1 files changed, 53 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/mime_responds.rb b/actionpack/lib/action_controller/mime_responds.rb
new file mode 100644
index 0000000000..7a60a5cc37
--- /dev/null
+++ b/actionpack/lib/action_controller/mime_responds.rb
@@ -0,0 +1,53 @@
+module ActionController #:nodoc:
+  module MimeResponds #:nodoc:
+    def self.included(base)
+      base.send(:include, ActionController::MimeResponds::InstanceMethods)
+    end
+
+    module InstanceMethods
+      def respond_to(&block)
+        responder = Responder.new(block.binding)
+        yield responder
+        responder.respond
+      end
+    end
+    
+    class Responder #:nodoc:
+      def initialize(block_binding)
+        @block_binding = block_binding
+        @mime_type_priority = eval("request.accepts", block_binding)
+        @order     = []
+        @responses = {}
+      end
+      
+      for mime_type in %w( all html js xml rss atom yaml )
+        eval <<-EOT
+          def #{mime_type}(&block)
+            @order << Mime::#{mime_type.upcase}
+            @responses[Mime::#{mime_type.upcase}] = block
+          end
+        EOT
+      end
+      
+      def respond
+        for priority in @mime_type_priority
+          if priority == Mime::ALL
+            @responses[@order.first].call
+            return
+          else
+            if @order.include?(priority)
+              @responses[priority].call
+              return # mime type match found, be happy and return
+            end
+          end
+        end
+        
+        if @order.include?(Mime::ALL)
+          @responses[Mime::ALL].call
+        else
+          eval 'render(:nothing => true, :status => "406 Not Acceptable")', @block_binding
+        end
+      end
+    end
+  end
+end