lib/helpers: add defaultNullOpts.mkLogLevel

lib/helpers.nix

@@ -193,6 +193,37 @@ with lib; rec {
           else ''
             ${desc}
 
+            ${defaultDesc}
+          '';
+      };
+    mkLogLevel = default: desc:
+      mkOption {
+        type = with types;
+          nullOr
+          (
+            either ints.unsigned
+            (
+              enum
+              ["off" "error" "warn" "info" "debug" "trace"]
+            )
+          );
+        default = null;
+        apply =
+          mapNullable
+          (
+            value:
+              if isInt value
+              then value
+              else mkRaw "vim.log.levels.${strings.toUpper value}"
+          );
+        description = let
+          defaultDesc = "default: `${toString default}`";
+        in
+          if desc == ""
+          then defaultDesc
+          else ''
+            ${desc}
+
             ${defaultDesc}
           '';
       };