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 "parse-options.h"
  14 #include "userdiff.h"
  15 #include "grep.h"
  16 #include "quote.h"
  17
  18 #ifndef NO_EXTERNAL_GREP
  19 #ifdef __unix__
  20 #define NO_EXTERNAL_GREP 0
  21 #else
  22 #define NO_EXTERNAL_GREP 1
  23 #endif
  24 #endif
  25
  26 static char const * const grep_usage[] = {
  27         "git grep [options] [-e] <pattern> [<rev>...] [[--] path...]",
  28         NULL
  29 };
  30
  31 static int grep_config(const char *var, const char *value, void *cb)
  32 {
  33         struct grep_opt *opt = cb;
  34
  35         switch (userdiff_config(var, value)) {
  36         case 0: break;
  37         case -1: return -1;
  38         default: return 0;
  39         }
  40
  41         if (!strcmp(var, "color.grep")) {
  42                 opt->color = git_config_colorbool(var, value, -1);
  43                 return 0;
  44         }
  45         if (!strcmp(var, "color.grep.external"))
  46                 return git_config_string(&(opt->color_external), var, value);
  47         if (!strcmp(var, "color.grep.match")) {
  48                 if (!value)
  49                         return config_error_nonbool(var);
  50                 color_parse(value, var, opt->color_match);
  51                 return 0;
  52         }
  53         return git_color_default_config(var, value, cb);
  54 }
  55
  56 /*
  57  * Return non-zero if max_depth is negative or path has no more then max_depth
  58  * slashes.
  59  */
  60 static int accept_subdir(const char *path, int max_depth)
  61 {
  62         if (max_depth < 0)
  63                 return 1;
  64
  65         while ((path = strchr(path, '/')) != NULL) {
  66                 max_depth--;
  67                 if (max_depth < 0)
  68                         return 0;
  69                 path++;
  70         }
  71         return 1;
  72 }
  73
  74 /*
  75  * Return non-zero if name is a subdirectory of match and is not too deep.
  76  */
  77 static int is_subdir(const char *name, int namelen,
  78                 const char *match, int matchlen, int max_depth)
  79 {
  80         if (matchlen > namelen || strncmp(name, match, matchlen))
  81                 return 0;
  82
  83         if (name[matchlen] == '\0') /* exact match */
  84                 return 1;
  85
  86         if (!matchlen || match[matchlen-1] == '/' || name[matchlen] == '/')
  87                 return accept_subdir(name + matchlen + 1, max_depth);
  88
  89         return 0;
  90 }
  91
  92 /*
  93  * git grep pathspecs are somewhat different from diff-tree pathspecs;
  94  * pathname wildcards are allowed.
  95  */
  96 static int pathspec_matches(const char **paths, const char *name, int max_depth)
  97 {
  98         int namelen, i;
  99         if (!paths || !*paths)
 100                 return accept_subdir(name, max_depth);
 101         namelen = strlen(name);
 102         for (i = 0; paths[i]; i++) {
 103                 const char *match = paths[i];
 104                 int matchlen = strlen(match);
 105                 const char *cp, *meta;
 106
 107                 if (is_subdir(name, namelen, match, matchlen, max_depth))
 108                         return 1;
 109                 if (!fnmatch(match, name, 0))
 110                         return 1;
 111                 if (name[namelen-1] != '/')
 112                         continue;
 113
 114                 /* We are being asked if the directory ("name") is worth
 115                  * descending into.
 116                  *
 117                  * Find the longest leading directory name that does
 118                  * not have metacharacter in the pathspec; the name
 119                  * we are looking at must overlap with that directory.
