"""Clear ``sys.modules`` of specific types of modules if one is stale."""
__docformat__ = "restructuredtext"
_lastModuleUpdate = time.time()
def clearModules():
"""Clear ``sys.modules`` of specific types of modules if one is stale.
See ``properties.CLEAR_MODULES``.
I took this method out of the ``InternalLibrary`` class so that you can
call it *really* early, even before you create a ``Context`` to pass to
``InternalLibrary``.
"""
global _lastModuleUpdate
if not properties.CLEAR_MODULES:
return
deleteTheseTypes = properties.CLEAR_MODULES
if not isinstance(deleteTheseTypes, list):
# Update Seamstress Exchange's properties file if you change this.
deleteTheseTypes = ["aquarium.layout","aquarium.navigation",
"aquarium.screen", "aquarium.widget"]
deleteThese = [
moduleName
for moduleType in deleteTheseTypes
for moduleName in sys.modules.keys()
if (moduleName == moduleType or
moduleName.startswith(moduleType + "."))
]
for i in deleteThese:
try:
file = sys.modules[i].__file__
except AttributeError:
continue
if file.endswith(".pyc") and os.path.exists(file[:-1]):
file = file[:-1]
ST_MTIME = 8
if (_lastModuleUpdate < os.stat(file)[ST_MTIME]):
staleModules = True
break
else:
staleModules = False
if staleModules:
for i in deleteThese: # You can't modify a dictionary
del sys.modules[i] # during an iteration.
_lastModuleUpdate = time.time()
