73fc922c4995369c0ca86c01200e2a0ea39161ab
[git/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 "grep.h"
15
16 #ifndef NO_EXTERNAL_GREP
17 #ifdef __unix__
18 #define NO_EXTERNAL_GREP 0
19 #else
20 #define NO_EXTERNAL_GREP 1
21 #endif
22 #endif
23
24 static char const * const grep_usage[] = {
25 "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
26 NULL
27 };
28
29 static int grep_config(const char *var, const char *value, void *cb)
30 {
31 struct grep_opt *opt = cb;
32
33 if (!strcmp(var, "color.grep")) {
34 opt->color = git_config_colorbool(var, value, -1);
35 return 0;
36 }
37 if (!strcmp(var, "color.grep.external"))
38 return git_config_string(&(opt->color_external), var, value);
39 if (!strcmp(var, "color.grep.match")) {
40 if (!value)
41 return config_error_nonbool(var);
42 color_parse(value, var, opt->color_match);
43 return 0;
44 }
45 return git_color_default_config(var, value, cb);
46 }
47
48 /*
49 * git grep pathspecs are somewhat different from diff-tree pathspecs;
50 * pathname wildcards are allowed.
51 */
52 static int pathspec_matches(const char **paths, const char *name)
53 {
54 int namelen, i;
55 if (!paths || !*paths)
56 return 1;
57 namelen = strlen(name);
58 for (i = 0; paths[i]; i++) {
59 const char *match = paths[i];
60 int matchlen = strlen(match);
61 const char *cp, *meta;
62
63 if (!matchlen ||
64 ((matchlen <= namelen) &&
65 !strncmp(name, match, matchlen) &&
66 (match[matchlen-1] == '/' ||
67 name[matchlen] == '\0' || name[matchlen] == '/')))
68 return 1;
69 if (!fnmatch(match, name, 0))
70 return 1;
71 if (name[namelen-1] != '/')
72 continue;
73
74 /* We are being asked if the directory ("name") is worth
75 * descending into.
76 *
77 * Find the longest leading directory name that does
78 * not have metacharacter in the pathspec; the name
79 * we are looking at must overlap with that directory.
80 */
81 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
82 char ch = *cp;
83 if (ch == '*' || ch == '[' || ch == '?') {
84 meta = cp;
85 break;
86 }
87 }
88 if (!meta)
89 meta = cp; /* fully literal */
90
91 if (namelen <= meta - match) {
92 /* Looking at "Documentation/" and
93 * the pattern says "Documentation/howto/", or
94 * "Documentation/diff*.txt". The name we
95 * have should match prefix.
96 */
97 if (!memcmp(match, name, namelen))
98 return 1;
99 continue;
100 }
101
102 if (meta - match < namelen) {
103 /* Looking at "Documentation/howto/" and
104 * the pattern says "Documentation/h*";
105 * match up to "Do.../h"; this avoids descending
106 * into "Documentation/technical/".
107 */
108 if (!memcmp(match, name, meta - match))
109 return 1;
110 continue;
111 }
112 }
113 return 0;
114 }
115
116 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
117 {
118 unsigned long size;
119 char *data;
120 enum object_type type;
121 char *to_free = NULL;
122 int hit;
123
124 data = read_sha1_file(sha1, &type, &size);
125 if (!data) {
126 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
127 return 0;
128 }
129 if (opt->relative && opt->prefix_length) {
130 static char name_buf[PATH_MAX];
131 char *cp;
132 int name_len = strlen(name) - opt->prefix_length + 1;
133
134 if (!tree_name_len)
135 name += opt->prefix_length;
136 else {
137 if (ARRAY_SIZE(name_buf) <= name_len)
138 cp = to_free = xmalloc(name_len);
139 else
140 cp = name_buf;
141 memcpy(cp, name, tree_name_len);
142 strcpy(cp + tree_name_len,
143 name + tree_name_len + opt->prefix_length);
