custom/opossum-wrapper.nix


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{ stdenv
, ghcWithPackages
, makeWrapper
, opossum
, additionalPackages ? (p: [])
}:

let
  myEnv = ghcWithPackages (p: with p; [ beuteltier opossum ] ++ additionalPackages p);
in stdenv.mkDerivation {
  name = "opossum-wrapper";

  nativeBuildInputs = [ makeWrapper ];

  buildCommand = ''
    mkdir -p $out/bin
    makeWrapper ${opossum}/bin/opossum $out/bin/opossum \
      --set NIX_GHC ${myEnv}/bin/ghc
  '';
}