configurable.rb in configurations-1.1.0

- old
+ new

@@ -18,12 +18,14 @@
     def install_configure_in(base)
       base.class_eval <<-EOF
         class << self
           # The central configure method
           # @params [Proc] block the block to configure host module with
+          # @raise [ArgumentError] error when not given a block
           #
           def configure(&block)
+            raise ArgumentError, 'can not configure without a block' unless block_given?
             @configuration = #{self}::Configuration.new(@configuration_defaults, @configurable, &block)
           end
         end
       EOF
     end
@@ -31,10 +33,12 @@
     # Class methods that will get installed in the host module
     #
     module ClassMethods
       # A reader for Configuration
       #
-      attr_reader :configuration
+      def configuration
+        @configuration ||= @configuration_defaults && configure { }
+      end
 
       # Configuration defaults can be used to set the defaults of any Configuration
       # @param [Proc] block setting the default values of the configuration
       #
       def configuration_defaults(&block)