 show_rev(parents_only ? NORMAL : REVERSED,
 315                                 parents->item->object.sha1, arg);
 316
 317         return 1;
 318 }
 319
 320 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 321 {
 322         struct strbuf *parsed = o->value;
 323         if (unset)
 324                 strbuf_addf(parsed, " --no-%s", o->long_name);
 325         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 326                 strbuf_addf(parsed, " -%c", o->short_name);
 327         else
 328                 strbuf_addf(parsed, " --%s", o->long_name);
 329         if (arg) {
 330                 if (!stuck_long)
 331                         strbuf_addch(parsed, ' ');
 332                 else if (o->long_name)
 333                         strbuf_addch(parsed, '=');
 334                 sq_quote_buf(parsed, arg);
 335         }
 336         return 0;
 337 }
 338
 339 static const char *skipspaces(const char *s)
 340 {
 341         while (isspace(*s))
 342                 s++;
 343         return s;
 344 }
 345
 346 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 347 {
 348         static int keep_dashdash = 0, stop_at_non_option = 0;
 349         static char const * const parseopt_usage[] = {
 350                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
 351                 NULL
 352         };
 353         static struct option parseopt_opts[] = {
 354                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 355                                         N_("keep the `--` passed as an arg")),
 356                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 357                                         N_("stop parsing after the "
 358                                            "first non-option argument")),
 359                 OPT_BOOL(0, "stuck-long", &stuck_long,
 360                                         N_("output in stuck long form")),
 361                 OPT_END(),
 362         };
 363
 364         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 365         const char **usage = NULL;
 366         struct option *opts = NULL;
 367         int onb = 0, osz = 0, unb = 0, usz = 0;
 368
 369         strbuf_addstr(&parsed, "set --");
 370         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 371                              PARSE_OPT_KEEP_DASHDASH);
 372         if (argc < 1 || strcmp(argv[0], "--"))
 373                 usage_with_options(parseopt_usage, parseopt_opts);
 374
 375         /* get the usage up to the first line with a -- on it */
 376         for (;;) {
 377                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 378                         die("premature end of input");
 379                 ALLOC_GROW(usage, unb + 1, usz);
 380                 if (!strcmp("--", sb.buf)) {
 381                         if (unb < 1)
 382                                 die("no usage string given before the `--' separator");
 383                         usage[unb] = NULL;
 384                         break;
 385                 }
 386                 usage[unb++] = strbuf_detach(&sb, NULL);
 387         }
 388
 389         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 390         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 391                 const char *s;
 392                 struct option *o;
 393
 394                 if (!sb.len)
 395                         continue;
 396
 397                 ALLOC_GROW(opts, onb + 1, osz);
 398                 memset(opts + onb, 0, sizeof(opts[onb]));
 399
 400                 o = &opts[onb++];
 401                 s = strchr(sb.buf, ' ');
 402                 if (!s || *sb.buf == ' ') {
 403                         o->type = OPTION_GROUP;
 404                         o->help = xstrdup(skipspaces(sb.buf));
 405                         continue;
 406                 }
 407
 408                 o->type = OPTION_CALLBACK;
 409                 o->help = xstrdup(skipspaces(s));
 410                 o->value = &parsed;
 411                 o->flags = PARSE_OPT_NOARG;
 412                 o->callback = &parseopt_dump;
 413                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 414                         switch (*--s) {
 415                         case '=':
 416                                 o->flags &= ~PARSE_OPT_NOARG;
 417                                 break;
 418                         case '?':
 419                                 o->flags &= ~PARSE_OPT_NOARG;
 420                                 o->flags |= PARSE_OPT_OPTARG;
 421                                 break;
 422                         case '!':
 423                                 o->flags |= PARSE_OPT_NONEG;
 424                                 break;
 425                         case '*':
 426                                 o->flags |= PARSE_OPT_HIDDEN;
 427                                 break;
 428                         }
 429                 }
 430
 431                 if (s - sb.buf == 1) /* short option only */
 432                         o->short_name = *sb.buf;
 433                 else if (sb.buf[1] != ',') /* long option only */
 434                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 435                 else {
 436                         o->short_name = *sb.buf;
 437                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 438                 }
 439         }
 440         strbuf_release(&sb);
 441
 442         /* put an OPT_END() */
 443         ALLOC_GROW(opts, onb + 1, osz);
 444         memset(opts + onb, 0, sizeof(opts[onb]));
 445         argc = parse_options(argc, argv, prefix, opts, usage,
