anchor.diff:          alias zz='fasd_cd -d -i' # cd with interactive selection
           alias v='f -e vim' # quick opening files with vim
           alias vi='vim'           # alias vi to vim
  -        alias drsl='NIX_PATH=darwin=$HOME/Projects/nix-darwin:darwin-config=$HOME/.nixpkgs/darwin-configuration.nix:$NIX_PATH darwin-rebuild switch' # switch with local repo
  +        alias drsl='darwin-rebuild switch' # switch with local repo
         '';
   
       # environment variables
  
positive.code:       pkgs.docker-machine
        pkgs.docker-machine-xhyve
        pkgs.cdecl # Explains c declarations (cdecl explain "const struct S** s")
        pkgs.texlive.combined.scheme-full
        pkgs.emacs
        myHunspell
        pkgs.dos2unix
        pkgs.tmux
      ];
  
    # Auto upgrade nix package and the daemon service.
    services.nix-daemon.enable = true;
  
negative.code:   # List packages installed in system profile. To search by name, run:
    # $ nix-env -qaP | grep wget
    environment.systemPackages =
      [ pkgs.fzf
        pkgs.gnupg
        pkgs.ripgrep
        pkgs.neovim
  