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# Copyright (C) 2009 Canonical Ltd
#
# 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, see <http://www.gnu.org/licenses/>.
"""Tracker of refs."""
class RefTracker(object):
def __init__(self):
# Head tracking: last ref, last id per ref & map of commit ids to ref*s*
self.last_ref = None
self.last_ids = {}
self.heads = {}
def dump_stats(self, note):
self._show_stats_for(self.last_ids, "last-ids", note=note)
self._show_stats_for(self.heads, "heads", note=note)
def clear(self):
self.last_ids.clear()
self.heads.clear()
def track_heads(self, cmd):
"""Track the repository heads given a CommitCommand.
:param cmd: the CommitCommand
:return: the list of parents in terms of commit-ids
"""
# Get the true set of parents
if cmd.from_ is not None:
parents = [cmd.from_]
else:
last_id = self.last_ids.get(cmd.ref)
if last_id is not None:
parents = [last_id]
else:
parents = []
parents.extend(cmd.merges)
# Track the heads
self.track_heads_for_ref(cmd.ref, cmd.id, parents)
return parents
def track_heads_for_ref(self, cmd_ref, cmd_id, parents=None):
if parents is not None:
for parent in parents:
if parent in self.heads:
del self.heads[parent]
self.heads.setdefault(cmd_id, set()).add(cmd_ref)
self.last_ids[cmd_ref] = cmd_id
self.last_ref = cmd_ref
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