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

I made it just for you:

package main

import (
  "fmt";
  "os"
)

func main() {
  for i, arg := range os.Args {
    if arg == "-help" {
      fmt.Printf ("I need somebody\n")
    }else if arg == "-version" {
      fmt.Printf ("Version Zero\n")
    } else {
      fmt.Printf("arg %d: %s\n", i, os.Args[i])
    }
  }
}

see also https://play.golang.org/p/XtNXG-DhLI

Test:

$ ./8.out -help -version monkey business
I need somebody
Version Zero
arg 3: monkey
arg 4: business