First example

extension.js

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+/* extension.js
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/* exported init */
+
+const GETTEXT_DOMAIN = 'my-indicator-extension';
+
+const { GObject, St } = imports.gi;
+const GLib = imports.gi.GLib;
+const ByteArray = imports.byteArray;
+
+const ExtensionUtils = imports.misc.extensionUtils;
+const Main = imports.ui.main;
+const PanelMenu = imports.ui.panelMenu;
+const PopupMenu = imports.ui.popupMenu;
+
+const _ = ExtensionUtils.gettext;
+
+const Indicator = GObject.registerClass(
+    class Indicator extends PanelMenu.Button {
+        _init() {
+            super._init(0.0, _('My Shiny Indicator'));
+
+            this.add_child(new St.Icon({
+                icon_name: 'face-smile-symbolic',
+                style_class: 'system-status-icon',
+            }));
+
+            let sampleRate = getCurrentSampleRate();
+            let currentSampleRate = new PopupMenu.PopupMenuItem(_("Sample Rate: " + sampleRate));
+            this.menu.addMenuItem(currentSampleRate);
+
+            let allowedRates = getAllowedSampleRates();
+
+            for (let i = 0; i < allowedRates.length; i++) {
+                let allowedRate = new PopupMenu.PopupMenuItem(_("Allowed Rates: " + allowedRates[i]));
+                allowedRate.connect('activate', () => {
+                    console.log("set sample rate " + allowedRates[i]);
+                    setSampleRate(allowedRates[i]);
+                    currentSampleRate.label.text = "Sample Rate: " + getCurrentSampleRate();
+                });
+
+                this.menu.addMenuItem(allowedRate);
+            }
+        }
+    });
+
+class Extension {
+    constructor(uuid) {
+        this._uuid = uuid;
+
+        ExtensionUtils.initTranslations(GETTEXT_DOMAIN);
+    }
+
+    enable() {
+        this._indicator = new Indicator();
+        Main.panel.addToStatusArea(this._uuid, this._indicator);
+    }
+
+    disable() {
+        this._indicator.destroy();
+        this._indicator = null;
+    }
+}
+
+function init(meta) {
+    return new Extension(meta.uuid);
+}
+
+function setSampleRate(sampleRate) {
+    spawnCommandLine("pw-metadata -n settings 0 clock.rate " + sampleRate);
+}
+
+function getCurrentSampleRate() {
+    let res = spawnCommandLine("pw-metadata -n settings");
+    let lines = res.split(/\r?\n/);
+
+    for (let i = 0; i < lines.length; i++) {
+        if (lines[i].includes('clock.rate')) {
+            let phrases = lines[i].split(" ");
+
+            for (let j = 0; j < phrases.length; j++) {
+                if (phrases[j].includes("value")) {
+                    return phrases[j].slice(7, -1);
+                }
+            }
+        }
+    }
+
+    return "not found";
+}
+
+function getAllowedSampleRates() {
+    let res = spawnCommandLine("pw-metadata -n settings");
+    let lines = res.split(/\r?\n/);
+
+    for (let i = 0; i < lines.length; i++) {
+        if (lines[i].includes('clock.allowed-rates')) {
+            let valueIndex = lines[i].indexOf("value");
+
+            if (valueIndex !== -1) {
+                return lines[i].slice(valueIndex + 9, -11).replaceAll(",", "").split(" ");
+            }
+        }
+    }
+
+    return "not found";
+}
+
+// Runs @command_line in the background, handling any errors that
+// occur when trying to parse or start the program.
+function spawnCommandLine(command_line) {
+    try {
+        let [, stdout, stderr, status] = GLib.spawn_command_line_sync(command_line);
+
+        if (status !== 0) {
+            if (stderr instanceof Uint8Array)
+                stderr = ByteArray.toString(stderr);
+
+            throw new Error(stderr);
+        }
+
+        if (stdout instanceof Uint8Array)
+            stdout = ByteArray.toString(stdout);
+
+        // Now were done blocking the main loop, phewf!
+        return stdout;
+    } catch (e) {
+        throw new Error(e);
+    }
+}

metadata.json

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+{
+  "name": "Pipewire Settings",
+  "description": "Change pipewire settings for the current session",
+  "uuid": "pipewiresettings@gavania.de",
+  "shell-version": [
+    "43"
+  ]
+}

stylesheet.css

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+/* Add your custom extension styling here */