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.

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.

CC: Tweaked 1.109.0 to 1.109.3

• Update to Lua 5.2:

  • Support for Lua 5.0's pseudo-argument arg has been removed. You should always use ... for varargs.
  • Environments are no longer baked into the runtime, and instead use the _ENV local or upvalue. getfenv/setfenv now only work on Lua functions with an _ENV upvalue. getfenv will return the global environment when called with other functions, and setfenv will have no effect.
  • load/loadstring defaults to using the global environment (_G) rather than the current coroutine's environment.
  • Support for dumping functions (string.dump) and loading binary chunks has been removed.
  • math.random now uses Lua 5.4's random number generator.

• File handles, HTTP requests and websockets now always use the original bytes rather than encoding/decoding to UTF-8.

Minecraft 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"). 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. 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 for how to get started.

• Turtles can now be waterlogged and move "through" water sources rather than breaking them.

CC: Tweaked 1.88.0

• Unlabelled computers and turtles now keep their ID when broken, meaning that unlabelled computers/items do not stack.

ComputerCraft 1.80pr1

• 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.