Support scoped settings in getDefault

spec/config-spec.coffee

@@ -88,6 +88,19 @@ describe "Config", ->
       expect(atom.config.getDefault('foo.bar')).toEqual initialDefaultValue
       expect(atom.config.getDefault('foo.bar')).not.toBe initialDefaultValue
 
+    describe "when scoped settings are used", ->
+      it "returns the global default when no scoped default set", ->
+        atom.config.setDefaults("foo", bar: baz: 10)
+        expect(atom.config.getDefault('.source.coffee', 'foo.bar.baz')).toBe 10
+
+      it "returns the scoped default when a scoped default is set", ->
+        atom.config.setDefaults("foo", bar: baz: 10)
+        atom.config.addScopedSettings("default", ".source.coffee", foo: bar: baz: 42)
+        expect(atom.config.getDefault('.source.coffee', 'foo.bar.baz')).toBe 42
+
+        atom.config.set('.source.coffee', 'foo.bar.baz', 55)
+        expect(atom.config.getDefault('.source.coffee', 'foo.bar.baz')).toBe 42
+
   describe ".isDefault(keyPath)", ->
     it "returns true when the value of the key path is its default value", ->
       atom.config.setDefaults("foo", same: 1, changes: 1)

src/config.coffee

@@ -530,8 +530,16 @@ class Config
   # * `keyPath` The {String} name of the key.
   #
   # Returns the default value.
-  getDefault: (keyPath) ->
-    defaultValue = _.valueForKeyPath(@defaultSettings, keyPath)
+  getDefault: (scopeSelector, keyPath) ->
+    if arguments.length == 1
+      keyPath = scopeSelector
+      scopeSelector = null
+
+    if scopeSelector?
+      defaultValue = @scopedSettingsStore.getPropertyValue(scopeSelector, keyPath, excludeSources: ['user-config'])
+      defaultValue ?= _.valueForKeyPath(@defaultSettings, keyPath)
+    else
+      defaultValue = _.valueForKeyPath(@defaultSettings, keyPath)
     _.deepClone(defaultValue)
 
   # Extended: Is the value at `keyPath` its default value?