builtin/grep.c

   1 /*
   2  * Builtin "git grep"
   3  *
   4  * Copyright (c) 2006 Junio C Hamano
   5  */
   6 #include "cache.h"
   7 #include "blob.h"
   8 #include "tree.h"
   9 #include "commit.h"
  10 #include "tag.h"
  11 #include "tree-walk.h"
  12 #include "builtin.h"
  13 #include "parse-options.h"
  14 #include "string-list.h"
  15 #include "run-command.h"
  16 #include "userdiff.h"
  17 #include "grep.h"
  18 #include "quote.h"
  19 #include "dir.h"
  20
  21 static char const * const grep_usage[] = {
  22         N_("git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]"),
  23         NULL
  24 };
  25
  26 static int use_threads = 1;
  27
  28 #ifndef NO_PTHREADS
  29 #define THREADS 8
  30 static pthread_t threads[THREADS];
  31
  32 /* We use one producer thread and THREADS consumer
  33  * threads. The producer adds struct work_items to 'todo' and the
  34  * consumers pick work items from the same array.
  35  */
  36 struct work_item {
  37         struct grep_source source;
  38         char done;
  39         struct strbuf out;
  40 };
  41
  42 /* In the range [todo_done, todo_start) in 'todo' we have work_items
  43  * that have been or are processed by a consumer thread. We haven't
  44  * written the result for these to stdout yet.
  45  *
  46  * The work_items in [todo_start, todo_end) are waiting to be picked
  47  * up by a consumer thread.
  48  *
  49  * The ranges are modulo TODO_SIZE.
  50  */
  51 #define TODO_SIZE 128
  52 static struct work_item todo[TODO_SIZE];
  53 static int todo_start;
  54 static int todo_end;
  55 static int todo_done;
  56
  57 /* Has all work items been added? */
  58 static int all_work_added;
  59
  60 /* This lock protects all the variables above. */
  61 static pthread_mutex_t grep_mutex;
  62
  63 static inline void grep_lock(void)
  64 {
  65         if (use_threads)
  66                 pthread_mutex_lock(&grep_mutex);
  67 }
  68
  69 static inline void grep_unlock(void)
  70 {
  71         if (use_threads)
  72                 pthread_mutex_unlock(&grep_mutex);
  73 }
  74
  75 /* Signalled when a new work_item is added to todo. */
  76 static pthread_cond_t cond_add;
  77
  78 /* Signalled when the result from one work_item is written to
  79  * stdout.
  80  */
  81 static pthread_cond_t cond_write;
  82
  83 /* Signalled when we are finished with everything. */
  84 static pthread_cond_t cond_result;
  85
  86 static int skip_first_line;
  87
  88 static void add_work(struct grep_opt *opt, enum grep_source_type type,
  89                      const char *name, const void *id)
  90 {
  91         grep_lock();
  92
  93         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
  94                 pthread_cond_wait(&cond_write, &grep_mutex);
  95         }
  96
  97         grep_source_init(&todo[todo_end].source, type, name, id);
  98         if (opt->binary != GREP_BINARY_TEXT)
  99                 grep_source_load_driver(&todo[todo_end].source);
 100         todo[todo_end].done = 0;
 101         strbuf_reset(&todo[todo_end].out);
 102         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
 103
 104         pthread_cond_signal(&cond_add);
 105         grep_unlock();
 106 }
 107
 108 static struct work_item *get_work(void)
 109 {
 110         struct work_item *ret;
 111
 112         grep_lock();
 113         while (todo_start == todo_end && !all_work_added) {
 114                 pthread_cond_wait(&cond_add, &grep_mutex);
 115         }
 116
 117         if (todo_start == todo_end && all_work_added) {
 118                 ret = NULL;
 119         } else {
 120                 ret = &todo[todo_start];
 121                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
 122         }
 123         grep_unlock();
 124         return ret;
 125 }
 126
 127 static void work_done(struct work_item *w)
 128 {
 129         int old_done;
 130
 131         grep_lock();
 132         w->done = 1;
 133         old_done = todo_done;
 134         for(; todo[todo_done].done && todo_done != todo_start;
 135             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
 136                 w = &todo[todo_done];
 137                 if (w->out.len) {
 138                         const char *p = w->out.buf;
 139                         size_t len = w->out.len;
 140
 141                         /* Skip the leading hunk mark of the first file. */
 142                         if (skip_first_line) {
 143                                 while (len) {
 144                                         len--;
 145                                         if (*p++ == '\n')
 146                                                 break;
 147                                 }
 148                                 skip_first_line = 0;
 149                         }
 150
 151                         write_or_die(1, p, len);
 152                 }
 153                 grep_source_clear(&w->source);
 154         }
 155
