While not at all a complete solution, GitHub's upcoming code search capabilities may be of some use until a self-hosted solution is built: https://github.blog/changelog/2022-11-09-introducing-an-all-new-code-search-and-code-browsing-experience/ - there is a way to search through all repos on a particular repository (repo:archlinux/svntogit-packages
) or organization (which may contain forked repositories - think searching through upstream forks with the default branch being set to the latest built commit on the Arch package).