Remove TYPE_* constant macros and use object_type enums consistently.
[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 enum grep_pat_token {
86 GREP_PATTERN,
87 GREP_AND,
88 GREP_OPEN_PAREN,
89 GREP_CLOSE_PAREN,
90 GREP_NOT,
91 GREP_OR,
92 };
93
94 struct grep_pat {
95 struct grep_pat *next;
96 const char *origin;
97 int no;
98 enum grep_pat_token token;
99 const char *pattern;
100 regex_t regexp;
101 };
102
103 enum grep_expr_node {
104 GREP_NODE_ATOM,
105 GREP_NODE_NOT,
106 GREP_NODE_AND,
107 GREP_NODE_OR,
108 };
109
110 struct grep_expr {
111 enum grep_expr_node node;
112 union {
113 struct grep_pat *atom;
114 struct grep_expr *unary;
115 struct {
116 struct grep_expr *left;
117 struct grep_expr *right;
118 } binary;
119 } u;
120 };
121
122 struct grep_opt {
123 struct grep_pat *pattern_list;
124 struct grep_pat **pattern_tail;
125 struct grep_expr *pattern_expression;
126 regex_t regexp;
127 unsigned linenum:1;
128 unsigned invert:1;
129 unsigned name_only:1;
130 unsigned unmatch_name_only:1;
131 unsigned count:1;
132 unsigned word_regexp:1;
133 unsigned fixed:1;
134 #define GREP_BINARY_DEFAULT 0
135 #define GREP_BINARY_NOMATCH 1
136 #define GREP_BINARY_TEXT 2
137 unsigned binary:2;
138 unsigned extended:1;
139 int regflags;
140 unsigned pre_context;
141 unsigned post_context;
142 };
143
144 static void add_pattern(struct grep_opt *opt, const char *pat,
145 const char *origin, int no, enum grep_pat_token t)
146 {
147 struct grep_pat *p = xcalloc(1, sizeof(*p));
148 p->pattern = pat;
149 p->origin = origin;
150 p->no = no;
151 p->token = t;
152 *opt->pattern_tail = p;
153 opt->pattern_tail = &p->next;
154 p->next = NULL;
155 }
156
157 static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
158 {
159 int err = regcomp(&p->regexp, p->pattern, opt->regflags);
160 if (err) {
161 char errbuf[1024];
162 char where[1024];
163 if (p->no)
164 sprintf(where, "In '%s' at %d, ",
165 p->origin, p->no);
166 else if (p->origin)
167 sprintf(where, "%s, ", p->origin);
168 else
169 where[0] = 0;
170 regerror(err, &p->regexp, errbuf, 1024);
171 regfree(&p->regexp);
172 die("%s'%s': %s", where, p->pattern, errbuf);
173 }
174 }
175
176 #if DEBUG
177 static inline void indent(int in)
178 {
179 int i;
180 for (i = 0; i < in; i++) putchar(' ');
181 }
182
183 static void dump_pattern_exp(struct grep_expr *x, int in)
184 {
185 switch (x->node) {
186 case GREP_NODE_ATOM:
187 indent(in);
188 puts(x->u.atom->pattern);
189 break;
190 case GREP_NODE_NOT:
191 indent(in);
192 puts("--not");
193 dump_pattern_exp(x->u.unary, in+1);
194 break;
195 case GREP_NODE_AND:
196 dump_pattern_exp(x->u.binary.left, in+1);
197 indent(in);
198 puts("--and");
199 dump_pattern_exp(x->u.binary.right, in+1);
200 break;
201 case GREP_NODE_OR:
202 dump_pattern_exp(x->u.binary.left, in+1);
203 indent(in);
204 puts("--or");
205 dump_pattern_exp(x->u.binary.right, in+1);
206 break;
207 }
208 }
209
210 static void looking_at(const char *msg, struct grep_pat **list)
211 {
212 struct grep_pat *p = *list;
213 fprintf(stderr, "%s: looking at ", msg);
214 if (!p)
215 fprintf(stderr, "empty\n");
216 else
217 fprintf(stderr, "<%s>\n", p->pattern);
