More work on porting themes

tools/cmd/themes/list.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 
 	"kitty/tools/themes"
+	"kitty/tools/utils"
+	"kitty/tools/wcswidth"
 )
 
 var _ = fmt.Print
@@ -40,10 +42,58 @@ func (self *ThemesList) Next(delta int, allow_wrapping bool) bool {
 	return true
 }
 
+func limit_lengths(text string) string {
+	t, x := wcswidth.TruncateToVisualLengthWithWidth(text, 31)
+	if x >= len(text) {
+		return text
+	}
+	return t + "…"
+}
+
 func (self *ThemesList) UpdateThemes(themes *themes.Themes) {
 	self.themes, self.all_themes = themes, themes
 	if self.current_search != "" {
 		self.themes = self.all_themes.Copy()
+		self.display_strings = utils.Map(limit_lengths, self.themes.ApplySearch(self.current_search))
 	} else {
+		self.display_strings = utils.Map(limit_lengths, self.themes.Names())
 	}
+	self.widths = utils.Map(wcswidth.Stringwidth, self.display_strings)
+	self.max_width = utils.Max(0, self.widths...)
+	self.current_idx = 0
+}
+
+func (self *ThemesList) UpdateSearch(query string) bool {
+	if query == self.current_search || self.all_themes == nil {
+		return false
+	}
+	self.current_search = query
+	self.UpdateThemes(self.all_themes)
+	return true
+}
+
+type Line struct {
+	text       string
+	width      int
+	is_current bool
+}
+
+func (self *ThemesList) Lines(num_rows int) []Line {
+	if num_rows < 1 {
+		return nil
+	}
+	ans := make([]Line, 0, len(self.display_strings))
+	before_num := utils.Min(self.current_idx, num_rows-1)
+	start := self.current_idx - before_num
+	for i := start; i < utils.Min(start+num_rows, len(self.display_strings)); i++ {
+		ans = append(ans, Line{self.display_strings[i], self.widths[i], i == self.current_idx})
+	}
+	return ans
+}
+
+func (self *ThemesList) CurrentTheme() *themes.Theme {
+	if self.themes == nil {
+		return nil
+	}
+	return self.themes.At(self.current_idx)
 }