first working protocol version

align more closely with protocol

json rpc and some gaps

scripts/code-agent-host.js

@@ -0,0 +1,79 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// @ts-check
+
+const cp = require('child_process');
+const path = require('path');
+const minimist = require('minimist');
+
+async function main() {
+	const args = minimist(process.argv.slice(2), {
+		boolean: ['help', 'no-launch'],
+		string: ['port'],
+	});
+
+	if (args.help) {
+		console.log(
+			'Usage: ./scripts/code-agent-host.sh [options]\n' +
+				'\n' +
+				'Options:\n' +
+				'  --port <number>   Port to listen on (default: 8081, or VSCODE_AGENT_HOST_PORT env)\n' +
+				'  --no-launch       Start server without additional actions\n' +
+				'  --help            Show this help message',
+		);
+		return;
+	}
+
+	const port = args.port || process.env['VSCODE_AGENT_HOST_PORT'] || '8081';
+	const addr = await startServer(['--port', String(port)]);
+	console.log(`Agent Host server listening on ${addr}`);
+}
+
+function startServer(programArgs) {
+	return new Promise((resolve, reject) => {
+		const env = { ...process.env };
+		const entryPoint = path.join(
+			__dirname,
+			'..',
+			'out',
+			'vs',
+			'platform',
+			'agent',
+			'node',
+			'agentHostServerMain.js',
+		);
+
+		console.log(
+			`Starting agent host server: ${entryPoint} ${programArgs.join(' ')}`,
+		);
+		const proc = cp.spawn(process.execPath, [entryPoint, ...programArgs], {
+			env,
+			stdio: [process.stdin, null, process.stderr],
+		});
+		proc.stdout.on('data', (data) => {
+			const text = data.toString();
+			process.stdout.write(text);
+			const m = text.match(/READY:(\d+)/);
+			if (m) {
+				resolve(`ws://127.0.0.1:${m[1]}`);
+			}
+		});
+
+		proc.on('exit', (code) => process.exit(code));
+
+		process.on('exit', () => proc.kill());
+		process.on('SIGINT', () => {
+			proc.kill();
+			process.exit(128 + 2);
+		});
+		process.on('SIGTERM', () => {
+			proc.kill();
+			process.exit(128 + 15);
+		});
+	});
+}
+
+main();