218 }
219 #else
220 #define looking_at(a,b) do {} while(0)
221 #endif
222
223 static struct grep_expr *compile_pattern_expr(struct grep_pat **);
224 static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
225 {
226 struct grep_pat *p;
227 struct grep_expr *x;
228
229 looking_at("atom", list);
230
231 p = *list;
232 switch (p->token) {
233 case GREP_PATTERN: /* atom */
234 x = xcalloc(1, sizeof (struct grep_expr));
235 x->node = GREP_NODE_ATOM;
236 x->u.atom = p;
237 *list = p->next;
238 return x;
239 case GREP_OPEN_PAREN:
240 *list = p->next;
241 x = compile_pattern_expr(list);
242 if (!x)
243 return NULL;
244 if (!*list || (*list)->token != GREP_CLOSE_PAREN)
245 die("unmatched parenthesis");
246 *list = (*list)->next;
247 return x;
248 default:
249 return NULL;
250 }
251 }
252
253 static struct grep_expr *compile_pattern_not(struct grep_pat **list)
254 {
255 struct grep_pat *p;
256 struct grep_expr *x;
257
258 looking_at("not", list);
259
260 p = *list;
261 switch (p->token) {
262 case GREP_NOT:
263 if (!p->next)
264 die("--not not followed by pattern expression");
265 *list = p->next;
266 x = xcalloc(1, sizeof (struct grep_expr));
267 x->node = GREP_NODE_NOT;
268 x->u.unary = compile_pattern_not(list);
269 if (!x->u.unary)
270 die("--not followed by non pattern expression");
271 return x;
272 default:
273 return compile_pattern_atom(list);
274 }
275 }
276
277 static struct grep_expr *compile_pattern_and(struct grep_pat **list)
278 {
279 struct grep_pat *p;
280 struct grep_expr *x, *y, *z;
281
282 looking_at("and", list);
283
284 x = compile_pattern_not(list);
285 p = *list;
286 if (p && p->token == GREP_AND) {
287 if (!p->next)
288 die("--and not followed by pattern expression");
289 *list = p->next;
290 y = compile_pattern_and(list);
291 if (!y)
292 die("--and not followed by pattern expression");
293 z = xcalloc(1, sizeof (struct grep_expr));
294 z->node = GREP_NODE_AND;
295 z->u.binary.left = x;
296 z->u.binary.right = y;
297 return z;
298 }
299 return x;
300 }
301
302 static struct grep_expr *compile_pattern_or(struct grep_pat **list)
303 {
304 struct grep_pat *p;
305 struct grep_expr *x, *y, *z;
306
307 looking_at("or", list);
308
309 x = compile_pattern_and(list);
310 p = *list;
311 if (x && p && p->token != GREP_CLOSE_PAREN) {
312 y = compile_pattern_or(list);
313 if (!y)
314 die("not a pattern expression %s", p->pattern);
315 z = xcalloc(1, sizeof (struct grep_expr));
316 z->node = GREP_NODE_OR;
317 z->u.binary.left = x;
318 z->u.binary.right = y;
319 return z;
320 }
321 return x;
322 }
323
324 static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
325 {
326 looking_at("expr", list);
327
328 return compile_pattern_or(list);
329 }
330
331 static void compile_patterns(struct grep_opt *opt)
332 {
333 struct grep_pat *p;
334
335 /* First compile regexps */
336 for (p = opt->pattern_list; p; p = p->next) {
337 if (p->token == GREP_PATTERN)
338 compile_regexp(p, opt);
339 else
340 opt->extended = 1;
341 }
342
343 if (!opt->extended)
344 return;
345
346 /* Then bundle them up in an expression.
347 * A classic recursive descent parser would do.
