One can easily consult a Prolog file using consult/1 or [filename]..
Suppose I generate Prolog code as an atom. I can in a predicate write that code to a file and then consult it, and query a predicate from that code, e.g.
example :-
generate_stuff(X),
write_to_file(X,'filename.pl'),
consult('filename.pl'),
predicate_in_filename.
How would I go about doing the same thing but without writing X (the code) to a file? I'm having no luck with assert which takes a term as input whereas here I have complete code in an atom.
The clean way is of course to not even produce an atom in the first place, but a more structured representation from the start.
However, if you really want to use atoms and later treat them as structured terms, use atom_to_term/3, then assert the clause.
For example:
?- atom_to_term('p(X, Y) :- dif(X, Y)', T, Vs).
T = (p(_G925, _G926):-dif(_G925, _G926)),
Vs = ['X'=_G925, 'Y'=_G926].
In your case, you can simply ignore Vs:
?- atom_to_term('p(X, Y) :- dif(X, Y)', T, _).
T = (p(_G916, _G917):-dif(_G916, _G917)).