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 int show_abbrev(const unsigned char *sha1, void *cb_data)
 199 {
 200         show_rev(NORMAL, sha1, NULL);
 201         return 0;
 202 }
 203
 204 static void show_datestring(const char *flag, const char *datestr)
 205 {
 206         static char buffer[100];
 207
 208         /* date handling requires both flags and revs */
 209         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 210                 return;
 211         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 212         show(buffer);
 213 }
 214
 215 static int show_file(const char *arg, int output_prefix)
 216 {
 217         show_default();
 218         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 219                 if (output_prefix) {
 220                         const char *prefix = startup_info->prefix;
 221                         show(prefix_filename(prefix,
 222                                              prefix ? strlen(prefix) : 0,
 223                                              arg));
 224                 } else
 225                         show(arg);
 226                 return 1;
 227         }
 228         return 0;
 229 }
 230
 231 static int try_difference(const char *arg)
 232 {
 233         char *dotdot;
 234         unsigned char sha1[20];
 235         unsigned char end[20];
 236         const char *next;
 237         const char *this;
 238         int symmetric;
 239         static const char head_by_default[] = "HEAD";
 240
 241         if (!(dotdot = strstr(arg, "..")))
 242                 return 0;
 243         next = dotdot + 2;
 244         this = arg;
 245         symmetric = (*next == '.');
 246
 247         *dotdot = 0;
 248         next += symmetric;
 249
 250         if (!*next)
 251                 next = head_by_default;
 252         if (dotdot == arg)
 253                 this = head_by_default;
 254
 255         if (this == head_by_default && next == head_by_default &&
 256             !symmetric) {
 257                 /*
 258                  * Just ".."?  That is not a range but the
 259                  * pathspec for the parent directory.
 260                  */
 261                 *dotdot = '.';
 262                 return 0;
 263         }
 264
 265         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 266                 show_rev(NORMAL, end, next);
 267                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 268                 if (symmetric) {
 269                         struct commit_list *exclude;
 270                         struct commit *a, *b;
 271                         a = lookup_commit_reference(sha1);
 272                         b = lookup_commit_reference(end);
 273                         exclude = get_merge_bases(a, b, 1);
 274                         while (exclude) {
 275                                 struct commit_list *n = exclude->next;
 276                                 show_rev(REVERSED,
 277                                          exclude->item->object.sha1,NULL);
 278                                 free(exclude);
 279                                 exclude = n;
 280                         }
 281                 }
 282                 return 1;
 283         }
 284         *dotdot = '.';
 285         return 0;
 286 }
 287
 288 static int try_parent_shorthands(const char *arg)
 289 {
 290         char *dotdot;
 291         unsigned char sha1[20];
 292         struct commit *commit;
 293         struct commit_list *parents;
 294         int parents_only;
 295
 296         if ((dotdot = strstr(arg, "^!")))
