Improve tui demo

demo/tui.ts

@@ -1,3 +1,6 @@
+/// <reference types="node" />
+import readline from 'node:readline';
+
 import { PrivateKey } from '@xo-cash/primitives';
 
 import type { BaseSyncClient } from '../source/shared/base-client.js';
@@ -20,6 +23,10 @@ const resetFormatting = () => {
     return '\x1b[0m';
 };
 
+// readline lets us get both whole lines and individual keypresses (for Escape)
+// escapeCodeTimeout: how long to wait after Escape to see if it's part of a key sequence (default 500ms)
+const rl = readline.createInterface({ input: process.stdin, output: process.stdout, escapeCodeTimeout: 0 });
+
 const startTUI = async (client: BaseSyncClient<string>) => {
     // Listen and log out the resource change
     client.on('resource-instance-updated', (message) => {
@@ -31,22 +38,55 @@ const startTUI = async (client: BaseSyncClient<string>) => {
 
     // Connect to the sync server and subscribe to the resource
     await client.connect();
-    await client.subscribe('encrypted-test');
+
+    const writeResourceLoop = async (resourceId: string) => {
+        while (true) {
+            // Print the prompt
+            process.stdout.write('> ');
+
+            // Wait for the user to enter a command
+            // Resolves with the typed line, or null if Escape was pressed
+            const onKeypress = (_char: string, key: readline.Key) => key?.name === 'escape' && rl.emit('line', null);
+            process.stdin.on('keypress', onKeypress);
+            const line = await new Promise<string | null>((resolve) => rl.once('line', resolve));
+            process.stdin.off('keypress', onKeypress);
+
+            // Escape exits the loop
+            if (line === null) return;
+
+            if (line.trim()) {
+                await client.write(resourceId, line.trim());
+            }
+        }
+    };
+
+    const selectResource = async () => {
+        while (true) {
+            console.log('Enter a resource:');
+
+            // Print the prompt
+            process.stdout.write('> ');
+
+            // Wait for the user to enter a command
+            const line = await new Promise<string>((resolve) => rl.once('line', resolve));
+            const resourceId = line.trim();
+
+            if (resourceId) {
+                // Subscribe to the resource
+                await client.subscribe(resourceId);
+
+                // Read the current instances
+                const instance = await client.read(resourceId);
+                console.dir(instance, { depth: null });
+
+                // Write to the resource
+                await writeResourceLoop(resourceId);
+            }
+        }
+    };
 
     // Start the TUI loop
-    while (true) {
+    await selectResource();
-        // Print the prompt
-        process.stdout.write('> ');
-
-        // Wait for the user to enter a command
-        const data = await new Promise((resolve) => process.stdin.once('data', resolve));
-
-        // If the user entered a command, write it to the resource
-        if (data) {
-            const message = data.toString().trim();
-            await client.write('encrypted-test', message);
-        }
-    }
 };
 
 const clients = {