Post your modding questions here

[Hybrid Dog]

l tried to find "legacy_mineral" (with grep -rl) in other files but it's only in ./games/minimal/mods/default/init.lua and ./games/minetest_game/mods/default/nodes.lua. Maybe it's used for decoration.

Hello Hybrd Dog,

Yes, I couldn't find it anywhere else either. Not a mention in lua_api.txt. I didn't know if it was maybe an outdated property, something like decoration as you said, or what. I don't seem to see it in the other mods I have either, so maybe it's something I can ignore like everyone else seems to be doing. xD That it doesn't do anything special I might want, maybe even just does nothing.

Just can't help but wonder though.

found it: viewtopic.php?p=46658#p46658
l need to remove it from my mod…

[Merlin]

Thanks for the great explanation 4aiman! :D
I will toy around with it a bit this weekend. I think I'll first do a simple mob similar to Minecrafts slime thingy.

[BrunoMine]

I know it sounds very simple, but I can not declare variables. Only constants.
example:

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local day = 1;

It does not change value even if I change its value in a function.

[Hybrid Dog]

It does not change value even if I change its value in a function.

Which function do you mean?

[BrunoMine]

Which function do you mean?

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local slot1_image = ""

function brazutec_instalar_em_laptop(texture)
   local slot1_imagem = textura
end

brazutec_laptop = {
   desktop = "size[12,9]"..
      "bgcolor[#080808BB;true]"..
      "image[0,0;15,10;brazutec_desktop.png]"..
      "image[0,0;5,5;"..slot1_imagem.."]",
}


in extra mod

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local new_image = "brazutec_botao_off.png"

minetest.register_on_joinplayer(function(player)
   brazutec_instalar_em_laptop(new_image)
end)


to sum up

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ERROR[main]:    
ERROR[main]: GUIFormSpecMenu::drawMenu() Draw images unable to load texture:


[Krock]

<snip>

Try this code:

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function get_laptop_formspec(texture)
   return (laptop_formspec.desktop..
      "image[0,0;5,5;"..texture.."]")
end

laptop_formspec = {
   desktop = "size[12,9]"..
      "bgcolor[#080808BB;true]"..
      "image[0,0;15,10;brazutec_desktop.png]"
}

---------------

local new_image = "brazutec_botao_off.png"

minetest.register_on_joinplayer(function(player)
   minetest.show_formspec(player:get_player_name(), "form:name", get_laptop_formspec(new_image))
end)


[lag01]

<snip>

Try this code:
<snip2>

Original brunob.santos's code seems crude, good idea to rewrite it.

[Hybrid Dog]

Which function do you mean?

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Code: Select all

local slot1_image = ""

function brazutec_instalar_em_laptop(texture)
   local slot1_imagem = textura
end

brazutec_laptop = {
   desktop = "size[12,9]"..
      "bgcolor[#080808BB;true]"..
      "image[0,0;15,10;brazutec_desktop.png]"..
      "image[0,0;5,5;"..slot1_imagem.."]",
}


You made some typos, l think (slot1_image and slot1_imagem, texture and textura).

If you write "local slot1_image = texture" in the function, slot1_image is only set to texture till "end", so slot1_image doesn't get changed, just remove the "local" in the function.

You need to change brazutec_laptop.desktop, too, because it's set to a string and slot1_image isn't linked. This would only work for tables, l think, e.g. "a={2,3} b=a b[1]=6 return a[1]==2"→false

[BrunoMine]

Thank you, problem solved.
Link to github repository.

now slotlivre button does not exhibit the formspec brazutec_laptop.slotlivre
https://github.com/BrunoMine/brazutec/blob/master/interface.lua

[BrunoMine]

Example:

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slot1_formspec = "example.form1"

minetest.register_on_player_receive_fields(function(player, meta, fields)
   if fields.button1 then
      minetest.show_formspec(player:get_player_name(), "", slot1_formspec)
   end
end


The problem
The minetest.show_formspec command takes slot1_formspec as a formspec and not as a variable.
as should be the syntax for recognition as a variable?

