44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
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# This file is executed when the Pmw package is imported. It creates
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# a lazy importer/dynamic loader for Pmw and replaces the Pmw module
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# with it. Even though the loader from the most recent installed
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# version of Pmw is used, the user is able to specify which version of
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# Pmw megawidgets to load by using the setversion() function of the
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# loader.
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# This is the only file in Pmw which is not part of a particular Pmw
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# release.
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import sys
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import os
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import re
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def _hasLoader(dir):
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if dir.startswith('Pmw_2_') and sys.version_info < (3, 0):
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return 0
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# Only accept Pmw_V_R_P with single digits, since ordering will
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# not work correctly with multiple digits (for example, Pmw_10_0
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# will be before Pmw_9_9).
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if re.search('^Pmw_[0-9]_[0-9](_[0-9])?$', dir) is not None:
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for suffix in ('.py', '.pyc', '.pyo'):
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path = os.path.join(_dir, dir, 'lib', 'PmwLoader' + suffix)
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if os.path.isfile(path):
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return 1
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return 0
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# First get a list of all subdirectories containing versions of Pmw.
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_dir = __path__[0]
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_listdir = os.listdir(_dir)
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_instdirs = list(filter(_hasLoader, _listdir))
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_instdirs.sort()
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_instdirs.reverse()
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# Using the latest version import the dynamic loader.
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_loader = 'Pmw.' + _instdirs[0] + '.lib.PmwLoader'
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__import__(_loader)
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_mod = sys.modules[_loader]
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# Create the dynamic loader and install it into sys.modules.
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sys.modules['_Pmw'] = sys.modules['Pmw']
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sys.modules['Pmw'] = _mod.PmwLoader(_dir, _instdirs, _listdir)
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