144 name = cp;
145 }
146 }
147 hit = grep_buffer(opt, name, data, size);
148 free(data);
149 free(to_free);
150 return hit;
151 }
152
153 static int grep_file(struct grep_opt *opt, const char *filename)
154 {
155 struct stat st;
156 int i;
157 char *data;
158 size_t sz;
159
160 if (lstat(filename, &st) < 0) {
161 err_ret:
162 if (errno != ENOENT)
163 error("'%s': %s", filename, strerror(errno));
164 return 0;
165 }
166 if (!st.st_size)
167 return 0; /* empty file -- no grep hit */
168 if (!S_ISREG(st.st_mode))
169 return 0;
170 sz = xsize_t(st.st_size);
171 i = open(filename, O_RDONLY);
172 if (i < 0)
173 goto err_ret;
174 data = xmalloc(sz + 1);
175 if (st.st_size != read_in_full(i, data, sz)) {
176 error("'%s': short read %s", filename, strerror(errno));
177 close(i);
178 free(data);
179 return 0;
180 }
181 close(i);
182 if (opt->relative && opt->prefix_length)
183 filename += opt->prefix_length;
184 i = grep_buffer(opt, filename, data, sz);
185 free(data);
186 return i;
187 }
188
189 #if !NO_EXTERNAL_GREP
190 static int exec_grep(int argc, const char **argv)
191 {
192 pid_t pid;
193 int status;
194
195 argv[argc] = NULL;
196 pid = fork();
197 if (pid < 0)
198 return pid;
199 if (!pid) {
200 execvp("grep", (char **) argv);
201 exit(255);
202 }
203 while (waitpid(pid, &status, 0) < 0) {
204 if (errno == EINTR)
205 continue;
206 return -1;
207 }
208 if (WIFEXITED(status)) {
209 if (!WEXITSTATUS(status))
210 return 1;
211 return 0;
212 }
213 return -1;
214 }
215
216 #define MAXARGS 1000
217 #define ARGBUF 4096
218 #define push_arg(a) do { \
219 if (nr < MAXARGS) argv[nr++] = (a); \
220 else die("maximum number of args exceeded"); \
221 } while (0)
222
223 /*
224 * If you send a singleton filename to grep, it does not give
225 * the name of the file. GNU grep has "-H" but we would want
226 * that behaviour in a portable way.
227 *
228 * So we keep two pathnames in argv buffer unsent to grep in
229 * the main loop if we need to do more than one grep.
230 */
231 static int flush_grep(struct grep_opt *opt,
232 int argc, int arg0, const char **argv, int *kept)
233 {
234 int status;
235 int count = argc - arg0;
236 const char *kept_0 = NULL;
237
238 if (count <= 2) {
239 /*
240 * Because we keep at least 2 paths in the call from
241 * the main loop (i.e. kept != NULL), and MAXARGS is
242 * far greater than 2, this usually is a call to
243 * conclude the grep. However, the user could attempt
244 * to overflow the argv buffer by giving too many
245 * options to leave very small number of real
246 * arguments even for the call in the main loop.
247 */
248 if (kept)
249 die("insanely many options to grep");
250
251 /*
252 * If we have two or more paths, we do not have to do
253 * anything special, but we need to push /dev/null to
254 * get "-H" behaviour of GNU grep portably but when we
255 * are not doing "-l" nor "-L" nor "-c".
256 */
257 if (count == 1 &&
258 !opt->name_only &&
259 !opt->unmatch_name_only &&
260 !opt->count) {
261 argv[argc++] = "/dev/null";
262 argv[argc] = NULL;
263 }
264 }
265
266 else if (kept) {
267 /*
268 * Called because we found many paths and haven't finished
269 * iterating over the cache yet. We keep two paths
270 * for the concluding call. argv[argc-2] and argv[argc-1]
271 * has the last two paths, so save the first one away,
272 * replace it with NULL while sending the list to grep,
273 * and recover them after we are done.
