trayicon: check for dependency on dbus service

safeeyes/plugins/trayicon/dependency_checker.py

@@ -0,0 +1,58 @@
+# Safe Eyes is a utility to remind you to take break frequently
+# to protect your eyes from eye strain.
+
+# Copyright (C) 2017  Gobinath
+
+# 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 3 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/>.
+
+from safeeyes import utility
+
+import gi
+gi.require_version('Gio', '2.0')
+from gi.repository import Gio
+
+def validate(plugin_config, plugin_settings):
+    dbus_proxy = Gio.DBusProxy.new_for_bus_sync(
+        bus_type=Gio.BusType.SESSION,
+        flags=Gio.DBusProxyFlags.DO_NOT_LOAD_PROPERTIES,
+        info=None,
+        name='org.freedesktop.DBus',
+        object_path='/org/freedesktop/DBus',
+        interface_name='org.freedesktop.DBus',
+        cancellable=None,
+    )
+
+    if dbus_proxy.NameHasOwner('(s)', 'org.kde.StatusNotifierWatcher'):
+        return None
+    else:
+        if utility.DESKTOP_ENVIRONMENT == "gnome":
+            return _("Please install a gnome shell plugin providing tray icons, eg. 'Tray Icons Reloaded'")
+        elif utility.IS_WAYLAND:
+            return _("Please install a plugin providing tray icons for your desktop environment")
+        elif utility.DESKTOP_ENVIRONMENT == "lxde":
+            return _("Please install the 'snixembed' service")
+        else:
+            return _("Please install the 'snixembed' service, or a plugin providing tray icons for your desktop environment")
+
+    command = None
+    if utility.IS_WAYLAND:
+        if utility.DESKTOP_ENVIRONMENT == "gnome":
+            return None
+        command = "wlrctl"
+    else:
+        command = "xprop"
+    if not utility.command_exist(command):
+        return _("Please install the command-line tool '%s'") % command
+    else:
+        return None