added 'array' type for config manager

This allows to use simple arrays in the config file but have a comma
separated list in the config manager.

lib/plugins/config/settings/config.class.php

@@ -435,6 +435,110 @@ if (!class_exists('setting')) {
   }
 }
 
+
+if (!class_exists('setting_array')) {
+    class setting_array extends setting {
+
+        /**
+         * Create an array from a string
+         *
+         * @param $string
+         * @return array
+         */
+        protected function _from_string($string){
+            $array = explode(',', $string);
+            $array = array_map('trim', $array);
+            $array = array_filter($array);
+            $array = array_unique($array);
+            return $array;
+        }
+
+        /**
+         * Create a string from an array
+         *
+         * @param $array
+         * @return string
+         */
+        protected function _from_array($array){
+            return join(', ', (array) $array);
+        }
+
+        /**
+         * update setting with user provided value $input
+         * if value fails error check, save it
+         *
+         * @param string $input
+         * @return bool true if changed, false otherwise (incl. on error)
+         */
+        function update($input) {
+            if (is_null($input)) return false;
+            if ($this->is_protected()) return false;
+
+            $input = $this->_from_string($input);
+
+            $value = is_null($this->_local) ? $this->_default : $this->_local;
+            if ($value == $input) return false;
+
+            foreach($input as $item){
+                if ($this->_pattern && !preg_match($this->_pattern,$item)) {
+                    $this->_error = true;
+                    $this->_input = $input;
+                    return false;
+                }
+            }
+
+            $this->_local = $input;
+            return true;
+        }
+
+        protected function _escape($string) {
+            $tr = array("\\" => '\\\\', "'" => '\\\'');
+            return "'".strtr( cleanText($string), $tr)."'";
+        }
+
+        /**
+         * generate string to save setting value to file according to $fmt
+         */
+        function out($var, $fmt='php') {
+
+            if ($this->is_protected()) return '';
+            if (is_null($this->_local) || ($this->_default == $this->_local)) return '';
+
+            $out = '';
+
+            if ($fmt=='php') {
+                $vals = array_map(array($this, '_escape'), $this->_local);
+                $out =  '$'.$var."['".$this->_out_key()."'] = array(".join(', ',$vals).");\n";
+            }
+
+            return $out;
+        }
+
+        function html(&$plugin, $echo=false) {
+            $value = '';
+            $disable = '';
+
+            if ($this->is_protected()) {
+                $value = $this->_protected;
+                $disable = 'disabled="disabled"';
+            } else {
+                if ($echo && $this->_error) {
+                    $value = $this->_input;
+                } else {
+                    $value = is_null($this->_local) ? $this->_default : $this->_local;
+                }
+            }
+
+            $key = htmlspecialchars($this->_key);
+            $value = htmlspecialchars($this->_from_array($value));
+
+            $label = '<label for="config___'.$key.'">'.$this->prompt($plugin).'</label>';
+            $input = '<input id="config___'.$key.'" name="config['.$key.']" type="text" class="edit" value="'.$value.'" '.$disable.'/>';
+            return array($label,$input);
+        }
+    }
+}
+
 if (!class_exists('setting_string')) {
   class setting_string extends setting {
     function html(&$plugin, $echo=false) {

lib/plugins/config/settings/config.metadata.php

@@ -32,6 +32,9 @@
  *                    separated list of checked choices
  *   'fieldset'     - used to group configuration settings, but is not itself a setting. To make this clear in
  *                    the language files the keys for this type should start with '_'.
+ *   'array'        - a simple (one dimensional) array of string values, shown as comma separated list in the
+ *                    config manager but saved as PHP array(). Values may not contain commas themselves.
+ *                    _pattern matching on the array values supported.
  *
  *  Single Setting (source: settings/extra.class.php)
  *  -------------------------------------------------