waybar: toggle light and dark theme

xsession/bin/lupan-set-theme

@@ -33,3 +33,8 @@ if [ -f ~/.config/xsettingsd/xsettingsd.conf ]; then
     pkill -HUP -x xsettingsd
     gsettings set org.gnome.desktop.interface gtk-theme "${GTK_THEME}"
 fi
+
+# waybar
+if [ -f ~/.config/waybar/style.css ]; then
+    sed -i -E "s#file:///.*/(light|dark)[.]css#file://$HOME/.config/waybar/$THEME.css#" ~/.config/waybar/style.css
+fi