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 #include "diff.h"
  13 #include "revision.h"
  14 #include "split-index.h"
  15
  16 #define DO_REVS         1
  17 #define DO_NOREV        2
  18 #define DO_FLAGS        4
  19 #define DO_NONFLAGS     8
  20 static int filter = ~0;
  21
  22 static const char *def;
  23
  24 #define NORMAL 0
  25 #define REVERSED 1
  26 static int show_type = NORMAL;
  27
  28 #define SHOW_SYMBOLIC_ASIS 1
  29 #define SHOW_SYMBOLIC_FULL 2
  30 static int symbolic;
  31 static int abbrev;
  32 static int abbrev_ref;
  33 static int abbrev_ref_strict;
  34 static int output_sq;
  35
  36 static int stuck_long;
  37 static struct string_list *ref_excludes;
  38
  39 /*
  40  * Some arguments are relevant "revision" arguments,
  41  * others are about output format or other details.
  42  * This sorts it all out.
  43  */
  44 static int is_rev_argument(const char *arg)
  45 {
  46         static const char *rev_args[] = {
  47                 "--all",
  48                 "--bisect",
  49                 "--dense",
  50                 "--branches=",
  51                 "--branches",
  52                 "--header",
  53                 "--ignore-missing",
  54                 "--max-age=",
  55                 "--max-count=",
  56                 "--min-age=",
  57                 "--no-merges",
  58                 "--min-parents=",
  59                 "--no-min-parents",
  60                 "--max-parents=",
  61                 "--no-max-parents",
  62                 "--objects",
  63                 "--objects-edge",
  64                 "--parents",
  65                 "--pretty",
  66                 "--remotes=",
  67                 "--remotes",
  68                 "--glob=",
  69                 "--sparse",
  70                 "--tags=",
  71                 "--tags",
  72                 "--topo-order",
  73                 "--date-order",
  74                 "--unpacked",
  75                 NULL
  76         };
  77         const char **p = rev_args;
  78
  79         /* accept -<digit>, like traditional "head" */
  80         if ((*arg == '-') && isdigit(arg[1]))
  81                 return 1;
  82
  83         for (;;) {
  84                 const char *str = *p++;
  85                 int len;
  86                 if (!str)
  87                         return 0;
  88                 len = strlen(str);
  89                 if (!strcmp(arg, str) ||
  90                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  91                         return 1;
  92         }
  93 }
  94
  95 /* Output argument as a string, either SQ or normal */
  96 static void show(const char *arg)
  97 {
  98         if (output_sq) {
  99                 int sq = '\'', ch;
 100
 101                 putchar(sq);
 102                 while ((ch = *arg++)) {
 103                         if (ch == sq)
 104                                 fputs("'\\'", stdout);
 105                         putchar(ch);
 106                 }
 107                 putchar(sq);
 108                 putchar(' ');
 109         }
 110         else
 111                 puts(arg);
 112 }
 113
 114 /* Like show(), but with a negation prefix according to type */
 115 static void show_with_type(int type, const char *arg)
 116 {
 117         if (type != show_type)
 118                 putchar('^');
 119         show(arg);
 120 }
 121
 122 /* Output a revision, only if filter allows it */
 123 static void show_rev(int type, const unsigned char *sha1, const char *name)
 124 {
 125         if (!(filter & DO_REVS))
 126                 return;
 127         def = NULL;
 128
 129         if ((symbolic || abbrev_ref) && name) {
 130                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 131                         unsigned char discard[20];
 132                         char *full;
 133
 134                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 135                         case 0:
 136                                 /*
 137                                  * Not found -- not a ref.  We could
 138                                  * emit "name" here, but symbolic-full
 139                                  * users are interested in finding the
 140                                  * refs spelled in full, and they would
 141                                  * need to filter non-refs if we did so.
