Code clean up.

The switch/case conditions should be easier to read then
a lot of nested if/else clauses.

main.go

@@ -117,22 +117,21 @@ func main() {
 	// Parse command line flags.
 	getopt.Parse()
 
-	// If requested, show help and quit.
-	if *flagHelp {
+	switch {
+	case *flagHelp:
+		// If requested, show help and quit.
 		getopt.Usage()
 		os.Exit(0)
-	}
 
-	// If requested, show version and quit.
-	if *flagVersion {
+	case *flagVersion:
+		// If requested, show version and quit.
 		fmt.Println("go-sendxmpp", VERSION)
 		fmt.Println("License: BSD-2-clause")
 		os.Exit(0)
-	}
 
-	// Quit if Ox (OpenPGP for XMPP) is requested for unsupported operations like
-	// groupchat, http-upload or listening.
-	if *flagOx && (*flagHttpUpload != "" || *flagChatroom || *flagListen) {
+	case *flagOx:
+		// Quit if Ox (OpenPGP for XMPP) is requested for unsupported operations like
+		// groupchat, http-upload or listening.
 		switch {
 		case *flagHttpUpload != "":
 			log.Fatal("No Ox support for http-upload available.")
@@ -280,7 +279,8 @@ func main() {
 		recipients[i].Jid = validatedJid
 	}
 
-	if *flagOxGenPrivKey {
+	switch {
+	case *flagOxGenPrivKey:
 		validatedOwnJid, err := MarshalJID(user)
 		if err != nil {
 			log.Fatal(err)
@@ -290,9 +290,8 @@ func main() {
 			log.Fatal(err)
 		}
 		os.Exit(0)
-	}
 
-	if *flagOxImportPrivKey != "" {
+	case *flagOxImportPrivKey != "":
 		validatedOwnJid, err := MarshalJID(user)
 		if err != nil {
 			log.Fatal(err)
@@ -351,8 +350,9 @@ func main() {
 	reg := regexp.MustCompile(`[\x{0000}-\x{0008}\x{000B}\x{000C}\x{000E}-\x{001F}]`)
 	message = reg.ReplaceAllString(message, "")
 
+	switch {
 	// Send raw XML to chatroom
-	if *flagChatroom && *flagRaw {
+	case *flagChatroom && *flagRaw:
 		var err error
 		// Join the MUCs.
 		for _, recipient := range recipients {
@@ -389,9 +389,8 @@ func main() {
 		// if the connection is closed immediately after sending a message.
 		time.Sleep(100 * time.Millisecond)
 		return
-	}
 
-	if *flagListen {
+	case *flagListen:
 		for {
 			received, err := client.Recv()
 			if err != nil {
@@ -419,10 +418,9 @@ func main() {
 				continue
 			}
 		}
-	}
 
-	// Send message to chatroom(s) if the flag is set.
-	if *flagChatroom {
+	case *flagChatroom:
+		// Send message to chatroom(s) if the flag is set.
 
 		for _, recipient := range recipients {
 
@@ -442,8 +440,9 @@ func main() {
 			}
 		}
 
-		// Send in endless loop (for usage with e.g. "tail -f").
-		if *flagInteractive {
+		switch {
+		case *flagInteractive:
+			// Send in endless loop (for usage with e.g. "tail -f").
 			for {
 				scanner := bufio.NewScanner(os.Stdin)
 				scanner.Scan()
@@ -459,7 +458,7 @@ func main() {
 					}
 				}
 			}
-		} else {
+		default:
 			// Send the message.
 			for _, recipient := range recipients {
 				if *flagHttpUpload != "" {
@@ -476,90 +475,91 @@ func main() {
 					log.Fatal(err)
 				}
 			}
-		}
 
-		for _, recipient := range recipients {
-			// After sending the message, leave the Muc
-			_, err = client.LeaveMUC(recipient.Jid)
-			if err != nil {
-				log.Println(err)
+			for _, recipient := range recipients {
+				// After sending the message, leave the Muc
+				_, err = client.LeaveMUC(recipient.Jid)
+				if err != nil {
+					log.Println(err)
+				}
 			}
 		}
-	} else {
+	case *flagRaw:
 		// Send raw XML
-		if *flagRaw {
-			_, err = client.SendOrg(message)
-			if err != nil {
-				// Try to nicely close connection,
-				// even if there was an error sending.
-				_ = client.Close()
-				log.Fatal(err)
-			}
-			// Wait for a short time as some messages are not delievered by the server
-			// if the connection is closed immediately after sending a message.
-			time.Sleep(100 * time.Millisecond)
-			return
+		_, err = client.SendOrg(message)
+		if err != nil {
+			// Try to nicely close connection,
+			// even if there was an error sending.
+			_ = client.Close()
+			log.Fatal(err)
 		}
+		// Wait for a short time as some messages are not delievered by the server
+		// if the connection is closed immediately after sending a message.
+		time.Sleep(100 * time.Millisecond)
+		return
 
