nix/modules/stuff/xdg.nix

{ lib, pkgs, config, ...}: let
  inherit (lib) mkIf mkEnableOption mkOption;
  cfg = config.chuj.xdg;
  user = config.chuj.system.user;
in {
  options.chuj.xdg = {
    enable = mkEnableOption "xdg";
  };

  config = let
    hmCfg = config.home-manager.users.${user};
    HOME = hmCfg.home.homeDirectory;
  in mkIf cfg.enable {
    xdg.portal = {
      enable = true;
      xdgOpenUsePortal = true;
      extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
      config.common.default = [ "*" ];
    };

    home-manager.users.${user} = {
      xdg = {
        dataHome = "${HOME}/.local/share";
        configHome = "${HOME}/.config";
        stateHome = "${HOME}/.local/state";
        cacheHome = "${HOME}/.cache";

        userDirs = {
          enable = true;
          desktop = "${HOME}/Desktop";
          documents = "${HOME}/Documents";
          download = "${HOME}/Downloads";
          music = "${HOME}/Music";
          pictures = "${HOME}/Pictures";
          publicShare = "${HOME}/Public";
          templates = "${HOME}/Templates";
          videos = "${HOME}/Videos";
        };
      };

      home.sessionVariables = let
        XDG_DATA_HOME = hmCfg.xdg.dataHome;
        XDG_CONFIG_HOME = hmCfg.xdg.configHome;
        XDG_STATE_HOME = hmCfg.xdg.stateHome;
        XDG_CACHE_HOME = hmCfg.xdg.cacheHome;
      in {
        ANDROID_USER_HOME = "${XDG_DATA_HOME}/android";
        ANDROID_HOME = "${XDG_DATA_HOME}/android/sdk";
        GRADLE_USER_HOME = "${XDG_DATA_HOME}/gradle";
        PYTHONSTARTUP = "${XDG_CONFIG_HOME}/python/pythonrc";
        HISTFILE = "${XDG_CACHE_HOME}/bash/history";
        CARGO_HOME = "${XDG_DATA_HOME}/cargo";
        _JAVA_OPTIONS = "-Djava.utils.prefs.userRoot=${XDG_CONFIG_HOME}/java";
        GNUPGHOME = "${XDG_DATA_HOME}/gnupg";
        WINEPREFIX = "${XDG_DATA_HOME}/wine";
        RUSTUP_HOME = "${XDG_DATA_HOME}/rustup";
        NUGET_PACKAGES = "${XDG_CACHE_HOME}/NuGetPackages";
        FCEUX_HOME = "${XDG_CONFIG_HOME}/fceux";
        DOTNET_CLI_HOME = "${XDG_CONFIG_HOME}/dotnet";
        GTK2_RC_FILES = lib.mkForce "${XDG_CONFIG_HOME}/gtk-2.0/gtkrc";
      };

      home.packages = with pkgs; [
        xdg-user-dirs
        xdg-utils
      ];

      xdg.configFile = {
        # todo: XDG_CACHE_HOME Not found
        "python/pythonrc".text = ''
          import os
          import atexit
          import readline

          history = os.path.join(os.environ['XDG_CACHE_HOME'], 'python_history')
          try:
              readline.read_history_file(history)
          except OSError:
              pass

          def write_history():
              try:
                  readline.write_history_file(history)
              except OSError:
                  pass

          atexit.register(write_history)
        '';
      };
    };
  };
}