{ config, pkgs, lib, ... }: {
  environment.variables.SHELL = lib.getExe pkgs.fish;
  environment.shells = [ pkgs.fish ];
  programs.fish.enable = true;
  programs.fish.useBabelfish = true;
  programs.fish.babelfishPackage = pkgs.babelfish;
  # needed to address bug where $PATH is not properly set for fish:
  # https://github.com/LnL7/nix-darwin/issues/122
  programs.fish.shellInit = ''
    for p in (string split : ${config.environment.systemPath})
      if not contains $p $fish_user_paths
        set -Ua fish_user_paths $p
      end
    end
  '';
}