Debug logs a message with severity DEBUG.

Error logs a message with severity ERROR.

Fatal logs a message with severity ERROR which is then followed by a call to os.Exit().

Info logs a message with severity INFO.

IsDebug returns true if current level is debug.

IsError returns true if current level is error.

IsFatal returns true if current level is fatal.

IsInfo returns true if current level is info.

IsPanic returns true if current level is panic.

IsWarning returns true if current level is warn.

SetLevel sets the log level.

Warning logs a message with severity WARNING.

Formatter is the struct used in the logging package.