[0.18.4] script.active_mods contains mods during mod initialization which have been disabled when loading a save

[jan1i3]

TL;DR

When loading a save which had a mod enabled, which is now disabled, it will still be in script.active_mods during mod initialization.

Expected

script.active_mods should always only have mods in it which are currently active.

Example

save_info.png (43.84 KiB) Viewed 3459 times

error.png (27.7 KiB) Viewed 3459 times

ScriptActiveModsIssue/control.lua:

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if script.active_mods["ScriptActiveModsIssueDummy"] then
  require("__ScriptActiveModsIssueDummy__/empty.lua") -- this is line 3
end

Reproduce

1. Only have the mod ScriptActiveModsIssue enabled
2. Load the provided save

Or, for full reproduction:

1. Have both provided mods enabled
2. Create a new world
3. Save it
4. Disable the mod ScriptActiveModsIssueDummy
5. Load the previously saved game

Workaround

keep using pcall require, which script.active_mods was supposed to replace

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pcall(require, "__ScriptActiveModsIssueDummy__/empty.lua")

[Honktown]

Bug doesn't occur in 0.17.79.

A side note, is that for a new game [in 17.79], script.active_mods doesn't exist, so I had to do an if pcall() and... to get it to go.

Edit wait, this is strange. The pcall returns true when I do
Nevermind I get false. Even when loading a normal game there is no script.active_mods, it only exists while the game is running and in the game table

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pcall(function() return script.active_mods end)

but then if I remove the pcall I get

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"Error AppManagerStates.cpp:1443: LuaBootstrap doesn't contain key active_mods."

[Honktown]

Related topics:

see the last post:
viewtopic.php?t=52040

https://stackoverflow.com/questions/444 ... ies-in-lua

https://github.com/mexmer/ScienceCostTweakerM/issues/28

Instead they state that all require calls should be top level so they are always require'd regardless, and instead conditional tests should be put into the file itself or the calls to things inside the files.

The interpreter probably hits the require and ignores that it's in a conditional. Other people have seemed to have issues with conditional requires (probably because of run-time issues like if a library was required by the time a function is called, which would mess up things which pre-compile/interpret syntax).

[jan1i3]

I don't exactly see how what you've said/posted is related.

The issue is specific to script.active_mods.

Before 0.18 to do conditional requires in the control stage you had to pcall require.
With 0.18 came script.active_mods with the purpose of no longer needing pcall, and having the version numbers available during mod initialization.
(As I hinted at in the Workaround section)
Note that this was an issue since the very start, I just didn't report it until now.

I feel like you misunderstood, which is fine

[Honktown]

I don't exactly see how what you've said/posted is related.

The issue is specific to script.active_mods.

Before 0.18 to do conditional requires in the control stage you had to pcall require.
With 0.18 came script.active_mods with the purpose of no longer needing pcall, and having the version numbers available during mod initialization.
(As I hinted at in the Workaround section)
Note that this was an issue since the very start, I just didn't report it until now.

I feel like you misunderstood, which is fine

I wanted to see if I could reproduce it, and I'm on 0.17.79. script.active_mods doesn't even exist, unless I'm doing something so stupidly obvious I'm missing it. Although it's under https://lua-api.factorio.com/latest/LuaBootstrap.html , it only exists in "game"

P.s. if Factorio features conditional requires that's unique. It looks like other implementations have issues with it.

[jan1i3]

Oh I see - yea if you want to reproduce it, you'll have to be in 0.18
The "latest" api is 0.18.4 (currently), so script.active_mods is there
see the 0.17.79 api where it isn't

[Honktown]

Oh I see - yea if you want to reproduce it, you'll have to be in 0.18
The "latest" api is 0.18.4 (currently), so script.active_mods is there
see the 0.17.79 api where it isn't

Ah, thank you. I assumed "latest" was the latest stable.

[Rseding91]

Thanks for the report and for the save file + mod to reproduce the issue. It's now fixed for the next release.

[jan1i3]

Thank you for fixing it