///|
/// Failures raised while reading, validating, or publishing persisted index
/// state.
pub(all) suberror PersistenceError {
  Closed
  NotFound(String)
  InvalidName(String)
  InvalidFormat(String)
  LockBusy(String)
  AlreadyPrepared
  NotPrepared
  Io(String)
} derive(Eq, @debug.Debug)

///|
pub impl Show for PersistenceError with fn output(self, logger) {
  match self {
    Closed => logger.write_string("index handle is closed")
    NotFound(name) => logger.write_string("index file not found: \{name}")
    InvalidName(name) => logger.write_string("invalid index file name: \{name}")
    InvalidFormat(message) =>
      logger.write_string("invalid index format: \{message}")
    LockBusy(name) => logger.write_string("index writer lock is busy: \{name}")
    AlreadyPrepared =>
      logger.write_string("an index commit is already prepared")
    NotPrepared => logger.write_string("no index commit is prepared")
    Io(message) => logger.write_string("index I/O error: \{message}")
  }
}