wip: gftest: init

pkgs/gftest/default.nix

@@ -0,0 +1,25 @@
+{ gf-core
+, breakpointHook
+, fetchFromGitHub
+, compiler ? "ghc98"
+, haskell
+}:
+
+let
+  src = fetchFromGitHub {
+    owner = "GrammaticalFramework";
+    repo = "gftest";
+    rev = "ef7c99143d84a29fb28bbc464f661566d44a6130";
+    hash = "sha256-t/LaG5+bdv7f0URcn/aFx6nUIvxSSEbpWeZS92/Gbog=";
+  };
+  hpkgs = haskell.packages.${compiler}.override {
+    overrides = hself: hsuper: {
+      pgf2 = gf-core;
+    };
+  };
+  pkg = hpkgs.callCabal2nix "gftest" src {};
+in pkg.overrideAttrs (final: prev: {
+  nativeBuildInputs = (prev.nativeBuildInputs or []) ++ [
+    breakpointHook
+  ];
+})