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 <regex.h>
14#include <fnmatch.h>
15#include <sys/wait.h>
16/*
18 * git grep pathspecs are somewhat different from diff-tree pathspecs;
19 * pathname wildcards are allowed.
20 */
21static int pathspec_matches(const char **paths, const char *name)
22{
23 int namelen, i;
24 if (!paths || !*paths)
25 return 1;
26 namelen = strlen(name);
27 for (i = 0; paths[i]; i++) {
28 const char *match = paths[i];
29 int matchlen = strlen(match);
30 const char *cp, *meta;
31 if (!matchlen ||
33 ((matchlen <= namelen) &&
34 !strncmp(name, match, matchlen) &&
35 (match[matchlen-1] == '/' ||
36 name[matchlen] == '\0' || name[matchlen] == '/')))
37 return 1;
38 if (!fnmatch(match, name, 0))
39 return 1;
40 if (name[namelen-1] != '/')
41 continue;
42 /* We are being asked if the directory ("name") is worth
44 * descending into.
45 *
46 * Find the longest leading directory name that does
47 * not have metacharacter in the pathspec; the name
48 * we are looking at must overlap with that directory.
49 */
50 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
51 char ch = *cp;
52 if (ch == '*' || ch == '[' || ch == '?') {
53 meta = cp;
54 break;
55 }
56 }
57 if (!meta)
58 meta = cp; /* fully literal */
59 if (namelen <= meta - match) {
61 /* Looking at "Documentation/" and
62 * the pattern says "Documentation/howto/", or
63 * "Documentation/diff*.txt". The name we
64 * have should match prefix.
65 */
66 if (!memcmp(match, name, namelen))
67 return 1;
68 continue;
69 }
70 if (meta - match < namelen) {
72 /* Looking at "Documentation/howto/" and
73 * the pattern says "Documentation/h*";
74 * match up to "Do.../h"; this avoids descending
75 * into "Documentation/technical/".
76 */
77 if (!memcmp(match, name, meta - match))
78 return 1;
79 continue;
80 }
81 }
82 return 0;
83}
84struct grep_pat {
86 struct grep_pat *next;
87 const char *origin;
88 int no;
89 const char *pattern;
90 regex_t regexp;
91};
92struct grep_opt {
94 struct grep_pat *pattern_list;
95 struct grep_pat **pattern_tail;
96 regex_t regexp;
97 unsigned linenum:1;
98 unsigned invert:1;
99 unsigned name_only:1;
100 unsigned unmatch_name_only:1;
101 unsigned count:1;
102 unsigned word_regexp:1;
103 unsigned fixed:1;
104#define GREP_BINARY_DEFAULT 0
105#define GREP_BINARY_NOMATCH 1
106#define GREP_BINARY_TEXT 2
107 unsigned binary:2;
108 int regflags;
109 unsigned pre_context;
110 unsigned post_context;
111};
112static void add_pattern(struct grep_opt *opt, const char *pat,
114 const char *origin, int no)
115{
116 struct grep_pat *p = xcalloc(1, sizeof(*p));
117 p->pattern = pat;
118 p->origin = origin;
119 p->no = no;
120 *opt->pattern_tail = p;
121 opt->pattern_tail = &p->next;
122 p->next = NULL;
123}
124static void compile_patterns(struct grep_opt *opt)
126{
127 struct grep_pat *p;
128 for (p = opt->pattern_list; p; p = p->next) {
129 int err = regcomp(&p->regexp, p->pattern, opt->regflags);
130 if (err) {
131 char errbuf[1024];
132 char where[1024];
133 if (p->no)
134 sprintf(where, "In '%s' at %d, ",
135 p->origin, p->no);
136 else if (p->origin)
137 sprintf(where, "%s, ", p->origin);
138 else
139 where[0] = 0;
140 regerror(err, &p->regexp, errbuf, 1024);
141 regfree(&p->regexp);
142 die("%s'%s': %s", where, p->pattern, errbuf);
143 }
144 }
145}
146static char *end_of_line(char *cp, unsigned long *left)
148{
149 unsigned long l = *left;
150 while (l && *cp != '\n') {
151 l--;
152 cp++;
153 }
