How to send a change event to LSP server?

[Claude Zhao]

Hi guys,

I'm writing a LSP server and clinet in VS code. I use lsp4j to implement the LSP server and use the npm package vscode-languageclient to implement the client.

In the client, I use a FileSystemProvider to get the file conent, because I need a customize scheme. Below is code slice of the implementation of FileSystemProvider::readFile:



if (path) {
return fs.readFileSync(path);
}

As you see, I get the data from an existing file directly.
Then I use following code to open the uri:


vscode.commands.executeCommand('vscode.open', vscode.Uri.Parse(a-customize-uri));

Certainly the the file system provider could work and the file could
be opened, but no change event emitted when I modify the content. Which
means when I change the file content in the editor, no jsonRPC
communication between client and server.

I could get the change event when the file is saved (FileChangeType.Changed), but that's not what I want.

If I don't use FileSystemProvider, just open the file directly:


vscode.commands.executeCommand('vscode.open', vscode.Uri.file(abs-path))


Everything goes well, language client could send the change event correctly.

I also tried to add middle ware (didOpen, didSave, didChange) in the client options, but still could not work. Also, when I don't use the FileSystemProvider, the middle ware could be called correctly.

So I guess whether FileSystemProvider could interest the change event in the editor?

Not sure whether I describe my question clearly, but any comment would be appreciated.

Thanks!

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