Publish separate package for headless version, make opencv and pillow mandatory

[frafra]

Bug/Issue Description:
opencv is marked as optional, but dvr-scan does not work without it.
It happens on main c00ff6f.

Required Information:

$ dvr-scan --help
[...]
    from dvr_scan.__main__ import main
  File "/home/frafra/Code/DVR-Scan/dvr_scan/__init__.py", line 39, in <module>
    import dvr_scan.opencv_loader as _  # noqa: F401
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/frafra/Code/DVR-Scan/dvr_scan/opencv_loader.py", line 34, in <module>
    raise ModuleNotFoundError(
ModuleNotFoundError: OpenCV could not be found, try installing opencv-python:

pip install opencv-python

Expected Behavior:
opencv should be optional, right? :)

Computing Environment:

• OS: Linux
• Python Version: 3.12
• OpenCV Version: N/A

[frafra]

Pillow is not listed as dependency for opencv-python-headless, but it is needed.

[frafra]

This also happens when installing the package via pip without the optional opencv.

[Breakthrough]

Thanks for the report, I fixed this in 115e6b6 recently, which will be included in the next release (probably in a day or two). It shouldn't be needed for the headless version after v1.7 comes out.

opencv should be optional, right? :)

I agree, I should probably create a separate dvr-scan-headless package and make these dependencies non-optional. Thoughts?

[Breakthrough]

Assuming we want to make the dependencies mandatory, that implies we'll need separate packages for the headless vs. non-headless distributions. I am open to fixing this, but could use some input on the best way to resolve the issue.

Do you know if it's possible to create two separate packages from a single pyproject.toml file?

The correct way is probably to move the bulk of the code into something like dvr-scan-core, and have a "meta" dvr-scan and dvr-scan-headless package, where the latter two just provide the entry points.

[frafra]

I should probably create a separate dvr-scan-headless package and make these dependencies non-optional. Thoughts?

It is trickier to get a Python interpreted with tkinter than installing opencv, so it makes sense to have a headless version.

Do you know if it's possible to create two separate packages from a single pyproject.toml file?

I do not think it is possible, but I would need to check more carefully.