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import { homedir } from 'os';
import * as lc from 'vscode-languageclient';
import { spawnSync } from 'child_process';
import { window, workspace } from 'vscode';
import { Config } from './config';
export function createClient(config: Config): 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.
let folder: string = '.';
if (workspace.workspaceFolders !== undefined) {
folder = workspace.workspaceFolders[0].uri.fsPath.toString();
}
const command = expandPathResolving(config.raLspServerPath);
if (spawnSync(command, ["--version"]).status !== 0) {
window.showErrorMessage(
`Unable to execute '${command} --version'
Perhaps it is not in $PATH?
PATH=${process.env.PATH}
`);
}
const run: lc.Executable = {
command,
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: config.lruCapacity,
maxInlayHintLength: config.maxInlayHintLength,
cargoWatchEnable: config.cargoWatchOptions.enable,
cargoWatchArgs: config.cargoWatchOptions.arguments,
cargoWatchCommand: config.cargoWatchOptions.command,
cargoWatchAllTargets:
config.cargoWatchOptions.allTargets,
excludeGlobs: config.excludeGlobs,
useClientWatching: config.useClientWatching,
featureFlags: config.featureFlags,
withSysroot: config.withSysroot,
cargoFeatures: config.cargoFeatures,
},
traceOutputChannel,
};
const res = 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
res._tracer = {
log: (messageOrDataObject: string | unknown, 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
res.logTrace(messageOrDataObject, data);
}
} else {
// @ts-ignore
res.logObjectTrace(messageOrDataObject);
}
},
};
res.registerProposedFeatures();
return res;
}
function expandPathResolving(path: string) {
if (path.startsWith('~/')) {
return path.replace('~', homedir());
}
return path;
}
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