Bump CC:T to 1.108.4

Add additional tests for filesystems/mounts
This tries to cover some holes in our existing coverage. - Port some of our Java readable handle tests to Lua (and also clean up the Java versions to stop using ObjectWrapper - that dates to pre-@LuaFunction!) - Test a couple of discrepancies between binary and text handles. This is mostly to do with the original number-based .read() and .write() interface for binary handles. - Fix a couple of edge cases in file-size accounting.
2025-10-15 14:07:38 +00:00 · 2023-10-29 12:02:11 +00:00 · 2023-10-29 12:01:26 +00:00 · 2023-10-28 20:00:56 +01:00 · 2023-10-28 17:58:11 +01:00 · 2023-10-26 22:06:40 +01:00
3523 changed files with 116362 additions and 98365 deletions
--- a/.editorconfig
+++ b/.editorconfig
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: CC0-1.0
+
 root = true

 [*]
@@ -8,6 +12,17 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true

+ij_continuation_indent_size = 4
+ij_any_do_while_brace_force = if_multiline
+ij_any_if_brace_force = if_multiline
+ij_any_for_brace_force = if_multiline
+ij_any_spaces_within_array_initializer_braces = true
+
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true
+ij_kotlin_method_parameters_wrap = off
+ij_kotlin_call_parameters_wrap = off
+
 [*.md]
 trim_trailing_whitespace = false

--- a/.git-blame-ignore-revs
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: CC0-1.0
+
+# Reformat everything
+f478c4ffc4fb9fc2200ec9b0bc751d047057ce81
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,12 +1,17 @@
+# SPDX-FileCopyrightText: 2020 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: CC0-1.0
+
 # Ignore changes in generated files
-src/generated/** linguist-generated
-src/testMod/server-files/structures linguist-generated
+projects/*/src/generated/** linguist-generated
+projects/common/src/testMod/resources/data/cctest/structures/* linguist-generated

 * text=auto

 *.gradle eol=lf diff=java
 *.java   eol=lf diff=java
 *.kt     eol=lf diff=java
+*.kts    eol=lf diff=java
 *.lua    eol=lf
 *.md     eol=lf diff=markdown
 *.txt    eol=lf
--- a/.github/ISSUE_TEMPLATE/bug_report.yaml
+++ b/.github/ISSUE_TEMPLATE/bug_report.yaml
@@ -11,6 +11,7 @@ body:
      - 1.16.x
      - 1.18.x
      - 1.19.x
+      - 1.20.x
  validations:
    required: true
 - type: input
--- a/.github/workflows/main-ci.yml
+++ b/.github/workflows/main-ci.yml
@@ -8,16 +8,16 @@ jobs:
    runs-on: ubuntu-latest

    steps:
-    - name: Clone repository
+    - name: 📥 Clone repository
      uses: actions/checkout@v3

-    - name: Set up Java
+    - name: 📥 Set up Java
      uses: actions/setup-java@v3
      with:
-        java-version: 8
+        java-version: 17
        distribution: 'temurin'

-    - name: Setup Gradle
+    - name: 📥 Setup Gradle
      uses: gradle/gradle-build-action@v2
      with:
        cache-read-only: ${{ !startsWith(github.ref, 'refs/heads/mc-') }}
@@ -27,24 +27,78 @@ jobs:
        mkdir -p ~/.gradle
        echo "org.gradle.daemon=false" >> ~/.gradle/gradle.properties

-    - name: Build with Gradle
-      run: |
-        ./gradlew assemble || ./gradlew assemble
-        ./gradlew downloadAssets || ./gradlew downloadAssets
-        ./gradlew build
+    - name: ⚒️ Build
+      run: ./gradlew assemble || ./gradlew assemble

-    - name: Upload Jar
-      uses: actions/upload-artifact@v2
-      with:
-        name: CC-Tweaked
-        path: build/libs
+    - name: 💡 Lint
+      uses: pre-commit/action@v3.0.0

-    - name: Upload coverage
-      uses: codecov/codecov-action@v2
+    - name: 🧪 Run tests
+      run: ./gradlew test validateMixinNames checkChangelog

-    - name: Parse test reports
+    - name: 📥 Download assets for game tests
+      run: ./gradlew downloadAssets || ./gradlew downloadAssets
+
+    - name: 🧪 Run integration tests
+      run: ./gradlew runGametest
+
+    - name: 🧪 Run client tests
+      run: ./gradlew runGametestClient # Not checkClient, as no point running rendering tests.
+      # These are a little flaky on GH actions: its useful to run them, but don't break the build.
+      continue-on-error: true
+
+    - name: 🧪 Parse test reports
      run: ./tools/parse-reports.py
      if: ${{ failure() }}

-    - name: Run linters
-      uses: pre-commit/action@v3.0.0
+    - name: 📦 Prepare Jars
+      run: |
+        # Find the main jar and append the git hash onto it.
+        mkdir -p jars
+        find projects/forge/build/libs projects/fabric/build/libs -type f -regex '.*[0-9.]+\(-SNAPSHOT\)?\.jar$' -exec bash -c 'cp {} "jars/$(basename {} .jar)-$(git rev-parse HEAD).jar"' \;
+
+    - name: 📤 Upload Jar
+      uses: actions/upload-artifact@v3
+      with:
+        name: CC-Tweaked
+        path: ./jars
+
+    - name: 📤 Upload coverage
+      uses: codecov/codecov-action@v3
+
+  build-core:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - name: Windows
+          uses: windows-latest
+
+        - name: macOS
+          uses: macos-latest
+
+    name: Test on ${{ matrix.name }}
+    runs-on: ${{ matrix.uses }}
+
+    steps:
+    - name: Clone repository
+      uses: actions/checkout@v3
+
+    - name: Set up Java
+      uses: actions/setup-java@v3
+      with:
+        java-version: 17
+        distribution: 'temurin'
+
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+      with:
+        cache-read-only: ${{ !startsWith(github.ref, 'refs/heads/mc-') }}
+
+    - name: Run tests
+      run: |
+        ./gradlew --configure-on-demand :core:test
+
+    - name: Parse test reports
+      run: python3 ./tools/parse-reports.py
+      if: ${{ failure() }}
--- a/.github/workflows/make-doc.sh
+++ b/.github/workflows/make-doc.sh
@@ -12,8 +12,8 @@ chmod 600 "$HOME/.ssh/key"

 # And upload
 rsync -avc -e "ssh -i $HOME/.ssh/key -o StrictHostKeyChecking=no -p $SSH_PORT" \
-      "$GITHUB_WORKSPACE/build/docs/site/" \
+      "$GITHUB_WORKSPACE/projects/web/build/site/" \
      "$SSH_USER@$SSH_HOST:/$DEST"
 rsync -avc -e "ssh -i $HOME/.ssh/key -o StrictHostKeyChecking=no -p $SSH_PORT" \
-      "$GITHUB_WORKSPACE/build/docs/javadoc/" \
+      "$GITHUB_WORKSPACE/projects/common-api/build/docs/javadoc/" \
      "$SSH_USER@$SSH_HOST:/$DEST/javadoc"
--- a/.github/workflows/make-doc.yml
+++ b/.github/workflows/make-doc.yml
@@ -3,7 +3,8 @@ name: Build documentation
 on:
  push:
    branches:
-    - mc-1.16.x
+    - mc-1.19.x
+    - mc-1.20.x

 jobs:
  make_doc:
@@ -17,7 +18,7 @@ jobs:
    - name: Set up Java
      uses: actions/setup-java@v1
      with:
-        java-version: 8
+        java-version: 17
        distribution: 'temurin'

    - name: Setup Gradle
@@ -29,7 +30,7 @@ jobs:
      run: ./gradlew compileJava --no-daemon || ./gradlew compileJava --no-daemon

    - name: Generate documentation
-      run: ./gradlew docWebsite javadoc --no-daemon
+      run: ./gradlew docWebsite :common-api:javadoc  --no-daemon

    - name: Upload documentation
      run: .github/workflows/make-doc.sh 2> /dev/null
--- a/.gitignore
+++ b/.gitignore
@@ -1,16 +1,24 @@
+# SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: CC0-1.0
+
 # Build directories
 /classes
 /logs
 /build
+/projects/*/logs
+/projects/*/build
 /buildSrc/build
 /out
+/buildSrc/out
+/jars
 /doc/out/
 /node_modules
-/.jqwik-database
+.jqwik-database

 # Runtime directories
 /run
-/run-*
+/projects/*/run

 *.ipr
 *.iws
@@ -23,8 +31,6 @@
 /.project
 /.settings
 /.vscode
-bin/
 *.launch

-/src/generated/resources/.cache
-/src/web/mount/*.d.ts
+/projects/*/src/generated/resources/.cache
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: MPL-2.0
+
 image:
  file: config/gitpod/Dockerfile

--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,8 +1,12 @@
+# SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: CC0-1.0
+
 # See https://pre-commit.com for more information
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.0.1
+  rev: v4.4.0
  hooks:
  - id: trailing-whitespace
  - id: end-of-file-fixer
@@ -16,12 +20,17 @@ repos:
    exclude: "tsconfig\\.json$"

 - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
-  rev: 2.3.54
+  rev: 2.7.2
  hooks:
  - id: editorconfig-checker
    args: ['-disable-indentation']
    exclude: "^(.*\\.(bat)|LICENSE)$"

+- repo: https://github.com/fsfe/reuse-tool
+  rev: v2.1.0
+  hooks:
+  - id: reuse
+
 - repo: local
  hooks:
  - id: license
@@ -35,7 +44,7 @@ repos:
    name: Check Java codestyle
    files: ".*\\.java$"
    language: system
-    entry: ./gradlew checkstyleMain checkstyleTest
+    entry: ./gradlew checkstyle
    pass_filenames: false
    require_serial: true
  - id: illuaminate
@@ -48,9 +57,7 @@ repos:

 exclude: |
  (?x)^(
-    src/generated|
-    src/test/resources/test-rom/data/json-parsing/|
-    src/testMod/server-files/|
-    config/idea/|
+    projects/[a-z]+/src/generated|
+    projects/core/src/test/resources/test-rom/data/json-parsing/|
    .*\.dfpwm
  )
--- a/.reuse/dep5
+++ b/.reuse/dep5
@@ -0,0 +1,100 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Source: https://github.com/cc-tweaked/cc-tweaked
+Upstream-Name: CC: Tweaked
+Upstream-Contact: Jonathan Coates <git@squiddev.cc>
+
+Files:
+  projects/common/src/main/resources/assets/computercraft/sounds.json
+  projects/common/src/main/resources/assets/computercraft/sounds/empty.ogg
+  projects/common/src/testMod/resources/data/cctest/computercraft/turtle_upgrades/*
+  projects/common/src/testMod/resources/data/cctest/structures/*
+  projects/fabric/src/generated/*
+  projects/forge/src/generated/*
+  projects/web/src/htmlTransform/export/index.json
+  projects/web/src/htmlTransform/export/items/minecraft/*
+Comment: Generated/data files are CC0.
+Copyright: The CC: Tweaked Developers
+License: CC0-1.0
+
+Files:
+  doc/images/*
+  package.json
+  package-lock.json
+  projects/common/src/client/resources/computercraft-client.mixins.json
+  projects/common/src/main/resources/assets/minecraft/shaders/core/computercraft/monitor_tbo.json
+  projects/common/src/main/resources/computercraft.mixins.json
+  projects/common/src/testMod/resources/computercraft-gametest.mixins.json
+  projects/common/src/testMod/resources/data/computercraft/loot_tables/treasure_disk.json
+  projects/common/src/testMod/resources/pack.mcmeta
+  projects/core/src/main/resources/data/computercraft/lua/rom/modules/command/.ignoreme
+  projects/core/src/main/resources/data/computercraft/lua/rom/modules/main/.ignoreme
+  projects/core/src/main/resources/data/computercraft/lua/rom/modules/turtle/.ignoreme
+  projects/core/src/main/resources/data/computercraft/lua/rom/motd.txt
+  projects/fabric-api/src/main/modJson/fabric.mod.json
+  projects/fabric/src/client/resources/computercraft-client.fabric.mixins.json
+  projects/fabric/src/main/resources/computercraft.fabric.mixins.json
+  projects/fabric/src/main/resources/fabric.mod.json
+  projects/fabric/src/testMod/resources/computercraft-gametest.fabric.mixins.json
+  projects/fabric/src/testMod/resources/fabric.mod.json
+  projects/forge/src/client/resources/computercraft-client.forge.mixins.json
+  projects/web/src/frontend/mount/.settings
+  projects/web/src/frontend/mount/example.nfp
+  projects/web/src/frontend/mount/example.nft
+  projects/web/src/frontend/mount/expr_template.lua
+  projects/web/tsconfig.json
+Comment: Several assets where it's inconvenient to create a .license file.
+Copyright: The CC: Tweaked Developers
+License: MPL-2.0
+
+Files:
+  doc/logo.png
+  doc/logo-darkmode.png
+  projects/common/src/main/resources/assets/computercraft/models/*
+  projects/common/src/main/resources/assets/computercraft/textures/*
+  projects/common/src/main/resources/pack.mcmeta
+  projects/common/src/main/resources/pack.png
+  projects/core/src/main/resources/assets/computercraft/textures/gui/term_font.png
+  projects/core/src/main/resources/data/computercraft/lua/rom/autorun/.ignoreme
+  projects/core/src/main/resources/data/computercraft/lua/rom/help/*
+  projects/core/src/main/resources/data/computercraft/lua/rom/programs/fun/advanced/levels/*
+  projects/web/src/htmlTransform/export/items/computercraft/*
+Comment: Bulk-license original assets as CCPL.
+Copyright: 2011 Daniel Ratcliffe
+License: LicenseRef-CCPL
+
+Files:
+  projects/common/src/main/resources/assets/computercraft/lang/cs_cz.json
+  projects/common/src/main/resources/assets/computercraft/lang/ko_kr.json
+  projects/common/src/main/resources/assets/computercraft/lang/pl_pl.json
+  projects/common/src/main/resources/assets/computercraft/lang/pt_br.json
+  projects/common/src/main/resources/assets/computercraft/lang/ru_ru.json
+  projects/common/src/main/resources/assets/computercraft/lang/uk_ua.json
+  projects/common/src/main/resources/assets/computercraft/lang/zh_cn.json
+Comment: Community-contributed license files
+Copyright: 2017 The CC: Tweaked Developers
+License: LicenseRef-CCPL
+
+Files:
+  projects/common/src/main/resources/assets/computercraft/lang/*
+Comment: Community-contributed license files
+Copyright: 2017 The CC: Tweaked Developers
+License: MPL-2.0
+
+Files:
+  .github/*
+Comment:
+  GitHub build scripts are CC0. While we could add a header to each file,
+  it's unclear if it will break actions or issue templates in some way.
+Copyright: Jonathan Coates <git@squiddev.cc>
+License: CC0-1.0
+
+Files:
+  gradle/wrapper/*
+  gradlew
+  gradlew.bat
+Copyright: Gradle Inc
+License: Apache-2.0
+
+Files: projects/core/src/test/resources/test-rom/data/json-parsing/*
+Copyright: 2016 Nicolas Seriot
+License: MIT
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2014 Coraline Ada Ehmke and contributors
+
+SPDX-License-Identifier: CC-BY-4.0
+-->

 # Contributor Covenant Code of Conduct

--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,100 +1,105 @@
+<!--
+SPDX-FileCopyrightText: 2020 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Contributing to CC: Tweaked
 As with many open source projects, CC: Tweaked thrives on contributions from other people! This document (hopefully)
-provides an introduction as to how to get started in helping out.
+provides an introduction as to how to get started with helping out.

 If you've any other questions, [just ask the community][community] or [open an issue][new-issue].

+## Table of Contents
+ - [Reporting issues](#reporting-issues)
+ - [Translations](#translations)
+ - [Setting up a development environment](#setting-up-a-development-environment)
+ - [Developing CC: Tweaked](#developing-cc-tweaked)
+ - [Writing documentation](#writing-documentation)
+
 ## Reporting issues
-If you have a bug, suggestion, or other feedback, the best thing to do is [file an issue][new-issue]. When doing so,
-do use the issue templates - they provide a useful hint on what information to provide.
+If you have a bug, suggestion, or other feedback, the best thing to do is [file an issue][new-issue]. When doing so, do
+use the issue templates - they provide a useful hint on what information to provide.

 ## Translations
 Translations are managed through [Weblate], an online interface for managing language strings. This is synced
 automatically with GitHub, so please don't submit PRs adding/changing translations!

-## Developing
-In order to develop CC: Tweaked, you'll need to download the source code and then run it. This is a pretty simple
-process. When building on Windows, Use `gradlew.bat` instead of `./gradlew`.
+## Setting up a development environment
+In order to develop CC: Tweaked, you'll need to download the source code and then run it.

- - **Clone the repository:** `git clone https://github.com/cc-tweaked/CC-Tweaked.git && cd CC-Tweaked`
- - **Setup Forge:** `./gradlew build`
- - **Run Minecraft:** `./gradlew runClient` (or run the `GradleStart` class from your IDE).
- - **Optionally:** For small PRs (especially those only touching Lua code), it may be easier to use GitPod, which
-   provides a pre-configured environment: [![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-2b2b2b?logo=gitpod)](https://gitpod.io/#https://github.com/cc-tweaked/CC-Tweaked/)
+ - Make sure you've got the following software installed:
+   - Java Development Kit (JDK) installed. This can be downloaded from [Adoptium].
+   - [Git](https://git-scm.com/).
+   - If you want to work on documentation, [NodeJS][node].

-   Do note you will need to download the mod after compiling to test.
+ - Download CC: Tweaked's source code:
+   ```
+   git clone https://github.com/cc-tweaked/CC-Tweaked.git
+   cd CC-Tweaked
+   ```

-If you want to run CC:T in a normal Minecraft instance, run `./gradlew build` and copy the `.jar` from `build/libs`.
-These commands may take a few minutes to run the first time, as the environment is set up, but should be much faster
-afterwards.
+ - Build CC: Tweaked with `./gradlew build`. This will be very slow the first time it runs, as it needs to download a
+   lot of dependencies (and decompile Minecraft several times). Subsequent runs should be much faster!

-The following sections describe the more niche sections of CC: Tweaked's build system. Some bits of these are
-quite-complex, and (dare I say) over-engineered, so you may wish to ignore them. Well tested/documented PRs are always
-preferred (and I'd definitely recommend setting up the tooling if you're doing serious development work), but for
-small changes it can be a lot.
+ - You're now ready to start developing CC: Tweaked. Running `./gradlew :forge:runClient` or
+   `./gradle :fabric:runClient` will start Minecraft under Forge and Fabric respectively.

-### Code linters
-CC: Tweaked uses a couple of "linters" on its source code, to enforce a consistent style across the project. While these
-are run whenever you submit a PR, it's often useful to run this before committing.
+If you want to run CC:T in a normal Minecraft instance, run `./gradlew assemble` and copy the `.jar` from
+`projects/forge/build/libs` (for Forge) or `projects/fabric/build/libs` (for Fabric).

- - **[Checkstyle]:** Checks Java code to ensure it is consistently formatted. This can be run with `./gradlew build` or
-   `./gradle check`.
- - **[illuaminate]:** Checks Lua code for semantic and styleistic issues. This can be run with `./gradlew lintLua`.
+## Developing CC: Tweaked
+Before making any major changes to CC: Tweaked, I'd recommend you have a read of the [the architecture
+document][architecture] first. While it's not a comprehensive document, it gives a good hint of where you should start
+looking to make your changes. As always, if you're not sure, [do ask the community][community]!

-### Documentation
+### Testing
+When making larger changes, it may be useful to write a test to make sure your code works as expected.
+
+CC: Tweaked has several test suites, each designed to test something different:
+
+ - In order to test CraftOS and its builtin APIs, we have a test suite written in Lua located at
+   `projects/core/src/test/resources/test-rom/`. These don't rely on any Minecraft code, which means they can run on
+   emulators, acting as a sort of compliance test.
+
+   These tests are written using a test system called "mcfly", heavily inspired by [busted]. Groups of tests go inside
+   `describe` blocks, and a single test goes inside `it`. Assertions are generally written using `expect` (inspired by
+   Hamcrest and the like). For instance, `expect(foo):eq("bar")` asserts that your variable `foo` is equal to the
+   expected value `"bar"`.
+
+   These tests can be run with `./gradlew :core:test`.
+
+ - In-game functionality, such as the behaviour of blocks and items, is tested using [Minecraft's gametest
+   system][mc-test] (`projects/common/src/testMod`). These tests spin up a server, spawn a structure for each test, and
+   then run some code on the blocks defined in that structure.
+
+   These tests can be run with `./gradlew runGametest` (or `./gradle :forge:runGametest`/`./gradlew :fabric:runGametest`
+   for a single loader).
+
+For more information, [see the architecture document][architecture].
+
+## Writing documentation
 When writing documentation for [CC: Tweaked's documentation website][docs], it may be useful to build the documentation
 and preview it yourself before submitting a PR.

-Our documentation generation pipeline is rather complex, and involves invoking several external tools. Most of this
-complexity is hidden by Gradle, but you will need to perform some initial setup:
+You'll first need to [set up a development environment as above](#setting-up-a-development-environment).

- - Install [Node/npm][node].
- - Run `npm ci` to install our Node dependencies.
+Once this is set up, you can now run `./gradlew docWebsite`. This generates documentation from our Lua and Java code,
+writing the resulting HTML into `./projects/web/build/site`, which can then be opened in a browser. When iterating on
+documentation, you can instead run `./gradlew docWebsite -t`, which will rebuild documentation every time you change a
+file.

-You can now run `./gradlew docWebsite`. This generates documentation from our Lua and Java code, writing the resulting
-HTML into `./build/docs/site`.
+Documentation is built using [illuaminate] which, while not currently documented (somewhat ironic), is largely the same
+as [ldoc][ldoc]. Documentation comments are written in Markdown, though note that we do not support many GitHub-specific
+markdown features. If you can, do check what the documentation looks like locally!

-#### Writing documentation
-illuaminate's documentation system is not currently documented (somewhat ironic), but is _largely_ the same as
-[ldoc][ldoc]. Documentation comments are written in Markdown,
-
-Our markdown engine does _not_ support GitHub flavoured markdown, and so does not support all the features one might
-expect. It is recommended that you build and preview the docs locally first.
-
-When iterating on documentation, you can get Gradle to rebuild the website every time a file changes by running
-`./gradlew docWebsite -t`. This will take a couple of seconds to run, but definitely beats running it manually!
-
-### Testing
-Thankfully running tests is much simpler than running the documentation generator! `./gradlew check` will run the
-entire test suite (and some additional bits of verification).
-
-Before we get into writing tests, it's worth mentioning the various test suites that CC: Tweaked has:
- - "Core" Java (`./src/test/java`): These test core bits of the mod which don't require any Minecraft interaction.
-   This includes the `@LuaFunction` system, file system code, etc...
-
-   These tests are run by `./gradlew test`.
-
- - CraftOS (`./src/test/resources/test-rom/`): These tests are written in Lua, and ensure the Lua environment, libraries
-   and programs work as expected. These are (generally) written to be able to be run on emulators too, to provide some
-   sort of compliance test.
-
-   These tests are run by the '"Core" Java' test suite, and so are also run with `./gradlew test`.
-
- - In-game (`./src/testMod/java/dan200/computercraft/ingame/`): These tests are run on an actual Minecraft server, using
-   the same system Mojang do][mc-test]. The aim of these is to test in-game behaviour of blocks and peripherals.
-
-   These tests are run with `./gradlew runGametest`.
-
-## CraftOS tests
-CraftOS's tests are written using a test system called "mcfly", heavily inspired by [busted] (and thus RSpec). Groups of
-tests go inside `describe` blocks, and a single test goes inside `it`.
-
-Assertions are generally written using `expect` (inspired by Hamcrest and the like). For instance, `expect(foo):eq("bar")`
-asserts that your variable `foo` is equal to the expected value `"bar"`.
+When writing long-form documentation (such as the guides in [doc/guides](doc/guides)), I find it useful to tell a
+narrative. Think of what you want the user to learn or achieve, then start introducing a simple concept, and then talk
+about how you can build on that until you've covered everything!

