autocmd VimEnter * NERDTree | wincmd p
autocmd BufEnter * if tabpagenr('$') == 1 && winnr('$') == 1 && exists('b:NERDTree') && b:NERDTree.isTabTree() | quit | endif
autocmd BufWinEnter * if getcmdwintype() == '' | silent NERDTreeMirror | endif

autocmd FileType html,css EmmetInstall