[Nix-dev] ghc-mod with ghc 7.10.1

[Daiderd Jordan]

I'm using this, based on a gist https://gist.github.com/bennofs/bd243e58661af62047a5.
On my machine it works for both simple files, and cabal projects (NixOS/master da4177c).

  haskellPackageOverrides = self : super : (let inherit (pkgs.haskell-ng) lib; in {
    ghc-mod = lib.overrideCabal super.ghc-mod (oldAttrs: {
      src = pkgs.fetchgit {
        url = https://github.com/kazu-yamamoto/ghc-mod;
        rev = "247e4e0e7616fe1fecc68fdcf80d6249ac4cee4f";
        sha256 = "2a23271d0e6907351a246f095040ba18c3ab6bf1cba08a14338d701defa55474";
      };
      buildDepends = oldAttrs.buildDepends ++ [ self.cabal-helper self.cereal ];
    });

    cabal-helper = lib.overrideCabal super.cabal-helper (oldAttrs: {
      version = "0.3.2.0";
      sha256 = "06igjmr0n8418wid1pr74cgvlsmwni7ar72g9bddivlbxax1pfli";
    });
  });


— Daiderd Jordan



Has anyone gotten this to work successfully on nix? I used cabal2nix to 
create a package from ghc-mod master branch on github and did the same for 
cabal-helper. I had to disable testing on both since they fail for 
different reasons (cabal-helper tries to access something in $HOME and I'm 
not sure what ghc-mods problem is). 

When running `ghc-mod check Main.hs` on a simple file, it seems like 
cabal-helper-wrapper complains about the cabal-helper executable not being 
found under ~/.ghc/. I have no idea why it would be looking for it there or 
how to fix it. Any had any luck with this? 

Thanks, 
Rich 
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