An old script of mine that tries to convert a string into Slack flag codes

text-to-flags.swift

// DEVELOPER_DIR=/Applications/Xcode9-beta.app/Contents/Developer/  swift text-to-flags.swift
import Foundation

let input = CommandLine.arguments[1].uppercased()

if input.rangeOfCharacter(from: CharacterSet(charactersIn: "ABCDEFGHIJKLMNOPQRSTUVWXYZ").inverted) != nil {
	fatalError("unsupported character found")
}

func request(_ r: URLRequest) -> [String] {
    
    var shouldExit = false
    
    var s: [String] = []
    
    let task = URLSession.shared.dataTask(with: r) { (data, _, error) in
        
        defer {
            shouldExit = true
        }
        
		s = (try! JSONSerialization.jsonObject(with: data!, options: [])) as! [String]		
    }
    
    task.resume()

    while !shouldExit { }
    
    return s
}


let r = URLRequest(url: URL(string: "https://wrapapi.com/use/maxchuquimia/texttoflags/flags/0.0.1?wrapAPIKey=EhmzOcggZNsYoZgl120hmf8zbUDph8u8")!)
let result = request(r) + [""]


var inputLetters = Array(input).map({ String($0) })
var output = ""

while inputLetters.count > 0 {

    let a = inputLetters.removeFirst()    
    
	if a.isEmpty {
         break
	}

	var b = ""
	if inputLetters.count > 0 {
        b = inputLetters.removeFirst()    
	}
	
    if result.contains("\(a)\(b)") {
		// Raw flag
	    output = output + ":flag-\(a.lowercased())\(b.lowercased()):"
	} else if result.contains("\(a)\(a)") && result.contains("\(b)\(b)") {
	    output = output + ":flag-\(a.lowercased())\(a.lowercased()):"

	    if b.characters.count > 0 {
	        // If b has no characters then we are at the end of the input string
		    output = output + ":flag-\(b.lowercased())\(b.lowercased()):" 
	    }
    } else if result.contains("\(a)\(a)") {
	    // Flag with both first characters, need to repeat with b
	    output = output + ":flag-\(a.lowercased())\(a.lowercased()):"
	    inputLetters.insert(b, at: 0)
	} else {
	
		var didFind = false

		for panic in ["A", "E", "I", "O", "U", "M", "N", "L"] {
            if result.contains("\(a)\(panic)") {
			    didFind = true
				output = output + ":flag-\(a.lowercased())\(panic.lowercased()):"
				break
			}	
		}

		if !didFind {
 		    output = output + a
		}

        inputLetters.insert(b, at: 0)
	}
}

print("\(input) -> \(output)")