348 */
349 p = opt->pattern_list;
350 opt->pattern_expression = compile_pattern_expr(&p);
351 #if DEBUG
352 dump_pattern_exp(opt->pattern_expression, 0);
353 #endif
354 if (p)
355 die("incomplete pattern expression: %s", p->pattern);
356 }
357
358 static char *end_of_line(char *cp, unsigned long *left)
359 {
360 unsigned long l = *left;
361 while (l && *cp != '\n') {
362 l--;
363 cp++;
364 }
365 *left = l;
366 return cp;
367 }
368
369 static int word_char(char ch)
370 {
371 return isalnum(ch) || ch == '_';
372 }
373
374 static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
375 const char *name, unsigned lno, char sign)
376 {
377 printf("%s%c", name, sign);
378 if (opt->linenum)
379 printf("%d%c", lno, sign);
380 printf("%.*s\n", (int)(eol-bol), bol);
381 }
382
383 /*
384 * NEEDSWORK: share code with diff.c
385 */
386 #define FIRST_FEW_BYTES 8000
387 static int buffer_is_binary(const char *ptr, unsigned long size)
388 {
389 if (FIRST_FEW_BYTES < size)
390 size = FIRST_FEW_BYTES;
391 if (memchr(ptr, 0, size))
392 return 1;
393 return 0;
394 }
395
396 static int fixmatch(const char *pattern, char *line, regmatch_t *match)
397 {
398 char *hit = strstr(line, pattern);
399 if (!hit) {
400 match->rm_so = match->rm_eo = -1;
401 return REG_NOMATCH;
402 }
403 else {
404 match->rm_so = hit - line;
405 match->rm_eo = match->rm_so + strlen(pattern);
406 return 0;
407 }
408 }
409
410 static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol)
411 {
412 int hit = 0;
413 regmatch_t pmatch[10];
414
415 if (!opt->fixed) {
416 regex_t *exp = &p->regexp;
417 hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
418 pmatch, 0);
419 }
420 else {
421 hit = !fixmatch(p->pattern, bol, pmatch);
422 }
423
424 if (hit && opt->word_regexp) {
425 /* Match beginning must be either
426 * beginning of the line, or at word
427 * boundary (i.e. the last char must
428 * not be alnum or underscore).
429 */
430 if ((pmatch[0].rm_so < 0) ||
431 (eol - bol) <= pmatch[0].rm_so ||
432 (pmatch[0].rm_eo < 0) ||
433 (eol - bol) < pmatch[0].rm_eo)
434 die("regexp returned nonsense");
435 if (pmatch[0].rm_so != 0 &&
436 word_char(bol[pmatch[0].rm_so-1]))
437 hit = 0;
438 if (pmatch[0].rm_eo != (eol-bol) &&
439 word_char(bol[pmatch[0].rm_eo]))
440 hit = 0;
441 }
442 return hit;
443 }
444
445 static int match_expr_eval(struct grep_opt *opt,
446 struct grep_expr *x,
447 char *bol, char *eol)
448 {
449 switch (x->node) {
450 case GREP_NODE_ATOM:
451 return match_one_pattern(opt, x->u.atom, bol, eol);
452 break;
453 case GREP_NODE_NOT:
454 return !match_expr_eval(opt, x->u.unary, bol, eol);
455 case GREP_NODE_AND:
456 return (match_expr_eval(opt, x->u.binary.left, bol, eol) &&
457 match_expr_eval(opt, x->u.binary.right, bol, eol));
458 case GREP_NODE_OR:
459 return (match_expr_eval(opt, x->u.binary.left, bol, eol) ||
460 match_expr_eval(opt, x->u.binary.right, bol, eol));
461 }
462 die("Unexpected node type (internal error) %d\n", x->node);
463 }
464
465 static int match_expr(struct grep_opt *opt, char *bol, char *eol)
466 {
467 struct grep_expr *x = opt->pattern_expression;
468 return match_expr_eval(opt, x, bol, eol);
469 }
470
471 static int match_line(struct grep_opt *opt, char *bol, char *eol)
472 {
473 struct grep_pat *p;
474 if (opt->extended)
475 return match_expr(opt, bol, eol);
476 for (p = opt->pattern_list; p; p = p->next) {
477 if (match_one_pattern(opt, p, bol, eol))
478 return 1;
479 }
480 return 0;
481 }
482
483 static int grep_buffer(struct grep_opt *opt, const char *name,
484 char *buf, unsigned long size)
485 {
486 char *bol = buf;
487 unsigned long left = size;
488 unsigned lno = 1;
489 struct pre_context_line {
490 char *bol;
491 char *eol;
492 } *prev = NULL, *pcl;
493 unsigned last_hit = 0;
494 unsigned last_shown = 0;
495 int binary_match_only = 0;
496 const char *hunk_mark = "";
497 unsigned count = 0;
498
499 if (buffer_is_binary(buf, size)) {
500 switch (opt->binary) {
501 case GREP_BINARY_DEFAULT:
502 binary_match_only = 1;
503 break;
504 case GREP_BINARY_NOMATCH:
505 return 0; /* Assume unmatch */
506 break;
507 default:
508 break;
509 }
510 }
511
512 if (opt->pre_context)
513 prev = xcalloc(opt->pre_context, sizeof(*prev));
514 if (opt->pre_context || opt->post_context)
515 hunk_mark = "--\n";
516
517 while (left) {
518 char *eol, ch;
519 int hit = 0;
520
521 eol = end_of_line(bol, &left);
522 ch = *eol;
523 *eol = 0;
524
525 hit = match_line(opt, bol, eol);
526
527 /* "grep -v -e foo -e bla" should list lines
528 * that do not have either, so inversion should
529 * be done outside.
