Replace function in prefab

[Schulliya]

Hi. I want to change Chester's items to morph into fridge Chester.

I don't understand exactly how does AddPrefabPostInit works. I know it can add new things to the prefab, but how can I modify something that's already there?

Thanks!

[Bumber64]

You mean modifying the function CanMorph? If you don't want to replace the entire prefabs/chester.lua, then you'll have to use upvalue hacking.

You can reach CanMorph through inst.MorphChester. Rezecib's upvalue hacker is here. Put that in your mod's scripts/tools, then you can do:

local UpvalueHacker = require("tools/upvaluehacker")

local function yourCanMorphFunction(inst)
    --your modified version of CanMorph
end

AddPrefabPostInit("chester", function(inst)
    if inst.MorphChester then --this is set to nil in DoMorph
        UpvalueHacker.SetUpvalue(inst.MorphChester, yourCanMorphFunction, "CanMorph")
    end
end)

You can name your custom function "CanMorph" instead of "yourCanMorphFunction". I just named it that for clarity.

Edited June 27, 2022 by Bumber64

[Schulliya]

16 hours ago, Bumber64 said:

You mean modifying the function CanMorph? If you don't want to replace the entire prefabs/chester.lua, then you'll have to use upvalue hacking.

You can reach CanMorph through inst.MorphChester. Rezecib's upvalue hacker is here. Put that in your mod's scripts/tools, then you can do:

local UpvalueHacker = require("tools/upvaluehacker")

local function yourCanMorphFunction(inst)
    --your modified version of CanMorph
end

AddPrefabPostInit("chester", function(inst)
    if inst.MorphChester then --this is set to nil in DoMorph
        UpvalueHacker.SetUpvalue(inst.MorphChester, yourCanMorphFunction, "CanMorph")
    end
end)

You can name your custom function "CanMorph" instead of "yourCanMorphFunction". I just named it that for clarity.

thank you!

[GrowthMindset]

19 hours ago, Bumber64 said:

You mean modifying the function CanMorph? If you don't want to replace the entire prefabs/chester.lua, then you'll have to use upvalue hacking.

You can reach CanMorph through inst.MorphChester. Rezecib's upvalue hacker is here. Put that in your mod's scripts/tools, then you can do:

local UpvalueHacker = require("tools/upvaluehacker")

local function yourCanMorphFunction(inst)
    --your modified version of CanMorph
end

AddPrefabPostInit("chester", function(inst)
    if inst.MorphChester then --this is set to nil in DoMorph
        UpvalueHacker.SetUpvalue(inst.MorphChester, yourCanMorphFunction, "CanMorph")
    end
end)

You can name your custom function "CanMorph" instead of "yourCanMorphFunction". I just named it that for clarity.

This made my game stuck at "Launching server..." and lagged my PC so much
Repeated it 3 times... Removing this code form from my mod gets it back to normal... Any ideas?

The logs file went up to 1+ GB. No kidding.

I really wanna make upvalue hacker work. Even though I'm not sure how exactly I can modify local functions with it in prefab files (without replacing them)

Edited June 27, 2022 by GrowthMindset