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import * as lc from 'vscode-languageclient';
import * as vscode from 'vscode';
import { CallHierarchyFeature } from 'vscode-languageclient/lib/callHierarchy.proposed';
import { SemanticTokensFeature, DocumentSemanticsTokensSignature } from 'vscode-languageclient/lib/semanticTokens.proposed';
export function createClient(serverPath: string, cwd: string): lc.LanguageClient {
// '.' Is the fallback if no folder is open
// TODO?: Workspace folders support Uri's (eg: file://test.txt).
// It might be a good idea to test if the uri points to a file.
const run: lc.Executable = {
command: serverPath,
options: { cwd },
};
const serverOptions: lc.ServerOptions = {
run,
debug: run,
};
const traceOutputChannel = vscode.window.createOutputChannel(
'Rust Analyzer Language Server Trace',
);
const clientOptions: lc.LanguageClientOptions = {
documentSelector: [{ scheme: 'file', language: 'rust' }],
initializationOptions: vscode.workspace.getConfiguration("rust-analyzer"),
traceOutputChannel,
middleware: {
// Workaround for https://github.com/microsoft/vscode-languageserver-node/issues/576
async provideDocumentSemanticTokens(document: vscode.TextDocument, token: vscode.CancellationToken, next: DocumentSemanticsTokensSignature) {
const res = await next(document, token);
if (res === undefined) throw new Error('busy');
return res;
}
} as any
};
const res = new lc.LanguageClient(
'rust-analyzer',
'Rust Analyzer Language Server',
serverOptions,
clientOptions,
);
// To turn on all proposed features use: res.registerProposedFeatures();
// Here we want to enable CallHierarchyFeature and SemanticTokensFeature
// since they are available on stable.
// Note that while these features are stable in vscode their LSP protocol
// implementations are still in the "proposed" category for 3.16.
res.registerFeature(new CallHierarchyFeature(res));
res.registerFeature(new SemanticTokensFeature(res));
return res;
}
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