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 "userdiff.h"
15 #include "grep.h"
16 #include "quote.h"
18 #ifndef NO_PTHREADS
19 #include <pthread.h>
20 #include "thread-utils.h"
21 #endif
23 static char const * const grep_usage[] = {
24 "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
25 NULL
26 };
28 static int use_threads = 1;
30 #ifndef NO_PTHREADS
31 #define THREADS 8
32 static pthread_t threads[THREADS];
34 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
35 const char *name);
36 static void *load_file(const char *filename, size_t *sz);
38 enum work_type {WORK_SHA1, WORK_FILE};
40 /* We use one producer thread and THREADS consumer
41 * threads. The producer adds struct work_items to 'todo' and the
42 * consumers pick work items from the same array.
43 */
44 struct work_item
45 {
46 enum work_type type;
47 char *name;
49 /* if type == WORK_SHA1, then 'identifier' is a SHA1,
50 * otherwise type == WORK_FILE, and 'identifier' is a NUL
51 * terminated filename.
52 */
53 void *identifier;
54 char done;
55 struct strbuf out;
56 };
58 /* In the range [todo_done, todo_start) in 'todo' we have work_items
59 * that have been or are processed by a consumer thread. We haven't
60 * written the result for these to stdout yet.
61 *
62 * The work_items in [todo_start, todo_end) are waiting to be picked
63 * up by a consumer thread.
64 *
65 * The ranges are modulo TODO_SIZE.
66 */
67 #define TODO_SIZE 128
68 static struct work_item todo[TODO_SIZE];
69 static int todo_start;
70 static int todo_end;
71 static int todo_done;
73 /* Has all work items been added? */
74 static int all_work_added;
76 /* This lock protects all the variables above. */
77 static pthread_mutex_t grep_mutex;
79 /* Used to serialize calls to read_sha1_file. */
80 static pthread_mutex_t read_sha1_mutex;
82 #define grep_lock() pthread_mutex_lock(&grep_mutex)
83 #define grep_unlock() pthread_mutex_unlock(&grep_mutex)
84 #define read_sha1_lock() pthread_mutex_lock(&read_sha1_mutex)
85 #define read_sha1_unlock() pthread_mutex_unlock(&read_sha1_mutex)
87 /* Signalled when a new work_item is added to todo. */
88 static pthread_cond_t cond_add;
90 /* Signalled when the result from one work_item is written to
91 * stdout.
92 */
93 static pthread_cond_t cond_write;
95 /* Signalled when we are finished with everything. */
96 static pthread_cond_t cond_result;
98 static void add_work(enum work_type type, char *name, void *id)
99 {
100 grep_lock();
102 while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
103 pthread_cond_wait(&cond_write, &grep_mutex);
104 }
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);
113 pthread_cond_signal(&cond_add);
114 grep_unlock();
115 }
117 static struct work_item *get_work(void)
118 {
119 struct work_item *ret;
121 grep_lock();
122 while (todo_start == todo_end && !all_work_added) {
123 pthread_cond_wait(&cond_add, &grep_mutex);
124 }
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 }
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 }
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 }
151 static void work_done(struct work_item *w)
152 {
153 int old_done;
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 write_or_die(1, w->out.buf, w->out.len);
162 free(w->name);
163 free(w->identifier);
164 }
166 if (old_done != todo_done)
167 pthread_cond_signal(&cond_write);
169 if (all_work_added && todo_done == todo_end)
170 pthread_cond_signal(&cond_result);
172 grep_unlock();
173 }
175 static void *run(void *arg)
176 {
177 int hit = 0;
178 struct grep_opt *opt = arg;
180 while (1) {
181 struct work_item *w = get_work();
182 if (!w)
183 break;
185 opt->output_priv = w;
186 if (w->type == WORK_SHA1) {
187 unsigned long sz;
188 void* data = load_sha1(w->identifier, &sz, w->name);
190 if (data) {
191 hit |= grep_buffer(opt, w->name, data, sz);
192 free(data);
193 }
194 } else if (w->type == WORK_FILE) {
195 size_t sz;
196 void* data = load_file(w->identifier, &sz);
197 if (data) {
198 hit |= grep_buffer(opt, w->name, data, sz);