 120                  */
 121                 for (cp = match, meta = NULL; cp - match < matchlen; cp++) {
 122                         char ch = *cp;
 123                         if (ch == '*' || ch == '[' || ch == '?') {
 124                                 meta = cp;
 125                                 break;
 126                         }
 127                 }
 128                 if (!meta)
 129                         meta = cp; /* fully literal */
 130
 131                 if (namelen <= meta - match) {
 132                         /* Looking at "Documentation/" and
 133                          * the pattern says "Documentation/howto/", or
 134                          * "Documentation/diff*.txt".  The name we
 135                          * have should match prefix.
 136                          */
 137                         if (!memcmp(match, name, namelen))
 138                                 return 1;
 139                         continue;
 140                 }
 141
 142                 if (meta - match < namelen) {
 143                         /* Looking at "Documentation/howto/" and
 144                          * the pattern says "Documentation/h*";
 145                          * match up to "Do.../h"; this avoids descending
 146                          * into "Documentation/technical/".
 147                          */
 148                         if (!memcmp(match, name, meta - match))
 149                                 return 1;
 150                         continue;
 151                 }
 152         }
 153         return 0;
 154 }
 155
 156 static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
 157 {
 158         unsigned long size;
 159         char *data;
 160         enum object_type type;
 161         int hit;
 162         struct strbuf pathbuf = STRBUF_INIT;
 163
 164         data = read_sha1_file(sha1, &type, &size);
 165         if (!data) {
 166                 error("'%s': unable to read %s", name, sha1_to_hex(sha1));
 167                 return 0;
 168         }
 169         if (opt->relative && opt->prefix_length) {
 170                 quote_path_relative(name + tree_name_len, -1, &pathbuf, opt->prefix);
 171                 strbuf_insert(&pathbuf, 0, name, tree_name_len);
 172                 name = pathbuf.buf;
 173         }
 174         hit = grep_buffer(opt, name, data, size);
 175         strbuf_release(&pathbuf);
 176         free(data);
 177         return hit;
 178 }
 179
 180 static int grep_file(struct grep_opt *opt, const char *filename)
 181 {
 182         struct stat st;
 183         int i;
 184         char *data;
 185         size_t sz;
 186         struct strbuf buf = STRBUF_INIT;
 187
 188         if (lstat(filename, &st) < 0) {
 189         err_ret:
 190                 if (errno != ENOENT)
 191                         error("'%s': %s", filename, strerror(errno));
 192                 return 0;
 193         }
 194         if (!st.st_size)
 195                 return 0; /* empty file -- no grep hit */
 196         if (!S_ISREG(st.st_mode))
 197                 return 0;
 198         sz = xsize_t(st.st_size);
 199         i = open(filename, O_RDONLY);
 200         if (i < 0)
 201                 goto err_ret;
 202         data = xmalloc(sz + 1);
 203         if (st.st_size != read_in_full(i, data, sz)) {
 204                 error("'%s': short read %s", filename, strerror(errno));
 205                 close(i);
 206                 free(data);
 207                 return 0;
 208         }
 209         close(i);
 210         data[sz] = 0;
 211         if (opt->relative && opt->prefix_length)
 212                 filename = quote_path_relative(filename, -1, &buf, opt->prefix);
 213         i = grep_buffer(opt, filename, data, sz);
 214         strbuf_release(&buf);
 215         free(data);
 216         return i;
 217 }
 218
 219 #if !NO_EXTERNAL_GREP
 220 static int exec_grep(int argc, const char **argv)
 221 {
 222         pid_t pid;
 223         int status;
 224
 225         argv[argc] = NULL;
 226         pid = fork();
 227         if (pid < 0)
 228                 return pid;
 229         if (!pid) {
 230                 execvp("grep", (char **) argv);
 231                 exit(255);
 232         }
 233         while (waitpid(pid, &status, 0) < 0) {
 234                 if (errno == EINTR)
 235                         continue;
 236                 return -1;
 237         }
 238         if (WIFEXITED(status)) {
 239                 if (!WEXITSTATUS(status))
 240                         return 1;
 241                 return 0;
 242         }
 243         return -1;
 244 }
 245
 246 #define MAXARGS 1000
 247 #define ARGBUF 4096
 248 #define push_arg(a) do { \
 249         if (nr < MAXARGS) argv[nr++] = (a); \
 250         else die("maximum number of args exceeded"); \
 251         } while (0)
 252
 253 /*
 254  * If you send a singleton filename to grep, it does not give
 255  * the name of the file.  GNU grep has "-H" but we would want
 256  * that behaviour in a portable way.