 297                 parents_only = 0;
 298         else if ((dotdot = strstr(arg, "^@")))
 299                 parents_only = 1;
 300
 301         if (!dotdot || dotdot[2])
 302                 return 0;
 303
 304         *dotdot = 0;
 305         if (get_sha1_committish(arg, sha1))
 306                 return 0;
 307
 308         if (!parents_only)
 309                 show_rev(NORMAL, sha1, arg);
 310         commit = lookup_commit_reference(sha1);
 311         for (parents = commit->parents; parents; parents = parents->next)
 312                 show_rev(parents_only ? NORMAL : REVERSED,
 313                                 parents->item->object.sha1, arg);
 314
 315         return 1;
 316 }
 317
 318 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 319 {
 320         struct strbuf *parsed = o->value;
 321         if (unset)
 322                 strbuf_addf(parsed, " --no-%s", o->long_name);
 323         else if (o->short_name)
 324                 strbuf_addf(parsed, " -%c", o->short_name);
 325         else
 326                 strbuf_addf(parsed, " --%s", o->long_name);
 327         if (arg) {
 328                 strbuf_addch(parsed, ' ');
 329                 sq_quote_buf(parsed, arg);
 330         }
 331         return 0;
 332 }
 333
 334 static const char *skipspaces(const char *s)
 335 {
 336         while (isspace(*s))
 337                 s++;
 338         return s;
 339 }
 340
 341 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 342 {
 343         static int keep_dashdash = 0, stop_at_non_option = 0;
 344         static char const * const parseopt_usage[] = {
 345                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
 346                 NULL
 347         };
 348         static struct option parseopt_opts[] = {
 349                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 350                                         N_("keep the `--` passed as an arg")),
 351                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 352                                         N_("stop parsing after the "
 353                                            "first non-option argument")),
 354                 OPT_END(),
 355         };
 356
 357         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 358         const char **usage = NULL;
 359         struct option *opts = NULL;
 360         int onb = 0, osz = 0, unb = 0, usz = 0;
 361
 362         strbuf_addstr(&parsed, "set --");
 363         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 364                              PARSE_OPT_KEEP_DASHDASH);
 365         if (argc < 1 || strcmp(argv[0], "--"))
 366                 usage_with_options(parseopt_usage, parseopt_opts);
 367
 368         /* get the usage up to the first line with a -- on it */
 369         for (;;) {
 370                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 371                         die("premature end of input");
 372                 ALLOC_GROW(usage, unb + 1, usz);
 373                 if (!strcmp("--", sb.buf)) {
 374                         if (unb < 1)
 375                                 die("no usage string given before the `--' separator");
 376                         usage[unb] = NULL;
 377                         break;
 378                 }
 379                 usage[unb++] = strbuf_detach(&sb, NULL);
 380         }
 381
 382         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 383         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 384                 const char *s;
 385                 struct option *o;
 386
 387                 if (!sb.len)
 388                         continue;
 389
 390                 ALLOC_GROW(opts, onb + 1, osz);
 391                 memset(opts + onb, 0, sizeof(opts[onb]));
 392
 393                 o = &opts[onb++];
 394                 s = strchr(sb.buf, ' ');
 395                 if (!s || *sb.buf == ' ') {
 396                         o->type = OPTION_GROUP;
 397                         o->help = xstrdup(skipspaces(sb.buf));
 398                         continue;
 399                 }
 400
 401                 o->type = OPTION_CALLBACK;
 402                 o->help = xstrdup(skipspaces(s));
 403                 o->value = &parsed;
 404                 o->flags = PARSE_OPT_NOARG;
 405                 o->callback = &parseopt_dump;
 406                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 407                         switch (*--s) {
 408                         case '=':
 409                                 o->flags &= ~PARSE_OPT_NOARG;
 410                                 break;
 411                         case '?':
 412                                 o->flags &= ~PARSE_OPT_NOARG;
 413                                 o->flags |= PARSE_OPT_OPTARG;
 414                                 break;
 415                         case '!':
 416                                 o->flags |= PARSE_OPT_NONEG;
 417                                 break;
 418                         case '*':
 419                                 o->flags |= PARSE_OPT_HIDDEN;
 420                                 break;
 421                         }
 422                 }
 423
 424                 if (s - sb.buf == 1) /* short option only */
 425                         o->short_name = *sb.buf;
 426                 else if (sb.buf[1] != ',') /* long option only */
 427                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 428                 else {
 429                         o->short_name = *sb.buf;
 430                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 431                 }
 432         }
 433         strbuf_release(&sb);
 434
 435         /* put an OPT_END() */
 436         ALLOC_GROW(opts, onb + 1, osz);
 437         memset(opts + onb, 0, sizeof(opts[onb]));
