diff options
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | builtin-grep.c | 454 | ||||
| -rw-r--r-- | builtin.h | 1 | ||||
| -rw-r--r-- | git.c | 1 |
4 files changed, 457 insertions, 1 deletions
@@ -214,7 +214,7 @@ LIB_OBJS = \ $(DIFF_OBJS) BUILTIN_OBJS = \ - builtin-log.o builtin-help.o + builtin-log.o builtin-help.o builtin-grep.o GITLIBS = $(LIB_FILE) $(XDIFF_LIB) LIBS = $(GITLIBS) -lz diff --git a/builtin-grep.c b/builtin-grep.c new file mode 100644 index 000000000..36150bf4e --- /dev/null +++ b/builtin-grep.c @@ -0,0 +1,454 @@ +/* + * Builtin "git grep" + * + * Copyright (c) 2006 Junio C Hamano + */ +#include "cache.h" +#include "blob.h" +#include "tree.h" +#include "commit.h" +#include "tag.h" +#include "diff.h" +#include "revision.h" +#include "builtin.h" +#include <regex.h> + +static int pathspec_matches(struct diff_options *opt, const char *name) +{ + int i, j; + int namelen; + if (!opt->nr_paths) + return 1; + namelen = strlen(name); + for (i = 0; i < opt->nr_paths; i++) { + const char *match = opt->paths[i]; + int matchlen = opt->pathlens[i]; + if (matchlen <= namelen) { + if (!strncmp(name, match, matchlen)) + return 1; + continue; + } + /* If name is "Documentation" and pathspec is + * "Documentation/", they should match. Maybe + * we would want to strip it in get_pathspec()??? + */ + if (strncmp(name, match, namelen)) + continue; + for (j = namelen; j < matchlen; j++) + if (match[j] != '/') + break; + if (matchlen <= j) + return 1; + } + return 0; +} + +struct grep_opt { + const char *pattern; + regex_t regexp; + unsigned linenum:1; + unsigned invert:1; + int regflags; + unsigned pre_context; + unsigned post_context; +}; + +static char *end_of_line(char *cp, unsigned long *left) +{ + unsigned long l = *left; + while (l && *cp != '\n') { + l--; + cp++; + } + *left = l; + return cp; +} + +static void show_line(struct grep_opt *opt, const char *bol, const char *eol, + const char *name, unsigned lno, char sign) +{ + printf("%s%c", name, sign); + if (opt->linenum) + printf("%d%c", lno, sign); + printf("%.*s\n", eol-bol, bol); +} + +static int grep_buffer(struct grep_opt *opt, const char *name, + char *buf, unsigned long size) +{ + char *bol = buf; + unsigned long left = size; + unsigned lno = 1; + struct pre_context_line { + char *bol; + char *eol; + } *prev = NULL, *pcl; + unsigned last_hit = 0; + unsigned last_shown = 0; + const char *hunk_mark = ""; + + if (opt->pre_context) + prev = xcalloc(opt->pre_context, sizeof(*prev)); + if (opt->pre_context || opt->post_context) + hunk_mark = "--\n"; + + while (left) { + regmatch_t pmatch[10]; + char *eol, ch; + int hit; + + eol = end_of_line(bol, &left); + ch = *eol; + *eol = 0; + + hit = !regexec(&opt->regexp, bol, ARRAY_SIZE(pmatch), + pmatch, 0); + if (opt->invert) + hit = !hit; + if (hit) { + /* Hit at this line. If we haven't shown the + * pre-context lines, we would need to show them. + */ + if (opt->pre_context) { + unsigned from; + if (opt->pre_context < lno) + from = lno - opt->pre_context; + else + from = 1; + if (from <= last_shown) + from = last_shown + 1; + if (last_shown && from != last_shown + 1) + printf(hunk_mark); + while (from < lno) { + pcl = &prev[lno-from-1]; + show_line(opt, pcl->bol, pcl->eol, + name, from, '-'); + from++; + } + last_shown = lno-1; + } + if (last_shown && lno != last_shown + 1) + printf(hunk_mark); + show_line(opt, bol, eol, name, lno, ':'); + last_shown = last_hit = lno; + } + else if (last_hit && + lno <= last_hit + opt->post_context) { + /* If the last hit is within the post context, + * we need to show this line. + */ + if (last_shown && lno != last_shown + 1) + printf(hunk_mark); + show_line(opt, bol, eol, name, lno, '-'); + last_shown = lno; + } + if (opt->pre_context) { + memmove(prev+1, prev, + (opt->pre_context-1) * sizeof(*prev)); + prev->bol = bol; + prev->eol = eol; + } + *eol = ch; + bol = eol + 1; + left--; + lno++; + } + return !!last_hit; +} + +static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name) +{ + unsigned long size; + char *data; + char type[20]; + int hit; + data = read_sha1_file(sha1, type, &size); + if (!data) { + error("'%s': unable to read %s", name, sha1_to_hex(sha1)); + return 0; + } + hit = grep_buffer(opt, name, data, size); + free(data); + return hit; +} + +static int grep_file(struct grep_opt *opt, const char *filename) +{ + struct stat st; + int i; + char *data; + if (lstat(filename, &st) < 0) { + err_ret: + if (errno != ENOENT) + error("'%s': %s", filename, strerror(errno)); + return 0; + } + if (!st.st_size) + return 0; /* empty file -- no grep hit */ + if (!S_ISREG(st.st_mode)) + return 0; + i = open(filename, O_RDONLY); + if (i < 0) + goto err_ret; + data = xmalloc(st.st_size + 1); + if (st.st_size != xread(i, data, st.st_size)) { + error("'%s': short read %s", filename, strerror(errno)); + close(i); + free(data); + return 0; + } + close(i); + i = grep_buffer(opt, filename, data, st.st_size); + free(data); + return i; +} + +static int grep_cache(struct grep_opt *opt, struct rev_info *revs, int cached) +{ + int hit = 0; + int nr; + read_cache(); + + for (nr = 0; nr < active_nr; nr++) { + struct cache_entry *ce = active_cache[nr]; + if (ce_stage(ce) || !S_ISREG(ntohl(ce->ce_mode))) + continue; + if (!pathspec_matches(&revs->diffopt, ce->name)) + continue; + if (cached) + hit |= grep_sha1(opt, ce->sha1, ce->name); + else + hit |= grep_file(opt, ce->name); + } + return hit; +} + +static int grep_tree(struct grep_opt *opt, struct rev_info *revs, + struct tree_desc *tree, + const char *tree_name, const char *base) +{ + unsigned mode; + int len; + int hit = 0; + const char *path; + const unsigned char *sha1; + char *down_base; + char *path_buf = xmalloc(PATH_MAX + strlen(tree_name) + 100); + + if (tree_name[0]) { + int offset = sprintf(path_buf, "%s:", tree_name); + down_base = path_buf + offset; + strcat(down_base, base); + } + else { + down_base = path_buf; + strcpy(down_base, base); + } + len = strlen(path_buf); + + while (tree->size) { + int pathlen; + sha1 = tree_entry_extract(tree, &path, &mode); + pathlen = strlen(path); + strcpy(path_buf + len, path); + + if (!pathspec_matches(&revs->diffopt, down_base)) + ; + else if (S_ISREG(mode)) + hit |= grep_sha1(opt, sha1, path_buf); + else if (S_ISDIR(mode)) { + char type[20]; + struct tree_desc sub; + void *data; + data = read_sha1_file(sha1, type, &sub.size); + if (!data) + die("unable to read tree (%s)", + sha1_to_hex(sha1)); + strcpy(path_buf + len + pathlen, "/"); + sub.buf = data; + hit = grep_tree(opt, revs, &sub, tree_name, down_base); + free(data); + } + update_tree_entry(tree); + } + return hit; +} + +static int grep_object(struct grep_opt *opt, struct rev_info *revs, + struct object *obj, const char *name) +{ + if (!strcmp(obj->type, blob_type)) + return grep_sha1(opt, obj->sha1, name); + if (!strcmp(obj->type, commit_type) || + !strcmp(obj->type, tree_type)) { + struct tree_desc tree; + void *data; + int hit; + data = read_object_with_reference(obj->sha1, tree_type, + &tree.size, NULL); + if (!data) + die("unable to read tree (%s)", sha1_to_hex(obj->sha1)); + tree.buf = data; + hit = grep_tree(opt, revs, &tree, name, ""); + free(data); + return hit; + } + die("unable to grep from object of type %s", obj->type); +} + +static const char builtin_grep_usage[] = +"git-grep <option>* <rev>* [-e] <pattern> [<path>...]"; + +int cmd_grep(int argc, const char **argv, char **envp) +{ + struct rev_info rev; + const char **dst, **src; + int err; + int hit = 0; + int no_more_arg = 0; + int seen_range = 0; + int seen_noncommit = 0; + int cached = 0; + struct grep_opt opt; + struct object_list *list; + + memset(&opt, 0, sizeof(opt)); + opt.regflags = REG_NEWLINE; + + /* + * Interpret and remove the grep options upfront. Sigh... + */ + for (dst = src = &argv[1]; src < argc + argv; ) { + const char *arg = *src++; + if (!no_more_arg) { + if (!strcmp("--", arg)) { + no_more_arg = 1; + *dst++ = arg; + continue; + } + if (!strcmp("--cached", arg)) { + cached = 1; + continue; + } + if (!strcmp("-i", arg) || + !strcmp("--ignore-case", arg)) { + opt.regflags |= REG_ICASE; + continue; + } + if (!strcmp("-v", arg) || + !strcmp("--invert-match", arg)) { + opt.invert = 1; + continue; + } + if (!strcmp("-E", arg) || + !strcmp("--extended-regexp", arg)) { + opt.regflags |= REG_EXTENDED; + continue; + } + if (!strcmp("-G", arg) || + !strcmp("--basic-regexp", arg)) { + opt.regflags &= ~REG_EXTENDED; + continue; + } + if (!strcmp("-e", arg)) { + if (src < argc + argv) { + opt.pattern = *src++; + continue; + } + usage(builtin_grep_usage); + } + if (!strcmp("-n", arg)) { + opt.linenum = 1; + continue; + } + if (!strcmp("-H", arg)) { + /* We always show the pathname, so this + * is a noop. + */ + continue; + } + if (!strcmp("-A", arg) || + !strcmp("-B", arg) || + !strcmp("-C", arg)) { + unsigned num; + if ((argc + argv <= src) || + sscanf(*src++, "%u", &num) != 1) + usage(builtin_grep_usage); + switch (arg[1]) { + case 'A': + opt.post_context = num; + break; + case 'C': + opt.post_context = num; + case 'B': + opt.pre_context = num; + break; + } + continue; + } + } + *dst++ = arg; + } + if (!opt.pattern) + die("no pattern given."); + + err = regcomp(&opt.regexp, opt.pattern, opt.regflags); + if (err) { + char errbuf[1024]; + regerror(err, &opt.regexp, errbuf, 1024); + regfree(&opt.regexp); + die("'%s': %s", opt.pattern, errbuf); + } + + init_revisions(&rev); + *dst = NULL; + argc = setup_revisions(dst - argv, argv, &rev, NULL); + + /* + * Do not walk "grep -e foo master next pu -- Documentation/" + * but do walk "grep -e foo master..next -- Documentation/". + * Ranged request mixed with a blob or tree object, like + * "grep -e foo v1.0.0:Documentation/ master..next" + * so detect that and complain. + */ + for (list = rev.pending_objects; list; list = list->next) { + struct object *real_obj; + if (list->item->flags & UNINTERESTING) + seen_range = 1; + real_obj = deref_tag(list->item, NULL, 0); + if (strcmp(real_obj->type, commit_type)) + seen_noncommit = 1; + } + if (!rev.pending_objects) + return !grep_cache(&opt, &rev, cached); + if (cached) + die("both --cached and revisions given."); + + if (seen_range && seen_noncommit) + die("both A..B and non commit are given."); + if (seen_range) { + struct commit *commit; + prepare_revision_walk(&rev); + while ((commit = get_revision(&rev)) != NULL) { + unsigned char *sha1 = commit->object.sha1; + const char *n = find_unique_abbrev(sha1, rev.abbrev); + char rev_name[41]; + strcpy(rev_name, n); + if (grep_object(&opt, &rev, &commit->object, rev_name)) + hit = 1; + commit->buffer = NULL; + } + return !hit; + } + + /* all of them are non-commit; do not walk, and + * do not lose their names. + */ + for (list = rev.pending_objects; list; list = list->next) { + struct object *real_obj; + real_obj = deref_tag(list->item, NULL, 0); + if (grep_object(&opt, &rev, real_obj, list->name)) + hit = 1; + } + return !hit; +} @@ -19,5 +19,6 @@ extern int cmd_version(int argc, const char **argv, char **envp); extern int cmd_whatchanged(int argc, const char **argv, char **envp); extern int cmd_show(int argc, const char **argv, char **envp); extern int cmd_log(int argc, const char **argv, char **envp); +extern int cmd_grep(int argc, const char **argv, char **envp); #endif @@ -46,6 +46,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp) { "log", cmd_log }, { "whatchanged", cmd_whatchanged }, { "show", cmd_show }, + { "grep", cmd_grep }, }; int i; |