standardize brace placement in struct definitions
[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 print_hunk_marks_between_files;
97 static int printed_something;
98
99 static void add_work(enum work_type type, char *name, void *id)
100 {
101 grep_lock();
102
103 while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
104 pthread_cond_wait(&cond_write, &grep_mutex);
105 }
106
107 todo[todo_end].type = type;
108 todo[todo_end].name = name;
109 todo[todo_end].identifier = id;
110 todo[todo_end].done = 0;
111 strbuf_reset(&todo[todo_end].out);
112 todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
113
114 pthread_cond_signal(&cond_add);
115 grep_unlock();
116 }
117
118 static struct work_item *get_work(void)
119 {
120 struct work_item *ret;
121
122 grep_lock();
123 while (todo_start == todo_end && !all_work_added) {
124 pthread_cond_wait(&cond_add, &grep_mutex);
125 }
126
127 if (todo_start == todo_end && all_work_added) {
128 ret = NULL;
129 } else {
130 ret = &todo[todo_start];
131 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
132 }
133 grep_unlock();
134 return ret;
135 }
136
137 static void grep_sha1_async(struct grep_opt *opt, char *name,
138 const unsigned char *sha1)
139 {
140 unsigned char *s;
141 s = xmalloc(20);
142 memcpy(s, sha1, 20);
143 add_work(WORK_SHA1, name, s);
144 }
145
146 static void grep_file_async(struct grep_opt *opt, char *name,
147 const char *filename)
148 {
149 add_work(WORK_FILE, name, xstrdup(filename));
150 }
151
152 static void work_done(struct work_item *w)
153 {
154 int old_done;
155
156 grep_lock();
157 w->done = 1;
158 old_done = todo_done;
159 for(; todo[todo_done].done && todo_done != todo_start;
160 todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
161 w = &todo[todo_done];
162 if (w->out.len) {
163 if (print_hunk_marks_between_files && printed_something)
164 write_or_die(1, "--\n", 3);
165 write_or_die(1, w->out.buf, w->out.len);
166 printed_something = 1;
167 }
168 free(w->name);
169 free(w->identifier);
170 }
171
172 if (old_done != todo_done)
173 pthread_cond_signal(&cond_write);
174
175 if (all_work_added && todo_done == todo_end)
176 pthread_cond_signal(&cond_result);
177
178 grep_unlock();
179 }
180
181 static void *run(void *arg)
182 {
183 int hit = 0;
184 struct grep_opt *opt = arg;
185
186 while (1) {
187 struct work_item *w = get_work();
188 if (!w)
189 break;
190
191 opt->output_priv = w;
192 if (w->type == WORK_SHA1) {
193 unsigned long sz;
194 void* data = load_sha1(w->identifier, &sz, w->name);
195
196 if (data) {
197 hit |= grep_buffer(opt, w->name, data, sz);
198 free(data);
199 }
200 } else if (w->type == WORK_FILE) {
201 size_t sz;
202 void* data = load_file(w->identifier, &sz);
203 if (data) {
204 hit |= grep_buffer(opt, w->name, data, sz);
205 free(data);
206 }
207 } else {
208 assert(0);
209 }
210
211 work_done(w);
212 }
213 free_grep_patterns(arg);
214 free(arg);
215
216 return (void*) (intptr_t) hit;
217 }
218
219 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
220 {
221 struct work_item *w = opt->output_priv;
222 strbuf_add(&w->out, buf, size);
223 }
224
225 static void start_threads(struct grep_opt *opt)
226 {
227 int i;
228
229 pthread_mutex_init(&grep_mutex, NULL);
230 pthread_mutex_init(&read_sha1_mutex, NULL);
231 pthread_cond_init(&cond_add, NULL);
232 pthread_cond_init(&cond_write, NULL);
233 pthread_cond_init(&cond_result, NULL);
234
235 for (i = 0; i < ARRAY_SIZE(todo); i++) {
236 strbuf_init(&todo[i].out, 0);
237 }
238
239 for (i = 0; i < ARRAY_SIZE(threads); i++) {
240 int err;
241 struct grep_opt *o = grep_opt_dup(opt);
242 o->output = strbuf_out;
243 compile_grep_patterns(o);
244 err = pthread_create(&threads[i], NULL, run, o);
245
246 if (err)
247 die("grep: failed to create thread: %s",
248 strerror(err));
249 }
250 }
251
252 static int wait_all(void)
253 {
254 int hit = 0;
255 int i;
256
257 grep_lock();
258 all_work_added = 1;
259
260 /* Wait until all work is done. */
261 while (todo_done != todo_end)
262 pthread_cond_wait(&cond_result, &grep_mutex);
263
264 /* Wake up all the consumer threads so they can see that there
265 * is no more work to do.
