builtin/rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #define USE_THE_INDEX_VARIABLE
   7 #include "cache.h"
   8 #include "abspath.h"
   9 #include "alloc.h"
  10 #include "config.h"
  11 #include "commit.h"
  12 #include "environment.h"
  13 #include "gettext.h"
  14 #include "hex.h"
  15 #include "refs.h"
  16 #include "quote.h"
  17 #include "builtin.h"
  18 #include "object-name.h"
  19 #include "parse-options.h"
  20 #include "diff.h"
  21 #include "revision.h"
  22 #include "setup.h"
  23 #include "split-index.h"
  24 #include "submodule.h"
  25 #include "commit-reach.h"
  26 #include "shallow.h"
  27
  28 #define DO_REVS         1
  29 #define DO_NOREV        2
  30 #define DO_FLAGS        4
  31 #define DO_NONFLAGS     8
  32 static int filter = ~0;
  33
  34 static const char *def;
  35
  36 #define NORMAL 0
  37 #define REVERSED 1
  38 static int show_type = NORMAL;
  39
  40 #define SHOW_SYMBOLIC_ASIS 1
  41 #define SHOW_SYMBOLIC_FULL 2
  42 static int symbolic;
  43 static int abbrev;
  44 static int abbrev_ref;
  45 static int abbrev_ref_strict;
  46 static int output_sq;
  47
  48 static int stuck_long;
  49 static struct ref_exclusions ref_excludes = REF_EXCLUSIONS_INIT;
  50
  51 /*
  52  * Some arguments are relevant "revision" arguments,
  53  * others are about output format or other details.
  54  * This sorts it all out.
  55  */
  56 static int is_rev_argument(const char *arg)
  57 {
  58         static const char *rev_args[] = {
  59                 "--all",
  60                 "--bisect",
  61                 "--dense",
  62                 "--branches=",
  63                 "--branches",
  64                 "--header",
  65                 "--ignore-missing",
  66                 "--max-age=",
  67                 "--max-count=",
  68                 "--min-age=",
  69                 "--no-merges",
  70                 "--min-parents=",
  71                 "--no-min-parents",
  72                 "--max-parents=",
  73                 "--no-max-parents",
  74                 "--objects",
  75                 "--objects-edge",
  76                 "--parents",
  77                 "--pretty",
  78                 "--remotes=",
  79                 "--remotes",
  80                 "--glob=",
  81                 "--sparse",
  82                 "--tags=",
  83                 "--tags",
  84                 "--topo-order",
  85                 "--date-order",
  86                 "--unpacked",
  87                 NULL
  88         };
  89         const char **p = rev_args;
  90
  91         /* accept -<digit>, like traditional "head" */
  92         if ((*arg == '-') && isdigit(arg[1]))
  93                 return 1;
  94
  95         for (;;) {
  96                 const char *str = *p++;
  97                 int len;
  98                 if (!str)
  99                         return 0;
 100                 len = strlen(str);
 101                 if (!strcmp(arg, str) ||
 102                     (str[len-1] == '=' && !strncmp(arg, str, len)))
 103                         return 1;
 104         }
 105 }
 106
 107 /* Output argument as a string, either SQ or normal */
 108 static void show(const char *arg)
 109 {
 110         if (output_sq) {
 111                 int sq = '\'', ch;
 112
 113                 putchar(sq);
 114                 while ((ch = *arg++)) {
 115                         if (ch == sq)
 116                                 fputs("'\\'", stdout);
 117                         putchar(ch);
 118                 }
 119                 putchar(sq);
 120                 putchar(' ');
 121         }
 122         else
 123                 puts(arg);
 124 }
 125
 126 /* Like show(), but with a negation prefix according to type */
 127 static void show_with_type(int type, const char *arg)
 128 {
 129         if (type != show_type)
 130                 putchar('^');
 131         show(arg);
 132 }
 133
 134 /* Output a revision, only if filter allows it */
 135 static void show_rev(int type, const struct object_id *oid, const char *name)
 136 {
 137         if (!(filter & DO_REVS))
 138                 return;
 139         def = NULL;
 140
 141         if ((symbolic || abbrev_ref) && name) {
 142                 if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 143                         struct object_id discard;
 144                         char *full;
 145
 146                         switch (repo_dwim_ref(the_repository, name,
 147                                               strlen(name), &discard, &full,
 148                                               0)) {
 149                         case 0:
 150                                 /*
 151                                  * Not found -- not a ref.  We could
 152                                  * emit "name" here, but symbolic-full
 153                                  * users are interested in finding the
 154                                  * refs spelled in full, and they would
 155                                  * need to filter non-refs if we did so.
