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import os
import pathlib
import zipfile
import tempfile
import functools
import contextlib
def from_package(package):
"""
Return a Traversable object for the given package.
"""
return fallback_resources(package.__spec__)
def fallback_resources(spec):
package_directory = pathlib.Path(spec.origin).parent
try:
archive_path = spec.loader.archive
rel_path = package_directory.relative_to(archive_path)
return zipfile.Path(archive_path, str(rel_path) + '/')
except Exception:
pass
return package_directory
@contextlib.contextmanager
def _tempfile(reader, suffix=''):
# Not using tempfile.NamedTemporaryFile as it leads to deeper 'try'
# blocks due to the need to close the temporary file to work on Windows
# properly.
fd, raw_path = tempfile.mkstemp(suffix=suffix)
try:
os.write(fd, reader())
os.close(fd)
yield pathlib.Path(raw_path)
finally:
try:
os.remove(raw_path)
except FileNotFoundError:
pass
@functools.singledispatch
@contextlib.contextmanager
def as_file(path):
"""
Given a Traversable object, return that object as a
path on the local file system in a context manager.
"""
with _tempfile(path.read_bytes, suffix=path.name) as local:
yield local
@as_file.register(pathlib.Path)
@contextlib.contextmanager
def _(path):
"""
Degenerate behavior for pathlib.Path objects.
"""
yield path