!7

static L<S> data;
static JList list;

p-subst {
  autoRestart();
  L<S> lines = trimAll(lines(mechList_raw("heise.de 2018/04/20 (raw)")));
  data = notEndingWith(".", filter containsSpace(standAloneLines(lines));
  makeList();
  
  L<S> ops = mechLists_intersect("Operations on lists", "Safe JavaX functions");
  
  addToWindowWithMargin(list, jcenteredLine(map(ops, func(fS op) -> JButton {
    jbutton(op, r-messagebox { performOp(op); })
  })));
}

svoid performOp(S op) {
  O newData = callAndMake(op, data);
  if (isStringList(newData))
    data = (L<S>) newData;
  else
    data = lines(str(newData));
  makeList();
}

svoid makeList {
  list = showList(list, data);
  titleStatus(list, l(data));
}