Vim with NERDTree Adequate Defaults

.bashrc

# I love super fast keyboard. Most of my friends and colleagues can't follow
# I use `atkbd.softrepeat=1` on the kernel command line.
# Even Visual Assist plugin in Visual Studio doubles keyboard repeat rate with _a reason_.
# I'm working on my laptop without X installed to avoid procrastination.
# I've spend a working day googling how to make `kbdrate` using slower delay than 250.
# Add this to your /etc/profile.d/kbdrate.sh: sudo kbdrate -r 82 -d 150 if you want it in console.
# Note that it will force you type password twice. I didn't find any workarounds.
xset r rate 150 82

# When exiting from Vim, just type
#   v filename
# and Ctrl+k after Vim shows up
# to open that file from any directory or default location
v() {
    vim_id=`jobs|sed -n "/vim/s/\[\([0-9]\)\]+.*/\1/p"`
    vim_pid=`jobs -p $vim_id`
    file_name=$@
    file_path=`realpath $file_name` 
    echo "e $file_path"
    if [ -n "$vim_id" ]; then
        echo "e $file_path" > $HOME/.vim-swap-$vim_pid && fg $vim_id
    else
        vim $@
    fi
}

.vimrc

" Enables Pathogen
execute pathogen#infect()

" Preserve scroll position when switching between buffers
au BufLeave * if !&diff | let b:winview = winsaveview() | endif
au BufEnter * if exists('b:winview') && !&diff | call winrestview(b:winview) | unlet! b:winview | endif


" Switch between NERDTree and opened file
:nmap \e :wincmd w<CR>

" Create new file in the same folder where current edited file is located
:nmap <C-N> :wincmd w<CR>ma

" Delete current file
:nmap <C-D> :wincmd w<CR>md

" Switch between opened windows
:nmap <Tab> :bp<CR>

" Close current buffer
:nmap <expr> \q len(filter(range(1, bufnr('$')), 'buflisted(v:val)')) == 1 ? ':qa<CR>' : ':bp<CR>:bd #<CR>'

" Prevent Tab on NERDTree (breaks everything otherwise)
autocmd FileType nerdtree noremap <buffer> <Tab> <nop>


" Restore cursor position
au BufReadPost *
  \ if line("'\"") > 0 && line("'\"") <= line("$") && &filetype != "gitcommit" |
    \ execute("normal `\"") |
  \ endif

" calls NERDTreeFind iff NERDTree is active, current window contains a modifiable file, and we're not in vimdiff
function! s:syncTree()
  let s:curwnum = winnr()
  NERDTreeFind
  exec s:curwnum . "wincmd w"
endfunction

function! s:syncTreeIf()
  if (winnr("$") > 1)
    call s:syncTree()
  endif
endfunction
  
" Shows NERDTree on start and synchronizes the tree with opened file when switching between opened windows
autocmd BufEnter * call s:syncTreeIf()
  
  
" Automatically close vim if only NERDTree left
autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif
  
" Focus on opened view after starting (instead of NERDTree)
autocmd VimEnter * call s:syncTree()
au VimEnter * :wincmd w

" Auto refresh NERDTree files
autocmd CursorHold,CursorHoldI * if (winnr("$") > 1) | call NERDTreeFocus() | call g:NERDTree.ForCurrentTab().getRoot().refresh() | call g:NERDTree.ForCurrentTab().render() | wincmd w | endif
  
  
  
" Show/Hide NERDTree
:nmap <expr> \a (winnr("$") == 1) ? ':NERDTreeFind<CR>' : ':wincmd o<CR>'
" Prevent this command activation in NERDTree
autocmd FileType nerdtree noremap <buffer> \a <nop>



" Load file specified in bash after switching to background using Ctrl+Z
" Works in conjuction with .bashrc script:
"  v() {
"    vim_id=`jobs|sed -n "/vim/s/\[\([0-9]\)\]+.*/\1/p"`
"    vim_pid=`jobs -p $vim_id`
"    file_name=$@
"    file_path=`realpath $file_name` 
"    echo "e $file_path"
"    if [ -n "$vim_id" ]; then
"        echo "e $file_path" > $HOME/.vim-swap-$vim_pid && fg $vim_id                                                                                                                                                                                                                                                           
"    else
"        vim $@
"    fi
"  }
function! s:loadCtrlZFile()
  let cs = $HOME . "/.vim-swap-" . getpid()
  let quotedcs = "\"" . cs . "\""
  if filereadable(cs)
    exec 'source ' . cs
    exec 'call delete(' . quotedcs . ')'
  endif
endfunction

:nmap <C-k> :call <SID>loadCtrlZFile()<CR>

Note that it breaks opening a directory in tree view.

For those who wants to try alternative approach,
can start managing jobs in your console.

Remember command Ctrl + Z, to return just type fg.
You can run a lot of processes this way. Just type jobs to get numbers, and fg 1 / fg 2 etc. to get back.

With Ctrl + z it seems that you don't need NERDTree too much.
Interesting is how to send a file as a buffer from command line into already opened vim:
https://stackoverflow.com/questions/5999837/how-to-open-another-file-in-background-vim-from-bash-command-line

https://serverfault.com/questions/188936/writing-to-stdin-of-background-process

Very helpful.. thanks

The config for syncing the nerdtree works well in most of the cases but it messed up everything when I used coc.nvim go to references functionality. using BufRead event in place of the BufEnter fixed the issue.