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 output_sq;
  30
  31 /*
  32  * Some arguments are relevant "revision" arguments,
  33  * others are about output format or other details.
  34  * This sorts it all out.
  35  */
  36 static int is_rev_argument(const char *arg)
  37 {
  38         static const char *rev_args[] = {
  39                 "--all",
  40                 "--bisect",
  41                 "--dense",
  42                 "--branches",
  43                 "--header",
  44                 "--max-age=",
  45                 "--max-count=",
  46                 "--min-age=",
  47                 "--no-merges",
  48                 "--objects",
  49                 "--objects-edge",
  50                 "--parents",
  51                 "--pretty",
  52                 "--remotes",
  53                 "--sparse",
  54                 "--tags",
  55                 "--topo-order",
  56                 "--date-order",
  57                 "--unpacked",
  58                 NULL
  59         };
  60         const char **p = rev_args;
  61
  62         /* accept -<digit>, like traditional "head" */
  63         if ((*arg == '-') && isdigit(arg[1]))
  64                 return 1;
  65
  66         for (;;) {
  67                 const char *str = *p++;
  68                 int len;
  69                 if (!str)
  70                         return 0;
  71                 len = strlen(str);
  72                 if (!strcmp(arg, str) ||
  73                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  74                         return 1;
  75         }
  76 }
  77
  78 /* Output argument as a string, either SQ or normal */
  79 static void show(const char *arg)
  80 {
  81         if (output_sq) {
  82                 int sq = '\'', ch;
  83
  84                 putchar(sq);
  85                 while ((ch = *arg++)) {
  86                         if (ch == sq)
  87                                 fputs("'\\'", stdout);
  88                         putchar(ch);
  89                 }
  90                 putchar(sq);
  91                 putchar(' ');
  92         }
  93         else
  94                 puts(arg);
  95 }
  96
  97 /* Like show(), but with a negation prefix according to type */
  98 static void show_with_type(int type, const char *arg)
  99 {
 100         if (type != show_type)
 101                 putchar('^');
 102         show(arg);
 103 }
 104
 105 /* Output a revision, only if filter allows it */
 106 static void show_rev(int type, const unsigned char *sha1, const char *name)
 107 {
 108         if (!(filter & DO_REVS))
 109                 return;
 110         def = NULL;
 111
 112         if (symbolic && name) {
 113                 if (symbolic == SHOW_SYMBOLIC_FULL) {
 114                         unsigned char discard[20];
 115                         char *full;
 116
 117                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 118                         case 0:
 119                                 /*
 120                                  * Not found -- not a ref.  We could
 121                                  * emit "name" here, but symbolic-full
 122                                  * users are interested in finding the
 123                                  * refs spelled in full, and they would
 124                                  * need to filter non-refs if we did so.
 125                                  */
 126                                 break;
 127                         case 1: /* happy */
 128                                 show_with_type(type, full);
 129                                 break;
 130                         default: /* ambiguous */
 131                                 error("refname '%s' is ambiguous", name);
 132                                 break;
 133                         }
 134                 } else {
 135                         show_with_type(type, name);
 136                 }
 137         }
 138         else if (abbrev)
 139                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 140         else
 141                 show_with_type(type, sha1_to_hex(sha1));
 142 }
 143
 144 /* Output a flag, only if filter allows it. */
 145 static int show_flag(const char *arg)
 146 {
 147         if (!(filter & DO_FLAGS))
 148                 return 0;
 149         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 150                 show(arg);
 151                 return 1;
 152         }
 153         return 0;
 154 }
 155
 156 static int show_default(void)
 157 {
 158         const char *s = def;
 159
 160         if (s) {
 161                 unsigned char sha1[20];
 162
 163                 def = NULL;
 164                 if (!get_sha1(s, sha1)) {
 165                         show_rev(NORMAL, sha1, s);
 166                         return 1;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 173 {
 174         show_rev(NORMAL, sha1, refname);
 175         return 0;
 176 }
 177
 178 static void show_datestring(const char *flag, const char *datestr)
 179 {
 180         static char buffer[100];
 181
 182         /* date handling requires both flags and revs */
 183         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 184                 return;
 185         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 186         show(buffer);
 187 }
 188
 189 static int show_file(const char *arg)
 190 {
 191         show_default();
 192         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 193                 show(arg);
 194                 return 1;
 195         }
 196         return 0;
 197 }
 198
 199 static int try_difference(const char *arg)
 200 {
 201         char *dotdot;
 202         unsigned char sha1[20];
 203         unsigned char end[20];
 204         const char *next;
 205         const char *this;
 206         int symmetric;
 207
 208         if (!(dotdot = strstr(arg, "..")))
