func addSubCommand(parent *c.Commander, subcmd *c.Commander) *c.Commander {
if parent == nil {
parent = baseCommand
}
subcmd.Parent = parent
subcmd.Commands = make([]*c.Command, 0, 2)
subcmd.Commanders = make([]*c.Commander, 0, 1)
parent.Commanders = append(parent.Commanders, subcmd)
return subcmd
}
