Merge branch 'maint-1.7.3' into maint
[git/git.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);
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 read_sha1_lock();
602 data = read_object_with_reference(obj->sha1, tree_type,
603 &size, NULL);
604 read_sha1_unlock();
605
606 if (!data)
607 die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
608
609 len = name ? strlen(name) : 0;
610 strbuf_init(&base, PATH_MAX + len + 1);
611 if (len) {
612 strbuf_add(&base, name, len);
613 strbuf_addch(&base, ':');
614 }
615 init_tree_desc(&tree, data, size);
616 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
617 strbuf_release(&base);
618 free(data);
619 return hit;
620 }
621 die(_("unable to grep from object of type %s"), typename(obj->type));
622 }
623
624 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
625 const struct object_array *list)
626 {
627 unsigned int i;
628 int hit = 0;
629 const unsigned int nr = list->nr;
630
631 for (i = 0; i < nr; i++) {
632 struct object *real_obj;
633 real_obj = deref_tag(list->objects[i].item, NULL, 0);
634 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
635 hit = 1;
636 if (opt->status_only)
637 break;
638 }
639 }
640 return hit;
641 }
642
643 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec)
644 {
645 struct dir_struct dir;
646 int i, hit = 0;
647
648 memset(&dir, 0, sizeof(dir));
649 setup_standard_excludes(&dir);
650
651 fill_directory(&dir, pathspec->raw);
652 for (i = 0; i < dir.nr; i++) {
653 const char *name = dir.entries[i]->name;
654 int namelen = strlen(name);
655 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
656 continue;
657 hit |= grep_file(opt, dir.entries[i]->name);
658 if (hit && opt->status_only)
659 break;
660 }
661 return hit;
662 }
663
664 static int context_callback(const struct option *opt, const char *arg,
665 int unset)
666 {
667 struct grep_opt *grep_opt = opt->value;
668 int value;
669 const char *endp;
670
671 if (unset) {
672 grep_opt->pre_context = grep_opt->post_context = 0;
673 return 0;
674 }
675 value = strtol(arg, (char **)&endp, 10);
676 if (*endp) {
677 return error(_("switch `%c' expects a numerical value"),
678 opt->short_name);
679 }
680 grep_opt->pre_context = grep_opt->post_context = value;
681 return 0;
682 }
683
684 static int file_callback(const struct option *opt, const char *arg, int unset)
685 {
686 struct grep_opt *grep_opt = opt->value;
687 int from_stdin = !strcmp(arg, "-");
688 FILE *patterns;
689 int lno = 0;
690 struct strbuf sb = STRBUF_INIT;
691
692 patterns = from_stdin ? stdin : fopen(arg, "r");
693 if (!patterns)
694 die_errno(_("cannot open '%s'"), arg);
695 while (strbuf_getline(&sb, patterns, '\n') == 0) {
696 char *s;
697 size_t len;
698
699 /* ignore empty line like grep does */
700 if (sb.len == 0)
701 continue;
702
703 s = strbuf_detach(&sb, &len);
704 append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
705 }
706 if (!from_stdin)
707 fclose(patterns);
708 strbuf_release(&sb);
709 return 0;
710 }
711
712 static int not_callback(const struct option *opt, const char *arg, int unset)
713 {
714 struct grep_opt *grep_opt = opt->value;
715 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
716 return 0;
717 }
718
719 static int and_callback(const struct option *opt, const char *arg, int unset)
720 {
721 struct grep_opt *grep_opt = opt->value;
722 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
723 return 0;
724 }
725
726 static int open_callback(const struct option *opt, const char *arg, int unset)
727 {
728 struct grep_opt *grep_opt = opt->value;
729 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
730 return 0;
731 }
732
733 static int close_callback(const struct option *opt, const char *arg, int unset)
