swift4-logger-service.swift

swift4-logger-service.swift

public class Logger {
    fileprivate enum Prefix: String {
        case Info = "🍀"
        case Warn = "🍋"
        case Error = "🍎"
        case Happy = "🎀"
    }
    
    public static func info(_ items: String...) {
        print(serialize(items, prefix: .Info))
    }
    
    public static func warn(_ items: String...) {
        print(serialize(items, prefix: .Warn))
    }
    
    public static func error(_ items: String...) {
        print(serialize(items, prefix: .Error))
    }
    
    public static func happy(_ items: String...) {
        print(serialize(items, prefix: .Happy))
    }
    
    private static func serialize(_ items: [String], prefix: Prefix) -> String {
        return items.map { $0
            .replacingOccurrences(of: "\n", with: "\n\(prefix.rawValue)    ", options: .regularExpression, range: nil)
            .replacingOccurrences(of: "^", with: "\(prefix.rawValue)   ", options: .regularExpression, range: nil)
            .replacingOccurrences(of: "$", with: "\n", options: .regularExpression, range: nil)
            }.joined()
    }
}

example

Logger.info("Info")
Logger.warn("Warning")
Logger.error("Error")
Logger.happy("Happy!")

output