chore: attach when starting relay tmux session

src/cli/program.ts

@@ -253,11 +253,17 @@ With Tailscale:
 
 	program
 		.command("relay:tmux")
-		.description("Run relay --verbose inside tmux (session warelay-relay), restarting if already running")
+		.description(
+			"Run relay --verbose inside tmux (session warelay-relay), restarting if already running, then attach",
+		)
 		.action(async () => {
 			try {
-				const session = await spawnRelayTmux();
-				defaultRuntime.log(info(`tmux session started: ${session} (pane running "pnpm warelay relay --verbose")`));
+				const session = await spawnRelayTmux("pnpm warelay relay --verbose", true);
+				defaultRuntime.log(
+					info(
+						`tmux session started and attached: ${session} (pane running "pnpm warelay relay --verbose")`,
+					),
+				);
 			} catch (err) {
 				defaultRuntime.error(danger(`Failed to start relay tmux session: ${String(err)}`));
 				defaultRuntime.exit(1);

src/cli/relay_tmux.ts

@@ -2,7 +2,10 @@ import { spawn } from "node:child_process";
 
 const SESSION = "warelay-relay";
 
-export async function spawnRelayTmux(cmd = "pnpm warelay relay --verbose") {
+export async function spawnRelayTmux(
+	cmd = "pnpm warelay relay --verbose",
+	attach = true,
+) {
 	await killSession(SESSION);
 	await new Promise<void>((resolve, reject) => {
 		const child = spawn("tmux", ["new", "-d", "-s", SESSION, cmd], {
@@ -15,6 +18,21 @@ export async function spawnRelayTmux(cmd = "pnpm warelay relay --verbose") {
 			else reject(new Error(`tmux exited with code ${code}`));
 		});
 	});
+
+	if (attach) {
+		await new Promise<void>((resolve, reject) => {
+			const child = spawn("tmux", ["attach-session", "-t", SESSION], {
+				stdio: "inherit",
+				shell: false,
+			});
+			child.on("error", reject);
+			child.on("exit", (code) => {
+				if (code === 0) resolve();
+				else reject(new Error(`tmux attach exited with code ${code}`));
+			});
+		});
+	}
+
 	return SESSION;
 }