feat: add relay:tmux helper for relay watcher

src/cli/program.ts

@@ -11,6 +11,7 @@ import { pickProvider } from "../provider-web.js";
 import type { Provider } from "../utils.js";
 import { createDefaultDeps, logWebSelfId, logTwilioFrom, monitorTwilio } from "./deps.js";
 import { ensureTwilioEnv } from "../env.js";
+import { spawnRelayTmux } from "./relay_tmux.js";
 
 export function buildProgram() {
 	const program = new Command();
@@ -250,5 +251,18 @@ With Tailscale:
 			}
 		});
 
+	program
+		.command("relay:tmux")
+		.description("Run relay --verbose inside tmux (session warelay-relay), restarting if already running")
+		.action(async () => {
+			try {
+				const session = await spawnRelayTmux();
+				defaultRuntime.log(info(`tmux session started: ${session} (pane running "pnpm warelay relay --verbose")`));
+			} catch (err) {
+				defaultRuntime.error(danger(`Failed to start relay tmux session: ${String(err)}`));
+				defaultRuntime.exit(1);
+			}
+		});
+
 	return program;
 }

src/cli/relay_tmux.ts

@@ -0,0 +1,29 @@
+import { spawn } from "node:child_process";
+
+const SESSION = "warelay-relay";
+
+export async function spawnRelayTmux(cmd = "pnpm warelay relay --verbose") {
+	await killSession(SESSION);
+	await new Promise<void>((resolve, reject) => {
+		const child = spawn("tmux", ["new", "-d", "-s", SESSION, cmd], {
+			stdio: "inherit",
+			shell: false,
+		});
+		child.on("error", reject);
+		child.on("exit", (code) => {
+			if (code === 0) resolve();
+			else reject(new Error(`tmux exited with code ${code}`));
+		});
+	});
+	return SESSION;
+}
+
+async function killSession(name: string) {
+	await new Promise<void>((resolve) => {
+		const child = spawn("tmux", ["kill-session", "-t", name], {
+			stdio: "ignore",
+		});
+		child.on("exit", () => resolve());
+		child.on("error", () => resolve());
+	});
+}