add loop script

loop.ts

@@ -0,0 +1,32 @@
+#!/usr/bin/env -S deno run -A
+
+import { Channel } from "https://git.barnulf.net/mb/barnulf_ts/raw/branch/master/mod.ts";
+
+async function main() {
+    const channel = new Channel<"interrupt">();
+    Deno.addSignalListener("SIGINT", () => channel.send("interrupt"));
+    console.clear();
+    let process = run();
+    let last_interupt = 0;
+    while (true) {
+        const evt = await Promise.any([channel.receive(), process.output()]);
+        if (evt === "interrupt") {
+            process.kill();
+            await process.output();
+            const now = Date.now();
+            if (now - last_interupt < 1000) Deno.exit();
+            last_interupt = now;
+            console.clear();
+            console.log(" [Interrupt twice rapidly to close.]");
+        }
+        process = run();
+    }
+}
+
+function run() {
+    const [cmd, ...args] = ["cargo", "run", "--release"];
+    return new Deno.Command(cmd, { args, stdin: "inherit", stderr: "null" })
+        .spawn();
+}
+
+if (import.meta.main) await main();