Say you have a Mac app and you want to run a script, either to perform some action, or to return something, here's one way to do it.
First, we create an
NSTask, set the launch path of the handler, in our case
ruby (we will use the default one, to be sure it exists), and the required parameters, if required:
let task = NSTask() task.launchPath = "/usr/bin/ruby" task.arguments = [ NSBundle.mainBundle().pathForResource(myScript, ofType: "rb")!, parameter1 ]
This would be the same as running in the terminal:
ruby /path/to/myScript parameter1
All good, but what if the script returns something and we want to use that?
NSPipe to the rescue:
let pipe = NSPipe() task.standardOutput = pipe task.launch() let resultData = pipe.fileHandleForReading.readDataToEndOfFile() let resultString = String(data: resultData, encoding: NSUTF8StringEncoding)
Returning a value with a script is as easy as printing:
def optional_method 'I am the return value' end puts optional_method + ' of a script'
This would result in
resultString's value to be I am the return value of a script.