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" http://vim.wikia.com/wiki/VimTip1369
" Preserve noeol (missing trailing eol) when saving file. In order
" to do this we need to temporarily 'set binary' for the duration of
" file writing, and for DOS line endings, add the CRs manually.
" For Mac line endings, also must join everything to one line since it doesn't
" use a LF character anywhere and 'binary' writes everything as if it were Unix.

" This works because 'eol' is set properly no matter what file format is used,
" even if it is only used when 'binary' is set.

augroup automatic_noeol
au!

au BufWritePre  * call TempSetBinaryForNoeol()
au BufWritePost * call TempRestoreBinaryForNoeol()

fun! TempSetBinaryForNoeol()
    let s:save_binary = &binary
    if ! &eol && ! &binary
        setlocal binary
        if &ff == "dos" || &ff == "mac"
            undojoin | silent 1,$-1s#$#\=nr2char(13)
        endif
        if &ff == "mac"
            let s:save_eol = &eol
            undojoin | %join!
            " mac format does not use a \n anywhere, so don't add one when writing in
            " binary (uses unix format always)
            setlocal noeol
        endif
    endif
endfun

fun! TempRestoreBinaryForNoeol()
    if ! &eol && ! s:save_binary
        if &ff == "dos"
            undojoin | silent 1,$-1s/\r$/
        elseif &ff == "mac"
            undojoin | %s/\r/\r/g
            let &l:eol = s:save_eol
        endif
        setlocal nobinary
    endif
endfun

augroup END