Doc struct contains its uri, so we also need to change that (in doc.rkt).

The queries of the old document in queue also need to be handled (maybe just clear them) (in scheduler.rkt).

The new file is probably no longer a racket file, for example, someone create a racket file, but after a second, they realize it should be another language, then they rename it. So we need to check if the new file is a racket file.

The most difficult part is, we probably need to consider other files that depends on the old file.

@6cdh About dependency relation between files, I thought this is a big refactoring that should be another PR, and maybe a plan, what do you think?

I think so.

@6cdh all suggestions are applied.

Thank you!