Added direnv

modules/dev/direnv.nix

@@ -0,0 +1,22 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.samfelag.modules.dev.direnv;
+in
+{
+  options.samfelag.modules.dev.direnv = {
+    enable = lib.mkEnableOption "direnv";
+  };
+  config = lib.mkIf cfg.enable {
+    hm.programs.direnv = {
+      enable = true;
+      nix-direnv.enable = true;
+    };
+
+    # Optional: To protect your nix-shell against garbage collection
+    nix.extraOptions = ''
+      keep-outputs = true
+      keep-derivations = true
+    '';
+  };
+}