{ config, pkgs, lib, ... }: let 
  dwl-startup = pkgs.writeScript "dwl-startup.sh" ''
    #!${pkgs.bash}/bin/bash
    ${pkgs.yambar}/bin/yambar
  '';

  launch_emacs = pkgs.writeScript "emacsclient-or-start" ''
    #!${pkgs.bash}/bin/bash
    emacsclient --create-frame --alternate-editor=""
  '';
in {
  imports = [
    ./wayland.nix
  ];

  nixpkgs.overlays = [
    (final: prev: {
      dwl = prev.dwl.overrideAttrs (old: {
        postPatch = ''
          export termcmd=${pkgs.foot}/bin/foot
          export editcmd=${launch_emacs}
          export menucmd=${pkgs.fuzzel}/bin/fuzzel
          substituteAll ${./dwl/config.def.h} ./config.def.h
        '';
        postInstall = ''
          sed -i "s#Exec=dwl#Exec=dwl -s ${dwl-startup}#" $out/share/wayland-sessions/dwl.desktop
          chmod ugo+x $out/share/wayland-sessions/dwl.desktop
	'';
        passthru.providedSessions = ["dwl"];
      });
    })
  ];

  environment.sessionVariables = {
    NIXOS_OZONE_WL=1;
    WLR_NO_HARDWARE_CURSORS=1;
    SDL_VIDEODRIVER="wayland";
    QT_QPA_PLATFORM="wayland-egl";
    QT_WAYLAND_DISABLE_WINDOW_DECORATIONS="1";
    __JAVA_AWT_WM_NONREPARENTING=1;
  };

  environment.systemPackages = with pkgs; [
    dwl
    yambar
    foot
  ];
}