Code

aeb361663ac020fa4859d367dfffc191cc0846ae
[git.git] / builtin / grep.c
1 /*
2  * Builtin "git grep"
3  *
4  * Copyright (c) 2006 Junio C Hamano
5  */
6 #include "cache.h"
7 #include "blob.h"
8 #include "tree.h"
9 #include "commit.h"
10 #include "tag.h"
11 #include "tree-walk.h"
12 #include "builtin.h"
13 #include "parse-options.h"
14 #include "string-list.h"
15 #include "run-command.h"
16 #include "userdiff.h"
17 #include "grep.h"
18 #include "quote.h"
19 #include "dir.h"
21 static char const * const grep_usage[] = {
22         "git grep [options] [-e] <pattern> [<rev>...] [[--] <path>...]",
23         NULL
24 };
26 static int use_threads = 1;
28 #ifndef NO_PTHREADS
29 #define THREADS 8
30 static pthread_t threads[THREADS];
32 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
33                        const char *name);
34 static void *load_file(const char *filename, size_t *sz);
36 enum work_type {WORK_SHA1, WORK_FILE};
38 /* We use one producer thread and THREADS consumer
39  * threads. The producer adds struct work_items to 'todo' and the
40  * consumers pick work items from the same array.
41  */
42 struct work_item {
43         enum work_type type;
44         char *name;
46         /* if type == WORK_SHA1, then 'identifier' is a SHA1,
47          * otherwise type == WORK_FILE, and 'identifier' is a NUL
48          * terminated filename.
49          */
50         void *identifier;
51         char done;
52         struct strbuf out;
53 };
55 /* In the range [todo_done, todo_start) in 'todo' we have work_items
56  * that have been or are processed by a consumer thread. We haven't
57  * written the result for these to stdout yet.
58  *
59  * The work_items in [todo_start, todo_end) are waiting to be picked
60  * up by a consumer thread.
61  *
62  * The ranges are modulo TODO_SIZE.
63  */
64 #define TODO_SIZE 128
65 static struct work_item todo[TODO_SIZE];
66 static int todo_start;
67 static int todo_end;
68 static int todo_done;
70 /* Has all work items been added? */
71 static int all_work_added;
73 /* This lock protects all the variables above. */
74 static pthread_mutex_t grep_mutex;
76 static inline void grep_lock(void)
77 {
78         if (use_threads)
79                 pthread_mutex_lock(&grep_mutex);
80 }
82 static inline void grep_unlock(void)
83 {
84         if (use_threads)
85                 pthread_mutex_unlock(&grep_mutex);
86 }
88 /* Signalled when a new work_item is added to todo. */
89 static pthread_cond_t cond_add;
91 /* Signalled when the result from one work_item is written to
92  * stdout.
93  */
94 static pthread_cond_t cond_write;
96 /* Signalled when we are finished with everything. */
97 static pthread_cond_t cond_result;
99 static int skip_first_line;
101 static void add_work(enum work_type type, char *name, void *id)
103         grep_lock();
105         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
106                 pthread_cond_wait(&cond_write, &grep_mutex);
107         }
109         todo[todo_end].type = type;
110         todo[todo_end].name = name;
111         todo[todo_end].identifier = id;
112         todo[todo_end].done = 0;
113         strbuf_reset(&todo[todo_end].out);
114         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
116         pthread_cond_signal(&cond_add);
117         grep_unlock();
120 static struct work_item *get_work(void)
122         struct work_item *ret;
124         grep_lock();
125         while (todo_start == todo_end && !all_work_added) {
126                 pthread_cond_wait(&cond_add, &grep_mutex);
127         }
129         if (todo_start == todo_end && all_work_added) {
130                 ret = NULL;
131         } else {
132                 ret = &todo[todo_start];
133                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
134         }
135         grep_unlock();
136         return ret;
139 static void grep_sha1_async(struct grep_opt *opt, char *name,
140                             const unsigned char *sha1)
142         unsigned char *s;
143         s = xmalloc(20);
144         memcpy(s, sha1, 20);
145         add_work(WORK_SHA1, name, s);
148 static void grep_file_async(struct grep_opt *opt, char *name,
149                             const char *filename)
