kotlin-desktop-toolkit/src/main/kotlin/org/jetbrains/desktop/macos/Logger.kt [34:193]:
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public interface AppenderInterface {
    public val isTraceEnabled: Boolean
    public val isDebugEnabled: Boolean
    public val isInfoEnabled: Boolean
    public val isWarnEnabled: Boolean
    public val isErrorEnabled: Boolean

    public fun trace(message: String)
    public fun debug(message: String)
    public fun info(message: String)
    public fun warn(message: String)
    public fun error(message: String)

    public fun trace(t: Throwable, message: String)
    public fun debug(t: Throwable, message: String)
    public fun info(t: Throwable, message: String)
    public fun warn(t: Throwable, message: String)
    public fun error(t: Throwable, message: String)
}

internal class DefaultConsoleAppender(
    override val isTraceEnabled: Boolean,
    override val isDebugEnabled: Boolean,
    override val isInfoEnabled: Boolean,
    override val isWarnEnabled: Boolean,
    override val isErrorEnabled: Boolean,
) : AppenderInterface {

    companion object {
        fun fromLevel(level: LogLevel = LogLevel.Info): DefaultConsoleAppender {
            return DefaultConsoleAppender(
                isTraceEnabled = LogLevel.Trace.isNoMoreVerbose(level),
                isDebugEnabled = LogLevel.Debug.isNoMoreVerbose(level),
                isInfoEnabled = LogLevel.Info.isNoMoreVerbose(level),
                isWarnEnabled = LogLevel.Warn.isNoMoreVerbose(level),
                isErrorEnabled = LogLevel.Error.isNoMoreVerbose(level),
            )
        }
    }

    override fun trace(message: String) {
        System.err.println("[TRACE] $message")
    }

    override fun trace(t: Throwable, message: String) {
        System.err.println("[TRACE] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun debug(message: String) {
        System.err.println("[DEBUG] $message")
    }

    override fun debug(t: Throwable, message: String) {
        System.err.println("[DEBUG] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun info(message: String) {
        System.err.println("[INFO] $message")
    }

    override fun info(t: Throwable, message: String) {
        System.err.println("[INFO] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun warn(message: String) {
        System.err.println("[WARN] $message")
    }

    override fun warn(t: Throwable, message: String) {
        System.err.println("[WARN] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun error(message: String) {
        System.err.println("[ERROR] $message")
    }

    override fun error(t: Throwable, message: String) {
        System.err.println("[ERROR] $message")
        System.err.println(t.stackTraceToString())
    }
}

public object Logger {
    public var appender: AppenderInterface = DefaultConsoleAppender.fromLevel(LogLevel.Info)

    public inline fun trace(msg: () -> String) {
        if (appender.isTraceEnabled) {
            appender.trace(msg())
        }
    }

    public inline fun debug(msg: () -> String) {
        if (appender.isDebugEnabled) {
            appender.debug(msg())
        }
    }

    public inline fun info(msg: () -> String) {
        if (appender.isInfoEnabled) {
            appender.info(msg())
        }
    }

    public inline fun warn(msg: () -> String) {
        if (appender.isWarnEnabled) {
            appender.warn(msg())
        }
    }

    public inline fun error(msg: () -> String) {
        if (appender.isErrorEnabled) {
            appender.error(msg())
        }
    }

    public inline fun trace(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isTraceEnabled) {
            appender.trace(t, msg())
        }
    }

    public inline fun debug(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isDebugEnabled) {
            appender.debug(t, msg())
        }
    }

    public inline fun info(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isInfoEnabled) {
            appender.info(t, msg())
        }
    }

    public inline fun warn(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isWarnEnabled) {
            appender.warn(t, msg())
        }
    }

    public inline fun error(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isErrorEnabled) {
            appender.error(t, msg())
        }
    }
}

internal fun initLogger(logFile: Path, consoleLogLevel: LogLevel, fileLogLevel: LogLevel, appender: AppenderInterface) {
    ffiDownCall {
        Logger.appender = appender