 156         if (old_done != todo_done)
 157                 pthread_cond_signal(&cond_write);
 158
 159         if (all_work_added && todo_done == todo_end)
 160                 pthread_cond_signal(&cond_result);
 161
 162         grep_unlock();
 163 }
 164
 165 static void *run(void *arg)
 166 {
 167         int hit = 0;
 168         struct grep_opt *opt = arg;
 169
 170         while (1) {
 171                 struct work_item *w = get_work();
 172                 if (!w)
 173                         break;
 174
 175                 opt->output_priv = w;
 176                 hit |= grep_source(opt, &w->source);
 177                 grep_source_clear_data(&w->source);
 178                 work_done(w);
 179         }
 180         free_grep_patterns(arg);
 181         free(arg);
 182
 183         return (void*) (intptr_t) hit;
 184 }
 185
 186 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
 187 {
 188         struct work_item *w = opt->output_priv;
 189         strbuf_add(&w->out, buf, size);
 190 }
 191
 192 static void start_threads(struct grep_opt *opt)
 193 {
 194         int i;
 195
 196         pthread_mutex_init(&grep_mutex, NULL);
 197         pthread_mutex_init(&grep_read_mutex, NULL);
 198         pthread_mutex_init(&grep_attr_mutex, NULL);
 199         pthread_cond_init(&cond_add, NULL);
 200         pthread_cond_init(&cond_write, NULL);
 201         pthread_cond_init(&cond_result, NULL);
 202         grep_use_locks = 1;
 203
 204         for (i = 0; i < ARRAY_SIZE(todo); i++) {
 205                 strbuf_init(&todo[i].out, 0);
 206         }
 207
 208         for (i = 0; i < ARRAY_SIZE(threads); i++) {
 209                 int err;
 210                 struct grep_opt *o = grep_opt_dup(opt);
 211                 o->output = strbuf_out;
 212                 o->debug = 0;
 213                 compile_grep_patterns(o);
 214                 err = pthread_create(&threads[i], NULL, run, o);
 215
 216                 if (err)
 217                         die(_("grep: failed to create thread: %s"),
 218                             strerror(err));
 219         }
 220 }
 221
 222 static int wait_all(void)
 223 {
 224         int hit = 0;
 225         int i;
 226
 227         grep_lock();
 228         all_work_added = 1;
 229
 230         /* Wait until all work is done. */
 231         while (todo_done != todo_end)
 232                 pthread_cond_wait(&cond_result, &grep_mutex);
 233
 234         /* Wake up all the consumer threads so they can see that there
 235          * is no more work to do.
 236          */
 237         pthread_cond_broadcast(&cond_add);
 238         grep_unlock();
 239
 240         for (i = 0; i < ARRAY_SIZE(threads); i++) {
 241                 void *h;
 242                 pthread_join(threads[i], &h);
 243                 hit |= (int) (intptr_t) h;
 244         }
 245
 246         pthread_mutex_destroy(&grep_mutex);
 247         pthread_mutex_destroy(&grep_read_mutex);
 248         pthread_mutex_destroy(&grep_attr_mutex);
 249         pthread_cond_destroy(&cond_add);
 250         pthread_cond_destroy(&cond_write);
 251         pthread_cond_destroy(&cond_result);
 252         grep_use_locks = 0;
 253
 254         return hit;
 255 }
 256 #else /* !NO_PTHREADS */
 257
 258 static int wait_all(void)
 259 {
 260         return 0;
 261 }
 262 #endif
 263
 264 static int parse_pattern_type_arg(const char *opt, const char *arg)
 265 {
 266         if (!strcmp(arg, "default"))
 267                 return GREP_PATTERN_TYPE_UNSPECIFIED;
 268         else if (!strcmp(arg, "basic"))
 269                 return GREP_PATTERN_TYPE_BRE;
 270         else if (!strcmp(arg, "extended"))
 271                 return GREP_PATTERN_TYPE_ERE;
 272         else if (!strcmp(arg, "fixed"))
 273                 return GREP_PATTERN_TYPE_FIXED;
 274         else if (!strcmp(arg, "perl"))
 275                 return GREP_PATTERN_TYPE_PCRE;
 276         die("bad %s argument: %s", opt, arg);
 277 }
 278
 279 static void grep_pattern_type_options(const int pattern_type, struct grep_opt *opt)
 280 {
 281         switch (pattern_type) {
 282         case GREP_PATTERN_TYPE_UNSPECIFIED:
 283                 /* fall through */
 284
 285         case GREP_PATTERN_TYPE_BRE:
 286                 opt->fixed = 0;
 287                 opt->pcre = 0;
 288                 opt->regflags &= ~REG_EXTENDED;
 289                 break;
 290
 291         case GREP_PATTERN_TYPE_ERE:
 292                 opt->fixed = 0;
 293                 opt->pcre = 0;
 294                 opt->regflags |= REG_EXTENDED;
 295                 break;
 296
 297         case GREP_PATTERN_TYPE_FIXED:
 298                 opt->fixed = 1;
 299                 opt->pcre = 0;
 300                 opt->regflags &= ~REG_EXTENDED;
 301                 break;
 302
 303         case GREP_PATTERN_TYPE_PCRE:
 304                 opt->fixed = 0;
 305                 opt->pcre = 1;
 306                 opt->regflags &= ~REG_EXTENDED;
 307                 break;
