Merge branch 'rt/zlib-smaller-window'
[git] / 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 #include "thread-utils.h"
21
22 static char const * const grep_usage[] = {
23         "git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]",
24         NULL
25 };
26
27 static int use_threads = 1;
28
29 #ifndef NO_PTHREADS
30 #define THREADS 8
31 static pthread_t threads[THREADS];
32
33 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
34                        const char *name);
35 static void *load_file(const char *filename, size_t *sz);
36
37 enum work_type {WORK_SHA1, WORK_FILE};
38
39 /* We use one producer thread and THREADS consumer
40  * threads. The producer adds struct work_items to 'todo' and the
41  * consumers pick work items from the same array.
42  */
43 struct work_item {
44         enum work_type type;
45         char *name;
46
47         /* if type == WORK_SHA1, then 'identifier' is a SHA1,
48          * otherwise type == WORK_FILE, and 'identifier' is a NUL
49          * terminated filename.
50          */
51         void *identifier;
52         char done;
53         struct strbuf out;
54 };
55
56 /* In the range [todo_done, todo_start) in 'todo' we have work_items
57  * that have been or are processed by a consumer thread. We haven't
58  * written the result for these to stdout yet.
59  *
60  * The work_items in [todo_start, todo_end) are waiting to be picked
61  * up by a consumer thread.
62  *
63  * The ranges are modulo TODO_SIZE.
64  */
65 #define TODO_SIZE 128
66 static struct work_item todo[TODO_SIZE];
67 static int todo_start;
68 static int todo_end;
69 static int todo_done;
70
71 /* Has all work items been added? */
72 static int all_work_added;
73
74 /* This lock protects all the variables above. */
75 static pthread_mutex_t grep_mutex;
76
77 /* Used to serialize calls to read_sha1_file. */
78 static pthread_mutex_t read_sha1_mutex;
79
80 #define grep_lock() pthread_mutex_lock(&grep_mutex)
81 #define grep_unlock() pthread_mutex_unlock(&grep_mutex)
82 #define read_sha1_lock() pthread_mutex_lock(&read_sha1_mutex)
83 #define read_sha1_unlock() pthread_mutex_unlock(&read_sha1_mutex)
84
85 /* Signalled when a new work_item is added to todo. */
86 static pthread_cond_t cond_add;
87
88 /* Signalled when the result from one work_item is written to
89  * stdout.
90  */
91 static pthread_cond_t cond_write;
92
93 /* Signalled when we are finished with everything. */
94 static pthread_cond_t cond_result;
95
96 static int skip_first_line;
97
98 static void add_work(enum work_type type, char *name, void *id)
99 {
100         grep_lock();
101
102         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
103                 pthread_cond_wait(&cond_write, &grep_mutex);
104         }
105
106         todo[todo_end].type = type;
107         todo[todo_end].name = name;
108         todo[todo_end].identifier = id;
109         todo[todo_end].done = 0;
110         strbuf_reset(&todo[todo_end].out);
111         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
112
113         pthread_cond_signal(&cond_add);
114         grep_unlock();
115 }
116
117 static struct work_item *get_work(void)
118 {
119         struct work_item *ret;
120
121         grep_lock();
122         while (todo_start == todo_end && !all_work_added) {
123                 pthread_cond_wait(&cond_add, &grep_mutex);
124         }
125
126         if (todo_start == todo_end && all_work_added) {
127                 ret = NULL;
128         } else {
129                 ret = &todo[todo_start];
130                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
131         }
132         grep_unlock();
133         return ret;
134 }
135
136 static void grep_sha1_async(struct grep_opt *opt, char *name,
137                             const unsigned char *sha1)
138 {
139         unsigned char *s;
140         s = xmalloc(20);
141         memcpy(s, sha1, 20);
142         add_work(WORK_SHA1, name, s);
143 }
144
145 static void grep_file_async(struct grep_opt *opt, char *name,
146                             const char *filename)
147 {
148         add_work(WORK_FILE, name, xstrdup(filename));
149 }
150
151 static void work_done(struct work_item *w)
