probably broken, car ride modularizing

modules/dev/haskell.nix

@@ -1,9 +1,21 @@
-{ config, lib, pkgs, ... }: {
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
   options.my.dev.haskell.enable = lib.mkEnableOption "enable";
   config = lib.mkIf config.my.dev.haskell.enable {
     users.users.jawz.packages = with pkgs; ([
       ghc # compiler
       haskell-language-server # lsp
     ]);
+    environment.variables = {
+      CABAL_DIR = "${XDG_CACHE_HOME}/cabal";
+      CARGO_HOME = "${XDG_DATA_HOME}/cargo";
+      STACK_ROOT = "${XDG_DATA_HOME}/stack";
+      GHCUP_USE_XDG_DIRS = "true";
+    };
   };
 }