gistfile1.m

-(BOOL)appIsPresentInLoginItems
{
    NSString *bundleID = @"blah";
    NSArray * jobDicts = nil;
    jobDicts = (NSArray *)SMCopyAllJobDictionaries( kSMDomainUserLaunchd );
    
    if ( (jobDicts != nil) && [jobDicts count] > 0 ) {
        
        BOOL bOnDemand = NO;
        
        for ( NSDictionary * job in jobDicts ) {
            
            if ( [bundleID isEqualToString:[job objectForKey:@"Label"]] ) {
                bOnDemand = [[job objectForKey:@"OnDemand"] boolValue];
                break;
            } 
        }
        
        CFRelease((CFDictionaryRef)jobDicts); jobDicts = nil;
        return bOnDemand;
        
    } 
    return NO;
}

gistfile2.rb

HELPER_BUNDLE_ID = 'blah'

def launchesAtLogin?
  SMCopyAllJobDictionaries(KSMDomainUserLaunchd).any? do |job|
    job['Label'] == HELPER_BUNDLE_ID && job['OnDemand']
  end
end