nixos-config/config/programs/swayidle.nix

{pkgs, ...}: let
  lock-script = pkgs.writeScript "suspend" ''
    ${pkgs.swaylock}/bin/swaylock -f -c 000000
    ${pkgs.mpc-cli}/bin/mpc pause
  '';
  screen-off-script = pkgs.writeScript "screenOff" ''
    ${pkgs.sway}/bin/swaymsg "output * dpms off"
  '';
  suspend-script = pkgs.writeScript "suspend" ''
    ${pkgs.systemd}/bin/systemctl suspend
  '';
  resume-script = pkgs.writeScript "resume" ''
    ${pkgs.sway}/bin/swaymsg "output * dpms on"
  '';
  unlock-script = pkgs.writeScript "unlock" ''
    ${pkgs.procps}/bin/pkill swaylock
    ${pkgs.mpc-cli}/bin/mpc play
  '';
in {
  services.swayidle = {
    enable = true;
    events = [
      { event = "before-sleep"; command = "${lock-script}"; }
      { event = "lock"; command = "${lock-script}"; }
      { event = "unlock"; command = "${unlock-script}"; }
    ];
    timeouts = [
      { timeout = 300; command = "${lock-script}"; }
      { timeout = 305; command = "${screen-off-script}"; resume = "${resume-script}"; }
      { timeout = 900; command = "${suspend-script}"; }
    ];
  };
}