Unify code paths of threaded greps
[git/git.git] / builtin / grep.c
CommitLineData
5010cb5f
JH
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"
1362671f 11#include "tree-walk.h"
5010cb5f 12#include "builtin.h"
3e230fa1 13#include "parse-options.h"
60ecac98 14#include "userdiff.h"
83b5d2f5 15#include "grep.h"
493b7a08 16#include "quote.h"
59332d13 17#include "dir.h"
5f7c643a 18
5b594f45 19#ifndef NO_PTHREADS
5b594f45 20#include <pthread.h>
93749194 21#include "thread-utils.h"
5b594f45
FK
22#endif
23
3e230fa1
RS
24static char const * const grep_usage[] = {
25 "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
26 NULL
27};
28
5b594f45
FK
29static int use_threads = 1;
30
31#ifndef NO_PTHREADS
32#define THREADS 8
33static pthread_t threads[THREADS];
34
35static void *load_sha1(const unsigned char *sha1, unsigned long *size,
36 const char *name);
37static void *load_file(const char *filename, size_t *sz);
38
39enum work_type {WORK_SHA1, WORK_FILE};
40
41/* We use one producer thread and THREADS consumer
42 * threads. The producer adds struct work_items to 'todo' and the
43 * consumers pick work items from the same array.
44 */
45struct work_item
46{
47 enum work_type type;
48 char *name;
49
50 /* if type == WORK_SHA1, then 'identifier' is a SHA1,
51 * otherwise type == WORK_FILE, and 'identifier' is a NUL
52 * terminated filename.
53 */
54 void *identifier;
55 char done;
56 struct strbuf out;
57};
58
59/* In the range [todo_done, todo_start) in 'todo' we have work_items
60 * that have been or are processed by a consumer thread. We haven't
61 * written the result for these to stdout yet.
62 *
63 * The work_items in [todo_start, todo_end) are waiting to be picked
64 * up by a consumer thread.
65 *
66 * The ranges are modulo TODO_SIZE.
67 */
68#define TODO_SIZE 128
69static struct work_item todo[TODO_SIZE];
70static int todo_start;
71static int todo_end;
72static int todo_done;
73
74/* Has all work items been added? */
75static int all_work_added;
76
77/* This lock protects all the variables above. */
78static pthread_mutex_t grep_mutex;
79
80/* Used to serialize calls to read_sha1_file. */
81static pthread_mutex_t read_sha1_mutex;
82
83#define grep_lock() pthread_mutex_lock(&grep_mutex)
84#define grep_unlock() pthread_mutex_unlock(&grep_mutex)
85#define read_sha1_lock() pthread_mutex_lock(&read_sha1_mutex)
86#define read_sha1_unlock() pthread_mutex_unlock(&read_sha1_mutex)
87
88/* Signalled when a new work_item is added to todo. */
89static pthread_cond_t cond_add;
90
91/* Signalled when the result from one work_item is written to
92 * stdout.
93 */
94static pthread_cond_t cond_write;
95
96/* Signalled when we are finished with everything. */
97static pthread_cond_t cond_result;
98
431d6e7b
RS
99static int print_hunk_marks_between_files;
100static int printed_something;
101
5b594f45
FK
102static void add_work(enum work_type type, char *name, void *id)
103{
104 grep_lock();
105
106 while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
107 pthread_cond_wait(&cond_write, &grep_mutex);
108 }
109
110 todo[todo_end].type = type;
111 todo[todo_end].name = name;
112 todo[todo_end].identifier = id;
113 todo[todo_end].done = 0;
114 strbuf_reset(&todo[todo_end].out);
115 todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
116
117 pthread_cond_signal(&cond_add);
118 grep_unlock();
119}
120
121static struct work_item *get_work(void)
122{
123 struct work_item *ret;
