VirtualBox macOS keyswap for alt and cmd

vmboxkeyswap.py

#!/usr/bin/python

# Fixes the macOS keymap on the host to swap Alt & Cmd
# This allows for proper key location when using Virtual Machines under VirtualBox
# Support for Vmware and Parallels can easily be added via the app names
# Also Virtualbox does not detect the keyswap initially, so another app has to
# steal focus and then return focus to VirtualBox. Unknown if the same applies
# to the other VM solutions.

from AppKit import NSWorkspace
import os
from datetime import datetime
from time import sleep

vmkeyswap = '/usr/bin/hidutil property --set \'{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x7000000e7,"HIDKeyboardModifierMappingDst":0x7000000e6},{"HIDKeyboardModifierMappingSrc":0x7000000e6,"HIDKeyboardModifierMappingDst":0x7000000e7},{"HIDKeyboardModifierMappingSrc":0x7000000e3,"HIDKeyboardModifierMappingDst":0x7000000e2},{"HIDKeyboardModifierMappingSrc":0x7000000e2,"HIDKeyboardModifierMappingDst":0x7000000e3}]}\''
vmkeyswapUndo = '/usr/bin/hidutil property --set \'{"UserKeyMapping":[]}\''
actSI = '/usr/bin/osascript -e \'tell application "System Information" to activate\' -e \'delay 0.1\' -e \'tell application "System Information" to quit\' -e \'tell application "VirtualBox VM" to activate\''

last_active = None
autoswap = 0
while True:
	active = NSWorkspace.sharedWorkspace().activeApplication()
	if active:
		if active['NSApplicationName'] != last_active:
			prior_app = str(last_active)
			last_active = active['NSApplicationName']

			print active['NSApplicationName'] + ' ' + prior_app + ' ' + str(autoswap)

			if prior_app == 'VirtualBox VM' and autoswap == 1:
# 				print 'autoswap ' + str(autoswap)
# 				print 'We will run the undo script here ' + active['NSApplicationName'] + ' ' + prior_app
				os.system(vmkeyswapUndo)
				autoswap = 0

			if active['NSApplicationName'] == 'VirtualBox VM' and prior_app != 'System Information':
# 				print 'We will run the script here'
				os.system(vmkeyswap)
				os.system(actSI)
				autoswap = 1
	else:
		if last_active:
			print '%s: %s' % (
				datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
				'*** no active app ***'
			)
			last_active = None
	sleep(0.05)