{ findutils
, gnugrep
, coreutils
, writeShellScriptBin
, swww
, backgrounds_directory ? "$HOME/Immagini/Sfondi/1080+/1440+"
}: writeShellScriptBin "wl-update-background" ''
  set -e
  if [ $# -eq 0 ]; then
    image=`${findutils}/bin/find ${backgrounds_directory} -type f | ${gnugrep}/bin/grep -v "/\." | ${coreutils}/bin/shuf -n 1`
  else
    image="$1"
  fi
  echo "image: $image"
  ${swww}/bin/swww img "$image"
''