feat: implement downloader (#2)

package.json

@@ -60,6 +60,11 @@
 				"command": "biome.restartLspServer",
 				"title": "Restart LSP Server",
 				"category": "Biome"
+			},
+			{
+				"command": "biome.clearVersionsCache",
+				"title": "Clear versions cache",
+				"category": "Biome"
 			}
 		],
 		"menus": {
@@ -149,13 +154,16 @@
 		"@biomejs/biome": "^1.2.2",
 		"@types/node": "^18.17.5",
 		"@types/resolve": "^1.20.2",
+		"@types/semver": "^7.5.4",
 		"@types/vscode": "^1.80.0",
 		"@vscode/vsce": "^2.20.1",
 		"esbuild": "^0.19.2",
 		"typescript": "^5.1.6"
 	},
 	"dependencies": {
 		"resolve": "^1.22.4",
+		"semver": "^7.5.4",
+		"undici": "^5.27.2",
 		"vscode-languageclient": "^8.1.0"
 	},
 	"vsce": {

src/commands/index.ts

@@ -1,6 +1,9 @@
 // list of commands available in the VS Code extension
 export enum Commands {
+	StopServer = "biome.stopServer",
 	RestartLspServer = "biome.restartLspServer",
 	SyntaxTree = "biome.syntaxTree",
 	ServerStatus = "biome.serverStatus",
+	UpdateBiome = "biome.updateBiome",
+	ChangeVersion = "biome.changeVersion",
 }

src/downloader.ts

@@ -0,0 +1,186 @@
+import { chmodSync } from "node:fs";
+import { coerce, rcompare } from "semver";
+import { fetch } from "undici";
+import {
+	ExtensionContext,
+	ProgressLocation,
+	Uri,
+	commands,
+	window,
+	workspace,
+} from "vscode";
+import { Commands } from "./commands";
+
+export const selectAndDownload = async (
+	context: ExtensionContext,
+): Promise<string | undefined> => {
+	const versions = await window.withProgress(
+		{
+			location: ProgressLocation.Notification,
+			title: "Fetching Biome versions",
+			cancellable: false,
+		},
+		async () => {
+			return await getVersions(context);
+		},
+	);
+
+	const version = await askVersion(versions);
+
+	if (!version) {
+		return undefined;
+	}
+
+	return await window.withProgress(
+		{
+			location: ProgressLocation.Notification,
+			title: `Downloading Biome ${version}`,
+			cancellable: false,
+		},
+		async () => {
+			await commands.executeCommand(Commands.StopServer);
+			await download(version, context);
+			await commands.executeCommand(Commands.RestartLspServer);
+			return version;
+		},
+	);
+};
+
+export const updateToLatest = async (context: ExtensionContext) => {
+	await window.withProgress(
+		{
+			location: ProgressLocation.Notification,
+			title: "Updating Biome version",
+			cancellable: false,
+		},
+		async () => {
+			const versions = await getVersions(context);
+			const version = versions[0];
+			await commands.executeCommand(Commands.StopServer);
+			await download(version, context);
+			await commands.executeCommand(Commands.RestartLspServer);
+		},
+	);
+};
+
+/**
+ * Download the Biome CLI from GitHub
+ *
+ * @param version The version to download
+ */
+const download = async (version: string, context: ExtensionContext) => {
+	const releases = (await (
+		await fetch(
+			`https://api.github.com/repos/biomejs/biome/releases/tags/cli/v${version}`,
+		)
+	).json()) as {
+		assets: { name: string; browser_download_url: string }[];
+	};
+
+	const platformArch = `${process.platform}-${process.arch}`;
+
+	// Find the asset for the current platform
+	const asset = releases.assets.find(
+		(asset) =>
+			asset.name ===
+			`biome-${platformArch}${process.platform === "win32" ? ".exe" : ""}`,
+	);
+
+	if (!asset) {
+		window.showErrorMessage(
+			`The specified version is not available for your platform/architecture (${platformArch}).`,
+		);
+		return;
+	}
+
+	let bin: ArrayBuffer;
+	try {
+		const blob = await fetch(asset.browser_download_url);
+		bin = await blob.arrayBuffer();
+	} catch {
+		window.showErrorMessage(
+			`Could not download the binary for your platform/architecture (${platformArch}).`,
+		);
+		return;
+	}
+
+	// Write binary file to disk
+	await workspace.fs.writeFile(
+		Uri.joinPath(
+			context.globalStorageUri,
+			"server",
+			`biome${process.platform === "win32" ? ".exe" : ""}`,
+		),
+		new Uint8Array(bin),
+	);
+
+	// Make biome executable
+	chmodSync(
+		Uri.joinPath(
+			context.globalStorageUri,
+			"server",
+			`biome${process.platform === "win32" ? ".exe" : ""}`,
+		).fsPath,
+		0o755,
+	);
+
+	// Record latest version
+	await context.globalState.update("bundled_biome_version", version);
+};
+
+/**
+ * Display the VS Code prompt for selection the version
+ */
+const askVersion = async (versions: string[]): Promise<string | undefined> => {
+	const options = versions.map((version, index) => ({
+		label: version,
+		description: index === 0 ? "(latest)" : "",
+	}));
+
+	const result = await window.showQuickPick(options, {
+		placeHolder: "Select the version of the biome CLI to install",
+	});
+
+	return result?.label;
+};
+
+/**
+ * Retrieves the list of versions of the CLI.
+ *
+ * The calls to the API are cached for 1 hour to prevent hitting the rate limit.
+ */
+export const getVersions = async (
+	context: ExtensionContext,
+): Promise<string[]> => {
+	const cachedVersions = context.globalState.get<{
+		expires_at: Date;
+		versions: string[];
+	}>("biome_versions_cache");
+
+	// If the cache exists and is still valid, return it
+	if (cachedVersions && new Date(cachedVersions.expires_at) > new Date()) {
+		return cachedVersions.versions;
+	}
+
+	const releases = (await (
+		await fetch(
+			"https://api.github.com/repos/biomejs/biome/releases?per_page=100",
+		)
+	).json()) as { tag_name: string }[];
+
+	const versions = releases
+		.filter((release) => release.tag_name.startsWith("cli/"))
+		.map((release) => release.tag_name.replace("cli/", ""))
+		.map((release) => coerce(release))
+		.sort((a, b) => rcompare(a, b))
+		.filter((release) => release?.version !== null)
+		.map((release) => release?.version);
+
+	// Cache the result for 1 hour
+	await context.globalState.update("biome_versions_cache", {
+		expires_at: new Date(Date.now() + 60 * 60 * 1000),
+		versions,
+	});
+
+	return versions;
+};