Allow multiple commands to be registered by passing an object

spec/command-registry-spec.coffee

@@ -92,3 +92,21 @@ describe "CommandRegistry", ->
     disposable2.dispose()
     grandchild.dispatchEvent(new CustomEvent('command', bubbles: true))
     expect(calls).toEqual []
+
+  it "allows multiple commands to be registered under one selector when called with an object", ->
+    calls = []
+
+    disposable = registry.add '.child',
+      'command-1': -> calls.push('command-1')
+      'command-2': -> calls.push('command-2')
+
+    grandchild.dispatchEvent(new CustomEvent('command-1', bubbles: true))
+    grandchild.dispatchEvent(new CustomEvent('command-2', bubbles: true))
+
+    expect(calls).toEqual ['command-1', 'command-2']
+
+    calls = []
+    disposable.dispose()
+    grandchild.dispatchEvent(new CustomEvent('command-1', bubbles: true))
+    grandchild.dispatchEvent(new CustomEvent('command-2', bubbles: true))
+    expect(calls).toEqual []

src/command-registry.coffee

@@ -1,4 +1,4 @@
-{Disposable} = require 'event-kit'
+{Disposable, CompositeDisposable} = require 'event-kit'
 {specificity} = require 'clear-cut'
 
 SequenceCount = 0
@@ -10,6 +10,13 @@ class CommandRegistry
     @listenersByCommandName = {}
 
   add: (selector, commandName, callback) ->
+    if typeof commandName is 'object'
+      commands = commandName
+      disposable = new CompositeDisposable
+      for commandName, callback of commands
+        disposable.add @add(selector, commandName, callback)
+      return disposable
+
     unless @listenersByCommandName[commandName]?
       @rootNode.addEventListener(commandName, @dispatchCommand, true)
       @listenersByCommandName[commandName] = []