Implement relevance ranked boolean searching on a full text index of

item and comment data.  Whew!

It's not pretty yet.  And you have to manually update the index
currently in admin/maintenance.  But it works.

modules/comment/helpers/comment_search.php

@@ -0,0 +1,34 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2008 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+class Comment_Search_Core {
+  static function item_index_data($item) {
+    $data = array();
+    foreach (Database::instance()
+             ->select("text")
+             ->from("comments")
+             ->where("item_id", $item->id)
+             ->get()
+             ->as_array() as $row) {
+      $data[] = $row->text;
+    }
+    return join(" ", $data);
+  }
+}