 [new-issue]: https://github.com/cc-tweaked/CC-Tweaked/issues/new/choose "Create a new issue"
-[community]: README.md#Community "Get in touch with the community."
-[checkstyle]: https://checkstyle.org/
+[community]: README.md#community "Get in touch with the community."
+[Adoptium]: https://adoptium.net/temurin/releases?version=17 "Download OpenJDK 17"
 [illuaminate]: https://github.com/SquidDev/illuaminate/ "Illuaminate on GitHub"
 [weblate]: https://i18n.tweaked.cc/projects/cc-tweaked/minecraft/ "CC: Tweaked weblate instance"
 [docs]: https://tweaked.cc/ "CC: Tweaked documentation"
@@ -102,3 +107,4 @@ asserts that your variable `foo` is equal to the expected value `"bar"`.
 [mc-test]: https://www.youtube.com/watch?v=vXaWOJTCYNg
 [busted]: https://github.com/Olivine-Labs/busted "busted: Elegant Lua unit testing."
 [node]: https://nodejs.org/en/ "Node.js"
+[architecture]: projects/ARCHITECTURE.md
--- a/LICENSES/Apache-2.0.txt
+++ b/LICENSES/Apache-2.0.txt
@@ -0,0 +1,73 @@
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--- a/LICENSES/CC-BY-3.0.txt
+++ b/LICENSES/CC-BY-3.0.txt
@@ -0,0 +1,93 @@
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--- a/LICENSES/CC-BY-4.0.txt
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+     c.	Copyright and Similar Rights means copyright and/or similar rights closely related to copyright including, without limitation, performance, broadcast, sound recording, and Sui Generis Database Rights, without regard to how the rights are labeled or categorized. For purposes of this Public License, the rights specified in Section 2(b)(1)-(2) are not Copyright and Similar Rights.
+
+     d.	Effective Technological Measures means those measures that, in the absence of proper authority, may not be circumvented under laws fulfilling obligations under Article 11 of the WIPO Copyright Treaty adopted on December 20, 1996, and/or similar international agreements.
+
+     e.	Exceptions and Limitations means fair use, fair dealing, and/or any other exception or limitation to Copyright and Similar Rights that applies to Your use of the Licensed Material.
+
+     f.	Licensed Material means the artistic or literary work, database, or other material to which the Licensor applied this Public License.
+
+     g.	Licensed Rights means the rights granted to You subject to the terms and conditions of this Public License, which are limited to all Copyright and Similar Rights that apply to Your use of the Licensed Material and that the Licensor has authority to license.
+
+     h.	Licensor means the individual(s) or entity(ies) granting rights under this Public License.
+
+     i.	Share means to provide material to the public by any means or process that requires permission under the Licensed Rights, such as reproduction, public display, public performance, distribution, dissemination, communication, or importation, and to make material available to the public including in ways that members of the public may access the material from a place and at a time individually chosen by them.
+
+     j.	Sui Generis Database Rights means rights other than copyright resulting from Directive 96/9/EC of the European Parliament and of the Council of 11 March 1996 on the legal protection of databases, as amended and/or succeeded, as well as other essentially equivalent rights anywhere in the world.
+
+     k.	You means the individual or entity exercising the Licensed Rights under this Public License. Your has a corresponding meaning.
+
+Section 2 – Scope.
+
+     a.	License grant.
+
+          1. Subject to the terms and conditions of this Public License, the Licensor hereby grants You a worldwide, royalty-free, non-sublicensable, non-exclusive, irrevocable license to exercise the Licensed Rights in the Licensed Material to:
+
+               A. reproduce and Share the Licensed Material, in whole or in part; and
+
+               B. produce, reproduce, and Share Adapted Material.
+
+          2. Exceptions and Limitations. For the avoidance of doubt, where Exceptions and Limitations apply to Your use, this Public License does not apply, and You do not need to comply with its terms and conditions.
+
+          3. Term. The term of this Public License is specified in Section 6(a).
+
+          4. Media and formats; technical modifications allowed. The Licensor authorizes You to exercise the Licensed Rights in all media and formats whether now known or hereafter created, and to make technical modifications necessary to do so. The Licensor waives and/or agrees not to assert any right or authority to forbid You from making technical modifications necessary to exercise the Licensed Rights, including technical modifications necessary to circumvent Effective Technological Measures. For purposes of this Public License, simply making modifications authorized by this Section 2(a)(4) never produces Adapted Material.
+
+          5. Downstream recipients.
+
+               A. Offer from the Licensor – Licensed Material. Every recipient of the Licensed Material automatically receives an offer from the Licensor to exercise the Licensed Rights under the terms and conditions of this Public License.
+
+               B. No downstream restrictions. You may not offer or impose any additional or different terms or conditions on, or apply any Effective Technological Measures to, the Licensed Material if doing so restricts exercise of the Licensed Rights by any recipient of the Licensed Material.
+
+          6.  No endorsement. Nothing in this Public License constitutes or may be construed as permission to assert or imply that You are, or that Your use of the Licensed Material is, connected with, or sponsored, endorsed, or granted official status by, the Licensor or others designated to receive attribution as provided in Section 3(a)(1)(A)(i).
+
+b. Other rights.
+
+          1. Moral rights, such as the right of integrity, are not licensed under this Public License, nor are publicity, privacy, and/or other similar personality rights; however, to the extent possible, the Licensor waives and/or agrees not to assert any such rights held by the Licensor to the limited extent necessary to allow You to exercise the Licensed Rights, but not otherwise.
+
+          2. Patent and trademark rights are not licensed under this Public License.
+
+          3. To the extent possible, the Licensor waives any right to collect royalties from You for the exercise of the Licensed Rights, whether directly or through a collecting society under any voluntary or waivable statutory or compulsory licensing scheme. In all other cases the Licensor expressly reserves any right to collect such royalties.
+
+Section 3 – License Conditions.
+
+Your exercise of the Licensed Rights is expressly made subject to the following conditions.
+
+     a.	Attribution.
+
+          1. If You Share the Licensed Material (including in modified form), You must:
+
+               A. retain the following if it is supplied by the Licensor with the Licensed Material:
+
+                    i. identification of the creator(s) of the Licensed Material and any others designated to receive attribution, in any reasonable manner requested by the Licensor (including by pseudonym if designated);
+
+                    ii. a copyright notice;
+
+                    iii. a notice that refers to this Public License;
+
+                    iv.	a notice that refers to the disclaimer of warranties;
+
+                    v. a URI or hyperlink to the Licensed Material to the extent reasonably practicable;
+
+               B. indicate if You modified the Licensed Material and retain an indication of any previous modifications; and
+
+               C. indicate the Licensed Material is licensed under this Public License, and include the text of, or the URI or hyperlink to, this Public License.
+
+          2. You may satisfy the conditions in Section 3(a)(1) in any reasonable manner based on the medium, means, and context in which You Share the Licensed Material. For example, it may be reasonable to satisfy the conditions by providing a URI or hyperlink to a resource that includes the required information.
+
+          3. If requested by the Licensor, You must remove any of the information required by Section 3(a)(1)(A) to the extent reasonably practicable.
+
+          4. If You Share Adapted Material You produce, the Adapter's License You apply must not prevent recipients of the Adapted Material from complying with this Public License.
+
+Section 4 – Sui Generis Database Rights.
+
+Where the Licensed Rights include Sui Generis Database Rights that apply to Your use of the Licensed Material:
+
+     a.	for the avoidance of doubt, Section 2(a)(1) grants You the right to extract, reuse, reproduce, and Share all or a substantial portion of the contents of the database;
+
+     b.	if You include all or a substantial portion of the database contents in a database in which You have Sui Generis Database Rights, then the database in which You have Sui Generis Database Rights (but not its individual contents) is Adapted Material; and
+
+     c.	You must comply with the conditions in Section 3(a) if You Share all or a substantial portion of the contents of the database.
+For the avoidance of doubt, this Section 4 supplements and does not replace Your obligations under this Public License where the Licensed Rights include other Copyright and Similar Rights.
+
+Section 5 – Disclaimer of Warranties and Limitation of Liability.
+
+     a.	Unless otherwise separately undertaken by the Licensor, to the extent possible, the Licensor offers the Licensed Material as-is and as-available, and makes no representations or warranties of any kind concerning the Licensed Material, whether express, implied, statutory, or other. This includes, without limitation, warranties of title, merchantability, fitness for a particular purpose, non-infringement, absence of latent or other defects, accuracy, or the presence or absence of errors, whether or not known or discoverable. Where disclaimers of warranties are not allowed in full or in part, this disclaimer may not apply to You.
+
+     b.	To the extent possible, in no event will the Licensor be liable to You on any legal theory (including, without limitation, negligence) or otherwise for any direct, special, indirect, incidental, consequential, punitive, exemplary, or other losses, costs, expenses, or damages arising out of this Public License or use of the Licensed Material, even if the Licensor has been advised of the possibility of such losses, costs, expenses, or damages. Where a limitation of liability is not allowed in full or in part, this limitation may not apply to You.
+
+     c.	The disclaimer of warranties and limitation of liability provided above shall be interpreted in a manner that, to the extent possible, most closely approximates an absolute disclaimer and waiver of all liability.
+
+Section 6 – Term and Termination.
+
+     a.	This Public License applies for the term of the Copyright and Similar Rights licensed here. However, if You fail to comply with this Public License, then Your rights under this Public License terminate automatically.
+
+     b.	Where Your right to use the Licensed Material has terminated under Section 6(a), it reinstates:
+
+          1. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or
+
+          2. upon express reinstatement by the Licensor.
+
+     c.	For the avoidance of doubt, this Section 6(b) does not affect any right the Licensor may have to seek remedies for Your violations of this Public License.
+
+     d.	For the avoidance of doubt, the Licensor may also offer the Licensed Material under separate terms or conditions or stop distributing the Licensed Material at any time; however, doing so will not terminate this Public License.
+
+     e.	Sections 1, 5, 6, 7, and 8 survive termination of this Public License.
+
+Section 7 – Other Terms and Conditions.
+
+     a.	The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.
+
+     b.	Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.
+
+Section 8 – Interpretation.
+
+     a.	For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.
+
+     b.	To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.
+
+     c.	No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.
+
+     d.	Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.
+
+Creative Commons is not a party to its public licenses. Notwithstanding, Creative Commons may elect to apply one of its public licenses to material it publishes and in those instances will be considered the “Licensor.” Except for the limited purpose of indicating that material is shared under a Creative Commons public license or as otherwise permitted by the Creative Commons policies published at creativecommons.org/policies, Creative Commons does not authorize the use of the trademark “Creative Commons” or any other trademark or logo of Creative Commons without its prior written consent including, without limitation, in connection with any unauthorized modifications to any of its public licenses or any other arrangements, understandings, or agreements concerning use of licensed material. For the avoidance of doubt, this paragraph does not form part of the public licenses.
+
+Creative Commons may be contacted at creativecommons.org.
--- a/LICENSES/CC0-1.0.txt
+++ b/LICENSES/CC0-1.0.txt
@@ -0,0 +1,121 @@
+Creative Commons Legal Code
+
+CC0 1.0 Universal
+
+    CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE
+    LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN
+    ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS
+    INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES
+    REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS
+    PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM
+    THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED
+    HEREUNDER.
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator
+and subsequent owner(s) (each and all, an "owner") of an original work of
+authorship and/or a database (each, a "Work").
+
+Certain owners wish to permanently relinquish those rights to a Work for
+the purpose of contributing to a commons of creative, cultural and
+scientific works ("Commons") that the public can reliably and without fear
+of later claims of infringement build upon, modify, incorporate in other
+works, reuse and redistribute as freely as possible in any form whatsoever
+and for any purposes, including without limitation commercial purposes.
+These owners may contribute to the Commons to promote the ideal of a free
+culture and the further production of creative, cultural and scientific
+works, or to gain reputation or greater distribution for their Work in
+part through the use and efforts of others.
+
+For these and/or other purposes and motivations, and without any
+expectation of additional consideration or compensation, the person
+associating CC0 with a Work (the "Affirmer"), to the extent that he or she
+is an owner of Copyright and Related Rights in the Work, voluntarily
+elects to apply CC0 to the Work and publicly distribute the Work under its
+terms, with knowledge of his or her Copyright and Related Rights in the
+Work and the meaning and intended legal effect of CC0 on those rights.
+
+1. Copyright and Related Rights. A Work made available under CC0 may be
+protected by copyright and related or neighboring rights ("Copyright and
+Related Rights"). Copyright and Related Rights include, but are not
+limited to, the following:
+
+  i. the right to reproduce, adapt, distribute, perform, display,
+     communicate, and translate a Work;
+ ii. moral rights retained by the original author(s) and/or performer(s);
+iii. publicity and privacy rights pertaining to a person's image or
+     likeness depicted in a Work;
+ iv. rights protecting against unfair competition in regards to a Work,
+     subject to the limitations in paragraph 4(a), below;
+  v. rights protecting the extraction, dissemination, use and reuse of data
+     in a Work;
+ vi. database rights (such as those arising under Directive 96/9/EC of the
+     European Parliament and of the Council of 11 March 1996 on the legal
+     protection of databases, and under any national implementation
+     thereof, including any amended or successor version of such
+     directive); and
+vii. other similar, equivalent or corresponding rights throughout the
+     world based on applicable law or treaty, and any national
+     implementations thereof.
+
+2. Waiver. To the greatest extent permitted by, but not in contravention
+of, applicable law, Affirmer hereby overtly, fully, permanently,
+irrevocably and unconditionally waives, abandons, and surrenders all of
+Affirmer's Copyright and Related Rights and associated claims and causes
+of action, whether now known or unknown (including existing as well as
+future claims and causes of action), in the Work (i) in all territories
+worldwide, (ii) for the maximum duration provided by applicable law or
+treaty (including future time extensions), (iii) in any current or future
+medium and for any number of copies, and (iv) for any purpose whatsoever,
+including without limitation commercial, advertising or promotional
+purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each
+member of the public at large and to the detriment of Affirmer's heirs and
+successors, fully intending that such Waiver shall not be subject to
+revocation, rescission, cancellation, termination, or any other legal or
+equitable action to disrupt the quiet enjoyment of the Work by the public
+as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason
+be judged legally invalid or ineffective under applicable law, then the
+Waiver shall be preserved to the maximum extent permitted taking into
+account Affirmer's express Statement of Purpose. In addition, to the
+extent the Waiver is so judged Affirmer hereby grants to each affected
+person a royalty-free, non transferable, non sublicensable, non exclusive,
+irrevocable and unconditional license to exercise Affirmer's Copyright and
+Related Rights in the Work (i) in all territories worldwide, (ii) for the
+maximum duration provided by applicable law or treaty (including future
+time extensions), (iii) in any current or future medium and for any number
+of copies, and (iv) for any purpose whatsoever, including without
+limitation commercial, advertising or promotional purposes (the
+"License"). The License shall be deemed effective as of the date CC0 was
+applied by Affirmer to the Work. Should any part of the License for any
+reason be judged legally invalid or ineffective under applicable law, such
+partial invalidity or ineffectiveness shall not invalidate the remainder
+of the License, and in such case Affirmer hereby affirms that he or she
+will not (i) exercise any of his or her remaining Copyright and Related
+Rights in the Work or (ii) assert any associated claims and causes of
+action with respect to the Work, in either case contrary to Affirmer's
+express Statement of Purpose.
+
+4. Limitations and Disclaimers.
+
+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
+    surrendered, licensed or otherwise affected by this document.
+ b. Affirmer offers the Work as-is and makes no representations or
+    warranties of any kind concerning the Work, express, implied,
+    statutory or otherwise, including without limitation warranties of
+    title, merchantability, fitness for a particular purpose, non
+    infringement, or the absence of latent or other defects, accuracy, or
+    the present or absence of errors, whether or not discoverable, all to
+    the greatest extent permissible under applicable law.
+ c. Affirmer disclaims responsibility for clearing rights of other persons
+    that may apply to the Work or any use thereof, including without
+    limitation any person's Copyright and Related Rights in the Work.
+    Further, Affirmer disclaims responsibility for obtaining any necessary
+    consents, permissions or other rights required for any use of the
+    Work.
+ d. Affirmer understands and acknowledges that Creative Commons is not a
+    party to this document and has no duty or obligation with respect to
+    this CC0 or use of the Work.
--- a/LICENSES/LicenseRef-CCPL.txt
+++ b/LICENSES/LicenseRef-CCPL.txt
--- a/LICENSES/MIT.txt
+++ b/LICENSES/MIT.txt
@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/LICENSES/MPL-2.0.txt
+++ b/LICENSES/MPL-2.0.txt
@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.
--- a/README.md
+++ b/README.md
@@ -1,11 +1,24 @@
-# ![CC: Tweaked](doc/logo.png)
-[![Current build status](https://github.com/cc-tweaked/CC-Tweaked/workflows/Build/badge.svg)](https://github.com/cc-tweaked/CC-Tweaked/actions "Current build status") [![Download CC: Tweaked on CurseForge](http://cf.way2muchnoise.eu/title/cc-tweaked.svg)][CurseForge]
+<!--
+SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="./doc/logo-darkmode.png">
+  <source media="(prefers-color-scheme: light)" srcset="./doc/logo.png">
+  <img alt="CC: Tweaked" src="./doc/logo.png">
+</picture>
+
+[![Current build status](https://github.com/cc-tweaked/CC-Tweaked/workflows/Build/badge.svg)](https://github.com/cc-tweaked/CC-Tweaked/actions "Current build status")
+[![Download CC: Tweaked on CurseForge](https://img.shields.io/static/v1?label=Download&message=CC:%20Tweaked&color=E04E14&logoColor=E04E14&logo=CurseForge)][CurseForge]
+[![Download CC: Tweaked on Modrinth](https://img.shields.io/static/v1?label=Download&color=00AF5C&logoColor=00AF5C&logo=Modrinth&message=CC:%20Tweaked)][Modrinth]

 CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles and more to the game. A fork of the
-much-beloved [ComputerCraft], it continues its legacy with better performance, stability, and a wealth of new features.
+much-beloved [ComputerCraft], it continues its legacy with improved performance and stability, along with a wealth of
+new features.

-CC: Tweaked can be installed from [CurseForge] or [Modrinth]. It requires the [Minecraft Forge][forge] mod loader, but
-[versions are available for Fabric][ccrestitched].
+CC: Tweaked can be installed from [CurseForge] or [Modrinth]. It runs on both [Minecraft Forge] and [Fabric].

 ## Contributing
 Any contribution is welcome, be that using the mod, reporting bugs or contributing code. If you want to get started
@@ -26,16 +39,39 @@ on is present.
 ```groovy
 repositories {
  maven {
-    url 'https://squiddev.cc/maven/'
+    url "https://squiddev.cc/maven/"
    content {
-      includeGroup 'org.squiddev'
+      includeGroup("cc.tweaked")
+      includeModule("org.squiddev", "Cobalt")
    }
  }
 }

 dependencies {
-  compileOnly fg.deobf("org.squiddev:cc-tweaked-${mc_version}:${cct_version}:api")
-  runtimeOnly fg.deobf("org.squiddev:cc-tweaked-${mc_version}:${cct_version}")
+  // Vanilla (i.e. for multi-loader systems)
+  compileOnly("cc.tweaked:cc-tweaked-$mcVersion-common-api:$cctVersion")
+
+  // Forge Gradle
+  compileOnly("cc.tweaked:cc-tweaked-$mcVersion-core-api:$cctVersion")
+  compileOnly(fg.deobf("cc.tweaked:cc-tweaked-$mcVersion-forge-api:$cctVersion"))
+  runtimeOnly(fg.deobf("cc.tweaked:cc-tweaked-$mcVersion-forge:$cctVersion"))
+
+  // Fabric Loom
+  modCompileOnly("cc.tweaked:cc-tweaked-$mcVersion-fabric-api:$cctVersion")
+  modRuntimeOnly("cc.tweaked:cc-tweaked-$mcVersion-fabric:$cctVersion")
+}
+```
+
+When using ForgeGradle, you may also need to add the following:
+
+```groovy
+minecraft {
+    runs {
+        configureEach {
+            property 'mixin.env.remapRefMap', 'true'
+            property 'mixin.env.refMapRemappingFile', "${buildDir}/createSrgToMcp/output.srg"
+        }
+    }
 }
 ```

@@ -49,8 +85,8 @@ the generated documentation [can be browsed online](https://tweaked.cc/javadoc/)
 [computercraft]: https://github.com/dan200/ComputerCraft "ComputerCraft on GitHub"
 [curseforge]: https://minecraft.curseforge.com/projects/cc-tweaked "Download CC: Tweaked from CurseForge"
 [modrinth]: https://modrinth.com/mod/gu7yAYhd "Download CC: Tweaked from Modrinth"
-[forge]: https://files.minecraftforge.net/ "Download Minecraft Forge."
-[ccrestitched]: https://www.curseforge.com/minecraft/mc-mods/cc-restitched "Download CC: Restitched from CurseForge"
+[Minecraft Forge]: https://files.minecraftforge.net/ "Download Minecraft Forge."
+[Fabric]: https://fabricmc.net/use/installer/ "Download Fabric."
 [forum]: https://forums.computercraft.cc/
 [GitHub Discussions]: https://github.com/cc-tweaked/CC-Tweaked/discussions
 [IRC]: https://webchat.esper.net/?channels=computercraft "#computercraft on EsperNet"
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,394 +1,26 @@
-import cc.tweaked.gradle.*
-import net.darkhax.curseforgegradle.TaskPublishCurseForge
-import net.minecraftforge.gradle.common.util.RunConfig
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+import cc.tweaked.gradle.JUnitExt
+import net.fabricmc.loom.api.LoomGradleExtensionAPI
+import net.fabricmc.loom.util.gradle.SourceSetHelper
+import org.jetbrains.gradle.ext.compiler
+import org.jetbrains.gradle.ext.runConfigurations
+import org.jetbrains.gradle.ext.settings

 plugins {
-    // Build
-    alias(libs.plugins.forgeGradle)
-    alias(libs.plugins.mixinGradle)
-    alias(libs.plugins.librarian)
-    alias(libs.plugins.shadow)
-    // Publishing
-    `maven-publish`
-    alias(libs.plugins.curseForgeGradle)
-    alias(libs.plugins.githubRelease)
-    alias(libs.plugins.minotaur)
-    // Utility
+    publishing
    alias(libs.plugins.taskTree)
-
-    id("cc-tweaked.illuaminate")
-    id("cc-tweaked.node")
-    id("cc-tweaked.gametest")
+    alias(libs.plugins.githubRelease)
+    id("org.jetbrains.gradle.plugin.idea-ext")
    id("cc-tweaked")
 }

-val isStable = true
+val isUnstable = project.properties["isUnstable"] == "true"
 val modVersion: String by extra
 val mcVersion: String by extra

