wallpaper-engine-kde-plugin on NixOS

wallpaper-engine-kde-plugin.nix

{ config, lib, pkgs, ...}:

let 
  # References: https://github.com/xerhaxs/nixos/blob/main/nixosModules/pkgs/wallpaper-engine-kde-plugin.nix and https://discourse.nixos.org/t/wallpaper-engine-on-nixos-wallpaper-engine-kde-plugin/19744/25
  glslang-submodule = with pkgs; stdenv.mkDerivation {
    name = "glslang";
    installPhase = ''
      mkdir -p $out
    '';
    src = fetchFromGitHub {
      owner = "KhronosGroup";
      repo = "glslang";
      rev = "c34bb3b6c55f6ab084124ad964be95a699700d34";
      sha256 = "IMROcny+b5CpmzEfvKBYDB0QYYvqC5bq3n1S4EQ6sXc=";
    };
  };

  wallpaper-engine-kde-plugin = with pkgs; stdenv.mkDerivation rec {
    pname = "wallpaperEngineKde";
    version = "96230de92f1715d3ccc5b9d50906e6a73812a00a";
    src = fetchFromGitHub {
      owner = "Jelgnum";
      repo = "wallpaper-engine-kde-plugin";
      rev = version;
      hash = "sha256-vkWEGlDQpfJ3fAimJHZs+aX6dh/fLHSRy2tLEsgu/JU=";
      fetchSubmodules = true;
        };

    nativeBuildInputs = [
      cmake
      kdePackages.extra-cmake-modules
      glslang-submodule
      pkg-config
      gst_all_1.gst-libav
      shaderc
      ninja
    ];

    buildInputs = [
      mpv
      lz4
      vulkan-headers
      vulkan-tools
      vulkan-loader
    ] 
    ++ (with kdePackages; with qt6Packages; [
      qtbase
      qt6.full
      kpackage
      kdeclarative
      libplasma
      qtwebsockets
      qtwebengine
      qtwebchannel
      qtmultimedia
      qtdeclarative
    ])
    ++ [(python3.withPackages (python-pkgs: [ python-pkgs.websockets ]))];

    cmakeFlags = [ "-DUSE_PLASMAPKG=OFF" ];
    dontWrapQtApps = true;

    postPatch = ''
      rm -rf src/backend_scene/third_party/glslang
      ln -s ${glslang-submodule.src} src/backend_scene/third_party/glslang
    '';
    #Optional informations
    meta = with lib; {
      description = "Wallpaper Engine KDE plasma plugin";
      homepage = "https://github.com/Jelgnum/wallpaper-engine-kde-plugin";
      license = licenses.gpl2Plus;
      platforms = platforms.linux;
    };
  };
in 

{
  options.nixos = {
    pkgs.wallpaper-engine-kde-plugin = {
      enable = lib.mkOption {
        type = lib.types.bool;
        default = false;
        example = true;
        description = "Enable wallpaper-engine-kde-plugin.";
      };
    };
  };

  config = lib.mkIf (config.nixos.pkgs.wallpaper-engine-kde-plugin.enable) {
    environment.systemPackages = with pkgs; [
      wallpaper-engine-kde-plugin
      kdePackages.qtwebsockets
      kdePackages.qtwebchannel
      (python3.withPackages (python-pkgs: [ python-pkgs.websockets ]))
    ];

    system.activationScripts = {
      wallpaper-engine-kde-plugin.text = ''
        wallpaperenginetarget=/share/plasma/wallpapers/com.github.catsout.wallpaperEngineKde
        mkdir -p /home/${builtins.head (builtins.attrNames config.users.users)}/.local/share/plasma/wallpapers
        chown -R ${builtins.head (builtins.attrNames config.users.users)}:users /home/${builtins.head (builtins.attrNames config.users.users)}/.local/share/plasma
        if [ ! -e /home/${builtins.head (builtins.attrNames config.users.users)}/.local$wallpaperenginetarget ]; then
          ln -sf ${wallpaper-engine-kde-plugin}$wallpaperenginetarget /home/${builtins.head (builtins.attrNames config.users.users)}/.local$wallpaperenginetarget
        fi;
      '';
    };
  };
}

Thanks for making this package!

OK, this error disappeared after use this config: https://github.com/xerhaxs/nixos/blob/main/nixosModules/pkgs/wallpaper-engine-kde-plugin.nix

I indeed needed this as well to make python run properly. Seems like video wallpapers run (after installing qtmultimediate) while all scene wallpapers have a black screen. Is that an issue with the packaging or the plugin itself? wallpaper-engine-kde-plugin seems to support scene wallpapers so I'm not sure if I'm just doing something wrong

Just a quick heads up. If you plan on upgrading from nixos stable to unstable and you still have this file, disable it! Something changed between the versions of plasma that makes it coredumps over and over again. You better use the one in the unstable nixpkgs repo.

Well the current unstable version (from the nixpkgs repo) does not work for me yet.