 156                                  */
 157                                 break;
 158                         case 1: /* happy */
 159                                 if (abbrev_ref) {
 160                                         char *old = full;
 161                                         full = shorten_unambiguous_ref(full,
 162                                                 abbrev_ref_strict);
 163                                         free(old);
 164                                 }
 165                                 show_with_type(type, full);
 166                                 break;
 167                         default: /* ambiguous */
 168                                 error("refname '%s' is ambiguous", name);
 169                                 break;
 170                         }
 171                         free(full);
 172                 } else {
 173                         show_with_type(type, name);
 174                 }
 175         }
 176         else if (abbrev)
 177                 show_with_type(type,
 178                                repo_find_unique_abbrev(the_repository, oid, abbrev));
 179         else
 180                 show_with_type(type, oid_to_hex(oid));
 181 }
 182
 183 /* Output a flag, only if filter allows it. */
 184 static int show_flag(const char *arg)
 185 {
 186         if (!(filter & DO_FLAGS))
 187                 return 0;
 188         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 189                 show(arg);
 190                 return 1;
 191         }
 192         return 0;
 193 }
 194
 195 static int show_default(void)
 196 {
 197         const char *s = def;
 198
 199         if (s) {
 200                 struct object_id oid;
 201
 202                 def = NULL;
 203                 if (!repo_get_oid(the_repository, s, &oid)) {
 204                         show_rev(NORMAL, &oid, s);
 205                         return 1;
 206                 }
 207         }
 208         return 0;
 209 }
 210
 211 static int show_reference(const char *refname, const struct object_id *oid,
 212                           int flag UNUSED, void *cb_data UNUSED)
 213 {
 214         if (ref_excluded(&ref_excludes, refname))
 215                 return 0;
 216         show_rev(NORMAL, oid, refname);
 217         return 0;
 218 }
 219
 220 static int anti_reference(const char *refname, const struct object_id *oid,
 221                           int flag UNUSED, void *cb_data UNUSED)
 222 {
 223         show_rev(REVERSED, oid, refname);
 224         return 0;
 225 }
 226
 227 static int show_abbrev(const struct object_id *oid, void *cb_data)
 228 {
 229         show_rev(NORMAL, oid, NULL);
 230         return 0;
 231 }
 232
 233 static void show_datestring(const char *flag, const char *datestr)
 234 {
 235         char *buffer;
 236
 237         /* date handling requires both flags and revs */
 238         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 239                 return;
 240         buffer = xstrfmt("%s%"PRItime, flag, approxidate(datestr));
 241         show(buffer);
 242         free(buffer);
 243 }
 244
 245 static int show_file(const char *arg, int output_prefix)
 246 {
 247         show_default();
 248         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 249                 if (output_prefix) {
 250                         const char *prefix = startup_info->prefix;
 251                         char *fname = prefix_filename(prefix, arg);
 252                         show(fname);
 253                         free(fname);
 254                 } else
 255                         show(arg);
 256                 return 1;
 257         }
 258         return 0;
 259 }
 260
 261 static int try_difference(const char *arg)
 262 {
 263         char *dotdot;
 264         struct object_id start_oid;
 265         struct object_id end_oid;
 266         const char *end;
 267         const char *start;
 268         int symmetric;
 269         static const char head_by_default[] = "HEAD";
 270
 271         if (!(dotdot = strstr(arg, "..")))
 272                 return 0;
 273         end = dotdot + 2;
 274         start = arg;
 275         symmetric = (*end == '.');
 276
 277         *dotdot = 0;
 278         end += symmetric;
 279
 280         if (!*end)
 281                 end = head_by_default;
 282         if (dotdot == arg)
 283                 start = head_by_default;
 284
 285         if (start == head_by_default && end == head_by_default &&
 286             !symmetric) {
 287                 /*
 288                  * Just ".."?  That is not a range but the
 289                  * pathspec for the parent directory.
 290                  */
 291                 *dotdot = '.';
 292                 return 0;
 293         }
 294
 295         if (!repo_get_oid_committish(the_repository, start, &start_oid) && !repo_get_oid_committish(the_repository, end, &end_oid)) {
 296                 show_rev(NORMAL, &end_oid, end);
 297                 show_rev(symmetric ? NORMAL : REVERSED, &start_oid, start);
 298                 if (symmetric) {
 299                         struct commit_list *exclude;
 300                         struct commit *a, *b;
 301                         a = lookup_commit_reference(the_repository, &start_oid);
 302                         b = lookup_commit_reference(the_repository, &end_oid);
 303                         if (!a || !b) {
 304                                 *dotdot = '.';
 305                                 return 0;
 306                         }
 307                         exclude = repo_get_merge_bases(the_repository, a, b);
 308                         while (exclude) {
 309                                 struct commit *commit = pop_commit(&exclude);
 310                                 show_rev(REVERSED, &commit->object.oid, NULL);
 311                         }
 312                 }
 313                 *dotdot = '.';
 314                 return 1;
 315         }
 316         *dotdot = '.';
 317         return 0;
 318 }
 319
 320 static int try_parent_shorthands(const char *arg)
