wip: figuring it out, slowly

modules/lib.nix

@@ -0,0 +1,58 @@
+{ pkgs }:
+{
+  appOptions = opts: with pkgs.lib; {
+      enable = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable";
+      };
+
+      autoSync = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Auto sync";
+      };
+
+      prune = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Prune";
+      };
+
+      serverSideDiff = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable server-side diffing";
+      };
+
+      values = mkOption {
+        type = types.attrsOf types.anything;
+        default = {};
+        description = "Values";
+      };
+    } // opts;
+
+  appConfig = cfg: name: conf:
+    with pkgs.lib;
+    let
+       app = conf // {
+         createNamespace = true;
+
+         compareOptions = {
+           serverSideDiff = cfg.serverSideDiff;
+          };
+
+         syncPolicy = {
+           syncOptions = {
+             applyOutOfSyncOnly = true;
+           };
+
+           autoSync = mkIf cfg.autoSync {
+             prune = cfg.prune;
+             selfHeal = false;
+           };
+         };
+       };
+
+    in mkIf cfg.enable { applications.${name} = app; };
+}