154 *left = l;
155 return cp;
156}
157static int word_char(char ch)
159{
160 return isalnum(ch) || ch == '_';
161}
162static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
164 const char *name, unsigned lno, char sign)
165{
166 printf("%s%c", name, sign);
167 if (opt->linenum)
168 printf("%d%c", lno, sign);
169 printf("%.*s\n", (int)(eol-bol), bol);
170}
171/*
173 * NEEDSWORK: share code with diff.c
174 */
175#define FIRST_FEW_BYTES 8000
176static int buffer_is_binary(const char *ptr, unsigned long size)
177{
178 if (FIRST_FEW_BYTES < size)
179 size = FIRST_FEW_BYTES;
180 if (memchr(ptr, 0, size))
181 return 1;
182 return 0;
183}
184static int fixmatch(const char *pattern, char *line, regmatch_t *match)
186{
187 char *hit = strstr(line, pattern);
188 if (!hit) {
189 match->rm_so = match->rm_eo = -1;
190 return REG_NOMATCH;
191 }
192 else {
193 match->rm_so = hit - line;
194 match->rm_eo = match->rm_so + strlen(pattern);
195 return 0;
196 }
197}
198static int grep_buffer(struct grep_opt *opt, const char *name,
200 char *buf, unsigned long size)
201{
202 char *bol = buf;
203 unsigned long left = size;
204 unsigned lno = 1;
205 struct pre_context_line {
206 char *bol;
207 char *eol;
208 } *prev = NULL, *pcl;
209 unsigned last_hit = 0;
210 unsigned last_shown = 0;
211 int binary_match_only = 0;
212 const char *hunk_mark = "";
213 unsigned count = 0;
214 if (buffer_is_binary(buf, size)) {
216 switch (opt->binary) {
217 case GREP_BINARY_DEFAULT:
218 binary_match_only = 1;
219 break;
220 case GREP_BINARY_NOMATCH:
221 return 0; /* Assume unmatch */
222 break;
223 default:
224 break;
225 }
226 }
227 if (opt->pre_context)
229 prev = xcalloc(opt->pre_context, sizeof(*prev));
230 if (opt->pre_context || opt->post_context)
231 hunk_mark = "--\n";
232 while (left) {
234 regmatch_t pmatch[10];
235 char *eol, ch;
236 int hit = 0;
237 struct grep_pat *p;
238 eol = end_of_line(bol, &left);
240 ch = *eol;
241 *eol = 0;
242 for (p = opt->pattern_list; p; p = p->next) {
244 if (!opt->fixed) {
245 regex_t *exp = &p->regexp;
246 hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
247 pmatch, 0);
248 }
249 else {
250 hit = !fixmatch(p->pattern, bol, pmatch);
251 }
252 if (hit && opt->word_regexp) {
254 /* Match beginning must be either
255 * beginning of the line, or at word
256 * boundary (i.e. the last char must
257 * not be alnum or underscore).
258 */
259 if ((pmatch[0].rm_so < 0) ||
260 (eol - bol) <= pmatch[0].rm_so ||
261 (pmatch[0].rm_eo < 0) ||
262 (eol - bol) < pmatch[0].rm_eo)
263 die("regexp returned nonsense");
264 if (pmatch[0].rm_so != 0 &&
265 word_char(bol[pmatch[0].rm_so-1]))
266 hit = 0;
267 if (pmatch[0].rm_eo != (eol-bol) &&
268 word_char(bol[pmatch[0].rm_eo]))
269 hit = 0;
270 }
271 if (hit)
272 break;
273 }
274 /* "grep -v -e foo -e bla" should list lines
275 * that do not have either, so inversion should
276 * be done outside.
277 */
278 if (opt->invert)
279 hit = !hit;
280 if (opt->unmatch_name_only) {
281 if (hit)
282 return 0;
283 goto next_line;
284 }
285 if (hit) {
286 count++;
287 if (binary_match_only) {
288 printf("Binary file %s matches\n", name);
289 return 1;
290 }
291 if (opt->name_only) {
292 printf("%s\n", name);
293 return 1;
294 }
295 /* Hit at this line. If we haven't shown the
296 * pre-context lines, we would need to show them.
297 * When asked to do "count", this still show
298 * the context which is nonsense, but the user
299 * deserves to get that ;-).