530 */
531 if (opt->invert)
532 hit = !hit;
533 if (opt->unmatch_name_only) {
534 if (hit)
535 return 0;
536 goto next_line;
537 }
538 if (hit) {
539 count++;
540 if (binary_match_only) {
541 printf("Binary file %s matches\n", name);
542 return 1;
543 }
544 if (opt->name_only) {
545 printf("%s\n", name);
546 return 1;
547 }
548 /* Hit at this line. If we haven't shown the
549 * pre-context lines, we would need to show them.
550 * When asked to do "count", this still show
551 * the context which is nonsense, but the user
552 * deserves to get that ;-).
553 */
554 if (opt->pre_context) {
555 unsigned from;
556 if (opt->pre_context < lno)
557 from = lno - opt->pre_context;
558 else
559 from = 1;
560 if (from <= last_shown)
561 from = last_shown + 1;
562 if (last_shown && from != last_shown + 1)
563 printf(hunk_mark);
564 while (from < lno) {
565 pcl = &prev[lno-from-1];
566 show_line(opt, pcl->bol, pcl->eol,
567 name, from, '-');
568 from++;
569 }
570 last_shown = lno-1;
571 }
572 if (last_shown && lno != last_shown + 1)
573 printf(hunk_mark);
574 if (!opt->count)
575 show_line(opt, bol, eol, name, lno, ':');
576 last_shown = last_hit = lno;
577 }
578 else if (last_hit &&
579 lno <= last_hit + opt->post_context) {
580 /* If the last hit is within the post context,
581 * we need to show this line.
582 */
583 if (last_shown && lno != last_shown + 1)
584 printf(hunk_mark);
585 show_line(opt, bol, eol, name, lno, '-');
586 last_shown = lno;
587 }
588 if (opt->pre_context) {
589 memmove(prev+1, prev,
590 (opt->pre_context-1) * sizeof(*prev));
591 prev->bol = bol;
592 prev->eol = eol;
593 }
594
595 next_line:
596 *eol = ch;
597 bol = eol + 1;
598 if (!left)
599 break;
600 left--;
601 lno++;
602 }
603
604 if (opt->unmatch_name_only) {
605 /* We did not see any hit, so we want to show this */
606 printf("%s\n", name);
607 return 1;
608 }
609
610 /* NEEDSWORK:
611 * The real "grep -c foo *.c" gives many "bar.c:0" lines,
612 * which feels mostly useless but sometimes useful. Maybe
613 * make it another option? For now suppress them.
