integrate `bg_api_event` into `bg_api`.

mods/bg_api/event.lua

@@ -1,4 +1,3 @@
---[[
 local modname = minetest.get_current_modname()
 
 blockgame.events = blockgame.events or {}
@@ -13,28 +12,29 @@ function api.namespace (name)
 	namespaces[name] = {
 		listen = function (...) return api.listen(name, ...) end,
 		broadcast = function (...) return api.broadcast(name, ...) end,
+		listeners = {},
 	}
 	return namespaces[name]
 end
 
 function api.listen (namespace_name, event, callback)
-	local namespace = namespaces[namespace_name]
-	if not namespace then return false end
+	local listeners = api.namespace(namespace_name).listeners
+	listeners[event] = listeners[event] or {}
 
-	namespace[event] = namespace[event] or {}
-	table.insert(namespace[event], {
+	table.insert(listeners[event], {
 		event = event,
 		callback = callback,
 	})
-	return #namespace[event]
+	return #listeners[event]
 end
 
 function api.broadcast (namespace_name, event, data)
-	local namespace = namespaces[namespace_name]
-	if not namespace then return false end
+	if not namespaces[namespace_name] then return end
 
-	for _, listener in pairs(namespace[event]) do
+	local listeners = api.namespace(namespace_name).listeners
+	if not listeners[event] then return end
+
+	for _, listener in pairs(listeners[event]) do
 		listener.callback(data, event)
 	end
 end
-]]--

mods/bg_api/init.lua

@@ -6,6 +6,8 @@ rawset(_G, "load_file", load_file)
 local blockgame = {}
 rawset(_G, "blockgame", blockgame)
 
+load_file("event")
+
 load_file("util_table")
 load_file("util_string")
 load_file("util_debug")

mods/bg_api_event/mod.conf

@@ -1,3 +0,0 @@
-name = bg_api_event
-description = events api for blockgame.
-depends = bg_api