152 {
153         int old_done;
154
155         grep_lock();
156         w->done = 1;
157         old_done = todo_done;
158         for(; todo[todo_done].done && todo_done != todo_start;
159             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
160                 w = &todo[todo_done];
161                 if (w->out.len) {
162                         const char *p = w->out.buf;
163                         size_t len = w->out.len;
164
165                         /* Skip the leading hunk mark of the first file. */
166                         if (skip_first_line) {
167                                 while (len) {
168                                         len--;
169                                         if (*p++ == '\n')
170                                                 break;
171                                 }
172                                 skip_first_line = 0;
173                         }
174
175                         write_or_die(1, p, len);
176                 }
177                 free(w->name);
178                 free(w->identifier);
179         }
180
181         if (old_done != todo_done)
182                 pthread_cond_signal(&cond_write);
183
184         if (all_work_added && todo_done == todo_end)
185                 pthread_cond_signal(&cond_result);
186
187         grep_unlock();
188 }
189
190 static void *run(void *arg)
191 {
192         int hit = 0;
193         struct grep_opt *opt = arg;
194
195         while (1) {
196                 struct work_item *w = get_work();
197                 if (!w)
198                         break;
199
200                 opt->output_priv = w;
201                 if (w->type == WORK_SHA1) {
202                         unsigned long sz;
203                         void* data = load_sha1(w->identifier, &sz, w->name);
204
205                         if (data) {
206                                 hit |= grep_buffer(opt, w->name, data, sz);
207                                 free(data);
208                         }
209                 } else if (w->type == WORK_FILE) {
210                         size_t sz;
211                         void* data = load_file(w->identifier, &sz);
212                         if (data) {
213                                 hit |= grep_buffer(opt, w->name, data, sz);
214                                 free(data);
215                         }
216                 } else {
217                         assert(0);
218                 }
219
220                 work_done(w);
221         }
222         free_grep_patterns(arg);
223         free(arg);
224
225         return (void*) (intptr_t) hit;
226 }
227
228 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
229 {
230         struct work_item *w = opt->output_priv;
231         strbuf_add(&w->out, buf, size);
232 }
233
234 static void start_threads(struct grep_opt *opt)
235 {
236         int i;
237
238         pthread_mutex_init(&grep_mutex, NULL);
239         pthread_mutex_init(&read_sha1_mutex, NULL);
240         pthread_cond_init(&cond_add, NULL);
241         pthread_cond_init(&cond_write, NULL);
242         pthread_cond_init(&cond_result, NULL);
243
244         for (i = 0; i < ARRAY_SIZE(todo); i++) {
245                 strbuf_init(&todo[i].out, 0);
246         }
247
248         for (i = 0; i < ARRAY_SIZE(threads); i++) {
249                 int err;
250                 struct grep_opt *o = grep_opt_dup(opt);
251                 o->output = strbuf_out;
252                 compile_grep_patterns(o);
253                 err = pthread_create(&threads[i], NULL, run, o);
254
255                 if (err)
256                         die(_("grep: failed to create thread: %s"),
257                             strerror(err));
258         }
259 }
260
261 static int wait_all(void)
262 {
263         int hit = 0;
264         int i;
265
266         grep_lock();
267         all_work_added = 1;
268
269         /* Wait until all work is done. */
270         while (todo_done != todo_end)
271                 pthread_cond_wait(&cond_result, &grep_mutex);
272
273         /* Wake up all the consumer threads so they can see that there
274          * is no more work to do.