-group = "org.squiddev"
-version = modVersion
-base.archivesName.set("cc-tweaked-$mcVersion")
-
-java.registerFeature("extraMods") { usingSourceSet(sourceSets.main.get()) }
-
-sourceSets {
-    main {
-        resources.srcDir("src/generated/resources")
-    }
-}
-
-minecraft {
-    runs {
-        // configureEach would be better, but we need to eagerly configure configs or otherwise the run task doesn't
-        // get set up properly.
-        all {
-            property("forge.logging.markers", "REGISTRIES")
-            property("forge.logging.console.level", "debug")
-
-            forceExit = false
-
-            mods.register("computercraft") { source(sourceSets.main.get()) }
-        }
-
-        val client by registering {
-            workingDirectory(file("run"))
-        }
-
-        val server by registering {
-            workingDirectory(file("run/server"))
-            arg("--nogui")
-        }
-
-        val data by registering {
-            workingDirectory(file("run"))
-            args(
-                "--mod",
-                "computercraft",
-                "--all",
-                "--output",
-                file("src/generated/resources/"),
-                "--existing",
-                file("src/main/resources/"),
-            )
-            property("cct.pretty-json", "true")
-        }
-
-        fun RunConfig.configureForGameTest() {
-            mods.register("cctest") {
-                source(sourceSets["testMod"])
-                source(sourceSets["testFixtures"])
-            }
-        }
-
-        val testClient by registering {
-            workingDirectory(file("run/testClient"))
-            parent(client.get())
-            configureForGameTest()
-        }
-
-        val testServer by registering {
-            workingDirectory(file("run/testServer"))
-            parent(server.get())
-            configureForGameTest()
-
-            property("cctest.run", "true")
-            property("forge.logging.console.level", "info")
-        }
-    }
-
-    mappings("parchment", "${libs.versions.parchmentMc.get()}-${libs.versions.parchment.get()}-$mcVersion")
-
-    accessTransformer(file("src/main/resources/META-INF/accesstransformer.cfg"))
-    accessTransformer(file("src/testMod/resources/META-INF/accesstransformer.cfg"))
-}
-
-mixin {
-    add(sourceSets.main.get(), "computercraft.mixins.refmap.json")
-    config("computercraft.mixins.json")
-}
-
-reobf {
-    register("shadowJar")
-}
-
-configurations {
-    val shade by registering { isTransitive = false }
-    implementation { extendsFrom(shade.get()) }
-    register("cctJavadoc")
-}
-
-dependencies {
-    minecraft("net.minecraftforge:forge:$mcVersion-${libs.versions.forge.get()}")
-    annotationProcessor("org.spongepowered:mixin:0.8.4:processor")
-
-    compileOnly(libs.jetbrainsAnnotations)
-    annotationProcessorEverywhere(libs.autoService)
-
-    "extraModsCompileOnly"(fg.deobf("mezz.jei:jei-1.16.5:7.7.0.104:api"))
-    "extraModsRuntimeOnly"(fg.deobf("mezz.jei:jei-1.16.5:7.7.0.104"))
-
-    "extraModsCompileOnly"(fg.deobf("com.blamejared.crafttweaker:CraftTweaker-1.16.5:7.1.0.313"))
-    "extraModsCompileOnly"(fg.deobf("commoble.morered:morered-1.16.5:2.1.1.0"))
-
-    "shade"(libs.cobalt)
-
-    testFixturesApi(libs.bundles.test)
-    testFixturesApi(libs.bundles.kotlin)
-
-    testImplementation(libs.bundles.test)
-    testImplementation(libs.bundles.kotlin)
-    testRuntimeOnly(libs.bundles.testRuntime)
-
-    "cctJavadoc"(libs.cctJavadoc)
-}
-
-illuaminate {
-    version.set(libs.versions.illuaminate)
-}
-
-// Compile tasks
-
-tasks.javadoc {
-    include("dan200/computercraft/api/**/*.java")
-    (options as StandardJavadocDocletOptions).links("https://docs.oracle.com/javase/8/docs/api/")
-}
-
-val apiJar by tasks.registering(Jar::class) {
-    archiveClassifier.set("api")
-    from(sourceSets.main.get().output) {
-        include("dan200/computercraft/api/**/*")
-    }
-}
-
-tasks.assemble { dependsOn(apiJar) }
-
-val luaJavadoc by tasks.registering(Javadoc::class) {
-    description = "Generates documentation for Java-side Lua functions."
-    group = JavaBasePlugin.DOCUMENTATION_GROUP
-
-    source(sourceSets.main.get().java)
-    setDestinationDir(buildDir.resolve("docs/luaJavadoc"))
-    classpath = sourceSets.main.get().compileClasspath
-
-    options.docletpath = configurations["cctJavadoc"].files.toList()
-    options.doclet = "cc.tweaked.javadoc.LuaDoclet"
-    (options as StandardJavadocDocletOptions).noTimestamp(false)
-
-    javadocTool.set(
-        javaToolchains.javadocToolFor {
-            languageVersion.set(JavaLanguageVersion.of(11))
-        },
-    )
-}
-
-tasks.processResources {
-    inputs.property("modVersion", modVersion)
-    inputs.property("forgeVersion", libs.versions.forge.get())
-    inputs.property("gitHash", cct.gitHash)
-
-    filesMatching("data/computercraft/lua/rom/help/credits.txt") {
-        expand(mapOf("gitContributors" to cct.gitContributors.get().joinToString("\n")))
-    }
-
-    filesMatching("META-INF/mods.toml") {
-        expand(mapOf("forgeVersion" to libs.versions.forge.get(), "file" to mapOf("jarVersion" to modVersion)))
-    }
-}
-
-tasks.jar {
-    isReproducibleFileOrder = true
-    isPreserveFileTimestamps = false
-    finalizedBy("reobfJar")
-    archiveClassifier.set("slim")
-
-    manifest {
-        attributes(
-            "Specification-Title" to "computercraft",
-            "Specification-Vendor" to "SquidDev",
-            "Specification-Version" to "1",
-            "Implementation-Title" to "cctweaked",
-            "Implementation-Version" to modVersion,
-            "Implementation-Vendor" to "SquidDev",
-        )
-    }
-}
-
-tasks.shadowJar {
-    finalizedBy("reobfShadowJar")
-
-    archiveClassifier.set("")
-    configurations = listOf(project.configurations["shade"])
-    relocate("org.squiddev.cobalt", "cc.tweaked.internal.cobalt")
-    minimize()
-}
-
-tasks.assemble { dependsOn("shadowJar") }
-
-// Web tasks
-
-val rollup by tasks.registering(NpxExecToDir::class) {
-    group = LifecycleBasePlugin.BUILD_GROUP
-    description = "Bundles JS into rollup"
-
-    // Sources
-    inputs.files(fileTree("src/web")).withPropertyName("sources")
-    // Config files
-    inputs.file("tsconfig.json").withPropertyName("Typescript config")
-    inputs.file("rollup.config.js").withPropertyName("Rollup config")
-
-    // Output directory. Also defined in illuaminate.sexp and rollup.config.js
-    output.set(buildDir.resolve("rollup"))
-
-    args = listOf("rollup", "--config", "rollup.config.js")
-}
-
-val illuaminateDocs by tasks.registering(IlluaminateExecToDir::class) {
-    group = JavaBasePlugin.DOCUMENTATION_GROUP
-    description = "Generates docs using Illuaminate"
-
-    // Config files
-    inputs.file("illuaminate.sexp").withPropertyName("illuaminate.sexp")
-    // Sources
-    inputs.files(fileTree("doc")).withPropertyName("docs")
-    inputs.files(fileTree("src/main/resources/data/computercraft/lua")).withPropertyName("lua rom")
-    inputs.files(luaJavadoc)
-    // Additional assets
-    inputs.files(rollup)
-    inputs.file("src/web/styles.css").withPropertyName("styles")
-
-    // Output directory. Also defined in illuaminate.sexp and transform.tsx
-    output.set(buildDir.resolve("illuaminate"))
-
-    args = listOf("doc-gen")
-}
-
-val jsxDocs by tasks.registering(NpxExecToDir::class) {
-    group = JavaBasePlugin.DOCUMENTATION_GROUP
-    description = "Post-processes documentation to statically render some dynamic content."
-
-    // Config files
-    inputs.file("tsconfig.json").withPropertyName("Typescript config")
-    // Sources
-    inputs.files(fileTree("src/web")).withPropertyName("sources")
-    inputs.file("src/generated/export/index.json").withPropertyName("export")
-    inputs.files(illuaminateDocs)
-
-    // Output directory. Also defined in src/web/transform.tsx
-    output.set(buildDir.resolve("jsxDocs"))
-
-    args = listOf("ts-node", "-T", "--esm", "src/web/transform.tsx")
-}
-
-val docWebsite by tasks.registering(Copy::class) {
-    group = JavaBasePlugin.DOCUMENTATION_GROUP
-    description = "Assemble docs and assets together into the documentation website."
-
-    from(jsxDocs)
-
-    from("doc") {
-        include("logo.png")
-        include("images/**")
-    }
-    from(rollup) { exclude("index.js") }
-    from(illuaminateDocs) { exclude("**/*.html") }
-    from("src/generated/export/items") { into("images/items") }
-
-    into(buildDir.resolve("docs/site"))
-}
-
-// Check tasks
-
-tasks.test {
-    systemProperty("cct.test-files", buildDir.resolve("tmp/testFiles").absolutePath)
-}
-
-val lintLua by tasks.registering(IlluaminateExec::class) {
-    group = JavaBasePlugin.VERIFICATION_GROUP
-    description = "Lint Lua (and Lua docs) with illuaminate"
-
-    // Config files
-    inputs.file("illuaminate.sexp").withPropertyName("illuaminate.sexp")
-    // Sources
-    inputs.files(fileTree("doc")).withPropertyName("docs")
-    inputs.files(fileTree("src/main/resources/data/computercraft/lua")).withPropertyName("lua rom")
-    inputs.files(luaJavadoc)
-
-    args = listOf("lint")
-
-    doFirst { if (System.getenv("GITHUB_ACTIONS") != null) println("::add-matcher::.github/matchers/illuaminate.json") }
-    doLast { if (System.getenv("GITHUB_ACTIONS") != null) println("::remove-matcher owner=illuaminate::") }
-}
-
-val setupRunGametest by tasks.registering(Copy::class) {
-    group = LifecycleBasePlugin.VERIFICATION_GROUP
-    description = "Sets up the environment for the test server."
-
-    from("src/testMod/server-files") {
-        include("eula.txt")
-        include("server.properties")
-    }
-    into("run/testServer")
-}
-
-val runGametest by tasks.registering(JavaExec::class) {
-    group = LifecycleBasePlugin.VERIFICATION_GROUP
-    description = "Runs tests on a temporary Minecraft instance."
-    dependsOn(setupRunGametest, "cleanRunGametest")
-
-    // Copy from runTestServer. We do it in this slightly odd way as runTestServer
-    // isn't created until the task is configured (which is no good for us).
-    val exec = tasks.getByName<JavaExec>("runTestServer")
-    dependsOn(exec.dependsOn)
-    exec.copyToFull(this)
-}
-
-cct.jacoco(runGametest)
-
-tasks.check { dependsOn(runGametest) }
-
-// Upload tasks
-
-val checkChangelog by tasks.registering(CheckChangelog::class) {
-    version.set(modVersion)
-    whatsNew.set(file("src/main/resources/data/computercraft/lua/rom/help/whatsnew.md"))
-    changelog.set(file("src/main/resources/data/computercraft/lua/rom/help/changelog.md"))
-}
-
-tasks.check { dependsOn(checkChangelog) }
-
-val publishCurseForge by tasks.registering(TaskPublishCurseForge::class) {
-    group = PublishingPlugin.PUBLISH_TASK_GROUP
-    description = "Upload artifacts to CurseForge"
-
-    apiToken = findProperty("curseForgeApiKey") ?: ""
-    enabled = apiToken != ""
-
-    val mainFile = upload("282001", tasks.shadowJar.get().archiveFile)
-    dependsOn(tasks.shadowJar) // Ughr.
-    mainFile.changelog = "Release notes can be found on the [GitHub repository](https://github.com/cc-tweaked/CC-Tweaked/releases/tag/v$mcVersion-$modVersion)."
-    mainFile.changelogType = "markdown"
-    mainFile.releaseType = if (isStable) "release" else "alpha"
-    mainFile.gameVersions.add(mcVersion)
-}
-
-tasks.publish { dependsOn(publishCurseForge) }
-
-modrinth {
-    token.set(findProperty("modrinthApiKey") as String? ?: "")
-    projectId.set("gu7yAYhd")
-    versionNumber.set("$mcVersion-$modVersion")
-    versionName.set(modVersion)
-    versionType.set(if (isStable) "release" else "alpha")
-    uploadFile.set(tasks.shadowJar as Any)
-    gameVersions.add(mcVersion)
-    changelog.set("Release notes can be found on the [GitHub repository](https://github.com/cc-tweaked/CC-Tweaked/releases/tag/v$mcVersion-$modVersion).")
-
-    syncBodyFrom.set(provider { file("doc/mod-page.md").readText() })
-}
-
-tasks.publish { dependsOn(tasks.modrinth) }
-
 githubRelease {
    token(findProperty("githubApiKey") as String? ?: "")
    owner.set("cc-tweaked")
@@ -399,54 +31,74 @@ githubRelease {
    releaseName.set("[$mcVersion] $modVersion")
    body.set(
        provider {
-            "## " + file("src/main/resources/data/computercraft/lua/rom/help/whatsnew.md")
+            "## " + project(":core").file("src/main/resources/data/computercraft/lua/rom/help/whatsnew.md")
                .readLines()
                .takeWhile { it != "Type \"help changelog\" to see the full version history." }
                .joinToString("\n").trim()
        },
    )
-    prerelease.set(!isStable)
+    prerelease.set(isUnstable)
 }

 tasks.publish { dependsOn(tasks.githubRelease) }

-publishing {
-    publications {
-        register<MavenPublication>("maven") {
-            artifactId = base.archivesName.get()
-            from(components["java"])
-            artifact(apiJar)
-            fg.component(this)
-
-            pom {
-                name.set("CC: Tweaked")
-                description.set("CC: Tweaked is a fork of ComputerCraft, adding programmable computers, turtles and more to Minecraft.")
-                url.set("https://github.com/cc-tweaked/CC-Tweaked")
-
-                scm {
-                    url.set("https://github.com/cc-tweaked/CC-Tweaked.git")
-                }
-
-                issueManagement {
-                    system.set("github")
-                    url.set("https://github.com/cc-tweaked/CC-Tweaked/issues")
-                }
-
-                licenses {
-                    license {
-                        name.set("ComputerCraft Public License, Version 1.0")
-                        url.set("https://github.com/cc-tweaked/CC-Tweaked/blob/HEAD/LICENSE")
-                    }
-                }
-            }
-        }
+idea.project.settings.runConfigurations {
+    register<JUnitExt>("Core Tests") {
+        vmParameters = "-ea"
+        moduleName = "${idea.project.name}.core.test"
+        packageName = ""
    }

-    repositories {
-        maven("https://squiddev.cc/maven") {
-            name = "SquidDev"
+    register<JUnitExt>("CraftOS Tests") {
+        vmParameters = "-ea"
+        moduleName = "${idea.project.name}.core.test"
+        className = "dan200.computercraft.core.ComputerTestDelegate"
+    }

-            credentials(PasswordCredentials::class)
-        }
+    register<JUnitExt>("CraftOS Tests (Fast)") {
+        vmParameters = "-ea -Dcc.skip_keywords=slow"
+        moduleName = "${idea.project.name}.core.test"
+        className = "dan200.computercraft.core.ComputerTestDelegate"
+    }
+
+    register<JUnitExt>("Common Tests") {
+        vmParameters = "-ea"
+        moduleName = "${idea.project.name}.common.test"
+        packageName = ""
+    }
+
+    register<JUnitExt>("Fabric Tests") {
+        val fabricProject = evaluationDependsOn(":fabric")
+        val classPathGroup = fabricProject.extensions.getByType<LoomGradleExtensionAPI>().mods
+            .joinToString(File.pathSeparator + File.pathSeparator) { modSettings ->
+                SourceSetHelper.getClasspath(modSettings, project).joinToString(File.pathSeparator) { it.absolutePath }
+            }
+
+        vmParameters = "-ea -Dfabric.classPathGroups=$classPathGroup"
+        moduleName = "${idea.project.name}.fabric.test"
+        packageName = ""
+    }
+
+    register<JUnitExt>("Forge Tests") {
+        vmParameters = "-ea"
+        moduleName = "${idea.project.name}.forge.test"
+        packageName = ""
    }
 }
+
+idea.project.settings.compiler.javac {
+    // We want ErrorProne to be present when compiling via IntelliJ, as it offers some helpful warnings
+    // and errors. Loop through our source sets and find the appropriate flags.
+    moduleJavacAdditionalOptions = subprojects
+        .asSequence()
+        .map { evaluationDependsOn(it.path) }
+        .flatMap { project ->
+            val sourceSets = project.extensions.findByType(SourceSetContainer::class) ?: return@flatMap sequenceOf()
+            sourceSets.asSequence().map { sourceSet ->
+                val name = "${idea.project.name}.${project.name}.${sourceSet.name}"
+                val compile = project.tasks.named(sourceSet.compileJavaTaskName, JavaCompile::class).get()
+                name to compile.options.allCompilerArgs.joinToString(" ") { if (it.contains(" ")) "\"$it\"" else it }
+            }
+        }
+        .toMap()
+}
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -1,16 +1,60 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 plugins {
    `java-gradle-plugin`
    `kotlin-dsl`
 }

+// Duplicated in settings.gradle.kts
 repositories {
    mavenCentral()
    gradlePluginPortal()
+
+    maven("https://maven.minecraftforge.net") {
+        name = "Forge"
+        content {
+            includeGroup("net.minecraftforge")
+            includeGroup("net.minecraftforge.gradle")
+        }
+    }
+
+    maven("https://maven.parchmentmc.org") {
+        name = "Librarian"
+        content {
+            includeGroupByRegex("^org\\.parchmentmc.*")
+        }
+    }
+
+    maven("https://repo.spongepowered.org/repository/maven-public/") {
+        name = "Sponge"
+        content {
+            includeGroup("org.spongepowered")
+        }
+    }
+
+    maven("https://maven.fabricmc.net/") {
+        name = "Fabric"
+        content {
+            includeGroup("net.fabricmc")
+        }
+    }
 }

 dependencies {
+    implementation(libs.errorProne.plugin)
    implementation(libs.kotlin.plugin)
    implementation(libs.spotless)
+
+    implementation(libs.curseForgeGradle)
+    implementation(libs.fabric.loom)
+    implementation(libs.forgeGradle)
+    implementation(libs.ideaExt)
+    implementation(libs.librarian)
+    implementation(libs.minotaur)
+    implementation(libs.vanillaGradle)
+    implementation(libs.vineflower)
 }

 gradlePlugin {
--- a/buildSrc/settings.gradle.kts
+++ b/buildSrc/settings.gradle.kts
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 dependencyResolutionManagement {
    versionCatalogs {
        create("libs") {
--- a/buildSrc/src/main/kotlin/cc-tweaked.fabric.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.fabric.gradle.kts
@@ -0,0 +1,70 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+/** Default configuration for Fabric projects. */
+
+import cc.tweaked.gradle.CCTweakedExtension
+import cc.tweaked.gradle.CCTweakedPlugin
+import cc.tweaked.gradle.IdeaRunConfigurations
+import cc.tweaked.gradle.MinecraftConfigurations
+
+plugins {
+    `java-library`
+    id("fabric-loom")
+    id("io.github.juuxel.loom-vineflower")
+    id("cc-tweaked.java-convention")
+}
+
+plugins.apply(CCTweakedPlugin::class.java)
+
+val mcVersion: String by extra
+
+repositories {
+    maven("https://maven.parchmentmc.org/") {
+        name = "Parchment"
+        content {
+            includeGroup("org.parchmentmc.data")
+        }
+    }
+}
+
+loom {
+    splitEnvironmentSourceSets()
+    splitModDependencies.set(true)
+}
+
+MinecraftConfigurations.setup(project)
+
+extensions.configure(CCTweakedExtension::class.java) {
+    linters(minecraft = true, loader = "fabric")
+}
+
+dependencies {
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+
+    minecraft("com.mojang:minecraft:$mcVersion")
+    mappings(
+        loom.layered {
+            officialMojangMappings()
+            parchment(
+                project.dependencies.create(
+                    group = "org.parchmentmc.data",
+                    name = "parchment-${libs.findVersion("parchmentMc").get()}",
+                    version = libs.findVersion("parchment").get().toString(),
+                    ext = "zip",
+                ),
+            )
+        },
+    )
+
+    modImplementation(libs.findLibrary("fabric-loader").get())
+    modImplementation(libs.findLibrary("fabric-api").get())
+
+    // Depend on error prone annotations to silence a lot of compile warnings.
+    compileOnlyApi(libs.findLibrary("errorProne.annotations").get())
+}
+
+tasks.ideaSyncTask {
+    doLast { IdeaRunConfigurations(project).patch() }
+}
--- a/buildSrc/src/main/kotlin/cc-tweaked.forge.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.forge.gradle.kts
@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+/** Default configuration for Forge projects. */
+
+import cc.tweaked.gradle.CCTweakedExtension
+import cc.tweaked.gradle.CCTweakedPlugin
+import cc.tweaked.gradle.IdeaRunConfigurations
+import cc.tweaked.gradle.MinecraftConfigurations
+
+plugins {
+    id("net.minecraftforge.gradle")
+    // We must apply java-convention after Forge, as we need the fg extension to be present.
+    id("cc-tweaked.java-convention")
+    id("org.parchmentmc.librarian.forgegradle")
+}
+
+plugins.apply(CCTweakedPlugin::class.java)
+
+val mcVersion: String by extra
+
+minecraft {
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+    mappings("parchment", "${libs.findVersion("parchmentMc").get()}-${libs.findVersion("parchment").get()}-$mcVersion")
+
+    accessTransformer(project(":forge").file("src/main/resources/META-INF/accesstransformer.cfg"))
+}
+
+MinecraftConfigurations.setup(project)
+
+extensions.configure(CCTweakedExtension::class.java) {
+    linters(minecraft = true, loader = "forge")
+}
+
+dependencies {
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+    "minecraft"("net.minecraftforge:forge:$mcVersion-${libs.findVersion("forge").get()}")
+}
+
+tasks.configureEach {
+    // genIntellijRuns isn't registered until much later, so we need this silly hijinks.
+    if (name == "genIntellijRuns") doLast { IdeaRunConfigurations(project).patch() }
+}
--- a/buildSrc/src/main/kotlin/cc-tweaked.gametest.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.gametest.gradle.kts
@@ -1,4 +1,9 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+import cc.tweaked.gradle.clientClasses
+import cc.tweaked.gradle.commonClasses

 /**
 * Sets up the configurations for writing game tests.
@@ -11,12 +16,13 @@ plugins {
    id("cc-tweaked.java-convention")
 }

-val main = sourceSets.main.get()
+val main = sourceSets["main"]
+val client = sourceSets["client"]

-// Both testMod and testFixtures inherit from the main classpath, just so we have access to Minecraft classes.
+// Both testMod and testFixtures inherit from the main and client classpath, just so we have access to Minecraft classes.
 val testMod by sourceSets.creating {
-    compileClasspath += main.compileClasspath
-    runtimeClasspath += main.runtimeClasspath
+    compileClasspath += main.compileClasspath + client.compileClasspath
+    runtimeClasspath += main.runtimeClasspath + client.runtimeClasspath
 }

 configurations {
@@ -32,12 +38,13 @@ configurations {
 // Like the main test configurations, we're safe to depend on source set outputs.
 dependencies {
    add(testMod.implementationConfigurationName, main.output)
+    add(testMod.implementationConfigurationName, client.output)
 }

 // Similar to java-test-fixtures, but tries to avoid putting the obfuscated jar on the classpath.

 val testFixtures by sourceSets.creating {
-    compileClasspath += main.compileClasspath
+    compileClasspath += main.compileClasspath + client.compileClasspath
 }

 java.registerFeature("testFixtures") {
@@ -46,8 +53,12 @@ java.registerFeature("testFixtures") {
 }

 dependencies {
-    add(testFixtures.implementationConfigurationName, main.output)
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+    add(testFixtures.apiConfigurationName, libs.findBundle("test").get())
+    // Consumers of this project already have the common and client classes on the classpath, so it's fine for these
+    // to be compile-only.
+    add(testFixtures.compileOnlyApiConfigurationName, commonClasses(project))
+    add(testFixtures.compileOnlyApiConfigurationName, clientClasses(project))

    testImplementation(testFixtures(project))
-    add(testMod.implementationConfigurationName, testFixtures(project))
 }
--- a/buildSrc/src/main/kotlin/cc-tweaked.java-convention.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.java-convention.gradle.kts
@@ -1,37 +1,74 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+import cc.tweaked.gradle.CCTweakedExtension
 import cc.tweaked.gradle.CCTweakedPlugin
-import cc.tweaked.gradle.LicenseHeader
 import com.diffplug.gradle.spotless.FormatExtension
 import com.diffplug.spotless.LineEnding
+import net.ltgt.gradle.errorprone.CheckSeverity
+import net.ltgt.gradle.errorprone.errorprone
 import java.nio.charset.StandardCharsets

 plugins {
    `java-library`
+    idea
    jacoco
    checkstyle
    id("com.diffplug.spotless")
+    id("net.ltgt.errorprone")
 }

+val modVersion: String by extra
+val mcVersion: String by extra
+
+group = "cc.tweaked"
+version = modVersion
+
+base.archivesName.convention("cc-tweaked-$mcVersion-${project.name}")
+
 java {
    toolchain {
        languageVersion.set(CCTweakedPlugin.JAVA_VERSION)
    }

    withSourcesJar()
-    withJavadocJar()
 }

 repositories {
    mavenCentral()
-    maven("https://squiddev.cc/maven") {
+
+    val mainMaven = maven("https://squiddev.cc/maven") {
        name = "SquidDev"
        content {
-            includeGroup("org.squiddev")
+            // Until https://github.com/SpongePowered/Mixin/pull/593 is merged
+            includeModule("org.spongepowered", "mixin")
+        }
+    }
+
+    exclusiveContent {
+        forRepositories(mainMaven)
+
+        // Include the ForgeGradle repository if present. This requires that ForgeGradle is already present, which we
+        // enforce in our Forge overlay.
+        val fg =
+            project.extensions.findByType(net.minecraftforge.gradle.userdev.DependencyManagementExtension::class.java)
+        if (fg != null) forRepositories(fg.repository)
+
+        filter {
            includeGroup("cc.tweaked")
+            includeModule("org.squiddev", "Cobalt")
            // Things we mirror
-            includeGroup("com.blamejared.crafttweaker")
            includeGroup("commoble.morered")
+            includeGroup("dev.architectury")
+            includeGroup("dev.emi")
            includeGroup("maven.modrinth")
+            includeGroup("me.shedaniel.cloth")
+            includeGroup("me.shedaniel")
            includeGroup("mezz.jei")
+            includeGroup("org.teavm")
+            includeModule("com.terraformersmc", "modmenu")
+            includeModule("me.lucko", "fabric-permissions-api")
        }
    }
 }
@@ -39,6 +76,9 @@ repositories {
 dependencies {
    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
    checkstyle(libs.findLibrary("checkstyle").get())
+
+    errorprone(libs.findLibrary("errorProne-core").get())
+    errorprone(libs.findLibrary("nullAway").get())
 }

 // Configure default JavaCompile tasks with our arguments.
@@ -46,13 +86,76 @@ sourceSets.all {
    tasks.named(compileJavaTaskName, JavaCompile::class.java) {
        // Processing just gives us "No processor claimed any of these annotations", so skip that!
        options.compilerArgs.addAll(listOf("-Xlint", "-Xlint:-processing"))
+
+        options.errorprone {
+            check("InvalidBlockTag", CheckSeverity.OFF) // Broken by @cc.xyz
+            check("InvalidParam", CheckSeverity.OFF) // Broken by records.
+            check("InlineMeSuggester", CheckSeverity.OFF) // Minecraft uses @Deprecated liberally
+            // Too many false positives right now. Maybe we need an indirection for it later on.
+            check("ReferenceEquality", CheckSeverity.OFF)
+            check("UnusedVariable", CheckSeverity.OFF) // Too many false positives with records.
+            check("OperatorPrecedence", CheckSeverity.OFF) // For now.
+            check("AlreadyChecked", CheckSeverity.OFF) // Seems to be broken?
+            check("NonOverridingEquals", CheckSeverity.OFF) // Peripheral.equals makes this hard to avoid
+            check("FutureReturnValueIgnored", CheckSeverity.OFF) // Too many false positives with Netty
+
+            check("NullAway", CheckSeverity.ERROR)
+            option(
+                "NullAway:AnnotatedPackages",
+                listOf("dan200.computercraft", "cc.tweaked", "net.fabricmc.fabric.api").joinToString(","),
+            )
+            option("NullAway:ExcludedFieldAnnotations", listOf("org.spongepowered.asm.mixin.Shadow").joinToString(","))
+            option("NullAway:CastToNonNullMethod", "dan200.computercraft.core.util.Nullability.assertNonNull")
+            option("NullAway:CheckOptionalEmptiness")
+            option("NullAway:AcknowledgeRestrictiveAnnotations")
+        }
    }
 }

+tasks.compileTestJava {
+    options.errorprone {
+        check("NullAway", CheckSeverity.OFF)
+    }
+}
+
+
 tasks.withType(JavaCompile::class.java).configureEach {
    options.encoding = "UTF-8"
 }

+tasks.processResources {
+    exclude("**/*.license")
+    exclude(".cache")
+}
+
+tasks.withType(AbstractArchiveTask::class.java).configureEach {
+    isPreserveFileTimestamps = false
+    isReproducibleFileOrder = true
+    dirMode = Integer.valueOf("755", 8)
+    fileMode = Integer.valueOf("664", 8)
+}
+
+tasks.jar {
+    manifest {
+        attributes(
+            "Specification-Title" to "computercraft",
+            "Specification-Vendor" to "SquidDev",
+            "Specification-Version" to "1",
+            "Implementation-Title" to "cctweaked-${project.name}",
+            "Implementation-Version" to modVersion,
+            "Implementation-Vendor" to "SquidDev",
+        )
+    }
+}
+
+tasks.javadoc {
+    options {
+        val stdOptions = this as StandardJavadocDocletOptions
+        stdOptions.addBooleanOption("Xdoclint:all,-missing", true)
+        stdOptions.links("https://docs.oracle.com/en/java/javase/17/docs/api/")
+    }
+}
+
 tasks.test {
    finalizedBy("jacocoTestReport")

@@ -67,6 +170,20 @@ tasks.withType(JacocoReport::class.java).configureEach {
    reports.html.required.set(true)
 }

+project.plugins.withType(CCTweakedPlugin::class.java) {
+    // Set up jacoco to read from /all/ our source directories.
+    val cct = project.extensions.getByType<CCTweakedExtension>()
+    project.tasks.named("jacocoTestReport", JacocoReport::class.java) {
+        for (ref in cct.sourceSets.get()) sourceDirectories.from(ref.allSource.sourceDirectories)
+    }
+}
+
+tasks.register("checkstyle") {
+    description = "Run Checkstyle on all sources"
+    group = LifecycleBasePlugin.VERIFICATION_GROUP
+    dependsOn(tasks.withType(Checkstyle::class.java))
+}
+
 spotless {
    encoding = StandardCharsets.UTF_8
    lineEndings = LineEnding.UNIX
@@ -77,19 +194,14 @@ spotless {
        indentWithSpaces(4)
    }

