grep: add pmatch and eflags arguments to match_one_pattern()
[git/git.git] / builtin-grep.c
CommitLineData
5010cb5f
JH
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"
1362671f 11#include "tree-walk.h"
5010cb5f 12#include "builtin.h"
83b5d2f5 13#include "grep.h"
5010cb5f 14
5f7c643a
JK
15#ifndef NO_EXTERNAL_GREP
16#ifdef __unix__
17#define NO_EXTERNAL_GREP 0
18#else
19#define NO_EXTERNAL_GREP 1
20#endif
21#endif
22
e70b9a8b
NTND
23static int builtin_grep;
24
e0eb889f
JH
25/*
26 * git grep pathspecs are somewhat different from diff-tree pathspecs;
27 * pathname wildcards are allowed.
28 */
1362671f 29static int pathspec_matches(const char **paths, const char *name)
5010cb5f 30{
e0eb889f 31 int namelen, i;
1362671f 32 if (!paths || !*paths)
5010cb5f
JH
33 return 1;
34 namelen = strlen(name);
1362671f
JH
35 for (i = 0; paths[i]; i++) {
36 const char *match = paths[i];
37 int matchlen = strlen(match);
1e3d90e0 38 const char *cp, *meta;
e0eb889f 39
bb9e15a8
UKK
40 if (!matchlen ||
41 ((matchlen <= namelen) &&
42 !strncmp(name, match, matchlen) &&
43 (match[matchlen-1] == '/' ||
44 name[matchlen] == '\0' || name[matchlen] == '/')))
e0eb889f
JH
45 return 1;
46 if (!fnmatch(match, name, 0))
47 return 1;
48 if (name[namelen-1] != '/')
5010cb5f 49 continue;
e0eb889f 50
1e3d90e0 51 /* We are being asked if the directory ("name") is worth
e0eb889f
JH
52 * descending into.
53 *
54 * Find the longest leading directory name that does
55 * not have metacharacter in the pathspec; the name
56 * we are looking at must overlap with that directory.
5010cb5f 57 */
1e3d90e0 58 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
e0eb889f 59 char ch = *cp;
1e3d90e0
JH
60 if (ch == '*' || ch == '[' || ch == '?') {
61 meta = cp;
5010cb5f 62 break;
1e3d90e0 63 }
e0eb889f 64 }
1e3d90e0
JH
65 if (!meta)
66 meta = cp; /* fully literal */
67
68 if (namelen <= meta - match) {
e0eb889f
JH
69 /* Looking at "Documentation/" and
70 * the pattern says "Documentation/howto/", or
1e3d90e0
JH
71 * "Documentation/diff*.txt". The name we
72 * have should match prefix.
e0eb889f
JH
73 */
74 if (!memcmp(match, name, namelen))
75 return 1;
1e3d90e0 76 continue;
e0eb889f 77 }
1e3d90e0
JH
78
79 if (meta - match < namelen) {
e0eb889f 80 /* Looking at "Documentation/howto/" and
1e3d90e0
JH
81 * the pattern says "Documentation/h*";
82 * match up to "Do.../h"; this avoids descending
83 * into "Documentation/technical/".
