From 11f91f83e6da7a71994e45b1d478d4c9defd0290 Mon Sep 17 00:00:00 2001
From: Erik Arvstedt <erik.arvstedt@gmail.com>
Date: Fri, 20 Jan 2023 13:45:12 +0100
Subject: [PATCH] add option `nix-bitcoin.pkgOverlays`

This simplifies extending `nix-bitcoin.pkgs` and is required for
extension flakes.
For now, mark this as `internal`.
---
 modules/nix-bitcoin.nix | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/modules/nix-bitcoin.nix b/modules/nix-bitcoin.nix
index 3263ffe..ef8f7a2 100644
--- a/modules/nix-bitcoin.nix
+++ b/modules/nix-bitcoin.nix
@@ -1,4 +1,4 @@
-{ config, pkgs, lib, ... }:
+{ config, options, pkgs, lib, ... }:
 
 with lib;
 {
@@ -8,6 +8,18 @@ with lib;
         type = types.attrs;
         default = (import ../pkgs { inherit pkgs; }).modulesPkgs;
         defaultText = "nix-bitcoin/pkgs.modulesPkgs";
+        apply = base:
+          let
+            final = foldl (prev: overlay:
+              prev // (overlay prev final)
+            ) base options.nix-bitcoin.pkgOverlays.definitions;
+          in
+            final;
+      };
+
+      pkgOverlays = mkOption {
+        internal = true;
+        type = with types; functionTo attrs;
       };
 
       lib = mkOption {