for rc in /etc/bash_completion /usr/local/share/bash-completion/bash_completion /usr/share/bash-completion/bash_completion ; do
  if [ -f "$rc" ] ; then
    . "$rc"
  fi
done
unset rc

if [ -d /usr/local/etc/bash_completion.d ] ; then
  for rc in /usr/local/etc/bash_completion.d/* ; do
    if [ -f "$rc" ] ; then
      . "$rc"
    fi
  done
fi
unset rc

complete -cf sudo