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