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>>> import pathlib
>>> du = PackageIndex._resolve_download_filename
>>> root = getfixture('tmp_path')
>>> url = 'https://files.pythonhosted.org/packages/a9/5a/0db.../setuptools-78.1.0.tar.gz'
>>> str(pathlib.Path(du(url, root)).relative_to(root))
'setuptools-78.1.0.tar.gz'
Ensures the target is always in tmpdir.
>>> url = 'https://anyhost/%2fhome%2fuser%2f.ssh%2fauthorized_keys'
>>> du(url, root)
Traceback (most recent call last):
...
ValueError: Invalid filename...
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>>> rvcs = PackageIndex._resolve_vcs
>>> rvcs('git+http://foo/bar')
'git'
>>> rvcs('hg+https://foo/bar')
'hg'
>>> rvcs('git:myhost')
'git'
>>> rvcs('hg:myhost')
>>> rvcs('http://foo/bar')
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>>> vsrfu('git+https://github.com/pypa/setuptools@v69.0.0#egg-info=setuptools')
('https://github.com/pypa/setuptools', 'v69.0.0')
>>> vsrfu('git+https://github.com/pypa/setuptools#egg-info=setuptools')
('https://github.com/pypa/setuptools', None)
>>> vsrfu('http://foo/bar')
('http://foo/bar', None)
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