Command line tool to pretty-print piped JSON in Swift

json.swift

//
//  Created by Simon Westerlund on 22/12/15.
//  Copyright © 2015 Simon Westerlund. All rights reserved.
//

import Foundation

func main() -> Int32 {
    let data = NSFileHandle.fileHandleWithStandardInput().readDataToEndOfFile()
    
    do {
        let jsonObject = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments)
        let jsonData = try NSJSONSerialization.dataWithJSONObject(jsonObject, options: .PrettyPrinted)
        if let json = String(data: jsonData, encoding: NSUTF8StringEncoding) {
            print(json)
            return EXIT_SUCCESS
        } else {
            return EXIT_FAILURE
        }
    } catch (let error as NSError) {
        print(error.localizedDescription)
        return EXIT_FAILURE
    }
}

exit(main())