Support go to implementation for binary dependencies.

[everson]

A killer feature of Intellij is the ability for you see the implementation (by bytecode decoding, following included sources or even downloading sources).

Have you put any thought on implementing this?

[Ruin0x11]

I have, it's just that I need to implement the bit that marshals the .class file created by IntelliJ back to the client. For Emacs it should already be possible to view source files inside libraries, including following references and the like. To add this feature, there should be a case where if a binary file is detected the client can request the decompiled class as an LSP extension, then the actual file visited by the client will be pointed to a temporary file containing the decompiled source. Or the server could write the file instead and the client will assume the source file was placed in the location it expects.

One thing that should be possible now is updating the build system for your project to include sources for all libraries, then re-importing the project in IntelliJ so the sources are found for the binary libraries (there doesn't yet exist a command to do this client-side). Of course there could be libraries without any sources at all, so this is still an important feature to add.