module Jekyll::Converters::Markdown::RedcarpetParser::CommonMethods

def add_code_tags(code, lang)
  code = code.to_s
  code = code.sub(
    %r!<pre>!,
    "<pre><code class=\"language-#{lang}\" data-lang=\"#{lang}\">"
  )
  code = code.sub(%r!</pre>!, "</code></pre>")
  code
end