cf

type CF struct {
	UI      UI
	Help    Help
	Cmds    []Cmd
	Version string
}

type Cmd interface {
	Match(args []string) bool
	Run(args []string) error
}

type Help interface {
	Short()
	Long()
}

type UI interface {
	Prompt(prompt string) string
	Output(format string, a ...interface{})
	Error(err error)
}