title: Git: show total file size difference between two commits?
body: <p>Is it possible to show the total file size difference between two commits? Something like:</p>
  
  <pre><code>$ git file-size-diff 7f3219 bad418 # I wish this worked :)
  -1234 bytes
  </code></pre>
  
  <p>I’ve tried:</p>
  
  <pre><code>$ git diff --patch-with-stat
  </code></pre>
  
  <p>And that shows the file size difference for each <em>binary</em> file in the diff — but not for text files, and not the total file size difference.</p>
  
  <p>Any ideas?</p>