feat: store last window-size-msg in context

context.go

@@ -41,6 +41,9 @@ type Context interface {
 	// ColorProfile returns the terminal's color profile.
 	ColorProfile() lipgloss.Profile
 
+	// WindowSize returns the terminal's current size.
+	WindowSize() (width, height int)
+
 	// what else?
 }
 
@@ -55,6 +58,10 @@ var (
 	// ContextKeyKittyFlags is a key for storing the terminal's Kitty flags in a
 	// Context.
 	ContextKeyKittyFlags = &ContextKey{"kitty-flags"}
+
+	// ContextKeyWindowSize is a key for storing the terminal's window size in
+	// a Context.
+	ContextKeyWindowSize = &ContextKey{"window-size"}
 )
 
 type teaContext struct {
@@ -122,3 +129,10 @@ func (c *teaContext) NewStyle() (s lipgloss.Style) {
 func (c *teaContext) ColorProfile() lipgloss.Profile {
 	return c.profile
 }
+
+func (c *teaContext) WindowSize() (width, height int) {
+	if s, ok := c.Value(ContextKeyWindowSize).(WindowSizeMsg); ok {
+		return s.Width, s.Height
+	}
+	return 0, 0
+}

tea.go

@@ -337,6 +337,12 @@ func (p *Program) eventLoop(model Model, cmds chan Cmd) (Model, error) {
 			case QuitMsg:
 				return model, nil
 
+			case WindowSizeMsg:
+				p.ctx.SetValue(ContextKeyWindowSize, msg)
+
+			case KittyKeyboardMsg:
+				p.ctx.SetValue(ContextKeyKittyFlags, int(msg))
+
 			case BackgroundColorMsg:
 				p.handleContextMessages(msg)