Merge branch 'jc/maint-ident-missing-human-name'
[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
21 static char const * const grep_usage[] = {
22         N_("git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]"),
23         NULL
24 };
25
26 static int use_threads = 1;
27
28 #ifndef NO_PTHREADS
29 #define THREADS 8
30 static pthread_t threads[THREADS];
31
32 /* We use one producer thread and THREADS consumer
33  * threads. The producer adds struct work_items to 'todo' and the
34  * consumers pick work items from the same array.
35  */
36 struct work_item {
37         struct grep_source source;
38         char done;
39         struct strbuf out;
40 };
41
42 /* In the range [todo_done, todo_start) in 'todo' we have work_items
43  * that have been or are processed by a consumer thread. We haven't
44  * written the result for these to stdout yet.
45  *
46  * The work_items in [todo_start, todo_end) are waiting to be picked
47  * up by a consumer thread.
48  *
49  * The ranges are modulo TODO_SIZE.
50  */
51 #define TODO_SIZE 128
52 static struct work_item todo[TODO_SIZE];
53 static int todo_start;
54 static int todo_end;
55 static int todo_done;
56
57 /* Has all work items been added? */
58 static int all_work_added;
59
60 /* This lock protects all the variables above. */
61 static pthread_mutex_t grep_mutex;
62
63 static inline void grep_lock(void)
64 {
65         if (use_threads)
66                 pthread_mutex_lock(&grep_mutex);
67 }
68
69 static inline void grep_unlock(void)
70 {
71         if (use_threads)
72                 pthread_mutex_unlock(&grep_mutex);
73 }
74
75 /* Signalled when a new work_item is added to todo. */
76 static pthread_cond_t cond_add;
77
78 /* Signalled when the result from one work_item is written to
79  * stdout.
80  */
81 static pthread_cond_t cond_write;
82
83 /* Signalled when we are finished with everything. */
84 static pthread_cond_t cond_result;
85
86 static int skip_first_line;
87
88 static void add_work(struct grep_opt *opt, enum grep_source_type type,
89                      const char *name, const void *id)
90 {
91         grep_lock();
92
93         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
94                 pthread_cond_wait(&cond_write, &grep_mutex);
95         }
96
97         grep_source_init(&todo[todo_end].source, type, name, id);
98         if (opt->binary != GREP_BINARY_TEXT)
99                 grep_source_load_driver(&todo[todo_end].source);
100         todo[todo_end].done = 0;
101         strbuf_reset(&todo[todo_end].out);
102         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
103
104         pthread_cond_signal(&cond_add);
105         grep_unlock();
106 }
107
108 static struct work_item *get_work(void)
109 {
110         struct work_item *ret;
111
112         grep_lock();
113         while (todo_start == todo_end && !all_work_added) {
114                 pthread_cond_wait(&cond_add, &grep_mutex);
115         }
116
117         if (todo_start == todo_end && all_work_added) {
118                 ret = NULL;
119         } else {
120                 ret = &todo[todo_start];
121                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
122         }
123         grep_unlock();
124         return ret;
125 }
126
127 static void work_done(struct work_item *w)
128 {
129         int old_done;
130
131         grep_lock();
132         w->done = 1;
133         old_done = todo_done;
134         for(; todo[todo_done].done && todo_done != todo_start;
135             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
136                 w = &todo[todo_done];
137                 if (w->out.len) {
138                         const char *p = w->out.buf;
139                         size_t len = w->out.len;
140
141                         /* Skip the leading hunk mark of the first file. */
142                         if (skip_first_line) {
143                                 while (len) {
144                                         len--;
145                                         if (*p++ == '\n')
146                                                 break;
147                                 }
148                                 skip_first_line = 0;
149                         }
150
151                         write_or_die(1, p, len);
152                 }
153                 grep_source_clear(&w->source);
154         }
155
156         if (old_done != todo_done)
157                 pthread_cond_signal(&cond_write);
158
159         if (all_work_added && todo_done == todo_end)
160                 pthread_cond_signal(&cond_result);
161
162         grep_unlock();
163 }
164
165 static void *run(void *arg)
166 {
167         int hit = 0;
168         struct grep_opt *opt = arg;
169
170         while (1) {
