Add fatal error when port is already in use

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

cmd/spilltea/main.go

@@ -137,17 +137,31 @@ func main() {
 		}
 		broker := intercept.NewBroker()
 		m := appUI.New(broker, project.Name, project.Path)
-		if _, err := tea.NewProgram(m).Run(); err != nil {
+		final, err := tea.NewProgram(m).Run()
+		if err != nil {
 			fmt.Fprintf(os.Stderr, "tui: %v\n", err)
 			os.Exit(1)
 		}
+		if app, ok := final.(appUI.Model); ok {
+			if ferr := app.FatalErr(); ferr != nil {
+				fmt.Fprintf(os.Stderr, "error: %v\n", ferr)
+				os.Exit(1)
+			}
+		}
 		return
 	}
 
 	// Run home + app in a single program to avoid a blank flash on transition.
 	root := rootModel{home: homeUI.New(projectDir)}
-	if _, err := tea.NewProgram(root).Run(); err != nil {
+	final, err := tea.NewProgram(root).Run()
+	if err != nil {
 		fmt.Fprintf(os.Stderr, "tui: %v\n", err)
 		os.Exit(1)
 	}
+	if r, ok := final.(rootModel); ok {
+		if ferr := r.FatalErr(); ferr != nil {
+			fmt.Fprintf(os.Stderr, "error: %v\n", ferr)
+			os.Exit(1)
+		}
+	}
 }

cmd/spilltea/root.go

@@ -58,3 +58,12 @@ func (m rootModel) View() tea.View {
 	}
 	return m.home.View()
 }
+
+func (m rootModel) FatalErr() error {
+	if m.state == rootStateApp {
+		if app, ok := m.app.(appUI.Model); ok {
+			return app.FatalErr()
+		}
+	}
+	return nil
+}

internal/ui/app/model.go

@@ -55,6 +55,7 @@ type Model struct {
 	database      *db.DB
 	logFile       *os.File
 	pluginManager *plugins.Manager
+	fatalErr      error
 
 	width         int
 	height        int
@@ -135,6 +136,8 @@ func New(broker *intercept.Broker, name, path string) Model {
 	return m
 }
 
+func (m Model) FatalErr() error { return m.fatalErr }
+
 func (m Model) Init() tea.Cmd {
 	mgr := m.pluginManager
 	return tea.Batch(

internal/ui/app/update.go

@@ -107,16 +107,8 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case proxyPkg.ErrMsg:
 		if msg.Err != nil {
 			log.Printf("proxy error: %v", msg.Err)
-			return m, tea.Batch(
+			m.fatalErr = msg.Err
-				func() tea.Msg {
+			return m, tea.Quit
-					return notificationsUI.NotificationMsg{
-						Title: "Proxy Error",
-						Body:  msg.Err.Error(),
-						Kind:  notificationsUI.KindError,
-					}
-				},
-				tea.Quit,
-			)
 		}
 		return m, nil