UI: Rename 'obs' dir to 'UI'

This is to prevent confusion both when prefixing commits and when
reading the directory structure for the first time.

UI/sparkle-updater.mm

@@ -0,0 +1,144 @@
+#import <Cocoa/Cocoa.h>
+#import <Sparkle/Sparkle.h>
+
+static inline bool equali(NSString *a, NSString *b)
+{
+	return a && b && [a caseInsensitiveCompare:b] == NSOrderedSame;
+}
+
+@interface OBSSparkleUpdateDelegate :
+	NSObject<SUUpdaterDelegate, SUVersionComparison>
+{
+}
+@property (nonatomic) bool updateToUndeployed;
+@end
+
+@implementation OBSSparkleUpdateDelegate
+{
+}
+
+@synthesize updateToUndeployed;
+
+- (SUAppcastItem *)bestValidUpdateWithDeltasInAppcast:(SUAppcast *)appcast
+					   forUpdater:(SUUpdater *)updater
+{
+	SUAppcastItem *item = appcast.items.firstObject;
+	if (!appcast.items.firstObject)
+		return nil;
+
+	SUAppcastItem *app = nil, *mpkg = nil;
+	for (SUAppcastItem *item in appcast.items) {
+		NSString *deployed = item.propertiesDictionary[@"ce:deployed"];
+		if (deployed && !(deployed.boolValue || updateToUndeployed))
+			continue;
+
+		NSString *type = item.propertiesDictionary[@"ce:packageType"];
+		if (!mpkg && (!type || equali(type, @"mpkg")))
+			mpkg = item;
+		else if (!app && type && equali(type, @"app"))
+			app = item;
+
+		if (app && mpkg)
+			break;
+	}
+
+	if (app)
+		item = app;
+
+	NSBundle *host = updater.hostBundle;
+	if (mpkg && (!app || equali(host.bundlePath, @"/Applications/OBS.app")))
+		item = mpkg;
+
+	NSMutableDictionary *dict = [NSMutableDictionary
+			dictionaryWithDictionary:item.propertiesDictionary];
+	NSString *build = [host objectForInfoDictionaryKey:@"CFBundleVersion"];
+	NSString *url = dict[@"sparkle:releaseNotesLink"];
+	dict[@"sparkle:releaseNotesLink"] = [url stringByAppendingFormat:@"#%@",
+		build];
+
+	return [[SUAppcastItem alloc] initWithDictionary:dict];
+}
+
+- (SUAppcastItem *)bestValidUpdateInAppcast:(SUAppcast *)appcast
+				 forUpdater:(SUUpdater *)updater
+{
+	SUAppcastItem *selected =
+			[self bestValidUpdateWithDeltasInAppcast:appcast
+						      forUpdater:updater];
+
+	NSBundle *host = updater.hostBundle;
+	NSString *build = [host objectForInfoDictionaryKey:@"CFBundleVersion"];
+	SUAppcastItem *deltaUpdate = [selected deltaUpdates][build];
+	if (deltaUpdate)
+		return deltaUpdate;
+
+	return selected;
+}
+
+- (NSString *)feedURLStringForUpdater:(SUUpdater *)updater
+{
+	//URL from Info.plist takes precedence because there may be bundles with
+	//differing feed URLs on the system
+	NSBundle *bundle = updater.hostBundle;
+	return [bundle objectForInfoDictionaryKey:@"SUFeedURL"];
+}
+
+- (NSComparisonResult)compareVersion:(NSString *)versionA
+			   toVersion:(NSString *)versionB
+{
+	if (![versionA isEqual:versionB])
+		return NSOrderedAscending;
+	return NSOrderedSame;
+}
+
+- (id <SUVersionComparison>)
+	versionComparatorForUpdater:(SUUpdater *)__unused updater
+{
+	return self;
+}
+
+@end
+
+static inline bool bundle_matches(NSBundle *bundle)
+{
+	if (!bundle.executablePath)
+		return false;
+
+	NSRange r = [bundle.executablePath rangeOfString:@"Contents/MacOS/"];
+	return [bundle.bundleIdentifier isEqual:@"com.obsproject.obs-studio"] &&
+	       r.location != NSNotFound;
+}
+
+static inline NSBundle *find_bundle()
+{
+	NSFileManager *fm = [NSFileManager defaultManager];
+	NSString *path = [fm currentDirectoryPath];
+	NSString *prev = path;
+	do {
+		NSBundle *bundle = [NSBundle bundleWithPath:path];
+		if (bundle_matches(bundle))
+			return bundle;
+
+		prev = path;
+		path = [path stringByDeletingLastPathComponent];
+	} while (![prev isEqual:path]);
+	return nil;
+}
+
+static SUUpdater *updater;
+
+static OBSSparkleUpdateDelegate *delegate;
+
+void init_sparkle_updater(bool update_to_undeployed)
+{
+	updater = [SUUpdater updaterForBundle:find_bundle()];
+	delegate = [[OBSSparkleUpdateDelegate alloc] init];
+	delegate.updateToUndeployed = update_to_undeployed;
+	updater.delegate = delegate;
+}
+
+void trigger_sparkle_update()
+{
+	[updater checkForUpdates:nil];
+}
+