151         add_work(WORK_FILE, name, xstrdup(filename));
154 static void work_done(struct work_item *w)
156         int old_done;
158         grep_lock();
159         w->done = 1;
160         old_done = todo_done;
161         for(; todo[todo_done].done && todo_done != todo_start;
162             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
163                 w = &todo[todo_done];
164                 if (w->out.len) {
165                         const char *p = w->out.buf;
166                         size_t len = w->out.len;
168                         /* Skip the leading hunk mark of the first file. */
169                         if (skip_first_line) {
170                                 while (len) {
171                                         len--;
172                                         if (*p++ == '\n')
173                                                 break;
174                                 }
175                                 skip_first_line = 0;
176                         }
178                         write_or_die(1, p, len);
179                 }
180                 free(w->name);
181                 free(w->identifier);
182         }
184         if (old_done != todo_done)
185                 pthread_cond_signal(&cond_write);
187         if (all_work_added && todo_done == todo_end)
188                 pthread_cond_signal(&cond_result);
190         grep_unlock();
193 static void *run(void *arg)
195         int hit = 0;
196         struct grep_opt *opt = arg;
198         while (1) {
199                 struct work_item *w = get_work();
200                 if (!w)
201                         break;
203                 opt->output_priv = w;
204                 if (w->type == WORK_SHA1) {
205                         unsigned long sz;
206                         void* data = load_sha1(w->identifier, &sz, w->name);
208                         if (data) {
209                                 hit |= grep_buffer(opt, w->name, data, sz);
210                                 free(data);
211                         }
212                 } else if (w->type == WORK_FILE) {
213                         size_t sz;
214                         void* data = load_file(w->identifier, &sz);
215                         if (data) {
216                                 hit |= grep_buffer(opt, w->name, data, sz);
217                                 free(data);
218                         }
219                 } else {
220                         assert(0);
221                 }
223                 work_done(w);
224         }
225         free_grep_patterns(arg);
226         free(arg);
228         return (void*) (intptr_t) hit;
231 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
233         struct work_item *w = opt->output_priv;
234         strbuf_add(&w->out, buf, size);
237 static void start_threads(struct grep_opt *opt)
239         int i;
241         pthread_mutex_init(&grep_mutex, NULL);
242         pthread_mutex_init(&grep_read_mutex, NULL);
243         pthread_mutex_init(&grep_attr_mutex, NULL);
244         pthread_cond_init(&cond_add, NULL);
245         pthread_cond_init(&cond_write, NULL);
246         pthread_cond_init(&cond_result, NULL);
247         grep_use_locks = 1;
249         for (i = 0; i < ARRAY_SIZE(todo); i++) {
250                 strbuf_init(&todo[i].out, 0);
251         }
253         for (i = 0; i < ARRAY_SIZE(threads); i++) {
254                 int err;
255                 struct grep_opt *o = grep_opt_dup(opt);
256                 o->output = strbuf_out;
257                 compile_grep_patterns(o);
258                 err = pthread_create(&threads[i], NULL, run, o);
260                 if (err)
261                         die(_("grep: failed to create thread: %s"),
262                             strerror(err));
263         }
266 static int wait_all(void)
268         int hit = 0;
269         int i;
271         grep_lock();
272         all_work_added = 1;
274         /* Wait until all work is done. */
275         while (todo_done != todo_end)
276                 pthread_cond_wait(&cond_result, &grep_mutex);
278         /* Wake up all the consumer threads so they can see that there
279          * is no more work to do.
