mirror of
https://github.com/dgelessus/python-rsrcfork.git
synced 2024-11-25 19:31:44 +00:00
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
|
|
|
|
import ast
|
|
import setuptools
|
|
|
|
|
|
def attr(file, name):
|
|
"""Read the constant value of a global variable from a Python file without importing/executing it.
|
|
|
|
The variable in question must be assigned a constant literal
|
|
(as understood by :func:`ast.literal_eval`)
|
|
in a simple assignment.
|
|
The variable *should* only be assigned once
|
|
(later assignments are silently ignored).
|
|
|
|
Based on https://github.com/pypa/setuptools/issues/1960#issue-547330414.
|
|
"""
|
|
|
|
with open(file, "rb") as f:
|
|
module = ast.parse(f.read())
|
|
|
|
for node in ast.iter_child_nodes(module):
|
|
if (
|
|
isinstance(node, ast.Assign)
|
|
and len(node.targets) == 1
|
|
and isinstance(node.targets[0], ast.Name)
|
|
and node.targets[0].id == name
|
|
):
|
|
return ast.literal_eval(node.value)
|
|
else:
|
|
raise ValueError(f"No simple assignment of variable {name!r} found in {file!r}")
|
|
|
|
|
|
setuptools.setup(
|
|
# Read the version number from the module source code without importing or executing it.
|
|
# This is necessary because at the time that setup.py is executed,
|
|
# the dependencies necessary to import rsrcfork may not be installed yet.
|
|
version=attr("rsrcfork/__init__.py", "__version__"),
|
|
)
|