e0eb889f 84 */
1e3d90e0 85 if (!memcmp(match, name, meta - match))
e0eb889f 86 return 1;
1e3d90e0 87 continue;
e0eb889f 88 }
5010cb5f
JH
89 }
90 return 0;
91}
92
0d042fec 93static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
5010cb5f
JH
94{
95 unsigned long size;
96 char *data;
21666f1a 97 enum object_type type;
0d042fec 98 char *to_free = NULL;
5010cb5f 99 int hit;
0d042fec 100
21666f1a 101 data = read_sha1_file(sha1, &type, &size);
5010cb5f
JH
102 if (!data) {
103 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
104 return 0;
105 }
0d042fec
JH
106 if (opt->relative && opt->prefix_length) {
107 static char name_buf[PATH_MAX];
108 char *cp;
109 int name_len = strlen(name) - opt->prefix_length + 1;
110
111 if (!tree_name_len)
112 name += opt->prefix_length;
113 else {
114 if (ARRAY_SIZE(name_buf) <= name_len)
115 cp = to_free = xmalloc(name_len);
116 else
117 cp = name_buf;
118 memcpy(cp, name, tree_name_len);
119 strcpy(cp + tree_name_len,
120 name + tree_name_len + opt->prefix_length);
121 name = cp;
122 }
123 }
5010cb5f
JH
124 hit = grep_buffer(opt, name, data, size);
125 free(data);
0d042fec 126 free(to_free);
5010cb5f
JH
127 return hit;
128}
129
130static int grep_file(struct grep_opt *opt, const char *filename)
131{
132 struct stat st;
133 int i;
134 char *data;
dc49cd76
SP
135 size_t sz;
136
5010cb5f
JH
137 if (lstat(filename, &st) < 0) {
138 err_ret:
139 if (errno != ENOENT)
140 error("'%s': %s", filename, strerror(errno));
141 return 0;
142 }
143 if (!st.st_size)
144 return 0; /* empty file -- no grep hit */
145 if (!S_ISREG(st.st_mode))
146 return 0;
dc49cd76 147 sz = xsize_t(st.st_size);
5010cb5f
JH
148 i = open(filename, O_RDONLY);
149 if (i < 0)
150 goto err_ret;
dc49cd76
SP
151 data = xmalloc(sz + 1);
152 if (st.st_size != read_in_full(i, data, sz)) {
5010cb5f
JH
153 error("'%s': short read %s", filename, strerror(errno));
154 close(i);
155 free(data);
156 return 0;
157 }
158 close(i);
0d042fec
JH
159 if (opt->relative && opt->prefix_length)
160 filename += opt->prefix_length;
dc49cd76 161 i = grep_buffer(opt, filename, data, sz);
5010cb5f
JH
162 free(data);
163 return i;
164}
165
5f7c643a 166#if !NO_EXTERNAL_GREP
1e2398d7
LT
167static int exec_grep(int argc, const char **argv)
168{
169 pid_t pid;
170 int status;
171
172 argv[argc] = NULL;
173 pid = fork();
174 if (pid < 0)
175 return pid;
176 if (!pid) {
177 execvp("grep", (char **) argv);
178 exit(255);
179 }
180 while (waitpid(pid, &status, 0) < 0) {
181 if (errno == EINTR)
182 continue;
183 return -1;
184 }
185 if (WIFEXITED(status)) {
186 if (!WEXITSTATUS(status))
187 return 1;
188 return 0;
189 }
190 return -1;
191}
192
193#define MAXARGS 1000
ffa0a7ab
JH
194#define ARGBUF 4096
195#define push_arg(a) do { \
196 if (nr < MAXARGS) argv[nr++] = (a); \
197 else die("maximum number of args exceeded"); \
198 } while (0)
1e2398d7 199
d99ebf08
JH
200/*
201 * If you send a singleton filename to grep, it does not give
202 * the name of the file. GNU grep has "-H" but we would want
203 * that behaviour in a portable way.
204 *
205 * So we keep two pathnames in argv buffer unsent to grep in
206 * the main loop if we need to do more than one grep.
207 */
208static int flush_grep(struct grep_opt *opt,
209 int argc, int arg0, const char **argv, int *kept)
210{
211 int status;
212 int count = argc - arg0;
213 const char *kept_0 = NULL;
214
215 if (count <= 2) {
216 /*
217 * Because we keep at least 2 paths in the call from
218 * the main loop (i.e. kept != NULL), and MAXARGS is
219 * far greater than 2, this usually is a call to
220 * conclude the grep. However, the user could attempt
221 * to overflow the argv buffer by giving too many
222 * options to leave very small number of real
223 * arguments even for the call in the main loop.
