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extensions: add notloaded method to return extensions failed to load

Before this patch, there is no easy way to detect if there are extensions
failed to load. While this is okay for most situations, chgserver is designed
to preload all extensions specified in config and does need the information.
This patch adds extensions.notloaded() to return names of extensions failed
to load.

#!/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()