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 "userdiff.h"
15#include "grep.h"
16#ifndef NO_EXTERNAL_GREP
18#ifdef __unix__
19#define NO_EXTERNAL_GREP 0
20#else
21#define NO_EXTERNAL_GREP 1
22#endif
23#endif
24static char const * const grep_usage[] = {
26 "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
27 NULL
28};
29static int grep_config(const char *var, const char *value, void *cb)
31{
32 struct grep_opt *opt = cb;
33 switch (userdiff_config(var, value)) {
35 case 0: break;
36 case -1: return -1;
37 default: return 0;
38 }
39 if (!strcmp(var, "color.grep")) {
41 opt->color = git_config_colorbool(var, value, -1);
42 return 0;
43 }
44 if (!strcmp(var, "color.grep.external"))
45 return git_config_string(&(opt->color_external), var, value);
46 if (!strcmp(var, "color.grep.match")) {
47 if (!value)
48 return config_error_nonbool(var);
49 color_parse(value, var, opt->color_match);
50 return 0;
51 }
52 return git_color_default_config(var, value, cb);
53}
54/*
56 * Return non-zero if max_depth is negative or path has no more then max_depth
57 * slashes.
58 */
59static int accept_subdir(const char *path, int max_depth)
60{
61 if (max_depth < 0)
62 return 1;
63 while ((path = strchr(path, '/')) != NULL) {
65 max_depth--;
66 if (max_depth < 0)
67 return 0;
68 path++;
69 }
70 return 1;
71}
72/*
74 * Return non-zero if name is a subdirectory of match and is not too deep.
75 */
76static int is_subdir(const char *name, int namelen,
77 const char *match, int matchlen, int max_depth)
78{
79 if (matchlen > namelen || strncmp(name, match, matchlen))
80 return 0;
81 if (name[matchlen] == '\0') /* exact match */
83 return 1;
84 if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
86 return accept_subdir(name + matchlen + 1, max_depth);
87 return 0;
89}
90/*
92 * git grep pathspecs are somewhat different from diff-tree pathspecs;
93 * pathname wildcards are allowed.
94 */
95static int pathspec_matches(const char **paths, const char *name, int max_depth)
96{
97 int namelen, i;
98 if (!paths || !*paths)
99 return accept_subdir(name, max_depth);
100 namelen = strlen(name);
101 for (i = 0; paths[i]; i++) {
102 const char *match = paths[i];
103 int matchlen = strlen(match);
104 const char *cp, *meta;
105 if (is_subdir(name, namelen, match, matchlen, max_depth))
107 return 1;
108 if (!fnmatch(match, name, 0))
109 return 1;
110 if (name[namelen-1] != '/')
111 continue;
112 /* We are being asked if the directory ("name") is worth
114 * descending into.
115 *
116 * Find the longest leading directory name that does
117 * not have metacharacter in the pathspec; the name
118 * we are looking at must overlap with that directory.
119 */
120 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
121 char ch = *cp;
122 if (ch == '*' || ch == '[' || ch == '?') {
123 meta = cp;
124 break;
125 }
126 }
127 if (!meta)
128 meta = cp; /* fully literal */
129 if (namelen <= meta - match) {
131 /* Looking at "Documentation/" and
132 * the pattern says "Documentation/howto/", or
133 * "Documentation/diff*.txt". The name we
134 * have should match prefix.
135 */
136 if (!memcmp(match, name, namelen))
137 return 1;
138 continue;
139 }
140 if (meta - match < namelen) {
142 /* Looking at "Documentation/howto/" and
143 * the pattern says "Documentation/h*";
144 * match up to "Do.../h"; this avoids descending
145 * into "Documentation/technical/".
