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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Convert-seconds-to-compound-duration/Prolog/convert-seconds-to-compound-duration.pro Normal file
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:- use_module(library(clpfd)).
% helper to perform the operation with just a number.
compound_time(N) :-
times(N, R),
format('~p: ', N),
write_times(R).
% write out the results in the 'special' format.
write_times([[Tt, Val]|T]) :-
dif(T, []),
format('~w ~w, ', [Val, Tt]),
write_times(T).
write_times([[Tt, Val]|[]]) :-
format('~w ~w~n', [Val, Tt]).
% this predicate is the main predicate, it takes either N
% or a list of split values to get N, or both.
times(N, R) :-
findall(T, time_type(T,_), TTs),
times(TTs, N, R).
% do the split, if there is a 1 or greater add to a list of results.
times([], _, []).
times([Tt|T], N, Rest) :-
time_type(Tt, Div),
Val #= N // Div,
Val #< 1,
times(T, N, Rest).
times([Tt|T], N, [[Tt,Val]|Rest]) :-
time_type(Tt, Div),
Val #= N // Div,
Val #>= 1,
Rem #= N mod Div,
times(T, Rem, Rest).
% specifify the different time split types
time_type(wk, 60 * 60 * 24 * 7).
time_type(d, 60 * 60 * 24).
time_type(hr, 60 * 60).
time_type(min, 60).
time_type(sec, 1).