further improvements

cmd/monkey/main.go

@@ -13,12 +13,14 @@ func main() {
 		version bool
 		simple  bool
 		debug   bool
+		trace   bool
 	)
 
 	flag.BoolVar(&compile, "c", false, "Compile a monkey file into a '.mc' bytecode file")
 	flag.BoolVar(&simple, "s", false, "Use simple REPL instead of opening a terminal")
 	flag.BoolVar(&version, "v", false, "Print Monkey version information")
-	flag.BoolVar(&debug, "d", false, "Enable debug mode")
+	flag.BoolVar(&debug, "D", false, "Enable Compiler and VM debugging")
+	flag.BoolVar(&trace, "T", false, "Enable VM tracing")
 	flag.Parse()
 
 	switch {
@@ -29,12 +31,12 @@ func main() {
 		monkey.PrintVersionInfo(os.Stdout)
 
 	case flag.NArg() > 0:
-		monkey.ExecFileVM(flag.Arg(0), flag.Args()[1:], debug)
+		monkey.ExecFileVM(flag.Arg(0), flag.Args()[1:], debug, trace)
 
 	case simple:
-		monkey.SimpleVmREPL(flag.Args(), debug)
+		monkey.SimpleVmREPL(flag.Args(), debug, trace)
 
 	default:
-		monkey.VmREPL(flag.Args(), debug)
+		monkey.VmREPL(flag.Args(), debug, trace)
 	}
 }