146 */
147 if (!memcmp(match, name, meta - match))
148 return 1;
149 continue;
150 }
151 }
152 return 0;
153}
154static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
156{
157 unsigned long size;
158 char *data;
159 enum object_type type;
160 char *to_free = NULL;
161 int hit;
162 data = read_sha1_file(sha1, &type, &size);
164 if (!data) {
165 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
166 return 0;
167 }
168 if (opt->relative && opt->prefix_length) {
169 static char name_buf[PATH_MAX];
170 char *cp;
171 int name_len = strlen(name) - opt->prefix_length + 1;
172 if (!tree_name_len)
174 name += opt->prefix_length;
175 else {
176 if (ARRAY_SIZE(name_buf) <= name_len)
177 cp = to_free = xmalloc(name_len);
178 else
179 cp = name_buf;
180 memcpy(cp, name, tree_name_len);
181 strcpy(cp + tree_name_len,
182 name + tree_name_len + opt->prefix_length);
183 name = cp;
184 }
185 }
186 hit = grep_buffer(opt, name, data, size);
187 free(data);
188 free(to_free);
189 return hit;
190}
191static int grep_file(struct grep_opt *opt, const char *filename)
193{
194 struct stat st;
195 int i;
196 char *data;
197 size_t sz;
198 if (lstat(filename, &st) < 0) {
200 err_ret:
201 if (errno != ENOENT)
202 error("'%s': %s", filename, strerror(errno));
203 return 0;
204 }
205 if (!st.st_size)
206 return 0; /* empty file -- no grep hit */
207 if (!S_ISREG(st.st_mode))
208 return 0;
209 sz = xsize_t(st.st_size);
210 i = open(filename, O_RDONLY);
211 if (i < 0)
212 goto err_ret;
213 data = xmalloc(sz + 1);
214 if (st.st_size != read_in_full(i, data, sz)) {
215 error("'%s': short read %s", filename, strerror(errno));
216 close(i);
217 free(data);
218 return 0;
219 }
220 close(i);
221 if (opt->relative && opt->prefix_length)
222 filename += opt->prefix_length;
223 i = grep_buffer(opt, filename, data, sz);
224 free(data);
225 return i;
226}
227#if !NO_EXTERNAL_GREP
229static int exec_grep(int argc, const char **argv)
230{
231 pid_t pid;
232 int status;
233 argv[argc] = NULL;
235 trace_argv_printf(argv, "trace: grep:");
236 pid = fork();
237 if (pid < 0)
238 return pid;
239 if (!pid) {
240 execvp("grep", (char **) argv);
241 exit(255);
242 }
243 while (waitpid(pid, &status, 0) < 0) {
244 if (errno == EINTR)
245 continue;
246 return -1;
247 }
248 if (WIFEXITED(status)) {
249 if (!WEXITSTATUS(status))
250 return 1;
251 return 0;
252 }
253 return -1;
254}
255#define MAXARGS 1000
257#define ARGBUF 4096
258#define push_arg(a) do { \
259 if (nr < MAXARGS) argv[nr++] = (a); \
260 else die("maximum number of args exceeded"); \
261 } while (0)
262/*
264 * If you send a singleton filename to grep, it does not give
265 * the name of the file. GNU grep has "-H" but we would want
266 * that behaviour in a portable way.
267 *
268 * So we keep two pathnames in argv buffer unsent to grep in
269 * the main loop if we need to do more than one grep.
270 */
271static int flush_grep(struct grep_opt *opt,
272 int argc, int arg0, const char **argv, int *kept)
273{
274 int status;
275 int count = argc - arg0;
276 const char *kept_0 = NULL;
277 if (count <= 2) {
279 /*
280 * Because we keep at least 2 paths in the call from
281 * the main loop (i.e. kept != NULL), and MAXARGS is
282 * far greater than 2, this usually is a call to
283 * conclude the grep. However, the user could attempt
284 * to overflow the argv buffer by giving too many
285 * options to leave very small number of real
286 * arguments even for the call in the main loop.
287 */
288 if (kept)
289 die("insanely many options to grep");
290 /*
292 * If we have two or more paths, we do not have to do
293 * anything special, but we need to push /dev/null to
294 * get "-H" behaviour of GNU grep portably but when we
295 * are not doing "-l" nor "-L" nor "-c".
