appenders can be added to multiple categories at the same time

lib/log4js.js

@@ -55,7 +55,7 @@ var log4js = {
 	 * @static
 	 * @final
 	 */
-  	version: "0.1.0",
+  	version: "0.1.1",
 
 	/**  
 	 * Date of logger initialized.
@@ -119,8 +119,21 @@ exports.getDefaultLogger = log4js.getDefaultLogger = function() {
 	return log4js.getLogger(DEFAULT_CATEGORY); 
 };
   
-exports.addAppender = log4js.addAppender = function (appender, categoryName) {
-    var category = categoryName || ALL_CATEGORIES;
+/**
+ * args are appender, then zero or more categories
+ */
+exports.addAppender = log4js.addAppender = function () {
+  var args = Array.prototype.slice.call(arguments);
+  var appender = args.shift();
+  if (args.length == 0) {
+    args = [ ALL_CATEGORIES ];
+  }
+  //argument may already be an array
+  if (args[0].forEach) {
+    args = args[0];
+  }
+  
+  args.forEach(function(category) {
     if (!log4js.appenders[category]) {
       log4js.appenders[category] = [];
     }
@@ -135,13 +148,14 @@ exports.addAppender = log4js.addAppender = function (appender, categoryName) {
     } else if (log4js.loggers[category]) {
       log4js.loggers[category].addListener("log", appender);
     }
+  });
 };
   
 exports.clearAppenders = log4js.clearAppenders = function() {
     log4js.appenders = [];
     for (var logger in log4js.loggers) {
       if (log4js.loggers.hasOwnProperty(logger)) {
-        log4js.loggers[logger].listeners.length = 0;
+        log4js.loggers[logger].removeAllListeners("log");
       }
     }
 };