Golang multi-value flag

gistfile1.txt

package main

import (
    "flag"
    "strings"
)

type arrayFlags []string

func (a *arrayFlags) String() string {
    return strings.Join(*a, ", ")
}

func (a *arrayFlags) Set(value string) error {
    *a = append(*a, value)
    return nil
}

func main() {
    var serverURLs arrayFlags
    flag.Var(&serverURLs, "serverURL", "URL of server to connect to. Multiple OK")
    flag.Parse()
    // ...
}