os/modules/graphical/sway/config/config.d/mode_system.conf.nix

{
  pkgs,
  psCfg,
  ...
}: with pkgs; 
''
  # Set shut down, restart and locking features
''
+ (
  if psCfg.core.hibernation.enable
  then ''
    set $mode_system (e)xit, (l)ock, (h)ibernate, (r)eboot, (Shift+s)hutdown
  ''
  else ''
    set $mode_system (e)xit, (l)ock, (r)eboot, (Shift+s)hutdown
  ''
)
+ ''
  bindsym $mod+0 mode "$mode_system"

  mode "$mode_system" {
    bindsym e exec ${sway}/bin/swaymsg exit, mode "default"
    bindsym l exec ${swaylock-bg}/bin/swaylock-bg, mode "default"
''
+ (
  if psCfg.core.hibernation.enable
  then ''
    bindsym h exec ${systemd}/bin/systemctl hibernate, mode "default"
  ''
  else ""
)
+ ''
    bindsym r exec ${systemd}/bin/systemctl reboot, mode "default"
    bindsym Shift+s exec ${systemd}/bin/systemctl poweroff, mode "default"

    # exit system mode: "Enter" or "Escape"
    bindsym Return mode "default"
    bindsym Escape mode "default"
}
''