Bump CC:T to 1.115.1

I remembered to do this *before* the update! 🎉

.editorconfig

@@ -18,11 +18,6 @@ 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
 
@@ -31,3 +26,16 @@ indent_size = 2
 
 [*.yml]
 indent_size = 2
+
+[{*.kt,*.kts}]
+ij_kotlin_code_style_defaults = KOTLIN_OFFICIAL
+ij_kotlin_continuation_indent_size = 4
+ij_kotlin_spaces_around_equality_operators = true
+
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true
+
+# Prefer to handle these manually
+ij_kotlin_method_parameters_wrap = off
+ij_kotlin_call_parameters_wrap = off
+ij_kotlin_extends_list_wrap = off

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -1,12 +1,14 @@
 name: Bug report
 description: Report some misbehaviour in the mod
 labels: [ bug ]
+type: bug
 body:
 - type: dropdown
   id: mc-version
   attributes:
     label: Minecraft Version
-    description: What version of Minecraft are you using?
+    description: |
+        What version of Minecraft are you using? If your version is not listed, please try to reproduce on one of the supported versions.
     options:
       - 1.20.1
       - 1.21.x
@@ -26,8 +28,7 @@ body:
     label: Details
     description: |
       Description of the bug. Please include the following:
-      - Logs: These will be located in the `logs/` directory of your Minecraft
-        instance. Please upload them as a gist or directly into this editor.
-      - Detailed reproduction steps: sometimes I can spot a bug pretty easily,
-        but often it's much more obscure. The more information I have to help
-        reproduce it, the quicker it'll get fixed.
+      - Logs: These will be located in the `logs/` directory of your Minecraft instance. This is always useful, even if it doesn't include errors, so please upload this!
+      - Detailed reproduction steps: sometimes I can spot a bug pretty easily, but often it's much more obscure. The more information I have to help reproduce it, the quicker it'll get fixed.
+
+      ![A gif of burning text reading "Upload your logs!!!"](https://tweaked.cc/images/logs.gif)

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,6 +2,7 @@
 name: Feature request
 about: Suggest an idea or improvement
 labels: enhancement
+type: feature
 ---
 
 <!--

.github/workflows/main-ci.yml

@@ -14,7 +14,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 17
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle
@@ -30,27 +30,6 @@ jobs:
     - name: ⚒️ Build
       run: ./gradlew assemble || ./gradlew assemble
 
-    - name: 💡 Lint
-      uses: pre-commit/action@v3.0.0
-
-    - name: 🧪 Run tests
-      run: ./gradlew test validateMixinNames checkChangelog
-
-    - 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: 📦 Prepare Jars
       run: |
         # Find the main jar and append the git hash onto it.
@@ -63,8 +42,29 @@ jobs:
         name: CC-Tweaked
         path: ./jars
 
-    - name: 📤 Upload coverage
-      uses: codecov/codecov-action@v4
+    - name: Cache pre-commit
+      uses: actions/cache@v4
+      with:
+        path: ~/.cache/pre-commit
+        key: pre-commit-3|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}
+
+    - name: 💡 Lint
+      run: |
+        pipx install pre-commit
+        pre-commit run --show-diff-on-failure --color=always
+
+    - name: 🧪 Run tests
+      run: ./gradlew test validateMixinNames checkChangelog
+
+    - name: 📥 Download assets for game tests
+      run: ./gradlew downloadAssets || ./gradlew downloadAssets
+
+    - name: 🧪 Run integration tests
+      run: ./gradlew runGametest
+
+    - name: 🧪 Parse test reports
+      run: ./tools/parse-reports.py
+      if: ${{ failure() }}
 
   build-core:
     strategy:
@@ -87,7 +87,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 17
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle

.github/workflows/make-doc.yml

@@ -17,7 +17,7 @@ jobs:
     - name: 📥 Set up Java
       uses: actions/setup-java@v4
       with:
-        java-version: 21
+        java-version: 17
         distribution: 'temurin'
 
     - name: 📥 Setup Gradle

.gitignore

@@ -27,6 +27,7 @@
 *.iml
 .idea
 .gradle
+.kotlin
 *.DS_Store
 
 /.classpath

.pre-commit-config.yaml

@@ -6,7 +6,7 @@
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
-  rev: v4.4.0
+  rev: v5.0.0
   hooks:
   - id: trailing-whitespace
   - id: end-of-file-fixer
@@ -27,7 +27,7 @@ repos:
     exclude: "^(.*\\.(bat)|LICENSE)$"
 
 - repo: https://github.com/fsfe/reuse-tool
-  rev: v2.1.0
+  rev: v5.0.2
   hooks:
   - id: reuse
 
@@ -58,6 +58,7 @@ repos:
 exclude: |
   (?x)^(
     projects/[a-z]+/src/generated|
+    projects/[a-z]+/src/examples/generatedResources|
     projects/core/src/test/resources/test-rom/data/json-parsing/|
     .*\.dfpwm
   )

.reuse/dep5

@@ -1,100 +0,0 @@
-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_upgrade/*
-  projects/common/src/testMod/resources/data/cctest/structures/*
-  projects/*/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/forge/src/main/resources/computercraft.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

CONTRIBUTING.md

@@ -22,16 +22,15 @@ If you have a bug, suggestion, or other feedback, the best thing to do is [file
 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!
+Translations are managed through [CrowdIn], an online interface for managing language strings.
 
 ## Setting up a development environment
 In order to develop CC: Tweaked, you'll need to download the source code and then run it.
 
  - Make sure you've got the following software installed:
-   - Java Development Kit (JDK). This can be downloaded from [Adoptium].
+   - Java Development Kit 17 (JDK). This can be downloaded from [Adoptium].
    - [Git](https://git-scm.com/).
-   - [NodeJS][node].
+   - [NodeJS 20 or later][node].
 
  - Download CC: Tweaked's source code:
    ```
@@ -49,9 +48,12 @@ If you want to run CC:T in a normal Minecraft instance, run `./gradlew assemble`
 `projects/forge/build/libs` (for Forge) or `projects/fabric/build/libs` (for Fabric).
 
 ## 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]!
+Before making any major changes to CC: Tweaked, I'd recommend starting opening an issue or starting a discussion on
+GitHub first. It's often helpful to discuss features before spending time developing them!
+
+Once you're ready to start programming, 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]!
 
 ### Testing
 When making larger changes, it may be useful to write a test to make sure your code works as expected.
@@ -101,10 +103,10 @@ about how you can build on that until you've covered everything!
 [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"
 [ldoc]: http://stevedonovan.github.io/ldoc/ "ldoc, a Lua documentation generator."
 [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
+[Crowdin]: https://crowdin.com/project/cc-tweaked/

README.md

@@ -11,14 +11,13 @@ SPDX-License-Identifier: MPL-2.0
 </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 improved performance and stability, along with a wealth of
 new features.
 
-CC: Tweaked can be installed from [CurseForge] or [Modrinth]. It runs on both [Minecraft Forge] and [Fabric].
+CC: Tweaked can be installed from [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
@@ -26,8 +25,9 @@ developing the mod, [check out the instructions here](CONTRIBUTING.md#developing
 
 ## Community
 If you need help getting started with CC: Tweaked, want to show off your latest project, or just want to chat about
-ComputerCraft, do check out our [forum] and [GitHub discussions page][GitHub discussions]! There's also a fairly
-populated, albeit quiet [IRC channel][irc], if that's more your cup of tea.
+ComputerCraft, do check out our [GitHub discussions page][GitHub discussions]! There's also a fairly populated,
+albeit quiet IRC channel on [EsperNet], if that's more your cup of tea. You can join `#computercraft` through your
+desktop client, or online using [KiwiIRC].
 
 We also host fairly comprehensive documentation at [tweaked.cc](https://tweaked.cc/ "The CC: Tweaked website").
 
@@ -51,8 +51,9 @@ dependencies {
   compileOnly("cc.tweaked:cc-tweaked-$mcVersion-common-api:$cctVersion")
 
