Support virtual workspaces

[lszomoru]

👋 Hi there, Martin here, from the VS Code team.

Recently we've announced the Remote Repository feature that lets you browse and edit files and folders directly on GitHub.

Open Remote Repository... opens VSCode on a folder or workspace located on a virtual file system. We call this a virtual workspace. We observed that not all extension support this well, either because they can not, or they haven't thought about it.

It would be fantastic if you could test whether your extension can handle virtual workspaces:

Check out the Virtual Workspaces Extension Author Guide on how to do that.

When done, set the new virtualWorkspaces capability in your 'package.json'.

{
  "capabilities": {
    "virtualWorkspaces": true | false
  }
}

• Use "virtualWorkspaces": true if your extension is prepared for virtual workspaces
• Use "virtualWorkspaces": false if your extension should be disabled when a virtual workspace is opened

For questions and comments please use the Virtual Workspaces Tracking Issue.

Thanks for the support and the great work! ❤️

[rgrunber]

Doing a quick test on VSCode Insiders (with "capabilities": { "virtualWorkspaces": true }, it seems we'll need to support the vscode-vfs scheme for URIs on https://github.com/eclipse/eclipse.jdt.ls/, in addition to making sure we use proper URI API (and no file based assumptions).

[testforstephen]

The backend JDT has its own file system API EFS, and the usual implementation is based on disk files. We need to evaluate how to make it support virtual file system, such as accessing resources directly from a remote location.

Before we figure this out, we can just declare "virtualWorkspaces": false to disable virtual workspace support.

[rgrunber]

Some additional info :

• https://wiki.eclipse.org/EFS#Overview
• https://github.com/eclipse/eclipse.jdt.ls/issues/905

It may not be as bad as we think assuming we just need to provide an implementation.

[aeschli]

IMO it would great to get single-file functionality thinks like outline, folding and document symbols.