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-rw-r--r--builtin-grep.c454
1 files changed, 454 insertions, 0 deletions
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;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-06-27 18:51:27 +0000