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https://github.com/LanternMC/load


https://github.com/LanternMC/load

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= Lantern Load

:aestd: https://github.com/Aeldrion/AESTD[AESTD]

:gm4: https://github.com/Gamemode4Dev/GM4_Datapacks[Gamemode 4]

:playerdb: https://github.com/rx-modules/PlayerDB[PlayerDB]

:old-version: https://github.com/LanternMC/load/tree/1.16[older version of Lantern Load]

:0bsd-license: link:LICENSE[BSD 0-Clause License]



Lantern Load provides a simple implementation of version resolution intended to allow data packs and their dependencies to load in a controllable order.

Projects that depend on this library include {aestd}, {gm4}, and {playerdb}.



This project is released under the {0bsd-license}, which in short means you can do whatever you want with these files, with nothing expected in return. You do not even have to credit us.



WARNING: *This pack is for Minecraft 1.17 or higher.*

This version of Lantern Load will not work correctly in 1.16 and will not even load in versions prior to 1.16.

If you must release a pack for 1.16, please use an {old-version}.



== Usage



1. Copy the `load` and `minecraft` directories from `load/data/` into your pack's `data` folder. The copied in `load.json` should now call `#load:_private/load`.



2. Add load functions in the desired load order to `data/load/tags/functions/load.json` or the other tags `pre_load.json` and  `post_load.json`. For most cases you should prefer `load.json`.



.Example `load.json` contents:

[source,json]

----

{

    "values": [

        "pack1:load",

        "your_pack:load"

    ]

}

----



=== Pack Versioning Specification



The recommended (but not mandatory) use of the `load.status` scoreboard:



____

Each pack *should* define at least one fake player whose name includes the name of the pack.

At least one of these fake players *should* have a value that *should not* be decreased in future updates to the pack.

This score value *may* be defined to remain constant, or increment in future updates to the pack with or without a semantic meaning.

____



This specification is intentionally open-ended as it is not this project's goal to force a specific versioning scheme on every data pack.

Following the specification simply implies that one can detect when your pack is loaded by checking your `load.status` score.



=== Avoiding the `#minecraft:tick` tag



The `#minecraft:tick` tag has several problems, the worst of which is that it runs _before_ `#minecraft:load`, meaning that your pack may be ticked without first being initialized.

Lantern Load is meant to allow every pack to initialize itself in a predictable order within the same tick, including on reload, and `#minecraft:tick` interferes with this design goal.

The recommended solution is to instead invoke `schedule` from a function defined in `#load:load`.



.Example contents of load and tick functions:

[source,mcfunction]

----

# your_pack:load

scoreboard players set your_pack load.status 1

schedule function your_pack:tick 1t



# your_pack:tick

say this is a tick!

schedule function your_pack:tick 1t

----



=== Checking for dependencies



In your load function, you may wish to check the value of another pack's score in `load.status` before initializing scoreboards or scheduling your tick function.

Doing so is a useful way to handle missing dependencies and reduce the risk of your data pack causing errors.



.Example of checking the value of another pack's load status:

[source,mcfunction]

----

# your_pack:load

schedule clear your_pack:tick

execute if score other_pack load.status matches 1 run scoreboard players set your_pack load.status 1

execute if score your_pack load.status matches 1 run function your_pack:init



# your_pack:init

scoreboard objectives add your_objective dummy

schedule function your_pack:tick 1t



# your_pack:tick

scoreboard players add your_score your_objective 1

schedule function your_pack:tick 1t

----



== License



Lantern Load is made freely available under the terms of the {0bsd-license}.

Third-party contributions shall be licensed under the same terms unless explicitly stated otherwise.