124
125 grep_lock();
126 while (todo_start == todo_end && !all_work_added) {
127 pthread_cond_wait(&cond_add, &grep_mutex);
128 }
129
130 if (todo_start == todo_end && all_work_added) {
131 ret = NULL;
132 } else {
133 ret = &todo[todo_start];
134 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
135 }
136 grep_unlock();
137 return ret;
138}
139
140static void grep_sha1_async(struct grep_opt *opt, char *name,
141 const unsigned char *sha1)
142{
143 unsigned char *s;
144 s = xmalloc(20);
145 memcpy(s, sha1, 20);
146 add_work(WORK_SHA1, name, s);
147}
148
149static void grep_file_async(struct grep_opt *opt, char *name,
150 const char *filename)
151{
152 add_work(WORK_FILE, name, xstrdup(filename));
153}
154
155static void work_done(struct work_item *w)
156{
157 int old_done;
158
159 grep_lock();
160 w->done = 1;
161 old_done = todo_done;
162 for(; todo[todo_done].done && todo_done != todo_start;
163 todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
164 w = &todo[todo_done];
431d6e7b
RS
165 if (w->out.len) {
166 if (print_hunk_marks_between_files && printed_something)
167 write_or_die(1, "--\n", 3);
168 write_or_die(1, w->out.buf, w->out.len);
169 printed_something = 1;
170 }
5b594f45
FK
171 free(w->name);
172 free(w->identifier);
173 }
174
175 if (old_done != todo_done)
176 pthread_cond_signal(&cond_write);
177
178 if (all_work_added && todo_done == todo_end)
179 pthread_cond_signal(&cond_result);
180
181 grep_unlock();
182}
183
184static void *run(void *arg)
185{
186 int hit = 0;
187 struct grep_opt *opt = arg;
188
189 while (1) {
190 struct work_item *w = get_work();
191 if (!w)
192 break;
193
194 opt->output_priv = w;
195 if (w->type == WORK_SHA1) {
196 unsigned long sz;
197 void* data = load_sha1(w->identifier, &sz, w->name);
198
199 if (data) {
200 hit |= grep_buffer(opt, w->name, data, sz);
201 free(data);
202 }
203 } else if (w->type == WORK_FILE) {
204 size_t sz;
205 void* data = load_file(w->identifier, &sz);
206 if (data) {
207 hit |= grep_buffer(opt, w->name, data, sz);
208 free(data);
209 }
210 } else {
211 assert(0);
212 }
213
214 work_done(w);
215 }
bfac23d9
DM
216 free_grep_patterns(arg);
217 free(arg);
5b594f45
FK
218
219 return (void*) (intptr_t) hit;
220}
221
222static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
223{
224 struct work_item *w = opt->output_priv;
225 strbuf_add(&w->out, buf, size);
226}
227
228static void start_threads(struct grep_opt *opt)
229{
230 int i;
231
232 pthread_mutex_init(&grep_mutex, NULL);
233 pthread_mutex_init(&read_sha1_mutex, NULL);
234 pthread_cond_init(&cond_add, NULL);
235 pthread_cond_init(&cond_write, NULL);
236 pthread_cond_init(&cond_result, NULL);
237
238 for (i = 0; i < ARRAY_SIZE(todo); i++) {
239 strbuf_init(&todo[i].out, 0);
240 }
241
242 for (i = 0; i < ARRAY_SIZE(threads); i++) {
243 int err;
244 struct grep_opt *o = grep_opt_dup(opt);
245 o->output = strbuf_out;
246 compile_grep_patterns(o);
247 err = pthread_create(&threads[i], NULL, run, o);
248
249 if (err)
250 die("grep: failed to create thread: %s",
251 strerror(err));
252 }
253}
254
255static int wait_all(void)
256{
257 int hit = 0;
258 int i;
259
260 grep_lock();
261 all_work_added = 1;
262
263 /* Wait until all work is done. */
264 while (todo_done != todo_end)
265 pthread_cond_wait(&cond_result, &grep_mutex);
266
267 /* Wake up all the consumer threads so they can see that there
268 * is no more work to do.