 209                 return 0;
 210         next = dotdot + 2;
 211         this = arg;
 212         symmetric = (*next == '.');
 213
 214         *dotdot = 0;
 215         next += symmetric;
 216
 217         if (!*next)
 218                 next = "HEAD";
 219         if (dotdot == arg)
 220                 this = "HEAD";
 221         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 222                 show_rev(NORMAL, end, next);
 223                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 224                 if (symmetric) {
 225                         struct commit_list *exclude;
 226                         struct commit *a, *b;
 227                         a = lookup_commit_reference(sha1);
 228                         b = lookup_commit_reference(end);
 229                         exclude = get_merge_bases(a, b, 1);
 230                         while (exclude) {
 231                                 struct commit_list *n = exclude->next;
 232                                 show_rev(REVERSED,
 233                                          exclude->item->object.sha1,NULL);
 234                                 free(exclude);
 235                                 exclude = n;
 236                         }
 237                 }
 238                 return 1;
 239         }
 240         *dotdot = '.';
 241         return 0;
 242 }
 243
 244 static int try_parent_shorthands(const char *arg)
 245 {
 246         char *dotdot;
 247         unsigned char sha1[20];
 248         struct commit *commit;
 249         struct commit_list *parents;
 250         int parents_only;
 251
 252         if ((dotdot = strstr(arg, "^!")))
 253                 parents_only = 0;
 254         else if ((dotdot = strstr(arg, "^@")))
 255                 parents_only = 1;
 256
 257         if (!dotdot || dotdot[2])
 258                 return 0;
 259
 260         *dotdot = 0;
 261         if (get_sha1(arg, sha1))
 262                 return 0;
 263
 264         if (!parents_only)
 265                 show_rev(NORMAL, sha1, arg);
 266         commit = lookup_commit_reference(sha1);
 267         for (parents = commit->parents; parents; parents = parents->next)
 268                 show_rev(parents_only ? NORMAL : REVERSED,
 269                                 parents->item->object.sha1, arg);
 270
 271         return 1;
 272 }
 273
 274 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 275 {
 276         struct strbuf *parsed = o->value;
 277         if (unset)
 278                 strbuf_addf(parsed, " --no-%s", o->long_name);
 279         else if (o->short_name)
 280                 strbuf_addf(parsed, " -%c", o->short_name);
 281         else
 282                 strbuf_addf(parsed, " --%s", o->long_name);
 283         if (arg) {
 284                 strbuf_addch(parsed, ' ');
 285                 sq_quote_buf(parsed, arg);
 286         }
 287         return 0;
 288 }
 289
 290 static const char *skipspaces(const char *s)
 291 {
 292         while (isspace(*s))
 293                 s++;
 294         return s;
 295 }
 296
 297 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 298 {
 299         static int keep_dashdash = 0;
 300         static char const * const parseopt_usage[] = {
 301                 "git rev-parse --parseopt [options] -- [<args>...]",
 302                 NULL
 303         };
 304         static struct option parseopt_opts[] = {
 305                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 306                                         "keep the `--` passed as an arg"),
 307                 OPT_END(),
 308         };
 309
 310         struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 311         const char **usage = NULL;
 312         struct option *opts = NULL;
 313         int onb = 0, osz = 0, unb = 0, usz = 0;
 314
 315         strbuf_addstr(&parsed, "set --");
 316         argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
 317                              PARSE_OPT_KEEP_DASHDASH);
 318         if (argc < 1 || strcmp(argv[0], "--"))
 319                 usage_with_options(parseopt_usage, parseopt_opts);
 320
 321         /* get the usage up to the first line with a -- on it */
 322         for (;;) {
 323                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 324                         die("premature end of input");
 325                 ALLOC_GROW(usage, unb + 1, usz);
 326                 if (!strcmp("--", sb.buf)) {
 327                         if (unb < 1)
 328                                 die("no usage string given before the `--' separator");
 329                         usage[unb] = NULL;
 330                         break;
 331                 }
 332                 usage[unb++] = strbuf_detach(&sb, NULL);
 333         }
 334
 335         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 336         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 337                 const char *s;
 338                 struct option *o;
 339
 340                 if (!sb.len)
 341                         continue;
 342
 343                 ALLOC_GROW(opts, onb + 1, osz);
 344                 memset(opts + onb, 0, sizeof(opts[onb]));
 345
 346                 o = &opts[onb++];
 347                 s = strchr(sb.buf, ' ');
 348                 if (!s || *sb.buf == ' ') {
 349                         o->type = OPTION_GROUP;
 350                         o->help = xstrdup(skipspaces(sb.buf));
 351                         continue;
 352                 }
 353
 354                 o->type = OPTION_CALLBACK;
 355                 o->help = xstrdup(skipspaces(s));
 356                 o->value = &parsed;
 357                 o->flags = PARSE_OPT_NOARG;
 358                 o->callback = &parseopt_dump;
 359                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 360                         switch (*--s) {
 361                         case '=':
 362                                 o->flags &= ~PARSE_OPT_NOARG;
 363                                 break;
 364                         case '?':
 365                                 o->flags &= ~PARSE_OPT_NOARG;
 366                                 o->flags |= PARSE_OPT_OPTARG;
 367                                 break;
 368                         case '!':
 369                                 o->flags |= PARSE_OPT_NONEG;
 370                                 break;
