flake.nix

{
  description = "Minimal Python + Textual dev shell (all systems)";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        py = pkgs.python3;
      in
      {
        devShells.default = pkgs.mkShell {
          packages = [
            (py.withPackages (ps: [
              ps.textual
              ps.sh
            ]))
          ];
        };
      }
    );
}