gistfile1.txt

module Liquid::Tags

  class PageBanners < ::Liquid::Tag

    Syntax = /(#{::Liquid::Expression}+)\s+max\s+([0-9]+)/

    def initialize(tag_name, markup, tokens, context)
      if markup =~ Syntax
        @collection_name = $1
        @max_number = $2
      else
        raise ::Liquid::SyntaxError.new("Syntax Error in 'pages_banners' - Valid syntax: page_banners <collection> max <number>")
      end
      super
    end

    def render(context)
      collection = context[@collection_name]

      segment = collection.slice(0, @max_number)

      segment.inject('') do |html, banner|
        html += %{<div class="banner"><img src="#{banner.url}" alt="#{banner.title}" /></div>}
      end
    end

    ::Liquid::Template.register_tag('page_banners', PageBanners)
  end



end