614 */
615 if (opt->count && count)
616 printf("%s:%u\n", name, count);
617 return !!last_hit;
618 }
619
620 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name)
621 {
622 unsigned long size;
623 char *data;
624 char type[20];
625 int hit;
626 data = read_sha1_file(sha1, type, &size);
627 if (!data) {
628 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
629 return 0;
630 }
631 hit = grep_buffer(opt, name, data, size);
632 free(data);
633 return hit;
634 }
635
636 static int grep_file(struct grep_opt *opt, const char *filename)
637 {
638 struct stat st;
639 int i;
640 char *data;
641 if (lstat(filename, &st) < 0) {
642 err_ret:
643 if (errno != ENOENT)
644 error("'%s': %s", filename, strerror(errno));
645 return 0;
646 }
647 if (!st.st_size)
648 return 0; /* empty file -- no grep hit */
649 if (!S_ISREG(st.st_mode))
650 return 0;
651 i = open(filename, O_RDONLY);
652 if (i < 0)
653 goto err_ret;
654 data = xmalloc(st.st_size + 1);
655 if (st.st_size != xread(i, data, st.st_size)) {
656 error("'%s': short read %s", filename, strerror(errno));
657 close(i);
658 free(data);
659 return 0;
660 }
661 close(i);
662 i = grep_buffer(opt, filename, data, st.st_size);
663 free(data);
664 return i;
665 }
666
667 static int exec_grep(int argc, const char **argv)
668 {
669 pid_t pid;
670 int status;
671
672 argv[argc] = NULL;
673 pid = fork();
674 if (pid < 0)
675 return pid;
676 if (!pid) {
677 execvp("grep", (char **) argv);
678 exit(255);
679 }
680 while (waitpid(pid, &status, 0) < 0) {
681 if (errno == EINTR)
682 continue;
683 return -1;
684 }
685 if (WIFEXITED(status)) {
686 if (!WEXITSTATUS(status))
687 return 1;
688 return 0;
689 }
690 return -1;
691 }
692
693 #define MAXARGS 1000
694 #define ARGBUF 4096
695 #define push_arg(a) do { \
696 if (nr < MAXARGS) argv[nr++] = (a); \
697 else die("maximum number of args exceeded"); \
698 } while (0)
699
700 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
701 {
702 int i, nr, argc, hit, len, status;
703 const char *argv[MAXARGS+1];
704 char randarg[ARGBUF];
705 char *argptr = randarg;
706 struct grep_pat *p;
707
708 if (opt->extended)
709 return -1;
710 len = nr = 0;
711 push_arg("grep");
712 if (opt->fixed)
713 push_arg("-F");
714 if (opt->linenum)
715 push_arg("-n");
716 if (opt->regflags & REG_EXTENDED)
717 push_arg("-E");
718 if (opt->regflags & REG_ICASE)
719 push_arg("-i");
720 if (opt->word_regexp)
721 push_arg("-w");
722 if (opt->name_only)
723 push_arg("-l");
724 if (opt->unmatch_name_only)
725 push_arg("-L");
726 if (opt->count)
727 push_arg("-c");
728 if (opt->post_context || opt->pre_context) {
729 if (opt->post_context != opt->pre_context) {
730 if (opt->pre_context) {
731 push_arg("-B");
732 len += snprintf(argptr, sizeof(randarg)-len,
733 "%u", opt->pre_context);
734 if (sizeof(randarg) <= len)
735 die("maximum length of args exceeded");
736 push_arg(argptr);
737 argptr += len;
738 }
739 if (opt->post_context) {
740 push_arg("-A");
741 len += snprintf(argptr, sizeof(randarg)-len,
742 "%u", opt->post_context);
743 if (sizeof(randarg) <= len)
744 die("maximum length of args exceeded");
745 push_arg(argptr);
746 argptr += len;
747 }
748 }
749 else {
750 push_arg("-C");
751 len += snprintf(argptr, sizeof(randarg)-len,
752 "%u", opt->post_context);
753 if (sizeof(randarg) <= len)
754 die("maximum length of args exceeded");
755 push_arg(argptr);
756 argptr += len;
757 }
758 }
759 for (p = opt->pattern_list; p; p = p->next) {
760 push_arg("-e");
761 push_arg(p->pattern);
762 }
763
764 /*
765 * To make sure we get the header printed out when we want it,
766 * add /dev/null to the paths to grep. This is unnecessary
767 * (and wrong) with "-l" or "-L", which always print out the
768 * name anyway.
769 *
770 * GNU grep has "-H", but this is portable.
