Can command line flags in Go be set to mandatory?

Question

Is there a way how to set that certain flags are mandatory, or do I have to check for their presence on my own?

Answer 1

go-flags lets you declare both required flags and required positional arguments:

var opts struct {
    Flag string `short:"f" required:"true" name:"a flag"`
    Args struct {
        First   string `positional-arg-name:"first arg"`
        Sencond string `positional-arg-name:"second arg"`
    } `positional-args:"true" required:"2"`
}
args, err := flags.Parse(&opts)