Make the (very minimal) CLI official

bin/cli.js

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+
+// Quick informal command-line interface for rdapper
+// Usage:
+//   npx rdapper example.com
+//   echo "example.com" | npx rdapper
+
+import { createInterface } from "node:readline";
+import { lookupDomain } from "../dist/index.js";
+
+async function main() {
+  if (process.argv.length > 2) {
+    // URL(s) specified in the command arguments
+    console.log(
+      JSON.stringify(
+        await lookupDomain(process.argv[process.argv.length - 1]),
+        null,
+        2,
+      ),
+    );
+  } else {
+    // No domain passed as argument, read from each line of stdin
+    const rlInterface = createInterface({
+      input: process.stdin,
+    });
+    rlInterface.on("line", async (line) => {
+      console.log(JSON.stringify(await lookupDomain(line), null, 2));
+    });
+  }
+}
+
+main();