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62 lines
1008 B
Python
62 lines
1008 B
Python
# Module 'maccache'
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#
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# Maintain a cache of listdir(), isdir(), isfile() or exists() outcomes.
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# XXX Should merge with module statcache
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import os
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# The cache.
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# Keys are absolute pathnames;
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# values are 0 (nothing), 1 (file) or [...] (dir).
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#
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cache = {}
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# Current working directory.
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#
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cwd = os.getcwd()
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# Constants.
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#
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NONE = 0
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FILE = 1
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LISTTYPE = type([])
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def _stat(name):
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name = os.path.join(cwd, name)
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if cache.has_key(name):
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return cache[name]
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if os.path.isfile(name):
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cache[name] = FILE
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return FILE
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try:
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list = os.listdir(name)
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except:
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cache[name] = NONE
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return NONE
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cache[name] = list
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if name[-1:] == ':': cache[name[:-1]] = list
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else: cache[name+':'] = list
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return list
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def isdir(name):
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st = _stat(name)
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return type(st) == LISTTYPE
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def isfile(name):
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st = _stat(name)
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return st == FILE
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def exists(name):
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st = _stat(name)
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return st <> NONE
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def listdir(name):
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st = _stat(name)
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if type(st) == LISTTYPE:
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return st
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else:
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raise RuntimeError, 'list non-directory'
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