275          */
276         pthread_cond_broadcast(&cond_add);
277         grep_unlock();
278
279         for (i = 0; i < ARRAY_SIZE(threads); i++) {
280                 void *h;
281                 pthread_join(threads[i], &h);
282                 hit |= (int) (intptr_t) h;
283         }
284
285         pthread_mutex_destroy(&grep_mutex);
286         pthread_mutex_destroy(&read_sha1_mutex);
287         pthread_cond_destroy(&cond_add);
288         pthread_cond_destroy(&cond_write);
289         pthread_cond_destroy(&cond_result);
290
291         return hit;
292 }
293 #else /* !NO_PTHREADS */
294 #define read_sha1_lock()
295 #define read_sha1_unlock()
296
297 static int wait_all(void)
298 {
299         return 0;
300 }
301 #endif
302
303 static int grep_config(const char *var, const char *value, void *cb)
304 {
305         struct grep_opt *opt = cb;
306         char *color = NULL;
307
308         switch (userdiff_config(var, value)) {
309         case 0: break;
310         case -1: return -1;
311         default: return 0;
312         }
313
314         if (!strcmp(var, "grep.extendedregexp")) {
315                 if (git_config_bool(var, value))
316                         opt->regflags |= REG_EXTENDED;
317                 else
318                         opt->regflags &= ~REG_EXTENDED;
319                 return 0;
320         }
321
322         if (!strcmp(var, "grep.linenumber")) {
323                 opt->linenum = git_config_bool(var, value);
324                 return 0;
325         }
326
327         if (!strcmp(var, "color.grep"))
328                 opt->color = git_config_colorbool(var, value, -1);
329         else if (!strcmp(var, "color.grep.context"))
330                 color = opt->color_context;
331         else if (!strcmp(var, "color.grep.filename"))
332                 color = opt->color_filename;
333         else if (!strcmp(var, "color.grep.function"))
334                 color = opt->color_function;
335         else if (!strcmp(var, "color.grep.linenumber"))
336                 color = opt->color_lineno;
337         else if (!strcmp(var, "color.grep.match"))
338                 color = opt->color_match;
339         else if (!strcmp(var, "color.grep.selected"))
340                 color = opt->color_selected;
341         else if (!strcmp(var, "color.grep.separator"))
342                 color = opt->color_sep;
343         else
344                 return git_color_default_config(var, value, cb);
345         if (color) {
346                 if (!value)
347                         return config_error_nonbool(var);
348                 color_parse(value, var, color);
349         }
350         return 0;
351 }
352
353 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
354 {
355         void *data;
356
357         if (use_threads) {
358                 read_sha1_lock();
359                 data = read_sha1_file(sha1, type, size);
360                 read_sha1_unlock();
361         } else {
362                 data = read_sha1_file(sha1, type, size);
363         }
364         return data;
365 }
366
367 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
368                        const char *name)
369 {
370         enum object_type type;
371         void *data = lock_and_read_sha1_file(sha1, &type, size);
372
373         if (!data)
374                 error(_("'%s': unable to read %s"), name, sha1_to_hex(sha1));
375
376         return data;
377 }
378
379 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
380                      const char *filename, int tree_name_len)
381 {
382         struct strbuf pathbuf = STRBUF_INIT;
383         char *name;
384
385         if (opt->relative && opt->prefix_length) {
386                 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
387                                     opt->prefix);
388                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
389         } else {
390                 strbuf_addstr(&pathbuf, filename);
391         }
392
393         name = strbuf_detach(&pathbuf, NULL);
394
395 #ifndef NO_PTHREADS
396         if (use_threads) {
397                 grep_sha1_async(opt, name, sha1);
398                 return 0;
399         } else
400 #endif
401         {
402                 int hit;
403                 unsigned long sz;
404                 void *data = load_sha1(sha1, &sz, name);
405                 if (!data)
406                         hit = 0;
407                 else
408                         hit = grep_buffer(opt, name, data, sz);
409
410                 free(data);
411                 free(name);
412                 return hit;
413         }
414 }
415
416 static void *load_file(const char *filename, size_t *sz)
417 {
418         struct stat st;
419         char *data;
420         int i;
421
422         if (lstat(filename, &st) < 0) {
423         err_ret:
424                 if (errno != ENOENT)
425                         error(_("'%s': %s"), filename, strerror(errno));
426                 return NULL;
427         }
428         if (!S_ISREG(st.st_mode))
429                 return NULL;
430         *sz = xsize_t(st.st_size);
431         i = open(filename, O_RDONLY);
432         if (i < 0)
433                 goto err_ret;
434         data = xmalloc(*sz + 1);
435         if (st.st_size != read_in_full(i, data, *sz)) {
