Sample with stdin loop reading in swift

input.swift

func trim(str: String) ->String {
    return str.stringByTrimmingCharactersInSet(NSCharacterSet.newlineCharacterSet())
}

func input() -> String? {
    var keyboard = NSFileHandle.fileHandleWithStandardInput()
    var inputData = keyboard.availableData
    var result: String? = nil
    if inputData.length != 0 {
        result = NSString(data: inputData, encoding:NSUTF8StringEncoding) as? String
        result = trim(result!)
    }
    return result
}

while let line = input() {
    println("Test: \(line)")
}