 257  *
 258  * So we keep two pathnames in argv buffer unsent to grep in
 259  * the main loop if we need to do more than one grep.
 260  */
 261 static int flush_grep(struct grep_opt *opt,
 262                       int argc, int arg0, const char **argv, int *kept)
 263 {
 264         int status;
 265         int count = argc - arg0;
 266         const char *kept_0 = NULL;
 267
 268         if (count <= 2) {
 269                 /*
 270                  * Because we keep at least 2 paths in the call from
 271                  * the main loop (i.e. kept != NULL), and MAXARGS is
 272                  * far greater than 2, this usually is a call to
 273                  * conclude the grep.  However, the user could attempt
 274                  * to overflow the argv buffer by giving too many
 275                  * options to leave very small number of real
 276                  * arguments even for the call in the main loop.
 277                  */
 278                 if (kept)
 279                         die("insanely many options to grep");
 280
 281                 /*
 282                  * If we have two or more paths, we do not have to do
 283                  * anything special, but we need to push /dev/null to
 284                  * get "-H" behaviour of GNU grep portably but when we
 285                  * are not doing "-l" nor "-L" nor "-c".
 286                  */
 287                 if (count == 1 &&
 288                     !opt->name_only &&
 289                     !opt->unmatch_name_only &&
 290                     !opt->count) {
 291                         argv[argc++] = "/dev/null";
 292                         argv[argc] = NULL;
 293                 }
 294         }
 295
 296         else if (kept) {
 297                 /*
 298                  * Called because we found many paths and haven't finished
 299                  * iterating over the cache yet.  We keep two paths
 300                  * for the concluding call.  argv[argc-2] and argv[argc-1]
 301                  * has the last two paths, so save the first one away,
 302                  * replace it with NULL while sending the list to grep,
 303                  * and recover them after we are done.
 304                  */
 305                 *kept = 2;
 306                 kept_0 = argv[argc-2];
 307                 argv[argc-2] = NULL;
 308                 argc -= 2;
 309         }
 310
 311         if (opt->pre_context || opt->post_context) {
 312                 /*
 313                  * grep handles hunk marks between files, but we need to
 314                  * do that ourselves between multiple calls.
 315                  */
 316                 if (opt->show_hunk_mark)
 317                         write_or_die(1, "--\n", 3);
 318                 else
 319                         opt->show_hunk_mark = 1;
 320         }
 321
 322         status = exec_grep(argc, argv);
 323
 324         if (kept_0) {
 325                 /*
 326                  * Then recover them.  Now the last arg is beyond the
 327                  * terminating NULL which is at argc, and the second
 328                  * from the last is what we saved away in kept_0
 329                  */
 330                 argv[arg0++] = kept_0;
 331                 argv[arg0] = argv[argc+1];
 332         }
 333         return status;
 334 }
 335
 336 static void grep_add_color(struct strbuf *sb, const char *escape_seq)
 337 {
 338         size_t orig_len = sb->len;
 339
 340         while (*escape_seq) {
 341                 if (*escape_seq == 'm')
 342                         strbuf_addch(sb, ';');
 343                 else if (*escape_seq != '\033' && *escape_seq  != '[')
 344                         strbuf_addch(sb, *escape_seq);
 345                 escape_seq++;
 346         }
 347         if (sb->len > orig_len && sb->buf[sb->len - 1] == ';')
 348                 strbuf_setlen(sb, sb->len - 1);
 349 }
 350
 351 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 352 {
 353         int i, nr, argc, hit, len, status;
 354         const char *argv[MAXARGS+1];
 355         char randarg[ARGBUF];
 356         char *argptr = randarg;
 357         struct grep_pat *p;
 358
 359         if (opt->extended || (opt->relative && opt->prefix_length))
