Code

Merge branch 'dp/i18n-libcharset'
[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 /* Used to serialize calls to read_sha1_file. */
89 static pthread_mutex_t read_sha1_mutex;
91 static inline void read_sha1_lock(void)
92 {
93         if (use_threads)
94                 pthread_mutex_lock(&read_sha1_mutex);
95 }
97 static inline void read_sha1_unlock(void)
98 {
99         if (use_threads)
100                 pthread_mutex_unlock(&read_sha1_mutex);
103 /* Signalled when a new work_item is added to todo. */
104 static pthread_cond_t cond_add;
106 /* Signalled when the result from one work_item is written to
107  * stdout.
108  */
109 static pthread_cond_t cond_write;
111 /* Signalled when we are finished with everything. */
112 static pthread_cond_t cond_result;
114 static int skip_first_line;
116 static void add_work(enum work_type type, char *name, void *id)
118         grep_lock();
120         while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
121                 pthread_cond_wait(&cond_write, &grep_mutex);
122         }
124         todo[todo_end].type = type;
125         todo[todo_end].name = name;
126         todo[todo_end].identifier = id;
127         todo[todo_end].done = 0;
128         strbuf_reset(&todo[todo_end].out);
129         todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
131         pthread_cond_signal(&cond_add);
132         grep_unlock();
135 static struct work_item *get_work(void)
137         struct work_item *ret;
139         grep_lock();
140         while (todo_start == todo_end && !all_work_added) {
141                 pthread_cond_wait(&cond_add, &grep_mutex);
142         }
144         if (todo_start == todo_end && all_work_added) {
145                 ret = NULL;
146         } else {
147                 ret = &todo[todo_start];
148                 todo_start = (todo_start + 1) % ARRAY_SIZE(todo);
149         }
150         grep_unlock();
151         return ret;
154 static void grep_sha1_async(struct grep_opt *opt, char *name,
155                             const unsigned char *sha1)
157         unsigned char *s;
158         s = xmalloc(20);
159         memcpy(s, sha1, 20);
160         add_work(WORK_SHA1, name, s);
163 static void grep_file_async(struct grep_opt *opt, char *name,
164                             const char *filename)
166         add_work(WORK_FILE, name, xstrdup(filename));
169 static void work_done(struct work_item *w)
171         int old_done;
173         grep_lock();
174         w->done = 1;
175         old_done = todo_done;
176         for(; todo[todo_done].done && todo_done != todo_start;
177             todo_done = (todo_done+1) % ARRAY_SIZE(todo)) {
178                 w = &todo[todo_done];
179                 if (w->out.len) {
180                         const char *p = w->out.buf;
181                         size_t len = w->out.len;
183                         /* Skip the leading hunk mark of the first file. */
184                         if (skip_first_line) {
185                                 while (len) {
186                                         len--;
187                                         if (*p++ == '\n')
188                                                 break;
189                                 }
190                                 skip_first_line = 0;
191                         }
193                         write_or_die(1, p, len);
194                 }
195                 free(w->name);
196                 free(w->identifier);
197         }
199         if (old_done != todo_done)
200                 pthread_cond_signal(&cond_write);
202         if (all_work_added && todo_done == todo_end)
203                 pthread_cond_signal(&cond_result);
205         grep_unlock();
208 static void *run(void *arg)
210         int hit = 0;
211         struct grep_opt *opt = arg;
213         while (1) {
214                 struct work_item *w = get_work();
215                 if (!w)
216                         break;
218                 opt->output_priv = w;
219                 if (w->type == WORK_SHA1) {
220                         unsigned long sz;
221                         void* data = load_sha1(w->identifier, &sz, w->name);
223                         if (data) {
224                                 hit |= grep_buffer(opt, w->name, data, sz);
225                                 free(data);
226                         }
227                 } else if (w->type == WORK_FILE) {
228                         size_t sz;
229                         void* data = load_file(w->identifier, &sz);
230                         if (data) {
231                                 hit |= grep_buffer(opt, w->name, data, sz);
232                                 free(data);
233                         }
234                 } else {
235                         assert(0);
236                 }
238                 work_done(w);
239         }
240         free_grep_patterns(arg);
241         free(arg);
243         return (void*) (intptr_t) hit;
246 static void strbuf_out(struct grep_opt *opt, const void *buf, size_t size)
248         struct work_item *w = opt->output_priv;
249         strbuf_add(&w->out, buf, size);
