Merge 'http-msys-paths' into HEAD
[git/mingw/4msysgit.git] / builtin / grep.c
blob2cd9ec9019d49c23946df9200a5bfe70429ba1d5
1 /*
2 * Builtin "git grep"
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 "pathspec.h"
21 #include "attr.h"
23 static char const * const grep_usage[] = {
24 N_("git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]"),
25 NULL
28 static int use_threads = 1;
30 #ifndef NO_PTHREADS
31 #define THREADS 8
32 static pthread_t threads[THREADS];
34 /* We use one producer thread and THREADS consumer
35 * threads. The producer adds struct work_items to 'todo' and the
36 * consumers pick work items from the same array.
38 struct work_item {
39 struct grep_source source;
40 char done;
41 struct strbuf out;
44 /* In the range [todo_done, todo_start) in 'todo' we have work_items
45 * that have been or are processed by a consumer thread. We haven't
46 * written the result for these to stdout yet.
48 * The work_items in [todo_start, todo_end) are waiting to be picked
49 * up by a consumer thread.
51 * The ranges are modulo TODO_SIZE.
53 #define TODO_SIZE 128
54 static struct work_item todo[TODO_SIZE];
55 static int todo_start;
56 static int todo_end;
57 static int todo_done;
59 /* Has all work items been added? */
60 static int all_work_added;
62 /* This lock protects all the variables above. */
63 static pthread_mutex_t grep_mutex;
65 static inline void grep_lock(void)
67 if (use_threads)
68 pthread_mutex_lock(&grep_mutex);
71 static inline void grep_unlock(void)
73 if (use_threads)
74 pthread_mutex_unlock(&grep_mutex);
77 /* Signalled when a new work_item is added to todo. */
78 static pthread_cond_t cond_add;
80 /* Signalled when the result from one work_item is written to
81 * stdout.
83 static pthread_cond_t cond_write;
85 /* Signalled when we are finished with everything. */
86 static pthread_cond_t cond_result;
88 static int skip_first_line;
90 static void add_work(struct grep_opt *opt, enum grep_source_type type,
91 const char *name, const char *path, const void *id)
93 grep_lock();
95 while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
96 pthread_cond_wait(&cond_write, &grep_mutex);
99 grep_source_init(&todo[todo_end].source, type, name, path, id);
100 if (opt->binary != GREP_BINARY_TEXT)
101 grep_source_load_driver(&todo[todo_end].source);
102 todo[todo_end].done = 0;
103 strbuf_reset(&todo[todo_end].out);
104 todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
106 pthread_cond_signal(&cond_add);
107 grep_unlock();
110 static struct work_item *get_work(void)
112 struct work_item *ret;
114 grep_lock();
115 while (todo_start == todo_end && !all_work_added) {
116 pthread_cond_wait(&cond_add, &grep_mutex);
119 if (todo_start == todo_end && all_work_added) {
120 ret = NULL;
121 } else {
122 ret = &todo[todo_start];
123 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
125 grep_unlock();
126 return ret;
129 static void work_done(struct work_item *w)
131 int old_done;
133 grep_lock();
134 w->done = 1;
135 old_done = todo_done;
136 for(; todo[todo_done].done && todo_done != todo_start;
137 todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
138 w = &todo[todo_done];
139 if (w->out.len) {
140 const char *p = w->out.buf;
141 size_t len = w->out.len;
143 /* Skip the leading hunk mark of the first file. */
144 if (skip_first_line) {
145 while (len) {
146 len--;
147 if (*p++ == '\n')
148 break;
150 skip_first_line = 0;
153 write_or_die(1, p, len);
155 grep_source_clear(&w->source);
158 if (old_done != todo_done)
159 pthread_cond_signal(&cond_write);
161 if (all_work_added && todo_done == todo_end)
