gistfile1.ru

    #adds tags where categories don't match up
    if data.has_key?('categories')
      tags = data['tags'] || []
      placement_tags = []

      data['categories'].values.map{|c| c.split('/')}.flatten.each do |cat|
        unless cat.empty? || tags.include?(cat) || placement_tags.include?(cat)
          cat = '@' + cat
          placement_tags << cat unless tags.include?(cat) || placement_tags.include?(cat)
        end
      end

      data['tags'] = placement_tags + tags
    end