296 */
297 if (count == 1 &&
298 !opt->name_only &&
299 !opt->unmatch_name_only &&
300 !opt->count) {
301 argv[argc++] = "/dev/null";
302 argv[argc] = NULL;
303 }
304 }
305 else if (kept) {
307 /*
308 * Called because we found many paths and haven't finished
309 * iterating over the cache yet. We keep two paths
310 * for the concluding call. argv[argc-2] and argv[argc-1]
311 * has the last two paths, so save the first one away,
312 * replace it with NULL while sending the list to grep,
313 * and recover them after we are done.
314 */
315 *kept = 2;
316 kept_0 = argv[argc-2];
317 argv[argc-2] = NULL;
318 argc -= 2;
319 }
320 if (opt->pre_context || opt->post_context) {
322 /*
323 * grep handles hunk marks between files, but we need to
324 * do that ourselves between multiple calls.
325 */
326 if (opt->show_hunk_mark)
327 write_or_die(1, "--\n", 3);
328 else
329 opt->show_hunk_mark = 1;
330 }
331 status = exec_grep(argc, argv);
333 if (kept_0) {
335 /*
336 * Then recover them. Now the last arg is beyond the
337 * terminating NULL which is at argc, and the second
338 * from the last is what we saved away in kept_0
339 */
340 argv[arg0++] = kept_0;
341 argv[arg0] = argv[argc+1];
342 }
343 return status;
344}
345static void grep_add_color(struct strbuf *sb, const char *escape_seq)
347{
348 size_t orig_len = sb->len;
349 while (*escape_seq) {
351 if (*escape_seq == 'm')
352 strbuf_addch(sb, ';');
353 else if (*escape_seq != '\033' && *escape_seq != '[')
354 strbuf_addch(sb, *escape_seq);
355 escape_seq++;
356 }
357 if (sb->len > orig_len && sb->buf[sb->len - 1] == ';')
358 strbuf_setlen(sb, sb->len - 1);
359}
360static int has_skip_worktree_entry(struct grep_opt *opt, const char **paths)
362{
363 int nr;
364 for (nr = 0; nr < active_nr; nr++) {
365 struct cache_entry *ce = active_cache[nr];
366 if (!S_ISREG(ce->ce_mode))
367 continue;
368 if (!pathspec_matches(paths, ce->name, opt->max_depth))
369 continue;
370 if (ce_skip_worktree(ce))
371 return 1;
372 }
373 return 0;
374}
375static int external_grep(struct grep_opt *opt, const char **paths, int cached)
377{
378 int i, nr, argc, hit, len, status;
379 const char *argv[MAXARGS+1];
380 char randarg[ARGBUF];
381 char *argptr = randarg;
382 struct grep_pat *p;
383 if (opt->extended || (opt->relative && opt->prefix_length)
385 || has_skip_worktree_entry(opt, paths))
386 return -1;
387 len = nr = 0;
388 push_arg("grep");
389 if (opt->fixed)
390 push_arg("-F");
391 if (opt->linenum)
392 push_arg("-n");
393 if (!opt->pathname)
394 push_arg("-h");
395 if (opt->regflags & REG_EXTENDED)
396 push_arg("-E");
397 if (opt->regflags & REG_ICASE)
398 push_arg("-i");
399 if (opt->binary == GREP_BINARY_NOMATCH)
400 push_arg("-I");
401 if (opt->word_regexp)
402 push_arg("-w");
403 if (opt->name_only)
404 push_arg("-l");
405 if (opt->unmatch_name_only)
406 push_arg("-L");
407 if (opt->null_following_name)
408 /* in GNU grep git's "-z" translates to "-Z" */
409 push_arg("-Z");
410 if (opt->count)
411 push_arg("-c");
412 if (opt->post_context || opt->pre_context) {
413 if (opt->post_context != opt->pre_context) {
414 if (opt->pre_context) {
415 push_arg("-B");
416 len += snprintf(argptr, sizeof(randarg)-len,
417 "%u", opt->pre_context) + 1;
418 if (sizeof(randarg) <= len)
419 die("maximum length of args exceeded");
420 push_arg(argptr);
421 argptr += len;
422 }
423 if (opt->post_context) {
424 push_arg("-A");
425 len += snprintf(argptr, sizeof(randarg)-len,
426 "%u", opt->post_context) + 1;
427 if (sizeof(randarg) <= len)
428 die("maximum length of args exceeded");
429 push_arg(argptr);
430 argptr += len;
431 }
432 }
433 else {
434 push_arg("-C");