266 */
267 pthread_cond_broadcast(&cond_add);
268 grep_unlock();
269
270 for (i = 0; i < ARRAY_SIZE(threads); i++) {
271 void *h;
272 pthread_join(threads[i], &h);
273 hit |= (int) (intptr_t) h;
274 }
275
276 pthread_mutex_destroy(&grep_mutex);
277 pthread_mutex_destroy(&read_sha1_mutex);
278 pthread_cond_destroy(&cond_add);
279 pthread_cond_destroy(&cond_write);
280 pthread_cond_destroy(&cond_result);
281
282 return hit;
283 }
284 #else /* !NO_PTHREADS */
285 #define read_sha1_lock()
286 #define read_sha1_unlock()
287
288 static int wait_all(void)
289 {
290 return 0;
291 }
292 #endif
293
294 static int grep_config(const char *var, const char *value, void *cb)
295 {
296 struct grep_opt *opt = cb;
297 char *color = NULL;
298
299 switch (userdiff_config(var, value)) {
300 case 0: break;
301 case -1: return -1;
302 default: return 0;
303 }
304
305 if (!strcmp(var, "color.grep"))
306 opt->color = git_config_colorbool(var, value, -1);
307 else if (!strcmp(var, "color.grep.context"))
308 color = opt->color_context;
309 else if (!strcmp(var, "color.grep.filename"))
310 color = opt->color_filename;
311 else if (!strcmp(var, "color.grep.function"))
312 color = opt->color_function;
313 else if (!strcmp(var, "color.grep.linenumber"))
314 color = opt->color_lineno;
315 else if (!strcmp(var, "color.grep.match"))
316 color = opt->color_match;
317 else if (!strcmp(var, "color.grep.selected"))
318 color = opt->color_selected;
319 else if (!strcmp(var, "color.grep.separator"))
320 color = opt->color_sep;
321 else
322 return git_color_default_config(var, value, cb);
323 if (color) {
324 if (!value)
325 return config_error_nonbool(var);
326 color_parse(value, var, color);
327 }
328 return 0;
329 }
330
331 /*
332 * Return non-zero if max_depth is negative or path has no more then max_depth
333 * slashes.
334 */
335 static int accept_subdir(const char *path, int max_depth)
336 {
337 if (max_depth < 0)
338 return 1;
339
340 while ((path = strchr(path, '/')) != NULL) {
341 max_depth--;
342 if (max_depth < 0)
343 return 0;
344 path++;
345 }
346 return 1;
347 }
348
349 /*
350 * Return non-zero if name is a subdirectory of match and is not too deep.
351 */
352 static int is_subdir(const char *name, int namelen,
353 const char *match, int matchlen, int max_depth)
354 {
355 if (matchlen > namelen || strncmp(name, match, matchlen))
356 return 0;
357
358 if (name[matchlen] == '\0') /* exact match */
359 return 1;
360
361 if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
362 return accept_subdir(name + matchlen + 1, max_depth);
363
364 return 0;
365 }
366
367 /*
368 * git grep pathspecs are somewhat different from diff-tree pathspecs;
369 * pathname wildcards are allowed.
370 */
371 static int pathspec_matches(const char **paths, const char *name, int max_depth)
372 {
373 int namelen, i;
374 if (!paths || !*paths)
375 return accept_subdir(name, max_depth);
376 namelen = strlen(name);
377 for (i = 0; paths[i]; i++) {
378 const char *match = paths[i];
379 int matchlen = strlen(match);
380 const char *cp, *meta;
381
382 if (is_subdir(name, namelen, match, matchlen, max_depth))
383 return 1;
384 if (!fnmatch(match, name, 0))
385 return 1;
386 if (name[namelen-1] != '/')
387 continue;
388
389 /* We are being asked if the directory ("name") is worth
390 * descending into.
391 *
392 * Find the longest leading directory name that does
393 * not have metacharacter in the pathspec; the name
394 * we are looking at must overlap with that directory.
