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Code search is a great tool! It really helps with productivity! But sometimes it is very easy to go down the rabbit hole.

I wonder if they can open source code search itself.

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I don't know the state of it, but Kythe is open source: https://kythe.io/

But in reality you probably want something more like SourceGraph which packages everything up nicely so that you don't need to worry about it, or something more specialized.

Bringing up kythe from scratch is very daunting. First thing I did when I left google, of course, but still really hard.

What did you use for a UI?

That's one of the main problems. I started with the demo frontend that comes in the box and just hacked on that. I'm no UI developer by any stretch.

Try TreeTide

cs.opensource.google runs on Google's search infrastructure, so it's unlikely to be open sourced. https://github.com/google/zoekt is open source, but lacks cross-referencing, and has a more spartan UI.

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