cleanup

nix/overlay.nix

@@ -0,0 +1,7 @@
+inputs: final: prev: {
+  haskellPackages = prev.haskellPackages.override {
+    overrides = haskellSelf: haskellSuper:
+      ((import ./utils.nix) { inherit inputs; pkgs = prev; })
+        // { };
+  };
+}

nix/packages.nix

@@ -0,0 +1,3 @@
+inputs: [
+  ../code
+]

nix/utils.nix

@@ -0,0 +1,27 @@
+{ inputs, pkgs, ... }:
+let
+  fn = root: map (p: "${root}/" + p) (builtins.attrNames (builtins.readDir root));
+  gn = root:
+    let items = builtins.readDir root;
+        fn = file: type:
+          if type == "regular"
+          then
+            (let m = (builtins.match "(.*)\\.cabal" file);
+            in if !(isNull m)
+            then { "${builtins.elemAt m 0}" = root; }
+            else {})
+          else {};
+    in builtins.foldl' (x: y: x // y) {} (builtins.attrValues (builtins.mapAttrs fn items));
+  hn = s:
+    builtins.filter
+      (x: (builtins.hasAttr "flake" x) && !x.flake)
+      s;
+  packagePaths = builtins.foldl'
+    (x: y: x // y)
+    {}
+    (map gn ((import ./packages.nix) inputs));
+in
+  builtins.mapAttrs
+    (name: path: pkgs.haskellPackages.callCabal2nix name path {})
+    packagePaths
+