Added 'check for updates' button

* Added 'check for updates' button

* Added GitHub API integration for update checker

* Removed dummy tag for testing

* Changed update dialog text strings

* Added logo to dialogs

app/js/components/mediaPlayer.js

@@ -5,13 +5,17 @@ var Actions           = require('../actions/actionCreators')
 var CurrentTrackStore = require('../stores/currentTrackStore')
 
 var time              = require('../utils/time')
+var github            = require('../utils/github')
 var classNames        = require('classnames')
 var _                 = require('lodash')
 
-var remote            = window.require('remote');
-var Menu              = remote.require('menu');
-var MenuItem          = remote.require('menu-item');
-var pjson             = remote.require('./package.json');
+var remote            = window.require('remote')
+var Menu              = remote.require('menu')
+var MenuItem          = remote.require('menu-item')
+var pjson             = remote.require('./package.json')
+var app               = remote.require('app')
+var dialog            = remote.require('dialog');
+var icon              = remote.nativeImage.createFromPath(app.getAppPath() + '/cumulus.png');
 
 function getStateFromStores() {
   return {
@@ -20,15 +24,14 @@ function getStateFromStores() {
   }
 }
 
-var githubUrl = 'http://github.com/gillesdemey/Cumulus';
-
 var MediaPlayer = React.createClass({
 
   menu: function() {
     var menu = new Menu();
 
     menu.append(new MenuItem({ label : 'Cumulus v' + pjson.version, enabled : false }));
     menu.append(new MenuItem({ label : 'Report a bug...', click : this.report }));
+    menu.append(new MenuItem({ label : 'Check for updates...', click : this.update }));
     menu.append(new MenuItem({ type  : 'separator' }));
     menu.append(new MenuItem({ label : 'About', click : this.about }));
     menu.append(new MenuItem({ type  : 'separator' }));
@@ -122,11 +125,36 @@ var MediaPlayer = React.createClass({
   },
 
   about: function() {
-    this.openExternal(githubUrl);
+    this.openExternal(github.getRepoUrl());
   },
 
   report: function() {
-    this.openExternal(githubUrl + '/issues');
+    this.openExternal(github.getRepoUrl() + '/issues');
+  },
+
+  update: function() {
+    github.checkForUpdates().then(function(upToDateMessage) {
+      // cumulus is up-to-date
+      var options = {
+        icon: icon,
+        message: upToDateMessage,
+        buttons: ["OK"]
+      }
+
+      dialog.showMessageBox(options);
+    }, function(outdatedMessage) {
+      var options = {
+        icon: icon,
+        message: outdatedMessage,
+        buttons: ["Download latest version", "Cancel"]
+      }
+
+      dialog.showMessageBox(options, function(buttonId) {
+        if(buttonId === 0) {
+          remote.require('shell').openExternal(github.getRepoUrl() + '/releases/latest')
+        }
+      })
+    })
   },
 
   openPermalink: function() {

app/js/utils/github.js

@@ -0,0 +1,43 @@
+'use strict';
+
+var remote            = window.require('remote');
+var pjson             = remote.require('./package.json');
+var rp                = window.require('request-promise')
+var _                 = require('lodash')
+
+var GitHub = function(options) {
+  this._repo       = 'http://github.com/gillesdemey/Cumulus'
+  this._endpoint   = 'https://api.github.com/repos/gillesdemey/cumulus'
+}
+
+GitHub.prototype.getRepoUrl = function() {
+  return this._repo;
+}
+
+GitHub.prototype.checkForUpdates = function() {
+  return this.getLatestRelease().then(function(response) {
+    var tag = response.tag_name.replace(/v/g, '')
+
+    if(pjson.version == tag) {
+      return Promise.resolve('Cumulus is currently up-to-date.')
+    } else {
+      return Promise.reject('A new version of Cumulus is available.')
+    }
+  }, function(error) {
+    return Promise.reject('Cumulus was not able to check version information.');
+  })
+}
+
+GitHub.prototype.getLatestRelease = function() {
+  var options = {
+    uri: this._endpoint + '/releases/latest',
+    json: true,
+    headers: {
+      'User-Agent': 'gillesdemey/Cumulus'
+    },
+  }
+
+  return rp(options);
+}
+
+module.exports = new GitHub();