one more i/o fix in door handler - prompt doesn't always have a newline

main.go

@@ -266,12 +266,6 @@ func doorHandler(ctx context.Context, c net.Conn, w *gaio.Watcher, menuwg *sync.
 	defer menuwg.Done()
 
 	var wg sync.WaitGroup
-	const bannerText = "\r\nCOLOSSAL CAVE\r\n\r\n"
-
-	err := w.Write(ctx, c, []byte(bannerText))
-	if err != nil {
-		log.Printf("error writing to connection: %v\n", err)
-	}
 
 	var inChan, _ chan gaio.OpResult
 	var ok bool
@@ -354,10 +348,13 @@ func doorHandler(ctx context.Context, c net.Conn, w *gaio.Watcher, menuwg *sync.
 					if l > 0 {
 						w.Write(ctx, c, outBuf[:l])
 						log.Printf("wrote %d bytes to watcher: %v\n", l, string(outBuf[:l]))
-						waitingForInput = true
+						if strings.Contains(string(outBuf[:l]), ">") {
+							// a prompt appeared!
+							waitingForInput = true
+						}
 					} else {
 						// zero output? let's get some input?
-						waitingForInput = true
+						//						waitingForInput = true
 						w.Read(ctx, c, nil)
 					}
 				}