tree_entry(): new tree-walking helper function
[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 <= namelen) &&
33 !strncmp(name, match, matchlen) &&
34 (match[matchlen-1] == '/' ||
35 name[matchlen] == '\0' || name[matchlen] == '/'))
36 return 1;
37 if (!fnmatch(match, name, 0))
38 return 1;
39 if (name[namelen-1] != '/')
40 continue;
41
42 /* We are being asked if the directory ("name") is worth
43 * descending into.
44 *
45 * Find the longest leading directory name that does
46 * not have metacharacter in the pathspec; the name
47 * we are looking at must overlap with that directory.
48 */
49 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
50 char ch = *cp;
51 if (ch == '*' || ch == '[' || ch == '?') {
52 meta = cp;
53 break;
54 }
55 }
56 if (!meta)
57 meta = cp; /* fully literal */
58
59 if (namelen <= meta - match) {
60 /* Looking at "Documentation/" and
61 * the pattern says "Documentation/howto/", or
62 * "Documentation/diff*.txt". The name we
63 * have should match prefix.
64 */
65 if (!memcmp(match, name, namelen))
66 return 1;
67 continue;
68 }
69
70 if (meta - match < namelen) {
71 /* Looking at "Documentation/howto/" and
72 * the pattern says "Documentation/h*";
73 * match up to "Do.../h"; this avoids descending
74 * into "Documentation/technical/".
75 */
76 if (!memcmp(match, name, meta - match))
77 return 1;
78 continue;
79 }
80 }
81 return 0;
82 }
83
84 struct grep_pat {
85 struct grep_pat *next;
86 const char *origin;
87 int no;
88 const char *pattern;
89 regex_t regexp;
90 };
91
92 struct grep_opt {
93 struct grep_pat *pattern_list;
94 struct grep_pat **pattern_tail;
95 regex_t regexp;
96 unsigned linenum:1;
97 unsigned invert:1;
98 unsigned name_only:1;
99 unsigned unmatch_name_only:1;
100 unsigned count:1;
101 unsigned word_regexp:1;
102 unsigned fixed:1;
103 #define GREP_BINARY_DEFAULT 0
104 #define GREP_BINARY_NOMATCH 1
105 #define GREP_BINARY_TEXT 2
106 unsigned binary:2;
107 int regflags;
108 unsigned pre_context;
109 unsigned post_context;
110 };
111
112 static void add_pattern(struct grep_opt *opt, const char *pat,
113 const char *origin, int no)
114 {
115 struct grep_pat *p = xcalloc(1, sizeof(*p));
116 p->pattern = pat;
117 p->origin = origin;
118 p->no = no;
119 *opt->pattern_tail = p;
120 opt->pattern_tail = &p->next;
121 p->next = NULL;
122 }
123
124 static void compile_patterns(struct grep_opt *opt)
125 {
126 struct grep_pat *p;
127 for (p = opt->pattern_list; p; p = p->next) {
128 int err = regcomp(&p->regexp, p->pattern, opt->regflags);
129 if (err) {
130 char errbuf[1024];
131 char where[1024];
132 if (p->no)
133 sprintf(where, "In '%s' at %d, ",
134 p->origin, p->no);
135 else if (p->origin)
136 sprintf(where, "%s, ", p->origin);
137 else
138 where[0] = 0;
139 regerror(err, &p->regexp, errbuf, 1024);
140 regfree(&p->regexp);
141 die("%s'%s': %s", where, p->pattern, errbuf);
142 }
143 }
144 }
145
146 static char *end_of_line(char *cp, unsigned long *left)
147 {
148 unsigned long l = *left;
149 while (l && *cp != '\n') {
150 l--;
151 cp++;
152 }
153 *left = l;
154 return cp;
155 }
156
157 static int word_char(char ch)
158 {
159 return isalnum(ch) || ch == '_';
160 }
161
162 static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
163 const char *name, unsigned lno, char sign)
164 {
165 printf("%s%c", name, sign);
166 if (opt->linenum)
167 printf("%d%c", lno, sign);
168 printf("%.*s\n", (int)(eol-bol), bol);
169 }
170
171 /*
172 * NEEDSWORK: share code with diff.c
173 */
174 #define FIRST_FEW_BYTES 8000
175 static int buffer_is_binary(const char *ptr, unsigned long size)
176 {
177 if (FIRST_FEW_BYTES < size)
178 size = FIRST_FEW_BYTES;