252 static void start_threads(struct grep_opt *opt)
254         int i;
256         pthread_mutex_init(&grep_mutex, NULL);
257         pthread_mutex_init(&read_sha1_mutex, NULL);
258         pthread_mutex_init(&grep_attr_mutex, NULL);
259         pthread_cond_init(&cond_add, NULL);
260         pthread_cond_init(&cond_write, NULL);
261         pthread_cond_init(&cond_result, NULL);
263         for (i = 0; i < ARRAY_SIZE(todo); i++) {
264                 strbuf_init(&todo[i].out, 0);
265         }
267         for (i = 0; i < ARRAY_SIZE(threads); i++) {
268                 int err;
269                 struct grep_opt *o = grep_opt_dup(opt);
270                 o->output = strbuf_out;
271                 compile_grep_patterns(o);
272                 err = pthread_create(&threads[i], NULL, run, o);
274                 if (err)
275                         die(_("grep: failed to create thread: %s"),
276                             strerror(err));
277         }
280 static int wait_all(void)
282         int hit = 0;
283         int i;
285         grep_lock();
286         all_work_added = 1;
288         /* Wait until all work is done. */
289         while (todo_done != todo_end)
290                 pthread_cond_wait(&cond_result, &grep_mutex);
292         /* Wake up all the consumer threads so they can see that there
293          * is no more work to do.
294          */
295         pthread_cond_broadcast(&cond_add);
296         grep_unlock();
298         for (i = 0; i < ARRAY_SIZE(threads); i++) {
299                 void *h;
300                 pthread_join(threads[i], &h);
301                 hit |= (int) (intptr_t) h;
302         }
304         pthread_mutex_destroy(&grep_mutex);
305         pthread_mutex_destroy(&read_sha1_mutex);
306         pthread_mutex_destroy(&grep_attr_mutex);
307         pthread_cond_destroy(&cond_add);
308         pthread_cond_destroy(&cond_write);
309         pthread_cond_destroy(&cond_result);
311         return hit;
313 #else /* !NO_PTHREADS */
314 #define read_sha1_lock()
315 #define read_sha1_unlock()
317 static int wait_all(void)
319         return 0;
321 #endif
323 static int grep_config(const char *var, const char *value, void *cb)
325         struct grep_opt *opt = cb;
326         char *color = NULL;
328         if (userdiff_config(var, value) < 0)
329                 return -1;
331         if (!strcmp(var, "grep.extendedregexp")) {
332                 if (git_config_bool(var, value))
333                         opt->regflags |= REG_EXTENDED;
334                 else
335                         opt->regflags &= ~REG_EXTENDED;
336                 return 0;
337         }
339         if (!strcmp(var, "grep.linenumber")) {
340                 opt->linenum = git_config_bool(var, value);
341                 return 0;
342         }
344         if (!strcmp(var, "color.grep"))
345                 opt->color = git_config_colorbool(var, value);
346         else if (!strcmp(var, "color.grep.context"))
347                 color = opt->color_context;
348         else if (!strcmp(var, "color.grep.filename"))
349                 color = opt->color_filename;
350         else if (!strcmp(var, "color.grep.function"))
351                 color = opt->color_function;
352         else if (!strcmp(var, "color.grep.linenumber"))
353                 color = opt->color_lineno;
354         else if (!strcmp(var, "color.grep.match"))
355                 color = opt->color_match;
356         else if (!strcmp(var, "color.grep.selected"))
357                 color = opt->color_selected;
358         else if (!strcmp(var, "color.grep.separator"))
359                 color = opt->color_sep;
360         else
361                 return git_color_default_config(var, value, cb);
362         if (color) {
363                 if (!value)
364                         return config_error_nonbool(var);
365                 color_parse(value, var, color);
366         }
367         return 0;
370 static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
372         void *data;
374         read_sha1_lock();
375         data = read_sha1_file(sha1, type, size);
376         read_sha1_unlock();
377         return data;
380 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
381                        const char *name)
383         enum object_type type;
384         void *data = lock_and_read_sha1_file(sha1, &type, size);
386         if (!data)
387                 error(_("'%s': unable to read %s"), name, sha1_to_hex(sha1));
389         return data;
392 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1,
393                      const char *filename, int tree_name_len)
395         struct strbuf pathbuf = STRBUF_INIT;
396         char *name;
398         if (opt->relative && opt->prefix_length) {
399                 quote_path_relative(filename + tree_name_len, -1, &pathbuf,
400                                     opt->prefix);
401                 strbuf_insert(&pathbuf, 0, filename, tree_name_len);
402         } else {
403                 strbuf_addstr(&pathbuf, filename);
404         }
406         name = strbuf_detach(&pathbuf, NULL);
408 #ifndef NO_PTHREADS