300 */
301 if (opt->pre_context) {
302 unsigned from;
303 if (opt->pre_context < lno)
304 from = lno - opt->pre_context;
305 else
306 from = 1;
307 if (from <= last_shown)
308 from = last_shown + 1;
309 if (last_shown && from != last_shown + 1)
310 printf(hunk_mark);
311 while (from < lno) {
312 pcl = &prev[lno-from-1];
313 show_line(opt, pcl->bol, pcl->eol,
314 name, from, '-');
315 from++;
316 }
317 last_shown = lno-1;
318 }
319 if (last_shown && lno != last_shown + 1)
320 printf(hunk_mark);
321 if (!opt->count)
322 show_line(opt, bol, eol, name, lno, ':');
323 last_shown = last_hit = lno;
324 }
325 else if (last_hit &&
326 lno <= last_hit + opt->post_context) {
327 /* If the last hit is within the post context,
328 * we need to show this line.
329 */
330 if (last_shown && lno != last_shown + 1)
331 printf(hunk_mark);
332 show_line(opt, bol, eol, name, lno, '-');
333 last_shown = lno;
334 }
335 if (opt->pre_context) {
336 memmove(prev+1, prev,
337 (opt->pre_context-1) * sizeof(*prev));
338 prev->bol = bol;
339 prev->eol = eol;
340 }
341 next_line:
343 *eol = ch;
344 bol = eol + 1;
345 if (!left)
346 break;
347 left--;
348 lno++;
349 }
350 if (opt->unmatch_name_only) {
352 /* We did not see any hit, so we want to show this */
353 printf("%s\n", name);
354 return 1;
355 }
356 /* NEEDSWORK:
358 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
359 * which feels mostly useless but sometimes useful. Maybe
360 * make it another option? For now suppress them.
361 */
362 if (opt->count && count)
363 printf("%s:%u\n", name, count);
364 return !!last_hit;
365}
366static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
368{
369 unsigned long size;
370 char *data;
371 char type[20];
372 int hit;
373 data = read_sha1_file(sha1, type, &size);
374 if (!data) {
375 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
376 return 0;
377 }
378 hit = grep_buffer(opt, name, data, size);
379 free(data);
380 return hit;
381}
382static int grep_file(struct grep_opt *opt, const char *filename)
384{
385 struct stat st;
386 int i;
387 char *data;
388 if (lstat(filename, &st) < 0) {
389 err_ret:
390 if (errno != ENOENT)
391 error("'%s': %s", filename, strerror(errno));
392 return 0;
393 }
394 if (!st.st_size)
395 return 0; /* empty file -- no grep hit */
396 if (!S_ISREG(st.st_mode))
397 return 0;
398 i = open(filename, O_RDONLY);
399 if (i < 0)
400 goto err_ret;
401 data = xmalloc(st.st_size + 1);
402 if (st.st_size != xread(i, data, st.st_size)) {
403 error("'%s': short read %s", filename, strerror(errno));
404 close(i);
405 free(data);
406 return 0;
407 }
408 close(i);
409 i = grep_buffer(opt, filename, data, st.st_size);
410 free(data);
411 return i;
412}
413static int exec_grep(int argc, const char **argv)
415{
416 pid_t pid;
417 int status;
418 argv[argc] = NULL;
420 pid = fork();
421 if (pid < 0)
422 return pid;
423 if (!pid) {
424 execvp("grep", (char **) argv);
425 exit(255);
426 }
427 while (waitpid(pid, &status, 0) < 0) {
428 if (errno == EINTR)
429 continue;
430 return -1;
431 }
432 if (WIFEXITED(status)) {
433 if (!WEXITSTATUS(status))
434 return 1;
435 return 0;
436 }
437 return -1;
438}
439#define MAXARGS 1000
441#define ARGBUF 4096
442#define push_arg(a) do { \
443 if (nr < MAXARGS) argv[nr++] = (a); \
444 else die("maximum number of args exceeded"); \
445 } while (0)
446static int external_grep(struct grep_opt *opt, const char **paths, int cached)
448{
449 int i, nr, argc, hit, len;
450 const char *argv[MAXARGS+1];
451 char randarg[ARGBUF];
452 char *argptr = randarg;
453 struct grep_pat *p;
454 len = nr = 0;
456 push_arg("grep");
457 if (opt->fixed)
458 push_arg("-F");
459 if (opt->linenum)
460 push_arg("-n");