 321 {
 322         char *dotdot;
 323         struct object_id oid;
 324         struct commit *commit;
 325         struct commit_list *parents;
 326         int parent_number;
 327         int include_rev = 0;
 328         int include_parents = 0;
 329         int exclude_parent = 0;
 330
 331         if ((dotdot = strstr(arg, "^!"))) {
 332                 include_rev = 1;
 333                 if (dotdot[2])
 334                         return 0;
 335         } else if ((dotdot = strstr(arg, "^@"))) {
 336                 include_parents = 1;
 337                 if (dotdot[2])
 338                         return 0;
 339         } else if ((dotdot = strstr(arg, "^-"))) {
 340                 include_rev = 1;
 341                 exclude_parent = 1;
 342
 343                 if (dotdot[2]) {
 344                         char *end;
 345                         exclude_parent = strtoul(dotdot + 2, &end, 10);
 346                         if (*end != '\0' || !exclude_parent)
 347                                 return 0;
 348                 }
 349         } else
 350                 return 0;
 351
 352         *dotdot = 0;
 353         if (repo_get_oid_committish(the_repository, arg, &oid) ||
 354             !(commit = lookup_commit_reference(the_repository, &oid))) {
 355                 *dotdot = '^';
 356                 return 0;
 357         }
 358
 359         if (exclude_parent &&
 360             exclude_parent > commit_list_count(commit->parents)) {
 361                 *dotdot = '^';
 362                 return 0;
 363         }
 364
 365         if (include_rev)
 366                 show_rev(NORMAL, &oid, arg);
 367         for (parents = commit->parents, parent_number = 1;
 368              parents;
 369              parents = parents->next, parent_number++) {
 370                 char *name = NULL;
 371
 372                 if (exclude_parent && parent_number != exclude_parent)
 373                         continue;
 374
 375                 if (symbolic)
 376                         name = xstrfmt("%s^%d", arg, parent_number);
 377                 show_rev(include_parents ? NORMAL : REVERSED,
 378                          &parents->item->object.oid, name);
 379                 free(name);
 380         }
 381
 382         *dotdot = '^';
 383         return 1;
 384 }
 385
 386 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 387 {
 388         struct strbuf *parsed = o->value;
 389         if (unset)
 390                 strbuf_addf(parsed, " --no-%s", o->long_name);
 391         else if (o->short_name && (o->long_name == NULL || !stuck_long))
 392                 strbuf_addf(parsed, " -%c", o->short_name);
 393         else
 394                 strbuf_addf(parsed, " --%s", o->long_name);
 395         if (arg) {
 396                 if (!stuck_long)
 397                         strbuf_addch(parsed, ' ');
 398                 else if (o->long_name)
 399                         strbuf_addch(parsed, '=');
 400                 sq_quote_buf(parsed, arg);
 401         }
 402         return 0;
 403 }
 404
 405 static const char *skipspaces(const char *s)
 406 {
 407         while (isspace(*s))
 408                 s++;
 409         return s;
 410 }
 411
 412 static char *findspace(const char *s)
 413 {
 414         for (; *s; s++)
 415                 if (isspace(*s))
 416                         return (char*)s;
 417         return NULL;
 418 }
 419
 420 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 421 {
 422         static int keep_dashdash = 0, stop_at_non_option = 0;
 423         static char const * const parseopt_usage[] = {
 424                 N_("git rev-parse --parseopt [<options>] -- [<args>...]"),
 425                 NULL
 426         };
 427         static struct option parseopt_opts[] = {
 428                 OPT_BOOL(0, "keep-dashdash", &keep_dashdash,
 429                                         N_("keep the `--` passed as an arg")),
 430                 OPT_BOOL(0, "stop-at-non-option", &stop_at_non_option,
 431                                         N_("stop parsing after the "
 432                                            "first non-option argument")),
 433                 OPT_BOOL(0, "stuck-long", &stuck_long,
 434                                         N_("output in stuck long form")),
 435                 OPT_END(),
 436         };
 437         static const char * const flag_chars = "*=?!";
 438
 439         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 440         const char **usage = NULL;
 441         struct option *opts = NULL;
 442         int onb = 0, osz = 0, unb = 0, usz = 0;
 443
 444         strbuf_addstr(&parsed, "set --");
 445         argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 446                              PARSE_OPT_KEEP_DASHDASH);
 447         if (argc < 1 || strcmp(argv[0], "--"))
 448                 usage_with_options(parseopt_usage, parseopt_opts);
 449
 450         /* get the usage up to the first line with a -- on it */
 451         for (;;) {
 452                 if (strbuf_getline(&sb, stdin) == EOF)
 453                         die(_("premature end of input"));
 454                 ALLOC_GROW(usage, unb + 1, usz);
 455                 if (!strcmp("--", sb.buf)) {
 456                         if (unb < 1)
 457                                 die(_("no usage string given before the `--' separator"));
 458                         usage[unb] = NULL;
 459                         break;
 460                 }
 461                 usage[unb++] = strbuf_detach(&sb, NULL);
 462         }
 463
 464         /* parse: (<short>|<short>,<long>|<long>)[*=?!]*<arghint>? SP+ <help> */
 465         while (strbuf_getline(&sb, stdin) != EOF) {
 466                 const char *s;
 467                 char *help;
 468                 struct option *o;
 469
 470                 if (!sb.len)
 471                         continue;
 472
 473                 ALLOC_GROW(opts, onb + 1, osz);
 474                 memset(opts + onb, 0, sizeof(opts[onb]));
 475
 476                 o = &opts[onb++];
 477                 help = findspace(sb.buf);
