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   1 /*
   2  * Builtin "git grep"
   3  *
   4  * Copyright (c) 2006 Junio C Hamano
   5  */
   6 #define USE_THE_INDEX_COMPATIBILITY_MACROS
   7 #include "cache.h"
   8 #include "repository.h"
   9 #include "config.h"
  10 #include "blob.h"
  11 #include "tree.h"
  12 #include "commit.h"
  13 #include "tag.h"
  14 #include "tree-walk.h"
  15 #include "builtin.h"
  16 #include "parse-options.h"
  17 #include "string-list.h"
  18 #include "run-command.h"
  19 #include "userdiff.h"
  20 #include "grep.h"
  21 #include "quote.h"
  22 #include "dir.h"
  23 #include "pathspec.h"
  24 #include "submodule.h"
  25 #include "submodule-config.h"
  26 #include "object-store.h"
  27
  28 static char const * const grep_usage[] = {
  29         N_("git grep [<options>] [-e] <pattern> [<rev>...] [[--] <path>...]"),
  30         NULL
  31 };
  32
  33 static int recurse_submodules;
  34
  35 #define GREP_NUM_THREADS_DEFAULT 8
  36 static int num_threads;
  37
  38 static pthread_t *threads;
  39
  40 /* We use one producer thread and THREADS consumer
  41  * threads. The producer adds struct work_items to 'todo' and the
  42  * consumers pick work items from the same array.
  43  */
  44 struct work_item {
  45         struct grep_source source;
  46         char done;
  47         struct strbuf out;
  48 };
  49
  50 /* In the range [todo_done, todo_start) in 'todo' we have work_items
  51  * that have been or are processed by a consumer thread. We haven't
  52  * written the result for these to stdout yet.
  53  *
  54  * The work_items in [todo_start, todo_end) are waiting to be picked
  55  * up by a consumer thread.
  56  *
  57  * The ranges are modulo TODO_SIZE.
  58  */
  59 #define TODO_SIZE 128
  60 static struct work_item todo[TODO_SIZE];
  61 static int todo_start;
  62 static int todo_end;
  63 static int todo_done;
  64
  65 /* Has all work items been added? */
  66 static int all_work_added;
  67
  68 /* This lock protects all the variables above. */
  69 static pthread_mutex_t grep_mutex;
  70
  71 static inline void grep_lock(void)
  72 {
  73         pthread_mutex_lock(&grep_mutex);
  74 }
  75
  76 static inline void grep_unlock(void)
  77 {
  78         pthread_mutex_unlock(&grep_mutex);
  79 }
  80
  81 /* Signalled when a new work_item is added to todo. */
  82 static pthread_cond_t cond_add;
  83
  84 /* Signalled when the result from one work_item is written to
  85  * stdout.
  86  */
  87 static pthread_cond_t cond_write;
  88
  89 /* Signalled when we are finished with everything. */
  90 static pthread_cond_t cond_result;
  91
  92 static int skip_first_line;
  93
  94 static void add_work(struct grep_opt *opt, const struct grep_source *gs)
  95 {
  96         grep_lock();
  97
  98         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
  99                 pthread_cond_wait(&cond_write, &grep_mutex);
 100         }
 101
 102         todo[todo_end].source = *gs;
 103         if (opt->binary != GREP_BINARY_TEXT)
 104                 grep_source_load_driver(&todo[todo_end].source,
 105                                         opt->repo->index);
 106         todo[todo_end].done = 0;
 107         strbuf_reset(&todo[todo_end].out);
 108         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
 109
 110         pthread_cond_signal(&cond_add);
 111         grep_unlock();
 112 }
 113
 114 static struct work_item *get_work(void)
 115 {
 116         struct work_item *ret;
 117
 118         grep_lock();
 119         while (todo_start == todo_end && !all_work_added) {
 120                 pthread_cond_wait(&cond_add, &grep_mutex);
 121         }
 122
 123         if (todo_start == todo_end && all_work_added) {
 124                 ret = NULL;
 125         } else {
 126                 ret = &todo[todo_start];
 127                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
 128         }
 129         grep_unlock();
 130         return ret;
 131 }
 132
 133 static void work_done(struct work_item *w)
 134 {
 135         int old_done;
 136
 137         grep_lock();
 138         w->done = 1;
 139         old_done = todo_done;
 140         for(; todo[todo_done].done && todo_done != todo_start;
 141             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
 142                 w = &todo[todo_done];
 143                 if (w->out.len) {
 144                         const char *p = w->out.buf;
 145                         size_t len = w->out.len;
 146
 147                         /* Skip the leading hunk mark of the first file. */
 148                         if (skip_first_line) {
 149                                 while (len) {
 150                                         len--;
 151                                         if (*p++ == '\n')
 152                                                 break;
 153                                 }
 154                                 skip_first_line = 0;
 155                         }
 156
 157                         write_or_die(1, p, len);
 158                 }
 159                 grep_source_clear(&w->source);
 160         }
