Add option to use ghcWithHoogle

[rdesfo]

something like --hoogle would be useful when generating shell.nix

[shlevy]

Note that with https://github.com/NixOS/nixpkgs/pull/33012 this will be easier

[joprice]

For people not using the shell flag, I followed the pattern here https://mmhaskell.com/blog/2020/2/10/converting-cabal-to-nix, and was able to get hoogle working by passing withHoogle=true to envFunc:

# shell.nix
{ pkgs ? import <nixpkgs> { } }:

with pkgs;
let
    project = import ./release.nix; in
stdenv.mkDerivation {
    name = "shell";
   buildInputs = (project.envFunc { withHoogle = true; }).nativeBuildInputs;
}

[carlfish]

Note for anyone thinking of trying the above shell.nix, there's a good chance you'll run into NixOS/nixpkgs#82245 and it won't work.