python: Expose vendored vega version string

[dangotbanned]

Originally posted by @dangotbanned in review

@mattijn I've settled on the solution here for now:

• feat: Adds vl_convert_to_vega_version, remove vegalite_to_vega_ver…

I'm going to open an issue on https://github.com/vega/vl-convert to see if we can later replace this with a public vl_convert function/attribute.
The result would be the same and depend on the same const, but would be less reliant on the structure of vl-convert-vendor/src/main.rs

@jonmmease I was wondering if you'd be able to expose the version string component ("v5.30.0") of this under the top level vl_convert.___?

vl-convert/vl-convert-vendor/src/main.rs

Line 58 in 65bb836

const VEGA_PATH: &str = "/pin/vega@v5.30.0-fYDVG3pUN16BiGmbVNdw/mode=imports,min/optimized/vega.js";

The specific use-case here is to ensure we generate the correct alt.expr.___ methods, corresponding to a given vega release.
My first attempt used the dependencies in vega-lite, but this doesn't specify v5.3.0
https://github.com/vega/vega-lite/blob/c7697dc293b606ba60c7e374dbf9a77226f91225/package.json#L137-L138

Related

• feat: Generate expr method signatures, docs altair#3600 (comment)

[jonmmease]

Hi @dangotbanned, yeah exposing the vendored version numbers makes a lot of sense.