 161
 162         if (old_done != todo_done)
 163                 pthread_cond_signal(&cond_write);
 164
 165         if (all_work_added && todo_done == todo_end)
 166                 pthread_cond_signal(&cond_result);
 167
 168         grep_unlock();
 169 }
 170
 171 static void *run(void *arg)
 172 {
 173         int hit = 0;
 174         struct grep_opt *opt = arg;
 175
 176         while (1) {
 177                 struct work_item *w = get_work();
 178                 if (!w)
 179                         break;
 180
 181                 opt->output_priv = w;
 182                 hit |= grep_source(opt, &w->source);
 183                 grep_source_clear_data(&w->source);
 184                 work_done(w);
 185         }
 186         free_grep_patterns(arg);
 187         free(arg);
 188
 189         return (void*) (intptr_t) hit;
 190 }
 191
 192 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
 193 {
 194         struct work_item *w = opt->output_priv;
 195         strbuf_add(&w->out, buf, size);
 196 }
 197
 198 static void start_threads(struct grep_opt *opt)
 199 {
 200         int i;
 201
 202         pthread_mutex_init(&grep_mutex, NULL);
 203         pthread_mutex_init(&grep_read_mutex, NULL);
 204         pthread_mutex_init(&grep_attr_mutex, NULL);
 205         pthread_cond_init(&cond_add, NULL);
 206         pthread_cond_init(&cond_write, NULL);
 207         pthread_cond_init(&cond_result, NULL);
 208         grep_use_locks = 1;
 209
 210         for (i = 0; i < ARRAY_SIZE(todo); i++) {
 211                 strbuf_init(&todo[i].out, 0);
 212         }
 213
 214         threads = xcalloc(num_threads, sizeof(*threads));
 215         for (i = 0; i < num_threads; i++) {
 216                 int err;
 217                 struct grep_opt *o = grep_opt_dup(opt);
 218                 o->output = strbuf_out;
 219                 if (i)
 220                         o->debug = 0;
 221                 compile_grep_patterns(o);
 222                 err = pthread_create(&threads[i], NULL, run, o);
 223
 224                 if (err)
 225                         die(_("grep: failed to create thread: %s"),
 226                             strerror(err));
 227         }
 228 }
 229
 230 static int wait_all(void)
 231 {
 232         int hit = 0;
 233         int i;
 234
 235         if (!HAVE_THREADS)
 236                 BUG("Never call this function unless you have started threads");
 237
 238         grep_lock();
 239         all_work_added = 1;
 240
 241         /* Wait until all work is done. */
 242         while (todo_done != todo_end)
 243                 pthread_cond_wait(&cond_result, &grep_mutex);
 244
 245         /* Wake up all the consumer threads so they can see that there
 246          * is no more work to do.
 247          */
 248         pthread_cond_broadcast(&cond_add);
 249         grep_unlock();
 250
 251         for (i = 0; i < num_threads; i++) {
 252                 void *h;
 253                 pthread_join(threads[i], &h);
 254                 hit |= (int) (intptr_t) h;
 255         }
 256
 257         free(threads);
 258
 259         pthread_mutex_destroy(&grep_mutex);
 260         pthread_mutex_destroy(&grep_read_mutex);
 261         pthread_mutex_destroy(&grep_attr_mutex);
 262         pthread_cond_destroy(&cond_add);
 263         pthread_cond_destroy(&cond_write);
 264         pthread_cond_destroy(&cond_result);
 265         grep_use_locks = 0;
 266
 267         return hit;
 268 }
 269
 270 static int grep_cmd_config(const char *var, const char *value, void *cb)
 271 {
 272         int st = grep_config(var, value, cb);
 273         if (git_color_default_config(var, value, cb) < 0)
 274                 st = -1;
 275
 276         if (!strcmp(var, "grep.threads")) {
 277                 num_threads = git_config_int(var, value);
 278                 if (num_threads < 0)
 279                         die(_("invalid number of threads specified (%d) for %s"),
 280                             num_threads, var);
 281                 else if (!HAVE_THREADS && num_threads > 1) {
 282                         /*
 283                          * TRANSLATORS: %s is the configuration
 284                          * variable for tweaking threads, currently
 285                          * grep.threads
 286                          */
 287                         warning(_("no threads support, ignoring %s"), var);
 288                         num_threads = 1;
 289                 }
 290         }
 291
 292         if (!strcmp(var, "submodule.recurse"))
 293                 recurse_submodules = git_config_bool(var, value);
 294
 295         return st;
 296 }
 297
 298 static void *lock_and_read_oid_file(const struct object_id *oid, enum object_type *type, unsigned long *size)
 299 {
 300         void *data;
 301
 302         grep_read_lock();
 303         data = read_object_file(oid, type, size);
 304         grep_read_unlock();
 305         return data;
 306 }
 307
 308 static int grep_oid(struct grep_opt *opt, const struct object_id *oid,
 309                      const char *filename, int tree_name_len,
 310                      const char *path)