274 */
275 *kept = 2;
276 kept_0 = argv[argc-2];
277 argv[argc-2] = NULL;
278 argc -= 2;
279 }
280
281 status = exec_grep(argc, argv);
282
283 if (kept_0) {
284 /*
285 * Then recover them. Now the last arg is beyond the
286 * terminating NULL which is at argc, and the second
287 * from the last is what we saved away in kept_0
288 */
289 argv[arg0++] = kept_0;
290 argv[arg0] = argv[argc+1];
291 }
292 return status;
293 }
294
295 static void grep_add_color(struct strbuf *sb, const char *escape_seq)
296 {
297 size_t orig_len = sb->len;
298
299 while (*escape_seq) {
300 if (*escape_seq == 'm')
301 strbuf_addch(sb, ';');
302 else if (*escape_seq != '\033' && *escape_seq != '[')
303 strbuf_addch(sb, *escape_seq);
304 escape_seq++;
305 }
306 if (sb->len > orig_len && sb->buf[sb->len - 1] == ';')
307 strbuf_setlen(sb, sb->len - 1);
308 }
309
310 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
311 {
312 int i, nr, argc, hit, len, status;
313 const char *argv[MAXARGS+1];
314 char randarg[ARGBUF];
315 char *argptr = randarg;
316 struct grep_pat *p;
317
318 if (opt->extended || (opt->relative && opt->prefix_length))
319 return -1;
320 len = nr = 0;
321 push_arg("grep");
322 if (opt->fixed)
323 push_arg("-F");
324 if (opt->linenum)
325 push_arg("-n");
326 if (!opt->pathname)
327 push_arg("-h");
328 if (opt->regflags & REG_EXTENDED)
329 push_arg("-E");
330 if (opt->regflags & REG_ICASE)
331 push_arg("-i");
332 if (opt->binary == GREP_BINARY_NOMATCH)
333 push_arg("-I");
334 if (opt->word_regexp)
335 push_arg("-w");
336 if (opt->name_only)
337 push_arg("-l");
338 if (opt->unmatch_name_only)
339 push_arg("-L");
340 if (opt->null_following_name)
341 /* in GNU grep git's "-z" translates to "-Z" */
342 push_arg("-Z");
343 if (opt->count)
344 push_arg("-c");
345 if (opt->post_context || opt->pre_context) {
346 if (opt->post_context != opt->pre_context) {
347 if (opt->pre_context) {
348 push_arg("-B");
349 len += snprintf(argptr, sizeof(randarg)-len,
350 "%u", opt->pre_context) + 1;
351 if (sizeof(randarg) <= len)
352 die("maximum length of args exceeded");
353 push_arg(argptr);
354 argptr += len;
355 }
356 if (opt->post_context) {
357 push_arg("-A");
358 len += snprintf(argptr, sizeof(randarg)-len,
359 "%u", opt->post_context) + 1;
360 if (sizeof(randarg) <= len)
361 die("maximum length of args exceeded");
362 push_arg(argptr);
363 argptr += len;
364 }
365 }
366 else {
367 push_arg("-C");
368 len += snprintf(argptr, sizeof(randarg)-len,
369 "%u", opt->post_context) + 1;
370 if (sizeof(randarg) <= len)
371 die("maximum length of args exceeded");
372 push_arg(argptr);
373 argptr += len;
374 }
375 }
376 for (p = opt->pattern_list; p; p = p->next) {
377 push_arg("-e");
378 push_arg(p->pattern);
379 }
380 if (opt->color) {
381 struct strbuf sb = STRBUF_INIT;
382
383 grep_add_color(&sb, opt->color_match);
384 setenv("GREP_COLOR", sb.buf, 1);
385
386 strbuf_reset(&sb);
387 strbuf_addstr(&sb, "mt=");
388 grep_add_color(&sb, opt->color_match);
389 strbuf_addstr(&sb, ":sl=:cx=:fn=:ln=:bn=:se=");
390 setenv("GREP_COLORS", sb.buf, 1);
391
392 strbuf_release(&sb);
393
394 if (opt->color_external && strlen(opt->color_external) > 0)
395 push_arg(opt->color_external);
396 }
397
398 hit = 0;
399 argc = nr;
400 for (i = 0; i < active_nr; i++) {
401 struct cache_entry *ce = active_cache[i];
402 char *name;
403 int kept;
404 if (!S_ISREG(ce->ce_mode))
405 continue;
406 if (!pathspec_matches(paths, ce->name))
407 continue;
408 name = ce->name;
409 if (name[0] == '-') {
410 int len = ce_namelen(ce);
411 name = xmalloc(len + 3);
412 memcpy(name, "./", 2);
413 memcpy(name + 2, ce->name, len + 1);
414 }
415 argv[argc++] = name;
416 if (MAXARGS <= argc) {
417 status = flush_grep(opt, argc, nr, argv, &kept);
418 if (0 < status)
419 hit = 1;
420 argc = nr + kept;
421 }
422 if (ce_stage(ce)) {
423 do {
424 i++;
425 } while (i < active_nr &&
426 !strcmp(ce->name, active_cache[i]->name));
427 i--; /* compensate for loop control */
428 }
429 }
430 if (argc > nr) {
431 status = flush_grep(opt, argc, nr, argv, NULL);
432 if (0 < status)
433 hit = 1;
434 }
435 return hit;
436 }
437 #endif
438
