title: Adding a script to MacOS finder contextual menu
body: <p>I want to add an option to the finder context menu that calls <code>hg add %1</code> with %1 being the full path of the selected file in finder.<br>
  Of course there are more useful cases I can think of, to add to the context menu.<br>
  Is there a simple way to do that which doesn't involve installing any 3rd party software or coding in a compiled language and building binary plugins?<br>
  Like creating a script with the script editor and dropping it in <code>/Library/Contextual Menu Items/</code> ?</p>