 308         }
 309 }
 310
 311 static int grep_config(const char *var, const char *value, void *cb)
 312 {
 313         struct grep_opt *opt = cb;
 314         char *color = NULL;
 315
 316         if (userdiff_config(var, value) < 0)
 317                 return -1;
 318
 319         if (!strcmp(var, "grep.extendedregexp")) {
 320                 if (git_config_bool(var, value))
 321                         opt->extended_regexp_option = 1;
 322                 else
 323                         opt->extended_regexp_option = 0;
 324                 return 0;
 325         }
 326
 327         if (!strcmp(var, "grep.patterntype")) {
 328                 opt->pattern_type_option = parse_pattern_type_arg(var, value);
 329                 return 0;
 330   }
 331
 332         if (!strcmp(var, "grep.linenumber")) {
 333                 opt->linenum = git_config_bool(var, value);
 334                 return 0;
 335         }
 336
 337         if (!strcmp(var, "color.grep"))
 338                 opt->color = git_config_colorbool(var, value);
 339         else if (!strcmp(var, "color.grep.context"))
 340                 color = opt->color_context;
 341         else if (!strcmp(var, "color.grep.filename"))
 342                 color = opt->color_filename;
 343         else if (!strcmp(var, "color.grep.function"))
 344                 color = opt->color_function;
 345         else if (!strcmp(var, "color.grep.linenumber"))
 346                 color = opt->color_lineno;
 347         else if (!strcmp(var, "color.grep.match"))
 348                 color = opt->color_match;
 349         else if (!strcmp(var, "color.grep.selected"))
 350                 color = opt->color_selected;
 351         else if (!strcmp(var, "color.grep.separator"))
 352                 color = opt->color_sep;
 353         else
 354                 return git_color_default_config(var, value, cb);
 355         if (color) {
 356                 if (!value)
 357                         return config_error_nonbool(var);
 358                 color_parse(value, var, color);
 359         }
 360         return 0;
 361 }
 362
 363 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 364 {
 365         void *data;
 366
 367         grep_read_lock();
 368         data = read_sha1_file(sha1, type, size);
 369         grep_read_unlock();
 370         return data;
 371 }
 372
 373 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
 374                      const char *filename, int tree_name_len)
 375 {
 376         struct strbuf pathbuf = STRBUF_INIT;
 377
 378         if (opt->relative && opt->prefix_length) {
 379                 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
 380                                     opt->prefix);
 381                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
 382         } else {
 383                 strbuf_addstr(&pathbuf, filename);
 384         }
 385
 386 #ifndef NO_PTHREADS
 387         if (use_threads) {
 388                 add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, sha1);
 389                 strbuf_release(&pathbuf);
 390                 return 0;
 391         } else
 392 #endif
 393         {
 394                 struct grep_source gs;
 395                 int hit;
 396
 397                 grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, sha1);
 398                 strbuf_release(&pathbuf);
 399                 hit = grep_source(opt, &gs);
 400
 401                 grep_source_clear(&gs);
 402                 return hit;
 403         }
 404 }
 405
 406 static int grep_file(struct grep_opt *opt, const char *filename)
 407 {
 408         struct strbuf buf = STRBUF_INIT;
 409
 410         if (opt->relative && opt->prefix_length)
 411                 quote_path_relative(filename, -1, &buf, opt->prefix);
 412         else
 413                 strbuf_addstr(&buf, filename);
 414
 415 #ifndef NO_PTHREADS
 416         if (use_threads) {
 417                 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename);
 418                 strbuf_release(&buf);
 419                 return 0;
 420         } else
 421 #endif
 422         {
 423                 struct grep_source gs;
 424                 int hit;
 425
 426                 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename);
 427                 strbuf_release(&buf);
 428                 hit = grep_source(opt, &gs);
 429
 430                 grep_source_clear(&gs);
 431                 return hit;
 432         }
 433 }
 434
 435 static void append_path(struct grep_opt *opt, const void *data, size_t len)
 436 {
 437         struct string_list *path_list = opt->output_priv;
 438
 439         if (len == 1 && *(const char *)data == '\0')
 440                 return;
 441         string_list_append(path_list, xstrndup(data, len));
 442 }
 443
 444 static void run_pager(struct grep_opt *opt, const char *prefix)
 445 {
 446         struct string_list *path_list = opt->output_priv;
