Code

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