class HighLine::Question

Pathname. Any other time, this method will return an empty Array.
only known when _answer_type_ is set to an Array of choices, File, or
Returns an Array of valid answers to this question. These answers are

def selection
  if completion.is_a?(Array)
    completion
  elsif [File, Pathname].include?(completion)
    Dir[File.join(directory.to_s, glob)].map do |file|
      File.basename(file)
    end
  else
    []
  end
end