SourceKit-LSP for other build systems

[DavidGoldman]

@blangmuir

Ah, that's a good point. Do you have a suggestion? Is textDocument/register too generic?

Hmm, probably. Sure we can think of something though

@blangmuir

For choosing files within those target that need to be (re)indexed, the index itself can tell which files are covered by existing index data and whether it is up-to-date.

How does it go about doing this (e.g. tell if it is up-to-date)?