+	case *flagInteractive:
 		// Send in endless loop (for usage with e.g. "tail -f").
-		if *flagInteractive {
-			for {
-				scanner := bufio.NewScanner(os.Stdin)
-				scanner.Scan()
-				message = scanner.Text()
-				for _, recipient := range recipients {
-					if *flagOx {
-						if recipient.OxKeyRing == nil {
-							continue
-						}
-						oxMessage, err := oxEncrypt(client, oxPrivKey,
-							recipient.Jid, recipient.OxKeyRing, message)
-						if err != nil {
-							fmt.Println("Ox: couldn't encrypt to",
-								recipient.Jid)
-							continue
-						}
-						_, err = client.SendOrg(oxMessage)
-						if err != nil {
-							log.Fatal(err)
-						}
-					} else {
-						_, err = client.Send(xmpp.Chat{Remote: recipient.Jid,
-							Type: "chat", Text: message})
-						if err != nil {
-							// Try to nicely close connection,
-							// even if there was an error sending.
-							_ = client.Close()
-							log.Fatal(err)
-						}
-					}
-				}
-			}
-		} else {
+		for {
+			scanner := bufio.NewScanner(os.Stdin)
+			scanner.Scan()
+			message = scanner.Text()
 			for _, recipient := range recipients {
-				if *flagHttpUpload != "" {
+				switch {
+				case *flagOx:
+					if recipient.OxKeyRing == nil {
+						continue
+					}
+					oxMessage, err := oxEncrypt(client, oxPrivKey,
+						recipient.Jid, recipient.OxKeyRing, message)
+					if err != nil {
+						fmt.Println("Ox: couldn't encrypt to",
+							recipient.Jid)
+						continue
+					}
+					_, err = client.SendOrg(oxMessage)
+					if err != nil {
+						log.Fatal(err)
+					}
+				default:
 					_, err = client.Send(xmpp.Chat{Remote: recipient.Jid,
-						Type: "chat", Ooburl: message, Text: message})
-				} else {
-					if *flagOx {
-						if recipient.OxKeyRing == nil {
-							continue
-						}
-						oxMessage, err := oxEncrypt(client, oxPrivKey,
-							recipient.Jid, recipient.OxKeyRing, message)
-						if err != nil {
-							fmt.Println("Ox: couldn't encrypt to", recipient.Jid)
-							continue
-						}
-						_, err = client.SendOrg(oxMessage)
-						if err != nil {
-							log.Fatal(err)
-						}
-					} else {
-						_, err = client.Send(xmpp.Chat{Remote: recipient.Jid,
-							Type: "chat", Text: message})
+						Type: "chat", Text: message})
+					if err != nil {
+						// Try to nicely close connection,
+						// even if there was an error sending.
+						_ = client.Close()
+						log.Fatal(err)
 					}
 				}
+			}
+		}
+	default:
+		for _, recipient := range recipients {
+			switch {
+			case *flagHttpUpload != "":
+				_, err = client.Send(xmpp.Chat{Remote: recipient.Jid,
+					Type: "chat", Ooburl: message, Text: message})
+				if err != nil {
+					fmt.Println("Couldn't send message to",
+						recipient.Jid)
+				}
+			case *flagOx:
+				if recipient.OxKeyRing == nil {
+					continue
+				}
+				oxMessage, err := oxEncrypt(client, oxPrivKey,
+					recipient.Jid, recipient.OxKeyRing, message)
+				if err != nil {
+					fmt.Println("Ox: couldn't encrypt to", recipient.Jid)
+					continue
+				}
+				_, err = client.SendOrg(oxMessage)
+				if err != nil {
+					log.Fatal(err)
+				}
+			default:
+				_, err = client.Send(xmpp.Chat{Remote: recipient.Jid,
+					Type: "chat", Text: message})
 				if err != nil {
 					// Try to nicely close connection,
 					// even if there was an error sending.