269 */
270 pthread_cond_broadcast(&cond_add);
271 grep_unlock();
272
273 for (i = 0; i < ARRAY_SIZE(threads); i++) {
274 void *h;
275 pthread_join(threads[i], &h);
276 hit |= (int) (intptr_t) h;
277 }
278
279 pthread_mutex_destroy(&grep_mutex);
280 pthread_mutex_destroy(&read_sha1_mutex);
281 pthread_cond_destroy(&cond_add);
282 pthread_cond_destroy(&cond_write);
283 pthread_cond_destroy(&cond_result);
284
285 return hit;
286}
287#else /* !NO_PTHREADS */
288#define read_sha1_lock()
289#define read_sha1_unlock()
290
291static int wait_all(void)
292{
293 return 0;
294}
295#endif
296
7e8f59d5
RS
297static int grep_config(const char *var, const char *value, void *cb)
298{
299 struct grep_opt *opt = cb;
55f638bd 300 char *color = NULL;
7e8f59d5 301
60ecac98
RS
302 switch (userdiff_config(var, value)) {
303 case 0: break;
304 case -1: return -1;
305 default: return 0;
306 }
307
55f638bd 308 if (!strcmp(var, "color.grep"))
7e8f59d5 309 opt->color = git_config_colorbool(var, value, -1);
00588bb5
ML
310 else if (!strcmp(var, "color.grep.context"))
311 color = opt->color_context;
55f638bd
ML
312 else if (!strcmp(var, "color.grep.filename"))
313 color = opt->color_filename;
00588bb5
ML
314 else if (!strcmp(var, "color.grep.function"))
315 color = opt->color_function;
55f638bd
ML
316 else if (!strcmp(var, "color.grep.linenumber"))
317 color = opt->color_lineno;
318 else if (!strcmp(var, "color.grep.match"))
319 color = opt->color_match;
00588bb5
ML
320 else if (!strcmp(var, "color.grep.selected"))
321 color = opt->color_selected;
55f638bd
ML
322 else if (!strcmp(var, "color.grep.separator"))
323 color = opt->color_sep;
324 else
325 return git_color_default_config(var, value, cb);
326 if (color) {
7e8f59d5
RS
327 if (!value)
328 return config_error_nonbool(var);
55f638bd 329 color_parse(value, var, color);
7e8f59d5 330 }
55f638bd 331 return 0;
7e8f59d5
RS
332}
333
a91f453f
MK
334/*
335 * Return non-zero if max_depth is negative or path has no more then max_depth
336 * slashes.
337 */
338static int accept_subdir(const char *path, int max_depth)
339{
340 if (max_depth < 0)
341 return 1;
342
343 while ((path = strchr(path, '/')) != NULL) {
344 max_depth--;
345 if (max_depth < 0)
346 return 0;
347 path++;
348 }
349 return 1;
350}
351
352/*
353 * Return non-zero if name is a subdirectory of match and is not too deep.
354 */
355static int is_subdir(const char *name, int namelen,
356 const char *match, int matchlen, int max_depth)
357{
358 if (matchlen > namelen || strncmp(name, match, matchlen))
359 return 0;
360
361 if (name[matchlen] == '\0') /* exact match */
362 return 1;
363
364 if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
365 return accept_subdir(name + matchlen + 1, max_depth);
366
367 return 0;
368}
369
e0eb889f
JH
370/*
371 * git grep pathspecs are somewhat different from diff-tree pathspecs;
372 * pathname wildcards are allowed.
373 */
a91f453f 374static int pathspec_matches(const char **paths, const char *name, int max_depth)
5010cb5f 375{
e0eb889f 376 int namelen, i;
1362671f 377 if (!paths || !*paths)
a91f453f 378 return accept_subdir(name, max_depth);
5010cb5f 379 namelen = strlen(name);
1362671f
JH
380 for (i = 0; paths[i]; i++) {
381 const char *match = paths[i];
382 int matchlen = strlen(match);
1e3d90e0 383 const char *cp, *meta;
e0eb889f 384
a91f453f 385 if (is_subdir(name, namelen, match, matchlen, max_depth))
e0eb889f
JH
386 return 1;
387 if (!fnmatch(match, name, 0))
388 return 1;
389 if (name[namelen-1] != '/')
5010cb5f 390 continue;
e0eb889f 391
1e3d90e0 392 /* We are being asked if the directory ("name") is worth
e0eb889f
JH
393 * descending into.
394 *
395 * Find the longest leading directory name that does
396 * not have metacharacter in the pathspec; the name
397 * we are looking at must overlap with that directory.
5010cb5f 398 */
1e3d90e0 399 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
e0eb889f 400 char ch = *cp;
1e3d90e0
JH
401 if (ch == '*' || ch == '[' || ch == '?') {
402 meta = cp;
5010cb5f 403 break;
1e3d90e0 404 }
e0eb889f 405 }
1e3d90e0
JH
406 if (!meta)
407 meta = cp; /* fully literal */
408
409 if (namelen <= meta - match) {
e0eb889f
JH
410 /* Looking at "Documentation/" and
411 * the pattern says "Documentation/howto/", or
1e3d90e0
JH
412 * "Documentation/diff*.txt". The name we
413 * have should match prefix.
e0eb889f
JH
414 */
415 if (!memcmp(match, name, namelen))
416 return 1;
1e3d90e0 417 continue;
e0eb889f 418 }
1e3d90e0
JH
419
420 if (meta - match < namelen) {
e0eb889f 421 /* Looking at "Documentation/howto/" and
1e3d90e0
JH
422 * the pattern says "Documentation/h*";
423 * match up to "Do.../h"; this avoids descending
424 * into "Documentation/technical/".
