Option to turn off clear of the web terminal buffer when session is closed

frontend/templates/tty-receiver.in.html

@@ -12,7 +12,8 @@
                 sessionID: {{.SessionID}},
                 salt: {{.Salt}},
                 wsPath: {{.WSPath}},
-                scrollBack: {{.ScrollBack}}
+                scrollBack: {{.ScrollBack}},
+                noClear: {{.NoClear}}
             }
             console.log("Initial data", window.ttyInitialData)
         </script>

frontend/tty-receiver/main.ts

@@ -28,5 +28,6 @@ wsAddress += ttyWindow.location.host + ttyWindow.ttyInitialData.wsPath;
 const ttyReceiver = new TTYReceiver(
     wsAddress, 
     document.getElementById('terminal') as HTMLDivElement, 
-    ttyWindow.ttyInitialData.scrollBack
+    ttyWindow.ttyInitialData.scrollBack,
+    !ttyWindow.ttyInitialData.noClear
 );

frontend/tty-receiver/tty-receiver.ts

@@ -11,7 +11,7 @@ class TTYReceiver {
     private xterminal: Terminal;
     private containerElement: HTMLElement;
 
-    constructor(wsAddress: string, container: HTMLDivElement, scrollback: number) {
+    constructor(wsAddress: string, container: HTMLDivElement, scrollback: number, clear: boolean) {
         const connection = new WebSocket(wsAddress);
 
         this.xterminal = new Terminal({
@@ -29,7 +29,9 @@ class TTYReceiver {
 
            this.xterminal.blur();
            this.xterminal.setOption('cursorBlink', false);
-           this.xterminal.clear();
+           if (clear) {
+              this.xterminal.clear();
+           }
            this.xterminal.write('Session closed');
         }
 

server.go

@@ -28,6 +28,7 @@ type SessionTemplateModel struct {
 	Salt       string
 	WSPath     string
 	ScrollBack int
+	NoClear    bool
 }
 
 // TTYServerConfig is used to configure the tty server before it is started
@@ -40,6 +41,7 @@ type TTYServerConfig struct {
 	TLSKeyFile   string
 	FrontendPath string
 	ScrollBack   int
+	NoClear      bool
 }
 
 // TTYServer represents the instance of a tty server
@@ -192,6 +194,7 @@ func (server *TTYServer) handleSession(w http.ResponseWriter, r *http.Request) {
 		Salt:       "salt&pepper",
 		WSPath:     getWSPath(sessionID),
 		ScrollBack: server.config.ScrollBack,
+		NoClear:    server.config.NoClear,
 	}
 	err = t.Execute(w, templateModel)
 

server_main.go

@@ -17,6 +17,7 @@ func main() {
 	url := flag.String("url", "http://localhost", "The public web URL the server will be accessible at. This will be sent back to the tty-share tool to display it to the user.")
 	frontendPath := flag.String("frontend_path", "", "The path to the frontend resources. By default, these resources are included in the server binary, so you only need this path if you don't want to use the bundled ones.")
 	scrollBack := flag.Int("scroll_back", 1024, "Set scrollback buffer size for viewers")
+	noClear := flag.Bool("noclear", false, "Don't clear web terminal buffer when session is closed")
 	flag.Parse()
 
 	log := MainLogger
@@ -28,6 +29,7 @@ func main() {
 		ServerURL:        *url,
 		FrontendPath:     *frontendPath,
 		ScrollBack:       *scrollBack,
+		NoClear:          *noClear,
 	}
 
 	server := NewTTYServer(config)