Initialize Sparkle on application launch and add delegate methods

native/atom_application.mm

@@ -4,6 +4,7 @@
 #import "native/atom_window_controller.h"
 #import "native/atom_cef_app.h"
 #import <getopt.h>
+#import <Sparkle/Sparkle.h>
 
 @implementation AtomApplication
 
@@ -221,6 +222,11 @@
 }
 
 - (void)applicationWillFinishLaunching:(NSNotification *)notification {
+  SUUpdater.sharedUpdater.delegate = self;
+  SUUpdater.sharedUpdater.automaticallyChecksForUpdates = YES;
+  SUUpdater.sharedUpdater.automaticallyDownloadsUpdates = YES;
+  [SUUpdater.sharedUpdater checkForUpdatesInBackground];
+
   _backgroundWindowController = [[AtomWindowController alloc] initInBackground];
   if ([self.arguments objectForKey:@"benchmark"]) {
     [self runBenchmarksThenExit:true];
@@ -260,4 +266,26 @@
   }
 }
 
+#pragma mark SUUpdaterDelegate
+
+- (void)updaterDidNotFindUpdate:(SUUpdater *)update {
+  NSLog(@"No update found");
+}
+
+- (void)updater:(SUUpdater *)updater didFindValidUpdate:(SUAppcastItem *)update {
+  NSLog(@"Found Update");
+}
+
+- (void)updater:(SUUpdater *)updater willExtractUpdate:(SUAppcastItem *)update {
+  NSLog(@"Extract update");
+}
+
+- (void)updater:(SUUpdater *)updater willInstallUpdateOnQuit:(SUAppcastItem *)update immediateInstallationInvocation:(NSInvocation *)invocation {
+  NSLog(@"Install Update");
+}
+
+- (void)updater:(SUUpdater *)updater didCancelInstallUpdateOnQuit:(SUAppcastItem *)update {
+  NSLog(@"Cancel Update Install");
+}
+
 @end