162 pthread_cond_signal(&cond_result);
164 grep_unlock();
167 static int skip_binary(struct grep_opt *opt, const char *filename)
169 if ((opt->binary & GREP_BINARY_NOMATCH)) {
170 static struct git_attr *attr_text;
171 struct git_attr_check check;
173 if (!attr_text)
174 attr_text = git_attr("text");
175 memset(&check, 0, sizeof(check));
176 check.attr = attr_text;
177 return !git_check_attr(filename, 1, &check) &&
178 ATTR_FALSE(check.value);
180 return 0;
183 static void *run(void *arg)
185 int hit = 0;
186 struct grep_opt *opt = arg;
188 while (1) {
189 struct work_item *w = get_work();
190 if (!w)
191 break;
193 if (skip_binary(opt, (const char *)w->source.identifier))
194 continue;
196 opt->output_priv = w;
197 hit |= grep_source(opt, &w->source);
198 grep_source_clear_data(&w->source);
199 work_done(w);
201 free_grep_patterns(arg);
202 free(arg);
204 return (void*) (intptr_t) hit;
207 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
209 struct work_item *w = opt->output_priv;
210 strbuf_add(&w->out, buf, size);
213 static void start_threads(struct grep_opt *opt)
215 int i;
217 pthread_mutex_init(&grep_mutex, NULL);
218 pthread_mutex_init(&grep_read_mutex, NULL);
219 pthread_mutex_init(&grep_attr_mutex, NULL);
220 pthread_cond_init(&cond_add, NULL);
221 pthread_cond_init(&cond_write, NULL);
222 pthread_cond_init(&cond_result, NULL);
223 grep_use_locks = 1;
225 for (i = 0; i < ARRAY_SIZE(todo); i++) {
226 strbuf_init(&todo[i].out, 0);
229 for (i = 0; i < ARRAY_SIZE(threads); i++) {
230 int err;
231 struct grep_opt *o = grep_opt_dup(opt);
232 o->output = strbuf_out;
233 o->debug = 0;
234 compile_grep_patterns(o);
235 err = pthread_create(&threads[i], NULL, run, o);
237 if (err)
238 die(_("grep: failed to create thread: %s"),
239 strerror(err));
243 static int wait_all(void)
245 int hit = 0;
246 int i;
248 grep_lock();
249 all_work_added = 1;
251 /* Wait until all work is done. */
252 while (todo_done != todo_end)
253 pthread_cond_wait(&cond_result, &grep_mutex);
255 /* Wake up all the consumer threads so they can see that there
256 * is no more work to do.
258 pthread_cond_broadcast(&cond_add);
259 grep_unlock();
261 for (i = 0; i < ARRAY_SIZE(threads); i++) {
262 void *h;
263 pthread_join(threads[i], &h);
264 hit |= (int) (intptr_t) h;
267 pthread_mutex_destroy(&grep_mutex);
268 pthread_mutex_destroy(&grep_read_mutex);
269 pthread_mutex_destroy(&grep_attr_mutex);
270 pthread_cond_destroy(&cond_add);
271 pthread_cond_destroy(&cond_write);
272 pthread_cond_destroy(&cond_result);
273 grep_use_locks = 0;
275 return hit;
277 #else /* !NO_PTHREADS */
279 static int wait_all(void)
281 return 0;
283 #endif
285 static int grep_cmd_config(const char *var, const char *value, void *cb)
287 int st = grep_config(var, value, cb);
288 if (git_color_default_config(var, value, cb) < 0)
289 st = -1;
290 return st;
293 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
295 void *data;
297 grep_read_lock();
298 data = read_sha1_file(sha1, type, size);
299 grep_read_unlock();
300 return data;
303 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
304 const char *filename, int tree_name_len,
305 const char *path)
307 struct strbuf pathbuf = STRBUF_INIT;
309 if (opt->relative && opt->prefix_length) {
310 quote_path_relative(filename + tree_name_len, opt->prefix, &pathbuf);
311 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
312 } else {
313 strbuf_addstr(&pathbuf, filename);
316 #ifndef NO_PTHREADS
317 if (use_threads) {
318 add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, path, sha1);
319 strbuf_release(&pathbuf);
320 return 0;
321 } else
322 #endif
