shell.nix

{ sources ? import ./nix/sources.nix
, pkgs ? import sources.nixpkgs { overlays = [ ]; config = { }; }
}:

with pkgs;
let
  lib = import <nixpkgs/lib>;
  inherit (lib) optional optionals;

  basePackages = with pkgs; [
    (python310.withPackages (ps: with ps; [ pynvim pip virtualenv ]))

    # Without this, we see a whole bunch of warnings about LANG, LC_ALL and locales in general.
    # The solution is from: https://github.com/NixOS/nix/issues/318#issuecomment-52986702
    glibcLocales
    coreutils
    git
  ];

  requiredPackages = basePackages
    ++ lib.optional stdenv.isLinux inotify-tools
    ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
    CoreFoundation
    CoreServices
  ]);
  env = buildEnv {
    name = "dev-environment";
    paths = requiredPackages;
  };

in
stdenv.mkDerivation rec {
  name = "bazix-environment";

  phases = [ "nobuild" ];

  buildInputs = [ env ];

  shellHook = ''
    if [[ ! -d venv ]]; then
      pip freeze | grep "virtualenv" &> /dev/null || pip install virtualenv
      python -m virtualenv venv --download
      source venv/bin/activate
    else
      source venv/bin/activate
    fi
    pip install -r ./requirements/dev-requirements.lock.txt
  '';
  enableParallelBuilding = true;

  LOCALE_ARCHIVE = if stdenv.isLinux then "${glibcLocales}/lib/locale/locale-archive" else "";

  nobuild = ''
    echo Do not run this derivation with nix-build, it can only be used with nix-shell
  '';
}