init

.opencode/skills/markdown-novel-viewer/scripts/lib/port-finder.cjs

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+/**
+ * Port finder utility - finds available port in range
+ * Used by markdown-novel-viewer server
+ */
+
+const net = require('net');
+
+const DEFAULT_PORT = 3456;
+const PORT_RANGE_END = 3500;
+
+/**
+ * Check if a port is available
+ * @param {number} port - Port to check
+ * @returns {Promise<boolean>} - True if available
+ */
+function isPortAvailable(port) {
+  return new Promise((resolve) => {
+    const server = net.createServer();
+    server.once('error', () => resolve(false));
+    server.once('listening', () => {
+      server.close();
+      resolve(true);
+    });
+    server.listen(port);
+  });
+}
+
+/**
+ * Find first available port in range
+ * @param {number} startPort - Starting port (default: 3456)
+ * @returns {Promise<number>} - Available port
+ * @throws {Error} - If no port available in range
+ */
+async function findAvailablePort(startPort = DEFAULT_PORT) {
+  for (let port = startPort; port <= PORT_RANGE_END; port++) {
+    if (await isPortAvailable(port)) {
+      return port;
+    }
+  }
+  throw new Error(`No available port in range ${startPort}-${PORT_RANGE_END}`);
+}
+
+module.exports = {
+  isPortAvailable,
+  findAvailablePort,
+  DEFAULT_PORT,
+  PORT_RANGE_END
+};