[BrunoMine]

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slot1_formspec = "example.form1"

function get_example_formspec(slot_formspec)
   return slot_formspec
end

minetest.register_on_player_receive_fields(function(player, meta, fields)
   if fields.button1 then
      minetest.show_formspec(player:get_player_name(), "", get_example_formspec(slot1_formspec))
   end
end


[false_chicken]

Is it possible to change an items description tool tip dynamically? For example a key. Crafted it may say "Blank Key" but after using it on a door it would change to "Key To: <name of door>". Thanks.

[Krock]

Is it possible to change an items description tool tip dynamically? For example a key. Crafted it may say "Blank Key" but after using it on a door it would change to "Key To: <name of door>". Thanks.

That's not possible. You must define multiple different keys.

[false_chicken]

Is it possible to change an items description tool tip dynamically? For example a key. Crafted it may say "Blank Key" but after using it on a door it would change to "Key To: <name of door>". Thanks.

That's not possible. You must define multiple different keys.

Ah I see. Thanks.

[false_chicken]

One more question. Can one disable an item from a base game/mod via lua? Like cleanly removing the Locked Chest from minetest_game or disabling the crafting recipe without editing the base game itself.

[Hybrid Dog]

One more question. Can one disable an item from a base game/mod via lua? Like cleanly removing the Locked Chest from minetest_game or disabling the crafting recipe without editing the base game itself.

you could write
default?
in depends.txt and
local craft = minetest.register_craft
function minetest.register_craft(a)
if a.output == "default:chest_locked" then
return
end
return craft(a)
end
in init.lua

[false_chicken]

One more question. Can one disable an item from a base game/mod via lua? Like cleanly removing the Locked Chest from minetest_game or disabling the crafting recipe without editing the base game itself.

you could write
default?
in depends.txt and
local craft = minetest.register_craft
function minetest.register_craft(a)
if a.output == "default:chest_locked" then
return
end
return craft(a)
end
in init.lua

Thanks! I'll give that a shot.

[false_chicken]

One more question. Can one disable an item from a base game/mod via lua? Like cleanly removing the Locked Chest from minetest_game or disabling the crafting recipe without editing the base game itself.

you could write
default?
in depends.txt and
local craft = minetest.register_craft
function minetest.register_craft(a)
if a.output == "default:chest_locked" then
return
end
return craft(a)
end
in init.lua

I am a bit confused now. Sorry! I tried it out but I was still able to craft the Locked Chest. The formatted code looks like this:

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Code: Select all

local craft = minetest.register_craft

function minetest.register_craft(a)
   if a.output == "default:chest_locked" then
      return
   end
   
   return craft(a)

end

I am unsure as to what this is actually supposed to do. I never call the function explicitly so I am not sure when it is actually supposed to run. From what I can see it never does.

[rubenwardy]

That won't work as the default mod declares the recipe before you add the check to stop it being declared.

You could try:

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minetest.registered_nodes["default:locked_chest_or_whatever"] = nil
minetest.registered_items["default:locked_chest_or_whatever"] = nil

[false_chicken]

That won't work as the default mod declares the recipe before you add the check to stop it being declared.

You could try:

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minetest.registered_nodes["default:locked_chest_or_whatever"] = nil
minetest.registered_items["default:locked_chest_or_whatever"] = nil

That did the trick! I can still craft it but when placed it simply disappears and does not exist in the creative menu. Thanks!

If anyone has any info on disabling the recipe as well that would be great but this is good enough.

[BrunoMine]

Starting a function 1 second after the start of server?
Example:

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minetest.chat_send_all("Server started!")


I know it's ridiculous, but tell me how to do this?

[false_chicken]

Starting a function 1 second after the start of server?
Example:

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Code: Select all

minetest.chat_send_all("Server started!")


I know it's ridiculous, but tell me how to do this?

I am not sure the proper way to do that. But what I would do just based on what little knowledge I have now would be to register a timed event with a global variable like "message_printed = false" then set it to true with a check in the event so it never runs again.

Simple example based on the wiki example:

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message_printed = false

local timer = 0
minetest.register_globalstep(function(dtime)
   
   if message_printed == false then
      timer = timer + dtime;
      if timer >= 10 and message_printed == false then
         -- Send "Server Started!" to all players after 10 seconds
         minetest.chat_send_all("Server Started!")
         timer = 0
         message_printed = true -- Set to true so it never prints again.
      end
   end
end)

http://dev.minetest.net/minetest.register_globalstep

[BrunoMine]

appears to be correct. thank you

[false_chicken]

How do you manually call a callback? I have modified on_place and have found that after_place_node never fires and the wiki says:

Rather than being used by the core game engine itself the following callbacks are called indirectly by the default implementations of the above primary callbacks, so installing a callback for the primary events may result in these methods not being called. For example, if you implement on_place with a custom event handler callback, then after_place_node will not be called unless you explicitly call it, since it is the default on_place callback (minetest.item_place) that calls after_place_node.