 360                 return -1;
 361         len = nr = 0;
 362         push_arg("grep");
 363         if (opt->fixed)
 364                 push_arg("-F");
 365         if (opt->linenum)
 366                 push_arg("-n");
 367         if (!opt->pathname)
 368                 push_arg("-h");
 369         if (opt->regflags & REG_EXTENDED)
 370                 push_arg("-E");
 371         if (opt->ignore_case)
 372                 push_arg("-i");
 373         if (opt->binary == GREP_BINARY_NOMATCH)
 374                 push_arg("-I");
 375         if (opt->word_regexp)
 376                 push_arg("-w");
 377         if (opt->name_only)
 378                 push_arg("-l");
 379         if (opt->unmatch_name_only)
 380                 push_arg("-L");
 381         if (opt->null_following_name)
 382                 /* in GNU grep git's "-z" translates to "-Z" */
 383                 push_arg("-Z");
 384         if (opt->count)
 385                 push_arg("-c");
 386         if (opt->post_context || opt->pre_context) {
 387                 if (opt->post_context != opt->pre_context) {
 388                         if (opt->pre_context) {
 389                                 push_arg("-B");
 390                                 len += snprintf(argptr, sizeof(randarg)-len,
 391                                                 "%u", opt->pre_context) + 1;
 392                                 if (sizeof(randarg) <= len)
 393                                         die("maximum length of args exceeded");
 394                                 push_arg(argptr);
 395                                 argptr += len;
 396                         }
 397                         if (opt->post_context) {
 398                                 push_arg("-A");
 399                                 len += snprintf(argptr, sizeof(randarg)-len,
 400                                                 "%u", opt->post_context) + 1;
 401                                 if (sizeof(randarg) <= len)
 402                                         die("maximum length of args exceeded");
 403                                 push_arg(argptr);
 404                                 argptr += len;
 405                         }
 406                 }
 407                 else {
 408                         push_arg("-C");
 409                         len += snprintf(argptr, sizeof(randarg)-len,
 410                                         "%u", opt->post_context) + 1;
 411                         if (sizeof(randarg) <= len)
 412                                 die("maximum length of args exceeded");
 413                         push_arg(argptr);
 414                         argptr += len;
 415                 }
 416         }
 417         for (p = opt->pattern_list; p; p = p->next) {
 418                 push_arg("-e");
 419                 push_arg(p->pattern);
 420         }
 421         if (opt->color) {
 422                 struct strbuf sb = STRBUF_INIT;
 423
 424                 grep_add_color(&sb, opt->color_match);
 425                 setenv("GREP_COLOR", sb.buf, 1);
 426
 427                 strbuf_reset(&sb);
 428                 strbuf_addstr(&sb, "mt=");
 429                 grep_add_color(&sb, opt->color_match);
 430                 strbuf_addstr(&sb, ":sl=:cx=:fn=:ln=:bn=:se=");
 431                 setenv("GREP_COLORS", sb.buf, 1);
 432
 433                 strbuf_release(&sb);
 434
 435                 if (opt->color_external && strlen(opt->color_external) > 0)
 436                         push_arg(opt->color_external);
 437         }
 438
 439         hit = 0;
 440         argc = nr;
 441         for (i = 0; i < active_nr; i++) {
 442                 struct cache_entry *ce = active_cache[i];
 443                 char *name;
 444                 int kept;
 445                 if (!S_ISREG(ce->ce_mode))
 446                         continue;
 447                 if (!pathspec_matches(paths, ce->name, opt->max_depth))
 448                         continue;
 449                 name = ce->name;
 450                 if (name[0] == '-') {
 451                         int len = ce_namelen(ce);
 452                         name = xmalloc(len + 3);
 453                         memcpy(name, "./", 2);