224 */
225 if (kept)
226 die("insanely many options to grep");
227
228 /*
229 * If we have two or more paths, we do not have to do
230 * anything special, but we need to push /dev/null to
231 * get "-H" behaviour of GNU grep portably but when we
232 * are not doing "-l" nor "-L" nor "-c".
233 */
234 if (count == 1 &&
235 !opt->name_only &&
236 !opt->unmatch_name_only &&
237 !opt->count) {
238 argv[argc++] = "/dev/null";
239 argv[argc] = NULL;
240 }
241 }
242
243 else if (kept) {
244 /*
245 * Called because we found many paths and haven't finished
246 * iterating over the cache yet. We keep two paths
247 * for the concluding call. argv[argc-2] and argv[argc-1]
248 * has the last two paths, so save the first one away,
249 * replace it with NULL while sending the list to grep,
250 * and recover them after we are done.
251 */
252 *kept = 2;
253 kept_0 = argv[argc-2];
254 argv[argc-2] = NULL;
255 argc -= 2;
256 }
257
258 status = exec_grep(argc, argv);
259
260 if (kept_0) {
261 /*
262 * Then recover them. Now the last arg is beyond the
263 * terminating NULL which is at argc, and the second
264 * from the last is what we saved away in kept_0
265 */
266 argv[arg0++] = kept_0;
267 argv[arg0] = argv[argc+1];
268 }
269 return status;
270}
271
1e2398d7
LT
272static int external_grep(struct grep_opt *opt, const char **paths, int cached)
273{
fcfe34b5 274 int i, nr, argc, hit, len, status;
1e2398d7 275 const char *argv[MAXARGS+1];
ffa0a7ab
JH
276 char randarg[ARGBUF];
277 char *argptr = randarg;
1e2398d7
LT
278 struct grep_pat *p;
279
0d042fec 280 if (opt->extended || (opt->relative && opt->prefix_length))
79d3696c 281 return -1;
ffa0a7ab
JH
282 len = nr = 0;
283 push_arg("grep");
ffa0a7ab 284 if (opt->fixed)
f6647519 285 push_arg("-F");
ffa0a7ab
JH
286 if (opt->linenum)
287 push_arg("-n");
7977f0ea
LT
288 if (!opt->pathname)
289 push_arg("-h");
ffa0a7ab
JH
290 if (opt->regflags & REG_EXTENDED)
291 push_arg("-E");
3026402c
RF
292 if (opt->regflags & REG_ICASE)
293 push_arg("-i");
bc395643
JH
294 if (opt->binary == GREP_BINARY_NOMATCH)
295 push_arg("-I");
1e2398d7 296 if (opt->word_regexp)
ffa0a7ab 297 push_arg("-w");
1e2398d7 298 if (opt->name_only)
ffa0a7ab
JH
299 push_arg("-l");
300 if (opt->unmatch_name_only)
301 push_arg("-L");
83caecca
RZ
302 if (opt->null_following_name)
303 /* in GNU grep git's "-z" translates to "-Z" */
304 push_arg("-Z");
ffa0a7ab
JH
305 if (opt->count)
306 push_arg("-c");
307 if (opt->post_context || opt->pre_context) {
308 if (opt->post_context != opt->pre_context) {
309 if (opt->pre_context) {
310 push_arg("-B");
311 len += snprintf(argptr, sizeof(randarg)-len,
4b87474b 312 "%u", opt->pre_context) + 1;
ffa0a7ab
JH
313 if (sizeof(randarg) <= len)
314 die("maximum length of args exceeded");
315 push_arg(argptr);
316 argptr += len;
317 }
318 if (opt->post_context) {
319 push_arg("-A");
320 len += snprintf(argptr, sizeof(randarg)-len,
4b87474b 321 "%u", opt->post_context) + 1;
ffa0a7ab
JH
322 if (sizeof(randarg) <= len)
323 die("maximum length of args exceeded");
324 push_arg(argptr);
325 argptr += len;
326 }
327 }
328 else {
329 push_arg("-C");
