1 import * as lc from "vscode-languageclient/node";
2 import * as vscode from "vscode";
3 import { strict as nativeAssert } from "assert";
4 import { spawnSync } from "child_process";
5 import { inspect } from "util";
7 export function assert(condition: boolean, explanation: string): asserts condition {
9 nativeAssert(condition, explanation);
11 log.error(`Assertion failed:`, explanation);
16 export const log = new class {
17 private enabled = true;
18 private readonly output = vscode.window.createOutputChannel("Rust Analyzer Client");
20 setEnabled(yes: boolean): void {
24 // Hint: the type [T, ...T[]] means a non-empty array
25 debug(...msg: [unknown, ...unknown[]]): void {
26 if (!log.enabled) return;
27 log.write("DEBUG", ...msg);
30 info(...msg: [unknown, ...unknown[]]): void {
31 log.write("INFO", ...msg);
34 warn(...msg: [unknown, ...unknown[]]): void {
36 log.write("WARN", ...msg);
39 error(...msg: [unknown, ...unknown[]]): void {
41 log.write("ERROR", ...msg);
42 log.output.show(true);
45 private write(label: string, ...messageParts: unknown[]): void {
46 const message = messageParts.map(log.stringify).join(" ");
47 const dateTime = new Date().toLocaleString();
48 log.output.appendLine(`${label} [${dateTime}]: ${message}`);
51 private stringify(val: unknown): string {
52 if (typeof val === "string") return val;
55 depth: 6, // heuristic
60 export async function sendRequestWithRetry<TParam, TRet>(
61 client: lc.LanguageClient,
62 reqType: lc.RequestType<TParam, TRet, unknown>,
64 token?: vscode.CancellationToken,
66 // The sequence is `10 * (2 ** (2 * n))` where n is 1, 2, 3...
67 for (const delay of [40, 160, 640, 2560, 10240, null]) {
70 ? client.sendRequest(reqType, param, token)
71 : client.sendRequest(reqType, param)
75 log.warn("LSP request timed out", { method: reqType.method, param, error });
79 if (error.code === lc.ErrorCodes.RequestCancelled) {
83 if (error.code !== lc.ErrorCodes.ContentModified) {
84 log.warn("LSP request failed", { method: reqType.method, param, error });
93 export function sleep(ms: number) {
94 return new Promise(resolve => setTimeout(resolve, ms));
97 export type RustDocument = vscode.TextDocument & { languageId: "rust" };
98 export type RustEditor = vscode.TextEditor & { document: RustDocument };
100 export function isRustDocument(document: vscode.TextDocument): document is RustDocument {
101 // Prevent corrupted text (particularly via inlay hints) in diff views
102 // by allowing only `file` schemes
103 // unfortunately extensions that use diff views not always set this
104 // to something different than 'file' (see ongoing bug: #4608)
105 return document.languageId === 'rust' && document.uri.scheme === 'file';
108 export function isRustEditor(editor: vscode.TextEditor): editor is RustEditor {
109 return isRustDocument(editor.document);
112 export function isValidExecutable(path: string): boolean {
113 log.debug("Checking availability of a binary at", path);
115 const res = spawnSync(path, ["--version"], { encoding: 'utf8' });
117 const printOutput = res.error && (res.error as any).code !== 'ENOENT' ? log.warn : log.debug;
118 printOutput(path, "--version:", res);
120 return res.status === 0;
123 /** Sets ['when'](https://code.visualstudio.com/docs/getstarted/keybindings#_when-clause-contexts) clause contexts */
124 export function setContextValue(key: string, value: any): Thenable<void> {
125 return vscode.commands.executeCommand('setContext', key, value);
129 * Returns a higher-order function that caches the results of invoking the
130 * underlying function.
132 export function memoize<Ret, TThis, Param extends string>(func: (this: TThis, arg: Param) => Ret) {
133 const cache = new Map<string, Ret>();
135 return function(this: TThis, arg: Param) {
136 const cached = cache.get(arg);
137 if (cached) return cached;
139 const result = func.call(this, arg);
140 cache.set(arg, result);