324 struct grep_source gs;
325 int hit;
327 grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, path, sha1);
328 strbuf_release(&pathbuf);
329 hit = grep_source(opt, &gs);
331 grep_source_clear(&gs);
332 return hit;
336 static int grep_file(struct grep_opt *opt, const char *filename)
338 struct strbuf buf = STRBUF_INIT;
340 if (opt->relative && opt->prefix_length)
341 quote_path_relative(filename, opt->prefix, &buf);
342 else
343 strbuf_addstr(&buf, filename);
345 #ifndef NO_PTHREADS
346 if (use_threads) {
347 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename, filename);
348 strbuf_release(&buf);
349 return 0;
350 } else
351 #endif
353 struct grep_source gs;
354 int hit;
356 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename, filename);
357 strbuf_release(&buf);
358 hit = grep_source(opt, &gs);
360 grep_source_clear(&gs);
361 return hit;
365 static void append_path(struct grep_opt *opt, const void *data, size_t len)
367 struct string_list *path_list = opt->output_priv;
369 if (len == 1 && *(const char *)data == '\0')
370 return;
371 string_list_append(path_list, xstrndup(data, len));
374 static void run_pager(struct grep_opt *opt, const char *prefix)
376 struct string_list *path_list = opt->output_priv;
377 const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
378 int i, status;
380 for (i = 0; i < path_list->nr; i++)
381 argv[i] = path_list->items[i].string;
382 argv[path_list->nr] = NULL;
384 if (prefix && chdir(prefix))
385 die(_("Failed to chdir: %s"), prefix);
386 status = run_command_v_opt(argv, RUN_USING_SHELL);
387 if (status)
388 exit(status);
389 free(argv);
392 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
394 int hit = 0;
395 int nr;
396 read_cache();
398 for (nr = 0; nr < active_nr; nr++) {
399 const struct cache_entry *ce = active_cache[nr];
400 if (!S_ISREG(ce->ce_mode))
401 continue;
402 if (!ce_path_match(ce, pathspec, NULL))
403 continue;
404 if (skip_binary(opt, ce->name))
405 continue;
408 * If CE_VALID is on, we assume worktree file and its cache entry
409 * are identical, even if worktree file has been modified, so use
410 * cache version instead
412 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
413 if (ce_stage(ce))
414 continue;
415 hit |= grep_sha1(opt, ce->sha1, ce->name, 0, ce->name);
417 else
418 hit |= grep_file(opt, ce->name);
419 if (ce_stage(ce)) {
420 do {
421 nr++;
422 } while (nr < active_nr &&
423 !strcmp(ce->name, active_cache[nr]->name));
424 nr--; /* compensate for loop control */
426 if (hit && opt->status_only)
427 break;
429 return hit;
432 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
433 struct tree_desc *tree, struct strbuf *base, int tn_len,
434 int check_attr)
436 int hit = 0;
437 enum interesting match = entry_not_interesting;
438 struct name_entry entry;
439 int old_baselen = base->len;
441 while (tree_entry(tree, &entry)) {
442 int te_len = tree_entry_len(&entry);
444 if (match != all_entries_interesting) {
445 match = tree_entry_interesting(&entry, base, tn_len, pathspec);
446 if (match == all_entries_not_interesting)
447 break;
448 if (match == entry_not_interesting)
449 continue;
452 strbuf_add(base, entry.path, te_len);
454 if (S_ISREG(entry.mode)) {
455 hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len,
456 check_attr ? base->buf + tn_len : NULL);
458 else if (S_ISDIR(entry.mode)) {
459 enum object_type type;
460 struct tree_desc sub;
461 void *data;
462 unsigned long size;
464 data = lock_and_read_sha1_file(entry.sha1, &type, &size);
465 if (!data)
466 die(_("unable to read tree (%s)"),
467 sha1_to_hex(entry.sha1));
