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 (!S_ISREG(st.st_mode))
 195                 return 0;
 196         sz = xsize_t(st.st_size);
 197         i = open(filename, O_RDONLY);
 198         if (i < 0)
 199                 goto err_ret;
 200         data = xmalloc(sz + 1);
 201         if (st.st_size != read_in_full(i, data, sz)) {
 202                 error("'%s': short read %s", filename, strerror(errno));
 203                 close(i);
 204                 free(data);
 205                 return 0;
 206         }
 207         close(i);
 208         if (opt->relative && opt->prefix_length)
 209                 filename = quote_path_relative(filename, -1, &buf, opt->prefix);
 210         i = grep_buffer(opt, filename, data, sz);
 211         strbuf_release(&buf);
 212         free(data);
 213         return i;
 214 }
 215
 216 #if !NO_EXTERNAL_GREP
 217 static int exec_grep(int argc, const char **argv)
 218 {
 219         pid_t pid;
 220         int status;
 221
 222         argv[argc] = NULL;
 223         trace_argv_printf(argv, "trace: grep:");
 224         pid = fork();
 225         if (pid < 0)
 226                 return pid;
 227         if (!pid) {
 228                 execvp("grep", (char **) argv);
 229                 exit(255);
 230         }
 231         while (waitpid(pid, &status, 0) < 0) {
 232                 if (errno == EINTR)
 233                         continue;
 234                 return -1;
 235         }
 236         if (WIFEXITED(status)) {
 237                 if (!WEXITSTATUS(status))
 238                         return 1;
 239                 return 0;
 240         }
 241         return -1;
 242 }
 243
 244 #define MAXARGS 1000
 245 #define ARGBUF 4096
 246 #define push_arg(a) do { \
 247         if (nr < MAXARGS) argv[nr++] = (a); \
 248         else die("maximum number of args exceeded"); \
 249         } while (0)
 250
 251 /*
 252  * If you send a singleton filename to grep, it does not give
 253  * the name of the file.  GNU grep has "-H" but we would want
 254  * that behaviour in a portable way.
 255  *
 256  * So we keep two pathnames in argv buffer unsent to grep in
 257  * the main loop if we need to do more than one grep.
 258  */
 259 static int flush_grep(struct grep_opt *opt,
 260                       int argc, int arg0, const char **argv, int *kept)
 261 {
 262         int status;
 263         int count = argc - arg0;
 264         const char *kept_0 = NULL;
 265
 266         if (count <= 2) {
 267                 /*
 268                  * Because we keep at least 2 paths in the call from
 269                  * the main loop (i.e. kept != NULL), and MAXARGS is
 270                  * far greater than 2, this usually is a call to
 271                  * conclude the grep.  However, the user could attempt
 272                  * to overflow the argv buffer by giving too many
 273                  * options to leave very small number of real
 274                  * arguments even for the call in the main loop.
 275                  */
 276                 if (kept)
 277                         die("insanely many options to grep");
 278
 279                 /*
 280                  * If we have two or more paths, we do not have to do
 281                  * anything special, but we need to push /dev/null to
 282                  * get "-H" behaviour of GNU grep portably but when we
 283                  * are not doing "-l" nor "-L" nor "-c".
 284                  */
 285                 if (count == 1 &&
 286                     !opt->name_only &&
 287                     !opt->unmatch_name_only &&
 288                     !opt->count) {
 289                         argv[argc++] = "/dev/null";
 290                         argv[argc] = NULL;
 291                 }
 292         }
 293
 294         else if (kept) {
 295                 /*
 296                  * Called because we found many paths and haven't finished
 297                  * iterating over the cache yet.  We keep two paths
 298                  * for the concluding call.  argv[argc-2] and argv[argc-1]
 299                  * has the last two paths, so save the first one away,
 300                  * replace it with NULL while sending the list to grep,
 301                  * and recover them after we are done.
 302                  */
 303                 *kept = 2;
 304                 kept_0 = argv[argc-2];
 305                 argv[argc-2] = NULL;
 306                 argc -= 2;
 307         }
 308
 309         if (opt->pre_context || opt->post_context) {
 310                 /*
 311                  * grep handles hunk marks between files, but we need to
 312                  * do that ourselves between multiple calls.
