Add a generator_paths config option

railties/lib/rails/configuration.rb

@@ -22,15 +22,17 @@ module Rails
       end
     end
 
-    attr_reader :middleware
+    attr_reader :middleware, :generator_paths
 
     def initialize(base = nil)
       if base
         @options         = base.options.dup
         @middleware      = base.middleware.dup
+        @generator_paths = base.generator_paths.dup
       else
         @options         = Hash.new { |h,k| h[k] = ActiveSupport::OrderedOptions.new }
         @middleware      = self.class.default_middleware_stack
+        @generator_paths = []
       end
     end
 

railties/test/plugins/configuration_test.rb

@@ -24,6 +24,12 @@ module PluginsTest
       assert_equal "hello", AppTemplate::Application.config.foo.greetings
     end
 
+    test "plugins can provide generators" do
+      class Foo < Rails::Railtie ; config.generator_paths << "/foo" ; end
+      require "#{app_path}/config/application"
+      assert_eqaul ["/foo"], AppTemplate::Application.config.generator_paths
+    end
+
     test "plugin config merges are deep" do
       class Foo < Rails::Railtie ; config.foo.greetings = 'hello' ; end
       class MyApp < Rails::Application