   // Forge Gradle
-  compileOnly("cc.tweaked:cc-tweaked-$mcVersion-forge-api:$cctVersion")
-  runtimeOnly("cc.tweaked:cc-tweaked-$mcVersion-forge:$cctVersion")
+  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")
@@ -60,19 +61,6 @@ dependencies {
 }
 ```
 
-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"
-        }
-    }
-}
-```
-
 You should also be careful to only use classes within the `dan200.computercraft.api` package. Non-API classes are
 subject to change at any point. If you depend on functionality outside the API (or need to mixin to CC:T), please file
 an issue to let me know!
@@ -81,10 +69,9 @@ We bundle the API sources with the jar, so documentation should be easily viewab
 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"
 [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"
+[EsperNet]: https://www.esper.net/
+[KiwiIRC]: https://kiwiirc.com/nextclient/#irc://irc.esper.net:+6697/#computercraft "#computercraft on EsperNet"

REUSE.toml

@@ -0,0 +1,100 @@
+# SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: MPL-2.0
+
+version = 1
+SPDX-PackageName = "CC: Tweaked"
+SPDX-PackageSupplier = "Jonathan Coates <git@squiddev.cc>"
+SPDX-PackageDownloadLocation = "https://github.com/cc-tweaked/cc-tweaked"
+
+[[annotations]]
+SPDX-FileCopyrightText = "The CC: Tweaked Developers"
+SPDX-License-Identifier = "CC0-1.0"
+path = [
+    # Generated/data files are CC0.
+    "gradle/gradle-daemon-jvm.properties",
+    "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/*/src/generated/**",
+    "projects/web/src/htmlTransform/export/index.json",
+    "projects/web/src/htmlTransform/export/items/minecraft/**",
+    # 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.
+    ".github/**",
+    # Example mod is CC0.
+    "projects/*/src/examples/**"
+]
+
+[[annotations]]
+# Several assets where it's inconvenient to create a .license file.
+SPDX-FileCopyrightText = "The CC: Tweaked Developers"
+SPDX-License-Identifier = "MPL-2.0"
+path = [
+    "doc/images/**",
+    "package.json",
+    "package-lock.json",
+    "projects/*/src/*/resources/*.mixins.json",
+    "projects/fabric/src/*/resources/fabric.mod.json",
+    "projects/common/src/main/resources/assets/minecraft/shaders/core/computercraft/monitor_tbo.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/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",
+]
+
+[[annotations]]
+# Bulk-license original assets as CCPL.
+SPDX-FileCopyrightText = "2011 Daniel Ratcliffe"
+SPDX-License-Identifier = "LicenseRef-CCPL"
+path = [
+    "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/**",
+]
+
+[[annotations]]
+# Community-contributed language files
+SPDX-FileCopyrightText = "2017 The CC: Tweaked Developers"
+SPDX-License-Identifier = "LicenseRef-CCPL"
+path = [
+    "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",
+]
+
+[[annotations]]
+# Community-contributed language files
+SPDX-FileCopyrightText = "2017 The CC: Tweaked Developers"
+SPDX-License-Identifier = "MPL-2.0"
+path = "projects/common/src/main/resources/assets/computercraft/lang/**"
+
+[[annotations]]
+path = ["gradle/wrapper/**"]
+SPDX-FileCopyrightText = "Gradle Inc"
+SPDX-License-Identifier = "Apache-2.0"
+
+[[annotations]]
+path = "projects/core/src/test/resources/test-rom/data/json-parsing/**"
+SPDX-FileCopyrightText = "2016 Nicolas Seriot"
+SPDX-License-Identifier = "MIT"

build.gradle.kts

@@ -24,21 +24,19 @@ val mcVersion: String by extra
 
 githubRelease {
     token(findProperty("githubApiKey") as String? ?: "")
-    owner.set("cc-tweaked")
-    repo.set("CC-Tweaked")
-    targetCommitish.set(cct.gitBranch)
+    owner = "cc-tweaked"
+    repo = "CC-Tweaked"
+    targetCommitish = cct.gitBranch
 
-    tagName.set("v$mcVersion-$modVersion")
-    releaseName.set("[$mcVersion] $modVersion")
-    body.set(
-        provider {
-            "## " + project(":core").file("src/main/resources/data/computercraft/lua/rom/help/whatsnew.md")
-                .readLines()
-                .takeWhile { it != "Type \"help changelog\" to see the full version history." }
-                .joinToString("\n").trim()
-        },
-    )
-    prerelease.set(isUnstable)
+    tagName = "v$mcVersion-$modVersion"
+    releaseName = "[$mcVersion] $modVersion"
+    body = provider {
+        "## " + 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 = isUnstable
 }
 
 tasks.publish { dependsOn(tasks.githubRelease) }
@@ -118,7 +116,7 @@ idea.project.settings.compiler.javac {
 }
 
 versionCatalogUpdate {
-    sortByKey.set(false)
+    sortByKey = false
     pin { versions.addAll("fastutil", "guava", "netty", "slf4j") }
-    keep { keepUnusedLibraries.set(true) }
+    keep { keepUnusedLibraries = true }
 }

buildSrc/build.gradle.kts

@@ -14,14 +14,10 @@ repositories {
     mavenCentral()
     gradlePluginPortal()
 
-    maven("https://maven.neoforged.net/releases") {
+    maven("https://maven.neoforged.net") {
         name = "NeoForge"
         content {
-            includeGroup("net.minecraftforge")
             includeGroup("net.neoforged")
-            includeGroup("net.neoforged.gradle")
-            includeModule("codechicken", "DiffPatch")
-            includeModule("net.covers1624", "Quack")
         }
     }
 
@@ -45,11 +41,10 @@ dependencies {
     implementation(libs.kotlin.plugin)
     implementation(libs.spotless)
 
-    implementation(libs.curseForgeGradle)
     implementation(libs.fabric.loom)
     implementation(libs.ideaExt)
     implementation(libs.minotaur)
-    implementation(libs.neoGradle.userdev)
+    implementation(libs.modDevGradle)
     implementation(libs.vanillaExtract)
 }
 
@@ -73,7 +68,7 @@ gradlePlugin {
 }
 
 versionCatalogUpdate {
-    sortByKey.set(false)
-    keep { keepUnusedLibraries.set(true) }
-    catalogFile.set(file("../gradle/libs.versions.toml"))
+    sortByKey = false
+    keep { keepUnusedLibraries = true }
+    catalogFile = file("../gradle/libs.versions.toml")
 }

buildSrc/src/main/kotlin/cc-tweaked.fabric.gradle.kts

@@ -30,7 +30,7 @@ repositories {
 
 loom {
     splitEnvironmentSourceSets()
-    splitModDependencies.set(true)
+    splitModDependencies = true
 }
 
 MinecraftConfigurations.setup(project)

buildSrc/src/main/kotlin/cc-tweaked.forge.gradle.kts

@@ -11,20 +11,18 @@ import cc.tweaked.gradle.MinecraftConfigurations
 
 plugins {
     id("cc-tweaked.java-convention")
-    id("net.neoforged.gradle.userdev")
+    id("net.neoforged.moddev.legacyforge")
 }
 
 plugins.apply(CCTweakedPlugin::class.java)
 
 val mcVersion: String by extra
 
-minecraft {
-    modIdentifier("computercraft")
-}
+legacyForge {
+    val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
+    version = "${mcVersion}-${libs.findVersion("forge").get()}"
 
-subsystems {
     parchment {
-        val libs = project.extensions.getByType<VersionCatalogsExtension>().named("libs")
         minecraftVersion = libs.findVersion("parchmentMc").get().toString()
         mappingsVersion = libs.findVersion("parchment").get().toString()
     }

buildSrc/src/main/kotlin/cc-tweaked.java-convention.gradle.kts

@@ -29,7 +29,7 @@ base.archivesName.convention("cc-tweaked-$mcVersion-${project.name}")
 
 java {
     toolchain {
-        languageVersion.set(CCTweakedPlugin.JAVA_VERSION)
+        languageVersion= CCTweakedPlugin.JAVA_VERSION
     }
 
     withSourcesJar()
@@ -47,6 +47,7 @@ repositories {
         filter {
             includeGroup("cc.tweaked")
             // Things we mirror
+            includeGroup("com.simibubi.create")
             includeGroup("commoble.morered")
             includeGroup("dev.architectury")
             includeGroup("dev.emi")
@@ -56,6 +57,7 @@ repositories {
             includeGroup("mezz.jei")
             includeGroup("org.teavm")
             includeModule("com.terraformersmc", "modmenu")
+            includeModule("me.lucko", "fabric-permissions-api")
         }
     }
 }
@@ -77,20 +79,11 @@ dependencies {
 // Configure default JavaCompile tasks with our arguments.
 sourceSets.all {
     tasks.named(compileJavaTaskName, JavaCompile::class.java) {
-
-        options.compilerArgs.addAll(
-            listOf(
-                "-Xlint",
-                // Processing just gives us "No processor claimed any of these annotations", so skip that!
-                "-Xlint:-processing",
-                // We violate this pattern too often for it to be a helpful warning. Something to improve one day!
-                "-Xlint:-this-escape",
-            ),
-        )
+        // 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)
@@ -98,6 +91,7 @@ sourceSets.all {
             check("OperatorPrecedence", CheckSeverity.OFF) // For now.
             check("NonOverridingEquals", CheckSeverity.OFF) // Peripheral.equals makes this hard to avoid
             check("FutureReturnValueIgnored", CheckSeverity.OFF) // Too many false positives with Netty
+            check("InvalidInlineTag", CheckSeverity.OFF) // Triggered by @snippet. Can be removed on Java 21.
 
             check("NullAway", CheckSeverity.ERROR)
             option(
@@ -154,7 +148,7 @@ tasks.javadoc {
     options {
         val stdOptions = this as StandardJavadocDocletOptions
         stdOptions.addBooleanOption("Xdoclint:all,-missing", true)
-        stdOptions.links("https://docs.oracle.com/en/java/javase/21/docs/api/")
+        stdOptions.links("https://docs.oracle.com/en/java/javase/17/docs/api/")
     }
 }
 
@@ -168,8 +162,8 @@ tasks.test {
 }
 
 tasks.withType(JacocoReport::class.java).configureEach {
-    reports.xml.required.set(true)
-    reports.html.required.set(true)
+    reports.xml.required = true
+    reports.html.required =true
 }
 
 project.plugins.withType(CCTweakedPlugin::class.java) {
@@ -225,6 +219,5 @@ idea.module {
 
     // 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
 }

buildSrc/src/main/kotlin/cc-tweaked.kotlin-convention.gradle.kts

@@ -1,25 +0,0 @@
-// 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
-
-plugins {
-    kotlin("jvm")
-}
-
-kotlin {
-    jvmToolchain {
-        languageVersion.set(CCTweakedPlugin.JAVA_VERSION)
-    }
-}
-
-tasks.withType(KotlinCompile::class.java).configureEach {
-    // So technically we shouldn't need to do this as the toolchain sets it above. However, the option only appears
-    // to be set when the task executes, so doesn't get picked up by IDEs.
-    kotlinOptions.jvmTarget = when {
-        CCTweakedPlugin.JAVA_VERSION.asInt() > 8 -> CCTweakedPlugin.JAVA_VERSION.toString()
-        else -> "1.${CCTweakedPlugin.JAVA_VERSION.asInt()}"
-    }
-}

buildSrc/src/main/kotlin/cc-tweaked.mod-publishing.gradle.kts

@@ -2,11 +2,9 @@
 //
 // 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")
 }
@@ -25,34 +23,17 @@ 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)
-    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")
+    token = findProperty("modrinthApiKey") as String? ?: ""
+    projectId = "gu7yAYhd"
+    versionNumber = modVersion
+    versionName = modVersion
+    versionType = 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).")
+    changelog = "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() })
+    syncBodyFrom = provider { rootProject.file("doc/mod-page.md").readText() }
 }
 
 tasks.publish { dependsOn(tasks.modrinth) }

buildSrc/src/main/kotlin/cc-tweaked.mod.gradle.kts

@@ -2,44 +2,34 @@
 //
 // SPDX-License-Identifier: MPL-2.0
 
-import cc.tweaked.gradle.clientClasses
-import cc.tweaked.gradle.commonClasses
-
 /**
  * Sets up the configurations for writing game tests.
  *
  * See notes in [cc.tweaked.gradle.MinecraftConfigurations] for the general design behind these cursed ideas.
  */
 
+import cc.tweaked.gradle.MinecraftConfigurations
+import cc.tweaked.gradle.clientClasses
+import cc.tweaked.gradle.commonClasses
+
 plugins {
-    id("cc-tweaked.kotlin-convention")
+    kotlin("jvm")
     id("cc-tweaked.java-convention")
 }
 
 val main = sourceSets["main"]
 val client = sourceSets["client"]
 
-// 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 + client.compileClasspath
-    runtimeClasspath += main.runtimeClasspath + client.runtimeClasspath
-}
+MinecraftConfigurations.createDerivedConfiguration(project, MinecraftConfigurations.DATAGEN)
+MinecraftConfigurations.createDerivedConfiguration(project, MinecraftConfigurations.EXAMPLES)
+MinecraftConfigurations.createDerivedConfiguration(project, MinecraftConfigurations.TEST_MOD)
 
-configurations {
-    named(testMod.compileClasspathConfigurationName) {
-        shouldResolveConsistentlyWith(compileClasspath.get())
-    }
+// Set up generated resources
+sourceSets.main { resources.srcDir("src/generated/resources") }
+sourceSets.named("examples") { resources.srcDir("src/examples/generatedResources") }
 
-    named(testMod.runtimeClasspathConfigurationName) {
-        shouldResolveConsistentlyWith(runtimeClasspath.get())
-    }
-}
-
-// 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)
-}
+// Make sure our examples compile.
+tasks.check { dependsOn(tasks.named("compileExamplesJava")) }
 
 // Similar to java-test-fixtures, but tries to avoid putting the obfuscated jar on the classpath.
 

buildSrc/src/main/kotlin/cc-tweaked.publishing.gradle.kts

@@ -12,25 +12,26 @@ publishing {
         register<MavenPublication>("maven") {
             artifactId = base.archivesName.get()
             from(components["java"])
+            suppressAllPomMetadataWarnings()
 
             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")
+                name = "CC: Tweaked"
+                description = "CC: Tweaked is a fork of ComputerCraft, adding programmable computers, turtles and more to Minecraft."
+                url = "https://github.com/cc-tweaked/CC-Tweaked"
 
                 scm {
-                    url.set("https://github.com/cc-tweaked/CC-Tweaked.git")
+                    url = "https://github.com/cc-tweaked/CC-Tweaked.git"
                 }
 
                 issueManagement {
-                    system.set("github")
-                    url.set("https://github.com/cc-tweaked/CC-Tweaked/issues")
+                    system = "github"
+                    url = "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")
+                        name = "ComputerCraft Public License, Version 1.0"
+                        url = "https://github.com/cc-tweaked/CC-Tweaked/blob/HEAD/LICENSE"
                     }
                 }
             }

buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedExtension.kt

@@ -10,23 +10,16 @@ import org.gradle.api.GradleException
 import org.gradle.api.NamedDomainObjectProvider
 import org.gradle.api.Project
 import org.gradle.api.Task
-import org.gradle.api.artifacts.Dependency
-import org.gradle.api.attributes.TestSuiteType
-import org.gradle.api.file.FileSystemOperations
 import org.gradle.api.plugins.JavaPluginExtension
-import org.gradle.api.provider.ListProperty
 import org.gradle.api.provider.Provider
 import org.gradle.api.provider.SetProperty
-import org.gradle.api.reporting.ReportingExtension
 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.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
@@ -37,54 +30,40 @@ import java.io.IOException
 import java.net.URI
 import java.util.regex.Pattern
 
-abstract class CCTweakedExtension(
-    private val project: Project,
-    private val fs: FileSystemOperations,
-) {
+abstract class CCTweakedExtension(private val project: Project) {
     /** Get the hash of the latest git commit. */
-    val gitHash: Provider<String> = gitProvider(project, "<no git hash>") {
-        ProcessHelpers.captureOut("git", "-C", project.rootProject.projectDir.absolutePath, "rev-parse", "HEAD").trim()
-    }
+    val gitHash: Provider<String> =
+        gitProvider("<no git commit>", listOf("rev-parse", "HEAD")) { it.trim() }
 
     /** Get the current git branch. */
-    val gitBranch: Provider<String> = gitProvider(project, "<no git branch>") {
-        ProcessHelpers.captureOut("git", "-C", project.rootProject.projectDir.absolutePath, "rev-parse", "--abbrev-ref", "HEAD")
-            .trim()
-    }
+    val gitBranch: Provider<String> =
+        gitProvider("<no git branch>", listOf("rev-parse", "--abbrev-ref", "HEAD")) { it.trim() }
 
     /** Get a list of all contributors to the project. */
-    val gitContributors: Provider<List<String>> = gitProvider(project, listOf()) {
-        ProcessHelpers.captureLines(
-            "git", "-C", project.rootProject.projectDir.absolutePath, "shortlog", "-ns",
-            "--group=author", "--group=trailer:co-authored-by", "HEAD",
-        )
-            .asSequence()
-            .map {
-                val matcher = COMMIT_COUNTS.matcher(it)
-                matcher.find()
-                matcher.group(1)
-            }
-            .filter { !IGNORED_USERS.contains(it) }
-            .toList()
-            .sortedWith(String.CASE_INSENSITIVE_ORDER)
-    }
+    val gitContributors: Provider<List<String>> =
+        gitProvider(listOf(), listOf("shortlog", "-ns", "--group=author", "--group=trailer:co-authored-by", "HEAD")) { input ->
+            input.lineSequence()
+                .filter { it.isNotEmpty() }
+                .map {
+                    val matcher = COMMIT_COUNTS.matcher(it)
+                    matcher.find()
+                    matcher.group(1)
+                }
+                .filter { !IGNORED_USERS.contains(it) }
+                .toList()
+                .sortedWith(String.CASE_INSENSITIVE_ORDER)
+        }
 
     /**
      * References to other sources
      */
     val sourceDirectories: SetProperty<SourceSetReference> = project.objects.setProperty(SourceSetReference::class.java)
 
-    /**
-     * Dependencies excluded from published artifacts.
-     */
-    private val excludedDeps: ListProperty<Dependency> = project.objects.listProperty(Dependency::class.java)
-
     /** All source sets referenced by this project. */
     val sourceSets = sourceDirectories.map { x -> x.map { it.sourceSet } }
 
     init {
         sourceDirectories.finalizeValueOnRead()
-        excludedDeps.finalizeValueOnRead()
         project.afterEvaluate { sourceDirectories.disallowChanges() }
     }
 
@@ -110,14 +89,13 @@ abstract class CCTweakedExtension(
         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)
+        for (sourceSet in listOf(MinecraftConfigurations.DATAGEN, MinecraftConfigurations.EXAMPLES, MinecraftConfigurations.TEST_MOD, "testFixtures")) {
+            otherJava.sourceSets.findByName(sourceSet)?.let { extendSourceSet(otherProject, it) }
+        }
 
         // The extra source-processing tasks should include these files too.
         project.tasks.named(main.javadocTaskName, Javadoc::class.java) { source(main.allJava, client.allJava) }
@@ -180,23 +158,19 @@ abstract class CCTweakedExtension(
     }
 
     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 reportTaskName = "jacoco${task.name.capitalise()}Report"
 
         val jacoco = project.extensions.getByType(JacocoPluginExtension::class.java)
         task.configure {
             finalizedBy(reportTaskName)
-
-            doFirst("Clean class dump directory") { fs.delete { delete(classDump) } }
-
             jacoco.applyTo(this)
+
             extensions.configure(JacocoTaskExtension::class.java) {
                 includes = listOf("dan200.computercraft.*")
-                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.
-                isIncludeNoLocationClasses = true
+                excludes = listOf(
+                    "dan200.computercraft.mixin.*", // Exclude mixins, as they're not executed at runtime.
+                    "dan200.computercraft.shared.Capabilities$*", // Exclude capability tokens, as Forge rewrites them.
+                )
             }
         }
 
@@ -205,15 +179,11 @@ abstract class CCTweakedExtension(
             description = "Generates code coverage report for the ${task.name} task."
 
             executionData(task.get())
-            classDirectories.from(classDump)
 
-            // Don't want to use sourceSets(...) here as we have a custom class directory.
-            for (ref in sourceSets.get()) sourceDirectories.from(ref.allSource.sourceDirectories)
-        }
-
-        project.extensions.configure(ReportingExtension::class.java) {
-            reports.register("${task.name}CodeCoverageReport", JacocoCoverageReport::class.java) {
-                testType.set(TestSuiteType.INTEGRATION_TEST)
+            // Don't want to use sourceSets(...) here as we don't use all class directories.
+            for (ref in this@CCTweakedExtension.sourceDirectories.get()) {
+                sourceDirectories.from(ref.sourceSet.allSource.sourceDirectories)
+                if (ref.classes) classDirectories.from(ref.sourceSet.output)
             }
         }
     }
@@ -253,40 +223,31 @@ abstract class CCTweakedExtension(
         ).resolve().single()
     }
 
-    /**
-     * Exclude a dependency from being published in Maven.
-     */
-    fun exclude(dep: Dependency) {
-        excludedDeps.add(dep)
-    }
+    private fun <T> gitProvider(default: T, command: List<String>, process: (String) -> T): Provider<T> {
+        val baseResult = project.providers.exec {
+            commandLine = listOf("git", "-C", project.rootDir.absolutePath) + command
+        }
 
-    /**
-     * Configure a [MavenDependencySpec].
-     */
-    fun configureExcludes(spec: MavenDependencySpec) {
-        for (dep in excludedDeps.get()) spec.exclude(dep)
+        return project.provider {
+            val res = try {
+                baseResult.standardOutput.asText.get()
+            } catch (e: IOException) {
+                project.logger.error("Cannot read Git repository: ${e.message}", e)
+                return@provider default
+            } catch (e: GradleException) {
+                project.logger.error("Cannot read Git repository: ${e.message}", e)
+                return@provider default
+            }
+            process(res)
+        }
     }
 
     companion object {
         private val COMMIT_COUNTS = Pattern.compile("""^\s*[0-9]+\s+(.*)$""")
         private val IGNORED_USERS = setOf(
-            "GitHub", "Daniel Ratcliffe", "Weblate",
+            "GitHub", "Daniel Ratcliffe", "NotSquidDev", "Weblate",
         )
 
-        private fun <T> gitProvider(project: Project, default: T, supplier: () -> T): Provider<T> {
-            return project.provider {
-                try {
-                    supplier()
-                } 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"))
     }

buildSrc/src/main/kotlin/cc/tweaked/gradle/CCTweakedPlugin.kt

@@ -42,6 +42,6 @@ class CCTweakedPlugin : Plugin<Project> {
     }
 
     companion object {
-        val JAVA_VERSION = JavaLanguageVersion.of(21)
+        val JAVA_VERSION = JavaLanguageVersion.of(17)
     }
 }

buildSrc/src/main/kotlin/cc/tweaked/gradle/DependencyCheck.kt

@@ -22,19 +22,19 @@ import org.gradle.language.base.plugins.LifecycleBasePlugin
 
 abstract class DependencyCheck : DefaultTask() {
     @get:Input
-    abstract val configuration: ListProperty<Configuration>
+    protected abstract val dependencies: ListProperty<DependencyResult>
 
     /**
      * A mapping of module coordinates (`group:module`) to versions, overriding the requested version.
      */
     @get:Input
-    abstract val overrides: MapProperty<String, String>
+    protected abstract val overrides: MapProperty<String, String>
 
     init {
         description = "Check :core's dependencies are consistent with Minecraft's."
         group = LifecycleBasePlugin.VERIFICATION_GROUP
 
-        configuration.finalizeValueOnRead()
+        dependencies.finalizeValueOnRead()
         overrides.finalizeValueOnRead()
     }
 
@@ -45,13 +45,19 @@ abstract class DependencyCheck : DefaultTask() {
         overrides.putAll(project.provider { mutableMapOf(module.get().module.toString() to version) })
     }
 
+    /**
+     * Add a configuration to check.
+     */
+    fun configuration(configuration: Provider<Configuration>) {
+        // We can't store the Configuration in the cache, so store the resolved dependencies instead.
+        dependencies.addAll(configuration.map { it.incoming.resolutionResult.allDependencies })
+    }
+
     @TaskAction
     fun run() {
         var ok = true
-        for (configuration in configuration.get()) {
-            configuration.incoming.resolutionResult.allDependencies {
-                if (!check(this@allDependencies)) ok = false
-            }
+        for (configuration in dependencies.get()) {
+            if (!check(configuration)) ok = false
         }
 
         if (!ok) {

buildSrc/src/main/kotlin/cc/tweaked/gradle/Extensions.kt

@@ -9,7 +9,6 @@ import org.gradle.api.file.FileSystemLocation
 import org.gradle.api.provider.Property
 import org.gradle.api.provider.Provider
 import org.gradle.api.tasks.JavaExec
-import org.gradle.kotlin.dsl.getByName
 import org.gradle.process.BaseExecSpec
 import org.gradle.process.JavaExecSpec
 import org.gradle.process.ProcessForkOptions
@@ -47,21 +46,6 @@ fun JavaExec.copyToFull(spec: JavaExec) {
     copyToExec(spec)
 }
 
-/**
- * Base this [JavaExec] task on an existing task.
- */
-fun JavaExec.copyFromTask(task: JavaExec) {
-    for (dep in task.dependsOn) dependsOn(dep)
-    task.copyToFull(this)
-}
-
-/**
- * Base this [JavaExec] task on an existing task.
- */
-fun JavaExec.copyFromTask(task: String) {
-    copyFromTask(project.tasks.getByName<JavaExec>(task))
-}
-
 /**
  * Copy additional [BaseExecSpec] options which aren't handled by [ProcessForkOptions.copyTo].
  */
@@ -159,7 +143,7 @@ fun getNextVersion(version: String): String {
     val lastIndex = mainVersion.lastIndexOf('.')
     if (lastIndex < 0) throw IllegalArgumentException("Cannot parse version format \"$version\"")
     val lastVersion = try {
-        version.substring(lastIndex + 1).toInt()
+        mainVersion.substring(lastIndex + 1).toInt()
     } catch (e: NumberFormatException) {
         throw IllegalArgumentException("Cannot parse version format \"$version\"", e)
     }
@@ -171,3 +155,15 @@ fun getNextVersion(version: String): String {
     if (dashIndex >= 0) out.append(version, dashIndex, version.length)
     return out.toString()
 }
+
+/**
+ * Capitalise the first letter of the string.
+ *
+ * This is a replacement for the now deprecated [String.capitalize].
+ */
+fun String.capitalise(): String {
+    if (isEmpty()) return this
+    val first = this[0]
+    val firstTitle = first.titlecaseChar()
+    return if (first == firstTitle) this else firstTitle + substring(1)
+}

buildSrc/src/main/kotlin/cc/tweaked/gradle/MavenDependencySpec.kt

@@ -1,73 +0,0 @@
-// 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.artifacts.ProjectDependency
-import org.gradle.api.plugins.BasePluginExtension
-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 {
-            // We have to cheat a little for project dependencies, as the project name doesn't match the artifact group.
-            val name = when (dep) {
-                is ProjectDependency -> dep.dependencyProject.extensions.getByType(BasePluginExtension::class.java).archivesName.get()
-                else -> dep.name
-            }
-            (dep.group.isNullOrEmpty() || dep.group == it.groupId) &&
-                (name.isNullOrEmpty() || 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)
-        }
-    }
-}

buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftConfigurations.kt

@@ -24,7 +24,6 @@ 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]
@@ -37,13 +36,7 @@ class MinecraftConfigurations private constructor(private val project: Project)
         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])
-        }
+        consistentWithMain(client)
 
         // Set up an API configuration for clients (to ensure it's consistent with the main source set).
         val clientApi = configurations.maybeCreate(client.apiConfigurationName).apply {
@@ -85,6 +78,16 @@ class MinecraftConfigurations private constructor(private val project: Project)
         setupBasic()
     }
 
+    private fun consistentWithMain(sourceSet: SourceSet) {
+        configurations.named(sourceSet.compileClasspathConfigurationName) {
+            shouldResolveConsistentlyWith(configurations[main.compileClasspathConfigurationName])
+        }
+
+        configurations.named(sourceSet.runtimeClasspathConfigurationName) {
+            shouldResolveConsistentlyWith(configurations[main.runtimeClasspathConfigurationName])
+        }
+    }
+
     private fun setupBasic() {
         val client = sourceSets["client"]
 
@@ -96,13 +99,30 @@ class MinecraftConfigurations private constructor(private val project: Project)
         val checkDependencyConsistency =
             project.tasks.register("checkDependencyConsistency", DependencyCheck::class.java) {
                 // We need to check both the main and client classpath *configurations*, as the actual configuration
-                configuration.add(configurations.named(main.runtimeClasspathConfigurationName))
-                configuration.add(configurations.named(client.runtimeClasspathConfigurationName))
+                configuration(configurations.named(main.runtimeClasspathConfigurationName))
+                configuration(configurations.named(client.runtimeClasspathConfigurationName))
             }
         project.tasks.named("check") { dependsOn(checkDependencyConsistency) }
     }
 
+    /**
+     * Create a new configuration that pulls in the main and client classes from the mod.
+     */
+    private fun createDerivedConfiguration(name: String) {
+        val client = sourceSets["client"]
+        val sourceSet = sourceSets.create(name)
+        sourceSet.compileClasspath += main.compileClasspath + client.compileClasspath
+        sourceSet.runtimeClasspath += main.runtimeClasspath + client.runtimeClasspath
+        consistentWithMain(sourceSet)
+        project.dependencies.add(sourceSet.implementationConfigurationName, main.output)
+        project.dependencies.add(sourceSet.implementationConfigurationName, client.output)
+    }
+
     companion object {
+        const val DATAGEN = "datagen"
+        const val EXAMPLES = "examples"
+        const val TEST_MOD = "testMod"
+
         fun setupBasic(project: Project) {
             MinecraftConfigurations(project).setupBasic()
         }
@@ -110,6 +130,10 @@ class MinecraftConfigurations private constructor(private val project: Project)
         fun setup(project: Project) {
             MinecraftConfigurations(project).setup()
         }
+
+        fun createDerivedConfiguration(project: Project, name: String) {
+            MinecraftConfigurations(project).createDerivedConfiguration(name)
+        }
     }
 }
 

buildSrc/src/main/kotlin/cc/tweaked/gradle/MinecraftExec.kt

@@ -4,6 +4,7 @@
 
 package cc.tweaked.gradle
 
+import net.neoforged.moddevgradle.internal.RunGameTask
 import org.gradle.api.GradleException
 import org.gradle.api.file.FileSystemOperations
 import org.gradle.api.invocation.Gradle
@@ -64,6 +65,22 @@ abstract class ClientJavaExec : JavaExec() {
         setTestProperties()
     }
 
+    fun copyFromForge(path: String) = copyFromForge(project.tasks.getByName(path, RunGameTask::class))
+
+    /**
+     * Set this task to run a given [RunGameTask].
+     */
+    fun copyFromForge(task: RunGameTask) {
+        copyFrom(task)
+
+        // Eagerly evaluate the behaviour of RunGameTask.exec
+        environment.putAll(task.environmentProperty.get())
+        classpath(task.classpathProvider)
+        workingDir = task.gameDirectory.get().asFile
+
+        setTestProperties() // setRunConfig may clobber some properties, ensure everything is set.
+    }
+
     /**
      * Copy configuration from a task with the given name.
      */

buildSrc/src/main/kotlin/cc/tweaked/gradle/Node.kt

@@ -11,7 +11,9 @@ import org.gradle.api.file.Directory
 import org.gradle.api.file.DirectoryProperty
 import org.gradle.api.provider.Provider
 import org.gradle.api.tasks.*
+import org.gradle.process.ExecOperations
 import java.io.File
+import javax.inject.Inject
 
 class NodePlugin : Plugin<Project> {
     override fun apply(project: Project) {
@@ -43,9 +45,12 @@ abstract class NpmInstall : DefaultTask() {
     @get:OutputDirectory
     val nodeModules: Provider<Directory> = projectRoot.dir("node_modules")
 
+    @get:Inject
+    protected abstract val execOperations: ExecOperations
+
     @TaskAction
     fun install() {
-        project.exec {
+        execOperations.exec {
             commandLine(ProcessHelpers.getExecutable("npm"), "ci")
             workingDir = projectRoot.get().asFile
         }

buildSrc/src/main/kotlin/cc/tweaked/gradle/ProcessHelpers.kt

@@ -4,45 +4,10 @@
 
 package cc.tweaked.gradle
 
-import org.codehaus.groovy.runtime.ProcessGroovyMethods
 import org.gradle.api.GradleException
-import java.io.BufferedReader
 import java.io.File
-import java.io.InputStreamReader
-import java.nio.charset.StandardCharsets
 
 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 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)
-        process.waitForOrThrow("Failed to run command")
-        return result
-    }
-
-    fun captureLines(vararg command: String): List<String> {
-        val process = startProcess(*command)
-        process.outputStream.close()
-
-        val out = BufferedReader(InputStreamReader(process.inputStream, StandardCharsets.UTF_8)).use { reader ->
-            reader.lines().filter { it.isNotEmpty() }.toList()
-        }
-        ProcessGroovyMethods.closeStreams(process)
-        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() }

config/checkstyle/checkstyle.xml

@@ -92,7 +92,10 @@ SPDX-License-Identifier: MPL-2.0
         <module name="InvalidJavadocPosition" />
         <module name="JavadocBlockTagLocation" />
         <module name="JavadocMethod"/>
-        <module name="JavadocType"/>
+        <module name="JavadocType">
+            <!-- Seems to complain about @hidden!? -->
+            <property name="allowUnknownTags" value="true" />
+        </module>
         <module name="JavadocStyle">
             <property name="checkHtml" value="false" />
         </module>
@@ -124,7 +127,7 @@ SPDX-License-Identifier: MPL-2.0
         </module>
         <module name="MethodTypeParameterName" />
         <module name="PackageName">
-            <property name="format" value="^(dan200\.computercraft|cc\.tweaked)(\.[a-z][a-z0-9]*)*" />
+            <property name="format" value="^(dan200\.computercraft|cc\.tweaked|com\.example\.examplemod)(\.[a-z][a-z0-9]*)*" />
         </module>
         <module name="ParameterName" />
         <module name="StaticVariableName">
@@ -143,7 +146,10 @@ SPDX-License-Identifier: MPL-2.0
         <module name="NoWhitespaceAfter">
             <property name="tokens" value="AT,INC,DEC,UNARY_MINUS,UNARY_PLUS,BNOT,LNOT,DOT,ARRAY_DECLARATOR,INDEX_OP,METHOD_REF" />
         </module>
-        <module name="NoWhitespaceBefore" />
+        <module name="NoWhitespaceBefore">
+            <!-- Allow whitespace before "..." for @Nullable annotations -->
+            <property name="tokens" value="COMMA,SEMI,POST_INC,POST_DEC,LABELED_STAT" />
+        </module>
         <!-- TODO: Decide on an OperatorWrap style. -->
         <module name="ParenPad" />
         <module name="SeparatorWrap">

config/checkstyle/suppressions.xml

@@ -22,7 +22,4 @@ SPDX-License-Identifier: MPL-2.0
 
     <!-- Allow underscores in our test classes. -->
     <suppress checks="MethodName" files=".*(Contract|Test).java" />
-
-    <!-- Allow underscores in Mixin classes -->
-    <suppress checks="TypeName" files=".*[\\/]mixin[\\/].*.java" />
 </suppressions>

crowdin.yml

@@ -0,0 +1,28 @@
+# SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+#
+# SPDX-License-Identifier: MPL-2.0
+
+files:
+  - source: projects/common/src/generated/resources/assets/computercraft/lang/en_us.json
+    translation: /projects/common/src/main/resources/assets/computercraft/lang/%locale_with_underscore%.json
+    languages_mapping:
+      locale_with_underscore:
+        cs: cs_cz    # Czech
+        da: da_dk    # Danish
+        de: de_de    # German
+        es-ES: es_es # Spanish
+        fr: fr_fr    # French
+        it: it_it    # Italian
+        ja: ja_jp    # Japanese
+        ko: ko_kr    # Korean
+        nb: nb_no    # Norwegian Bokmal
+        nl: nl_nl    # Dutch
+        pl: pl_pl    # Polish
+        pt-BR: pt_br # Portuguese, Brazilian
+        ru: ru_ru    # Russian
+        sv-SE: sv_se # Sweedish
+        tok: tok     # Toki Pona
+        tr: tr_tr    # Turkish
+        uk: uk_ua    # Ukraine
+        vi: vi_vn    # Vietnamese
+        zh-CN: zh_cn # Chinese Simplified

doc/events/monitor_resize.md

@@ -8,7 +8,7 @@ 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.
+The [`monitor_resize`] event is fired when an adjacent or networked [monitor's][`monitor`] size is changed.
 
 ## Return Values
 1. [`string`]: The event name.

doc/events/monitor_touch.md

@@ -8,7 +8,7 @@ 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.
+The [`monitor_touch`] event is fired when an adjacent or networked [Advanced Monitor][`monitor`] is right-clicked.
 
 ## Return Values
 1. [`string`]: The event name.

doc/events/redstone.md

@@ -8,7 +8,7 @@ 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.
+The [`event!redstone`] event is fired whenever any redstone inputs on the computer or [relay][`redstone_relay`] change.
 
 ## Return values
 1. [`string`]: The event name.
@@ -21,3 +21,7 @@ while true do
   print("A redstone input has changed!")
 end
 ```
+
+## See also
+ - [The `redstone` API on computers][`module!redstone`]
+ - [The `redstone_relay` peripheral][`redstone_relay`]

