Client *
prevtiled(Client *c) {
        for(; c && (c->isfloating || !isvisible(c)); c = c->prev);
        return c;
}

void
pushup(const char *arg) {
        Client *c;

        if(!sel || !dozoom || sel->isfloating)
                return;
        if((c = prevtiled(sel->prev))) {
                /* attach before c */
                detach(sel);
                sel->next = c;
                sel->prev = c->prev;
                c->prev = sel;
                if(sel->prev)
                        sel->prev->next = sel;
                else
                        clients = sel;
        } else {
                /* move to the end */
                for(c = sel; c->next; c = c->next);
                detach(sel);
                sel->prev = c;
                c->next = sel;
        }
        focus(sel);
        arrange();
}

void
pushdown(const char *arg) {
        Client *c;

        if(!sel || !dozoom || sel->isfloating)
                return;
        if((c = nexttiled(sel->next))) {
                /* attach after c */
                detach(sel);
                sel->prev = c;
                sel->next = c->next;
                c->next = sel;
                if(sel->next)
                        sel->next->prev = sel;
        } else {
                /* move to the front */
                detach(sel);
                attach(sel);
        }
        focus(sel);
        arrange();
}