 447         const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
 448         int i, status;
 449
 450         for (i = 0; i < path_list->nr; i++)
 451                 argv[i] = path_list->items[i].string;
 452         argv[path_list->nr] = NULL;
 453
 454         if (prefix && chdir(prefix))
 455                 die(_("Failed to chdir: %s"), prefix);
 456         status = run_command_v_opt(argv, RUN_USING_SHELL);
 457         if (status)
 458                 exit(status);
 459         free(argv);
 460 }
 461
 462 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
 463 {
 464         int hit = 0;
 465         int nr;
 466         read_cache();
 467
 468         for (nr = 0; nr < active_nr; nr++) {
 469                 struct cache_entry *ce = active_cache[nr];
 470                 if (!S_ISREG(ce->ce_mode))
 471                         continue;
 472                 if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
 473                         continue;
 474                 /*
 475                  * If CE_VALID is on, we assume worktree file and its cache entry
 476                  * are identical, even if worktree file has been modified, so use
 477                  * cache version instead
 478                  */
 479                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
 480                         if (ce_stage(ce))
 481                                 continue;
 482                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
 483                 }
 484                 else
 485                         hit |= grep_file(opt, ce->name);
 486                 if (ce_stage(ce)) {
 487                         do {
 488                                 nr++;
 489                         } while (nr < active_nr &&
 490                                  !strcmp(ce->name, active_cache[nr]->name));
 491                         nr--; /* compensate for loop control */
 492                 }
 493                 if (hit && opt->status_only)
 494                         break;
 495         }
 496         return hit;
 497 }
 498
 499 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 500                      struct tree_desc *tree, struct strbuf *base, int tn_len)
 501 {
 502         int hit = 0;
 503         enum interesting match = entry_not_interesting;
 504         struct name_entry entry;
 505         int old_baselen = base->len;
 506
 507         while (tree_entry(tree, &entry)) {
 508                 int te_len = tree_entry_len(&entry);
 509
 510                 if (match != all_entries_interesting) {
 511                         match = tree_entry_interesting(&entry, base, tn_len, pathspec);
 512                         if (match == all_entries_not_interesting)
 513                                 break;
 514                         if (match == entry_not_interesting)
 515                                 continue;
 516                 }
 517
 518                 strbuf_add(base, entry.path, te_len);
 519
 520                 if (S_ISREG(entry.mode)) {
 521                         hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
 522                 }
 523                 else if (S_ISDIR(entry.mode)) {
 524                         enum object_type type;
 525                         struct tree_desc sub;
 526                         void *data;
 527                         unsigned long size;
 528
 529                         data = lock_and_read_sha1_file(entry.sha1, &type, &size);
 530                         if (!data)
 531                                 die(_("unable to read tree (%s)"),
 532                                     sha1_to_hex(entry.sha1));
 533
 534                         strbuf_addch(base, '/');
 535                         init_tree_desc(&sub, data, size);
 536                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
 537                         free(data);
 538                 }
 539                 strbuf_setlen(base, old_baselen);
 540
 541                 if (hit && opt->status_only)
 542                         break;
 543         }
 544         return hit;
 545 }
 546
 547 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 548                        struct object *obj, const char *name)
 549 {
 550         if (obj->type == OBJ_BLOB)
 551                 return grep_sha1(opt, obj->sha1, name, 0);
 552         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 553                 struct tree_desc tree;
 554                 void *data;
 555                 unsigned long size;
 556                 struct strbuf base;
 557                 int hit, len;
 558
 559                 grep_read_lock();
 560                 data = read_object_with_reference(obj->sha1, tree_type,
 561                                                   &size, NULL);
 562                 grep_read_unlock();
 563
 564                 if (!data)
 565                         die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
 566
