# -*- coding: utf-8 -*-
#
# rollbackimporter.py - commander
#
# Copyright (C) 2010 - Jesse van den Kieboom
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
import sys
import utils
class RollbackImporter:
def __init__(self):
"Creates an instance and installs as the global importer"
self._new_modules = []
self._original_import = __builtins__['__import__']
def monitor(self):
__builtins__['__import__'] = self._import
def cancel(self):
__builtins__['__import__'] = self._original_import
def _import(self, name, globals={}, locals={}, fromlist=[], level=0):
maybe = not name in sys.modules
mod = self._original_import(name, globals, locals, fromlist, level)
if maybe and utils.is_commander_module(mod):
self._new_modules.append(name)
return mod
def insert_main(self, mod):
self._new_modules.insert(0, mod)
def uninstall(self):
self.cancel()
for modname in self._new_modules:
if modname in sys.modules:
del sys.modules[modname]
self._new_modules = []
# ex:ts=4:et