class RuboCop::Formatter::FormatterSet

def add_formatter(formatter_type, output_path = nil)
  formatter_class = case formatter_type
                    when Class
                      formatter_type
                    when /\A[A-Z]/
                      custom_formatter_class(formatter_type)
                    else
                      builtin_formatter_class(formatter_type)
                    end
  if output_path
    dir_path = File.dirname(output_path)
    FileUtils.mkdir_p(dir_path) unless File.exist?(dir_path)
    output = File.open(output_path, 'w')
  else
    output = $stdout
  end
  self << formatter_class.new(output)
end

def builtin_formatter_class(specified_key)
  matching_keys = BUILTIN_FORMATTERS_FOR_KEYS.keys.select do |key|
    key.start_with?(specified_key)
  end
  if matching_keys.empty?
    fail %(No formatter for "#{specified_key}")
  elsif matching_keys.size > 1
    fail %(Cannot determine formatter for "#{specified_key}")
  end
  BUILTIN_FORMATTERS_FOR_KEYS[matching_keys.first]
end

def close_output_files
  each do |formatter|
    formatter.output.close if formatter.output.is_a?(File)
  end
end

def custom_formatter_class(specified_class_name)
  constant_names = specified_class_name.split('::')
  constant_names.shift if constant_names.first.empty?
  constant_names.reduce(Object) do |namespace, constant_name|
    namespace.const_get(constant_name, false)
  end
end

def file_finished(file, offenses)
  if @cop_disabled_line_ranges.any? &&
     # Don't check unneeded disable if --only or --except option is
     # given, because these options override configuration.
     (@options[:except] || []).empty? && (@options[:only] || []).empty?
    config = @config_store.for(file)
    if config['Lint/UnneededDisable']['Enabled']
      cop = Cop::Lint::UnneededDisable.new(config, @options)
      cop.check(offenses, @cop_disabled_line_ranges, @comments)
      offenses += cop.offenses
    end
  end
  offenses = offenses.sort.reject(&:disabled?)
  each { |f| f.file_finished(file, offenses) }
  offenses
end

def file_started(file, options)
  @cop_disabled_line_ranges = options[:cop_disabled_line_ranges]
  @comments = options[:comments]
  @options = options[:cli_options]
  @config_store = options[:config_store]
  each { |f| f.file_started(file, options) }
end