hoist option values out of helper to merged module as config

app/models/merged/option_definition.rb

@@ -1,4 +1,17 @@
 module Merged
+
+  # Quite simple mapping from name to usually  a selection of values.
+  # Options have type that can be set but usually is inferred from
+  # wether there is one values (select) other wise text.
+  # date is also supported.
+  #
+  # a corresponding ./app/views/merged/sections/_option_form_TYPE.haml
+  # nust exist to render the type.
+  #
+  # Also values may be provided by a module function/attribute on Merged.
+  # eg option text_color (also shade_color) have a Merged.text_color that return a
+  # hash. In this case so it is easy to customize the colors of the app.
+  #
   class OptionDefinition < SharedBase
 
     fields :name , :default , :description , :values , :type
@@ -13,11 +26,13 @@ module Merged
     end
 
     def has_values?
+      return true if Merged.respond_to?( name.to_sym )
       return false if attributes[:values].nil?
       ! attributes[:values].empty?
     end
 
     def values
+      return Merged.send(name.to_sym).keys if Merged.respond_to?( name.to_sym )
       return [] unless has_values?
       attributes[:values].split(" ")
     end