class RuboCop::Formatter::EmacsStyleFormatter

The output is machine-parsable.
easy to process in the Emacs text editor.
This formatter displays the report data in format that’s

def file_finished(file, offenses) 

def file_finished(file, offenses)
  offenses.each do |o|
    message = if o.corrected?
                "[Corrected] #{o.message}"
              else
                o.message
              end
    output.printf("%s:%d:%d: %s: %s\n",
                  file, o.line, o.real_column, o.severity.code,
                  message.tr("\n", ' '))
  end
end