Add cmd line

work in progress (I don't like this code)

tools/dumper.go

 package main
 
 import (
+	"flag"
 	"fmt"
 	"log/slog"
 
@@ -11,20 +12,30 @@ var (
 	msgCnt int = 0
 )
 
-func showMessage(msg *xaal.Message) {
-	if !msg.IsAlive() {
-		msgCnt++
-		fmt.Println("Message:", msgCnt)
-		msg.Dump()
-		fmt.Println()
+func showMessage(msg *xaal.Message, filter bool) {
+	if filter && msg.IsAlive() {
+		return
 	}
+	msgCnt++
+	fmt.Println("Message:", msgCnt)
+	msg.Dump()
+	fmt.Println()
 }
 
 func main() {
+	// parse cmd line
+	flagAliveFilter := flag.Bool("alive-filter", true, "Enable/Disable Alive filtering")
+	// flagUUID := flag.String("f", "", "UUID to filter messages")
+	flag.Parse()
+
+	showMSG := func(msg *xaal.Message) {
+		showMessage(msg, *flagAliveFilter)
+	}
+
 	xaal.SetupLogger(slog.LevelInfo)
 	eng := xaal.NewEngine()
 	eng.DisableMessageFilter()
 
-	eng.Subscribe(showMessage)
+	eng.Subscribe(showMSG)
 	eng.Run()
 }