-    val licenser = LicenseHeader.create(
-        api = file("config/license/api.txt"),
-        main = file("config/license/main.txt"),
-    )
-
    java {
        defaults()
-        addStep(licenser)
        removeUnusedImports()
    }

    val ktlintConfig = mapOf(
-        "disabled_rules" to "no-wildcard-imports",
+        "ktlint_standard_no-wildcard-imports" to "disabled",
+        "ktlint_standard_class-naming" to "disabled",
        "ij_kotlin_allow_trailing_comma" to "true",
        "ij_kotlin_allow_trailing_comma_on_call_site" to "true",
    )
@@ -104,3 +216,12 @@ spotless {
        ktlint().editorConfigOverride(ktlintConfig)
    }
 }
+
+idea.module {
+    excludeDirs.addAll(project.files("run", "out", "logs").files)
+
+    // Force Gradle to write to inherit the output directory from the parent, instead of writing to out/xxx/classes.
+    // This is required for Loom, and we patch Forge's run configurations to work there.
+    // TODO: Submit a patch to Forge to support ProjectRootManager.
+    inheritOutputDirs = true
+}
--- a/buildSrc/src/main/kotlin/cc-tweaked.kotlin-convention.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.kotlin-convention.gradle.kts
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 import cc.tweaked.gradle.CCTweakedPlugin
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

--- a/buildSrc/src/main/kotlin/cc-tweaked.mod-publishing.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.mod-publishing.gradle.kts
@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+import net.darkhax.curseforgegradle.TaskPublishCurseForge
+import cc.tweaked.gradle.setProvider
+
+plugins {
+    id("net.darkhax.curseforgegradle")
+    id("com.modrinth.minotaur")
+    id("cc-tweaked.publishing")
+}
+
+abstract class ModPublishingExtension {
+    abstract val output: Property<AbstractArchiveTask>
+
+    init {
+        output.finalizeValueOnRead()
+    }
+}
+
+val modPublishing = project.extensions.create("modPublishing", ModPublishingExtension::class.java)
+
+val isUnstable = project.properties["isUnstable"] == "true"
+val modVersion: String by extra
+val mcVersion: String by extra
+
+val publishCurseForge by tasks.registering(TaskPublishCurseForge::class) {
+    group = PublishingPlugin.PUBLISH_TASK_GROUP
+    description = "Upload artifacts to CurseForge"
+
+    apiToken = findProperty("curseForgeApiKey") ?: ""
+    enabled = apiToken != ""
+
+    val mainFile = upload("282001", modPublishing.output.get().archiveFile)
+    mainFile.changelog =
+        "Release notes can be found on the [GitHub repository](https://github.com/cc-tweaked/CC-Tweaked/releases/tag/v$mcVersion-$modVersion)."
+    mainFile.changelogType = "markdown"
+    mainFile.releaseType = if (isUnstable) "alpha" else "release"
+    mainFile.gameVersions.add(mcVersion)
+}
+
+tasks.publish { dependsOn(publishCurseForge) }
+
+modrinth {
+    token.set(findProperty("modrinthApiKey") as String? ?: "")
+    projectId.set("gu7yAYhd")
+    versionNumber.set(modVersion)
+    versionName.set(modVersion)
+    versionType.set(if (isUnstable) "alpha" else "release")
+    uploadFile.setProvider(modPublishing.output)
+    gameVersions.add(mcVersion)
+    changelog.set("Release notes can be found on the [GitHub repository](https://github.com/cc-tweaked/CC-Tweaked/releases/tag/v$mcVersion-$modVersion).")
+
+    syncBodyFrom.set(provider { rootProject.file("doc/mod-page.md").readText() })
+}
+
+tasks.publish { dependsOn(tasks.modrinth) }
--- a/buildSrc/src/main/kotlin/cc-tweaked.publishing.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.publishing.gradle.kts
@@ -0,0 +1,47 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+plugins {
+    `java-library`
+    `maven-publish`
+}
+
+publishing {
+    publications {
+        register<MavenPublication>("maven") {
+            artifactId = base.archivesName.get()
+            from(components["java"])
+
+            pom {
+                name.set("CC: Tweaked")
+                description.set("CC: Tweaked is a fork of ComputerCraft, adding programmable computers, turtles and more to Minecraft.")
+                url.set("https://github.com/cc-tweaked/CC-Tweaked")
+
+                scm {
+                    url.set("https://github.com/cc-tweaked/CC-Tweaked.git")
+                }
+
+                issueManagement {
+                    system.set("github")
+                    url.set("https://github.com/cc-tweaked/CC-Tweaked/issues")
+                }
+
+                licenses {
+                    license {
+                        name.set("ComputerCraft Public License, Version 1.0")
+                        url.set("https://github.com/cc-tweaked/CC-Tweaked/blob/HEAD/LICENSE")
+                    }
+                }
+            }
+        }
+    }
+
+    repositories {
+        maven("https://squiddev.cc/maven") {
+            name = "SquidDev"
+
+            credentials(PasswordCredentials::class)
+        }
+    }
+}
--- a/buildSrc/src/main/kotlin/cc-tweaked.vanilla.gradle.kts
+++ b/buildSrc/src/main/kotlin/cc-tweaked.vanilla.gradle.kts
@@ -0,0 +1,35 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+/** Default configuration for non-modloader-specific Minecraft projects. */
+
+import cc.tweaked.gradle.CCTweakedExtension
+import cc.tweaked.gradle.CCTweakedPlugin
+import cc.tweaked.gradle.MinecraftConfigurations
+
+plugins {
+    id("cc-tweaked.java-convention")
+    id("org.spongepowered.gradle.vanilla")
+}
+
+plugins.apply(CCTweakedPlugin::class.java)
+
+val mcVersion: String by extra
+
+minecraft {
+    version(mcVersion)
+}
+
+dependencies {
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+
+    // Depend on error prone annotations to silence a lot of compile warnings.
+    compileOnlyApi(libs.findLibrary("errorProne.annotations").get())
+}
+
+MinecraftConfigurations.setup(project)
+
+extensions.configure(CCTweakedExtension::class.java) {
+    linters(minecraft = true, loader = null)
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedExtension.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedExtension.kt
@@ -1,23 +1,39 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

+import net.ltgt.gradle.errorprone.CheckSeverity
+import net.ltgt.gradle.errorprone.errorprone
+import org.gradle.api.GradleException
 import org.gradle.api.NamedDomainObjectProvider
 import org.gradle.api.Project
+import org.gradle.api.Task
 import org.gradle.api.attributes.TestSuiteType
 import org.gradle.api.file.FileSystemOperations
+import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.api.provider.Provider
+import org.gradle.api.provider.SetProperty
 import org.gradle.api.reporting.ReportingExtension
-import org.gradle.api.tasks.JavaExec
-import org.gradle.api.tasks.SourceSetContainer
+import org.gradle.api.tasks.SourceSet
+import org.gradle.api.tasks.bundling.Jar
+import org.gradle.api.tasks.compile.JavaCompile
+import org.gradle.api.tasks.javadoc.Javadoc
 import org.gradle.configurationcache.extensions.capitalized
-import org.gradle.kotlin.dsl.get
 import org.gradle.language.base.plugins.LifecycleBasePlugin
+import org.gradle.language.jvm.tasks.ProcessResources
+import org.gradle.process.JavaForkOptions
 import org.gradle.testing.jacoco.plugins.JacocoCoverageReport
 import org.gradle.testing.jacoco.plugins.JacocoPluginExtension
 import org.gradle.testing.jacoco.plugins.JacocoTaskExtension
 import org.gradle.testing.jacoco.tasks.JacocoReport
-import java.io.BufferedWriter
+import org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+import java.io.File
 import java.io.IOException
-import java.io.OutputStreamWriter
+import java.net.URI
+import java.net.URL
 import java.util.regex.Pattern

 abstract class CCTweakedExtension(
@@ -26,46 +42,138 @@ abstract class CCTweakedExtension(
 ) {
    /** Get the hash of the latest git commit. */
    val gitHash: Provider<String> = gitProvider(project, "<no git hash>") {
-        ProcessHelpers.captureOut("git", "-C", project.projectDir.absolutePath, "rev-parse", "HEAD").trim()
+        ProcessHelpers.captureOut("git", "-C", project.rootProject.projectDir.absolutePath, "rev-parse", "HEAD").trim()
    }

    /** Get the current git branch. */
    val gitBranch: Provider<String> = gitProvider(project, "<no git branch>") {
-        ProcessHelpers.captureOut("git", "-C", project.projectDir.absolutePath, "rev-parse", "--abbrev-ref", "HEAD").trim()
+        ProcessHelpers.captureOut("git", "-C", project.rootProject.projectDir.absolutePath, "rev-parse", "--abbrev-ref", "HEAD")
+            .trim()
    }

    /** Get a list of all contributors to the project. */
    val gitContributors: Provider<List<String>> = gitProvider(project, listOf()) {
-        val authors: Set<String> = HashSet(
-            ProcessHelpers.captureLines(
-                "git", "-C", project.projectDir.absolutePath, "log",
-                "--format=tformat:%an <%ae>%n%cn <%ce>%n%(trailers:key=Co-authored-by,valueonly)",
-            ),
+        ProcessHelpers.captureLines(
+            "git", "-C", project.rootProject.projectDir.absolutePath, "shortlog", "-ns",
+            "--group=author", "--group=trailer:co-authored-by", "HEAD",
        )
-        val process = ProcessHelpers.startProcess("git", "check-mailmap", "--stdin")
-        BufferedWriter(OutputStreamWriter(process.outputStream)).use { writer ->
-            for (authorName in authors) {
-                var author = authorName
-
-                if (author.isEmpty()) continue
-                if (!author.endsWith(">")) author += ">" // Some commits have broken Co-Authored-By lines!
-                writer.write(author)
-                writer.newLine()
+            .asSequence()
+            .map {
+                val matcher = COMMIT_COUNTS.matcher(it)
+                matcher.find()
+                matcher.group(1)
            }
-        }
-        val contributors: MutableSet<String> = HashSet()
-        for (authorLine in ProcessHelpers.captureLines(process)) {
-            val matcher = EMAIL.matcher(authorLine)
-            matcher.find()
-            val name = matcher.group(1)
-            if (!IGNORED_USERS.contains(name)) contributors.add(name)
-        }
-
-        contributors.sortedWith(String.CASE_INSENSITIVE_ORDER)
+            .filter { !IGNORED_USERS.contains(it) }
+            .toList()
+            .sortedWith(String.CASE_INSENSITIVE_ORDER)
    }

-    fun jacoco(task: NamedDomainObjectProvider<JavaExec>) {
-        val classDump = project.buildDir.resolve("jacocoClassDump/${task.name}")
+    /**
+     * References to other sources
+     */
+    val sourceDirectories: SetProperty<SourceSetReference> = project.objects.setProperty(SourceSetReference::class.java)
+
+    /** All source sets referenced by this project. */
+    val sourceSets = sourceDirectories.map { x -> x.map { it.sourceSet } }
+
+    init {
+        sourceDirectories.finalizeValueOnRead()
+        project.afterEvaluate { sourceDirectories.disallowChanges() }
+    }
+
+    /**
+     * Mark this project as consuming another project. Its [sourceDirectories] are added, allowing easier configuration
+     * of run configurations and other tasks which consume sources/classes.
+     */
+    fun externalSources(project: Project) {
+        val otherCct = project.extensions.getByType(CCTweakedExtension::class.java)
+        for (sourceSet in otherCct.sourceDirectories.get()) {
+            sourceDirectories.add(SourceSetReference(sourceSet.sourceSet, classes = sourceSet.classes, external = true))
+        }
+    }
+
+    /**
+     * Add a dependency on another project such that its sources and compiles are processed with this one.
+     *
+     * This is used when importing a common library into a loader-specific one, as we want to compile sources using
+     * the loader-specific sources.
+     */
+    fun inlineProject(path: String) {
+        val otherProject = project.evaluationDependsOn(path)
+        val otherJava = otherProject.extensions.getByType(JavaPluginExtension::class.java)
+        val main = otherJava.sourceSets.getByName("main")
+        val client = otherJava.sourceSets.getByName("client")
+        val testMod = otherJava.sourceSets.findByName("testMod")
+        val testFixtures = otherJava.sourceSets.findByName("testFixtures")
+
+        // Pull in sources from the other project.
+        extendSourceSet(otherProject, main)
+        extendSourceSet(otherProject, client)
+        if (testMod != null) extendSourceSet(otherProject, testMod)
+        if (testFixtures != null) extendSourceSet(otherProject, testFixtures)
+
+        // The extra source-processing tasks should include these files too.
+        project.tasks.named(main.javadocTaskName, Javadoc::class.java) { source(main.allJava, client.allJava) }
+        project.tasks.named(main.sourcesJarTaskName, Jar::class.java) { from(main.allSource, client.allSource) }
+        sourceDirectories.addAll(SourceSetReference.inline(main), SourceSetReference.inline(client))
+    }
+
+    /**
+     * Extend a source set with files from another project.
+     *
+     * This actually extends the original compile tasks, as extending the source sets does not play well with IDEs.
+     */
+    private fun extendSourceSet(otherProject: Project, sourceSet: SourceSet) {
+        project.tasks.named(sourceSet.compileJavaTaskName, JavaCompile::class.java) {
+            dependsOn(otherProject.tasks.named(sourceSet.compileJavaTaskName)) // Avoid duplicate compile errors
+            source(sourceSet.allJava)
+        }
+
+        project.tasks.named(sourceSet.processResourcesTaskName, ProcessResources::class.java) {
+            from(sourceSet.resources)
+        }
+
+        // Also try to depend on Kotlin if it exists
+        val kotlin = otherProject.extensions.findByType(KotlinProjectExtension::class.java)
+        if (kotlin != null) {
+            val compileKotlin = sourceSet.getCompileTaskName("kotlin")
+            project.tasks.named(compileKotlin, KotlinCompile::class.java) {
+                dependsOn(otherProject.tasks.named(compileKotlin))
+                source(kotlin.sourceSets.getByName(sourceSet.name).kotlin)
+            }
+        }
+
+        // If we're doing an IDE sync, add a fake dependency to ensure it's on the classpath.
+        if (isIdeSync) project.dependencies.add(sourceSet.apiConfigurationName, sourceSet.output)
+    }
+
+    fun linters(@Suppress("UNUSED_PARAMETER") vararg unused: UseNamedArgs, minecraft: Boolean, loader: String?) {
+        val java = project.extensions.getByType(JavaPluginExtension::class.java)
+        val sourceSets = java.sourceSets
+
+        project.dependencies.run { add("errorprone", project(mapOf("path" to ":lints"))) }
+        sourceSets.all {
+            val name = name
+            project.tasks.named(compileJavaTaskName, JavaCompile::class.java) {
+                options.errorprone {
+                    // Only the main source set should run the side checker
+                    check("SideChecker", if (minecraft && name == "main") CheckSeverity.DEFAULT else CheckSeverity.OFF)
+
+                    // The MissingLoaderOverride check superseeds the MissingOverride one, so disable that.
+                    if (loader != null) {
+                        check("MissingOverride", CheckSeverity.OFF)
+                        option("ModLoader", loader)
+                    } else {
+                        check("LoaderOverride", CheckSeverity.OFF)
+                        check("MissingLoaderOverride", CheckSeverity.OFF)
+                    }
+                }
+            }
+        }
+    }
+
+    fun <T> jacoco(task: NamedDomainObjectProvider<T>) where T : Task, T : JavaForkOptions {
+        val classDump = project.layout.buildDirectory.dir("jacocoClassDump/${task.name}")
        val reportTaskName = "jacoco${task.name.capitalized()}Report"

        val jacoco = project.extensions.getByType(JacocoPluginExtension::class.java)
@@ -77,7 +185,7 @@ abstract class CCTweakedExtension(
            jacoco.applyTo(this)
            extensions.configure(JacocoTaskExtension::class.java) {
                includes = listOf("dan200.computercraft.*")
-                classDumpDir = classDump
+                classDumpDir = classDump.get().asFile

                // Older versions of modlauncher don't include a protection domain (and thus no code
                // source). Jacoco skips such classes by default, so we need to explicitly include them.
@@ -93,8 +201,7 @@ abstract class CCTweakedExtension(
            classDirectories.from(classDump)

            // Don't want to use sourceSets(...) here as we have a custom class directory.
-            val sourceSets = project.extensions.getByType(SourceSetContainer::class.java)
-            sourceDirectories.from(sourceSets["main"].allSource.sourceDirectories)
+            for (ref in sourceSets.get()) sourceDirectories.from(ref.allSource.sourceDirectories)
        }

        project.extensions.configure(ReportingExtension::class.java) {
@@ -104,8 +211,43 @@ abstract class CCTweakedExtension(
        }
    }

+    /**
+     * Download a file by creating a dummy Ivy repository.
+     *
+     * This should only be used for one-off downloads. Using a more conventional Ivy or Maven repository is preferred
+     * where possible.
+     */
+    fun downloadFile(label: String, url: String): File {
+        val url = URL(url)
+        val path = File(url.path)
+
+        project.repositories.ivy {
+            name = label
+            setUrl(URI(url.protocol, url.userInfo, url.host, url.port, path.parent, null, null))
+            patternLayout {
+                artifact("[artifact].[ext]")
+            }
+            metadataSources {
+                artifact()
+            }
+            content {
+                includeModule("cc.tweaked.internal", path.nameWithoutExtension)
+            }
+        }
+
+        return project.configurations.detachedConfiguration(
+            project.dependencies.create(
+                mapOf(
+                    "group" to "cc.tweaked.internal",
+                    "name" to path.nameWithoutExtension,
+                    "ext" to path.extension,
+                ),
+            ),
+        ).resolve().single()
+    }
+
    companion object {
-        private val EMAIL = Pattern.compile("^([^<]+) <.+>$")
+        private val COMMIT_COUNTS = Pattern.compile("""^\s*[0-9]+\s+(.*)$""")
        private val IGNORED_USERS = setOf(
            "GitHub", "Daniel Ratcliffe", "Weblate",
        )
@@ -117,8 +259,14 @@ abstract class CCTweakedExtension(
                } catch (e: IOException) {
                    project.logger.error("Cannot read Git repository: ${e.message}")
                    default
+                } catch (e: GradleException) {
+                    project.logger.error("Cannot read Git repository: ${e.message}")
+                    default
                }
            }
        }
+
+        private val isIdeSync: Boolean
+            get() = java.lang.Boolean.parseBoolean(System.getProperty("idea.sync.active", "false"))
    }
 }
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedPlugin.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedPlugin.kt
@@ -1,18 +1,47 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.gradle.api.Plugin
 import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPlugin
+import org.gradle.api.plugins.JavaPluginExtension
 import org.gradle.jvm.toolchain.JavaLanguageVersion
+import org.gradle.plugins.ide.idea.model.IdeaModel
+import org.jetbrains.gradle.ext.IdeaExtPlugin
+import org.jetbrains.gradle.ext.runConfigurations
+import org.jetbrains.gradle.ext.settings

 /**
 * Configures projects to match a shared configuration.
 */
 class CCTweakedPlugin : Plugin<Project> {
    override fun apply(project: Project) {
-        project.extensions.create("cct", CCTweakedExtension::class.java)
+        val cct = project.extensions.create("cct", CCTweakedExtension::class.java)
+
+        project.plugins.withType(JavaPlugin::class.java) {
+            val sourceSets = project.extensions.getByType(JavaPluginExtension::class.java).sourceSets
+            cct.sourceDirectories.add(SourceSetReference.internal(sourceSets.getByName("main")))
+        }
+
+        project.plugins.withType(IdeaExtPlugin::class.java) { extendIdea(project) }
+    }
+
+    /**
+     * Extend the [IdeaExtPlugin] plugin's `runConfiguration` container to also support [JUnitExt].
+     */
+    private fun extendIdea(project: Project) {
+        val ideaModel = project.extensions.findByName("idea") as IdeaModel? ?: return
+        val ideaProject = ideaModel.project ?: return
+
+        ideaProject.settings.runConfigurations {
+            registerFactory(JUnitExt::class.java) { name -> project.objects.newInstance(JUnitExt::class.java, name) }
+        }
    }

    companion object {
-        val JAVA_VERSION = JavaLanguageVersion.of(8)
+        val JAVA_VERSION = JavaLanguageVersion.of(17)
    }
 }
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/CheckChangelog.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/CheckChangelog.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.gradle.api.DefaultTask
@@ -6,7 +10,6 @@ import org.gradle.api.file.RegularFileProperty
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.*
 import org.gradle.language.base.plugins.LifecycleBasePlugin
-import java.nio.charset.StandardCharsets

 /**
 * Checks the `changelog.md` and `whatsnew.md` files are well-formed.
@@ -35,7 +38,7 @@ abstract class CheckChangelog : DefaultTask() {

        var ok = true

-        // Check we're targetting the current version
+        // Check we're targeting the current version
        var whatsNew = whatsNew.get().asFile.readLines()
        if (whatsNew[0] != "New features in CC: Tweaked $version") {
            ok = false
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/CheckLicense.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/CheckLicense.kt
@@ -1,73 +0,0 @@
-package cc.tweaked.gradle
-
-import com.diffplug.spotless.FormatterFunc
-import com.diffplug.spotless.FormatterStep
-import com.diffplug.spotless.generic.LicenseHeaderStep
-import java.io.File
-import java.io.Serializable
-import java.nio.charset.StandardCharsets
-
-/**
- * Similar to [LicenseHeaderStep], but supports multiple licenses.
- */
-object LicenseHeader {
-    /**
-     * The current year to use in templates. Intentionally not dynamic to avoid failing the build.
-     */
-    private const val YEAR = 2022
-
-    private val COMMENT = Regex("""^/\*(.*?)\*/\n?""", RegexOption.DOT_MATCHES_ALL)
-
-    fun create(api: File, main: File): FormatterStep = FormatterStep.createLazy(
-        "license",
-        { Licenses(getTemplateText(api), getTemplateText(main)) },
-        { state -> FormatterFunc.NeedsFile { contents, file -> formatFile(state, contents, file) } },
-    )
-
-    private fun getTemplateText(file: File): String =
-        file.readText().trim().replace("\${year}", "$YEAR")
-
-    private fun formatFile(licenses: Licenses, contents: String, file: File): String {
-        val license = getLicense(contents)
-        val expectedLicense = getExpectedLicense(licenses, file.parentFile)
-
-        return when {
-            license == null -> setLicense(expectedLicense, contents)
-            license.second != expectedLicense -> setLicense(expectedLicense, contents, license.first)
-            else -> contents
-        }
-    }
-
-    private fun getExpectedLicense(licenses: Licenses, root: File): String {
-        var file: File? = root
-        while (file != null) {
-            if (file.name == "api" && file.parentFile?.name == "computercraft") return licenses.api
-            file = file.parentFile
-        }
-        return licenses.main
-    }
-
-    private fun getLicense(contents: String): Pair<Int, String>? {
-        val match = COMMENT.find(contents) ?: return null
-        val license = match.groups[1]!!.value
-            .trim().lineSequence()
-            .map { it.trimStart(' ', '*') }
-            .joinToString("\n")
-        return Pair(match.range.last + 1, license)
-    }
-
-    private fun setLicense(license: String, contents: String, start: Int = 0): String {
-        val out = StringBuilder()
-        out.append("/*\n")
-        for (line in license.lineSequence()) out.append(" * ").append(line).append("\n")
-        out.append(" */\n")
-        out.append(contents, start, contents.length)
-        return out.toString()
-    }
-
-    private data class Licenses(val api: String, val main: String) : Serializable {
-        companion object {
-            private const val serialVersionUID: Long = 7741106448372435662L
-        }
-    }
-}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/ExecTasks.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/ExecTasks.kt
@@ -1,5 +1,10 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

+import org.gradle.api.file.DirectoryProperty
 import org.gradle.api.provider.Property
 import org.gradle.api.tasks.AbstractExecTask
 import org.gradle.api.tasks.OutputDirectory
@@ -7,5 +12,5 @@ import java.io.File

 abstract class ExecToDir : AbstractExecTask<ExecToDir>(ExecToDir::class.java) {
    @get:OutputDirectory
-    abstract val output: Property<File>
+    abstract val output: DirectoryProperty
 }
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/Extensions.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/Extensions.kt
@@ -1,20 +1,131 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.gradle.api.artifacts.dsl.DependencyHandler
+import org.gradle.api.file.FileSystemLocation
+import org.gradle.api.file.FileSystemLocationProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.provider.Provider
 import org.gradle.api.tasks.JavaExec
+import org.gradle.process.BaseExecSpec
+import org.gradle.process.JavaExecSpec
+import org.gradle.process.ProcessForkOptions

+/**
+ * Add an annotation processor to all source sets.
+ */
 fun DependencyHandler.annotationProcessorEverywhere(dep: Any) {
    add("compileOnly", dep)
    add("annotationProcessor", dep)

+    add("clientCompileOnly", dep)
+    add("clientAnnotationProcessor", dep)
+
    add("testCompileOnly", dep)
    add("testAnnotationProcessor", dep)
 }

