Add AtomWindow.openPath()

src/atom-application.coffee

@@ -230,8 +230,7 @@ class AtomApplication
     existingWindow = @windowForPath(pathToOpen) unless pidToKillWhenClosed
     if existingWindow
       openedWindow = existingWindow
-      openedWindow.focus()
-      openedWindow.sendCommand('window:open-path', pathToOpen)
+      openedWindow.openPath(pathToOpen)
     else
       bootstrapScript = 'window-bootstrap'
       openedWindow = new AtomWindow({pathToOpen, bootstrapScript, @resourcePath})

src/atom-window.coffee

@@ -62,6 +62,10 @@ class AtomWindow
           event.preventDefault()
           @sendCommand 'window:close'
 
+  openPath: (pathToOpen) ->
+    @focus()
+    @sendCommand('window:open-path', pathToOpen)
+
   sendCommand: (command, args...) ->
     ipc.sendChannel @browserWindow.getProcessId(), @browserWindow.getRoutingId(), 'command', command, args...