Boilerplate for a nice haskell hacking experience, with nix, direnv, lorri, cabal new-*, and ghcide

.envrc

eval "$(lorri direnv)"

hie.yaml

cradle: {cabal: {}}

shell.nix

{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc865" }:
let
  inherit (nixpkgs) pkgs;
  ghc = pkgs.haskell.packages.${compiler}.ghcWithPackages (ps: with ps; [
          cabal-install 
          brittany
          ghcid
        ]);
in

with pkgs;

runCommand "dummy" {
  buildInputs = [
    ghc
    (import (builtins.fetchTarball "https://github.com/hercules-ci/ghcide-nix/tarball/master") {}).ghcide-ghc865
  ];
  shellHook = ''
    export NIX_GHC="${ghc}/bin/ghc"
    export NIX_GHCPKG="${ghc}/bin/ghc-pkg"
    export NIX_GHC_DOCDIR="${ghc}/share/doc/ghc/html"
    export NIX_GHC_LIBDIR=$( $NIX_GHC --print-libdir )
  '';
} ""