409         if (use_threads) {
410                 grep_sha1_async(opt, name, sha1);
411                 return 0;
412         } else
413 #endif
414         {
415                 int hit;
416                 unsigned long sz;
417                 void *data = load_sha1(sha1, &sz, name);
418                 if (!data)
419                         hit = 0;
420                 else
421                         hit = grep_buffer(opt, name, data, sz);
423                 free(data);
424                 free(name);
425                 return hit;
426         }
429 static void *load_file(const char *filename, size_t *sz)
431         struct stat st;
432         char *data;
433         int i;
435         if (lstat(filename, &st) < 0) {
436         err_ret:
437                 if (errno != ENOENT)
438                         error(_("'%s': %s"), filename, strerror(errno));
439                 return NULL;
440         }
441         if (!S_ISREG(st.st_mode))
442                 return NULL;
443         *sz = xsize_t(st.st_size);
444         i = open(filename, O_RDONLY);
445         if (i < 0)
446                 goto err_ret;
447         data = xmalloc(*sz + 1);
448         if (st.st_size != read_in_full(i, data, *sz)) {
449                 error(_("'%s': short read %s"), filename, strerror(errno));
450                 close(i);
451                 free(data);
452                 return NULL;
453         }
454         close(i);
455         data[*sz] = 0;
456         return data;
459 static int grep_file(struct grep_opt *opt, const char *filename)
461         struct strbuf buf = STRBUF_INIT;
462         char *name;
464         if (opt->relative && opt->prefix_length)
465                 quote_path_relative(filename, -1, &buf, opt->prefix);
466         else
467                 strbuf_addstr(&buf, filename);
468         name = strbuf_detach(&buf, NULL);
470 #ifndef NO_PTHREADS
471         if (use_threads) {
472                 grep_file_async(opt, name, filename);
473                 return 0;
474         } else
475 #endif
476         {
477                 int hit;
478                 size_t sz;
479                 void *data = load_file(filename, &sz);
480                 if (!data)
481                         hit = 0;
482                 else
483                         hit = grep_buffer(opt, name, data, sz);
485                 free(data);
486                 free(name);
487                 return hit;
488         }
491 static void append_path(struct grep_opt *opt, const void *data, size_t len)
493         struct string_list *path_list = opt->output_priv;
495         if (len == 1 && *(const char *)data == '\0')
496                 return;
497         string_list_append(path_list, xstrndup(data, len));
500 static void run_pager(struct grep_opt *opt, const char *prefix)
502         struct string_list *path_list = opt->output_priv;
503         const char **argv = xmalloc(sizeof(const char *) * (path_list->nr + 1));
504         int i, status;
506         for (i = 0; i < path_list->nr; i++)
507                 argv[i] = path_list->items[i].string;
508         argv[path_list->nr] = NULL;
510         if (prefix && chdir(prefix))
511                 die(_("Failed to chdir: %s"), prefix);
512         status = run_command_v_opt(argv, RUN_USING_SHELL);
513         if (status)
514                 exit(status);
515         free(argv);
518 static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int cached)
520         int hit = 0;
521         int nr;
522         read_cache();
524         for (nr = 0; nr < active_nr; nr++) {
525                 struct cache_entry *ce = active_cache[nr];
526                 if (!S_ISREG(ce->ce_mode))
527                         continue;
528                 if (!match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, NULL))
529                         continue;
530                 /*
531                  * If CE_VALID is on, we assume worktree file and its cache entry
532                  * are identical, even if worktree file has been modified, so use
533                  * cache version instead
534                  */
535                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
536                         if (ce_stage(ce))
537                                 continue;
538                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
539                 }
540                 else
541                         hit |= grep_file(opt, ce->name);
542                 if (ce_stage(ce)) {
543                         do {
544                                 nr++;
545                         } while (nr < active_nr &&
546                                  !strcmp(ce->name, active_cache[nr]->name));
547                         nr--; /* compensate for loop control */
548                 }
549                 if (hit && opt->status_only)
550                         break;
551         }
552         return hit;
555 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
556                      struct tree_desc *tree, struct strbuf *base, int tn_len)
558         int hit = 0;
559         enum interesting match = entry_not_interesting;