 313                  */
 314                 if (opt->show_hunk_mark)
 315                         write_or_die(1, "--\n", 3);
 316                 else
 317                         opt->show_hunk_mark = 1;
 318         }
 319
 320         status = exec_grep(argc, argv);
 321
 322         if (kept_0) {
 323                 /*
 324                  * Then recover them.  Now the last arg is beyond the
 325                  * terminating NULL which is at argc, and the second
 326                  * from the last is what we saved away in kept_0
 327                  */
 328                 argv[arg0++] = kept_0;
 329                 argv[arg0] = argv[argc+1];
 330         }
 331         return status;
 332 }
 333
 334 static void grep_add_color(struct strbuf *sb, const char *escape_seq)
 335 {
 336         size_t orig_len = sb->len;
 337
 338         while (*escape_seq) {
 339                 if (*escape_seq == 'm')
 340                         strbuf_addch(sb, ';');
 341                 else if (*escape_seq != '\033' && *escape_seq  != '[')
 342                         strbuf_addch(sb, *escape_seq);
 343                 escape_seq++;
 344         }
 345         if (sb->len > orig_len && sb->buf[sb->len - 1] == ';')
 346                 strbuf_setlen(sb, sb->len - 1);
 347 }
 348
 349 static int has_skip_worktree_entry(struct grep_opt *opt, const char **paths)
 350 {
 351         int nr;
 352         for (nr = 0; nr < active_nr; nr++) {
 353                 struct cache_entry *ce = active_cache[nr];
 354                 if (!S_ISREG(ce->ce_mode))
 355                         continue;
 356                 if (!pathspec_matches(paths, ce->name, opt->max_depth))
 357                         continue;
 358                 if (ce_skip_worktree(ce))
 359                         return 1;
 360         }
 361         return 0;
 362 }
 363
 364 static int external_grep(struct grep_opt *opt, const char **paths, int cached)
 365 {
 366         int i, nr, argc, hit, len, status;
 367         const char *argv[MAXARGS+1];
 368         char randarg[ARGBUF];
 369         char *argptr = randarg;
 370         struct grep_pat *p;
 371
 372         if (opt->extended || (opt->relative && opt->prefix_length)
 373             || has_skip_worktree_entry(opt, paths))
 374                 return -1;
 375         len = nr = 0;
 376         push_arg("grep");
 377         if (opt->fixed)
 378                 push_arg("-F");
 379         if (opt->linenum)
 380                 push_arg("-n");
 381         if (!opt->pathname)
 382                 push_arg("-h");
 383         if (opt->regflags & REG_EXTENDED)
 384                 push_arg("-E");
 385         if (opt->ignore_case)
 386                 push_arg("-i");
 387         if (opt->binary == GREP_BINARY_NOMATCH)
 388                 push_arg("-I");
 389         if (opt->word_regexp)
 390                 push_arg("-w");
 391         if (opt->name_only)
 392                 push_arg("-l");
 393         if (opt->unmatch_name_only)
 394                 push_arg("-L");
 395         if (opt->null_following_name)
 396                 /* in GNU grep git's "-z" translates to "-Z" */
 397                 push_arg("-Z");
 398         if (opt->count)
 399                 push_arg("-c");
 400         if (opt->post_context || opt->pre_context) {
 401                 if (opt->post_context != opt->pre_context) {
 402                         if (opt->pre_context) {
 403                                 push_arg("-B");
 404                                 len += snprintf(argptr, sizeof(randarg)-len,
 405                                                 "%u", opt->pre_context) + 1;
 406                                 if (sizeof(randarg) <= len)
 407                                         die("maximum length of args exceeded");
 408                                 push_arg(argptr);
 409                                 argptr += len;
 410                         }
 411                         if (opt->post_context) {
 412                                 push_arg("-A");
 413                                 len += snprintf(argptr, sizeof(randarg)-len,
 414                                                 "%u", opt->post_context) + 1;
 415                                 if (sizeof(randarg) <= len)
 416                                         die("maximum length of args exceeded");
 417                                 push_arg(argptr);
 418                                 argptr += len;
