1 files changed, 49 insertions, 0 deletions

diff --git a/src/mailman/utilities/mailbox.py b/src/mailman/utilities/mailbox.py
new file mode 100644
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+++ b/src/mailman/utilities/mailbox.py
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+# Copyright (C) 2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman 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 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman 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
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Module stuff."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'Mailbox',
+    ]
+
+
+# Use a single file format for the digest mailbox because this makes it easier
+# to calculate the current size of the mailbox.  This way, we don't have to
+# carry around or store the size of the mailbox, we can just stat the file to
+# get its size.  MMDF is slightly more sane than mbox; it's primary advantage
+# for us is that it does no 'From' mangling.
+# mangling.
+from mailbox import MMDF
+
+
+
+class Mailbox(MMDF):
+    """A mailbox that interoperates with the 'with' statement."""
+
+    def __enter__(self):
+        self.lock()
+        return self
+
+    def __exit__(self, *exc):
+        self.flush()
+        self.unlock()
+        # Don't suppress the exception.
+        return False