Squash Odysseus development history

static/js/cookbookPorts.js

@@ -0,0 +1,19 @@
+// Pure port helpers extracted so they're unit-testable without the
+// browser-bound rest of cookbookRunning.js (issue #4507 follow-up).
+
+// Read the port out of a serve launch command. Handles --port 8000,
+// --port=8000, -p 8000, and -p=8000. Returns '' when none is present.
+export function portOf(cmd) {
+  const s = cmd || '';
+  const m = s.match(/--port[=\s]+(\d+)/) || s.match(/(?:^|\s)-p[=\s]+(\d+)/);
+  return m ? m[1] : '';
+}
+
+// Lowest free port >= start that isn't in usedPorts (array or Set of
+// numbers/strings). Returns a string to match the serve command format.
+export function nextFreePort(usedPorts, start = 8000) {
+  const used = new Set([...usedPorts].map(p => parseInt(p, 10)));
+  let port = start;
+  while (used.has(port)) port++;
+  return String(port);
+}