From 7df86762eb721fd1b2af466454f0d866b39b75e4 Mon Sep 17 00:00:00 2001
From: trustmaster <trustmaster@kodigy.com>
Date: Sat, 13 Aug 2011 12:20:58 +0400
Subject: [PATCH] Fix for multi-word tags search

---
 plugins/tags/inc/functions.php | 29 +++++++++++++++++++++++++----
 plugins/tags/tags.php          | 24 ++++++------------------
 2 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/plugins/tags/inc/functions.php b/plugins/tags/inc/functions.php
index 92567150b..201f24b8e 100644
--- a/plugins/tags/inc/functions.php
+++ b/plugins/tags/inc/functions.php
@@ -13,11 +13,16 @@
  * Parses search string into SQL query
  *
  * @param string $qs User input
+ * @param array $join_columns Columns to be joined by on tag_item match in subquery
  * @return string
  */
-function sed_tag_parse_query($qs)
+function sed_tag_parse_query($qs, $join_columns)
 {
 	global $db_tag_references;
+	if (is_string($join_columns))
+	{
+		$join_columns = array($join_columns);
+	}
 	$tokens1 = explode(';', $qs);
 	$tokens1 = array_map('trim', $tokens1);
 	$cnt1 = count($tokens1);
@@ -47,7 +52,13 @@ function sed_tag_parse_query($qs)
 				}
 				else
 				{
-					$tokens2[$j] = "EXISTS (SELECT * FROM $db_tag_references AS r{$i}_{$j} WHERE r{$i}_{$j}.tag_item = p.page_id AND r{$i}_{$j}.tag $op)";
+					$join_conds = array();
+					foreach ($join_columns as $col)
+					{
+						$join_conds[] = "r{$i}_{$j}.tag_item = $col"; 
+					}
+					$join_cond = implode(' OR ', $join_conds);
+					$tokens2[$j] = "EXISTS (SELECT * FROM $db_tag_references AS r{$i}_{$j} WHERE ($join_cond) AND r{$i}_{$j}.tag $op)";
 				}
 			}
 			else
@@ -109,11 +120,16 @@ function sed_tag_search_form($area = 'all')
 /**
  * Search by tag in pages
  *
- * @param string $query Search query as SQL condition
+ * @param string $query User-entered query string
  */
 function sed_tag_search_pages($query)
 {
 	global $t, $L, $lang, $cfg, $usr, $qs, $d, $db_tag_references, $db_pages, $o, $row;
+	$query = sed_tag_parse_query($query, 'p.page_id');
+	if (empty($query))
+	{
+		return;
+	}
 	$totalitems = sed_sql_result(sed_sql_query("SELECT COUNT(*)
 		FROM $db_tag_references AS r LEFT JOIN $db_pages AS p
 			ON r.tag_item = p.page_id
@@ -185,11 +201,16 @@ function sed_tag_search_pages($query)
 /**
  * Search by tag in forums
  *
- * @param string $query Search query as SQL condition
+ * @param string $query User-entered search query
  */
 function sed_tag_search_forums($query)
 {
 	global $t, $L, $lang, $cfg, $usr, $qs, $d, $db_tag_references, $db_forum_topics, $db_forum_sections, $o, $row;
+	$query = sed_tag_parse_query($query, 't.ft_id');
+	if (empty($query))
+	{
+		return;
+	}
 	$totalitems = sed_sql_result(sed_sql_query("SELECT COUNT(*)
 		FROM $db_tag_references AS r LEFT JOIN $db_forum_topics AS t
 			ON r.tag_item = t.ft_id
diff --git a/plugins/tags/tags.php b/plugins/tags/tags.php
index 38ab0e2ff..e6815df30 100644
--- a/plugins/tags/tags.php
+++ b/plugins/tags/tags.php
@@ -71,11 +71,7 @@
 	else
 	{
 		// Search results
-		$query = sed_tag_parse_query($qs);
-		if(!empty($query))
-		{
-			sed_tag_search_pages($query);
-		}
+		sed_tag_search_pages($qs);
 	}
 }
 elseif ($a == 'forums')
@@ -88,11 +84,7 @@
 	else
 	{
 		// Search results
-		$query = sed_tag_parse_query($qs);
-		if(!empty($query))
-		{
-			sed_tag_search_forums($query);
-		}
+		sed_tag_search_forums($qs);
 	}
 }
 elseif ($a == 'all')
@@ -105,16 +97,12 @@
 	else
 	{
 		// Search results
-		$query = sed_tag_parse_query($qs);
-		if(!empty($query))
+		foreach ($tag_areas as $area)
 		{
-			foreach ($tag_areas as $area)
+			$tag_search_callback = 'sed_tag_search_' . $area;
+			if (function_exists($tag_search_callback))
 			{
-				$tag_search_callback = 'sed_tag_search_' . $area;
-				if (function_exists($tag_search_callback))
-				{
-					$tag_search_callback($query);
-				}
+				$tag_search_callback($qs);
 			}
 		}
 	}