435 len += snprintf(argptr, sizeof(randarg)-len,
436 "%u", opt->post_context) + 1;
437 if (sizeof(randarg) <= len)
438 die("maximum length of args exceeded");
439 push_arg(argptr);
440 argptr += len;
441 }
442 }
443 for (p = opt->pattern_list; p; p = p->next) {
444 push_arg("-e");
445 push_arg(p->pattern);
446 }
447 if (opt->color) {
448 struct strbuf sb = STRBUF_INIT;
449 grep_add_color(&sb, opt->color_match);
451 setenv("GREP_COLOR", sb.buf, 1);
452 strbuf_reset(&sb);
454 strbuf_addstr(&sb, "mt=");
455 grep_add_color(&sb, opt->color_match);
456 strbuf_addstr(&sb, ":sl=:cx=:fn=:ln=:bn=:se=");
457 setenv("GREP_COLORS", sb.buf, 1);
458 strbuf_release(&sb);
460 if (opt->color_external && strlen(opt->color_external) > 0)
462 push_arg(opt->color_external);
463 }
464 hit = 0;
466 argc = nr;
467 for (i = 0; i < active_nr; i++) {
468 struct cache_entry *ce = active_cache[i];
469 char *name;
470 int kept;
471 if (!S_ISREG(ce->ce_mode))
472 continue;
473 if (!pathspec_matches(paths, ce->name, opt->max_depth))
474 continue;
475 name = ce->name;
476 if (name[0] == '-') {
477 int len = ce_namelen(ce);
478 name = xmalloc(len + 3);
479 memcpy(name, "./", 2);
480 memcpy(name + 2, ce->name, len + 1);
481 }
482 argv[argc++] = name;
483 if (MAXARGS <= argc) {
484 status = flush_grep(opt, argc, nr, argv, &kept);
485 if (0 < status)
486 hit = 1;
487 argc = nr + kept;
488 }
489 if (ce_stage(ce)) {
490 do {
491 i++;
492 } while (i < active_nr &&
493 !strcmp(ce->name, active_cache[i]->name));
494 i--; /* compensate for loop control */
495 }
496 }
497 if (argc > nr) {
498 status = flush_grep(opt, argc, nr, argv, NULL);
499 if (0 < status)
500 hit = 1;
501 }
502 return hit;
503}
504#endif
505static int grep_cache(struct grep_opt *opt, const char **paths, int cached,
507 int external_grep_allowed)
508{
509 int hit = 0;
510 int nr;
511 read_cache();
512#if !NO_EXTERNAL_GREP
514 /*
515 * Use the external "grep" command for the case where
516 * we grep through the checked-out files. It tends to
517 * be a lot more optimized
518 */
519 if (!cached && external_grep_allowed) {
520 hit = external_grep(opt, paths, cached);
521 if (hit >= 0)
522 return hit;
523 }
524#endif
525 for (nr = 0; nr < active_nr; nr++) {
527 struct cache_entry *ce = active_cache[nr];
528 if (!S_ISREG(ce->ce_mode))
529 continue;
530 if (!pathspec_matches(paths, ce->name, opt->max_depth))
531 continue;
532 /*
533 * If CE_VALID is on, we assume worktree file and its cache entry
534 * are identical, even if worktree file has been modified, so use
535 * cache version instead
536 */
537 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
538 if (ce_stage(ce))
539 continue;
540 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
541 }
542 else
543 hit |= grep_file(opt, ce->name);
544 if (ce_stage(ce)) {
545 do {
546 nr++;
547 } while (nr < active_nr &&
548 !strcmp(ce->name, active_cache[nr]->name));
549 nr--; /* compensate for loop control */
550 }
551 }
552 free_grep_patterns(opt);
553 return hit;
554}
555static int grep_tree(struct grep_opt *opt, const char **paths,
557 struct tree_desc *tree,
558 const char *tree_name, const char *base)
559{
560 int len;
561 int hit = 0;
562 struct name_entry entry;
563 char *down;
564 int tn_len = strlen(tree_name);
565 struct strbuf pathbuf;
566 strbuf_init(&pathbuf, PATH_MAX + tn_len);
568 if (tn_len) {
570 strbuf_add(&pathbuf, tree_name, tn_len);
571 strbuf_addch(&pathbuf, ':');
572 tn_len = pathbuf.len;
573 }
574 strbuf_addstr(&pathbuf, base);
575 len = pathbuf.len;
576 while (tree_entry(tree, &entry)) {
578 int te_len = tree_entry_len(entry.path, entry.sha1);
579 pathbuf.len = len;