439 static int grep_cache(struct grep_opt *opt, const char **paths, int cached,
440 int external_grep_allowed)
441 {
442 int hit = 0;
443 int nr;
444 read_cache();
445
446 #if !NO_EXTERNAL_GREP
447 /*
448 * Use the external "grep" command for the case where
449 * we grep through the checked-out files. It tends to
450 * be a lot more optimized
451 */
452 if (!cached && external_grep_allowed) {
453 hit = external_grep(opt, paths, cached);
454 if (hit >= 0)
455 return hit;
456 }
457 #endif
458
459 for (nr = 0; nr < active_nr; nr++) {
460 struct cache_entry *ce = active_cache[nr];
461 if (!S_ISREG(ce->ce_mode))
462 continue;
463 if (!pathspec_matches(paths, ce->name))
464 continue;
465 /*
466 * If CE_VALID is on, we assume worktree file and its cache entry
467 * are identical, even if worktree file has been modified, so use
468 * cache version instead
469 */
470 if (cached || (ce->ce_flags & CE_VALID)) {
471 if (ce_stage(ce))
472 continue;
473 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
474 }
475 else
476 hit |= grep_file(opt, ce->name);
477 if (ce_stage(ce)) {
478 do {
479 nr++;
480 } while (nr < active_nr &&
481 !strcmp(ce->name, active_cache[nr]->name));
482 nr--; /* compensate for loop control */
483 }
484 }
485 free_grep_patterns(opt);
486 return hit;
487 }
488
489 static int grep_tree(struct grep_opt *opt, const char **paths,
490 struct tree_desc *tree,
491 const char *tree_name, const char *base)
492 {
493 int len;
494 int hit = 0;
495 struct name_entry entry;
496 char *down;
497 int tn_len = strlen(tree_name);
498 struct strbuf pathbuf;
499
500 strbuf_init(&pathbuf, PATH_MAX + tn_len);
501
502 if (tn_len) {
503 strbuf_add(&pathbuf, tree_name, tn_len);
504 strbuf_addch(&pathbuf, ':');
505 tn_len = pathbuf.len;
506 }
507 strbuf_addstr(&pathbuf, base);
508 len = pathbuf.len;
509
510 while (tree_entry(tree, &entry)) {
511 int te_len = tree_entry_len(entry.path, entry.sha1);
512 pathbuf.len = len;
513 strbuf_add(&pathbuf, entry.path, te_len);
514
515 if (S_ISDIR(entry.mode))
516 /* Match "abc/" against pathspec to
517 * decide if we want to descend into "abc"
518 * directory.
519 */
520 strbuf_addch(&pathbuf, '/');
521
522 down = pathbuf.buf + tn_len;
523 if (!pathspec_matches(paths, down))
524 ;
525 else if (S_ISREG(entry.mode))
526 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
527 else if (S_ISDIR(entry.mode)) {
528 enum object_type type;
529 struct tree_desc sub;
530 void *data;
531 unsigned long size;
532
533 data = read_sha1_file(entry.sha1, &type, &size);
534 if (!data)
535 die("unable to read tree (%s)",
536 sha1_to_hex(entry.sha1));
537 init_tree_desc(&sub, data, size);
538 hit |= grep_tree(opt, paths, &sub, tree_name, down);
539 free(data);
540 }
541 }
542 strbuf_release(&pathbuf);
543 return hit;
544 }
545
546 static int grep_object(struct grep_opt *opt, const char **paths,
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 int hit;
556 data = read_object_with_reference(obj->sha1, tree_type,
557 &size, NULL);
558 if (!data)
559 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
560 init_tree_desc(&tree, data, size);
561 hit = grep_tree(opt, paths, &tree, name, "");
562 free(data);
563 return hit;
564 }
565 die("unable to grep from object of type %s", typename(obj->type));
566 }
567
568 static int context_callback(const struct option *opt, const char *arg,
569 int unset)
570 {
571 struct grep_opt *grep_opt = opt->value;
572 int value;
573 const char *endp;
574
575 if (unset) {
576 grep_opt->pre_context = grep_opt->post_context = 0;
577 return 0;
578 }
579 value = strtol(arg, (char **)&endp, 10);
580 if (*endp) {
581 return error("switch `%c' expects a numerical value",
582 opt->short_name);
583 }
584 grep_opt->pre_context = grep_opt->post_context = value;
585 return 0;
586 }
587
588 static int file_callback(const struct option *opt, const char *arg, int unset)
589 {
590 struct grep_opt *grep_opt = opt->value;
591 FILE *patterns;
592 int lno = 0;
593 struct strbuf sb;
594
595 patterns = fopen(arg, "r");
596 if (!patterns)
597 die("'%s': %s", arg, strerror(errno));
598 while (strbuf_getline(&sb, patterns, '\n') == 0) {
599 /* ignore empty line like grep does */
600 if (sb.len == 0)
