From 3fa14ebe71e8384b90794688bbefc680644ca1e2 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Thu, 23 Sep 2021 21:55:17 +0200
Subject: [PATCH] lib: attrs: add 'recursiveMerge'

---
 lib/attrs.nix | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib/attrs.nix b/lib/attrs.nix
index 84b63c7..75114b2 100644
--- a/lib/attrs.nix
+++ b/lib/attrs.nix
@@ -1,6 +1,13 @@
 { lib, ... }:
 let
-  inherit (lib) filterAttrs listToAttrs mapAttrs' nameValuePair;
+  inherit (lib)
+    filterAttrs
+    foldl
+    listToAttrs
+    mapAttrs'
+    nameValuePair
+    recursiveUpdate
+    ;
 in
 {
   # Filter a generated set of attrs using a predicate function.
@@ -19,6 +26,13 @@ in
   #   attrs
   genAttrs' = values: f: listToAttrs (map f values);
 
+  # Merge a list of attrs recursively, later values override previous ones.
+  #
+  # recursiveMerge ::
+  #   [ attrs ]
+  #   attrs
+  recursiveMerge = foldl recursiveUpdate { };
+
   # Rename each of the attributes in an attribute set using the mapping function
   #
   # renameAttrs ::