436                 error(_("'%s': short read %s"), filename, strerror(errno));
437                 close(i);
438                 free(data);
439                 return NULL;
440         }
441         close(i);
442         data[*sz] = 0;
443         return data;
444 }
445
446 static int grep_file(struct grep_opt *opt, const char *filename)
447 {
448         struct strbuf buf = STRBUF_INIT;
449         char *name;
450
451         if (opt->relative && opt->prefix_length)
452                 quote_path_relative(filename, -1, &buf, opt->prefix);
453         else
454                 strbuf_addstr(&buf, filename);
455         name = strbuf_detach(&buf, NULL);
456
457 #ifndef NO_PTHREADS
458         if (use_threads) {
459                 grep_file_async(opt, name, filename);
460                 return 0;
461         } else
462 #endif
463         {
464                 int hit;
465                 size_t sz;
466                 void *data = load_file(filename, &sz);
467                 if (!data)
468                         hit = 0;
469                 else
470                         hit = grep_buffer(opt, name, data, sz);
471
472                 free(data);
473                 free(name);
474                 return hit;
475         }
476 }
477
478 static void append_path(struct grep_opt *opt, const void *data, size_t len)
479 {
480         struct string_list *path_list = opt->output_priv;
481
482         if (len == 1 && *(const char *)data == '\0')
483                 return;
484         string_list_append(path_list, xstrndup(data, len));
485 }
486
487 static void run_pager(struct grep_opt *opt, const char *prefix)
488 {
489         struct string_list *path_list = opt->output_priv;
490         const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
491         int i, status;
492
493         for (i = 0; i < path_list->nr; i++)
494                 argv[i] = path_list->items[i].string;
495         argv[path_list->nr] = NULL;
496
497         if (prefix && chdir(prefix))
498                 die(_("Failed to chdir: %s"), prefix);
499         status = run_command_v_opt(argv, RUN_USING_SHELL);
500         if (status)
501                 exit(status);
502         free(argv);
503 }
504
505 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
506 {
507         int hit = 0;
508         int nr;
509         read_cache();
510
511         for (nr = 0; nr < active_nr; nr++) {
512                 struct cache_entry *ce = active_cache[nr];
513                 if (!S_ISREG(ce->ce_mode))
514                         continue;
515                 if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
516                         continue;
517                 /*
518                  * If CE_VALID is on, we assume worktree file and its cache entry
519                  * are identical, even if worktree file has been modified, so use
520                  * cache version instead
521                  */
522                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
523                         if (ce_stage(ce))
524                                 continue;
525                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
526                 }
527                 else
528                         hit |= grep_file(opt, ce->name);
529                 if (ce_stage(ce)) {
530                         do {
531                                 nr++;
532                         } while (nr < active_nr &&
533                                  !strcmp(ce->name, active_cache[nr]->name));
534                         nr--; /* compensate for loop control */
535                 }
536                 if (hit && opt->status_only)
537                         break;
538         }
539         return hit;
540 }
541
542 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
543                      struct tree_desc *tree, struct strbuf *base, int tn_len)
544 {
545         int hit = 0, match = 0;
546         struct name_entry entry;
547         int old_baselen = base->len;
548
549         while (tree_entry(tree, &entry)) {
550                 int te_len = tree_entry_len(entry.path, entry.sha1);
551
552                 if (match != 2) {
553                         match = tree_entry_interesting(&entry, base, tn_len, pathspec);
554                         if (match < 0)
555                                 break;
556                         if (match == 0)
557                                 continue;
558                 }
559
560                 strbuf_add(base, entry.path, te_len);
561
562                 if (S_ISREG(entry.mode)) {
563                         hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
564                 }
565                 else if (S_ISDIR(entry.mode)) {
566                         enum object_type type;
567                         struct tree_desc sub;
568                         void *data;
569                         unsigned long size;
570
571                         data = lock_and_read_sha1_file(entry.sha1, &type, &size);
572                         if (!data)
573                                 die(_("unable to read tree (%s)"),
574                                     sha1_to_hex(entry.sha1));
575
576                         strbuf_addch(base, '/');
577                         init_tree_desc(&sub, data, size);
578                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
