[Nix-dev] Haskell doctest

[Richard Wallace]

Hello all,

We've got a Haskell project that we're using nix to ensure a consistent
build environment.  I'm working on adding tests with doctest, and am
running into trouble.  Here are the default.nix and shell.nix files we're
using (many dependencies elided for brevity)

# This file was auto-generated by cabal2nix. Please do NOT edit manually!

{ cabal, aeson, lens, doctest,
}:

cabal.mkDerivation (self: {
  pname = "hiberico";
  version = "1";
  src = ./.;
  isLibrary = false;
  isExecutable = true;
  buildDepends = [
    aeson lens
  ];
  testDepends = [
    doctest aeson lens
  ];

  meta = {
    description = "Iberico in Haskell";
    license = "unknown";
    platforms = self.ghc.meta.platforms;
  };
})

# shell.nix
let
   nixpkgs = (import <nixpkgs> {}).fetchgit {
    url = "git://github.com/NixOS/nixpkgs.git";
    rev = "c758ec756b60a2161a5d7369d07d3eb2fe04a5aa";
    sha256 = "01x01gwj2pm165sdhb1fxfdzl638kksx79dyadji5f2wp4hssk8m";
  };
in
  { system ? builtins.currentSystem
  , pkgs ? import nixpkgs { inherit system; }
  , haskellPackages ? pkgs.haskellPackages.override {
      extension = self: super: {
        hiberico = self.callPackage ./. {};
      };
    }
  }:
  pkgs.lib.overrideDerivation haskellPackages.hiberico (attrs: {
    buildInputs = [
      haskellPackages.cabalInstall
    ] ++ attrs.buildInputs;
  })


When I enter the nix-shell (`nix-shell --pure shell.nix`), the environment
seems setup correctly.  I can run `cabal configure --enable-tests && cabal
build && cabal test` and it gets to the point where doctest is parsing the
source files and I get

Building hiberico-1...
Preprocessing executable 'hiberico' for hiberico-1...
Preprocessing test suite 'doctests' for hiberico-1...
Running 1 test suites...
Test suite doctests: RUNNING...

src/Topology.hs:11:18:
    Could not find module 'Data.Aeson'
    Perhaps you meant Data.Version (from base)
    Use -v to see a list of the files searched for.

I've added all the dependencies to the doctests suite in the cabal file. Is
there something else I'm missing?

Thanks,
Rich
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