Add a -V/--version option, printing the version

src/application.py

@@ -28,6 +28,9 @@ class GajimApplication(Gtk.Application):
     def __init__(self):
         Gtk.Application.__init__(self, application_id='org.gajim.Gajim',
                                  flags=Gio.ApplicationFlags.HANDLES_COMMAND_LINE)
+        self.add_main_option('version', ord('V'), GLib.OptionFlags.NONE,
+                             GLib.OptionArg.NONE,
+                             _('Show the application\'s version'))
         self.add_main_option('quiet', ord('q'), GLib.OptionFlags.NONE,
                              GLib.OptionArg.NONE,
                              _('Show only critical errors'))

src/gajim.py

@@ -35,8 +35,14 @@
 ## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 ##
 
-import os
 import sys
+
+if '--version' in sys.argv or '-V' in sys.argv:
+    from common.defs import version
+    print(version)
+    sys.exit(0)
+
+import os
 import warnings
 import OpenSSL