fetch json via URL and dumps it

json.swift

import Foundation
if C_ARGC < 2 { 
   println("\(C_ARGV[0]) url")
   exit(-1)
}
let url = NSURL.URLWithString(String.fromCString(C_ARGV[1]))
var enc:NSStringEncoding = NSUTF8StringEncoding
var err:NSError?
let content = 
    NSString.stringWithContentsOfURL(url, usedEncoding:&enc, error:&err)
if err {
    NSLog("error: %@", err!)
    exit(-1)
}
let json = NSJSONSerialization.JSONObjectWithData(
    content.dataUsingEncoding(enc), options:nil, error: &err
)
if err {
    NSLog("error: %@", err!)
    exit(-1)
}
println(json)

json2.swift

import Foundation

func fetch(u:String) -> String? {
     let url = NSURL.URLWithString(u)
     var enc:NSStringEncoding = NSUTF8StringEncoding
     var err:NSError?
     let str:String? =
         NSString.stringWithContentsOfURL(url, usedEncoding:&enc, error:&err)
     if err { NSLog("error: %@", err!) }
     return str
}

class JSON {
    class func parse(str:String) -> AnyObject? {
        var err:NSError?
        let enc = NSUTF8StringEncoding
        var obj:AnyObject? = NSJSONSerialization.JSONObjectWithData(
            str.dataUsingEncoding(enc), options:nil, error:&err
        )
        if err { NSLog("error: %@", err!) }
        return obj
    }
    class func stringify(obj:AnyObject) -> String? {
        var err:NSError?
        let data = NSJSONSerialization.dataWithJSONObject(
            obj, options:nil, error:&err
        )
        if err {
            NSLog("error: %@", err!)
            return nil
        }
        return NSString(data:data, encoding:NSUTF8StringEncoding)
    }
}

if C_ARGC > 1 {
  if let content = fetch(String.fromCString(C_ARGV[1])) {
    if let json:AnyObject? = JSON.parse(content) {
      println(json)
      println(JSON.stringify(json!))
      exit(0)
    }
  }
} else {
  println("\(C_ARGV[0]) url")
}
exit(-1)