+/**
+ * A version of [JavaExecSpec.copyTo] which copies *all* properties.
+ */
 fun JavaExec.copyToFull(spec: JavaExec) {
    copyTo(spec)
-    spec.classpath = classpath
-    spec.mainClass.set(mainClass)
-    spec.javaLauncher.set(javaLauncher)
+
+    // Additional Java options
+    spec.jvmArgs = jvmArgs // Fabric overrides getJvmArgs so copyTo doesn't do the right thing.
    spec.args = args
+    spec.argumentProviders.addAll(argumentProviders)
+    spec.mainClass.set(mainClass)
+    spec.classpath = classpath
+    spec.javaLauncher.set(javaLauncher)
+    if (executable != null) spec.setExecutable(executable!!)
+
+    // Additional ExecSpec options
+    copyToExec(spec)
 }
+
+/**
+ * Copy additional [BaseExecSpec] options which aren't handled by [ProcessForkOptions.copyTo].
+ */
+fun BaseExecSpec.copyToExec(spec: BaseExecSpec) {
+    spec.isIgnoreExitValue = isIgnoreExitValue
+    if (standardInput != null) spec.standardInput = standardInput
+    if (standardOutput != null) spec.standardOutput = standardOutput
+    if (errorOutput != null) spec.errorOutput = errorOutput
+}
+
+/**
+ * An alternative to [Nothing] with a more descriptive name. Use to enforce calling a function with named arguments:
+ *
+ * ```kotlin
+ * fun f(vararg unused: UseNamedArgs, arg1: Int, arg2: Int) {
+ *   // ...
+ * }
+ * ```
+ */
+class UseNamedArgs private constructor()
+
+/**
+ * An [AutoCloseable] implementation which can be used to combine other [AutoCloseable] instances.
+ *
+ * Values which implement [AutoCloseable] can be dynamically registered with [CloseScope.add]. When the scope is closed,
+ * each value is closed in the opposite order.
+ *
+ * This is largely intended for cases where it's not appropriate to nest [AutoCloseable.use], for instance when nested
+ * would be too deep.
+ */
+class CloseScope : AutoCloseable {
+    private val toClose = ArrayDeque<AutoCloseable>()
+
+    /**
+     * Add a value to be closed when this scope is closed.
+     */
+    public fun add(value: AutoCloseable) {
+        toClose.addLast(value)
+    }
+
+    override fun close() {
+        close(null)
+    }
+
+    @PublishedApi
+    internal fun close(baseException: Throwable?) {
+        var exception = baseException
+
+        while (true) {
+            var toClose = toClose.removeLastOrNull() ?: break
+            try {
+                toClose.close()
+            } catch (e: Throwable) {
+                if (exception == null) {
+                    exception = e
+                } else {
+                    exception.addSuppressed(e)
+                }
+            }
+        }
+
+        if (exception != null) throw exception
+    }
+
+    inline fun <R> use(block: (CloseScope) -> R): R {
+        var exception: Throwable? = null
+        try {
+            return block(this)
+        } catch (e: Throwable) {
+            exception = e
+            throw e
+        } finally {
+            close(exception)
+        }
+    }
+}
+
+/** Proxy method to avoid overload ambiguity. */
+fun <T> Property<T>.setProvider(provider: Provider<out T>) = set(provider)
+
+/** Short-cut method to get the absolute path of a [FileSystemLocation] provider. */
+fun Provider<out FileSystemLocation>.getAbsolutePath(): String = get().asFile.absolutePath
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/ForgeExtensions.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/ForgeExtensions.kt
@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import net.minecraftforge.gradle.common.util.RunConfig
+import net.minecraftforge.gradle.common.util.runs.setRunConfigInternal
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.tasks.JavaExec
+import org.gradle.jvm.toolchain.JavaToolchainService
+import java.nio.file.Files
+
+/**
+ * Set [JavaExec] task to run a given [RunConfig].
+ */
+fun JavaExec.setRunConfig(config: RunConfig) {
+    dependsOn("prepareRuns")
+    setRunConfigInternal(project, this, config)
+    doFirst("Create working directory") { Files.createDirectories(workingDir.toPath()) }
+
+    javaLauncher.set(
+        project.extensions.getByType(JavaToolchainService::class.java)
+            .launcherFor(project.extensions.getByType(JavaPluginExtension::class.java).toolchain),
+    )
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/IdeaExt.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/IdeaExt.kt
@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import org.jetbrains.gradle.ext.JUnit
+import javax.inject.Inject
+
+/**
+ * A version of [JUnit] with a functional [className].
+ *
+ * See [#92](https://github.com/JetBrains/gradle-idea-ext-plugin/issues/92).
+ */
+open class JUnitExt @Inject constructor(nameParam: String) : JUnit(nameParam) {
+    override fun toMap(): MutableMap<String, *> {
+        val map = HashMap(super.toMap())
+        // Should be "class" instead of "className".
+        // See https://github.com/JetBrains/intellij-community/blob/9ba394021dc73a3926f13d6d6cdf434f9ee7046d/plugins/junit/src/com/intellij/execution/junit/JUnitRunConfigurationImporter.kt#L39
+        map["class"] = className
+        return map
+    }
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/IdeaRunConfigurations.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/IdeaRunConfigurations.kt
@@ -0,0 +1,174 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import org.gradle.api.Project
+import org.gradle.api.logging.Logging
+import org.w3c.dom.Attr
+import org.w3c.dom.Document
+import org.w3c.dom.Node
+import org.xml.sax.InputSource
+import java.nio.file.Files
+import java.nio.file.Path
+import javax.xml.parsers.DocumentBuilderFactory
+import javax.xml.transform.TransformerFactory
+import javax.xml.transform.dom.DOMSource
+import javax.xml.transform.stream.StreamResult
+import javax.xml.xpath.XPathConstants
+import javax.xml.xpath.XPathFactory
+
+/**
+ * Patches up run configurations from ForgeGradle and Loom.
+ *
+ * Would be good to PR some (or all) of these changes upstream at some point.
+ *
+ * @see net.fabricmc.loom.configuration.ide.idea.IdeaSyncTask
+ * @see net.minecraftforge.gradle.common.util.runs.IntellijRunGenerator
+ */
+internal class IdeaRunConfigurations(project: Project) {
+    private val rootProject = project.rootProject
+
+    private val documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder()
+    private val xpath = XPathFactory.newInstance().newXPath()
+    private val writer = TransformerFactory.newInstance().newTransformer()
+
+    private val ideaDir = rootProject.file(".idea/")
+    private val buildDir: Lazy<String?> = lazy {
+        val ideaMisc = ideaDir.resolve("misc.xml")
+
+        try {
+            val doc = Files.newBufferedReader(ideaMisc.toPath()).use {
+                documentBuilder.parse(InputSource(it))
+            }
+            val node =
+                xpath.evaluate("//component[@name=\"ProjectRootManager\"]/output", doc, XPathConstants.NODE) as Node
+            val attr = node.attributes.getNamedItem("url") as Attr
+            attr.value.removePrefix("file://")
+        } catch (e: Exception) {
+            LOGGER.error("Failed to find root directory", e)
+            null
+        }
+    }
+
+    fun patch() = synchronized(LOCK) {
+        val runConfigDir = ideaDir.resolve("runConfigurations")
+        if (!runConfigDir.isDirectory) return
+
+        Files.list(runConfigDir.toPath()).use {
+            for (configuration in it) {
+                val filename = configuration.fileName.toString();
+                when {
+                    filename.endsWith("_fabric.xml") -> patchFabric(configuration)
+                    filename.startsWith("forge_") && filename.endsWith(".xml") -> patchForge(configuration)
+                    else -> {}
+                }
+            }
+        }
+    }
+
+    private fun patchFabric(path: Path) = withXml(path) {
+        setXml("//configuration", "folderName") { "Fabric" }
+    }
+
+    private fun patchForge(path: Path) = withXml(path) {
+        val configId = path.fileName.toString().removePrefix("forge_").removeSuffix(".xml")
+        val sourceSet = forgeConfigs[configId]
+        if (sourceSet == null) {
+            LOGGER.error("[{}] Cannot map run configuration to a known source set", path)
+            return@withXml
+        }
+
+        setXml("//configuration", "folderName") { "Forge" }
+        setXml("//configuration/module", "name") { "${rootProject.name}.forge.$sourceSet" }
+
+        if (buildDir.value == null) return@withXml
+        setXml("//configuration/envs/env[@name=\"MOD_CLASSES\"]", "value") { classpath ->
+            val classes = classpath!!.split(':')
+            val newClasses = mutableListOf<String>()
+            fun appendUnique(x: String) {
+                if (!newClasses.contains(x)) newClasses.add(x)
+            }
+
+            for (entry in classes) {
+                if (!entry.contains("/out/")) {
+                    appendUnique(entry)
+                    continue
+                }
+
+                val match = CLASSPATH_ENTRY.matchEntire(entry)
+                if (match != null) {
+                    val modId = match.groups["modId"]!!.value
+                    val proj = match.groups["proj"]!!.value
+                    var component = match.groups["component"]!!.value
+                    if (component == "production") component = "main"
+
+                    appendUnique(forgeModEntry(modId, proj, component))
+                } else {
+                    LOGGER.warn("[{}] Unknown classpath entry {}", path, entry)
+                    appendUnique(entry)
+                }
+            }
+
+            // Ensure common code is on the classpath
+            for (proj in listOf("common", "common-api")) {
+                for (component in listOf("main", "client")) {
+                    appendUnique(forgeModEntry("computercraft", proj, component))
+                }
+            }
+
+            if (newClasses.any { it.startsWith("cctest%%") }) {
+                appendUnique(forgeModEntry("cctest", "core", "testFixtures"))
+                appendUnique(forgeModEntry("cctest", "common", "testFixtures"))
+                appendUnique(forgeModEntry("cctest", "common", "testMod"))
+            }
+
+            newClasses.joinToString(":")
+        }
+    }
+
+    private fun forgeModEntry(mod: String, project: String, component: String) =
+        "$mod%%${buildDir.value}/production/${rootProject.name}.$project.$component"
+
+    private fun LocatedDocument.setXml(xpath: String, attribute: String, value: (String?) -> String) {
+        val node = this@IdeaRunConfigurations.xpath.evaluate(xpath, document, XPathConstants.NODE) as Node?
+        if (node == null) {
+            LOGGER.error("[{}] Cannot find {}", path.fileName, xpath)
+            return
+        }
+
+        val attr = node.attributes.getNamedItem(attribute) as Attr? ?: document.createAttribute(attribute)
+        val oldValue = attr.value
+        attr.value = value(attr.value)
+        node.attributes.setNamedItem(attr)
+
+        if (oldValue != attr.value) {
+            LOGGER.info("[{}] Setting {}@{}:\n  Old: {}\n  New: {}", path.fileName, xpath, attribute, oldValue, attr.value)
+        }
+    }
+
+    private fun withXml(path: Path, run: LocatedDocument.() -> Unit) {
+        val doc = Files.newBufferedReader(path).use { documentBuilder.parse(InputSource(it)) }
+        run(LocatedDocument(path, doc))
+        Files.newBufferedWriter(path).use { writer.transform(DOMSource(doc), StreamResult(it)) }
+    }
+
+    private class LocatedDocument(val path: Path, val document: Document)
+
+    companion object {
+        private val LOGGER = Logging.getLogger(IdeaRunConfigurations::class.java)
+        private val LOCK = Any()
+
+        private val CLASSPATH_ENTRY =
+            Regex("(?<modId>[a-z]+)%%\\\$PROJECT_DIR\\\$/projects/(?<proj>[a-z-]+)/out/(?<component>\\w+)/(?<type>[a-z]+)\$")
+
+        private val forgeConfigs = mapOf(
+            "runClient" to "client",
+            "runData" to "main",
+            "runGameTestServer" to "testMod",
+            "runServer" to "main",
+            "runTestClient" to "testMod",
+        )
+    }
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/Illuaminate.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/Illuaminate.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.gradle.api.DefaultTask
@@ -56,7 +60,7 @@ class IlluaminatePlugin : Plugin<Project> {

    /** Define a dependency for illuaminate from a version number and the current operating system. */
    private fun illuaminateArtifact(project: Project, version: String): Dependency {
-        val osName = System.getProperty("os.name").toLowerCase()
+        val osName = System.getProperty("os.name").lowercase()
        val (os, suffix) = when {
            osName.contains("windows") -> Pair("windows", ".exe")
            osName.contains("mac os") || osName.contains("darwin") -> Pair("macos", "")
@@ -64,11 +68,13 @@ class IlluaminatePlugin : Plugin<Project> {
            else -> error("Unsupported OS $osName for illuaminate")
        }

-        val osArch = System.getProperty("os.arch").toLowerCase()
+        val osArch = System.getProperty("os.arch").lowercase()
        val arch = when {
+            // On macOS the x86_64 binary will work for both ARM and Intel Macs through Rosetta.
+            os == "macos" -> "x86_64"
            osArch == "arm" || osArch.startsWith("aarch") -> error("Unsupported architecture '$osArch' for illuaminate")
            osArch.contains("64") -> "x86_64"
-            else -> error("Unsupported architecture $osArch for illuaminate")
+            else -> error("Unsupported architecture '$osArch' for illuaminate")
        }

        return project.dependencies.create(
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/MavenDependencySpec.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/MavenDependencySpec.kt
@@ -0,0 +1,66 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import org.gradle.api.artifacts.Dependency
+import org.gradle.api.artifacts.MinimalExternalModuleDependency
+import org.gradle.api.publish.maven.MavenPublication
+import org.gradle.api.specs.Spec
+
+/**
+ * A dependency in a POM file.
+ */
+data class MavenDependency(val groupId: String?, val artifactId: String?, val version: String?, val scope: String?)
+
+/**
+ * A spec specifying which dependencies to include/exclude.
+ */
+class MavenDependencySpec {
+    private val excludeSpecs = mutableListOf<Spec<MavenDependency>>()
+
+    fun exclude(spec: Spec<MavenDependency>) {
+        excludeSpecs.add(spec)
+    }
+
+    fun exclude(dep: Dependency) {
+        exclude {
+            (dep.group.isNullOrEmpty() || dep.group == it.groupId) &&
+                (dep.name.isNullOrEmpty() || dep.name == it.artifactId) &&
+                (dep.version.isNullOrEmpty() || dep.version == it.version)
+        }
+    }
+
+    fun exclude(dep: MinimalExternalModuleDependency) {
+        exclude {
+            dep.module.group == it.groupId && dep.module.name == it.artifactId
+        }
+    }
+
+    fun isIncluded(dep: MavenDependency) = !excludeSpecs.any { it.isSatisfiedBy(dep) }
+}
+
+/**
+ * Configure dependencies present in this publication's POM file.
+ *
+ * While this approach is very ugly, it's the easiest way to handle it!
+ */
+fun MavenPublication.mavenDependencies(action: MavenDependencySpec.() -> Unit) {
+    val spec = MavenDependencySpec()
+    action(spec)
+
+    pom.withXml {
+        val dependencies = XmlUtil.findChild(asNode(), "dependencies") ?: return@withXml
+        dependencies.children().map { it as groovy.util.Node }.forEach {
+            val dep = MavenDependency(
+                groupId = XmlUtil.findChild(it, "groupId")?.text(),
+                artifactId = XmlUtil.findChild(it, "artifactId")?.text(),
+                version = XmlUtil.findChild(it, "version")?.text(),
+                scope = XmlUtil.findChild(it, "scope")?.text(),
+            )
+
+            if (!spec.isIncluded(dep)) it.parent().remove(it)
+        }
+    }
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftConfigurations.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftConfigurations.kt
@@ -0,0 +1,193 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import org.gradle.api.Project
+import org.gradle.api.artifacts.Configuration
+import org.gradle.api.artifacts.ModuleDependency
+import org.gradle.api.artifacts.dsl.DependencyHandler
+import org.gradle.api.attributes.Bundling
+import org.gradle.api.attributes.Category
+import org.gradle.api.attributes.LibraryElements
+import org.gradle.api.attributes.Usage
+import org.gradle.api.attributes.java.TargetJvmVersion
+import org.gradle.api.capabilities.Capability
+import org.gradle.api.plugins.BasePlugin
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.tasks.SourceSet
+import org.gradle.api.tasks.bundling.Jar
+import org.gradle.api.tasks.javadoc.Javadoc
+import org.gradle.kotlin.dsl.get
+import org.gradle.kotlin.dsl.named
+
+/**
+ * This sets up a separate client-only source set, and extends that and the main/common source set with additional
+ * metadata, to make it easier to consume jars downstream.
+ */
+class MinecraftConfigurations private constructor(private val project: Project) {
+    private val java = project.extensions.getByType(JavaPluginExtension::class.java)
+    private val sourceSets = java.sourceSets
+    private val configurations = project.configurations
+    private val objects = project.objects
+
+    private val main = sourceSets[SourceSet.MAIN_SOURCE_SET_NAME]
+    private val test = sourceSets[SourceSet.TEST_SOURCE_SET_NAME]
+
+    /**
+     * Performs the initial setup of our configurations.
+     */
+    private fun setup() {
+        // Define a client source set.
+        val client = sourceSets.maybeCreate("client")
+
+        // Ensure the client classpaths behave the same as the main ones.
+        configurations.named(client.compileClasspathConfigurationName) {
+            shouldResolveConsistentlyWith(configurations[main.compileClasspathConfigurationName])
+        }
+
+        configurations.named(client.runtimeClasspathConfigurationName) {
+            shouldResolveConsistentlyWith(configurations[main.runtimeClasspathConfigurationName])
+        }
+
+        // Set up an API configuration for clients (to ensure it's consistent with the main source set).
+        val clientApi = configurations.maybeCreate(client.apiConfigurationName).apply {
+            isVisible = false
+            isCanBeConsumed = false
+            isCanBeResolved = false
+        }
+        configurations.named(client.implementationConfigurationName) { extendsFrom(clientApi) }
+
+        /*
+          Now add outgoing variants for the main and common source sets that we can consume downstream. This is possibly
+          the worst way to do things, but unfortunately the alternatives don't actually work very well:
+
+           - Just using source set outputs: This means dependencies don't propagate, which means when :fabric depends
+             on :fabric-api, we don't inherit the fake :common-api in IDEA.
+
+           - Having separate common/main jars: Nice in principle, but unfortunately Forge needs a separate deobf jar
+             task (as the original jar is obfuscated), and IDEA is not able to map its output back to a source set.
+
+          This works for now, but is incredibly brittle. It's part of the reason we can't use testFixtures inside our
+          MC projects, as that adds a project(self) -> test dependency, which would pull in the jar instead.
+
+          Note we register a fake client jar here. It's not actually needed, but is there to make sure IDEA has
+          a way to tell that client classes are needed at runtime.
+
+          I'm so sorry, deeply aware how cursed this is.
+        */
+        setupOutgoing(main, "CommonOnly")
+        project.tasks.register(client.jarTaskName, Jar::class.java) {
+            description = "An empty jar standing in for the client classes."
+            group = BasePlugin.BUILD_GROUP
+            archiveClassifier.set("client")
+        }
+        setupOutgoing(client)
+
+        // Reset the client classpath (Loom configures it slightly differently to this) and add a main -> client
+        // dependency. Here we /can/ use source set outputs as we add transitive deps by patching the classpath. Nasty,
+        // but avoids accidentally pulling in Forge's obfuscated jar.
+        client.compileClasspath = client.compileClasspath + main.compileClasspath
+        client.runtimeClasspath = client.runtimeClasspath + main.runtimeClasspath
+        project.dependencies.add(client.apiConfigurationName, main.output)
+
+        // Also add client classes to the test classpath. We do the same nasty tricks as needed for main -> client.
+        test.compileClasspath += client.compileClasspath
+        test.runtimeClasspath += client.runtimeClasspath
+        project.dependencies.add(test.implementationConfigurationName, client.output)
+
+        // Configure some tasks to include our additional files.
+        project.tasks.named("javadoc", Javadoc::class.java) {
+            source(client.allJava)
+            classpath = main.compileClasspath + main.output + client.compileClasspath + client.output
+        }
+        // This are already done by Fabric, but we need it for Forge and vanilla. It shouldn't conflict at all.
+        project.tasks.named("jar", Jar::class.java) { from(client.output) }
+        project.tasks.named("sourcesJar", Jar::class.java) { from(client.allSource) }
+
+        project.extensions.configure(CCTweakedExtension::class.java) {
+            sourceDirectories.add(SourceSetReference.internal(client))
+        }
+    }
+
+    private fun setupOutgoing(sourceSet: SourceSet, suffix: String = "") {
+        setupOutgoing("${sourceSet.apiElementsConfigurationName}$suffix", sourceSet, objects.named(Usage.JAVA_API)) {
+            description = "API elements for ${sourceSet.name}"
+            extendsFrom(configurations[sourceSet.apiConfigurationName])
+        }
+
+        setupOutgoing("${sourceSet.runtimeElementsConfigurationName}$suffix", sourceSet, objects.named(Usage.JAVA_RUNTIME)) {
+            description = "Runtime elements for ${sourceSet.name}"
+            extendsFrom(configurations[sourceSet.implementationConfigurationName], configurations[sourceSet.runtimeOnlyConfigurationName])
+        }
+    }
+
+    /**
+     * Set up an outgoing configuration for a specific source set. We set an additional "main" or "client" capability
+     * (depending on the source set name) which allows downstream projects to consume them separately (see
+     * [DependencyHandler.commonClasses] and [DependencyHandler.clientClasses]).
+     */
+    private fun setupOutgoing(name: String, sourceSet: SourceSet, usage: Usage, configure: Configuration.() -> Unit) {
+        configurations.register(name) {
+            isVisible = false
+            isCanBeConsumed = true
+            isCanBeResolved = false
+
+            configure(this)
+
+            attributes {
+                attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category.LIBRARY))
+                attribute(Usage.USAGE_ATTRIBUTE, usage)
+                attribute(Bundling.BUNDLING_ATTRIBUTE, objects.named(Bundling.EXTERNAL))
+                attributeProvider(
+                    TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE,
+                    java.toolchain.languageVersion.map { it.asInt() },
+                )
+                attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements.JAR))
+            }
+
+            outgoing {
+                capability(BasicOutgoingCapability(project, sourceSet.name))
+
+                // We have two outgoing variants here: the original jar and the classes.
+                artifact(project.tasks.named(sourceSet.jarTaskName))
+
+                variants.create("classes") {
+                    attributes.attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements.CLASSES))
+                    sourceSet.output.classesDirs.forEach { artifact(it) { builtBy(sourceSet.output) } }
+                }
+            }
+        }
+    }
+
+    companion object {
+        fun setup(project: Project) {
+            MinecraftConfigurations(project).setup()
+        }
+    }
+}
+
+private class BasicIncomingCapability(private val module: ModuleDependency, private val name: String) : Capability {
+    override fun getGroup(): String = module.group!!
+    override fun getName(): String = "${module.name}-$name"
+    override fun getVersion(): String? = null
+}
+
+private class BasicOutgoingCapability(private val project: Project, private val name: String) : Capability {
+    override fun getGroup(): String = project.group.toString()
+    override fun getName(): String = "${project.name}-$name"
+    override fun getVersion(): String = project.version.toString()
+}
+
+fun DependencyHandler.clientClasses(notation: Any): ModuleDependency {
+    val dep = create(notation) as ModuleDependency
+    dep.capabilities { requireCapability(BasicIncomingCapability(dep, "client")) }
+    return dep
+}
+
+fun DependencyHandler.commonClasses(notation: Any): ModuleDependency {
+    val dep = create(notation) as ModuleDependency
+    dep.capabilities { requireCapability(BasicIncomingCapability(dep, "main")) }
+    return dep
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftExec.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftExec.kt
@@ -0,0 +1,215 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import net.minecraftforge.gradle.common.util.RunConfig
+import org.gradle.api.GradleException
+import org.gradle.api.file.FileSystemOperations
+import org.gradle.api.invocation.Gradle
+import org.gradle.api.provider.Provider
+import org.gradle.api.services.BuildService
+import org.gradle.api.services.BuildServiceParameters
+import org.gradle.api.tasks.*
+import org.gradle.kotlin.dsl.getByName
+import org.gradle.language.base.plugins.LifecycleBasePlugin
+import java.io.File
+import java.nio.file.Files
+import java.util.concurrent.TimeUnit
+import java.util.function.Supplier
+import javax.inject.Inject
+import kotlin.random.Random
+
+/**
+ * A [JavaExec] task for client-tests. This sets some common setup, and uses [MinecraftRunnerService] to ensure only one
+ * test runs at once.
+ */
+abstract class ClientJavaExec : JavaExec() {
+    private val clientRunner: Provider<MinecraftRunnerService> = MinecraftRunnerService.get(project.gradle)
+
+    init {
+        group = LifecycleBasePlugin.VERIFICATION_GROUP
+        usesService(clientRunner)
+    }
+
+    @get:Input
+    val renderdoc get() = project.hasProperty("renderdoc")
+
+    /**
+     * When [false], tests will not be run automatically, allowing the user to debug rendering.
+     */
+    @get:Input
+    val clientDebug get() = renderdoc || project.hasProperty("clientDebug")
+
+    /**
+     * When [false], tests will not run under a framebuffer.
+     */
+    @get:Input
+    val useFramebuffer get() = !clientDebug && !project.hasProperty("clientNoFramebuffer")
+
+    /**
+     * The path test results are written to.
+     */
+    @get:OutputFile
+    val testResults = project.layout.buildDirectory.file("test-results/$name.xml")
+
+    private fun setTestProperties() {
+        if (!clientDebug) systemProperty("cctest.client", "")
+        if (renderdoc) environment("LD_PRELOAD", "/usr/lib/librenderdoc.so")
+        systemProperty("cctest.gametest-report", testResults.get().asFile.absoluteFile)
+        workingDir(project.layout.buildDirectory.dir("gametest/$name"))
+    }
+
+    init {
+        setTestProperties()
+    }
+
+    /**
+     * Set this task to run a given [RunConfig].
+     */
+    fun setRunConfig(config: RunConfig) {
+        (this as JavaExec).setRunConfig(config)
+        setTestProperties() // setRunConfig may clobber some properties, ensure everything is set.
+    }
+
+    /**
+     * Copy configuration from a task with the given name.
+     */
+    fun copyFrom(path: String) = copyFrom(project.tasks.getByName(path, JavaExec::class))
+
+    /**
+     * Copy configuration from an existing [JavaExec] task.
+     */
+    fun copyFrom(task: JavaExec) {
+        for (dep in task.dependsOn) dependsOn(dep)
+        task.copyToFull(this)
+        setTestProperties() // copyToFull may clobber some properties, ensure everything is set.
+    }
+
+    /**
+     * Only run tests with the given tags.
+     */
+    fun tags(vararg tags: String) {
+        systemProperty("cctest.tags", tags.joinToString(","))
+    }
+
+    /**
+     * Write a file with the given contents before starting Minecraft. This may be useful for writing config files.
+     */
+    fun withFileContents(path: Any, contents: Supplier<String>) {
+        val file = project.file(path).toPath()
+        doFirst {
+            Files.createDirectories(file.parent)
+            Files.writeString(file, contents.get())
+        }
+    }
+
+    /**
+     * Copy a file to the provided path before starting Minecraft. This copy only occurs if the file does not already
+     * exist.
+     */
+    fun withFileFrom(path: Any, source: Supplier<File>) {
+        val file = project.file(path).toPath()
+        doFirst {
+            Files.createDirectories(file.parent)
+            if (!Files.exists(file)) Files.copy(source.get().toPath(), file)
+        }
+    }
+
+    @TaskAction
+    override fun exec() {
+        Files.createDirectories(workingDir.toPath())
+        fsOperations.delete { delete(workingDir.resolve("screenshots")) }
+
+        if (useFramebuffer) {
+            clientRunner.get().wrapClient(this) { super.exec() }
+        } else {
+            super.exec()
+        }
+    }
+
+    @get:Inject
+    protected abstract val fsOperations: FileSystemOperations
+}
+
+/**
+ * A service for [JavaExec] tasks which start Minecraft.
+ *
+ * Tasks may run `usesService(MinecraftRunnerService.get(gradle))` to ensure that only one Minecraft-related task runs
+ * at once.
+ */
+abstract class MinecraftRunnerService : BuildService<BuildServiceParameters.None> {
+    private val hasXvfb = lazy {
+        System.getProperty("os.name", "").equals("linux", ignoreCase = true) && ProcessHelpers.onPath("xvfb-run")
+    }
+
+    internal fun wrapClient(exec: JavaExec, run: () -> Unit) = when {
+        hasXvfb.value -> runXvfb(exec, run)
+        else -> run()
+    }
+
+    /**
+     * Run a program under Xvfb, preventing it spawning a window.
+     */
+    private fun runXvfb(exec: JavaExec, run: () -> Unit) {
+        fun ProcessBuilder.startVerbose(): Process {
+            exec.logger.info("Running ${this.command()}")
+            return start()
+        }
+
+        CloseScope().use { scope ->
+            val dir = Files.createTempDirectory("cctweaked").toAbsolutePath()
+            scope.add { fsOperations.delete { delete(dir) } }
+
+            val authFile = Files.createTempFile(dir, "Xauthority", "").toAbsolutePath()
+
+            val cookie = StringBuilder().also {
+                for (i in 0..31) it.append("0123456789abcdef"[Random.nextInt(16)])
+            }.toString()
+
+            val xvfb =
+                ProcessBuilder("Xvfb", "-displayfd", "1", "-screen", "0", "640x480x24", "-nolisten", "tcp").also {
+                    it.inheritIO()
+                    it.environment()["XAUTHORITY"] = authFile.toString()
+                    it.redirectOutput(ProcessBuilder.Redirect.PIPE)
+                }.startVerbose()
+            scope.add { xvfb.destroyForcibly().waitFor() }
+
+            val server = xvfb.inputReader().use { it.readLine().trim() }
+            exec.logger.info("Running at :$server (XAUTHORITY=$authFile.toA")
+
+            ProcessBuilder("xauth", "add", ":$server", ".", cookie).also {
+                it.inheritIO()
+                it.environment()["XAUTHORITY"] = authFile.toString()
+            }.startVerbose().waitForOrThrow("Failed to setup XAuthority file")
+
+            scope.add {
+                ProcessBuilder("xauth", "remove", ":$server").also {
+                    it.inheritIO()
+                    it.environment()["XAUTHORITY"] = authFile.toString()
+                }.startVerbose().waitFor()
+            }
+
+            // Wait a few seconds for Xvfb to start. Ugly, but identical to xvfb-run.
+            if (xvfb.waitFor(3, TimeUnit.SECONDS)) {
+                throw GradleException("Xvfb unexpectedly exited (with status code ${xvfb.exitValue()})")
+            }
+
+            exec.environment("XAUTHORITY", authFile.toString())
+            exec.environment("DISPLAY", ":$server")
+
+            run()
+        }
+    }
+
+    @get:Inject
+    protected abstract val fsOperations: FileSystemOperations
+
+    companion object {
+        fun get(gradle: Gradle): Provider<MinecraftRunnerService> =
+            gradle.sharedServices.registerIfAbsent("cc.tweaked.gradle.ClientJavaExec", MinecraftRunnerService::class.java) {
+                maxParallelUsages.set(1)
+            }
+    }
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/Node.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/Node.kt
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.gradle.api.DefaultTask
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/ProcessHelpers.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/ProcessHelpers.kt
@@ -1,35 +1,54 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
 package cc.tweaked.gradle

