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kotlinlang

is it possible (yet?) with KSP2 (or the 2.0 kotlin compiler directly, for that matter) to invoke it directly?  i.e., in a unit/integration test say `invokeKsp("somesource.kt")` such that I can pass it various sources files to test against?

Yes this is one of the design goal of KSP2. The `symbol-processing-aa-embeddable` artifact is designed for this. Here are a couple of examples, though that they use `symbol-processing-aa` rather than `symbol-processing-aa-embeddable`.
1. <https://github.com/google/ksp/blob/main/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/cmdline/KSPJvmMain.kt|command line tool>
2. test <https://github.com/google/ksp/blob/main/test-utils/src/test/kotlin/com/google/devtools/ksp/test/AbstractKSPAATest.kt#L120|entry point>

We're working on the documentation and will publish it soon.

I just cobbled together a prototype based on that `KspJvmMain` that seems to do the trick.  i'll keep playing with it and refining it but I think that'll do it.  I think i can see how to limit it to just parsing a specific test file either by clever filtering or a brute force approach of different folders per test.  either way, making satisfactory progress.