{ config, lib, pkgs, ... }:

{
  # Convenient shorthand for quickly opening Haskell REPLs.
  programs.bash.profileExtra = ''
    # Start a GHCi REPL with the given packages made available.
    ghci-with-packages () {
      nix-shell -p "haskellPackages.ghcWithPackages (p: with p; [ $@ ])" \
        --run ghci
    }

    # Run GHC with the given packages made available.
    ghc-with-packages () {
      getopt -o "p" -- "$@"
      while true; do
        case "$1" in
          -p)
            packages="$1"
            shift 2
            ;;
          --)
            shift
            break
            ;;
        esac
      done

      if [ $? -ne 0 ]; then
       echo "Invalid options provided"
       exit 1
      fi

      eval set -- "$options"

      nix-shell -p "haskellPackages.ghcWithPackages (p: with p; [ $packages ])" \
        --run "ghc $@"
    }
  '';

  sydnix.impermanence.cache.directories =
    let xdg-cache-dir =
          config.home.cacheHome
            or "${config.home.homeDirectory}/.cache";
    in [
      # We don't want to rebuild Hackage simply due to a reboot, do we?  }:)
      (lib.removePrefix "${config.home.homeDirectory}/"
        "${xdg-cache-dir}/cabal")
    ];

  # # Some global Cabal configuration.
  # xdg.configFile."cabal/config".text = ''
  #   repository hackage.haskell.org
  #     url: http://hackage.haskell.org/
    
  #   nix: True
  #   remote-repo-cache: /home/crumb/.cache/cabal/packages
  #   build-summary: /home/crumb/.cache/cabal/logs/build.log
  #   jobs: $ncpus
  #   remote-build-reporting: none
  # '';
}