330 len += snprintf(argptr, sizeof(randarg)-len,
4b87474b 331 "%u", opt->post_context) + 1;
ffa0a7ab
JH
332 if (sizeof(randarg) <= len)
333 die("maximum length of args exceeded");
334 push_arg(argptr);
335 argptr += len;
336 }
337 }
1e2398d7 338 for (p = opt->pattern_list; p; p = p->next) {
ffa0a7ab
JH
339 push_arg("-e");
340 push_arg(p->pattern);
1e2398d7 341 }
bbb66c60 342
1e2398d7
LT
343 hit = 0;
344 argc = nr;
345 for (i = 0; i < active_nr; i++) {
346 struct cache_entry *ce = active_cache[i];
fbd01abf 347 char *name;
d99ebf08 348 int kept;
7a51ed66 349 if (!S_ISREG(ce->ce_mode))
1e2398d7
LT
350 continue;
351 if (!pathspec_matches(paths, ce->name))
352 continue;
bbb66c60
LT
353 name = ce->name;
354 if (name[0] == '-') {
355 int len = ce_namelen(ce);
356 name = xmalloc(len + 3);
357 memcpy(name, "./", 2);
358 memcpy(name + 2, ce->name, len + 1);
359 }
360 argv[argc++] = name;
6326cee5
JH
361 if (MAXARGS <= argc) {
362 status = flush_grep(opt, argc, nr, argv, &kept);
363 if (0 < status)
364 hit = 1;
365 argc = nr + kept;
366 }
36f2587f
JH
367 if (ce_stage(ce)) {
368 do {
369 i++;
370 } while (i < active_nr &&
371 !strcmp(ce->name, active_cache[i]->name));
372 i--; /* compensate for loop control */
373 }
1e2398d7 374 }
fcfe34b5 375 if (argc > nr) {
d99ebf08 376 status = flush_grep(opt, argc, nr, argv, NULL);
fcfe34b5
JH
377 if (0 < status)
378 hit = 1;
379 }
380 return hit;
1e2398d7 381}
ff1f9945 382#endif
1e2398d7 383
1362671f 384static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
5010cb5f
JH
385{
386 int hit = 0;
387 int nr;
388 read_cache();
389
5f7c643a 390#if !NO_EXTERNAL_GREP
1e2398d7
LT
391 /*
392 * Use the external "grep" command for the case where
393 * we grep through the checked-out files. It tends to
394 * be a lot more optimized
395 */
e70b9a8b 396 if (!cached && !builtin_grep) {
1e2398d7
LT
397 hit = external_grep(opt, paths, cached);
398 if (hit >= 0)
399 return hit;
400 }
401#endif
402
5010cb5f
JH
403 for (nr = 0; nr < active_nr; nr++) {
404 struct cache_entry *ce = active_cache[nr];
7a51ed66 405 if (!S_ISREG(ce->ce_mode))
5010cb5f 406 continue;
1362671f 407 if (!pathspec_matches(paths, ce->name))
5010cb5f 408 continue;
57d43466
NTND
409 /*
410 * If CE_VALID is on, we assume worktree file and its cache entry
411 * are identical, even if worktree file has been modified, so use
412 * cache version instead
413 */
414 if (cached || (ce->ce_flags & CE_VALID)) {
36f2587f
JH
415 if (ce_stage(ce))
416 continue;
0d042fec 417 hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
36f2587f 418 }
5010cb5f
JH
419 else
420 hit |= grep_file(opt, ce->name);
36f2587f
JH
421 if (ce_stage(ce)) {
422 do {
423 nr++;
424 } while (nr < active_nr &&
425 !strcmp(ce->name, active_cache[nr]->name));
426 nr--; /* compensate for loop control */
427 }
5010cb5f 428 }
b48fb5b6 429 free_grep_patterns(opt);
5010cb5f
JH
430 return hit;
431}
432
1362671f 433static int grep_tree(struct grep_opt *opt, const char **paths,
5010cb5f
JH
434 struct tree_desc *tree,
435 const char *tree_name, const char *base)
436{
5010cb5f
JH
437 int len;
438 int hit = 0;
4c068a98 439 struct name_entry entry;
