title: Graphical diff viewer between local and repo file
body: <p>Here is my use case.
  I want to compare a local file i am working on with a repo file using a diff viewer.
  For example</p>
  
  <pre><code>file 1 : /path-to-local-file-in-my-computer
  file 2 : http://core.svn.wordpress.org/trunk/wp-load.php
  </code></pre>
  
  <p>Is there any program that can compare a file in my machine and a repo file in the internet??
  I want to edit, revert changes line by line comparing to files. Some thing like phpstorm diff viewer?</p>