class Rubocop::Formatter::ProgressFormatter

def report_file_as_mark(file, offences)
  mark = if offences.empty?
           '.'.color(:green)
         else
           highest_offence = offences.max do |a, b|
             a.severity_level <=> b.severity_level
           end
           color = COLOR_FOR_SEVERITY[highest_offence.severity]
           highest_offence.encode_severity.color(color)
         end
  output.write mark
end