 142                                  */
 143                                 break;
 144                         case 1: /* happy */
 145                                 if (abbrev_ref)
 146                                         full = shorten_unambiguous_ref(full,
 147                                                 abbrev_ref_strict);
 148                                 show_with_type(type, full);
 149                                 break;
 150                         default: /* ambiguous */
 151                                 error("refname '%s' is ambiguous", name);
 152                                 break;
 153                         }
 154                 } else {
 155                         show_with_type(type, name);
 156                 }
 157         }
 158         else if (abbrev)
 159                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 160         else
 161                 show_with_type(type, sha1_to_hex(sha1));
 162 }
 163
 164 /* Output a flag, only if filter allows it. */
 165 static int show_flag(const char *arg)
 166 {
 167         if (!(filter & DO_FLAGS))
 168                 return 0;
 169         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 170                 show(arg);
 171                 return 1;
 172         }
 173         return 0;
 174 }
 175
 176 static int show_default(void)
 177 {
 178         const char *s = def;
 179
 180         if (s) {
 181                 unsigned char sha1[20];
 182
 183                 def = NULL;
 184                 if (!get_sha1(s, sha1)) {
 185                         show_rev(NORMAL, sha1, s);
 186                         return 1;
 187                 }
 188         }
 189         return 0;
 190 }
 191
 192 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 193 {
 194         if (ref_excluded(ref_excludes, refname))
 195                 return 0;
 196         show_rev(NORMAL, sha1, refname);
 197         return 0;
 198 }
 199
 200 static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 201 {
 202         show_rev(REVERSED, sha1, refname);
 203         return 0;
 204 }
 205
 206 static int show_abbrev(const unsigned char *sha1, void *cb_data)
 207 {
 208         show_rev(NORMAL, sha1, NULL);
 209         return 0;
 210 }
 211
 212 static void show_datestring(const char *flag, const char *datestr)
 213 {
 214         static char buffer[100];
 215
 216         /* date handling requires both flags and revs */
 217         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 218                 return;
 219         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 220         show(buffer);
 221 }
 222
 223 static int show_file(const char *arg, int output_prefix)
 224 {
 225         show_default();
 226         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 227                 if (output_prefix) {
 228                         const char *prefix = startup_info->prefix;
 229                         show(prefix_filename(prefix,
 230                                              prefix ? strlen(prefix) : 0,
 231                                              arg));
 232                 } else
 233                         show(arg);
 234                 return 1;
 235         }
 236         return 0;
 237 }
 238
 239 static int try_difference(const char *arg)
 240 {
 241         char *dotdot;
 242         unsigned char sha1[20];
 243         unsigned char end[20];
 244         const char *next;
 245         const char *this;
 246         int symmetric;
 247         static const char head_by_default[] = "HEAD";
 248
 249         if (!(dotdot = strstr(arg, "..")))
 250                 return 0;
 251         next = dotdot + 2;
 252         this = arg;
 253         symmetric = (*next == '.');
 254
 255         *dotdot = 0;
 256         next += symmetric;
 257
 258         if (!*next)
 259                 next = head_by_default;
 260         if (dotdot == arg)
 261                 this = head_by_default;
 262
 263         if (this == head_by_default && next == head_by_default &&
 264             !symmetric) {
 265                 /*
 266                  * Just ".."?  That is not a range but the
 267                  * pathspec for the parent directory.
 268                  */
 269                 *dotdot = '.';
 270                 return 0;
 271         }
 272
 273         if (!get_sha1_committish(this, sha1) && !get_sha1_committish(next, end)) {
 274                 show_rev(NORMAL, end, next);
 275                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 276                 if (symmetric) {
 277                         struct commit_list *exclude;
 278                         struct commit *a, *b;
 279                         a = lookup_commit_reference(sha1);
 280                         b = lookup_commit_reference(end);
 281                         exclude = get_merge_bases(a, b, 1);
 282                         while (exclude) {
 283                                 struct commit_list *n = exclude->next;
 284                                 show_rev(REVERSED,
 285                                          exclude->item->object.sha1,NULL);
 286                                 free(exclude);
 287                                 exclude = n;
 288                         }
 289                 }
 290                 *dotdot = '.';
 291                 return 1;
 292         }
 293         *dotdot = '.';
 294         return 0;
 295 }
 296
 297 static int try_parent_shorthands(const char *arg)
 298 {
 299         char *dotdot;
 300         unsigned char sha1[20];
 301         struct commit *commit;
 302         struct commit_list *parents;
 303         int parents_only;
 304
 305         if ((dotdot = strstr(arg, "^!")))
