kill buffer, keep window (vim)

gistfile1.vim

" delete buffer, keep window
function Kwbd(kwbdStage)
 if(a:kwbdStage == 1)
   let g:kwbdBufNum = bufnr("%")
   let g:kwbdWinNum = winnr()
   windo call Kwbd(2)
   execute "bd! " . g:kwbdBufNum
   execute "normal " . g:kwbdWinNum . ""
 else
   if(bufnr("%") == g:kwbdBufNum)
     let prevbufvar = bufnr("#")
     if(prevbufvar > 0 && buflisted(prevbufvar) && prevbufvar != g:kwbdBufNum)
       b #
     else
       bn
     endif
   endif
 endif
endfunction
map <C-w><C-k> :call Kwbd(1)<CR>