[rygel] core: Print help string on bad arguments to options

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 11612857c3330ad06b44ae6921d580f99ecb84c6
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Apr 19 18:59:43 2011 +0300

    core: Print help string on bad arguments to options

 src/rygel/rygel-cmdline-config.vala |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/rygel/rygel-cmdline-config.vala b/src/rygel/rygel-cmdline-config.vala
index a3c7c71..20ab6c1 100644
--- a/src/rygel/rygel-cmdline-config.vala
+++ b/src/rygel/rygel-cmdline-config.vala
@@ -125,7 +125,14 @@ internal class Rygel.CmdlineConfig : GLib.Object, Configuration {
         opt_context.set_ignore_unknown_options (true);
         opt_context.add_main_entries (options, null);
         opt_context.add_group (Gst.init_get_option_group ());
-        opt_context.parse (ref args);
+
+        try {
+            opt_context.parse (ref args);
+        } catch (OptionError.BAD_VALUE err) {
+            stdout.printf (opt_context.get_help (true, null));
+
+            throw new CmdlineConfigError.VERSION_ONLY ("");
+        }
 
         if (version) {
             stdout.printf ("%s\n", BuildConfig.PACKAGE_STRING);