# peer.py - repository base classes for mercurial

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from i18n import _

import error

class peerrepository(object):

    def capable(self, name):

        '''tell whether repo supports named capability.

        return False if not supported.

        if boolean capability, return True.

        if string capability, return string.'''

        caps = self._capabilities()

        if name in caps:

            return True

        name_eq = name + '='

        for cap in caps:

            if cap.startswith(name_eq):

                return cap[len(name_eq):]

        return False

    def requirecap(self, name, purpose):

        '''raise an exception if the given capability is not present'''

        if not self.capable(name):

            raise error.CapabilityError(

                _('cannot %s; remote repository does not '

                  'support the %r capability') % (purpose, name))

    def local(self):

        '''return peer as a localrepo, or None'''

        return None

    def peer(self):

        return self

    def canpush(self):

        return True

    def close(self):

        pass