class Kramdown::Converter::Latex

def convert_codeblock(el, opts)
  show_whitespace = el.attr['class'].to_s =~ /\bshow-whitespaces\b/
  lang = el.attr['lang']
  if show_whitespace || lang
    result = "\\lstset{showspaces=%s,showtabs=%s}\n" % (show_whitespace ? ['true', 'true'] : ['false', 'false'])
    result += "\\lstset{language=#{lang}}\n" if lang
    result += "\\lstset{basicstyle=\\ttfamily\\footnotesize}\\lstset{columns=fixed,frame=tlbr}\n"
    attrs = attribute_list(el)
    "#{result}\\begin{lstlisting}#{attrs}\n#{el.value}\n\\end{lstlisting}#{attrs}\n"
  else
    "\\begin{verbatim}#{el.value}\\end{verbatim}\n"
  end
end