 import org.codehaus.groovy.runtime.ProcessGroovyMethods
+import org.gradle.api.GradleException
 import java.io.BufferedReader
-import java.io.IOException
+import java.io.File
 import java.io.InputStreamReader
-import java.util.stream.Collectors

 internal object ProcessHelpers {
    fun startProcess(vararg command: String): Process {
        // Something randomly passes in "GIT_DIR=" as an environment variable which clobbers everything else. Don't
        // inherit the environment array!
-        return Runtime.getRuntime().exec(command, arrayOfNulls(0))
+        return ProcessBuilder()
+            .command(*command)
+            .redirectError(ProcessBuilder.Redirect.INHERIT)
+            .also { it.environment().clear() }
+            .start()
    }

    fun captureOut(vararg command: String): String {
        val process = startProcess(*command)
+        process.outputStream.close()
+
        val result = ProcessGroovyMethods.getText(process)
-        if (process.waitFor() != 0) throw IOException("Command exited with a non-0 status")
+        process.waitForOrThrow("Failed to run command")
        return result
    }

    fun captureLines(vararg command: String): List<String> {
-        return captureLines(startProcess(*command))
-    }
+        val process = startProcess(*command)
+        process.outputStream.close()

-    fun captureLines(process: Process): List<String> {
        val out = BufferedReader(InputStreamReader(process.inputStream)).use { reader ->
-            reader.lines().filter { it.isNotEmpty() }.collect(Collectors.toList())
+            reader.lines().filter { it.isNotEmpty() }.toList()
        }
        ProcessGroovyMethods.closeStreams(process)
-        if (process.waitFor() != 0) throw IOException("Command exited with a non-0 status")
+        process.waitForOrThrow("Failed to run command")
        return out
    }
+
+    fun onPath(name: String): Boolean {
+        val path = System.getenv("PATH") ?: return false
+        return path.splitToSequence(File.pathSeparator).any { File(it, name).exists() }
+    }
+}
+
+internal fun Process.waitForOrThrow(message: String) {
+    val ret = waitFor()
+    if (ret != 0) throw GradleException("$message (exited with $ret)")
 }
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/SourceSetReference.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/SourceSetReference.kt
@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import org.gradle.api.tasks.SourceSet
+
+data class SourceSetReference(
+    val sourceSet: SourceSet,
+    val classes: Boolean,
+    val external: Boolean,
+) {
+    companion object {
+        /** A source set in the current project. */
+        fun internal(sourceSet: SourceSet) = SourceSetReference(sourceSet, classes = true, external = false)
+
+        /** A source set from another project. */
+        fun external(sourceSet: SourceSet) = SourceSetReference(sourceSet, classes = true, external = true)
+
+        /** A source set which is inlined into the current project. */
+        fun inline(sourceSet: SourceSet) = SourceSetReference(sourceSet, classes = false, external = false)
+    }
+}
--- a/buildSrc/src/main/kotlin/cc/tweaked/gradle/XmlUtil.kt
+++ b/buildSrc/src/main/kotlin/cc/tweaked/gradle/XmlUtil.kt
@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package cc.tweaked.gradle
+
+import groovy.util.Node
+import groovy.util.NodeList
+
+object XmlUtil {
+    fun findChild(node: Node, name: String): Node? = when (val child = node.get(name)) {
+        is Node -> child
+        is NodeList -> child.singleOrNull() as Node?
+        else -> null
+    }
+}
--- a/buildSrc/src/main/kotlin/net/minecraftforge/gradle/common/util/runs/RunConfigSetup.kt
+++ b/buildSrc/src/main/kotlin/net/minecraftforge/gradle/common/util/runs/RunConfigSetup.kt
@@ -0,0 +1,51 @@
+// SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package net.minecraftforge.gradle.common.util.runs
+
+import net.minecraftforge.gradle.common.util.RunConfig
+import org.gradle.api.Project
+import org.gradle.process.CommandLineArgumentProvider
+import org.gradle.process.JavaExecSpec
+import java.io.File
+import java.util.function.Supplier
+import java.util.stream.Collectors
+import java.util.stream.Stream
+
+/**
+ * Set up a [JavaExecSpec] to execute a [RunConfig].
+ *
+ * [MinecraftRunTask] sets up all its properties when the task is executed, rather than when configured. As such, it's
+ * not possible to use [cc.tweaked.gradle.copyToFull] like we do for Fabric. Instead, we set up the task manually.
+ *
+ * Unfortunately most of the functionality we need is package-private, and so we have to put our code into the package.
+ */
+internal fun setRunConfigInternal(project: Project, spec: JavaExecSpec, config: RunConfig) {
+    spec.workingDir = File(config.workingDirectory)
+
+    spec.mainClass.set(config.main)
+    for (source in config.allSources) spec.classpath(source.runtimeClasspath)
+
+    val originalTask = project.tasks.named(config.taskName, MinecraftRunTask::class.java)
+
+    // Add argument and JVM argument via providers, to be as lazy as possible with fetching artifacts.
+    val lazyTokens = RunConfigGenerator.configureTokensLazy(
+        project, config, RunConfigGenerator.mapModClassesToGradle(project, config),
+        originalTask.get().minecraftArtifacts,
+        originalTask.get().runtimeClasspathArtifacts,
+    )
+    spec.argumentProviders.add(
+        CommandLineArgumentProvider {
+            RunConfigGenerator.getArgsStream(config, lazyTokens, false).toList()
+        },
+    )
+    spec.jvmArgumentProviders.add(
+        CommandLineArgumentProvider {
+            (if (config.isClient) config.jvmArgs + originalTask.get().additionalClientArgs.get() else config.jvmArgs).map { config.replace(lazyTokens, it) } +
+                config.properties.map { (k, v) -> "-D${k}=${config.replace(lazyTokens, v)}" }
+        },
+    )
+
+    for ((key, value) in config.environment) spec.environment(key, config.replace(lazyTokens, value))
+}
--- a/config/checkstyle/checkstyle.xml
+++ b/config/checkstyle/checkstyle.xml
@@ -1,4 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+SPDX-FileCopyrightText: 2019 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 <!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">
@@ -17,7 +24,10 @@
    <module name="TreeWalker">
        <!-- Annotations -->
        <module name="AnnotationLocation" />
-        <module name="AnnotationUseStyle" />
+        <module name="AnnotationUseStyle">
+            <!-- We want trailing commas on multiline arrays. -->
+            <property name="trailingArrayComma" value="ignore" />
+        </module>
        <module name="MissingDeprecated" />
        <module name="MissingOverride" />

@@ -26,17 +36,11 @@
        <module name="EmptyCatchBlock">
            <property name="exceptionVariableName" value="ignored" />
        </module>
-        <module name="LeftCurly">
-            <property name="option" value="nl" />
-            <!-- The defaults, minus lambdas. -->
-            <property name="tokens" value="ANNOTATION_DEF,CLASS_DEF,CTOR_DEF,ENUM_CONSTANT_DEF,ENUM_DEF,INTERFACE_DEF,LITERAL_CASE,LITERAL_CATCH,LITERAL_DEFAULT,LITERAL_DO,LITERAL_ELSE,LITERAL_FINALLY,LITERAL_FOR,LITERAL_IF,LITERAL_SWITCH,LITERAL_SYNCHRONIZED,LITERAL_TRY,LITERAL_WHILE,METHOD_DEF,OBJBLOCK,STATIC_INIT" />
-        </module>
+        <module name="LeftCurly" />
        <module name="NeedBraces">
            <property name="allowSingleLineStatement" value="true"/>
        </module>
-        <module name="RightCurly">
-            <property name="option" value="alone" />
-        </module>
+        <module name="RightCurly" />

        <!-- Class design. As if we've ever followed good practice here. -->
        <module name="FinalClass" />
@@ -58,20 +62,29 @@
        <module name="SimplifyBooleanExpression" />
        <module name="SimplifyBooleanReturn" />
        <module name="StringLiteralEquality" />
-        <module name="UnnecessaryParentheses" />
+        <module name="UnnecessaryParentheses">
+            <!-- Default minus LAND. -->
+            <property name="tokens" value="EXPR,IDENT,NUM_DOUBLE,NUM_FLOAT,NUM_INT,NUM_LONG,STRING_LITERAL,LITERAL_NULL,LITERAL_FALSE,LITERAL_TRUE,ASSIGN,BAND_ASSIGN,BOR_ASSIGN,BSR_ASSIGN,BXOR_ASSIGN,DIV_ASSIGN,MINUS_ASSIGN,MOD_ASSIGN,PLUS_ASSIGN,SL_ASSIGN,SR_ASSIGN,STAR_ASSIGN,LAMBDA,TEXT_BLOCK_LITERAL_BEGIN,LITERAL_INSTANCEOF,GT,LT,GE,LE,EQUAL,NOT_EQUAL,UNARY_MINUS,UNARY_PLUS,INC,DEC,LNOT,BNOT,POST_INC,POST_DEC" />
+        </module>
        <module name="UnnecessarySemicolonAfterTypeMemberDeclaration" />
        <module name="UnnecessarySemicolonInTryWithResources" />
        <module name="UnnecessarySemicolonInEnumeration" />

        <!-- Imports -->
-        <module name="CustomImportOrder" />
+        <module name="CustomImportOrder">
+            <property name="customImportOrderRules"
+                value="THIRD_PARTY_PACKAGE###STANDARD_JAVA_PACKAGE###STATIC"
+            />
+        </module>
        <module name="IllegalImport" />
        <module name="RedundantImport" />
        <module name="UnusedImports" />

        <!-- Javadoc -->
        <!-- TODO: Missing* checks for the dan200.computercraft.api package? -->
-        <module name="AtclauseOrder" />
+        <module name="AtclauseOrder">
+            <property name="tagOrder" value="@param, @return, @throws, @deprecated"/>
+        </module>
        <module name="InvalidJavadocPosition" />
        <module name="JavadocBlockTagLocation" />
        <module name="JavadocMethod"/>
@@ -99,20 +112,19 @@
        <module name="LambdaParameterName" />
        <module name="LocalFinalVariableName" />
        <module name="LocalVariableName" />
-        <module name="MemberName" />
-        <module name="MethodName" />
+        <module name="MemberName">
+            <property name="format" value="^\$?[a-z][a-zA-Z0-9]*$" />
+        </module>
+        <module name="MethodName">
+            <property name="format" value="^(computercraft\$)?[a-z][a-zA-Z0-9]*$" />
+        </module>
        <module name="MethodTypeParameterName" />
        <module name="PackageName">
-            <property name="format" value="^dan200\.computercraft(\.[a-z][a-z0-9]*)*" />
+            <property name="format" value="^(dan200\.computercraft|cc\.tweaked)(\.[a-z][a-z0-9]*)*" />
        </module>
        <module name="ParameterName" />
        <module name="StaticVariableName">
-            <property name="format" value="^[a-z][a-zA-Z0-9]*|CAPABILITY(_[A-Z_]+)?$" />
-            <property name="applyToPrivate" value="false" />
-        </module>
-        <module name="StaticVariableName">
-            <property name="format" value="^(s_)?[a-z][a-zA-Z0-9]*|CAPABILITY(_[A-Z_]+)?$" />
-            <property name="applyToPrivate" value="true" />
+            <property name="format" value="^[a-z][a-zA-Z0-9]*$" />
        </module>
        <module name="TypeName" />

@@ -125,18 +137,11 @@
        <module name="MethodParamPad" />
        <module name="NoLineWrap" />
        <module name="NoWhitespaceAfter">
-            <property name="tokens" value="AT,INC,DEC,UNARY_MINUS,UNARY_PLUS,BNOT,LNOT,DOT,ARRAY_DECLARATOR,INDEX_OP" />
+            <property name="tokens" value="AT,INC,DEC,UNARY_MINUS,UNARY_PLUS,BNOT,LNOT,DOT,ARRAY_DECLARATOR,INDEX_OP,METHOD_REF" />
        </module>
        <module name="NoWhitespaceBefore" />
        <!-- TODO: Decide on an OperatorWrap style. -->
-        <module name="ParenPad">
-            <property name="option" value="space" />
-            <property name="tokens" value="ANNOTATION,ANNOTATION_FIELD_DEF,CTOR_CALL,CTOR_DEF,ENUM_CONSTANT_DEF,LITERAL_CATCH,LITERAL_DO,LITERAL_FOR,LITERAL_IF,LITERAL_NEW,LITERAL_SWITCH,LITERAL_SYNCHRONIZED,LITERAL_WHILE,METHOD_CALL,METHOD_DEF,RESOURCE_SPECIFICATION,SUPER_CTOR_CALL,LAMBDA" />
-        </module>
-        <module name="ParenPad">
-            <property name="option" value="nospace" />
-            <property name="tokens" value="DOT,EXPR,QUESTION" />
-        </module>
+        <module name="ParenPad" />
        <module name="SeparatorWrap">
            <property name="option" value="eol" />
            <property name="tokens" value="COMMA,SEMI,ELLIPSIS,ARRAY_DECLARATOR,RBRACK,METHOD_REF" />
@@ -156,6 +161,7 @@
            <property name="allowEmptyLambdas" value="true" />
            <property name="allowEmptyMethods" value="true" />
            <property name="allowEmptyConstructors" value="true" />
+            <property name="allowEmptyTypes" value="true" />

            <property name="tokens" value="ASSIGN,BAND,BAND_ASSIGN,BOR,BOR_ASSIGN,BSR,BSR_ASSIGN,BXOR,BXOR_ASSIGN,COLON,DIV,DIV_ASSIGN,EQUAL,GE,GT,LAMBDA,LAND,LCURLY,LE,LITERAL_RETURN,LOR,LT,MINUS,MINUS_ASSIGN,MOD,MOD_ASSIGN,NOT_EQUAL,PLUS,PLUS_ASSIGN,QUESTION,RCURLY,SL,SLIST,SL_ASSIGN,SR,SR_ASSIGN,STAR,STAR_ASSIGN,LITERAL_ASSERT,TYPE_EXTENSION_AND" />
        </module>
--- a/config/checkstyle/suppressions.xml
+++ b/config/checkstyle/suppressions.xml
@@ -1,4 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+SPDX-FileCopyrightText: 2019 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 <!DOCTYPE suppressions PUBLIC
    "-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
    "https://checkstyle.org/dtds/suppressions_1_2.dtd">
@@ -9,4 +16,10 @@

    <!-- The commands API is documented in Lua. -->
    <suppress checks="SummaryJavadocCheck" files=".*[\\/]CommandAPI.java" />
+
+    <!-- Allow putting files in other packages if they look like our TeaVM stubs. -->
+    <suppress checks="PackageName" files=".*[\\/]T[A-Za-z]+.java" />
+
+    <!-- Allow underscores in our test classes. -->
+    <suppress checks="MethodName" files=".*Contract.java" />
 </suppressions>
--- a/config/gitpod/Dockerfile
+++ b/config/gitpod/Dockerfile
@@ -1,8 +1,12 @@
+# SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: MPL-2.0
+
 FROM gitpod/workspace-base

 USER gitpod

 RUN sudo apt-get -q update \
- && sudo apt-get install -yq openjdk-8-jdk openjdk-16-jdk python3-pip npm \
+ && sudo apt-get install -yq openjdk-16-jdk python3-pip npm \
 && sudo pip3 install pre-commit \
- && sudo update-java-alternatives --set java-1.8.0-openjdk-amd64
+ && sudo update-java-alternatives --set java-1.16.0-openjdk-amd64
--- a/config/idea/codeInspectionSettings.xml
+++ b/config/idea/codeInspectionSettings.xml
--- a/config/idea/codeStyleSettings.xml
+++ b/config/idea/codeStyleSettings.xml
@@ -1,61 +0,0 @@
-<code_scheme name="Project" version="173">
-  <JSON>
-    <option name="OBJECT_WRAPPING" value="1" />
-    <option name="ARRAY_WRAPPING" value="1" />
-  </JSON>
-  <JavaCodeStyleSettings>
-    <option name="PACKAGES_TO_USE_IMPORT_ON_DEMAND">
-      <value />
-    </option>
-    <option name="JD_P_AT_EMPTY_LINES" value="false" />
-    <option name="JD_PRESERVE_LINE_FEEDS" value="true" />
-  </JavaCodeStyleSettings>
-  <codeStyleSettings language="JAVA">
-    <option name="KEEP_FIRST_COLUMN_COMMENT" value="false" />
-    <option name="BRACE_STYLE" value="2" />
-    <option name="CLASS_BRACE_STYLE" value="2" />
-    <option name="METHOD_BRACE_STYLE" value="2" />
-    <option name="LAMBDA_BRACE_STYLE" value="5" />
-    <option name="ELSE_ON_NEW_LINE" value="true" />
-    <option name="CATCH_ON_NEW_LINE" value="true" />
-    <option name="FINALLY_ON_NEW_LINE" value="true" />
-    <option name="SPACE_WITHIN_METHOD_CALL_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_METHOD_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_IF_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_WHILE_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_FOR_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_TRY_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_CATCH_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_SWITCH_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_SYNCHRONIZED_PARENTHESES" value="true" />
-    <option name="SPACE_WITHIN_ARRAY_INITIALIZER_BRACES" value="true" />
-    <option name="SPACE_BEFORE_IF_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_WHILE_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_FOR_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_TRY_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_CATCH_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_SWITCH_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_SYNCHRONIZED_PARENTHESES" value="false" />
-    <option name="SPACE_BEFORE_ARRAY_INITIALIZER_LBRACE" value="true" />
-    <option name="KEEP_SIMPLE_METHODS_IN_ONE_LINE" value="true" />
-    <option name="KEEP_SIMPLE_LAMBDAS_IN_ONE_LINE" value="true" />
-    <option name="KEEP_SIMPLE_CLASSES_IN_ONE_LINE" value="true" />
-    <option name="IF_BRACE_FORCE" value="1" />
-    <option name="DOWHILE_BRACE_FORCE" value="1" />
-    <option name="WHILE_BRACE_FORCE" value="1" />
-    <option name="FOR_BRACE_FORCE" value="1" />
-    <option name="SPACE_WITHIN_ANNOTATION_PARENTHESES" value="true" />
-    <indentOptions>
-      <option name="CONTINUATION_INDENT_SIZE" value="4" />
-    </indentOptions>
-  </codeStyleSettings>
-  <codeStyleSettings language="JSON">
-    <option name="KEEP_BLANK_LINES_IN_CODE" value="1" />
-    <option name="SPACE_WITHIN_BRACKETS" value="true" />
-    <option name="SPACE_WITHIN_BRACES" value="true" />
-    <indentOptions>
-      <option name="INDENT_SIZE" value="4" />
-      <option name="CONTINUATION_INDENT_SIZE" value="4" />
-    </indentOptions>
-  </codeStyleSettings>
-</code_scheme>
--- a/config/license/api.txt
+++ b/config/license/api.txt
@@ -1,3 +0,0 @@
-This file is part of the public ComputerCraft API - http://www.computercraft.info
-Copyright Daniel Ratcliffe, 2011-${year}. This API may be redistributed unmodified and in full only.
-For help using the API, and posting your mods, visit the forums at computercraft.info.
--- a/config/license/main.txt
+++ b/config/license/main.txt
@@ -1,3 +0,0 @@
-This file is part of ComputerCraft - http://www.computercraft.info
-Copyright Daniel Ratcliffe, 2011-${year}. Do not distribute without permission.
-Send enquiries to dratcliffe@gmail.com
--- a/doc/events/alarm.md
+++ b/doc/events/alarm.md
@@ -3,19 +3,26 @@ module: [kind=event] alarm
 see: os.setAlarm To start an alarm.
 ---

-The @{timer} event is fired when an alarm started with @{os.setAlarm} completes.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`alarm`] event is fired when an alarm started with [`os.setAlarm`] completes.

 ## Return Values
-1. @{string}: The event name.
-2. @{number}: The ID of the alarm that finished.
+1. [`string`]: The event name.
+2. [`number`]: The ID of the alarm that finished.

 ## Example
-Starts a timer and then prints its ID:
+Starts a timer and then waits for it to complete.
+
 ```lua
-local alarmID = os.setAlarm(os.time() + 0.05)
+local alarm_id = os.setAlarm(os.time() + 0.05)
 local event, id
 repeat
    event, id = os.pullEvent("alarm")
-until id == alarmID
+until id == alarm_id
 print("Alarm with ID " .. id .. " was fired")
 ```
--- a/doc/events/char.md
+++ b/doc/events/char.md
@@ -3,22 +3,29 @@ module: [kind=event] char
 see: key To listen to any key press.
 ---

-The @{char} event is fired when a character is _typed_ on the keyboard.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-The @{char} event is different to a key press. Sometimes multiple key presses may result in one character being
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`char`] event is fired when a character is typed on the keyboard.
+
+The [`char`] event is different to a key press. Sometimes multiple key presses may result in one character being
 typed (for instance, on some European keyboards). Similarly, some keys (e.g. <kbd>Ctrl</kbd>) do not have any
-corresponding character. The @{key} should be used if you want to listen to key presses themselves.
+corresponding character. The [`key`] should be used if you want to listen to key presses themselves.

 ## Return values
-1. @{string}: The event name.
-2. @{string}: The string representing the character that was pressed.
+1. [`string`]: The event name.
+2. [`string`]: The string representing the character that was pressed.


 ## Example
 Prints each character the user presses:
+
 ```lua
 while true do
-  local event, character = os.pullEvent("char")
-  print(character .. " was pressed.")
+    local event, character = os.pullEvent("char")
+    print(character .. " was pressed.")
 end
 ```
--- a/doc/events/computer_command.md
+++ b/doc/events/computer_command.md
@@ -2,11 +2,17 @@
 module: [kind=event] computer_command
 ---

-The @{computer_command} event is fired when the `/computercraft queue` command is run for the current computer.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`computer_command`] event is fired when the `/computercraft queue` command is run for the current computer.

 ## Return Values
-1. @{string}: The event name.
-... @{string}: The arguments passed to the command.
+1. [`string`]: The event name.
+2. [`string`]<abbr title="Variable number of arguments">&hellip;</abbr>: The arguments passed to the command.

 ## Example
 Prints the contents of messages sent:
--- a/doc/events/disk.md
+++ b/doc/events/disk.md
@@ -3,11 +3,17 @@ module: [kind=event] disk
 see: disk_eject For the event sent when a disk is removed.
 ---

-The @{disk} event is fired when a disk is inserted into an adjacent or networked disk drive.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`disk`] event is fired when a disk is inserted into an adjacent or networked disk drive.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side of the disk drive that had a disk inserted.
+1. [`string`]: The event name.
+2. [`string`]: The side of the disk drive that had a disk inserted.

