module Playbook::Spacing

def gap_props
  selected_gap_props = gap_options.keys.select { |sk| try(sk) }
  return nil unless selected_gap_props.present?
  selected_gap_props.map do |k|
    gap_value = send(k)
    "gap_#{gap_value}" if gap_values.include? gap_value
  end.compact.join(" ")
end