registered item list with unknown node marker

handlers/items.lua

@@ -0,0 +1,3 @@
+mtui.register_on_command("get_item_list", function()
+	return mtui.items
+end)

init.lua

@@ -6,8 +6,11 @@ end
 
 print("[mtui] initializing")
 mtui = {
+    mod_storage = minetest.get_mod_storage(),
     url = minetest.settings:get("mtui.url") or "http://127.0.0.1:8080",
-    key = minetest.settings:get("mtui.key")
+    key = minetest.settings:get("mtui.key"),
+    -- map of name to bool (known node)
+    items = {}
 }
 assert(mtui.key, "no key found")
 
@@ -18,6 +21,7 @@ loadfile(MP.."/bridge_tx.lua")(http)
 dofile(MP.."/common.lua")
 dofile(MP.."/tan.lua")
 dofile(MP.."/stats.lua")
+dofile(MP.."/items.lua")
 dofile(MP.."/log.lua")
 dofile(MP.."/log_file.lua")
 dofile(MP.."/log_technic.lua")
@@ -27,6 +31,7 @@ dofile(MP.."/controls/builtin.lua")
 dofile(MP.."/controls/restart_if_empty.lua")
 
 dofile(MP.."/handlers/ping.lua")
+dofile(MP.."/handlers/items.lua")
 dofile(MP.."/handlers/chat.lua")
 dofile(MP.."/handlers/execute_command.lua")
 dofile(MP.."/handlers/lua.lua")
@@ -61,6 +66,7 @@ end
 if minetest.get_modpath("mtt") and mtt.enabled then
     dofile(MP.."/mtt.lua")
     dofile(MP.."/common.spec.lua")
+    dofile(MP.."/items.spec.lua")
 end
 
 if minetest.get_modpath("monitoring") then

items.lua

@@ -0,0 +1,42 @@
+
+local function check_registered_items()
+    mtui.items = minetest.deserialize(mtui.mod_storage:get_string("registered_items")) or {}
+
+    -- assemble node-list from registered lbm's
+    local lbm_nodes = {}
+    for _, lbm in ipairs(minetest.registered_lbms) do
+        if type(lbm.nodenames) == "string" then
+            -- duh, list as string
+            lbm_nodes[lbm.nodenames] = true
+        else
+            -- proper list, add all regardless if they are a "group:*"
+            for _, nodename in ipairs(lbm.nodenames) do
+                lbm_nodes[nodename] = true
+            end
+        end
+    end
+
+    -- mark all currently registered items
+    for name in pairs(minetest.registered_items) do
+        mtui.items[name] = true
+    end
+
+    -- check for items that don't exist anymore
+    for name in pairs(mtui.items) do
+        if not minetest.registered_items[name] and
+            not minetest.registered_aliases[name] and
+            not lbm_nodes[name] then
+            -- item does not exist anymore, mark it as such
+            mtui.items[name] = false
+        end
+    end
+
+    -- save current list back
+    mtui.mod_storage:set_string("registered_items", minetest.serialize(mtui.items))
+end
+
+-- execute check after mods loaded and other things are set up
+minetest.register_on_mods_loaded(function()
+    minetest.after(0, check_registered_items)
+end)
+

items.spec.lua

@@ -0,0 +1,12 @@
+
+mtt.register("items", function(callback)
+    assert(mtui.items)
+
+    local count = 0
+    for _ in pairs(mtui.items) do
+        count = count + 1
+    end
+
+    assert(count > 0)
+    callback()
+end)