add -l flag: listen for messages

go-sendxmpp.go

@@ -237,6 +237,7 @@ func main() {
 	flagSkipVerify := getopt.BoolLong("no-tls-verify", 'n',
 		"Skip verification of TLS certificates (not recommended).")
 	flagRaw := getopt.BoolLong("raw", 0, "Send raw XML.")
+	flagListen := getopt.BoolLong("listen", 'l', "Listen for first message from user and echo.")
 
 	// Parse command line flags.
 	getopt.Parse()
@@ -248,10 +249,11 @@ func main() {
 	}
 
 	// Read recipients from command line and quit if none are specified.
-	// For sending raw XML it's not required to specify a recipient except
-	// for MUCs (go-sendxmpp will join the MUC automatically).
+	// For listening or sending raw XML it's not required to specify a recipient except
+	// when sending raw messages to MUCs (go-sendxmpp will join the MUC automatically).
 	recipients := getopt.Args()
-	if (len(recipients) == 0 && !*flagRaw) || (len(recipients) == 0 && *flagChatroom) {
+	if (len(recipients) == 0 && !*flagRaw && !*flagListen) ||
+		(len(recipients) == 0 && *flagChatroom) {
 		log.Fatal("No recipient specified.")
 	}
 
@@ -361,7 +363,8 @@ func main() {
 	}
 
 	// Skip reading message if '-i' or '--interactive' is set to work with e.g. 'tail -f'.
-	if !*flagInteractive {
+	// Also for listening mode.
+	if !*flagInteractive && !*flagListen {
 		if message == "" {
 
 			scanner := bufio.NewScanner(os.Stdin)
@@ -418,6 +421,24 @@ func main() {
 		return
 	}
 
+	if *flagListen {
+		for {
+			recieved, err := client.Recv()
+			if err != nil {
+				log.Println(err)
+			}
+
+			switch v := recieved.(type)  {
+			case xmpp.Chat:
+				if v.Text != "" {
+					fmt.Println(v.Text)
+				}
+			default:
+				continue
+			}
+		}
+	}
+
 	// Send message to chatroom(s) if the flag is set.
 	if *flagChatroom {