Some mime type refactoring. Closes #9957 [Josh Peek]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8001 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/caching.rb

@@ -251,7 +251,7 @@ module ActionController #:nodoc:
 
         private
           def set_content_type!(controller, extension)
-            controller.response.content_type = Mime::EXTENSION_LOOKUP[extension].to_s if extension
+            controller.response.content_type = Mime::Type.lookup_by_extension(extension).to_s if extension
           end
 
           def path_options_for(controller, options)

actionpack/lib/action_controller/mime_responds.rb

@@ -114,10 +114,7 @@ module ActionController #:nodoc:
         @request    = controller.request
         @response   = controller.response
 
-        format = @request.parameters[:format]
-        @mime_type_priority = format && Mime::EXTENSION_LOOKUP[format] ?
-          [ Mime::EXTENSION_LOOKUP[format] ] :
-          @request.accepts
+        @mime_type_priority = Array(Mime::Type.lookup_by_extension(@request.parameters[:format]) || @request.accepts)
 
         @order     = []
         @responses = {}
@@ -128,18 +125,10 @@ module ActionController #:nodoc:
 
         @order << mime_type
 
-        if block_given?
         @responses[mime_type] = Proc.new do
           @response.template.template_format = mime_type.to_sym
           @response.content_type = mime_type.to_s
-            block.call
-          end
-        else
-          @responses[mime_type] = Proc.new do
-            @response.template.template_format = mime_type.to_sym
-            @response.content_type = mime_type.to_s
-            @controller.send :render, :action => @controller.action_name
-          end
+          block_given? ? block.call : @controller.send(:render, :action => @controller.action_name)
         end
       end
 

actionpack/lib/action_controller/mime_type.rb

@@ -1,7 +1,7 @@
 module Mime
   SET              = []
-  EXTENSION_LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k == "" }
-  LOOKUP           = Hash.new { |h, k| h[k] = Type.new(k) unless k == "" }
+  EXTENSION_LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
+  LOOKUP           = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
 
   # Encapsulates the notion of a mime type. Can be used at render time, for example, with:
   #