171                 struct work_item *w = get_work();
172                 if (!w)
173                         break;
174
175                 opt->output_priv = w;
176                 hit |= grep_source(opt, &w->source);
177                 grep_source_clear_data(&w->source);
178                 work_done(w);
179         }
180         free_grep_patterns(arg);
181         free(arg);
182
183         return (void*) (intptr_t) hit;
184 }
185
186 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
187 {
188         struct work_item *w = opt->output_priv;
189         strbuf_add(&w->out, buf, size);
190 }
191
192 static void start_threads(struct grep_opt *opt)
193 {
194         int i;
195
196         pthread_mutex_init(&grep_mutex, NULL);
197         pthread_mutex_init(&grep_read_mutex, NULL);
198         pthread_mutex_init(&grep_attr_mutex, NULL);
199         pthread_cond_init(&cond_add, NULL);
200         pthread_cond_init(&cond_write, NULL);
201         pthread_cond_init(&cond_result, NULL);
202         grep_use_locks = 1;
203
204         for (i = 0; i < ARRAY_SIZE(todo); i++) {
205                 strbuf_init(&todo[i].out, 0);
206         }
207
208         for (i = 0; i < ARRAY_SIZE(threads); i++) {
209                 int err;
210                 struct grep_opt *o = grep_opt_dup(opt);
211                 o->output = strbuf_out;
212                 compile_grep_patterns(o);
213                 err = pthread_create(&threads[i], NULL, run, o);
214
215                 if (err)
216                         die(_("grep: failed to create thread: %s"),
217                             strerror(err));
218         }
219 }
220
221 static int wait_all(void)
222 {
223         int hit = 0;
224         int i;
225
226         grep_lock();
227         all_work_added = 1;
228
229         /* Wait until all work is done. */
230         while (todo_done != todo_end)
231                 pthread_cond_wait(&cond_result, &grep_mutex);
232
233         /* Wake up all the consumer threads so they can see that there
234          * is no more work to do.
235          */
236         pthread_cond_broadcast(&cond_add);
237         grep_unlock();
238
239         for (i = 0; i < ARRAY_SIZE(threads); i++) {
240                 void *h;
241                 pthread_join(threads[i], &h);
242                 hit |= (int) (intptr_t) h;
243         }
244
245         pthread_mutex_destroy(&grep_mutex);
246         pthread_mutex_destroy(&grep_read_mutex);
247         pthread_mutex_destroy(&grep_attr_mutex);
248         pthread_cond_destroy(&cond_add);
249         pthread_cond_destroy(&cond_write);
250         pthread_cond_destroy(&cond_result);
251         grep_use_locks = 0;
252
253         return hit;
254 }
255 #else /* !NO_PTHREADS */
256
257 static int wait_all(void)
258 {
259         return 0;
260 }
261 #endif
262
263 static int parse_pattern_type_arg(const char *opt, const char *arg)
264 {
265         if (!strcmp(arg, "default"))
266                 return GREP_PATTERN_TYPE_UNSPECIFIED;
267         else if (!strcmp(arg, "basic"))
268                 return GREP_PATTERN_TYPE_BRE;
269         else if (!strcmp(arg, "extended"))
270                 return GREP_PATTERN_TYPE_ERE;
271         else if (!strcmp(arg, "fixed"))
272                 return GREP_PATTERN_TYPE_FIXED;
273         else if (!strcmp(arg, "perl"))
274                 return GREP_PATTERN_TYPE_PCRE;
275         die("bad %s argument: %s", opt, arg);
276 }
277
278 static void grep_pattern_type_options(const int pattern_type, struct grep_opt *opt)
279 {
280         switch (pattern_type) {
281         case GREP_PATTERN_TYPE_UNSPECIFIED:
282                 /* fall through */
283
284         case GREP_PATTERN_TYPE_BRE:
285                 opt->fixed = 0;
286                 opt->pcre = 0;
287                 opt->regflags &= ~REG_EXTENDED;
288                 break;
289
290         case GREP_PATTERN_TYPE_ERE:
291                 opt->fixed = 0;
292                 opt->pcre = 0;
293                 opt->regflags |= REG_EXTENDED;
294                 break;
295
296         case GREP_PATTERN_TYPE_FIXED:
297                 opt->fixed = 1;
298                 opt->pcre = 0;
299                 opt->regflags &= ~REG_EXTENDED;
300                 break;
301
302         case GREP_PATTERN_TYPE_PCRE:
303                 opt->fixed = 0;
304                 opt->pcre = 1;
305                 opt->regflags &= ~REG_EXTENDED;
306                 break;
307         }
308 }
309
310 static int grep_config(const char *var, const char *value, void *cb)
311 {
312         struct grep_opt *opt = cb;
313         char *color = NULL;
314
315         if (userdiff_config(var, value) < 0)
316                 return -1;
317
318         if (!strcmp(var, "grep.extendedregexp")) {
