code: def sanitize_code_blocks(text)
        text.gsub(/<pre>(.+?)<\/pre>/m) do
          code = $1.sub(/^\s*\n/, '')
          indent = code.gsub(/\n[ \t]*\n/, "\n").scan(/^ */).map{ |i| i.size }.min
          code.gsub!(/^#{' ' * indent}/, '') if indent > 0
          
          "<pre>#{code}</pre>"
        end
      end
docs: primarily for removing leading whitespace in <pre> tags