 454                         memcpy(name + 2, ce->name, len + 1);
 455                 }
 456                 argv[argc++] = name;
 457                 if (MAXARGS <= argc) {
 458                         status = flush_grep(opt, argc, nr, argv, &kept);
 459                         if (0 < status)
 460                                 hit = 1;
 461                         argc = nr + kept;
 462                 }
 463                 if (ce_stage(ce)) {
 464                         do {
 465                                 i++;
 466                         } while (i < active_nr &&
 467                                  !strcmp(ce->name, active_cache[i]->name));
 468                         i--; /* compensate for loop control */
 469                 }
 470         }
 471         if (argc > nr) {
 472                 status = flush_grep(opt, argc, nr, argv, NULL);
 473                 if (0 < status)
 474                         hit = 1;
 475         }
 476         return hit;
 477 }
 478 #endif
 479
 480 static int grep_cache(struct grep_opt *opt, const char **paths, int cached,
 481                       int external_grep_allowed)
 482 {
 483         int hit = 0;
 484         int nr;
 485         read_cache();
 486
 487 #if !NO_EXTERNAL_GREP
 488         /*
 489          * Use the external "grep" command for the case where
 490          * we grep through the checked-out files. It tends to
 491          * be a lot more optimized
 492          */
 493         if (!cached && external_grep_allowed) {
 494                 hit = external_grep(opt, paths, cached);
 495                 if (hit >= 0)
 496                         return hit;
 497                 hit = 0;
 498         }
 499 #endif
 500
 501         for (nr = 0; nr < active_nr; nr++) {
 502                 struct cache_entry *ce = active_cache[nr];
 503                 if (!S_ISREG(ce->ce_mode))
 504                         continue;
 505                 if (!pathspec_matches(paths, ce->name, opt->max_depth))
 506                         continue;
 507                 /*
 508                  * If CE_VALID is on, we assume worktree file and its cache entry
 509                  * are identical, even if worktree file has been modified, so use
 510                  * cache version instead
 511                  */
 512                 if (cached || (ce->ce_flags & CE_VALID)) {
 513                         if (ce_stage(ce))
 514                                 continue;
 515                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
 516                 }
 517                 else
 518                         hit |= grep_file(opt, ce->name);
 519                 if (ce_stage(ce)) {
 520                         do {
 521                                 nr++;
 522                         } while (nr < active_nr &&
 523                                  !strcmp(ce->name, active_cache[nr]->name));
 524                         nr--; /* compensate for loop control */
 525                 }
 526         }
 527         free_grep_patterns(opt);
 528         return hit;
 529 }
 530
 531 static int grep_tree(struct grep_opt *opt, const char **paths,
 532                      struct tree_desc *tree,
 533                      const char *tree_name, const char *base)
 534 {
 535         int len;
 536         int hit = 0;
 537         struct name_entry entry;
 538         char *down;
 539         int tn_len = strlen(tree_name);
 540         struct strbuf pathbuf;
 541
 542         strbuf_init(&pathbuf, PATH_MAX + tn_len);
 543
 544         if (tn_len) {
 545                 strbuf_add(&pathbuf, tree_name, tn_len);
 546                 strbuf_addch(&pathbuf, ':');
 547                 tn_len = pathbuf.len;
 548         }
 549         strbuf_addstr(&pathbuf, base);
 550         len = pathbuf.len;
 551
 552         while (tree_entry(tree, &entry)) {
 553                 int te_len = tree_entry_len(entry.path, entry.sha1);
 554                 pathbuf.len = len;
 555                 strbuf_add(&pathbuf, entry.path, te_len);
 556
 557                 if (S_ISDIR(entry.mode))
 558                         /* Match "abc/" against pathspec to
 559                          * decide if we want to descend into "abc"
 560                          * directory.