 438         argc = parse_options(argc, argv, prefix, opts, usage,
 439                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 440                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 441                         PARSE_OPT_SHELL_EVAL);
 442
 443         strbuf_addf(&parsed, " --");
 444         sq_quote_argv(&parsed, argv, 0);
 445         puts(parsed.buf);
 446         return 0;
 447 }
 448
 449 static int cmd_sq_quote(int argc, const char **argv)
 450 {
 451         struct strbuf buf = STRBUF_INIT;
 452
 453         if (argc)
 454                 sq_quote_argv(&buf, argv, 0);
 455         printf("%s\n", buf.buf);
 456         strbuf_release(&buf);
 457
 458         return 0;
 459 }
 460
 461 static void die_no_single_rev(int quiet)
 462 {
 463         if (quiet)
 464                 exit(1);
 465         else
 466                 die("Needed a single revision");
 467 }
 468
 469 static const char builtin_rev_parse_usage[] =
 470 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 471    "   or: git rev-parse --sq-quote [<arg>...]\n"
 472    "   or: git rev-parse [options] [<arg>...]\n"
 473    "\n"
 474    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 475
 476 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 477 {
 478         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 479         int has_dashdash = 0;
 480         int output_prefix = 0;
 481         unsigned char sha1[20];
 482         const char *name = NULL;
 483
 484         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 485                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 486
 487         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 488                 return cmd_sq_quote(argc - 2, argv + 2);
 489
 490         if (argc > 1 && !strcmp("-h", argv[1]))
 491                 usage(builtin_rev_parse_usage);
 492
 493         for (i = 1; i < argc; i++) {
 494                 if (!strcmp(argv[i], "--")) {
 495                         has_dashdash = 1;
 496                         break;
 497                 }
 498         }
 499
 500         prefix = setup_git_directory();
 501         git_config(git_default_config, NULL);
 502         for (i = 1; i < argc; i++) {
 503                 const char *arg = argv[i];
 504
 505                 if (as_is) {
 506                         if (show_file(arg, output_prefix) && as_is < 2)
 507                                 verify_filename(prefix, arg, 0);
 508                         continue;
 509                 }
 510                 if (!strcmp(arg,"-n")) {
 511                         if (++i >= argc)
 512                                 die("-n requires an argument");
 513                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 514                                 show(arg);
 515                                 show(argv[i]);
 516                         }
 517                         continue;
 518                 }
 519                 if (!prefixcmp(arg, "-n")) {
 520                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 521                                 show(arg);
 522                         continue;
 523                 }
 524
 525                 if (*arg == '-') {
 526                         if (!strcmp(arg, "--")) {
 527                                 as_is = 2;
 528                                 /* Pass on the "--" if we show anything but files.. */
 529                                 if (filter & (DO_FLAGS | DO_REVS))
 530                                         show_file(arg, 0);
 531                                 continue;
 532                         }
 533                         if (!strcmp(arg, "--default")) {
 534                                 def = argv[i+1];
 535                                 i++;
 536                                 continue;
 537                         }
 538                         if (!strcmp(arg, "--prefix")) {
 539                                 prefix = argv[i+1];
 540                                 startup_info->prefix = prefix;
 541                                 output_prefix = 1;
 542                                 i++;
 543                                 continue;
 544                         }
 545                         if (!strcmp(arg, "--revs-only")) {
 546                                 filter &= ~DO_NOREV;
 547                                 continue;
 548                         }
 549                         if (!strcmp(arg, "--no-revs")) {
 550                                 filter &= ~DO_REVS;
 551                                 continue;
 552                         }
 553                         if (!strcmp(arg, "--flags")) {
 554                                 filter &= ~DO_NONFLAGS;
 555                                 continue;
 556                         }
 557                         if (!strcmp(arg, "--no-flags")) {
 558                                 filter &= ~DO_FLAGS;
 559                                 continue;
 560                         }
 561                         if (!strcmp(arg, "--verify")) {
 562                                 filter &= ~(DO_FLAGS|DO_NOREV);
 563                                 verify = 1;
 564                                 continue;
 565                         }
 566                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 567                                 quiet = 1;
 568                                 continue;
 569                         }
 570                         if (!strcmp(arg, "--short") ||
 571                             !prefixcmp(arg, "--short=")) {
 572                                 filter &= ~(DO_FLAGS|DO_NOREV);
 573                                 verify = 1;
 574                                 abbrev = DEFAULT_ABBREV;