469 strbuf_addch(base, '/');
470 init_tree_desc(&sub, data, size);
471 hit |= grep_tree(opt, pathspec, &sub, base, tn_len,
472 check_attr);
473 free(data);
475 strbuf_setlen(base, old_baselen);
477 if (hit && opt->status_only)
478 break;
480 return hit;
483 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
484 struct object *obj, const char *name, struct object_context *oc)
486 if (obj->type == OBJ_BLOB)
487 return grep_sha1(opt, obj->sha1, name, 0, oc ? oc->path : NULL);
488 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
489 struct tree_desc tree;
490 void *data;
491 unsigned long size;
492 struct strbuf base;
493 int hit, len;
495 grep_read_lock();
496 data = read_object_with_reference(obj->sha1, tree_type,
497 &size, NULL);
498 grep_read_unlock();
500 if (!data)
501 die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
503 len = name ? strlen(name) : 0;
504 strbuf_init(&base, PATH_MAX + len + 1);
505 if (len) {
506 strbuf_add(&base, name, len);
507 strbuf_addch(&base, ':');
509 init_tree_desc(&tree, data, size);
510 hit = grep_tree(opt, pathspec, &tree, &base, base.len,
511 obj->type == OBJ_COMMIT);
512 strbuf_release(&base);
513 free(data);
514 return hit;
516 die(_("unable to grep from object of type %s"), typename(obj->type));
519 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
520 const struct object_array *list)
522 unsigned int i;
523 int hit = 0;
524 const unsigned int nr = list->nr;
526 for (i = 0; i < nr; i++) {
527 struct object *real_obj;
528 real_obj = deref_tag(list->objects[i].item, NULL, 0);
529 if (grep_object(opt, pathspec, real_obj, list->objects[i].name, list->objects[i].context)) {
530 hit = 1;
531 if (opt->status_only)
532 break;
535 return hit;
538 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
539 int exc_std)
541 struct dir_struct dir;
542 int i, hit = 0;
544 memset(&dir, 0, sizeof(dir));
545 if (exc_std)
546 setup_standard_excludes(&dir);
548 fill_directory(&dir, pathspec);
549 for (i = 0; i < dir.nr; i++) {
550 if (!dir_path_match(dir.entries[i], pathspec, 0, NULL))
551 continue;
552 hit |= grep_file(opt, dir.entries[i]->name);
553 if (hit && opt->status_only)
554 break;
556 return hit;
559 static int context_callback(const struct option *opt, const char *arg,
560 int unset)
562 struct grep_opt *grep_opt = opt->value;
563 int value;
564 const char *endp;
566 if (unset) {
567 grep_opt->pre_context = grep_opt->post_context = 0;
568 return 0;
570 value = strtol(arg, (char **)&endp, 10);
571 if (*endp) {
572 return error(_("switch `%c' expects a numerical value"),
573 opt->short_name);
575 grep_opt->pre_context = grep_opt->post_context = value;
576 return 0;
579 static int file_callback(const struct option *opt, const char *arg, int unset)
581 struct grep_opt *grep_opt = opt->value;
582 int from_stdin = !strcmp(arg, "-");
583 FILE *patterns;
584 int lno = 0;
585 struct strbuf sb = STRBUF_INIT;
587 patterns = from_stdin ? stdin : fopen(arg, "r");
588 if (!patterns)
589 die_errno(_("cannot open '%s'"), arg);
590 while (strbuf_getline(&sb, patterns, '\n') == 0) {
591 /* ignore empty line like grep does */
592 if (sb.len == 0)
593 continue;
595 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
596 GREP_PATTERN);
598 if (!from_stdin)
599 fclose(patterns);
600 strbuf_release(&sb);
601 return 0;
604 static int not_callback(const struct option *opt, const char *arg, int unset)
606 struct grep_opt *grep_opt = opt->value;
607 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
608 return 0;
611 static int and_callback(const struct option *opt, const char *arg, int unset)
613 struct grep_opt *grep_opt = opt->value;
