"Test harness for doctests."

# pylint: disable-msg=E0611,W0142

__metaclass__ = type
__all__ = [
    'additional_tests',
    ]

import atexit
import doctest
import os
from pkg_resources import (
    resource_filename, resource_exists, resource_listdir, cleanup_resources)
import unittest

DOCTEST_FLAGS = (
    doctest.ELLIPSIS |
    doctest.NORMALIZE_WHITESPACE |
    doctest.REPORT_NDIFF)


def additional_tests():
    "Run the doc tests (README.txt and docs/*, if any exist)"
    doctest_files = [
        os.path.abspath(resource_filename('beautifulsoup', 'README.txt'))]
    if resource_exists('beautifulsoup', 'docs'):
        for name in resource_listdir('beautifulsoup', 'docs'):
            if name.endswith('.txt'):
                doctest_files.append(
                    os.path.abspath(
                        resource_filename('beautifulsoup', 'docs/%s' % name)))
    kwargs = dict(module_relative=False, optionflags=DOCTEST_FLAGS)
    atexit.register(cleanup_resources)
    return unittest.TestSuite((
        doctest.DocFileSuite(*doctest_files, **kwargs)))