 306                 parents_only = 0;
 307         else if ((dotdot = strstr(arg, "^@")))
 308                 parents_only = 1;
 309
 310         if (!dotdot || dotdot[2])
 311                 return 0;
 312
 313         *dotdot = 0;
 314         if (get_sha1_committish(arg, sha1)) {
 315                 *dotdot = '^';
 316                 return 0;
 317         }
 318
 319         if (!parents_only)
 320                 show_rev(NORMAL, sha1, arg);
 321         commit = lookup_commit_reference(sha1);
 322         for (parents = commit->parents; parents; parents = parents->next)
 323                 show_rev(parents_only ? NORMAL : REVERSED,
 324                                 parents->item->object.sha1, arg);
 325
 326         *dotdot = '^';
 327         return 1;
 328 }
 329
 330 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 331 {
 332         struct strbuf *parsed = o->value;
 333         if (unset)
 334                 strbuf_addf(parsed, " --no-%s", o->long_name);
 335         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 336                 strbuf_addf(parsed, " -%c", o->short_name);
 337         else
 338                 strbuf_addf(parsed, " --%s", o->long_name);
 339         if (arg) {
 340                 if (!stuck_long)
 341                         strbuf_addch(parsed, ' ');
 342                 else if (o->long_name)
 343                         strbuf_addch(parsed, '=');
 344                 sq_quote_buf(parsed, arg);
 345         }
 346         return 0;
 347 }
 348
 349 static const char *skipspaces(const char *s)
 350 {
 351         while (isspace(*s))
 352                 s++;
 353         return s;
 354 }
 355
 356 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 357 {
 358         static int keep_dashdash = 0, stop_at_non_option = 0;
 359         static char const * const parseopt_usage[] = {
 360                 N_("git rev-parse --parseopt [options] -- [<args>...]"),
 361                 NULL
 362         };
 363         static struct option parseopt_opts[] = {
 364                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 365                                         N_("keep the `--` passed as an arg")),
 366                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 367                                         N_("stop parsing after the "
 368                                            "first non-option argument")),
 369                 OPT_BOOL(0, "stuck-long", &stuck_long,
 370                                         N_("output in stuck long form")),
 371                 OPT_END(),
 372         };
 373
 374         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 375         const char **usage = NULL;
 376         struct option *opts = NULL;
 377         int onb = 0, osz = 0, unb = 0, usz = 0;
 378
 379         strbuf_addstr(&parsed, "set --");
 380         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 381                              PARSE_OPT_KEEP_DASHDASH);
 382         if (argc < 1 || strcmp(argv[0], "--"))
 383                 usage_with_options(parseopt_usage, parseopt_opts);
 384
 385         /* get the usage up to the first line with a -- on it */
 386         for (;;) {
 387                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 388                         die("premature end of input");
 389                 ALLOC_GROW(usage, unb + 1, usz);
 390                 if (!strcmp("--", sb.buf)) {
 391                         if (unb < 1)
 392                                 die("no usage string given before the `--' separator");
 393                         usage[unb] = NULL;
 394                         break;
 395                 }
 396                 usage[unb++] = strbuf_detach(&sb, NULL);
 397         }
 398
 399         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 400         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 401                 const char *s;
 402                 const char *end;
 403                 struct option *o;
 404
 405                 if (!sb.len)
 406                         continue;
 407
 408                 ALLOC_GROW(opts, onb + 1, osz);
 409                 memset(opts + onb, 0, sizeof(opts[onb]));
 410
 411                 o = &opts[onb++];
 412                 s = strchr(sb.buf, ' ');
 413                 if (!s || *sb.buf == ' ') {
 414                         o->type = OPTION_GROUP;
 415                         o->help = xstrdup(skipspaces(sb.buf));
 416                         continue;
 417                 }
 418
 419                 o->type = OPTION_CALLBACK;
 420                 o->help = xstrdup(skipspaces(s));
 421                 o->value = &parsed;
 422                 o->flags = PARSE_OPT_NOARG;
 423                 o->callback = &parseopt_dump;
 424
 425                 /* Possible argument name hint */
 426                 end = s;
 427                 while (s > sb.buf && strchr("*=?!", s[-1]) == NULL)
 428                         --s;
 429                 if (s != sb.buf && s != end)
 430                         o->argh = xmemdupz(s, end - s);
 431                 if (s == sb.buf)
 432                         s = end;
 433
