git log -p --merge [[--] paths...]
[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 <regex.h>
14 #include <fnmatch.h>
15 #include <sys/wait.h>
16
17 /*
18 * git grep pathspecs are somewhat different from diff-tree pathspecs;
19 * pathname wildcards are allowed.
20 */
21 static 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
32 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
43 /* 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
60 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
71 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 }
84
85 struct grep_pat {
86 struct grep_pat *next;
87 const char *origin;
88 int no;
89 const char *pattern;
90 regex_t regexp;
91 };
92
93 struct 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 };
112
113 static 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 }
124
125 static 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 }
146
147 static 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 }
157
158 static int word_char(char ch)
159 {
160 return isalnum(ch) || ch == '_';
161 }
162
163 static 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
172 /*
173 * NEEDSWORK: share code with diff.c
174 */
175 #define FIRST_FEW_BYTES 8000
176 static 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 }
184
185 static 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 }
198
199 static 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
215 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
228 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
233 while (left) {
234 regmatch_t pmatch[10];
235 char *eol, ch;
236 int hit = 0;
237 struct grep_pat *p;
238
239 eol = end_of_line(bol, &left);
240 ch = *eol;
241 *eol = 0;
242
243 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
253 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
342 next_line:
343 *eol = ch;
344 bol = eol + 1;
345 if (!left)
346 break;
347 left--;
348 lno++;
349 }
350
351 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
357 /* 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 }
366
367 static 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 }
382
383 static 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 }
413
414 static int exec_grep(int argc, const char **argv)
415 {
416 pid_t pid;
417 int status;
418
419 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
440 #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)
446
447 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
448 {
449 int i, nr, argc, hit, len, status;
450 const char *argv[MAXARGS+1];
451 char randarg[ARGBUF];
452 char *argptr = randarg;
453 struct grep_pat *p;
454
455 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
509 /*
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
520 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 status = exec_grep(argc, argv);
540 if (0 < status)
541 hit = 1;
542 argc = nr;
543 }
544 if (argc > nr) {
545 status = exec_grep(argc, argv);
546 if (0 < status)
547 hit = 1;
548 }
549 return hit;
550 }
551
552 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
553 {
554 int hit = 0;
555 int nr;
556 read_cache();
557
558 #ifdef __unix__
559 /*
560 * Use the external "grep" command for the case where
561 * we grep through the checked-out files. It tends to
562 * be a lot more optimized
563 */
564 if (!cached) {
565 hit = external_grep(opt, paths, cached);
566 if (hit >= 0)
567 return hit;
568 }
569 #endif
570
571 for (nr = 0; nr < active_nr; nr++) {
572 struct cache_entry *ce = active_cache[nr];
573 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
574 continue;
575 if (!pathspec_matches(paths, ce->name))
576 continue;
577 if (cached)
578 hit |= grep_sha1(opt, ce->sha1, ce->name);
579 else
580 hit |= grep_file(opt, ce->name);
581 }
582 return hit;
583 }
584
585 static int grep_tree(struct grep_opt *opt, const char **paths,
586 struct tree_desc *tree,
587 const char *tree_name, const char *base)
588 {
589 int len;
590 int hit = 0;
591 struct name_entry entry;
592 char *down;
593 char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
594
595 if (tree_name[0]) {
596 int offset = sprintf(path_buf, "%s:", tree_name);
597 down = path_buf + offset;
598 strcat(down, base);
599 }
600 else {
601 down = path_buf;
602 strcpy(down, base);
603 }
604 len = strlen(path_buf);
605
606 while (tree_entry(tree, &entry)) {
607 strcpy(path_buf + len, entry.path);
608
609 if (S_ISDIR(entry.mode))
610 /* Match "abc/" against pathspec to
611 * decide if we want to descend into "abc"
612 * directory.
