shiftview.c


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/** 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);
  }
}