Github style flavored markdown

        :param text:

        """

        # Extract pre blocks.

        extractions = {}

        def pre_extraction_callback(matchobj):

            digest = hashlib.sha1(matchobj.group(0)).hexdigest()

            extractions[digest] = matchobj.group(0)

            return "{gfm-extraction-%s}" % digest

        pattern = re.compile(r'<pre>.*?</pre>', re.MULTILINE | re.DOTALL)

        text = re.sub(pattern, pre_extraction_callback, text)

        # Prevent foo_bar_baz from ending up with an italic word in the middle.

        def italic_callback(matchobj):

            s = matchobj.group(0)

            if list(s).count('_') >= 2:

                return s.replace('_', r'\_')

            return s

        text = re.sub(r'^(?! {4}|\t)\w+_\w+_\w[\w_]*', italic_callback, text)

        # In very clear cases, let newlines become <br /> tags.

        def newline_callback(matchobj):

            if len(matchobj.group(1)) == 1:

                return matchobj.group(0).rstrip() + '  \n'

            else:

                return matchobj.group(0)

        pattern = re.compile(r'^[\w\<][^\n]*(\n+)', re.MULTILINE)

        text = re.sub(pattern, newline_callback, text)

        # Insert pre block extractions.

        def pre_insert_callback(matchobj):

            return '\n\n' + extractions[matchobj.group(1)]

        text = re.sub(r'{gfm-extraction-([0-9a-f]{32})\}',

                      pre_insert_callback, text)

        return text

    @classmethod

    def render(cls, source, filename=None):

        """

        Renders a given filename using detected renderer

        it detects renderers based on file extension or mimetype.

        At last it will just do a simple html replacing new lines with <br/>

        >>> MarkupRenderer.render('''<img id="a" style="margin-top:-1000px;color:red" src="http://example.com/test.jpg">''', '.md')

        >>> MarkupRenderer.render('''<img class="c d" src="file://localhost/test.jpg">''', 'b.mkd')

        '<p><img class="c d"></p>'

        >>> MarkupRenderer.render('''<a href="foo">foo</a>''', 'c.mkdn')

        '<p><a href="foo">foo</a></p>'

        >>> MarkupRenderer.render('''<script>alert(1)</script>''', 'd.mdown')

        '<script>alert(1)</script>'

        >>> MarkupRenderer.render('''<div onclick="alert(2)">yo</div>''', 'markdown')

        '<div>yo</div>'

        >>> MarkupRenderer.render('''<a href="javascript:alert(3)">yo</a>''', 'md')

        '<p><a>yo</a></p>'

        """

        renderer = cls._detect_renderer(source, filename)

        readme_data = renderer(source)

        # Allow most HTML, while preventing XSS issues:

        # no <script> tags, no onclick attributes, no javascript

        # "protocol", and also limit styling to prevent defacing.

        return bleach.clean(readme_data,

            tags=['a', 'abbr', 'b', 'blockquote', 'br', 'code', 'dd',

                  'div', 'dl', 'dt', 'em', 'h1', 'h2', 'h3', 'h4', 'h5',

                  'h6', 'hr', 'i', 'img', 'li', 'ol', 'p', 'pre', 'span',

                  'strong', 'sub', 'sup', 'table', 'tbody', 'td', 'th',

                  'thead', 'tr', 'ul'],

            attributes=['class', 'id', 'style', 'label', 'title', 'alt', 'href', 'src'],

            styles=['color'],

            protocols=['http', 'https', 'mailto'],

            )

    @classmethod

    def plain(cls, source, universal_newline=True):

        """

        >>> MarkupRenderer.plain('https://example.com/')

        '<br /><a href="https://example.com/">https://example.com/</a>'

        """

        if universal_newline:

            newline = '\n'

            source = newline.join(source.splitlines())

        def url_func(match_obj):

            url_full = match_obj.group(0)

            return '<a href="%(url)s">%(url)s</a>' % ({'url': url_full})

        source = webutils.url_re.sub(url_func, source)

        return '<br />' + source.replace("\n", '<br />')

