Move singleton pattern to Railtie and remove Engine::Configurable and Application::Configurable in favor of unified Railtie::Configurable

railties/lib/rails/application.rb

@@ -41,20 +41,6 @@ module Rails
     autoload :Railties,       'rails/application/railties'
 
     class << self
-      private :new
-
-      def instance
-        if self == Rails::Application
-          if Rails.application
-            ActiveSupport::Deprecation.warn "Calling a method in Rails::Application is deprecated, " <<
-              "please call it directly in your application constant #{Rails.application.class.name}.", caller
-          end
-          Rails.application
-        else
-          @@instance ||= new
-        end
-      end
-
       def inherited(base)
         raise "You cannot have more than one Rails::Application" if Rails.application
         super
@@ -62,15 +48,8 @@ module Rails
         Rails.application.add_lib_to_load_path!
         ActiveSupport.run_load_hooks(:before_configuration, base.instance)
       end
-
-      def respond_to?(*args)
-        super || instance.respond_to?(*args)
-      end
-
     end
 
-    delegate :middleware, :to => :config
-
     # This method is called just after an application inherits from Rails::Application,
     # allowing the developer to load classes in lib and use them during application
     # configuration.
@@ -99,10 +78,6 @@ module Rails
       super
     end
 
-    def railties
-      @railties ||= Railties.new(config)
-    end
-
     def routes_reloader
       @routes_reloader ||= ActiveSupport::FileUpdateChecker.new([]){ reload_routes! }
     end
@@ -163,6 +138,10 @@ module Rails
       initializers
     end
 
+    def config
+      @config ||= Application::Configuration.new(find_root_with_flag("config.ru", Dir.pwd))
+    end
+
   protected
 
     def default_middleware_stack

railties/lib/rails/application/configurable.rb

@@ -1,19 +0,0 @@
-module Rails
-  class Application
-    module Configurable
-      def self.included(base)
-        base.extend ClassMethods
-      end
-
-      module ClassMethods
-        def inherited(base)
-          raise "You cannot inherit from a Rails::Application child"
-        end
-      end
-
-      def config
-        @config ||= Application::Configuration.new(self.class.find_root_with_flag("config.ru", Dir.pwd))
-      end
-    end
-  end
-end

railties/lib/rails/application/railties.rb

@@ -10,7 +10,7 @@ module Rails
       end
 
       def railties
-        @railties ||= ::Rails::Railtie.subclasses.map(&:new)
+        @railties ||= ::Rails::Railtie.subclasses.map(&:instance)
       end
 
       def engines

railties/lib/rails/engine.rb

@@ -125,19 +125,9 @@ module Rails
         @endpoint = endpoint if endpoint
         @endpoint
       end
-
-      def configure(&block)
-        class_eval(&block)
-      end
-
-    protected
-
-      def method_missing(*args, &block)
-        instance.send(*args, &block)
-      end
     end
 
-    delegate :paths, :root, :to => :config
+    delegate :middleware, :root, :paths, :to => :config
 
     def load_tasks
       super
@@ -154,7 +144,7 @@ module Rails
     end
 
     def railties
-      @railties ||= Railties.new(config)
+      @railties ||= self.class::Railties.new(config)
     end
 
     def app
@@ -183,6 +173,10 @@ module Rails
       initializers
     end
 
+    def config
+      @config ||= Engine::Configuration.new(find_root_with_flag("lib"))
+    end
+
     # Add configured load paths to ruby load paths and remove duplicates.
     initializer :set_load_path, :before => :bootstrap_hook do
       _all_load_paths.reverse_each do |path|
@@ -256,6 +250,21 @@ module Rails
     end
 
   protected
+    def find_root_with_flag(flag, default=nil)
+      root_path = self.class.called_from
+
+      while root_path && File.directory?(root_path) && !File.exist?("#{root_path}/#{flag}")
+        parent = File.dirname(root_path)
+        root_path = parent != root_path && parent
+      end
+
+      root = File.exist?("#{root_path}/#{flag}") ? root_path : default
+      raise "Could not find root path for #{self}" unless root
+
+      Config::CONFIG['host_os'] =~ /mswin|mingw/ ?
+        Pathname.new(root).expand_path : Pathname.new(root).realpath
+    end
+
     def default_middleware_stack
       ActionDispatch::MiddlewareStack.new
     end

