Building Echo customizable log format #3. Full post: http://clmntcrl.io/blog/building-echo-customizable-log-format/.

EchoComponent.swift

enum EchoComponent {
    case Datetime
    case Flag
    case Filename
    case Function
    case Line
    case Message
    case Separator(String)
}

EchoFormat.swift

struct Echo {
  var format: [EchoComponent] = [
        .Flag,
        .Separator(" ["),
        .Datetime,
        .Separator("] ["),
        .Filename,
        .Separator(":"),
        .Line,
        .Separator("] "),
        .Message
    ]
}