 311 {
 312         struct strbuf pathbuf = STRBUF_INIT;
 313         struct grep_source gs;
 314
 315         if (opt->relative && opt->prefix_length) {
 316                 quote_path_relative(filename + tree_name_len, opt->prefix, &pathbuf);
 317                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
 318         } else {
 319                 strbuf_addstr(&pathbuf, filename);
 320         }
 321
 322         grep_source_init(&gs, GREP_SOURCE_OID, pathbuf.buf, path, oid);
 323         strbuf_release(&pathbuf);
 324
 325         if (num_threads > 1) {
 326                 /*
 327                  * add_work() copies gs and thus assumes ownership of
 328                  * its fields, so do not call grep_source_clear()
 329                  */
 330                 add_work(opt, &gs);
 331                 return 0;
 332         } else {
 333                 int hit;
 334
 335                 hit = grep_source(opt, &gs);
 336
 337                 grep_source_clear(&gs);
 338                 return hit;
 339         }
 340 }
 341
 342 static int grep_file(struct grep_opt *opt, const char *filename)
 343 {
 344         struct strbuf buf = STRBUF_INIT;
 345         struct grep_source gs;
 346
 347         if (opt->relative && opt->prefix_length)
 348                 quote_path_relative(filename, opt->prefix, &buf);
 349         else
 350                 strbuf_addstr(&buf, filename);
 351
 352         grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
 353         strbuf_release(&buf);
 354
 355         if (num_threads > 1) {
 356                 /*
 357                  * add_work() copies gs and thus assumes ownership of
 358                  * its fields, so do not call grep_source_clear()
 359                  */
 360                 add_work(opt, &gs);
 361                 return 0;
 362         } else {
 363                 int hit;
 364
 365                 hit = grep_source(opt, &gs);
 366
 367                 grep_source_clear(&gs);
 368                 return hit;
 369         }
 370 }
 371
 372 static void append_path(struct grep_opt *opt, const void *data, size_t len)
 373 {
 374         struct string_list *path_list = opt->output_priv;
 375
 376         if (len == 1 && *(const char *)data == '\0')
 377                 return;
 378         string_list_append(path_list, xstrndup(data, len));
 379 }
 380
 381 static void run_pager(struct grep_opt *opt, const char *prefix)
 382 {
 383         struct string_list *path_list = opt->output_priv;
 384         struct child_process child = CHILD_PROCESS_INIT;
 385         int i, status;
 386
 387         for (i = 0; i < path_list->nr; i++)
 388                 argv_array_push(&child.args, path_list->items[i].string);
 389         child.dir = prefix;
 390         child.use_shell = 1;
 391
 392         status = run_command(&child);
 393         if (status)
 394                 exit(status);
 395 }
 396
 397 static int grep_cache(struct grep_opt *opt,
 398                       const struct pathspec *pathspec, int cached);
 399 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 400                      struct tree_desc *tree, struct strbuf *base, int tn_len,
 401                      int check_attr);
 402
 403 static int grep_submodule(struct grep_opt *opt,
 404                           const struct pathspec *pathspec,
 405                           const struct object_id *oid,
 406                           const char *filename, const char *path)
 407 {
 408         struct repository subrepo;
 409         struct repository *superproject = opt->repo;
 410         const struct submodule *sub = submodule_from_path(superproject,
 411                                                           &null_oid, path);
 412         struct grep_opt subopt;
 413         int hit;
 414
 415         /*
 416          * NEEDSWORK: submodules functions need to be protected because they
 417          * access the object store via config_from_gitmodules(): the latter
 418          * uses get_oid() which, for now, relies on the global the_repository
 419          * object.
 420          */
 421         grep_read_lock();
 422
 423         if (!is_submodule_active(superproject, path)) {
 424                 grep_read_unlock();
 425                 return 0;
 426         }
 427
 428         if (repo_submodule_init(&subrepo, superproject, sub)) {
 429                 grep_read_unlock();
 430                 return 0;
 431         }
 432
 433         repo_read_gitmodules(&subrepo);
 434
 435         /*
 436          * NEEDSWORK: This adds the submodule's object directory to the list of
 437          * alternates for the single in-memory object store.  This has some bad
 438          * consequences for memory (processed objects will never be freed) and
 439          * performance (this increases the number of pack files git has to pay
 440          * attention to, to the sum of the number of pack files in all the
 441          * repositories processed so far).  This can be removed once the object
 442          * store is no longer global and instead is a member of the repository
 443          * object.