580 strbuf_add(&pathbuf, entry.path, te_len);
581 if (S_ISDIR(entry.mode))
583 /* Match "abc/" against pathspec to
584 * decide if we want to descend into "abc"
585 * directory.
586 */
587 strbuf_addch(&pathbuf, '/');
588 down = pathbuf.buf + tn_len;
590 if (!pathspec_matches(paths, down, opt->max_depth))
591 ;
592 else if (S_ISREG(entry.mode))
593 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
594 else if (S_ISDIR(entry.mode)) {
595 enum object_type type;
596 struct tree_desc sub;
597 void *data;
598 unsigned long size;
599 data = read_sha1_file(entry.sha1, &type, &size);
601 if (!data)
602 die("unable to read tree (%s)",
603 sha1_to_hex(entry.sha1));
604 init_tree_desc(&sub, data, size);
605 hit |= grep_tree(opt, paths, &sub, tree_name, down);
606 free(data);
607 }
608 }
609 strbuf_release(&pathbuf);
610 return hit;
611}
612static int grep_object(struct grep_opt *opt, const char **paths,
614 struct object *obj, const char *name)
615{
616 if (obj->type == OBJ_BLOB)
617 return grep_sha1(opt, obj->sha1, name, 0);
618 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
619 struct tree_desc tree;
620 void *data;
621 unsigned long size;
622 int hit;
623 data = read_object_with_reference(obj->sha1, tree_type,
624 &size, NULL);
625 if (!data)
626 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
627 init_tree_desc(&tree, data, size);
628 hit = grep_tree(opt, paths, &tree, name, "");
629 free(data);
630 return hit;
631 }
632 die("unable to grep from object of type %s", typename(obj->type));
633}
634static int context_callback(const struct option *opt, const char *arg,
636 int unset)
637{
638 struct grep_opt *grep_opt = opt->value;
639 int value;
640 const char *endp;
641 if (unset) {
643 grep_opt->pre_context = grep_opt->post_context = 0;
644 return 0;
645 }
646 value = strtol(arg, (char **)&endp, 10);
647 if (*endp) {
648 return error("switch `%c' expects a numerical value",
649 opt->short_name);
650 }
651 grep_opt->pre_context = grep_opt->post_context = value;
652 return 0;
653}
654static int file_callback(const struct option *opt, const char *arg, int unset)
656{
657 struct grep_opt *grep_opt = opt->value;
658 FILE *patterns;
659 int lno = 0;
660 struct strbuf sb;
661 patterns = fopen(arg, "r");
663 if (!patterns)
664 die_errno("cannot open '%s'", arg);
665 while (strbuf_getline(&sb, patterns, '\n') == 0) {
666 /* ignore empty line like grep does */
667 if (sb.len == 0)
668 continue;
669 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
670 ++lno, GREP_PATTERN);
671 }
672 fclose(patterns);
673 strbuf_release(&sb);
674 return 0;
675}
676static int not_callback(const struct option *opt, const char *arg, int unset)
678{
679 struct grep_opt *grep_opt = opt->value;
680 append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
681 return 0;
682}
683static int and_callback(const struct option *opt, const char *arg, int unset)
685{
686 struct grep_opt *grep_opt = opt->value;
687 append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
688 return 0;
689}
690static int open_callback(const struct option *opt, const char *arg, int unset)
692{
693 struct grep_opt *grep_opt = opt->value;
694 append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
695 return 0;
696}
697static int close_callback(const struct option *opt, const char *arg, int unset)
699{
700 struct grep_opt *grep_opt = opt->value;
701 append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
702 return 0;
703}
704static int pattern_callback(const struct option *opt, const char *arg,
706 int unset)
707{
708 struct grep_opt *grep_opt = opt->value;
709 append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
