Title-notification: Use ES2015 & fix linting

Author: Mottie

github-title-notification.user.js

@@ -1,9 +1,9 @@
 // ==UserScript==
 // @name          GitHub Title Notification
-// @version       1.0.1
+// @version       1.0.2
 // @description   A userscript that changes the document title if there are unread messages
 // @license       https://creativecommons.org/licenses/by-sa/4.0/
-// @namespace     http://github.com/Mottie
+// @namespace     https://github.com/Mottie
 // @include       https://github.com/*
 // @run-at        document-idle
 // @grant         GM_registerMenuCommand
@@ -13,8 +13,7 @@
 // @updateURL     https://raw.githubusercontent.com/Mottie/Github-userscripts/master/github-title-notification.user.js
 // @downloadURL   https://raw.githubusercontent.com/Mottie/Github-userscripts/master/github-title-notification.user.js
 // ==/UserScript==
-/* jshint unused:true, esnext:true */
-(function() {
+(() => {
 	"use strict";
 
 	let timer,
@@ -23,40 +22,34 @@
 		// check every 30 seconds
 		interval = GM_getValue("interval", 30);
 
-	function hasClass(el, name) {
-		if (el) {
-			return el.classList ? el.classList.contains(name) : new RegExp("\\b" + name + "\\b").test(el.className);
-		}
-		return false;
-	}
-
 	function check() {
 		let title = document.title,
-			hasUnread = hasClass(document.querySelector(".mail-status"), "unread");
+			mail = document.querySelector(".mail-status"),
+			hasUnread = mail ? mail.classList.contains("unread") : false;
 		//
 		if (!/^\(\d+\)/.test(title)) {
-			title = title.replace(/^\([^)]+\)\s/, "");
+			title = title.replace(/^(\([^)]+\)\s)*/g, "");
 		}
 		document.title = hasUnread ? "(" + indicator + ") " + title : title;
 	}
 
 	function setTimer() {
 		clearInterval(timer);
 		if (document.querySelector(".mail-status")) {
-			timer = setInterval(function() {
+			timer = setInterval(() => {
 				check();
 			}, interval * 1000);
 			check();
 		}
 	}
 
 	// Add GM options
-	GM_registerMenuCommand("Set GitHub Title Notification Indicator", function() {
+	GM_registerMenuCommand("Set GitHub Title Notification Indicator", () => {
 		indicator = prompt("Indicator Value (it will be wrapped in parentheses)?", indicator);
 		GM_setValue("indicator", indicator);
 		check();
 	});
-	GM_registerMenuCommand("Set GitHub Title Notification Interval", function() {
+	GM_registerMenuCommand("Set GitHub Title Notification Interval", () => {
 		interval = prompt("Interval Value (in seconds)?", interval);
 		GM_setValue("interval", interval);
 		setTimer();