560         struct name_entry entry;
561         int old_baselen = base->len;
563         while (tree_entry(tree, &entry)) {
564                 int te_len = tree_entry_len(&entry);
566                 if (match != all_entries_interesting) {
567                         match = tree_entry_interesting(&entry, base, tn_len, pathspec);
568                         if (match == all_entries_not_interesting)
569                                 break;
570                         if (match == entry_not_interesting)
571                                 continue;
572                 }
574                 strbuf_add(base, entry.path, te_len);
576                 if (S_ISREG(entry.mode)) {
577                         hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
578                 }
579                 else if (S_ISDIR(entry.mode)) {
580                         enum object_type type;
581                         struct tree_desc sub;
582                         void *data;
583                         unsigned long size;
585                         data = lock_and_read_sha1_file(entry.sha1, &type, &size);
586                         if (!data)
587                                 die(_("unable to read tree (%s)"),
588                                     sha1_to_hex(entry.sha1));
590                         strbuf_addch(base, '/');
591                         init_tree_desc(&sub, data, size);
592                         hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
593                         free(data);
594                 }
595                 strbuf_setlen(base, old_baselen);
597                 if (hit && opt->status_only)
598                         break;
599         }
600         return hit;
603 static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
604                        struct object *obj, const char *name)
606         if (obj->type == OBJ_BLOB)
607                 return grep_sha1(opt, obj->sha1, name, 0);
608         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
609                 struct tree_desc tree;
610                 void *data;
611                 unsigned long size;
612                 struct strbuf base;
613                 int hit, len;
615                 read_sha1_lock();
616                 data = read_object_with_reference(obj->sha1, tree_type,
617                                                   &size, NULL);
618                 read_sha1_unlock();
620                 if (!data)
621                         die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));
623                 len = name ? strlen(name) : 0;
624                 strbuf_init(&base, PATH_MAX + len + 1);
625                 if (len) {
626                         strbuf_add(&base, name, len);
627                         strbuf_addch(&base, ':');
628                 }
629                 init_tree_desc(&tree, data, size);
630                 hit = grep_tree(opt, pathspec, &tree, &base, base.len);
631                 strbuf_release(&base);
632                 free(data);
633                 return hit;
634         }
635         die(_("unable to grep from object of type %s"), typename(obj->type));
638 static int grep_objects(struct grep_opt *opt, const struct pathspec *pathspec,
639                         const struct object_array *list)
641         unsigned int i;
642         int hit = 0;
643         const unsigned int nr = list->nr;
645         for (i = 0; i < nr; i++) {
646                 struct object *real_obj;
647                 real_obj = deref_tag(list->objects[i].item, NULL, 0);
648                 if (grep_object(opt, pathspec, real_obj, list->objects[i].name)) {
649                         hit = 1;
650                         if (opt->status_only)
651                                 break;
652                 }
653         }
654         return hit;
657 static int grep_directory(struct grep_opt *opt, const struct pathspec *pathspec,
658                           int exc_std)
660         struct dir_struct dir;
661         int i, hit = 0;
663         memset(&dir, 0, sizeof(dir));
664         if (exc_std)
665                 setup_standard_excludes(&dir);
667         fill_directory(&dir, pathspec->raw);
668         for (i = 0; i < dir.nr; i++) {
669                 const char *name = dir.entries[i]->name;
670                 int namelen = strlen(name);
671                 if (!match_pathspec_depth(pathspec, name, namelen, 0, NULL))
672                         continue;
673                 hit |= grep_file(opt, dir.entries[i]->name);
674                 if (hit && opt->status_only)
675                         break;
676         }
677         return hit;
680 static int context_callback(const struct option *opt, const char *arg,
681                             int unset)
683         struct grep_opt *grep_opt = opt->value;
684         int value;
685         const char *endp;
687         if (unset) {
688                 grep_opt->pre_context = grep_opt->post_context = 0;
689                 return 0;
690         }
691         value = strtol(arg, (char **)&endp, 10);
692         if (*endp) {
693                 return error(_("switch `%c' expects a numerical value"),
