examples: add modem watcher example in JS

examples/Makefile.am

@@ -1 +1 @@
-SUBDIRS = modem-watcher-python
+SUBDIRS = modem-watcher-python modem-watcher-javascript

examples/modem-watcher-javascript/Makefile.am

@@ -0,0 +1,5 @@
+
+EXTRA_DIST = \
+	main.js \
+	modemWatcher.js \
+	modem-watcher-javascript

examples/modem-watcher-javascript/README

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+
+The modem-watcher-javascript program makes use of the 'libmm-glib' library through
+GObject Introspection to talk to ModemManager.
+
+The program will just print in stdout whenever:
+ * ModemManager is found in the bus
+ * ModemManager is lost in the bus
+ * A new modem is added to ModemManager
+ * A modem is removed from ModemManager
+
+The output will look like this:
+
+$ ./modem-watcher-javascript
+[ModemWatcher] ModemManager service is available in bus
+[ModemWatcher] Vodafone (Huawei) (K3772) modem managed by ModemManager [861320000017897]: /org/freedesktop/ModemManager1/Modem/1
+[ModemWatcher] modem unmanaged by ModemManager: /org/freedesktop/ModemManager1/Modem/1
+[ModemWatcher] ModemManager service not available in bus
+
+Note that the program requires ModemManager and libmm-glib to be installed in
+the system and the introspection typelibs available in the standard paths.
+
+Have fun!

examples/modem-watcher-javascript/main.js

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+
+const Mainloop = imports.mainloop;
+const GLib     = imports.gi.GLib;
+
+const modemWatcher = imports.modemWatcher;
+
+function start() {
+    let watcher = new modemWatcher.ModemWatcher();
+
+    Mainloop.run();
+}

examples/modem-watcher-javascript/modem-watcher-javascript

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+#!/bin/sh
+
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU Lesser 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 Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc., 51
+# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright (C) 2014 Aleksander Morgado <aleksander@aleksander.es>
+#
+
+exec gjs-console -I . -c "const Main = imports.main; Main.start();"

examples/modem-watcher-javascript/modemWatcher.js

@@ -0,0 +1,89 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+//
+// This program is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser 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 Lesser General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Lesser General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc., 51
+// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// Copyright (C) 2014 Aleksander Morgado <aleksander@aleksander.es>
+//
+
+const Lang         = imports.lang;
+const Mainloop     = imports.mainloop;
+const Gio          = imports.gi.Gio;
+const ModemManager = imports.gi.ModemManager;
+
+// The ModemWatcher class
+const ModemWatcher = new Lang.Class({
+    Name: 'ModemWatcher',
+
+    _init: function() {
+        // The manager
+        this._manager = ModemManager.Manager.new_sync(Gio.DBus.system,
+                                                      Gio.DBusObjectManagerClientFlags.DO_NOT_AUTO_START,
+                                                      null)
+
+        // Follow changes in the ModemManager1 interface name owner
+        this._nameOwnerId = this._manager.connect('notify::name-owner', Lang.bind(this, this._ModemManagerNameOwnerChanged));
+        this._ModemManagerNameOwnerChanged()
+
+        // Follow added/removed objects
+        this._objectAddedId   = this._manager.connect('object-added',   Lang.bind(this, this._ModemAdded));
+        this._objectRemovedId = this._manager.connect('object-removed', Lang.bind(this, this._ModemRemoved));
+
+        // Add initial objects
+        let modem_object_list = this._manager.get_objects();
+        for (let i = 0; i < modem_object_list.length; i++)
+            this._ModemAdded(this._manager, modem_object_list[i]);
+    },
+
+    _ModemManagerNameOwnerChanged: function() {
+        if (this._manager.name_owner)
+            print('[ModemWatcher] ModemManager service is available in bus');
+        else
+            print('[ModemWatcher] ModemManager service not available in bus');
+    },
+
+    _ModemAdded: function(manager, object) {
+        let modem = object.get_modem();
+        print('[ModemWatcher] ' +
+              modem.get_manufacturer() +
+              ' (' +
+              modem.get_model() +
+              ') modem managed by ModemManager [' +
+              modem.get_equipment_identifier() +
+              ']: ' +
+              object.get_object_path());
+    },
+
+    _ModemRemoved: function(manager, object) {
+        print('[ModemWatcher] modem unmanaged by ModemManager: ' + object.get_object_path());
+    },
+
+    destroy: function() {
+        if (this._nameOwnerId) {
+            this._manager.disconnect(this._nameOwnerId);
+            this._nameOwnerId = 0;
+        }
+
+        if (this._objectAddedId) {
+            this._manager.disconnect(this._objectAddedId);
+            this._objectAddedId = 0;
+        }
+
+        if (this._objectRemovedId) {
+            this._manager.disconnect(this._objectRemovedId);
+            this._objectRemovedId = 0;
+        }
+    }
+});