libfic: new function to retrieve exercices from a hint

libfic/hint.go

@@ -84,3 +84,12 @@ func (h EHint) Delete() (int64, error) {
 		return nb, err
 	}
 }
+
+func (h EHint) GetExercice() (Exercice, error) {
+	var eid int64
+	if err := DBQueryRow("SELECT id_exercice FROM exercice_hints WHERE id_hint = ?", h.Id).Scan(&eid); err != nil {
+		return Exercice{}, err
+	}
+
+	return GetExercice(eid)
+}