doc/guides/speaker_audio.md

@@ -191,7 +191,7 @@ end
 
 > [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!
+> cover. That said, don't be afraid to ask [the community for help][community].
 
 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.
@@ -205,5 +205,4 @@ This is, I'm afraid, left as an exercise to the reader.
 [PCM]: https://en.wikipedia.org/wiki/Pulse-code_modulation "Pulse-code Modulation - Wikipedia"
 [Ring Buffer]: https://en.wikipedia.org/wiki/Circular_buffer "Circular buffer - Wikipedia"
 [Sine Wave]: https://en.wikipedia.org/wiki/Sine_wave "Sine wave - Wikipedia"
-[GitHub Discussions]: https://github.com/cc-tweaked/CC-Tweaked/discussions
-[IRC]: https://webchat.esper.net/?channels=computercraft "#computercraft on EsperNet"
+[Community]: /#community

doc/index.md

@@ -16,7 +16,7 @@ CC: Tweaked is a mod for Minecraft which adds programmable computers, turtles an
 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 runs on both [Minecraft Forge] and [Fabric].
+CC: Tweaked can be installed from [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
@@ -50,7 +50,11 @@ little daunting getting started. Thankfully, there's several fantastic tutorials
 Once you're a little more familiar with the mod, the sidebar and links below provide more detailed documentation on the
 various APIs and peripherals provided by the mod.
 
-If you get stuck, do [ask a question on GitHub][GitHub Discussions] or pop in to the ComputerCraft's [IRC channel][IRC].
+<h2 id="community">Community</h2>
+If you need help getting started with CC: Tweaked, want to show off your latest project, or just want to chat about
+ComputerCraft, do check out our [GitHub discussions page][GitHub discussions]! There's also a fairly populated,
+albeit quiet IRC channel on [EsperNet], if that's more your cup of tea. You can join `#computercraft` through your
+desktop client, or online using [KiwiIRC].
 
 ## Get Involved
 CC: Tweaked lives on [GitHub]. If you've got any ideas, feedback or bugs please do [create an issue][bug].
@@ -58,11 +62,11 @@ 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"
-[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."
 [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"
+[EsperNet]: https://www.esper.net/
+[KiwiIRC]: https://kiwiirc.com/nextclient/#irc://irc.esper.net:+6697/#computercraft "#computercraft on EsperNet"

doc/mod-page.md

@@ -50,7 +50,11 @@ little daunting getting started. Thankfully, there's several fantastic tutorials
 Once you're a little more familiar with the mod, the [wiki](https://tweaked.cc/) provides more detailed documentation on the
 various APIs and peripherals provided by the mod.
 
-If you get stuck, do [ask a question on GitHub][GitHub Discussions] or pop in to the ComputerCraft's [IRC channel][IRC].
+## Community
+If you need help getting started with CC: Tweaked, want to show off your latest project, or just want to chat about
+ComputerCraft, do check out our [GitHub discussions page][GitHub discussions]! There's also a fairly populated,
+albeit quiet IRC channel on [EsperNet], if that's more your cup of tea. You can join `#computercraft` through your
+desktop client, or online using [KiwiIRC].
 
 ## Get Involved
 CC: Tweaked lives on [GitHub]. If you've got any ideas, feedback or bugs please do [create an issue][bug].
@@ -60,4 +64,5 @@ CC: Tweaked lives on [GitHub]. If you've got any ideas, feedback or bugs please
 [computercraft]: https://github.com/dan200/ComputerCraft "ComputerCraft on GitHub"
 [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"
+[EsperNet]: https://www.esper.net/
+[KiwiIRC]: https://kiwiirc.com/nextclient/#irc://irc.esper.net:+6697/#computercraft "#computercraft on EsperNet"

doc/reference/feature_compat.md

@@ -81,7 +81,7 @@ compatibility for these newer versions.
 | `string.dump` strip argument                                                          | ✔          |                           |
 | `string.pack`/`string.unpack`/`string.packsize`                                       | ✔          |                           |
 | `table.move`                                                                          | ✔          |                           |
-| `math.atan2` -> `math.atan`                                                           | ❌         |                           |
+| `math.atan2` -> `math.atan`                                                           | 🔶         | `math.atan` supports its two argument form. |
 | Removed `math.frexp`, `math.ldexp`, `math.pow`, `math.cosh`, `math.sinh`, `math.tanh` | ❌         |                           |
 | `math.maxinteger`/`math.mininteger`                                                   | ❌         |                           |
 | `math.tointeger`                                                                      | ❌         |                           |

gradle.properties

@@ -8,11 +8,9 @@ org.gradle.parallel=true
 kotlin.stdlib.default.dependency=false
 kotlin.jvm.target.validation.mode=error
 
-neogradle.subsystems.conventions.runs.enabled=false
-
 # Mod properties
-isUnstable=true
-modVersion=1.111.1
+isUnstable=false
+modVersion=1.115.1
 
 # Minecraft properties: We want to configure this here so we can read it in settings.gradle
-mcVersion=1.21
+mcVersion=1.20.1

gradle/gradle-daemon-jvm.properties

@@ -0,0 +1,2 @@
+#This file is generated by updateDaemonJvm
+toolchainVersion=17

gradle/libs.versions.toml

@@ -6,73 +6,75 @@
 
 # Minecraft
 # MC version is specified in gradle.properties, as we need that in settings.gradle.
-# Remember to update corresponding versions in fabric.mod.json/neoforge.mods.toml
-fabric-api = "0.100.3+1.21"
-fabric-loader = "0.15.11"
-neoForge = "21.0.42-beta"
-neoForgeSpi = "8.0.1"
+# Remember to update corresponding versions in fabric.mod.json/mods.toml
+fabric-api = "0.86.1+1.20.1"
+fabric-loader = "0.14.21"
+forge = "47.1.0"
+forgeSpi = "7.0.1"
 mixin = "0.8.5"
-parchment = "2024.06.16"
-parchmentMc = "1.20.6"
-yarn = "1.21+build.1"
+parchment = "2023.08.20"
+parchmentMc = "1.20.1"
+yarn = "1.20.1+build.10"
 
 # Core dependencies (these versions are tied to the version Minecraft uses)
-fastutil = "8.5.12"
-guava = "32.1.2-jre"
-netty = "4.1.97.Final"
-slf4j = "2.0.9"
+fastutil = "8.5.9"
+guava = "31.1-jre"
+netty = "4.1.82.Final"
+slf4j = "2.0.1"
 
 # Core dependencies (independent of Minecraft)
 asm = "9.6"
 autoService = "1.1.1"
 checkerFramework = "3.42.0"
-cobalt = { strictly = "0.9.3" }
+cobalt = { strictly = "0.9.5" }
 commonsCli = "1.6.0"
 jetbrainsAnnotations = "24.1.0"
-jsr305 = "3.0.2"
+jspecify = "1.0.0"
 jzlib = "1.1.3"
-kotlin = "1.9.21"
-kotlin-coroutines = "1.7.3"
-nightConfig = "3.6.7"
+kotlin = "2.1.10"
+kotlin-coroutines = "1.10.1"
+nightConfig = "3.8.1"
 
 # Minecraft mods
-emi = "1.1.7+1.21"
-fabricPermissions = "0.3.1"
-iris = "1.6.14+1.20.4"
-jei = "19.0.0.1"
-modmenu = "11.0.0-rc.4"
+emi = "1.0.8+1.20.1"
+fabricPermissions = "0.3.20230723"
+iris = "1.6.4+1.20"
+jei = "15.2.0.22"
+modmenu = "7.1.0"
 moreRed = "4.0.0.4"
 oculus = "1.2.5"
-rei = "16.0.729"
+rei = "12.0.626"
 rubidium = "0.6.1"
 sodium = "mc1.20-0.4.10"
-mixinExtra = "0.3.5"
+create-forge = "6.0.0-9"
+create-fabric = "0.5.1-f-build.1467+mc1.20.1"
 
 # Testing
 hamcrest = "2.2"
 jqwik = "1.8.2"
-junit = "5.10.1"
+junit = "5.11.4"
+junitPlatform = "1.11.4"
 jmh = "1.37"
 
 # Build tools
-cctJavadoc = "1.8.2"
-checkstyle = "10.14.1"
-curseForgeGradle = "1.1.18"
-errorProne-core = "2.27.0"
-errorProne-plugin = "3.1.0"
-fabric-loom = "1.7.1"
+cctJavadoc = "1.8.3"
+checkstyle = "10.21.2"
+errorProne-core = "2.36.0"
+errorProne-plugin = "4.1.0"
+fabric-loom = "1.9.2"
 githubRelease = "2.5.2"
 gradleVersions = "0.50.0"
 ideaExt = "1.1.7"
-illuaminate = "0.1.0-73-g43ee16c"
+illuaminate = "0.1.0-74-gf1551d5"
 lwjgl = "3.3.3"
 minotaur = "2.8.7"
-neoGradle = "7.0.152"
-nullAway = "0.10.25"
+modDevGradle = "2.0.74"
+nullAway = "0.12.3"
+shadow = "8.3.1"
 spotless = "6.23.3"
 taskTree = "2.1.1"
 teavm = "0.11.0-SQUID.1"
-vanillaExtract = "0.1.3"
+vanillaExtract = "0.2.0"
 versionCatalogUpdate = "0.8.1"
 
 [libraries]
@@ -84,33 +86,35 @@ checkerFramework = { module = "org.checkerframework:checker-qual", version.ref =
 cobalt = { module = "cc.tweaked:cobalt", version.ref = "cobalt" }
 commonsCli = { module = "commons-cli:commons-cli", version.ref = "commonsCli" }
 fastutil = { module = "it.unimi.dsi:fastutil", version.ref = "fastutil" }
-neoForgeSpi = { module = "net.neoforged:neoforgespi", version.ref = "neoForgeSpi" }
+forgeSpi = { module = "net.minecraftforge:forgespi", version.ref = "forgeSpi" }
 guava = { module = "com.google.guava:guava", version.ref = "guava" }
 jetbrainsAnnotations = { module = "org.jetbrains:annotations", version.ref = "jetbrainsAnnotations" }
-jsr305 = { module = "com.google.code.findbugs:jsr305", version.ref = "jsr305" }
+jspecify = { module = "org.jspecify:jspecify", version.ref = "jspecify" }
 jzlib = { module = "com.jcraft:jzlib", version.ref = "jzlib" }
 kotlin-coroutines = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlin-coroutines" }
 kotlin-platform = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlin" }
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
+netty-codec = { module = "io.netty:netty-codec", version.ref = "netty" }
 netty-http = { module = "io.netty:netty-codec-http", version.ref = "netty" }
-netty-socks = { module = "io.netty:netty-codec-socks", version.ref = "netty" }
 netty-proxy = { module = "io.netty:netty-handler-proxy", version.ref = "netty" }
+netty-socks = { module = "io.netty:netty-codec-socks", version.ref = "netty" }
 nightConfig-core = { module = "com.electronwill.night-config:core", version.ref = "nightConfig" }
 nightConfig-toml = { module = "com.electronwill.night-config:toml", version.ref = "nightConfig" }
 slf4j = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
 