199 free(data);
200 }
201 } else {
202 assert(0);
203 }
205 work_done(w);
206 }
207 free_grep_patterns(arg);
208 free(arg);
210 return (void*) (intptr_t) hit;
211 }
213 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
214 {
215 struct work_item *w = opt->output_priv;
216 strbuf_add(&w->out, buf, size);
217 }
219 static void start_threads(struct grep_opt *opt)
220 {
221 int i;
223 pthread_mutex_init(&grep_mutex, NULL);
224 pthread_mutex_init(&read_sha1_mutex, NULL);
225 pthread_cond_init(&cond_add, NULL);
226 pthread_cond_init(&cond_write, NULL);
227 pthread_cond_init(&cond_result, NULL);
229 for (i = 0; i < ARRAY_SIZE(todo); i++) {
230 strbuf_init(&todo[i].out, 0);
231 }
233 for (i = 0; i < ARRAY_SIZE(threads); i++) {
234 int err;
235 struct grep_opt *o = grep_opt_dup(opt);
236 o->output = strbuf_out;
237 compile_grep_patterns(o);
238 err = pthread_create(&threads[i], NULL, run, o);
240 if (err)
241 die("grep: failed to create thread: %s",
242 strerror(err));
243 }
244 }
246 static int wait_all(void)
247 {
248 int hit = 0;
249 int i;
251 grep_lock();
252 all_work_added = 1;
254 /* Wait until all work is done. */
255 while (todo_done != todo_end)
256 pthread_cond_wait(&cond_result, &grep_mutex);
258 /* Wake up all the consumer threads so they can see that there
259 * is no more work to do.
260 */
261 pthread_cond_broadcast(&cond_add);
262 grep_unlock();
264 for (i = 0; i < ARRAY_SIZE(threads); i++) {
265 void *h;
266 pthread_join(threads[i], &h);
267 hit |= (int) (intptr_t) h;
268 }
270 pthread_mutex_destroy(&grep_mutex);
271 pthread_mutex_destroy(&read_sha1_mutex);
272 pthread_cond_destroy(&cond_add);
273 pthread_cond_destroy(&cond_write);
274 pthread_cond_destroy(&cond_result);
276 return hit;
277 }
278 #else /* !NO_PTHREADS */
279 #define read_sha1_lock()
280 #define read_sha1_unlock()
282 static int wait_all(void)
283 {
284 return 0;
285 }
286 #endif
288 static int grep_config(const char *var, const char *value, void *cb)
289 {
290 struct grep_opt *opt = cb;
292 switch (userdiff_config(var, value)) {
293 case 0: break;
294 case -1: return -1;
295 default: return 0;
296 }
298 if (!strcmp(var, "color.grep")) {
299 opt->color = git_config_colorbool(var, value, -1);
300 return 0;
301 }
302 if (!strcmp(var, "color.grep.match")) {
303 if (!value)
304 return config_error_nonbool(var);
305 color_parse(value, var, opt->color_match);
306 return 0;
307 }
308 return git_color_default_config(var, value, cb);
309 }
311 /*
312 * Return non-zero if max_depth is negative or path has no more then max_depth
313 * slashes.
314 */
315 static int accept_subdir(const char *path, int max_depth)
316 {
317 if (max_depth < 0)
318 return 1;
320 while ((path = strchr(path, '/')) != NULL) {
321 max_depth--;
322 if (max_depth < 0)
323 return 0;
324 path++;
325 }
326 return 1;
327 }
329 /*
330 * Return non-zero if name is a subdirectory of match and is not too deep.
331 */
332 static int is_subdir(const char *name, int namelen,
333 const char *match, int matchlen, int max_depth)
334 {
335 if (matchlen > namelen || strncmp(name, match, matchlen))
336 return 0;
338 if (name[matchlen] == '\0') /* exact match */
339 return 1;
341 if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
342 return accept_subdir(name + matchlen + 1, max_depth);
344 return 0;
345 }
347 /*
348 * git grep pathspecs are somewhat different from diff-tree pathspecs;
349 * pathname wildcards are allowed.
350 */
351 static int pathspec_matches(const char **paths, const char *name, int max_depth)
352 {
353 int namelen, i;
354 if (!paths || !*paths)
355 return accept_subdir(name, max_depth);
356 namelen = strlen(name);
357 for (i = 0; paths[i]; i++) {
358 const char *match = paths[i];
359 int matchlen = strlen(match);
360 const char *cp, *meta;
362 if (is_subdir(name, namelen, match, matchlen, max_depth))
363 return 1;
364 if (!fnmatch(match, name, 0))
365 return 1;
366 if (name[namelen-1] != '/')
367 continue;
369 /* We are being asked if the directory ("name") is worth
370 * descending into.