 444          */
 445         add_to_alternates_memory(subrepo.objects->odb->path);
 446         grep_read_unlock();
 447
 448         memcpy(&subopt, opt, sizeof(subopt));
 449         subopt.repo = &subrepo;
 450
 451         if (oid) {
 452                 struct object *object;
 453                 struct tree_desc tree;
 454                 void *data;
 455                 unsigned long size;
 456                 struct strbuf base = STRBUF_INIT;
 457
 458                 object = parse_object_or_die(oid, oid_to_hex(oid));
 459
 460                 grep_read_lock();
 461                 data = read_object_with_reference(&object->oid, tree_type,
 462                                                   &size, NULL);
 463                 grep_read_unlock();
 464
 465                 if (!data)
 466                         die(_("unable to read tree (%s)"), oid_to_hex(&object->oid));
 467
 468                 strbuf_addstr(&base, filename);
 469                 strbuf_addch(&base, '/');
 470
 471                 init_tree_desc(&tree, data, size);
 472                 hit = grep_tree(&subopt, pathspec, &tree, &base, base.len,
 473                                 object->type == OBJ_COMMIT);
 474                 strbuf_release(&base);
 475                 free(data);
 476         } else {
 477                 hit = grep_cache(&subopt, pathspec, 1);
 478         }
 479
 480         repo_clear(&subrepo);
 481         return hit;
 482 }
 483
 484 static int grep_cache(struct grep_opt *opt,
 485                       const struct pathspec *pathspec, int cached)
 486 {
 487         struct repository *repo = opt->repo;
 488         int hit = 0;
 489         int nr;
 490         struct strbuf name = STRBUF_INIT;
 491         int name_base_len = 0;
 492         if (repo->submodule_prefix) {
 493                 name_base_len = strlen(repo->submodule_prefix);
 494                 strbuf_addstr(&name, repo->submodule_prefix);
 495         }
 496
 497         if (repo_read_index(repo) < 0)
 498                 die(_("index file corrupt"));
 499
 500         for (nr = 0; nr < repo->index->cache_nr; nr++) {
 501                 const struct cache_entry *ce = repo->index->cache[nr];
 502                 strbuf_setlen(&name, name_base_len);
 503                 strbuf_addstr(&name, ce->name);
 504
 505                 if (S_ISREG(ce->ce_mode) &&
 506                     match_pathspec(repo->index, pathspec, name.buf, name.len, 0, NULL,
 507                                    S_ISDIR(ce->ce_mode) ||
 508                                    S_ISGITLINK(ce->ce_mode))) {
 509                         /*
 510                          * If CE_VALID is on, we assume worktree file and its
 511                          * cache entry are identical, even if worktree file has
 512                          * been modified, so use cache version instead
 513                          */
 514                         if (cached || (ce->ce_flags & CE_VALID) ||
 515                             ce_skip_worktree(ce)) {
 516                                 if (ce_stage(ce) || ce_intent_to_add(ce))
 517                                         continue;
 518                                 hit |= grep_oid(opt, &ce->oid, name.buf,
 519                                                  0, name.buf);
 520                         } else {
 521                                 hit |= grep_file(opt, name.buf);
 522                         }
 523                 } else if (recurse_submodules && S_ISGITLINK(ce->ce_mode) &&
 524                            submodule_path_match(repo->index, pathspec, name.buf, NULL)) {
 525                         hit |= grep_submodule(opt, pathspec, NULL, ce->name, ce->name);
 526                 } else {
 527                         continue;
 528                 }
 529
 530                 if (ce_stage(ce)) {
 531                         do {
 532                                 nr++;
 533                         } while (nr < repo->index->cache_nr &&
 534                                  !strcmp(ce->name, repo->index->cache[nr]->name));
 535                         nr--; /* compensate for loop control */
 536                 }
 537                 if (hit && opt->status_only)
 538                         break;
 539         }
 540
 541         strbuf_release(&name);
 542         return hit;
 543 }
 544
 545 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
 546                      struct tree_desc *tree, struct strbuf *base, int tn_len,
 547                      int check_attr)
 548 {
 549         struct repository *repo = opt->repo;
 550         int hit = 0;
 551         enum interesting match = entry_not_interesting;
 552         struct name_entry entry;
 553         int old_baselen = base->len;
 554         struct strbuf name = STRBUF_INIT;
 555         int name_base_len = 0;
 556         if (repo->submodule_prefix) {
 557                 strbuf_addstr(&name, repo->submodule_prefix);
 558                 name_base_len = name.len;
 559         }
 560
 561         while (tree_entry(tree, &entry)) {
 562                 int te_len = tree_entry_len(&entry);
 563
 564                 if (match != all_entries_interesting) {
 565                         strbuf_addstr(&name, base->buf + tn_len);
 566                         match = tree_entry_interesting(repo->index,
 567                                                        &entry, &name,
 568                                                        0, pathspec);
 569                         strbuf_setlen(&name, name_base_len);
 570
 571                         if (match == all_entries_not_interesting)
 572                                 break;
 573                         if (match == entry_not_interesting)
 574                                 continue;
 575                 }
 576
 577                 strbuf_add(base, entry.path, te_len);
 578
 579                 if (S_ISREG(entry.mode)) {
 580                         hit |= grep_oid(opt, &entry.oid, base->buf, tn_len,
 581                                          check_attr ? base->buf + tn_len : NULL);
 582                 } else if (S_ISDIR(entry.mode)) {
 583                         enum object_type type;
 584                         struct tree_desc sub;
 585                         void *data;
 586                         unsigned long size;
 587
 588                         data = lock_and_read_oid_file(&entry.oid, &type, &size);
 589                         if (!data)
 590                                 die(_("unable to read tree (%s)"),
