Ejemplo de uso de `flag` para parsear parametros de un string

flag_example.go

package main

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

type flagT string

//implementacion de interface flag.Value
func (f *flagT) String() string {
	return string(*f)
}

func (f *flagT) Set(v string) error {
	*f = flagT(v)
	return nil
}

var (
	a flagT
	b flagT
	c flagT
)

func main() {
	input := "-a 1 -b 2 -c 3"
	args := strings.Split(input, " ")
	/*
		ContinueOnError ErrorHandling = iota // Return a descriptive error.
		ExitOnError                          // Call os.Exit(2).
		PanicOnError                         // Call panic with a descriptive error.
	*/
	commandLine := flag.NewFlagSet("test", flag.ContinueOnError)

	commandLine.Var(flag.Value(&a), "a", "flag llamada a")
	commandLine.Var(flag.Value(&b), "b", "flag llamada b")
	commandLine.Var(flag.Value(&c), "c", "flag llamada c")

	commandLine.Parse(args)

	fmt.Printf("a=%s, b=%s, c=%s", a, b, c)
}