 # Minecraft mods
-fabric-api = { module = "net.fabricmc.fabric-api:fabric-api", version.ref = "fabric-api" }
-fabric-loader = { module = "net.fabricmc:fabric-loader", version.ref = "fabric-loader" }
-fabric-junit = { module = "net.fabricmc:fabric-loader-junit", version.ref = "fabric-loader" }
-fabricPermissions = { module = "me.lucko:fabric-permissions-api", version.ref = "fabricPermissions" }
+create-fabric = { module = "com.simibubi.create:create-fabric-1.20.1", version.ref = "create-fabric" }
+create-forge = { module = "com.simibubi.create:create-1.20.1", version.ref = "create-forge" }
 emi = { module = "dev.emi:emi-xplat-mojmap", version.ref = "emi" }
+fabric-api = { module = "net.fabricmc.fabric-api:fabric-api", version.ref = "fabric-api" }
+fabric-junit = { module = "net.fabricmc:fabric-loader-junit", version.ref = "fabric-loader" }
+fabric-loader = { module = "net.fabricmc:fabric-loader", version.ref = "fabric-loader" }
+fabricPermissions = { module = "me.lucko:fabric-permissions-api", version.ref = "fabricPermissions" }
 iris = { module = "maven.modrinth:iris", version.ref = "iris" }
-jei-api = { module = "mezz.jei:jei-1.21-common-api", version.ref = "jei" }
-jei-fabric = { module = "mezz.jei:jei-1.21-fabric", version.ref = "jei" }
-jei-forge = { module = "mezz.jei:jei-1.21-neoforge", version.ref = "jei" }
+jei-api = { module = "mezz.jei:jei-1.20.1-common-api", version.ref = "jei" }
+jei-fabric = { module = "mezz.jei:jei-1.20.1-fabric", version.ref = "jei" }
+jei-forge = { module = "mezz.jei:jei-1.20.1-forge", version.ref = "jei" }
 mixin = { module = "org.spongepowered:mixin", version.ref = "mixin" }
-mixinExtra = { module = "io.github.llamalad7:mixinextras-common", version.ref = "mixinExtra" }
 modmenu = { module = "com.terraformersmc:modmenu", version.ref = "modmenu" }
 moreRed = { module = "commoble.morered:morered-1.20.1", version.ref = "moreRed" }
 oculus = { module = "maven.modrinth:oculus", version.ref = "oculus" }
@@ -127,6 +131,7 @@ jqwik-engine = { module = "net.jqwik:jqwik-engine", version.ref = "jqwik" }
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
 junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
 junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junit" }
+junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junitPlatform" }
 slf4j-simple = { module = "org.slf4j:slf4j-simple", version.ref = "slf4j" }
 jmh = { module = "org.openjdk.jmh:jmh-core", version.ref = "jmh" }
 jmh-processor = { module = "org.openjdk.jmh:jmh-generator-annprocess", version.ref = "jmh" }
@@ -140,7 +145,6 @@ lwjgl-glfw = { module = "org.lwjgl:lwjgl-glfw" }
 # Build tools
 cctJavadoc = { module = "cc.tweaked:cct-javadoc", version.ref = "cctJavadoc" }
 checkstyle = { module = "com.puppycrawl.tools:checkstyle", version.ref = "checkstyle" }
-curseForgeGradle = { module = "net.darkhax.curseforgegradle:CurseForgeGradle", version.ref = "curseForgeGradle" }
 errorProne-annotations = { module = "com.google.errorprone:error_prone_annotations", version.ref = "errorProne-core" }
 errorProne-api = { module = "com.google.errorprone:error_prone_check_api", version.ref = "errorProne-core" }
 errorProne-core = { module = "com.google.errorprone:error_prone_core", version.ref = "errorProne-core" }
@@ -150,8 +154,8 @@ fabric-loom = { module = "net.fabricmc:fabric-loom", version.ref = "fabric-loom"
 ideaExt = { module = "gradle.plugin.org.jetbrains.gradle.plugin.idea-ext:gradle-idea-ext", version.ref = "ideaExt" }
 kotlin-plugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 minotaur = { module = "com.modrinth.minotaur:Minotaur", version.ref = "minotaur" }
-neoGradle-userdev = { module = "net.neoforged.gradle:userdev", version.ref = "neoGradle" }
 nullAway = { module = "com.uber.nullaway:nullaway", version.ref = "nullAway" }
+modDevGradle = { module = "net.neoforged:moddev-gradle", version.ref = "modDevGradle" }
 spotless = { module = "com.diffplug.spotless:spotless-plugin-gradle", version.ref = "spotless" }
 teavm-classlib = { module = "org.teavm:teavm-classlib", version.ref = "teavm" }
 teavm-core = { module = "org.teavm:teavm-core", version.ref = "teavm" }
@@ -169,11 +173,12 @@ yarn = { module = "net.fabricmc:yarn", version.ref = "yarn" }
 githubRelease = { id = "com.github.breadmoirai.github-release", version.ref = "githubRelease" }
 gradleVersions = { id = "com.github.ben-manes.versions", version.ref = "gradleVersions" }
 kotlin = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
+shadow = { id = "com.gradleup.shadow", version.ref = "shadow" }
 taskTree = { id = "com.dorongold.task-tree", version.ref = "taskTree" }
 versionCatalogUpdate = { id = "nl.littlerobots.version-catalog-update", version.ref = "versionCatalogUpdate" }
 
 [bundles]
-annotations = ["jsr305", "checkerFramework", "jetbrainsAnnotations"]
+annotations = ["checkerFramework", "jetbrainsAnnotations", "jspecify"]
 kotlin = ["kotlin-stdlib", "kotlin-coroutines"]
 
 # Minecraft
@@ -185,7 +190,7 @@ externalMods-fabric-runtime = ["jei-fabric", "modmenu"]
 
 # Testing
 test = ["junit-jupiter-api", "junit-jupiter-params", "hamcrest", "jqwik-api"]
-testRuntime = ["junit-jupiter-engine", "jqwik-engine"]
+testRuntime = ["junit-jupiter-engine", "junit-platform-launcher", "jqwik-engine"]
 
 # Build tools
 teavm-api = ["teavm-jso", "teavm-jso-apis", "teavm-platform", "teavm-classlib", "teavm-metaprogramming-api"]

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -84,7 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################

package.json

@@ -13,10 +13,10 @@
   },
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^15.2.1",
-    "@rollup/plugin-typescript": "^11.0.0",
+    "@rollup/plugin-typescript": "^12.0.0",
     "@rollup/plugin-url": "^8.0.1",
     "@swc/core": "^1.3.92",
-    "@types/node": "^20.8.3",
+    "@types/node": "^22.0.0",
     "lightningcss": "^1.22.0",
     "preact-render-to-string": "^6.2.1",
     "rehype": "^13.0.0",

projects/common-api/build.gradle.kts

@@ -8,6 +8,8 @@ plugins {
     id("cc-tweaked.vanilla")
 }
 
+val mcVersion: String by extra
+
 java {
     withJavadocJar()
 }
@@ -16,14 +18,42 @@ dependencies {
     api(project(":core-api"))
 }
 
+val javadocOverview by tasks.registering(Copy::class) {
+    from("src/overview.html")
+    into(layout.buildDirectory.dir(name))
+
+    expand(
+        mapOf(
+            "mcVersion" to mcVersion,
+            "modVersion" to version,
+        ),
+    )
+}
+
 tasks.javadoc {
+    title = "CC: Tweaked $version for Minecraft $mcVersion"
     include("dan200/computercraft/api/**/*.java")
 
-    // Include the core-api in our javadoc export. This is wrong, but it means we can export a single javadoc dump.
-    source(project(":core-api").sourceSets.main.map { it.allJava })
-
     options {
-        this as StandardJavadocDocletOptions
+        (this as StandardJavadocDocletOptions)
+
+        inputs.files(javadocOverview)
+        overview(javadocOverview.get().destinationDir.resolve("overview.html").absolutePath)
+
+        groups = mapOf(
+            "Common" to listOf(
+                "dan200.computercraft.api",
+                "dan200.computercraft.api.lua",
+                "dan200.computercraft.api.peripheral",
+            ),
+            "Upgrades" to listOf(
+                "dan200.computercraft.api.client.turtle",
+                "dan200.computercraft.api.pocket",
+                "dan200.computercraft.api.turtle",
+                "dan200.computercraft.api.upgrades",
+            ),
+        )
+
         addBooleanOption("-allow-script-in-comments", true)
         bottom(
             """
@@ -32,5 +62,17 @@ tasks.javadoc {
             <link href=" https://cdn.jsdelivr.net/npm/prismjs@1.29.0/themes/prism.min.css " rel="stylesheet">
             """.trimIndent(),
         )
+
+        taglets("cc.tweaked.javadoc.SnippetTaglet")
+        tagletPath(configurations.detachedConfiguration(dependencies.project(":lints")).toList())
+
+        val snippetSources = listOf(":common", ":fabric", ":forge").flatMap {
+            project(it).sourceSets["examples"].allSource.sourceDirectories
+        }
+        inputs.files(snippetSources)
+        jFlags("-Dcc.snippet-path=" + snippetSources.joinToString(File.pathSeparator) { it.absolutePath })
     }
+
+    // Include the core-api in our javadoc export. This is wrong, but it means we can export a single javadoc dump.
+    source(project(":core-api").sourceSets.main.map { it.allJava })
 }

projects/common-api/src/client/java/dan200/computercraft/api/client/ComputerCraftAPIClient.java

@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.client;
+
+import dan200.computercraft.api.client.turtle.TurtleUpgradeModeller;
+import dan200.computercraft.api.turtle.ITurtleUpgrade;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
+import dan200.computercraft.impl.client.ComputerCraftAPIClientService;
+
+/**
+ * The public API for client-only code.
+ *
+ * @see dan200.computercraft.api.ComputerCraftAPI The main API
+ */
+public final class ComputerCraftAPIClient {
+    private ComputerCraftAPIClient() {
+    }
+
+    /**
+     * Register a {@link TurtleUpgradeModeller} for a class of turtle upgrades.
+     * <p>
+     * This may be called at any point after registry creation, though it is recommended to call it within your client
+     * setup step.
+     *
+     * @param serialiser The turtle upgrade serialiser.
+     * @param modeller   The upgrade modeller.
+     * @param <T>        The type of the turtle upgrade.
+     * @deprecated This method can lead to confusing load behaviour on Forge. Use
+     * {@code dan200.computercraft.api.client.FabricComputerCraftAPIClient#registerTurtleUpgradeModeller} on Fabric, or
+     * {@code dan200.computercraft.api.client.turtle.RegisterTurtleModellersEvent} on Forge.
+     */
+    @Deprecated(forRemoval = true)
+    public static <T extends ITurtleUpgrade> void registerTurtleUpgradeModeller(TurtleUpgradeSerialiser<T> serialiser, TurtleUpgradeModeller<T> modeller) {
+        // TODO(1.20.4): Remove this
+        getInstance().registerTurtleUpgradeModeller(serialiser, modeller);
+    }
+
+    private static ComputerCraftAPIClientService getInstance() {
+        return ComputerCraftAPIClientService.get();
+    }
+}

projects/common-api/src/client/java/dan200/computercraft/api/client/ModelLocation.java

@@ -1,84 +0,0 @@
-// SPDX-FileCopyrightText: 2024 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.api.client;
-
-import dan200.computercraft.api.client.turtle.TurtleUpgradeModeller;
-import dan200.computercraft.impl.client.ClientPlatformHelper;
-import net.minecraft.client.resources.model.BakedModel;
-import net.minecraft.client.resources.model.ModelManager;
-import net.minecraft.client.resources.model.ModelResourceLocation;
-import net.minecraft.resources.ResourceLocation;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.stream.Stream;
-
-/**
- * The location of a model to load. This may either be:
- *
- * <ul>
- *     <li>A {@link ModelResourceLocation}, referencing an already baked model (such as {@code minecraft:dirt#inventory}).</li>
- *     <li>
- *         A {@link ResourceLocation}, referencing a path to a model resource (such as {@code minecraft:item/dirt}.
- *         These models will be baked and stored in the {@link ModelManager} in a loader-specific way.
- *     </li>
- * </ul>
- */
-public final class ModelLocation {
-    /**
-     * The location of the model.
-     * <p>
-     * When {@link #resourceLocation} is null, this is the location of the model to load. When {@link #resourceLocation}
-     * is non-null, this is the "standalone" variant of the model resource — this is used by NeoForge's implementation
-     * of {@link ClientPlatformHelper#getModel(ModelManager, ModelResourceLocation, ResourceLocation)} to fetch the
-     * model from the model manger. It is not used on Fabric.
-     */
-    private final ModelResourceLocation modelLocation;
-    private final @Nullable ResourceLocation resourceLocation;
-
-    private ModelLocation(ModelResourceLocation modelLocation, @Nullable ResourceLocation resourceLocation) {
-        this.modelLocation = modelLocation;
-        this.resourceLocation = resourceLocation;
-    }
-
-    /**
-     * Create a {@link ModelLocation} from model in the model manager.
-     *
-     * @param location The name of the model to load.
-     * @return The new {@link ModelLocation} instance.
-     */
-    public static ModelLocation ofModel(ModelResourceLocation location) {
-        return new ModelLocation(location, null);
-    }
-
-    /**
-     * Create a {@link ModelLocation} from a resource.
-     *
-     * @param location The location of the model resource, such as {@code minecraft:item/dirt}.
-     * @return The new {@link ModelLocation} instance.
-     */
-    public static ModelLocation ofResource(ResourceLocation location) {
-        return new ModelLocation(new ModelResourceLocation(location, "standalone"), location);
-    }
-
-    /**
-     * Get this model from the provided model manager.
-     *
-     * @param manager The model manger.
-     * @return This model, or the missing model if it could not be found.
-     */
-    public BakedModel getModel(ModelManager manager) {
-        return ClientPlatformHelper.get().getModel(manager, modelLocation, resourceLocation);
-    }
-
-    /**
-     * Get the models this model location depends on.
-     *
-     * @return A list of models that this model location depends on.
-     * @see TurtleUpgradeModeller#getDependencies()
-     */
-    public Stream<ResourceLocation> getDependencies() {
-        return resourceLocation == null ? Stream.empty() : Stream.of(resourceLocation);
-    }
-}

projects/common-api/src/client/java/dan200/computercraft/api/client/TransformedModel.java

@@ -13,47 +13,30 @@ import net.minecraft.client.resources.model.ModelResourceLocation;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 
+import java.util.Objects;
+
 /**
  * A model to render, combined with a transformation matrix to apply.
- *
- * @param model  The model.
- * @param matrix The transformation matrix.
  */
-public record TransformedModel(BakedModel model, Transformation matrix) {
+public final class TransformedModel {
+    private final BakedModel model;
+    private final Transformation matrix;
+
+    public TransformedModel(BakedModel model, Transformation matrix) {
+        this.model = Objects.requireNonNull(model);
+        this.matrix = Objects.requireNonNull(matrix);
+    }
+
     public TransformedModel(BakedModel model) {
-        this(model, Transformation.identity());
+        this.model = Objects.requireNonNull(model);
+        matrix = Transformation.identity();
     }
 
-    /**
-     * Look up a model in the model bakery and construct a {@link TransformedModel} with no transformation.
-     *
-     * @param location The location of the model to load.
-     * @return The new {@link TransformedModel} instance.
-     */
-    public static TransformedModel of(ModelLocation location) {
-        var modelManager = Minecraft.getInstance().getModelManager();
-        return new TransformedModel(location.getModel(modelManager));
-    }
-
-    /**
-     * Look up a model in the model bakery and construct a {@link TransformedModel} with no transformation.
-     *
-     * @param location The location of the model to load.
-     * @return The new {@link TransformedModel} instance.
-     * @see ModelLocation#ofModel(ModelResourceLocation)
-     */
     public static TransformedModel of(ModelResourceLocation location) {
         var modelManager = Minecraft.getInstance().getModelManager();
         return new TransformedModel(modelManager.getModel(location));
     }
 
-    /**
-     * Look up a model in the model bakery and construct a {@link TransformedModel} with no transformation.
-     *
-     * @param location The location of the model to load.
-     * @return The new {@link TransformedModel} instance.
-     * @see ModelLocation#ofResource(ResourceLocation)
-     */
     public static TransformedModel of(ResourceLocation location) {
         var modelManager = Minecraft.getInstance().getModelManager();
         return new TransformedModel(ClientPlatformHelper.get().getModel(modelManager, location));
@@ -63,4 +46,12 @@ public record TransformedModel(BakedModel model, Transformation matrix) {
         var model = Minecraft.getInstance().getItemRenderer().getItemModelShaper().getItemModel(item);
         return new TransformedModel(model, transform);
     }
+
+    public BakedModel getModel() {
+        return model;
+    }
+
+    public Transformation getMatrix() {
+        return matrix;
+    }
 }

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/RegisterTurtleUpgradeModeller.java

@@ -5,7 +5,7 @@
 package dan200.computercraft.api.client.turtle;
 
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
-import dan200.computercraft.api.upgrades.UpgradeType;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
 
 /**
  * A functional interface to register a {@link TurtleUpgradeModeller} for a class of turtle upgrades.
@@ -18,9 +18,9 @@ public interface RegisterTurtleUpgradeModeller {
     /**
      * Register a {@link TurtleUpgradeModeller}.
      *
-     * @param type     The turtle upgrade type.
-     * @param modeller The upgrade modeller.
-     * @param <T>      The type of the turtle upgrade.
+     * @param serialiser The turtle upgrade serialiser.
+     * @param modeller   The upgrade modeller.
+     * @param <T>        The type of the turtle upgrade.
      */
-    <T extends ITurtleUpgrade> void register(UpgradeType<T> type, TurtleUpgradeModeller<T> modeller);
+    <T extends ITurtleUpgrade> void register(TurtleUpgradeSerialiser<T> serialiser, TurtleUpgradeModeller<T> modeller);
 }

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/TurtleUpgradeModeller.java

@@ -4,24 +4,32 @@
 
 package dan200.computercraft.api.client.turtle;
 
-import dan200.computercraft.api.client.ModelLocation;
 import dan200.computercraft.api.client.TransformedModel;
 import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
+import net.minecraft.client.resources.model.ModelResourceLocation;
 import net.minecraft.client.resources.model.UnbakedModel;
-import net.minecraft.core.component.DataComponentPatch;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.resources.ResourceLocation;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
-import java.util.stream.Stream;
+import java.util.Collection;
+import java.util.List;
 
 /**
  * Provides models for a {@link ITurtleUpgrade}.
  * <p>
  * Use {@code dan200.computercraft.api.client.FabricComputerCraftAPIClient#registerTurtleUpgradeModeller} to register a
  * modeller on Fabric and {@code dan200.computercraft.api.client.turtle.RegisterTurtleModellersEvent} to register one
- * on Forge
+ * on Forge.
+ *
+ * <h2>Example</h2>
+ * <h3>Fabric</h3>
+ * {@snippet class=com.example.examplemod.FabricExampleModClient region=turtle_modellers}
+ *
+ * <h3>Forge</h3>
+ * {@snippet class=com.example.examplemod.FabricExampleModClient region=turtle_modellers}
  *
  * @param <T> The type of turtle upgrade this modeller applies to.
  * @see RegisterTurtleUpgradeModeller For multi-loader registration support.
@@ -30,32 +38,47 @@ public interface TurtleUpgradeModeller<T extends ITurtleUpgrade> {
     /**
      * Obtain the model to be used when rendering a turtle peripheral.
      * <p>
-     * When the current turtle is {@literal null}, this function should be constant for a given upgrade, side and data.
+     * When the current turtle is {@literal null}, this function should be constant for a given upgrade and side.
      *
      * @param upgrade The upgrade that you're getting the model for.
-     * @param turtle  Access to the turtle that the upgrade resides on. This will be null when getting item models.
+     * @param turtle  Access to the turtle that the upgrade resides on. This will be null when getting item models, unless
+     *                {@link #getModel(ITurtleUpgrade, CompoundTag, TurtleSide)} is overriden.
      * @param side    Which side of the turtle (left or right) the upgrade resides on.
-     * @param data    Upgrade data instance for current turtle side.
      * @return The model that you wish to be used to render your upgrade.
      */
-    TransformedModel getModel(T upgrade, @Nullable ITurtleAccess turtle, TurtleSide side, DataComponentPatch data);
+    TransformedModel getModel(T upgrade, @Nullable ITurtleAccess turtle, TurtleSide side);
 
