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- (NSString *)firstAvailableFilename:(NSString *)filename
{
    while (![self isFilenameAvailable:filename])
    {
        filename = [filename ks_stringByIncrementingPath];
    }
}

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- (CGImageRef)renderImage:(CIImage *)scaledImage fromSource:(CIImage *)sourceImage;
{
    // We want sRGB as fallback output colorspace
    CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
    
    CIContext *context = [CIContext contextWithCGContext:nil
                                                 options:[NSDictionary dictionaryWithObjectsAndKeys:
                                                          colorSpace, kCIContextOutputColorSpace,
                                                          nil]];
    

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- (BOOL)hardResetContext:(NSManagedObjectContext *)context store:(NSPersistentStore *)store;
{
    NSPersistentStoreCoordinator *storeCoordinator = [context persistentStoreCoordinator];
    if (![storeCoordinator removePersistentStore:myStore error:NULL])
    {
        return NO;
    }
    
    return [storeCoordinator addPersistentStoreWithType:[store type]
                                          configuration:nil

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- (void)restoreDocumentWindowWithIdentifier:(NSString *)identifier state:(NSCoder *)state completionHandler:(void (^)(NSWindow *, NSError *))completionHandler;
{
    if ([identifier isEqualToString:@"Secondary"])
    {
        // Rely on main controller to create secondary window
        if (![[self windowControllers] count]) [self makeWindowControllers];
        MyWindowController *mainController = [[self windowControllers] objectAtIndex:0];
        completionHandler([[mainController secondaryWindowController] window], nil);
    }
    else

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@implementation MySecondaryWindowController

- (void)windowDidLoad
{	
    [super windowDidLoad];
    [[self window] setIdentifier:@"Secondary"];
}

@end

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- (void)clearUndoHistoryOfDoc:(NSDocument *)doc
{
    NSUndoManager *undoManager = [doc undoManager];
    
    // Post a checkpoint first so any pending registrations
    // (e.g. from Core Data) are committed
    [[NSNotificationCenter defaultCenter]
       postNotificationName:NSUndoManagerCheckpointNotification
       object:undoManager];
    

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@implementation NSAlert (Karelia)

- (void)ks_setMessageTextWithFormat:(NSString *)format, ...;
{
    va_list argList;
    va_start(argList, format);
    NSString *formatted = [[NSString alloc] initWithFormat:format arguments:argList];
    va_end(argList);
    
    [self setMessageText:formatted];

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- (NSWindow *)windowForSheet;
{
    NSWindow *result = [super windowForSheet];
    
    NSWindow *sheet;
    while ((sheet = [result attachedSheet]))
    {
        result = sheet;
    }
    

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- (BOOL)saveAndReturnError:(NSError **)error
{
    NSManagedObjectContext *context = [self managedObjectContext];
  
    __block BOOL result;
    [context performBlockAndWait:^{
        result = [context save:error];
    }];
    
    return result;

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- (BOOL)saveAndReturnError:(NSError **)error
{
    NSManagedObjectContext *context = [self managedObjectContext];
  
    __block BOOL result;
    [context performBlockAndWait:^{
        result = [context save:error];
        if (!result && error) [*error retain];
    }];
    if (!result && error) [*error autorelease];