~abentley/bzrtools/bzrtools.dev

import bzrlib

from bzrlib import commands

from version import *

class BzrToolsCommand(commands.Command):

    def run_argv_aliases(self, argv, alias_argv=None):

        result = check_bzrlib_version(version_info[:2])

        if result is not None:

            return result

        commands.Command.run_argv_aliases(self, argv, alias_argv)

def check_bzrlib_version(desired):

    """Check that bzrlib is compatible.

    If version is < bzrtools version, assume incompatible.

    If version == bzrtools version, assume completely compatible

    If version == bzrtools version + 1, assume compatible, with deprecations

    Otherwise, assume incompatible.

    """

    desired_plus = (desired[0], desired[1]+1)

    bzrlib_version = bzrlib.version_info[:2]

    if bzrlib_version == desired or (bzrlib_version == desired_plus and

                                     bzrlib.version_info[3] == 'dev'):

        return

    try:

        from bzrlib.trace import warning

    except ImportError:

        # get the message out any way we can

        from warnings import warn as warning

    if bzrlib_version < desired:

        warning('Installed Bazaar version %s is too old to be used with'

                ' plugin \n'

                '"Bzrtools" %s.' % (

                bzrlib.__version__, '%s.%s.%s' % version_info))

        # Not using BzrNewError, because it may not exist.

        return 3

    else:

        warning('Plugin "Bzrtools" is not up to date with installed Bazaar'

                ' version %s.\n'

                'There should be a newer version of Bzrtools available, e.g.'

                ' %i.%i.'

                % (bzrlib.__version__, bzrlib_version[0], bzrlib_version[1]))

        if bzrlib_version != desired_plus:

            return 3