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

let
  inherit (pkgs.lib.fileset)
    fileFilter
    gitTrackedWith
    intersection
    toSource
    ;
in

{
  package = pkgs.buildNpmPackage {
    name = "metis";

    src = toSource {
      root = ./.;
      fileset = intersection (gitTrackedWith { } ./.) (
        fileFilter ({ name, hasExt, ... }: !(hasExt "nix") && name != "npins") ./.
      );
    };

    npmDepsHash = "sha256-RbjWNVY8KlPP9ajQRnrsWhOZiiyyMGQSY39lmZnTC1I=";

    installPhase = ''
      cp -r public $out
    '';
  };

  devShell = pkgs.mkShell {
    name = "metis.dev";

    packages = [ pkgs.nodejs ];
  };

  providers = {
    eleves-ens = "cloud.eleves.ens.fr";
    frama-agenda = "framagenda.org";
    dgnum-nc = "cloud.dgnum.eu";
  };
}