371 *
372 * Find the longest leading directory name that does
373 * not have metacharacter in the pathspec; the name
374 * we are looking at must overlap with that directory.
375 */
376 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
377 char ch = *cp;
378 if (ch == '*' || ch == '[' || ch == '?') {
379 meta = cp;
380 break;
381 }
382 }
383 if (!meta)
384 meta = cp; /* fully literal */
386 if (namelen <= meta - match) {
387 /* Looking at "Documentation/" and
388 * the pattern says "Documentation/howto/", or
389 * "Documentation/diff*.txt". The name we
390 * have should match prefix.
391 */
392 if (!memcmp(match, name, namelen))
393 return 1;
394 continue;
395 }
397 if (meta - match < namelen) {
398 /* Looking at "Documentation/howto/" and
399 * the pattern says "Documentation/h*";
400 * match up to "Do.../h"; this avoids descending
401 * into "Documentation/technical/".
402 */
403 if (!memcmp(match, name, meta - match))
404 return 1;
405 continue;
406 }
407 }
408 return 0;
409 }
411 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
412 {
413 void *data;
415 if (use_threads) {
416 read_sha1_lock();
417 data = read_sha1_file(sha1, type, size);
418 read_sha1_unlock();
419 } else {
420 data = read_sha1_file(sha1, type, size);
421 }
422 return data;
423 }
425 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
426 const char *name)
427 {
428 enum object_type type;
429 void *data = lock_and_read_sha1_file(sha1, &type, size);
431 if (!data)
432 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
434 return data;
435 }
437 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
438 const char *filename, int tree_name_len)
439 {
440 struct strbuf pathbuf = STRBUF_INIT;
441 char *name;
443 if (opt->relative && opt->prefix_length) {
444 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
445 opt->prefix);
446 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
447 } else {
448 strbuf_addstr(&pathbuf, filename);
449 }
451 name = strbuf_detach(&pathbuf, NULL);
453 #ifndef NO_PTHREADS
454 if (use_threads) {
455 grep_sha1_async(opt, name, sha1);
456 return 0;
457 } else
458 #endif
459 {
460 int hit;
461 unsigned long sz;
462 void *data = load_sha1(sha1, &sz, name);
463 if (!data)
464 hit = 0;
465 else
466 hit = grep_buffer(opt, name, data, sz);
468 free(data);
469 free(name);
470 return hit;
471 }
472 }
474 static void *load_file(const char *filename, size_t *sz)
475 {
476 struct stat st;
477 char *data;
478 int i;
480 if (lstat(filename, &st) < 0) {
481 err_ret:
482 if (errno != ENOENT)
483 error("'%s': %s", filename, strerror(errno));
484 return 0;
485 }
486 if (!S_ISREG(st.st_mode))
487 return 0;
488 *sz = xsize_t(st.st_size);
489 i = open(filename, O_RDONLY);
490 if (i < 0)
491 goto err_ret;
492 data = xmalloc(*sz + 1);
493 if (st.st_size != read_in_full(i, data, *sz)) {
494 error("'%s': short read %s", filename, strerror(errno));
495 close(i);
496 free(data);
497 return 0;
498 }
499 close(i);
500 data[*sz] = 0;
501 return data;
502 }
504 static int grep_file(struct grep_opt *opt, const char *filename)
505 {
506 struct strbuf buf = STRBUF_INIT;
507 char *name;
509 if (opt->relative && opt->prefix_length)
510 quote_path_relative(filename, -1, &buf, opt->prefix);
511 else
512 strbuf_addstr(&buf, filename);
513 name = strbuf_detach(&buf, NULL);
515 #ifndef NO_PTHREADS
516 if (use_threads) {
517 grep_file_async(opt, name, filename);
518 return 0;
519 } else
520 #endif
521 {
522 int hit;
523 size_t sz;
524 void *data = load_file(filename, &sz);
525 if (!data)
526 hit = 0;
527 else
528 hit = grep_buffer(opt, name, data, sz);
530 free(data);
531 free(name);
532 return hit;
533 }
534 }
536 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
537 {
538 int hit = 0;
539 int nr;
540 read_cache();
542 for (nr = 0; nr < active_nr; nr++) {
543 struct cache_entry *ce = active_cache[nr];
544 if (!S_ISREG(ce->ce_mode))
545 continue;
546 if (!pathspec_matches(paths, ce->name, opt->max_depth))
547 continue;
548 /*
549 * If CE_VALID is on, we assume worktree file and its cache entry
550 * are identical, even if worktree file has been modified, so use
551 * cache version instead
552 */
553 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
554 if (ce_stage(ce))
555 continue;
556 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
557 }
558 else
559 hit |= grep_file(opt, ce->name);
560 if (ce_stage(ce)) {
561 do {
562 nr++;
563 } while (nr < active_nr &&
