Add Config::getDefault(keyPath)

spec/config-spec.coffee

@@ -45,6 +45,23 @@ describe "Config", ->
         atom.config.set('foo.changes', 1)
         expect(atom.config.settings.foo).toEqual {}
 
+  describe ".getDefault(keyPath)", ->
+    it "returns the default value", ->
+      atom.config.setDefaults("foo", same: 1, changes: 1)
+      expect(atom.config.getDefault('foo.same')).toBe 1
+      expect(atom.config.getDefault('foo.changes')).toBe 1
+
+      atom.config.set('foo.same', 2)
+      atom.config.set('foo.changes', 3)
+      expect(atom.config.getDefault('foo.same')).toBe 1
+      expect(atom.config.getDefault('foo.changes')).toBe 1
+
+    it "returns a clone of the default value", ->
+      initialDefaultValue = [1, 2, 3]
+      atom.config.setDefaults("foo", bar: initialDefaultValue)
+      expect(atom.config.getDefault('foo.bar')).toEqual initialDefaultValue
+      expect(atom.config.getDefault('foo.bar')).not.toBe initialDefaultValue
+
   describe ".toggle(keyPath)", ->
     it "negates the boolean value of the current key path value", ->
       atom.config.set('foo.a', 1)

src/config.coffee

@@ -158,6 +158,15 @@ class Config
   restoreDefault: (keyPath) ->
     @set(keyPath, _.valueForKeyPath(@defaultSettings, keyPath))
 
+  # Public: Get the default value of the key path.
+  #
+  # keyPath - The {String} name of the key.
+  #
+  # Returns the default value.
+  getDefault: (keyPath) ->
+    value = _.valueForKeyPath(@defaultSettings, keyPath)
+    _.deepClone(value)
+
   # Public: Push the value to the array at the key path.
   #
   # keyPath - The {String} key path.