Work on supporting mouse interactions via simple hyperlinks

tools/cmd/list_fonts/main.go

@@ -70,6 +70,7 @@ func main() (rc int, err error) {
 		lp.SetCursorVisible(true)
 		return ``
 	}
+	lp.OnMouseEvent = h.on_mouse_event
 	lp.OnResize = func(_, _ loop.ScreenSize) error {
 		return h.draw_screen()
 	}

tools/cmd/list_fonts/ui.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 	"sync"
 
+	"kitty/tools/tui"
 	"kitty/tools/tui/loop"
 	"kitty/tools/tui/readline"
 	"kitty/tools/utils"
@@ -30,6 +31,7 @@ type handler struct {
 	state                State
 	err_mutex            sync.Mutex
 	err_in_worker_thread error
+	mouse_state          tui.MouseState
 
 	// Listing
 	rl                          *readline.Readline
@@ -278,6 +280,10 @@ func (h *handler) on_wakeup() (err error) {
 	return h.draw_screen()
 }
 
+func (h *handler) on_mouse_event(event *loop.MouseEvent) (err error) {
+	return h.mouse_state.UpdateState(event)
+}
+
 func (h *handler) on_key_event(event *loop.KeyEvent) (err error) {
 	if event.MatchesPressOrRepeat("ctrl+c") {
 		event.Handled = true