280          */
281         pthread_cond_broadcast(&cond_add);
282         grep_unlock();
284         for (i = 0; i < ARRAY_SIZE(threads); i++) {
285                 void *h;
286                 pthread_join(threads[i], &h);
287                 hit |= (int) (intptr_t) h;
288         }
290         pthread_mutex_destroy(&grep_mutex);
291         pthread_mutex_destroy(&grep_read_mutex);
292         pthread_mutex_destroy(&grep_attr_mutex);
293         pthread_cond_destroy(&cond_add);
294         pthread_cond_destroy(&cond_write);
295         pthread_cond_destroy(&cond_result);
296         grep_use_locks = 0;
298         return hit;
300 #else /* !NO_PTHREADS */
302 static int wait_all(void)
304         return 0;
306 #endif
308 static int grep_config(const char *var, const char *value, void *cb)
310         struct grep_opt *opt = cb;
311         char *color = NULL;
313         switch (userdiff_config(var, value)) {
314         case 0: break;
315         case -1: return -1;
316         default: return 0;
317         }
319         if (!strcmp(var, "grep.extendedregexp")) {
320                 if (git_config_bool(var, value))
321                         opt->regflags |= REG_EXTENDED;
322                 else
323                         opt->regflags &= ~REG_EXTENDED;
324                 return 0;
325         }
327         if (!strcmp(var, "grep.linenumber")) {
328                 opt->linenum = git_config_bool(var, value);
329                 return 0;
330         }
332         if (!strcmp(var, "color.grep"))
333                 opt->color = git_config_colorbool(var, value);
334         else if (!strcmp(var, "color.grep.context"))
335                 color = opt->color_context;
336         else if (!strcmp(var, "color.grep.filename"))
337                 color = opt->color_filename;
338         else if (!strcmp(var, "color.grep.function"))
339                 color = opt->color_function;
340         else if (!strcmp(var, "color.grep.linenumber"))
341                 color = opt->color_lineno;
342         else if (!strcmp(var, "color.grep.match"))
343                 color = opt->color_match;
344         else if (!strcmp(var, "color.grep.selected"))
345                 color = opt->color_selected;
346         else if (!strcmp(var, "color.grep.separator"))
347                 color = opt->color_sep;
348         else
349                 return git_color_default_config(var, value, cb);
350         if (color) {
351                 if (!value)
352                         return config_error_nonbool(var);
353                 color_parse(value, var, color);
354         }
355         return 0;
358 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
360         void *data;
362         grep_read_lock();
363         data = read_sha1_file(sha1, type, size);
364         grep_read_unlock();
365         return data;
368 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
369                        const char *name)
371         enum object_type type;
372         void *data = lock_and_read_sha1_file(sha1, &type, size);
374         if (!data)
375                 error(_("'%s': unable to read %s"), name, sha1_to_hex(sha1));
377         return data;
380 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
381                      const char *filename, int tree_name_len)
383         struct strbuf pathbuf = STRBUF_INIT;
384         char *name;
386         if (opt->relative && opt->prefix_length) {
387                 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
388                                     opt->prefix);
389                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
390         } else {
391                 strbuf_addstr(&pathbuf, filename);
392         }
394         name = strbuf_detach(&pathbuf, NULL);
396 #ifndef NO_PTHREADS
397         if (use_threads) {
398                 grep_sha1_async(opt, name, sha1);
399                 return 0;
400         } else
401 #endif
402         {
403                 int hit;
404                 unsigned long sz;
405                 void *data = load_sha1(sha1, &sz, name);
406                 if (!data)
407                         hit = 0;
408                 else
409                         hit = grep_buffer(opt, name, data, sz);
411                 free(data);
412                 free(name);
413                 return hit;
414         }
417 static void *load_file(const char *filename, size_t *sz)
419         struct stat st;
420         char *data;
421         int i;
423         if (lstat(filename, &st) < 0) {
424         err_ret:
425                 if (errno != ENOENT)
426                         error(_("'%s': %s"), filename, strerror(errno));
427                 return NULL;
428         }
429         if (!S_ISREG(st.st_mode))
430                 return NULL;
431         *sz = xsize_t(st.st_size);
432         i = open(filename, O_RDONLY);
433         if (i < 0)
434                 goto err_ret;
435         data = xmalloc(*sz + 1);
436         if (st.st_size != read_in_full(i, data, *sz)) {
437                 error(_("'%s': short read %s"), filename, strerror(errno));
438                 close(i);
439                 free(data);
440                 return NULL;
441         }
442         close(i);
443         data[*sz] = 0;
444         return data;
447 static int grep_file(struct grep_opt *opt, const char *filename)
