169a91c17e6a9c5c91648e13b45944bf8602d5ce
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#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
23static char const * const grep_usage[] = {
25 "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
26 NULL
27};
28static int grep_config(const char *var, const char *value, void *cb)
30{
31 struct grep_opt *opt = cb;
32 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/*
49 * git grep pathspecs are somewhat different from diff-tree pathspecs;
50 * pathname wildcards are allowed.
51 */
52static 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 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 /* 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 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 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}
115static 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 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 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}
152static 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 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#if !NO_EXTERNAL_GREP
190static int exec_grep(int argc, const char **argv)
191{
192 pid_t pid;
193 int status;
194 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#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/*
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 */
231static 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 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 /*
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 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 status = exec_grep(argc, argv);
282 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}
294static void grep_add_color(struct strbuf *sb, const char *escape_seq)
296{
297 size_t orig_len = sb->len;
298 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}
309static 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 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 grep_add_color(&sb, opt->color_match);
384 setenv("GREP_COLOR", sb.buf, 1);
385 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 strbuf_release(&sb);
393 if (opt->color_external && strlen(opt->color_external) > 0)
395 push_arg(opt->color_external);
396 }
397 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
438static 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#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 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}
488static 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 strbuf_init(&pathbuf, PATH_MAX + tn_len);
501 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 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 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 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 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}
545static 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}
567int context_callback(const struct option *opt, const char *arg, int unset)
569{
570 struct grep_opt *grep_opt = opt->value;
571 int value;
572 const char *endp;
573 if (unset) {
575 grep_opt->pre_context = grep_opt->post_context = 0;
576 return 0;
577 }
578 value = strtol(arg, (char **)&endp, 10);
579 if (*endp) {
580 return error("switch `%c' expects a numerical value",
581 opt->short_name);
582 }
583 grep_opt->pre_context = grep_opt->post_context = value;
584 return 0;
585}
586int file_callback(const struct option *opt, const char *arg, int unset)
588{
589 struct grep_opt *grep_opt = opt->value;
590 FILE *patterns;
591 int lno = 0;
592 struct strbuf sb;
593 patterns = fopen(arg, "r");
595 if (!patterns)
596 die("'%s': %s", arg, strerror(errno));
597 while (strbuf_getline(&sb, patterns, '\n') == 0) {
598 /* ignore empty line like grep does */
599 if (sb.len == 0)
600 continue;
601 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
602 ++lno, GREP_PATTERN);
603 }
604 fclose(patterns);
605 strbuf_release(&sb);
606 return 0;
607}
608int not_callback(const struct option *opt, const char *arg, int unset)
610{
611 struct grep_opt *grep_opt = opt->value;
612 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
613 return 0;
614}
615int and_callback(const struct option *opt, const char *arg, int unset)
617{
618 struct grep_opt *grep_opt = opt->value;
619 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
620 return 0;
621}
622int open_callback(const struct option *opt, const char *arg, int unset)
624{
625 struct grep_opt *grep_opt = opt->value;
626 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
627 return 0;
628}
629int close_callback(const struct option *opt, const char *arg, int unset)
631{
632 struct grep_opt *grep_opt = opt->value;
633 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
634 return 0;
635}
636int pattern_callback(const struct option *opt, const char *arg, int unset)
638{
639 struct grep_opt *grep_opt = opt->value;
640 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
641 return 0;
642}
643int help_callback(const struct option *opt, const char *arg, int unset)
645{
646 return -1;
647}
648int cmd_grep(int argc, const char **argv, const char *prefix)
650{
651 int hit = 0;
652 int cached = 0;
653 int external_grep_allowed = 1;
654 int seen_dashdash = 0;
655 struct grep_opt opt;
656 struct object_array list = { 0, 0, NULL };
657 const char **paths = NULL;
658 int i;
659 int dummy;
660 struct option options[] = {
661 OPT_BOOLEAN(0, "cached", &cached,
662 "search in index instead of in the work tree"),
663 OPT_GROUP(""),
664 OPT_BOOLEAN('v', "invert-match", &opt.invert,
665 "show non-matching lines"),
666 OPT_BIT('i', "ignore-case", &opt.regflags,
667 "case insensitive matching", REG_ICASE),
668 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
669 "match patterns only at word boundaries"),
670 OPT_SET_INT('a', "text", &opt.binary,
671 "process binary files as text", GREP_BINARY_TEXT),
672 OPT_SET_INT('I', NULL, &opt.binary,
673 "don't match patterns in binary files",
