" Make the tab key useful {{{
function TabWrapper()
  if strpart(getline('.'), 0, col('.')-1) =~ '^\s*$'
      return "\<Tab>"
        elseif exists('&omnifunc') && &omnifunc != ''
            return "\<C-X>\<C-N>"
    else
      return "\<C-N>"
    endif
endfunction
imap <Tab> <C-R>=TabWrapper()<CR>
imap <C-cr> <C-x><C-o><C-p>