e0eb889f 440 char *down;
0d042fec 441 int tn_len = strlen(tree_name);
620e2bb9
DP
442 struct strbuf pathbuf;
443
444 strbuf_init(&pathbuf, PATH_MAX + tn_len);
5010cb5f 445
0d042fec 446 if (tn_len) {
620e2bb9
DP
447 strbuf_add(&pathbuf, tree_name, tn_len);
448 strbuf_addch(&pathbuf, ':');
449 tn_len = pathbuf.len;
5010cb5f 450 }
620e2bb9
DP
451 strbuf_addstr(&pathbuf, base);
452 len = pathbuf.len;
5010cb5f 453
4c068a98 454 while (tree_entry(tree, &entry)) {
620e2bb9
DP
455 int te_len = tree_entry_len(entry.path, entry.sha1);
456 pathbuf.len = len;
457 strbuf_add(&pathbuf, entry.path, te_len);
5010cb5f 458
4c068a98 459 if (S_ISDIR(entry.mode))
e0eb889f
JH
460 /* Match "abc/" against pathspec to
461 * decide if we want to descend into "abc"
462 * directory.
463 */
620e2bb9 464 strbuf_addch(&pathbuf, '/');
e0eb889f 465
620e2bb9 466 down = pathbuf.buf + tn_len;
1362671f 467 if (!pathspec_matches(paths, down))
5010cb5f 468 ;
4c068a98 469 else if (S_ISREG(entry.mode))
620e2bb9 470 hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
4c068a98 471 else if (S_ISDIR(entry.mode)) {
21666f1a 472 enum object_type type;
5010cb5f
JH
473 struct tree_desc sub;
474 void *data;
6fda5e51
LT
475 unsigned long size;
476
477 data = read_sha1_file(entry.sha1, &type, &size);
5010cb5f
JH
478 if (!data)
479 die("unable to read tree (%s)",
4c068a98 480 sha1_to_hex(entry.sha1));
6fda5e51 481 init_tree_desc(&sub, data, size);
1362671f 482 hit |= grep_tree(opt, paths, &sub, tree_name, down);
5010cb5f
JH
483 free(data);
484 }
5010cb5f 485 }
620e2bb9 486 strbuf_release(&pathbuf);
5010cb5f
JH
487 return hit;
488}
489
1362671f 490static int grep_object(struct grep_opt *opt, const char **paths,
5010cb5f
JH
491 struct object *obj, const char *name)
492{
1974632c 493 if (obj->type == OBJ_BLOB)
0d042fec 494 return grep_sha1(opt, obj->sha1, name, 0);
1974632c 495 if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
5010cb5f
JH
496 struct tree_desc tree;
497 void *data;
6fda5e51 498 unsigned long size;
5010cb5f
JH
499 int hit;
500 data = read_object_with_reference(obj->sha1, tree_type,
6fda5e51 501 &size, NULL);
5010cb5f
JH
502 if (!data)
503 die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
6fda5e51 504 init_tree_desc(&tree, data, size);
1362671f 505 hit = grep_tree(opt, paths, &tree, name, "");
5010cb5f
JH
506 free(data);
507 return hit;
508 }
885a86ab 509 die("unable to grep from object of type %s", typename(obj->type));
5010cb5f
JH
510}
511
512static const char builtin_grep_usage[] =
fa4946b5 513"git grep <option>* [-e] <pattern> <rev>* [[--] <path>...]";
5010cb5f 514
088b084b
JH
515static const char emsg_invalid_context_len[] =
516"%s: invalid context length argument";
517static const char emsg_missing_context_len[] =
518"missing context length argument";
519static const char emsg_missing_argument[] =
520"option requires an argument -%s";
521
a633fca0 522int cmd_grep(int argc, const char **argv, const char *prefix)
5010cb5f 523{
5010cb5f 524 int hit = 0;
5010cb5f 525 int cached = 0;
5acd64ed 526 int seen_dashdash = 0;
5010cb5f 527 struct grep_opt opt;
1f1e895f 528 struct object_array list = { 0, 0, NULL };
