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