fix(haskell): Persist Cabal store

users/crumb/programs/haskell.nix

@@ -37,10 +37,25 @@
     }
   '';
 
-  # Some global Cabal configuration.
-  xdg.configFile.".cabal/config".text = ''
-    -- Globally-enable Nix integration.  See
-    -- https://cabal.readthedocs.io/en/3.4/nix-integration.html
-    nix: True
-  '';
+  sydnix.impermanence.cache.directories =
+    let xdg-cache-dir =
+          config.home.cacheHome
+            or "${config.home.homeDirectory}/.cache";
+    in [
+      # We don't want to rebuild Hackage simply due to a reboot, do we?  }:)
+      (lib.removePrefix "${config.home.homeDirectory}/"
+        "${xdg-cache-dir}/cabal")
+    ];
+
+  # # Some global Cabal configuration.
+  # xdg.configFile."cabal/config".text = ''
+  #   repository hackage.haskell.org
+  #     url: http://hackage.haskell.org/
+    
+  #   nix: True
+  #   remote-repo-cache: /home/crumb/.cache/cabal/packages
+  #   build-summary: /home/crumb/.cache/cabal/logs/build.log
+  #   jobs: $ncpus
+  #   remote-build-reporting: none
+  # '';
 }