 567                 len = name ? strlen(name) : 0;
 568                 strbuf_init(&base, PATH_MAX + len + 1);
 569                 if (len) {
 570                         strbuf_add(&base, name, len);
 571                         strbuf_addch(&base, ':');
 572                 }
 573                 init_tree_desc(&tree, data, size);
 574                 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
 575                 strbuf_release(&base);
 576                 free(data);
 577                 return hit;
 578         }
 579         die(_("unable to grep from object of type %s"), typename(obj->type));
 580 }
 581
 582 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 583                         const struct object_array *list)
 584 {
 585         unsigned int i;
 586         int hit = 0;
 587         const unsigned int nr = list->nr;
 588
 589         for (i = 0; i < nr; i++) {
 590                 struct object *real_obj;
 591                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
 592                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
 593                         hit = 1;
 594                         if (opt->status_only)
 595                                 break;
 596                 }
 597         }
 598         return hit;
 599 }
 600
 601 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 602                           int exc_std)
 603 {
 604         struct dir_struct dir;
 605         int i, hit = 0;
 606
 607         memset(&dir, 0, sizeof(dir));
 608         if (exc_std)
 609                 setup_standard_excludes(&dir);
 610
 611         fill_directory(&dir, pathspec->raw);
 612         for (i = 0; i < dir.nr; i++) {
 613                 const char *name = dir.entries[i]->name;
 614                 int namelen = strlen(name);
 615                 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
 616                         continue;
 617                 hit |= grep_file(opt, dir.entries[i]->name);
 618                 if (hit && opt->status_only)
 619                         break;
 620         }
 621         return hit;
 622 }
 623
 624 static int context_callback(const struct option *opt, const char *arg,
 625                             int unset)
 626 {
 627         struct grep_opt *grep_opt = opt->value;
 628         int value;
 629         const char *endp;
 630
 631         if (unset) {
 632                 grep_opt->pre_context = grep_opt->post_context = 0;
 633                 return 0;
 634         }
 635         value = strtol(arg, (char **)&endp, 10);
 636         if (*endp) {
 637                 return error(_("switch `%c' expects a numerical value"),
 638                              opt->short_name);
 639         }
 640         grep_opt->pre_context = grep_opt->post_context = value;
 641         return 0;
 642 }
 643
 644 static int file_callback(const struct option *opt, const char *arg, int unset)
 645 {
 646         struct grep_opt *grep_opt = opt->value;
 647         int from_stdin = !strcmp(arg, "-");
 648         FILE *patterns;
 649         int lno = 0;
 650         struct strbuf sb = STRBUF_INIT;
 651
 652         patterns = from_stdin ? stdin : fopen(arg, "r");
 653         if (!patterns)
 654                 die_errno(_("cannot open '%s'"), arg);
 655         while (strbuf_getline(&sb, patterns, '\n') == 0) {
 656                 /* ignore empty line like grep does */
 657                 if (sb.len == 0)
 658                         continue;
 659
 660                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 661                                 GREP_PATTERN);
 662         }
 663         if (!from_stdin)
 664                 fclose(patterns);
 665         strbuf_release(&sb);
 666         return 0;
 667 }
 668
 669 static int not_callback(const struct option *opt, const char *arg, int unset)
 670 {
 671         struct grep_opt *grep_opt = opt->value;
 672         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 673         return 0;
 674 }
 675
 676 static int and_callback(const struct option *opt, const char *arg, int unset)
 677 {
 678         struct grep_opt *grep_opt = opt->value;
 679         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 680         return 0;
 681 }
 682
 683 static int open_callback(const struct option *opt, const char *arg, int unset)
 684 {
 685         struct grep_opt *grep_opt = opt->value;
 686         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 687         return 0;
 688 }
 689
 690 static int close_callback(const struct option *opt, const char *arg, int unset)
 691 {
 692         struct grep_opt *grep_opt = opt->value;
 693         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 694         return 0;
 695 }
 696
 697 static int pattern_callback(const struct option *opt, const char *arg,
 698                             int unset)
 699 {
 700         struct grep_opt *grep_opt = opt->value;
 701         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 702         return 0;