 591                                     oid_to_hex(&entry.oid));
 592
 593                         strbuf_addch(base, '/');
 594                         init_tree_desc(&sub, data, size);
 595                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
 596                                          check_attr);
 597                         free(data);
 598                 } else if (recurse_submodules && S_ISGITLINK(entry.mode)) {
 599                         hit |= grep_submodule(opt, pathspec, &entry.oid,
 600                                               base->buf, base->buf + tn_len);
 601                 }
 602
 603                 strbuf_setlen(base, old_baselen);
 604
 605                 if (hit && opt->status_only)
 606                         break;
 607         }
 608
 609         strbuf_release(&name);
 610         return hit;
 611 }
 612
 613 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
 614                        struct object *obj, const char *name, const char *path)
 615 {
 616         if (obj->type == OBJ_BLOB)
 617                 return grep_oid(opt, &obj->oid, name, 0, path);
 618         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 619                 struct tree_desc tree;
 620                 void *data;
 621                 unsigned long size;
 622                 struct strbuf base;
 623                 int hit, len;
 624
 625                 grep_read_lock();
 626                 data = read_object_with_reference(&obj->oid, tree_type,
 627                                                   &size, NULL);
 628                 grep_read_unlock();
 629
 630                 if (!data)
 631                         die(_("unable to read tree (%s)"), oid_to_hex(&obj->oid));
 632
 633                 len = name ? strlen(name) : 0;
 634                 strbuf_init(&base, PATH_MAX + len + 1);
 635                 if (len) {
 636                         strbuf_add(&base, name, len);
 637                         strbuf_addch(&base, ':');
 638                 }
 639                 init_tree_desc(&tree, data, size);
 640                 hit = grep_tree(opt, pathspec, &tree, &base, base.len,
 641                                 obj->type == OBJ_COMMIT);
 642                 strbuf_release(&base);
 643                 free(data);
 644                 return hit;
 645         }
 646         die(_("unable to grep from object of type %s"), type_name(obj->type));
 647 }
 648
 649 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
 650                         const struct object_array *list)
 651 {
 652         unsigned int i;
 653         int hit = 0;
 654         const unsigned int nr = list->nr;
 655
 656         for (i = 0; i < nr; i++) {
 657                 struct object *real_obj;
 658                 real_obj = deref_tag(opt->repo, list->objects[i].item,
 659                                      NULL, 0);
 660
 661                 /* load the gitmodules file for this rev */
 662                 if (recurse_submodules) {
 663                         submodule_free(opt->repo);
 664                         gitmodules_config_oid(&real_obj->oid);
 665                 }
 666                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name,
 667                                 list->objects[i].path)) {
 668                         hit = 1;
 669                         if (opt->status_only)
 670                                 break;
 671                 }
 672         }
 673         return hit;
 674 }
 675
 676 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
 677                           int exc_std, int use_index)
 678 {
 679         struct dir_struct dir;
 680         int i, hit = 0;
 681
 682         memset(&dir, 0, sizeof(dir));
 683         if (!use_index)
 684                 dir.flags |= DIR_NO_GITLINKS;
 685         if (exc_std)
 686                 setup_standard_excludes(&dir);
 687
 688         fill_directory(&dir, opt->repo->index, pathspec);
 689         for (i = 0; i < dir.nr; i++) {
 690                 if (!dir_path_match(opt->repo->index, dir.entries[i], pathspec, 0, NULL))
 691                         continue;
 692                 hit |= grep_file(opt, dir.entries[i]->name);
 693                 if (hit && opt->status_only)
 694                         break;
 695         }
 696         return hit;
 697 }
 698
 699 static int context_callback(const struct option *opt, const char *arg,
 700                             int unset)
 701 {
 702         struct grep_opt *grep_opt = opt->value;
 703         int value;
 704         const char *endp;
 705
 706         if (unset) {
 707                 grep_opt->pre_context = grep_opt->post_context = 0;
 708                 return 0;
 709         }
 710         value = strtol(arg, (char **)&endp, 10);
 711         if (*endp) {
 712                 return error(_("switch `%c' expects a numerical value"),
 713                              opt->short_name);
 714         }
 715         grep_opt->pre_context = grep_opt->post_context = value;
 716         return 0;
 717 }
 718
 719 static int file_callback(const struct option *opt, const char *arg, int unset)
 720 {
 721         struct grep_opt *grep_opt = opt->value;
 722         int from_stdin;
 723         FILE *patterns;
 724         int lno = 0;
 725         struct strbuf sb = STRBUF_INIT;
 726
 727         BUG_ON_OPT_NEG(unset);
 728
 729         from_stdin = !strcmp(arg, "-");
 730         patterns = from_stdin ? stdin : fopen(arg, "r");
 731         if (!patterns)
 732                 die_errno(_("cannot open '%s'"), arg);
 733         while (strbuf_getline(&sb, patterns) == 0) {
 734                 /* ignore empty line like grep does */
 735                 if (sb.len == 0)
 736                         continue;
 737
 738                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
 739                                 GREP_PATTERN);
 740         }
 741         if (!from_stdin)
 742                 fclose(patterns);
 743         strbuf_release(&sb);
 744         return 0;
 745 }
 746
 747 static int not_callback(const struct option *opt, const char *arg, int unset)
 748 {
 749         struct grep_opt *grep_opt = opt->value;
 750         BUG_ON_OPT_NEG(unset);
 751         BUG_ON_OPT_ARG(arg);
 752         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 753         return 0;
 754 }
 755
 756 static int and_callback(const struct option *opt, const char *arg, int unset)
 757 {
 758         struct grep_opt *grep_opt = opt->value;
 759         BUG_ON_OPT_NEG(unset);
 760         BUG_ON_OPT_ARG(arg);
