module Kramdown

def self.data_dir
  unless defined?(@data_dir)
    require 'rbconfig'
    @data_dir = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'data', 'kramdown'))
    @data_dir = File.expand_path(File.join(RbConfig::CONFIG["datadir"], "kramdown")) unless File.exist?(@data_dir)
    raise "kramdown data directory not found! This is a bug, please report it!" unless File.directory?(@data_dir)
  end
  @data_dir
end