     /**
-     * Get the models that this turtle modeller depends on.
+     * Obtain the model to be used when rendering a turtle peripheral.
      * <p>
-     * Models included in this stream will be loaded and baked alongside item and block models, and so may be referenced
+     * This is used when rendering the turtle's item model, and so no {@link ITurtleAccess} is available.
+     *
+     * @param upgrade The upgrade that you're getting the model for.
+     * @param data    Upgrade data instance for current turtle side.
+     * @param side    Which side of the turtle (left or right) the upgrade resides on.
+     * @return The model that you wish to be used to render your upgrade.
+     */
+    default TransformedModel getModel(T upgrade, CompoundTag data, TurtleSide side) {
+        return getModel(upgrade, (ITurtleAccess) null, side);
+    }
+
+
+    /**
+     * Get a list of models that this turtle modeller depends on.
+     * <p>
+     * Models included in this list will be loaded and baked alongside item and block models, and so may be referenced
      * by {@link TransformedModel#of(ResourceLocation)}. You do not need to override this method if you will load models
      * by other means.
      *
      * @return A list of models that this modeller depends on.
      * @see UnbakedModel#getDependencies()
      */
-    default Stream<ResourceLocation> getDependencies() {
-        return Stream.of();
+    default Collection<ResourceLocation> getDependencies() {
+        return List.of();
     }
 
     /**
-     * A basic {@link TurtleUpgradeModeller} which renders using the upgrade's {@linkplain ITurtleUpgrade#getUpgradeItem(DataComponentPatch)}
+     * A basic {@link TurtleUpgradeModeller} which renders using the upgrade's {@linkplain ITurtleUpgrade#getUpgradeItem(CompoundTag)}
      * upgrade item}.
      * <p>
      * This uses appropriate transformations for "flat" items, namely those extending the {@literal minecraft:item/generated}
@@ -77,8 +100,9 @@ public interface TurtleUpgradeModeller<T extends ITurtleUpgrade> {
      * @param <T>   The type of the turtle upgrade.
      * @return The constructed modeller.
      */
-    static <T extends ITurtleUpgrade> TurtleUpgradeModeller<T> sided(ResourceLocation left, ResourceLocation right) {
-        return sided(ModelLocation.ofResource(left), ModelLocation.ofResource(right));
+    static <T extends ITurtleUpgrade> TurtleUpgradeModeller<T> sided(ModelResourceLocation left, ModelResourceLocation right) {
+        // TODO(1.21.0): Remove this.
+        return sided((ResourceLocation) left, right);
     }
 
     /**
@@ -89,16 +113,16 @@ public interface TurtleUpgradeModeller<T extends ITurtleUpgrade> {
      * @param <T>   The type of the turtle upgrade.
      * @return The constructed modeller.
      */
-    static <T extends ITurtleUpgrade> TurtleUpgradeModeller<T> sided(ModelLocation left, ModelLocation right) {
+    static <T extends ITurtleUpgrade> TurtleUpgradeModeller<T> sided(ResourceLocation left, ResourceLocation right) {
         return new TurtleUpgradeModeller<>() {
             @Override
-            public TransformedModel getModel(T upgrade, @Nullable ITurtleAccess turtle, TurtleSide side, DataComponentPatch data) {
+            public TransformedModel getModel(T upgrade, @Nullable ITurtleAccess turtle, TurtleSide side) {
                 return TransformedModel.of(side == TurtleSide.LEFT ? left : right);
             }
 
             @Override
-            public Stream<ResourceLocation> getDependencies() {
-                return Stream.of(left, right).flatMap(ModelLocation::getDependencies);
+            public Collection<ResourceLocation> getDependencies() {
+                return List.of(left, right);
             }
         };
     }

projects/common-api/src/client/java/dan200/computercraft/api/client/turtle/TurtleUpgradeModellers.java

@@ -11,10 +11,10 @@ import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
 import dan200.computercraft.impl.client.ClientPlatformHelper;
 import net.minecraft.client.Minecraft;
-import net.minecraft.core.component.DataComponentPatch;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.ItemStack;
 import org.joml.Matrix4f;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 final class TurtleUpgradeModellers {
     private static final Transformation leftTransform = getMatrixFor(-0.4065f);
@@ -36,8 +36,16 @@ final class TurtleUpgradeModellers {
 
     private static final class UpgradeItemModeller implements TurtleUpgradeModeller<ITurtleUpgrade> {
         @Override
-        public TransformedModel getModel(ITurtleUpgrade upgrade, @Nullable ITurtleAccess turtle, TurtleSide side, DataComponentPatch data) {
-            var stack = upgrade.getUpgradeItem(data);
+        public TransformedModel getModel(ITurtleUpgrade upgrade, @Nullable ITurtleAccess turtle, TurtleSide side) {
+            return getModel(turtle == null ? upgrade.getCraftingItem() : upgrade.getUpgradeItem(turtle.getUpgradeNBTData(side)), side);
+        }
+
+        @Override
+        public TransformedModel getModel(ITurtleUpgrade upgrade, CompoundTag data, TurtleSide side) {
+            return getModel(upgrade.getUpgradeItem(data), side);
+        }
+
+        private TransformedModel getModel(ItemStack stack, TurtleSide side) {
             var model = Minecraft.getInstance().getItemRenderer().getItemModelShaper().getItemModel(stack);
             if (stack.hasFoil()) model = ClientPlatformHelper.get().createdFoiledModel(model);
             return new TransformedModel(model, side == TurtleSide.LEFT ? leftTransform : rightTransform);

projects/common-api/src/client/java/dan200/computercraft/impl/client/ClientPlatformHelper.java

@@ -4,7 +4,6 @@
 
 package dan200.computercraft.impl.client;
 
-import dan200.computercraft.api.client.ModelLocation;
 import dan200.computercraft.impl.Services;
 import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.resources.model.BakedModel;
@@ -12,34 +11,18 @@ import net.minecraft.client.resources.model.ModelManager;
 import net.minecraft.client.resources.model.ModelResourceLocation;
 import net.minecraft.resources.ResourceLocation;
 import org.jetbrains.annotations.ApiStatus;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 @ApiStatus.Internal
 public interface ClientPlatformHelper {
     /**
-     * Get a model from a resource.
+     * Equivalent to {@link ModelManager#getModel(ModelResourceLocation)} but for arbitrary {@link ResourceLocation}s.
      *
-     * @param manager          The model manager.
-     * @param resourceLocation The model resourceLocation.
+     * @param manager  The model manager.
+     * @param location The model location.
      * @return The baked model.
-     * @see ModelLocation
      */
-    BakedModel getModel(ModelManager manager, ResourceLocation resourceLocation);
-
-    /**
-     * Set a model from a {@link ModelResourceLocation} or {@link ResourceLocation}.
-     * <p>
-     * This is largely equivalent to {@code resourceLocation == null ? manager.getModel(modelLocation) : getModel(manager, resourceLocation)},
-     * but allows pre-computing {@code modelLocation} (if needed).
-     *
-     * @param manager          The model manager.
-     * @param modelLocation    The location of the model to load.
-     * @param resourceLocation The location of the resource, if trying to load from a resource.
-     * @return The baked model.
-     * @see ModelLocation
-     */
-    BakedModel getModel(ModelManager manager, ModelResourceLocation modelLocation, @Nullable ResourceLocation resourceLocation);
+    BakedModel getModel(ModelManager manager, ResourceLocation location);
 
     /**
      * Wrap this model in a version which renders a foil/enchantment glint.

projects/common-api/src/client/java/dan200/computercraft/impl/client/ComputerCraftAPIClientService.java

@@ -4,34 +4,34 @@
 
 package dan200.computercraft.impl.client;
 
+import dan200.computercraft.api.client.ComputerCraftAPIClient;
 import dan200.computercraft.api.client.turtle.TurtleUpgradeModeller;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
-import dan200.computercraft.api.upgrades.UpgradeType;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
 import dan200.computercraft.impl.Services;
 import org.jetbrains.annotations.ApiStatus;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
- * Backing interface for CC's client-side API.
+ * Backing interface for {@link ComputerCraftAPIClient}
  * <p>
  * Do <strong>NOT</strong> directly reference this class. It exists for internal use by the API.
  */
 @ApiStatus.Internal
-public interface FabricComputerCraftAPIClientService {
-    static FabricComputerCraftAPIClientService get() {
+public interface ComputerCraftAPIClientService {
+    static ComputerCraftAPIClientService get() {
         var instance = Instance.INSTANCE;
-        return instance == null ? Services.raise(FabricComputerCraftAPIClientService.class, Instance.ERROR) : instance;
+        return instance == null ? Services.raise(ComputerCraftAPIClientService.class, Instance.ERROR) : instance;
     }
 
-    <T extends ITurtleUpgrade> void registerTurtleUpgradeModeller(UpgradeType<T> type, TurtleUpgradeModeller<T> modeller);
+    <T extends ITurtleUpgrade> void registerTurtleUpgradeModeller(TurtleUpgradeSerialiser<T> serialiser, TurtleUpgradeModeller<T> modeller);
 
     final class Instance {
-        static final @Nullable FabricComputerCraftAPIClientService INSTANCE;
+        static final @Nullable ComputerCraftAPIClientService INSTANCE;
         static final @Nullable Throwable ERROR;
 
         static {
-            var helper = Services.tryLoad(FabricComputerCraftAPIClientService.class);
+            var helper = Services.tryLoad(ComputerCraftAPIClientService.class);
             INSTANCE = helper.instance();
             ERROR = helper.error();
         }

projects/common-api/src/main/java/dan200/computercraft/api/ComputerCraftAPI.java

@@ -4,9 +4,11 @@
 
 package dan200.computercraft.api;
 
+import dan200.computercraft.api.component.ComputerComponent;
 import dan200.computercraft.api.filesystem.Mount;
 import dan200.computercraft.api.filesystem.WritableMount;
 import dan200.computercraft.api.lua.GenericSource;
+import dan200.computercraft.api.lua.IComputerSystem;
 import dan200.computercraft.api.lua.ILuaAPI;
 import dan200.computercraft.api.lua.ILuaAPIFactory;
 import dan200.computercraft.api.media.IMedia;
@@ -24,8 +26,7 @@ import net.minecraft.core.Direction;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.Level;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * The static entry point to the ComputerCraft API.
@@ -165,7 +166,13 @@ public final class ComputerCraftAPI {
      * Register a custom {@link ILuaAPI}, which may be added onto all computers without requiring a peripheral.
      * <p>
      * Before implementing this interface, consider alternative methods of providing methods. It is generally preferred
-     * to use peripherals to provide functionality to users.
+     * to use peripherals to provide functionality to users. If an API is <em>required</em>, you may want to consider
+     * using {@link ILuaAPI#getModuleName()} to expose this library as a module instead of as a global.
+     * <p>
+     * This may be used with {@link IComputerSystem#getComponent(ComputerComponent)} to only attach APIs to specific
+     * computers. For example, one can add a new API just to turtles with the following code:
+     *
+     * {@snippet class=com.example.examplemod.ExampleAPI region=register}
      *
      * @param factory The factory for your API subclass.
      * @see ILuaAPIFactory

projects/common-api/src/main/java/dan200/computercraft/api/ComputerCraftTags.java

@@ -6,12 +6,10 @@ package dan200.computercraft.api;
 
 import net.minecraft.core.registries.Registries;
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.tags.ItemTags;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.Item;
-import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.context.UseOnContext;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Block;
@@ -37,16 +35,8 @@ public class ComputerCraftTags {
          */
         public static final TagKey<Item> TURTLE_CAN_PLACE = make("turtle_can_place");
 
-        /**
-         * Items which can be dyed.
-         * <p>
-         * This is similar to {@link ItemTags#DYEABLE}, but allows cleaning the item with a sponge, rather than in a
-         * cauldron.
-         */
-        public static final TagKey<Item> DYEABLE = make("dyeable");
-
         private static TagKey<Item> make(String name) {
-            return TagKey.create(Registries.ITEM, ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, name));
+            return TagKey.create(Registries.ITEM, new ResourceLocation(ComputerCraftAPI.MOD_ID, name));
         }
     }
 
@@ -85,13 +75,13 @@ public class ComputerCraftTags {
         public static final TagKey<Block> TURTLE_HOE_BREAKABLE = make("turtle_hoe_harvestable");
 
         /**
-         * Block which can be {@linkplain BlockState#useItemOn(ItemStack, Level, Player, InteractionHand, BlockHitResult) used}
-         * when calling {@code turtle.place()}.
+         * Block which can be {@linkplain BlockState#use(Level, Player, InteractionHand, BlockHitResult) used} when
+         * calling {@code turtle.place()}.
          */
         public static final TagKey<Block> TURTLE_CAN_USE = make("turtle_can_use");
 
         private static TagKey<Block> make(String name) {
-            return TagKey.create(Registries.BLOCK, ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, name));
+            return TagKey.create(Registries.BLOCK, new ResourceLocation(ComputerCraftAPI.MOD_ID, name));
         }
     }
 }

projects/common-api/src/main/java/dan200/computercraft/api/component/AdminComputer.java

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2024 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.component;
+
+import net.minecraft.commands.CommandSourceStack;
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * A computer which has permission to perform administrative/op commands, such as the command computer.
+ */
+@ApiStatus.NonExtendable
+public interface AdminComputer {
+    /**
+     * The permission level that this computer can operate at.
+     *
+     * @return The permission level for this computer.
+     * @see CommandSourceStack#hasPermission(int)
+     */
+    default int permissionLevel() {
+        return 2;
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/component/ComputerComponent.java

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2024 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.component;
+
+import dan200.computercraft.api.lua.IComputerSystem;
+import dan200.computercraft.api.lua.ILuaAPIFactory;
+
+/**
+ * A component attached to a computer.
+ * <p>
+ * Components provide a mechanism to attach additional data to a computer, that can then be queried with
+ * {@link IComputerSystem#getComponent(ComputerComponent)}.
+ * <p>
+ * This is largely designed for {@linkplain ILuaAPIFactory custom APIs}, allowing APIs to read additional properties
+ * of the computer, such as its position.
+ *
+ * @param <T> The type of this component.
+ * @see ComputerComponents The built-in components.
+ */
+@SuppressWarnings("UnusedTypeParameter")
+public final class ComputerComponent<T> {
+    private final String id;
+
+    private ComputerComponent(String id) {
+        this.id = id;
+    }
+
+    /**
+     * Create a new computer component.
+     * <p>
+     * Mods typically will not need to create their own components.
+     *
+     * @param namespace The namespace of this component. This should be the mod id.
+     * @param id        The unique id of this component.
+     * @param <T>       The component
+     * @return The newly created component.
+     */
+    public static <T> ComputerComponent<T> create(String namespace, String id) {
+        return new ComputerComponent<>(namespace + ":" + id);
+    }
+
+    @Override
+    public String toString() {
+        return "ComputerComponent(" + id + ")";
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/component/ComputerComponents.java

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: 2024 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.component;
+
+import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.api.pocket.IPocketAccess;
+import dan200.computercraft.api.turtle.ITurtleAccess;
+
+/**
+ * The {@link ComputerComponent}s provided by ComputerCraft.
+ */
+public class ComputerComponents {
+    /**
+     * The {@link ITurtleAccess} associated with a turtle.
+     */
+    public static final ComputerComponent<ITurtleAccess> TURTLE = ComputerComponent.create(ComputerCraftAPI.MOD_ID, "turtle");
+
+    /**
+     * The {@link IPocketAccess} associated with a pocket computer.
+     */
+    public static final ComputerComponent<IPocketAccess> POCKET = ComputerComponent.create(ComputerCraftAPI.MOD_ID, "pocket");
+
+    /**
+     * This component is only present on "command computers", and other computers with admin capabilities.
+     */
+    public static final ComputerComponent<AdminComputer> ADMIN_COMPUTER = ComputerComponent.create(ComputerCraftAPI.MOD_ID, "admin_computer");
+}

projects/common-api/src/main/java/dan200/computercraft/api/detail/BasicItemDetailProvider.java

@@ -6,14 +6,14 @@ package dan200.computercraft.api.detail;
 
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
 
 /**
- * An item detail provider for {@link ItemStack}'s whose {@link Item} has a specific type.
+ * An item detail provider for {@link ItemStack}s whose {@link Item} has a specific type.
  *
  * @param <T> The type the stack's item must have.
  */
@@ -22,7 +22,7 @@ public abstract class BasicItemDetailProvider<T> implements DetailProvider<ItemS
     private final @Nullable String namespace;
 
     /**
-     * Create a new item detail provider. Meta will be inserted into a new sub-map named as per {@code namespace}.
+     * Create a new item detail provider. Details will be inserted into a new sub-map named as per {@code namespace}.
      *
      * @param itemType  The type the stack's item must have.
      * @param namespace The namespace to use for this provider.
@@ -34,7 +34,7 @@ public abstract class BasicItemDetailProvider<T> implements DetailProvider<ItemS
     }
 
     /**
-     * Create a new item detail provider. Meta will be inserted directly into the results.
+     * Create a new item detail provider. Details will be inserted directly into the results.
      *
      * @param itemType The type the stack's item must have.
      */
@@ -53,21 +53,18 @@ public abstract class BasicItemDetailProvider<T> implements DetailProvider<ItemS
      * @param stack The item stack to provide details for.
      * @param item  The item to provide details for.
      */
-    public abstract void provideDetails(
-        Map<? super String, Object> data, ItemStack stack, T item
-    );
+    public abstract void provideDetails(Map<? super String, Object> data, ItemStack stack, T item);
 
     @Override
-    public void provideDetails(Map<? super String, Object> data, ItemStack stack) {
+    public final void provideDetails(Map<? super String, Object> data, ItemStack stack) {
         var item = stack.getItem();
         if (!itemType.isInstance(item)) return;
 
-        // If `namespace` is specified, insert into a new data map instead of the existing one.
-        Map<? super String, Object> child = namespace == null ? data : new HashMap<>();
-
-        provideDetails(child, stack, itemType.cast(item));
-
-        if (namespace != null) {
+        if (namespace == null) {
+            provideDetails(data, stack, itemType.cast(item));
+        } else {
+            Map<? super String, Object> child = new HashMap<>();
+            provideDetails(child, stack, itemType.cast(item));
             data.put(namespace, child);
         }
     }

projects/common-api/src/main/java/dan200/computercraft/api/detail/BlockReference.java

@@ -8,8 +8,7 @@ import net.minecraft.core.BlockPos;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.entity.BlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * A reference to a block in the world, used by block detail providers.

projects/common-api/src/main/java/dan200/computercraft/api/detail/DetailProvider.java

@@ -14,6 +14,7 @@ import java.util.Map;
  *
  * @param <T> The type of object that this provider can provide details for.
  * @see DetailRegistry
+ * @see dan200.computercraft.api.detail An overview of the detail system.
  */
 @FunctionalInterface
 public interface DetailProvider<T> {

projects/common-api/src/main/java/dan200/computercraft/api/detail/DetailRegistry.java

@@ -17,6 +17,7 @@ import java.util.Map;
  * also in this package.
  *
  * @param <T> The type of object that this registry provides details for.
+ * @see dan200.computercraft.api.detail An overview of the detail system.
  */
 @ApiStatus.NonExtendable
 public interface DetailRegistry<T> {
@@ -26,7 +27,7 @@ public interface DetailRegistry<T> {
      * @param provider The detail provider to register.
      * @see DetailProvider
      */
-    void addProvider(DetailProvider<T> provider);
+    void addProvider(DetailProvider<? super T> provider);
 
