title: How to Write OS X Finder plugin
body: <p>I'm looking for a guide or sample code for writing Mac OS X Finder plugins?  It would like to know how to do some simple actions:</p>
  
  <ol>
  <li>adding image overlayers to icons</li>
  <li>adding context menu items</li>
  <li>listen to file changes</li>
  </ol>
  
  <p>I found the following two resources:</p>
  
  <ul>
  <li><a href="http://www.mactech.com/articles/mactech/Vol.18/18.08/MenuPlugins/index.html" rel="noreferrer">Writing Contextual Menu Plugins for OS X</a>: An outdated document from 2002 that uses the <code>COM</code> API targeting Mac OS X 8/9.</li>
  <li><a href="http://scplugin.tigris.org/" rel="noreferrer">SCPlugin</a>: Open-source SVN Mac application that includes a Finder plug-in.</li>
  </ul>
  
  <p>I am tempted to review the <code>SCPlugin</code> code, but was hoping to find an easier sample to digest.</p>