GetInstance returns the Logger instance.

NewStreamLogger creates a new stream logger.

PrintTable prints a table with header columns and string values.

SetFakePrintTable is a testing tool that allows overwriting the function PrintTable.

SetInstance sets the default logger instance.

Discard is a logger implementation that just discards every log statement.

DiscardLogger just discards every log statement.

StreamLogger logs all messages to a stream.

SurveyError is used to identify errors where questions were asked in the discard logger.

Logger defines the common logging interface.