railties/lib/rails/engine/configurable.rb

@@ -1,31 +0,0 @@
-module Rails
-  class Engine
-    module Configurable
-      def self.included(base)
-        base.extend ClassMethods
-        base.private_class_method :new
-      end
-
-      module ClassMethods
-        delegate :middleware, :root, :paths, :to => :config
-        delegate :call, :to => :instance
-
-        def config
-          @config ||= Engine::Configuration.new(find_root_with_flag("lib"))
-        end
-
-        def inherited(base)
-          raise "You cannot inherit from a Rails::Engine child"
-        end
-
-        def instance
-          @instance ||= new
-        end
-      end
-
-      def config
-        self.class.config
-      end
-    end
-  end
-end

railties/lib/rails/railtie.rb

@@ -130,13 +130,15 @@ module Rails
     ABSTRACT_RAILTIES = %w(Rails::Railtie Rails::Plugin Rails::Engine Rails::Application)
 
     class << self
+      private :new
+
       def subclasses
         @subclasses ||= []
       end
 
       def inherited(base)
         unless base.abstract_railtie?
-          base.send(:include, self::Configurable)
+          base.send(:include, Railtie::Configurable)
           subclasses << base
         end
       end
@@ -164,6 +166,10 @@ module Rails
       end
     end
 
+    def config
+      @config ||= Railtie::Configuration.new
+    end
+
     def eager_load!
     end
 

railties/lib/rails/railtie/configurable.rb

@@ -6,17 +6,29 @@ module Rails
       end
 
       module ClassMethods
-        def config
-          @config ||= Railtie::Configuration.new
-        end
+        delegate :config, :to => :instance
 
         def inherited(base)
-          raise "You cannot inherit from a Rails::Railtie child"
+          raise "You cannot inherit from a #{self.superclass.name} child"
         end
-      end
 
-      def config
-        self.class.config
+        def instance
+          @instance ||= new
+        end
+
+        def respond_to?(*args)
+          super || instance.respond_to?(*args)
+        end
+
+        def configure(&block)
+          class_eval(&block)
+        end
+
+        protected
+
+          def method_missing(*args, &block)
+            instance.send(*args, &block)
+          end
       end
     end
   end

railties/test/application/configuration_test.rb

@@ -26,18 +26,17 @@ module ApplicationTests
       FileUtils.rm_rf(new_app) if File.directory?(new_app)
     end
 
-    test "Rails::Application.instance is nil until app is initialized" do
+    test "Rails.application is nil until app is initialized" do
       require 'rails'
-      assert_nil Rails::Application.instance
+      assert_nil Rails.application
       require "#{app_path}/config/environment"
-      assert_equal AppTemplate::Application.instance, Rails::Application.instance
+      assert_equal AppTemplate::Application.instance, Rails.application
     end
 
-    test "Rails::Application responds to all instance methods" do
+    test "Rails.application responds to all instance methods" do
       require "#{app_path}/config/environment"
-      assert_respond_to Rails::Application, :routes_reloader
-      assert_equal Rails::Application.routes_reloader, Rails.application.routes_reloader
-      assert_equal Rails::Application.routes_reloader, AppTemplate::Application.routes_reloader
+      assert_respond_to Rails.application, :routes_reloader
+      assert_equal Rails.application.routes_reloader, AppTemplate::Application.routes_reloader
     end
 
     test "Rails::Application responds to paths" do

railties/test/railties/engine_test.rb

@@ -85,12 +85,12 @@ module RailtiesTest
 
       boot_rails
 
-      Rails::Application.routes.draw do |map|
+      Rails.application.routes.draw do |map|
         mount(Bukkits::Engine => "/bukkits")
       end
 
       env = Rack::MockRequest.env_for("/bukkits")
-      response = Rails::Application.call(env)
+      response = Rails.application.call(env)
 
       assert_equal "HELLO WORLD", response[2]
     end
@@ -109,12 +109,12 @@ module RailtiesTest
         match "/foo" => lambda { |env| [200, {'Content-Type' => 'text/html'}, 'foo'] }
       end
 
-      Rails::Application.routes.draw do |map|
+      Rails.application.routes.draw do |map|
         mount(Bukkits::Engine => "/bukkits")
       end
 
       env = Rack::MockRequest.env_for("/bukkits/foo")
-      response = Rails::Application.call(env)
+      response = Rails.application.call(env)
 
       assert_equal "foo", response[2]
     end