Read flag string like "a, b, c" to [a, b, c]

array_flag.go

// used for parsing slice from flag input string
// read flag string like "a, b, c" and output [a, b, c]
package main

import (
	"fmt"
	"strings"
	"flag"
)

var f ArrayFlag

func init() {
     flag.Var(&f, "arrayflags", "array flag test")
}

type ArrayFlag []string

func (a *ArrayFlag) String() string {
	return fmt.Sprint(*a)
}

func (a *ArrayFlag) Set(val string) error {
	tmp := strings.Split(val, ",")
	for i:=0; i<len(tmp); i++ {
		tmp[i] = strings.Trim(tmp[i], " ")
	}
	*a = ArrayFlag(tmp)
	return nil
}