395 */
396 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
397 char ch = *cp;
398 if (ch == '*' || ch == '[' || ch == '?') {
399 meta = cp;
400 break;
401 }
402 }
403 if (!meta)
404 meta = cp; /* fully literal */
405
406 if (namelen <= meta - match) {
407 /* Looking at "Documentation/" and
408 * the pattern says "Documentation/howto/", or
409 * "Documentation/diff*.txt". The name we
410 * have should match prefix.
411 */
412 if (!memcmp(match, name, namelen))
413 return 1;
414 continue;
415 }
416
417 if (meta - match < namelen) {
418 /* Looking at "Documentation/howto/" and
419 * the pattern says "Documentation/h*";
420 * match up to "Do.../h"; this avoids descending
421 * into "Documentation/technical/".
422 */
423 if (!memcmp(match, name, meta - match))
424 return 1;
425 continue;
426 }
427 }
428 return 0;
429 }
430
431 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
432 {
433 void *data;
434
435 if (use_threads) {
436 read_sha1_lock();
437 data = read_sha1_file(sha1, type, size);
438 read_sha1_unlock();
439 } else {
440 data = read_sha1_file(sha1, type, size);
441 }
442 return data;
443 }
444
445 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
446 const char *name)
447 {
448 enum object_type type;
449 void *data = lock_and_read_sha1_file(sha1, &type, size);
450
451 if (!data)
452 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
453
454 return data;
455 }
456
457 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
458 const char *filename, int tree_name_len)
459 {
460 struct strbuf pathbuf = STRBUF_INIT;
461 char *name;
462
463 if (opt->relative && opt->prefix_length) {
464 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
465 opt->prefix);
466 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
467 } else {
468 strbuf_addstr(&pathbuf, filename);
469 }
470
471 name = strbuf_detach(&pathbuf, NULL);
472
473 #ifndef NO_PTHREADS
474 if (use_threads) {
475 grep_sha1_async(opt, name, sha1);
476 return 0;
477 } else
478 #endif
479 {
480 int hit;
481 unsigned long sz;
482 void *data = load_sha1(sha1, &sz, name);
483 if (!data)
484 hit = 0;
485 else
486 hit = grep_buffer(opt, name, data, sz);
487
488 free(data);
489 free(name);
490 return hit;
491 }
492 }
493
494 static void *load_file(const char *filename, size_t *sz)
495 {
496 struct stat st;
497 char *data;
498 int i;
499
500 if (lstat(filename, &st) < 0) {
501 err_ret:
502 if (errno != ENOENT)
503 error("'%s': %s", filename, strerror(errno));
504 return 0;
505 }
506 if (!S_ISREG(st.st_mode))
507 return 0;
508 *sz = xsize_t(st.st_size);
509 i = open(filename, O_RDONLY);
510 if (i < 0)
511 goto err_ret;
512 data = xmalloc(*sz + 1);
513 if (st.st_size != read_in_full(i, data, *sz)) {
514 error("'%s': short read %s", filename, strerror(errno));
515 close(i);
516 free(data);
517 return 0;
518 }
519 close(i);
520 data[*sz] = 0;
521 return data;
522 }
523
524 static int grep_file(struct grep_opt *opt, const char *filename)
525 {
526 struct strbuf buf = STRBUF_INIT;
527 char *name;
528
529 if (opt->relative && opt->prefix_length)
530 quote_path_relative(filename, -1, &buf, opt->prefix);
531 else
532 strbuf_addstr(&buf, filename);
533 name = strbuf_detach(&buf, NULL);
534
535 #ifndef NO_PTHREADS
536 if (use_threads) {
537 grep_file_async(opt, name, filename);
538 return 0;
539 } else
540 #endif
541 {
542 int hit;
543 size_t sz;
544 void *data = load_file(filename, &sz);
545 if (!data)
546 hit = 0;
547 else
548 hit = grep_buffer(opt, name, data, sz);
549
550 free(data);
551 free(name);
552 return hit;
553 }
554 }
555
556 static void append_path(struct grep_opt *opt, const void *data, size_t len)
557 {
558 struct string_list *path_list = opt->output_priv;
559
560 if (len == 1 && *(const char *)data == '\0')
561 return;
562 string_list_append(path_list, xstrndup(data, len));
563 }
564
565 static void run_pager(struct grep_opt *opt, const char *prefix)
566 {
567 struct string_list *path_list = opt->output_priv;
568 const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
569 int i, status;
570
571 for (i = 0; i < path_list->nr; i++)
572 argv[i] = path_list->items[i].string;
573 argv[path_list->nr] = NULL;
574