 371                         case '*':
 372                                 o->flags |= PARSE_OPT_HIDDEN;
 373                                 break;
 374                         }
 375                 }
 376
 377                 if (s - sb.buf == 1) /* short option only */
 378                         o->short_name = *sb.buf;
 379                 else if (sb.buf[1] != ',') /* long option only */
 380                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 381                 else {
 382                         o->short_name = *sb.buf;
 383                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 384                 }
 385         }
 386         strbuf_release(&sb);
 387
 388         /* put an OPT_END() */
 389         ALLOC_GROW(opts, onb + 1, osz);
 390         memset(opts + onb, 0, sizeof(opts[onb]));
 391         argc = parse_options(argc, argv, opts, usage,
 392                              keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
 393
 394         strbuf_addf(&parsed, " --");
 395         sq_quote_argv(&parsed, argv, 0);
 396         puts(parsed.buf);
 397         return 0;
 398 }
 399
 400 static void die_no_single_rev(int quiet)
 401 {
 402         if (quiet)
 403                 exit(1);
 404         else
 405                 die("Needed a single revision");
 406 }
 407
 408 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 409 {
 410         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 411         unsigned char sha1[20];
 412         const char *name = NULL;
 413
 414         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 415                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 416
 417         prefix = setup_git_directory();
 418         git_config(git_default_config, NULL);
 419         for (i = 1; i < argc; i++) {
 420                 const char *arg = argv[i];
 421
 422                 if (as_is) {
 423                         if (show_file(arg) && as_is < 2)
 424                                 verify_filename(prefix, arg);
 425                         continue;
 426                 }
 427                 if (!strcmp(arg,"-n")) {
 428                         if (++i >= argc)
 429                                 die("-n requires an argument");
 430                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 431                                 show(arg);
 432                                 show(argv[i]);
 433                         }
 434                         continue;
 435                 }
 436                 if (!prefixcmp(arg, "-n")) {
 437                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 438                                 show(arg);
 439                         continue;
 440                 }
 441
 442                 if (*arg == '-') {
 443                         if (!strcmp(arg, "--")) {
 444                                 as_is = 2;
 445                                 /* Pass on the "--" if we show anything but files.. */
 446                                 if (filter & (DO_FLAGS | DO_REVS))
 447                                         show_file(arg);
 448                                 continue;
 449                         }
 450                         if (!strcmp(arg, "--default")) {
 451                                 def = argv[i+1];
 452                                 i++;
 453                                 continue;
 454                         }
 455                         if (!strcmp(arg, "--revs-only")) {
 456                                 filter &= ~DO_NOREV;
 457                                 continue;
 458                         }
 459                         if (!strcmp(arg, "--no-revs")) {
 460                                 filter &= ~DO_REVS;
 461                                 continue;
 462                         }
 463                         if (!strcmp(arg, "--flags")) {
 464                                 filter &= ~DO_NONFLAGS;
 465                                 continue;
 466                         }
 467                         if (!strcmp(arg, "--no-flags")) {
 468                                 filter &= ~DO_FLAGS;
 469                                 continue;
 470                         }
 471                         if (!strcmp(arg, "--verify")) {
 472                                 filter &= ~(DO_FLAGS|DO_NOREV);
 473                                 verify = 1;
 474                                 continue;
 475                         }
 476                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 477                                 quiet = 1;
 478                                 continue;
 479                         }
 480                         if (!strcmp(arg, "--short") ||
 481                             !prefixcmp(arg, "--short=")) {
 482                                 filter &= ~(DO_FLAGS|DO_NOREV);
 483                                 verify = 1;
 484                                 abbrev = DEFAULT_ABBREV;
 485                                 if (arg[7] == '=')
 486                                         abbrev = strtoul(arg + 8, NULL, 10);
 487                                 if (abbrev < MINIMUM_ABBREV)
 488                                         abbrev = MINIMUM_ABBREV;
 489                                 else if (40 <= abbrev)
 490                                         abbrev = 40;
 491                                 continue;
 492                         }
 493                         if (!strcmp(arg, "--sq")) {
 494                                 output_sq = 1;
 495                                 continue;
 496                         }
 497                         if (!strcmp(arg, "--not")) {
 498                                 show_type ^= REVERSED;
 499                                 continue;
 500                         }
 501                         if (!strcmp(arg, "--symbolic")) {
 502                                 symbolic = SHOW_SYMBOLIC_ASIS;
 503                                 continue;
 504                         }
 505                         if (!strcmp(arg, "--symbolic-full-name")) {
 506                                 symbolic = SHOW_SYMBOLIC_FULL;
 507                                 continue;
 508                         }
 509                         if (!strcmp(arg, "--all")) {