461 if (opt->regflags & REG_EXTENDED)
462 push_arg("-E");
463 if (opt->regflags & REG_ICASE)
464 push_arg("-i");
465 if (opt->word_regexp)
466 push_arg("-w");
467 if (opt->name_only)
468 push_arg("-l");
469 if (opt->unmatch_name_only)
470 push_arg("-L");
471 if (opt->count)
472 push_arg("-c");
473 if (opt->post_context || opt->pre_context) {
474 if (opt->post_context != opt->pre_context) {
475 if (opt->pre_context) {
476 push_arg("-B");
477 len += snprintf(argptr, sizeof(randarg)-len,
478 "%u", opt->pre_context);
479 if (sizeof(randarg) <= len)
480 die("maximum length of args exceeded");
481 push_arg(argptr);
482 argptr += len;
483 }
484 if (opt->post_context) {
485 push_arg("-A");
486 len += snprintf(argptr, sizeof(randarg)-len,
487 "%u", opt->post_context);
488 if (sizeof(randarg) <= len)
489 die("maximum length of args exceeded");
490 push_arg(argptr);
491 argptr += len;
492 }
493 }
494 else {
495 push_arg("-C");
496 len += snprintf(argptr, sizeof(randarg)-len,
497 "%u", opt->post_context);
498 if (sizeof(randarg) <= len)
499 die("maximum length of args exceeded");
500 push_arg(argptr);
501 argptr += len;
502 }
503 }
504 for (p = opt->pattern_list; p; p = p->next) {
505 push_arg("-e");
506 push_arg(p->pattern);
507 }
508 /*
510 * To make sure we get the header printed out when we want it,
511 * add /dev/null to the paths to grep. This is unnecessary
512 * (and wrong) with "-l" or "-L", which always print out the
513 * name anyway.
514 *
515 * GNU grep has "-H", but this is portable.
516 */
517 if (!opt->name_only && !opt->unmatch_name_only)
518 push_arg("/dev/null");
519 hit = 0;
521 argc = nr;
522 for (i = 0; i < active_nr; i++) {
523 struct cache_entry *ce = active_cache[i];
524 char *name;
525 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
526 continue;
527 if (!pathspec_matches(paths, ce->name))
528 continue;
529 name = ce->name;
530 if (name[0] == '-') {
531 int len = ce_namelen(ce);
532 name = xmalloc(len + 3);
533 memcpy(name, "./", 2);
534 memcpy(name + 2, ce->name, len + 1);
535 }
536 argv[argc++] = name;
537 if (argc < MAXARGS)
538 continue;
539 hit += exec_grep(argc, argv);
540 argc = nr;
541 }
542 if (argc > nr)
543 hit += exec_grep(argc, argv);
544 return 0;
545}
546static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
548{
549 int hit = 0;
550 int nr;
551 read_cache();
552#ifdef __unix__
554 /*
555 * Use the external "grep" command for the case where
556 * we grep through the checked-out files. It tends to
557 * be a lot more optimized
558 */
559 if (!cached) {
560 hit = external_grep(opt, paths, cached);
561 if (hit >= 0)
562 return hit;
563 }
564#endif
565 for (nr = 0; nr < active_nr; nr++) {
567 struct cache_entry *ce = active_cache[nr];
568 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
569 continue;
570 if (!pathspec_matches(paths, ce->name))
571 continue;
572 if (cached)
573 hit |= grep_sha1(opt, ce->sha1, ce->name);
574 else
575 hit |= grep_file(opt, ce->name);
576 }
577 return hit;
578}
579static int grep_tree(struct grep_opt *opt, const char **paths,
581 struct tree_desc *tree,
582 const char *tree_name, const char *base)
583{
584 int len;
585 int hit = 0;
586 struct name_entry entry;
587 char *down;
588 char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
589 if (tree_name[0]) {
591 int offset = sprintf(path_buf, "%s:", tree_name);
592 down = path_buf + offset;
593 strcat(down, base);
594 }
595 else {
596 down = path_buf;
597 strcpy(down, base);
598 }
599 len = strlen(path_buf);
600 while (tree_entry(tree, &entry)) {
602 strcpy(path_buf + len, entry.path);
603 if (S_ISDIR(entry.mode))
605 /* Match "abc/" against pathspec to
606 * decide if we want to descend into "abc"
607 * directory.
