Modularize everything

modules/services/belgian-eid.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+with lib.my;
+
+let cfg = config.modules.services.belgian-eid;
+in {
+  options.modules.services.belgian-eid = { enable = mkBoolOpt false; };
+
+  config = mkIf cfg.enable {
+
+    nixpkgs.overlays = [
+      (final: prev: {
+        firefox = prev.firefox.override { pkcs11Modules = [ prev.eid-mw ]; };
+      })
+    ];
+
+    services.pcscd.enable = true;
+
+    environment.systemPackages = with pkgs.unstable; [ eid-mw ];
+  };
+}