mostlyabsurd shell.nix for shapr haskell-language-server

shell.nix

{ nixpkgs ? ((fetchTarball "channel:nixos-20.09")), compiler ? "ghc884" }:

let
  config = {
    allowBroken = true;
    packageOverrides = super:
      let self = super.pkgs;
      in {
        haskell = super.haskell // {
          packages = super.haskell.packages // {
            ${compiler} = super.haskell.packages.${compiler}.override {
              overrides = self: super:
                with pkgs.haskell.lib; {
                  pandoc-include-code = doJailbreak super.pandoc-include-code;
                  hakyll = super.callHackageDirect {
                    pkg = "hakyll";
                    ver = "4.13.4.1";
                    sha256 =
                      "sha256-s1VfSPYwCbT3wagcibTXPRWQouJmDOqm7k+bQUo6yTY=";
                  } { };
                };
            };
          };
        };
      };
  };
  hindent =
    (import (fetchTarball "channel:nixos-20.03") { }).haskellPackages.hindent;

  pkgs = import nixpkgs { inherit config; };

  ghc = pkgs.haskell.packages.${compiler}.ghcWithHoogle (ps:
    with ps; [
      JuicyPixels
      JuicyPixels-extra
      hakyll
      hakyll-images
      #######
      brittany
      cabal-bounds
      cabal-edit
      haskell-language-server
      hlint
      #######
      blaze-html
      bytestring
      constraints
      containers
      enclosed-exceptions
      filepath
      fsnotify
      hinotify
      http2
      http-conduit
      lifted-async
      lifted-base
      pandoc
      pandoc-citeproc
      pandoc-include-code
      pandoc-types
      rfc5051
      shelly
      split
      text
      time
      unordered-containers
      wai-app-static
      wai-extra
      warp
      xml-conduit
    ]);

  purifycss = (import ./nix/purifycss { inherit pkgs; }).purifycss;

in pkgs.stdenv.mkDerivation {
  name = "www-mostlyabsurd-com";
  buildInputs = with pkgs; [
    cabal-install
    ghc
    ghcid
    hindent
    html-tidy
    imagemagick
    inotifyTools
    nodePackages.node2nix
    nodePackages.npm
    nodePackages.prettier
    nodejs
    purifycss
    sass
    which
    zlib
  ];

  shellHook = ''
    eval $(egrep ^export ${ghc}/bin/ghc)
    export HIE_HOOGLE_DATABASE="$(cat $(which hoogle) | sed -n -e 's|.*--database \(.*\.hoo\).*|\1|p')"
  '';
}