Kurtis Rader d7bc20c933 don't allow f-k-r to run if stdin/stdout not a tty ...

Another developer noticed that redirecting stdin of `fish_key_reader`
results in weird behavior.  Which is not at all surprising. So add checks
to ensure stdin and stdout are attached to a tty.

Add some rudimentary unit tests for this program.

2016-06-26 21:51:00 -07:00

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