 510                                 for_each_ref(show_reference, NULL);
 511                                 continue;
 512                         }
 513                         if (!strcmp(arg, "--branches")) {
 514                                 for_each_branch_ref(show_reference, NULL);
 515                                 continue;
 516                         }
 517                         if (!strcmp(arg, "--tags")) {
 518                                 for_each_tag_ref(show_reference, NULL);
 519                                 continue;
 520                         }
 521                         if (!strcmp(arg, "--remotes")) {
 522                                 for_each_remote_ref(show_reference, NULL);
 523                                 continue;
 524                         }
 525                         if (!strcmp(arg, "--show-prefix")) {
 526                                 if (prefix)
 527                                         puts(prefix);
 528                                 continue;
 529                         }
 530                         if (!strcmp(arg, "--show-cdup")) {
 531                                 const char *pfx = prefix;
 532                                 if (!is_inside_work_tree()) {
 533                                         const char *work_tree =
 534                                                 get_git_work_tree();
 535                                         if (work_tree)
 536                                                 printf("%s\n", work_tree);
 537                                         continue;
 538                                 }
 539                                 while (pfx) {
 540                                         pfx = strchr(pfx, '/');
 541                                         if (pfx) {
 542                                                 pfx++;
 543                                                 printf("../");
 544                                         }
 545                                 }
 546                                 putchar('\n');
 547                                 continue;
 548                         }
 549                         if (!strcmp(arg, "--git-dir")) {
 550                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 551                                 static char cwd[PATH_MAX];
 552                                 if (gitdir) {
 553                                         puts(gitdir);
 554                                         continue;
 555                                 }
 556                                 if (!prefix) {
 557                                         puts(".git");
 558                                         continue;
 559                                 }
 560                                 if (!getcwd(cwd, PATH_MAX))
 561                                         die("unable to get current working directory");
 562                                 printf("%s/.git\n", cwd);
 563                                 continue;
 564                         }
 565                         if (!strcmp(arg, "--is-inside-git-dir")) {
 566                                 printf("%s\n", is_inside_git_dir() ? "true"
 567                                                 : "false");
 568                                 continue;
 569                         }
 570                         if (!strcmp(arg, "--is-inside-work-tree")) {
 571                                 printf("%s\n", is_inside_work_tree() ? "true"
 572                                                 : "false");
 573                                 continue;
 574                         }
 575                         if (!strcmp(arg, "--is-bare-repository")) {
 576                                 printf("%s\n", is_bare_repository() ? "true"
 577                                                 : "false");
 578                                 continue;
 579                         }
 580                         if (!prefixcmp(arg, "--since=")) {
 581                                 show_datestring("--max-age=", arg+8);
 582                                 continue;
 583                         }
 584                         if (!prefixcmp(arg, "--after=")) {
 585                                 show_datestring("--max-age=", arg+8);
 586                                 continue;
 587                         }
 588                         if (!prefixcmp(arg, "--before=")) {
 589                                 show_datestring("--min-age=", arg+9);
 590                                 continue;
 591                         }
 592                         if (!prefixcmp(arg, "--until=")) {
 593                                 show_datestring("--min-age=", arg+8);
 594                                 continue;
 595                         }
 596                         if (show_flag(arg) && verify)
 597                                 die_no_single_rev(quiet);
 598                         continue;
 599                 }
 600
 601                 /* Not a flag argument */
 602                 if (try_difference(arg))
 603                         continue;
 604                 if (try_parent_shorthands(arg))
 605                         continue;
 606                 name = arg;
 607                 type = NORMAL;
 608                 if (*arg == '^') {
 609                         name++;
 610                         type = REVERSED;
 611                 }
 612                 if (!get_sha1(name, sha1)) {
 613                         if (verify)
 614                                 revs_count++;
 615                         else
 616                                 show_rev(type, sha1, name);
 617                         continue;
 618                 }
 619                 if (verify)
 620                         die_no_single_rev(quiet);
 621                 as_is = 1;
 622                 if (!show_file(arg))
 623                         continue;
 624                 verify_filename(prefix, arg);
 625         }
 626         if (verify) {
 627                 if (revs_count == 1) {
 628                         show_rev(type, sha1, name);
 629                         return 0;
 630                 } else if (revs_count == 0 && show_default())
 631                         return 0;
 632                 die_no_single_rev(quiet);
 633         } else
 634                 show_default();
 635         return 0;
 636 }