771 */
772 if (!opt->name_only && !opt->unmatch_name_only)
773 push_arg("/dev/null");
774
775 hit = 0;
776 argc = nr;
777 for (i = 0; i < active_nr; i++) {
778 struct cache_entry *ce = active_cache[i];
779 char *name;
780 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
781 continue;
782 if (!pathspec_matches(paths, ce->name))
783 continue;
784 name = ce->name;
785 if (name[0] == '-') {
786 int len = ce_namelen(ce);
787 name = xmalloc(len + 3);
788 memcpy(name, "./", 2);
789 memcpy(name + 2, ce->name, len + 1);
790 }
791 argv[argc++] = name;
792 if (argc < MAXARGS)
793 continue;
794 status = exec_grep(argc, argv);
795 if (0 < status)
796 hit = 1;
797 argc = nr;
798 }
799 if (argc > nr) {
800 status = exec_grep(argc, argv);
801 if (0 < status)
802 hit = 1;
803 }
804 return hit;
805 }
806
807 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
808 {
809 int hit = 0;
810 int nr;
811 read_cache();
812
813 #ifdef __unix__
814 /*
815 * Use the external "grep" command for the case where
816 * we grep through the checked-out files. It tends to
817 * be a lot more optimized
818 */
819 if (!cached) {
820 hit = external_grep(opt, paths, cached);
821 if (hit >= 0)
822 return hit;
823 }
824 #endif
825
826 for (nr = 0; nr < active_nr; nr++) {
827 struct cache_entry *ce = active_cache[nr];
828 if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode)))
829 continue;
830 if (!pathspec_matches(paths, ce->name))
831 continue;
832 if (cached)
833 hit |= grep_sha1(opt, ce->sha1, ce->name);
834 else
835 hit |= grep_file(opt, ce->name);
836 }
837 return hit;
838 }
839
840 static int grep_tree(struct grep_opt *opt, const char **paths,
841 struct tree_desc *tree,
842 const char *tree_name, const char *base)
843 {
844 int len;
845 int hit = 0;
846 struct name_entry entry;
847 char *down;
848 char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100);
849
850 if (tree_name[0]) {
851 int offset = sprintf(path_buf, "%s:", tree_name);
852 down = path_buf + offset;
853 strcat(down, base);
854 }
855 else {
856 down = path_buf;
857 strcpy(down, base);
858 }
859 len = strlen(path_buf);
860
861 while (tree_entry(tree, &entry)) {
862 strcpy(path_buf + len, entry.path);
863
864 if (S_ISDIR(entry.mode))
865 /* Match "abc/" against pathspec to
866 * decide if we want to descend into "abc"
867 * directory.
868 */
869 strcpy(path_buf + len + entry.pathlen, "/");
870
871 if (!pathspec_matches(paths, down))
872 ;
873 else if (S_ISREG(entry.mode))
874 hit |= grep_sha1(opt, entry.sha1, path_buf);
875 else if (S_ISDIR(entry.mode)) {
876 char type[20];
877 struct tree_desc sub;
878 void *data;
879 data = read_sha1_file(entry.sha1, type, &sub.size);
880 if (!data)
881 die("unable to read tree (%s)",
882 sha1_to_hex(entry.sha1));
883 sub.buf = data;
884 hit |= grep_tree(opt, paths, &sub, tree_name, down);
885 free(data);
886 }
887 }
888 return hit;
889 }
890
891 static int grep_object(struct grep_opt *opt, const char **paths,
892 struct object *obj, const char *name)
893 {
894 if (obj->type == OBJ_BLOB)
895 return grep_sha1(opt, obj->sha1, name);
896 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
897 struct tree_desc tree;
898 void *data;
899 int hit;
900 data = read_object_with_reference(obj->sha1, tree_type,
901 &tree.size, NULL);
902 if (!data)
903 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
904 tree.buf = data;
905 hit = grep_tree(opt, paths, &tree, name, "");
906 free(data);
907 return hit;
908 }
909 die("unable to grep from object of type %s", typename(obj->type));
910 }
911
912 static const char builtin_grep_usage[] =
913 "git-grep <option>* <rev>* [-e] <pattern> [<path>...]";
914
915 static const char emsg_invalid_context_len[] =
916 "%s: invalid context length argument";
917 static const char emsg_missing_context_len[] =
918 "missing context length argument";
919 static const char emsg_missing_argument[] =
920 "option requires an argument -%s";
921
922 int cmd_grep(int argc, const char **argv, char **envp)
923 {
924 int hit = 0;
925 int cached = 0;
926 int seen_dashdash = 0;
927 struct grep_opt opt;
928 struct object_array list = { 0, 0, NULL };
929 const char *prefix = setup_git_directory();
930 const char **paths = NULL;
931 int i;
932
933 memset(&opt, 0, sizeof(opt));
934 opt.pattern_tail = &opt.pattern_list;
935 opt.regflags = REG_NEWLINE;
936
937 /*
938 * If there is no -- then the paths must exist in the working
939 * tree. If there is no explicit pattern specified with -e or
940 * -f, we take the first unrecognized non option to be the
941 * pattern, but then what follows it must be zero or more
942 * valid refs up to the -- (if exists), and then existing
943 * paths. If there is an explicit pattern, then the first
944 * unrecognized non option is the beginning of the refs list
945 * that continues up to the -- (if exists), and then paths.