     /**
      * Compute basic details about an object. This is cheaper than computing all details operation, and so is suitable

projects/common-api/src/main/java/dan200/computercraft/api/detail/VanillaDetailRegistries.java

@@ -17,6 +17,9 @@ public class VanillaDetailRegistries {
      * <p>
      * This instance's {@link DetailRegistry#getBasicDetails(Object)} is thread safe (assuming the stack is immutable)
      * and may be called from the computer thread.
+     * <p>
+     * This does not have special handling for {@linkplain ItemStack#isEmpty() empty item stacks}, and so the returned
+     * details will be an empty stack of air. Callers should generally check for empty stacks before calling this.
      */
     public static final DetailRegistry<ItemStack> ITEM_STACK = ComputerCraftAPIService.get().getItemStackDetailRegistry();
 

projects/common-api/src/main/java/dan200/computercraft/api/detail/package-info.java

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+/**
+ * The detail system provides a standard way for mods to return descriptions of common game objects, such as blocks or
+ * items, as well as registering additional detail to be included in those descriptions.
+ * <p>
+ * For instance, the built-in {@code turtle.getItemDetail()} method uses
+ * {@linkplain dan200.computercraft.api.detail.VanillaDetailRegistries#ITEM_STACK in order to provide information about}
+ * the selected item:
+ *
+ * <pre class="language language-lua">{@code
+ * local item = turtle.getItemDetail(nil, true)
+ * --[[
+ * item = {
+ *   name = "minecraft:wheat",
+ *   displayName = "Wheat",
+ *   count = 1,
+ *   maxCount = 64,
+ *   tags = {},
+ * }
+ * ]]
+ * }</pre>
+ *
+ * <h2>Built-in detail providers</h2>
+ * While you can define your own detail providers (perhaps for types from your own mod), CC comes with several built-in
+ * detail registries for vanilla and mod-loader objects:
+ *
+ * <ul>
+ *     <li>{@link dan200.computercraft.api.detail.VanillaDetailRegistries}, for vanilla objects</li>
+ *     <li>{@code dan200.computercraft.api.detail.ForgeDetailRegistries} for Forge-specific objects</li>
+ *     <li>{@code dan200.computercraft.api.detail.FabricDetailRegistries} for Fabric-specific objects</li>
+ * </ul>
+ *
+ * <h2>Example: Returning details from methods</h2>
+ * Here we define a {@code getHeldItem()} method for pocket computers which finds the currently held item of the player
+ * and returns it to the user using {@link dan200.computercraft.api.detail.VanillaDetailRegistries#ITEM_STACK} and
+ * {@link dan200.computercraft.api.detail.DetailRegistry#getDetails(java.lang.Object)}.
+ *
+ * {@snippet class=com.example.examplemod.ExamplePocketPeripheral region=details}
+ *
+ * <h2>Example: Registering custom detail registries</h2>
+ * Here we define a new detail provider for items that includes the nutrition and saturation values in the returned object.
+ *
+ * {@snippet class=com.example.examplemod.ExampleMod region=details}
+ */
+package dan200.computercraft.api.detail;

projects/common-api/src/main/java/dan200/computercraft/api/lua/IComputerSystem.java

@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.lua;
+
+import dan200.computercraft.api.component.ComputerComponent;
+import dan200.computercraft.api.peripheral.IComputerAccess;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * An interface passed to {@link ILuaAPIFactory} in order to provide additional information
+ * about a computer.
+ */
+@ApiStatus.NonExtendable
+public interface IComputerSystem extends IComputerAccess {
+    /**
+     * Get the level this computer is currently in.
+     * <p>
+     * This method is not guaranteed to remain the same (even for stationary computers).
+     *
+     * @return The computer's current level.
+     */
+    ServerLevel getLevel();
+
+    /**
+     * Get the position this computer is currently at.
+     * <p>
+     * This method is not guaranteed to remain the same (even for stationary computers).
+     *
+     * @return The computer's current position.
+     */
+    BlockPos getPosition();
+
+    /**
+     * Get the label for this computer.
+     *
+     * @return This computer's label, or {@code null} if it is not set.
+     */
+    @Nullable
+    String getLabel();
+
+    /**
+     * Get a component attached to this computer.
+     * <p>
+     * No component is guaranteed to be on a computer, and so this method should always be guarded with a null check.
+     * <p>
+     * This method will always return the same value for a given component, and so may be cached.
+     *
+     * @param component The component to query.
+     * @param <T>       The type of the component.
+     * @return The component, if present.
+     */
+    <T> @Nullable T getComponent(ComputerComponent<T> component);
+}

projects/common-api/src/main/java/dan200/computercraft/api/lua/ILuaAPIFactory.java

@@ -4,13 +4,14 @@
 
 package dan200.computercraft.api.lua;
 
-import javax.annotation.Nullable;
+import dan200.computercraft.api.ComputerCraftAPI;
+import org.jspecify.annotations.Nullable;
 
 /**
- * Construct an {@link ILuaAPI} for a specific computer.
+ * Construct an {@link ILuaAPI} for a computer.
  *
  * @see ILuaAPI
- * @see dan200.computercraft.api.ComputerCraftAPI#registerAPIFactory(ILuaAPIFactory)
+ * @see ComputerCraftAPI#registerAPIFactory(ILuaAPIFactory)
  */
 @FunctionalInterface
 public interface ILuaAPIFactory {

projects/common-api/src/main/java/dan200/computercraft/api/media/IMedia.java

@@ -7,15 +7,12 @@ package dan200.computercraft.api.media;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.filesystem.Mount;
 import dan200.computercraft.api.filesystem.WritableMount;
-import net.minecraft.core.Holder;
-import net.minecraft.core.HolderLookup;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerLevel;
+import net.minecraft.sounds.SoundEvent;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.JukeboxSong;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Represents an item that can be placed in a disk drive and used by a Computer.
@@ -27,12 +24,11 @@ public interface IMedia {
     /**
      * Get a string representing the label of this item. Will be called via {@code disk.getLabel()} in lua.
      *
-     * @param registries The currently loaded registries.
-     * @param stack      The {@link ItemStack} to inspect.
+     * @param stack The {@link ItemStack} to inspect.
      * @return The label. ie: "Dan's Programs".
      */
     @Nullable
-    String getLabel(HolderLookup.Provider registries, ItemStack stack);
+    String getLabel(ItemStack stack);
 
     /**
      * Set a string representing the label of this item. Will be called vi {@code disk.setLabel()} in lua.
@@ -46,15 +42,26 @@ public interface IMedia {
     }
 
     /**
-     * If this disk represents an item with audio (like a record), get the corresponding {@link JukeboxSong}.
+     * If this disk represents an item with audio (like a record), get the readable name of the audio track. ie:
+     * "Jonathan Coulton - Still Alive"
      *
-     * @param registries The currently loaded registries.
-     * @param stack      The {@link ItemStack} to query.
-     * @return The song, or null if this item does not represent an item with audio.
+     * @param stack The {@link ItemStack} to modify.
+     * @return The name, or null if this item does not represent an item with audio.
      */
     @Nullable
-    default Holder<JukeboxSong> getAudio(HolderLookup.Provider registries, ItemStack stack) {
-        return JukeboxSong.fromStack(registries, stack).orElse(null);
+    default String getAudioTitle(ItemStack stack) {
+        return null;
+    }
+
+    /**
+     * If this disk represents an item with audio (like a record), get the resource name of the audio track to play.
+     *
+     * @param stack The {@link ItemStack} to modify.
+     * @return The name, or null if this item does not represent an item with audio.
+     */
+    @Nullable
+    default SoundEvent getAudio(ItemStack stack) {
+        return null;
     }
 
     /**

projects/common-api/src/main/java/dan200/computercraft/api/media/MediaProvider.java

@@ -5,8 +5,7 @@
 package dan200.computercraft.api.media;
 
 import net.minecraft.world.item.ItemStack;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * This interface is used to provide {@link IMedia} implementations for {@link ItemStack}.

projects/common-api/src/main/java/dan200/computercraft/api/media/PrintoutContents.java

@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2025 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.media;
+
+import dan200.computercraft.impl.ComputerCraftAPIService;
+import net.minecraft.world.item.ItemStack;
+import org.jspecify.annotations.Nullable;
+
+import java.util.stream.Stream;
+
+/**
+ * The contents of a page (or book) created by a ComputerCraft printer.
+ *
+ * @since 1.115
+ */
+@Nullable
+public interface PrintoutContents {
+    /**
+     * Get the (possibly empty) title for this printout.
+     *
+     * @return The title of this printout.
+     */
+    String getTitle();
+
+    /**
+     * Get the text contents of this printout, as a sequence of lines.
+     * <p>
+     * The lines in the printout may include blank lines at the end of the document, as well as trailing spaces on each
+     * line.
+     *
+     * @return The text contents of this printout.
+     */
+    Stream<String> getTextLines();
+
+    /**
+     * Get the printout contents for a particular stack.
+     *
+     * @param stack The stack to get the contents for.
+     * @return The printout contents, or {@code null} if this is not a printout item.
+     */
+    static @Nullable PrintoutContents get(ItemStack stack) {
+        return ComputerCraftAPIService.get().getPrintoutContents(stack);
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/network/wired/WiredElement.java

@@ -14,13 +14,13 @@ import dan200.computercraft.api.ComputerCraftAPI;
  * as a proxy for all network objects. Whilst the node may change networks, an element's node should remain constant
  * for its lifespan.
  * <p>
- * Elements are generally tied to a block or tile entity in world. In such as case, one should provide the
+ * Elements are generally tied to a block or block entity in world. In such as case, one should provide the
  * {@link WiredElement} capability for the appropriate sides.
  */
 public interface WiredElement extends WiredSender {
     /**
-     * Called when objects on the network change. This may occur when network nodes are added or removed, or when
-     * peripherals change.
+     * Called when peripherals on the network change. This may occur when network nodes are added or removed, or when
+     * peripherals are attached or detached from a modem.
      *
      * @param change The change which occurred.
      * @see WiredNetworkChange

projects/common-api/src/main/java/dan200/computercraft/api/network/wired/WiredNetwork.java

@@ -0,0 +1,92 @@
+// SPDX-FileCopyrightText: 2018 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.network.wired;
+
+import dan200.computercraft.api.peripheral.IPeripheral;
+import org.jetbrains.annotations.ApiStatus;
+
+import java.util.Map;
+
+/**
+ * A wired network is composed of one of more {@link WiredNode}s, a set of connections between them, and a series
+ * of peripherals.
+ * <p>
+ * Networks from a connected graph. This means there is some path between all nodes on the network. Further more, if
+ * there is some path between two nodes then they must be on the same network. {@link WiredNetwork} will automatically
+ * handle the merging and splitting of networks (and thus changing of available nodes and peripherals) as connections
+ * change.
+ * <p>
+ * This does mean one can not rely on the network remaining consistent between subsequent operations. Consequently,
+ * it is generally preferred to use the methods provided by {@link WiredNode}.
+ *
+ * @see WiredNode#getNetwork()
+ */
+@ApiStatus.NonExtendable
+public interface WiredNetwork {
+    /**
+     * Create a connection between two nodes.
+     * <p>
+     * This should only be used on the server thread.
+     *
+     * @param left  The first node to connect
+     * @param right The second node to connect
+     * @return {@code true} if a connection was created or {@code false} if the connection already exists.
+     * @throws IllegalStateException    If neither node is on the network.
+     * @throws IllegalArgumentException If {@code left} and {@code right} are equal.
+     * @see WiredNode#connectTo(WiredNode)
+     * @see WiredNetwork#connect(WiredNode, WiredNode)
+     * @deprecated Use {@link WiredNode#connectTo(WiredNode)}
+     */
+    @Deprecated
+    boolean connect(WiredNode left, WiredNode right);
+
+    /**
+     * Destroy a connection between this node and another.
+     * <p>
+     * This should only be used on the server thread.
+     *
+     * @param left  The first node in the connection.
+     * @param right The second node in the connection.
+     * @return {@code true} if a connection was destroyed or {@code false} if no connection exists.
+     * @throws IllegalArgumentException If either node is not on the network.
+     * @throws IllegalArgumentException If {@code left} and {@code right} are equal.
+     * @see WiredNode#disconnectFrom(WiredNode)
+     * @see WiredNetwork#connect(WiredNode, WiredNode)
+     * @deprecated Use {@link WiredNode#disconnectFrom(WiredNode)}
+     */
+    @Deprecated
+    boolean disconnect(WiredNode left, WiredNode right);
+
+    /**
+     * Sever all connections this node has, removing it from this network.
+     * <p>
+     * This should only be used on the server thread. You should only call this on nodes
+     * that your network element owns.
+     *
+     * @param node The node to remove
+     * @return Whether this node was removed from the network. One cannot remove a node from a network where it is the
+     * only element.
+     * @throws IllegalArgumentException If the node is not in the network.
+     * @see WiredNode#remove()
+     * @deprecated Use {@link WiredNode#remove()}
+     */
+    @Deprecated
+    boolean remove(WiredNode node);
+
+    /**
+     * Update the peripherals a node provides.
+     * <p>
+     * This should only be used on the server thread. You should only call this on nodes
+     * that your network element owns.
+     *
+     * @param node        The node to attach peripherals for.
+     * @param peripherals The new peripherals for this node.
+     * @throws IllegalArgumentException If the node is not in the network.
+     * @see WiredNode#updatePeripherals(Map)
+     * @deprecated Use {@link WiredNode#updatePeripherals(Map)}
+     */
+    @Deprecated
+    void updatePeripherals(WiredNode node, Map<String, IPeripheral> peripherals);
+}

projects/common-api/src/main/java/dan200/computercraft/api/network/wired/WiredNode.java

@@ -11,7 +11,7 @@ import org.jetbrains.annotations.ApiStatus;
 import java.util.Map;
 
 /**
- * A single node on a wired network.
+ * Wired nodes act as a layer between {@link WiredElement}s and {@link WiredNetwork}s.
  * <p>
  * Firstly, a node acts as a packet network, capable of sending and receiving modem messages to connected nodes. These
  * methods may be safely used on any thread.
@@ -32,6 +32,18 @@ public interface WiredNode extends PacketNetwork {
      */
     WiredElement getElement();
 
+    /**
+     * The network this node is currently connected to. Note that this may change
+     * after any network operation, so it should not be cached.
+     * <p>
+     * This should only be used on the server thread.
+     *
+     * @return This node's network.
+     * @deprecated Use the connect/disconnect/remove methods on {@link WiredNode}.
+     */
+    @Deprecated
+    WiredNetwork getNetwork();
+
     /**
      * Create a connection from this node to another.
      * <p>

projects/common-api/src/main/java/dan200/computercraft/api/network/wired/WiredSender.java

@@ -8,12 +8,10 @@ import dan200.computercraft.api.network.PacketSender;
 
 
 /**
- * An object on a wired network capable of sending packets.
+ * An object on a {@link WiredNetwork} capable of sending packets.
  * <p>
  * Unlike a regular {@link PacketSender}, this must be associated with the node you are attempting to
  * to send the packet from.
- *
- * @see WiredElement
  */
 public interface WiredSender extends PacketSender {
     /**

projects/common-api/src/main/java/dan200/computercraft/api/pocket/AbstractPocketUpgrade.java

@@ -4,7 +4,8 @@
 
 package dan200.computercraft.api.pocket;
 
-import net.minecraft.network.chat.Component;
+import dan200.computercraft.api.upgrades.UpgradeBase;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 
 
@@ -14,20 +15,27 @@ import net.minecraft.world.item.ItemStack;
  * One does not have to use this, but it does provide a convenient template.
  */
 public abstract class AbstractPocketUpgrade implements IPocketUpgrade {
-    private final Component adjective;
+    private final ResourceLocation id;
+    private final String adjective;
     private final ItemStack stack;
 
-    protected AbstractPocketUpgrade(Component adjective, ItemStack stack) {
+    protected AbstractPocketUpgrade(ResourceLocation id, String adjective, ItemStack stack) {
+        this.id = id;
         this.adjective = adjective;
         this.stack = stack;
     }
 
-    protected AbstractPocketUpgrade(String adjective, ItemStack stack) {
-        this(Component.translatable(adjective), stack);
+    protected AbstractPocketUpgrade(ResourceLocation id, ItemStack stack) {
+        this(id, UpgradeBase.getDefaultAdjective(id), stack);
     }
 
     @Override
-    public final Component getAdjective() {
+    public final ResourceLocation getUpgradeID() {
+        return id;
+    }
+
+    @Override
+    public final String getUnlocalisedAdjective() {
         return adjective;
     }
 

projects/common-api/src/main/java/dan200/computercraft/api/pocket/IPocketAccess.java

@@ -4,17 +4,39 @@
 
 package dan200.computercraft.api.pocket;
 
+import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.upgrades.UpgradeBase;
-import net.minecraft.core.component.DataComponentPatch;
+import dan200.computercraft.api.upgrades.UpgradeData;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.phys.Vec3;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
+import java.util.Map;
 
 /**
  * Wrapper class for pocket computers.
  */
+@ApiStatus.NonExtendable
 public interface IPocketAccess {
+    /**
+     * Get the level in which the pocket computer exists.
+     *
+     * @return The pocket computer's level.
+     */
+    ServerLevel getLevel();
+
+    /**
+     * Get the position of the pocket computer.
+     *
+     * @return The pocket computer's position.
+     */
+    Vec3 getPosition();
+
     /**
      * Gets the entity holding this item.
      * <p>
@@ -61,25 +83,45 @@ public interface IPocketAccess {
      */
     void setLight(int colour);
 
+    /**
+     * Get the currently equipped upgrade.
+     *
+     * @return The currently equipped upgrade.
+     * @see #getUpgradeNBTData()
+     * @see #setUpgrade(UpgradeData)
+     */
+    @Nullable
+    UpgradeData<IPocketUpgrade> getUpgrade();
+
+    /**
+     * Set the upgrade for this pocket computer, also updating the item stack.
+     * <p>
+     * Note this method is not thread safe - it must be called from the server thread.
+     *
+     * @param upgrade The new upgrade to set it to, may be {@code null}.
+     * @see #getUpgrade()
+     */
+    void setUpgrade(@Nullable UpgradeData<IPocketUpgrade> upgrade);
+
     /**
      * Get the upgrade-specific NBT.
      * <p>
      * This is persisted between computer reboots and chunk loads.
      *
      * @return The upgrade's NBT.
-     * @see #setUpgradeData(DataComponentPatch)
-     * @see UpgradeBase#getUpgradeItem(DataComponentPatch)
+     * @see #updateUpgradeNBTData()
+     * @see UpgradeBase#getUpgradeItem(CompoundTag)
      * @see UpgradeBase#getUpgradeData(ItemStack)
+     * @see #getUpgrade()
      */
-    DataComponentPatch getUpgradeData();
+    CompoundTag getUpgradeNBTData();
 
     /**
-     * Update the upgrade-specific data.
+     * Mark the upgrade-specific NBT as dirty.
      *
-     * @param data The new upgrade data.
-     * @see #getUpgradeData()
+     * @see #getUpgradeNBTData()
      */
-    void setUpgradeData(DataComponentPatch data);
+    void updateUpgradeNBTData();
 
