ui: cleanup internals and api

Now that tcell events are handled in a goroutine, no need for a channel
to buffer them.

Rename ui.Tick() to ui.Render() and ui.Run() to ui.ProcessEvents() to
better reflect what these functions do.

Move screen.PollEvent() into ui.ProcessEvents(). Register the panic
handler in ui.ProcessEvents().

Remove aerc.ui.Tick() from DecryptKeys(). What the hell was that?

Signed-off-by: Robin Jarry <robin@jarry.cc>
Tested-by: Tim Culverhouse <tim@timculverhouse.com>

aerc.go

@@ -241,12 +241,12 @@ func main() {
 		setWindowTitle()
 	}
 
-	go ui.Run()
+	go ui.ProcessEvents()
 	for !ui.ShouldExit() {
 		for aerc.Tick() {
 			// Continue updating our internal state
 		}
-		if !ui.Tick() {
+		if !ui.Render() {
 			// ~60 FPS
 			time.Sleep(16 * time.Millisecond)
 		}

lib/ui/ui.go

@@ -13,9 +13,7 @@ type UI struct {
 	ctx     *Context
 	screen  tcell.Screen
 	popover *Popover
-
-	tcEvents chan tcell.Event
-	invalid  int32 // access via atomic
+	invalid int32 // access via atomic
 }
 
 func Initialize(content DrawableInteractive) (*UI, error) {
@@ -36,19 +34,10 @@ func Initialize(content DrawableInteractive) (*UI, error) {
 	state := UI{
 		Content: content,
 		screen:  screen,
-
-		tcEvents: make(chan tcell.Event, 10),
 	}
 	state.ctx = NewContext(width, height, screen, state.onPopover)
 
 	state.exit.Store(false)
-	go func() {
-		defer logging.PanicHandler()
-
-		for !state.ShouldExit() {
-			state.tcEvents <- screen.PollEvent()
-		}
-	}()
 
 	state.invalid = 1
 	content.OnInvalidate(func(_ Drawable) {
@@ -82,7 +71,7 @@ func (state *UI) Close() {
 	state.screen.Fini()
 }
 
-func (state *UI) Tick() bool {
+func (state *UI) Render() bool {
 	more := false
 
 	wasInvalid := atomic.SwapInt32(&state.invalid, 0)
@@ -110,8 +99,11 @@ func (state *UI) EnableMouse() {
 	state.screen.EnableMouse()
 }
 
-func (state *UI) Run() {
-	for event := range state.tcEvents {
+func (state *UI) ProcessEvents() {
+	defer logging.PanicHandler()
+
+	for !state.ShouldExit() {
+		event := state.screen.PollEvent()
 		if event, ok := event.(*tcell.EventResize); ok {
 			state.screen.Clear()
 			width, height := event.Size()

widgets/aerc.go

@@ -743,18 +743,13 @@ func (aerc *Aerc) DecryptKeys(keys []openpgp.Key, symmetric bool) (b []byte, err
 			fmt.Sprintf("Enter password for %s (%8X)\nPress <ESC> to cancel",
 				ident.Name, key.PublicKey.KeyId))
 
-		for {
-			select {
-			case err = <-chErr:
-				if err != nil {
-					return nil, err
-				}
-				pass := <-chPass
-				err = key.PrivateKey.Decrypt([]byte(pass))
+		for err := range chErr {
+			if err != nil {
 				return nil, err
-			default:
-				aerc.ui.Tick()
 			}
+			pass := <-chPass
+			err = key.PrivateKey.Decrypt([]byte(pass))
+			return nil, err
 		}
 	}
 	return nil, err