require 'pathname'
 
 module Jekyll
 
   class IncludePartialTag < Liquid::Tag
     def initialize(tag_name, file, tokens)
       super
       @file = file.strip
     end
 
     def render(context)
       file_dir = (context.registers[:site].source || 'source')
       file_path = Pathname.new(file_dir).expand_path
       file = file_path + @file
 
       unless file.file?
         return "File #{file} could not be found"
       end
 
       Dir.chdir(file_path) do
         partial = Liquid::Template.parse(file.read)
         context.stack do
           partial.render(context)
         end
       end
     end
   end
 end
 
 Liquid::Template.register_tag('include_partial', Jekyll::IncludePartialTag)