Emcee

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import Foundation
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public final class NSLogLikeLogEntryTextFormatter: LogEntryTextFormatter {
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    // 2018-03-29 19:05:01.994
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    public static let logDateFormatter: DateFormatter = {
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        let logFormatter = DateFormatter()
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        logFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
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        logFormatter.timeZone = TimeZone.autoupdatingCurrent
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        return logFormatter
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    }()
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    public init() {}
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    public func format(logEntry: LogEntry) -> String {
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        let timeStamp = NSLogLikeLogEntryTextFormatter.logDateFormatter.string(from: logEntry.timestamp)
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        let filename = (logEntry.file as NSString).lastPathComponent
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        // [LEVEL] 2018-03-29 19:05:01.994 <file:line> <coordinate1> [<coordinate2> [...]]: <mesage>
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        var result = "[\(logEntry.verbosity.stringCode)] \(timeStamp) \(filename):\(logEntry.line)"
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        if !logEntry.coordinates.isEmpty {
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            result += " " + logEntry.coordinates.map { "\($0.stringValue)" }.joined(separator: " ")
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        }
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        result += ": " + logEntry.message
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        return result
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    }
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}
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extension LogEntryCoordinate {
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    public var stringValue: String {
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        var result = name
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        if let value = value {
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            result += ":\(value)"
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        }
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        return result
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    }
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}
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