Swift Async

[maxxfrazer]

• Added async option for Swift code snippet options.
  • Default as false, traditional completion handler style.
• Changed EXIT_SUCCESS on existing version to EXIT_FAILURE where it actually fails.

The async code looks like:

do {
    let (data, response) = try await URLSession.shared.data(for: request)
    print(String(data: data, encoding: .utf8)!)
    exit(EXIT_SUCCESS)
} catch {
    print("A URL error occurred: \(error)")
    exit(EXIT_FAILURE)
}

Current non-async code:

let task = URLSession.shared.dataTask(with: request) { data, response, error in 
    guard let data = data else {
        print(String(describing: error))
        exit(EXIT_FAILURE)
    }
    print(String(data: data, encoding: .utf8)!)
    exit(EXIT_SUCCESS)
}

IMO the async method should be default, but wanted to get your feedback first!

I have noted in ADDITIONAL_DEPENDENCIES.md that the swift version should be a minimum of 5.5 (released Sept 2021)

[maxxfrazer]

@dhwaneetbhatt @SahilChoudhary22 you helped me with my last Swift codegen update, hopefully you see this as an improvement too!

[maxxfrazer]

TIL await URLSession.shared.data isn't available on linux? will take a deeper dive.

[maxxfrazer]

Going to skip this PR. Unfortunately async isn’t available on Linux exactly the same way as it is for iOS/macOS etc.
I think a huge majority of Swift developers would benefit from it, but unfortunately not all of them.