694                              opt->short_name);
695         }
696         grep_opt->pre_context = grep_opt->post_context = value;
697         return 0;
700 static int file_callback(const struct option *opt, const char *arg, int unset)
702         struct grep_opt *grep_opt = opt->value;
703         int from_stdin = !strcmp(arg, "-");
704         FILE *patterns;
705         int lno = 0;
706         struct strbuf sb = STRBUF_INIT;
708         patterns = from_stdin ? stdin : fopen(arg, "r");
709         if (!patterns)
710                 die_errno(_("cannot open '%s'"), arg);
711         while (strbuf_getline(&sb, patterns, '\n') == 0) {
712                 char *s;
713                 size_t len;
715                 /* ignore empty line like grep does */
716                 if (sb.len == 0)
717                         continue;
719                 s = strbuf_detach(&sb, &len);
720                 append_grep_pat(grep_opt, s, len, arg, ++lno, GREP_PATTERN);
721         }
722         if (!from_stdin)
723                 fclose(patterns);
724         strbuf_release(&sb);
725         return 0;
728 static int not_callback(const struct option *opt, const char *arg, int unset)
730         struct grep_opt *grep_opt = opt->value;
731         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
732         return 0;
735 static int and_callback(const struct option *opt, const char *arg, int unset)
737         struct grep_opt *grep_opt = opt->value;
738         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
739         return 0;
742 static int open_callback(const struct option *opt, const char *arg, int unset)
744         struct grep_opt *grep_opt = opt->value;
745         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
746         return 0;
749 static int close_callback(const struct option *opt, const char *arg, int unset)
751         struct grep_opt *grep_opt = opt->value;
752         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
753         return 0;
756 static int pattern_callback(const struct option *opt, const char *arg,
757                             int unset)
759         struct grep_opt *grep_opt = opt->value;
760         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
761         return 0;
764 static int help_callback(const struct option *opt, const char *arg, int unset)
766         return -1;
769 int cmd_grep(int argc, const char **argv, const char *prefix)
771         int hit = 0;
772         int cached = 0, untracked = 0, opt_exclude = -1;
773         int seen_dashdash = 0;
774         int external_grep_allowed__ignored;
775         const char *show_in_pager = NULL, *default_pager = "dummy";
776         struct grep_opt opt;
777         struct object_array list = OBJECT_ARRAY_INIT;
778         const char **paths = NULL;
779         struct pathspec pathspec;
780         struct string_list path_list = STRING_LIST_INIT_NODUP;
781         int i;
782         int dummy;
783         int use_index = 1;
784         enum {
785                 pattern_type_unspecified = 0,
786                 pattern_type_bre,
787                 pattern_type_ere,
788                 pattern_type_fixed,
789                 pattern_type_pcre,
790         };
791         int pattern_type = pattern_type_unspecified;
793         struct option options[] = {
794                 OPT_BOOLEAN(0, "cached", &cached,
795                         "search in index instead of in the work tree"),
796                 { OPTION_BOOLEAN, 0, "index", &use_index, NULL,
797                         "finds in contents not managed by git",
798                         PARSE_OPT_NOARG | PARSE_OPT_NEGHELP },
799                 OPT_BOOLEAN(0, "untracked", &untracked,
800                         "search in both tracked and untracked files"),
801                 OPT_SET_INT(0, "exclude-standard", &opt_exclude,
802                             "search also in ignored files", 1),
803                 OPT_GROUP(""),
804                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
805                         "show non-matching lines"),
806                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
807                         "case insensitive matching"),
808                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
809                         "match patterns only at word boundaries"),
810                 OPT_SET_INT('a', "text", &opt.binary,
811                         "process binary files as text", GREP_BINARY_TEXT),
812                 OPT_SET_INT('I', NULL, &opt.binary,
813                         "don't match patterns in binary files",
814                         GREP_BINARY_NOMATCH),
815                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
816                         "descend at most <depth> levels", PARSE_OPT_NONEG,
817                         NULL, 1 },
818                 OPT_GROUP(""),
819                 OPT_SET_INT('E', "extended-regexp", &pattern_type,
820                             "use extended POSIX regular expressions",
821                             pattern_type_ere),
