*

.gitignore

@@ -1,2 +1,4 @@
 /nanite
 /exp/
+/.envrc
+/result

event.go

@@ -96,8 +96,10 @@ func (_ HangupEvent) HandleOutgoing(app *App) error {
 	app.conn.stop()
 	app.conn.Write([]byte("QUIT\n"))
 	app.conn.Close()
-	app.conn.ticker.Stop()
-	app.conn.ticker = nil
+	if app.conn.ticker != nil {
+		app.conn.ticker.Stop()
+		app.conn.ticker = nil
+	}
 	app.conn = nil
 	app.incoming <- HangupEvent{host, port}
 

main.go

@@ -102,6 +102,41 @@ func (app *App) EnsureConfigDir() error {
 	return nil
 }
 
+func (app *App) Error(err error) {
+	if app.conn != nil {
+		host := app.conn.host
+		port := app.conn.port
+		app.conn.stop()
+		app.conn.Close()
+		if app.conn.ticker != nil {
+			app.conn.ticker.Stop()
+		}
+		app.conn = nil
+		app.incoming <- SystemMessageEvent(fmt.Sprintf("disconnected from %s:%s: %v", host, port, err))
+	} else {
+		app.incoming <- SystemMessageEvent(fmt.Sprintf("error: %v", err))
+	}
+}
+
+func (app *App) Run() {
+	for {
+		select {
+		case ev := <-app.outgoing:
+			_, dial := ev.(DialEvent)
+			if dial || app.conn != nil {
+				if err := ev.HandleOutgoing(app); err != nil {
+					app.Error(err)
+					continue
+				}
+			} else {
+				app.incoming <- SystemMessageEvent("not connected to any server")
+			}
+		case <-app.ctx.Done():
+			return
+		}
+	}
+}
+
 func NewApp() *App {
 	app := &App{}
 	app.ctx, app.stop = context.WithCancel(context.Background())
@@ -117,25 +152,7 @@ func NewApp() *App {
 		panic(err)
 	}
 
-	go func() {
-		for {
-			select {
-			case ev := <-app.outgoing:
-				_, dial := ev.(DialEvent)
-				if dial || app.conn != nil {
-					if err := ev.HandleOutgoing(app); err != nil {
-						app.error <- err
-						return
-					}
-				} else {
-					app.incoming <- SystemMessageEvent("not connected to any server")
-				}
-			case <-app.ctx.Done():
-				return
-			}
-		}
-	}()
-
+	go app.Run()
 	app.InitUI()
 
 	return app

shell.nix

@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.go
+    pkgs.gopls
+  ];
+}