require 'epubber/models/introduction'

module Epubber::Models::Concerns
  module HasIntroduction
    def introduction(&block)
      @introduction ||= nil
      return @introduction unless block_given?
      @introduction = Epubber::Models::Introduction.new
      @introduction.instance_eval &block
    end

    def contextified_introduction
      return nil if introduction.nil?
      return introduction.contextify
    end
  end
end