 478                 if (!help || sb.buf == help) {
 479                         o->type = OPTION_GROUP;
 480                         o->help = xstrdup(skipspaces(sb.buf));
 481                         continue;
 482                 }
 483
 484                 *help = '\0';
 485
 486                 o->type = OPTION_CALLBACK;
 487                 o->help = xstrdup(skipspaces(help+1));
 488                 o->value = &parsed;
 489                 o->flags = PARSE_OPT_NOARG;
 490                 o->callback = &parseopt_dump;
 491
 492                 /* name(s) */
 493                 s = strpbrk(sb.buf, flag_chars);
 494                 if (!s)
 495                         s = help;
 496
 497                 if (s == sb.buf)
 498                         die(_("missing opt-spec before option flags"));
 499
 500                 if (s - sb.buf == 1) /* short option only */
 501                         o->short_name = *sb.buf;
 502                 else if (sb.buf[1] != ',') /* long option only */
 503                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 504                 else {
 505                         o->short_name = *sb.buf;
 506                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 507                 }
 508
 509                 /* flags */
 510                 while (s < help) {
 511                         switch (*s++) {
 512                         case '=':
 513                                 o->flags &= ~PARSE_OPT_NOARG;
 514                                 continue;
 515                         case '?':
 516                                 o->flags &= ~PARSE_OPT_NOARG;
 517                                 o->flags |= PARSE_OPT_OPTARG;
 518                                 continue;
 519                         case '!':
 520                                 o->flags |= PARSE_OPT_NONEG;
 521                                 continue;
 522                         case '*':
 523                                 o->flags |= PARSE_OPT_HIDDEN;
 524                                 continue;
 525                         }
 526                         s--;
 527                         break;
 528                 }
 529
 530                 if (s < help)
 531                         o->argh = xmemdupz(s, help - s);
 532         }
 533         strbuf_release(&sb);
 534
 535         /* put an OPT_END() */
 536         ALLOC_GROW(opts, onb + 1, osz);
 537         memset(opts + onb, 0, sizeof(opts[onb]));
 538         argc = parse_options(argc, argv, prefix, opts, usage,
 539                         (keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0) |
 540                         (stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0) |
 541                         PARSE_OPT_SHELL_EVAL);
 542
 543         strbuf_addstr(&parsed, " --");
 544         sq_quote_argv(&parsed, argv);
 545         puts(parsed.buf);
 546         strbuf_release(&parsed);
 547         return 0;
 548 }
 549
 550 static int cmd_sq_quote(int argc, const char **argv)
 551 {
 552         struct strbuf buf = STRBUF_INIT;
 553
 554         if (argc)
 555                 sq_quote_argv(&buf, argv);
 556         printf("%s\n", buf.buf);
 557         strbuf_release(&buf);
 558
 559         return 0;
 560 }
 561
 562 static void die_no_single_rev(int quiet)
 563 {
 564         if (quiet)
 565                 exit(1);
 566         else
 567                 die(_("Needed a single revision"));
 568 }
 569
 570 static const char builtin_rev_parse_usage[] =
 571 N_("git rev-parse --parseopt [<options>] -- [<args>...]\n"
 572    "   or: git rev-parse --sq-quote [<arg>...]\n"
 573    "   or: git rev-parse [<options>] [<arg>...]\n"
 574    "\n"
 575    "Run \"git rev-parse --parseopt -h\" for more information on the first usage.");
 576
 577 /*
 578  * Parse "opt" or "opt=<value>", setting value respectively to either
 579  * NULL or the string after "=".
 580  */
 581 static int opt_with_value(const char *arg, const char *opt, const char **value)
 582 {
 583         if (skip_prefix(arg, opt, &arg)) {
 584                 if (!*arg) {
 585                         *value = NULL;
 586                         return 1;
 587                 }
 588                 if (*arg++ == '=') {
 589                         *value = arg;
 590                         return 1;
 591                 }
 592         }
 593         return 0;
 594 }
 595
 596 static void handle_ref_opt(const char *pattern, const char *prefix)
 597 {
 598         if (pattern)
 599                 for_each_glob_ref_in(show_reference, pattern, prefix, NULL);
 600         else
 601                 for_each_ref_in(prefix, show_reference, NULL);
 602         clear_ref_exclusions(&ref_excludes);
 603 }
 604
 605 enum format_type {
 606         /* We would like a relative path. */
 607         FORMAT_RELATIVE,
 608         /* We would like a canonical absolute path. */
 609         FORMAT_CANONICAL,
 610         /* We would like the default behavior. */
 611         FORMAT_DEFAULT,
 612 };
 613
 614 enum default_type {
 615         /* Our default is a relative path. */
 616         DEFAULT_RELATIVE,
 617         /* Our default is a relative path if there's a shared root. */
 618         DEFAULT_RELATIVE_IF_SHARED,
 619         /* Our default is a canonical absolute path. */
 620         DEFAULT_CANONICAL,
 621         /* Our default is not to modify the item. */
 622         DEFAULT_UNMODIFIED,
 623 };
 624
 625 static void print_path(const char *path, const char *prefix, enum format_type format, enum default_type def)
 626 {
 627         char *cwd = NULL;
 628         /*
 629          * We don't ever produce a relative path if prefix is NULL, so set the
 630          * prefix to the current directory so that we can produce a relative
 631          * path whenever possible.  If we're using RELATIVE_IF_SHARED mode, then
 632          * we want an absolute path unless the two share a common prefix, so don't
 633          * set it in that case, since doing so causes a relative path to always
 634          * be produced if possible.
