Lazy load any new style appenders

lib/appenders/hookio.js

@@ -43,6 +43,7 @@ function createAppender(hookioOptions, actualAppender) {
 function configure(config) {
   var actualAppender;
   if (config.appender && config.mode === 'master') {
+    log4js.loadAppender(config.appender.type);
     actualAppender = log4js.appenderMakers[config.appender.type](config.appender);
   }
   delete config.appender;

lib/log4js.js

@@ -136,6 +136,7 @@ function configureAppenders(appenderList) {
     clearAppenders();
     if (appenderList) {
         appenderList.forEach(function(appenderConfig) {
+            loadAppender(appenderConfig.type);
             var appender;
             appenderConfig.makers = appenderMakers;
             appender = appenderMakers[appenderConfig.type](appenderConfig);
@@ -347,15 +348,10 @@ function replaceConsole(logger) {
     });
 }
 
-function loadAppenders() {
-    var appenderList = fs.readdirSync(__dirname + '/appenders');
-    appenderList.forEach(function(file) {
-        if (/\.js$/.test(file)) {
-            var appenderModule = require('./appenders/' + file);
-            module.exports.appenders[appenderModule.name] = appenderModule.appender;
-            appenderMakers[appenderModule.name] = appenderModule.configure;
-        }
-    });
+function loadAppender(appender) {
+    var appenderModule = require('./appenders/' + appender);
+    module.exports.appenders[appenderModule.name] = appenderModule.appender;
+    appenderMakers[appenderModule.name] = appenderModule.configure;
 }
 
 module.exports = {
@@ -363,6 +359,7 @@ module.exports = {
     getDefaultLogger: getDefaultLogger,
 
     addAppender: addAppender,
+    loadAppender: loadAppender,
     clearAppenders: clearAppenders,
     configure: configure,
 
@@ -375,7 +372,11 @@ module.exports = {
     connectLogger: require('./connect-logger').connectLogger
 };
 
-loadAppenders();
+//load the old-style appenders
+[ 'console', 'file', 'logLevelFilter' ].forEach(function(appender) {
+   loadAppender(appender);
+});
+
 //set ourselves up if we can find a default log4js.json
 configure(findConfiguration());
 //replace console.log, etc with log4js versions