e0eb889f 425 */
1e3d90e0 426 if (!memcmp(match, name, meta - match))
e0eb889f 427 return 1;
1e3d90e0 428 continue;
e0eb889f 429 }
5010cb5f
JH
430 }
431 return 0;
432}
433
5f02d315
JH
434static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
435{
436 void *data;
437
438 if (use_threads) {
439 read_sha1_lock();
440 data = read_sha1_file(sha1, type, size);
441 read_sha1_unlock();
442 } else {
443 data = read_sha1_file(sha1, type, size);
444 }
445 return data;
446}
447
5b594f45
FK
448static void *load_sha1(const unsigned char *sha1, unsigned long *size,
449 const char *name)
5010cb5f 450{
21666f1a 451 enum object_type type;
5f02d315 452 void *data = lock_and_read_sha1_file(sha1, &type, size);
5b594f45
FK
453
454 if (!data)
5010cb5f 455 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
5b594f45
FK
456
457 return data;
458}
459
460static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
461 const char *filename, int tree_name_len)
462{
463 struct strbuf pathbuf = STRBUF_INIT;
464 char *name;
465
0d042fec 466 if (opt->relative && opt->prefix_length) {
5b594f45
FK
467 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
468 opt->prefix);
469 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
470 } else {
471 strbuf_addstr(&pathbuf, filename);
472 }
473
474 name = strbuf_detach(&pathbuf, NULL);
475
476#ifndef NO_PTHREADS
477 if (use_threads) {
478 grep_sha1_async(opt, name, sha1);
479 return 0;
480 } else
481#endif
482 {
483 int hit;
484 unsigned long sz;
485 void *data = load_sha1(sha1, &sz, name);
486 if (!data)
487 hit = 0;
488 else
489 hit = grep_buffer(opt, name, data, sz);
490
491 free(data);
492 free(name);
493 return hit;
0d042fec 494 }
5010cb5f
JH
495}
496
5b594f45 497static void *load_file(const char *filename, size_t *sz)
5010cb5f
JH
498{
499 struct stat st;
5010cb5f 500 char *data;
5b594f45 501 int i;
dc49cd76 502
5010cb5f
JH
503 if (lstat(filename, &st) < 0) {
504 err_ret:
505 if (errno != ENOENT)
506 error("'%s': %s", filename, strerror(errno));
507 return 0;
508 }
5010cb5f
JH
509 if (!S_ISREG(st.st_mode))
510 return 0;
5b594f45 511 *sz = xsize_t(st.st_size);
5010cb5f
JH
512 i = open(filename, O_RDONLY);
513 if (i < 0)
514 goto err_ret;
5b594f45
FK
515 data = xmalloc(*sz + 1);
516 if (st.st_size != read_in_full(i, data, *sz)) {
5010cb5f
JH
517 error("'%s': short read %s", filename, strerror(errno));
518 close(i);
519 free(data);
520 return 0;
521 }
522 close(i);
5b594f45
FK
523 data[*sz] = 0;
524 return data;
525}
526
527static int grep_file(struct grep_opt *opt, const char *filename)
528{
529 struct strbuf buf = STRBUF_INIT;
530 char *name;
531
0d042fec 532 if (opt->relative && opt->prefix_length)
5b594f45
FK
533 quote_path_relative(filename, -1, &buf, opt->prefix);
534 else
535 strbuf_addstr(&buf, filename);
536 name = strbuf_detach(&buf, NULL);
537
538#ifndef NO_PTHREADS
539 if (use_threads) {
540 grep_file_async(opt, name, filename);
541 return 0;
542 } else
543#endif
544 {
545 int hit;
546 size_t sz;
547 void *data = load_file(filename, &sz);
548 if (!data)
549 hit = 0;
550 else
551 hit = grep_buffer(opt, name, data, sz);
552
553 free(data);
554 free(name);
555 return hit;
556 }
5010cb5f
JH
557}
558
bbc09c22 559static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
5010cb5f
JH
560{
561 int hit = 0;
562 int nr;
563 read_cache();
564
565 for (nr = 0; nr < active_nr; nr++) {
566 struct cache_entry *ce = active_cache[nr];
7a51ed66 567 if (!S_ISREG(ce->ce_mode))
5010cb5f 568 continue;
a91f453f 569 if (!pathspec_matches(paths, ce->name, opt->max_depth))
5010cb5f 570 continue;
57d43466
NTND
571 /*
572 * If CE_VALID is on, we assume worktree file and its cache entry
573 * are identical, even if worktree file has been modified, so use
574 * cache version instead
575 */
b4d1690d 576 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
36f2587f
JH
577 if (ce_stage(ce))
578 continue;
0d042fec 579 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
36f2587f 580 }
5010cb5f
JH
581 else
582 hit |= grep_file(opt, ce->name);
36f2587f
JH
583 if (ce_stage(ce)) {
584 do {
585 nr++;
586 } while (nr < active_nr &&
587 !strcmp(ce->name, active_cache[nr]->name));
