feat: query kitty keyboard at run

context.go

@@ -73,7 +73,7 @@ func newContext(ctx context.Context) *teaContext {
 	c := new(teaContext)
 	c.Context = ctx
 	c.values = make(map[interface{}]interface{})
-	// c.kittyFlags = -1
+	c.values[ContextKeyKittyFlags] = -1 // Assume no Kitty support by default
 	return c
 }
 

nil_renderer.go

@@ -25,3 +25,4 @@ func (n nilRenderer) bracketedPasteActive() bool { return false }
 func (n nilRenderer) setWindowTitle(_ string)    {}
 func (n nilRenderer) requestBackgroundColor()    {}
 func (n nilRenderer) requestDeviceAttributes()   {}
+func (n nilRenderer) requestKittyKeyboard()      {}

renderer.go

@@ -77,6 +77,10 @@ type renderer interface {
 	// requestDeviceAttributes requests the terminal to send its device
 	// attributes DA1.
 	requestDeviceAttributes()
+
+	// requestKittyKeyboard sends a request to the terminal to report
+	// kitty keyboard flags.
+	requestKittyKeyboard()
 }
 
 // repaintMsg forces a full repaint.

screen.go

@@ -17,6 +17,9 @@ type PasteMsg = input.PasteEvent
 // using RequestBackgroundColor Cmd.
 type BackgroundColorMsg = input.BackgroundColorEvent
 
+// KittyKeyboardMsg is used to report Kitty keyboard capabilities.
+type KittyKeyboardMsg = input.KittyKeyboardEvent
+
 // PrimaryDeviceAttributesMsg is used to report the terminal's primary device
 // attributes.
 type PrimaryDeviceAttributesMsg = input.PrimaryDeviceAttributesEvent

standard_renderer.go

@@ -470,6 +470,12 @@ func (r *standardRenderer) requestDeviceAttributes() {
 	r.execute(ansi.RequestPrimaryDeviceAttributes)
 }
 
+// requestKittyKeyboard sends a request to the terminal to report
+// keyboard events in the Kitty format.
+func (r *standardRenderer) requestKittyKeyboard() {
+	r.execute(ansi.RequestKittyKeyboard)
+}
+
 // setIgnoredLines specifies lines not to be touched by the standard Bubble Tea
 // renderer.
 func (r *standardRenderer) setIgnoredLines(from int, to int) {

tea.go

@@ -437,6 +437,8 @@ func (p *Program) handleContextMessages(msg Msg) {
 			_, _, l := col.Hsl()
 			p.ctx.hasLightBg = l > 0.5
 		}
+	case KittyKeyboardMsg:
+		p.ctx.SetValue(ContextKeyKittyFlags, int(msg))
 	}
 }
 
@@ -548,6 +550,7 @@ func (p *Program) Run() (Model, error) {
 
 	// Query terminal capabilities.
 	p.renderer.requestBackgroundColor()
+	p.renderer.requestKittyKeyboard()
 	p.renderer.requestDeviceAttributes()
 
 	// XXX: Here, we wait for a short period of time to receive terminal
@@ -571,6 +574,8 @@ EVENTS:
 			switch msg := msg.(type) {
 			case BackgroundColorMsg:
 				p.handleContextMessages(msg)
+			case KittyKeyboardMsg:
+				p.handleContextMessages(msg)
 			case PrimaryDeviceAttributesMsg:
 				break EVENTS
 			}