 434                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 435                         switch (*--s) {
 436                         case '=':
 437                                 o->flags &= ~PARSE_OPT_NOARG;
 438                                 break;
 439                         case '?':
 440                                 o->flags &= ~PARSE_OPT_NOARG;
 441                                 o->flags |= PARSE_OPT_OPTARG;
 442                                 break;
 443                         case '!':
 444                                 o->flags |= PARSE_OPT_NONEG;
 445                                 break;
 446                         case '*':
 447                                 o->flags |= PARSE_OPT_HIDDEN;
 448                                 break;
 449                         }
 450                 }
 451
 452                 if (s - sb.buf == 1) /* short option only */
 453                         o->short_name = *sb.buf;
 454                 else if (sb.buf[1] != ',') /* long option only */
 455                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 456                 else {
 457                         o->short_name = *sb.buf;
 458                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 459                 }
 460         }
 461         strbuf_release(&sb);
 462
 463         /* put an OPT_END() */
 464         ALLOC_GROW(opts, onb + 1, osz);
 465         memset(opts + onb, 0, sizeof(opts[onb]));
 466         argc = parse_options(argc, argv, prefix, opts, usage,
 467                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 468                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 469                         PARSE_OPT_SHELL_EVAL);
 470
 471         strbuf_addf(&parsed, " --");
 472         sq_quote_argv(&parsed, argv, 0);
 473         puts(parsed.buf);
 474         return 0;
 475 }
 476
 477 static int cmd_sq_quote(int argc, const char **argv)
 478 {
 479         struct strbuf buf = STRBUF_INIT;
 480
 481         if (argc)
 482                 sq_quote_argv(&buf, argv, 0);
 483         printf("%s\n", buf.buf);
 484         strbuf_release(&buf);
 485
 486         return 0;
 487 }
 488
 489 static void die_no_single_rev(int quiet)
 490 {
 491         if (quiet)
 492                 exit(1);
 493         else
 494                 die("Needed a single revision");
 495 }
 496
 497 static const char builtin_rev_parse_usage[] =
 498 N_("git rev-parse --parseopt [options] -- [<args>...]\n"
 499    "   or: git rev-parse --sq-quote [<arg>...]\n"
 500    "   or: git rev-parse [options] [<arg>...]\n"
 501    "\n"
 502    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 503
 504 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 505 {
 506         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 507         int has_dashdash = 0;
 508         int output_prefix = 0;
 509         unsigned char sha1[20];
 510         const char *name = NULL;
 511
 512         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 513                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 514
 515         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 516                 return cmd_sq_quote(argc - 2, argv + 2);
 517
 518         if (argc > 1 && !strcmp("-h", argv[1]))
 519                 usage(builtin_rev_parse_usage);
 520
 521         for (i = 1; i < argc; i++) {
 522                 if (!strcmp(argv[i], "--")) {
 523                         has_dashdash = 1;
 524                         break;
 525                 }
 526         }
 527
 528         prefix = setup_git_directory();
 529         git_config(git_default_config, NULL);
 530         for (i = 1; i < argc; i++) {
 531                 const char *arg = argv[i];
 532
 533                 if (as_is) {
 534                         if (show_file(arg, output_prefix) && as_is < 2)
 535                                 verify_filename(prefix, arg, 0);
 536                         continue;
 537                 }
 538                 if (!strcmp(arg,"-n")) {
 539                         if (++i >= argc)
 540                                 die("-n requires an argument");
 541                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 542                                 show(arg);
 543                                 show(argv[i]);
 544                         }
 545                         continue;
 546                 }
 547                 if (starts_with(arg, "-n")) {
 548                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 549                                 show(arg);
 550                         continue;
 551                 }
 552
 553                 if (*arg == '-') {
 554                         if (!strcmp(arg, "--")) {
 555                                 as_is = 2;
 556                                 /* Pass on the "--" if we show anything but files.. */
 557                                 if (filter & (DO_FLAGS | DO_REVS))
 558                                         show_file(arg, 0);
 559                                 continue;
 560                         }
 561                         if (!strcmp(arg, "--default")) {