 575                                 if (arg[7] == '=')
 576                                         abbrev = strtoul(arg + 8, NULL, 10);
 577                                 if (abbrev < MINIMUM_ABBREV)
 578                                         abbrev = MINIMUM_ABBREV;
 579                                 else if (40 <= abbrev)
 580                                         abbrev = 40;
 581                                 continue;
 582                         }
 583                         if (!strcmp(arg, "--sq")) {
 584                                 output_sq = 1;
 585                                 continue;
 586                         }
 587                         if (!strcmp(arg, "--not")) {
 588                                 show_type ^= REVERSED;
 589                                 continue;
 590                         }
 591                         if (!strcmp(arg, "--symbolic")) {
 592                                 symbolic = SHOW_SYMBOLIC_ASIS;
 593                                 continue;
 594                         }
 595                         if (!strcmp(arg, "--symbolic-full-name")) {
 596                                 symbolic = SHOW_SYMBOLIC_FULL;
 597                                 continue;
 598                         }
 599                         if (!prefixcmp(arg, "--abbrev-ref") &&
 600                             (!arg[12] || arg[12] == '=')) {
 601                                 abbrev_ref = 1;
 602                                 abbrev_ref_strict = warn_ambiguous_refs;
 603                                 if (arg[12] == '=') {
 604                                         if (!strcmp(arg + 13, "strict"))
 605                                                 abbrev_ref_strict = 1;
 606                                         else if (!strcmp(arg + 13, "loose"))
 607                                                 abbrev_ref_strict = 0;
 608                                         else
 609                                                 die("unknown mode for %s", arg);
 610                                 }
 611                                 continue;
 612                         }
 613                         if (!strcmp(arg, "--all")) {
 614                                 for_each_ref(show_reference, NULL);
 615                                 continue;
 616                         }
 617                         if (!prefixcmp(arg, "--disambiguate=")) {
 618                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 619                                 continue;
 620                         }
 621                         if (!strcmp(arg, "--bisect")) {
 622                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 623                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 624                                 continue;
 625                         }
 626                         if (!prefixcmp(arg, "--branches=")) {
 627                                 for_each_glob_ref_in(show_reference, arg + 11,
 628                                         "refs/heads/", NULL);
 629                                 continue;
 630                         }
 631                         if (!strcmp(arg, "--branches")) {
 632                                 for_each_branch_ref(show_reference, NULL);
 633                                 continue;
 634                         }
 635                         if (!prefixcmp(arg, "--tags=")) {
 636                                 for_each_glob_ref_in(show_reference, arg + 7,
 637                                         "refs/tags/", NULL);
 638                                 continue;
 639                         }
 640                         if (!strcmp(arg, "--tags")) {
 641                                 for_each_tag_ref(show_reference, NULL);
 642                                 continue;
 643                         }
 644                         if (!prefixcmp(arg, "--glob=")) {
 645                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 646                                 continue;
 647                         }
 648                         if (!prefixcmp(arg, "--remotes=")) {
 649                                 for_each_glob_ref_in(show_reference, arg + 10,
 650                                         "refs/remotes/", NULL);
 651                                 continue;
 652                         }
 653                         if (!strcmp(arg, "--remotes")) {
 654                                 for_each_remote_ref(show_reference, NULL);
 655                                 continue;
 656                         }
 657                         if (!strcmp(arg, "--local-env-vars")) {
 658                                 int i;
 659                                 for (i = 0; local_repo_env[i]; i++)
 660                                         printf("%s\n", local_repo_env[i]);
 661                                 continue;
 662                         }
 663                         if (!strcmp(arg, "--show-toplevel")) {
 664                                 const char *work_tree = get_git_work_tree();
 665                                 if (work_tree)
 666                                         puts(work_tree);
 667                                 continue;
 668                         }
 669                         if (!strcmp(arg, "--show-prefix")) {
 670                                 if (prefix)
 671                                         puts(prefix);
 672                                 else
 673                                         putchar('\n');
 674                                 continue;
 675                         }
 676                         if (!strcmp(arg, "--show-cdup")) {
 677                                 const char *pfx = prefix;
 678                                 if (!is_inside_work_tree()) {
