gistfile1.txt

    double max = [URLs count];
    [importProgress setMaxValue:max];
    
    [NSApp beginSheet:importSheet
       modalForWindow:libraryWindow
        modalDelegate:self
       didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
          contextInfo:nil];
    
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    
        for(NSURL* aURL in URLs)
        {
            if(self.cancelImport)
            {
                self.cancelImport = NO;
                break;
            }
            
            NSString* aPath = [aURL path];
            
            [aPath retain];
                    
            dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                
                [self.database addGamesFromPath:aPath toCollection:nil searchSubfolders:YES];
                
            });
            
            [importCurrentItem setStringValue:[[aPath lastPathComponent] stringByDeletingPathExtension]];
            [importProgress incrementBy:1.0];
            
            [importSheet display];
            
            [aPath release];
        }
        
        [NSApp endSheet:importSheet];
    });