179 if (memchr(ptr, 0, size))
180 return 1;
181 return 0;
182 }
183
184 static int fixmatch(const char *pattern, char *line, regmatch_t *match)
185 {
186 char *hit = strstr(line, pattern);
187 if (!hit) {
188 match->rm_so = match->rm_eo = -1;
189 return REG_NOMATCH;
190 }
191 else {
192 match->rm_so = hit - line;
193 match->rm_eo = match->rm_so + strlen(pattern);
194 return 0;
195 }
196 }
197
198 static int grep_buffer(struct grep_opt *opt, const char *name,
199 char *buf, unsigned long size)
200 {
201 char *bol = buf;
202 unsigned long left = size;
203 unsigned lno = 1;
204 struct pre_context_line {
205 char *bol;
206 char *eol;
207 } *prev = NULL, *pcl;
208 unsigned last_hit = 0;
209 unsigned last_shown = 0;
210 int binary_match_only = 0;
211 const char *hunk_mark = "";
212 unsigned count = 0;
213
214 if (buffer_is_binary(buf, size)) {
215 switch (opt->binary) {
216 case GREP_BINARY_DEFAULT:
217 binary_match_only = 1;
218 break;
219 case GREP_BINARY_NOMATCH:
220 return 0; /* Assume unmatch */
221 break;
222 default:
223 break;
224 }
225 }
226
227 if (opt->pre_context)
228 prev = xcalloc(opt->pre_context, sizeof(*prev));
229 if (opt->pre_context || opt->post_context)
230 hunk_mark = "--\n";
231
232 while (left) {
233 regmatch_t pmatch[10];
234 char *eol, ch;
235 int hit = 0;
236 struct grep_pat *p;
237
238 eol = end_of_line(bol, &left);
239 ch = *eol;
240 *eol = 0;
241
242 for (p = opt->pattern_list; p; p = p->next) {
243 if (!opt->fixed) {
244 regex_t *exp = &p->regexp;
245 hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
246 pmatch, 0);
247 }
248 else {
249 hit = !fixmatch(p->pattern, bol, pmatch);
250 }
251
252 if (hit && opt->word_regexp) {
253 /* Match beginning must be either
254 * beginning of the line, or at word
255 * boundary (i.e. the last char must
256 * not be alnum or underscore).
257 */
258 if ((pmatch[0].rm_so < 0) ||
259 (eol - bol) <= pmatch[0].rm_so ||
260 (pmatch[0].rm_eo < 0) ||
261 (eol - bol) < pmatch[0].rm_eo)
262 die("regexp returned nonsense");
263 if (pmatch[0].rm_so != 0 &&
264 word_char(bol[pmatch[0].rm_so-1]))
265 hit = 0;
266 if (pmatch[0].rm_eo != (eol-bol) &&
267 word_char(bol[pmatch[0].rm_eo]))
268 hit = 0;
269 }
270 if (hit)
271 break;
272 }
273 /* "grep -v -e foo -e bla" should list lines
274 * that do not have either, so inversion should
275 * be done outside.
276 */
277 if (opt->invert)
278 hit = !hit;
279 if (opt->unmatch_name_only) {
280 if (hit)
281 return 0;
282 goto next_line;
283 }
284 if (hit) {
285 count++;
286 if (binary_match_only) {
287 printf("Binary file %s matches\n", name);
288 return 1;
289 }
290 if (opt->name_only) {
291 printf("%s\n", name);
292 return 1;
293 }
294 /* Hit at this line. If we haven't shown the
295 * pre-context lines, we would need to show them.
296 * When asked to do "count", this still show
297 * the context which is nonsense, but the user
298 * deserves to get that ;-).
299 */
300 if (opt->pre_context) {
301 unsigned from;
302 if (opt->pre_context < lno)
303 from = lno - opt->pre_context;
304 else
305 from = 1;
306 if (from <= last_shown)
307 from = last_shown + 1;
308 if (last_shown && from != last_shown + 1)
309 printf(hunk_mark);
310 while (from < lno) {
311 pcl = &prev[lno-from-1];
312 show_line(opt, pcl->bol, pcl->eol,
313 name, from, '-');
314 from++;
315 }
316 last_shown = lno-1;
317 }
318 if (last_shown && lno != last_shown + 1)
319 printf(hunk_mark);
320 if (!opt->count)
321 show_line(opt, bol, eol, name, lno, ':');
322 last_shown = last_hit = lno;
323 }
324 else if (last_hit &&
325 lno <= last_hit + opt->post_context) {
326 /* If the last hit is within the post context,
327 * we need to show this line.