 561                          */
 562                         strbuf_addch(&pathbuf, '/');
 563
 564                 down = pathbuf.buf + tn_len;
 565                 if (!pathspec_matches(paths, down, opt->max_depth))
 566                         ;
 567                 else if (S_ISREG(entry.mode))
 568                         hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
 569                 else if (S_ISDIR(entry.mode)) {
 570                         enum object_type type;
 571                         struct tree_desc sub;
 572                         void *data;
 573                         unsigned long size;
 574
 575                         data = read_sha1_file(entry.sha1, &type, &size);
 576                         if (!data)
 577                                 die("unable to read tree (%s)",
 578                                     sha1_to_hex(entry.sha1));
 579                         init_tree_desc(&sub, data, size);
 580                         hit |= grep_tree(opt, paths, &sub, tree_name, down);
 581                         free(data);
 582                 }
 583         }
 584         strbuf_release(&pathbuf);
 585         return hit;
 586 }
 587
 588 static int grep_object(struct grep_opt *opt, const char **paths,
 589                        struct object *obj, const char *name)
 590 {
 591         if (obj->type == OBJ_BLOB)
 592                 return grep_sha1(opt, obj->sha1, name, 0);
 593         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 594                 struct tree_desc tree;
 595                 void *data;
 596                 unsigned long size;
 597                 int hit;
 598                 data = read_object_with_reference(obj->sha1, tree_type,
 599                                                   &size, NULL);
 600                 if (!data)
 601                         die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
 602                 init_tree_desc(&tree, data, size);
 603                 hit = grep_tree(opt, paths, &tree, name, "");
 604                 free(data);
 605                 return hit;
 606         }
 607         die("unable to grep from object of type %s", typename(obj->type));
 608 }
 609
 610 static int context_callback(const struct option *opt, const char *arg,
 611                             int unset)
 612 {
 613         struct grep_opt *grep_opt = opt->value;
 614         int value;
 615         const char *endp;
 616
 617         if (unset) {
 618                 grep_opt->pre_context = grep_opt->post_context = 0;
 619                 return 0;
 620         }
 621         value = strtol(arg, (char **)&endp, 10);
 622         if (*endp) {
 623                 return error("switch `%c' expects a numerical value",
 624                              opt->short_name);
 625         }
 626         grep_opt->pre_context = grep_opt->post_context = value;
 627         return 0;
 628 }
 629
 630 static int file_callback(const struct option *opt, const char *arg, int unset)
 631 {
 632         struct grep_opt *grep_opt = opt->value;
 633         FILE *patterns;
 634         int lno = 0;
 635         struct strbuf sb = STRBUF_INIT;
 636
 637         patterns = fopen(arg, "r");
 638         if (!patterns)
 639                 die_errno("cannot open '%s'", arg);
 640         while (strbuf_getline(&sb, patterns, '\n') == 0) {
 641                 /* ignore empty line like grep does */
 642                 if (sb.len == 0)
 643                         continue;
 644                 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
 645                                     ++lno, GREP_PATTERN);
 646         }
 647         fclose(patterns);
 648         strbuf_release(&sb);
 649         return 0;
 650 }
 651
 652 static int not_callback(const struct option *opt, const char *arg, int unset)
 653 {
 654         struct grep_opt *grep_opt = opt->value;
 655         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 656         return 0;
 657 }
 658
 659 static int and_callback(const struct option *opt, const char *arg, int unset)
 660 {
 661         struct grep_opt *grep_opt = opt->value;
 662         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 663         return 0;
 664 }
 665
 666 static int open_callback(const struct option *opt, const char *arg, int unset)
 667 {
 668         struct grep_opt *grep_opt = opt->value;
 669         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 670         return 0;
 671 }
 672
 673 static int close_callback(const struct option *opt, const char *arg, int unset)
 674 {
 675         struct grep_opt *grep_opt = opt->value;
 676         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 677         return 0;
 678 }
 679
 680 static int pattern_callback(const struct option *opt, const char *arg,
 681                             int unset)
 682 {
 683         struct grep_opt *grep_opt = opt->value;
 684         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 685         return 0;
 686 }
 687
 688 static int help_callback(const struct option *opt, const char *arg, int unset)
 689 {
 690         return -1;
 691 }
 692
 693 int cmd_grep(int argc, const char **argv, const char *prefix)
 694 {
 695         int hit = 0;
 696         int cached = 0;
 697         int external_grep_allowed = 1;
 698         int seen_dashdash = 0;
 699         struct grep_opt opt;
 700         struct object_array list = { 0, 0, NULL };
 701         const char **paths = NULL;
 702         int i;
 703         int dummy;
 704         struct option options[] = {
 705                 OPT_BOOLEAN(0, "cached", &cached,
 706                         "search in index instead of in the work tree"),
 707                 OPT_GROUP(""),
 708                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
 709                         "show non-matching lines"),
 710                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
 711                         "case insensitive matching"),
 712                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
 713                         "match patterns only at word boundaries"),