        Arena.ofConfined().use { arena ->
            val configuration = NativeLoggerConfiguration.allocate(arena)
            val logFileStr = logFile.toAbsolutePath().toString()
            NativeLoggerConfiguration.file_path(configuration, arena.allocateUtf8String(logFileStr))
            NativeLoggerConfiguration.console_level(configuration, consoleLogLevel.toNative())
            NativeLoggerConfiguration.file_level(configuration, fileLogLevel.toNative())
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kotlin-desktop-toolkit/src/main/kotlin/org/jetbrains/desktop/win32/Logger.kt [34:193]:
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public interface AppenderInterface {
    public val isTraceEnabled: Boolean
    public val isDebugEnabled: Boolean
    public val isInfoEnabled: Boolean
    public val isWarnEnabled: Boolean
    public val isErrorEnabled: Boolean

    public fun trace(message: String)
    public fun debug(message: String)
    public fun info(message: String)
    public fun warn(message: String)
    public fun error(message: String)

    public fun trace(t: Throwable, message: String)
    public fun debug(t: Throwable, message: String)
    public fun info(t: Throwable, message: String)
    public fun warn(t: Throwable, message: String)
    public fun error(t: Throwable, message: String)
}

internal class DefaultConsoleAppender(
    override val isTraceEnabled: Boolean,
    override val isDebugEnabled: Boolean,
    override val isInfoEnabled: Boolean,
    override val isWarnEnabled: Boolean,
    override val isErrorEnabled: Boolean,
) : AppenderInterface {

    companion object {
        fun fromLevel(level: LogLevel = LogLevel.Info): DefaultConsoleAppender {
            return DefaultConsoleAppender(
                isTraceEnabled = LogLevel.Trace.isNoMoreVerbose(level),
                isDebugEnabled = LogLevel.Debug.isNoMoreVerbose(level),
                isInfoEnabled = LogLevel.Info.isNoMoreVerbose(level),
                isWarnEnabled = LogLevel.Warn.isNoMoreVerbose(level),
                isErrorEnabled = LogLevel.Error.isNoMoreVerbose(level),
            )
        }
    }

    override fun trace(message: String) {
        System.err.println("[TRACE] $message")
    }

    override fun trace(t: Throwable, message: String) {
        System.err.println("[TRACE] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun debug(message: String) {
        System.err.println("[DEBUG] $message")
    }

    override fun debug(t: Throwable, message: String) {
        System.err.println("[DEBUG] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun info(message: String) {
        System.err.println("[INFO] $message")
    }

    override fun info(t: Throwable, message: String) {
        System.err.println("[INFO] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun warn(message: String) {
        System.err.println("[WARN] $message")
    }

    override fun warn(t: Throwable, message: String) {
        System.err.println("[WARN] $message")
        System.err.println(t.stackTraceToString())
    }

    override fun error(message: String) {
        System.err.println("[ERROR] $message")
    }

    override fun error(t: Throwable, message: String) {
        System.err.println("[ERROR] $message")
        System.err.println(t.stackTraceToString())
    }
}

public object Logger {
    public var appender: AppenderInterface = DefaultConsoleAppender.fromLevel(LogLevel.Info)

    public inline fun trace(msg: () -> String) {
        if (appender.isTraceEnabled) {
            appender.trace(msg())
        }
    }

    public inline fun debug(msg: () -> String) {
        if (appender.isDebugEnabled) {
            appender.debug(msg())
        }
    }

    public inline fun info(msg: () -> String) {
        if (appender.isInfoEnabled) {
            appender.info(msg())
        }
    }

    public inline fun warn(msg: () -> String) {
        if (appender.isWarnEnabled) {
            appender.warn(msg())
        }
    }

    public inline fun error(msg: () -> String) {
        if (appender.isErrorEnabled) {
            appender.error(msg())
        }
    }

    public inline fun trace(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isTraceEnabled) {
            appender.trace(t, msg())
        }
    }

    public inline fun debug(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isDebugEnabled) {
            appender.debug(t, msg())
        }
    }

    public inline fun info(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isInfoEnabled) {
            appender.info(t, msg())
        }
    }

    public inline fun warn(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isWarnEnabled) {
            appender.warn(t, msg())
        }
    }

    public inline fun error(t: Throwable, msg: () -> String = { "" }) {
        if (appender.isErrorEnabled) {
            appender.error(t, msg())
        }
    }
}

internal fun initLogger(logFile: Path, consoleLogLevel: LogLevel, fileLogLevel: LogLevel, appender: AppenderInterface) {
    ffiDownCall {
        Logger.appender = appender

        Arena.ofConfined().use { arena ->
            val configuration = NativeLoggerConfiguration.allocate(arena)
            val logFileStr = logFile.toAbsolutePath().toString()
            NativeLoggerConfiguration.file_path(configuration, arena.allocateUtf8String(logFileStr))
            NativeLoggerConfiguration.console_level(configuration, consoleLogLevel.toNative())
            NativeLoggerConfiguration.file_level(configuration, fileLogLevel.toNative())
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