set formatoptions+=1rnmBa

" Reformat lines (getting the spacing correct) {{{
fun! TeX_fmt()
    if (getline(".") != "")
    let save_cursor = getpos(".")
        let op_wrapscan = &wrapscan
        set nowrapscan
        let par_begin = '^\(%D\)\=\s*\($\|\\begin\|\\end\|\\\[\|\\\]\|\\\(sub\)*section\>\|\\item\>\|\\NC\>\|\\blank\>\|\\noindent\>\)'
        let par_end   = '^\(%D\)\=\s*\($\|\\start\|\\stop\|\\Start\|\\place\|\\\(sub\)*section\>\|\\item\>\|\\NC\>\|\\blank\>\)'
    try
      exe '?'.par_begin.'?+'
    catch /E384/
      1
    endtry
        norm V
    try
      exe '/'.par_end.'/-'
    catch /E385/
      $
    endtry
    norm gq
        let &wrapscan = op_wrapscan
    call setpos('.', save_cursor) 
    endif
endfun

nmap Q :call TeX_fmt()<CR>
" }}}