579                         free(data);
580                 }
581                 strbuf_setlen(base, old_baselen);
582
583                 if (hit && opt->status_only)
584                         break;
585         }
586         return hit;
587 }
588
589 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
590                        struct object *obj, const char *name)
591 {
592         if (obj->type == OBJ_BLOB)
593                 return grep_sha1(opt, obj->sha1, name, 0);
594         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
595                 struct tree_desc tree;
596                 void *data;
597                 unsigned long size;
598                 struct strbuf base;
599                 int hit, len;
600
601                 data = read_object_with_reference(obj->sha1, tree_type,
602                                                   &size, NULL);
603                 if (!data)
604                         die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
605
606                 len = name ? strlen(name) : 0;
607                 strbuf_init(&base, PATH_MAX + len + 1);
608                 if (len) {
609                         strbuf_add(&base, name, len);
610                         strbuf_addch(&base, ':');
611                 }
612                 init_tree_desc(&tree, data, size);
613                 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
614                 strbuf_release(&base);
615                 free(data);
616                 return hit;
617         }
618         die(_("unable to grep from object of type %s"), typename(obj->type));
619 }
620
621 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
622                         const struct object_array *list)
623 {
624         unsigned int i;
625         int hit = 0;
626         const unsigned int nr = list->nr;
627
628         for (i = 0; i < nr; i++) {
629                 struct object *real_obj;
630                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
631                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
632                         hit = 1;
633                         if (opt->status_only)
634                                 break;
635                 }
636         }
637         return hit;
638 }
639
640 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec)
641 {
642         struct dir_struct dir;
643         int i, hit = 0;
644
645         memset(&dir, 0, sizeof(dir));
646         setup_standard_excludes(&dir);
647
648         fill_directory(&dir, pathspec->raw);
649         for (i = 0; i < dir.nr; i++) {
650                 const char *name = dir.entries[i]->name;
651                 int namelen = strlen(name);
652                 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
653                         continue;
654                 hit |= grep_file(opt, dir.entries[i]->name);
655                 if (hit && opt->status_only)
656                         break;
657         }
658         return hit;
659 }
660
661 static int context_callback(const struct option *opt, const char *arg,
662                             int unset)
663 {
664         struct grep_opt *grep_opt = opt->value;
665         int value;
666         const char *endp;
667
668         if (unset) {
669                 grep_opt->pre_context = grep_opt->post_context = 0;
670                 return 0;
671         }
672         value = strtol(arg, (char **)&endp, 10);
673         if (*endp) {
674                 return error(_("switch `%c' expects a numerical value"),
675                              opt->short_name);
676         }
677         grep_opt->pre_context = grep_opt->post_context = value;
678         return 0;
679 }
680
681 static int file_callback(const struct option *opt, const char *arg, int unset)
682 {
683         struct grep_opt *grep_opt = opt->value;
684         int from_stdin = !strcmp(arg, "-");
685         FILE *patterns;
686         int lno = 0;
687         struct strbuf sb = STRBUF_INIT;
688
689         patterns = from_stdin ? stdin : fopen(arg, "r");
690         if (!patterns)
691                 die_errno(_("cannot open '%s'"), arg);
692         while (strbuf_getline(&sb, patterns, '\n') == 0) {
693                 char *s;
694                 size_t len;
695
696                 /* ignore empty line like grep does */
697                 if (sb.len == 0)
698                         continue;
699
700                 s = strbuf_detach(&sb, &len);
701                 append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
702         }
703         if (!from_stdin)
704                 fclose(patterns);
705         strbuf_release(&sb);
706         return 0;
707 }
708
709 static int not_callback(const struct option *opt, const char *arg, int unset)
710 {
711         struct grep_opt *grep_opt = opt->value;
712         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
713         return 0;
714 }
715
716 static int and_callback(const struct option *opt, const char *arg, int unset)
717 {
718         struct grep_opt *grep_opt = opt->value;
719         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
720         return 0;
721 }
722
723 static int open_callback(const struct option *opt, const char *arg, int unset)
724 {
725         struct grep_opt *grep_opt = opt->value;
