From aa75fa1eaae8c4abd12bb33216979d0069174a29 Mon Sep 17 00:00:00 2001
From: Gabriella Gonzalez <GenuineGabriella@gmail.com>
Date: Tue, 7 Nov 2023 11:23:57 -0800
Subject: [PATCH] haskell.lib.packagesFromDirectory: only `.nix` files

This changes `haskell.lib.packagesFromDirectory` to ignore non-Nix
files so that it doesn't attempt to run `callPackage` on, say, a
`.md` file in the same directory.
---
 pkgs/development/haskell-modules/lib/compose.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/lib/compose.nix b/pkgs/development/haskell-modules/lib/compose.nix
index fa6d2a20a9a2..f3a25e293d88 100644
--- a/pkgs/development/haskell-modules/lib/compose.nix
+++ b/pkgs/development/haskell-modules/lib/compose.nix
@@ -407,7 +407,9 @@ rec {
 
     self: super:
       let
-        haskellPaths = builtins.attrNames (builtins.readDir directory);
+        haskellPaths =
+          lib.filter (lib.hasSuffix ".nix")
+            (builtins.attrNames (builtins.readDir directory));
 
         toKeyVal = file: {
           name  = builtins.replaceStrings [ ".nix" ] [ "" ] file;