822                 OPT_SET_INT('G', "basic-regexp", &pattern_type,
823                             "use basic POSIX regular expressions (default)",
824                             pattern_type_bre),
825                 OPT_SET_INT('F', "fixed-strings", &pattern_type,
826                             "interpret patterns as fixed strings",
827                             pattern_type_fixed),
828                 OPT_SET_INT('P', "perl-regexp", &pattern_type,
829                             "use Perl-compatible regular expressions",
830                             pattern_type_pcre),
831                 OPT_GROUP(""),
832                 OPT_BOOLEAN('n', "line-number", &opt.linenum, "show line numbers"),
833                 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
834                 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
835                 OPT_NEGBIT(0, "full-name", &opt.relative,
836                         "show filenames relative to top directory", 1),
837                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
838                         "show only filenames instead of matching lines"),
839                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
840                         "synonym for --files-with-matches"),
841                 OPT_BOOLEAN('L', "files-without-match",
842                         &opt.unmatch_name_only,
843                         "show only the names of files without match"),
844                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
845                         "print NUL after filenames"),
846                 OPT_BOOLEAN('c', "count", &opt.count,
847                         "show the number of matches instead of matching lines"),
848                 OPT__COLOR(&opt.color, "highlight matches"),
849                 OPT_BOOLEAN(0, "break", &opt.file_break,
850                         "print empty line between matches from different files"),
851                 OPT_BOOLEAN(0, "heading", &opt.heading,
852                         "show filename only once above matches from same file"),
853                 OPT_GROUP(""),
854                 OPT_CALLBACK('C', "context", &opt, "n",
855                         "show <n> context lines before and after matches",
856                         context_callback),
857                 OPT_INTEGER('B', "before-context", &opt.pre_context,
858                         "show <n> context lines before matches"),
859                 OPT_INTEGER('A', "after-context", &opt.post_context,
860                         "show <n> context lines after matches"),
861                 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
862                         context_callback),
863                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
864                         "show a line with the function name before matches"),
865                 OPT_BOOLEAN('W', "function-context", &opt.funcbody,
866                         "show the surrounding function"),
867                 OPT_GROUP(""),
868                 OPT_CALLBACK('f', NULL, &opt, "file",
869                         "read patterns from file", file_callback),
870                 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
871                         "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
872                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
873                   "combine patterns specified with -e",
874                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
875                 OPT_BOOLEAN(0, "or", &dummy, ""),
876                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
877                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
878                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
879                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
880                   open_callback },
881                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
882                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
883                   close_callback },
884                 OPT__QUIET(&opt.status_only,
885                            "indicate hit with exit status without output"),
886                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
887                         "show only matches from files that match all patterns"),
888                 OPT_GROUP(""),
889                 { OPTION_STRING, 'O', "open-files-in-pager", &show_in_pager,
890                         "pager", "show matching files in the pager",
891                         PARSE_OPT_OPTARG, NULL, (intptr_t)default_pager },
892                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed__ignored,
893                             "allow calling of grep(1) (ignored by this build)"),
894                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
895                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
896                 OPT_END()
897         };
899         /*
900          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
901          * to show usage information and exit.
