module Jekyll

  class NavTree < Liquid::Tag
    def initialize(tag_name, text, tokens)
      super
    end

    def render(context)
      site = context.registers[:site]
      output = '<ul>'
      temp = site.pages.sort do |x,y|
        unless defined? y.data['order'] then y.data['order'] = 0 end
        unless defined? x.data['order'] then x.data['order'] = 0 end
        y.data['order'].to_i  <=> x.data['order'].to_i
      end
      temp.each do |page|
        if page.data['title'].nil? or page.data['shownav'] == false then next end
        output += '<li><a href="'+page.url+'">'+page.data['title']+'</a></li>'
				output += '<img src="/images/separator.png">'
      end
      output += '</ul>'

      output
    end
  end

end

Liquid::Template.register_tag('nav_tree', Jekyll::NavTree)