 446                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 447                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 448                         PARSE_OPT_SHELL_EVAL);
 449
 450         strbuf_addf(&parsed, " --");
 451         sq_quote_argv(&parsed, argv, 0);
 452         puts(parsed.buf);
 453         return 0;
 454 }
 455
 456 static int cmd_sq_quote(int argc, const char **argv)
 457 {
 458         struct strbuf buf = STRBUF_INIT;
 459
 460         if (argc)
 461                 sq_quote_argv(&buf, argv, 0);
 462         printf("%s\n", buf.buf);
 463         strbuf_release(&buf);
 464
 465         return 0;
 466 }
 467
 468 static void die_no_single_rev(int quiet)
 469 {
 470         if (quiet)
 471                 exit(1);
 472         else
 473                 die("Needed a single revision");
 474 }
 475
 476 static const char builtin_rev_parse_usage[] =
 477 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 478    "   or: git rev-parse --sq-quote [<arg>...]\n"
 479    "   or: git rev-parse [options] [<arg>...]\n"
 480    "\n"
 481    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 482
 483 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 484 {
 485         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 486         int output_prefix = 0;
 487         unsigned char sha1[20];
 488         const char *name = NULL;
 489
 490         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 491                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 492
 493         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 494                 return cmd_sq_quote(argc - 2, argv + 2);
 495
 496         if (argc > 1 && !strcmp("-h", argv[1]))
 497                 usage(builtin_rev_parse_usage);
 498
 499         prefix = setup_git_directory();
 500         git_config(git_default_config, NULL);
 501         for (i = 1; i < argc; i++) {
 502                 const char *arg = argv[i];
 503
 504                 if (as_is) {
 505                         if (show_file(arg, output_prefix) && as_is < 2)
 506                                 verify_filename(prefix, arg, 0);
 507                         continue;
 508                 }
 509                 if (!strcmp(arg,"-n")) {
 510                         if (++i >= argc)
 511                                 die("-n requires an argument");
 512                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 513                                 show(arg);
 514                                 show(argv[i]);
 515                         }
 516                         continue;
 517                 }
 518                 if (!prefixcmp(arg, "-n")) {
 519                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 520                                 show(arg);
 521                         continue;
 522                 }
 523
 524                 if (*arg == '-') {
 525                         if (!strcmp(arg, "--")) {
 526                                 as_is = 2;
 527                                 /* Pass on the "--" if we show anything but files.. */
 528                                 if (filter & (DO_FLAGS | DO_REVS))
 529                                         show_file(arg, 0);
 530                                 continue;
 531                         }
 532                         if (!strcmp(arg, "--default")) {
 533                                 def = argv[i+1];
 534                                 i++;
 535                                 continue;
 536                         }
 537                         if (!strcmp(arg, "--prefix")) {
 538                                 prefix = argv[i+1];
 539                                 startup_info->prefix = prefix;
 540                                 output_prefix = 1;
 541                                 i++;
 542                                 continue;
 543                         }
 544                         if (!strcmp(arg, "--revs-only")) {
 545                                 filter &= ~DO_NOREV;
 546                                 continue;
 547                         }
 548                         if (!strcmp(arg, "--no-revs")) {
 549                                 filter &= ~DO_REVS;
 550                                 continue;
 551                         }
 552                         if (!strcmp(arg, "--flags")) {
 553                                 filter &= ~DO_NONFLAGS;
 554                                 continue;
 555                         }
 556                         if (!strcmp(arg, "--no-flags")) {
 557                                 filter &= ~DO_FLAGS;
 558                                 continue;
 559                         }
 560                         if (!strcmp(arg, "--verify")) {
 561                                 filter &= ~(DO_FLAGS|DO_NOREV);
 562                                 verify = 1;
 563                                 continue;
 564                         }
 565                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 566                                 quiet = 1;
 567                                 continue;
 568                         }
 569                         if (!strcmp(arg, "--short") ||
 570                             !prefixcmp(arg, "--short=")) {
 571                                 filter &= ~(DO_FLAGS|DO_NOREV);
 572                                 verify = 1;
 573                                 abbrev = DEFAULT_ABBREV;
 574                                 if (arg[7] == '=')
 575                                         abbrev = strtoul(arg + 8, NULL, 10);
 576                                 if (abbrev < MINIMUM_ABBREV)
