vimscript that maximizes the current window without resizing the quickfix window

maximize_without_resizing_quickfix.vim

" this just sets the current window to the specified number
"
" i think this is what really slows things down
function SetCurWinNr(tot, nr)
  exe a:tot . ' winc k'
  if a:nr > 1
    exe (a:nr-1) . ' winc j'
  endif
endfunction

" this maximizes the current window without resizing the quickfix window
function MaximizeWithoutResizingQuickfix()
  " disable stuff to make this faster
  set lazyredraw
  set ei=WinEnter

  let qfwinnr = -1        " quickfix window number
  let tot = 0             " total number of windows
  let curwinnr = winnr()  " current window number

  " this uses the one loop to get the quickfix window number and the total
  " number of windows
  windo let qfwinnr = getbufvar(winbufnr(winnr()), "&buftype") == "quickfix"? winnr() : -1 | let tot += 1
  
  " :windo sets the current window to the last one, so go back to where we
  " started
  call SetCurWinNr(tot, curwinnr)

  " we only need to do anything if we're NOT entering the quickfix window
  if qfwinnr != curwinnr

    " maximize this window
    winc _

    if qfwinnr > -1
      let qfheight = winheight(qfwinnr)
      call SetCurWinNr(tot, qfwinnr)
      exe 'resize ' . qfheight
      call SetCurWinNr(tot, curwinnr)
    endif

  endif

  " re-enable stuff
  set ei-=WinEnter
  set nolazyredraw
endfunction

version2.vim

if !exists("*SetCurWinNr")
  function SetCurWinNr(tot, nr)
    exe a:tot . ' winc k'
    if a:nr > 1
      exe (a:nr-1) . ' winc j'
    endif
  endfunction
endif

if !exists("*MaximizeWithoutResizingQuickfix")
  function MaximizeWithoutResizingQuickfix()
    " disable stuff to make this faster
    let g:jshint_disabled=1
    set lazyredraw
    set ei=WinEnter

    let qfwinnr = -1
    let tot = 0
    let curwinnr = winnr()

    windo let qfwinnr = getbufvar(winbufnr(winnr()), "&buftype") == "quickfix"? winnr() : -1 | let tot += 1
    
    if qfwinnr > -1
      let qfheight = winheight(qfwinnr)
    endif

    " this takes us back to the original window
    call SetCurWinNr(tot, curwinnr)

    if qfwinnr != curwinnr
      " maximize this window
      winc _

      if qfwinnr > -1
        call SetCurWinNr(tot, qfwinnr)
        exe 'resize ' . qfheight
        call SetCurWinNr(tot, curwinnr)
      endif

      " re-enable stuff
      set ei-=WinEnter
      set nolazyredraw
      let g:jshint_disabled=0
    endif
  endfunction
endif

the whole purpose of this script is to maximize the current window without touching the quickfix window. if there's a better way, i'd love to hear it.

My approach: https://gist.github.com/3344530