How do I check if minetest node/item is registered (exists)?

[drkwv]

Hello. I need something like this:

Code: Select all

if minetest.item_is_registered("default:cobble") then
  minetest.override_item("default:cobble", ...)
end

How do I test if item is registered?

[TalkLounge]

Code: Select all

if minetest.registered_nodes["default:dirt"] then
 --exists
end

They are all saved here

core is the same as minetest. So core.registered_items would work as well as an example.

[drkwv]

Thank you!

[Krock]

To ensure this code always works as expected, depend your mod on "default". This ensures that the nodes are registered before your mod is loaded. However, that does not matter as soon you're checking the node presence from a callback because then all nodes will already be registered.

[ThorfinnS]

To ensure this code always works as expected, depend your mod on "default". This ensures that the nodes are registered before your mod is loaded. However, that does not matter as soon you're checking the node presence from a callback because then all nodes will already be registered.

Just so I'm sure I'm understanding how it works, an optional depend ("default?") is sufficient for this, right? It's what I've been doing, and haven't run into anything yet, but maybe that's just dumb luck..

[TalkLounge]

If your init.lua would be

Code: Select all

if minetest.registered_nodes["default:dirt"] then
 --exists
end

then it can happen, that your mod, with this source code in it will be loaded before the default mod and then the if statement would be false. Optional dependency would be the best here, because if there's a default mod, then it will be loaded before your mod, but if there's no default mod, your mod will run as well.

But if you do something like this in your init.lua

Code: Select all

minetest.register_on_joinplayer(function(player)
  if minetest.registered_nodes["default:dirt"] then
   --exists
  end
end)

then you don't need to set default as optional dependency, because all mods will be loaded, before this callback will be called.

[GreenXenith]

But if you do something like this in your init.lua

Code: Select all

minetest.register_on_joinplayer(function(player)
  if minetest.registered_nodes["default:dirt"] then
   --exists
  end
end)

then you don't need to set default as optional dependency, because all mods will be loaded, before this callback will be called.

This wont work for overriding.
Use

Code: Select all

minetest.register_on_mods_loaded(function()
    if minetest.registered_nodes["default:cobble"] then
        minetest.override_item("default:cobble", {})
    end
end)

[TalkLounge]

Ohh, yeah, sure. Just want to show the system of dependencies. But overriding won't work then. Misleading example. So use optional dependencies here.

If you are using minetest.register_on_mods_loaded, your mod is only for minetest 5.0.0+. Won't run in 0.4.x then.