# Pastebin hbBGYGfV
class X
  module Methods
    def hi
      "Hi #{options.fetch(:name)}"
    end

    def bye
      "Bye #{options.fetch(:name)}"
    end
  end

  class << self
    include Methods
    attr_reader :options

    def config(options)
      @options = options
    end
  end

  include Methods
  attr_reader :options

  def initialize(options = {})
    @options = self.class.options.merge(options)
  end
end

X.config name: 'foo'
p X.hi #=> "Hi foo"
p X.new(name: 'bar').hi #=> "Hi bar"
p X.bye #=> "Bye foo"