cmdopt

opt := cmdopt.New(...)

// 子命令 build，为一个 flag.FlagSet 实例
build := opt.New("build", "title", "usage", func(f *flag.FlagSet) DoFunc {
    v := f.Bool("v", "false", ...)

    return func(output io.Writer)error{
        if v {
            ...
        } else {
            output.Write([]byte("build"))
        }
    }
})

// 子命令 install
install := opt.New("install", "title", "usage", func(*flag.FlagSet) DoFunc {
    return func(output io.Writer)error{
        output.Write([]byte("install"))
    }
})

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