closes #1595

public/language/en_GB/global.json

@@ -90,5 +90,8 @@
 	"language": "Language",
 
 	"guest": "Guest",
-	"guests": "Guests"
+	"guests": "Guests",
+
+	"updated:title": "Forum Updated",
+	"updated:message": "This forum has just been updated to the latest version. Click here to refresh the page."
 }

public/src/app.js

@@ -8,7 +8,8 @@ var socket,
 		'uid': null,
 		'isFocused': true,
 		'currentRoom': null,
-		'widgets': {}
+		'widgets': {},
+		'cacheBuster': null
 	};
 
 (function () {
@@ -51,7 +52,21 @@ var socket,
 
 			app.enterRoom(room, true);
 
-			socket.emit('meta.reconnected');
+			socket.emit('meta.reconnected', {}, function(err, cacheBuster) {
+				if (app.cacheBuster !== cacheBuster) {
+					app.cacheBuster = cacheBuster;
+
+					app.alert({
+						title: '[[global.updated:title]]',
+						message: '[[global.updated:message]]',
+						clickfn: function() {
+							window.location.reload();
+						},
+						type: 'warning'
+					});
+				}
+			});
+			
 			$(window).trigger('action:reconnected');
 
 			setTimeout(function() {
@@ -147,6 +162,8 @@ var socket,
 					socket.emit('tools.log', arguments);
 				};
 			}
+			
+			app.cacheBuster = config['cache-buster'];
 		}
 	}
 

src/meta.js

@@ -16,7 +16,8 @@ var fs = require('fs'),
 	db = require('./database'),
 	plugins = require('./plugins'),
 	user = require('./user'),
-	groups = require('./groups');
+	groups = require('./groups'),
+	emitter = require('./emitter');
 
 (function (Meta) {
 	Meta.restartRequired = false;
@@ -326,6 +327,8 @@ var fs = require('fs'),
 					Meta.js.cache = payload.data.js;
 					Meta.js.map = payload.data.map;
 					minifier.kill();
+
+					emitter.emit('meta:js.compiled');
 				} else {
 					winston.error('[meta/js] Could not compile client-side scripts!');
 					winston.error('[meta/js]   ' + payload.error.message);
@@ -410,6 +413,7 @@ var fs = require('fs'),
 				Meta.css.updateBranding();
 
 				winston.info('[meta/css] Done.');
+				emitter.emit('meta:css.compiled');
 			});
 		});
 	};

src/socket.io/meta.js

@@ -3,6 +3,7 @@ var	meta = require('../meta'),
 	topics = require('../topics'),
 	logger = require('../logger'),
 	plugins = require('../plugins'),
+	emitter = require('../emitter'),
 
 	nconf = require('nconf'),
 	gravatar = require('gravatar'),
@@ -13,7 +14,7 @@ var	meta = require('../meta'),
 		rooms: {}
 	};
 
-SocketMeta.reconnected = function(socket) {
+SocketMeta.reconnected = function(socket, data, callback) {
 	var	uid = socket.uid,
 		sessionID = socket.id;
 
@@ -22,6 +23,12 @@ SocketMeta.reconnected = function(socket) {
 		user.notifications.pushCount(uid);
 	}
 
+	if (typeof callback === 'function') {
+		emitter.on('nodebb:ready', function() {
+			callback(null, meta.config['cache-buster']);
+		});
+	}
+
 	if (process.env.NODE_ENV === 'development') {
 		if (uid) {
 			winston.info('[socket] uid ' + uid + ' (' + sessionID + ') has successfully reconnected.');