lupan-set-theme: toggle based on existence of ~/.lightmode, update dwm theme

xsession/bin/lupan-set-theme

@@ -2,24 +2,27 @@
 
 THEME="$1"
 
-XSET=$(readlink -e ~/.config/xsettingsd/xsettingsd.conf)
 if [ "$THEME" = "toggle" ]; then
-    if  grep Materia-dark "$XSET" > /dev/null; then
-        THEME=light
-    else
+    if [ -e ~/.lightmode ]; then
         THEME=dark
+    else
+        THEME=light
     fi
 fi
 
 if [ "$THEME" = dark ]; then
     GTK_THEME=Materia-dark
+    rm -f ~/.lightmode
 elif [ "$THEME" = light ]; then
     GTK_THEME=Materia-light
+    touch ~/.lightmode
 else
     echo "error: unknown theme: should be either dark, light or toggle" >&2
     exit 1
 fi
 
+killall -USR1 dwm
+
 XRES=$(readlink -e ~/.Xresources)
 if [ -n "$XRES" ]; then
     if [ "$THEME" = dark ]; then
@@ -41,6 +44,7 @@ if [ -f "$ATOML" ]; then
     sed -i "s#^import =.*#import = [\"~/.config/alacritty/$THEME.toml\"]#" "$ATOML"
 fi
 
+XSET=$(readlink -e ~/.config/xsettingsd/xsettingsd.conf)
 if [ "$THEME" = dark ]; then
     kitten themes --reload-in=all Afterglow
 elif [ "$THEME" = light ]; then