feat: restructure cli arguments

main.go

@@ -11,7 +11,7 @@ import (
 )
 
 func main() {
-	var song_url, output_folder string
+	var output_folder string
 
 	application := app.NewApp()
 
@@ -20,13 +20,12 @@ func main() {
 		EnableShellCompletion: true,
 		DefaultCommand:        "help",
 		Usage:                 "Spotify downloader with playlist sync in mind.",
-		Flags: []cli.Flag{
-			&cli.StringFlag{
+		Commands: []*cli.Command{
+			&cli.Command{
 				Name:    "download",
 				Aliases: []string{"d"},
 				Usage:   "download a song/playlist",
-				Destination: &song_url,
-			},
+				Flags: []cli.Flag{
 					&cli.StringFlag{
 						Name:        "output",
 						Aliases:     []string{"o"},
@@ -35,9 +34,12 @@ func main() {
 					},
 				},
 				Action: func(ctx context.Context, cmd *cli.Command) error {
+					song_url := cmd.Args().First()
 					err := pkg.Download(application, song_url, output_folder)
 					return err
 				},
+			},
+		},
 	}
 	if err := cmd.Run(context.Background(), os.Args); err != nil {
 		log.Fatal(err)