Add standard debug conditional function

: master

lib/streams/BaseRollingFileStream.js

@@ -2,8 +2,11 @@ var fs = require('fs'),
 stream = require('stream'),
 util = require('util');
 
-function debug(message) {
-//    console.log(message);
+var debug;
+if (process.env.NODE_DEBUG && /\blog4js\b/.test(process.env.NODE_DEBUG)) {
+    debug = function(message) { console.error('LOG4JS: (BaseRollingFileStream) %s', message); };
+} else {
+    debug = function() { };
 }
 
 module.exports = BaseRollingFileStream;

lib/streams/DateRollingFileStream.js

@@ -6,8 +6,11 @@ var BaseRollingFileStream = require('./BaseRollingFileStream'),
 
 module.exports = DateRollingFileStream;
 
-function debug(message) {
-//    console.log(message);
+var debug;
+if (process.env.NODE_DEBUG && /\blog4js\b/.test(process.env.NODE_DEBUG)) {
+    debug = function(message) { console.error('LOG4JS: (DateRollingFileStream) %s', message); };
+} else {
+    debug = function() { };
 }
 
 function DateRollingFileStream(filename, pattern, options, now) {

lib/streams/RollingFileStream.js

@@ -4,9 +4,11 @@ var BaseRollingFileStream = require('./BaseRollingFileStream'),
     fs = require('fs'),
     async = require('async');
 
-function debug() {
-//    util.debug(message);
-//  console.log.apply(console, arguments);
+var debug;
+if (process.env.NODE_DEBUG && /\blog4js\b/.test(process.env.NODE_DEBUG)) {
+    debug = function(message) { console.error('LOG4JS: (RollingFileStream) %s', message); };
+} else {
+    debug = function() { };
 }
 
 module.exports = RollingFileStream;