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Task/CSV-data-manipulation/Prolog/csv-data-manipulation.pro

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+test :- augment('test.csv', 'test.out.csv').
+
+% augment( +InFileName, +OutFileName)
+augment(InFile, OutFile)  :-
+	open(OutFile, write, OutStream),
+	( ( csv_read_file_row(InFile, Row, [line(Line)]),
+	    % Row is of the form row( Item1, Item2, ....).
+	    addrow(Row, Out),
+	    csv_write_stream(OutStream, [Out], []),
+	    fail
+	  )
+	; close(OutStream)
+	).
+
+% If the first item in a row is an integer, then append the sum;
+% otherwise append 'SUM':
+addrow( Term, NewTerm ) :-
+	Term =.. [F | List],
+	List = [X|_],
+	(integer(X) -> sum_list(List, Sum) ; Sum = 'SUM'),
+	append(List, [Sum], NewList),
+	NewTerm =.. [F | NewList].