From 43ce0d77dbc4db5b0e6807f66349c940cd80bfdf Mon Sep 17 00:00:00 2001
From: Pedro Alves <pta2002@pta2002.com>
Date: Wed, 10 Feb 2021 21:03:30 +0000
Subject: [PATCH] helpers: add a helper for creating options

---
 plugins/helpers.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/plugins/helpers.nix b/plugins/helpers.nix
index c2a54dd5..eb505cb9 100644
--- a/plugins/helpers.nix
+++ b/plugins/helpers.nix
@@ -51,4 +51,11 @@ rec {
       key = key;
       mode = mode;
     }) normalized);
+
+  # Creates an option with a nullable type that defaults to null.
+  nullOrOption = type: desc: lib.mkOption {
+    type = lib.types.nullOr type;
+    default = null;
+    description = desc;
+  };
 }