608 */
609 strcpy(path_buf + len + entry.pathlen, "/");
610 if (!pathspec_matches(paths, down))
612 ;
613 else if (S_ISREG(entry.mode))
614 hit |= grep_sha1(opt, entry.sha1, path_buf);
615 else if (S_ISDIR(entry.mode)) {
616 char type[20];
617 struct tree_desc sub;
618 void *data;
619 data = read_sha1_file(entry.sha1, type, &sub.size);
620 if (!data)
621 die("unable to read tree (%s)",
622 sha1_to_hex(entry.sha1));
623 sub.buf = data;
624 hit |= grep_tree(opt, paths, &sub, tree_name, down);
625 free(data);
626 }
627 }
628 return hit;
629}
630static int grep_object(struct grep_opt *opt, const char **paths,
632 struct object *obj, const char *name)
633{
634 if (obj->type == TYPE_BLOB)
635 return grep_sha1(opt, obj->sha1, name);
636 if (obj->type == TYPE_COMMIT || obj->type == TYPE_TREE) {
637 struct tree_desc tree;
638 void *data;
639 int hit;
640 data = read_object_with_reference(obj->sha1, tree_type,
641 &tree.size, NULL);
642 if (!data)
643 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
644 tree.buf = data;
645 hit = grep_tree(opt, paths, &tree, name, "");
646 free(data);
647 return hit;
648 }
649 die("unable to grep from object of type %s", typename(obj->type));
650}
651static const char builtin_grep_usage[] =
653"git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
654int cmd_grep(int argc, const char **argv, char **envp)
656{
657 int hit = 0;
658 int cached = 0;
659 int seen_dashdash = 0;
660 struct grep_opt opt;
661 struct object_array list = { 0, 0, NULL };
662 const char *prefix = setup_git_directory();
663 const char **paths = NULL;
664 int i;
665 memset(&opt, 0, sizeof(opt));
667 opt.pattern_tail = &opt.pattern_list;
668 opt.regflags = REG_NEWLINE;
669 /*
671 * If there is no -- then the paths must exist in the working
672 * tree. If there is no explicit pattern specified with -e or
673 * -f, we take the first unrecognized non option to be the
674 * pattern, but then what follows it must be zero or more
675 * valid refs up to the -- (if exists), and then existing
676 * paths. If there is an explicit pattern, then the first
677 * unrecocnized non option is the beginning of the refs list
678 * that continues up to the -- (if exists), and then paths.
679 */
680 while (1 < argc) {
682 const char *arg = argv[1];
683 argc--; argv++;
684 if (!strcmp("--cached", arg)) {
685 cached = 1;
686 continue;
687 }
688 if (!strcmp("-a", arg) ||
689 !strcmp("--text", arg)) {
690 opt.binary = GREP_BINARY_TEXT;
691 continue;
692 }
693 if (!strcmp("-i", arg) ||
694 !strcmp("--ignore-case", arg)) {
695 opt.regflags |= REG_ICASE;
696 continue;
697 }
698 if (!strcmp("-I", arg)) {
699 opt.binary = GREP_BINARY_NOMATCH;
700 continue;
701 }
702 if (!strcmp("-v", arg) ||
703 !strcmp("--invert-match", arg)) {
704 opt.invert = 1;
705 continue;
706 }
707 if (!strcmp("-E", arg) ||
708 !strcmp("--extended-regexp", arg)) {
709 opt.regflags |= REG_EXTENDED;
710 continue;
711 }
712 if (!strcmp("-F", arg) ||
713 !strcmp("--fixed-strings", arg)) {
714 opt.fixed = 1;
715 continue;
716 }
717 if (!strcmp("-G", arg) ||
718 !strcmp("--basic-regexp", arg)) {
719 opt.regflags &= ~REG_EXTENDED;
720 continue;
721 }
722 if (!strcmp("-n", arg)) {
723 opt.linenum = 1;
724 continue;
725 }
726 if (!strcmp("-H", arg)) {
727 /* We always show the pathname, so this
728 * is a noop.
