From 7d2c43d157e4f957e0767faaaba820ade95a816b Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Tue, 24 Aug 2021 22:25:12 +0200
Subject: [PATCH] lib: lists: add 'mapFilter'

---
 lib/lists.nix | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 lib/lists.nix

diff --git a/lib/lists.nix b/lib/lists.nix
new file mode 100644
index 0000000..a3720bf
--- /dev/null
+++ b/lib/lists.nix
@@ -0,0 +1,13 @@
+{ lib, ... }:
+let
+  inherit (lib) filter;
+in
+{
+  # Filter a list using a predicate function after applying a map.
+  #
+  # mapFilter ::
+  #   (value -> bool)
+  #   (any -> value)
+  #   [ any ]
+  mapFilter = pred: f: attrs: filter pred (map f attrs);
+}