Wikipedia link for Jykell

wikipedia.rb

=begin
Put this file _plugins directory in Jekyll(create if it doesn't exist)
You need to set the below configuration in _config.yml

wikipedia:en (or de, ja, zh)

You can use this tag in markdown file like:
{% wikiepdia term %}
or
{% wikipedia term,lang %} (if you want to specify another language wikipedia than configuration)

Expample (in the case you specify wikipedia:en in _config.yml):
{% wikipedia test %}
-> <a href="http://en.wikipedia.org/wiki/test">test</a>
{% wikipedia test,fr %}
-> <a href="http://fr.wikipedia.org/wiki/test">test</a>


=end

module Jekyll
  class WikipediaTag < Liquid::Tag
    def initialize(tag_name, term, tokens)
      super
      @term = term
     end

    def render(context)
       ar =  @term.strip.split(",")
       if ar[1]
        term = ar[0]
        lang = ar[1]
      else
        site = context.registers[:site]
        lang = site.config["wikipedia"]
        term = @term
      end
    "<a href=\"http://#{lang}.wikipedia.org/wiki/#{term}\">#{term}</a>"
    end
  end
end

Liquid::Template.register_tag("wikipedia", Jekyll::WikipediaTag)