Added logging lib with setting to control log level.

lib/logging.js

@@ -0,0 +1,88 @@
+/* jslint moz: true */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+(function(){
+	"use strict";
+	
+	var scope;
+	if ((typeof exports) !== "undefined"){
+		scope = exports;
+	}
+	else if (window.scope){
+		window.scope.logging = {};
+		scope = window.scope.logging;
+	}
+	else {
+		window.logging = {};
+		scope = window.logging;
+	}
+	
+	var prefix = "";
+	
+	function leftPad(str, char, pad){
+		str = "" + str;
+		return char.repeat(pad - str.length) + str;
+	}
+	
+	var queue = [];
+	function performLog(level, args, date){
+		if (!date){
+			date = new Date();
+		}
+		if (settings.isStillDefault){
+			queue.push({level, args, date});
+		}
+		else {
+			if (settings.logLevel >= level){
+				if (prefix){
+					args.unshift(prefix + ":");
+				}
+				args.unshift(
+					"[" +
+					date.getFullYear() + "-" +
+					leftPad(date.getMonth() + 1, "0", 2) + "-" +
+					leftPad(date.getDate(), "0", 2) + " " +
+					leftPad(date.getHours(), "0", 2) + ":" +
+					leftPad(date.getMinutes(), "0", 2) + ":" +
+					leftPad(date.getSeconds(), "0", 2) + "." + 
+					leftPad(date.getMilliseconds(), "0", 3) +
+					"]"
+				);
+				console.log.apply(console, args);
+			}
+		}
+	}
+	
+	function error  (...args){performLog(  1, args);}
+	function warning(...args){performLog( 25, args);}
+	function message(...args){performLog( 50, args);}
+	function notice (...args){performLog( 75, args);}
+	function verbose(...args){performLog(100, args);}
+	function metaLog(...args){performLog(999, args);}
+	
+	scope.setPrefix = function(newPrefix){
+		if (!prefix){
+			prefix = newPrefix;
+		}
+		else {
+			warning("logging prefix already set (%s) cannot be set to %s", prefix, newPrefix);
+		}
+	};
+	scope.clearQueue = function(){
+		if (queue.length){
+			metaLog("clear logging queue");
+			var tmp = queue;
+			queue = [];
+			tmp.forEach(function(item){
+				performLog(item.level, item.args, item.date);
+			});
+			metaLog("logging queue cleared");
+		}
+	};
+	scope.error = error;
+	scope.warning = warning;
+	scope.message = message;
+	scope.notice = notice;
+	scope.verbose = verbose;
+}());