contrib/showstack.py

dispatch: add option to not strip command args parsed by _earlygetopt()

This allows us to parse the original args later by full-blown getopt() in
order to verify the result of the faulty early parsing. Still we need the
'strip=True' behavior for shell aliases.

Note that this series is RFC because it seems to change too much to be
included in stable release.

# showstack.py - extension to dump a Python stack trace on signal
#
# binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)

from __future__ import absolute_import
import signal
import sys
import traceback

def sigshow(*args):
    sys.stderr.write("\n")
    traceback.print_stack(args[1], limit=10, file=sys.stderr)
    sys.stderr.write("----\n")

def extsetup(ui):
    signal.signal(signal.SIGQUIT, sigshow)
    try:
        signal.signal(signal.SIGINFO, sigshow)
    except AttributeError:
        pass