 714                 OPT_SET_INT('a', "text", &opt.binary,
 715                         "process binary files as text", GREP_BINARY_TEXT),
 716                 OPT_SET_INT('I', NULL, &opt.binary,
 717                         "don't match patterns in binary files",
 718                         GREP_BINARY_NOMATCH),
 719                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
 720                         "descend at most <depth> levels", PARSE_OPT_NONEG,
 721                         NULL, 1 },
 722                 OPT_GROUP(""),
 723                 OPT_BIT('E', "extended-regexp", &opt.regflags,
 724                         "use extended POSIX regular expressions", REG_EXTENDED),
 725                 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
 726                         "use basic POSIX regular expressions (default)",
 727                         REG_EXTENDED),
 728                 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
 729                         "interpret patterns as fixed strings"),
 730                 OPT_GROUP(""),
 731                 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
 732                 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
 733                 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
 734                 OPT_NEGBIT(0, "full-name", &opt.relative,
 735                         "show filenames relative to top directory", 1),
 736                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
 737                         "show only filenames instead of matching lines"),
 738                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
 739                         "synonym for --files-with-matches"),
 740                 OPT_BOOLEAN('L', "files-without-match",
 741                         &opt.unmatch_name_only,
 742                         "show only the names of files without match"),
 743                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
 744                         "print NUL after filenames"),
 745                 OPT_BOOLEAN('c', "count", &opt.count,
 746                         "show the number of matches instead of matching lines"),
 747                 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
 748                 OPT_GROUP(""),
 749                 OPT_CALLBACK('C', NULL, &opt, "n",
 750                         "show <n> context lines before and after matches",
 751                         context_callback),
 752                 OPT_INTEGER('B', NULL, &opt.pre_context,
 753                         "show <n> context lines before matches"),
 754                 OPT_INTEGER('A', NULL, &opt.post_context,
 755                         "show <n> context lines after matches"),
 756                 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
 757                         context_callback),
 758                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
 759                         "show a line with the function name before matches"),
 760                 OPT_GROUP(""),
 761                 OPT_CALLBACK('f', NULL, &opt, "file",
 762                         "read patterns from file", file_callback),
 763                 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
 764                         "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
 765                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
 766                   "combine patterns specified with -e",
 767                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
 768                 OPT_BOOLEAN(0, "or", &dummy, ""),
 769                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
 770                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
 771                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
 772                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 773                   open_callback },
 774                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
 775                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 776                   close_callback },
 777                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
 778                         "show only matches from files that match all patterns"),
 779                 OPT_GROUP(""),
 780 #if NO_EXTERNAL_GREP
 781                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
 782                         "allow calling of grep(1) (ignored by this build)"),
 783 #else
 784                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
 785                         "allow calling of grep(1) (default)"),
 786 #endif
 787                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
 788                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 789                 OPT_END()
 790         };
 791
 792         memset(&opt, 0, sizeof(opt));
 793         opt.prefix = prefix;
 794         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 795         opt.relative = 1;
 796         opt.pathname = 1;
 797         opt.pattern_tail = &opt.pattern_list;
 798         opt.regflags = REG_NEWLINE;
 799         opt.max_depth = -1;
 800
 801         strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
 802         opt.color = -1;
 803         git_config(grep_config, &opt);
 804         if (opt.color == -1)
 805                 opt.color = git_use_color_default;
 806
 807         /*
 808          * If there is no -- then the paths must exist in the working
 809          * tree.  If there is no explicit pattern specified with -e or
 810          * -f, we take the first unrecognized non option to be the
 811          * pattern, but then what follows it must be zero or more
 812          * valid refs up to the -- (if exists), and then existing
 813          * paths.  If there is an explicit pattern, then the first
 814          * unrecognized non option is the beginning of the refs list
 815          * that continues up to the -- (if exists), and then paths.
