Improve randomwp

home/scripts/randomwp.sh

@@ -10,7 +10,16 @@ if ! [ -d "$WALLPAPER_DIR" ]; then
     exit 1
 fi
 
+if [ "$#" -eq 1 ]; then
+    wallpaper_path="$1"
+    ext=$(file --extension "$wallpaper_path" | cut -d" " -f2)
+    if ! [ "$ext" == "png" ]; then
+        echo "$wallpaper_path is an invalid wallpaper"
+    fi
+else
     wallpaper_path=$(find "$WALLPAPER_DIR" -mindepth 1 | grep png| sort -R | tail -n 1)
+fi
+
 
 if [ -z "$wallpaper_path" ]; then
     echo "Unable to find wallpaper"