734 {
735 struct grep_opt *grep_opt = opt->value;
736 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
737 return 0;
738 }
739
740 static int pattern_callback(const struct option *opt, const char *arg,
741 int unset)
742 {
743 struct grep_opt *grep_opt = opt->value;
744 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
745 return 0;
746 }
747
748 static int help_callback(const struct option *opt, const char *arg, int unset)
749 {
750 return -1;
751 }
752
753 int cmd_grep(int argc, const char **argv, const char *prefix)
754 {
755 int hit = 0;
756 int cached = 0;
757 int seen_dashdash = 0;
758 int external_grep_allowed__ignored;
759 const char *show_in_pager = NULL, *default_pager = "dummy";
760 struct grep_opt opt;
761 struct object_array list = OBJECT_ARRAY_INIT;
762 const char **paths = NULL;
763 struct pathspec pathspec;
764 struct string_list path_list = STRING_LIST_INIT_NODUP;
765 int i;
766 int dummy;
767 int use_index = 1;
768 enum {
769 pattern_type_unspecified = 0,
770 pattern_type_bre,
771 pattern_type_ere,
772 pattern_type_fixed,
773 pattern_type_pcre,
774 };
775 int pattern_type = pattern_type_unspecified;
776
777 struct option options[] = {
778 OPT_BOOLEAN(0, "cached", &cached,
779 "search in index instead of in the work tree"),
780 OPT_BOOLEAN(0, "index", &use_index,
781 "--no-index finds in contents not managed by git"),
782 OPT_GROUP(""),
783 OPT_BOOLEAN('v', "invert-match", &opt.invert,
784 "show non-matching lines"),
785 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
786 "case insensitive matching"),
787 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
788 "match patterns only at word boundaries"),
789 OPT_SET_INT('a', "text", &opt.binary,
790 "process binary files as text", GREP_BINARY_TEXT),
791 OPT_SET_INT('I', NULL, &opt.binary,
792 "don't match patterns in binary files",
793 GREP_BINARY_NOMATCH),
794 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
795 "descend at most <depth> levels", PARSE_OPT_NONEG,
796 NULL, 1 },
797 OPT_GROUP(""),
798 OPT_SET_INT('E', "extended-regexp", &pattern_type,
799 "use extended POSIX regular expressions",
800 pattern_type_ere),
801 OPT_SET_INT('G', "basic-regexp", &pattern_type,
802 "use basic POSIX regular expressions (default)",
803 pattern_type_bre),
804 OPT_SET_INT('F', "fixed-strings", &pattern_type,
805 "interpret patterns as fixed strings",
806 pattern_type_fixed),
807 OPT_SET_INT('P', "perl-regexp", &pattern_type,
808 "use Perl-compatible regular expressions",
809 pattern_type_pcre),
810 OPT_GROUP(""),
811 OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
812 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
813 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
814 OPT_NEGBIT(0, "full-name", &opt.relative,
815 "show filenames relative to top directory", 1),
816 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
817 "show only filenames instead of matching lines"),
818 OPT_BOOLEAN(0, "name-only", &opt.name_only,
819 "synonym for --files-with-matches"),
820 OPT_BOOLEAN('L', "files-without-match",
821 &opt.unmatch_name_only,
822 "show only the names of files without match"),
823 OPT_BOOLEAN('z', "null", &opt.null_following_name,
824 "print NUL after filenames"),
825 OPT_BOOLEAN('c', "count", &opt.count,
826 "show the number of matches instead of matching lines"),
827 OPT__COLOR(&opt.color, "highlight matches"),
828 OPT_BOOLEAN(0, "break", &opt.file_break,
829 "print empty line between matches from different files"),
830 OPT_BOOLEAN(0, "heading", &opt.heading,
831 "show filename only once above matches from same file"),
832 OPT_GROUP(""),
833 OPT_CALLBACK('C', "context", &opt, "n",
834 "show <n> context lines before and after matches",