449         struct strbuf buf = STRBUF_INIT;
450         char *name;
452         if (opt->relative && opt->prefix_length)
453                 quote_path_relative(filename, -1, &buf, opt->prefix);
454         else
455                 strbuf_addstr(&buf, filename);
456         name = strbuf_detach(&buf, NULL);
458 #ifndef NO_PTHREADS
459         if (use_threads) {
460                 grep_file_async(opt, name, filename);
461                 return 0;
462         } else
463 #endif
464         {
465                 int hit;
466                 size_t sz;
467                 void *data = load_file(filename, &sz);
468                 if (!data)
469                         hit = 0;
470                 else
471                         hit = grep_buffer(opt, name, data, sz);
473                 free(data);
474                 free(name);
475                 return hit;
476         }
479 static void append_path(struct grep_opt *opt, const void *data, size_t len)
481         struct string_list *path_list = opt->output_priv;
483         if (len == 1 && *(const char *)data == '\0')
484                 return;
485         string_list_append(path_list, xstrndup(data, len));
488 static void run_pager(struct grep_opt *opt, const char *prefix)
490         struct string_list *path_list = opt->output_priv;
491         const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
492         int i, status;
494         for (i = 0; i < path_list->nr; i++)
495                 argv[i] = path_list->items[i].string;
496         argv[path_list->nr] = NULL;
498         if (prefix && chdir(prefix))
499                 die(_("Failed to chdir: %s"), prefix);
500         status = run_command_v_opt(argv, RUN_USING_SHELL);
501         if (status)
502                 exit(status);
503         free(argv);
506 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
508         int hit = 0;
509         int nr;
510         read_cache();
512         for (nr = 0; nr < active_nr; nr++) {
513                 struct cache_entry *ce = active_cache[nr];
514                 if (!S_ISREG(ce->ce_mode))
515                         continue;
516                 if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
517                         continue;
518                 /*
519                  * If CE_VALID is on, we assume worktree file and its cache entry
520                  * are identical, even if worktree file has been modified, so use
521                  * cache version instead
522                  */
523                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
524                         if (ce_stage(ce))
525                                 continue;
526                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
527                 }
528                 else
529                         hit |= grep_file(opt, ce->name);
530                 if (ce_stage(ce)) {
531                         do {
532                                 nr++;
533                         } while (nr < active_nr &&
534                                  !strcmp(ce->name, active_cache[nr]->name));
535                         nr--; /* compensate for loop control */
536                 }
537                 if (hit && opt->status_only)
538                         break;
539         }
540         return hit;
543 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
544                      struct tree_desc *tree, struct strbuf *base, int tn_len)
546         int hit = 0;
547         enum interesting match = entry_not_interesting;
548         struct name_entry entry;
549         int old_baselen = base->len;
551         while (tree_entry(tree, &entry)) {
552                 int te_len = tree_entry_len(&entry);
554                 if (match != all_entries_interesting) {
555                         match = tree_entry_interesting(&entry, base, tn_len, pathspec);
556                         if (match == all_entries_not_interesting)
557                                 break;
558                         if (match == entry_not_interesting)
559                                 continue;
560                 }
562                 strbuf_add(base, entry.path, te_len);
564                 if (S_ISREG(entry.mode)) {
565                         hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
566                 }
567                 else if (S_ISDIR(entry.mode)) {
568                         enum object_type type;
569                         struct tree_desc sub;
570                         void *data;
571                         unsigned long size;
573                         data = lock_and_read_sha1_file(entry.sha1, &type, &size);
574                         if (!data)
575                                 die(_("unable to read tree (%s)"),
576                                     sha1_to_hex(entry.sha1));
578                         strbuf_addch(base, '/');
579                         init_tree_desc(&sub, data, size);
580                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
581                         free(data);
582                 }
583                 strbuf_setlen(base, old_baselen);
585                 if (hit && opt->status_only)
586                         break;
587         }
588         return hit;
591 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
