console_handler.mbt

///|
/// Console handler that prints formatted log output to stdout.
pub(all) struct ConsoleHandler {
  level : Level
  fmt : (LogEntry) -> String
  use_stderr : Bool
}

///|
/// Creates a new ConsoleHandler with the given minimum level and formatter.
pub fn ConsoleHandler::new(
  level : Level,
  fmt : (LogEntry) -> String,
) -> ConsoleHandler {
  { level, fmt, use_stderr: false }
}

///|
/// Sets whether output goes to stderr. Returns a new handler.
pub fn ConsoleHandler::with_stderr(
  self : ConsoleHandler,
  v : Bool,
) -> ConsoleHandler {
  { ..self, use_stderr: v }
}

///|
/// Logs an entry if its level meets the configured threshold.
pub fn ConsoleHandler::log(self : ConsoleHandler, entry : LogEntry) -> Unit {
  if entry.level.enabled(self.level) {
    let line = (self.fmt)(entry)
    println(line)
  }
}

///|
/// Flushes buffered output. No-op for console handler.
pub fn ConsoleHandler::flush(self : ConsoleHandler) -> Unit {
  let _ = self
}

///|
/// Closes the handler and releases resources. No-op for console handler.
pub fn ConsoleHandler::close(self : ConsoleHandler) -> Unit {
  let _ = self
}