1362671f 529 const char **paths = NULL;
5acd64ed 530 int i;
5010cb5f
JH
531
532 memset(&opt, 0, sizeof(opt));
0d042fec
JH
533 opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
534 opt.relative = 1;
7977f0ea 535 opt.pathname = 1;
f9b9faf6 536 opt.pattern_tail = &opt.pattern_list;
5010cb5f
JH
537 opt.regflags = REG_NEWLINE;
538
539 /*
5acd64ed
JH
540 * If there is no -- then the paths must exist in the working
541 * tree. If there is no explicit pattern specified with -e or
542 * -f, we take the first unrecognized non option to be the
543 * pattern, but then what follows it must be zero or more
544 * valid refs up to the -- (if exists), and then existing
545 * paths. If there is an explicit pattern, then the first
82e5a82f 546 * unrecognized non option is the beginning of the refs list
5acd64ed 547 * that continues up to the -- (if exists), and then paths.
5010cb5f 548 */
5acd64ed 549
1362671f
JH
550 while (1 < argc) {
551 const char *arg = argv[1];
552 argc--; argv++;
553 if (!strcmp("--cached", arg)) {
554 cached = 1;
555 continue;
556 }
e70b9a8b
NTND
557 if (!strcmp("--no-ext-grep", arg)) {
558 builtin_grep = 1;
559 continue;
560 }
b8d0f5a0
JH
561 if (!strcmp("-a", arg) ||
562 !strcmp("--text", arg)) {
563 opt.binary = GREP_BINARY_TEXT;
564 continue;
565 }
1362671f
JH
566 if (!strcmp("-i", arg) ||
567 !strcmp("--ignore-case", arg)) {
568 opt.regflags |= REG_ICASE;
569 continue;
570 }
b8d0f5a0
JH
571 if (!strcmp("-I", arg)) {
572 opt.binary = GREP_BINARY_NOMATCH;
573 continue;
574 }
1362671f
JH
575 if (!strcmp("-v", arg) ||
576 !strcmp("--invert-match", arg)) {
577 opt.invert = 1;
578 continue;
579 }
580 if (!strcmp("-E", arg) ||
581 !strcmp("--extended-regexp", arg)) {
582 opt.regflags |= REG_EXTENDED;
583 continue;
584 }
07ea91d8
JH
585 if (!strcmp("-F", arg) ||
586 !strcmp("--fixed-strings", arg)) {
587 opt.fixed = 1;
588 continue;
589 }
1362671f
JH
590 if (!strcmp("-G", arg) ||
591 !strcmp("--basic-regexp", arg)) {
592 opt.regflags &= ~REG_EXTENDED;
593 continue;
594 }
595 if (!strcmp("-n", arg)) {
596 opt.linenum = 1;
597 continue;
598 }
7977f0ea
LT
599 if (!strcmp("-h", arg)) {
600 opt.pathname = 0;
601 continue;
602 }
1362671f 603 if (!strcmp("-H", arg)) {
7977f0ea 604 opt.pathname = 1;
1362671f
JH
605 continue;
606 }
607 if (!strcmp("-l", arg) ||
2cd5dfd2 608 !strcmp("--name-only", arg) ||
1362671f
JH
609 !strcmp("--files-with-matches", arg)) {
610 opt.name_only = 1;
611 continue;
612 }
e23d2d6b
JH
613 if (!strcmp("-L", arg) ||
614 !strcmp("--files-without-match", arg)) {
615 opt.unmatch_name_only = 1;
616 continue;
617 }
83caecca
RZ
618 if (!strcmp("-z", arg) ||
619 !strcmp("--null", arg)) {
620 opt.null_following_name = 1;
621 continue;
622 }
2c866cf1
JH
623 if (!strcmp("-c", arg) ||
624 !strcmp("--count", arg)) {
625 opt.count = 1;
626 continue;
627 }
7839a25e
JH
628 if (!strcmp("-w", arg) ||
629 !strcmp("--word-regexp", arg)) {
630 opt.word_regexp = 1;
631 continue;
632 }
599065a3
JH
633 if (!prefixcmp(arg, "-A") ||
634 !prefixcmp(arg, "-B") ||
635 !prefixcmp(arg, "-C") ||
f462ebb4 636 (arg[0] == '-' && '1' <= arg[1] && arg[1] <= '9')) {
