{
  sources ? import ./npins,
  pkgs ? import sources.nixpkgs { },
}:

let
  nix-pkgs = import sources.nix-pkgs { inherit pkgs; };

  python3 = pkgs.python3.override {
    packageOverrides = _: _: {
      inherit (nix-pkgs)
        django-background-tasks
        django-browser-reload
        django-bulma-forms
        django-translated-fields
        loadcredential
        ;

      authens = nix-pkgs.authens.overridePythonAttrs (old: {
        patches = [ ./01-authens.patch ];
      });
    };
  };
in

{
  devShell = pkgs.mkShell {
    name = "cas-eleves.dev";

    packages = [
      (python3.withPackages (ps: [
        ps.django
        ps.ipython
        ps.django-stubs

        ps.markdown
        ps.numpy
        ps.networkx

        ps.authens
        ps.django-background-tasks
        ps.django-browser-reload
        ps.django-bulma-forms
        ps.django-debug-toolbar
        ps.django-translated-fields
        ps.loadcredential
      ]))

      pkgs.gettext
      pkgs.gtranslator
    ];

    env = {
      CREDENTIALS_DIRECTORY = builtins.toString ./.credentials;
      KADENIOS_DEBUG = "true";
      KADENIOS_STATIC_ROOT = builtins.toString ./.static;
    };

    shellHook = ''
      if [ ! -d .static ]; then
        mkdir .static
      fi
    '';
  };
}