Refactored AppGenerator and PluginNewGenerator to inherit from AppBase.

railties/lib/rails/generators/app_base.rb

+require 'digest/md5'
+require 'active_support/secure_random'
+require 'rails/version' unless defined?(Rails::VERSION)
+require 'rbconfig'
+require 'open-uri'
+require 'uri'
+
+module Rails
+  module Generators
+    class AppBase < Base
+      def self.say_step(message)
+        @step = (@step || 0) + 1
+        class_eval <<-METHOD, __FILE__, __LINE__ + 1
+          def step_#{@step}
+            #{"puts" if @step > 1}
+            say_status "STEP #{@step}", #{message.inspect}
+          end
+        METHOD
+      end
+
+      def initialize(*args)
+        @original_wd = Dir.pwd
+
+        super
+      end
+
+    protected
+
+      def builder
+        @builder ||= begin
+          if path = options[:builder]
+            if URI(path).is_a?(URI::HTTP)
+              contents = open(path, "Accept" => "application/x-thor-template") {|io| io.read }
+            else
+              contents = open(File.expand_path(path, @original_wd)) {|io| io.read }
+            end
+
+            prok = eval("proc { #{contents} }", TOPLEVEL_BINDING, path, 1)
+            instance_eval(&prok)
+          end
+
+          builder_class = get_builder_class
+          builder_class.send(:include, ActionMethods)
+          builder_class.new(self)
+        end
+      end
+
+      def build(meth, *args)
+        builder.send(meth, *args) if builder.respond_to?(meth)
+      end
+
+      def create_root
+        self.destination_root = File.expand_path(app_path, destination_root)
+        valid_const?
+
+        empty_directory '.'
+        FileUtils.cd(destination_root) unless options[:pretend]
+      end
+    end
+  end
+end

railties/lib/rails/generators/rails/app/app_generator.rb

-require 'digest/md5'
-require 'active_support/secure_random'
-require 'rails/version' unless defined?(Rails::VERSION)
-require 'rbconfig'
-require 'open-uri'
-require 'uri'
+require 'rails/generators/app_base'
 
 module Rails
   module ActionMethods
@@ -158,7 +153,7 @@ module Generators
     RESERVED_NAMES = %w[application destroy benchmarker profiler
                         plugin runner test]
 
-    class AppGenerator < Base
+    class AppGenerator < AppBase
       DATABASES = %w( mysql oracle postgresql sqlite3 frontbase ibm_db )
       JAVASCRIPTS = %w( prototype jquery )
 
@@ -210,8 +205,6 @@ class AppGenerator < Base
       def initialize(*args)
         raise Error, "Options should be given after the application name. For details run: rails --help" if args[0].blank?
 
-        @original_wd = Dir.pwd
-
         super
 
         if !options[:skip_active_record] && !DATABASES.include?(options[:database])
@@ -224,12 +217,8 @@ def initialize(*args)
       end
 
       def create_root
-        self.destination_root = File.expand_path(app_path, destination_root)
-        valid_app_const?
-
-        empty_directory '.'
         set_default_accessors!
-        FileUtils.cd(destination_root) unless options[:pretend]
+        super
       end
 
       def create_root_files
@@ -339,7 +328,7 @@ def builder
             instance_eval(&prok)
           end
 
-          builder_class = defined?(::AppBuilder) ? ::AppBuilder : Rails::AppBuilder
+          builder_class = get_builder_class
           builder_class.send(:include, ActionMethods)
           builder_class.new(self)
         end
@@ -388,7 +377,7 @@ def app_const
         @app_const ||= "#{app_const_base}::Application"
       end
 
-      def valid_app_const?
+      def valid_const?
         if app_const =~ /^\d/
           raise Error, "Invalid application name #{app_name}. Please give a name which does not start with numbers."
         elsif RESERVED_NAMES.include?(app_name)
@@ -442,6 +431,10 @@ def empty_directory_with_gitkeep(destination, config = {})
         empty_directory(destination, config)
         create_file("#{destination}/.gitkeep") unless options[:skip_git]
       end
+
+      def get_builder_class
+        defined?(::AppBuilder) ? ::AppBuilder : Rails::AppBuilder
+      end
     end
   end
 end

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

+require 'rails/generators/app_base'
 require "rails/generators/rails/app/app_generator"
 
 module Rails
@@ -70,12 +71,13 @@ def script
   end
 
   module Generators
-    class PluginNewGenerator < Base
+    class PluginNewGenerator < AppBase
       attr_accessor :rails_template
 
       add_shebang_option!
 
       argument :plugin_path,            :type => :string
+      alias_method :app_path, :plugin_path
 
       class_option :builder,            :type => :string, :aliases => "-b",
                                         :desc => "Path to a plugin builder (can be a filesystem path or URL)"
@@ -89,32 +91,17 @@ class PluginNewGenerator < Base
       class_option :help,               :type => :boolean, :aliases => "-h", :group => :rails,
                                         :desc => "Show this help message and quit"
 
-      def self.say_step(message)
-        @step = (@step || 0) + 1
-        class_eval <<-METHOD, __FILE__, __LINE__ + 1
-          def step_#{@step}
-            #{"puts" if @step > 1}
-            say_status "STEP #{@step}", #{message.inspect}
-          end
-        METHOD
-      end
 
       def initialize(*args)
         raise Error, "Options should be given after plugin name. For details run: rails plugin --help" if args[0].blank?
 
-        @original_wd = Dir.pwd
-
         super
       end
 
       say_step "Creating gem skeleton"
 
       def create_root
-        self.destination_root = File.expand_path(plugin_path, destination_root)
-        valid_plugin_const?
-
-        empty_directory '.'
-        FileUtils.cd(destination_root) unless options[:pretend]
+        super
       end
 
       def create_root_files
@@ -166,29 +153,6 @@ def self.banner
         "rails plugin new #{self.arguments.map(&:usage).join(' ')} [options]"
       end
 
-      def builder
-        @builder ||= begin
-          if path = options[:builder]
-            if URI(path).is_a?(URI::HTTP)
-              contents = open(path, "Accept" => "application/x-thor-template") {|io| io.read }
-            else
-              contents = open(File.expand_path(path, @original_wd)) {|io| io.read }
-            end
-
-            prok = eval("proc { #{contents} }", TOPLEVEL_BINDING, path, 1)
-            instance_eval(&prok)
-          end
-
-          builder_class = defined?(::PluginBuilder) ? ::PluginBuilder : Rails::PluginBuilder
-          builder_class.send(:include, ActionMethods)
-          builder_class.new(self)
-        end
-      end
-
-      def build(meth, *args)
-        builder.send(meth, *args) if builder.respond_to?(meth)
-      end
-
       def name
         @name ||= File.basename(destination_root)
       end
@@ -197,7 +161,7 @@ def camelized
         @camelized ||= name.gsub(/\W/, '_').squeeze('_').camelize
       end
 
-      def valid_plugin_const?
+      def valid_const?
         if camelized =~ /^\d/
           raise Error, "Invalid plugin name #{name}. Please give a name which does not start with numbers."
         elsif RESERVED_NAMES.include?(name)
@@ -220,6 +184,10 @@ def application_definition
         end
       end
       alias :store_application_definition! :application_definition
+
+      def get_builder_class
+        defined?(::PluginBuilder) ? ::PluginBuilder : Rails::PluginBuilder
+      end
     end
   end
 end