# File lib/rbot/config.rb, line 213
    def handle_list(m, params)
      modules = []
      if params[:module]
        @@items.each_key do |key|
          mod, name = key.to_s.split('.')
          next unless mod == params[:module]
          modules.push key unless modules.include?(name)
        end
        if modules.empty?
          m.reply "no such module #{params[:module]}"
        else
          m.reply modules.join(", ")
        end
      else
        @@items.each_key do |key|
          name = key.to_s.split('.').first
          modules.push name unless modules.include?(name)
        end
        m.reply "modules: " + modules.join(", ")
      end
    end