 ## Example
 Prints a message when a disk is inserted:
--- a/doc/events/disk_eject.md
+++ b/doc/events/disk_eject.md
@@ -3,11 +3,17 @@ module: [kind=event] disk_eject
 see: disk For the event sent when a disk is inserted.
 ---

-The @{disk_eject} event is fired when a disk is removed from an adjacent or networked disk drive.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`disk_eject`] event is fired when a disk is removed from an adjacent or networked disk drive.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side of the disk drive that had a disk removed.
+1. [`string`]: The event name.
+2. [`string`]: The side of the disk drive that had a disk removed.

 ## Example
 Prints a message when a disk is removed:
--- a/doc/events/file_transfer.md
+++ b/doc/events/file_transfer.md
@@ -3,15 +3,21 @@ module: [kind=event] file_transfer
 since: 1.101.0
 ---

-The @{file_transfer} event is queued when a user drags-and-drops a file on an open computer.
+<!--
+SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers

-This event contains a single argument, that in turn has a single method @{TransferredFiles.getFiles|getFiles}. This
-returns the list of files that are being transferred. Each file is a @{fs.BinaryReadHandle|binary file handle} with an
-additional @{TransferredFile.getName|getName} method.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`file_transfer`] event is queued when a user drags-and-drops a file on an open computer.
+
+This event contains a single argument of type [`TransferredFiles`], which can be used to [get the files to be
+transferred][`TransferredFiles.getFiles`]. Each file returned is a [binary file handle][`fs.BinaryReadHandle`] with an
+additional [getName][`TransferredFile.getName`] method.

 ## Return values
-1. @{string}: The event name
-2. @{TransferredFiles}: The list of transferred files.
+1. [`string`]: The event name
+2. [`TransferredFiles`]: The list of transferred files.

 ## Example
 Waits for a user to drop files on top of the computer, then prints the list of files and the size of each file.
@@ -23,7 +29,7 @@ for _, file in ipairs(files.getFiles()) do
  local size = file.seek("end")
  file.seek("set", 0)

-  print(file.getName() .. " " .. file.getSize())
+  print(file.getName() .. " " .. size)
 end
 ```

--- a/doc/events/http_check.md
+++ b/doc/events/http_check.md
@@ -3,12 +3,18 @@ module: [kind=event] http_check
 see: http.checkURLAsync To check a URL asynchronously.
 ---

-The @{http_check} event is fired when a URL check finishes.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled inside @{http.checkURL}, but it can still be seen when using @{http.checkURLAsync}.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`http_check`] event is fired when a URL check finishes.
+
+This event is normally handled inside [`http.checkURL`], but it can still be seen when using [`http.checkURLAsync`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL requested to be checked.
-3. @{boolean}: Whether the check succeeded.
-4. @{string|nil}: If the check failed, a reason explaining why the check failed.
+1. [`string`]: The event name.
+2. [`string`]: The URL requested to be checked.
+3. [`boolean`]: Whether the check succeeded.
+4. <span class="type">[`string`]|[`nil`]</span>: If the check failed, a reason explaining why the check failed.
--- a/doc/events/http_failure.md
+++ b/doc/events/http_failure.md
@@ -3,15 +3,22 @@ module: [kind=event] http_failure
 see: http.request To send an HTTP request.
 ---

-The @{http_failure} event is fired when an HTTP request fails.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled inside @{http.get} and @{http.post}, but it can still be seen when using @{http.request}.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`http_failure`] event is fired when an HTTP request fails.
+
+This event is normally handled inside [`http.get`] and [`http.post`], but it can still be seen when using [`http.request`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the site requested.
-3. @{string}: An error describing the failure.
-4. @{http.Response|nil}: A response handle if the connection succeeded, but the server's response indicated failure.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the site requested.
+3. [`string`]: An error describing the failure.
+4. <span class="type">[`http.Response`]|[`nil`]</span>: A response handle if the connection succeeded, but the server's
+   response indicated failure.

 ## Example
 Prints an error why the website cannot be contacted:
--- a/doc/events/http_success.md
+++ b/doc/events/http_success.md
@@ -3,14 +3,20 @@ module: [kind=event] http_success
 see: http.request To make an HTTP request.
 ---

-The @{http_success} event is fired when an HTTP request returns successfully.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled inside @{http.get} and @{http.post}, but it can still be seen when using @{http.request}.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`http_success`] event is fired when an HTTP request returns successfully.
+
+This event is normally handled inside [`http.get`] and [`http.post`], but it can still be seen when using [`http.request`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the site requested.
-3. @{http.Response}: The handle for the response text.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the site requested.
+3. [`http.Response`]: The successful HTTP response.

 ## Example
 Prints the content of a website (this may fail if the request fails):
--- a/doc/events/key.md
+++ b/doc/events/key.md
@@ -2,18 +2,24 @@
 module: [kind=event] key
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 This event is fired when any key is pressed while the terminal is focused.

 This event returns a numerical "key code" (for instance, <kbd>F1</kbd> is 290). This value may vary between versions and
-so it is recommended to use the constants in the @{keys} API rather than hard coding numeric values.
+so it is recommended to use the constants in the [`keys`] API rather than hard coding numeric values.

-If the button pressed represented a printable character, then the @{key} event will be followed immediately by a @{char}
-event. If you are consuming text input, use a @{char} event instead!
+If the button pressed represented a printable character, then the [`key`] event will be followed immediately by a [`char`]
+event. If you are consuming text input, use a [`char`] event instead!

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The numerical key value of the key pressed.
-3. @{boolean}: Whether the key event was generated while holding the key (@{true}), rather than pressing it the first time (@{false}).
+1. [`string`]: The event name.
+2. [`number`]: The numerical key value of the key pressed.
+3. [`boolean`]: Whether the key event was generated while holding the key ([`true`]), rather than pressing it the first time ([`false`]).

 ## Example
 Prints each key when the user presses it, and if the key is being held.
--- a/doc/events/key_up.md
+++ b/doc/events/key_up.md
@@ -3,17 +3,23 @@ module: [kind=event] key_up
 see: keys For a lookup table of the given keys.
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 Fired whenever a key is released (or the terminal is closed while a key was being pressed).

 This event returns a numerical "key code" (for instance, <kbd>F1</kbd> is 290). This value may vary between versions and
-so it is recommended to use the constants in the @{keys} API rather than hard coding numeric values.
+so it is recommended to use the constants in the [`keys`] API rather than hard coding numeric values.

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The numerical key value of the key pressed.
+1. [`string`]: The event name.
+2. [`number`]: The numerical key value of the key pressed.

 ## Example
-Prints each key released on the keyboard whenever a @{key_up} event is fired.
+Prints each key released on the keyboard whenever a [`key_up`] event is fired.

 ```lua
 while true do
--- a/doc/events/modem_message.md
+++ b/doc/events/modem_message.md
@@ -2,25 +2,33 @@
 module: [kind=event] modem_message
 ---

-The @{modem_message} event is fired when a message is received on an open channel on any @{modem}.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`modem_message`] event is fired when a message is received on an open channel on any [`modem`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side of the modem that received the message.
-3. @{number}: The channel that the message was sent on.
-4. @{number}: The reply channel set by the sender.
-5. @{any}: The message as sent by the sender.
-6. @{number}: The distance between the sender and the receiver, in blocks.
+1. [`string`]: The event name.
+2. [`string`]: The side of the modem that received the message.
+3. [`number`]: The channel that the message was sent on.
+4. [`number`]: The reply channel set by the sender.
+5. [`any`]: The message as sent by the sender.
+6. <span class="type">[`number`]|[`nil`]</span>: The distance between the sender and the receiver in blocks, or [`nil`] if the message was sent between dimensions.

 ## Example
-Wraps a @{modem} peripheral, opens channel 0 for listening, and prints all received messages.
+Wraps a [`modem`] peripheral, opens channel 0 for listening, and prints all received messages.

 ```lua
 local modem = peripheral.find("modem") or error("No modem attached", 0)
 modem.open(0)

 while true do
-  local event, side, channel, replyChannel, message, distance = os.pullEvent("modem_message")
-  print(("Message received on side %s on channel %d (reply to %d) from %f blocks away with message %s"):format(side, channel, replyChannel, distance, tostring(message)))
+    local event, side, channel, replyChannel, message, distance = os.pullEvent("modem_message")
+    print(("Message received on side %s on channel %d (reply to %d) from %f blocks away with message %s"):format(
+        side, channel, replyChannel, distance, tostring(message)
+    ))
 end
 ```
--- a/doc/events/monitor_resize.md
+++ b/doc/events/monitor_resize.md
@@ -2,14 +2,21 @@
 module: [kind=event] monitor_resize
 ---

-The @{monitor_resize} event is fired when an adjacent or networked monitor's size is changed.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`monitor_resize`] event is fired when an adjacent or networked monitor's size is changed.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side or network ID of the monitor that resized.
+1. [`string`]: The event name.
+2. [`string`]: The side or network ID of the monitor that was resized.

 ## Example
 Prints a message when a monitor is resized:
+
 ```lua
 while true do
  local event, side = os.pullEvent("monitor_resize")
--- a/doc/events/monitor_touch.md
+++ b/doc/events/monitor_touch.md
@@ -2,13 +2,19 @@
 module: [kind=event] monitor_touch
 ---

-The @{monitor_touch} event is fired when an adjacent or networked Advanced Monitor is right-clicked.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`monitor_touch`] event is fired when an adjacent or networked Advanced Monitor is right-clicked.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side or network ID of the monitor that was touched.
-3. @{number}: The X coordinate of the touch, in characters.
-4. @{number}: The Y coordinate of the touch, in characters.
+1. [`string`]: The event name.
+2. [`string`]: The side or network ID of the monitor that was touched.
+3. [`number`]: The X coordinate of the touch, in characters.
+4. [`number`]: The Y coordinate of the touch, in characters.

 ## Example
 Prints a message when a monitor is touched:
--- a/doc/events/mouse_click.md
+++ b/doc/events/mouse_click.md
@@ -2,17 +2,23 @@
 module: [kind=event] mouse_click
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 This event is fired when the terminal is clicked with a mouse. This event is only fired on advanced computers (including
 advanced turtles and pocket computers).

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The mouse button that was clicked.
-3. @{number}: The X-coordinate of the click.
-4. @{number}: The Y-coordinate of the click.
+1. [`string`]: The event name.
+2. [`number`]: The mouse button that was clicked.
+3. [`number`]: The X-coordinate of the click.
+4. [`number`]: The Y-coordinate of the click.

 ## Mouse buttons
-Several mouse events (@{mouse_click}, @{mouse_up}, @{mouse_scroll}) contain a "mouse button" code. This takes a
+Several mouse events ([`mouse_click`], [`mouse_up`], [`mouse_scroll`]) contain a "mouse button" code. This takes a
 numerical value depending on which button on your mouse was last pressed when this event occurred.

 | Button Code | Mouse Button  |
--- a/doc/events/mouse_drag.md
+++ b/doc/events/mouse_drag.md
@@ -3,13 +3,19 @@ module: [kind=event] mouse_drag
 see: mouse_click For when a mouse button is initially pressed.
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 This event is fired every time the mouse is moved while a mouse button is being held.

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The [mouse button](mouse_click.html#Mouse_buttons) that is being pressed.
-3. @{number}: The X-coordinate of the mouse.
-4. @{number}: The Y-coordinate of the mouse.
+1. [`string`]: The event name.
+2. [`number`]: The [mouse button](mouse_click.html#Mouse_buttons) that is being pressed.
+3. [`number`]: The X-coordinate of the mouse.
+4. [`number`]: The Y-coordinate of the mouse.

 ## Example
 Print the button and the coordinates whenever the mouse is dragged.
--- a/doc/events/mouse_scroll.md
+++ b/doc/events/mouse_scroll.md
@@ -2,13 +2,19 @@
 module: [kind=event] mouse_scroll
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 This event is fired when a mouse wheel is scrolled in the terminal.

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The direction of the scroll. (-1 = up, 1 = down)
-3. @{number}: The X-coordinate of the mouse when scrolling.
-4. @{number}: The Y-coordinate of the mouse when scrolling.
+1. [`string`]: The event name.
+2. [`number`]: The direction of the scroll. (-1 = up, 1 = down)
+3. [`number`]: The X-coordinate of the mouse when scrolling.
+4. [`number`]: The Y-coordinate of the mouse when scrolling.

 ## Example
 Prints the direction of each scroll, and the position of the mouse at the time.
--- a/doc/events/mouse_up.md
+++ b/doc/events/mouse_up.md
@@ -2,13 +2,19 @@
 module: [kind=event] mouse_up
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 This event is fired when a mouse button is released or a held mouse leaves the computer's terminal.

 ## Return values
-1. @{string}: The event name.
-2. @{number}: The [mouse button](mouse_click.html#Mouse_buttons) that was released.
-3. @{number}: The X-coordinate of the mouse.
-4. @{number}: The Y-coordinate of the mouse.
+1. [`string`]: The event name.
+2. [`number`]: The [mouse button](mouse_click.html#Mouse_buttons) that was released.
+3. [`number`]: The X-coordinate of the mouse.
+4. [`number`]: The Y-coordinate of the mouse.

 ## Example
 Prints the coordinates and button number whenever the mouse is released.
--- a/doc/events/paste.md
+++ b/doc/events/paste.md
@@ -2,11 +2,17 @@
 module: [kind=event] paste
 ---

-The @{paste} event is fired when text is pasted into the computer through Ctrl-V (or ⌘V on Mac).
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`paste`] event is fired when text is pasted into the computer through Ctrl-V (or ⌘V on Mac).

 ## Return values
-1. @{string}: The event name.
-2. @{string} The text that was pasted.
+1. [`string`]: The event name.
+2. [`string`] The text that was pasted.

 ## Example
 Prints pasted text:
--- a/doc/events/peripheral.md
+++ b/doc/events/peripheral.md
@@ -3,11 +3,17 @@ module: [kind=event] peripheral
 see: peripheral_detach For the event fired when a peripheral is detached.
 ---

-The @{peripheral} event is fired when a peripheral is attached on a side or to a modem.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`peripheral`] event is fired when a peripheral is attached on a side or to a modem.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side the peripheral was attached to.
+1. [`string`]: The event name.
+2. [`string`]: The side the peripheral was attached to.

 ## Example
 Prints a message when a peripheral is attached:
--- a/doc/events/peripheral_detach.md
+++ b/doc/events/peripheral_detach.md
@@ -3,11 +3,17 @@ module: [kind=event] peripheral_detach
 see: peripheral For the event fired when a peripheral is attached.
 ---

-The @{peripheral_detach} event is fired when a peripheral is detached from a side or from a modem.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`peripheral_detach`] event is fired when a peripheral is detached from a side or from a modem.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The side the peripheral was detached from.
+1. [`string`]: The event name.
+2. [`string`]: The side the peripheral was detached from.

 ## Example
 Prints a message when a peripheral is detached:
--- a/doc/events/rednet_message.md
+++ b/doc/events/rednet_message.md
@@ -4,17 +4,23 @@ see: modem_message For raw modem messages sent outside of Rednet.
 see: rednet.receive To wait for a Rednet message with an optional timeout and protocol filter.
 ---

-The @{rednet_message} event is fired when a message is sent over Rednet.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is usually handled by @{rednet.receive}, but it can also be pulled manually.
+SPDX-License-Identifier: MPL-2.0
+-->

-@{rednet_message} events are sent by @{rednet.run} in the top-level coroutine in response to @{modem_message} events. A @{rednet_message} event is always preceded by a @{modem_message} event. They are generated inside CraftOS rather than being sent by the ComputerCraft machine.
+The [`rednet_message`] event is fired when a message is sent over Rednet.
+
+This event is usually handled by [`rednet.receive`], but it can also be pulled manually.
+
+[`rednet_message`] events are sent by [`rednet.run`] in the top-level coroutine in response to [`modem_message`] events. A [`rednet_message`] event is always preceded by a [`modem_message`] event. They are generated inside CraftOS rather than being sent by the ComputerCraft machine.

 ## Return Values
-1. @{string}: The event name.
-2. @{number}: The ID of the sending computer.
-3. @{any}: The message sent.
-4. @{string|nil}: The protocol of the message, if provided.
+1. [`string`]: The event name.
+2. [`number`]: The ID of the sending computer.
+3. [`any`]: The message sent.
+4. <span class="type">[`string`]|[`nil`]</span>: The protocol of the message, if provided.

 ## Example
 Prints a message when one is sent:
--- a/doc/events/redstone.md
+++ b/doc/events/redstone.md
@@ -2,7 +2,16 @@
 module: [kind=event] redstone
 ---

-The @{event!redstone} event is fired whenever any redstone inputs on the computer change.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`event!redstone`] event is fired whenever any redstone inputs on the computer change.
+
+## Return values
+1. [`string`]: The event name.

 ## Example
 Prints a message when a redstone input changes:
--- a/doc/events/speaker_audio_empty.md
+++ b/doc/events/speaker_audio_empty.md
@@ -3,14 +3,20 @@ module: [kind=event] speaker_audio_empty
 see: speaker.playAudio To play audio using the speaker
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The name of the speaker which is available to play more audio.
+1. [`string`]: The event name.
+2. [`string`]: The name of the speaker which is available to play more audio.


 ## Example
-This uses @{io.lines} to read audio data in blocks of 16KiB from "example_song.dfpwm", and then attempts to play it
-using @{speaker.playAudio}. If the speaker's buffer is full, it waits for an event and tries again.
+This uses [`io.lines`] to read audio data in blocks of 16KiB from "example_song.dfpwm", and then attempts to play it
+using [`speaker.playAudio`]. If the speaker's buffer is full, it waits for an event and tries again.

 ```lua {data-peripheral=speaker}
 local dfpwm = require("cc.audio.dfpwm")
--- a/doc/events/task_complete.md
+++ b/doc/events/task_complete.md
@@ -3,14 +3,20 @@ module: [kind=event] task_complete
 see: commands.execAsync To run a command which fires a task_complete event.
 ---

-The @{task_complete} event is fired when an asynchronous task completes. This is usually handled inside the function call that queued the task; however, functions such as @{commands.execAsync} return immediately so the user can wait for completion.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`task_complete`] event is fired when an asynchronous task completes. This is usually handled inside the function call that queued the task; however, functions such as [`commands.execAsync`] return immediately so the user can wait for completion.

 ## Return Values
-1. @{string}: The event name.
-2. @{number}: The ID of the task that completed.
-3. @{boolean}: Whether the command succeeded.
-4. @{string}: If the command failed, an error message explaining the failure. (This is not present if the command succeeded.)
-...: Any parameters returned from the command.
+1. [`string`]: The event name.
+2. [`number`]: The ID of the task that completed.
+3. [`boolean`]: Whether the command succeeded.
+4. [`string`]: If the command failed, an error message explaining the failure. (This is not present if the command succeeded.)
+5. <abbr title="Variable number of arguments">&hellip;</abbr>: Any parameters returned from the command.

 ## Example
 Prints the results of an asynchronous command:
--- a/doc/events/term_resize.md
+++ b/doc/events/term_resize.md
@@ -2,15 +2,25 @@
 module: [kind=event] term_resize
 ---

-The @{term_resize} event is fired when the main terminal is resized. For instance:
- - When a the tab bar is shown or hidden in @{multishell}.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`term_resize`] event is fired when the main terminal is resized. For instance:
+ - When a the tab bar is shown or hidden in [`multishell`].
 - When the terminal is redirected to a monitor via the "monitor" program and the monitor is resized.

 When this event fires, some parts of the terminal may have been moved or deleted. Simple terminal programs (those
-not using @{term.setCursorPos}) can ignore this event, but more complex GUI programs should redraw the entire screen.
+not using [`term.setCursorPos`]) can ignore this event, but more complex GUI programs should redraw the entire screen.
+
+## Return values
+1. [`string`]: The event name.

 ## Example
-Prints :
+Print a message each time the terminal is resized.
+
 ```lua
 while true do
  os.pullEvent("term_resize")
--- a/doc/events/terminate.md
+++ b/doc/events/terminate.md
@@ -2,11 +2,20 @@
 module: [kind=event] terminate
 ---

-The @{terminate} event is fired when <kbd>Ctrl-T</kbd> is held down.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled by @{os.pullEvent}, and will not be returned. However, @{os.pullEventRaw} will return this event when fired.
+SPDX-License-Identifier: MPL-2.0
+-->

-@{terminate} will be sent even when a filter is provided to @{os.pullEventRaw}. When using @{os.pullEventRaw} with a filter, make sure to check that the event is not @{terminate}.
+The [`terminate`] event is fired when <kbd>Ctrl-T</kbd> is held down.
+
+This event is normally handled by [`os.pullEvent`], and will not be returned. However, [`os.pullEventRaw`] will return this event when fired.
+
+[`terminate`] will be sent even when a filter is provided to [`os.pullEventRaw`]. When using [`os.pullEventRaw`] with a filter, make sure to check that the event is not [`terminate`].
+
+## Return values
+1. [`string`]: The event name.

 ## Example
 Prints a message when Ctrl-T is held:
--- a/doc/events/timer.md
+++ b/doc/events/timer.md
@@ -3,19 +3,25 @@ module: [kind=event] timer
 see: os.startTimer To start a timer.
 ---

-The @{timer} event is fired when a timer started with @{os.startTimer} completes.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`timer`] event is fired when a timer started with [`os.startTimer`] completes.

 ## Return Values
-1. @{string}: The event name.
-2. @{number}: The ID of the timer that finished.
+1. [`string`]: The event name.
+2. [`number`]: The ID of the timer that finished.

 ## Example
-Starts a timer and then prints its ID:
+Start and wait for a timer to finish.
 ```lua
-local timerID = os.startTimer(2)
+local timer_id = os.startTimer(2)
 local event, id
 repeat
    event, id = os.pullEvent("timer")
-until id == timerID
+until id == timer_id
 print("Timer with ID " .. id .. " was fired")
 ```
--- a/doc/events/turtle_inventory.md
+++ b/doc/events/turtle_inventory.md
@@ -2,7 +2,16 @@
 module: [kind=event] turtle_inventory
 ---

-The @{turtle_inventory} event is fired when a turtle's inventory is changed.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`turtle_inventory`] event is fired when a turtle's inventory is changed.
+
+## Return values
+1. [`string`]: The event name.

 ## Example
 Prints a message when the inventory is changed:
--- a/doc/events/websocket_closed.md
+++ b/doc/events/websocket_closed.md
@@ -2,11 +2,26 @@
 module: [kind=event] websocket_closed
 ---

-The @{websocket_closed} event is fired when an open WebSocket connection is closed.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`websocket_closed`] event is fired when an open WebSocket connection is closed.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the WebSocket that was closed.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the WebSocket that was closed.
+3. <span class="type">[`string`]|[`nil`]</span>: The [server-provided reason][close_reason]
+   the websocket was closed. This will be [`nil`] if the connection was closed
+   abnormally.
+4. <span class="type">[`number`]|[`nil`]</span>: The [connection close code][close_code],
+   indicating why the socket was closed. This will be [`nil`] if the connection
+   was closed abnormally.
+
+[close_reason]: https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.6 "The WebSocket Connection Close Reason, RFC 6455"
+[close_code]: https://www.rfc-editor.org/rfc/rfc6455.html#section-7.1.5 "The WebSocket Connection Close Code, RFC 6455"

 ## Example
 Prints a message when a WebSocket is closed (this may take a minute):
--- a/doc/events/websocket_failure.md
+++ b/doc/events/websocket_failure.md
@@ -3,14 +3,20 @@ module: [kind=event] websocket_failure
 see: http.websocketAsync To send an HTTP request.
 ---

-The @{websocket_failure} event is fired when a WebSocket connection request fails.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled inside @{http.websocket}, but it can still be seen when using @{http.websocketAsync}.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`websocket_failure`] event is fired when a WebSocket connection request fails.
+
+This event is normally handled inside [`http.websocket`], but it can still be seen when using [`http.websocketAsync`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the site requested.
-3. @{string}: An error describing the failure.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the site requested.
+3. [`string`]: An error describing the failure.

 ## Example
 Prints an error why the website cannot be contacted:
--- a/doc/events/websocket_message.md
+++ b/doc/events/websocket_message.md
@@ -2,15 +2,21 @@
 module: [kind=event] websocket_message
 ---

-The @{websocket_message} event is fired when a message is received on an open WebSocket connection.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled by @{http.Websocket.receive}, but it can also be pulled manually.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`websocket_message`] event is fired when a message is received on an open WebSocket connection.
+
+This event is normally handled by [`http.Websocket.receive`], but it can also be pulled manually.

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the WebSocket.
-3. @{string}: The contents of the message.
-4. @{boolean}: Whether this is a binary message.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the WebSocket.
+3. [`string`]: The contents of the message.
+4. [`boolean`]: Whether this is a binary message.

 ## Example
 Prints a message sent by a WebSocket:
--- a/doc/events/websocket_success.md
+++ b/doc/events/websocket_success.md
@@ -3,14 +3,20 @@ module: [kind=event] websocket_success
 see: http.websocketAsync To open a WebSocket asynchronously.
 ---

-The @{websocket_success} event is fired when a WebSocket connection request returns successfully.
+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers

-This event is normally handled inside @{http.websocket}, but it can still be seen when using @{http.websocketAsync}.
+SPDX-License-Identifier: MPL-2.0
+-->
+
+The [`websocket_success`] event is fired when a WebSocket connection request returns successfully.
+
+This event is normally handled inside [`http.websocket`], but it can still be seen when using [`http.websocketAsync`].

 ## Return Values
-1. @{string}: The event name.
-2. @{string}: The URL of the site.
-3. @{http.Websocket}: The handle for the WebSocket.
+1. [`string`]: The event name.
+2. [`string`]: The URL of the site.
+3. [`http.Websocket`]: The handle for the WebSocket.

 ## Example
 Prints the content of a website (this may fail if the request fails):
--- a/doc/guides/gps_setup.md
+++ b/doc/guides/gps_setup.md
@@ -2,8 +2,14 @@
 module: [kind=guide] gps_setup
 ---

+<!--
+SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Setting up GPS
-The @{gps} API allows computers and turtles to find their current position using wireless modems.
+The [`gps`] API allows computers and turtles to find their current position using wireless modems.

 In order to use GPS, you'll need to set up multiple *GPS hosts*. These are computers running the special `gps host`
 program, which tell other computers the host's position. Several hosts running together are known as a *GPS
@@ -13,22 +19,21 @@ In order to give the best results, a GPS constellation needs at least four compu
 constellation is redundant, but it does not cause problems.

 ## Building a GPS constellation
-![An example GPS constellation.](/images/gps-constellation-example.png){.big-image}
+<img alt="An example GPS constellation." src="/images/gps-constellation-example.png" class="big-image" />

 We are going to build our GPS constellation as shown in the image above. You will need 4 computers and either 4 wireless
 modems or 4 ender modems. Try not to mix ender and wireless modems together as you might get some odd behavior when your
 requesting computers are out of range.

-:::tip Ender modems vs wireless modems
-Ender modems have a very large range, which makes them very useful for setting up GPS hosts. If you do this then you
-will likely only need one GPS constellation for the whole dimension (such as the Overworld or Nether).
-
-If you do use wireless modems then you may find that you need multiple GPS constellations to cover your needs.
-
-A computer needs a wireless or ender modem and to be in range of a GPS constellation that is in the same dimension as it
-to use the GPS API. The reason for this is that ComputerCraft mimics real-life GPS by making use of the distance
-parameter of @{modem_message|modem messages} and some maths.
-:::
+> [Ender modems vs wireless modems][!TIP]
+> Ender modems have a very large range, which makes them very useful for setting up GPS hosts. If you do this then you
+> will likely only need one GPS constellation for the whole dimension (such as the Overworld or Nether).
+>
+> If you do use wireless modems then you may find that you need multiple GPS constellations to cover your needs.
+>
+> A computer needs a wireless or ender modem and to be in range of a GPS constellation that is in the same dimension as
+> it to use the GPS API. The reason for this is that ComputerCraft mimics real-life GPS by making use of the distance
+> parameter of [modem messages][`modem_message`] and some maths.

 Locate where you want to place your GPS constellation. You will need an area at least 6 blocks high, 6 blocks wide, and
 6 blocks deep (6x6x6). If you are using wireless modems then you may want to build your constellation as high as you can
@@ -73,18 +78,16 @@ To hide Minecraft's debug screen, press <kbd>F3</kbd> again.
 Create similar startup files for the other computers in your constellation, making sure to input the each computer's own
 coordinates.

-:::caution Modem messages come from the computer's position, not the modem's
-Wireless modems transmit from the block that they are attached to *not* the block space that they occupy, the
-coordinates that you input into your GPS host should be the position of the computer and not the position of the modem.
-:::
+> [Modem messages come from the computer's position, not the modem's][!WARNING]
+> Wireless modems transmit from the block that they are attached to *not* the block space that they occupy, the
+> coordinates that you input into your GPS host should be the position of the computer and not the position of the modem.

 Congratulations, your constellation is now fully set up! You can test it by placing another computer close by, placing a
-wireless modem on it, and running the `gps locate` program (or calling the @{gps.locate} function).
+wireless modem on it, and running the `gps locate` program (or calling the [`gps.locate`] function).

-:::info Why use Minecraft's coordinates?
-CC doesn't care if you use Minecraft's coordinate system, so long as all of the GPS hosts with overlapping ranges use
-the same reference point (requesting computers will get confused if hosts have different reference points). However,
-using MC's coordinate system does provide a nice standard to adopt server-wide. It also is consistent with how command
-computers get their location, they use MC's command system to get their block which returns that in MC's coordinate
-system.
-:::
+> [Why use Minecraft's coordinates?][!INFO]
+> CC doesn't care if you use Minecraft's coordinate system, so long as all of the GPS hosts with overlapping ranges use
+> the same reference point (requesting computers will get confused if hosts have different reference points). However,
+> using MC's coordinate system does provide a nice standard to adopt server-wide. It also is consistent with how command
+> computers get their location, they use MC's command system to get their block which returns that in MC's coordinate
+> system.
--- a/doc/guides/local_ips.md
+++ b/doc/guides/local_ips.md
@@ -2,6 +2,12 @@
 module: [kind=guide] local_ips
 ---

+<!--
+SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Allowing access to local IPs
 By default, ComputerCraft blocks access to local IP addresses for security. This means you can't normally access any
 HTTP server running on your computer. However, this may be useful for testing programs without having a remote
@@ -25,7 +31,7 @@ single-player or multiplayer. Look for lines that look like this:
 ```

