I'm trying to write a function that will let me toggle a Netrw Explore window 
open/closed in the current window. Opening is easy, but closing (without 
killing the window/split) is a problem. Using <C-6> doesn't work if there's no 
alternate buffer, and my current implementation yields unpredictable results. 
Has anyone got an idea how I could pull this off? What I have so far, below:

fun! ExToggle(dir)
  if &filetype != "netrw"
    call ExOpen(a:dir)
  else
    call ExClose()
  endif
endf

fun! ExOpen(dir)
  exe "Explore " . a:dir
  let g:netrw_browse_split=0  " open files in current window
endf

fun! ExClose()
  while &filetype == "netrw"
    exe "normal! \<C-O>"
  endw
endf

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