601 continue;
602 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
603 ++lno, GREP_PATTERN);
604 }
605 fclose(patterns);
606 strbuf_release(&sb);
607 return 0;
608 }
609
610 static int not_callback(const struct option *opt, const char *arg, int unset)
611 {
612 struct grep_opt *grep_opt = opt->value;
613 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
614 return 0;
615 }
616
617 static int and_callback(const struct option *opt, const char *arg, int unset)
618 {
619 struct grep_opt *grep_opt = opt->value;
620 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
621 return 0;
622 }
623
624 static int open_callback(const struct option *opt, const char *arg, int unset)
625 {
626 struct grep_opt *grep_opt = opt->value;
627 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
628 return 0;
629 }
630
631 static int close_callback(const struct option *opt, const char *arg, int unset)
632 {
633 struct grep_opt *grep_opt = opt->value;
634 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
635 return 0;
636 }
637
638 static int pattern_callback(const struct option *opt, const char *arg,
639 int unset)
640 {
641 struct grep_opt *grep_opt = opt->value;
642 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
643 return 0;
644 }
645
646 static int help_callback(const struct option *opt, const char *arg, int unset)
647 {
648 return -1;
649 }
650
651 int cmd_grep(int argc, const char **argv, const char *prefix)
652 {
653 int hit = 0;
654 int cached = 0;
655 int external_grep_allowed = 1;
656 int seen_dashdash = 0;
657 struct grep_opt opt;
658 struct object_array list = { 0, 0, NULL };
659 const char **paths = NULL;
660 int i;
661 int dummy;
662 struct option options[] = {
663 OPT_BOOLEAN(0, "cached", &cached,
664 "search in index instead of in the work tree"),
665 OPT_GROUP(""),
666 OPT_BOOLEAN('v', "invert-match", &opt.invert,
667 "show non-matching lines"),
668 OPT_BIT('i', "ignore-case", &opt.regflags,
669 "case insensitive matching", REG_ICASE),
670 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
671 "match patterns only at word boundaries"),
672 OPT_SET_INT('a', "text", &opt.binary,
673 "process binary files as text", GREP_BINARY_TEXT),
674 OPT_SET_INT('I', NULL, &opt.binary,
675 "don't match patterns in binary files",
676 GREP_BINARY_NOMATCH),
677 OPT_GROUP(""),
678 OPT_BIT('E', "extended-regexp", &opt.regflags,
679 "use extended POSIX regular expressions", REG_EXTENDED),
680 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
681 "use basic POSIX regular expressions (default)",
682 REG_EXTENDED),
683 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
684 "interpret patterns as fixed strings"),
685 OPT_GROUP(""),
686 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
687 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
688 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
689 OPT_NEGBIT(0, "full-name", &opt.relative,
690 "show filenames relative to top directory", 1),
691 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
692 "show only filenames instead of matching lines"),
693 OPT_BOOLEAN(0, "name-only", &opt.name_only,
694 "synonym for --files-with-matches"),
695 OPT_BOOLEAN('L', "files-without-match",
696 &opt.unmatch_name_only,
697 "show only the names of files without match"),
698 OPT_BOOLEAN('z', "null", &opt.null_following_name,
699 "print NUL after filenames"),
700 OPT_BOOLEAN('c', "count", &opt.count,
701 "show the number of matches instead of matching lines"),
702 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
703 OPT_GROUP(""),
704 OPT_CALLBACK('C', NULL, &opt, "n",
705 "show <n> context lines before and after matches",
706 context_callback),
707 OPT_INTEGER('B', NULL, &opt.pre_context,
708 "show <n> context lines before matches"),
709 OPT_INTEGER('A', NULL, &opt.post_context,
710 "show <n> context lines after matches"),
711 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
712 context_callback),
713 OPT_GROUP(""),
714 OPT_CALLBACK('f', NULL, &opt, "file",
715 "read patterns from file", file_callback),
716 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
717 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