592                        struct object *obj, const char *name)
594         if (obj->type == OBJ_BLOB)
595                 return grep_sha1(opt, obj->sha1, name, 0);
596         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
597                 struct tree_desc tree;
598                 void *data;
599                 unsigned long size;
600                 struct strbuf base;
601                 int hit, len;
603                 grep_read_lock();
604                 data = read_object_with_reference(obj->sha1, tree_type,
605                                                   &size, NULL);
606                 grep_read_unlock();
608                 if (!data)
609                         die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
611                 len = name ? strlen(name) : 0;
612                 strbuf_init(&base, PATH_MAX + len + 1);
613                 if (len) {
614                         strbuf_add(&base, name, len);
615                         strbuf_addch(&base, ':');
616                 }
617                 init_tree_desc(&tree, data, size);
618                 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
619                 strbuf_release(&base);
620                 free(data);
621                 return hit;
622         }
623         die(_("unable to grep from object of type %s"), typename(obj->type));
626 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
627                         const struct object_array *list)
629         unsigned int i;
630         int hit = 0;
631         const unsigned int nr = list->nr;
633         for (i = 0; i < nr; i++) {
634                 struct object *real_obj;
635                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
636                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
637                         hit = 1;
638                         if (opt->status_only)
639                                 break;
640                 }
641         }
642         return hit;
645 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
646                           int exc_std)
648         struct dir_struct dir;
649         int i, hit = 0;
651         memset(&dir, 0, sizeof(dir));
652         if (exc_std)
653                 setup_standard_excludes(&dir);
655         fill_directory(&dir, pathspec->raw);
656         for (i = 0; i < dir.nr; i++) {
657                 const char *name = dir.entries[i]->name;
658                 int namelen = strlen(name);
659                 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
660                         continue;
661                 hit |= grep_file(opt, dir.entries[i]->name);
662                 if (hit && opt->status_only)
663                         break;
664         }
665         return hit;
668 static int context_callback(const struct option *opt, const char *arg,
669                             int unset)
671         struct grep_opt *grep_opt = opt->value;
672         int value;
673         const char *endp;
675         if (unset) {
676                 grep_opt->pre_context = grep_opt->post_context = 0;
677                 return 0;
678         }
679         value = strtol(arg, (char **)&endp, 10);
680         if (*endp) {
681                 return error(_("switch `%c' expects a numerical value"),
682                              opt->short_name);
683         }
684         grep_opt->pre_context = grep_opt->post_context = value;
685         return 0;
688 static int file_callback(const struct option *opt, const char *arg, int unset)
690         struct grep_opt *grep_opt = opt->value;
691         int from_stdin = !strcmp(arg, "-");
692         FILE *patterns;
693         int lno = 0;
694         struct strbuf sb = STRBUF_INIT;
696         patterns = from_stdin ? stdin : fopen(arg, "r");
697         if (!patterns)
698                 die_errno(_("cannot open '%s'"), arg);
699         while (strbuf_getline(&sb, patterns, '\n') == 0) {
700                 char *s;
701                 size_t len;
703                 /* ignore empty line like grep does */
704                 if (sb.len == 0)
705                         continue;
707                 s = strbuf_detach(&sb, &len);
708                 append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
709         }
710         if (!from_stdin)
711                 fclose(patterns);
712         strbuf_release(&sb);
713         return 0;
716 static int not_callback(const struct option *opt, const char *arg, int unset)
718         struct grep_opt *grep_opt = opt->value;
719         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
720         return 0;
723 static int and_callback(const struct option *opt, const char *arg, int unset)
725         struct grep_opt *grep_opt = opt->value;
726         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
727         return 0;
730 static int open_callback(const struct option *opt, const char *arg, int unset)
732         struct grep_opt *grep_opt = opt->value;
733         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
734         return 0;
737 static int close_callback(const struct option *opt, const char *arg, int unset)
739         struct grep_opt *grep_opt = opt->value;
740         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
741         return 0;
744 static int pattern_callback(const struct option *opt, const char *arg,