674 GREP_BINARY_NOMATCH),
675 OPT_GROUP(""),
676 OPT_BIT('E', "extended-regexp", &opt.regflags,
677 "use extended POSIX regular expressions", REG_EXTENDED),
678 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
679 "use basic POSIX regular expressions (default)",
680 REG_EXTENDED),
681 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
682 "interpret patterns as fixed strings"),
683 OPT_GROUP(""),
684 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
685 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
686 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
687 OPT_NEGBIT(0, "full-name", &opt.relative,
688 "show filenames relative to top directory", 1),
689 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
690 "show only filenames instead of matching lines"),
691 OPT_BOOLEAN(0, "name-only", &opt.name_only,
692 "synonym for --files-with-matches"),
693 OPT_BOOLEAN('L', "files-without-match",
694 &opt.unmatch_name_only,
695 "show only the names of files without match"),
696 OPT_BOOLEAN('z', "null", &opt.null_following_name,
697 "print NUL after filenames"),
698 OPT_BOOLEAN('c', "count", &opt.count,
699 "show the number of matches instead of matching lines"),
700 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
701 OPT_GROUP(""),
702 OPT_CALLBACK('C', NULL, &opt, "n",
703 "show <n> context lines before and after matches",
704 context_callback),
705 OPT_INTEGER('B', NULL, &opt.pre_context,
706 "show <n> context lines before matches"),
707 OPT_INTEGER('A', NULL, &opt.post_context,
708 "show <n> context lines after matches"),
709 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
710 context_callback),
711 OPT_GROUP(""),
712 OPT_CALLBACK('f', NULL, &opt, "file",
713 "read patterns from file", file_callback),
714 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
715 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
716 { OPTION_CALLBACK, 0, "and", &opt, NULL,
717 "combine patterns specified with -e",
718 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
719 OPT_BOOLEAN(0, "or", &dummy, ""),
720 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
721 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
722 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
723 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
724 open_callback },
725 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
726 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
727 close_callback },
728 OPT_BOOLEAN(0, "all-match", &opt.all_match,
729 "show only matches from files that match all patterns"),
730 OPT_GROUP(""),
731#if NO_EXTERNAL_GREP
732 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
733 "allow calling of grep(1) (ignored by this build)"),
734#else
735 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
736 "allow calling of grep(1) (default)"),
737#endif
738 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
739 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
740 OPT_END()
741 };
742 memset(&opt, 0, sizeof(opt));
744 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
745 opt.relative = 1;
746 opt.pathname = 1;
747 opt.pattern_tail = &opt.pattern_list;
748 opt.regflags = REG_NEWLINE;
749 strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
751 opt.color = -1;
752 git_config(grep_config, &opt);
753 if (opt.color == -1)
754 opt.color = git_use_color_default;
755 /*
757 * If there is no -- then the paths must exist in the working
758 * tree. If there is no explicit pattern specified with -e or
759 * -f, we take the first unrecognized non option to be the
760 * pattern, but then what follows it must be zero or more
761 * valid refs up to the -- (if exists), and then existing
762 * paths. If there is an explicit pattern, then the first
763 * unrecognized non option is the beginning of the refs list
764 * that continues up to the -- (if exists), and then paths.
765 */
766 argc = parse_options(argc, argv, options, grep_usage,
767 PARSE_OPT_KEEP_DASHDASH |
768 PARSE_OPT_STOP_AT_NON_OPTION |
769 PARSE_OPT_NO_INTERNAL_HELP);
770 /* First unrecognized non-option token */
772 if (argc > 0 && !opt.pattern_list) {
773 append_grep_pattern(&opt, argv[0], "command line", 0,
774 GREP_PATTERN);
775 argv++;
776 argc--;
777 }
778 if (opt.color && !opt.color_external)
780 external_grep_allowed = 0;
781 if (!opt.pattern_list)
782 die("no pattern given.");
783 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
784 die("cannot mix --fixed-strings and regexp");
785 compile_grep_patterns(&opt);
786 /* Check revs and then paths */
788 for (i = 0; i < argc; i++) {
789 const char *arg = argv[i];
790 unsigned char sha1[20];
791 /* Is it a rev? */
792 if (!get_sha1(arg, sha1)) {
793 struct object *object = parse_object(sha1);
794 if (!object)
795 die("bad object %s", arg);
796 add_object_array(object, arg, &list);
797 continue;
798 }
799 if (!strcmp(arg, "--")) {
800 i++;
801 seen_dashdash = 1;
802 }
803 break;
804 }
805 /* The rest are paths */
807 if (!seen_dashdash) {
808 int j;
809 for (j = i; j < argc; j++)
810 verify_filename(prefix, argv[j]);
811 }
812 if (i < argc) {
814 paths = get_pathspec(prefix, argv + i);
815 if (opt.prefix_length && opt.relative) {
816 /* Make sure we do not get outside of paths */
817 for (i = 0; paths[i]; i++)
818 if (strncmp(prefix, paths[i], opt.prefix_length))
819 die("git grep: cannot generate relative filenames containing '..'");
820 }
821 }
822 else if (prefix) {
823 paths = xcalloc(2, sizeof(const char *));
824 paths[0] = prefix;
825 paths[1] = NULL;
826 }
827 if (!list.nr) {
829 if (!cached)
830 setup_work_tree();
831 return !grep_cache(&opt, paths, cached, external_grep_allowed);
832 }
833 if (cached)
835 die("both --cached and trees are given.");
836 for (i = 0; i < list.nr; i++) {
838 struct object *real_obj;
839 real_obj = deref_tag(list.objects[i].item, NULL, 0);
840 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
841 hit = 1;
842 }
843 free_grep_patterns(&opt);
844 return !hit;
845}