726         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
727         return 0;
728 }
729
730 static int close_callback(const struct option *opt, const char *arg, int unset)
731 {
732         struct grep_opt *grep_opt = opt->value;
733         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
734         return 0;
735 }
736
737 static int pattern_callback(const struct option *opt, const char *arg,
738                             int unset)
739 {
740         struct grep_opt *grep_opt = opt->value;
741         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
742         return 0;
743 }
744
745 static int help_callback(const struct option *opt, const char *arg, int unset)
746 {
747         return -1;
748 }
749
750 int cmd_grep(int argc, const char **argv, const char *prefix)
751 {
752         int hit = 0;
753         int cached = 0;
754         int seen_dashdash = 0;
755         int external_grep_allowed__ignored;
756         const char *show_in_pager = NULL, *default_pager = "dummy";
757         struct grep_opt opt;
758         struct object_array list = OBJECT_ARRAY_INIT;
759         const char **paths = NULL;
760         struct pathspec pathspec;
761         struct string_list path_list = STRING_LIST_INIT_NODUP;
762         int i;
763         int dummy;
764         int use_index = 1;
765         enum {
766                 pattern_type_unspecified = 0,
767                 pattern_type_bre,
768                 pattern_type_ere,
769                 pattern_type_fixed,
770                 pattern_type_pcre,
771         };
772         int pattern_type = pattern_type_unspecified;
773
774         struct option options[] = {
775                 OPT_BOOLEAN(0, "cached", &cached,
776                         "search in index instead of in the work tree"),
777                 OPT_BOOLEAN(0, "index", &use_index,
778                         "--no-index finds in contents not managed by git"),
779                 OPT_GROUP(""),
780                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
781                         "show non-matching lines"),
782                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
783                         "case insensitive matching"),
784                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
785                         "match patterns only at word boundaries"),
786                 OPT_SET_INT('a', "text", &opt.binary,
787                         "process binary files as text", GREP_BINARY_TEXT),
788                 OPT_SET_INT('I', NULL, &opt.binary,
789                         "don't match patterns in binary files",
790                         GREP_BINARY_NOMATCH),
791                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
792                         "descend at most <depth> levels", PARSE_OPT_NONEG,
793                         NULL, 1 },
794                 OPT_GROUP(""),
795                 OPT_SET_INT('E', "extended-regexp", &pattern_type,
796                             "use extended POSIX regular expressions",
797                             pattern_type_ere),
798                 OPT_SET_INT('G', "basic-regexp", &pattern_type,
799                             "use basic POSIX regular expressions (default)",
800                             pattern_type_bre),
801                 OPT_SET_INT('F', "fixed-strings", &pattern_type,
802                             "interpret patterns as fixed strings",
803                             pattern_type_fixed),
804                 OPT_SET_INT('P', "perl-regexp", &pattern_type,
805                             "use Perl-compatible regular expressions",
806                             pattern_type_pcre),
807                 OPT_GROUP(""),
808                 OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
809                 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
810                 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
811                 OPT_NEGBIT(0, "full-name", &opt.relative,
812                         "show filenames relative to top directory", 1),
813                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
814                         "show only filenames instead of matching lines"),
815                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
816                         "synonym for --files-with-matches"),
817                 OPT_BOOLEAN('L', "files-without-match",
818                         &opt.unmatch_name_only,
819                         "show only the names of files without match"),
820                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
821                         "print NUL after filenames"),
822                 OPT_BOOLEAN('c', "count", &opt.count,
823                         "show the number of matches instead of matching lines"),
824                 OPT__COLOR(&opt.color, "highlight matches"),
825                 OPT_BOOLEAN(0, "break", &opt.file_break,
826                         "print empty line between matches from different files"),
827                 OPT_BOOLEAN(0, "heading", &opt.heading,
828                         "show filename only once above matches from same file"),
829                 OPT_GROUP(""),
830                 OPT_CALLBACK('C', "context", &opt, "n",
831                         "show <n> context lines before and after matches",
