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import { homedir } from 'os';
import * as lc from 'vscode-languageclient';
import { window, workspace } from 'vscode';
import { Config } from './config';
import { Highlighter } from './highlighting';
function expandPathResolving(path: string) {
if (path.startsWith('~/')) {
return path.replace('~', homedir());
}
return path;
}
export class Server {
public static highlighter = new Highlighter();
public static config = new Config();
public static client: lc.LanguageClient;
public static start(
notificationHandlers: Iterable<[string, lc.GenericNotificationHandler]>
) {
// '.' 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.
let folder: string = '.';
if (workspace.workspaceFolders !== undefined) {
folder = workspace.workspaceFolders[0].uri.fsPath.toString();
}
const run: lc.Executable = {
command: expandPathResolving(this.config.raLspServerPath),
options: { cwd: folder }
};
const serverOptions: lc.ServerOptions = {
run,
debug: run
};
const traceOutputChannel = window.createOutputChannel(
'Rust Analyzer Language Server Trace'
);
const clientOptions: lc.LanguageClientOptions = {
documentSelector: [{ scheme: 'file', language: 'rust' }],
initializationOptions: {
publishDecorations: true,
lruCapacity: Server.config.lruCapacity,
excludeGlobs: Server.config.excludeGlobs,
useClientWatching: Server.config.useClientWatching,
featureFlags: Server.config.featureFlags
},
traceOutputChannel
};
Server.client = new lc.LanguageClient(
'rust-analyzer',
'Rust Analyzer Language Server',
serverOptions,
clientOptions
);
// HACK: This is an awful way of filtering out the decorations notifications
// However, pending proper support, this is the most effecitve approach
// Proper support for this would entail a change to vscode-languageclient to allow not notifying on certain messages
// Or the ability to disable the serverside component of highlighting (but this means that to do tracing we need to disable hihlighting)
// This also requires considering our settings strategy, which is work which needs doing
// @ts-ignore The tracer is private to vscode-languageclient, but we need access to it to not log publishDecorations requests
Server.client._tracer = {
log: (messageOrDataObject: string | any, data?: string) => {
if (typeof messageOrDataObject === 'string') {
if (
messageOrDataObject.includes(
'rust-analyzer/publishDecorations'
) ||
messageOrDataObject.includes(
'rust-analyzer/decorationsRequest'
)
) {
// Don't log publish decorations requests
} else {
// @ts-ignore This is just a utility function
Server.client.logTrace(messageOrDataObject, data);
}
} else {
// @ts-ignore
Server.client.logObjectTrace(messageOrDataObject);
}
}
};
Server.client.registerProposedFeatures();
Server.client.onReady().then(() => {
for (const [type, handler] of notificationHandlers) {
Server.client.onNotification(type, handler);
}
});
Server.client.start();
}
}
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