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# vim:set ts=4 sw=4 et ai syntax=python:
#
# Copyright (c) 2005 os-cillation
# Copyright (c) 1998-2002 James Henstridge
#
# Written by Benedikt Meurer <benny@xfce.org>.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
#
import fnmatch
import glob
import os
import sys
__all__ = ['require']
_pyexo_dir_pattern = 'exo-[0-9].[0-9]'
_pyexo_required_version = None
def _get_available_versions():
versions = {}
for dir in sys.path:
if not dir:
dir = os.getcwd()
if not os.path.isdir(dir):
continue
# if the dir is a pyexo dir, skip it
if fnmatch.fnmatchcase(os.path.basename(dir), _pyexo_dir_pattern):
continue
for filename in glob.glob(os.path.join(dir, _pyexo_dir_pattern)):
pathname = os.path.join(dir, filename)
# skip non directories
if not os.path.isdir(pathname):
continue
# skip empty directories
if not os.listdir(pathname):
continue
if not versions.has_key(filename[-3:]):
versions[filename[-3:]] = pathname
return versions
def require(version):
global _pyexo_required_version
if _pyexo_required_version != None:
assert _pyexo_required_version == version, \
"a different version of exo was already required"
return
assert not sys.modules.has_key('exo'), \
"pyexo.require() must be called before importing exo"
versions = _get_available_versions()
assert versions.has_key(version), \
"required version '%s' not found on system" % version
# remove any pyexo dirs first ...
for dir in sys.path:
if fnmatch.fnmatchcase(os.path.basename(dir), _pyexo_dir_pattern):
sys.path.remove(dir)
# prepend the pyexo path ...
sys.path.insert(0, versions[version])
_pyexo_required_version = version
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