sphinxarg/ext.py", line 448, in _open_filename return open(shutil.which(self.options['filename']))

[gmaggi]

Describe the bug

Hi, I am trying to build a doc (make html), but when I include sphinxarg.ext, that throws an error

How to Reproduce

make html
Running Sphinx v7.2.6
building [mo]: targets for 0 po files that are out of date
writing output... 
building [html]: targets for 4 source files that are out of date
updating environment: [new config] 4 added, 0 changed, 0 removed
reading sources... [100%] usage
Exception occurred:
  File "/opt/anaconda/anaconda3/envs/nerf_data_connector/lib/python3.10/site-packages/sphinxarg/ext.py", line 448, in _open_filename
    return open(shutil.which(self.options['filename']))
TypeError: expected str, bytes or os.PathLike object, not NoneType
The full traceback has been saved in /tmp/sphinx-err-bfir2eed.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
make: *** [Makefile:20: html] Error 2

Environment Information

ubuntu 20.04
python 3.10.13

python -c "import sphinxarg; print(sphinxarg.__version__)"
0.2.5

### Sphinx extensions

```python
extensions = [
    'sphinx.ext.autodoc',
    'sphinx.ext.viewcode',
    'sphinx.ext.napoleon',
    'sphinxarg.ext'
]

Additional context

No response

[SilverRainZ]

This error is thrown by the third-party extension sphinxarg.ext, not Sphinx itself.
It seems that sphinxarg.ext is provided by sphinx-argparse, please report the issue to it.

[picnixz]

Closing since it's not a native extension.