To save a record of program execution in prolog, we use the special predicates: protocol and noprotocol. Like this:
protocol(‘execution.txt’).
noprotocol.
All the queries and their responses between the protocol and noprotocol will be saved to this file.
If we use these predicates, we will get records like this:
11 ?- beside(block2, X).
X = block3 [1m;[0m
[1;31mfalse.[0m
12 ?- beside(block4, X).
X = block7 [1m;[0m
X = block3 [1m;[0m
[1;31mfalse.[0m
The characters [1m [0m looks like garbage characters but they are ANSI terminal codes. We can get the reference from here:
http://wiki.bash-hackers.org/scripting/terminalcodes
As we can see from the link above, [0m refers to reset all attributes and [1m refers to set bright attribute.
If we want to disable these codes, we can use predicate: set_prolog_flag(color_term, false). before starting the protocol session.
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