613 */
614 strcpy(path_buf + len + entry.pathlen, "/");
615
616 if (!pathspec_matches(paths, down))
617 ;
618 else if (S_ISREG(entry.mode))
619 hit |= grep_sha1(opt, entry.sha1, path_buf);
620 else if (S_ISDIR(entry.mode)) {
621 char type[20];
622 struct tree_desc sub;
623 void *data;
624 data = read_sha1_file(entry.sha1, type, &sub.size);
625 if (!data)
626 die("unable to read tree (%s)",
627 sha1_to_hex(entry.sha1));
628 sub.buf = data;
629 hit |= grep_tree(opt, paths, &sub, tree_name, down);
630 free(data);
631 }
632 }
633 return hit;
634 }
635
636 static int grep_object(struct grep_opt *opt, const char **paths,
637 struct object *obj, const char *name)
638 {
639 if (obj->type == TYPE_BLOB)
640 return grep_sha1(opt, obj->sha1, name);
641 if (obj->type == TYPE_COMMIT || obj->type == TYPE_TREE) {
642 struct tree_desc tree;
643 void *data;
644 int hit;
645 data = read_object_with_reference(obj->sha1, tree_type,
646 &tree.size, NULL);
647 if (!data)
648 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
649 tree.buf = data;
650 hit = grep_tree(opt, paths, &tree, name, "");
651 free(data);
652 return hit;
653 }
654 die("unable to grep from object of type %s", typename(obj->type));
655 }
656
657 static const char builtin_grep_usage[] =
658 "git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
659
660 static const char emsg_invalid_context_len[] =
661 "%s: invalid context length argument";
662 static const char emsg_missing_context_len[] =
663 "missing context length argument";
664 static const char emsg_missing_argument[] =
665 "option requires an argument -%s";
666
667 int cmd_grep(int argc, const char **argv, char **envp)
668 {
669 int hit = 0;
670 int cached = 0;
671 int seen_dashdash = 0;
672 struct grep_opt opt;
673 struct object_array list = { 0, 0, NULL };
674 const char *prefix = setup_git_directory();
675 const char **paths = NULL;
676 int i;
677
678 memset(&opt, 0, sizeof(opt));
679 opt.pattern_tail = &opt.pattern_list;
680 opt.regflags = REG_NEWLINE;
681
682 /*
683 * If there is no -- then the paths must exist in the working
684 * tree. If there is no explicit pattern specified with -e or
685 * -f, we take the first unrecognized non option to be the
686 * pattern, but then what follows it must be zero or more
687 * valid refs up to the -- (if exists), and then existing
688 * paths. If there is an explicit pattern, then the first
689 * unrecocnized non option is the beginning of the refs list
690 * that continues up to the -- (if exists), and then paths.
691 */
692
693 while (1 < argc) {
694 const char *arg = argv[1];
695 argc--; argv++;
696 if (!strcmp("--cached", arg)) {
697 cached = 1;
698 continue;
699 }
700 if (!strcmp("-a", arg) ||
701 !strcmp("--text", arg)) {
702 opt.binary = GREP_BINARY_TEXT;
703 continue;
704 }
705 if (!strcmp("-i", arg) ||
706 !strcmp("--ignore-case", arg)) {
707 opt.regflags |= REG_ICASE;
708 continue;
709 }
710 if (!strcmp("-I", arg)) {
711 opt.binary = GREP_BINARY_NOMATCH;
712 continue;
713 }
714 if (!strcmp("-v", arg) ||
715 !strcmp("--invert-match", arg)) {
716 opt.invert = 1;
717 continue;
718 }
719 if (!strcmp("-E", arg) ||
720 !strcmp("--extended-regexp", arg)) {
721 opt.regflags |= REG_EXTENDED;
722 continue;
723 }
724 if (!strcmp("-F", arg) ||
725 !strcmp("--fixed-strings", arg)) {
726 opt.fixed = 1;
727 continue;
728 }
729 if (!strcmp("-G", arg) ||
730 !strcmp("--basic-regexp", arg)) {
731 opt.regflags &= ~REG_EXTENDED;
732 continue;
733 }
734 if (!strcmp("-n", arg)) {
735 opt.linenum = 1;
736 continue;
737 }
738 if (!strcmp("-H", arg)) {
739 /* We always show the pathname, so this
740 * is a noop.
