docs: def module(args):
      " Copy module source to current directory. "
  
      mod = op.join(settings.MOD_DIR, args.MODULE)
      assert op.exists(mod), "Not found module: %s" % args.MODULE
      if not args.DEST.startswith(op.sep):
          args.DEST = op.join(getcwd(), args.DEST)
      print_header("Copy module source")
      copytree(mod, args.DEST)