729 */
730 continue;
731 }
732 if (!strcmp("-l", arg) ||
733 !strcmp("--files-with-matches", arg)) {
734 opt.name_only = 1;
735 continue;
736 }
737 if (!strcmp("-L", arg) ||
738 !strcmp("--files-without-match", arg)) {
739 opt.unmatch_name_only = 1;
740 continue;
741 }
742 if (!strcmp("-c", arg) ||
743 !strcmp("--count", arg)) {
744 opt.count = 1;
745 continue;
746 }
747 if (!strcmp("-w", arg) ||
748 !strcmp("--word-regexp", arg)) {
749 opt.word_regexp = 1;
750 continue;
751 }
752 if (!strncmp("-A", arg, 2) ||
753 !strncmp("-B", arg, 2) ||
754 !strncmp("-C", arg, 2) ||
755 (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
756 unsigned num;
757 const char *scan;
758 switch (arg[1]) {
759 case 'A': case 'B': case 'C':
760 if (!arg[2]) {
761 if (argc <= 1)
762 usage(builtin_grep_usage);
763 scan = *++argv;
764 argc--;
765 }
766 else
767 scan = arg + 2;
768 break;
769 default:
770 scan = arg + 1;
771 break;
772 }
773 if (sscanf(scan, "%u", &num) != 1)
774 usage(builtin_grep_usage);
775 switch (arg[1]) {
776 case 'A':
777 opt.post_context = num;
778 break;
779 default:
780 case 'C':
781 opt.post_context = num;
782 case 'B':
783 opt.pre_context = num;
784 break;
785 }
786 continue;
787 }
788 if (!strcmp("-f", arg)) {
789 FILE *patterns;
790 int lno = 0;
791 char buf[1024];
792 if (argc <= 1)
793 usage(builtin_grep_usage);
794 patterns = fopen(argv[1], "r");
795 if (!patterns)
796 die("'%s': %s", argv[1], strerror(errno));
797 while (fgets(buf, sizeof(buf), patterns)) {
798 int len = strlen(buf);
799 if (buf[len-1] == '\n')
800 buf[len-1] = 0;
801 /* ignore empty line like grep does */
802 if (!buf[0])
803 continue;
804 add_pattern(&opt, strdup(buf), argv[1], ++lno);
805 }
806 fclose(patterns);
807 argv++;
808 argc--;
809 continue;
810 }
811 if (!strcmp("-e", arg)) {
812 if (1 < argc) {
813 add_pattern(&opt, argv[1], "-e option", 0);
814 argv++;
815 argc--;
816 continue;
817 }
818 usage(builtin_grep_usage);
819 }
820 if (!strcmp("--", arg))
821 break;
822 if (*arg == '-')
823 usage(builtin_grep_usage);
824 /* First unrecognized non-option token */
826 if (!opt.pattern_list) {
827 add_pattern(&opt, arg, "command line", 0);
828 break;
829 }
830 else {
831 /* We are looking at the first path or rev;
832 * it is found at argv[1] after leaving the
833 * loop.
834 */
835 argc++; argv--;
836 break;
837 }
838 }
839 if (!opt.pattern_list)
841 die("no pattern given.");
842 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
843 die("cannot mix --fixed-strings and regexp");
844 if (!opt.fixed)
845 compile_patterns(&opt);
846 /* Check revs and then paths */
848 for (i = 1; i < argc; i++) {
849 const char *arg = argv[i];
850 unsigned char sha1[20];
851 /* Is it a rev? */
852 if (!get_sha1(arg, sha1)) {
853 struct object *object = parse_object(sha1);
854 if (!object)
855 die("bad object %s", arg);
856 add_object_array(object, arg, &list);
857 continue;
858 }
859 if (!strcmp(arg, "--")) {
860 i++;
861 seen_dashdash = 1;
862 }
863 break;
864 }
865 /* The rest are paths */
867 if (!seen_dashdash) {
868 int j;
869 for (j = i; j < argc; j++)
870 verify_filename(prefix, argv[j]);
871 }
872 if (i < argc)
874 paths = get_pathspec(prefix, argv + i);
875 else if (prefix) {
876 paths = xcalloc(2, sizeof(const char *));
877 paths[0] = prefix;
878 paths[1] = NULL;
879 }
880 if (!list.nr)
882 return !grep_cache(&opt, paths, cached);
883 if (cached)
885 die("both --cached and trees are given.");
886 for (i = 0; i < list.nr; i++) {
888 struct object *real_obj;
889 real_obj = deref_tag(list.objects[i].item, NULL, 0);
890 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
891 hit = 1;
892 }
893 return !hit;
894}