 635          */
 636         if (!prefix && (format != FORMAT_DEFAULT || def != DEFAULT_RELATIVE_IF_SHARED))
 637                 prefix = cwd = xgetcwd();
 638         if (format == FORMAT_DEFAULT && def == DEFAULT_UNMODIFIED) {
 639                 puts(path);
 640         } else if (format == FORMAT_RELATIVE ||
 641                   (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE)) {
 642                 /*
 643                  * In order for relative_path to work as expected, we need to
 644                  * make sure that both paths are absolute paths.  If we don't,
 645                  * we can end up with an unexpected absolute path that the user
 646                  * didn't want.
 647                  */
 648                 struct strbuf buf = STRBUF_INIT, realbuf = STRBUF_INIT, prefixbuf = STRBUF_INIT;
 649                 if (!is_absolute_path(path)) {
 650                         strbuf_realpath_forgiving(&realbuf, path,  1);
 651                         path = realbuf.buf;
 652                 }
 653                 if (!is_absolute_path(prefix)) {
 654                         strbuf_realpath_forgiving(&prefixbuf, prefix, 1);
 655                         prefix = prefixbuf.buf;
 656                 }
 657                 puts(relative_path(path, prefix, &buf));
 658                 strbuf_release(&buf);
 659                 strbuf_release(&realbuf);
 660                 strbuf_release(&prefixbuf);
 661         } else if (format == FORMAT_DEFAULT && def == DEFAULT_RELATIVE_IF_SHARED) {
 662                 struct strbuf buf = STRBUF_INIT;
 663                 puts(relative_path(path, prefix, &buf));
 664                 strbuf_release(&buf);
 665         } else {
 666                 struct strbuf buf = STRBUF_INIT;
 667                 strbuf_realpath_forgiving(&buf, path, 1);
 668                 puts(buf.buf);
 669                 strbuf_release(&buf);
 670         }
 671         free(cwd);
 672 }
 673
 674 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 675 {
 676         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 677         int did_repo_setup = 0;
 678         int has_dashdash = 0;
 679         int output_prefix = 0;
 680         struct object_id oid;
 681         unsigned int flags = 0;
 682         const char *name = NULL;
 683         struct object_context unused;
 684         struct strbuf buf = STRBUF_INIT;
 685         const int hexsz = the_hash_algo->hexsz;
 686         int seen_end_of_options = 0;
 687         enum format_type format = FORMAT_DEFAULT;
 688
 689         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 690                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 691
 692         if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 693                 return cmd_sq_quote(argc - 2, argv + 2);
 694
 695         if (argc > 1 && !strcmp("-h", argv[1]))
 696                 usage(builtin_rev_parse_usage);
 697
 698         for (i = 1; i < argc; i++) {
 699                 if (!strcmp(argv[i], "--")) {
 700                         has_dashdash = 1;
 701                         break;
 702                 }
 703         }
 704
 705         /* No options; just report on whether we're in a git repo or not. */
 706         if (argc == 1) {
 707                 setup_git_directory();
 708                 git_config(git_default_config, NULL);
 709                 return 0;
 710         }
 711
 712         for (i = 1; i < argc; i++) {
 713                 const char *arg = argv[i];
 714
 715                 if (as_is) {
 716                         if (show_file(arg, output_prefix) && as_is < 2)
 717                                 verify_filename(prefix, arg, 0);
 718                         continue;
 719                 }
 720
 721                 if (!seen_end_of_options) {
 722                         if (!strcmp(arg, "--local-env-vars")) {
 723                                 int i;
 724                                 for (i = 0; local_repo_env[i]; i++)
 725                                         printf("%s\n", local_repo_env[i]);
 726                                 continue;
 727                         }
 728                         if (!strcmp(arg, "--resolve-git-dir")) {
 729                                 const char *gitdir = argv[++i];
 730                                 if (!gitdir)
 731                                         die(_("--resolve-git-dir requires an argument"));
 732                                 gitdir = resolve_gitdir(gitdir);
 733                                 if (!gitdir)
 734                                         die(_("not a gitdir '%s'"), argv[i]);
 735                                 puts(gitdir);
 736                                 continue;
 737                         }
 738                 }
 739
 740                 /* The rest of the options require a git repository. */
 741                 if (!did_repo_setup) {
 742                         prefix = setup_git_directory();
 743                         git_config(git_default_config, NULL);
 744                         did_repo_setup = 1;
 745
 746                         prepare_repo_settings(the_repository);
 747                         the_repository->settings.command_requires_full_index = 0;
 748                 }
 749
 750                 if (!strcmp(arg, "--")) {
 751                         as_is = 2;
 752                         /* Pass on the "--" if we show anything but files.. */
 753                         if (filter & (DO_FLAGS | DO_REVS))
 754                                 show_file(arg, 0);
 755                         continue;
 756                 }
 757
 758                 if (!seen_end_of_options && *arg == '-') {
 759                         if (!strcmp(arg, "--git-path")) {
 760                                 if (!argv[i + 1])
 761                                         die(_("--git-path requires an argument"));
 762                                 strbuf_reset(&buf);
 763                                 print_path(git_path("%s", argv[i + 1]), prefix,
 764                                                 format,
 765                                                 DEFAULT_RELATIVE_IF_SHARED);
 766                                 i++;
 767                                 continue;
 768                         }
 769                         if (!strcmp(arg,"-n")) {
 770                                 if (++i >= argc)
 771                                         die(_("-n requires an argument"));