 562                                 def = argv[++i];
 563                                 if (!def)
 564                                         die("--default requires an argument");
 565                                 continue;
 566                         }
 567                         if (!strcmp(arg, "--prefix")) {
 568                                 prefix = argv[++i];
 569                                 if (!prefix)
 570                                         die("--prefix requires an argument");
 571                                 startup_info->prefix = prefix;
 572                                 output_prefix = 1;
 573                                 continue;
 574                         }
 575                         if (!strcmp(arg, "--revs-only")) {
 576                                 filter &= ~DO_NOREV;
 577                                 continue;
 578                         }
 579                         if (!strcmp(arg, "--no-revs")) {
 580                                 filter &= ~DO_REVS;
 581                                 continue;
 582                         }
 583                         if (!strcmp(arg, "--flags")) {
 584                                 filter &= ~DO_NONFLAGS;
 585                                 continue;
 586                         }
 587                         if (!strcmp(arg, "--no-flags")) {
 588                                 filter &= ~DO_FLAGS;
 589                                 continue;
 590                         }
 591                         if (!strcmp(arg, "--verify")) {
 592                                 filter &= ~(DO_FLAGS|DO_NOREV);
 593                                 verify = 1;
 594                                 continue;
 595                         }
 596                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 597                                 quiet = 1;
 598                                 continue;
 599                         }
 600                         if (!strcmp(arg, "--short") ||
 601                             starts_with(arg, "--short=")) {
 602                                 filter &= ~(DO_FLAGS|DO_NOREV);
 603                                 verify = 1;
 604                                 abbrev = DEFAULT_ABBREV;
 605                                 if (arg[7] == '=')
 606                                         abbrev = strtoul(arg + 8, NULL, 10);
 607                                 if (abbrev < MINIMUM_ABBREV)
 608                                         abbrev = MINIMUM_ABBREV;
 609                                 else if (40 <= abbrev)
 610                                         abbrev = 40;
 611                                 continue;
 612                         }
 613                         if (!strcmp(arg, "--sq")) {
 614                                 output_sq = 1;
 615                                 continue;
 616                         }
 617                         if (!strcmp(arg, "--not")) {
 618                                 show_type ^= REVERSED;
 619                                 continue;
 620                         }
 621                         if (!strcmp(arg, "--symbolic")) {
 622                                 symbolic = SHOW_SYMBOLIC_ASIS;
 623                                 continue;
 624                         }
 625                         if (!strcmp(arg, "--symbolic-full-name")) {
 626                                 symbolic = SHOW_SYMBOLIC_FULL;
 627                                 continue;
 628                         }
 629                         if (starts_with(arg, "--abbrev-ref") &&
 630                             (!arg[12] || arg[12] == '=')) {
 631                                 abbrev_ref = 1;
 632                                 abbrev_ref_strict = warn_ambiguous_refs;
 633                                 if (arg[12] == '=') {
 634                                         if (!strcmp(arg + 13, "strict"))
 635                                                 abbrev_ref_strict = 1;
 636                                         else if (!strcmp(arg + 13, "loose"))
 637                                                 abbrev_ref_strict = 0;
 638                                         else
 639                                                 die("unknown mode for %s", arg);
 640                                 }
 641                                 continue;
 642                         }
 643                         if (!strcmp(arg, "--all")) {
 644                                 for_each_ref(show_reference, NULL);
 645                                 continue;
 646                         }
 647                         if (starts_with(arg, "--disambiguate=")) {
 648                                 for_each_abbrev(arg + 15, show_abbrev, NULL);
 649                                 continue;
 650                         }
 651                         if (!strcmp(arg, "--bisect")) {
 652                                 for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 653                                 for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 654                                 continue;
 655                         }
