module Annotatable::ClassMethods

def annotate(*attrs)
  options = {}
  options = attrs.pop if attrs.last.kind_of?(Hash)
  options.symbolize_keys!
  inherit = options[:inherit]
  if inherit
    @inherited_annotations ||= []
    @inherited_annotations += attrs
  end
  attrs.each do |attr|
    class_eval %{
      def self.#{attr}(string = nil)
        @#{attr} = string || @#{attr}
      end
      def #{attr}(string = nil)
        self.class.#{attr}(string)
      end
      def self.#{attr}=(string = nil)
        #{attr}(string)
      end
      def #{attr}=(string = nil)
        self.class.#{attr}=(string)
      end
    }
  end
  attrs
end