logging

type Logger interface {
	// Debug logging of raw socket comms to/from server.
	Debug(format string, args ...interface{})
	// Informational logging about client behaviour.
	Info(format string, args ...interface{})
	// Warnings of inconsistent or unexpected data, mostly
	// related to state tracking of IRC nicks/chans.
	Warn(format string, args ...interface{})
	// Errors, mostly to do with network communication.
	Error(format string, args ...interface{})
}