config.nix

{
  allowUnfree = true;

  packageOverrides = pkgs: rec {
    home-manager = import ./home-manager { inherit pkgs; };
    irssi = pkgs.writeScriptBin "irssi" ''
      export FREENODE_PASSWORD=$(${pkgs.pass}/bin/pass social/freenode)
      if [ -z $FREENODE_PASSWORD ]; then exit; fi
      ${pkgs.irssi}/bin/irssi
    '';
  };
}