a.rb

=begin
  def method_missing(name, *argv, &block)
    if name =~ /^def_/
      source, args = block.to_source(argv)
      def_macro(name, source, args)
    else
      p 'macro_' + name.to_s
      if Ixia.method_defined?(('macro_' + name.to_s).to_sym)
        Ixia.send('macro_' + name.to_s)
      else
        super
      end
    end
  end

  def def_macro(name, source, args)
    p name
    p source
    p args
  end
=end