614 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
615 return 0;
618 static int open_callback(const struct option *opt, const char *arg, int unset)
620 struct grep_opt *grep_opt = opt->value;
621 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
622 return 0;
625 static int close_callback(const struct option *opt, const char *arg, int unset)
627 struct grep_opt *grep_opt = opt->value;
628 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
629 return 0;
632 static int pattern_callback(const struct option *opt, const char *arg,
633 int unset)
635 struct grep_opt *grep_opt = opt->value;
636 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
637 return 0;
640 static int help_callback(const struct option *opt, const char *arg, int unset)
642 return -1;
645 int cmd_grep(int argc, const char **argv, const char *prefix)
647 int hit = 0;
648 int cached = 0, untracked = 0, opt_exclude = -1;
649 int seen_dashdash = 0;
650 int external_grep_allowed__ignored;
651 const char *show_in_pager = NULL, *default_pager = "dummy";
652 struct grep_opt opt;
653 struct object_array list = OBJECT_ARRAY_INIT;
654 struct pathspec pathspec;
655 struct string_list path_list = STRING_LIST_INIT_NODUP;
656 int i;
657 int dummy;
658 int use_index = 1;
659 int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
661 struct option options[] = {
662 OPT_BOOL(0, "cached", &cached,
663 N_("search in index instead of in the work tree")),
664 OPT_NEGBIT(0, "no-index", &use_index,
665 N_("find in contents not managed by git"), 1),
666 OPT_BOOL(0, "untracked", &untracked,
667 N_("search in both tracked and untracked files")),
668 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
669 N_("search also in ignored files"), 1),
670 OPT_GROUP(""),
671 OPT_BOOL('v', "invert-match", &opt.invert,
672 N_("show non-matching lines")),
673 OPT_BOOL('i', "ignore-case", &opt.ignore_case,
674 N_("case insensitive matching")),
675 OPT_BOOL('w', "word-regexp", &opt.word_regexp,
676 N_("match patterns only at word boundaries")),
677 OPT_SET_INT('a', "text", &opt.binary,
678 N_("process binary files as text"), GREP_BINARY_TEXT),
679 OPT_SET_INT('I', NULL, &opt.binary,
680 N_("don't match patterns in binary files"),
681 GREP_BINARY_NOMATCH),
682 OPT_BOOL(0, "textconv", &opt.allow_textconv,
683 N_("process binary files with textconv filters")),
684 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
685 N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
686 NULL, 1 },
687 OPT_GROUP(""),
688 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
689 N_("use extended POSIX regular expressions"),
690 GREP_PATTERN_TYPE_ERE),
691 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
692 N_("use basic POSIX regular expressions (default)"),
693 GREP_PATTERN_TYPE_BRE),
694 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
695 N_("interpret patterns as fixed strings"),
696 GREP_PATTERN_TYPE_FIXED),
697 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
698 N_("use Perl-compatible regular expressions"),
699 GREP_PATTERN_TYPE_PCRE),
700 OPT_GROUP(""),
701 OPT_BOOL('n', "line-number", &opt.linenum, N_("show line numbers")),
702 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
703 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
704 OPT_NEGBIT(0, "full-name", &opt.relative,
705 N_("show filenames relative to top directory"), 1),
706 OPT_BOOL('l', "files-with-matches", &opt.name_only,
707 N_("show only filenames instead of matching lines")),
708 OPT_BOOL(0, "name-only", &opt.name_only,
709 N_("synonym for --files-with-matches")),
710 OPT_BOOL('L', "files-without-match",
