/* Title: Pure/General/logger.scala
Author: Makarius
Minimal logging support.
*/
package isabelle
object Logger {
def make(log_file: Option[Path]): Logger =
log_file match { case Some(file) => new File_Logger(file) case None => No_Logger }
def make(progress: Progress): Logger =
new Logger { def apply(msg: => String): Unit = progress.echo(msg) }
}
trait Logger {
def apply(msg: => String): Unit
def timeit[A](message: String = "", enabled: Boolean = true)(e: => A): A =
Timing.timeit(message, enabled, apply(_))(e)
}
object No_Logger extends Logger {
def apply(msg: => String): Unit = {}
}
class File_Logger(path: Path) extends Logger {
def apply(msg: => String): Unit = synchronized { File.append(path, msg + "\n") }
override def toString: String = path.toString
}