835 context_callback),
836 OPT_INTEGER('B', "before-context", &opt.pre_context,
837 "show <n> context lines before matches"),
838 OPT_INTEGER('A', "after-context", &opt.post_context,
839 "show <n> context lines after matches"),
840 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
841 context_callback),
842 OPT_BOOLEAN('p', "show-function", &opt.funcname,
843 "show a line with the function name before matches"),
844 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
845 "show the surrounding function"),
846 OPT_GROUP(""),
847 OPT_CALLBACK('f', NULL, &opt, "file",
848 "read patterns from file", file_callback),
849 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
850 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
851 { OPTION_CALLBACK, 0, "and", &opt, NULL,
852 "combine patterns specified with -e",
853 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
854 OPT_BOOLEAN(0, "or", &dummy, ""),
855 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
856 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
857 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
858 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
859 open_callback },
860 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
861 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
862 close_callback },
863 OPT__QUIET(&opt.status_only,
864 "indicate hit with exit status without output"),
865 OPT_BOOLEAN(0, "all-match", &opt.all_match,
866 "show only matches from files that match all patterns"),
867 OPT_GROUP(""),
868 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
869 "pager", "show matching files in the pager",
870 PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
871 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
872 "allow calling of grep(1) (ignored by this build)"),
873 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
874 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
875 OPT_END()
876 };
877
878 /*
879 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
880 * to show usage information and exit.
881 */
882 if (argc == 2 && !strcmp(argv[1], "-h"))
883 usage_with_options(grep_usage, options);
884
885 memset(&opt, 0, sizeof(opt));
886 opt.prefix = prefix;
887 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
888 opt.relative = 1;
889 opt.pathname = 1;
890 opt.pattern_tail = &opt.pattern_list;
891 opt.header_tail = &opt.header_list;
892 opt.regflags = REG_NEWLINE;
893 opt.max_depth = -1;
894
895 strcpy(opt.color_context, "");
896 strcpy(opt.color_filename, "");
897 strcpy(opt.color_function, "");
898 strcpy(opt.color_lineno, "");
899 strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
900 strcpy(opt.color_selected, "");
901 strcpy(opt.color_sep, GIT_COLOR_CYAN);
902 opt.color = -1;
903 git_config(grep_config, &opt);
904
905 /*
906 * If there is no -- then the paths must exist in the working
907 * tree. If there is no explicit pattern specified with -e or
908 * -f, we take the first unrecognized non option to be the
909 * pattern, but then what follows it must be zero or more
910 * valid refs up to the -- (if exists), and then existing
911 * paths. If there is an explicit pattern, then the first
912 * unrecognized non option is the beginning of the refs list
913 * that continues up to the -- (if exists), and then paths.
914 */
915 argc = parse_options(argc, argv, prefix, options, grep_usage,
916 PARSE_OPT_KEEP_DASHDASH |
917 PARSE_OPT_STOP_AT_NON_OPTION |
918 PARSE_OPT_NO_INTERNAL_HELP);
919 switch (pattern_type) {
920 case pattern_type_fixed:
921 opt.fixed = 1;
922 opt.pcre = 0;
923 break;
924 case pattern_type_bre:
925 opt.fixed = 0;
926 opt.pcre = 0;
927 opt.regflags &= ~REG_EXTENDED;
928 break;
