Middleman retina_image_tag

gistfile1.txt

helpers do
  def retina_image_tag(default_name, options={})
    retina_name = default_name.gsub(%r{\.\w+$}, '@2x\0')
    image_tag(default_name, options.merge('data-interchange' => "[#{asset_path(:images, retina_name)}, (retina)]"))
  end
end

Using the data-interchange by foundation.
Place this snippet in config.rb, make sure foundation.js and foundation.interchange.js are called
And also :

$ ->
  $(document).foundation()

Use like this :

= retina_image_tag 'path/of/the/pic.jpg'