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The following predicates form a simple access mechanism to the Unix termcap library to provide terminal-independent I/O for screen terminals. These predicates are only available on Unix machines. The SWI-Prolog Windows console accepts the ANSI escape sequences.
bool. String results are returned as an atom, number results as an integer, and bool results as the atom
off. If an option cannot be found, this predicate fails silently. The results are only computed once. Successive queries on the same capability are fast.
user_inputstream. As a fallback, the system uses tty_get_capability/3 using
cocapabilities. In this case the reported size reflects the size at the first call and is not updated after a user-initiated resize of the terminal.
user_inputstream is used.