Building Echo customizable log format #4. Full post: http://clmntcrl.io/blog/building-echo-customizable-log-format/.

EchoComponent.swift

enum EchoComponent {
  case Datetime(format: String)
  case Flag(flags: [EchoLevel: EchoFlag])
  case Filename
  case Function
  case Line
  case Message
  case Separator(String)
}

EchoFormat.swift

struct Echo {
  var format: [EchoComponent] = [
        .Flag(flags: [.Trace: "💊", .Debug:  "☕️", .Info: "💡", .Warn: "⚠️", .Error: "❌", .Fatal: "💣", .Off: "😶"]),
        .Separator(" ["),
        .Datetime(format: "HH:mm:ss.SSS"),
        .Separator("] ["),
        .Filename,
        .Separator(":"),
        .Line,
        .Separator("] "),
        .Message
    ]
}