1362671f 637 unsigned num;
f462ebb4
JH
638 const char *scan;
639 switch (arg[1]) {
640 case 'A': case 'B': case 'C':
641 if (!arg[2]) {
642 if (argc <= 1)
088b084b 643 die(emsg_missing_context_len);
f462ebb4
JH
644 scan = *++argv;
645 argc--;
646 }
647 else
648 scan = arg + 2;
649 break;
650 default:
651 scan = arg + 1;
652 break;
653 }
6aead43d 654 if (strtoul_ui(scan, 10, &num))
088b084b 655 die(emsg_invalid_context_len, scan);
1362671f
JH
656 switch (arg[1]) {
657 case 'A':
658 opt.post_context = num;
659 break;
f462ebb4 660 default:
1362671f
JH
661 case 'C':
662 opt.post_context = num;
663 case 'B':
664 opt.pre_context = num;
665 break;
5010cb5f 666 }
1362671f
JH
667 continue;
668 }
aa8c79ad
JH
669 if (!strcmp("-f", arg)) {
670 FILE *patterns;
671 int lno = 0;
672 char buf[1024];
673 if (argc <= 1)
088b084b 674 die(emsg_missing_argument, arg);
aa8c79ad
JH
675 patterns = fopen(argv[1], "r");
676 if (!patterns)
5acd64ed 677 die("'%s': %s", argv[1], strerror(errno));
aa8c79ad
JH
678 while (fgets(buf, sizeof(buf), patterns)) {
679 int len = strlen(buf);
872c930d 680 if (len && buf[len-1] == '\n')
aa8c79ad
JH
681 buf[len-1] = 0;
682 /* ignore empty line like grep does */
683 if (!buf[0])
684 continue;
83b5d2f5
JH
685 append_grep_pattern(&opt, xstrdup(buf),
686 argv[1], ++lno,
687 GREP_PATTERN);
aa8c79ad
JH
688 }
689 fclose(patterns);
690 argv++;
691 argc--;
692 continue;
693 }
79d3696c 694 if (!strcmp("--not", arg)) {
83b5d2f5
JH
695 append_grep_pattern(&opt, arg, "command line", 0,
696 GREP_NOT);
79d3696c
JH
697 continue;
698 }
699 if (!strcmp("--and", arg)) {
83b5d2f5
JH
700 append_grep_pattern(&opt, arg, "command line", 0,
701 GREP_AND);
79d3696c
JH
702 continue;
703 }
704 if (!strcmp("--or", arg))
705 continue; /* no-op */
706 if (!strcmp("(", arg)) {
83b5d2f5
JH
707 append_grep_pattern(&opt, arg, "command line", 0,
708 GREP_OPEN_PAREN);
79d3696c
JH
709 continue;
710 }
711 if (!strcmp(")", arg)) {
83b5d2f5
JH
712 append_grep_pattern(&opt, arg, "command line", 0,
713 GREP_CLOSE_PAREN);
79d3696c
JH
714 continue;
715 }
0ab7befa
JH
716 if (!strcmp("--all-match", arg)) {
717 opt.all_match = 1;
718 continue;
719 }
1362671f
JH
720 if (!strcmp("-e", arg)) {
721 if (1 < argc) {
83b5d2f5
JH
722 append_grep_pattern(&opt, argv[1],
723 "-e option", 0,
724 GREP_PATTERN);
f9b9faf6 725 argv++;
1362671f 726 argc--;
5010cb5f
JH
727 continue;
728 }
088b084b 729 die(emsg_missing_argument, arg);
1362671f 730 }
0d042fec
JH
731 if (!strcmp("--full-name", arg)) {
732 opt.relative = 0;
733 continue;
734 }
5390590f
JH
735 if (!strcmp("--", arg)) {
736 /* later processing wants to have this at argv[1] */
737 argv--;
738 argc++;
5acd64ed 739 break;
5390590f 740 }
5acd64ed 741 if (*arg == '-')
1362671f 742 usage(builtin_grep_usage);
5acd64ed
JH
743
744 /* First unrecognized non-option token */
f9b9faf6 745 if (!opt.pattern_list) {
83b5d2f5
JH
746 append_grep_pattern(&opt, arg, "command line", 0,
747 GREP_PATTERN);
1362671f
JH
748 break;
749 }
750 else {
751 /* We are looking at the first path or rev;
5acd64ed 752 * it is found at argv[1] after leaving the
1362671f
JH
753 * loop.
