use_flake() {
  watch_file flake.nix
  watch_file flake.lock
  mkdir -p "$(direnv_layout_dir)"
  eval "$(time nix print-dev-env --show-trace --profile "$(direnv_layout_dir)"/flake-profile || echo false)" &&
  nix-store --add-root "shell.root" --indirect --realise "$(direnv_layout_dir)"/flake-profile
  rm -rf "$(direnv_layout_dir)"/flake-profile
}
use flake