832                         context_callback),
833                 OPT_INTEGER('B', "before-context", &opt.pre_context,
834                         "show <n> context lines before matches"),
835                 OPT_INTEGER('A', "after-context", &opt.post_context,
836                         "show <n> context lines after matches"),
837                 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
838                         context_callback),
839                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
840                         "show a line with the function name before matches"),
841                 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
842                         "show the surrounding function"),
843                 OPT_GROUP(""),
844                 OPT_CALLBACK('f', NULL, &opt, "file",
845                         "read patterns from file", file_callback),
846                 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
847                         "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
848                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
849                   "combine patterns specified with -e",
850                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
851                 OPT_BOOLEAN(0, "or", &dummy, ""),
852                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
853                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
854                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
855                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
856                   open_callback },
857                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
858                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
859                   close_callback },
860                 OPT__QUIET(&opt.status_only,
861                            "indicate hit with exit status without output"),
862                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
863                         "show only matches from files that match all patterns"),
864                 OPT_GROUP(""),
865                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
866                         "pager", "show matching files in the pager",
867                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
868                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
869                             "allow calling of grep(1) (ignored by this build)"),
870                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
871                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
872                 OPT_END()
873         };
874
875         /*
876          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
877          * to show usage information and exit.
878          */
879         if (argc == 2 && !strcmp(argv[1], "-h"))
880                 usage_with_options(grep_usage, options);
881
882         memset(&opt, 0, sizeof(opt));
883         opt.prefix = prefix;
884         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
885         opt.relative = 1;
886         opt.pathname = 1;
887         opt.pattern_tail = &opt.pattern_list;
888         opt.header_tail = &opt.header_list;
889         opt.regflags = REG_NEWLINE;
890         opt.max_depth = -1;
891
892         strcpy(opt.color_context, "");
893         strcpy(opt.color_filename, "");
894         strcpy(opt.color_function, "");
895         strcpy(opt.color_lineno, "");
896         strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
897         strcpy(opt.color_selected, "");
898         strcpy(opt.color_sep, GIT_COLOR_CYAN);
899         opt.color = -1;
900         git_config(grep_config, &opt);
901         if (opt.color == -1)
902                 opt.color = git_use_color_default;
903
904         /*
905          * If there is no -- then the paths must exist in the working
906          * tree.  If there is no explicit pattern specified with -e or
907          * -f, we take the first unrecognized non option to be the
908          * pattern, but then what follows it must be zero or more
909          * valid refs up to the -- (if exists), and then existing
910          * paths.  If there is an explicit pattern, then the first
911          * unrecognized non option is the beginning of the refs list
912          * that continues up to the -- (if exists), and then paths.
913          */
914         argc = parse_options(argc, argv, prefix, options, grep_usage,
915                              PARSE_OPT_KEEP_DASHDASH |
916                              PARSE_OPT_STOP_AT_NON_OPTION |
917                              PARSE_OPT_NO_INTERNAL_HELP);
918         switch (pattern_type) {
919         case pattern_type_fixed:
920                 opt.fixed = 1;
921                 opt.pcre = 0;
922                 break;
923         case pattern_type_bre:
924                 opt.fixed = 0;
925                 opt.pcre = 0;
926                 opt.regflags &= ~REG_EXTENDED;
927                 break;
928         case pattern_type_ere:
929                 opt.fixed = 0;
930                 opt.pcre = 0;
931                 opt.regflags |= REG_EXTENDED;
932                 break;
