Color ouput with Swift command line tool

Question

I\'m writing a command line tool with Swift and I\'m having trouble displaying colors in my shell. I\'m using the following code:

println(\"\\033[31;32mhey\\033         


        

Answer 1

Expanding upon Diego Freniche's answer we can incorporate the functionality of Rainbow, as referenced in Uncharted Works's Answer, without needing to import the framework itself using a simple String extension:

enum ANSIColor: String {

    typealias This = ANSIColor

    case black = "\u{001B}[0;30m"
    case red = "\u{001B}[0;31m"
    case green = "\u{001B}[0;32m"
    case yellow = "\u{001B}[0;33m"
    case blue = "\u{001B}[0;34m"
    case magenta = "\u{001B}[0;35m"
    case cyan = "\u{001B}[0;36m"
    case white = "\u{001B}[0;37m"
    case `default` = "\u{001B}[0;0m"

    static var values: [This] {
        return [.black, .red, .green, .yellow, .blue, .magenta, .cyan, .white, .default]
    }

    static var names: [This: String] = {
        return [
            .black: "black",
            .red: "red",
            .green: "green",
            .yellow: "yellow",
            .blue: "blue",
            .magenta: "magenta",
            .cyan: "cyan",
            .white: "white",
            .default: "default",
        ]
    }

    var name: String {
        return This.names[self] ?? "unknown"
    }

    static func + (lhs: This, rhs: String) -> String {
        return lhs.rawValue + rhs
    }

    static func + (lhs: String, rhs: This) -> String {
        return lhs + rhs.rawValue
    }

}

extension String {

    func colored(_ color: ANSIColor) -> String {
        return color + self + ANSIColor.default
    }

    var black: String {
        return colored(.black)
    }

    var red: String {
        return colored(.red)
    }

    var green: String {
        return colored(.green)
    }

    var yellow: String {
        return colored(.yellow)
    }

    var blue: String {
        return colored(.blue)
    }

    var magenta: String {
        return colored(.magenta)
    }

    var cyan: String {
        return colored(.cyan)
    }

    var white: String {
        return colored(.white)
    }

}