extensibility via services

lib/command.coffee

@@ -13,7 +13,7 @@ class Command
     return unless input.characters.length > 0
     [command, args...] = input.characters.split(" ")
 
-    func = (new Ex)[command]
+    func = Ex.singleton()[command]
     if func?
       func(args...)
     else

lib/ex-mode.coffee

@@ -1,5 +1,6 @@
 GlobalExState = require './global-ex-state'
 ExState = require './ex-state'
+Ex = require './ex'
 {Disposable, CompositeDisposable} = require 'event-kit'
 
 module.exports = ExMode =
@@ -26,3 +27,6 @@ module.exports = ExMode =
 
   deactivate: ->
     @disposables.dispose()
+
+  provideEx: ->
+    registerCommand: Ex.registerCommand.bind(Ex)

lib/ex.coffee

@@ -1,6 +1,12 @@
 path = require 'path'
 
 class Ex
+  @singleton: =>
+    @ex ||= new Ex
+
+  @registerCommand: (name, func) =>
+    @singleton()[name] = func
+
   quit: ->
     atom.workspace.getActivePane().destroyActiveItem()