328 */
329 if (last_shown && lno != last_shown + 1)
330 printf(hunk_mark);
331 show_line(opt, bol, eol, name, lno, '-');
332 last_shown = lno;
333 }
334 if (opt->pre_context) {
335 memmove(prev+1, prev,
336 (opt->pre_context-1) * sizeof(*prev));
337 prev->bol = bol;
338 prev->eol = eol;
339 }
340
341 next_line:
342 *eol = ch;
343 bol = eol + 1;
344 if (!left)
345 break;
346 left--;
347 lno++;
348 }
349
350 if (opt->unmatch_name_only) {
351 /* We did not see any hit, so we want to show this */
352 printf("%s\n", name);
353 return 1;
354 }
355
356 /* NEEDSWORK:
357 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
358 * which feels mostly useless but sometimes useful. Maybe
359 * make it another option? For now suppress them.
360 */
361 if (opt->count && count)
362 printf("%s:%u\n", name, count);
363 return !!last_hit;
364 }
365
366 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
367 {
368 unsigned long size;
369 char *data;
370 char type[20];
371 int hit;
372 data = read_sha1_file(sha1, type, &size);
373 if (!data) {
374 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
375 return 0;
376 }
377 hit = grep_buffer(opt, name, data, size);
378 free(data);
379 return hit;
380 }
381
382 static int grep_file(struct grep_opt *opt, const char *filename)
383 {
384 struct stat st;
385 int i;
386 char *data;
387 if (lstat(filename, &st) < 0) {
388 err_ret:
389 if (errno != ENOENT)
390 error("'%s': %s", filename, strerror(errno));
391 return 0;
392 }
393 if (!st.st_size)
394 return 0; /* empty file -- no grep hit */
395 if (!S_ISREG(st.st_mode))
396 return 0;
397 i = open(filename, O_RDONLY);
398 if (i < 0)
399 goto err_ret;
400 data = xmalloc(st.st_size + 1);
401 if (st.st_size != xread(i, data, st.st_size)) {
402 error("'%s': short read %s", filename, strerror(errno));
403 close(i);
404 free(data);
405 return 0;
406 }
407 close(i);
408 i = grep_buffer(opt, filename, data, st.st_size);
409 free(data);
410 return i;
411 }
412
413 static int exec_grep(int argc, const char **argv)
414 {
415 pid_t pid;
416 int status;
417
418 argv[argc] = NULL;
419 pid = fork();
420 if (pid < 0)
421 return pid;
422 if (!pid) {
423 execvp("grep", (char **) argv);
424 exit(255);
425 }
426 while (waitpid(pid, &status, 0) < 0) {
427 if (errno == EINTR)
428 continue;
429 return -1;
430 }
431 if (WIFEXITED(status)) {
432 if (!WEXITSTATUS(status))
433 return 1;
434 return 0;
435 }
436 return -1;
437 }
438
439 #define MAXARGS 1000
440 #define ARGBUF 4096
441 #define push_arg(a) do { \
442 if (nr < MAXARGS) argv[nr++] = (a); \
443 else die("maximum number of args exceeded"); \
444 } while (0)
445
446 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
447 {
448 int i, nr, argc, hit, len;
449 const char *argv[MAXARGS+1];
450 char randarg[ARGBUF];
451 char *argptr = randarg;
452 struct grep_pat *p;
453
454 len = nr = 0;
455 push_arg("grep");
456 if (opt->fixed)
457 push_arg("-F");
458 if (opt->linenum)
459 push_arg("-n");
460 if (opt->regflags & REG_EXTENDED)
461 push_arg("-E");
462 if (opt->word_regexp)
463 push_arg("-w");
464 if (opt->name_only)
465 push_arg("-l");
466 if (opt->unmatch_name_only)
467 push_arg("-L");
468 if (opt->count)
469 push_arg("-c");
470 if (opt->post_context || opt->pre_context) {
471 if (opt->post_context != opt->pre_context) {
472 if (opt->pre_context) {