 761         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 762         return 0;
 763 }
 764
 765 static int open_callback(const struct option *opt, const char *arg, int unset)
 766 {
 767         struct grep_opt *grep_opt = opt->value;
 768         BUG_ON_OPT_NEG(unset);
 769         BUG_ON_OPT_ARG(arg);
 770         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 771         return 0;
 772 }
 773
 774 static int close_callback(const struct option *opt, const char *arg, int unset)
 775 {
 776         struct grep_opt *grep_opt = opt->value;
 777         BUG_ON_OPT_NEG(unset);
 778         BUG_ON_OPT_ARG(arg);
 779         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 780         return 0;
 781 }
 782
 783 static int pattern_callback(const struct option *opt, const char *arg,
 784                             int unset)
 785 {
 786         struct grep_opt *grep_opt = opt->value;
 787         BUG_ON_OPT_NEG(unset);
 788         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 789         return 0;
 790 }
 791
 792 int cmd_grep(int argc, const char **argv, const char *prefix)
 793 {
 794         int hit = 0;
 795         int cached = 0, untracked = 0, opt_exclude = -1;
 796         int seen_dashdash = 0;
 797         int external_grep_allowed__ignored;
 798         const char *show_in_pager = NULL, *default_pager = "dummy";
 799         struct grep_opt opt;
 800         struct object_array list = OBJECT_ARRAY_INIT;
 801         struct pathspec pathspec;
 802         struct string_list path_list = STRING_LIST_INIT_NODUP;
 803         int i;
 804         int dummy;
 805         int use_index = 1;
 806         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
 807         int allow_revs;
 808
 809         struct option options[] = {
 810                 OPT_BOOL(0, "cached", &cached,
 811                         N_("search in index instead of in the work tree")),
 812                 OPT_NEGBIT(0, "no-index", &use_index,
 813                          N_("find in contents not managed by git"), 1),
 814                 OPT_BOOL(0, "untracked", &untracked,
 815                         N_("search in both tracked and untracked files")),
 816                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
 817                             N_("ignore files specified via '.gitignore'"), 1),
 818                 OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
 819                          N_("recursively search in each submodule")),
 820                 OPT_GROUP(""),
 821                 OPT_BOOL('v', "invert-match", &opt.invert,
 822                         N_("show non-matching lines")),
 823                 OPT_BOOL('i', "ignore-case", &opt.ignore_case,
 824                         N_("case insensitive matching")),
 825                 OPT_BOOL('w', "word-regexp", &opt.word_regexp,
 826                         N_("match patterns only at word boundaries")),
 827                 OPT_SET_INT('a', "text", &opt.binary,
 828                         N_("process binary files as text"), GREP_BINARY_TEXT),
 829                 OPT_SET_INT('I', NULL, &opt.binary,
 830                         N_("don't match patterns in binary files"),
 831                         GREP_BINARY_NOMATCH),
 832                 OPT_BOOL(0, "textconv", &opt.allow_textconv,
 833                          N_("process binary files with textconv filters")),
 834                 OPT_SET_INT('r', "recursive", &opt.max_depth,
 835                             N_("search in subdirectories (default)"), -1),
 836                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
 837                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
 838                         NULL, 1 },
 839                 OPT_GROUP(""),
 840                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
 841                             N_("use extended POSIX regular expressions"),
 842                             GREP_PATTERN_TYPE_ERE),
 843                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
 844                             N_("use basic POSIX regular expressions (default)"),
 845                             GREP_PATTERN_TYPE_BRE),
 846                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
 847                             N_("interpret patterns as fixed strings"),
 848                             GREP_PATTERN_TYPE_FIXED),
 849                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
 850                             N_("use Perl-compatible regular expressions"),
 851                             GREP_PATTERN_TYPE_PCRE),
 852                 OPT_GROUP(""),
 853                 OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
 854                 OPT_BOOL(0, "column", &opt.columnnum, N_("show column number of first match")),
 855                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
 856                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
 857                 OPT_NEGBIT(0, "full-name", &opt.relative,
 858                         N_("show filenames relative to top directory"), 1),
 859                 OPT_BOOL('l', "files-with-matches", &opt.name_only,
 860                         N_("show only filenames instead of matching lines")),
 861                 OPT_BOOL(0, "name-only", &opt.name_only,
 862                         N_("synonym for --files-with-matches")),
 863                 OPT_BOOL('L', "files-without-match",
 864                         &opt.unmatch_name_only,
 865                         N_("show only the names of files without match")),
 866                 OPT_BOOL_F('z', "null", &opt.null_following_name,
 867                            N_("print NUL after filenames"),
 868                            PARSE_OPT_NOCOMPLETE),
 869                 OPT_BOOL('o', "only-matching", &opt.only_matching,
 870                         N_("show only matching parts of a line")),
 871                 OPT_BOOL('c', "count", &opt.count,
 872                         N_("show the number of matches instead of matching lines")),
 873                 OPT__COLOR(&opt.color, N_("highlight matches")),
 874                 OPT_BOOL(0, "break", &opt.file_break,
 875                         N_("print empty line between matches from different files")),
 876                 OPT_BOOL(0, "heading", &opt.heading,
 877                         N_("show filename only once above matches from same file")),
 878                 OPT_GROUP(""),
 879                 OPT_CALLBACK('C', "context", &opt, N_("n"),
 880                         N_("show <n> context lines before and after matches"),