745                             int unset)
747         struct grep_opt *grep_opt = opt->value;
748         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
749         return 0;
752 static int help_callback(const struct option *opt, const char *arg, int unset)
754         return -1;
757 int cmd_grep(int argc, const char **argv, const char *prefix)
759         int hit = 0;
760         int cached = 0, untracked = 0, opt_exclude = -1;
761         int seen_dashdash = 0;
762         int external_grep_allowed__ignored;
763         const char *show_in_pager = NULL, *default_pager = "dummy";
764         struct grep_opt opt;
765         struct object_array list = OBJECT_ARRAY_INIT;
766         const char **paths = NULL;
767         struct pathspec pathspec;
768         struct string_list path_list = STRING_LIST_INIT_NODUP;
769         int i;
770         int dummy;
771         int use_index = 1;
772         enum {
773                 pattern_type_unspecified = 0,
774                 pattern_type_bre,
775                 pattern_type_ere,
776                 pattern_type_fixed,
777                 pattern_type_pcre,
778         };
779         int pattern_type = pattern_type_unspecified;
781         struct option options[] = {
782                 OPT_BOOLEAN(0, "cached", &cached,
783                         "search in index instead of in the work tree"),
784                 { OPTION_BOOLEAN, 0, "index", &use_index, NULL,
785                         "finds in contents not managed by git",
786                         PARSE_OPT_NOARG | PARSE_OPT_NEGHELP },
787                 OPT_BOOLEAN(0, "untracked", &untracked,
788                         "search in both tracked and untracked files"),
789                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
790                             "search also in ignored files", 1),
791                 OPT_GROUP(""),
792                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
793                         "show non-matching lines"),
794                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
795                         "case insensitive matching"),
796                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
797                         "match patterns only at word boundaries"),
798                 OPT_SET_INT('a', "text", &opt.binary,
799                         "process binary files as text", GREP_BINARY_TEXT),
800                 OPT_SET_INT('I', NULL, &opt.binary,
801                         "don't match patterns in binary files",
802                         GREP_BINARY_NOMATCH),
803                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
804                         "descend at most <depth> levels", PARSE_OPT_NONEG,
805                         NULL, 1 },
806                 OPT_GROUP(""),
807                 OPT_SET_INT('E', "extended-regexp", &pattern_type,
808                             "use extended POSIX regular expressions",
809                             pattern_type_ere),
810                 OPT_SET_INT('G', "basic-regexp", &pattern_type,
811                             "use basic POSIX regular expressions (default)",
812                             pattern_type_bre),
813                 OPT_SET_INT('F', "fixed-strings", &pattern_type,
814                             "interpret patterns as fixed strings",
815                             pattern_type_fixed),
816                 OPT_SET_INT('P', "perl-regexp", &pattern_type,
817                             "use Perl-compatible regular expressions",
818                             pattern_type_pcre),
819                 OPT_GROUP(""),
820                 OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
821                 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
822                 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
823                 OPT_NEGBIT(0, "full-name", &opt.relative,
824                         "show filenames relative to top directory", 1),
825                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
826                         "show only filenames instead of matching lines"),
827                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
828                         "synonym for --files-with-matches"),
829                 OPT_BOOLEAN('L', "files-without-match",
830                         &opt.unmatch_name_only,
831                         "show only the names of files without match"),
832                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
833                         "print NUL after filenames"),
834                 OPT_BOOLEAN('c', "count", &opt.count,
835                         "show the number of matches instead of matching lines"),
836                 OPT__COLOR(&opt.color, "highlight matches"),
837                 OPT_BOOLEAN(0, "break", &opt.file_break,
838                         "print empty line between matches from different files"),
839                 OPT_BOOLEAN(0, "heading", &opt.heading,
840                         "show filename only once above matches from same file"),
841                 OPT_GROUP(""),
842                 OPT_CALLBACK('C', "context", &opt, "n",
843                         "show <n> context lines before and after matches",
844                         context_callback),