946 */
947
948 while (1 < argc) {
949 const char *arg = argv[1];
950 argc--; argv++;
951 if (!strcmp("--cached", arg)) {
952 cached = 1;
953 continue;
954 }
955 if (!strcmp("-a", arg) ||
956 !strcmp("--text", arg)) {
957 opt.binary = GREP_BINARY_TEXT;
958 continue;
959 }
960 if (!strcmp("-i", arg) ||
961 !strcmp("--ignore-case", arg)) {
962 opt.regflags |= REG_ICASE;
963 continue;
964 }
965 if (!strcmp("-I", arg)) {
966 opt.binary = GREP_BINARY_NOMATCH;
967 continue;
968 }
969 if (!strcmp("-v", arg) ||
970 !strcmp("--invert-match", arg)) {
971 opt.invert = 1;
972 continue;
973 }
974 if (!strcmp("-E", arg) ||
975 !strcmp("--extended-regexp", arg)) {
976 opt.regflags |= REG_EXTENDED;
977 continue;
978 }
979 if (!strcmp("-F", arg) ||
980 !strcmp("--fixed-strings", arg)) {
981 opt.fixed = 1;
982 continue;
983 }
984 if (!strcmp("-G", arg) ||
985 !strcmp("--basic-regexp", arg)) {
986 opt.regflags &= ~REG_EXTENDED;
987 continue;
988 }
989 if (!strcmp("-n", arg)) {
990 opt.linenum = 1;
991 continue;
992 }
993 if (!strcmp("-H", arg)) {
994 /* We always show the pathname, so this
995 * is a noop.
996 */
997 continue;
998 }
999 if (!strcmp("-l", arg) ||
1000 !strcmp("--files-with-matches", arg)) {
1001 opt.name_only = 1;
1002 continue;
1003 }
1004 if (!strcmp("-L", arg) ||
1005 !strcmp("--files-without-match", arg)) {
1006 opt.unmatch_name_only = 1;
1007 continue;
1008 }
1009 if (!strcmp("-c", arg) ||
1010 !strcmp("--count", arg)) {
1011 opt.count = 1;
1012 continue;
1013 }
1014 if (!strcmp("-w", arg) ||
1015 !strcmp("--word-regexp", arg)) {
1016 opt.word_regexp = 1;
1017 continue;
1018 }
1019 if (!strncmp("-A", arg, 2) ||
1020 !strncmp("-B", arg, 2) ||
1021 !strncmp("-C", arg, 2) ||
1022 (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
1023 unsigned num;
1024 const char *scan;
1025 switch (arg[1]) {
1026 case 'A': case 'B': case 'C':
1027 if (!arg[2]) {
1028 if (argc <= 1)
1029 die(emsg_missing_context_len);
1030 scan = *++argv;
1031 argc--;
1032 }
1033 else
1034 scan = arg + 2;
1035 break;
1036 default:
1037 scan = arg + 1;
1038 break;
1039 }
1040 if (sscanf(scan, "%u", &num) != 1)
1041 die(emsg_invalid_context_len, scan);
1042 switch (arg[1]) {
1043 case 'A':
1044 opt.post_context = num;
1045 break;
1046 default:
1047 case 'C':
1048 opt.post_context = num;
1049 case 'B':
1050 opt.pre_context = num;
1051 break;
1052 }
1053 continue;
1054 }
1055 if (!strcmp("-f", arg)) {
1056 FILE *patterns;
1057 int lno = 0;
1058 char buf[1024];
1059 if (argc <= 1)
1060 die(emsg_missing_argument, arg);
1061 patterns = fopen(argv[1], "r");
1062 if (!patterns)
1063 die("'%s': %s", argv[1], strerror(errno));
1064 while (fgets(buf, sizeof(buf), patterns)) {
1065 int len = strlen(buf);
1066 if (buf[len-1] == '\n')
1067 buf[len-1] = 0;
1068 /* ignore empty line like grep does */
1069 if (!buf[0])
