/*
 *  SPL - The SPL Programming Language
 *  Copyright (C) 2004, 2005  Clifford Wolf <clifford@clifford.at>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  hanoi.spl: Playing towers of hanoi in an endless loop
 */

load "termio";

var stacks;

for (var i=10; i>0; i--)
	push stacks[0], i;

function draw() {
	termio_clear();
	for (var s=0; s<3; s++) {
		var line = 0;
		foreach i (stacks[s]) {
			termio_setpos(s * 25 + 5, 15 - line++);
			for (var j=stacks[s][i]; j<10; j++) write(" ");
			for (var j=0; j<stacks[s][i]*2; j++) write("*");
		}
		termio_setpos(s * 25 + 3, 16);
		for (var j=0; j<24; j++) write("=");
	}
	termio_setpos(1, 1);
}

function hanoi(from, to, temp, num) {
	if (num) hanoi(from, temp, to, num-1);

	push stacks[to], pop stacks[from];

	draw();
	termio_sleep();

	if (num) hanoi(temp, to, from, num-1);
}

while (1) {
	hanoi(0, 2, 1, 9);
	hanoi(2, 1, 0, 9);
	hanoi(1, 0, 2, 9);
}