shell.nix

{pkgs ? import ./nixpkgs.nix {}}:

with pkgs;

mkShell {
  # XXX: hack for macosX, this flags disable bazel usage of xcode
  # Note: this is set even for linux so any regression introduced by this flag
  # will be catched earlier
  # See: https://github.com/bazelbuild/bazel/issues/4231
  BAZEL_USE_CPP_ONLY_TOOLCHAIN=1;

  # Set UTF-8 local so that run-tests can parse GHC's unicode output.
  LANG="C.UTF-8";

  buildInputs = [
    bazel_4
    git
    gnused
    nix
    openjdk11
    python3
    which
    # For stack_install.
    stack
    # Needed to get correct locale for tests with encoding
    glibcLocales
    # to avoid CA certificate failures on macOS CI
    cacert
  ];

  shellHook = ''
    # Add nix config flags to .bazelrc.local.
    #
    BAZELRC_LOCAL=".bazelrc.local"
    if [ ! -e "$BAZELRC_LOCAL" ]
    then
      ARCH=""
      if [ "$(uname)" == "Darwin" ]; then
        ARCH="darwin"
      elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
        ARCH="linux"
      fi
      echo "[!] It looks like you are using a ''${ARCH} nix-based system. In order to build this project, you need to add the two following host_platform entries to your .bazelrc.local file."
      echo ""
      echo "build --host_platform=@io_tweag_rules_nixpkgs//nixpkgs/platforms:host"
    fi

    # source bazel bash completion
    source ${pkgs.bazel}/share/bash-completion/completions/bazel.bash
  '';
}