Cube  Diff

	if (selset) {
		linestyle(GRIDS, 0xFF, 0x40, 0x40);
		box(sel, (float)selh, (float)selh, (float)selh, (float)selh);
	}
}

vector<block *> undos;    // unlimited undo
VARP(undomegs, 0, 1, 10); // bounded by n megs
static OFMutableData *undos; // unlimited undo
VARP(undomegs, 0, 1, 10);    // bounded by n megs

void
pruneundos(int maxremain) // bound memory
{
	int t = 0;
	for (ssize_t i = (ssize_t)undos.count - 1; i >= 0; i--) {
	loopvrev(undos)
	{
		t += undos[i]->xs * undos[i]->ys * sizeof(sqr);
		if (t > maxremain)
			OFFreeMemory(undos.remove(i));
		block *undo = *(block **)[undos itemAtIndex:i];

		t += undo->xs * undo->ys * sizeof(sqr);
		if (t > maxremain) {
			OFFreeMemory(undo);
			[undos removeItemAtIndex:i];
		}
	}
}

void
makeundo()
{
	if (undos == nil)
		undos =
		    [[OFMutableData alloc] initWithItemSize:sizeof(block *)];

	undos.add(blockcopy(sel));
	block *copy = blockcopy(sel);
	[undos addItem:&copy];
	pruneundos(undomegs << 20);
}

void
editundo()
{
	EDITMP;
	if (undos.empty()) {
	if (undos.count == 0) {
		conoutf(@"nothing more to undo");
		return;
	}
	block *p = undos.pop();
	block *p = *(block **)undos.lastItem;
	[undos removeLastItem];
	blockpaste(*p);
	OFFreeMemory(p);
}

block *copybuf = NULL;

void