title: How to automatically update tag file in vim?
body: <p>I use vim C++ tag file for navigation using Ctrl-]. The problem is whenever some file gets modified, the links are no longer valid and I have to re-run ctags and update the tag file. Our code base is huge and it takes quite a while for generating tag file. </p>
  
  <p>Is there any tool which periodically updates the tag file in background? Can I configure VIM to do the same?</p>
  
  <p>I use gvim under Windows.</p>