319                 if (git_config_bool(var, value))
320                         opt->extended_regexp_option = 1;
321                 else
322                         opt->extended_regexp_option = 0;
323                 return 0;
324         }
325
326         if (!strcmp(var, "grep.patterntype")) {
327                 opt->pattern_type_option = parse_pattern_type_arg(var, value);
328                 return 0;
329   }
330
331         if (!strcmp(var, "grep.linenumber")) {
332                 opt->linenum = git_config_bool(var, value);
333                 return 0;
334         }
335
336         if (!strcmp(var, "color.grep"))
337                 opt->color = git_config_colorbool(var, value);
338         else if (!strcmp(var, "color.grep.context"))
339                 color = opt->color_context;
340         else if (!strcmp(var, "color.grep.filename"))
341                 color = opt->color_filename;
342         else if (!strcmp(var, "color.grep.function"))
343                 color = opt->color_function;
344         else if (!strcmp(var, "color.grep.linenumber"))
345                 color = opt->color_lineno;
346         else if (!strcmp(var, "color.grep.match"))
347                 color = opt->color_match;
348         else if (!strcmp(var, "color.grep.selected"))
349                 color = opt->color_selected;
350         else if (!strcmp(var, "color.grep.separator"))
351                 color = opt->color_sep;
352         else
353                 return git_color_default_config(var, value, cb);
354         if (color) {
355                 if (!value)
356                         return config_error_nonbool(var);
357                 color_parse(value, var, color);
358         }
359         return 0;
360 }
361
362 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
363 {
364         void *data;
365
366         grep_read_lock();
367         data = read_sha1_file(sha1, type, size);
368         grep_read_unlock();
369         return data;
370 }
371
372 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
373                      const char *filename, int tree_name_len)
374 {
375         struct strbuf pathbuf = STRBUF_INIT;
376
377         if (opt->relative && opt->prefix_length) {
378                 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
379                                     opt->prefix);
380                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
381         } else {
382                 strbuf_addstr(&pathbuf, filename);
383         }
384
385 #ifndef NO_PTHREADS
386         if (use_threads) {
387                 add_work(opt, GREP_SOURCE_SHA1, pathbuf.buf, sha1);
388                 strbuf_release(&pathbuf);
389                 return 0;
390         } else
391 #endif
392         {
393                 struct grep_source gs;
394                 int hit;
395
396                 grep_source_init(&gs, GREP_SOURCE_SHA1, pathbuf.buf, sha1);
397                 strbuf_release(&pathbuf);
398                 hit = grep_source(opt, &gs);
399
400                 grep_source_clear(&gs);
401                 return hit;
402         }
403 }
404
405 static int grep_file(struct grep_opt *opt, const char *filename)
406 {
407         struct strbuf buf = STRBUF_INIT;
408
409         if (opt->relative && opt->prefix_length)
410                 quote_path_relative(filename, -1, &buf, opt->prefix);
411         else
412                 strbuf_addstr(&buf, filename);
413
414 #ifndef NO_PTHREADS
415         if (use_threads) {
416                 add_work(opt, GREP_SOURCE_FILE, buf.buf, filename);
417                 strbuf_release(&buf);
418                 return 0;
419         } else
420 #endif
421         {
422                 struct grep_source gs;
423                 int hit;
424
425                 grep_source_init(&gs, GREP_SOURCE_FILE, buf.buf, filename);
426                 strbuf_release(&buf);
427                 hit = grep_source(opt, &gs);
428
429                 grep_source_clear(&gs);
430                 return hit;
431         }
432 }
433
434 static void append_path(struct grep_opt *opt, const void *data, size_t len)
435 {
436         struct string_list *path_list = opt->output_priv;
437
438         if (len == 1 && *(const char *)data == '\0')
439                 return;
440         string_list_append(path_list, xstrndup(data, len));
441 }
442
443 static void run_pager(struct grep_opt *opt, const char *prefix)
444 {
445         struct string_list *path_list = opt->output_priv;
446         const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
447         int i, status;
448
449         for (i = 0; i < path_list->nr; i++)
450                 argv[i] = path_list->items[i].string;
451         argv[path_list->nr] = NULL;
452
453         if (prefix && chdir(prefix))
