anchor.diff:  
     services.khd.enable = true;
   
  +  launchd.user.agents.fetch-nixpkgs = {
  +    command = "${pkgs.git}/bin/git -C ~/.nix-defexpr/nixpkgs fetch origin master";
  +    environment.GIT_SSL_CAINFO = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
  +    serviceConfig.KeepAlive = false;
  +    serviceConfig.ProcessType = "Background";
  +    serviceConfig.StartInterval = 60;
  +  };
  +
     services.activate-system.enable = true;
     services.nix-daemon.enable = true;
     services.nix-daemon.tempDir = "/nix/tmp";
  
positive.code:     if !isdirectory(expand(&directory))
        call mkdir(expand(&directory), "p")
      endif
    '';
  
    programs.zsh.enable = true;
  
negative.code:     set bg=dark
  
      set clipboard=unnamed
  
      set backup
      set backupdir=~/.vim/tmp/backup//
  