 419                         }
 420                 }
 421                 else {
 422                         push_arg("-C");
 423                         len += snprintf(argptr, sizeof(randarg)-len,
 424                                         "%u", opt->post_context) + 1;
 425                         if (sizeof(randarg) <= len)
 426                                 die("maximum length of args exceeded");
 427                         push_arg(argptr);
 428                         argptr += len;
 429                 }
 430         }
 431         for (p = opt->pattern_list; p; p = p->next) {
 432                 push_arg("-e");
 433                 push_arg(p->pattern);
 434         }
 435         if (opt->color) {
 436                 struct strbuf sb = STRBUF_INIT;
 437
 438                 grep_add_color(&sb, opt->color_match);
 439                 setenv("GREP_COLOR", sb.buf, 1);
 440
 441                 strbuf_reset(&sb);
 442                 strbuf_addstr(&sb, "mt=");
 443                 grep_add_color(&sb, opt->color_match);
 444                 strbuf_addstr(&sb, ":sl=:cx=:fn=:ln=:bn=:se=");
 445                 setenv("GREP_COLORS", sb.buf, 1);
 446
 447                 strbuf_release(&sb);
 448
 449                 if (opt->color_external && strlen(opt->color_external) > 0)
 450                         push_arg(opt->color_external);
 451         } else {
 452                 unsetenv("GREP_COLOR");
 453                 unsetenv("GREP_COLORS");
 454         }
 455         unsetenv("GREP_OPTIONS");
 456
 457         hit = 0;
 458         argc = nr;
 459         for (i = 0; i < active_nr; i++) {
 460                 struct cache_entry *ce = active_cache[i];
 461                 char *name;
 462                 int kept;
 463                 if (!S_ISREG(ce->ce_mode))
 464                         continue;
 465                 if (!pathspec_matches(paths, ce->name, opt->max_depth))
 466                         continue;
 467                 name = ce->name;
 468                 if (name[0] == '-') {
 469                         int len = ce_namelen(ce);
 470                         name = xmalloc(len + 3);
 471                         memcpy(name, "./", 2);
 472                         memcpy(name + 2, ce->name, len + 1);
 473                 }
 474                 argv[argc++] = name;
 475                 if (MAXARGS <= argc) {
 476                         status = flush_grep(opt, argc, nr, argv, &kept);
 477                         if (0 < status)
 478                                 hit = 1;
 479                         argc = nr + kept;
 480                 }
 481                 if (ce_stage(ce)) {
 482                         do {
 483                                 i++;
 484                         } while (i < active_nr &&
 485                                  !strcmp(ce->name, active_cache[i]->name));
 486                         i--; /* compensate for loop control */
 487                 }
 488         }
 489         if (argc > nr) {
 490                 status = flush_grep(opt, argc, nr, argv, NULL);
 491                 if (0 < status)
 492                         hit = 1;
 493         }
 494         return hit;
 495 }
 496 #endif
 497
 498 static int grep_cache(struct grep_opt *opt, const char **paths, int cached,
 499                       int external_grep_allowed)
 500 {
 501         int hit = 0;
 502         int nr;
 503         read_cache();
 504
 505 #if !NO_EXTERNAL_GREP
 506         /*
 507          * Use the external "grep" command for the case where
 508          * we grep through the checked-out files. It tends to
 509          * be a lot more optimized
 510          */
 511         if (!cached && external_grep_allowed) {
 512                 hit = external_grep(opt, paths, cached);
 513                 if (hit >= 0)
 514                         return hit;
 515                 hit = 0;
 516         }
 517 #endif
 518
 519         for (nr = 0; nr < active_nr; nr++) {
 520                 struct cache_entry *ce = active_cache[nr];
 521                 if (!S_ISREG(ce->ce_mode))
 522                         continue;
 523                 if (!pathspec_matches(paths, ce->name, opt->max_depth))
 524                         continue;
 525                 /*
 526                  * If CE_VALID is on, we assume worktree file and its cache entry
 527                  * are identical, even if worktree file has been modified, so use
