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Add an "Incompatibilities between versions" page

This is largely based on our existing wiki page. I've pruned out a
couple of entries which I think are largely irrelevant (config file
splitting, Java API changes).

10/10 job by me of changing nothing since 1.13. Shame to break that
streak really.
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Jonathan Coates 2023-10-28 20:00:09 +01:00
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---
module: [kind=reference] breaking_changes
---
<!--
SPDX-FileCopyrightText: 2019 The CC: Tweaked Developers
SPDX-License-Identifier: MPL-2.0
-->
# Incompatibilities between versions
CC: Tweaked tries to remain as compatible between versions as possible, meaning most programs written for older version
of the mod should run fine on later versions.
> [External peripherals][!WARNING]
>
> While CC: Tweaked is relatively stable across versions, this may not be true for other mods which add their own
> peripherals. Older programs which interact with external blocks may not work on newer versions of the game.
However, some changes to the underlying game, or CC: Tweaked's own internals may break some programs. This page serves
as documentation for breaking changes and "gotchas" one should look out for between versions.
## Minecraft 1.13 {#mc-1.13}
- The "key code" for [`key`] and [`key_up`] events has changed, due to Minecraft updating to LWJGL 3. Make sure you're
using the constants provided by the [`keys`] API, rather than hard-coding numerical values.
Related to this change, the numpad enter key now has a different key code to the enter key. You may need to adjust
your programs to handle both. (Note, the `keys.numpadEnter` constant was defined in pre-1.13 versions of CC, but the
`keys.enter` constant was queued when the key was pressed)
- Minecraft 1.13 removed the concept of item damage and block metadata (see ["The Flattening"][flattening]). As a
result `turtle.inspect` no longer provides block metadata, and `turtle.getItemDetail` no longer provides damage.
- Block states (`turtle.inspect().state`) should provide all the same information as block metadata, but in a much
more understandable format.
- Item and block names now represent a unique item type. For instance, wool is split into 16 separate items
(`minecraft:white_wool`, etc...) rather than a single `minecraft:wool` with each meta/damage value specifying the
colour.
- Custom ROMs are now provided using data packs rather than resource packs. This should mostly be a matter of renaming
the "assets" folder to "data", and placing it in "datapacks", but there are a couple of other gotchas to look out
for:
- Data packs [impose some restrictions on file names][legal_data_pack]. As a result, your programs and directories
must all be lower case.
- Due to how data packs are read by CC: Tweaked, you may need to use the `/reload` command to see changes to your
pack show up on the computer.
See [the example datapack][datapack-example] for how to get started.
- Turtles can now be waterlogged and move "through" water sources rather than breaking them.
## CC: Tweaked 1.88.0 {#cc-1.88}
- Unlabelled computers and turtles now keep their ID when broken, meaning that unlabelled computers/items do not stack.
## ComputerCraft 1.80pr1 {#cc-1.80}
- Programs run via `shell.run` are now started in their own isolated environment. This means globals set by programs
will not be accessible outside of this program.
- Programs containing `/` are looked up in the current directory and are no longer looked up on the path. For instance,
you can no longer type `turtle/excavate` to run `/rom/programs/turtle/excavate.lua`.
[flattening]: https://minecraft.wiki.com/w/Java_Edition_1.13/Flattening
[legal_data_pack]: https://minecraft.gamepedia.com/Tutorials/Creating_a_data_pack#Legal_characters
[datapack-example]: https://github.com/cc-tweaked/datapack-example "An example datapack for CC: Tweaked"