class Kramdown::Converter::Html

def convert_codeblock(el, indent)
  attr = el.attr.dup
  lang = extract_code_language!(attr)
  if @coderay_enabled && (lang || @options[:coderay_default_lang])
    opts = {:wrap => @options[:coderay_wrap], :line_numbers => @options[:coderay_line_numbers],
      :line_number_start => @options[:coderay_line_number_start], :tab_width => @options[:coderay_tab_width],
      :bold_every => @options[:coderay_bold_every], :css => @options[:coderay_css]}
    lang = (lang || @options[:coderay_default_lang]).to_sym
    result = CodeRay.scan(el.value, lang).html(opts).chomp << "\n"
    "#{' '*indent}<div#{html_attributes(attr)}>#{result}#{' '*indent}</div>\n"
  else
    result = escape_html(el.value)
    result.chomp!
    if el.attr['class'].to_s =~ /\bshow-whitespaces\b/
      result.gsub!(/(?:(^[ \t]+)|([ \t]+$)|([ \t]+))/) do |m|
        suffix = ($1 ? '-l' : ($2 ? '-r' : ''))
        m.scan(/./).map do |c|
          case c
          when "\t" then "<span class=\"ws-tab#{suffix}\">\t</span>"
          when " " then "<span class=\"ws-space#{suffix}\">&#8901;</span>"
          end
        end.join('')
      end
    end
    code_attr = {}
    code_attr['class'] = "language-#{lang}" if lang
    "#{' '*indent}<pre#{html_attributes(attr)}><code#{html_attributes(code_attr)}>#{result}\n</code></pre>\n"
  end
end