fn.sopsHelper option argument can now be a function or a set.

fn.nix

@@ -58,8 +58,13 @@ rec {
     (p: true) (deps p)
   );
   sopsHelper = template: names: options: let
-    nameList = map template names;
-  in listToAttrs (map (nameEntry: {name = nameEntry; value = options;}) nameList);
+    optionsIsFunction = (typeOf options) == "lambda";
+  in listToAttrs (map
+    (name: {
+      name = template name;
+      value = ifelse optionsIsFunction (options name) options;
+    })
+    names);
   pkgFilter = ld: (filter
     (p: (
       ifelse (isBroken p)