NSTask Async output to NSTaskView

NSTaskAsyncOutput.mm

NSMutableArray *arguments = [[NSMutableArray alloc] init];
[arguments addObject:[[NSBundle mainBundle] pathForResource:@"MyScript" ofType:@"py"]];
[arguments addObject:@"--verbose"]; // Any arguments you want here...

NSTask* task = [[NSTask alloc] init];
task.launchPath = @"/usr/bin/python";
task.arguments  = arguments;

NSMutableDictionary *defaultEnv = [[NSMutableDictionary alloc] initWithDictionary:[[NSProcessInfo processInfo] environment]];
[defaultEnv setObject:@"YES" forKey:@"NSUnbufferedIO"] ;
task.environment = defaultEnv;

task.standardOutput = [NSPipe pipe];
[[task.standardOutput fileHandleForReading] setReadabilityHandler:^(NSFileHandle *file) {
    NSData *data = [file availableData]; // this will read to EOF, so call only once
    NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"Task output! %@", string);

    dispatch_async(dispatch_get_main_queue(), ^{
        _logField.string = [_logField.string stringByAppendingString: string];
        [_logField scrollRangeToVisible: NSMakeRange(_logField.string.length, 0)];
    });
}];

[task launch];