    @classmethod

    def markdown(cls, source, safe=True, flavored=False):

        """

        Convert Markdown (possibly GitHub Flavored) to INSECURE HTML, possibly

    matches = re.compile(r'(?:%s)\s*=\s*(.*)' % name).search(data)

    if matches:

        s = eval(matches.groups()[0])

        if callable(callback_handler):

            return callback_handler(s)

        return s

_meta = open(os.path.join(here, 'kallithea', '__init__.py'), 'r')

_metadata = _meta.read()

_meta.close()

def callback(V):

    return '.'.join(map(str, V[:3])) + '.'.join(V[3:])

__version__ = _get_meta_var('VERSION', _metadata, callback)

__license__ = _get_meta_var('__license__', _metadata)

__author__ = _get_meta_var('__author__', _metadata)

__url__ = _get_meta_var('__url__', _metadata)

# defines current platform

__platform__ = platform.system()

is_windows = __platform__ in ['Windows']

requirements = [

    "alembic >= 1.0.10, < 1.5",

    "gearbox >= 0.1.0, < 1",

    "waitress >= 0.8.8, < 1.5",

    "WebOb >= 1.8, < 1.9",

    "backlash >= 0.1.2, < 1",

    "TurboGears2 >= 2.4, < 2.5",

    "tgext.routes >= 0.2.0, < 1",

    "Beaker >= 1.10.1, < 2",

    "WebHelpers2 >= 2.0, < 2.1",

    "FormEncode >= 1.3.1, < 2.1",

    "SQLAlchemy >= 1.2.9, < 1.4",

    "Mako >= 0.9.1, < 1.2",

    "Pygments >= 2.2.0, < 2.7",

    "Whoosh >= 2.7.1, < 2.8",

    "celery >= 5, < 5.1",

    "Babel >= 1.3, < 2.9",

    "python-dateutil >= 2.1.0, < 2.9",

    "Markdown >= 2.2.1, < 3.2",

    "docutils >= 0.11, < 0.17",

    "URLObject >= 2.3.4, < 2.5",

    "Routes >= 2.0, < 2.5",

    "dulwich >= 0.19.0, < 0.20",

    "mercurial >= 5.2, < 5.9",

    "decorator >= 4.2.1, < 4.5",

    "Paste >= 2.0.3, < 3.5",

    "Click >= 7.0, < 8",

    "ipaddr >= 2.2.0, < 2.3",

    "paginate >= 0.5, < 0.6",

    "paginate_sqlalchemy >= 0.3.0, < 0.4",

    "bcrypt >= 3.1.0, < 3.2",

    "pip >= 20.0, < 999",

    "chardet >= 3",

]

dependency_links = [

]

classifiers = [

    'Development Status :: 4 - Beta',

    'Environment :: Web Environment',

    'Framework :: Pylons',

    'Intended Audience :: Developers',

    'License :: OSI Approved :: GNU General Public License (GPL)',

    'Operating System :: OS Independent',

    'Programming Language :: Python :: 3.6',

    'Programming Language :: Python :: 3.7',

    'Programming Language :: Python :: 3.8',

    'Topic :: Software Development :: Version Control',

]

# additional files from project that goes somewhere in the filesystem

# relative to sys.prefix

data_files = []

description = ('Kallithea is a fast and powerful management tool '

               'for Mercurial and Git with a built in push/pull server, '

               'full text search and code-review.')

keywords = ' '.join([

    'kallithea', 'mercurial', 'git', 'code review',

    'repo groups', 'ldap', 'repository management', 'hgweb replacement',

    'hgwebdir', 'gitweb replacement', 'serving hgweb',

])

# long description

README_FILE = 'README.rst'

try:

    long_description = open(README_FILE).read()

except IOError as err:

    sys.stderr.write(

        "[WARNING] Cannot find file specified as long_description (%s): %s\n"

        % (README_FILE, err)