Added flag '-i' which makes go-sendxmpp work with 'tail -f'.

README.md

@@ -42,23 +42,25 @@ account details via command line options:
 ```plain
 ./go-sendxmpp --help
 Usage: go-sendxmpp [-cdtx] [-f value] [--help] [-j value] [-p value] [-r value] [-u value] [parameters ...]
- -c, --chatroom    Send message to a chatroom.
- -d, --debug       Show debugging info.
- -f, --file=value  Set configuration file. (Default: ~/.sendxmpprc)
-     --help        Show help.
+-c, --chatroom     Send message to a chatroom.
+ -d, --debug        Show debugging info.
+ -f, --file=value   Set configuration file. (Default: ~/.sendxmpprc)
+     --help         Show help.
+ -i, --interactive  Interactive mode (for use with e.g. 'tail -f').
  -j, --jserver=value
-                   XMPP server address.
+                    XMPP server address.
  -m, --message=value
-                   Set file including the message.
+                    Set file including the message.
  -p, --password=value
-                   Password for XMPP account.
+                    Password for XMPP account.
  -r, --resource=value
-                   Set resource. When sending to a chatroom this is used as
-                   'alias'. (Default: go-sendxmpp)
- -t, --tls         Use TLS.
+                    Set resource. When sending to a chatroom this is used as
+                    'alias'. (Default: go-sendxmpp)
+ -t, --tls          Use TLS.
  -u, --username=value
-                   Username for XMPP account.
- -x, --start-tls   Use StartTLS.
+                    Username for XMPP account.
+ -x, --start-tls    Use StartTLS.
+
 ```
 
 ### examples
@@ -79,4 +81,10 @@ Send a message to two groupchats (`-c`) using a configuration file.
 
 ```bash
 cat message.txt | ./go-sendxmpp -cf ./sendxmpp chat1@conference.example.com chat2@conference.example.com
+```
+
+Send file changes to two groupchats (`-c`) using a configuration file.
+
+```bash
+tail -f example.log | ./go-sendxmpp -cif ./sendxmpp chat1@conference.example.com chat2@conference.example.com
 ```

go-sendxmpp.go

@@ -189,6 +189,7 @@ func main() {
 		"When sending to a chatroom this is used as 'alias'. (Default: go-sendxmpp)")
 	flagFile := getopt.StringLong("file", 'f', "", "Set configuration file. (Default: ~/.sendxmpprc)")
 	flagMessageFile := getopt.StringLong("message", 'm', "", "Set file including the message.")
+	flagInteractive := getopt.BoolLong("interactive", 'i', "Interactive mode (for use with e.g. 'tail -f').")
 
 	// Parse command line flags.
 	getopt.Parse()
@@ -273,21 +274,24 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if message == "" {
+	// Skip reading message if '-i' or '--interactive' is set to work with e.g. 'tail -f'.
+	if *flagInteractive == false {
+		if message == "" {
 
-		scanner := bufio.NewScanner(os.Stdin)
-		for scanner.Scan() {
+			scanner := bufio.NewScanner(os.Stdin)
+			for scanner.Scan() {
 
-			if message == "" {
-				message = scanner.Text()
-			} else {
-				message = message + "\n" + scanner.Text()
+				if message == "" {
+					message = scanner.Text()
+				} else {
+					message = message + "\n" + scanner.Text()
+				}
 			}
-		}
 
-		if err := scanner.Err(); err != nil {
-			if err != io.EOF {
-				log.Fatal(err)
+			if err := scanner.Err(); err != nil {
+				if err != io.EOF {
+					log.Fatal(err)
+				}
 			}
 		}
 	}
@@ -307,13 +311,32 @@ func main() {
 			if mucStatus > 300 {
 				log.Fatal("Couldn't join MUC. Status:", mucStatus)
 			}
+		}
 
+		// Send in endless loop (for usage with e.g. "tail -f").
+		if *flagInteractive == true {
+			for {
+				scanner := bufio.NewScanner(os.Stdin)
+				scanner.Scan()
+				message = scanner.Text()
+				for _, recipient := range recipients {
+					_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "groupchat", Text: message})
+					if err != nil {
+						log.Fatal(err)
+					}
+				}
+			}
+		} else {
 			// Send the message.
-			_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "groupchat", Text: message})
-			if err != nil {
-				log.Fatal(err)
+			for _, recipient := range recipients {
+				_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "groupchat", Text: message})
+				if err != nil {
+					log.Fatal(err)
+				}
 			}
+		}
 
+		for _, recipient := range recipients {
 			// After sending the message, leave the Muc
 			_, err = client.LeaveMUC(recipient)
 			if err != nil {
@@ -321,15 +344,30 @@ func main() {
 			}
 		}
 	} else {
+		// If the chatroom flag is not set, send message to contact(s).
 
-		for _, recipient := range recipients {
-
-			// If the chatroom flag is not set, send message to contact(s).
-			_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "chat", Text: message})
-			if err != nil {
-				log.Fatal(err)
+		// Send in endless loop (for usage with e.g. "tail -f").
+		if *flagInteractive == true {
+			for {
+				scanner := bufio.NewScanner(os.Stdin)
+				scanner.Scan()
+				message = scanner.Text()
+				for _, recipient := range recipients {
+					_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "chat", Text: message})
+					if err != nil {
+						log.Fatal(err)
+					}
+				}
+			}
+		} else {
+			for _, recipient := range recipients {
+				_, err = client.Send(xmpp.Chat{Remote: recipient, Type: "chat", Text: message})
+				if err != nil {
+					log.Fatal(err)
+				}
 			}
 		}
 	}
+
 	time.Sleep(1 * time.Second)
 }