Nix shell file to `pip install grip` so you don't have to pollute your global filesystem with python stuff

grip-shell.nix

{ pkgs ? import <nixpkgs> {} }:

pkgs.mkShell {
  buildInputs = [
    (pkgs.python3.withPackages (ps: [ ps.pip ]))
  ];

  shellHook = ''
    export VENV_DIR=$(mktemp -d)
    python -m venv $VENV_DIR
    source $VENV_DIR/bin/activate
    pip install grip
    echo "Virtual environment is ready and grip is installed."
  '';
}

Put this into a file called shell.nix directory with markdown files and run nix-shell, then you will have this package. When you exit, all python stuff will be gone, like it was just a bad dream.