575 if (prefix && chdir(prefix))
576 die("Failed to chdir: %s", prefix);
577 status = run_command_v_opt(argv, RUN_USING_SHELL);
578 if (status)
579 exit(status);
580 free(argv);
581 }
582
583 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
584 {
585 int hit = 0;
586 int nr;
587 read_cache();
588
589 for (nr = 0; nr < active_nr; nr++) {
590 struct cache_entry *ce = active_cache[nr];
591 if (!S_ISREG(ce->ce_mode))
592 continue;
593 if (!pathspec_matches(paths, ce->name, opt->max_depth))
594 continue;
595 /*
596 * If CE_VALID is on, we assume worktree file and its cache entry
597 * are identical, even if worktree file has been modified, so use
598 * cache version instead
599 */
600 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
601 if (ce_stage(ce))
602 continue;
603 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
604 }
605 else
606 hit |= grep_file(opt, ce->name);
607 if (ce_stage(ce)) {
608 do {
609 nr++;
610 } while (nr < active_nr &&
611 !strcmp(ce->name, active_cache[nr]->name));
612 nr--; /* compensate for loop control */
613 }
614 if (hit && opt->status_only)
615 break;
616 }
617 return hit;
618 }
619
620 static int grep_tree(struct grep_opt *opt, const char **paths,
621 struct tree_desc *tree,
622 const char *tree_name, const char *base)
623 {
624 int len;
625 int hit = 0;
626 struct name_entry entry;
627 char *down;
628 int tn_len = strlen(tree_name);
629 struct strbuf pathbuf;
630
631 strbuf_init(&pathbuf, PATH_MAX + tn_len);
632
633 if (tn_len) {
634 strbuf_add(&pathbuf, tree_name, tn_len);
635 strbuf_addch(&pathbuf, ':');
636 tn_len = pathbuf.len;
637 }
638 strbuf_addstr(&pathbuf, base);
639 len = pathbuf.len;
640
641 while (tree_entry(tree, &entry)) {
642 int te_len = tree_entry_len(entry.path, entry.sha1);
643 pathbuf.len = len;
644 strbuf_add(&pathbuf, entry.path, te_len);
645
646 if (S_ISDIR(entry.mode))
647 /* Match "abc/" against pathspec to
648 * decide if we want to descend into "abc"
649 * directory.
650 */
651 strbuf_addch(&pathbuf, '/');
652
653 down = pathbuf.buf + tn_len;
654 if (!pathspec_matches(paths, down, opt->max_depth))
655 ;
656 else if (S_ISREG(entry.mode))
657 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
658 else if (S_ISDIR(entry.mode)) {
659 enum object_type type;
660 struct tree_desc sub;
661 void *data;
662 unsigned long size;
663
664 data = lock_and_read_sha1_file(entry.sha1, &type, &size);
665 if (!data)
666 die("unable to read tree (%s)",
667 sha1_to_hex(entry.sha1));
668 init_tree_desc(&sub, data, size);
669 hit |= grep_tree(opt, paths, &sub, tree_name, down);
670 free(data);
671 }
672 if (hit && opt->status_only)
673 break;
674 }
675 strbuf_release(&pathbuf);
676 return hit;
677 }
678
679 static int grep_object(struct grep_opt *opt, const char **paths,
680 struct object *obj, const char *name)
681 {
682 if (obj->type == OBJ_BLOB)
683 return grep_sha1(opt, obj->sha1, name, 0);
684 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
685 struct tree_desc tree;
686 void *data;
687 unsigned long size;
688 int hit;
689 data = read_object_with_reference(obj->sha1, tree_type,
690 &size, NULL);
691 if (!data)
692 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
693 init_tree_desc(&tree, data, size);
694 hit = grep_tree(opt, paths, &tree, name, "");
695 free(data);
696 return hit;
697 }
698 die("unable to grep from object of type %s", typename(obj->type));
699 }
700
701 static int grep_objects(struct grep_opt *opt, const char **paths,
702 const struct object_array *list)
703 {
704 unsigned int i;
705 int hit = 0;
706 const unsigned int nr = list->nr;
707
708 for (i = 0; i < nr; i++) {
709 struct object *real_obj;
710 real_obj = deref_tag(list->objects[i].item, NULL, 0);
711 if (grep_object(opt, paths, real_obj, list->objects[i].name)) {
712 hit = 1;
713 if (opt->status_only)
714 break;
715 }
716 }
717 return hit;
718 }
719
720 static int grep_directory(struct grep_opt *opt, const char **paths)
721 {
722 struct dir_struct dir;
723 int i, hit = 0;
724
725 memset(&dir, 0, sizeof(dir));
726 setup_standard_excludes(&dir);
727
728 fill_directory(&dir, paths);
729 for (i = 0; i < dir.nr; i++) {
730 hit |= grep_file(opt, dir.entries[i]->name);
