anchor.diff:      enableSyntaxHighlighting = true;
       shellInit =
         ''
  +        # fasd
           alias a='fasd -a'        # any
           alias s='fasd -si'       # show / search / select
           alias d='fasd -d'        # directory
  
positive.code:         alias z='fasd_cd -d'     # cd, same functionality as j in autojump
          alias zz='fasd_cd -d -i' # cd with interactive selection
          alias v='f -e vim' # quick opening files with vim
        '';
  
      # environment variables
      variables = {};
    };
  }
  
negative.code:       pkgs.ripgrep
        pkgs.neovim
        pkgs.nodejs-9_x
        pkgs.go
      ];
  
    # Auto upgrade nix package and the daemon service.
  