588 nr--; /* compensate for loop control */
589 }
c8610a2e
JH
590 if (hit && opt->status_only)
591 break;
5010cb5f
JH
592 }
593 return hit;
594}
595
1362671f 596static int grep_tree(struct grep_opt *opt, const char **paths,
5010cb5f
JH
597 struct tree_desc *tree,
598 const char *tree_name, const char *base)
599{
5010cb5f
JH
600 int len;
601 int hit = 0;
4c068a98 602 struct name_entry entry;
e0eb889f 603 char *down;
0d042fec 604 int tn_len = strlen(tree_name);
620e2bb9
DP
605 struct strbuf pathbuf;
606
607 strbuf_init(&pathbuf, PATH_MAX + tn_len);
5010cb5f 608
0d042fec 609 if (tn_len) {
620e2bb9
DP
610 strbuf_add(&pathbuf, tree_name, tn_len);
611 strbuf_addch(&pathbuf, ':');
612 tn_len = pathbuf.len;
5010cb5f 613 }
620e2bb9
DP
614 strbuf_addstr(&pathbuf, base);
615 len = pathbuf.len;
5010cb5f 616
4c068a98 617 while (tree_entry(tree, &entry)) {
620e2bb9
DP
618 int te_len = tree_entry_len(entry.path, entry.sha1);
619 pathbuf.len = len;
620 strbuf_add(&pathbuf, entry.path, te_len);
5010cb5f 621
4c068a98 622 if (S_ISDIR(entry.mode))
e0eb889f
JH
623 /* Match "abc/" against pathspec to
624 * decide if we want to descend into "abc"
625 * directory.
626 */
620e2bb9 627 strbuf_addch(&pathbuf, '/');
e0eb889f 628
620e2bb9 629 down = pathbuf.buf + tn_len;
a91f453f 630 if (!pathspec_matches(paths, down, opt->max_depth))
5010cb5f 631 ;
4c068a98 632 else if (S_ISREG(entry.mode))
620e2bb9 633 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
4c068a98 634 else if (S_ISDIR(entry.mode)) {
21666f1a 635 enum object_type type;
5010cb5f
JH
636 struct tree_desc sub;
637 void *data;
6fda5e51
LT
638 unsigned long size;
639
5f02d315 640 data = lock_and_read_sha1_file(entry.sha1, &type, &size);
5010cb5f
JH
641 if (!data)
642 die("unable to read tree (%s)",
4c068a98 643 sha1_to_hex(entry.sha1));
6fda5e51 644 init_tree_desc(&sub, data, size);
1362671f 645 hit |= grep_tree(opt, paths, &sub, tree_name, down);
5010cb5f
JH
646 free(data);
647 }
c8610a2e
JH
648 if (hit && opt->status_only)
649 break;
5010cb5f 650 }
620e2bb9 651 strbuf_release(&pathbuf);
5010cb5f
JH
652 return hit;
653}
654
1362671f 655static int grep_object(struct grep_opt *opt, const char **paths,
5010cb5f
JH
656 struct object *obj, const char *name)
657{
1974632c 658 if (obj->type == OBJ_BLOB)
0d042fec 659 return grep_sha1(opt, obj->sha1, name, 0);
1974632c 660 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
5010cb5f
JH
661 struct tree_desc tree;
662 void *data;
6fda5e51 663 unsigned long size;
5010cb5f
JH
664 int hit;
665 data = read_object_with_reference(obj->sha1, tree_type,
6fda5e51 666 &size, NULL);
5010cb5f
JH
667 if (!data)
668 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
6fda5e51 669 init_tree_desc(&tree, data, size);
1362671f 670 hit = grep_tree(opt, paths, &tree, name, "");
5010cb5f
JH
671 free(data);
672 return hit;
673 }
885a86ab 674 die("unable to grep from object of type %s", typename(obj->type));
5010cb5f
JH
675}
676
30d00c39
JN
677static int grep_objects(struct grep_opt *opt, const char **paths,
678 const struct object_array *list)
679{
680 unsigned int i;
681 int hit = 0;
682 const unsigned int nr = list->nr;
683
684 for (i = 0; i < nr; i++) {
685 struct object *real_obj;
686 real_obj = deref_tag(list->objects[i].item, NULL, 0);
687 if (grep_object(opt, paths, real_obj, list->objects[i].name)) {
688 hit = 1;
689 if (opt->status_only)
690 break;
691 }
692 }
693 return hit;
694}
695
59332d13
JH
696static int grep_directory(struct grep_opt *opt, const char **paths)
697{
698 struct dir_struct dir;
699 int i, hit = 0;
700
701 memset(&dir, 0, sizeof(dir));
702 setup_standard_excludes(&dir);
703
704 fill_directory(&dir, paths);
705 for (i = 0; i < dir.nr; i++) {
706 hit |= grep_file(opt, dir.entries[i]->name);
707 if (hit && opt->status_only)
708 break;
709 }
59332d13
JH
710 return hit;
711}
712
ff3c7f9a
RS
713static int context_callback(const struct option *opt, const char *arg,
714 int unset)
3e230fa1
RS
715{
716 struct grep_opt *grep_opt = opt->value;
717 int value;
718 const char *endp;
719
720 if (unset) {
721 grep_opt->pre_context = grep_opt->post_context = 0;
722 return 0;
723 }
