dwm/patch/inplacerotate.c

void
insertclient(Client *item, Client *insertItem, int after)
{
	Client *c;
	if (item == NULL || insertItem == NULL || item == insertItem) return;
	detach(insertItem);
	if (!after && selmon->clients == item) {
		attach(insertItem);
		return;
	}
	if (after) {
		c = item;
	} else {
		for (c = selmon->clients; c; c = c->next) { if (c->next == item) break; }
	}
	insertItem->next = c->next;
	c->next = insertItem;
}

void
inplacerotate(const Arg *arg)
{
	if (!selmon->sel || (selmon->sel->isfloating && !arg->f)) return;

	unsigned int selidx = 0, i = 0;
	Client *c = NULL, *stail = NULL, *mhead = NULL, *mtail = NULL, *shead = NULL;

	// Shift client
	for (c = selmon->clients; c; c = c->next) {
		if (ISVISIBLE(c) && !(c->isfloating)) {
			if (selmon->sel == c) { selidx = i; }
			if (i == selmon->nmaster - 1) { mtail = c; }
			if (i == selmon->nmaster) { shead = c; }
			if (mhead == NULL) { mhead = c; }
			stail = c;
			i++;
		}
	}
	if (arg->i < 0 && selidx >= selmon->nmaster) insertclient(stail, shead, 1);
	if (arg->i > 0 && selidx >= selmon->nmaster) insertclient(shead, stail, 0);
	if (arg->i < 0 && selidx < selmon->nmaster)  insertclient(mtail, mhead, 1);
	if (arg->i > 0 && selidx < selmon->nmaster)  insertclient(mhead, mtail, 0);

	// Restore focus position
	i = 0;
	for (c = selmon->clients; c; c = c->next) {
		if (!ISVISIBLE(c) || (c->isfloating)) continue;
		if (i == selidx) { focus(c); break; }
		i++;
	}
	arrange(selmon);
	focus(c);
}