programs.pijul.enable = true;

    options.programs.pijul = {
      enable = mkEnableOption "enable the pijul package manager.";
      enableBashIntegration = mkEnableOption "install pijul bash completions";
      enableZshIntegration = mkEnableOption "install pijul zsh completions";
    };

      # pijul completions
      programs.bash.initExtra = mkIf config.programs.pijul.enableBashIntegration ''
        source ${pkgs.pijul}/share/bash-completion/completions/pijul.bash
      '';
      programs.zsh.initExtra = mkIf config.programs.pijul.enableZshIntegration ''
        source ${pkgs.pijul}/share/zsh/site-functions/_pijul
      '';

          if config.programs.pijul.enable
          then [pijul]
          else []
        )
        ++ (