use_flake() {
  watch_file flake.nix
  watch_file flake.lock
  mkdir -p "$(direnv_layout_dir)"
  eval "$(nix print-dev-env --option allow-import-from-derivation true -L --show-trace --impure --profile "$(direnv_layout_dir)/flake-profile" || echo false)" &&
  nix-store --add-root "shell.root" \
   --indirect --realise "$(direnv_layout_dir)/flake-profile"
}
use flake