 881                         context_callback),
 882                 OPT_INTEGER('B', "before-context", &opt.pre_context,
 883                         N_("show <n> context lines before matches")),
 884                 OPT_INTEGER('A', "after-context", &opt.post_context,
 885                         N_("show <n> context lines after matches")),
 886                 OPT_INTEGER(0, "threads", &num_threads,
 887                         N_("use <n> worker threads")),
 888                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
 889                         context_callback),
 890                 OPT_BOOL('p', "show-function", &opt.funcname,
 891                         N_("show a line with the function name before matches")),
 892                 OPT_BOOL('W', "function-context", &opt.funcbody,
 893                         N_("show the surrounding function")),
 894                 OPT_GROUP(""),
 895                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
 896                         N_("read patterns from file"), file_callback),
 897                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
 898                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
 899                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
 900                   N_("combine patterns specified with -e"),
 901                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
 902                 OPT_BOOL(0, "or", &dummy, ""),
 903                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
 904                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
 905                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
 906                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 907                   open_callback },
 908                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
 909                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 910                   close_callback },
 911                 OPT__QUIET(&opt.status_only,
 912                            N_("indicate hit with exit status without output")),
 913                 OPT_BOOL(0, "all-match", &opt.all_match,
 914                         N_("show only matches from files that match all patterns")),
 915                 OPT_SET_INT_F(0, "debug", &opt.debug,
 916                               N_("show parse tree for grep expression"),
 917                               1, PARSE_OPT_HIDDEN),
 918                 OPT_GROUP(""),
 919                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
 920                         N_("pager"), N_("show matching files in the pager"),
 921                         PARSE_OPT_OPTARG | PARSE_OPT_NOCOMPLETE,
 922                         NULL, (intptr_t)default_pager },
 923                 OPT_BOOL_F(0, "ext-grep", &external_grep_allowed__ignored,
 924                            N_("allow calling of grep(1) (ignored by this build)"),
 925                            PARSE_OPT_NOCOMPLETE),
 926                 OPT_END()
 927         };
 928
 929         init_grep_defaults(the_repository);
 930         git_config(grep_cmd_config, NULL);
 931         grep_init(&opt, the_repository, prefix);
 932
 933         /*
 934          * If there is no -- then the paths must exist in the working
 935          * tree.  If there is no explicit pattern specified with -e or
 936          * -f, we take the first unrecognized non option to be the
 937          * pattern, but then what follows it must be zero or more
 938          * valid refs up to the -- (if exists), and then existing
 939          * paths.  If there is an explicit pattern, then the first
 940          * unrecognized non option is the beginning of the refs list
 941          * that continues up to the -- (if exists), and then paths.
 942          */
 943         argc = parse_options(argc, argv, prefix, options, grep_usage,
 944                              PARSE_OPT_KEEP_DASHDASH |
 945                              PARSE_OPT_STOP_AT_NON_OPTION);
 946         grep_commit_pattern_type(pattern_type_arg, &opt);
 947
 948         if (use_index && !startup_info->have_repository) {
 949                 int fallback = 0;
 950                 git_config_get_bool("grep.fallbacktonoindex", &fallback);
 951                 if (fallback)
 952                         use_index = 0;
 953                 else
 954                         /* die the same way as if we did it at the beginning */
 955                         setup_git_directory();
 956         }
 957
 958         /*
 959          * skip a -- separator; we know it cannot be
 960          * separating revisions from pathnames if
 961          * we haven't even had any patterns yet
 962          */
 963         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
 964                 argv++;
 965                 argc--;
 966         }
 967
 968         /* First unrecognized non-option token */
 969         if (argc > 0 && !opt.pattern_list) {
 970                 append_grep_pattern(&opt, argv[0], "command line", 0,
 971                                     GREP_PATTERN);
 972                 argv++;
 973                 argc--;
 974         }
 975
 976         if (show_in_pager == default_pager)
 977                 show_in_pager = git_pager(1);
 978         if (show_in_pager) {
 979                 opt.color = 0;
 980                 opt.name_only = 1;
 981                 opt.null_following_name = 1;
 982                 opt.output_priv = &path_list;
 983                 opt.output = append_path;
 984                 string_list_append(&path_list, show_in_pager);
 985         }
 986
 987         if (!opt.pattern_list)
 988                 die(_("no pattern given"));
 989
 990         /* --only-matching has no effect with --invert. */
 991         if (opt.invert)
 992                 opt.only_matching = 0;
 993
 994         /*
 995          * We have to find "--" in a separate pass, because its presence
 996          * influences how we will parse arguments that come before it.
 997          */
 998         for (i = 0; i < argc; i++) {
 999                 if (!strcmp(argv[i], "--")) {
1000                         seen_dashdash = 1;
1001                         break;
1002                 }
1003         }
1004
1005         /*
1006          * Resolve any rev arguments. If we have a dashdash, then everything up
1007          * to it must resolve as a rev. If not, then we stop at the first
1008          * non-rev and assume everything else is a path.