 772                                 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 773                                         show(arg);
 774                                         show(argv[i]);
 775                                 }
 776                                 continue;
 777                         }
 778                         if (starts_with(arg, "-n")) {
 779                                 if ((filter & DO_FLAGS) && (filter & DO_REVS))
 780                                         show(arg);
 781                                 continue;
 782                         }
 783                         if (opt_with_value(arg, "--path-format", &arg)) {
 784                                 if (!arg)
 785                                         die(_("--path-format requires an argument"));
 786                                 if (!strcmp(arg, "absolute")) {
 787                                         format = FORMAT_CANONICAL;
 788                                 } else if (!strcmp(arg, "relative")) {
 789                                         format = FORMAT_RELATIVE;
 790                                 } else {
 791                                         die(_("unknown argument to --path-format: %s"), arg);
 792                                 }
 793                                 continue;
 794                         }
 795                         if (!strcmp(arg, "--default")) {
 796                                 def = argv[++i];
 797                                 if (!def)
 798                                         die(_("--default requires an argument"));
 799                                 continue;
 800                         }
 801                         if (!strcmp(arg, "--prefix")) {
 802                                 prefix = argv[++i];
 803                                 if (!prefix)
 804                                         die(_("--prefix requires an argument"));
 805                                 startup_info->prefix = prefix;
 806                                 output_prefix = 1;
 807                                 continue;
 808                         }
 809                         if (!strcmp(arg, "--revs-only")) {
 810                                 filter &= ~DO_NOREV;
 811                                 continue;
 812                         }
 813                         if (!strcmp(arg, "--no-revs")) {
 814                                 filter &= ~DO_REVS;
 815                                 continue;
 816                         }
 817                         if (!strcmp(arg, "--flags")) {
 818                                 filter &= ~DO_NONFLAGS;
 819                                 continue;
 820                         }
 821                         if (!strcmp(arg, "--no-flags")) {
 822                                 filter &= ~DO_FLAGS;
 823                                 continue;
 824                         }
 825                         if (!strcmp(arg, "--verify")) {
 826                                 filter &= ~(DO_FLAGS|DO_NOREV);
 827                                 verify = 1;
 828                                 continue;
 829                         }
 830                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 831                                 quiet = 1;
 832                                 flags |= GET_OID_QUIETLY;
 833                                 continue;
 834                         }
 835                         if (opt_with_value(arg, "--short", &arg)) {
 836                                 filter &= ~(DO_FLAGS|DO_NOREV);
 837                                 verify = 1;
 838                                 abbrev = DEFAULT_ABBREV;
 839                                 if (!arg)
 840                                         continue;
 841                                 abbrev = strtoul(arg, NULL, 10);
 842                                 if (abbrev < MINIMUM_ABBREV)
 843                                         abbrev = MINIMUM_ABBREV;
 844                                 else if (hexsz <= abbrev)
 845                                         abbrev = hexsz;
 846                                 continue;
 847                         }
 848                         if (!strcmp(arg, "--sq")) {
 849                                 output_sq = 1;
 850                                 continue;
 851                         }
 852                         if (!strcmp(arg, "--not")) {
 853                                 show_type ^= REVERSED;
 854                                 continue;
 855                         }
 856                         if (!strcmp(arg, "--symbolic")) {
 857                                 symbolic = SHOW_SYMBOLIC_ASIS;
 858                                 continue;
 859                         }
 860                         if (!strcmp(arg, "--symbolic-full-name")) {
 861                                 symbolic = SHOW_SYMBOLIC_FULL;
 862                                 continue;
 863                         }
 864                         if (opt_with_value(arg, "--abbrev-ref", &arg)) {
 865                                 abbrev_ref = 1;
 866                                 abbrev_ref_strict = warn_ambiguous_refs;
 867                                 if (arg) {
 868                                         if (!strcmp(arg, "strict"))
 869                                                 abbrev_ref_strict = 1;
 870                                         else if (!strcmp(arg, "loose"))
 871                                                 abbrev_ref_strict = 0;
 872                                         else
 873                                                 die(_("unknown mode for --abbrev-ref: %s"),
 874                                                     arg);
 875                                 }
 876                                 continue;
 877                         }
 878                         if (!strcmp(arg, "--all")) {
 879                                 for_each_ref(show_reference, NULL);
 880                                 clear_ref_exclusions(&ref_excludes);
 881                                 continue;
 882                         }
 883                         if (skip_prefix(arg, "--disambiguate=", &arg)) {
 884                                 repo_for_each_abbrev(the_repository, arg,
 885                                                      show_abbrev, NULL);
 886                                 continue;
 887                         }