 816          */
 817         argc = parse_options(argc, argv, prefix, options, grep_usage,
 818                              PARSE_OPT_KEEP_DASHDASH |
 819                              PARSE_OPT_STOP_AT_NON_OPTION |
 820                              PARSE_OPT_NO_INTERNAL_HELP);
 821
 822         /* First unrecognized non-option token */
 823         if (argc > 0 && !opt.pattern_list) {
 824                 append_grep_pattern(&opt, argv[0], "command line", 0,
 825                                     GREP_PATTERN);
 826                 argv++;
 827                 argc--;
 828         }
 829
 830         if ((opt.color && !opt.color_external) || opt.funcname)
 831                 external_grep_allowed = 0;
 832         if (!opt.pattern_list)
 833                 die("no pattern given.");
 834         if (!opt.fixed && opt.ignore_case)
 835                 opt.regflags |= REG_ICASE;
 836         if ((opt.regflags != REG_NEWLINE) && opt.fixed)
 837                 die("cannot mix --fixed-strings and regexp");
 838         compile_grep_patterns(&opt);
 839
 840         /* Check revs and then paths */
 841         for (i = 0; i < argc; i++) {
 842                 const char *arg = argv[i];
 843                 unsigned char sha1[20];
 844                 /* Is it a rev? */
 845                 if (!get_sha1(arg, sha1)) {
 846                         struct object *object = parse_object(sha1);
 847                         if (!object)
 848                                 die("bad object %s", arg);
 849                         add_object_array(object, arg, &list);
 850                         continue;
 851                 }
 852                 if (!strcmp(arg, "--")) {
 853                         i++;
 854                         seen_dashdash = 1;
 855                 }
 856                 break;
 857         }
 858
 859         /* The rest are paths */
 860         if (!seen_dashdash) {
 861                 int j;
 862                 for (j = i; j < argc; j++)
 863                         verify_filename(prefix, argv[j]);
 864         }
 865
 866         if (i < argc)
 867                 paths = get_pathspec(prefix, argv + i);
 868         else if (prefix) {
 869                 paths = xcalloc(2, sizeof(const char *));
 870                 paths[0] = prefix;
 871                 paths[1] = NULL;
 872         }
 873
 874         if (!list.nr) {
 875                 if (!cached)
 876                         setup_work_tree();
 877                 return !grep_cache(&opt, paths, cached, external_grep_allowed);
 878         }
 879
 880         if (cached)
 881                 die("both --cached and trees are given.");
 882
 883         for (i = 0; i < list.nr; i++) {
 884                 struct object *real_obj;
 885                 real_obj = deref_tag(list.objects[i].item, NULL, 0);
 886                 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
 887                         hit = 1;
 888         }
 889         free_grep_patterns(&opt);
 890         return !hit;
 891 }