VSCode plugin: Add a setting for which subdirectories should be considered Cargo workspaces

[malte-v]

Not sure if this is already possible or has been asked before, but how do I handle a project like this?

<vscode workspace root>
- my_rust_project/
  - src/
  - Cargo.toml
- some_other_stuff/
  - ...
- Dockerfile

Currently, the plugin just complains about not finding a Cargo.toml in the workspace root. I know I could just use multiple VSCode workspaces, but I'm not a big fan of that because it would get quite messy in more complex project layouts.

I would suggest adding a rust-analyzer.cargoWorkspaces setting to the VSCode plugin that allows one to specify multiple subdirectories which should be considered Cargo workspaces.

[lnicola]

#3309 would pretty much fix this.

[malte-v]

You're right, sorry for the duplicate.

[TzviPM]

In case anyone else runs into this, one solution that works for more deeply nested rust crates is to add a Cargo.toml file in the root folder of the project with a workspace config that references the nested folders with rust crates.

[pravic]

Can we make #3309 configurable how deep to look?
Or can we add a configuration option to specify the path to the main Cargo.toml?

Because now it's either a totally manual rust-project.json or to open an additional VSCode instance with an inner folder.

[flodiebold]

Because now it's either a totally manual rust-project.json or to open an additional VSCode instance with an inner folder.

It's not; you just have to specify linkedProjects.

[pravic]

@flodiebold Do you mean that linkedProjects can point to Cargo.toml?

Exactly:

Elements must be paths pointing to Cargo.toml, rust-project.json, or JSON objects in rust-project.json format.

Thanks!