module Playbook::NumberSpacing

def self.included(base)
  base.prop :number_spacing
end

def number_spacing_options
  {
    number_spacing: "ns",
  }
end

def number_spacing_props
  selected_index_props = number_spacing_options.keys.select { |sk| try(sk) }
  return nil unless selected_index_props.present?
  selected_index_props.map do |k|
    index_value = send(k)
    "ns_#{index_value}" if number_spacing_values.include? index_value
  end.compact.join(" ")
end

def number_spacing_values
  %w[tabular]
end