use ranger as file chooser for vim

.vimrc

function! RangeChooser()
    let temp = tempname()
    exec 'silent !ranger --choosefile=' . shellescape(temp)
    " exec 'silent !ranger --choosefiles=' . shellescape(temp)
    if !filereadable(temp)
        redraw!
        return
    endif
    let names = readfile(temp)
    if empty(names)
        redraw!
        return
    endif
    exec 'edit ' . fnameescape(names[0])
    for name in names[1:]
        exec 'argadd ' . fnameescape(name)
    endfor
    redraw!
endfunction
command! -bar RangerChooser call RangeChooser()
nnoremap <leader>r :<C-U>RangerChooser<CR>