[Go] Golang flag 获取多个值

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// Value is the interface to the dynamic value stored in a flag.
// (The default value is represented as a string.)
//
// If a Value has an IsBoolFlag() bool method returning true,
// the command-line parser makes -name equivalent to -name=true
// rather than using the next command-line argument.
//
// Set is called once, in command line order, for each flag present.
// The flag package may call the String method with a zero-valued receiver,
// such as a nil pointer.
type Value interface {
	String() string
	Set(string) error
}

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type argFlags []string

func (a *argFlags) Set(s string) error {
    *a = append(*a, s)
    return nil
}

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

var args argFlags

func main() {
    flag.Var(&args, "args", "command line arguments")
    flag.Parse()
    fmt.Printf("%+v", args)
}

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$ ./main --args foo --args bar