564 !strcmp(ce->name, active_cache[nr]->name));
565 nr--; /* compensate for loop control */
566 }
567 if (hit && opt->status_only)
568 break;
569 }
570 free_grep_patterns(opt);
571 return hit;
572 }
574 static int grep_tree(struct grep_opt *opt, const char **paths,
575 struct tree_desc *tree,
576 const char *tree_name, const char *base)
577 {
578 int len;
579 int hit = 0;
580 struct name_entry entry;
581 char *down;
582 int tn_len = strlen(tree_name);
583 struct strbuf pathbuf;
585 strbuf_init(&pathbuf, PATH_MAX + tn_len);
587 if (tn_len) {
588 strbuf_add(&pathbuf, tree_name, tn_len);
589 strbuf_addch(&pathbuf, ':');
590 tn_len = pathbuf.len;
591 }
592 strbuf_addstr(&pathbuf, base);
593 len = pathbuf.len;
595 while (tree_entry(tree, &entry)) {
596 int te_len = tree_entry_len(entry.path, entry.sha1);
597 pathbuf.len = len;
598 strbuf_add(&pathbuf, entry.path, te_len);
600 if (S_ISDIR(entry.mode))
601 /* Match "abc/" against pathspec to
602 * decide if we want to descend into "abc"
603 * directory.
604 */
605 strbuf_addch(&pathbuf, '/');
607 down = pathbuf.buf + tn_len;
608 if (!pathspec_matches(paths, down, opt->max_depth))
609 ;
610 else if (S_ISREG(entry.mode))
611 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
612 else if (S_ISDIR(entry.mode)) {
613 enum object_type type;
614 struct tree_desc sub;
615 void *data;
616 unsigned long size;
618 data = lock_and_read_sha1_file(entry.sha1, &type, &size);
619 if (!data)
620 die("unable to read tree (%s)",
621 sha1_to_hex(entry.sha1));
622 init_tree_desc(&sub, data, size);
623 hit |= grep_tree(opt, paths, &sub, tree_name, down);
624 free(data);
625 }
626 if (hit && opt->status_only)
627 break;
628 }
629 strbuf_release(&pathbuf);
630 return hit;
631 }
633 static int grep_object(struct grep_opt *opt, const char **paths,
634 struct object *obj, const char *name)
635 {
636 if (obj->type == OBJ_BLOB)
637 return grep_sha1(opt, obj->sha1, name, 0);
638 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
639 struct tree_desc tree;
640 void *data;
641 unsigned long size;
642 int hit;
643 data = read_object_with_reference(obj->sha1, tree_type,
644 &size, NULL);
645 if (!data)
646 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
647 init_tree_desc(&tree, data, size);
648 hit = grep_tree(opt, paths, &tree, name, "");
649 free(data);
650 return hit;
651 }
652 die("unable to grep from object of type %s", typename(obj->type));
653 }
655 static int context_callback(const struct option *opt, const char *arg,
656 int unset)
657 {
658 struct grep_opt *grep_opt = opt->value;
659 int value;
660 const char *endp;
662 if (unset) {
663 grep_opt->pre_context = grep_opt->post_context = 0;
664 return 0;
665 }
666 value = strtol(arg, (char **)&endp, 10);
667 if (*endp) {
668 return error("switch `%c' expects a numerical value",
669 opt->short_name);
670 }
671 grep_opt->pre_context = grep_opt->post_context = value;
672 return 0;
673 }
675 static int file_callback(const struct option *opt, const char *arg, int unset)
676 {
677 struct grep_opt *grep_opt = opt->value;
678 FILE *patterns;
679 int lno = 0;
680 struct strbuf sb = STRBUF_INIT;
682 patterns = fopen(arg, "r");
683 if (!patterns)
684 die_errno("cannot open '%s'", arg);
685 while (strbuf_getline(&sb, patterns, '\n') == 0) {
686 /* ignore empty line like grep does */
687 if (sb.len == 0)
688 continue;
689 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
690 ++lno, GREP_PATTERN);
691 }
692 fclose(patterns);
693 strbuf_release(&sb);
694 return 0;
695 }
697 static int not_callback(const struct option *opt, const char *arg, int unset)
698 {
699 struct grep_opt *grep_opt = opt->value;
700 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
701 return 0;
702 }
704 static int and_callback(const struct option *opt, const char *arg, int unset)
705 {
706 struct grep_opt *grep_opt = opt->value;
707 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
708 return 0;
709 }
711 static int open_callback(const struct option *opt, const char *arg, int unset)
712 {
713 struct grep_opt *grep_opt = opt->value;
714 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
715 return 0;
716 }
718 static int close_callback(const struct option *opt, const char *arg, int unset)
719 {
720 struct grep_opt *grep_opt = opt->value;
721 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
722 return 0;
723 }
725 static int pattern_callback(const struct option *opt, const char *arg,
726 int unset)