1070 continue;
1071 add_pattern(&opt, strdup(buf), argv[1], ++lno,
1072 GREP_PATTERN);
1073 }
1074 fclose(patterns);
1075 argv++;
1076 argc--;
1077 continue;
1078 }
1079 if (!strcmp("--not", arg)) {
1080 add_pattern(&opt, arg, "command line", 0, GREP_NOT);
1081 continue;
1082 }
1083 if (!strcmp("--and", arg)) {
1084 add_pattern(&opt, arg, "command line", 0, GREP_AND);
1085 continue;
1086 }
1087 if (!strcmp("--or", arg))
1088 continue; /* no-op */
1089 if (!strcmp("(", arg)) {
1090 add_pattern(&opt, arg, "command line", 0, GREP_OPEN_PAREN);
1091 continue;
1092 }
1093 if (!strcmp(")", arg)) {
1094 add_pattern(&opt, arg, "command line", 0, GREP_CLOSE_PAREN);
1095 continue;
1096 }
1097 if (!strcmp("-e", arg)) {
1098 if (1 < argc) {
1099 add_pattern(&opt, argv[1], "-e option", 0,
1100 GREP_PATTERN);
1101 argv++;
1102 argc--;
1103 continue;
1104 }
1105 die(emsg_missing_argument, arg);
1106 }
1107 if (!strcmp("--", arg)) {
1108 /* later processing wants to have this at argv[1] */
1109 argv--;
1110 argc++;
1111 break;
1112 }
1113 if (*arg == '-')
1114 usage(builtin_grep_usage);
1115
1116 /* First unrecognized non-option token */
1117 if (!opt.pattern_list) {
1118 add_pattern(&opt, arg, "command line", 0,
1119 GREP_PATTERN);
1120 break;
1121 }
1122 else {
1123 /* We are looking at the first path or rev;
1124 * it is found at argv[1] after leaving the
1125 * loop.
1126 */
1127 argc++; argv--;
1128 break;
1129 }
1130 }
1131
1132 if (!opt.pattern_list)
1133 die("no pattern given.");
1134 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
1135 die("cannot mix --fixed-strings and regexp");
1136 if (!opt.fixed)
1137 compile_patterns(&opt);
1138
1139 /* Check revs and then paths */
1140 for (i = 1; i < argc; i++) {
1141 const char *arg = argv[i];
1142 unsigned char sha1[20];
1143 /* Is it a rev? */
1144 if (!get_sha1(arg, sha1)) {
1145 struct object *object = parse_object(sha1);
1146 if (!object)
1147 die("bad object %s", arg);
1148 add_object_array(object, arg, &list);
1149 continue;
1150 }
1151 if (!strcmp(arg, "--")) {
1152 i++;
1153 seen_dashdash = 1;
1154 }
1155 break;
1156 }
1157
1158 /* The rest are paths */
1159 if (!seen_dashdash) {
1160 int j;
1161 for (j = i; j < argc; j++)
1162 verify_filename(prefix, argv[j]);
1163 }
1164
1165 if (i < argc)
1166 paths = get_pathspec(prefix, argv + i);
1167 else if (prefix) {
1168 paths = xcalloc(2, sizeof(const char *));
1169 paths[0] = prefix;
1170 paths[1] = NULL;
1171 }
1172
1173 if (!list.nr)
1174 return !grep_cache(&opt, paths, cached);
1175
1176 if (cached)
1177 die("both --cached and trees are given.");
1178
1179 for (i = 0; i < list.nr; i++) {
1180 struct object *real_obj;
1181 real_obj = deref_tag(list.objects[i].item, NULL, 0);
1182 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
1183 hit = 1;
1184 }
1185 return !hit;
1186 }