How does mu know it crashed?

[Tinkering-Townsperson]

My question: How does the mu editor know it crashed? Is there some sort of library it uses to handle crashes?

[carlosperate]

You can use the sys.excepthook Python feature to capture uncaught exceptions:
https://docs.python.org/3/library/sys.html#sys.excepthook

You can see how it was implemented in Mu here:

mu/mu/app.py

Lines 168 to 198 in 0596a52

	def excepthook(*exc_args):
	"""
	Log exception and exit cleanly.
	"""
	logging.error("Unrecoverable error", exc_info=(exc_args))
	if exc_args[0] != KeyboardInterrupt:
	try:
	log_file = base64.standard_b64encode(LOG_FILE.encode("utf-8"))
	error = base64.standard_b64encode(
	"".join(traceback.format_exception(*exc_args)).encode("utf-8")
	)[-1800:]
	p = platform.uname()
	params = {
	"v": __version__, # version
	"l": str(i18n.language_code), # locale
	"p": base64.standard_b64encode(
	" ".join(
	[p.system, p.release, p.version, p.machine]
	).encode("utf-8")
	), # platform
	"f": log_file, # location of log file
	"e": error, # error message
	}
	args = urllib.parse.urlencode(params)
	webbrowser.open("https://codewith.mu/crash/?" + args)
	except Exception as e: # The Alamo of crash handling.
	logging.error("Failed to report crash", exc_info=e)
	sys.__excepthook__(*exc_args)
	sys.exit(1)
	else: # It's harmless, don't sound the alarm.
	sys.exit(0)

mu/mu/app.py

Line 234 in 0596a52

sys.excepthook = excepthook

[Tinkering-Townsperson]

Thank you!