feat: VS Code extension, web playground, LSP server

vscode/src/extension.ts

@@ -0,0 +1,54 @@
+/* Bux Language Server Protocol client for VS Code
+ * Launches bux-lsp binary and connects via stdin/stdout.
+ */
+
+import * as path from 'path';
+import * as vscode from 'vscode';
+import {
+    LanguageClient,
+    LanguageClientOptions,
+    ServerOptions,
+    TransportKind
+} from 'vscode-languageclient/node';
+
+let client: LanguageClient;
+
+export function activate(context: vscode.ExtensionContext) {
+    const config = vscode.workspace.getConfiguration('bux.lsp');
+    const enabled = config.get<boolean>('enabled', true);
+    if (!enabled) {
+        vscode.window.showInformationMessage('Bux LSP is disabled in settings');
+        return;
+    }
+
+    const lspPath = config.get<string>('path', 'bux-lsp');
+
+    const serverOptions: ServerOptions = {
+        command: lspPath,
+        transport: TransportKind.stdio
+    };
+
+    const clientOptions: LanguageClientOptions = {
+        documentSelector: [{ scheme: 'file', language: 'bux' }],
+        synchronize: {
+            fileEvents: vscode.workspace.createFileSystemWatcher('**/*.bux')
+        }
+    };
+
+    client = new LanguageClient(
+        'bux-lsp',
+        'Bux Language Server',
+        serverOptions,
+        clientOptions
+    );
+
+    client.start();
+    vscode.window.showInformationMessage('Bux LSP started');
+}
+
+export function deactivate(): Thenable<void> | undefined {
+    if (!client) {
+        return undefined;
+    }
+    return client.stop();
+}