# -*- coding: utf-8 -*-
#
# Copyright (C) 2004-2009 Edgewall Software
# Copyright (C) 2004-2005 Jonas Borgström <jonas@edgewall.com>
# Copyright (C) 2004-2005 Daniel Lundin <daniel@edgewall.com>
# Copyright (C) 2005-2006 Christopher Lenz <cmlenz@gmx.de>
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://trac.edgewall.org/log/.
#
# Author: Jonas Borgström <jonas@edgewall.com>
#         Christopher Lenz <cmlenz@gmx.de>

import re

from genshi.builder import tag

from trac.core import *
from trac.loader import get_plugin_info
from trac.perm import IPermissionRequestor
from trac.util.translation import _
from trac.web import IRequestHandler
from trac.web.chrome import Chrome, INavigationContributor, add_stylesheet


class AboutModule(Component):
    """"About Trac" page provider, showing version information from
    third-party packages, as well as configuration information."""

    required = True

    implements(INavigationContributor, IPermissionRequestor, IRequestHandler)

    # INavigationContributor methods

    def get_active_navigation_item(self, req):
        return 'about'

    def get_navigation_items(self, req):
        yield ('metanav', 'about',
               tag.a(_('About Trac'), href=req.href.about()))

    # IPermissionRequestor methods

    def get_permission_actions(self):
        return ['CONFIG_VIEW']

    # IRequestHandler methods

    def match_request(self, req):
        return re.match(r'/about(?:_trac)?(?:/.+)?$', req.path_info)

    def process_request(self, req):
        data = {'systeminfo': None, 'plugins': None, 'config': None}

        if 'CONFIG_VIEW' in req.perm('config', 'systeminfo'):
            # Collect system information
            data['systeminfo'] = self.env.get_systeminfo()
            Chrome(self.env).add_jquery_ui(req)

        if 'CONFIG_VIEW' in req.perm('config', 'plugins'):
            # Collect plugin information
            data['plugins'] = get_plugin_info(self.env)

        if 'CONFIG_VIEW' in req.perm('config', 'ini'):
            # Collect config information
            defaults = self.config.defaults(self.compmgr)
            sections = []
            for section in self.config.sections(self.compmgr):
                options = []
                default_options = defaults.get(section, {})
                for name, value in self.config.options(section, self.compmgr):
                    default = default_options.get(name) or ''
                    options.append({
                        'name': name, 'value': value,
                        'modified': unicode(value) != unicode(default)
                    })
                options.sort(key=lambda o: o['name'])
                sections.append({'name': section, 'options': options})
            sections.sort(key=lambda s: s['name'])
            data['config'] = sections

        add_stylesheet(req, 'common/css/about.css')
        return 'about.html', data, None

@@ -1797,16 +1797,8 @@
 ac)?
-(?:/.+)?
 $', 

Modify regex after [4593] since we don't have to match paths that follow `/about` and `/about_trac`. Refs #11565.