454                 die(_("Failed to chdir: %s"), prefix);
455         status = run_command_v_opt(argv, RUN_USING_SHELL);
456         if (status)
457                 exit(status);
458         free(argv);
459 }
460
461 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
462 {
463         int hit = 0;
464         int nr;
465         read_cache();
466
467         for (nr = 0; nr < active_nr; nr++) {
468                 struct cache_entry *ce = active_cache[nr];
469                 if (!S_ISREG(ce->ce_mode))
470                         continue;
471                 if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
472                         continue;
473                 /*
474                  * If CE_VALID is on, we assume worktree file and its cache entry
475                  * are identical, even if worktree file has been modified, so use
476                  * cache version instead
477                  */
478                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
479                         if (ce_stage(ce))
480                                 continue;
481                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
482                 }
483                 else
484                         hit |= grep_file(opt, ce->name);
485                 if (ce_stage(ce)) {
486                         do {
487                                 nr++;
488                         } while (nr < active_nr &&
489                                  !strcmp(ce->name, active_cache[nr]->name));
490                         nr--; /* compensate for loop control */
491                 }
492                 if (hit && opt->status_only)
493                         break;
494         }
495         return hit;
496 }
497
498 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
499                      struct tree_desc *tree, struct strbuf *base, int tn_len)
500 {
501         int hit = 0;
502         enum interesting match = entry_not_interesting;
503         struct name_entry entry;
504         int old_baselen = base->len;
505
506         while (tree_entry(tree, &entry)) {
507                 int te_len = tree_entry_len(&entry);
508
509                 if (match != all_entries_interesting) {
510                         match = tree_entry_interesting(&entry, base, tn_len, pathspec);
511                         if (match == all_entries_not_interesting)
512                                 break;
513                         if (match == entry_not_interesting)
514                                 continue;
515                 }
516
517                 strbuf_add(base, entry.path, te_len);
518
519                 if (S_ISREG(entry.mode)) {
520                         hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
521                 }
522                 else if (S_ISDIR(entry.mode)) {
523                         enum object_type type;
524                         struct tree_desc sub;
525                         void *data;
526                         unsigned long size;
527
528                         data = lock_and_read_sha1_file(entry.sha1, &type, &size);
529                         if (!data)
530                                 die(_("unable to read tree (%s)"),
531                                     sha1_to_hex(entry.sha1));
532
533                         strbuf_addch(base, '/');
534                         init_tree_desc(&sub, data, size);
535                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
536                         free(data);
537                 }
538                 strbuf_setlen(base, old_baselen);
539
540                 if (hit && opt->status_only)
541                         break;
542         }
543         return hit;
544 }
545
546 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
547                        struct object *obj, const char *name)
548 {
549         if (obj->type == OBJ_BLOB)
550                 return grep_sha1(opt, obj->sha1, name, 0);
551         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
552                 struct tree_desc tree;
553                 void *data;
554                 unsigned long size;
555                 struct strbuf base;
556                 int hit, len;
557
558                 grep_read_lock();
559                 data = read_object_with_reference(obj->sha1, tree_type,
560                                                   &size, NULL);
561                 grep_read_unlock();
562
563                 if (!data)
564                         die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
565
566                 len = name ? strlen(name) : 0;
567                 strbuf_init(&base, PATH_MAX + len + 1);
568                 if (len) {
569                         strbuf_add(&base, name, len);
