From 4ee556cfe9528a321f4a3746ca83f97feacf500e Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Fri, 9 Jan 2015 13:24:58 -0500
Subject: mkOverridable: Use functors to allow overridable functions

---
 lib/customisation.nix | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'lib/customisation.nix')

diff --git a/lib/customisation.nix b/lib/customisation.nix
index 04a5cb4203358..f16043cf9a3e3 100644
--- a/lib/customisation.nix
+++ b/lib/customisation.nix
@@ -65,6 +65,13 @@ rec {
           overrideDerivation = fdrv:
             makeOverridable (args: overrideDerivation (f args) fdrv) origArgs;
         })
+      else if builtins.isFunction ff then
+        { override = newArgs:
+            makeOverridable f (origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs));
+          __functor = self: ff;
+          deepOverride = throw "deepOverride not yet supported for functors";
+          overrideDerivation = throw "overrideDerivation not yet supported for functors";
+        }
       else ff;
 
   deepOverrider = newArgs: name: x: if builtins.isAttrs x then (
-- 
cgit 1.4.1