From 7cd5b9a6e8c3e4e423d7d10533cc2f1e98a4eca8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Na=C3=AFm=20Favier?= <n@monade.li>
Date: Sat, 6 May 2023 16:50:08 +0200
Subject: [PATCH] lib/options: fix rendering of options with only a defaultText

Some options have their default value set in the `config` instead of
`default`, for example to push `mkDefault`s down an attribute set.
In those cases, it's useful to provide a `defaultText` for informational
purposes.
---
 lib/options.nix | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/options.nix b/lib/options.nix
index 4780a56fc1c3..d71d9421b7b1 100644
--- a/lib/options.nix
+++ b/lib/options.nix
@@ -261,7 +261,7 @@ rec {
     concatMap (opt:
       let
         name = showOption opt.loc;
-        docOption = rec {
+        docOption = {
           loc = opt.loc;
           inherit name;
           description = opt.description or null;
@@ -280,9 +280,9 @@ rec {
               renderOptionValue opt.example
             );
         }
-        // optionalAttrs (opt ? default) {
+        // optionalAttrs (opt ? defaultText || opt ? default) {
           default =
-            builtins.addErrorContext "while evaluating the default value of option `${name}`" (
+            builtins.addErrorContext "while evaluating the ${if opt?defaultText then "defaultText" else "default value"} of option `${name}`" (
               renderOptionValue (opt.defaultText or opt.default)
             );
         }