 888                         if (!strcmp(arg, "--bisect")) {
 889                                 for_each_fullref_in("refs/bisect/bad", show_reference, NULL);
 890                                 for_each_fullref_in("refs/bisect/good", anti_reference, NULL);
 891                                 continue;
 892                         }
 893                         if (opt_with_value(arg, "--branches", &arg)) {
 894                                 if (ref_excludes.hidden_refs_configured)
 895                                         return error(_("--exclude-hidden cannot be used together with --branches"));
 896                                 handle_ref_opt(arg, "refs/heads/");
 897                                 continue;
 898                         }
 899                         if (opt_with_value(arg, "--tags", &arg)) {
 900                                 if (ref_excludes.hidden_refs_configured)
 901                                         return error(_("--exclude-hidden cannot be used together with --tags"));
 902                                 handle_ref_opt(arg, "refs/tags/");
 903                                 continue;
 904                         }
 905                         if (skip_prefix(arg, "--glob=", &arg)) {
 906                                 handle_ref_opt(arg, NULL);
 907                                 continue;
 908                         }
 909                         if (opt_with_value(arg, "--remotes", &arg)) {
 910                                 if (ref_excludes.hidden_refs_configured)
 911                                         return error(_("--exclude-hidden cannot be used together with --remotes"));
 912                                 handle_ref_opt(arg, "refs/remotes/");
 913                                 continue;
 914                         }
 915                         if (skip_prefix(arg, "--exclude=", &arg)) {
 916                                 add_ref_exclusion(&ref_excludes, arg);
 917                                 continue;
 918                         }
 919                         if (skip_prefix(arg, "--exclude-hidden=", &arg)) {
 920                                 exclude_hidden_refs(&ref_excludes, arg);
 921                                 continue;
 922                         }
 923                         if (!strcmp(arg, "--show-toplevel")) {
 924                                 const char *work_tree = get_git_work_tree();
 925                                 if (work_tree)
 926                                         print_path(work_tree, prefix, format, DEFAULT_UNMODIFIED);
 927                                 else
 928                                         die(_("this operation must be run in a work tree"));
 929                                 continue;
 930                         }
 931                         if (!strcmp(arg, "--show-superproject-working-tree")) {
 932                                 struct strbuf superproject = STRBUF_INIT;
 933                                 if (get_superproject_working_tree(&superproject))
 934                                         print_path(superproject.buf, prefix, format, DEFAULT_UNMODIFIED);
 935                                 strbuf_release(&superproject);
 936                                 continue;
 937                         }
 938                         if (!strcmp(arg, "--show-prefix")) {
 939                                 if (prefix)
 940                                         puts(prefix);
 941                                 else
 942                                         putchar('\n');
 943                                 continue;
 944                         }
 945                         if (!strcmp(arg, "--show-cdup")) {
 946                                 const char *pfx = prefix;
 947                                 if (!is_inside_work_tree()) {
 948                                         const char *work_tree =
 949                                                 get_git_work_tree();
 950                                         if (work_tree)
 951                                                 printf("%s\n", work_tree);
 952                                         continue;
 953                                 }
 954                                 while (pfx) {
 955                                         pfx = strchr(pfx, '/');
 956                                         if (pfx) {
 957                                                 pfx++;
 958                                                 printf("../");
 959                                         }
 960                                 }
 961                                 putchar('\n');
 962                                 continue;
 963                         }
 964                         if (!strcmp(arg, "--git-dir") ||
 965                             !strcmp(arg, "--absolute-git-dir")) {
 966                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 967                                 char *cwd;
 968                                 int len;
 969                                 enum format_type wanted = format;
 970                                 if (arg[2] == 'g') {    /* --git-dir */
 971                                         if (gitdir) {
 972                                                 print_path(gitdir, prefix, format, DEFAULT_UNMODIFIED);
 973                                                 continue;
 974                                         }
 975                                         if (!prefix) {
 976                                                 print_path(".git", prefix, format, DEFAULT_UNMODIFIED);
 977                                                 continue;
 978                                         }
 979                                 } else {                /* --absolute-git-dir */
 980                                         wanted = FORMAT_CANONICAL;
 981                                         if (!gitdir && !prefix)
 982                                                 gitdir = ".git";
 983                                         if (gitdir) {
 984                                                 struct strbuf realpath = STRBUF_INIT;
 985                                                 strbuf_realpath(&realpath, gitdir, 1);
 986                                                 puts(realpath.buf);
 987                                                 strbuf_release(&realpath);
 988                                                 continue;
 989                                         }