727 {
728 struct grep_opt *grep_opt = opt->value;
729 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
730 return 0;
731 }
733 static int help_callback(const struct option *opt, const char *arg, int unset)
734 {
735 return -1;
736 }
738 int cmd_grep(int argc, const char **argv, const char *prefix)
739 {
740 int hit = 0;
741 int cached = 0;
742 int seen_dashdash = 0;
743 int external_grep_allowed__ignored;
744 struct grep_opt opt;
745 struct object_array list = { 0, 0, NULL };
746 const char **paths = NULL;
747 int i;
748 int dummy;
749 struct option options[] = {
750 OPT_BOOLEAN(0, "cached", &cached,
751 "search in index instead of in the work tree"),
752 OPT_GROUP(""),
753 OPT_BOOLEAN('v', "invert-match", &opt.invert,
754 "show non-matching lines"),
755 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
756 "case insensitive matching"),
757 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
758 "match patterns only at word boundaries"),
759 OPT_SET_INT('a', "text", &opt.binary,
760 "process binary files as text", GREP_BINARY_TEXT),
761 OPT_SET_INT('I', NULL, &opt.binary,
762 "don't match patterns in binary files",
763 GREP_BINARY_NOMATCH),
764 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
765 "descend at most <depth> levels", PARSE_OPT_NONEG,
766 NULL, 1 },
767 OPT_GROUP(""),
768 OPT_BIT('E', "extended-regexp", &opt.regflags,
769 "use extended POSIX regular expressions", REG_EXTENDED),
770 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
771 "use basic POSIX regular expressions (default)",
772 REG_EXTENDED),
773 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
774 "interpret patterns as fixed strings"),
775 OPT_GROUP(""),
776 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
777 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
778 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
779 OPT_NEGBIT(0, "full-name", &opt.relative,
780 "show filenames relative to top directory", 1),
781 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
782 "show only filenames instead of matching lines"),
783 OPT_BOOLEAN(0, "name-only", &opt.name_only,
784 "synonym for --files-with-matches"),
785 OPT_BOOLEAN('L', "files-without-match",
786 &opt.unmatch_name_only,
787 "show only the names of files without match"),
788 OPT_BOOLEAN('z', "null", &opt.null_following_name,
789 "print NUL after filenames"),
790 OPT_BOOLEAN('c', "count", &opt.count,
791 "show the number of matches instead of matching lines"),
792 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
793 OPT_GROUP(""),
794 OPT_CALLBACK('C', NULL, &opt, "n",
795 "show <n> context lines before and after matches",
796 context_callback),
797 OPT_INTEGER('B', NULL, &opt.pre_context,
798 "show <n> context lines before matches"),
799 OPT_INTEGER('A', NULL, &opt.post_context,
800 "show <n> context lines after matches"),
801 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
802 context_callback),
803 OPT_BOOLEAN('p', "show-function", &opt.funcname,
804 "show a line with the function name before matches"),
805 OPT_GROUP(""),
806 OPT_CALLBACK('f', NULL, &opt, "file",
807 "read patterns from file", file_callback),
808 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
809 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
810 { OPTION_CALLBACK, 0, "and", &opt, NULL,
811 "combine patterns specified with -e",
812 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
813 OPT_BOOLEAN(0, "or", &dummy, ""),
814 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
815 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
816 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
817 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
818 open_callback },
819 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
820 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
821 close_callback },
822 OPT_BOOLEAN('q', "quiet", &opt.status_only,
823 "indicate hit with exit status without output"),
824 OPT_BOOLEAN(0, "all-match", &opt.all_match,
825 "show only matches from files that match all patterns"),
826 OPT_GROUP(""),
827 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
828 "allow calling of grep(1) (ignored by this build)"),
829 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
830 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
831 OPT_END()
832 };
834 /*
835 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
836 * to show usage information and exit.
