fix(anki): make sops optional for standalone home-manager

home/modules/anki.nix

@@ -1,6 +1,23 @@
-{ config, pkgs, ... }:
-
 {
+  config,
+  lib,
+  pkgs,
+  osConfig ? null,
+  ...
+}:
+
+let
+  hmSopsAvailable = config ? sops && config.sops ? secrets;
+  osSopsAvailable = osConfig != null && osConfig ? sops && osConfig.sops ? secrets;
+  sopsAvailable = hmSopsAvailable || osSopsAvailable;
+
+  sopsSecrets = if hmSopsAvailable then config.sops.secrets else osConfig.sops.secrets;
+in
+{
+  warnings = lib.optional (
+    !sopsAvailable && config.programs.anki.enable
+  ) "anki is enabled but sops secrets are not available. anki sync will not be configured.";
+
   programs.anki = {
     enable = true;
     addons = with pkgs.ankiAddons; [
@@ -8,9 +25,9 @@
       puppy-reinforcement
       review-heatmap
     ];
-    sync = {
+    sync = lib.mkIf sopsAvailable {
-      usernameFile = "${config.sops.secrets."anki_sync_user".path}";
+      usernameFile = "${sopsSecrets."anki_sync_user".path}";
-      keyFile = "${config.sops.secrets."anki_sync_key".path}";
+      keyFile = "${sopsSecrets."anki_sync_key".path}";
     };
   };
 }