 528                  * cache version instead
 529                  */
 530                 if (cached || (ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) {
 531                         if (ce_stage(ce))
 532                                 continue;
 533                         hit |= grep_sha1(opt, ce->sha1, ce->name, 0);
 534                 }
 535                 else
 536                         hit |= grep_file(opt, ce->name);
 537                 if (ce_stage(ce)) {
 538                         do {
 539                                 nr++;
 540                         } while (nr < active_nr &&
 541                                  !strcmp(ce->name, active_cache[nr]->name));
 542                         nr--; /* compensate for loop control */
 543                 }
 544         }
 545         free_grep_patterns(opt);
 546         return hit;
 547 }
 548
 549 static int grep_tree(struct grep_opt *opt, const char **paths,
 550                      struct tree_desc *tree,
 551                      const char *tree_name, const char *base)
 552 {
 553         int len;
 554         int hit = 0;
 555         struct name_entry entry;
 556         char *down;
 557         int tn_len = strlen(tree_name);
 558         struct strbuf pathbuf;
 559
 560         strbuf_init(&pathbuf, PATH_MAX + tn_len);
 561
 562         if (tn_len) {
 563                 strbuf_add(&pathbuf, tree_name, tn_len);
 564                 strbuf_addch(&pathbuf, ':');
 565                 tn_len = pathbuf.len;
 566         }
 567         strbuf_addstr(&pathbuf, base);
 568         len = pathbuf.len;
 569
 570         while (tree_entry(tree, &entry)) {
 571                 int te_len = tree_entry_len(entry.path, entry.sha1);
 572                 pathbuf.len = len;
 573                 strbuf_add(&pathbuf, entry.path, te_len);
 574
 575                 if (S_ISDIR(entry.mode))
 576                         /* Match "abc/" against pathspec to
 577                          * decide if we want to descend into "abc"
 578                          * directory.
 579                          */
 580                         strbuf_addch(&pathbuf, '/');
 581
 582                 down = pathbuf.buf + tn_len;
 583                 if (!pathspec_matches(paths, down, opt->max_depth))
 584                         ;
 585                 else if (S_ISREG(entry.mode))
 586                         hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
 587                 else if (S_ISDIR(entry.mode)) {
 588                         enum object_type type;
 589                         struct tree_desc sub;
 590                         void *data;
 591                         unsigned long size;
 592
 593                         data = read_sha1_file(entry.sha1, &type, &size);
 594                         if (!data)
 595                                 die("unable to read tree (%s)",
 596                                     sha1_to_hex(entry.sha1));
 597                         init_tree_desc(&sub, data, size);
 598                         hit |= grep_tree(opt, paths, &sub, tree_name, down);
 599                         free(data);
 600                 }
 601         }
 602         strbuf_release(&pathbuf);
 603         return hit;
 604 }
 605
 606 static int grep_object(struct grep_opt *opt, const char **paths,
 607                        struct object *obj, const char *name)
 608 {
 609         if (obj->type == OBJ_BLOB)
 610                 return grep_sha1(opt, obj->sha1, name, 0);
 611         if (obj->type == OBJ_COMMIT || obj->type == OBJ_TREE) {
 612                 struct tree_desc tree;
 613                 void *data;
 614                 unsigned long size;
 615                 int hit;
 616                 data = read_object_with_reference(obj->sha1, tree_type,
 617                                                   &size, NULL);
 618                 if (!data)
 619                         die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
 620                 init_tree_desc(&tree, data, size);
 621                 hit = grep_tree(opt, paths, &tree, name, "");
 622                 free(data);
 623                 return hit;
 624         }
 625         die("unable to grep from object of type %s", typename(obj->type));
 626 }
 627
 628 static int context_callback(const struct option *opt, const char *arg,
 629                             int unset)
 630 {
