How to support go to definition?

[ice1000]

Does that require some sort of C/C++ plugin to work?

How to implement stub indices for Zig?

[MarioAriasC]

Full support for Zig will require limiting some features to only CLion.

On CLion we can have access to C support

[ice1000]

Does this plugin implement stub indices?

[marknefedov]

Is it possible to implement them like in Rust plugin where debugging only supported in CLion?

[zekexiao]

Next version of IDEA will support LSP : Provide LSP API for external plugin developers

can directly use zls?

[MarioAriasC]

Still researching.

[HTGAzureX1212]

Still researching.

The LSP API is limited to commercial versions of the IDE. Therefore I refrained from using it in my plugin.