718 { OPTION_CALLBACK, 0, "and", &opt, NULL,
719 "combine patterns specified with -e",
720 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
721 OPT_BOOLEAN(0, "or", &dummy, ""),
722 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
723 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
724 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
725 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
726 open_callback },
727 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
728 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
729 close_callback },
730 OPT_BOOLEAN(0, "all-match", &opt.all_match,
731 "show only matches from files that match all patterns"),
732 OPT_GROUP(""),
733 #if NO_EXTERNAL_GREP
734 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
735 "allow calling of grep(1) (ignored by this build)"),
736 #else
737 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
738 "allow calling of grep(1) (default)"),
739 #endif
740 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
741 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
742 OPT_END()
743 };
744
745 memset(&opt, 0, sizeof(opt));
746 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
747 opt.relative = 1;
748 opt.pathname = 1;
749 opt.pattern_tail = &opt.pattern_list;
750 opt.regflags = REG_NEWLINE;
751
752 strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
753 opt.color = -1;
754 git_config(grep_config, &opt);
755 if (opt.color == -1)
756 opt.color = git_use_color_default;
757
758 /*
759 * If there is no -- then the paths must exist in the working
760 * tree. If there is no explicit pattern specified with -e or
761 * -f, we take the first unrecognized non option to be the
762 * pattern, but then what follows it must be zero or more
763 * valid refs up to the -- (if exists), and then existing
764 * paths. If there is an explicit pattern, then the first
765 * unrecognized non option is the beginning of the refs list
766 * that continues up to the -- (if exists), and then paths.
767 */
768 argc = parse_options(argc, argv, prefix, options, grep_usage,
769 PARSE_OPT_KEEP_DASHDASH |
770 PARSE_OPT_STOP_AT_NON_OPTION |
771 PARSE_OPT_NO_INTERNAL_HELP);
772
773 /* First unrecognized non-option token */
774 if (argc > 0 && !opt.pattern_list) {
775 append_grep_pattern(&opt, argv[0], "command line", 0,
776 GREP_PATTERN);
777 argv++;
778 argc--;
779 }
780
781 if (opt.color && !opt.color_external)
782 external_grep_allowed = 0;
783 if (!opt.pattern_list)
784 die("no pattern given.");
785 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
786 die("cannot mix --fixed-strings and regexp");
787 compile_grep_patterns(&opt);
788
789 /* Check revs and then paths */
790 for (i = 0; i < argc; i++) {
791 const char *arg = argv[i];
792 unsigned char sha1[20];
793 /* Is it a rev? */
794 if (!get_sha1(arg, sha1)) {
795 struct object *object = parse_object(sha1);
796 if (!object)
797 die("bad object %s", arg);
798 add_object_array(object, arg, &list);
799 continue;
800 }
801 if (!strcmp(arg, "--")) {
802 i++;
803 seen_dashdash = 1;
804 }
805 break;
806 }
807
808 /* The rest are paths */
809 if (!seen_dashdash) {
810 int j;
811 for (j = i; j < argc; j++)
812 verify_filename(prefix, argv[j]);
813 }
814
815 if (i < argc) {
816 paths = get_pathspec(prefix, argv + i);
817 if (opt.prefix_length && opt.relative) {
818 /* Make sure we do not get outside of paths */
819 for (i = 0; paths[i]; i++)
820 if (strncmp(prefix, paths[i], opt.prefix_length))
821 die("git grep: cannot generate relative filenames containing '..'");
822 }
823 }
824 else if (prefix) {
825 paths = xcalloc(2, sizeof(const char *));
826 paths[0] = prefix;
827 paths[1] = NULL;
828 }
829
830 if (!list.nr) {
831 if (!cached)
832 setup_work_tree();
833 return !grep_cache(&opt, paths, cached, external_grep_allowed);
834 }
835
836 if (cached)
837 die("both --cached and trees are given.");
838
839 for (i = 0; i < list.nr; i++) {
840 struct object *real_obj;
841 real_obj = deref_tag(list.objects[i].item, NULL, 0);
842 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
843 hit = 1;
844 }
845 free_grep_patterns(&opt);
846 return !hit;
847 }