711 &opt.unmatch_name_only,
712 N_("show only the names of files without match")),
713 OPT_BOOL('z', "null", &opt.null_following_name,
714 N_("print NUL after filenames")),
715 OPT_BOOL('c', "count", &opt.count,
716 N_("show the number of matches instead of matching lines")),
717 OPT__COLOR(&opt.color, N_("highlight matches")),
718 OPT_BOOL(0, "break", &opt.file_break,
719 N_("print empty line between matches from different files")),
720 OPT_BOOL(0, "heading", &opt.heading,
721 N_("show filename only once above matches from same file")),
722 OPT_GROUP(""),
723 OPT_CALLBACK('C', "context", &opt, N_("n"),
724 N_("show <n> context lines before and after matches"),
725 context_callback),
726 OPT_INTEGER('B', "before-context", &opt.pre_context,
727 N_("show <n> context lines before matches")),
728 OPT_INTEGER('A', "after-context", &opt.post_context,
729 N_("show <n> context lines after matches")),
730 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
731 context_callback),
732 OPT_BOOL('p', "show-function", &opt.funcname,
733 N_("show a line with the function name before matches")),
734 OPT_BOOL('W', "function-context", &opt.funcbody,
735 N_("show the surrounding function")),
736 OPT_GROUP(""),
737 OPT_CALLBACK('f', NULL, &opt, N_("file"),
738 N_("read patterns from file"), file_callback),
739 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
740 N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
741 { OPTION_CALLBACK, 0, "and", &opt, NULL,
742 N_("combine patterns specified with -e"),
743 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
744 OPT_BOOL(0, "or", &dummy, ""),
745 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
746 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
747 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
748 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
749 open_callback },
750 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
751 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
752 close_callback },
753 OPT__QUIET(&opt.status_only,
754 N_("indicate hit with exit status without output")),
755 OPT_BOOL(0, "all-match", &opt.all_match,
756 N_("show only matches from files that match all patterns")),
757 { OPTION_SET_INT, 0, "debug", &opt.debug, NULL,
758 N_("show parse tree for grep expression"),
759 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1 },
760 OPT_GROUP(""),
761 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
762 N_("pager"), N_("show matching files in the pager"),
763 PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
764 OPT_BOOL(0, "ext-grep", &external_grep_allowed__ignored,
765 N_("allow calling of grep(1) (ignored by this build)")),
766 { OPTION_CALLBACK, 0, "help-all", &options, NULL, N_("show usage"),
767 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
768 OPT_END()
772 * 'git grep -h', unlike 'git grep -h <pattern>', is a request
773 * to show usage information and exit.
775 if (argc == 2 && !strcmp(argv[1], "-h"))
776 usage_with_options(grep_usage, options);
778 init_grep_defaults();
779 git_config(grep_cmd_config, NULL);
780 grep_init(&opt, prefix);
783 * If there is no -- then the paths must exist in the working
784 * tree. If there is no explicit pattern specified with -e or
785 * -f, we take the first unrecognized non option to be the
786 * pattern, but then what follows it must be zero or more
787 * valid refs up to the -- (if exists), and then existing
788 * paths. If there is an explicit pattern, then the first
789 * unrecognized non option is the beginning of the refs list
790 * that continues up to the -- (if exists), and then paths.
