Alternate ways of adding style_with

include_extend.rb

module Style
  def style
    # Special style handling
    @style
  end
end

module StyleWith
  def style_with(*styles)
    styles.map(&:to_sym).each do |style|
      define_method style do
        @style[style]
      end
      
      define_method "#{style}=" do |new_style|
        @style[style] = new_style
      end
    end
  end
end

class Arc
  include Style
  extend StyleWith
  
  style_with :wedge, :stroke, :fill
  
  def initialize(style = {})
    @style = style
  end
end

a = Arc.new
a.wedge = 100
a.wedge
#=> 100

included.rb

module Style
  def style
    # Special style handling
    @style
  end
  
  module StyleWith
    def style_with(*styles)
      styles.map(&:to_sym).each do |style|
        define_method style do
          @style[style]
        end
        
        define_method "#{style}=" do |new_style|
          @style[style] = new_style
        end
      end
    end
  end

  def self.included(klass)
    klass.extend StyleWith
  end
end

class Arc
  include Style

  style_with :wedge, :stroke, :fill
  
  def initialize(style = {})
    @style = style
  end
end

a = Arc.new
a.wedge = 100
a.wedge
#=> 100