Init function can return an error.

ui/control.go

@@ -24,5 +24,5 @@ type Control interface {
 type RootControl interface {
 	Control
 
-	Init(Context)
+	Init(Context) error
 }

ui/ui.go

@@ -16,7 +16,10 @@ func RunWait(r Renderer, s *Style, view Control, wait bool) error {
 	ctx := &context{r: r, style: s, view: view, ims: NewImages(r)}
 	root, ok := view.(RootControl)
 	if ok {
-		root.Init(ctx)
+		err := root.Init(ctx)
+		if err != nil {
+			return err
+		}
 	}
 	anim := time.NewTicker(30 * time.Millisecond)
 	go func() {