title: how to see changed lines of code between 2 branches for specific file type?
body: <p>I want to create a metric that shows me "changed lines of code" per "Bug" between two  Versions (in my case branches in git).</p>
  
  <p>Because our application has a lot of .swf files, I don't need to count those swf's files and I just want to count the java, xml and so on.</p>
  
  <p>Is there some kind of tool who does that? or a git command like <code>git diff --stat</code> for a specific file type?</p>