1009          */
1010         allow_revs = use_index && !untracked;
1011         for (i = 0; i < argc; i++) {
1012                 const char *arg = argv[i];
1013                 struct object_id oid;
1014                 struct object_context oc;
1015                 struct object *object;
1016
1017                 if (!strcmp(arg, "--")) {
1018                         i++;
1019                         break;
1020                 }
1021
1022                 if (!allow_revs) {
1023                         if (seen_dashdash)
1024                                 die(_("--no-index or --untracked cannot be used with revs"));
1025                         break;
1026                 }
1027
1028                 if (get_oid_with_context(the_repository, arg,
1029                                          GET_OID_RECORD_PATH,
1030                                          &oid, &oc)) {
1031                         if (seen_dashdash)
1032                                 die(_("unable to resolve revision: %s"), arg);
1033                         break;
1034                 }
1035
1036                 object = parse_object_or_die(&oid, arg);
1037                 if (!seen_dashdash)
1038                         verify_non_filename(prefix, arg);
1039                 add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
1040                 free(oc.path);
1041         }
1042
1043         /*
1044          * Anything left over is presumed to be a path. But in the non-dashdash
1045          * "do what I mean" case, we verify and complain when that isn't true.
1046          */
1047         if (!seen_dashdash) {
1048                 int j;
1049                 for (j = i; j < argc; j++)
1050                         verify_filename(prefix, argv[j], j == i && allow_revs);
1051         }
1052
1053         parse_pathspec(&pathspec, 0,
1054                        PATHSPEC_PREFER_CWD |
1055                        (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
1056                        prefix, argv + i);
1057         pathspec.max_depth = opt.max_depth;
1058         pathspec.recursive = 1;
1059         pathspec.recurse_submodules = !!recurse_submodules;
1060
1061         if (list.nr || cached || show_in_pager) {
1062                 if (num_threads > 1)
1063                         warning(_("invalid option combination, ignoring --threads"));
1064                 num_threads = 1;
1065         } else if (!HAVE_THREADS && num_threads > 1) {
1066                 warning(_("no threads support, ignoring --threads"));
1067                 num_threads = 1;
1068         } else if (num_threads < 0)
1069                 die(_("invalid number of threads specified (%d)"), num_threads);
1070         else if (num_threads == 0)
1071                 num_threads = HAVE_THREADS ? GREP_NUM_THREADS_DEFAULT : 1;
1072
1073         if (num_threads > 1) {
1074                 if (!HAVE_THREADS)
1075                         BUG("Somebody got num_threads calculation wrong!");
1076                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1077                     && (opt.pre_context || opt.post_context ||
1078                         opt.file_break || opt.funcbody))
1079                         skip_first_line = 1;
1080                 start_threads(&opt);
1081         } else {
1082                 /*
1083                  * The compiled patterns on the main path are only
1084                  * used when not using threading. Otherwise
1085                  * start_threads() above calls compile_grep_patterns()
1086                  * for each thread.
1087                  */
1088                 compile_grep_patterns(&opt);
1089         }
1090
1091         if (show_in_pager && (cached || list.nr))
1092                 die(_("--open-files-in-pager only works on the worktree"));
1093
1094         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1095                 const char *pager = path_list.items[0].string;
1096                 int len = strlen(pager);
1097
1098                 if (len > 4 && is_dir_sep(pager[len - 5]))
1099                         pager += len - 4;
1100
1101                 if (opt.ignore_case && !strcmp("less", pager))
1102                         string_list_append(&path_list, "-I");
1103
1104                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1105                         struct strbuf buf = STRBUF_INIT;
1106                         strbuf_addf(&buf, "+/%s%s",
1107                                         strcmp("less", pager) ? "" : "*",
1108                                         opt.pattern_list->pattern);
1109                         string_list_append(&path_list, buf.buf);
1110                         strbuf_detach(&buf, NULL);
1111                 }
1112         }
1113
1114         if (recurse_submodules && (!use_index || untracked))
1115                 die(_("option not supported with --recurse-submodules"));
1116
1117         if (!show_in_pager && !opt.status_only)
1118                 setup_pager();
1119
1120         if (!use_index && (untracked || cached))
1121                 die(_("--cached or --untracked cannot be used with --no-index"));
1122
1123         if (!use_index || untracked) {
1124                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1125                 hit = grep_directory(&opt, &pathspec, use_exclude, use_index);
1126         } else if (0 <= opt_exclude) {
1127                 die(_("--[no-]exclude-standard cannot be used for tracked contents"));
1128         } else if (!list.nr) {
1129                 if (!cached)
1130                         setup_work_tree();
1131
1132                 hit = grep_cache(&opt, &pathspec, cached);
1133         } else {
1134                 if (cached)
1135                         die(_("both --cached and trees are given"));
1136
1137                 hit = grep_objects(&opt, &pathspec, &list);
1138         }
1139
1140         if (num_threads > 1)
1141                 hit |= wait_all();
1142         if (hit && show_in_pager)
1143                 run_pager(&opt, prefix);
1144         clear_pathspec(&pathspec);
1145         free_grep_patterns(&opt);
1146         return !hit;
1147 }