Make .egg-info filename parsing spec compliant#4533
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## Summary PR #4533 introduced (almost) spec compliant parsing of `.egg-info` filenames, but added the overly strict requirement that the distribution version must be present. This causes various `uv pip` operations to fail in environments where there are `.egg-info` files without a version component, so loosen this check by making the version component optional and reading the version from the egg metadata when it is not present. As an example of the issue, running `uv pip list` on my system currently results in ``` error: Failed to read metadata from: `/usr/lib/python3.12/site-packages/PySide6.egg-info` Caused by: The `.egg-info` filename "PySide6.egg-info" is missing a version ``` whereas regular `pip list` succeeds: ``` $ pip list | rg -S pyside PySide6 6.7.2 ``` ## Test Plan This has been tested by altering the `.egg-info` filename tests as needed and ensuring the full test suite passes locally.
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Summary
It turns out that
.egg-infofiles and directories can both have up to four segments in the filename: https://setuptools.pypa.io/en/latest/deprecated/python_eggs.html#filename-embedded-metadata. This PR upgrades the parsing and now uses the same parsing for files and directories.Closes #4532.