Add .rb template handler

This handler simply allows arbitrary Ruby code as a template

Author: guilleiguaran

actionpack/CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Rails 4.0.0 (unreleased) ##
 
+*   Add .rb template handler, this handler simply allows arbitrary Ruby code as a template. *Guillermo Iguaran*
+
 *   Add `separator` option for `ActionView::Helpers::TextHelper#excerpt`:
 
         excerpt('This is a very beautiful morning', 'very', :separator  => ' ', :radius => 1)

actionpack/lib/action_view/template/handlers.rb

@@ -10,6 +10,7 @@ def self.extended(base)
         base.register_default_template_handler :erb, ERB.new
         base.register_template_handler :builder, Builder.new
         base.register_template_handler :raw, Raw.new
+        base.register_template_handler :rb, :source.to_proc
       end
 
       @@template_handlers = {}

actionpack/test/fixtures/ruby_template.rb

@@ -0,0 +1,3 @@
+body = ""
+body << ["Hello", "from", "Ruby", "code"].join(" ")
+body

actionpack/test/template/render_test.rb

@@ -97,6 +97,14 @@ def test_render_raw_template_with_quotes
     assert_equal %q;Here are some characters: !@#$%^&*()-="'}{`; + "\n", @view.render(:template => "plain_text_with_characters")
   end
 
+  def test_render_rb_template_with_handlers
+    assert_equal "Hello from Ruby code", @view.render(:template => "ruby_template")
+  end
+
+  def test_render_rb_template_inline
+    assert_equal '4', @view.render(:inline => "(2**2).to_s", :type => :rb)
+  end
+
   def test_render_file_with_localization_on_context_level
     old_locale, @view.locale = @view.locale, :da
     assert_equal "Hey verden", @view.render(:file => "test/hello_world")