getopt-like behavior in Go

Question

How do I nicely parse a list of program parameters and automate handling \"--help\" and/or \"--version\" (such as \"program [-d value] [--abc] [FILE1]\") in Go?

Answer 1

go-flags is very complete, BSD licensed, and has a clear example.

var opts struct {
      DSomething string `short:"d" description:"Whatever this is" required:"true"`
      ABC bool `long:"abc" description:"Something"`
}

fileArgs, err := flags.Parse(&opts)

if err != nil {
    os.Exit(1)
}