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Source pdt_install_console
Support get_single_char/1 in PDT console. This predicate modifies user_input and user_output as follows:
  • If single-char mode is enabled, write "ESC s" over the user output and then wait for two characters, returning the first.
  • Output is changed to emit ESC as ESC ESC.

This protocol was designed for PDT by Lukas Degener. The original implementation was partly in Prolog. This is a full C implementation, both for speed.