 703 }
 704
 705 static int help_callback(const struct option *opt, const char *arg, int unset)
 706 {
 707         return -1;
 708 }
 709
 710 int cmd_grep(int argc, const char **argv, const char *prefix)
 711 {
 712         int hit = 0;
 713         int cached = 0, untracked = 0, opt_exclude = -1;
 714         int seen_dashdash = 0;
 715         int external_grep_allowed__ignored;
 716         const char *show_in_pager = NULL, *default_pager = "dummy";
 717         struct grep_opt opt;
 718         struct object_array list = OBJECT_ARRAY_INIT;
 719         const char **paths = NULL;
 720         struct pathspec pathspec;
 721         struct string_list path_list = STRING_LIST_INIT_NODUP;
 722         int i;
 723         int dummy;
 724         int use_index = 1;
 725         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 726
 727         struct option options[] = {
 728                 OPT_BOOLEAN(0, "cached", &cached,
 729                         N_("search in index instead of in the work tree")),
 730                 OPT_NEGBIT(0, "no-index", &use_index,
 731                          N_("find in contents not managed by git"), 1),
 732                 OPT_BOOLEAN(0, "untracked", &untracked,
 733                         N_("search in both tracked and untracked files")),
 734                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
 735                             N_("search also in ignored files"), 1),
 736                 OPT_GROUP(""),
 737                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
 738                         N_("show non-matching lines")),
 739                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
 740                         N_("case insensitive matching")),
 741                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
 742                         N_("match patterns only at word boundaries")),
 743                 OPT_SET_INT('a', "text", &opt.binary,
 744                         N_("process binary files as text"), GREP_BINARY_TEXT),
 745                 OPT_SET_INT('I', NULL, &opt.binary,
 746                         N_("don't match patterns in binary files"),
 747                         GREP_BINARY_NOMATCH),
 748                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
 749                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
 750                         NULL, 1 },
 751                 OPT_GROUP(""),
 752                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
 753                             N_("use extended POSIX regular expressions"),
 754                             GREP_PATTERN_TYPE_ERE),
 755                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
 756                             N_("use basic POSIX regular expressions (default)"),
 757                             GREP_PATTERN_TYPE_BRE),
 758                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
 759                             N_("interpret patterns as fixed strings"),
 760                             GREP_PATTERN_TYPE_FIXED),
 761                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
 762                             N_("use Perl-compatible regular expressions"),
 763                             GREP_PATTERN_TYPE_PCRE),
 764                 OPT_GROUP(""),
 765                 OPT_BOOLEAN('n', "line-number", &opt.linenum, N_("show line numbers")),
 766                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
 767                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
 768                 OPT_NEGBIT(0, "full-name", &opt.relative,
 769                         N_("show filenames relative to top directory"), 1),
 770                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
 771                         N_("show only filenames instead of matching lines")),
 772                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
 773                         N_("synonym for --files-with-matches")),
 774                 OPT_BOOLEAN('L', "files-without-match",
 775                         &opt.unmatch_name_only,
 776                         N_("show only the names of files without match")),
 777                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
 778                         N_("print NUL after filenames")),
 779                 OPT_BOOLEAN('c', "count", &opt.count,
 780                         N_("show the number of matches instead of matching lines")),
 781                 OPT__COLOR(&opt.color, N_("highlight matches")),
 782                 OPT_BOOLEAN(0, "break", &opt.file_break,
 783                         N_("print empty line between matches from different files")),
 784                 OPT_BOOLEAN(0, "heading", &opt.heading,
 785                         N_("show filename only once above matches from same file")),
 786                 OPT_GROUP(""),
