split the `-addr` flag into separate host and port flags

go/linguaevalia/linguaevalia.go

var homePageTemplate = template.Must(template.New("homepage").Parse(homePageTemplateStr))
func runServer() {
	fmt.Printf("running on %s\n", *address)
	address := fmt.Sprintf("%s:%d", *host, *port)
	fmt.Printf("running on %s\n", address)
	http.HandleFunc("/run", runCodeHandler)
	http.HandleFunc("/codemirror.js", func(w http.ResponseWriter, r *http.Request) {
	})
	http.HandleFunc("/", homePageHandler)
	err := http.ListenAndServe(*address, nil)
	err := http.ListenAndServe(address, nil)
	if err != nil {
		log.Fatal(err)
	}
}
var language = flag.String("l", "", "The language to use for code passed via stdin.")
var address = flag.String("addr", "localhost:8000", "The host and port to listen on.")
var host = flag.String("h", "localhost", "The host to listen on.")
var port = flag.Int("p", 8000, "The port to listen on.")
func main() {
	cmd, args := parseCommand()