Would be nice to have a gnubg posting script for those of us who don’t have XG.
cheers!
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Yay; welcome to the forums!
Thanks for taking the time to post this request here. I had considered this originally but wasn’t sure how much interest there would be.
I have looked at the documentation on the GNUbg ID format and it shouldn’t be too difficult to code up. u/pgereddit on Reddit posted a few links (one of which I wasn’t aware of) that make diagrams from GNUbg IDs (https://apbg.net/bg_diagrams.php) but also convert GNUbg IDs to XGIDs (https://lassehjorthmadsen.github.io/backgammon/reference/gnuid2xgid.html). The latter is an approach I hadn’t considered that could be a nice approach for the purposes of this site as I can reuse the XGID formatting code (and keep the stylistic controls in a single place).
I will try to get this functionality either this weekend or in the next couple of weeks over the holidays at the latest. 
If you need help, I recently wrote some python code to generate GNUbg ID’s from an internal backgammon state.
Thanks for the offer to help; I should be able to get it though.
I plan to try the approach of converting the GNUbg ID to an XGID and then call the existing script over the next few days. The result should be a <div data-theme-gnuid> that users can use in place of the XGID <div data-theme-xgid> depending on their ID format of choice.
If I get stuck, I will send you a note 
Ok! This is now implemented
Check out this post GNUbg Users Rejoice! for the announcement.
I plan to next implement the inverse (XGID to GNUbg ID) and print the result under the XGID (small text) on every position for easy copy/paste into GNU for modifying positions.
Let me know what you think and/or have any issues!.