split out monkey patching

Rakefile

@@ -63,6 +63,7 @@ Rake::RDocTask.new do |rdoc|
   rdoc.rdoc_files.include('README*')
   rdoc.rdoc_files.include('lib/**/*.rb')
   rdoc.rdoc_files.exclude('lib/middleman/features/sprockets+ruby19.rb')
+  rdoc.rdoc_files.exclude('lib/middleman/templater+dynamic_renderer.rb')
 end
 
 desc "Build and publish documentation using GitHub Pages."

lib/middleman/builder.rb

@@ -1,4 +1,5 @@
 require 'templater'
+require 'middleman/templater+dynamic_renderer.rb'
 require 'rack/test' # Use Rack::Test to access Sinatra without starting up a full server
 
 # Placeholder for any methods the builder needs to abstract to allow feature integration
@@ -46,34 +47,3 @@ module Middleman
     add :build, ::Middleman::Builder
   end
 end
-
-# Monkey-patch to use a dynamic renderer
-class Templater::Actions::File
-  def identical?
-    if exists?
-      return true if File.mtime(source) < File.mtime(destination)
-      FileUtils.identical?(source, destination)
-    else
-      false
-    end
-  end
-end
-
-class Templater::Actions::Template
-  def render
-    # The default render just requests the page over Rack and writes the response
-    request_path = destination.gsub(File.join(Dir.pwd, Middleman::Base.build_dir), "")
-    browser = Rack::Test::Session.new(Rack::MockSession.new(Middleman::Base))
-    browser.get(request_path)
-    browser.last_response.body
-  end
-
-  def identical?
-    if File.exists?(destination)
-      return true if File.exists?(source) && File.mtime(source) < File.mtime(destination)
-      File.read(destination) == render 
-    else
-      false
-    end
-  end
-end