731 if (hit && opt->status_only)
732 break;
733 }
734 return hit;
735 }
736
737 static int context_callback(const struct option *opt, const char *arg,
738 int unset)
739 {
740 struct grep_opt *grep_opt = opt->value;
741 int value;
742 const char *endp;
743
744 if (unset) {
745 grep_opt->pre_context = grep_opt->post_context = 0;
746 return 0;
747 }
748 value = strtol(arg, (char **)&endp, 10);
749 if (*endp) {
750 return error("switch `%c' expects a numerical value",
751 opt->short_name);
752 }
753 grep_opt->pre_context = grep_opt->post_context = value;
754 return 0;
755 }
756
757 static int file_callback(const struct option *opt, const char *arg, int unset)
758 {
759 struct grep_opt *grep_opt = opt->value;
760 FILE *patterns;
761 int lno = 0;
762 struct strbuf sb = STRBUF_INIT;
763
764 patterns = fopen(arg, "r");
765 if (!patterns)
766 die_errno("cannot open '%s'", arg);
767 while (strbuf_getline(&sb, patterns, '\n') == 0) {
768 char *s;
769 size_t len;
770
771 /* ignore empty line like grep does */
772 if (sb.len == 0)
773 continue;
774
775 s = strbuf_detach(&sb, &len);
776 append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
777 }
778 fclose(patterns);
779 strbuf_release(&sb);
780 return 0;
781 }
782
783 static int not_callback(const struct option *opt, const char *arg, int unset)
784 {
785 struct grep_opt *grep_opt = opt->value;
786 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
787 return 0;
788 }
789
790 static int and_callback(const struct option *opt, const char *arg, int unset)
791 {
792 struct grep_opt *grep_opt = opt->value;
793 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
794 return 0;
795 }
796
797 static int open_callback(const struct option *opt, const char *arg, int unset)
798 {
799 struct grep_opt *grep_opt = opt->value;
800 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
801 return 0;
802 }
803
804 static int close_callback(const struct option *opt, const char *arg, int unset)
805 {
806 struct grep_opt *grep_opt = opt->value;
807 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
808 return 0;
809 }
810
811 static int pattern_callback(const struct option *opt, const char *arg,
812 int unset)
813 {
814 struct grep_opt *grep_opt = opt->value;
815 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
816 return 0;
817 }
818
819 static int help_callback(const struct option *opt, const char *arg, int unset)
820 {
821 return -1;
822 }
823
824 int cmd_grep(int argc, const char **argv, const char *prefix)
825 {
826 int hit = 0;
827 int cached = 0;
828 int seen_dashdash = 0;
829 int external_grep_allowed__ignored;
830 const char *show_in_pager = NULL, *default_pager = "dummy";
831 struct grep_opt opt;
832 struct object_array list = OBJECT_ARRAY_INIT;
833 const char **paths = NULL;
834 struct string_list path_list = STRING_LIST_INIT_NODUP;
835 int i;
836 int dummy;
837 int use_index = 1;
838 struct option options[] = {
839 OPT_BOOLEAN(0, "cached", &cached,
840 "search in index instead of in the work tree"),
841 OPT_BOOLEAN(0, "index", &use_index,
842 "--no-index finds in contents not managed by git"),
843 OPT_GROUP(""),
844 OPT_BOOLEAN('v', "invert-match", &opt.invert,
845 "show non-matching lines"),
846 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
847 "case insensitive matching"),
848 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
849 "match patterns only at word boundaries"),
850 OPT_SET_INT('a', "text", &opt.binary,
851 "process binary files as text", GREP_BINARY_TEXT),
852 OPT_SET_INT('I', NULL, &opt.binary,
853 "don't match patterns in binary files",
854 GREP_BINARY_NOMATCH),
855 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
856 "descend at most <depth> levels", PARSE_OPT_NONEG,
857 NULL, 1 },
858 OPT_GROUP(""),
859 OPT_BIT('E', "extended-regexp", &opt.regflags,
860 "use extended POSIX regular expressions", REG_EXTENDED),
861 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
862 "use basic POSIX regular expressions (default)",
863 REG_EXTENDED),
864 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
865 "interpret patterns as fixed strings"),
866 OPT_GROUP(""),
867 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