845                 OPT_INTEGER('B', "before-context", &opt.pre_context,
846                         "show <n> context lines before matches"),
847                 OPT_INTEGER('A', "after-context", &opt.post_context,
848                         "show <n> context lines after matches"),
849                 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
850                         context_callback),
851                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
852                         "show a line with the function name before matches"),
853                 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
854                         "show the surrounding function"),
855                 OPT_GROUP(""),
856                 OPT_CALLBACK('f', NULL, &opt, "file",
857                         "read patterns from file", file_callback),
858                 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
859                         "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
860                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
861                   "combine patterns specified with -e",
862                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
863                 OPT_BOOLEAN(0, "or", &dummy, ""),
864                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
865                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
866                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
867                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
868                   open_callback },
869                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
870                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
871                   close_callback },
872                 OPT__QUIET(&opt.status_only,
873                            "indicate hit with exit status without output"),
874                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
875                         "show only matches from files that match all patterns"),
876                 OPT_GROUP(""),
877                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
878                         "pager", "show matching files in the pager",
879                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
880                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
881                             "allow calling of grep(1) (ignored by this build)"),
882                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
883                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
884                 OPT_END()
885         };
887         /*
888          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
889          * to show usage information and exit.
890          */
891         if (argc == 2 && !strcmp(argv[1], "-h"))
892                 usage_with_options(grep_usage, options);
894         memset(&opt, 0, sizeof(opt));
895         opt.prefix = prefix;
896         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
897         opt.relative = 1;
898         opt.pathname = 1;
899         opt.pattern_tail = &opt.pattern_list;
900         opt.header_tail = &opt.header_list;
901         opt.regflags = REG_NEWLINE;
902         opt.max_depth = -1;
904         strcpy(opt.color_context, "");
905         strcpy(opt.color_filename, "");
906         strcpy(opt.color_function, "");
907         strcpy(opt.color_lineno, "");
908         strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
909         strcpy(opt.color_selected, "");
910         strcpy(opt.color_sep, GIT_COLOR_CYAN);
911         opt.color = -1;
912         git_config(grep_config, &opt);
914         /*
915          * If there is no -- then the paths must exist in the working
916          * tree.  If there is no explicit pattern specified with -e or
917          * -f, we take the first unrecognized non option to be the
918          * pattern, but then what follows it must be zero or more
919          * valid refs up to the -- (if exists), and then existing
920          * paths.  If there is an explicit pattern, then the first
921          * unrecognized non option is the beginning of the refs list
922          * that continues up to the -- (if exists), and then paths.
923          */
924         argc = parse_options(argc, argv, prefix, options, grep_usage,
925                              PARSE_OPT_KEEP_DASHDASH |
926                              PARSE_OPT_STOP_AT_NON_OPTION |
927                              PARSE_OPT_NO_INTERNAL_HELP);
928         switch (pattern_type) {
929         case pattern_type_fixed:
930                 opt.fixed = 1;
931                 opt.pcre = 0;
932                 break;
933         case pattern_type_bre:
934                 opt.fixed = 0;
935                 opt.pcre = 0;
936                 opt.regflags &= ~REG_EXTENDED;
937                 break;
938         case pattern_type_ere:
939                 opt.fixed = 0;
940                 opt.pcre = 0;
941                 opt.regflags |= REG_EXTENDED;
942                 break;
943         case pattern_type_pcre:
944                 opt.fixed = 0;
945                 opt.pcre = 1;
946                 break;
947         default:
948                 break; /* nothing */
949         }
