[folding] Allow to fold all method bodies

[matklad]

When reading the code, it's very useful to fold function and method bodies: this gives you a quick outline of the file, with the ability to easily drill down specific function if you want to. It would be useful to have a "Fold all bodies" action to achieve that, similarly to how we already have "fold all block comments" and "fold all regions".

To give a specific example:

Unfolded:

Bodies folded:

Not that this can't be achieved "fold level 2", as not all bodies are at level 2, and not everything that is at level two is a function body.

API wise, it seems rather straightforward -- just add a "body" fold kind, and then let the language servers fill that out.

[vscodebot[bot]]

(Experimental duplicate detection) Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• [folding] Fold All in selection (#74360)
• [folding] show folding actions at the end of folding range as well (#60670)
• Feedback on folding UX for notebook (#117728)
• [folding] Fold current level (#75819)
• [folding] provide a toggle for non-selection aware fold level commands (#117991)

[matklad]

As an extension, it also would be useful to add a setting to fold bodies by default, a-la intellij:

[aeschli]

The folding infrastructure currently doesn't know where the method bodies are. We don't have an API for folding providers to communicate this (the same way as for comments and imports)

[matklad]

Just to clarify, the "API" for this would be adding one more value to already existing https://code.visualstudio.com/api/references/vscode-api#FoldingRangeKind.

[aeschli]

Correct.

[tlemo]

I'd love to see this finally happening, ideally the fully automatic variant: https://github.com/microsoft/vscode/issues/33449

[dubeg]

It's odd that Visual Studio doesn't have this feature either, I guess Microsoft devs just don't see the point in having that :/

[rrmistry]

This feature request made me think of this extension that does something similar but in a different language

https://marketplace.visualstudio.com/items?itemName=moalamri.inline-fold

Is it possible to do the same for Rust in an extension (maybe via a good Regex expression) , not relying on any new VS Code APIs?

[emilyyyylime]

wouldn't even be overly complicated thanks to Rust having a dedicated fn keyword; just needs to avoid false positives in comments/strings, and properly parse the return type (which could potentially contain semicolons and curly braces)

...okay it might be a bit complicated, and probably way harder for other languages. This definitely seems like a missing feature of the core LSP protocol. Some other easy fold kinds would be module and type/class