function! Align_bl(slnum, elnum, line_len)
    let i = a:slnum
    while i <= a:elnum
        let current_line = getline(i)
        let current_line_len = strlen(current_line)
        let space_len = a:line_len - current_line_len - 1
        let new_line = current_line . repeat(" ", space_len) . "\\"
        call setline(i, new_line)
        let i += 1
    endwhile
endfunction