902          */
903         if (argc == 2 && !strcmp(argv[1], "-h"))
904                 usage_with_options(grep_usage, options);
906         memset(&opt, 0, sizeof(opt));
907         opt.prefix = prefix;
908         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
909         opt.relative = 1;
910         opt.pathname = 1;
911         opt.pattern_tail = &opt.pattern_list;
912         opt.header_tail = &opt.header_list;
913         opt.regflags = REG_NEWLINE;
914         opt.max_depth = -1;
916         strcpy(opt.color_context, "");
917         strcpy(opt.color_filename, "");
918         strcpy(opt.color_function, "");
919         strcpy(opt.color_lineno, "");
920         strcpy(opt.color_match, GIT_COLOR_BOLD_RED);
921         strcpy(opt.color_selected, "");
922         strcpy(opt.color_sep, GIT_COLOR_CYAN);
923         opt.color = -1;
924         git_config(grep_config, &opt);
926         /*
927          * If there is no -- then the paths must exist in the working
928          * tree.  If there is no explicit pattern specified with -e or
929          * -f, we take the first unrecognized non option to be the
930          * pattern, but then what follows it must be zero or more
931          * valid refs up to the -- (if exists), and then existing
932          * paths.  If there is an explicit pattern, then the first
933          * unrecognized non option is the beginning of the refs list
934          * that continues up to the -- (if exists), and then paths.
935          */
936         argc = parse_options(argc, argv, prefix, options, grep_usage,
937                              PARSE_OPT_KEEP_DASHDASH |
938                              PARSE_OPT_STOP_AT_NON_OPTION |
939                              PARSE_OPT_NO_INTERNAL_HELP);
940         switch (pattern_type) {
941         case pattern_type_fixed:
942                 opt.fixed = 1;
943                 opt.pcre = 0;
944                 break;
945         case pattern_type_bre:
946                 opt.fixed = 0;
947                 opt.pcre = 0;
948                 opt.regflags &= ~REG_EXTENDED;
949                 break;
950         case pattern_type_ere:
951                 opt.fixed = 0;
952                 opt.pcre = 0;
953                 opt.regflags |= REG_EXTENDED;
954                 break;
955         case pattern_type_pcre:
956                 opt.fixed = 0;
957                 opt.pcre = 1;
958                 break;
959         default:
960                 break; /* nothing */
961         }
963         if (use_index && !startup_info->have_repository)
964                 /* die the same way as if we did it at the beginning */
965                 setup_git_directory();
967         /*
968          * skip a -- separator; we know it cannot be
969          * separating revisions from pathnames if
970          * we haven't even had any patterns yet
971          */
972         if (argc > 0 && !opt.pattern_list && !strcmp(argv[0], "--")) {
973                 argv++;
974                 argc--;
975         }
977         /* First unrecognized non-option token */
978         if (argc > 0 && !opt.pattern_list) {
979                 append_grep_pattern(&opt, argv[0], "command line", 0,
980                                     GREP_PATTERN);
981                 argv++;
982                 argc--;
983         }
985         if (show_in_pager == default_pager)
986                 show_in_pager = git_pager(1);
987         if (show_in_pager) {
988                 opt.color = 0;
989                 opt.name_only = 1;
990                 opt.null_following_name = 1;
991                 opt.output_priv = &path_list;
992                 opt.output = append_path;
993                 string_list_append(&path_list, show_in_pager);
994                 use_threads = 0;
995         }
997         if (!opt.pattern_list)
998                 die(_("no pattern given."));
999         if (!opt.fixed && opt.ignore_case)
1000                 opt.regflags |= REG_ICASE;
1002         compile_grep_patterns(&opt);