 787                 OPT_CALLBACK('C', "context", &opt, N_("n"),
 788                         N_("show <n> context lines before and after matches"),
 789                         context_callback),
 790                 OPT_INTEGER('B', "before-context", &opt.pre_context,
 791                         N_("show <n> context lines before matches")),
 792                 OPT_INTEGER('A', "after-context", &opt.post_context,
 793                         N_("show <n> context lines after matches")),
 794                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
 795                         context_callback),
 796                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
 797                         N_("show a line with the function name before matches")),
 798                 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
 799                         N_("show the surrounding function")),
 800                 OPT_GROUP(""),
 801                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
 802                         N_("read patterns from file"), file_callback),
 803                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
 804                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
 805                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
 806                   N_("combine patterns specified with -e"),
 807                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
 808                 OPT_BOOLEAN(0, "or", &dummy, ""),
 809                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
 810                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
 811                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
 812                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 813                   open_callback },
 814                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
 815                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 816                   close_callback },
 817                 OPT__QUIET(&opt.status_only,
 818                            N_("indicate hit with exit status without output")),
 819                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
 820                         N_("show only matches from files that match all patterns")),
 821                 { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
 822                   N_("show parse tree for grep expression"),
 823                   PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
 824                 OPT_GROUP(""),
 825                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
 826                         N_("pager"), N_("show matching files in the pager"),
 827                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
 828                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
 829                             N_("allow calling of grep(1) (ignored by this build)")),
 830                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, N_("show usage"),
 831                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 832                 OPT_END()
 833         };
 834
 835         /*
 836          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
 837          * to show usage information and exit.
 838          */
 839         if (argc == 2 && !strcmp(argv[1], "-h"))
 840                 usage_with_options(grep_usage, options);
 841
 842         memset(&opt, 0, sizeof(opt));
 843         opt.prefix = prefix;
 844         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 845         opt.relative = 1;
 846         opt.pathname = 1;
 847         opt.pattern_tail = &opt.pattern_list;
 848         opt.header_tail = &opt.header_list;
 849         opt.regflags = REG_NEWLINE;
 850         opt.max_depth = -1;
 851         opt.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
 852         opt.extended_regexp_option = 0;
 853
 854         strcpy(opt.color_context, "");
 855         strcpy(opt.color_filename, "");
 856         strcpy(opt.color_function, "");
 857         strcpy(opt.color_lineno, "");
 858         strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
 859         strcpy(opt.color_selected, "");
 860         strcpy(opt.color_sep, GIT_COLOR_CYAN);
 861         opt.color = -1;
 862         git_config(grep_config, &opt);
 863
 864         /*
 865          * If there is no -- then the paths must exist in the working
 866          * tree.  If there is no explicit pattern specified with -e or
 867          * -f, we take the first unrecognized non option to be the
 868          * pattern, but then what follows it must be zero or more
 869          * valid refs up to the -- (if exists), and then existing
 870          * paths.  If there is an explicit pattern, then the first
 871          * unrecognized non option is the beginning of the refs list
 872          * that continues up to the -- (if exists), and then paths.