 577                                         abbrev = MINIMUM_ABBREV;
 578                                 else if (40 <= abbrev)
 579                                         abbrev = 40;
 580                                 continue;
 581                         }
 582                         if (!strcmp(arg, "--sq")) {
 583                                 output_sq = 1;
 584                                 continue;
 585                         }
 586                         if (!strcmp(arg, "--not")) {
 587                                 show_type ^= REVERSED;
 588                                 continue;
 589                         }
 590                         if (!strcmp(arg, "--symbolic")) {
 591                                 symbolic = SHOW_SYMBOLIC_ASIS;
 592                                 continue;
 593                         }
 594                         if (!strcmp(arg, "--symbolic-full-name")) {
 595                                 symbolic = SHOW_SYMBOLIC_FULL;
 596                                 continue;
 597                         }
 598                         if (!prefixcmp(arg, "--abbrev-ref") &&
 599                             (!arg[12] || arg[12] == '=')) {
 600                                 abbrev_ref = 1;
 601                                 abbrev_ref_strict = warn_ambiguous_refs;
 602                                 if (arg[12] == '=') {
 603                                         if (!strcmp(arg + 13, "strict"))
 604                                                 abbrev_ref_strict = 1;
 605                                         else if (!strcmp(arg + 13, "loose"))
 606                                                 abbrev_ref_strict = 0;
 607                                         else
 608                                                 die("unknown mode for %s", arg);
 609                                 }
 610                                 continue;
 611                         }
 612                         if (!strcmp(arg, "--all")) {
 613                                 for_each_ref(show_reference, NULL);
 614                                 continue;
 615                         }
 616                         if (!prefixcmp(arg, "--disambiguate=")) {
 617                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 618                                 continue;
 619                         }
 620                         if (!strcmp(arg, "--bisect")) {
 621                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 622                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 623                                 continue;
 624                         }
 625                         if (!prefixcmp(arg, "--branches=")) {
 626                                 for_each_glob_ref_in(show_reference, arg + 11,
 627                                         "refs/heads/", NULL);
 628                                 continue;
 629                         }
 630                         if (!strcmp(arg, "--branches")) {
 631                                 for_each_branch_ref(show_reference, NULL);
 632                                 continue;
 633                         }
 634                         if (!prefixcmp(arg, "--tags=")) {
 635                                 for_each_glob_ref_in(show_reference, arg + 7,
 636                                         "refs/tags/", NULL);
 637                                 continue;
 638                         }
 639                         if (!strcmp(arg, "--tags")) {
 640                                 for_each_tag_ref(show_reference, NULL);
 641                                 continue;
 642                         }
 643                         if (!prefixcmp(arg, "--glob=")) {
 644                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 645                                 continue;
 646                         }
 647                         if (!prefixcmp(arg, "--remotes=")) {
 648                                 for_each_glob_ref_in(show_reference, arg + 10,
 649                                         "refs/remotes/", NULL);
 650                                 continue;
 651                         }
 652                         if (!strcmp(arg, "--remotes")) {
 653                                 for_each_remote_ref(show_reference, NULL);
 654                                 continue;
 655                         }
 656                         if (!strcmp(arg, "--local-env-vars")) {
 657                                 int i;
 658                                 for (i = 0; local_repo_env[i]; i++)
 659                                         printf("%s\n", local_repo_env[i]);
 660                                 continue;
 661                         }
 662                         if (!strcmp(arg, "--show-toplevel")) {
 663                                 const char *work_tree = get_git_work_tree();
 664                                 if (work_tree)
 665                                         puts(work_tree);
 666                                 continue;
 667                         }
 668                         if (!strcmp(arg, "--show-prefix")) {
 669                                 if (prefix)
 670                                         puts(prefix);
 671                                 else
 672                                         putchar('\n');
 673                                 continue;
 674                         }
 675                         if (!strcmp(arg, "--show-cdup")) {
 676                                 const char *pfx = prefix;
 677                                 if (!is_inside_work_tree()) {
 678                                         const char *work_tree =
