def critique(ui, repo, entire=False, node=None, **kwargs):
    """Perform a critique of a changeset."""
    demandimport.disable()

    from flake8.engine import get_style_guide
    from pep8 import DiffReport, parse_udiff

    style = get_style_guide(parse_argv=False, ignore='E128')

    ctx = repo[node]

    if not entire:
        diff = ''.join(ctx.diff())
        style.options.selected_lines = {}
        for k, v in parse_udiff(diff).items():
            if k.startswith('./'):
                k = k[2:]

            style.options.selected_lines[k] = v

        style.options.report = DiffReport(style.options)

    deleted = repo.status(ctx.p1().node(), ctx.node())[2]
    files = [f for f in ctx.files() if f.endswith('.py') and f not in deleted]
    style.check_files(files)

    demandimport.enable()

def launch_browser(ui, request_url):
    # not all python installations have the webbrowser module
    from mercurial import demandimport
    demandimport.disable()
    try:
        import webbrowser
        webbrowser.open(request_url)
    except:
        ui.status('unable to launch browser - webbrowser module not available.')

    demandimport.enable()

def hgweb_handler(environ, start_response):
    from mercurial import demandimport; demandimport.enable()
    #from mercurial.hgweb.hgwebdir_mod import hgwebdir
    #from mercurial.hgweb.request import wsgiapplication
    from mercurial.hgweb import hgweb
     
    hgweb_conf = '/etc/mercurial/hgweb.conf'
    #make_web_app = hgwebdir(hgweb_conf)
    hg_webapp = hgweb(hgweb_conf)
     
    #hg_webapp = wsgiapplication(make_web_app)
    return hg_webapp(environ, start_response)

import sys, os.path, re
from datetime import datetime
import time
from math import ceil

sys.path.append(os.path.dirname(__file__))

demandimport.disable()
from parsedatetime import parsedatetime as pdt

try:
    import sqlite3 as sqlite
except ImportError:
    from pysqlite2 import dbapi2 as sqlite
demandimport.enable()

testedwith = '3.6'

cal = pdt.Calendar()
PUSHES_PER_PAGE = 10

def addcommand(f, name):
    setattr(hgwebprotocol, name, f)
    hgwebprotocol.__all__.append(name)

def addwebcommand(f, name):
    setattr(hgwebcommands, name, f)
    hgwebcommands.__all__.append(name)

ATOM_MIMETYPE = 'application/atom+xml'

import sys

# Adjust python path if this is not a system-wide install
#sys.path.insert(0, r'c:\path\to\python\lib')

# Enable tracing. Run 'python -m win32traceutil' to debug
if getattr(sys, 'isapidllhandle', None) is not None:
    import win32traceutil

# To serve pages in local charset instead of UTF-8, remove the two lines below
import os
os.environ['HGENCODING'] = 'UTF-8'


import isapi_wsgi
from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb.hgwebdir_mod import hgwebdir

# Example tweak: Replace isapi_wsgi's handler to provide better error message
# Other stuff could also be done here, like logging errors etc.
class WsgiHandler(isapi_wsgi.IsapiWsgiHandler):
    error_status = '500 Internal Server Error' # less silly error message

isapi_wsgi.IsapiWsgiHandler = WsgiHandler

# Only create the hgwebdir instance once
application = hgwebdir(hgweb_config)

def handler(environ, start_response):

    # Translate IIS's weird URLs

    def add_domain(a,b): 
        pass

hg_import_error = []
try:
    # The new `demandimport` mechanism doesn't play well with code relying
    # on the `ImportError` exception being caught.
    # OTOH, we can't disable `demandimport` because mercurial relies on it
    # (circular reference issue). So for now, we activate `demandimport`
    # before loading mercurial modules, and desactivate it afterwards.
    #
    # See http://www.selenic.com/mercurial/bts/issue605
    
    try:
        from mercurial import demandimport
        demandimport.enable();
    except ImportError, hg_import_error:
        demandimport = None

    from mercurial import hg
    from mercurial.context import filectx
    from mercurial.ui import ui
    from mercurial.node import hex, short, nullid
    from mercurial.util import pathto, cachefunc
    from mercurial import cmdutil
    from mercurial import extensions
    from mercurial.extensions import loadall

    # Note: due to the nature of demandimport, there will be no actual 
    # import error until those symbols get accessed, so here we go:
    for sym in ("filectx ui hex short nullid pathto "