 631         struct grep_opt *grep_opt = opt->value;
 632         int value;
 633         const char *endp;
 634
 635         if (unset) {
 636                 grep_opt->pre_context = grep_opt->post_context = 0;
 637                 return 0;
 638         }
 639         value = strtol(arg, (char **)&endp, 10);
 640         if (*endp) {
 641                 return error("switch `%c' expects a numerical value",
 642                              opt->short_name);
 643         }
 644         grep_opt->pre_context = grep_opt->post_context = value;
 645         return 0;
 646 }
 647
 648 static int file_callback(const struct option *opt, const char *arg, int unset)
 649 {
 650         struct grep_opt *grep_opt = opt->value;
 651         FILE *patterns;
 652         int lno = 0;
 653         struct strbuf sb = STRBUF_INIT;
 654
 655         patterns = fopen(arg, "r");
 656         if (!patterns)
 657                 die_errno("cannot open '%s'", arg);
 658         while (strbuf_getline(&sb, patterns, '\n') == 0) {
 659                 /* ignore empty line like grep does */
 660                 if (sb.len == 0)
 661                         continue;
 662                 append_grep_pattern(grep_opt, strbuf_detach(&sb, NULL), arg,
 663                                     ++lno, GREP_PATTERN);
 664         }
 665         fclose(patterns);
 666         strbuf_release(&sb);
 667         return 0;
 668 }
 669
 670 static int not_callback(const struct option *opt, const char *arg, int unset)
 671 {
 672         struct grep_opt *grep_opt = opt->value;
 673         append_grep_pattern(grep_opt, "--not", "command line", 0, GREP_NOT);
 674         return 0;
 675 }
 676
 677 static int and_callback(const struct option *opt, const char *arg, int unset)
 678 {
 679         struct grep_opt *grep_opt = opt->value;
 680         append_grep_pattern(grep_opt, "--and", "command line", 0, GREP_AND);
 681         return 0;
 682 }
 683
 684 static int open_callback(const struct option *opt, const char *arg, int unset)
 685 {
 686         struct grep_opt *grep_opt = opt->value;
 687         append_grep_pattern(grep_opt, "(", "command line", 0, GREP_OPEN_PAREN);
 688         return 0;
 689 }
 690
 691 static int close_callback(const struct option *opt, const char *arg, int unset)
 692 {
 693         struct grep_opt *grep_opt = opt->value;
 694         append_grep_pattern(grep_opt, ")", "command line", 0, GREP_CLOSE_PAREN);
 695         return 0;
 696 }
 697
 698 static int pattern_callback(const struct option *opt, const char *arg,
 699                             int unset)
 700 {
 701         struct grep_opt *grep_opt = opt->value;
 702         append_grep_pattern(grep_opt, arg, "-e option", 0, GREP_PATTERN);
 703         return 0;
 704 }
 705
 706 static int help_callback(const struct option *opt, const char *arg, int unset)
 707 {
 708         return -1;
 709 }
 710
 711 int cmd_grep(int argc, const char **argv, const char *prefix)
 712 {
 713         int hit = 0;
 714         int cached = 0;
 715         int external_grep_allowed = 1;
 716         int seen_dashdash = 0;
 717         struct grep_opt opt;
 718         struct object_array list = { 0, 0, NULL };
 719         const char **paths = NULL;
 720         int i;
 721         int dummy;
 722         struct option options[] = {
 723                 OPT_BOOLEAN(0, "cached", &cached,
 724                         "search in index instead of in the work tree"),
 725                 OPT_GROUP(""),
 726                 OPT_BOOLEAN('v', "invert-match", &opt.invert,
 727                         "show non-matching lines"),
 728                 OPT_BOOLEAN('i', "ignore-case", &opt.ignore_case,
 729                         "case insensitive matching"),
 730                 OPT_BOOLEAN('w', "word-regexp", &opt.word_regexp,
 731                         "match patterns only at word boundaries"),
 732                 OPT_SET_INT('a', "text", &opt.binary,
 733                         "process binary files as text", GREP_BINARY_TEXT),
 734                 OPT_SET_INT('I', NULL, &opt.binary,
 735                         "don't match patterns in binary files",
 736                         GREP_BINARY_NOMATCH),
 737                 { OPTION_INTEGER, 0, "max-depth", &opt.max_depth, "depth",
 738                         "descend at most <depth> levels", PARSE_OPT_NONEG,
 739                         NULL, 1 },
 740                 OPT_GROUP(""),
 741                 OPT_BIT('E', "extended-regexp", &opt.regflags,