570                         strbuf_addch(&base, ':');
571                 }
572                 init_tree_desc(&tree, data, size);
573                 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
574                 strbuf_release(&base);
575                 free(data);
576                 return hit;
577         }
578         die(_("unable to grep from object of type %s"), typename(obj->type));
579 }
580
581 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
582                         const struct object_array *list)
583 {
584         unsigned int i;
585         int hit = 0;
586         const unsigned int nr = list->nr;
587
588         for (i = 0; i < nr; i++) {
589                 struct object *real_obj;
590                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
591                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
592                         hit = 1;
593                         if (opt->status_only)
594                                 break;
595                 }
596         }
597         return hit;
598 }
599
600 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
601                           int exc_std)
602 {
603         struct dir_struct dir;
604         int i, hit = 0;
605
606         memset(&dir, 0, sizeof(dir));
607         if (exc_std)
608                 setup_standard_excludes(&dir);
609
610         fill_directory(&dir, pathspec->raw);
611         for (i = 0; i < dir.nr; i++) {
612                 const char *name = dir.entries[i]->name;
613                 int namelen = strlen(name);
614                 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
615                         continue;
616                 hit |= grep_file(opt, dir.entries[i]->name);
617                 if (hit && opt->status_only)
618                         break;
619         }
620         return hit;
621 }
622
623 static int context_callback(const struct option *opt, const char *arg,
624                             int unset)
625 {
626         struct grep_opt *grep_opt = opt->value;
627         int value;
628         const char *endp;
629
630         if (unset) {
631                 grep_opt->pre_context = grep_opt->post_context = 0;
632                 return 0;
633         }
634         value = strtol(arg, (char **)&endp, 10);
635         if (*endp) {
636                 return error(_("switch `%c' expects a numerical value"),
637                              opt->short_name);
638         }
639         grep_opt->pre_context = grep_opt->post_context = value;
640         return 0;
641 }
642
643 static int file_callback(const struct option *opt, const char *arg, int unset)
644 {
645         struct grep_opt *grep_opt = opt->value;
646         int from_stdin = !strcmp(arg, "-");
647         FILE *patterns;
648         int lno = 0;
649         struct strbuf sb = STRBUF_INIT;
650
651         patterns = from_stdin ? stdin : fopen(arg, "r");
652         if (!patterns)
653                 die_errno(_("cannot open '%s'"), arg);
654         while (strbuf_getline(&sb, patterns, '\n') == 0) {
655                 /* ignore empty line like grep does */
656                 if (sb.len == 0)
657                         continue;
658
659                 append_grep_pat(grep_opt, sb.buf, sb.len, arg, ++lno,
660                                 GREP_PATTERN);
661         }
662         if (!from_stdin)
663                 fclose(patterns);
664         strbuf_release(&sb);
665         return 0;
666 }
667
668 static int not_callback(const struct option *opt, const char *arg, int unset)
669 {
670         struct grep_opt *grep_opt = opt->value;
671         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
672         return 0;
673 }
674
675 static int and_callback(const struct option *opt, const char *arg, int unset)
676 {
677         struct grep_opt *grep_opt = opt->value;
678         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
679         return 0;
680 }
681
682 static int open_callback(const struct option *opt, const char *arg, int unset)
683 {
684         struct grep_opt *grep_opt = opt->value;
685         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
686         return 0;
687 }
688
689 static int close_callback(const struct option *opt, const char *arg, int unset)
690 {
691         struct grep_opt *grep_opt = opt->value;
692         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
693         return 0;
694 }
695
696 static int pattern_callback(const struct option *opt, const char *arg,
697                             int unset)
698 {
699         struct grep_opt *grep_opt = opt->value;
700         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
701         return 0;
702 }
703
704 static int help_callback(const struct option *opt, const char *arg, int unset)
