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demandimport: blacklist sqlalchemy.events as it has side effects (issue5085)

Importing sqlalchemy.events cannot be delayed as it registers classes to
their event mechanism. It worked fine before 4f1144c3c72b, since they use
new-style imports. But now we have to blacklist it because our demandimport
can handle new-style imports.

This patch series isn't intended for stable as we don't guarantee API
compatibility with 3rd-party extensions. They can temporarily disable the
demand importer to work around the issue.

#!/usr/bin/env python
#
# docchecker - look for problematic markup
#
# Copyright 2016 timeless <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import sys
import re

leadingline = re.compile(r'(^\s*)(\S.*)$')
hg_backtick = re.compile(r""":hg:`[^`]*'[^`]*`""")
hg_cramped = re.compile(r'\w:hg:`')

def check(line):
    if hg_backtick.search(line):
        print(line)
        print("""warning: please avoid nesting ' in :hg:`...`""")
    if hg_cramped.search(line):
        print(line)
        print('warning: please have a space before :hg:')

def work(file):
    (llead, lline) = ('', '')

    for line in file:
        # this section unwraps lines
        match = leadingline.match(line)
        if not match:
            check(lline)
            (llead, lline) = ('', '')
            continue

        lead, line = match.group(1), match.group(2)
        if (lead == llead):
            if (lline != ''):
                lline += ' ' + line
            else:
                lline = line
        else:
            check(lline)
            (llead, lline) = (lead, line)
    check(lline)

def main():
    for f in sys.argv[1:]:
        try:
            with open(f) as file:
                work(file)
        except BaseException as e:
            print("failed to process %s: %s" % (f, e))

main()