 On 1.95.0 and later, this will be a single entry with `host = "$private"`. On earlier versions, this will be a number of
-`[[http.rules]]` with various IP addresses. You will want to remove all of the `[[http.rules]]` entires that have
+`[[http.rules]]` with various IP addresses. You will want to remove all of the `[[http.rules]]` entries that have
 `action = "deny"`. Then save the file and relaunch Minecraft (Server).

 Here's what it should look like after removing:
@@ -54,7 +60,7 @@ like this:
 ```toml
 #A list of wildcards for domains or IP ranges that cannot be accessed through the "http" API on Computers.
 #If this is empty then all whitelisted domains will be accessible. Example: "*.github.com" will block access to all subdomains of github.com.
-#You can use domain names ("pastebin.com"), wilcards ("*.pastebin.com") or CIDR notation ("127.0.0.0/8").
+#You can use domain names ("pastebin.com"), wildcards ("*.pastebin.com") or CIDR notation ("127.0.0.0/8").
 blacklist = ["127.0.0.0/8", "10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "fd00::/8"]
 ```

@@ -65,7 +71,7 @@ Here's what it should look like after removing:
 ```toml
 #A list of wildcards for domains or IP ranges that cannot be accessed through the "http" API on Computers.
 #If this is empty then all whitelisted domains will be accessible. Example: "*.github.com" will block access to all subdomains of github.com.
-#You can use domain names ("pastebin.com"), wilcards ("*.pastebin.com") or CIDR notation ("127.0.0.0/8").
+#You can use domain names ("pastebin.com"), wildcards ("*.pastebin.com") or CIDR notation ("127.0.0.0/8").
 blacklist = []
 ```

--- a/doc/guides/speaker_audio.md
+++ b/doc/guides/speaker_audio.md
@@ -4,8 +4,14 @@ see: speaker.playAudio Play PCM audio using a speaker.
 see: cc.audio.dfpwm Provides utilities for encoding and decoding DFPWM files.
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Playing audio with speakers
-CC: Tweaked's speaker peripheral provides a powerful way to play any audio you like with the @{speaker.playAudio}
+CC: Tweaked's speaker peripheral provides a powerful way to play any audio you like with the [`speaker.playAudio`]
 method. However, for people unfamiliar with digital audio, it's not the most intuitive thing to use. This guide provides
 an introduction to digital audio, demonstrates how to play music with CC: Tweaked's speakers, and then briefly discusses
 the more complex topic of audio processing.
@@ -54,7 +60,7 @@ sine waves (and why wouldn't you?), you'd need a table with almost 3 _million_.
 up very quickly, and these tables take up more and more memory.

 Instead of building our entire song (well, sine wave) in one go, we can produce it in small batches, each of which get
-passed off to @{speaker.playAudio} when the time is right. This allows us to build a _stream_ of audio, where we read
+passed off to [`speaker.playAudio`] when the time is right. This allows us to build a _stream_ of audio, where we read
 chunks of audio one at a time (either from a file or a tone generator like above), do some optional processing to each
 one, and then play them.

@@ -78,15 +84,15 @@ end
 ```

 It looks pretty similar to before, aside from we've wrapped the generation and playing code in a while loop, and added a
-rather odd loop with @{speaker.playAudio} and @{os.pullEvent}.
+rather odd loop with [`speaker.playAudio`] and [`os.pullEvent`].

-Let's talk about this loop, why do we need to keep calling @{speaker.playAudio}? Remember that what we're trying to do
+Let's talk about this loop, why do we need to keep calling [`speaker.playAudio`]? Remember that what we're trying to do
 here is avoid keeping too much audio in memory at once. However, if we're generating audio quicker than the speakers can
 play it, we're not helping at all - all this audio is still hanging around waiting to be played!

 In order to avoid this, the speaker rejects any new chunks of audio if its backlog is too large. When this happens,
-@{speaker.playAudio} returns false. Once enough audio has played, and the backlog has been reduced, a
-@{speaker_audio_empty} event is queued, and we can try to play our chunk once more.
+[`speaker.playAudio`] returns false. Once enough audio has played, and the backlog has been reduced, a
+[`speaker_audio_empty`] event is queued, and we can try to play our chunk once more.

 ## Storing audio
 PCM is a fantastic way of representing audio when we want to manipulate it, but it's not very efficient when we want to
@@ -100,7 +106,7 @@ computer. Instead, we need something much simpler.

 DFPWM (Dynamic Filter Pulse Width Modulation) is the de facto standard audio format of the ComputerCraft (and
 OpenComputers) world. Originally popularised by the addon mod [Computronics], CC:T now has built-in support for it with
-the @{cc.audio.dfpwm} module. This allows you to read DFPWM files from disk, decode them to PCM, and then play them
+the [`cc.audio.dfpwm`] module. This allows you to read DFPWM files from disk, decode them to PCM, and then play them
 using the speaker.

 Let's dive in with an example, and we'll explain things afterwards:
@@ -119,16 +125,16 @@ for chunk in io.lines("data/example.dfpwm", 16 * 1024) do
 end
 ```

-Once again, we see the @{speaker.playAudio}/@{speaker_audio_empty} loop. However, the rest of the program is a little
+Once again, we see the [`speaker.playAudio`]/[`speaker_audio_empty`] loop. However, the rest of the program is a little
 different.

-First, we require the dfpwm module and call @{cc.audio.dfpwm.make_decoder} to construct a new decoder. This decoder
+First, we require the dfpwm module and call [`cc.audio.dfpwm.make_decoder`] to construct a new decoder. This decoder
 accepts blocks of DFPWM data and converts it to a list of 8-bit amplitudes, which we can then play with our speaker.

-As mentioned above, @{speaker.playAudio} accepts at most 128×1024 samples in one go. DFPMW uses a single bit for each
+As mentioned above, [`speaker.playAudio`] accepts at most 128×1024 samples in one go. DFPMW uses a single bit for each
 sample, which means we want to process our audio in chunks of 16×1024 bytes (16KiB). In order to do this, we use
-@{io.lines}, which provides a nice way to loop over chunks of a file. You can of course just use @{fs.open} and
-@{fs.BinaryReadHandle.read} if you prefer.
+[`io.lines`], which provides a nice way to loop over chunks of a file. You can of course just use [`fs.open`] and
+[`fs.BinaryReadHandle.read`] if you prefer.

 ## Processing audio
 As mentioned near the beginning of this guide, PCM audio is pretty easy to work with as it's just a list of amplitudes.
@@ -183,10 +189,9 @@ for chunk in io.lines("data/example.dfpwm", 16 * 1024) do
 end
 ```

-:::note Confused?
-Don't worry if you don't understand this example. It's quite advanced, and does use some ideas that this guide doesn't
-cover. That said, don't be afraid to ask on [GitHub Discussions] or [IRC] either!
-:::
+> [Confused?][!NOTE]
+> Don't worry if you don't understand this example. It's quite advanced, and does use some ideas that this guide doesn't
+> cover. That said, don't be afraid to ask on [GitHub Discussions] or [IRC] either!

 It's worth noting that the examples of audio processing we've mentioned here are about manipulating the _amplitude_ of
 the wave. If you wanted to modify the _frequency_ (for instance, shifting the pitch), things get rather more complex.
--- a/doc/guides/using_require.md
+++ b/doc/guides/using_require.md
@@ -2,12 +2,18 @@
 module: [kind=guide] using_require
 ---

+<!--
+SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Reusing code with require
 A library is a collection of useful functions and other definitions which is stored separately to your main program. You
 might want to create a library because you have some functions which are used in multiple programs, or just to split
 your program into multiple more modular files.

-Let's say we want to create a small library to make working with the @{term|terminal} a little easier. We'll provide two
+Let's say we want to create a small library to make working with the [terminal][`term`] a little easier. We'll provide two
 functions: `reset`, which clears the terminal and sets the cursor to (1, 1), and `write_center`, which prints some text
 in the middle of the screen.

@@ -42,32 +48,32 @@ more_term.write_center("Hello, world!")
 When run, this'll clear the screen and print some text in the middle of the first line.

 ## require in depth
-While the previous section is a good introduction to how @{require} operates, there are a couple of remaining points
+While the previous section is a good introduction to how [`require`] operates, there are a couple of remaining points
 which are worth mentioning for more advanced usage.

 ### Libraries can return anything
 In our above example, we return a table containing the functions we want to expose. However, it's worth pointing out
-that you can return ''anything'' from your library - a table, a function or even just a string! @{require} treats them
+that you can return ''anything'' from your library - a table, a function or even just a string! [`require`] treats them
 all the same, and just returns whatever your library provides.

 ### Module resolution and the package path
-In the above examples, we defined our library in a file, and @{require} read from it. While this is what you'll do most
-of the time, it is possible to make @{require} look elsewhere for your library, such as downloading from a website or
+In the above examples, we defined our library in a file, and [`require`] read from it. While this is what you'll do most
+of the time, it is possible to make [`require`] look elsewhere for your library, such as downloading from a website or
 loading from an in-memory library store.

-As a result, the *module name* you pass to @{require} doesn't correspond to a file path. One common mistake is to load
+As a result, the *module name* you pass to [`require`] doesn't correspond to a file path. One common mistake is to load
 code from a sub-directory using `require("folder/library")` or even `require("folder/library.lua")`, neither of which
 will do quite what you expect.

-When loading libraries (also referred to as *modules*) from files, @{require} searches along the *@{package.path|module
-path}*. By default, this looks something like:
+When loading libraries (also referred to as *modules*) from files, [`require`] searches along the [*module
+path*][`package.path`]. By default, this looks something like:

 * `?.lua`
 * `?/init.lua`
 * `/rom/modules/main/?.lua`
 * etc...

-When you call `require("my_library")`, @{require} replaces the `?` in each element of the path with your module name, and
+When you call `require("my_library")`, [`require`] replaces the `?` in each element of the path with your module name, and
 checks if the file exists. In this case, we'd look for `my_library.lua`, `my_library/init.lua`,
 `/rom/modules/main/my_library.lua` and so on. Note that this works *relative to the current program*, so if your
 program is actually called `folder/program`, then we'll look for `folder/my_library.lua`, etc...
@@ -80,4 +86,4 @@ before we start looking for the library.
 There are several external resources which go into require in a little more detail:

 - The [Lua Module tutorial](http://lua-users.org/wiki/ModulesTutorial) on the Lua wiki.
- - [Lua's manual section on @{require}](https://www.lua.org/manual/5.1/manual.html#pdf-require).
+ - [Lua's manual section on `require`](https://www.lua.org/manual/5.1/manual.html#pdf-require).
--- a/doc/head.html
+++ b/doc/head.html
@@ -1 +1,7 @@
+<!--
+SPDX-FileCopyrightText: 2020 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 <meta name="theme-color" content="#c8d87c">
--- a/doc/index.md
+++ b/doc/index.md
@@ -1,21 +1,27 @@
+<!--
+SPDX-FileCopyrightText: 2020 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # ![CC: Tweaked](logo.png)
 CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles and more to the game. A fork of the
-much-beloved [ComputerCraft], it continues its legacy with better performance, stability, and a wealth of new features.
+much-beloved [ComputerCraft], it continues its legacy with improved performance and stability, along with a wealth of
+new features.

-CC: Tweaked can be installed from [CurseForge] or [Modrinth]. It requires the [Minecraft Forge][forge] mod loader, but
-[versions are available for Fabric][ccrestitched].
+CC: Tweaked can be installed from [CurseForge] or [Modrinth]. It runs on both [Minecraft Forge] and [Fabric].

 ## Features
 Controlled using the [Lua programming language][lua], CC: Tweaked's computers provides all the tools you need to start
 writing code and automating your Minecraft world.

-![A ComputerCraft terminal open and ready to be programmed.](images/basic-terminal.png){.big-image}
+<img alt="A ComputerCraft terminal open and ready to be programmed." src="images/basic-terminal.png" class="big-image" />

 While computers are incredibly powerful, they're rather limited by their inability to move about. *Turtles* are the
 solution here. They can move about the world, placing and breaking blocks, swinging a sword to protect you from zombies,
 or whatever else you program them to!

-![A turtle tunneling in Minecraft.](images/turtle.png){.big-image}
+<img alt="A turtle tunneling in Minecraft." src="images/turtle.png" class="big-image" />

 Not all problems can be solved with a pickaxe though, and so CC: Tweaked also provides a bunch of additional peripherals
 for your computers. You can play a tune with speakers, display text or images on a monitor, connect all your
@@ -24,7 +30,7 @@ computers together with modems, and much more.
 Computers can now also interact with inventories such as chests, allowing you to build complex inventory and item
 management systems.

-![A chest's contents being read by a computer and displayed on a monitor.](images/peripherals.png){.big-image}
+<img alt="A chest's contents being read by a computer and displayed on a monitor." src="images/peripherals.png" class="big-image" />

 ## Getting Started
 While ComputerCraft is lovely for both experienced programmers and for people who have never coded before, it can be a
@@ -48,7 +54,8 @@ CC: Tweaked lives on [GitHub]. If you've got any ideas, feedback or bugs please
 [curseforge]: https://minecraft.curseforge.com/projects/cc-tweaked "Download CC: Tweaked from CurseForge"
 [modrinth]: https://modrinth.com/mod/gu7yAYhd "Download CC: Tweaked from Modrinth"
 [forge]: https://files.minecraftforge.net/ "Download Minecraft Forge."
-[ccrestitched]: https://www.curseforge.com/minecraft/mc-mods/cc-restitched "Download CC: Restitched from CurseForge"
+[Minecraft Forge]: https://files.minecraftforge.net/ "Download Minecraft Forge."
+[Fabric]: https://fabricmc.net/use/installer/ "Download Fabric."
 [lua]: https://www.lua.org/ "Lua's main website"
 [GitHub Discussions]: https://github.com/cc-tweaked/CC-Tweaked/discussions
 [IRC]: https://webchat.esper.net/?channels=computercraft "#computercraft on EsperNet"
--- a/doc/logo-darkmode.png
+++ b/doc/logo-darkmode.png
--- a/doc/mod-page.md
+++ b/doc/mod-page.md
@@ -1,7 +1,11 @@
-# ![CC: Tweaked](https://tweaked.cc/logo.png)
-CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles and more to the game. A fork of the much-beloved [ComputerCraft], it continues its legacy with better performance, stability, and a wealth of new features.
+<!--
+SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers

-**Fabric support is added by the [CC: Restitched][ccrestitched] project**
+SPDX-License-Identifier: MPL-2.0
+-->
+
+# ![CC: Tweaked](https://tweaked.cc/logo.png)
+CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles and more to the game. A fork of the much-beloved [ComputerCraft], it continues its legacy with improved performance and stability, along with a wealth of new features.

 ## Testimonials

@@ -18,13 +22,13 @@ CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles an
 Controlled using the [Lua programming language][lua], CC: Tweaked's computers provides all the tools you need to start
 writing code and automating your Minecraft world.

-![A ComputerCraft terminal open and ready to be programmed.](https://tweaked.cc/images/basic-terminal.png)
+![A ComputerCraft terminal open and ready to be programmed.](https://raw.githubusercontent.com/cc-tweaked/CC-Tweaked/HEAD/doc/images/basic-terminal.png)

 While computers are incredibly powerful, they're rather limited by their inability to move about. *Turtles* are the
 solution here. They can move about the world, placing and breaking blocks, swinging a sword to protect you from zombies,
 or whatever else you program them to!

-![A turtle tunneling in Minecraft.](https://tweaked.cc/images/turtle.png)
+![A turtle tunneling in Minecraft.](https://raw.githubusercontent.com/cc-tweaked/CC-Tweaked/HEAD/doc/images/turtle.png)

 Not all problems can be solved with a pickaxe though, and so CC: Tweaked also provides a bunch of additional peripherals
 for your computers. You can play a tune with speakers, display text or images on a monitor, connect all your
@@ -33,7 +37,7 @@ computers together with modems, and much more.
 Computers can now also interact with inventories such as chests, allowing you to build complex inventory and item
 management systems.

-![A chest's contents being read by a computer and displayed on a monitor.](https://tweaked.cc/images/peripherals.png)
+![A chest's contents being read by a computer and displayed on a monitor.](https://raw.githubusercontent.com/cc-tweaked/CC-Tweaked/HEAD/doc/images/peripherals.png)

 ## Getting Started
 While ComputerCraft is lovely for both experienced programmers and for people who have never coded before, it can be a
@@ -54,8 +58,6 @@ CC: Tweaked lives on [GitHub]. If you've got any ideas, feedback or bugs please
 [github]: https://github.com/cc-tweaked/CC-Tweaked/ "CC: Tweaked on GitHub"
 [bug]: https://github.com/cc-tweaked/CC-Tweaked/issues/new/choose
 [computercraft]: https://github.com/dan200/ComputerCraft "ComputerCraft on GitHub"
-[forge]: https://files.minecraftforge.net/ "Download Minecraft Forge."
-[ccrestitched]: https://modrinth.com/mod/cc-restitched "Download CC: Restitched from Modrinth"
 [lua]: https://www.lua.org/ "Lua's main website"
 [GitHub Discussions]: https://github.com/cc-tweaked/CC-Tweaked/discussions
 [IRC]: http://webchat.esper.net/?channels=computercraft "#computercraft on EsperNet"
--- a/doc/reference/breaking_changes.md
+++ b/doc/reference/breaking_changes.md
@@ -0,0 +1,67 @@
+---
+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"
--- a/doc/reference/feature_compat.md
+++ b/doc/reference/feature_compat.md
@@ -2,6 +2,12 @@
 module: [kind=reference] feature_compat
 ---

+<!--
+SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0
+-->
+
 # Lua 5.2/5.3 features in CC: Tweaked
 CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However, Cobalt and CC:T implement additional features from Lua 5.2 and 5.3 (as well as some deprecated 5.0 features) that are not available in base 5.1. This page lists all of the compatibility for these newer versions.

@@ -15,7 +21,7 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | Hex literal fractional/exponent parts                         | ✔          |                                                                   |
 | Empty statements                                              | ❌         |                                                                   |
 | `__len` metamethod                                            | ✔          |                                                                   |
-| `__ipairs` metamethod                                         | ❌         |                                                                   |
+| `__ipairs` metamethod                                         | ❌         | Deprecated in Lua 5.3. `ipairs` uses `__len`/`__index` instead.   |
 | `__pairs` metamethod                                          | ✔          |                                                                   |
 | `bit32` library                                               | ✔          |                                                                   |
 | `collectgarbage` isrunning, generational, incremental options | ❌         | `collectgarbage` does not exist in CC:T.                          |
@@ -26,8 +32,8 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | `rawlen` function                                             | ✔          |                                                                   |
 | Negative index to `select`                                    | ✔          |                                                                   |
 | Removed `unpack`                                              | 🔶         | Only if `disable_lua51_features` is enabled in the configuration. |
-| Arguments to `xpcall`                                         | ❌         |                                                                   |
-| Second return value from `coroutine.running`                  | ❌         |                                                                   |
+| Arguments to `xpcall`                                         | ✔         |                                                                   |
+| Second return value from `coroutine.running`                  | ✔          |                                                                   |
 | Removed `module`                                              | ✔          |                                                                   |
 | `package.loaders` -> `package.searchers`                      | ❌         |                                                                   |
 | Second argument to loader functions                           | ✔          |                                                                   |
@@ -35,7 +41,7 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | `package.searchpath`                                          | ✔          |                                                                   |
 | Removed `package.seeall`                                      | ✔          |                                                                   |
 | `string.dump` on functions with upvalues (blanks them out)    | ✔          |                                                                   |
-| `string.rep` separator                                        | ❌         |                                                                   |
+| `string.rep` separator                                        | ✔         |                                                                   |
 | `%g` match group                                              | ❌         |                                                                   |
 | Removal of `%z` match group                                   | ❌         |                                                                   |
 | Removed `table.maxn`                                          | 🔶         | Only if `disable_lua51_features` is enabled in the configuration. |
@@ -58,7 +64,7 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | Removal of ambiguity error                                    | ❌         |                                                                   |
 | Identifiers may no longer use locale-dependent letters        | ✔          |                                                                   |
 | Ephemeron tables                                              | ❌         |                                                                   |
-| Identical functions may be reused                             | ❌         |                                                                   |
+| Identical functions may be reused                             | ❌         | Removed in Lua 5.4                                                |
 | Generational garbage collector                                | ❌         | Cobalt uses the built-in Java garbage collector.                  |

 ## Lua 5.3
@@ -69,10 +75,10 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | `\u{XXX}` escape sequence                                                             | ✔          |                           |
 | `utf8` library                                                                        | ✔          |                           |
 | removed `__ipairs` metamethod                                                         | ✔          |                           |
-| `coroutine.isyieldable`                                                               | ❌         |                           |
+| `coroutine.isyieldable`                                                               | ✔          |                           |
 | `string.dump` strip argument                                                          | ✔          |                           |
 | `string.pack`/`string.unpack`/`string.packsize`                                       | ✔          |                           |
-| `table.move`                                                                          | ❌         |                           |
+| `table.move`                                                                          | ✔          |                           |
 | `math.atan2` -> `math.atan`                                                           | ❌         |                           |
 | Removed `math.frexp`, `math.ldexp`, `math.pow`, `math.cosh`, `math.sinh`, `math.tanh` | ❌         |                           |
 | `math.maxinteger`/`math.mininteger`                                                   | ❌         |                           |
@@ -81,7 +87,7 @@ CC: Tweaked is based off of the Cobalt Lua runtime, which uses Lua 5.1. However,
 | `math.ult`                                                                            | ❌         |                           |
 | Removed `bit32` library                                                               | ❌         |                           |
 | Remove `*` from `file:read` modes                                                     | ✔          |                           |
-| Metamethods respected in `table.*`, `ipairs`                                          | 🔶         | Only `__lt` is respected. |
+| Metamethods respected in `table.*`, `ipairs`                                          | ✔          |                           |

 ## Lua 5.0
 | Feature                          | Supported? | Notes                                            |
--- a/Show More
+++ b/Show More