#
#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
View classes for versioning.

$Id$
"""

from zope import interface, component
from zope.app.pagetemplate import ViewPageTemplateFile
from zope.app.security.interfaces import IUnauthenticatedPrincipal
from zope.cachedescriptors.property import Lazy

from loops.browser.common import BaseView
from loops.versioning.interfaces import IVersionable
from loops.versioning.util import getVersion


version_macros = ViewPageTemplateFile('version_macros.pt')


class ListVersions(BaseView):

    template = version_macros

    @Lazy
    def macro(self):
        return self.template.macros['versions']

    def versions(self):
        versionable = IVersionable(self.context)
        versions = versionable.versions
        for v in sorted(versions):
            yield BaseView(versions[v], self.request)