Add first version

README.md

-# dsp-indicator
+DSP Indicator - Gnome Shell extension
 
-DSP Indicator - Gnome extension
-
-Display Server Protocol Indicator (X11, Wayland,…)
\ No newline at end of file
+Display Server Protocol Indicator (X11, Wayland,…)

extension.js

+// vim: set sw=4 sts=4 et:
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+const Clutter = imports.gi.Clutter;
+const GObject = imports.gi.GObject;
+const Shell = imports.gi.Shell;
+const St = imports.gi.St;
+
+const Main = imports.ui.main;
+const PanelMenu = imports.ui.panelMenu;
+
+const ByteArray = imports.byteArray;
+const GLib = imports.gi.GLib;
+
+function getDSP() {
+    let dsp = null;    
+    let [ok, content, err, exit] = GLib.spawn_command_line_sync('/bin/bash -c "loginctl show-session $(awk \'/tty/ {print $1}\' <(loginctl)) -p Type | awk -F= \'{print $2}\'"');
+
+    if (content.length > 0) {
+        dsp = ByteArray.toString(content);
+    }
+
+    return dsp;
+}
+
+let DSPButton = GObject.registerClass(
+class DSPButton extends PanelMenu.Button {
+    _init() {
+        super._init(0.0, 'DSP Indicator');
+
+        let dsp = getDSP();
+        if (dsp == null) {
+            dsp = 'N/A';
+        }
+
+        let label = new St.Label({ text: dsp,
+                                   y_expand: true });
+                                   
+        this.add_actor(label);	
+    }
+});
+
+let DSPIndicatorButton;
+
+function enable() {
+    DSPIndicatorButton = new DSPButton();
+    Main.panel.addToStatusArea('dsp-indicator', DSPIndicatorButton);
+}
+
+function disable() {
+    DSPIndicatorButton.destroy();
+}

metadata.json

+{
+  "name": "DSP Indicator",
+  "description": "Display Server Protocol Indicator (X11, Wayland,…)",
+  "version": 1,
+  "uuid": "dspindicator@booloki.lokizone.net",
+  "shell-version": [ "3.36", "3.38", "40", "41" ],
+  "url": "https://git.lokizone.net/booloki/gnome-shell-extension-dsp-indicator"
+}

stylesheet.css

+/* Add your custom extension styling here */