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

{
  services.nix-daemon = {
    enable = true;
    enableSocketListener = true;
  };
  nix = {
    buildCores = lib.mkDefault 0;
    daemonIONice = true;
    daemonNiceLevel = 10;
    gc = {
      automatic = true;
      user = "alan";
      options = "--max-freed $((25 * 1024**3 - 1024 * $(df -P -k /nix/store | tail -n 1 | awk '{ print $4 }')))";
    };
  };

  nixpkgs.config = {
    allowUnfree = true;
  };

  programs.zsh = {
    enable = true;
    enableCompletion = false; # Causes >2s startup time, overlaps home-manager config
    enableBashCompletion = true;
    loginShellInit = builtins.readFile "/System/Library/Templates/Data/private/etc/zprofile";
    interactiveShellInit = ''
      if [[ "$(locale LC_CTYPE)" == "UTF-8" ]]; then
        setopt COMBINING_CHARS
      fi
      # Useful support for interacting with Terminal.app or other terminal programs
      [[ -r "/etc/zshrc_$TERM_PROGRAM" ]] && . "/etc/zshrc_$TERM_PROGRAM"
    '';
  };

  environment.systemPackages = with pkgs; [
    watch
    coreutils-prefixed
  ];
}