More work on porting themes UI to Go

tools/cmd/themes/ui.go

@@ -0,0 +1,84 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package themes
+
+import (
+	"fmt"
+	"io"
+	"kitty/tools/themes"
+	"kitty/tools/tui/loop"
+	"time"
+)
+
+var _ = fmt.Print
+
+type State int
+
+const (
+	FETCHING State = iota
+	BROWSING
+	SEARCHING
+	ACCEPTING
+)
+
+type CachedData struct {
+	Recent   []string `json:"recent"`
+	Category string   `json:"category"`
+}
+
+type fetch_data struct {
+	themes *themes.Themes
+	err    error
+	closer io.Closer
+}
+
+type handler struct {
+	lp          *loop.Loop
+	opts        *Options
+	cached_data *CachedData
+
+	state         State
+	fetch_result  chan fetch_data
+	all_themes    *themes.Themes
+	themes_closer io.Closer
+}
+
+func (self *handler) fetch_themes() {
+	r := fetch_data{}
+	r.themes, r.closer, r.err = themes.LoadThemes(time.Duration(self.opts.CacheAge * float64(time.Hour*24)))
+	self.lp.WakeupMainThread()
+	self.fetch_result <- r
+}
+
+func (self *handler) on_wakeup() error {
+	r := <-self.fetch_result
+	if r.err != nil {
+		return r.err
+	}
+	self.state = BROWSING
+	self.all_themes = r.themes
+	self.themes_closer = r.closer
+	self.redraw_after_category_change()
+	return nil
+}
+
+func (self *handler) finalize() {
+	t := self.themes_closer
+	if t != nil {
+		t.Close()
+	}
+}
+
+func (self *handler) initialize() {
+	self.fetch_result = make(chan fetch_data)
+	go self.fetch_themes()
+	self.draw_screen()
+}
+
+func (self *handler) draw_screen() {
+	// TODO: Implement me
+}
+
+func (self *handler) redraw_after_category_change() {
+	// TODO: Implement me
+}