 656                         if (starts_with(arg, "--branches=")) {
 657                                 for_each_glob_ref_in(show_reference, arg + 11,
 658                                         "refs/heads/", NULL);
 659                                 clear_ref_exclusion(&ref_excludes);
 660                                 continue;
 661                         }
 662                         if (!strcmp(arg, "--branches")) {
 663                                 for_each_branch_ref(show_reference, NULL);
 664                                 clear_ref_exclusion(&ref_excludes);
 665                                 continue;
 666                         }
 667                         if (starts_with(arg, "--tags=")) {
 668                                 for_each_glob_ref_in(show_reference, arg + 7,
 669                                         "refs/tags/", NULL);
 670                                 clear_ref_exclusion(&ref_excludes);
 671                                 continue;
 672                         }
 673                         if (!strcmp(arg, "--tags")) {
 674                                 for_each_tag_ref(show_reference, NULL);
 675                                 clear_ref_exclusion(&ref_excludes);
 676                                 continue;
 677                         }
 678                         if (starts_with(arg, "--glob=")) {
 679                                 for_each_glob_ref(show_reference, arg + 7, NULL);
 680                                 clear_ref_exclusion(&ref_excludes);
 681                                 continue;
 682                         }
 683                         if (starts_with(arg, "--remotes=")) {
 684                                 for_each_glob_ref_in(show_reference, arg + 10,
 685                                         "refs/remotes/", NULL);
 686                                 clear_ref_exclusion(&ref_excludes);
 687                                 continue;
 688                         }
 689                         if (!strcmp(arg, "--remotes")) {
 690                                 for_each_remote_ref(show_reference, NULL);
 691                                 clear_ref_exclusion(&ref_excludes);
 692                                 continue;
 693                         }
 694                         if (starts_with(arg, "--exclude=")) {
 695                                 add_ref_exclusion(&ref_excludes, arg + 10);
 696                                 continue;
 697                         }
 698                         if (!strcmp(arg, "--local-env-vars")) {
 699                                 int i;
 700                                 for (i = 0; local_repo_env[i]; i++)
 701                                         printf("%s\n", local_repo_env[i]);
 702                                 continue;
 703                         }
 704                         if (!strcmp(arg, "--show-toplevel")) {
 705                                 const char *work_tree = get_git_work_tree();
 706                                 if (work_tree)
 707                                         puts(work_tree);
 708                                 continue;
 709                         }
 710                         if (!strcmp(arg, "--show-prefix")) {
 711                                 if (prefix)
 712                                         puts(prefix);
 713                                 else
 714                                         putchar('\n');
 715                                 continue;
 716                         }
 717                         if (!strcmp(arg, "--show-cdup")) {
 718                                 const char *pfx = prefix;
 719                                 if (!is_inside_work_tree()) {
 720                                         const char *work_tree =
 721                                                 get_git_work_tree();
 722                                         if (work_tree)
 723                                                 printf("%s\n", work_tree);
 724                                         continue;
 725                                 }
 726                                 while (pfx) {
 727                                         pfx = strchr(pfx, '/');
 728                                         if (pfx) {
 729                                                 pfx++;
 730                                                 printf("../");
 731                                         }
 732                                 }
 733                                 putchar('\n');
 734                                 continue;
 735                         }
 736                         if (!strcmp(arg, "--git-dir")) {
 737                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 738                                 static char cwd[PATH_MAX];
 739                                 int len;
 740                                 if (gitdir) {
 741                                         puts(gitdir);
 742                                         continue;
 743                                 }
 744                                 if (!prefix) {
 745                                         puts(".git");