 679                                                 get_git_work_tree();
 680                                         if (work_tree)
 681                                                 printf("%s\n", work_tree);
 682                                         continue;
 683                                 }
 684                                 while (pfx) {
 685                                         pfx = strchr(pfx, '/');
 686                                         if (pfx) {
 687                                                 pfx++;
 688                                                 printf("../");
 689                                         }
 690                                 }
 691                                 putchar('\n');
 692                                 continue;
 693                         }
 694                         if (!strcmp(arg, "--git-dir")) {
 695                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 696                                 static char cwd[PATH_MAX];
 697                                 int len;
 698                                 if (gitdir) {
 699                                         puts(gitdir);
 700                                         continue;
 701                                 }
 702                                 if (!prefix) {
 703                                         puts(".git");
 704                                         continue;
 705                                 }
 706                                 if (!getcwd(cwd, PATH_MAX))
 707                                         die_errno("unable to get current working directory");
 708                                 len = strlen(cwd);
 709                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 710                                 continue;
 711                         }
 712                         if (!strcmp(arg, "--resolve-git-dir")) {
 713                                 const char *gitdir = resolve_gitdir(argv[i+1]);
 714                                 if (!gitdir)
 715                                         die("not a gitdir '%s'", argv[i+1]);
 716                                 puts(gitdir);
 717                                 continue;
 718                         }
 719                         if (!strcmp(arg, "--is-inside-git-dir")) {
 720                                 printf("%s\n", is_inside_git_dir() ? "true"
 721                                                 : "false");
 722                                 continue;
 723                         }
 724                         if (!strcmp(arg, "--is-inside-work-tree")) {
 725                                 printf("%s\n", is_inside_work_tree() ? "true"
 726                                                 : "false");
 727                                 continue;
 728                         }
 729                         if (!strcmp(arg, "--is-bare-repository")) {
 730                                 printf("%s\n", is_bare_repository() ? "true"
 731                                                 : "false");
 732                                 continue;
 733                         }
 734                         if (!prefixcmp(arg, "--since=")) {
 735                                 show_datestring("--max-age=", arg+8);
 736                                 continue;
 737                         }
 738                         if (!prefixcmp(arg, "--after=")) {
 739                                 show_datestring("--max-age=", arg+8);
 740                                 continue;
 741                         }
 742                         if (!prefixcmp(arg, "--before=")) {
 743                                 show_datestring("--min-age=", arg+9);
 744                                 continue;
 745                         }
 746                         if (!prefixcmp(arg, "--until=")) {
 747                                 show_datestring("--min-age=", arg+8);
 748                                 continue;
 749                         }
 750                         if (show_flag(arg) && verify)
 751                                 die_no_single_rev(quiet);
 752                         continue;
 753                 }
 754
 755                 /* Not a flag argument */
 756                 if (try_difference(arg))
 757                         continue;
 758                 if (try_parent_shorthands(arg))
 759                         continue;
 760                 name = arg;
 761                 type = NORMAL;
 762                 if (*arg == '^') {
 763                         name++;
 764                         type = REVERSED;
 765                 }
 766                 if (!get_sha1(name, sha1)) {
 767                         if (verify)
 768                                 revs_count++;
 769                         else
 770                                 show_rev(type, sha1, name);
 771                         continue;
 772                 }
 773                 if (verify)
 774                         die_no_single_rev(quiet);
 775                 as_is = 1;
 776                 if (!show_file(arg, output_prefix))
 777                         continue;
 778                 verify_filename(prefix, arg, 1);
 779         }
 780         if (verify) {
 781                 if (revs_count == 1) {
 782                         show_rev(type, sha1, name);
 783                         return 0;
 784                 } else if (revs_count == 0 && show_default())
 785                         return 0;
 786                 die_no_single_rev(quiet);
 787         } else
 788                 show_default();
 789         return 0;
 790 }