class Kramdown::Converter::Html
  def add_block_count(attr)
    @block_count ||= 0
    @block_count += 1
    unless attr["id"]
      attr["id"] = "b:#{@block_count}"
    end
  end

  %i(format_as_block_html format_as_indented_block_html).each do |method|
    alias_method :"original_#{method}", method
    define_method(method) do |*args|
      add_block_count(args[1])
      send(:"original_#{method}", *args)
    end
  end
end