 742                         "use extended POSIX regular expressions", REG_EXTENDED),
 743                 OPT_NEGBIT('G', "basic-regexp", &opt.regflags,
 744                         "use basic POSIX regular expressions (default)",
 745                         REG_EXTENDED),
 746                 OPT_BOOLEAN('F', "fixed-strings", &opt.fixed,
 747                         "interpret patterns as fixed strings"),
 748                 OPT_GROUP(""),
 749                 OPT_BOOLEAN('n', NULL, &opt.linenum, "show line numbers"),
 750                 OPT_NEGBIT('h', NULL, &opt.pathname, "don't show filenames", 1),
 751                 OPT_BIT('H', NULL, &opt.pathname, "show filenames", 1),
 752                 OPT_NEGBIT(0, "full-name", &opt.relative,
 753                         "show filenames relative to top directory", 1),
 754                 OPT_BOOLEAN('l', "files-with-matches", &opt.name_only,
 755                         "show only filenames instead of matching lines"),
 756                 OPT_BOOLEAN(0, "name-only", &opt.name_only,
 757                         "synonym for --files-with-matches"),
 758                 OPT_BOOLEAN('L', "files-without-match",
 759                         &opt.unmatch_name_only,
 760                         "show only the names of files without match"),
 761                 OPT_BOOLEAN('z', "null", &opt.null_following_name,
 762                         "print NUL after filenames"),
 763                 OPT_BOOLEAN('c', "count", &opt.count,
 764                         "show the number of matches instead of matching lines"),
 765                 OPT_SET_INT(0, "color", &opt.color, "highlight matches", 1),
 766                 OPT_GROUP(""),
 767                 OPT_CALLBACK('C', NULL, &opt, "n",
 768                         "show <n> context lines before and after matches",
 769                         context_callback),
 770                 OPT_INTEGER('B', NULL, &opt.pre_context,
 771                         "show <n> context lines before matches"),
 772                 OPT_INTEGER('A', NULL, &opt.post_context,
 773                         "show <n> context lines after matches"),
 774                 OPT_NUMBER_CALLBACK(&opt, "shortcut for -C NUM",
 775                         context_callback),
 776                 OPT_BOOLEAN('p', "show-function", &opt.funcname,
 777                         "show a line with the function name before matches"),
 778                 OPT_GROUP(""),
 779                 OPT_CALLBACK('f', NULL, &opt, "file",
 780                         "read patterns from file", file_callback),
 781                 { OPTION_CALLBACK, 'e', NULL, &opt, "pattern",
 782                         "match <pattern>", PARSE_OPT_NONEG, pattern_callback },
 783                 { OPTION_CALLBACK, 0, "and", &opt, NULL,
 784                   "combine patterns specified with -e",
 785                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, and_callback },
 786                 OPT_BOOLEAN(0, "or", &dummy, ""),
 787                 { OPTION_CALLBACK, 0, "not", &opt, NULL, "",
 788                   PARSE_OPT_NOARG | PARSE_OPT_NONEG, not_callback },
 789                 { OPTION_CALLBACK, '(', NULL, &opt, NULL, "",
 790                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 791                   open_callback },
 792                 { OPTION_CALLBACK, ')', NULL, &opt, NULL, "",
 793                   PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_NODASH,
 794                   close_callback },
 795                 OPT_BOOLEAN(0, "all-match", &opt.all_match,
 796                         "show only matches from files that match all patterns"),
 797                 OPT_GROUP(""),
 798 #if NO_EXTERNAL_GREP
 799                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
 800                         "allow calling of grep(1) (ignored by this build)"),
 801 #else
 802                 OPT_BOOLEAN(0, "ext-grep", &external_grep_allowed,
 803                         "allow calling of grep(1) (default)"),
 804 #endif
 805                 { OPTION_CALLBACK, 0, "help-all", &options, NULL, "show usage",
 806                   PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 807                 OPT_END()
 808         };
 809
 810         /*
 811          * 'git grep -h', unlike 'git grep -h <pattern>', is a request
 812          * to show usage information and exit.
