module Temple::Mixins::DefaultOptions

def default_options
  @default_options ||= OptionHash.new(superclass.respond_to?(:default_options) ?
                                      superclass.default_options : nil) do |hash, key, deprecated|
    unless @option_validator_disabled
      if deprecated
        warn "Option #{key.inspect} is deprecated by #{self}"
      else
        # TODO: This will raise an exception in the future!
        # raise ArgumentError, "Option #{key.inspect} is not supported by #{self}"
        warn "Option #{key.inspect} is not supported by #{self}"
      end
    end
  end
end