module Middleman::Blog::Similar::BlogArticleExtensions
  def similar_articles
    if !@similar_articles && similarity_algorithm
      @similar_articles = similarity_algorithm.similar_articles
    end
    @similar_articles || []
  end
  def words
    unless @words && similarity_algorithm
      @words = similarity_algorithm.words
    end
    @words
  end
  def similarity_algorithm
    if !@similarity_algorithm && (algorithm = app.similarity_algorithm)
      @similarity_algorithm = algorithm.new self
    end
    @similarity_algorithm
  end
  def untagged_body
    body.gsub(/<[^>]*>/ui,'')
  end
end