Handle color scheme changes in choose-files kitten

Author: kovidgoyal

kittens/choose_files/main.go

@@ -713,6 +713,7 @@ func (h *Handler) set_state_from_config(conf *Config, opts *Options) (err error)
 }
 
 var default_cwd string
+var use_light_colors bool
 
 func main(_ *cli.Command, opts *Options, args []string) (rc int, err error) {
 	write_output := func(selections []string, interrupted bool, current_filter string) {
@@ -763,6 +764,7 @@ func main(_ *cli.Command, opts *Options, args []string) (rc int, err error) {
 		return 1, err
 	}
 	lp.MouseTrackingMode(loop.FULL_MOUSE_TRACKING)
+	lp.ColorSchemeChangeNotifications()
 	handler := Handler{lp: lp, err_chan: make(chan error, 8), msg_printer: message.NewPrinter(utils.LanguageTag()), spinner: tui.NewSpinner("dots")}
 	handler.rl = readline.New(lp, readline.RlInit{
 		Prompt: "> ", ContinuationPrompt: ". ", Completer: handler.complete_save_prompt,
@@ -796,12 +798,22 @@ func main(_ *cli.Command, opts *Options, args []string) (rc int, err error) {
 		if opts.Title != "" {
 			lp.SetWindowTitle(opts.Title)
 		}
+		lp.RequestCurrentColorScheme()
 		return handler.OnInitialize()
 	}
 	lp.OnResize = func(old, new_size loop.ScreenSize) (err error) {
 		handler.init_sizes(new_size)
 		return handler.draw_screen()
 	}
+	lp.OnColorSchemeChange = func(p loop.ColorPreference) (err error) {
+		new_val := p == loop.LIGHT_COLOR_PREFERENCE
+		if new_val != use_light_colors {
+			use_light_colors = new_val
+			handler.preview_manager.invalidate_color_scheme_based_cached_items()
+			return handler.draw_screen()
+		}
+		return
+	}
 	lp.OnKeyEvent = handler.OnKeyEvent
 	lp.OnText = handler.OnText
 	lp.OnMouseEvent = handler.OnMouseEvent

kittens/choose_files/preview.go

@@ -3,6 +3,7 @@ package choose_files
 import (
 	"fmt"
 	"io/fs"
+	"maps"
 	"os"
 	"path/filepath"
 	"slices"
@@ -20,6 +21,7 @@ var _ = fmt.Print
 
 type Preview interface {
 	Render(h *Handler, x, y, width, height int)
+	IsValidForColorScheme(light bool) bool
 }
 
 type PreviewManager struct {
@@ -71,6 +73,8 @@ type MessagePreview struct {
 	trailers []string
 }
 
+func (p MessagePreview) IsValidForColorScheme(bool) bool { return true }
+
 func (p MessagePreview) Render(h *Handler, x, y, width, height int) {
 	offset := 0
 	if p.title != "" {
@@ -163,6 +167,12 @@ func NewFileMetadataPreview(abspath string, metadata fs.FileInfo) Preview {
 	return &MessagePreview{title: title, msg: h, trailers: t}
 }
 
+func (pm *PreviewManager) invalidate_color_scheme_based_cached_items() {
+	pm.lock.Lock()
+	defer pm.lock.Unlock()
+	maps.DeleteFunc(pm.cache, func(key string, p Preview) bool { return !p.IsValidForColorScheme(use_light_colors) })
+}
+
 func (pm *PreviewManager) preview_for(abspath string, ftype fs.FileMode) (ans Preview) {
 	if ans = pm.cached_preview(abspath); ans != nil {
 		return ans

tools/tui/loop/api.go

@@ -218,6 +218,10 @@ func NoFocusTracking(self *Loop) {
 	self.terminal_options.focus_tracking = false
 }
 
+func (self *Loop) RequestCurrentColorScheme() {
+	self.QueueWriteString("\x1b[?996n")
+}
+
 func (self *Loop) ColorSchemeChangeNotifications() *Loop {
 	self.terminal_options.color_scheme_change_notification = true
 	return self

tools/tui/loop/capabilities.go

@@ -14,6 +14,17 @@ const (
 	LIGHT_COLOR_PREFERENCE
 )
 
+func (c ColorPreference) String() string {
+	switch c {
+	case DARK_COLOR_PREFERENCE:
+		return "dark"
+	case LIGHT_COLOR_PREFERENCE:
+		return "light"
+	default:
+		return "no-preference"
+	}
+}
+
 type TerminalCapabilities struct {
 	KeyboardProtocol                 bool
 	KeyboardProtocolResponseReceived bool