Index: branches/RC/core/units/modules/modules_tag_processor.php
===================================================================
diff -u -r8929 -r10832
--- branches/RC/core/units/modules/modules_tag_processor.php	(.../modules_tag_processor.php)	(revision 8929)
+++ branches/RC/core/units/modules/modules_tag_processor.php	(.../modules_tag_processor.php)	(revision 10832)
@@ -1,12 +1,87 @@
 <?php
 
-class ModulesTagProcessor extends kDBTagProcessor  {
+	class ModulesTagProcessor extends kDBTagProcessor  {
 
-	function ModuleInstalled($params)
-	{
-		return $this->Application->isModuleEnabled($params['name']);
-	}
-	
-}
+		function ModuleInstalled($params)
+		{
+			return $this->Application->isModuleEnabled($params['name']);
+		}
 
-?>
\ No newline at end of file
+		function AlreadyInstalled($params)
+		{
+			$object =& $this->getObject($params);
+			/* @var $object kDBList */
+
+			$modules_helper =& $this->Application->recallObject('ModulesHelper');
+			/* @var $modules_helper kModulesHelper */
+
+			return $modules_helper->moduleInstalled( $object->GetDBField('Name') );
+		}
+
+		function ModuleLicensed($params)
+		{
+			$object =& $this->getObject($params);
+			/* @var $object kDBList */
+
+			$modules_helper =& $this->Application->recallObject('ModulesHelper');
+			/* @var $modules_helper kModulesHelper */
+
+			$licensed_modules = array_map('strtolower', $modules_helper->_GetModules());
+
+			return in_array(strtolower($object->GetDBField('Name')), $licensed_modules);
+		}
+
+		function PrerequisitesMet($params)
+		{
+			return !$this->_getPrerequisitesErrors($params);
+		}
+
+		function _getPrerequisitesErrors($params)
+		{
+			static $errors = Array ();
+
+			$object =& $this->getObject($params);
+			/* @var $object kDBList */
+
+			$module_path = strtolower( $object->GetDBField('Name') );
+
+			if (!array_key_exists($module_path, $errors)) {
+				require_once FULL_PATH . '/core/install/install_toolkit.php';
+
+				$toolkit = new kInstallToolkit();
+
+				$module_version = $toolkit->GetMaxModuleVersion($module_path);
+
+				$errors[$module_path] = $toolkit->CheckPrerequisites($module_path . '/', Array ($module_version), 'standalone');
+			}
+
+			return $errors[$module_path];
+		}
+
+		function ListPrerequisites($params)
+		{
+			$errors = $this->_getPrerequisitesErrors($params);
+
+			$ret = '';
+			$block_params = $this->prepareTagParams($params);
+			$block_params['name'] = $params['render_as'];
+
+			foreach ($errors as $error) {
+				$block_params['error'] = $error;
+				$ret .= $this->Application->ParseBlock($block_params);
+			}
+
+			return $ret;
+		}
+
+		function InstallLink($params)
+		{
+			$object =& $this->getObject($params);
+			/* @var $object kDBList */
+
+			$module_path = strtolower( $object->GetDBField('Name') );
+			$url_params = Array ('redirect' => 1, 'admin' => 1);
+
+			return $this->Application->HREF('dummy', '_FRONT_END_', $url_params, $module_path . '/install.php');
+		}
+	}