+static void shift_win_forward(struct WinMeta * wmeta)
+{
+ if (wmeta->active == wmeta->chain_end)
+ {
+ wmeta->chain_end = wmeta->active->prev;
+ wmeta->chain_end->next = 0;
+ wmeta->active->next = wmeta->chain_start;
+ wmeta->active->next->prev = wmeta->active;
+ wmeta->chain_start = wmeta->active;
+ wmeta->chain_start->prev = 0;
+ }
+ else
+ {
+ struct Win * old_prev = wmeta->active->prev;
+ struct Win * old_next = wmeta->active->next;
+ if (wmeta->chain_end == wmeta->active->next)
+ {
+ wmeta->chain_end = wmeta->active;
+ wmeta->active->next = 0;
+ }
+ else
+ {
+ wmeta->active->next = old_next->next;
+ wmeta->active->next->prev = wmeta->active;
+ }
+ if (wmeta->chain_start == wmeta->active)
+ {
+ wmeta->chain_start = old_next;
+ }
+ else
+ {
+ old_prev->next = old_next;
+ }
+ old_next->prev = old_prev;
+ old_next->next = wmeta->active;
+ wmeta->active->prev = old_next;
+ }
+}
+
+
+
+static void shift_win_backward(struct WinMeta * wmeta)
+{
+ if (wmeta->active == wmeta->chain_start)
+ {
+ wmeta->chain_start = wmeta->active->next;
+ wmeta->chain_start->prev = 0;
+ wmeta->active->prev = wmeta->chain_end;
+ wmeta->active->prev->next = wmeta->active;
+ wmeta->chain_end = wmeta->active;
+ wmeta->chain_end->next = 0;
+ }
+ else
+ {
+ struct Win * old_prev = wmeta->active->prev;
+ struct Win * old_next = wmeta->active->next;
+ if (wmeta->chain_start == wmeta->active->prev)
+ {
+ wmeta->chain_start = wmeta->active;
+ wmeta->active->prev = 0;
+ }
+ else
+ {
+ wmeta->active->prev = old_prev->prev;
+ wmeta->active->prev->next = wmeta->active;
+ }
+ if (wmeta->chain_end == wmeta->active)
+ {
+ wmeta->chain_end = old_prev;
+ }
+ else
+ {
+ old_next->prev = old_prev;
+ }
+ old_prev->next = old_next;
+ old_prev->prev = wmeta->active;
+ wmeta->active->next = old_prev;
+ }
+}
+
+
+