754 */
755 argc++; argv--;
756 break;
5010cb5f 757 }
5010cb5f 758 }
5acd64ed 759
f9b9faf6 760 if (!opt.pattern_list)
5010cb5f 761 die("no pattern given.");
07ea91d8
JH
762 if ((opt.regflags != REG_NEWLINE) && opt.fixed)
763 die("cannot mix --fixed-strings and regexp");
83b5d2f5 764 compile_grep_patterns(&opt);
5acd64ed
JH
765
766 /* Check revs and then paths */
767 for (i = 1; i < argc; i++) {
768 const char *arg = argv[i];
1362671f 769 unsigned char sha1[20];
5acd64ed
JH
770 /* Is it a rev? */
771 if (!get_sha1(arg, sha1)) {
772 struct object *object = parse_object(sha1);
5acd64ed
JH
773 if (!object)
774 die("bad object %s", arg);
1f1e895f 775 add_object_array(object, arg, &list);
5acd64ed
JH
776 continue;
777 }
778 if (!strcmp(arg, "--")) {
779 i++;
780 seen_dashdash = 1;
781 }
782 break;
1362671f 783 }
5acd64ed
JH
784
785 /* The rest are paths */
786 if (!seen_dashdash) {
787 int j;
c39c4f47 788 for (j = i; j < argc; j++)
5acd64ed
JH
789 verify_filename(prefix, argv[j]);
790 }
791
0d042fec 792 if (i < argc) {
5acd64ed 793 paths = get_pathspec(prefix, argv + i);
0d042fec
JH
794 if (opt.prefix_length && opt.relative) {
795 /* Make sure we do not get outside of paths */
796 for (i = 0; paths[i]; i++)
797 if (strncmp(prefix, paths[i], opt.prefix_length))
7e44c935 798 die("git grep: cannot generate relative filenames containing '..'");
0d042fec
JH
799 }
800 }
1362671f
JH
801 else if (prefix) {
802 paths = xcalloc(2, sizeof(const char *));
803 paths[0] = prefix;
804 paths[1] = NULL;
805 }
5010cb5f 806
6577f542
NTND
807 if (!list.nr) {
808 if (!cached)
809 setup_work_tree();
1362671f 810 return !grep_cache(&opt, paths, cached);
6577f542 811 }
aa8c79ad 812
5010cb5f 813 if (cached)
aa8c79ad 814 die("both --cached and trees are given.");
5010cb5f 815
1f1e895f 816 for (i = 0; i < list.nr; i++) {
5010cb5f 817 struct object *real_obj;
1f1e895f
LT
818 real_obj = deref_tag(list.objects[i].item, NULL, 0);
819 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
5010cb5f
JH
820 hit = 1;
821 }
b48fb5b6 822 free_grep_patterns(&opt);
5010cb5f
JH
823 return !hit;
824}