add JetBrains ecosystem plugin (WIP) reference

[Lordfirespeed]

This plugin is WIP, not-yet-released for various reasons:

1. LS Executables are not bundled into the plugin / downloaded at an appropriate time.
2. Currently requires JetBrains EAP builds (>=2023.2).
3. Not feature-complete.

To-do list:

• Plugin should bundle or download appropriate executables
• Plugin should automatically provide access to Roblox type definitions and docs (when appropriate)
• Plugin should integrate with Rojo (notably sourcemap.json)
• Errors/warning highlighting (Supported via LSP)
• Syntax highlighting
• Autocompletion provider (Supported via LSP)
• Go to reference provider (Supported via LSP)
• Refactor provider
• Folding builder
• Commenter
• Quick fixes (Supported via LSP)
• Wait for 2023.2 to be released in earnest
• Publish to JetBrains plugin marketplace

[JohnnyMorganz]

This is pretty neat, thank you!
Is the expectation that the Todo list is completed before this is available? Or is it usable in its current state

[Lordfirespeed]

It's not yet usable, no - a bit more of the to-do list needs to be done (especially the points relating to the binaries).
I didn't realise quite how difficult implementing this plugin would be 😂 even just refactoring support is difficult.

[JohnnyMorganz]

I don't think luau lsp has any refactoring operations. What kind of stuff does that entail?

[Lordfirespeed]

It involves some specific implementation (on my part) in the plugin. It's not trivial to explain, but

• see here for a simple properties language example
• see here for details

Essentially, whilst VSCode implements a 'naive' renaming system that looks for particular strings and replaces them, JetBrains language support plugins use a more complicated 'smart' renaming system that involves a language lexer and parser to generate tokens and use them to build a 'PSI tree' which can then be traversed to find usages of the text that will definitely be a reference, rather than just a coincidental instance of the text.