class Kramdown::Converter::Base

def generate_id(str)
  gen_id = str.gsub(/[^a-zA-Z0-9 -]/, '').gsub(/^[^a-zA-Z]*/, '').gsub(' ', '-').downcase
  gen_id = 'section' if gen_id.length == 0
  @used_ids ||= {}
  if @used_ids.has_key?(gen_id)
    gen_id += '-' + (@used_ids[gen_id] += 1).to_s
  else
    @used_ids[gen_id] = 0
  end
  @doc.options[:auto_id_prefix] + gen_id
end