1004         /* Check revs and then paths */
1005         for (i = 0; i < argc; i++) {
1006                 const char *arg = argv[i];
1007                 unsigned char sha1[20];
1008                 /* Is it a rev? */
1009                 if (!get_sha1(arg, sha1)) {
1010                         struct object *object = parse_object(sha1);
1011                         if (!object)
1012                                 die(_("bad object %s"), arg);
1013                         add_object_array(object, arg, &list);
1014                         continue;
1015                 }
1016                 if (!strcmp(arg, "--")) {
1017                         i++;
1018                         seen_dashdash = 1;
1019                 }
1020                 break;
1021         }
1023 #ifndef NO_PTHREADS
1024         if (list.nr || cached || online_cpus() == 1)
1025                 use_threads = 0;
1026 #else
1027         use_threads = 0;
1028 #endif
1030         opt.use_threads = use_threads;
1032 #ifndef NO_PTHREADS
1033         if (use_threads) {
1034                 if (!(opt.name_only || opt.unmatch_name_only || opt.count)
1035                     && (opt.pre_context || opt.post_context ||
1036                         opt.file_break || opt.funcbody))
1037                         skip_first_line = 1;
1038                 start_threads(&opt);
1039         }
1040 #endif
1042         /* The rest are paths */
1043         if (!seen_dashdash) {
1044                 int j;
1045                 for (j = i; j < argc; j++)
1046                         verify_filename(prefix, argv[j]);
1047         }
1049         paths = get_pathspec(prefix, argv + i);
1050         init_pathspec(&pathspec, paths);
1051         pathspec.max_depth = opt.max_depth;
1052         pathspec.recursive = 1;
1054         if (show_in_pager && (cached || list.nr))
1055                 die(_("--open-files-in-pager only works on the worktree"));
1057         if (show_in_pager && opt.pattern_list && !opt.pattern_list->next) {
1058                 const char *pager = path_list.items[0].string;
1059                 int len = strlen(pager);
1061                 if (len > 4 && is_dir_sep(pager[len - 5]))
1062                         pager += len - 4;
1064                 if (!strcmp("less", pager) || !strcmp("vi", pager)) {
1065                         struct strbuf buf = STRBUF_INIT;
1066                         strbuf_addf(&buf, "+/%s%s",
1067                                         strcmp("less", pager) ? "" : "*",
1068                                         opt.pattern_list->pattern);
1069                         string_list_append(&path_list, buf.buf);
1070                         strbuf_detach(&buf, NULL);
1071                 }
1072         }
1074         if (!show_in_pager)
1075                 setup_pager();
1077         if (!use_index && (untracked || cached))
1078                 die(_("--cached or --untracked cannot be used with --no-index."));
1080         if (!use_index || untracked) {
1081                 int use_exclude = (opt_exclude < 0) ? use_index : !!opt_exclude;
1082                 if (list.nr)
1083                         die(_("--no-index or --untracked cannot be used with revs."));
1084                 hit = grep_directory(&opt, &pathspec, use_exclude);
1085         } else if (0 <= opt_exclude) {
1086                 die(_("--[no-]exclude-standard cannot be used for tracked contents."));
1087         } else if (!list.nr) {
1088                 if (!cached)
1089                         setup_work_tree();
1091                 hit = grep_cache(&opt, &pathspec, cached);
1092         } else {
1093                 if (cached)
1094                         die(_("both --cached and trees are given."));
1095                 hit = grep_objects(&opt, &pathspec, &list);
1096         }
1098         if (use_threads)
1099                 hit |= wait_all();
1100         if (hit && show_in_pager)
1101                 run_pager(&opt, prefix);
1102         free_grep_patterns(&opt);
1103         return !hit;