Scripting in Swift - Commands #1. Full post: http://clmntcrl.io/blog/scripting-in-swift-commands/

script.swift

enum Command: String {
    case Command1, Command2
}

func main(args: [String]) {
    guard let arg1 = args.first,
              command = Command(rawValue: arg1.capitalizedString) else {
        // Maybe it would be a good thing to print some help...
        return
    }
    switch command {
    case .Command1: // ...
    case .Command2: // ...
    }
}

let args = Process.arguments.dropFirst()
main(args)