Following Comma development being discontinued, it was promised that the source code of Comma would be made available to the Raku community, to give anybody who wishes a shot at carrying it forward as an open source project. This repository contains that source.
There were a small number of custom patches to the IntelliJ platform source that have
been made available in another repository, intellij-ide-fork.
See the build doc in here
for information on how intellij-ide-fork is used relative to this repository.
Given the relatively complex build toolchain and cost of keeping up with new versions of the IDE platform, the most effective way forward for somebody interested in carrying this forward would be to maintain a plugin only. Probably it's also going to be easiest to do that by creating an entirely new plugin project, and bringing the code in piecemeal from this repository. A plugin-only approach has a far simpler build setup than is found here. See this tutorial for some pointers.
Note that this repository is basically a source dump that can serve as a seed for an open source Raku plugin for IntelliJ platform IDEs. We wish anybody attempting that the best of luck!