Only produce color error message when outputting to terminal #129
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Context
In #121, we added color to some of the error messages produced by pnut (when
NICE_ERR_MSG
is on). Howver, we forgot to take into account that the output of pnut is often redirected to a file, where we don't want to see color codes.Fortunately, the
test
POSIX shell utility can be used to check what a file descriptor is a terminal, which allows pnut to only output color codes when stdout is a terminal.