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Fix #3128
The signature of the callback function did not define the
communicator
causing an exception to be thrown. The callback function is improved to
make the formatted messages easier to read. The main command also has
extra information message echoed to explain to the user how to interrupt
the command. Finally, the usage of a
Future
to block the threadindefinitely has been replaced by a simple while loop calling
sleep
because the future was swallowing the keyboard interrupt, making it
impossible to exit from the command that way.