868 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
869 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
870 OPT_NEGBIT(0, "full-name", &opt.relative,
871 "show filenames relative to top directory", 1),
872 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
873 "show only filenames instead of matching lines"),
874 OPT_BOOLEAN(0, "name-only", &opt.name_only,
875 "synonym for --files-with-matches"),
876 OPT_BOOLEAN('L', "files-without-match",
877 &opt.unmatch_name_only,
878 "show only the names of files without match"),
879 OPT_BOOLEAN('z', "null", &opt.null_following_name,
880 "print NUL after filenames"),
881 OPT_BOOLEAN('c', "count", &opt.count,
882 "show the number of matches instead of matching lines"),
883 OPT__COLOR(&opt.color, "highlight matches"),
884 OPT_GROUP(""),
885 OPT_CALLBACK('C', NULL, &opt, "n",
886 "show <n> context lines before and after matches",
887 context_callback),
888 OPT_INTEGER('B', NULL, &opt.pre_context,
889 "show <n> context lines before matches"),
890 OPT_INTEGER('A', NULL, &opt.post_context,
891 "show <n> context lines after matches"),
892 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
893 context_callback),
894 OPT_BOOLEAN('p', "show-function", &opt.funcname,
895 "show a line with the function name before matches"),
896 OPT_GROUP(""),
897 OPT_CALLBACK('f', NULL, &opt, "file",
898 "read patterns from file", file_callback),
899 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
900 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
901 { OPTION_CALLBACK, 0, "and", &opt, NULL,
902 "combine patterns specified with -e",
903 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
904 OPT_BOOLEAN(0, "or", &dummy, ""),
905 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
906 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
907 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
908 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
909 open_callback },
910 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
911 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
912 close_callback },
913 OPT__QUIET(&opt.status_only,
914 "indicate hit with exit status without output"),
915 OPT_BOOLEAN(0, "all-match", &opt.all_match,
916 "show only matches from files that match all patterns"),
917 OPT_GROUP(""),
918 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
919 "pager", "show matching files in the pager",
920 PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
921 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
922 "allow calling of grep(1) (ignored by this build)"),
923 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
924 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
925 OPT_END()
926 };
927
928 /*
929 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
930 * to show usage information and exit.
931 */
932 if (argc == 2 && !strcmp(argv[1], "-h"))
933 usage_with_options(grep_usage, options);
934
935 memset(&opt, 0, sizeof(opt));
936 opt.prefix = prefix;
937 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
938 opt.relative = 1;
939 opt.pathname = 1;
940 opt.pattern_tail = &opt.pattern_list;
941 opt.header_tail = &opt.header_list;
942 opt.regflags = REG_NEWLINE;
943 opt.max_depth = -1;
944
945 strcpy(opt.color_context, "");
946 strcpy(opt.color_filename, "");
947 strcpy(opt.color_function, "");
948 strcpy(opt.color_lineno, "");
949 strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
950 strcpy(opt.color_selected, "");
951 strcpy(opt.color_sep, GIT_COLOR_CYAN);
952 opt.color = -1;
953 git_config(grep_config, &opt);
954 if (opt.color == -1)
955 opt.color = git_use_color_default;
956
957 /*
958 * If there is no -- then the paths must exist in the working
959 * tree. If there is no explicit pattern specified with -e or
960 * -f, we take the first unrecognized non option to be the
961 * pattern, but then what follows it must be zero or more
962 * valid refs up to the -- (if exists), and then existing
963 * paths. If there is an explicit pattern, then the first
964 * unrecognized non option is the beginning of the refs list
965 * that continues up to the -- (if exists), and then paths.
