main: logging enabled from command line

src/main.vala

@@ -17,9 +17,28 @@
  * AUTHORS
  * Maciek Borzecki <maciek.borzecki (at] gmail.com>
  */
+private static bool log_debug = false;
+
+private const GLib.OptionEntry[] options = {
+	{"debug", 'd', 0, OptionArg.NONE, ref log_debug, "Show debug output", null},
+	{null}
+};
 
 public static int main(string[] args)
 {
+	try {
+		var opt_context = new OptionContext ("mconnect");
+		opt_context.set_help_enabled (true);
+		opt_context.add_main_entries (options, null);
+		opt_context.parse (ref args);
+	} catch (OptionError e) {
+		stdout.printf ("error: %s\n", e.message);
+		stdout.printf ("Run '%s --help' to see a full list of available command line options.\n", args[0]);
+		return 0;
+	}
+
+	if (log_debug == true)
+		Environment.set_variable("G_MESSAGES_DEBUG", "all", false);
 	Notify.init("mconnect");
 
 	var core = Core.instance();