837 */
838 if (argc == 2 && !strcmp(argv[1], "-h"))
839 usage_with_options(grep_usage, options);
841 memset(&opt, 0, sizeof(opt));
842 opt.prefix = prefix;
843 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
844 opt.relative = 1;
845 opt.pathname = 1;
846 opt.pattern_tail = &opt.pattern_list;
847 opt.header_tail = &opt.header_list;
848 opt.regflags = REG_NEWLINE;
849 opt.max_depth = -1;
851 strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
852 opt.color = -1;
853 git_config(grep_config, &opt);
854 if (opt.color == -1)
855 opt.color = git_use_color_default;
857 /*
858 * If there is no -- then the paths must exist in the working
859 * tree. If there is no explicit pattern specified with -e or
860 * -f, we take the first unrecognized non option to be the
861 * pattern, but then what follows it must be zero or more
862 * valid refs up to the -- (if exists), and then existing
863 * paths. If there is an explicit pattern, then the first
864 * unrecognized non option is the beginning of the refs list
865 * that continues up to the -- (if exists), and then paths.
866 */
867 argc = parse_options(argc, argv, prefix, options, grep_usage,
868 PARSE_OPT_KEEP_DASHDASH |
869 PARSE_OPT_STOP_AT_NON_OPTION |
870 PARSE_OPT_NO_INTERNAL_HELP);
872 /*
873 * skip a -- separator; we know it cannot be
874 * separating revisions from pathnames if
875 * we haven't even had any patterns yet
876 */
877 if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
878 argv++;
879 argc--;
880 }
882 /* First unrecognized non-option token */
883 if (argc > 0 && !opt.pattern_list) {
884 append_grep_pattern(&opt, argv[0], "command line", 0,
885 GREP_PATTERN);
886 argv++;
887 argc--;
888 }
890 if (!opt.pattern_list)
891 die("no pattern given.");
892 if (!opt.fixed && opt.ignore_case)
893 opt.regflags |= REG_ICASE;
894 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
895 die("cannot mix --fixed-strings and regexp");
897 #ifndef NO_PTHREADS
898 if (online_cpus() == 1 || !grep_threads_ok(&opt))
899 use_threads = 0;
901 if (use_threads)
902 start_threads(&opt);
903 #else
904 use_threads = 0;
905 #endif
907 compile_grep_patterns(&opt);
909 /* Check revs and then paths */
910 for (i = 0; i < argc; i++) {
911 const char *arg = argv[i];
912 unsigned char sha1[20];
913 /* Is it a rev? */
914 if (!get_sha1(arg, sha1)) {
915 struct object *object = parse_object(sha1);
916 if (!object)
917 die("bad object %s", arg);
918 add_object_array(object, arg, &list);
919 continue;
920 }
921 if (!strcmp(arg, "--")) {
922 i++;
923 seen_dashdash = 1;
924 }
925 break;
926 }
928 /* The rest are paths */
929 if (!seen_dashdash) {
930 int j;
931 for (j = i; j < argc; j++)
932 verify_filename(prefix, argv[j]);
933 }
935 if (i < argc)
936 paths = get_pathspec(prefix, argv + i);
937 else if (prefix) {
938 paths = xcalloc(2, sizeof(const char *));
939 paths[0] = prefix;
940 paths[1] = NULL;
941 }
943 if (!list.nr) {
944 int hit;
945 if (!cached)
946 setup_work_tree();
948 hit = grep_cache(&opt, paths, cached);
949 if (use_threads)
950 hit |= wait_all();
951 return !hit;
952 }
954 if (cached)
955 die("both --cached and trees are given.");
957 for (i = 0; i < list.nr; i++) {
958 struct object *real_obj;
959 real_obj = deref_tag(list.objects[i].item, NULL, 0);
960 if (grep_object(&opt, paths, real_obj, list.objects[i].name)) {
961 hit = 1;
962 if (opt.status_only)
963 break;
964 }
965 }
967 if (use_threads)
968 hit |= wait_all();
969 free_grep_patterns(&opt);
970 return !hit;
971 }