lightbox.rb

# A Liquid tag for Jekyll sites that allows embedding Lightbox images.
#
# Adapted to work with http://lokeshdhakar.com/projects/lightbox2/
# as well as allowing remote image urls and commas in image titles.
#
# original author: kyoendo
# modified by: andystanton
#
# original Source URL: https://gist.github.com/4035604
# modified Source URL: https://gist.github.com/andystanton/6629cca760df386a0726
#
# Example usage: {% lightbox http://path/to/fullSizeUrl.png; http://path/to/thumbnailUrl.png; Image Title; Image Grouping %}
module Jekyll
  class LightboxTag < Liquid::Tag
    def initialize(tag_name, text, token)
      super
      @text = text
    end

    def render(context)
      fullSizeUrl, thumbnailUrl, title, grouping = @text.split(';').map(&:strip)
      %{<a href="#{fullSizeUrl}" data-lightbox="#{grouping || title}" data-title="#{title}"><img src="#{thumbnailUrl}" alt="#{title}" /></a>}
    end
  end
end

Liquid::Template.register_tag('lightbox', Jekyll::LightboxTag)