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https://github.com/dgelessus/python-rsrcfork.git
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7c77c4ef20
Reading the version number using attr: rsrcfork.__version__ will no longer work properly if rsrcfork has non-stdlib dependencies at import time, because setuptools needs to be able to import rsrcfork and read the version number before the dependencies are installed. As a workaround, our setup.py now manually parses the version number from rsrcfork/__init__.py using the ast module.
40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
#!/usr/bin/env python3
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import ast
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import setuptools
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def attr(file, name):
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"""Read the constant value of a global variable from a Python file without importing/executing it.
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The variable in question must be assigned a constant literal
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(as understood by :func:`ast.literal_eval`)
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in a simple assignment.
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The variable *should* only be assigned once
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(later assignments are silently ignored).
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Based on https://github.com/pypa/setuptools/issues/1960#issue-547330414.
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"""
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with open(file, "rb") as f:
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module = ast.parse(f.read())
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for node in ast.iter_child_nodes(module):
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if (
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isinstance(node, ast.Assign)
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and len(node.targets) == 1
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and isinstance(node.targets[0], ast.Name)
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and node.targets[0].id == name
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):
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return ast.literal_eval(node.value)
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else:
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raise ValueError(f"No simple assignment of variable {name!r} found in {file!r}")
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setuptools.setup(
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# Read the version number from the module source code without importing or executing it.
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# This is necessary because at the time that setup.py is executed,
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# the dependencies necessary to import rsrcfork may not be installed yet.
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version=attr("rsrcfork/__init__.py", "__version__"),
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)
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