recompile_vars.rb

    def mote(template, params = {})
      variables = mote_process_variables(mote_cache, template, params)
      mote_cache[template] ||= Mote.parse(template, self, variables)
      mote_cache[template][params]
    end

    def mote_file(filename, params = {})
      variables = mote_process_variables(mote_files, filename, params)
      mote_files[filename] ||= Mote.parse(File.read(filename), self, variables)
      mote_files[filename][params]
    end

    def mote_process_variables(cache, key, params)
      variables = Set.new(params.keys.map &:to_sym)
      seen_variables = mote_template_variables[key]

      unless (variables - seen_variables).empty?
        seen_variables += variables
        cache.delete(key)
      end

      seen_variables
    end

    def mote_template_variables
      @_mote_template_variables ||= Hash.new{|h, k| h[k] = Set.new}
    end