Module Console

Jan Burse, created May 07. 2019
* Read line utility based on ISO core standard.
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:- module(console, [read_line/1]).
* read_line(X):
* read_line(S, X):
* The predicate suceeds in X with a line, not including the end of
* line characters, or fails if we are at end of file. The binary
* arity predicate allows specifying an input stream.
% read_line(-Atom)
read_line(S, X).
% read_line(+Stream, -Atom)
get_code(S, C),
read_line(S, C, L),
atom_codes(X, L).
% read_line(+Stream, +Code, -List)
read_line(_, -1, _) :- !, fail.
read_line(_, 0'\n, []) :- !.
read_line(S, C, [C|L]) :-
get_code(S, D),
read_line2(S, D, L).
% read_line2(+Stream, +Code, -List)
read_line2(_, -1, []) :- !.
read_line2(_, 0'\n, []) :- !.
read_line2(S, C, [C|L]) :-
get_code(S, D),
read_line2(S, D, L).