710 return 0;
711}
712static int help_callback(const struct option *opt, const char *arg, int unset)
714{
715 return -1;
716}
717int cmd_grep(int argc, const char **argv, const char *prefix)
719{
720 int hit = 0;
721 int cached = 0;
722 int external_grep_allowed = 1;
723 int seen_dashdash = 0;
724 struct grep_opt opt;
725 struct object_array list = { 0, 0, NULL };
726 const char **paths = NULL;
727 int i;
728 int dummy;
729 struct option options[] = {
730 OPT_BOOLEAN(0, "cached", &cached,
731 "search in index instead of in the work tree"),
732 OPT_GROUP(""),
733 OPT_BOOLEAN('v', "invert-match", &opt.invert,
734 "show non-matching lines"),
735 OPT_BIT('i', "ignore-case", &opt.regflags,
736 "case insensitive matching", REG_ICASE),
737 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
738 "match patterns only at word boundaries"),
739 OPT_SET_INT('a', "text", &opt.binary,
740 "process binary files as text", GREP_BINARY_TEXT),
741 OPT_SET_INT('I', NULL, &opt.binary,
742 "don't match patterns in binary files",
743 GREP_BINARY_NOMATCH),
744 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
745 "descend at most <depth> levels", PARSE_OPT_NONEG,
746 NULL, 1 },
747 OPT_GROUP(""),
748 OPT_BIT('E', "extended-regexp", &opt.regflags,
749 "use extended POSIX regular expressions", REG_EXTENDED),
750 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
751 "use basic POSIX regular expressions (default)",
752 REG_EXTENDED),
753 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
754 "interpret patterns as fixed strings"),
755 OPT_GROUP(""),
756 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
757 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
758 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
759 OPT_NEGBIT(0, "full-name", &opt.relative,
760 "show filenames relative to top directory", 1),
761 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
762 "show only filenames instead of matching lines"),
763 OPT_BOOLEAN(0, "name-only", &opt.name_only,
764 "synonym for --files-with-matches"),
765 OPT_BOOLEAN('L', "files-without-match",
766 &opt.unmatch_name_only,
767 "show only the names of files without match"),
768 OPT_BOOLEAN('z', "null", &opt.null_following_name,
769 "print NUL after filenames"),
770 OPT_BOOLEAN('c', "count", &opt.count,
771 "show the number of matches instead of matching lines"),
772 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
773 OPT_GROUP(""),
774 OPT_CALLBACK('C', NULL, &opt, "n",
775 "show <n> context lines before and after matches",
776 context_callback),
777 OPT_INTEGER('B', NULL, &opt.pre_context,
778 "show <n> context lines before matches"),
779 OPT_INTEGER('A', NULL, &opt.post_context,
780 "show <n> context lines after matches"),
781 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
782 context_callback),
783 OPT_BOOLEAN('p', "show-function", &opt.funcname,
784 "show a line with the function name before matches"),
785 OPT_GROUP(""),
786 OPT_CALLBACK('f', NULL, &opt, "file",
787 "read patterns from file", file_callback),
788 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
789 "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
790 { OPTION_CALLBACK, 0, "and", &opt, NULL,
791 "combine patterns specified with -e",
792 PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
793 OPT_BOOLEAN(0, "or", &dummy, ""),
794 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
795 PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
796 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
797 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
798 open_callback },
799 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
