Add copper, and the beginnings of a machine system.

mods/rgt_base/init.lua

@@ -36,8 +36,39 @@ function say(msg)
     minetest.chat_send_all("# Server: "..msg)
 end
 
+EventTarget = {
+    init = function()
+        local e = {
+            listeners = {}
+        }
+        return setmetatable(e, {__index = EventTarget})
+    end,
+    listen = function(e, channel, fn)
+        if not e.listeners[channel] then e.listeners[channel] = {} end
+        local l = e.listeners[channel]
+        l[#l +1] = fn
+    end,
+    unlisten = function(e, channel, fn)
+        if not e.listeners[channel] then return end
+        local l = e.listeners[channel]
+        local idx = table.indexof(l, fn)
+        if idx < 0 then return end
+        table.remove(l, idx)
+    end,
+    dispatch = function(e, channel, ...)
+        local l = e.listeners[channel]
+        if not l then return end
+        for i = 1, #l do
+            l[i](...)
+        end
+    end
+}
+setmetatable(EventTarget, {
+    __call = function(_, ...) return EventTarget.init(...) end
+})
+
 rgt = {
-    horizontal_neighbor_offests = {
+    adjacent_neighbor_offests = {
         vector.new(0,0,1),
         vector.new(0,0,-1),
         vector.new(1,0,0),
@@ -52,7 +83,9 @@ rgt = {
         vector.new(0,0,-1),
         vector.new(1,0,0),
         vector.new(-1,0,0),
-    }
+    },
+    nodes_to_content_ids = {},
+    content_ids_to_nodes = {}
 }
 local ns = rgt
 
@@ -80,6 +113,9 @@ function ns.register_node(name, def)
         end
     end
     minetest.register_node(":"..name, def)
+    local cid = minetest.get_content_id(name)
+    ns.nodes_to_content_ids[name] = cid
+    ns.content_ids_to_nodes[cid] = name
     if alias then
         minetest.register_alias(alias, name)
     end
@@ -111,6 +147,26 @@ function ns.register_tool(name, def)
     end
 end
 
+function ns.register_entity(name, def)
+    minetest.register_entity(name, def)
+end
+
+-- Out-of-line node metadata, allowing meta for a node to be accessed even when its containing mapblock is not loaded.
+local db = minetest.get_mod_storage()
+local NodeMetaRef = {
+    set = function(e, key, value)
+        return db:set_string(e._pos.."_"..key, value)
+    end,
+    get = function(e, key)
+        return db:get(e._pos.."_"..key)
+    end,
+}
+NodeMetaRef.__index = NodeMetaRef
+
+function ns.get_node_meta(pos)
+    return setmetatable({_pos = tostring(minetest.hash_node_position(pos))}, NodeMetaRef)
+end
+
 -- Allow nodes to provide a callback to run on activation without
 -- needing to register a bunch of mostly identical LBMs.
 minetest.register_lbm {