So how do I got about calling it myself? Thanks again!

[rubenwardy]

Starting a function 1 second after the start of server?
Example:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

minetest.chat_send_all("Server started!")


I know it's ridiculous, but tell me how to do this?

Use:

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minetest.after(1, function()
    minetest.chat_...
end)

Or something like that.

[false_chicken]

How do you use a library in the context of Minetest? I have created one and tried putting 'require "libname"' into into my init.lua but I get:

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10:53:00: ERROR[main]: ...jects/Repos/minetest/bin/../mods/modname/init.lua:35: module 'libname' not found:
10:53:00: ERROR[main]:    no field package.preload['libname']
10:53:00: ERROR[main]:    no file './libname.lua'
10:53:00: ERROR[main]:    no file '/usr/local/share/lua/5.1/libname.lua'
10:53:00: ERROR[main]:    no file '/usr/local/share/lua/5.1/libname/init.lua'
10:53:00: ERROR[main]:    no file '/usr/local/lib/lua/5.1/libname.lua'
10:53:00: ERROR[main]:    no file '/usr/local/lib/lua/5.1/libname/init.lua'
10:53:00: ERROR[main]:    no file '/home/user/ownCloud/Projects/Repos/minetest/bin/../mods/modname.lua'
10:53:00: ERROR[main]:    no file './libname.so'
10:53:00: ERROR[main]:    no file '/usr/local/lib/lua/5.1/libname.so'
10:53:00: ERROR[main]:    no file '/usr/local/lib/lua/5.1/libname.so'


It seems like it is not searching in my mods directory.

[Hybrid Dog]

@12Me21:

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minetest.register_on_craft(function(itemstack, _, old_craft_grid, craft_inv)
   if itemstack:get_name() == "default:chest_locked" then
      craft_inv:set_list("craft", old_craft_grid)
      itemstack:set_name("")
   end
end)

One more question. Can one disable an item from a base game/mod via lua? Like cleanly removing the Locked Chest from minetest_game or disabling the crafting recipe without editing the base game itself.

you could write
default?
in depends.txt and
local craft = minetest.register_craft
function minetest.register_craft(a)
if a.output == "default:chest_locked" then
return
end
return craft(a)
end
in init.lua

I am a bit confused now. Sorry! I tried it out but I was still able to craft the Locked Chest. The formatted code looks like this:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

local craft = minetest.register_craft

function minetest.register_craft(a)
   if a.output == "default:chest_locked" then
      return
   end
   
   return craft(a)

end

I am unsure as to what this is actually supposed to do. I never call the function explicitly so I am not sure when it is actually supposed to run. From what I can see it never does.

1. This code should override the function which registers a craft recipe to abort if the output is "default:chest_locked" before the default mod is loaded.
2. l'm sorry, l did a mistake, it would be default! and not default?
3. And l tried it but it still didn't work, maybe letting mods become loaded before default is impossible…

But l found another solution:
minetest.register_on_craft(function(itemstack, _, old_craft_grid, craft_inv)
if itemstack:get_name() == "default:chest_locked" then
craft_inv:set_list("craft", old_craft_grid)
itemstack:set_name("")
end
end)
The locked chest appears but if you click on it, nothing happens. G:
lf you want, l can disable showing it.

[TeTpaAka]

I think, writing something into depends.txt forces the Engine to load the mod before yours, so your code would be executed after default registered the items.

[Hybrid Dog]

I think, writing something into depends.txt forces the Engine to load the mod before yours, so your code would be executed after default registered the items.

but if you add a ! after the modname, your mod is loaded after this one l think

[TeTpaAka]

but if you add a ! after the modname, your mod is loaded after this one l think

Well, you're right. According to the dev-wiki, this is true. But it doesn't seem to work. I made a quick test and it seems minetest simply ignores the ! and treats it like it was missing.