473 push_arg("-B");
474 len += snprintf(argptr, sizeof(randarg)-len,
475 "%u", opt->pre_context);
476 if (sizeof(randarg) <= len)
477 die("maximum length of args exceeded");
478 push_arg(argptr);
479 argptr += len;
480 }
481 if (opt->post_context) {
482 push_arg("-A");
483 len += snprintf(argptr, sizeof(randarg)-len,
484 "%u", opt->post_context);
485 if (sizeof(randarg) <= len)
486 die("maximum length of args exceeded");
487 push_arg(argptr);
488 argptr += len;
489 }
490 }
491 else {
492 push_arg("-C");
493 len += snprintf(argptr, sizeof(randarg)-len,
494 "%u", opt->post_context);
495 if (sizeof(randarg) <= len)
496 die("maximum length of args exceeded");
497 push_arg(argptr);
498 argptr += len;
499 }
500 }
501 for (p = opt->pattern_list; p; p = p->next) {
502 push_arg("-e");
503 push_arg(p->pattern);
504 }
505
506 /*
507 * To make sure we get the header printed out when we want it,
508 * add /dev/null to the paths to grep. This is unnecessary
509 * (and wrong) with "-l" or "-L", which always print out the
510 * name anyway.
511 *
512 * GNU grep has "-H", but this is portable.
513 */
514 if (!opt->name_only && !opt->unmatch_name_only)
515 push_arg("/dev/null");
516
517 hit = 0;
518 argc = nr;
519 for (i = 0; i < active_nr; i++) {
520 struct cache_entry *ce = active_cache[i];
521 char *name;
522 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
523 continue;
524 if (!pathspec_matches(paths, ce->name))
525 continue;
526 name = ce->name;
527 if (name[0] == '-') {
528 int len = ce_namelen(ce);
529 name = xmalloc(len + 3);
530 memcpy(name, "./", 2);
531 memcpy(name + 2, ce->name, len + 1);
532 }
533 argv[argc++] = name;
534 if (argc < MAXARGS)
535 continue;
536 hit += exec_grep(argc, argv);
537 argc = nr;
538 }
539 if (argc > nr)
540 hit += exec_grep(argc, argv);
541 return 0;
542 }
543
544 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
545 {
546 int hit = 0;
547 int nr;
548 read_cache();
549
550 #ifdef __unix__
551 /*
552 * Use the external "grep" command for the case where
553 * we grep through the checked-out files. It tends to
554 * be a lot more optimized
555 */
556 if (!cached) {
557 hit = external_grep(opt, paths, cached);
558 if (hit >= 0)
559 return hit;
560 }
561 #endif
562
563 for (nr = 0; nr < active_nr; nr++) {
564 struct cache_entry *ce = active_cache[nr];
565 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
566 continue;
567 if (!pathspec_matches(paths, ce->name))
568 continue;
569 if (cached)
570 hit |= grep_sha1(opt, ce->sha1, ce->name);
571 else
572 hit |= grep_file(opt, ce->name);
573 }
574 return hit;
575 }
576
577 static int grep_tree(struct grep_opt *opt, const char **paths,
578 struct tree_desc *tree,
579 const char *tree_name, const char *base)
580 {
581 int len;
582 int hit = 0;
583 struct name_entry entry;
584 char *down;
585 char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
586
587 if (tree_name[0]) {
588 int offset = sprintf(path_buf, "%s:", tree_name);
589 down = path_buf + offset;
590 strcat(down, base);
591 }
592 else {
593 down = path_buf;
594 strcpy(down, base);
595 }
596 len = strlen(path_buf);
597
598 while (tree_entry(tree, &entry)) {
599 strcpy(path_buf + len, entry.path);
600
601 if (S_ISDIR(entry.mode))
602 /* Match "abc/" against pathspec to
603 * decide if we want to descend into "abc"
604 * directory.
