+void add_rule(rule_t *r)
+{
+ if (rule_head == NULL) {
+ rule_head = rule_tail = r;
+ } else {
+ rule_tail->next = r;
+ r->prev = rule_tail;
+ rule_tail = r;
+ }
+}
+
+void remove_rule(rule_t *r)
+{
+ if (r == NULL)
+ return;
+ rule_t *prev = r->prev;
+ rule_t *next = r->next;
+ if (prev != NULL)
+ prev->next = next;
+ if (next != NULL)
+ next->prev = prev;
+ if (r == rule_head)
+ rule_head = next;
+ if (r == rule_tail)
+ rule_tail = prev;
+ free(r);
+}
+
+void remove_rule_by_uid(unsigned int uid)
+{
+ remove_rule(find_rule(uid));
+}
+
+void prune_rules(desktop_t *d)
+{
+ rule_t *r = rule_head;
+ while (r != NULL) {
+ rule_t *next = r->next;
+ if (r->effect.desktop == d)
+ remove_rule(r);
+ r = next;
+ }
+}
+
+rule_t *find_rule(unsigned int uid)
+{
+ for (rule_t *r = rule_head; r != NULL; r = r->next)
+ if (r->uid == uid)
+ return r;
+ return NULL;
+}
+