     /**
      * Remove the current peripheral and create a new one.
@@ -88,4 +130,13 @@ public interface IPocketAccess {
      * entity} changes.
      */
     void invalidatePeripheral();
+
+    /**
+     * Get a list of all upgrades for the pocket computer.
+     *
+     * @return A collection of all upgrade names.
+     * @deprecated This is a relic of a previous API, which no longer makes sense with newer versions of ComputerCraft.
+     */
+    @Deprecated(forRemoval = true)
+    Map<ResourceLocation, IPeripheral> getUpgrades();
 }

projects/common-api/src/main/java/dan200/computercraft/api/pocket/IPocketUpgrade.java

@@ -4,69 +4,21 @@
 
 package dan200.computercraft.api.pocket;
 
-import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.upgrades.UpgradeBase;
-import dan200.computercraft.api.upgrades.UpgradeType;
-import dan200.computercraft.impl.ComputerCraftAPIService;
-import net.minecraft.core.Registry;
-import net.minecraft.resources.ResourceKey;
-import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.level.Level;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * A peripheral which can be equipped to the back side of a pocket computer.
  * <p>
- * Pocket upgrades are defined in two stages. First, one creates a {@link IPocketUpgrade} subclass and corresponding
- * {@link UpgradeType} instance, which are then registered in a registry.
+ * Pocket upgrades are defined in two stages. First, on creates a {@link IPocketUpgrade} subclass and corresponding
+ * {@link PocketUpgradeSerialiser} instance, which are then registered in a Minecraft registry.
  * <p>
  * You then write a JSON file in your mod's {@literal data/} folder. This is then parsed when the world is loaded, and
- * the upgrade automatically registered. It is recommended this is done via
- * <a href="../upgrades/UpgradeType.html#datagen">data generators</a>.
- *
- * <h2>Example</h2>
- * {@snippet lang="java" :
- * // We use Forge's DeferredRegister to register our upgrade type. Fabric mods may register their type directly.
- * static final DeferredRegister<UpgradeType<? extends IPocketUpgrade>> POCKET_UPGRADES = DeferredRegister.create(IPocketUpgrade.typeRegistry(), "my_mod");
- *
- * // Register a new upgrade upgrade type called "my_upgrade".
- * public static final RegistryObject<UpgradeType<MyUpgrade>> MY_UPGRADE =
- *     POCKET_UPGRADES.register("my_upgrade", () -> UpgradeType.simple(new MyUpgrade()));
- *
- * // Then in your constructor
- * POCKET_UPGRADES.register(bus);
- * }
- * <p>
- * We can then define a new upgrade using JSON by placing the following in
- * {@code data/<my_mod>/computercraft/pocket_upgrade/<my_upgrade_id>.json}.
- * {@snippet lang="json" :
- * {
- *     "type": "my_mod:my_upgrade"
- * }
- * }
+ * the upgrade registered internally.
  */
 public interface IPocketUpgrade extends UpgradeBase {
-    ResourceKey<Registry<IPocketUpgrade>> REGISTRY = ResourceKey.createRegistryKey(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "pocket_upgrade"));
-
-    /**
-     * The registry key for pocket upgrade types.
-     *
-     * @return The registry key.
-     */
-    static ResourceKey<Registry<UpgradeType<? extends IPocketUpgrade>>> typeRegistry() {
-        return ComputerCraftAPIService.get().pocketUpgradeRegistryId();
-    }
-
-    /**
-     * Get the type of this upgrade.
-     *
-     * @return The type of this upgrade.
-     */
-    @Override
-    UpgradeType<? extends IPocketUpgrade> getType();
-
     /**
      * Creates a peripheral for the pocket computer.
      * <p>

projects/common-api/src/main/java/dan200/computercraft/api/pocket/PocketUpgradeDataProvider.java

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.pocket;
+
+import dan200.computercraft.api.upgrades.UpgradeDataProvider;
+import net.minecraft.data.DataGenerator;
+import net.minecraft.data.PackOutput;
+
+import java.util.function.Consumer;
+
+/**
+ * A data provider to generate pocket computer upgrades.
+ * <p>
+ * This should be subclassed and registered to a {@link DataGenerator.PackGenerator}. Override the
+ * {@link #addUpgrades(Consumer)} function, construct each upgrade, and pass them off to the provided consumer to
+ * generate them.
+ *
+ * @see PocketUpgradeSerialiser
+ */
+public abstract class PocketUpgradeDataProvider extends UpgradeDataProvider<IPocketUpgrade, PocketUpgradeSerialiser<?>> {
+    public PocketUpgradeDataProvider(PackOutput output) {
+        super(output, "Pocket Computer Upgrades", "computercraft/pocket_upgrades", PocketUpgradeSerialiser.registryId());
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/pocket/PocketUpgradeSerialiser.java

@@ -0,0 +1,79 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.pocket;
+
+import dan200.computercraft.api.upgrades.UpgradeBase;
+import dan200.computercraft.api.upgrades.UpgradeSerialiser;
+import dan200.computercraft.impl.ComputerCraftAPIService;
+import dan200.computercraft.impl.upgrades.SerialiserWithCraftingItem;
+import dan200.computercraft.impl.upgrades.SimpleSerialiser;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.crafting.SimpleCraftingRecipeSerializer;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+/**
+ * Reads a {@link IPocketUpgrade} from disk and reads/writes it to a network packet.
+ * <p>
+ * This follows the same format as {@link dan200.computercraft.api.turtle.TurtleUpgradeSerialiser} - consult the
+ * documentation there for more information.
+ *
+ * @param <T> The type of pocket computer upgrade this is responsible for serialising.
+ * @see IPocketUpgrade
+ * @see PocketUpgradeDataProvider
+ */
+public interface PocketUpgradeSerialiser<T extends IPocketUpgrade> extends UpgradeSerialiser<T> {
+    /**
+     * The ID for the associated registry.
+     *
+     * @return The registry key.
+     */
+    static ResourceKey<Registry<PocketUpgradeSerialiser<?>>> registryId() {
+        return ComputerCraftAPIService.get().pocketUpgradeRegistryId();
+    }
+
+    /**
+     * Create an upgrade serialiser for a simple upgrade. This is similar to a {@link SimpleCraftingRecipeSerializer},
+     * but for upgrades.
+     * <p>
+     * If you might want to vary the item, it's suggested you use {@link #simpleWithCustomItem(BiFunction)} instead.
+     *
+     * @param factory Generate a new upgrade with a specific ID.
+     * @param <T>     The type of the generated upgrade.
+     * @return The serialiser for this upgrade
+     */
+    static <T extends IPocketUpgrade> PocketUpgradeSerialiser<T> simple(Function<ResourceLocation, T> factory) {
+        final class Impl extends SimpleSerialiser<T> implements PocketUpgradeSerialiser<T> {
+            private Impl(Function<ResourceLocation, T> constructor) {
+                super(constructor);
+            }
+        }
+
+        return new Impl(factory);
+    }
+
+    /**
+     * Create an upgrade serialiser for a simple upgrade whose crafting item can be specified.
+     *
+     * @param factory Generate a new upgrade with a specific ID and crafting item. The returned upgrade's
+     *                {@link UpgradeBase#getCraftingItem()} <strong>MUST</strong> equal the provided item.
+     * @param <T>     The type of the generated upgrade.
+     * @return The serialiser for this upgrade.
+     * @see #simple(Function)  For upgrades whose crafting stack should not vary.
+     */
+    static <T extends IPocketUpgrade> PocketUpgradeSerialiser<T> simpleWithCustomItem(BiFunction<ResourceLocation, ItemStack, T> factory) {
+        final class Impl extends SerialiserWithCraftingItem<T> implements PocketUpgradeSerialiser<T> {
+            private Impl(BiFunction<ResourceLocation, ItemStack, T> factory) {
+                super(factory);
+            }
+        }
+
+        return new Impl(factory);
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/turtle/AbstractTurtleUpgrade.java

@@ -4,7 +4,8 @@
 
 package dan200.computercraft.api.turtle;
 
-import net.minecraft.network.chat.Component;
+import dan200.computercraft.api.upgrades.UpgradeBase;
+import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 
 
@@ -14,27 +15,34 @@ import net.minecraft.world.item.ItemStack;
  * One does not have to use this, but it does provide a convenient template.
  */
 public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade {
+    private final ResourceLocation id;
     private final TurtleUpgradeType type;
-    private final Component adjective;
+    private final String adjective;
     private final ItemStack stack;
 
-    protected AbstractTurtleUpgrade(TurtleUpgradeType type, Component adjective, ItemStack stack) {
+    protected AbstractTurtleUpgrade(ResourceLocation id, TurtleUpgradeType type, String adjective, ItemStack stack) {
+        this.id = id;
         this.type = type;
         this.adjective = adjective;
         this.stack = stack;
     }
 
-    protected AbstractTurtleUpgrade(TurtleUpgradeType type, String adjective, ItemStack stack) {
-        this(type, Component.translatable(adjective), stack);
+    protected AbstractTurtleUpgrade(ResourceLocation id, TurtleUpgradeType type, ItemStack stack) {
+        this(id, type, UpgradeBase.getDefaultAdjective(id), stack);
     }
 
     @Override
-    public final Component getAdjective() {
+    public final ResourceLocation getUpgradeID() {
+        return id;
+    }
+
+    @Override
+    public final String getUnlocalisedAdjective() {
         return adjective;
     }
 
     @Override
-    public final TurtleUpgradeType getUpgradeType() {
+    public final TurtleUpgradeType getType() {
         return type;
     }
 

projects/common-api/src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java

@@ -12,13 +12,12 @@ import dan200.computercraft.api.upgrades.UpgradeBase;
 import dan200.computercraft.api.upgrades.UpgradeData;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
-import net.minecraft.core.component.DataComponentPatch;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.world.Container;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.Level;
 import org.jetbrains.annotations.ApiStatus;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * The interface passed to turtle by turtles, providing methods that they can call.
@@ -229,22 +228,37 @@ public interface ITurtleAccess {
      * @param side The side to get the upgrade from.
      * @return The upgrade on the specified side of the turtle, if there is one.
      * @see #getUpgradeWithData(TurtleSide)
-     * @see #setUpgrade(TurtleSide, UpgradeData)
+     * @see #setUpgradeWithData(TurtleSide, UpgradeData)
      */
     @Nullable
     ITurtleUpgrade getUpgrade(TurtleSide side);
 
     /**
-     * Returns the upgrade on the specified side of the turtle, along with its {@linkplain #getUpgradeData(TurtleSide)
+     * Returns the upgrade on the specified side of the turtle, along with its {@linkplain #getUpgradeNBTData(TurtleSide)
      * update data}.
      *
      * @param side The side to get the upgrade from.
      * @return The upgrade on the specified side of the turtle, along with its upgrade data, if there is one.
      * @see #getUpgradeWithData(TurtleSide)
-     * @see #setUpgrade(TurtleSide, UpgradeData)
+     * @see #setUpgradeWithData(TurtleSide, UpgradeData)
      */
-    @Nullable
-    UpgradeData<ITurtleUpgrade> getUpgradeWithData(TurtleSide side);
+    default @Nullable UpgradeData<ITurtleUpgrade> getUpgradeWithData(TurtleSide side) {
+        var upgrade = getUpgrade(side);
+        return upgrade == null ? null : UpgradeData.of(upgrade, getUpgradeNBTData(side));
+    }
+
+    /**
+     * Set the upgrade for a given side, resetting peripherals and clearing upgrade specific data.
+     *
+     * @param side    The side to set the upgrade on.
+     * @param upgrade The upgrade to set, may be {@code null} to clear.
+     * @see #getUpgrade(TurtleSide)
+     * @deprecated Use {@link #setUpgradeWithData(TurtleSide, UpgradeData)}
+     */
+    @Deprecated
+    default void setUpgrade(TurtleSide side, @Nullable ITurtleUpgrade upgrade) {
+        setUpgradeWithData(side, upgrade == null ? null : UpgradeData.ofDefault(upgrade));
+    }
 
     /**
      * Set the upgrade for a given side and its upgrade data.
@@ -253,7 +267,7 @@ public interface ITurtleAccess {
      * @param upgrade The upgrade to set, may be {@code null} to clear.
      * @see #getUpgradeWithData(TurtleSide)
      */
-    void setUpgrade(TurtleSide side, @Nullable UpgradeData<ITurtleUpgrade> upgrade);
+    void setUpgradeWithData(TurtleSide side, @Nullable UpgradeData<ITurtleUpgrade> upgrade);
 
     /**
      * Returns the peripheral created by the upgrade on the specified side of the turtle, if there is one.
@@ -267,23 +281,23 @@ public interface ITurtleAccess {
     /**
      * Get an upgrade-specific NBT compound, which can be used to store arbitrary data.
      * <p>
-     * This will be persisted across turtle restarts and chunk loads, as well as being synced to the client. You can
-     * call {@link #setUpgrade(TurtleSide, UpgradeData)} to modify it.
+     * This will be persisted across turtle restarts and chunk loads, as well as being synced to the client. You must
+     * call {@link #updateUpgradeNBTData(TurtleSide)} after modifying it.
      *
      * @param side The side to get the upgrade data for.
      * @return The upgrade-specific data.
-     * @see #setUpgradeData(TurtleSide, DataComponentPatch)
-     * @see UpgradeBase#getUpgradeItem(DataComponentPatch)
+     * @see #updateUpgradeNBTData(TurtleSide)
+     * @see UpgradeBase#getUpgradeItem(CompoundTag)
      * @see UpgradeBase#getUpgradeData(ItemStack)
      */
-    DataComponentPatch getUpgradeData(TurtleSide side);
+    CompoundTag getUpgradeNBTData(TurtleSide side);
 
     /**
-     * Update the upgrade-specific data.
+     * Mark the upgrade-specific data as dirty on a specific side. This is required for the data to be synced to the
+     * client and persisted.
      *
-     * @param side The side to set the upgrade data for.
-     * @param data The new upgrade data.
-     * @see #getUpgradeData(TurtleSide)
+     * @param side The side to mark dirty.
+     * @see #updateUpgradeNBTData(TurtleSide)
      */
-    void setUpgradeData(TurtleSide side, DataComponentPatch data);
+    void updateUpgradeNBTData(TurtleSide side);
 }

projects/common-api/src/main/java/dan200/computercraft/api/turtle/ITurtleUpgrade.java

@@ -4,97 +4,82 @@
 
 package dan200.computercraft.api.turtle;
 
-import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.api.upgrades.UpgradeBase;
-import dan200.computercraft.api.upgrades.UpgradeType;
-import dan200.computercraft.impl.ComputerCraftAPIService;
 import net.minecraft.core.Direction;
-import net.minecraft.core.Registry;
-import net.minecraft.core.component.DataComponentPatch;
-import net.minecraft.resources.ResourceKey;
-import net.minecraft.resources.ResourceLocation;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.Items;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
+import java.util.function.BiFunction;
 
 /**
  * The primary interface for defining an update for Turtles. A turtle update can either be a new tool, or a new
  * peripheral.
  * <p>
  * Turtle upgrades are defined in two stages. First, one creates a {@link ITurtleUpgrade} subclass and corresponding
- * {@link UpgradeType} instance, which are then registered in a registry.
+ * {@link TurtleUpgradeSerialiser} instance, which are then registered in a Minecraft registry.
  * <p>
  * You then write a JSON file in your mod's {@literal data/} folder. This is then parsed when the world is loaded, and
- * the upgrade automatically registered. It is recommended this is done via
- * <a href="../upgrades/UpgradeType.html#datagen">data generators</a>.
+ * the upgrade automatically registered.
  *
  * <h2>Example</h2>
- * {@snippet lang="java" :
- * // We use Forge's DeferredRegister to register our upgrade type. Fabric mods may register their type directly.
- * static final DeferredRegister<UpgradeType<? extends ITurtleUpgrade>> TURTLE_UPGRADES = DeferredRegister.create(ITurtleUpgrade.typeRegistry(), "my_mod");
+ * <h3>Registering the upgrade serialiser</h3>
+ * First, let's create a new class that implements {@link ITurtleUpgrade}. It is recommended to subclass
+ * {@link AbstractTurtleUpgrade}, as that provides a default implementation of most methods.
+ * <p>
+ * {@snippet class=com.example.examplemod.ExampleTurtleUpgrade region=body}
+ * <p>
+ * Now we must construct a new upgrade serialiser. In most cases, you can use one of the helper methods
+ * (e.g. {@link TurtleUpgradeSerialiser#simpleWithCustomItem(BiFunction)}), rather than defining your own implementation.
  *
- * // Register a new upgrade type called "my_upgrade".
- * public static final RegistryObject<UpgradeType<MyUpgrade>> MY_UPGRADE =
- *     TURTLE_UPGRADES.register("my_upgrade", () -> UpgradeType.simple(MyUpgrade::new));
+ * {@snippet class=com.example.examplemod.ExampleMod region=turtle_upgrades}
  *
- * // Then in your constructor
- * TURTLE_UPGRADES.register(bus);
- * }
+ * We now must register this upgrade serialiser. This is done the same way as you'd register blocks, items, or other
+ * Minecraft objects. The approach to do this will depend on mod-loader.
+ *
+ * <h4>Fabric</h4>
+ * {@snippet class=com.example.examplemod.FabricExampleMod region=turtle_upgrades}
+ *
+ * <h4>Forge</h4>
+ * {@snippet class=com.example.examplemod.ForgeExampleMod region=turtle_upgrades}
+ *
+ * <h3>Rendering the upgrade</h3>
+ * Next, we need to register a model for our upgrade. This is done by registering a
+ * {@link dan200.computercraft.api.client.turtle.TurtleUpgradeModeller} for your upgrade serialiser.
+ *
+ * <h4>Fabric</h4>
+ * {@snippet class=com.example.examplemod.FabricExampleModClient region=turtle_modellers}
+ *
+ *
+ * <h4>Forge</h4>
+ * {@snippet class=com.example.examplemod.FabricExampleModClient region=turtle_modellers}
+ *
+ * <h3>Registering the upgrade itself</h3>
+ * Upgrades themselves are loaded from datapacks when a level is loaded. In order to register our new upgrade, we must
+ * create a new JSON file at {@code data/<my_mod>/computercraft/turtle_upgrades/<my_upgrade_id>.json}.
+ *
+ * {@snippet file = data/examplemod/computercraft/turtle_upgrades/example_turtle_upgrade.json}
+ *
+ * The {@code "type"} field points to the ID of the upgrade serialiser we've just registered, while the other fields
+ * are read by the serialiser itself. As our upgrade was defined with {@link TurtleUpgradeSerialiser#simpleWithCustomItem(BiFunction)}, the
+ * {@code "item"} field will construct our upgrade with {@link Items#COMPASS}.
  * <p>
- * We can then define a new upgrade using JSON by placing the following in
- * {@code data/<my_mod>/computercraft/turtle_upgrade/<my_upgrade_id>.json}.
- * <p>
- * {@snippet lang="json" :
- * {
- *     "type": "my_mod:my_upgrade"
- * }
- * }
- * <p>
- * Finally, we need to register a model for our upgrade, see
- * {@link dan200.computercraft.api.client.turtle.TurtleUpgradeModeller} for more information.
+ * Rather than manually creating the file, it is recommended to data-generators to generate this file. This can be done
+ * with {@link TurtleUpgradeDataProvider}.
+ *
+ * {@snippet class=com.example.examplemod.data.TurtleDataProvider region=body}
+ *
+ * @see TurtleUpgradeSerialiser Registering a turtle upgrade.
  */
 public interface ITurtleUpgrade extends UpgradeBase {
-    /**
-     * The registry in which turtle upgrades are stored.
-     */
-    ResourceKey<Registry<ITurtleUpgrade>> REGISTRY = ResourceKey.createRegistryKey(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "turtle_upgrade"));
-
-    /**
-     * Create a {@link ResourceKey} for a turtle upgrade given a {@link ResourceLocation}.
-     * <p>
-     * This should only be called from within data generation code. Do not hard code references to your upgrades!
-     *
-     * @param id The id of the turtle upgrade.
-     * @return The upgrade registry key.
-     */
-    static ResourceKey<ITurtleUpgrade> createKey(ResourceLocation id) {
-        return ResourceKey.create(REGISTRY, id);
-    }
-
-    /**
-     * The registry key for turtle upgrade types.
-     *
-     * @return The registry key.
-     */
-    static ResourceKey<Registry<UpgradeType<? extends ITurtleUpgrade>>> typeRegistry() {
-        return ComputerCraftAPIService.get().turtleUpgradeRegistryId();
-    }
-
-    /**
-     * Get the type of this upgrade.
-     *
-     * @return The type of this upgrade.
-     */
-    @Override
-    UpgradeType<? extends ITurtleUpgrade> getType();
-
     /**
      * Return whether this turtle adds a tool or a peripheral to the turtle.
      *
      * @return The type of upgrade this is.
      * @see TurtleUpgradeType for the differences between them.
      */
-    TurtleUpgradeType getUpgradeType();
+    TurtleUpgradeType getType();
 