 746                                         continue;
 747                                 }
 748                                 if (!getcwd(cwd, PATH_MAX))
 749                                         die_errno("unable to get current working directory");
 750                                 len = strlen(cwd);
 751                                 printf("%s%s.git\n", cwd, len && cwd[len-1] != '/' ? "/" : "");
 752                                 continue;
 753                         }
 754                         if (!strcmp(arg, "--resolve-git-dir")) {
 755                                 const char *gitdir = argv[++i];
 756                                 if (!gitdir)
 757                                         die("--resolve-git-dir requires an argument");
 758                                 gitdir = resolve_gitdir(gitdir);
 759                                 if (!gitdir)
 760                                         die("not a gitdir '%s'", argv[i]);
 761                                 puts(gitdir);
 762                                 continue;
 763                         }
 764                         if (!strcmp(arg, "--is-inside-git-dir")) {
 765                                 printf("%s\n", is_inside_git_dir() ? "true"
 766                                                 : "false");
 767                                 continue;
 768                         }
 769                         if (!strcmp(arg, "--is-inside-work-tree")) {
 770                                 printf("%s\n", is_inside_work_tree() ? "true"
 771                                                 : "false");
 772                                 continue;
 773                         }
 774                         if (!strcmp(arg, "--is-bare-repository")) {
 775                                 printf("%s\n", is_bare_repository() ? "true"
 776                                                 : "false");
 777                                 continue;
 778                         }
 779                         if (!strcmp(arg, "--shared-index-path")) {
 780                                 if (read_cache() < 0)
 781                                         die(_("Could not read the index"));
 782                                 if (the_index.split_index) {
 783                                         const unsigned char *sha1 = the_index.split_index->base_sha1;
 784                                         puts(git_path("sharedindex.%s", sha1_to_hex(sha1)));
 785                                 }
 786                                 continue;
 787                         }
 788                         if (starts_with(arg, "--since=")) {
 789                                 show_datestring("--max-age=", arg+8);
 790                                 continue;
 791                         }
 792                         if (starts_with(arg, "--after=")) {
 793                                 show_datestring("--max-age=", arg+8);
 794                                 continue;
 795                         }
 796                         if (starts_with(arg, "--before=")) {
 797                                 show_datestring("--min-age=", arg+9);
 798                                 continue;
 799                         }
 800                         if (starts_with(arg, "--until=")) {
 801                                 show_datestring("--min-age=", arg+8);
 802                                 continue;
 803                         }
 804                         if (show_flag(arg) && verify)
 805                                 die_no_single_rev(quiet);
 806                         continue;
 807                 }
 808
 809                 /* Not a flag argument */
 810                 if (try_difference(arg))
 811                         continue;
 812                 if (try_parent_shorthands(arg))
 813                         continue;
 814                 name = arg;
 815                 type = NORMAL;
 816                 if (*arg == '^') {
 817                         name++;
 818                         type = REVERSED;
 819                 }
 820                 if (!get_sha1(name, sha1)) {
 821                         if (verify)
 822                                 revs_count++;
 823                         else
 824                                 show_rev(type, sha1, name);
 825                         continue;
 826                 }
 827                 if (verify)
 828                         die_no_single_rev(quiet);
 829                 if (has_dashdash)
 830                         die("bad revision '%s'", arg);
 831                 as_is = 1;
 832                 if (!show_file(arg, output_prefix))
 833                         continue;
 834                 verify_filename(prefix, arg, 1);
 835         }
 836         if (verify) {
 837                 if (revs_count == 1) {
 838                         show_rev(type, sha1, name);
 839                         return 0;
 840                 } else if (revs_count == 0 && show_default())
 841                         return 0;
 842                 die_no_single_rev(quiet);
 843         } else
 844                 show_default();
 845         return 0;
 846 }