605 */
606 strcpy(path_buf + len + entry.pathlen, "/");
607
608 if (!pathspec_matches(paths, down))
609 ;
610 else if (S_ISREG(entry.mode))
611 hit |= grep_sha1(opt, entry.sha1, path_buf);
612 else if (S_ISDIR(entry.mode)) {
613 char type[20];
614 struct tree_desc sub;
615 void *data;
616 data = read_sha1_file(entry.sha1, type, &sub.size);
617 if (!data)
618 die("unable to read tree (%s)",
619 sha1_to_hex(entry.sha1));
620 sub.buf = data;
621 hit |= grep_tree(opt, paths, &sub, tree_name, down);
622 free(data);
623 }
624 }
625 return hit;
626 }
627
628 static int grep_object(struct grep_opt *opt, const char **paths,
629 struct object *obj, const char *name)
630 {
631 if (!strcmp(obj->type, blob_type))
632 return grep_sha1(opt, obj->sha1, name);
633 if (!strcmp(obj->type, commit_type) ||
634 !strcmp(obj->type, tree_type)) {
635 struct tree_desc tree;
636 void *data;
637 int hit;
638 data = read_object_with_reference(obj->sha1, tree_type,
639 &tree.size, NULL);
640 if (!data)
641 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
642 tree.buf = data;
643 hit = grep_tree(opt, paths, &tree, name, "");
644 free(data);
645 return hit;
646 }
647 die("unable to grep from object of type %s", obj->type);
648 }
649
650 static const char builtin_grep_usage[] =
651 "git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
652
653 int cmd_grep(int argc, const char **argv, char **envp)
654 {
655 int hit = 0;
656 int cached = 0;
657 int seen_dashdash = 0;
658 struct grep_opt opt;
659 struct object_list *list, **tail, *object_list = NULL;
660 const char *prefix = setup_git_directory();
661 const char **paths = NULL;
662 int i;
663
664 memset(&opt, 0, sizeof(opt));
665 opt.pattern_tail = &opt.pattern_list;
666 opt.regflags = REG_NEWLINE;
667
668 /*
669 * If there is no -- then the paths must exist in the working
670 * tree. If there is no explicit pattern specified with -e or
671 * -f, we take the first unrecognized non option to be the
672 * pattern, but then what follows it must be zero or more
673 * valid refs up to the -- (if exists), and then existing
674 * paths. If there is an explicit pattern, then the first
675 * unrecocnized non option is the beginning of the refs list
676 * that continues up to the -- (if exists), and then paths.
677 */
678
679 tail = &object_list;
680 while (1 < argc) {
681 const char *arg = argv[1];
682 argc--; argv++;
683 if (!strcmp("--cached", arg)) {
684 cached = 1;
685 continue;
686 }
687 if (!strcmp("-a", arg) ||
688 !strcmp("--text", arg)) {
689 opt.binary = GREP_BINARY_TEXT;
690 continue;
691 }
692 if (!strcmp("-i", arg) ||
693 !strcmp("--ignore-case", arg)) {
694 opt.regflags |= REG_ICASE;
695 continue;
696 }
697 if (!strcmp("-I", arg)) {
698 opt.binary = GREP_BINARY_NOMATCH;
699 continue;
700 }
701 if (!strcmp("-v", arg) ||
702 !strcmp("--invert-match", arg)) {
703 opt.invert = 1;
704 continue;
705 }
706 if (!strcmp("-E", arg) ||
707 !strcmp("--extended-regexp", arg)) {
708 opt.regflags |= REG_EXTENDED;
709 continue;
710 }
711 if (!strcmp("-F", arg) ||
712 !strcmp("--fixed-strings", arg)) {
713 opt.fixed = 1;
714 continue;
715 }
716 if (!strcmp("-G", arg) ||
717 !strcmp("--basic-regexp", arg)) {
718 opt.regflags &= ~REG_EXTENDED;
719 continue;
720 }
721 if (!strcmp("-n", arg)) {
722 opt.linenum = 1;
723 continue;
724 }
725 if (!strcmp("-H", arg)) {
726 /* We always show the pathname, so this
727 * is a noop.
