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import os
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import subprocess
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import warnings
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from packaging.version import parse
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def digit_version(version_str: str, length: int = 4):
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"""Convert a version string into a tuple of integers.
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This method is usually used for comparing two versions. For pre-release
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versions: alpha < beta < rc.
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Args:
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version_str (str): The version string.
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length (int): The maximum number of version levels. Defaults to 4.
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Returns:
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tuple[int]: The version info in digits (integers).
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"""
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assert 'parrots' not in version_str
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version = parse(version_str)
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assert version.release, f'failed to parse version {version_str}'
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release = list(version.release)
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release = release[:length]
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if len(release) < length:
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release = release + [0] * (length - len(release))
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if version.is_prerelease:
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mapping = {'a': -3, 'b': -2, 'rc': -1}
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val = -4
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if version.pre:
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if version.pre[0] not in mapping:
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warnings.warn(f'unknown prerelease version {version.pre[0]}, '
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'version checking may go wrong')
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else:
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val = mapping[version.pre[0]]
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release.extend([val, version.pre[-1]])
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else:
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release.extend([val, 0])
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elif version.is_postrelease:
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release.extend([1, version.post])
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else:
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release.extend([0, 0])
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return tuple(release)
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def _minimal_ext_cmd(cmd):
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env = {}
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for k in ['SYSTEMROOT', 'PATH', 'HOME']:
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v = os.environ.get(k)
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if v is not None:
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env[k] = v
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env['LANGUAGE'] = 'C'
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env['LANG'] = 'C'
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env['LC_ALL'] = 'C'
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out, err = subprocess.Popen(
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cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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env=env).communicate()
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return out
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