configuration.nix/modules/home/programs/swaylock/default.nix

{ config, ... }: {
  programs.swaylock = {
    enable = true;
    settings = {
      color = "000000";
      line-color = "ffffff";
      show-failed-attempts = true;
      image = config.home.homeDirectory + "/pic/bg.png";
    };
  };
}