refactor bridge plugin, minor improvement to plugin tracking.

plugin/src/plugin-registry.js

@@ -0,0 +1,37 @@
+// Maintains a set of known ignis plugin IDs for filtering.
+// Populated on bridge plugin load and updated when plugins are enabled/disabled.
+
+const knownIds = new Set(["ignis-bridge"]);
+
+async function refresh() {
+  try {
+    const res = await fetch("/api/plugins");
+    const plugins = await res.json();
+
+    // Keep ignis-bridge, add all bundled plugin IDs.
+    knownIds.clear();
+    knownIds.add("ignis-bridge");
+
+    for (const plugin of plugins) {
+      if (plugin.bundledPluginId) {
+        knownIds.add(plugin.bundledPluginId);
+      }
+    }
+  } catch {
+    // Keep whatever we had.
+  }
+}
+
+function isIgnisPlugin(pluginId) {
+  return knownIds.has(pluginId);
+}
+
+function addId(pluginId) {
+  knownIds.add(pluginId);
+}
+
+function getKnownIds() {
+  return knownIds;
+}
+
+module.exports = { refresh, isIgnisPlugin, addId, getKnownIds };