class RuboCop::Formatter::FormatterSet

def add_formatter(formatter_type, output_path = nil)
  if output_path
    dir_path = File.dirname(output_path)
    FileUtils.mkdir_p(dir_path)
    output = File.open(output_path, 'w')
  else
    output = $stdout
  end
  self << formatter_class(formatter_type).new(output, @options)
end

def builtin_formatter_class(specified_key)
  matching_keys = BUILTIN_FORMATTERS_FOR_KEYS.keys.select do |key|
    /^\[#{specified_key}\]/.match?(key) || specified_key == key.delete('[]')
  end
  raise %(No formatter for "#{specified_key}") if matching_keys.empty?
  raise %(Cannot determine formatter for "#{specified_key}") if matching_keys.size > 1
  formatter_name = BUILTIN_FORMATTERS_FOR_KEYS[matching_keys.first]
  RuboCop::Formatter.const_get(formatter_name)
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)
  each { |f| f.file_finished(file, offenses) }
  offenses
end

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

def formatter_class(formatter_type)
  case formatter_type
  when Class
    formatter_type
  when /\A[A-Z]/
    custom_formatter_class(formatter_type)
  else
    builtin_formatter_class(formatter_type)
  end
end

def initialize(options = {})
  super()
  @options = options # CLI options
end