Toggle display of current div in statusline

gistfile1.vim

let s:orig_statusline = &statusline

function! HTMLCurrentDivId()
  let m = searchpos('<\s*div.\{-}id\s*=\s*"\([^"]*\)"', 'bnWp')
  if m[2] == 2
    return matchlist(getline(m[0]), 'id\s*=\s*"\([^"]*\)"')[1]
  else
    return ''
  endif
endfunction

function! ToggleStatusLineCurrentDiv()
  if s:orig_statusline == &statusline
    let statusline = &statusline.' \%{HTMLCurrentDivId()}'
  else
    let statusline = s:orig_statusline
  endif
  exe "set statusline=".escape(statusline, ' ')
endfunction

nnoremap <silent> <leader>x :call ToggleStatusLineCurrentDiv()<cr>