929 case pattern_type_ere:
930 opt.fixed = 0;
931 opt.pcre = 0;
932 opt.regflags |= REG_EXTENDED;
933 break;
934 case pattern_type_pcre:
935 opt.fixed = 0;
936 opt.pcre = 1;
937 break;
938 default:
939 break; /* nothing */
940 }
941
942 if (use_index && !startup_info->have_repository)
943 /* die the same way as if we did it at the beginning */
944 setup_git_directory();
945
946 /*
947 * skip a -- separator; we know it cannot be
948 * separating revisions from pathnames if
949 * we haven't even had any patterns yet
950 */
951 if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
952 argv++;
953 argc--;
954 }
955
956 /* First unrecognized non-option token */
957 if (argc > 0 && !opt.pattern_list) {
958 append_grep_pattern(&opt, argv[0], "command line", 0,
959 GREP_PATTERN);
960 argv++;
961 argc--;
962 }
963
964 if (show_in_pager == default_pager)
965 show_in_pager = git_pager(1);
966 if (show_in_pager) {
967 opt.color = 0;
968 opt.name_only = 1;
969 opt.null_following_name = 1;
970 opt.output_priv = &path_list;
971 opt.output = append_path;
972 string_list_append(&path_list, show_in_pager);
973 use_threads = 0;
974 }
975
976 if (!opt.pattern_list)
977 die(_("no pattern given."));
978 if (!opt.fixed && opt.ignore_case)
979 opt.regflags |= REG_ICASE;
980
981 #ifndef NO_PTHREADS
982 if (online_cpus() == 1 || !grep_threads_ok(&opt))
983 use_threads = 0;
984
985 if (use_threads) {
986 if (opt.pre_context || opt.post_context || opt.file_break ||
987 opt.funcbody)
988 skip_first_line = 1;
989 start_threads(&opt);
990 }
991 #else
992 use_threads = 0;
993 #endif
994
995 compile_grep_patterns(&opt);
996
997 /* Check revs and then paths */
998 for (i = 0; i < argc; i++) {
999 const char *arg = argv[i];
1000 unsigned char sha1[20];
1001 /* Is it a rev? */
1002 if (!get_sha1(arg, sha1)) {
1003 struct object *object = parse_object(sha1);
1004 if (!object)
1005 die(_("bad object %s"), arg);
1006 add_object_array(object, arg, &list);
1007 continue;
1008 }
1009 if (!strcmp(arg, "--")) {
1010 i++;
1011 seen_dashdash = 1;
1012 }
1013 break;
1014 }
1015
1016 /* The rest are paths */
1017 if (!seen_dashdash) {
1018 int j;
1019 for (j = i; j < argc; j++)
1020 verify_filename(prefix, argv[j]);
1021 }
1022
1023 paths = get_pathspec(prefix, argv + i);
1024 init_pathspec(&pathspec, paths);
1025 pathspec.max_depth = opt.max_depth;
1026 pathspec.recursive = 1;
1027
1028 if (show_in_pager && (cached || list.nr))
1029 die(_("--open-files-in-pager only works on the worktree"));
1030
1031 if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1032 const char *pager = path_list.items[0].string;
1033 int len = strlen(pager);
1034
1035 if (len > 4 && is_dir_sep(pager[len - 5]))
1036 pager += len - 4;
1037
1038 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1039 struct strbuf buf = STRBUF_INIT;
1040 strbuf_addf(&buf, "+/%s%s",
1041 strcmp("less", pager) ? "" : "*",
1042 opt.pattern_list->pattern);
1043 string_list_append(&path_list, buf.buf);
1044 strbuf_detach(&buf, NULL);
1045 }
1046 }
1047
1048 if (!show_in_pager)
1049 setup_pager();
1050
1051
1052 if (!use_index) {
1053 if (cached)
1054 die(_("--cached cannot be used with --no-index."));
1055 if (list.nr)
1056 die(_("--no-index cannot be used with revs."));
1057 hit = grep_directory(&opt, &pathspec);
1058 } else if (!list.nr) {
1059 if (!cached)
1060 setup_work_tree();
1061
1062 hit = grep_cache(&opt, &pathspec, cached);
1063 } else {
1064 if (cached)
1065 die(_("both --cached and trees are given."));
1066 hit = grep_objects(&opt, &pathspec, &list);
1067 }
1068
1069 if (use_threads)
1070 hit |= wait_all();
1071 if (hit && show_in_pager)
1072 run_pager(&opt, prefix);
1073 free_grep_patterns(&opt);
1074 return !hit;
1075 }