 990                                 }
 991                                 cwd = xgetcwd();
 992                                 len = strlen(cwd);
 993                                 strbuf_reset(&buf);
 994                                 strbuf_addf(&buf, "%s%s.git", cwd, len && cwd[len-1] != '/' ? "/" : "");
 995                                 free(cwd);
 996                                 print_path(buf.buf, prefix, wanted, DEFAULT_CANONICAL);
 997                                 continue;
 998                         }
 999                         if (!strcmp(arg, "--git-common-dir")) {
1000                                 print_path(get_git_common_dir(), prefix, format, DEFAULT_RELATIVE_IF_SHARED);
1001                                 continue;
1002                         }
1003                         if (!strcmp(arg, "--is-inside-git-dir")) {
1004                                 printf("%s\n", is_inside_git_dir() ? "true"
1005                                                 : "false");
1006                                 continue;
1007                         }
1008                         if (!strcmp(arg, "--is-inside-work-tree")) {
1009                                 printf("%s\n", is_inside_work_tree() ? "true"
1010                                                 : "false");
1011                                 continue;
1012                         }
1013                         if (!strcmp(arg, "--is-bare-repository")) {
1014                                 printf("%s\n", is_bare_repository() ? "true"
1015                                                 : "false");
1016                                 continue;
1017                         }
1018                         if (!strcmp(arg, "--is-shallow-repository")) {
1019                                 printf("%s\n",
1020                                                 is_repository_shallow(the_repository) ? "true"
1021                                                 : "false");
1022                                 continue;
1023                         }
1024                         if (!strcmp(arg, "--shared-index-path")) {
1025                                 if (repo_read_index(the_repository) < 0)
1026                                         die(_("Could not read the index"));
1027                                 if (the_index.split_index) {
1028                                         const struct object_id *oid = &the_index.split_index->base_oid;
1029                                         const char *path = git_path("sharedindex.%s", oid_to_hex(oid));
1030                                         print_path(path, prefix, format, DEFAULT_RELATIVE);
1031                                 }
1032                                 continue;
1033                         }
1034                         if (skip_prefix(arg, "--since=", &arg)) {
1035                                 show_datestring("--max-age=", arg);
1036                                 continue;
1037                         }
1038                         if (skip_prefix(arg, "--after=", &arg)) {
1039                                 show_datestring("--max-age=", arg);
1040                                 continue;
1041                         }
1042                         if (skip_prefix(arg, "--before=", &arg)) {
1043                                 show_datestring("--min-age=", arg);
1044                                 continue;
1045                         }
1046                         if (skip_prefix(arg, "--until=", &arg)) {
1047                                 show_datestring("--min-age=", arg);
1048                                 continue;
1049                         }
1050                         if (opt_with_value(arg, "--show-object-format", &arg)) {
1051                                 const char *val = arg ? arg : "storage";
1052
1053                                 if (strcmp(val, "storage") &&
1054                                     strcmp(val, "input") &&
1055                                     strcmp(val, "output"))
1056                                         die(_("unknown mode for --show-object-format: %s"),
1057                                             arg);
1058                                 puts(the_hash_algo->name);
1059                                 continue;
1060                         }
1061                         if (!strcmp(arg, "--end-of-options")) {
1062                                 seen_end_of_options = 1;
1063                                 if (filter & (DO_FLAGS | DO_REVS))
1064                                         show_file(arg, 0);
1065                                 continue;
1066                         }
1067                         if (show_flag(arg) && verify)
1068                                 die_no_single_rev(quiet);
1069                         continue;
1070                 }
1071
1072                 /* Not a flag argument */
1073                 if (try_difference(arg))
1074                         continue;
1075                 if (try_parent_shorthands(arg))
1076                         continue;
1077                 name = arg;
1078                 type = NORMAL;
1079                 if (*arg == '^') {
1080                         name++;
1081                         type = REVERSED;
1082                 }
1083                 if (!get_oid_with_context(the_repository, name,
1084                                           flags, &oid, &unused)) {
1085                         if (verify)
1086                                 revs_count++;
1087                         else
1088                                 show_rev(type, &oid, name);
1089                         continue;
1090                 }
1091                 if (verify)
1092                         die_no_single_rev(quiet);
1093                 if (has_dashdash)
1094                         die(_("bad revision '%s'"), arg);
1095                 as_is = 1;
1096                 if (!show_file(arg, output_prefix))
1097                         continue;
1098                 verify_filename(prefix, arg, 1);
1099         }
1100         strbuf_release(&buf);
1101         if (verify) {
1102                 if (revs_count == 1) {
1103                         show_rev(type, &oid, name);
1104                         return 0;
1105                 } else if (revs_count == 0 && show_default())
1106                         return 0;
1107                 die_no_single_rev(quiet);
1108         } else
1109                 show_default();
1110         return 0;
1111 }