# This file is executed when the Pmw package is imported. It creates
# a lazy importer/dynamic loader for Pmw and replaces the Pmw module
# with it. Even though the loader from the most recent installed
# version of Pmw is used, the user is able to specify which version of
# Pmw megawidgets to load by using the setversion() function of the
# loader.
# This is the only file in Pmw which is not part of a particular Pmw
# release.
import sys
import os
import re
def _hasLoader(dir):
# Only accept Pmw_V_R_P with single digits, since ordering will
# not work correctly with multiple digits (for example, Pmw_10_0
# will be before Pmw_9_9).
if re.search('^Pmw_[0-9]_[0-9](_[0-9])?$', dir) is not None:
for suffix in ('.py', '.pyc', '.pyo'):
path = os.path.join(_dir, dir, 'lib', 'PmwLoader' + suffix)
if os.path.isfile(path):
return 1
return 0
# First get a list of all subdirectories containing versions of Pmw.
_dir = __path__[0]
_listdir = os.listdir(_dir)
_instdirs = filter(_hasLoader, _listdir)
_instdirs.sort()
_instdirs.reverse()
# Using the latest version import the dynamic loader.
_loader = 'Pmw.' + _instdirs[0] + '.lib.PmwLoader'
__import__(_loader)
_mod = sys.modules[_loader]
# Create the dynamic loader and install it into sys.modules.
sys.modules['_Pmw'] = sys.modules['Pmw']
sys.modules['Pmw'] = _mod.PmwLoader(_dir, _instdirs, _listdir)
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