Support for using GH Copilot API

[meain]

Wondering how hard it would be to add support for APIs used by GH Copilot. This helps us make use of Copilot subscription with other Emacs llm frontends. chep/copilot-chat.el does make use of this if you need a reference. With the somewhat recent addition of 3.5 Sonnet, it seems like a solid option. Roo Code seems to have done something similar recently and got a good reception(from what I saw on Reddit).

[ahyatt]

Is #113 what you are looking for? This is fairly close to finished right now.

[meain]

GitHub models is different. It is a separate model inference API provided by GH and is not related to the Copilot subscription. Also, it does not provide access to Sonnet and has shorter context window limits for most models AFAICT.

[ahyatt]

Thanks for the clarification. I looked around, and it doesn't look like there are docs for the API available. That doesn't mean it's not possible, but I'd have to separately reverse-engineer it, which will take some time. Because the llm package is FSF licensed, I can't just go off someone else's code.

That probably isn't something I'm going to have time for, but if there's anyone that does have FSF paperwork done, and does want to take this on, I think it'd be a reasonable thing to add. However, the lack of an API docs may mean that Github intends to make breaking changes, which is a risk factor here.

[markokocic]

Because the llm package is FSF licensed, I can't just go off someone else's code.

The chep/copilot-chat package mentioned above is MIT licensed, and MIT license is considered as an FSF compatible, meaning it can be used, bundled and distributed together with GPL code.

You are right, it may be that their API will change, but I doubt that the pace of change should be big, since there are already a lot of plugins that would break in that case.

Having support for GH Copilot would be really nice, since GH is, to my knowledge, the only AI tool that can be used free of cost for the maintainers of Open-Source projects.

[ahyatt]

Thanks for the clarification. I'll look into this; a lot will depend on how easy it is for me to test this. I have a Github Copilot account, but whether that lets me use this functionality I don't know.