724 value = strtol(arg, (char **)&endp, 10);
725 if (*endp) {
726 return error("switch `%c' expects a numerical value",
727 opt->short_name);
728 }
729 grep_opt->pre_context = grep_opt->post_context = value;
730 return 0;
731}
732
ff3c7f9a 733static int file_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
734{
735 struct grep_opt *grep_opt = opt->value;
736 FILE *patterns;
737 int lno = 0;
cfe370c6 738 struct strbuf sb = STRBUF_INIT;
3e230fa1
RS
739
740 patterns = fopen(arg, "r");
741 if (!patterns)
d824cbba 742 die_errno("cannot open '%s'", arg);
3e230fa1
RS
743 while (strbuf_getline(&sb, patterns, '\n') == 0) {
744 /* ignore empty line like grep does */
745 if (sb.len == 0)
746 continue;
747 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
748 ++lno, GREP_PATTERN);
749 }
750 fclose(patterns);
751 strbuf_release(&sb);
752 return 0;
753}
754
ff3c7f9a 755static int not_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
756{
757 struct grep_opt *grep_opt = opt->value;
758 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
759 return 0;
760}
761
ff3c7f9a 762static int and_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
763{
764 struct grep_opt *grep_opt = opt->value;
765 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
766 return 0;
767}
768
ff3c7f9a 769static int open_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
770{
771 struct grep_opt *grep_opt = opt->value;
772 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
773 return 0;
774}
775
ff3c7f9a 776static int close_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
777{
778 struct grep_opt *grep_opt = opt->value;
779 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
780 return 0;
781}
782
ff3c7f9a
RS
783static int pattern_callback(const struct option *opt, const char *arg,
784 int unset)
3e230fa1
RS
785{
786 struct grep_opt *grep_opt = opt->value;
787 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
788 return 0;
789}
5010cb5f 790
ff3c7f9a 791static int help_callback(const struct option *opt, const char *arg, int unset)
3e230fa1
RS
792{
793 return -1;
794}
088b084b 795
a633fca0 796int cmd_grep(int argc, const char **argv, const char *prefix)
5010cb5f 797{
5010cb5f 798 int hit = 0;
5010cb5f 799 int cached = 0;
5acd64ed 800 int seen_dashdash = 0;
bbc09c22 801 int external_grep_allowed__ignored;
5010cb5f 802 struct grep_opt opt;
1f1e895f 803 struct object_array list = { 0, 0, NULL };
1362671f 804 const char **paths = NULL;
5acd64ed 805 int i;
3e230fa1 806 int dummy;
59332d13 807 int nongit = 0, use_index = 1;
3e230fa1
RS
808 struct option options[] = {
809 OPT_BOOLEAN(0, "cached", &cached,
810 "search in index instead of in the work tree"),
59332d13
JH
811 OPT_BOOLEAN(0, "index", &use_index,
812 "--no-index finds in contents not managed by git"),
3e230fa1
RS
813 OPT_GROUP(""),
814 OPT_BOOLEAN('v', "invert-match", &opt.invert,
815 "show non-matching lines"),
5183bf67
BC
816 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
817 "case insensitive matching"),
3e230fa1
RS
818 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
819 "match patterns only at word boundaries"),
820 OPT_SET_INT('a', "text", &opt.binary,
821 "process binary files as text", GREP_BINARY_TEXT),
822 OPT_SET_INT('I', NULL, &opt.binary,
823 "don't match patterns in binary files",
824 GREP_BINARY_NOMATCH),
a91f453f
MK
825 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
826 "descend at most <depth> levels", PARSE_OPT_NONEG,
827 NULL, 1 },
3e230fa1
RS
828 OPT_GROUP(""),
829 OPT_BIT('E', "extended-regexp", &opt.regflags,
830 "use extended POSIX regular expressions", REG_EXTENDED),
831 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
832 "use basic POSIX regular expressions (default)",
833 REG_EXTENDED),
834 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
835 "interpret patterns as fixed strings"),
836 OPT_GROUP(""),
837 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
838 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
839 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
840 OPT_NEGBIT(0, "full-name", &opt.relative,
841 "show filenames relative to top directory", 1),
