--- /dev/null
+#include "group.h"
+#include "client.h"
+
+GHashTable *group_map = NULL;
+
+static guint map_hash(Window *w) { return *w; }
+static gboolean map_key_comp(Window *w1, Window *w2) { return *w1 == *w2; }
+
+void group_startup()
+{
+ group_map = g_hash_table_new((GHashFunc)map_hash,
+ (GEqualFunc)map_key_comp);
+}
+
+void group_shutdown()
+{
+ g_hash_table_destroy(group_map);
+}
+
+Group *group_add(Window leader, Client *client)
+{
+ Group *self;
+
+ self = g_hash_table_lookup(group_map, &leader);
+ if (self == NULL) {
+ self = g_new(Group, 1);
+ self->leader = leader;
+ self->members = NULL;
+ g_hash_table_insert(group_map, &self->leader, self);
+ g_message("NEW GROUP FOR %lx", leader);
+ } else
+ g_message("REUSING GROUP FOR %lx", leader);
+
+ self->members = g_slist_append(self->members, client);
+
+ return self;
+}
+
+void group_remove(Group *self, Client *client)
+{
+ self->members = g_slist_remove(self->members, client);
+ if (self->members == NULL) {
+ g_hash_table_remove(group_map, &self->leader);
+ g_free(self);
+ }
+}