728 */
729 continue;
730 }
731 if (!strcmp("-l", arg) ||
732 !strcmp("--files-with-matches", arg)) {
733 opt.name_only = 1;
734 continue;
735 }
736 if (!strcmp("-L", arg) ||
737 !strcmp("--files-without-match", arg)) {
738 opt.unmatch_name_only = 1;
739 continue;
740 }
741 if (!strcmp("-c", arg) ||
742 !strcmp("--count", arg)) {
743 opt.count = 1;
744 continue;
745 }
746 if (!strcmp("-w", arg) ||
747 !strcmp("--word-regexp", arg)) {
748 opt.word_regexp = 1;
749 continue;
750 }
751 if (!strncmp("-A", arg, 2) ||
752 !strncmp("-B", arg, 2) ||
753 !strncmp("-C", arg, 2) ||
754 (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
755 unsigned num;
756 const char *scan;
757 switch (arg[1]) {
758 case 'A': case 'B': case 'C':
759 if (!arg[2]) {
760 if (argc <= 1)
761 usage(builtin_grep_usage);
762 scan = *++argv;
763 argc--;
764 }
765 else
766 scan = arg + 2;
767 break;
768 default:
769 scan = arg + 1;
770 break;
771 }
772 if (sscanf(scan, "%u", &num) != 1)
773 usage(builtin_grep_usage);
774 switch (arg[1]) {
775 case 'A':
776 opt.post_context = num;
777 break;
778 default:
779 case 'C':
780 opt.post_context = num;
781 case 'B':
782 opt.pre_context = num;
783 break;
784 }
785 continue;
786 }
787 if (!strcmp("-f", arg)) {
788 FILE *patterns;
789 int lno = 0;
790 char buf[1024];
791 if (argc <= 1)
792 usage(builtin_grep_usage);
793 patterns = fopen(argv[1], "r");
794 if (!patterns)
795 die("'%s': %s", argv[1], strerror(errno));
796 while (fgets(buf, sizeof(buf), patterns)) {
797 int len = strlen(buf);
798 if (buf[len-1] == '\n')
799 buf[len-1] = 0;
800 /* ignore empty line like grep does */
801 if (!buf[0])
802 continue;
803 add_pattern(&opt, strdup(buf), argv[1], ++lno);
804 }
805 fclose(patterns);
806 argv++;
807 argc--;
808 continue;
809 }
810 if (!strcmp("-e", arg)) {
811 if (1 < argc) {
812 add_pattern(&opt, argv[1], "-e option", 0);
813 argv++;
814 argc--;
815 continue;
816 }
817 usage(builtin_grep_usage);
818 }
819 if (!strcmp("--", arg))
820 break;
821 if (*arg == '-')
822 usage(builtin_grep_usage);
823
824 /* First unrecognized non-option token */
825 if (!opt.pattern_list) {
826 add_pattern(&opt, arg, "command line", 0);
827 break;
828 }
829 else {
830 /* We are looking at the first path or rev;
831 * it is found at argv[1] after leaving the
832 * loop.
833 */
834 argc++; argv--;
835 break;
836 }
837 }
838
839 if (!opt.pattern_list)
840 die("no pattern given.");
841 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
842 die("cannot mix --fixed-strings and regexp");
843 if (!opt.fixed)
844 compile_patterns(&opt);
845
846 /* Check revs and then paths */
847 for (i = 1; i < argc; i++) {
848 const char *arg = argv[i];
849 unsigned char sha1[20];
850 /* Is it a rev? */
851 if (!get_sha1(arg, sha1)) {
852 struct object *object = parse_object(sha1);
853 struct object_list *elem;
854 if (!object)
855 die("bad object %s", arg);
856 elem = object_list_insert(object, tail);
857 elem->name = arg;
858 tail = &elem->next;
859 continue;
860 }
861 if (!strcmp(arg, "--")) {
862 i++;
863 seen_dashdash = 1;
864 }
865 break;
866 }
867
868 /* The rest are paths */
869 if (!seen_dashdash) {
870 int j;
871 for (j = i; j < argc; j++)
872 verify_filename(prefix, argv[j]);
873 }
874
875 if (i < argc)
876 paths = get_pathspec(prefix, argv + i);
877 else if (prefix) {
878 paths = xcalloc(2, sizeof(const char *));
879 paths[0] = prefix;
880 paths[1] = NULL;
881 }
882
883 if (!object_list)
884 return !grep_cache(&opt, paths, cached);
885
886 if (cached)
887 die("both --cached and trees are given.");
888
889 for (list = object_list; list; list = list->next) {
890 struct object *real_obj;
891 real_obj = deref_tag(list->item, NULL, 0);
892 if (grep_object(&opt, paths, real_obj, list->name))
893 hit = 1;
894 }
895 return !hit;
896 }