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"""
fs.wrapfs.hidefs
================
Removes resources from a directory listing if they match a given set of wildcards
"""
from fs.wrapfs import WrapFS
from fs.path import iteratepath
from fs.errors import ResourceNotFoundError
import re
import fnmatch
class HideFS(WrapFS):
"""FS wrapper that hides resources if they match a wildcard(s).
For example, to hide all pyc file and subversion directories from a filesystem::
hide_fs = HideFS(my_fs, "*.pyc", ".svn")
"""
def __init__(self, wrapped_fs, *hide_wildcards):
self._hide_wildcards = [re.compile(fnmatch.translate(wildcard)) for wildcard in hide_wildcards]
super(HideFS, self).__init__(wrapped_fs)
def _should_hide(self, path):
return any(any(wildcard.match(part) for wildcard in self._hide_wildcards)
for part in iteratepath(path))
def _encode(self, path):
if self._should_hide(path):
raise ResourceNotFoundError(path)
return path
def _decode(self, path):
return path
def exists(self, path):
if self._should_hide(path):
return False
return super(HideFS, self).exists(path)
def listdir(self, path="", *args, **kwargs):
entries = super(HideFS, self).listdir(path, *args, **kwargs)
entries = [entry for entry in entries if not self._should_hide(entry)]
return entries
if __name__ == "__main__":
from fs.osfs import OSFS
hfs = HideFS(OSFS('~/projects/pyfilesystem'), "*.pyc", ".svn")
hfs.tree()
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