make custom titlebar user-configurable and prompt for relaunch on change

src/atom-environment.coffee

@@ -196,7 +196,6 @@ class AtomEnvironment extends Model
       notificationManager: @notifications, @applicationDelegate, @clipboard, viewRegistry: @views, assert: @assert.bind(this)
     })
 
-    @titleBar = new TitleBar() if process.platform is 'darwin'
     @themes.workspace = @workspace
 
     @textEditors = new TextEditorRegistry
@@ -204,6 +203,9 @@ class AtomEnvironment extends Model
 
     @config.load()
 
+    # This needs to happen after config.load()
+    @titleBar = new TitleBar() if process.platform is 'darwin' and @config.get('core.useCustomTitleBar')
+
     @themes.loadBaseStylesheets()
     @initialStyleElements = @styles.getSnapshot()
     @themes.initialLoadComplete = true if onlyLoadBaseStyleSheets

src/config-schema.coffee

@@ -266,3 +266,9 @@ if process.platform in ['win32', 'linux']
     type: 'boolean'
     default: false
     description: 'Automatically hide the menu bar and toggle it by pressing Alt. This is only supported on Windows & Linux.'
+
+if process.platform is 'darwin'
+  module.exports.core.properties.useCustomTitleBar =
+    type: 'boolean'
+    default: false
+    description: 'Use custom, theme-aware title-bar.<br />Note: This currently does not include a file icon or title context menu.<br />This setting will require a relaunch of Atom to take effect.'

src/main-process/atom-application.coffee

@@ -76,6 +76,8 @@ class AtomApplication
     @config.setSchema null, {type: 'object', properties: _.clone(require('../config-schema'))}
     @config.load()
 
+    @config.onDidChange 'core.useCustomTitleBar', @promptForRelaunch
+
     @autoUpdateManager = new AutoUpdateManager(@version, options.test, @resourcePath, @config)
     @applicationMenu = new ApplicationMenu(@version, @autoUpdateManager)
     @atomProtocolHandler = new AtomProtocolHandler(@resourcePath, @safeMode)
@@ -87,6 +89,7 @@ class AtomApplication
     @setupDockMenu()
     @storageFolder = new StorageFolder(process.env.ATOM_HOME)
 
+
     if options.pathsToOpen?.length > 0 or options.urlsToOpen?.length > 0 or options.test
       @openWithOptions(options)
     else
@@ -706,3 +709,16 @@ class AtomApplication
       openOptions.defaultPath = path
 
     dialog.showOpenDialog(parentWindow, openOptions, callback)
+
+  promptForRelaunch: ->
+    chosen = dialog.showMessageBox BrowserWindow.getFocusedWindow(),
+      type: 'warning'
+      title: 'Relaunch required'
+      message: "To apply this setting, you'll need to relaunch Atom."
+      detail: ''
+      buttons: ['Relaunch Atom', 'Cancel']
+    if chosen is 0
+      # once we're using electron v.1.2.2
+      # app.relaunch()
+      app.quit()
+

src/main-process/atom-window.coffee

@@ -40,7 +40,7 @@ class AtomWindow
     if process.platform is 'linux'
       options.icon = @constructor.iconPath
 
-    if process.platform is 'darwin'
+    if process.platform is 'darwin' and global.atomApplication.config.get('core.useCustomTitleBar')
       options.titleBarStyle = 'hidden'
 
     @browserWindow = new BrowserWindow options