NERDTree crashes at Vim startup

[arg]

Environment

• Operating System: MacOS 10.14.5

• Vim version :version: 8.1

  More details

  VIM - Vi IMproved 8.1 (2018 May 18, compiled Jun  9 2019 07:22:39)
  macOS version
  Included patches: 1-1500
  Compiled by Homebrew
  Huge version without GUI.  Features included (+) or not (-):
  +acl               +conceal           +folding           +menu              +packages          -sun_workshop      +virtualedit
  +arabic            +cryptv            -footer            +mksession         +path_extra        +syntax            +visual
  +autocmd           +cscope            +fork()            +modify_fname      +perl              +tag_binary        +visualextra
  +autochdir         +cursorbind        +gettext           +mouse             +persistent_undo   -tag_old_static    +viminfo
  -autoservername    +cursorshape       -hangul_input      -mouseshape        +postscript        -tag_any_white     +vreplace
  -balloon_eval      +dialog_con        +iconv             +mouse_dec         +printer           -tcl               +wildignore
  +balloon_eval_term +diff              +insert_expand     -mouse_gpm         +profile           +termguicolors     +wildmenu
  -browse            +digraphs          +job               -mouse_jsbterm     -python            +terminal          +windows
  ++builtin_terms    -dnd               +jumplist          +mouse_netterm     +python3           +terminfo          +writebackup
  +byte_offset       -ebcdic            +keymap            +mouse_sgr         +quickfix          +termresponse      -X11
  +channel           +emacs_tags        +lambda            -mouse_sysmouse    +reltime           +textobjects       -xfontset
  +cindent           +eval              +langmap           +mouse_urxvt       +rightleft         +textprop          -xim
  -clientserver      +ex_extra          +libcall           +mouse_xterm       +ruby              +timers            -xpm
  +clipboard         +extra_search      +linebreak         +multi_byte        +scrollbind        +title             -xsmp
  +cmdline_compl     -farsi             +lispindent        +multi_lang        +signs             -toolbar           -xterm_clipboard
  +cmdline_hist      +file_in_path      +listcmds          -mzscheme          +smartindent       +user_commands     -xterm_save
  +cmdline_info      +find_in_path      +localmap          +netbeans_intg     +startuptime       +vartabs
  +comments          +float             +lua               +num64             +statusline        +vertsplit
  system vimrc file: "$VIM/vimrc"
  user vimrc file: "$HOME/.vimrc"
  2nd user vimrc file: "~/.vim/vimrc"
  user exrc file: "$HOME/.exrc"
  defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/local/share/vim"
  Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
  Linking: clang   -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o vim -lncurses -liconv -lintl -framework AppKit  -L/usr/local/opt/lua/lib -llua5.3 -mmacosx-version-min=10.14 -fstack-protector-strong -L/usr/local/lib  -L/usr/local/Cellar/perl/5.30.0/lib/perl5/5.30.0/darwin-thread-multi-2level/CORE -lperl -lm -lutil -lc  -L/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin -lpython3.7m -framework CoreFoundation -lruby.2.6
  

• NERDTree version git rev-parse --short HEAD: 28eb47e

• NERDTree settings applied in your vimrc, if any:

  " Auto open NERDTree
  autocmd StdinReadPre * let s:std_in=1
  autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | exe 'cd '.argv()[0] | endif
  
  " hide NERDTree on file open
  let NERDTreeQuitOnOpen = 1
  
  " do not display NERDTree help
  let NERDTreeMinimalUI = 1
  
  " Close Vim if only NERDTree buffer is on
  autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif

Process

1. Copy

   autocmd VimEnter * if argc() == 1 && isdirectory(argv()[0]) && !exists("s:std_in") | exe 'NERDTree' argv()[0] | wincmd p | ene | exe 'cd '.argv()[0] | endif

   from Readme and add it to ~/.vimrc
2. Open Vim (e.g. vim ~/dev/project)

Current Result

Vim crashes

NERD_tree_1
Error detected while processing function 188[2]..189[15]..216:
line   27:
E444: Cannot close last window
Press ENTER or type command to continue

After pressing Enter Vim continues to load.

Expected Result

Vim should start normally.

Screenshot(s)

Possible Fix

[edgard]

Same here, reverting commit from #999 fixes the behavior.

[jgeiger]

This doesn't crash neovim for me, but all windows now open minimized on the right of the screen. Reverting #999 seems to fix that issue as well.

[JediLuke]

Just chiming in that I too am getting this behaviour on Mac High Sierra using NeoVim. It doesnt crash for me though, I get the warning saying 'cannot close last window' but pressing enter makes it go away and then Neovim behaves normally and as expected

Reverting the commit also worked for me. To make life easier for the next person, this is how you do it:

cd ~/.vim/plugged
git checkout 67fa9b3

This will put you in detached HEAD state. If you're using this plugin there's a good chance you can use git so you know what that means. Restarting NeoVim worked for me though. Also your plugins directory may be different, you can see it in your init.vim file where you have declared all your plugins

[PhilRunninger]

@arg @edgard @jgeiger @JediLuke @thinker3

Can you all checkout PR #1001 for me. It works on my machine, but you know how that goes. The branch name is fix_999.

[edgard]

Yeah, with that branch it's working as expected. :)

[JediLuke]

Working for me too

[arg]

Working fine now, thanks!