main: implement sudo and machinectl launcher methods

This does almost exactly what github:intgr/ego does, with some minor optimisations and corrections.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

cli.go

@@ -9,26 +9,17 @@ import (
 )
 
 var (
-	ego     *user.User
-	command []string
-	verbose bool
-	method  = machinectl
-
 	userName     string
 	methodFlags  [2]bool
 	printVersion bool
-)
-
-const (
-	machinectl uint8 = iota
-	machinectlBare
-	sudo
+	mustPulse    bool
 )
 
 func init() {
 	flag.StringVar(&userName, "u", "ego", "Specify a username")
 	flag.BoolVar(&methodFlags[0], "sudo", false, "Use 'sudo' to change user")
 	flag.BoolVar(&methodFlags[1], "bare", false, "Use 'machinectl' but skip xdg-desktop-portal setup")
+	flag.BoolVar(&mustPulse, "pulse", false, "Treat unavailable PulseAudio as fatal")
 	flag.BoolVar(&verbose, "v", false, "Verbose output")
 	flag.BoolVar(&printVersion, "V", false, "Print version")
 }
@@ -41,13 +32,6 @@ func copyArgs() {
 
 	command = flag.Args()
 
-	switch { // zero value is machinectl
-	case methodFlags[0]:
-		method = sudo
-	case methodFlags[1]:
-		method = machinectlBare
-	}
-
 	if u, err := user.Lookup(userName); err != nil {
 		if errors.As(err, new(user.UnknownUserError)) {
 			fmt.Println("unknown user", userName)
@@ -62,6 +46,6 @@ func copyArgs() {
 	}
 
 	if verbose {
-		fmt.Println("Running command", command, "as user", ego.Username, "("+ego.Uid+")")
+		fmt.Println("Running as user", ego.Username, "("+ego.Uid+"),", "command:", command)
 	}
 }