Delete buffer if last window, otherwise close window

gistfile1.vim

" Closes window if there are more windows opened to the same buffer.
" Otherwise deletes buffer.
fun! WinQuitOrBufDelete ()
  let win_cnt = 0

  for wnr in range(1, winnr("$"))
    if winbufnr(wnr) == bufnr("%")
      let win_cnt += 1
    endif

    if win_cnt == 2
      close
      return
    endif
  endfor

  bd
endf

function! CloseBuffer()
  let references = 0
  for window in range(1, winnr("$"))
    let references += (winbufnr(window) == bufnr("%")) ? 1 : 0

    if references == 2
        echo 'hiding the window'
        return
    endif
  endfor
  echo 'deleting this buffer'
endfunction

function! CloseBuffer()
  if len(filter(range(1,winnr('$')), 'v:val != bufnr("%")')) > 1
    echom 'hiding the window'
  else
    echom 'deleting this buffer'
  endif
endfunction