966 */
967 argc = parse_options(argc, argv, prefix, options, grep_usage,
968 PARSE_OPT_KEEP_DASHDASH |
969 PARSE_OPT_STOP_AT_NON_OPTION |
970 PARSE_OPT_NO_INTERNAL_HELP);
971
972 if (use_index && !startup_info->have_repository)
973 /* die the same way as if we did it at the beginning */
974 setup_git_directory();
975
976 /*
977 * skip a -- separator; we know it cannot be
978 * separating revisions from pathnames if
979 * we haven't even had any patterns yet
980 */
981 if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
982 argv++;
983 argc--;
984 }
985
986 /* First unrecognized non-option token */
987 if (argc > 0 && !opt.pattern_list) {
988 append_grep_pattern(&opt, argv[0], "command line", 0,
989 GREP_PATTERN);
990 argv++;
991 argc--;
992 }
993
994 if (show_in_pager == default_pager)
995 show_in_pager = git_pager(1);
996 if (show_in_pager) {
997 opt.color = 0;
998 opt.name_only = 1;
999 opt.null_following_name = 1;
1000 opt.output_priv = &path_list;
1001 opt.output = append_path;
1002 string_list_append(&path_list, show_in_pager);
1003 use_threads = 0;
1004 }
1005
1006 if (!opt.pattern_list)
1007 die("no pattern given.");
1008 if (!opt.fixed && opt.ignore_case)
1009 opt.regflags |= REG_ICASE;
1010 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
1011 die("cannot mix --fixed-strings and regexp");
1012
1013 #ifndef NO_PTHREADS
1014 if (online_cpus() == 1 || !grep_threads_ok(&opt))
1015 use_threads = 0;
1016
1017 if (use_threads) {
1018 if (opt.pre_context || opt.post_context)
1019 print_hunk_marks_between_files = 1;
1020 start_threads(&opt);
1021 }
1022 #else
1023 use_threads = 0;
1024 #endif
1025
1026 compile_grep_patterns(&opt);
1027
1028 /* Check revs and then paths */
1029 for (i = 0; i < argc; i++) {
1030 const char *arg = argv[i];
1031 unsigned char sha1[20];
1032 /* Is it a rev? */
1033 if (!get_sha1(arg, sha1)) {
1034 struct object *object = parse_object(sha1);
1035 if (!object)
1036 die("bad object %s", arg);
1037 add_object_array(object, arg, &list);
1038 continue;
1039 }
1040 if (!strcmp(arg, "--")) {
1041 i++;
1042 seen_dashdash = 1;
1043 }
1044 break;
1045 }
1046
1047 /* The rest are paths */
1048 if (!seen_dashdash) {
1049 int j;
1050 for (j = i; j < argc; j++)
1051 verify_filename(prefix, argv[j]);
1052 }
1053
1054 if (i < argc)
1055 paths = get_pathspec(prefix, argv + i);
1056 else if (prefix) {
1057 paths = xcalloc(2, sizeof(const char *));
1058 paths[0] = prefix;
1059 paths[1] = NULL;
1060 }
1061
1062 if (show_in_pager && (cached || list.nr))
1063 die("--open-files-in-pager only works on the worktree");
1064
1065 if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1066 const char *pager = path_list.items[0].string;
1067 int len = strlen(pager);
1068
1069 if (len > 4 && is_dir_sep(pager[len - 5]))
1070 pager += len - 4;
1071
1072 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1073 struct strbuf buf = STRBUF_INIT;
1074 strbuf_addf(&buf, "+/%s%s",
1075 strcmp("less", pager) ? "" : "*",
1076 opt.pattern_list->pattern);
1077 string_list_append(&path_list, buf.buf);
1078 strbuf_detach(&buf, NULL);
1079 }
1080 }
1081
1082 if (!show_in_pager)
1083 setup_pager();
1084
1085
1086 if (!use_index) {
1087 if (cached)
1088 die("--cached cannot be used with --no-index.");
1089 if (list.nr)
1090 die("--no-index cannot be used with revs.");
1091 hit = grep_directory(&opt, paths);
1092 } else if (!list.nr) {
1093 if (!cached)
1094 setup_work_tree();
1095
1096 hit = grep_cache(&opt, paths, cached);
1097 } else {
1098 if (cached)
1099 die("both --cached and trees are given.");
1100 hit = grep_objects(&opt, paths, &list);
1101 }
1102
1103 if (use_threads)
1104 hit |= wait_all();
1105 if (hit && show_in_pager)
1106 run_pager(&opt, prefix);
1107 free_grep_patterns(&opt);
1108 return !hit;
1109 }