Don't connect to the XMPP server if the message is empty

CHANGELOG.md

@@ -14,6 +14,7 @@
 - Detect CNAME loops (max. 5 CNAMEs) (via xmppsrv >= v0.2.4).
 - Deprecate resource config option and command line flag.
 - Improve error handling in XML parsing.
+- Don't connect to the XMPP server if the message is empty.
 
 ## [v0.5.1] 2022-05-22
 ### Changed

main.go

@@ -267,6 +267,39 @@ func main() {
 		}
 	}
 
+	// Skip reading message if '-i' or '--interactive' is set to work with e.g. 'tail -f'.
+	// Also for listening mode.
+	if !*flagInteractive && !*flagListen {
+		if message == "" {
+
+			scanner := bufio.NewScanner(os.Stdin)
+			for scanner.Scan() {
+
+				if message == "" {
+					message = scanner.Text()
+				} else {
+					message = message + "\n" + scanner.Text()
+				}
+			}
+
+			if err := scanner.Err(); err != nil {
+				if err != io.EOF {
+					log.Fatal(err)
+				}
+			}
+		}
+	}
+
+	// Remove invalid code points.
+	message = strings.ToValidUTF8(message, "")
+	reg := regexp.MustCompile(`[\x{0000}-\x{0008}\x{000B}\x{000C}\x{000E}-\x{001F}]`)
+	message = reg.ReplaceAllString(message, "")
+
+	// Exit if message is empty.
+	if message == "" && !*flagInteractive {
+		os.Exit(0)
+	}
+
 	// Connect to server.
 	client, err := connect(options, *flagDirectTLS)
 	if err != nil {
@@ -357,34 +390,6 @@ func main() {
 			*flagHTTPUpload)
 	}
 
-	// Skip reading message if '-i' or '--interactive' is set to work with e.g. 'tail -f'.
-	// Also for listening mode.
-	if !*flagInteractive && !*flagListen {
-		if message == "" {
-
-			scanner := bufio.NewScanner(os.Stdin)
-			for scanner.Scan() {
-
-				if message == "" {
-					message = scanner.Text()
-				} else {
-					message = message + "\n" + scanner.Text()
-				}
-			}
-
-			if err := scanner.Err(); err != nil {
-				if err != io.EOF {
-					log.Fatal(err)
-				}
-			}
-		}
-	}
-
-	// Remove invalid code points.
-	message = strings.ToValidUTF8(message, "")
-	reg := regexp.MustCompile(`[\x{0000}-\x{0008}\x{000B}\x{000C}\x{000E}-\x{001F}]`)
-	message = reg.ReplaceAllString(message, "")
-
 	var msgType string
 	msgType = "chat"
 	if *flagChatroom {