anchor.diff:      if has("autocmd")
         autocmd VimEnter * :call SetupCtrlP()
       endif
  +
  +    tab sball
  +    set switchbuf=usetab,newtab
  +    let g:NERDTreeDirArrowExpandable = '+'
  +    let g:NERDTreeDirArrowCollapsible = '-'
  +    " hide NERDTree on file open
  +    let g:NERDTreeQuitOnOpen = 1
  +    " do not display NERDTree help
  +    let g:NERDTreeMinimalUI = 1
    '';
   
     neovim-unwrapped = pkgs.neovim-unwrapped.overrideDerivation (old: {
  
positive.code:           neovim-gui-shim
            vim-vinegar
            vim-fugitive
          ];
          opt = [ nvim-lsp ];
        };
  
negative.code:     let g:airline_powerline_fonts = 0
      let g:airline_theme='solarized'
  
      map <C-o> <esc>:NERDTreeToggle<CR>
  
      let g:VM_mouse_mappings = 1
      let g:VM_maps = {}
  