 813          */
 814         if (argc == 2 && !strcmp(argv[1], "-h"))
 815                 usage_with_options(grep_usage, options);
 816
 817         memset(&opt, 0, sizeof(opt));
 818         opt.prefix = prefix;
 819         opt.prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
 820         opt.relative = 1;
 821         opt.pathname = 1;
 822         opt.pattern_tail = &opt.pattern_list;
 823         opt.regflags = REG_NEWLINE;
 824         opt.max_depth = -1;
 825
 826         strcpy(opt.color_match, GIT_COLOR_RED GIT_COLOR_BOLD);
 827         opt.color = -1;
 828         git_config(grep_config, &opt);
 829         if (opt.color == -1)
 830                 opt.color = git_use_color_default;
 831
 832         /*
 833          * If there is no -- then the paths must exist in the working
 834          * tree.  If there is no explicit pattern specified with -e or
 835          * -f, we take the first unrecognized non option to be the
 836          * pattern, but then what follows it must be zero or more
 837          * valid refs up to the -- (if exists), and then existing
 838          * paths.  If there is an explicit pattern, then the first
 839          * unrecognized non option is the beginning of the refs list
 840          * that continues up to the -- (if exists), and then paths.
 841          */
 842         argc = parse_options(argc, argv, prefix, options, grep_usage,
 843                              PARSE_OPT_KEEP_DASHDASH |
 844                              PARSE_OPT_STOP_AT_NON_OPTION |
 845                              PARSE_OPT_NO_INTERNAL_HELP);
 846
 847         /* First unrecognized non-option token */
 848         if (argc > 0 && !opt.pattern_list) {
 849                 append_grep_pattern(&opt, argv[0], "command line", 0,
 850                                     GREP_PATTERN);
 851                 argv++;
 852                 argc--;
 853         }
 854
 855         if ((opt.color && !opt.color_external) || opt.funcname)
 856                 external_grep_allowed = 0;
 857         if (!opt.pattern_list)
 858                 die("no pattern given.");
 859         if (!opt.fixed && opt.ignore_case)
 860                 opt.regflags |= REG_ICASE;
 861         if ((opt.regflags != REG_NEWLINE) && opt.fixed)
 862                 die("cannot mix --fixed-strings and regexp");
 863         compile_grep_patterns(&opt);
 864
 865         /* Check revs and then paths */
 866         for (i = 0; i < argc; i++) {
 867                 const char *arg = argv[i];
 868                 unsigned char sha1[20];
 869                 /* Is it a rev? */
 870                 if (!get_sha1(arg, sha1)) {
 871                         struct object *object = parse_object(sha1);
 872                         if (!object)
 873                                 die("bad object %s", arg);
 874                         add_object_array(object, arg, &list);
 875                         continue;
 876                 }
 877                 if (!strcmp(arg, "--")) {
 878                         i++;
 879                         seen_dashdash = 1;
 880                 }
 881                 break;
 882         }
 883
 884         /* The rest are paths */
 885         if (!seen_dashdash) {
 886                 int j;
 887                 for (j = i; j < argc; j++)
 888                         verify_filename(prefix, argv[j]);
 889         }
 890
 891         if (i < argc)
 892                 paths = get_pathspec(prefix, argv + i);
 893         else if (prefix) {
 894                 paths = xcalloc(2, sizeof(const char *));
 895                 paths[0] = prefix;
 896                 paths[1] = NULL;
 897         }
 898
 899         if (!list.nr) {
 900                 if (!cached)
 901                         setup_work_tree();
 902                 return !grep_cache(&opt, paths, cached, external_grep_allowed);
 903         }
 904
 905         if (cached)
 906                 die("both --cached and trees are given.");
 907
 908         for (i = 0; i < list.nr; i++) {
 909                 struct object *real_obj;
 910                 real_obj = deref_tag(list.objects[i].item, NULL, 0);
 911                 if (grep_object(&opt, paths, real_obj, list.objects[i].name))
 912                         hit = 1;
 913         }
 914         free_grep_patterns(&opt);
 915         return !hit;
 916 }