951         if (use_index && !startup_info->have_repository)
952                 /* die the same way as if we did it at the beginning */
953                 setup_git_directory();
955         /*
956          * skip a -- separator; we know it cannot be
957          * separating revisions from pathnames if
958          * we haven't even had any patterns yet
959          */
960         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
961                 argv++;
962                 argc--;
963         }
965         /* First unrecognized non-option token */
966         if (argc > 0 && !opt.pattern_list) {
967                 append_grep_pattern(&opt, argv[0], "command line", 0,
968                                     GREP_PATTERN);
969                 argv++;
970                 argc--;
971         }
973         if (show_in_pager == default_pager)
974                 show_in_pager = git_pager(1);
975         if (show_in_pager) {
976                 opt.color = 0;
977                 opt.name_only = 1;
978                 opt.null_following_name = 1;
979                 opt.output_priv = &path_list;
980                 opt.output = append_path;
981                 string_list_append(&path_list, show_in_pager);
982                 use_threads = 0;
983         }
985         if (!opt.pattern_list)
986                 die(_("no pattern given."));
987         if (!opt.fixed && opt.ignore_case)
988                 opt.regflags |= REG_ICASE;
990         compile_grep_patterns(&opt);
992         /* Check revs and then paths */
993         for (i = 0; i < argc; i++) {
994                 const char *arg = argv[i];
995                 unsigned char sha1[20];
996                 /* Is it a rev? */
997                 if (!get_sha1(arg, sha1)) {
998                         struct object *object = parse_object(sha1);
999                         if (!object)
1000                                 die(_("bad object %s"), arg);
1001                         add_object_array(object, arg, &list);
1002                         continue;
1003                 }
1004                 if (!strcmp(arg, "--")) {
1005                         i++;
1006                         seen_dashdash = 1;
1007                 }
1008                 break;
1009         }
1011 #ifndef NO_PTHREADS
1012         if (list.nr || cached || online_cpus() == 1)
1013                 use_threads = 0;
1014 #else
1015         use_threads = 0;
1016 #endif
1018 #ifndef NO_PTHREADS
1019         if (use_threads) {
1020                 if (opt.pre_context || opt.post_context || opt.file_break ||
1021                     opt.funcbody)
1022                         skip_first_line = 1;
1023                 start_threads(&opt);
1024         }
1025 #endif
1027         /* The rest are paths */
1028         if (!seen_dashdash) {
1029                 int j;
1030                 for (j = i; j < argc; j++)
1031                         verify_filename(prefix, argv[j]);
1032         }
1034         paths = get_pathspec(prefix, argv + i);
1035         init_pathspec(&pathspec, paths);
1036         pathspec.max_depth = opt.max_depth;
1037         pathspec.recursive = 1;
1039         if (show_in_pager && (cached || list.nr))
1040                 die(_("--open-files-in-pager only works on the worktree"));
1042         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1043                 const char *pager = path_list.items[0].string;
1044                 int len = strlen(pager);
1046                 if (len > 4 && is_dir_sep(pager[len - 5]))
1047                         pager += len - 4;
1049                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1050                         struct strbuf buf = STRBUF_INIT;
1051                         strbuf_addf(&buf, "+/%s%s",
1052                                         strcmp("less", pager) ? "" : "*",
1053                                         opt.pattern_list->pattern);
1054                         string_list_append(&path_list, buf.buf);
1055                         strbuf_detach(&buf, NULL);
1056                 }
1057         }
1059         if (!show_in_pager)
1060                 setup_pager();
1062         if (!use_index && (untracked || cached))
1063                 die(_("--cached or --untracked cannot be used with --no-index."));
1065         if (!use_index || untracked) {
1066                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1067                 if (list.nr)
1068                         die(_("--no-index or --untracked cannot be used with revs."));
1069                 hit = grep_directory(&opt, &pathspec, use_exclude);
1070         } else if (0 <= opt_exclude) {
1071                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1072         } else if (!list.nr) {
1073                 if (!cached)
1074                         setup_work_tree();
1076                 hit = grep_cache(&opt, &pathspec, cached);
1077         } else {
1078                 if (cached)
1079                         die(_("both --cached and trees are given."));
1080                 hit = grep_objects(&opt, &pathspec, &list);
1081         }
1083         if (use_threads)
1084                 hit |= wait_all();
1085         if (hit && show_in_pager)
1086                 run_pager(&opt, prefix);
1087         free_grep_patterns(&opt);
1088         return !hit;