Handling the GURL event triggered by OSX when it handles a URL scheme registered to an application.

gistfile1.py

import objc

NSAppleEventManager = objc.lookUpClass('NSAppleEventManager')
NSObject = objc.lookUpClass('NSObject')

class GURLHandler(NSObject):
    def handleEvent_withReplyEvent_(self, event, reply_event):
        url = event.descriptorForKeyword_(fourCharToInt('----')).stringValue()
        # Do something with the url

# A helper to make struct since cocoa headers seem to make
# it impossible to use kAE* 
fourCharToInt = lambda code: struct.unpack('>l', code)[0]

manager = NSAppleEventManager.sharedAppleEventManager()

manager.setEventHandler_andSelector_forEventClass_andEventID_(
    GURLHandler.alloc(), 'handleEvent:withReplyEvent:',
    fourCharToInt('GURL'), fourCharToInt('GURL')
)