705 {
706         return -1;
707 }
708
709 int cmd_grep(int argc, const char **argv, const char *prefix)
710 {
711         int hit = 0;
712         int cached = 0, untracked = 0, opt_exclude = -1;
713         int seen_dashdash = 0;
714         int external_grep_allowed__ignored;
715         const char *show_in_pager = NULL, *default_pager = "dummy";
716         struct grep_opt opt;
717         struct object_array list = OBJECT_ARRAY_INIT;
718         const char **paths = NULL;
719         struct pathspec pathspec;
720         struct string_list path_list = STRING_LIST_INIT_NODUP;
721         int i;
722         int dummy;
723         int use_index = 1;
724         int pattern_type_arg = GREP_PATTERN_TYPE_UNSPECIFIED;
725
726         struct option options[] = {
727                 OPT_BOOLEAN(0, "cached", &cached,
728                         N_("search in index instead of in the work tree")),
729                 OPT_NEGBIT(0, "no-index", &use_index,
730                          N_("find in contents not managed by git"), 1),
731                 OPT_BOOLEAN(0, "untracked", &untracked,
732                         N_("search in both tracked and untracked files")),
733                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
734                             N_("search also in ignored files"), 1),
735                 OPT_GROUP(""),
736                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
737                         N_("show non-matching lines")),
738                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
739                         N_("case insensitive matching")),
740                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
741                         N_("match patterns only at word boundaries")),
742                 OPT_SET_INT('a', "text", &opt.binary,
743                         N_("process binary files as text"), GREP_BINARY_TEXT),
744                 OPT_SET_INT('I', NULL, &opt.binary,
745                         N_("don't match patterns in binary files"),
746                         GREP_BINARY_NOMATCH),
747                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, N_("depth"),
748                         N_("descend at most <depth> levels"), PARSE_OPT_NONEG,
749                         NULL, 1 },
750                 OPT_GROUP(""),
751                 OPT_SET_INT('E', "extended-regexp", &pattern_type_arg,
752                             N_("use extended POSIX regular expressions"),
753                             GREP_PATTERN_TYPE_ERE),
754                 OPT_SET_INT('G', "basic-regexp", &pattern_type_arg,
755                             N_("use basic POSIX regular expressions (default)"),
756                             GREP_PATTERN_TYPE_BRE),
757                 OPT_SET_INT('F', "fixed-strings", &pattern_type_arg,
758                             N_("interpret patterns as fixed strings"),
759                             GREP_PATTERN_TYPE_FIXED),
760                 OPT_SET_INT('P', "perl-regexp", &pattern_type_arg,
761                             N_("use Perl-compatible regular expressions"),
762                             GREP_PATTERN_TYPE_PCRE),
763                 OPT_GROUP(""),
764                 OPT_BOOLEAN('n', "line-number", &opt.linenum, N_("show line numbers")),
765                 OPT_NEGBIT('h', NULL, &opt.pathname, N_("don't show filenames"), 1),
766                 OPT_BIT('H', NULL, &opt.pathname, N_("show filenames"), 1),
767                 OPT_NEGBIT(0, "full-name", &opt.relative,
768                         N_("show filenames relative to top directory"), 1),
769                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
770                         N_("show only filenames instead of matching lines")),
771                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
772                         N_("synonym for --files-with-matches")),
773                 OPT_BOOLEAN('L', "files-without-match",
774                         &opt.unmatch_name_only,
775                         N_("show only the names of files without match")),
776                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
777                         N_("print NUL after filenames")),
778                 OPT_BOOLEAN('c', "count", &opt.count,
779                         N_("show the number of matches instead of matching lines")),
780                 OPT__COLOR(&opt.color, N_("highlight matches")),
781                 OPT_BOOLEAN(0, "break", &opt.file_break,
782                         N_("print empty line between matches from different files")),
783                 OPT_BOOLEAN(0, "heading", &opt.heading,
784                         N_("show filename only once above matches from same file")),
