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# based on https://gist.github.com/TikhonJelvis/be42400fc31bac0cd1736740fe5eb83b
{ nixpkgs ? import <nixpkgs> {}, compiler ? "default" }:
let
inherit (nixpkgs) pkgs;
# Build a default.nix file from our .cabal file:
here = ./.;
project = pkgs.stdenv.mkDerivation ({
name = "default.nix";
buildCommand = ''
${pkgs.cabal2nix}/bin/cabal2nix file://${here} > $out
'';
});
# Use the package set for our compiler:
haskellPackages = if compiler == "default"
then pkgs.haskellPackages
else pkgs.haskell.packages.${compiler};
# Helper function that gets Nix-packaged dependencies off GitHub.
# GitHub project needs a default.nix file for this to work.
fetchHaskell = { url, rev, sha256 }:
haskellPackages.callPackage (pkgs.fetchgit { inherit url rev sha256; }) {};
# Note: fetchHaskell shouldn't download the package if you already
# have it in the system.
base = haskellPackages.callPackage project {
## Specify GitHub dependencies here.
## You can get url, rev and sha256 by running 'nix-prefetch-git git@...'
# extraPackage = fetchHaskell {
# url = "git@...";
# rev = "<commit hash>";
# sha256 = "<sha256 hash>";
# };
};
in
if pkgs.lib.inNixShell then base.env else base
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