shell.nix

let
  pkgSource = https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz;
  pkgTarball = fetchTarball pkgSource;
  pkgs = import pkgTarball {};
  pymacs = pkgs.python37.pkgs.buildPythonPackage rec {
    pname = "Pymacs";
    version = "0.25";

    src = pkgs.python37.pkgs.fetchPypi {
      inherit pname version;
      sha256 = "43c2c9e5e7a16b6c88ba3088a9bfc82f7db8e13378be7c78d6c14a5f8ed05afd";
    };

    doCheck = false;

    meta = with pkgs.python37.pkgs.lib; {
      homepage = https://github.com/bendikro/Pymacs;
      description = "Pymacs for Python 2 and 3";
    };
  };
  leo-python = pkgs.python37.withPackages(ps: with ps; [ pip pymacs ]);
in
pkgs.stdenv.mkDerivation {
 name = "leo";
 buildInputs = [ leo-python ];
}