785                 OPT_GROUP(""),
786                 OPT_CALLBACK('C', "context", &opt, N_("n"),
787                         N_("show <n> context lines before and after matches"),
788                         context_callback),
789                 OPT_INTEGER('B', "before-context", &opt.pre_context,
790                         N_("show <n> context lines before matches")),
791                 OPT_INTEGER('A', "after-context", &opt.post_context,
792                         N_("show <n> context lines after matches")),
793                 OPT_NUMBER_CALLBACK(&opt, N_("shortcut for -C NUM"),
794                         context_callback),
795                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
796                         N_("show a line with the function name before matches")),
797                 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
798                         N_("show the surrounding function")),
799                 OPT_GROUP(""),
800                 OPT_CALLBACK('f', NULL, &opt, N_("file"),
801                         N_("read patterns from file"), file_callback),
802                 { OPTION_CALLBACK, 'e', NULL, &opt, N_("pattern"),
803                         N_("match <pattern>"), PARSE_OPT_NONEG, pattern_callback },
804                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
805                   N_("combine patterns specified with -e"),
806                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
807                 OPT_BOOLEAN(0, "or", &dummy, ""),
808                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
809                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
810                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
811                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
812                   open_callback },
813                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
814                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
815                   close_callback },
816                 OPT__QUIET(&opt.status_only,
817                            N_("indicate hit with exit status without output")),
818                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
819                         N_("show only matches from files that match all patterns")),
820                 OPT_GROUP(""),
821                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
822                         N_("pager"), N_("show matching files in the pager"),
823                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
824                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
825                             N_("allow calling of grep(1) (ignored by this build)")),
826                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, N_("show usage"),
827                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
828                 OPT_END()
829         };
830
831         /*
832          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
833          * to show usage information and exit.
834          */
835         if (argc == 2 && !strcmp(argv[1], "-h"))
836                 usage_with_options(grep_usage, options);
837
838         memset(&opt, 0, sizeof(opt));
839         opt.prefix = prefix;
840         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
841         opt.relative = 1;
842         opt.pathname = 1;
843         opt.pattern_tail = &opt.pattern_list;
844         opt.header_tail = &opt.header_list;
845         opt.regflags = REG_NEWLINE;
846         opt.max_depth = -1;
847         opt.pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
848         opt.extended_regexp_option = 0;
849
850         strcpy(opt.color_context, "");
851         strcpy(opt.color_filename, "");
852         strcpy(opt.color_function, "");
853         strcpy(opt.color_lineno, "");
854         strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
855         strcpy(opt.color_selected, "");
856         strcpy(opt.color_sep, GIT_COLOR_CYAN);
857         opt.color = -1;
858         git_config(grep_config, &opt);
859
860         /*
861          * If there is no -- then the paths must exist in the working
862          * tree.  If there is no explicit pattern specified with -e or
863          * -f, we take the first unrecognized non option to be the
864          * pattern, but then what follows it must be zero or more
865          * valid refs up to the -- (if exists), and then existing
866          * paths.  If there is an explicit pattern, then the first
867          * unrecognized non option is the beginning of the refs list
868          * that continues up to the -- (if exists), and then paths.