933         case pattern_type_pcre:
934                 opt.fixed = 0;
935                 opt.pcre = 1;
936                 break;
937         default:
938                 break; /* nothing */
939         }
940
941         if (use_index && !startup_info->have_repository)
942                 /* die the same way as if we did it at the beginning */
943                 setup_git_directory();
944
945         /*
946          * skip a -- separator; we know it cannot be
947          * separating revisions from pathnames if
948          * we haven't even had any patterns yet
949          */
950         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
951                 argv++;
952                 argc--;
953         }
954
955         /* First unrecognized non-option token */
956         if (argc > 0 && !opt.pattern_list) {
957                 append_grep_pattern(&opt, argv[0], "command line", 0,
958                                     GREP_PATTERN);
959                 argv++;
960                 argc--;
961         }
962
963         if (show_in_pager == default_pager)
964                 show_in_pager = git_pager(1);
965         if (show_in_pager) {
966                 opt.color = 0;
967                 opt.name_only = 1;
968                 opt.null_following_name = 1;
969                 opt.output_priv = &path_list;
970                 opt.output = append_path;
971                 string_list_append(&path_list, show_in_pager);
972                 use_threads = 0;
973         }
974
975         if (!opt.pattern_list)
976                 die(_("no pattern given."));
977         if (!opt.fixed && opt.ignore_case)
978                 opt.regflags |= REG_ICASE;
979
980 #ifndef NO_PTHREADS
981         if (online_cpus() == 1 || !grep_threads_ok(&opt))
982                 use_threads = 0;
983
984         if (use_threads) {
985                 if (opt.pre_context || opt.post_context || opt.file_break ||
986                     opt.funcbody)
987                         skip_first_line = 1;
988                 start_threads(&opt);
989         }
990 #else
991         use_threads = 0;
992 #endif
993
994         compile_grep_patterns(&opt);
995
996         /* Check revs and then paths */
997         for (i = 0; i < argc; i++) {
998                 const char *arg = argv[i];
999                 unsigned char sha1[20];
1000                 /* Is it a rev? */
1001                 if (!get_sha1(arg, sha1)) {
1002                         struct object *object = parse_object(sha1);
1003                         if (!object)
1004                                 die(_("bad object %s"), arg);
1005                         add_object_array(object, arg, &list);
1006                         continue;
1007                 }
1008                 if (!strcmp(arg, "--")) {
1009                         i++;
1010                         seen_dashdash = 1;
1011                 }
1012                 break;
1013         }
1014
1015         /* The rest are paths */
1016         if (!seen_dashdash) {
1017                 int j;
1018                 for (j = i; j < argc; j++)
1019                         verify_filename(prefix, argv[j]);
1020         }
1021
1022         paths = get_pathspec(prefix, argv + i);
1023         init_pathspec(&pathspec, paths);
1024         pathspec.max_depth = opt.max_depth;
1025         pathspec.recursive = 1;
1026
1027         if (show_in_pager && (cached || list.nr))
1028                 die(_("--open-files-in-pager only works on the worktree"));
1029
1030         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1031                 const char *pager = path_list.items[0].string;
1032                 int len = strlen(pager);
1033
1034                 if (len > 4 && is_dir_sep(pager[len - 5]))
1035                         pager += len - 4;
1036
1037                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1038                         struct strbuf buf = STRBUF_INIT;
1039                         strbuf_addf(&buf, "+/%s%s",
1040                                         strcmp("less", pager) ? "" : "*",
1041                                         opt.pattern_list->pattern);
1042                         string_list_append(&path_list, buf.buf);
1043                         strbuf_detach(&buf, NULL);
1044                 }
1045         }
1046
1047         if (!show_in_pager)
1048                 setup_pager();
1049
1050
1051         if (!use_index) {
1052                 if (cached)
1053                         die(_("--cached cannot be used with --no-index."));
1054                 if (list.nr)
1055                         die(_("--no-index cannot be used with revs."));
1056                 hit = grep_directory(&opt, &pathspec);
1057         } else if (!list.nr) {
1058                 if (!cached)
1059                         setup_work_tree();
1060
1061                 hit = grep_cache(&opt, &pathspec, cached);
1062         } else {
1063                 if (cached)
1064                         die(_("both --cached and trees are given."));
1065                 hit = grep_objects(&opt, &pathspec, &list);
1066         }
1067
1068         if (use_threads)
1069                 hit |= wait_all();
1070         if (hit && show_in_pager)
1071                 run_pager(&opt, prefix);
1072         free_grep_patterns(&opt);
1073         return !hit;
1074 }