From http://www.jwz.org/xscreensaver/xscreensaver-5.24.tar.gz

[xscreensaver] / OSX / Updater.m

diff --git a/OSX/Updater.m b/OSX/Updater.m
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+++ b/OSX/Updater.m
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+/* xscreensaver, Copyright (c) 2013 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ *
+ * XScreenSaverUpdater.app -- downloads and installs XScreenSaver updates
+ * via Sparkle.framework.
+ *
+ * Created: 7-Dec-2013
+ *
+ * NOTE: This does not work with Sparkle 1.5b6 -- it requires the "HEAD"
+ *       version 4-Dec-2013 or later.
+ */
+
+#import "Updater.h"
+#import "Sparkle/SUUpdater.h"
+
+@implementation XScreenSaverUpdater : NSObject
+
+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
+{
+  SUUpdater *updater = [SUUpdater updaterForBundle:
+                                    [NSBundle bundleForClass:[self class]]];
+  NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];
+  [defs registerDefaults:UPDATER_DEFAULTS];
+
+  // Launch the updater thread.
+  [updater checkForUpdatesInBackground];
+
+  // Now we need to wait for the Sparkle thread to finish before we can
+  // exit, so just poll waiting for it.
+  [NSTimer scheduledTimerWithTimeInterval:1
+           target:self
+           selector:@selector(exitWhenDone:)
+           userInfo:updater
+           repeats:YES];
+}
+
+- (void) exitWhenDone:(NSTimer *)timer
+{
+  SUUpdater *updater = [timer userInfo];
+  if (![updater updateInProgress])
+    [[NSApplication sharedApplication] terminate:self];
+}
+
+- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)app
+{
+  return YES;
+}
+
+@end