shiftview.c

/** Function to shift the current view to the left/right
 *
 * @param: "arg->i" stores the number of tags to shift right (positive value)
 *          or left (negative value)
 */
void shiftview(const Arg *arg)
{
    Arg shifted;
    Client *c;
    unsigned int tagmask = 0;

    for (c = selmon->clients; c; c = c->next)
        if (!(c->tags & SPTAGMASK))
            tagmask = tagmask | c->tags;

    shifted.ui = selmon->tagset[selmon->seltags] & ~SPTAGMASK;
    if (arg->i > 0) /* left circular shift */
        do
        {
            shifted.ui = (shifted.ui << arg->i) | (shifted.ui >> (LENGTH(tags) - arg->i));
            shifted.ui &= ~SPTAGMASK;
        } while (tagmask && !(shifted.ui & tagmask));
    else /* right circular shift */
        do
        {
            shifted.ui = (shifted.ui >> (-arg->i) | shifted.ui << (LENGTH(tags) + arg->i));
            shifted.ui &= ~SPTAGMASK;
        } while (tagmask && !(shifted.ui & tagmask));

    view(&shifted);
}

void shifttag(const Arg *arg)
{
    Arg a;
    Client *c;
    unsigned visible = 0;
    int i = arg->i;
    int count = 0;
    int nextseltags, curseltags = selmon->tagset[selmon->seltags];

    do
    {
        if (i > 0) // left circular shift
            nextseltags = (curseltags << i) | (curseltags >> (LENGTH(tags) - i));

        else // right circular shift
            nextseltags = (curseltags >> -i) | (curseltags << (LENGTH(tags) + i));

        // Check if tag is visible
        for (c = selmon->clients; c && !visible; c = c->next)
            if (nextseltags & c->tags)
            {
                visible = 1;
                break;
            }
        i += arg->i;
    } while (!visible && ++count < 10);

    if (count < 10)
    {
        a.i = nextseltags;
        tag(&a);
    }
}