VIM: configure nerdtree to autoopen when no arg set, and autoclose wh…

…en no open files

homedir/.vimrc

@@ -224,7 +224,6 @@ endfunction
 " map <left> <ESC>:NERDTreeToggle<RETURN>  " moves left fa split
 " map <F2> <ESC>ggVG:call SuperRetab()<left>
 " map <F12> ggVGg? " apply rot13 for people snooping over shoulder, good fun
-map ,n <plug>NERDTreeTabsToggle<CR>
 
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 " Useful abbrevs
@@ -272,6 +271,13 @@ vnoremap <silent> <leader>es :EsformatterVisual<CR>
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 let NERDTreeShowHidden=1
 let NERDTreeIgnore=['\.DS_Store$']
+" auto open if no file sent as arg
+autocmd StdinReadPre * let s:std_in=1
+autocmd VimEnter * if argc() == 0 && !exists("s:std_in") | NERDTree | endif
+" Toggle NERDtree with C-n
+map ,n <plug>NERDTreeTabsToggle<CR>
+" Autoclose if only NERDtree is left
+autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTreeType") && b:NERDTreeType == "primary") | q | endif
 
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 " Syntastic