appview: highlight linked lines

appview/pages/pages.go

···
 
 func (p *Pages) RepoBlob(w io.Writer, params RepoBlobParams) error {
 	var style *chroma.Style = styles.Get("catpuccin-latte")
-	b := style.Builder()
-	style, _ = b.Build()
 
 	if params.ShowRendered {
 		switch markup.GetFormat(params.Path) {

cmd/syntax/chroma.go

···
 	darkTheme  = "catppuccin-macchiato"
 )
 
+const (
+	targetHl = `
+	.chroma .line:has(.ln:target) {
+		background-color: rgba(140, 143, 161, 0.3);
+	}
+
+	@media (prefers-color-scheme: dark) {
+		.chroma .line:has(.ln:target) {
+			background-color: rgba(128, 135, 162, 0.3);
+		}
+	}
+	`
+)
+
 func main() {
 	outFile := flag.String("out", "", "css output file path")
 	flag.Parse()
···
 	file.WriteString("\n@media (prefers-color-scheme: dark) {\n")
 	formatter.WriteCSS(file, styles.Get(darkTheme))
 	file.WriteString("}\n")
+
+	file.WriteString(targetHl)
 }