792 argc = parse_options(argc, argv, prefix, options, grep_usage,
793 PARSE_OPT_KEEP_DASHDASH |
794 PARSE_OPT_STOP_AT_NON_OPTION |
795 PARSE_OPT_NO_INTERNAL_HELP);
796 grep_commit_pattern_type(pattern_type_arg, &opt);
798 if (use_index && !startup_info->have_repository)
799 /* die the same way as if we did it at the beginning */
800 setup_git_directory();
803 * skip a -- separator; we know it cannot be
804 * separating revisions from pathnames if
805 * we haven't even had any patterns yet
807 if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
808 argv++;
809 argc--;
812 /* First unrecognized non-option token */
813 if (argc > 0 && !opt.pattern_list) {
814 append_grep_pattern(&opt, argv[0], "command line", 0,
815 GREP_PATTERN);
816 argv++;
817 argc--;
820 if (show_in_pager == default_pager)
821 show_in_pager = git_pager(1);
822 if (show_in_pager) {
823 opt.color = 0;
824 opt.name_only = 1;
825 opt.null_following_name = 1;
826 opt.output_priv = &path_list;
827 opt.output = append_path;
828 string_list_append(&path_list, show_in_pager);
829 use_threads = 0;
831 if ((opt.binary & GREP_BINARY_NOMATCH))
832 use_threads = 0;
834 if (!opt.pattern_list)
835 die(_("no pattern given."));
836 if (!opt.fixed && opt.ignore_case)
837 opt.regflags |= REG_ICASE;
839 compile_grep_patterns(&opt);
841 /* Check revs and then paths */
842 for (i = 0; i < argc; i++) {
843 const char *arg = argv[i];
844 unsigned char sha1[20];
845 struct object_context oc;
846 /* Is it a rev? */
847 if (!get_sha1_with_context(arg, 0, sha1, &oc)) {
848 struct object *object = parse_object_or_die(sha1, arg);
849 if (!seen_dashdash)
850 verify_non_filename(prefix, arg);
851 add_object_array_with_context(object, arg, &list, xmemdupz(&oc, sizeof(struct object_context)));
852 continue;
854 if (!strcmp(arg, "--")) {
855 i++;
856 seen_dashdash = 1;
858 break;
861 #ifndef NO_PTHREADS
862 if (list.nr || cached || online_cpus() == 1)
863 use_threads = 0;
864 #else
865 use_threads = 0;
866 #endif
868 #ifndef NO_PTHREADS
869 if (use_threads) {
870 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
871 && (opt.pre_context || opt.post_context ||
872 opt.file_break || opt.funcbody))
873 skip_first_line = 1;
874 start_threads(&opt);
876 #endif
878 /* The rest are paths */
879 if (!seen_dashdash) {
880 int j;
881 for (j = i; j < argc; j++)
882 verify_filename(prefix, argv[j], j == i);
885 parse_pathspec(&pathspec, 0,
886 PATHSPEC_PREFER_CWD |
887 (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
888 prefix, argv + i);
889 pathspec.max_depth = opt.max_depth;
890 pathspec.recursive = 1;
892 if (show_in_pager && (cached || list.nr))
893 die(_("--open-files-in-pager only works on the worktree"));
895 if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
896 const char *pager = path_list.items[0].string;
897 int len = strlen(pager);
899 if (len > 4 && is_dir_sep(pager[len - 5]))
900 pager += len - 4;
902 if (opt.ignore_case && !strcmp("less", pager))
903 string_list_append(&path_list, "-i");
905 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
906 struct strbuf buf = STRBUF_INIT;
907 strbuf_addf(&buf, "+/%s%s",
908 strcmp("less", pager) ? "" : "*",
909 opt.pattern_list->pattern);
910 string_list_append(&path_list, buf.buf);
911 strbuf_detach(&buf, NULL);
915 if (!show_in_pager)
916 setup_pager();
918 if (!use_index && (untracked || cached))
919 die(_("--cached or --untracked cannot be used with --no-index."));
921 if (!use_index || untracked) {
922 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
923 if (list.nr)
924 die(_("--no-index or --untracked cannot be used with revs."));
925 hit = grep_directory(&opt, &pathspec, use_exclude);
926 } else if (0 <= opt_exclude) {
927 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
928 } else if (!list.nr) {
929 if (!cached)
930 setup_work_tree();
932 hit = grep_cache(&opt, &pathspec, cached);
933 } else {
934 if (cached)
935 die(_("both --cached and trees are given."));
936 hit = grep_objects(&opt, &pathspec, &list);
939 if (use_threads)
940 hit |= wait_all();
941 if (hit && show_in_pager)
942 run_pager(&opt, prefix);
943 free_grep_patterns(&opt);
944 return !hit;