gistfile1.rb

require 'liquid'

module SMIL
  module Helper    
    class AssetTag < ::Liquid::Block
      def initialize(tag_name, id, tokens)
        super
        @asset_id = id
        @attributes ||= {}
      end
      
      def render(context)
        # FIXME I should be using the asset's to_smil method, but it's not done yet...
        output = <<-EOF
          <asset mock="true" id="#{@asset.id}" #{@attributes.collect{|k,v| "#{k}='#{v.strip}'"}.join(" ")} />
        EOF
        EventDispatcher.dispatch! :rendered_asset, @asset_id
        return output
      end      
      
      def unknown_tag(name, params, tokens)
        @attributes ||= {}
        @attributes[name] = params
      end
      
      def dispatcher
        SMIL::EventDispatcher
      end
    end
    
  end
end

Liquid::Template.register_tag('asset', SMIL::Helper::AssetTag)