From 525b598ce37688ed7c19c4bfd82850688d41a1d8 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Mon, 5 Oct 2020 17:38:48 +0200
Subject: [PATCH] flake: Add overlay

---
 flake.nix | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index 8388e0b..d711a13 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,14 +9,21 @@
       "x86_64-darwin"
       "x86_64-linux"
     ];
+    arionFromPkgs = pkgs: import ./nix/arion.nix { inherit pkgs; };
   in {
 
+    # The overlay is currently the recommended way to integrate arion,
+    # because its arion attribute behaves just like Nixpkgs.
+    overlay = final: prev: {
+      arion = arionFromPkgs final;
+    };
+
     packages = lib.genAttrs systems (system:
     let
       pkgs = nixpkgs.legacyPackages.${system};
     in
     {
-      arion = import ./nix/arion.nix { inherit pkgs; };
+      arion = arionFromPkgs pkgs;
     });
 
     # Does not include the eval and build functions like you may expect from Nixpkgs.