 873          */
 874         argc = parse_options(argc, argv, prefix, options, grep_usage,
 875                              PARSE_OPT_KEEP_DASHDASH |
 876                              PARSE_OPT_STOP_AT_NON_OPTION |
 877                              PARSE_OPT_NO_INTERNAL_HELP);
 878
 879         if (pattern_type_arg != GREP_PATTERN_TYPE_UNSPECIFIED)
 880                 grep_pattern_type_options(pattern_type_arg, &opt);
 881         else if (opt.pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
 882                 grep_pattern_type_options(opt.pattern_type_option, &opt);
 883         else if (opt.extended_regexp_option)
 884                 grep_pattern_type_options(GREP_PATTERN_TYPE_ERE, &opt);
 885
 886         if (use_index && !startup_info->have_repository)
 887                 /* die the same way as if we did it at the beginning */
 888                 setup_git_directory();
 889
 890         /*
 891          * skip a -- separator; we know it cannot be
 892          * separating revisions from pathnames if
 893          * we haven't even had any patterns yet
 894          */
 895         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
 896                 argv++;
 897                 argc--;
 898         }
 899
 900         /* First unrecognized non-option token */
 901         if (argc > 0 && !opt.pattern_list) {
 902                 append_grep_pattern(&opt, argv[0], "command line", 0,
 903                                     GREP_PATTERN);
 904                 argv++;
 905                 argc--;
 906         }
 907
 908         if (show_in_pager == default_pager)
 909                 show_in_pager = git_pager(1);
 910         if (show_in_pager) {
 911                 opt.color = 0;
 912                 opt.name_only = 1;
 913                 opt.null_following_name = 1;
 914                 opt.output_priv = &path_list;
 915                 opt.output = append_path;
 916                 string_list_append(&path_list, show_in_pager);
 917                 use_threads = 0;
 918         }
 919
 920         if (!opt.pattern_list)
 921                 die(_("no pattern given."));
 922         if (!opt.fixed && opt.ignore_case)
 923                 opt.regflags |= REG_ICASE;
 924
 925         compile_grep_patterns(&opt);
 926
 927         /* Check revs and then paths */
 928         for (i = 0; i < argc; i++) {
 929                 const char *arg = argv[i];
 930                 unsigned char sha1[20];
 931                 /* Is it a rev? */
 932                 if (!get_sha1(arg, sha1)) {
 933                         struct object *object = parse_object(sha1);
 934                         if (!object)
 935                                 die(_("bad object %s"), arg);
 936                         add_object_array(object, arg, &list);
 937                         continue;
 938                 }
 939                 if (!strcmp(arg, "--")) {
 940                         i++;
 941                         seen_dashdash = 1;
 942                 }
 943                 break;
 944         }
 945
 946 #ifndef NO_PTHREADS
 947         if (list.nr || cached || online_cpus() == 1)
 948                 use_threads = 0;
 949 #else
 950         use_threads = 0;
 951 #endif
 952
 953 #ifndef NO_PTHREADS
 954         if (use_threads) {
 955                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
 956                     && (opt.pre_context || opt.post_context ||
 957                         opt.file_break || opt.funcbody))
 958                         skip_first_line = 1;
 959                 start_threads(&opt);
 960         }
 961 #endif
 962
 963         /* The rest are paths */
 964         if (!seen_dashdash) {
 965                 int j;
 966                 for (j = i; j < argc; j++)
 967                         verify_filename(prefix, argv[j], j == i);
 968         }
 969
 970         paths = get_pathspec(prefix, argv + i);
 971         init_pathspec(&pathspec, paths);
 972         pathspec.max_depth = opt.max_depth;
 973         pathspec.recursive = 1;
 974
 975         if (show_in_pager && (cached || list.nr))
 976                 die(_("--open-files-in-pager only works on the worktree"));
 977
 978         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
 979                 const char *pager = path_list.items[0].string;
 980                 int len = strlen(pager);
 981
 982                 if (len > 4 && is_dir_sep(pager[len - 5]))
 983                         pager += len - 4;
 984
 985                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
 986                         struct strbuf buf = STRBUF_INIT;
 987                         strbuf_addf(&buf, "+/%s%s",
 988                                         strcmp("less", pager) ? "" : "*",
 989                                         opt.pattern_list->pattern);
 990                         string_list_append(&path_list, buf.buf);
 991                         strbuf_detach(&buf, NULL);
 992                 }
 993         }
 994
 995         if (!show_in_pager)
 996                 setup_pager();
 997
 998         if (!use_index && (untracked || cached))
 999                 die(_("--cached or --untracked cannot be used with --no-index."));
1000
1001         if (!use_index || untracked) {
1002                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1003                 if (list.nr)
1004                         die(_("--no-index or --untracked cannot be used with revs."));
1005                 hit = grep_directory(&opt, &pathspec, use_exclude);
1006         } else if (0 <= opt_exclude) {
1007                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1008         } else if (!list.nr) {
1009                 if (!cached)
1010                         setup_work_tree();
1011
1012                 hit = grep_cache(&opt, &pathspec, cached);
1013         } else {
1014                 if (cached)
1015                         die(_("both --cached and trees are given."));
1016                 hit = grep_objects(&opt, &pathspec, &list);
1017         }
1018
1019         if (use_threads)
1020                 hit |= wait_all();
1021         if (hit && show_in_pager)
1022                 run_pager(&opt, prefix);
1023         free_grep_patterns(&opt);
1024         return !hit;
1025 }