Middleman helper that acts as thin wrapper for the image_tag helper. It generates the srcset attribute for regular image tags.

image_set_tag_helper.rb

helpers do
  # Acts as a thin wrapper for image_tag and generates a srcset attribute for regular image tags
  # for usage with responsive images, supports middleman's asset_path helper.
  #
  # image_set_tag 'pic_1980.jpg', { 'pic_640.jpg' => '640w', 'pic_1024.jpg' => '1024w', 'pic_1980.jpg' => '1980w' }, sizes: '100vw', class: 'my-image'
  #
  # => <img src="/assets/ants_1980.jpg" srcset="/assets/pic_640.jpg 640w, /assets/pic_1024.jpg 1024w, /assets/pic_1980.jpg 1980w" sizes="100vw" class="my-image">
  #
  def image_set_tag(source, srcset = {}, options = {})
    srcset = srcset.map { |src, size| "#{asset_path(:images, src)} #{size}" }.join(', ')
    image_tag(source, options.merge(srcset: srcset))
  end
end