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