741 */
742 continue;
743 }
744 if (!strcmp("-l", arg) ||
745 !strcmp("--files-with-matches", arg)) {
746 opt.name_only = 1;
747 continue;
748 }
749 if (!strcmp("-L", arg) ||
750 !strcmp("--files-without-match", arg)) {
751 opt.unmatch_name_only = 1;
752 continue;
753 }
754 if (!strcmp("-c", arg) ||
755 !strcmp("--count", arg)) {
756 opt.count = 1;
757 continue;
758 }
759 if (!strcmp("-w", arg) ||
760 !strcmp("--word-regexp", arg)) {
761 opt.word_regexp = 1;
762 continue;
763 }
764 if (!strncmp("-A", arg, 2) ||
765 !strncmp("-B", arg, 2) ||
766 !strncmp("-C", arg, 2) ||
767 (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
768 unsigned num;
769 const char *scan;
770 switch (arg[1]) {
771 case 'A': case 'B': case 'C':
772 if (!arg[2]) {
773 if (argc <= 1)
774 die(emsg_missing_context_len);
775 scan = *++argv;
776 argc--;
777 }
778 else
779 scan = arg + 2;
780 break;
781 default:
782 scan = arg + 1;
783 break;
784 }
785 if (sscanf(scan, "%u", &num) != 1)
786 die(emsg_invalid_context_len, scan);
787 switch (arg[1]) {
788 case 'A':
789 opt.post_context = num;
790 break;
791 default:
792 case 'C':
793 opt.post_context = num;
794 case 'B':
795 opt.pre_context = num;
796 break;
797 }
798 continue;
799 }
800 if (!strcmp("-f", arg)) {
801 FILE *patterns;
802 int lno = 0;
803 char buf[1024];
804 if (argc <= 1)
805 die(emsg_missing_argument, arg);
806 patterns = fopen(argv[1], "r");
807 if (!patterns)
808 die("'%s': %s", argv[1], strerror(errno));
809 while (fgets(buf, sizeof(buf), patterns)) {
810 int len = strlen(buf);
811 if (buf[len-1] == '\n')
812 buf[len-1] = 0;
813 /* ignore empty line like grep does */
814 if (!buf[0])
815 continue;
816 add_pattern(&opt, strdup(buf), argv[1], ++lno);
817 }
818 fclose(patterns);
819 argv++;
820 argc--;
821 continue;
822 }
823 if (!strcmp("-e", arg)) {
824 if (1 < argc) {
825 add_pattern(&opt, argv[1], "-e option", 0);
826 argv++;
827 argc--;
828 continue;
829 }
830 die(emsg_missing_argument, arg);
831 }
832 if (!strcmp("--", arg)) {
833 /* later processing wants to have this at argv[1] */
834 argv--;
835 argc++;
836 break;
837 }
838 if (*arg == '-')
839 usage(builtin_grep_usage);
840
841 /* First unrecognized non-option token */
842 if (!opt.pattern_list) {
843 add_pattern(&opt, arg, "command line", 0);
844 break;
845 }
846 else {
847 /* We are looking at the first path or rev;
848 * it is found at argv[1] after leaving the
849 * loop.
850 */
851 argc++; argv--;
852 break;
853 }
854 }
855
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 if (!opt.fixed)
861 compile_patterns(&opt);
862
863 /* Check revs and then paths */
864 for (i = 1; i < argc; i++) {
865 const char *arg = argv[i];
866 unsigned char sha1[20];
867 /* Is it a rev? */
868 if (!get_sha1(arg, sha1)) {
869 struct object *object = parse_object(sha1);
870 if (!object)
871 die("bad object %s", arg);
872 add_object_array(object, arg, &list);
873 continue;
874 }
875 if (!strcmp(arg, "--")) {
876 i++;
877 seen_dashdash = 1;
878 }
879 break;
880 }
881
882 /* The rest are paths */
883 if (!seen_dashdash) {
884 int j;
885 for (j = i; j < argc; j++)
886 verify_filename(prefix, argv[j]);
887 }
888
889 if (i < argc)
890 paths = get_pathspec(prefix, argv + i);
891 else if (prefix) {
892 paths = xcalloc(2, sizeof(const char *));
893 paths[0] = prefix;
894 paths[1] = NULL;
895 }
896
897 if (!list.nr)
898 return !grep_cache(&opt, paths, cached);
899
900 if (cached)
901 die("both --cached and trees are given.");
902
903 for (i = 0; i < list.nr; i++) {
904 struct object *real_obj;
905 real_obj = deref_tag(list.objects[i].item, NULL, 0);
906 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
907 hit = 1;
908 }
909 return !hit;
910 }