869          */
870         argc = parse_options(argc, argv, prefix, options, grep_usage,
871                              PARSE_OPT_KEEP_DASHDASH |
872                              PARSE_OPT_STOP_AT_NON_OPTION |
873                              PARSE_OPT_NO_INTERNAL_HELP);
874
875         if (pattern_type_arg != GREP_PATTERN_TYPE_UNSPECIFIED)
876                 grep_pattern_type_options(pattern_type_arg, &opt);
877         else if (opt.pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
878                 grep_pattern_type_options(opt.pattern_type_option, &opt);
879         else if (opt.extended_regexp_option)
880                 grep_pattern_type_options(GREP_PATTERN_TYPE_ERE, &opt);
881
882         if (use_index && !startup_info->have_repository)
883                 /* die the same way as if we did it at the beginning */
884                 setup_git_directory();
885
886         /*
887          * skip a -- separator; we know it cannot be
888          * separating revisions from pathnames if
889          * we haven't even had any patterns yet
890          */
891         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
892                 argv++;
893                 argc--;
894         }
895
896         /* First unrecognized non-option token */
897         if (argc > 0 && !opt.pattern_list) {
898                 append_grep_pattern(&opt, argv[0], "command line", 0,
899                                     GREP_PATTERN);
900                 argv++;
901                 argc--;
902         }
903
904         if (show_in_pager == default_pager)
905                 show_in_pager = git_pager(1);
906         if (show_in_pager) {
907                 opt.color = 0;
908                 opt.name_only = 1;
909                 opt.null_following_name = 1;
910                 opt.output_priv = &path_list;
911                 opt.output = append_path;
912                 string_list_append(&path_list, show_in_pager);
913                 use_threads = 0;
914         }
915
916         if (!opt.pattern_list)
917                 die(_("no pattern given."));
918         if (!opt.fixed && opt.ignore_case)
919                 opt.regflags |= REG_ICASE;
920
921         compile_grep_patterns(&opt);
922
923         /* Check revs and then paths */
924         for (i = 0; i < argc; i++) {
925                 const char *arg = argv[i];
926                 unsigned char sha1[20];
927                 /* Is it a rev? */
928                 if (!get_sha1(arg, sha1)) {
929                         struct object *object = parse_object(sha1);
930                         if (!object)
931                                 die(_("bad object %s"), arg);
932                         add_object_array(object, arg, &list);
933                         continue;
934                 }
935                 if (!strcmp(arg, "--")) {
936                         i++;
937                         seen_dashdash = 1;
938                 }
939                 break;
940         }
941
942 #ifndef NO_PTHREADS
943         if (list.nr || cached || online_cpus() == 1)
944                 use_threads = 0;
945 #else
946         use_threads = 0;
947 #endif
948
949 #ifndef NO_PTHREADS
950         if (use_threads) {
951                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
952                     && (opt.pre_context || opt.post_context ||
953                         opt.file_break || opt.funcbody))
954                         skip_first_line = 1;
955                 start_threads(&opt);
956         }
957 #endif
958
959         /* The rest are paths */
960         if (!seen_dashdash) {
961                 int j;
962                 for (j = i; j < argc; j++)
963                         verify_filename(prefix, argv[j], j == i);
964         }
965
966         paths = get_pathspec(prefix, argv + i);
967         init_pathspec(&pathspec, paths);
968         pathspec.max_depth = opt.max_depth;
969         pathspec.recursive = 1;
970
971         if (show_in_pager && (cached || list.nr))
972                 die(_("--open-files-in-pager only works on the worktree"));
973
974         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
975                 const char *pager = path_list.items[0].string;
976                 int len = strlen(pager);
977
978                 if (len > 4 && is_dir_sep(pager[len - 5]))
979                         pager += len - 4;
980
981                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
982                         struct strbuf buf = STRBUF_INIT;
983                         strbuf_addf(&buf, "+/%s%s",
984                                         strcmp("less", pager) ? "" : "*",
985                                         opt.pattern_list->pattern);
986                         string_list_append(&path_list, buf.buf);
987                         strbuf_detach(&buf, NULL);
988                 }
989         }
990
991         if (!show_in_pager)
992                 setup_pager();
993
994         if (!use_index && (untracked || cached))
995                 die(_("--cached or --untracked cannot be used with --no-index."));
996
997         if (!use_index || untracked) {
998                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
999                 if (list.nr)
1000                         die(_("--no-index or --untracked cannot be used with revs."));
1001                 hit = grep_directory(&opt, &pathspec, use_exclude);
1002         } else if (0 <= opt_exclude) {
1003                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1004         } else if (!list.nr) {
1005                 if (!cached)
1006                         setup_work_tree();
1007
1008                 hit = grep_cache(&opt, &pathspec, cached);
1009         } else {
1010                 if (cached)
1011                         die(_("both --cached and trees are given."));
1012                 hit = grep_objects(&opt, &pathspec, &list);
1013         }
1014
1015         if (use_threads)
1016                 hit |= wait_all();
1017         if (hit && show_in_pager)
1018                 run_pager(&opt, prefix);
1019         free_grep_patterns(&opt);
1020         return !hit;
1021 }