842 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
843 "show only filenames instead of matching lines"),
844 OPT_BOOLEAN(0, "name-only", &opt.name_only,
845 "synonym for --files-with-matches"),
846 OPT_BOOLEAN('L', "files-without-match",
847 &opt.unmatch_name_only,
848 "show only the names of files without match"),
849 OPT_BOOLEAN('z', "null", &opt.null_following_name,
850 "print NUL after filenames"),
851 OPT_BOOLEAN('c', "count", &opt.count,
852 "show the number of matches instead of matching lines"),
73e9da01 853 OPT__COLOR(&opt.color, "highlight matches"),
3e230fa1
RS
854 OPT_GROUP(""),
855 OPT_CALLBACK('C', NULL, &opt, "n",
856 "show <n> context lines before and after matches",
857 context_callback),
858 OPT_INTEGER('B', NULL, &opt.pre_context,
859 "show <n> context lines before matches"),
860 OPT_INTEGER('A', NULL, &opt.post_context,
861 "show <n> context lines after matches"),
862 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
863 context_callback),
2944e4e6
RS
864 OPT_BOOLEAN('p', "show-function", &opt.funcname,
865 "show a line with the function name before matches"),
3e230fa1
RS
866 OPT_GROUP(""),
867 OPT_CALLBACK('f', NULL, &opt, "file",
868 "read patterns from file", file_callback),
869 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
870 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
871 { OPTION_CALLBACK, 0, "and", &opt, NULL,
872 "combine patterns specified with -e",
873 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
874 OPT_BOOLEAN(0, "or", &dummy, ""),
875 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
876 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
877 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
878 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
879 open_callback },
880 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
881 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
882 close_callback },
4ff61c21 883 OPT_BOOLEAN('q', "quiet", &opt.status_only,
c8610a2e 884 "indicate hit with exit status without output"),
3e230fa1
RS
885 OPT_BOOLEAN(0, "all-match", &opt.all_match,
886 "show only matches from files that match all patterns"),
887 OPT_GROUP(""),
bbc09c22
JH
888 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
889 "allow calling of grep(1) (ignored by this build)"),
3e230fa1
RS
890 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
891 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
892 OPT_END()
893 };
5010cb5f 894
59332d13
JH
895 prefix = setup_git_directory_gently(&nongit);
896
9c855c31
JN
897 /*
898 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
899 * to show usage information and exit.
900 */
901 if (argc == 2 && !strcmp(argv[1], "-h"))
902 usage_with_options(grep_usage, options);
903
5010cb5f 904 memset(&opt, 0, sizeof(opt));
493b7a08 905 opt.prefix = prefix;
0d042fec
JH
906 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
907 opt.relative = 1;
7977f0ea 908 opt.pathname = 1;
f9b9faf6 909 opt.pattern_tail = &opt.pattern_list;
80235ba7 910 opt.header_tail = &opt.header_list;
5010cb5f 911 opt.regflags = REG_NEWLINE;
a91f453f 912 opt.max_depth = -1;
5010cb5f 913
00588bb5 914 strcpy(opt.color_context, "");
55f638bd 915 strcpy(opt.color_filename, "");
00588bb5 916 strcpy(opt.color_function, "");
55f638bd 917 strcpy(opt.color_lineno, "");
758df17a 918 strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
00588bb5 919 strcpy(opt.color_selected, "");
55f638bd 920 strcpy(opt.color_sep, GIT_COLOR_CYAN);
7e8f59d5
RS
921 opt.color = -1;
922 git_config(grep_config, &opt);
923 if (opt.color == -1)
924 opt.color = git_use_color_default;
925
5010cb5f 926 /*
5acd64ed
JH
927 * If there is no -- then the paths must exist in the working
928 * tree. If there is no explicit pattern specified with -e or
929 * -f, we take the first unrecognized non option to be the
930 * pattern, but then what follows it must be zero or more
931 * valid refs up to the -- (if exists), and then existing
932 * paths. If there is an explicit pattern, then the first
82e5a82f 933 * unrecognized non option is the beginning of the refs list
5acd64ed 934 * that continues up to the -- (if exists), and then paths.
