set_backup_dir.vim

" dont backup anything if vim launched with root priveleges
if $USER != 'root'
    " create and set backup, swap and undo directories
    let s:tmp_path = '/tmp/vim_temp/' . $USER . '/'
    if ! filewritable(s:tmp_path)
      silent execute '!mkdir -p "' . s:tmp_path . '"'
    else
      " remove backups older than 8 days (-ctime +8)
      silent execute '!find "' . s:tmp_path . '" -type f -ctime +8 -delete'
    endif
    au BufWritePre * let &bex = '-' . strftime("%Y.%m.%dT%H:%M:%S") . '~'

    " double slash in the end of path used to avoid conflicts
    " between files with equal names (swap and undo files names will contains full path to the file)
    let &directory = s:tmp_path . '/'
    let &backupdir = s:tmp_path
    set backup
    let &undodir = s:tmp_path . '/'
    set udf
endif