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They work together to provide "reporting" for the htsn and htsn-import
executables which both display and log things in the same way.
The Network.Services.TSN.Logging module allows the application to
log to syslog, a file, or both. Four convenience functions are
provided to log messages at each priority: error, debug, info, and
warn.
The Network.Services.TSN.Terminal provides similar functions that
instead display messages on the console (terminal). The output is
color-coded according to the severity of the message.
The Network.Services.TSN.Report modules contains convenience
functions that both log and display informational message. This is
what an (optionally interactive) application will usually want to
do.