class RuboCop::Cop::Style::FormatString

def autocorrect_to_percent(corrector, node)
  format_arg, *param_args = node.arguments
  format = format_arg.source
  args = if param_args.one?
           format_single_parameter(param_args.last)
         else
           "[#{param_args.map(&:source).join(', ')}]"
         end
  corrector.replace(node, "#{format} % #{args}")
end