change the wallpaper-changer script to use a pid file

dotfiles/hypr-lap/wallpaper.sh

@@ -1,6 +1,17 @@
 #!/usr/bin/env bash
 
 Wallpaper_DIR="/home/smayzy/wallpaper"
+LOCKFILE="/tmp/wallpaper_changer.lock"
+
+if [ -f "$LOCKFILE" ]; then
+    old_pid=$(cat "$LOCKFILE")
+    if ps -p "$old_pid" > /dev/null 2>&1; then
+        kill "$old_pid"
+        sleep 1
+    fi
+fi
+
+echo $$ > "$LOCKFILE"
 
 set_wallpaper() {
     local Wallpaper=$(find $Wallpaper_DIR | shuf -n 1)
@@ -10,11 +21,12 @@ set_wallpaper() {
     echo "preload = $Wallpaper" >> /home/smayzy/.config/hypr/hyprpaper.conf
     echo "wallpaper = ,$Wallpaper" >> /home/smayzy/.config/hypr/hyprpaper.conf
 
-    # Restart hyprpaper
     pkill hyprpaper 2>/dev/null
     hyprpaper &
 }
 
+trap "rm -f $LOCKFILE" EXIT
+
 while true; do
     set_wallpaper
     sleep 600