800 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
801 close_callback },
802 OPT_BOOLEAN(0, "all-match", &opt.all_match,
803 "show only matches from files that match all patterns"),
804 OPT_GROUP(""),
805#if NO_EXTERNAL_GREP
806 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
807 "allow calling of grep(1) (ignored by this build)"),
808#else
809 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
810 "allow calling of grep(1) (default)"),
811#endif
812 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
813 PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
814 OPT_END()
815 };
816 memset(&opt, 0, sizeof(opt));
818 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
819 opt.relative = 1;
820 opt.pathname = 1;
821 opt.pattern_tail = &opt.pattern_list;
822 opt.regflags = REG_NEWLINE;
823 opt.max_depth = -1;
824 strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
826 opt.color = -1;
827 git_config(grep_config, &opt);
828 if (opt.color == -1)
829 opt.color = git_use_color_default;
830 /*
832 * If there is no -- then the paths must exist in the working
833 * tree. If there is no explicit pattern specified with -e or
834 * -f, we take the first unrecognized non option to be the
835 * pattern, but then what follows it must be zero or more
836 * valid refs up to the -- (if exists), and then existing
837 * paths. If there is an explicit pattern, then the first
838 * unrecognized non option is the beginning of the refs list
839 * that continues up to the -- (if exists), and then paths.
840 */
841 argc = parse_options(argc, argv, prefix, options, grep_usage,
842 PARSE_OPT_KEEP_DASHDASH |
843 PARSE_OPT_STOP_AT_NON_OPTION |
844 PARSE_OPT_NO_INTERNAL_HELP);
845 /* First unrecognized non-option token */
847 if (argc > 0 && !opt.pattern_list) {
848 append_grep_pattern(&opt, argv[0], "command line", 0,
849 GREP_PATTERN);
850 argv++;
851 argc--;
852 }
853 if ((opt.color && !opt.color_external) || opt.funcname)
855 external_grep_allowed = 0;
856 if (!opt.pattern_list)
857 die("no pattern given.");
858 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
859 die("cannot mix --fixed-strings and regexp");
860 compile_grep_patterns(&opt);
861 /* Check revs and then paths */
863 for (i = 0; i < argc; i++) {
864 const char *arg = argv[i];
865 unsigned char sha1[20];
866 /* Is it a rev? */
867 if (!get_sha1(arg, sha1)) {
868 struct object *object = parse_object(sha1);
869 if (!object)
870 die("bad object %s", arg);
871 add_object_array(object, arg, &list);
872 continue;
873 }
874 if (!strcmp(arg, "--")) {
875 i++;
876 seen_dashdash = 1;
877 }
878 break;
879 }
880 /* The rest are paths */
882 if (!seen_dashdash) {
883 int j;
884 for (j = i; j < argc; j++)
885 verify_filename(prefix, argv[j]);
886 }
887 if (i < argc) {
889 paths = get_pathspec(prefix, argv + i);
890 if (opt.prefix_length && opt.relative) {
891 /* Make sure we do not get outside of paths */
892 for (i = 0; paths[i]; i++)
893 if (strncmp(prefix, paths[i], opt.prefix_length))
894 die("git grep: cannot generate relative filenames containing '..'");
895 }
896 }
897 else if (prefix) {
898 paths = xcalloc(2, sizeof(const char *));
899 paths[0] = prefix;
900 paths[1] = NULL;
901 }
902 if (!list.nr) {
904 if (!cached)
905 setup_work_tree();
906 return !grep_cache(&opt, paths, cached, external_grep_allowed);
907 }
908 if (cached)
910 die("both --cached and trees are given.");
911 for (i = 0; i < list.nr; i++) {
913 struct object *real_obj;
914 real_obj = deref_tag(list.objects[i].item, NULL, 0);
915 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
916 hit = 1;
917 }
918 free_grep_patterns(&opt);
919 return !hit;
920}