Map Backspace to Exit VIM if on top left corner (beginning of buffer)

bs_to_exit.vim

" Exit Vim if Backspace key at beginning of unmodified buffer (top left)

" Very usefull if you use a terminal file explorer like Ranger 

" https://github.com/ranger/ranger

" you can just got into and out of files with Enter and Backspace keys. 

" Obviously will notify if buffer is modified and unsaved.

function! ExitAtBufferStart()
  if line('.') == 1 && col('.') == 1
    quit
  else
    execute "normal! \<BS>"
  endif
endfunction

nnoremap <silent> <BS> :call ExitAtBufferStart()<CR>