module Thor::Base::ClassMethods

def from_superclass(method, default=nil)

returns default.
Retrieves a value from superclass. If it reaches the baseclass, 
def from_superclass(method, default=nil)
  if self == baseclass || !superclass.respond_to?(method, true)
    default
  else
    value = superclass.send(method)
    if value
      if value.is_a?(TrueClass) || value.is_a?(Symbol)
        value
      else
        value.dup
      end
    end
  end
end