gistfile1.txt

#import <Foundation/Foundation.h>
#import <Carbon/Carbon.h>

int main(int argc, const char * argv[])
{

  @autoreleasepool {
      
    // get list of running apps
    NSMutableArray *runningApps = [NSMutableArray array];
    
    ProcessSerialNumber psn = { kNoProcess, kNoProcess };
    while (GetNextProcess(&psn) == noErr) {
      CFDictionaryRef cfDict = ProcessInformationCopyDictionary(&psn,  kProcessDictionaryIncludeAllInformationMask);
      if (cfDict) {
        NSDictionary *dict = (NSDictionary *)CFBridgingRelease(cfDict);
        [runningApps addObject:[dict objectForKey:(id)kCFBundleNameKey]];
      }
    }
    
    // decide which app to open
    NSString *appPath = @"/Applications/Dux.app";
    if ([runningApps containsObject:@"Xcode"]) {
      appPath = @"/Applications/Xcode.app";
    }
    
    // open it
    [NSTask launchedTaskWithLaunchPath:@"/usr/bin/open" arguments:@[appPath]];
    
  }
  
  return 0;
}