I hadn't seen this before, so first off thanks for the pointer. I just spent 15 minutes poking through the instance you mentioned and looking at the project roa

I hadn't seen this before, so first off thanks for the pointer. I just spent 15 minutes poking through the instance you mentioned and looking at the project roadmap. That wasn't long enough to really get a feel for how easy it would be to extend to other languages. Based on that (brief) exposure, I'd say this lines up nicely with what Sourcegraph does for other languages. The big difference seems to be srclib, which is the underlying library that allows them to support other languages. I will also mention that the UX for Sourcegraph is more Github-inspired (I could use a word like 'modern', but that might not tell you as much) whereas DXR is a little clunkier.