 679                                         const char *work_tree =
 680                                                 get_git_work_tree();
 681                                         if (work_tree)
 682                                                 printf("%s\n", work_tree);
 683                                         continue;
 684                                 }
 685                                 while (pfx) {
 686                                         pfx = strchr(pfx, '/');
 687                                         if (pfx) {
 688                                                 pfx++;
 689                                                 printf("../");
 690                                         }
 691                                 }
 692                                 putchar('\n');
 693                                 continue;
 694                         }
 695                         if (!strcmp(arg, "--git-dir")) {
 696                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 697                                 static char cwd[PATH_MAX];
 698                                 int len;
 699                                 if (gitdir) {
 700                                         puts(gitdir);
 701                                         continue;
 702                                 }
 703                                 if (!prefix) {
 704                                         puts(".git");
 705                                         continue;
 706                                 }
 707                                 if (!getcwd(cwd, PATH_MAX))
 708                                         die_errno("unable to get current working directory");
 709                                 len = strlen(cwd);
 710                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 711                                 continue;
 712                         }
 713                         if (!strcmp(arg, "--resolve-git-dir")) {
 714                                 const char *gitdir = resolve_gitdir(argv[i+1]);
 715                                 if (!gitdir)
 716                                         die("not a gitdir '%s'", argv[i+1]);
 717                                 puts(gitdir);
 718                                 continue;
 719                         }
 720                         if (!strcmp(arg, "--is-inside-git-dir")) {
 721                                 printf("%s\n", is_inside_git_dir() ? "true"
 722                                                 : "false");
 723                                 continue;
 724                         }
 725                         if (!strcmp(arg, "--is-inside-work-tree")) {
 726                                 printf("%s\n", is_inside_work_tree() ? "true"
 727                                                 : "false");
 728                                 continue;
 729                         }
 730                         if (!strcmp(arg, "--is-bare-repository")) {
 731                                 printf("%s\n", is_bare_repository() ? "true"
 732                                                 : "false");
 733                                 continue;
 734                         }
 735                         if (!prefixcmp(arg, "--since=")) {
 736                                 show_datestring("--max-age=", arg+8);
 737                                 continue;
 738                         }
 739                         if (!prefixcmp(arg, "--after=")) {
 740                                 show_datestring("--max-age=", arg+8);
 741                                 continue;
 742                         }
 743                         if (!prefixcmp(arg, "--before=")) {
 744                                 show_datestring("--min-age=", arg+9);
 745                                 continue;
 746                         }
 747                         if (!prefixcmp(arg, "--until=")) {
 748                                 show_datestring("--min-age=", arg+8);
 749                                 continue;
 750                         }
 751                         if (show_flag(arg) && verify)
 752                                 die_no_single_rev(quiet);
 753                         continue;
 754                 }
 755
 756                 /* Not a flag argument */
 757                 if (try_difference(arg))
 758                         continue;
 759                 if (try_parent_shorthands(arg))
 760                         continue;
 761                 name = arg;
 762                 type = NORMAL;
 763                 if (*arg == '^') {
 764                         name++;
 765                         type = REVERSED;
 766                 }
 767                 if (!get_sha1(name, sha1)) {
 768                         if (verify)
 769                                 revs_count++;
 770                         else
 771                                 show_rev(type, sha1, name);
 772                         continue;
 773                 }
 774                 if (verify)
 775                         die_no_single_rev(quiet);
 776                 if (has_dashdash)
 777                         die("bad revision '%s'", arg);
 778                 as_is = 1;
 779                 if (!show_file(arg, output_prefix))
 780                         continue;
 781                 verify_filename(prefix, arg, 1);
 782         }
 783         if (verify) {
 784                 if (revs_count == 1) {
 785                         show_rev(type, sha1, name);
 786                         return 0;
 787                 } else if (revs_count == 0 && show_default())
 788                         return 0;
 789                 die_no_single_rev(quiet);
 790         } else
 791                 show_default();
 792         return 0;
 793 }