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#!/usr/bin/python -S
#
# Copyright 2009 Canonical Ltd.  This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).

# pylint: disable-msg=W0403

"""List the stacked branches in Launchpad.

Usage: ./get-stacked-on-branches.py

Prints the stacked branches in Launchpad to standard output in the following
format:
  <id> <branch_type> <unique_name> <stacked_on_unique_name>

<id> is the database ID of the Branch as a decimal integer.
<branch_type> is the name of the BranchType, e.g. 'HOSTED'.
<unique_name> is the unique_name property of the Branch.
<stacked_on_unique_name> is the unique_name property of the Branch.stacked_on
    branch.

This script is intended to be used in conjunction with "update-stacked-on.py".
"""

__metaclass__ = type

import _pythonpath

from storm.locals import Not
from zope.component import getUtility

from canonical.launchpad.scripts import execute_zcml_for_scripts
from canonical.launchpad.webapp.interfaces import (
    IStoreSelector, MAIN_STORE, SLAVE_FLAVOR)


def get_stacked_branches():
    """Iterate over all branches that, according to the db, are stacked."""
    # Avoiding circular import.
    from lp.code.model.branch import Branch
    store = getUtility(IStoreSelector).get(MAIN_STORE, SLAVE_FLAVOR)
    return store.find(Branch, Not(Branch.stacked_on == None))


def main():
    """Print all stacked branches from the database.

    See the module docstring for more information.
    """
    execute_zcml_for_scripts()
    for db_branch in get_stacked_branches():
        print '%s %s %s %s' % (
            db_branch.id, db_branch.branch_type.name, db_branch.unique_name,
            db_branch.stacked_on.unique_name)


if __name__ == '__main__':
    main()