How to add new map in `pixi.toml` ?

[huxs001]

I need to use conda cupy, and some pypi package requires cupy-cuda12x. So I need to map conda:cupy to pypi:cupy-cuda12x.
The full mapping might also consider conda:cuda-version=12.*.

Is this possible to set this mapping in pixi.toml ?

[ruben-arts]

@nichmor Do you have idea's on how to map these?

And is it possible to extend the mapping for conda-forge instead of fully overwriting it?

[huxs001]

1. a quick and dirty way is to manually set "cupy-cuda12x==13.6.0" or cupy-cuda12x==VER(conda-forge::cupy) is exists, and tell uv-pixi to treat "cupy-cuda12x==13.6.0" is exists and remove real "cupy-cuda12x" package.

[pip-provided]
cupy-cuda12x = "conda-forge::cupy" # Will be convert to the version of conda-forge::cupy, or disable this line if conda-forge::cupy is not added.
cupy-cuda12x = "==13.6.0" # Always treat cupy-cuda12x is satisfied thus uv-pixi will not install pypi cupy-cuda12x.
# There may be a warning if provided version is lower than requirement, but still make uv-pixi not to install cupy-cuda12x.

2. mapping can be write like this below. For list, all item are required, but only one item is used for getting version. If pypi request a higher version, the request should be relay to conda.

[pip-conda-mapping]
cupy-cuda12x = { getversion = "conda-forge::cupy", extra = "__cuda=12" } # set cupy-cuda12x eq cupy + __cuda, and use version from main item cupy
cupy-cuda12x = { getversion = "conda-forge::cupy", extra = "__cuda=12, conda-forge::pip" } # example for cupy-cuda12x eq cupy + pip + __cuda
cupy-cuda12x = ["conda-forge::cupy", "pip", "__cuda=12", "cuda=12", "cuda-toolkit=12.*"] # the first is always used to extract version.

Note: "__cuda=12" is just for example. I have no idea whether involve virtual packages is needed.

I design cupy-cuda12x = ["conda-forge::cupy", "pip", "__cuda=12", "cuda-toolkit=12.*"] as a requirement conversion. It means pypi requirement of "cupy-cuda12x>3" will be convert to "conda-forge::cupy>3" and pip of any version, and "__cuda=12", and "cuda-toolkit=12.*".

[ruben-arts]

@nichmor could we add these packages to the parselmouth mapping?

Next to that, I would like to add a way to extend the map manually. e.g.:

conda-pypi-map = { conda-forge.extend = { cupy = "cupy-cuda12x" } }

Adding it with versions would be best, but I'm not sure whether it would be worth the effort.