5010cb5f 935 */
37782920 936 argc = parse_options(argc, argv, prefix, options, grep_usage,
3e230fa1
RS
937 PARSE_OPT_KEEP_DASHDASH |
938 PARSE_OPT_STOP_AT_NON_OPTION |
939 PARSE_OPT_NO_INTERNAL_HELP);
940
59332d13
JH
941 if (use_index && nongit)
942 /* die the same way as if we did it at the beginning */
943 setup_git_directory();
944
1123c67c
JK
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
3e230fa1
RS
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--;
5010cb5f 961 }
5acd64ed 962
f9b9faf6 963 if (!opt.pattern_list)
5010cb5f 964 die("no pattern given.");
5183bf67
BC
965 if (!opt.fixed && opt.ignore_case)
966 opt.regflags |= REG_ICASE;
07ea91d8
JH
967 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
968 die("cannot mix --fixed-strings and regexp");
5b594f45
FK
969
970#ifndef NO_PTHREADS
971 if (online_cpus() == 1 || !grep_threads_ok(&opt))
972 use_threads = 0;
973
431d6e7b
RS
974 if (use_threads) {
975 if (opt.pre_context || opt.post_context)
976 print_hunk_marks_between_files = 1;
5b594f45 977 start_threads(&opt);
431d6e7b 978 }
5b594f45
FK
979#else
980 use_threads = 0;
981#endif
982
83b5d2f5 983 compile_grep_patterns(&opt);
5acd64ed
JH
984
985 /* Check revs and then paths */
3e230fa1 986 for (i = 0; i < argc; i++) {
5acd64ed 987 const char *arg = argv[i];
1362671f 988 unsigned char sha1[20];
5acd64ed
JH
989 /* Is it a rev? */
990 if (!get_sha1(arg, sha1)) {
991 struct object *object = parse_object(sha1);
5acd64ed
JH
992 if (!object)
993 die("bad object %s", arg);
1f1e895f 994 add_object_array(object, arg, &list);
5acd64ed
JH
995 continue;
996 }
997 if (!strcmp(arg, "--")) {
998 i++;
999 seen_dashdash = 1;
1000 }
1001 break;
1362671f 1002 }
5acd64ed
JH
1003
1004 /* The rest are paths */
1005 if (!seen_dashdash) {
1006 int j;
c39c4f47 1007 for (j = i; j < argc; j++)
5acd64ed
JH
1008 verify_filename(prefix, argv[j]);
1009 }
1010
493b7a08 1011 if (i < argc)
5acd64ed 1012 paths = get_pathspec(prefix, argv + i);
1362671f
JH
1013 else if (prefix) {
1014 paths = xcalloc(2, sizeof(const char *));
1015 paths[0] = prefix;
1016 paths[1] = NULL;
1017 }
5010cb5f 1018
59332d13 1019 if (!use_index) {
59332d13
JH
1020 if (cached)
1021 die("--cached cannot be used with --no-index.");
1022 if (list.nr)
1023 die("--no-index cannot be used with revs.");
1024 hit = grep_directory(&opt, paths);
685359cf 1025 } else if (!list.nr) {
6577f542
NTND
1026 if (!cached)
1027 setup_work_tree();
5b594f45
FK
1028
1029 hit = grep_cache(&opt, paths, cached);
685359cf
JS
1030 } else {
1031 if (cached)
1032 die("both --cached and trees are given.");
1033 hit = grep_objects(&opt, paths, &list);
6577f542 1034 }
aa8c79ad 1035
5b594f45
FK
1036 if (use_threads)
1037 hit |= wait_all();
b48fb5b6 1038 free_grep_patterns(&opt);
5010cb5f
JH
1039 return !hit;
1040}