mdblock.rb

# MarkdownBlock
# Insert & parse Markdown anywhere, even nested in html
#
# Author: Matthew Chan <matt@themattchan.com>
# Date: January 2015
# License: GNU GPL
#
# Usage:
# {% markdown %} 
# <md_text>
# {% endmarkdown %}

module Jekyll
  class MarkdownBlock < Liquid::Block

    def initialize(tag_name, text, tokens)
      super
    end

    require "kramdown"
    def render(context)
      content = super
      "#{Kramdown::Document.new(content,:input => 'GFM').to_html}"
    end

  end
end
Liquid::Template.register_tag('markdown', Jekyll::MarkdownBlock)