Handle double-click on custom title bar

src/application-delegate.coffee

@@ -1,5 +1,5 @@
 _ = require 'underscore-plus'
-{screen, ipcRenderer, remote, shell, webFrame} = require 'electron'
+{screen, ipcRenderer, remote, shell, systemPreferences, webFrame} = require 'electron'
 ipcHelpers = require './ipc-helpers'
 {Disposable} = require 'event-kit'
 {getWindowLoadSettings, setWindowLoadSettings} = require './window-load-settings-helpers'
@@ -57,12 +57,18 @@ class ApplicationDelegate
   reloadWindow: ->
     ipcRenderer.send("call-window-method", "reload")
 
+  minimizeWindow: ->
+    ipcRenderer.send("call-window-method", "minimize")
+
   isWindowMaximized: ->
     remote.getCurrentWindow().isMaximized()
 
   maximizeWindow: ->
     ipcRenderer.send("call-window-method", "maximize")
 
+  unmaximizeWindow: ->
+    ipcRenderer.send("call-window-method", "unmaximize")
+
   isWindowFullScreen: ->
     remote.getCurrentWindow().isFullScreen()
 
@@ -130,6 +136,9 @@ class ApplicationDelegate
   getPrimaryDisplayWorkAreaSize: ->
     remote.screen.getPrimaryDisplay().workAreaSize
 
+  getAppleActionOnDoubleClick: ->
+    remote.systemPreferences.getUserDefault("AppleActionOnDoubleClick", "string")
+
   confirm: ({message, detailedMessage, buttons}) ->
     buttons ?= {}
     if _.isArray(buttons)

src/title-bar.coffee

@@ -8,12 +8,24 @@ class TitleBar
     @titleElement.classList.add('title')
     @element.appendChild(@titleElement)
 
+    @element.addEventListener 'dblclick', @dblclickHandler
+
     @workspace.onDidChangeActivePaneItem => @updateTitle()
     @themes.onDidChangeActiveThemes => @updateWindowSheetOffset()
 
     @updateTitle()
     @updateWindowSheetOffset()
 
+  dblclickHandler: =>
+    switch @applicationDelegate.getAppleActionOnDoubleClick()
+      when 'Minimize'
+        @applicationDelegate.minimizeWindow()
+      when 'Maximize'
+        if @applicationDelegate.isWindowMaximized()
+          @applicationDelegate.unmaximizeWindow()
+        else
+          @applicationDelegate.maximizeWindow()
+
   updateTitle: ->
     @titleElement.textContent = document.title