initial commit

1 files changed, 24 insertions, 0 deletions

diff --git a/default.nix b/default.nix
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+
+let
+  pkgs = import <nixpkgs> {};
+  hsEnv = pkgs.haskellPackages.ghcWithPackages (hsPkgs : with hsPkgs; [
+    mtl
+  ]);
+in
+
+pkgs.myEnvFun {
+  name = "hack";
+  buildInputs = with pkgs; [
+    hsEnv
+  ];
+
+  # XXX https://nixos.org/wiki/Haskell says:
+  #   Since tools (such as hdevtools [snap-loader-dynamic in our case]) that
+  #   rely on the ghc-api to do haskell language manipulation are sensitive
+  #   to nix-wrapping of ghc, we need the extraCmds line to ensure the
+  #   proper ghc-wrapping environment variables are set inside the
+  #   dev-environment shell.
+  extraCmds = ''
+    $(grep export ${hsEnv.outPath}/bin/ghc)
+  '';
+}