nixos-config/modules/greetd/default.nix

{ pkgs, config, lib, ... }:
with lib;
let
  cfg = config.eboskma.greetd;
in
{
  options.eboskma.greetd = {
    enable = mkEnableOption "enable greetd";
  };

  config = mkIf (cfg.enable)
    {
      services.greetd = {
        enable = true;
        restart = true;
        settings = {
          default_session = {
            command = "${pkgs.sway}/bin/sway --config /etc/greetd/sway-config";
          };
        };
      };
      environment.systemPackages = [ pkgs.greetd.gtkgreet ];

      environment.etc = {
        "greetd/sway-config" = {
          text = ''
            # `-l` activates layer-shell mode. Notice that `swaymsg exit` will run after gtkgreet.
            exec "${pkgs.greetd.gtkgreet}/bin/gtkgreet -l; swaymsg exit"
            bindsym Mod4+shift+e exec swaynag \
              -t warning \
              -m 'What do you want to do?' \
              -b 'Poweroff' 'systemctl poweroff' \
              -b 'Reboot' 'systemctl reboot'
          '';
          user = "greeter";
          group = "greeter";
        };
        "greetd/environments" = {
          text = ''
            ${pkgs.sway}/bin/sway
            ${pkgs.bash}/bin/bash
          '';
          user = "greeter";
          group = "greeter";
        };
      };
    };
}