     /**
      * Will only be called for peripheral upgrades. Creates a peripheral for a turtle being placed using this upgrade.
@@ -153,7 +138,7 @@ public interface ITurtleUpgrade extends UpgradeBase {
      * @param upgradeData Data that currently stored for this upgrade
      * @return Filtered version of this data.
      */
-    default DataComponentPatch getPersistedData(DataComponentPatch upgradeData) {
+    default CompoundTag getPersistedData(CompoundTag upgradeData) {
         return upgradeData;
     }
 }

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleCommandResult.java

@@ -5,8 +5,7 @@
 package dan200.computercraft.api.turtle;
 
 import net.minecraft.core.Direction;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Used to indicate the result of executing a turtle command.
@@ -60,9 +59,9 @@ public final class TurtleCommandResult {
 
     private final boolean success;
     private final @Nullable String errorMessage;
-    private final @Nullable Object[] results;
+    private final @Nullable Object @Nullable [] results;
 
-    private TurtleCommandResult(boolean success, @Nullable String errorMessage, @Nullable Object[] results) {
+    private TurtleCommandResult(boolean success, @Nullable String errorMessage, @Nullable Object @Nullable [] results) {
         this.success = success;
         this.errorMessage = errorMessage;
         this.results = results;
@@ -92,8 +91,7 @@ public final class TurtleCommandResult {
      *
      * @return The command's result, or {@code null} if it was a failure.
      */
-    @Nullable
-    public Object[] getResults() {
+    public @Nullable Object @Nullable [] getResults() {
         return results;
     }
 }

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleSide.java

@@ -5,7 +5,7 @@
 package dan200.computercraft.api.turtle;
 
 /**
- * An enum representing the two sides of the turtle that a turtle turtle might reside.
+ * An enum representing the two sides of the turtle that a turtle upgrade might reside.
  */
 public enum TurtleSide {
     /**

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleToolBuilder.java

@@ -1,157 +0,0 @@
-// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.api.turtle;
-
-import dan200.computercraft.api.ComputerCraftTags;
-import dan200.computercraft.api.upgrades.UpgradeBase;
-import dan200.computercraft.impl.ComputerCraftAPIService;
-import dan200.computercraft.impl.upgrades.TurtleToolSpec;
-import net.minecraft.core.component.DataComponents;
-import net.minecraft.data.worldgen.BootstrapContext;
-import net.minecraft.network.chat.Component;
-import net.minecraft.resources.ResourceKey;
-import net.minecraft.resources.ResourceLocation;
-import net.minecraft.tags.TagKey;
-import net.minecraft.world.entity.ai.attributes.Attributes;
-import net.minecraft.world.item.Item;
-import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.level.block.Block;
-
-import javax.annotation.Nullable;
-import java.util.Optional;
-
-/**
- * A builder for custom turtle tool upgrades.
- * <p>
- * This can be used from your <a href="../upgrades/UpgradeType.html#datagen">data generator</a> code in order to
- * register turtle tools for your mod's tools.
- *
- * <h2>Example:</h2>
- * {@snippet lang = "java":
- * import net.minecraft.data.worldgen.BootstrapContext;
- * import net.minecraft.resources.ResourceLocation;
- * import net.minecraft.world.item.Items;
- *
- * public void registerTool(BootstrapContext<ITurtleUpgrade> upgrades) {
- *   TurtleToolBuilder.tool(ResourceLocation.fromNamespaceAndPath("my_mod", "wooden_pickaxe"), Items.WOODEN_PICKAXE).register(upgrades);
- * }
- *}
- */
-public final class TurtleToolBuilder {
-    private final ResourceKey<ITurtleUpgrade> id;
-    private final Item item;
-    private Component adjective;
-    private float damageMultiplier = TurtleToolSpec.DEFAULT_DAMAGE_MULTIPLIER;
-    private @Nullable TagKey<Block> breakable;
-    private boolean allowEnchantments = false;
-    private TurtleToolDurability consumeDurability = TurtleToolDurability.NEVER;
-
-    private TurtleToolBuilder(ResourceKey<ITurtleUpgrade> id, Item item) {
-        this.id = id;
-        adjective = Component.translatable(UpgradeBase.getDefaultAdjective(id.location()));
-        this.item = item;
-    }
-
-    public static TurtleToolBuilder tool(ResourceLocation id, Item item) {
-        return new TurtleToolBuilder(ITurtleUpgrade.createKey(id), item);
-    }
-
-    public static TurtleToolBuilder tool(ResourceKey<ITurtleUpgrade> id, Item item) {
-        return new TurtleToolBuilder(id, item);
-    }
-
-    /**
-     * Get the id for this turtle tool.
-     *
-     * @return The upgrade id.
-     */
-    public ResourceKey<ITurtleUpgrade> id() {
-        return id;
-    }
-
-    /**
-     * Specify a custom adjective for this tool. By default this takes its adjective from the upgrade id.
-     *
-     * @param adjective The new adjective to use.
-     * @return The tool builder, for further use.
-     */
-    public TurtleToolBuilder adjective(Component adjective) {
-        this.adjective = adjective;
-        return this;
-    }
-
-    /**
-     * The amount of damage a swing of this tool will do. This is multiplied by {@link Attributes#ATTACK_DAMAGE} to
-     * get the final damage.
-     *
-     * @param damageMultiplier The damage multiplier.
-     * @return The tool builder, for further use.
-     */
-    public TurtleToolBuilder damageMultiplier(float damageMultiplier) {
-        this.damageMultiplier = damageMultiplier;
-        return this;
-    }
-
-    /**
-     * Indicate that this upgrade allows items which have been {@linkplain ItemStack#isEnchanted() enchanted} or have
-     * {@linkplain DataComponents#ATTRIBUTE_MODIFIERS custom attribute modifiers}.
-     *
-     * @return The tool builder, for further use.
-     */
-    public TurtleToolBuilder allowEnchantments() {
-        allowEnchantments = true;
-        return this;
-    }
-
-    /**
-     * Set when the tool will consume durability.
-     *
-     * @param durability The durability predicate.
-     * @return The tool builder, for further use.
-     */
-    public TurtleToolBuilder consumeDurability(TurtleToolDurability durability) {
-        consumeDurability = durability;
-        return this;
-    }
-
-    /**
-     * Provide a list of breakable blocks. If not given, the tool can break all blocks. If given, only blocks
-     * in this tag, those in {@link ComputerCraftTags.Blocks#TURTLE_ALWAYS_BREAKABLE} and "insta-mine" ones can
-     * be broken.
-     *
-     * @param breakable The tag containing all blocks breakable by this item.
-     * @return The tool builder, for further use.
-     * @see ComputerCraftTags.Blocks
-     */
-    public TurtleToolBuilder breakable(TagKey<Block> breakable) {
-        this.breakable = breakable;
-        return this;
-    }
-
-    /**
-     * Build the turtle tool upgrade.
-     *
-     * @return The constructed upgrade.
-     */
-    public ITurtleUpgrade build() {
-        return ComputerCraftAPIService.get().createTurtleTool(new TurtleToolSpec(
-            adjective,
-            item,
-            damageMultiplier,
-            allowEnchantments,
-            consumeDurability,
-            Optional.ofNullable(breakable)
-        ));
-    }
-
-    /**
-     * Build this upgrade and register it for datagen.
-     *
-     * @param upgrades The registry this upgrade should be added to.
-     */
-    public void register(BootstrapContext<ITurtleUpgrade> upgrades) {
-        upgrades.register(id(), build());
-    }
-}

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleToolDurability.java

@@ -4,14 +4,14 @@
 
 package dan200.computercraft.api.turtle;
 
-import net.minecraft.core.component.DataComponents;
 import net.minecraft.util.StringRepresentable;
+import net.minecraft.world.entity.EquipmentSlot;
 import net.minecraft.world.item.ItemStack;
 
 /**
  * Indicates if an equipped turtle item will consume durability.
  *
- * @see TurtleToolBuilder#consumeDurability(TurtleToolDurability)
+ * @see TurtleUpgradeDataProvider.ToolBuilder#consumeDurability(TurtleToolDurability)
  */
 public enum TurtleToolDurability implements StringRepresentable {
     /**
@@ -21,7 +21,7 @@ public enum TurtleToolDurability implements StringRepresentable {
 
     /**
      * The equipped tool consumes durability if it is {@linkplain ItemStack#isEnchanted() enchanted} or has
-     * {@linkplain DataComponents#ATTRIBUTE_MODIFIERS custom attribute modifiers}.
+     * {@linkplain ItemStack#getAttributeModifiers(EquipmentSlot) custom attribute modifiers}.
      */
     WHEN_ENCHANTED("when_enchanted"),
 

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleUpgradeDataProvider.java

@@ -0,0 +1,171 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.turtle;
+
+import dan200.computercraft.api.ComputerCraftAPI;
+import dan200.computercraft.api.ComputerCraftTags;
+import dan200.computercraft.api.upgrades.UpgradeDataProvider;
+import dan200.computercraft.impl.PlatformHelper;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.data.DataGenerator;
+import net.minecraft.data.PackOutput;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.tags.TagKey;
+import net.minecraft.world.entity.EquipmentSlot;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+import net.minecraft.world.item.Item;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.block.Block;
+import org.jspecify.annotations.Nullable;
+
+import java.util.function.Consumer;
+
+/**
+ * A data provider to generate turtle upgrades.
+ * <p>
+ * This should be subclassed and registered to a {@link DataGenerator.PackGenerator}. Override the
+ * {@link #addUpgrades(Consumer)} function, construct each upgrade, and pass them off to the provided consumer to
+ * generate them.
+ *
+ * <h2>Example</h2>
+ * {@snippet class=com.example.examplemod.data.TurtleDataProvider region=body}
+ *
+ * @see TurtleUpgradeSerialiser
+ */
+public abstract class TurtleUpgradeDataProvider extends UpgradeDataProvider<ITurtleUpgrade, TurtleUpgradeSerialiser<?>> {
+    private static final ResourceLocation TOOL_ID = new ResourceLocation(ComputerCraftAPI.MOD_ID, "tool");
+
+    public TurtleUpgradeDataProvider(PackOutput output) {
+        super(output, "Turtle Upgrades", "computercraft/turtle_upgrades", TurtleUpgradeSerialiser.registryId());
+    }
+
+    /**
+     * Create a new turtle tool upgrade, such as a pickaxe or shovel.
+     *
+     * @param id   The ID of this tool.
+     * @param item The item used for tool actions. Note, this doesn't inherit all properties of the tool, you may need
+     *             to specify {@link ToolBuilder#damageMultiplier(float)} and {@link ToolBuilder#breakable(TagKey)}.
+     * @return A tool builder,
+     */
+    public final ToolBuilder tool(ResourceLocation id, Item item) {
+        return new ToolBuilder(id, existingSerialiser(TOOL_ID), item);
+    }
+
+    /**
+     * A builder for custom turtle tool upgrades.
+     *
+     * @see #tool(ResourceLocation, Item)
+     */
+    public static class ToolBuilder {
+        private final ResourceLocation id;
+        private final TurtleUpgradeSerialiser<?> serialiser;
+        private final Item toolItem;
+        private @Nullable String adjective;
+        private @Nullable Item craftingItem;
+        private @Nullable Float damageMultiplier = null;
+        private @Nullable TagKey<Block> breakable;
+        private boolean allowEnchantments = false;
+        private TurtleToolDurability consumeDurability = TurtleToolDurability.NEVER;
+
+        ToolBuilder(ResourceLocation id, TurtleUpgradeSerialiser<?> serialiser, Item toolItem) {
+            this.id = id;
+            this.serialiser = serialiser;
+            this.toolItem = toolItem;
+            craftingItem = null;
+        }
+
+        /**
+         * Specify a custom adjective for this tool. By default this takes its adjective from the tool item.
+         *
+         * @param adjective The new adjective to use.
+         * @return The tool builder, for further use.
+         */
+        public ToolBuilder adjective(String adjective) {
+            this.adjective = adjective;
+            return this;
+        }
+
+        /**
+         * Specify a custom item which is used to craft this upgrade. By default this is the same as the provided tool
+         * item, but you may wish to override it.
+         *
+         * @param craftingItem The item used to craft this upgrade.
+         * @return The tool builder, for further use.
+         */
+        public ToolBuilder craftingItem(Item craftingItem) {
+            this.craftingItem = craftingItem;
+            return this;
+        }
+
+        /**
+         * The amount of damage a swing of this tool will do. This is multiplied by {@link Attributes#ATTACK_DAMAGE} to
+         * get the final damage.
+         *
+         * @param damageMultiplier The damage multiplier.
+         * @return The tool builder, for further use.
+         */
+        public ToolBuilder damageMultiplier(float damageMultiplier) {
+            this.damageMultiplier = damageMultiplier;
+            return this;
+        }
+
+        /**
+         * Indicate that this upgrade allows items which have been {@linkplain ItemStack#isEnchanted() enchanted} or have
+         * {@linkplain ItemStack#getAttributeModifiers(EquipmentSlot) custom attribute modifiers}.
+         *
+         * @return The tool builder, for further use.
+         */
+        public ToolBuilder allowEnchantments() {
+            allowEnchantments = true;
+            return this;
+        }
+
+        /**
+         * Set when the tool will consume durability.
+         *
+         * @param durability The durability predicate.
+         * @return The tool builder, for further use.
+         */
+        public ToolBuilder consumeDurability(TurtleToolDurability durability) {
+            consumeDurability = durability;
+            return this;
+        }
+
+        /**
+         * Provide a list of breakable blocks. If not given, the tool can break all blocks. If given, only blocks
+         * in this tag, those in {@link ComputerCraftTags.Blocks#TURTLE_ALWAYS_BREAKABLE} and "insta-mine" ones can
+         * be broken.
+         *
+         * @param breakable The tag containing all blocks breakable by this item.
+         * @return The tool builder, for further use.
+         * @see ComputerCraftTags.Blocks
+         */
+        public ToolBuilder breakable(TagKey<Block> breakable) {
+            this.breakable = breakable;
+            return this;
+        }
+
+        /**
+         * Register this as an upgrade.
+         *
+         * @param add The callback given to {@link #addUpgrades(Consumer)}.
+         */
+        public void add(Consumer<Upgrade<TurtleUpgradeSerialiser<?>>> add) {
+            add.accept(new Upgrade<>(id, serialiser, s -> {
+                s.addProperty("item", PlatformHelper.get().getRegistryKey(Registries.ITEM, toolItem).toString());
+                if (adjective != null) s.addProperty("adjective", adjective);
+                if (craftingItem != null) {
+                    s.addProperty("craftItem", PlatformHelper.get().getRegistryKey(Registries.ITEM, craftingItem).toString());
+                }
+                if (damageMultiplier != null) s.addProperty("damageMultiplier", damageMultiplier);
+                if (breakable != null) s.addProperty("breakable", breakable.location().toString());
+                if (allowEnchantments) s.addProperty("allowEnchantments", true);
+                if (consumeDurability != TurtleToolDurability.NEVER) {
+                    s.addProperty("consumeDurability", consumeDurability.getSerializedName());
+                }
+            }));
+        }
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/turtle/TurtleUpgradeSerialiser.java

@@ -0,0 +1,83 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.turtle;
+
+import dan200.computercraft.api.upgrades.UpgradeBase;
+import dan200.computercraft.api.upgrades.UpgradeSerialiser;
+import dan200.computercraft.impl.ComputerCraftAPIService;
+import dan200.computercraft.impl.upgrades.SerialiserWithCraftingItem;
+import dan200.computercraft.impl.upgrades.SimpleSerialiser;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.crafting.RecipeSerializer;
+import net.minecraft.world.item.crafting.SimpleCraftingRecipeSerializer;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+/**
+ * Reads a {@link ITurtleUpgrade} from disk and reads/writes it to a network packet.
+ * <p>
+ * These should be registered in a {@link Registry} while the game is loading, much like {@link RecipeSerializer}s.
+ * <p>
+ * If your turtle upgrade doesn't have any associated configurable parameters (like most upgrades), you can use
+ * {@link #simple(Function)} or {@link #simpleWithCustomItem(BiFunction)} to create a basic upgrade serialiser.
+ *
+ * @param <T> The type of turtle upgrade this is responsible for serialising.
+ * @see ITurtleUpgrade
+ * @see TurtleUpgradeDataProvider
+ * @see dan200.computercraft.api.client.turtle.TurtleUpgradeModeller
+ */
+public interface TurtleUpgradeSerialiser<T extends ITurtleUpgrade> extends UpgradeSerialiser<T> {
+    /**
+     * The ID for the associated registry.
+     *
+     * @return The registry key.
+     */
+    static ResourceKey<Registry<TurtleUpgradeSerialiser<?>>> registryId() {
+        return ComputerCraftAPIService.get().turtleUpgradeRegistryId();
+    }
+
+    /**
+     * Create an upgrade serialiser for a simple upgrade. This is similar to a {@link SimpleCraftingRecipeSerializer},
+     * but for upgrades.
+     * <p>
+     * If you might want to vary the item, it's suggested you use {@link #simpleWithCustomItem(BiFunction)} instead.
+     *
+     * @param factory Generate a new upgrade with a specific ID.
+     * @param <T>     The type of the generated upgrade.
+     * @return The serialiser for this upgrade
+     */
+    static <T extends ITurtleUpgrade> TurtleUpgradeSerialiser<T> simple(Function<ResourceLocation, T> factory) {
+        final class Impl extends SimpleSerialiser<T> implements TurtleUpgradeSerialiser<T> {
+            private Impl(Function<ResourceLocation, T> constructor) {
+                super(constructor);
+            }
+        }
+
+        return new Impl(factory);
+    }
+
+    /**
+     * Create an upgrade serialiser for a simple upgrade whose crafting item can be specified.
+     *
+     * @param factory Generate a new upgrade with a specific ID and crafting item. The returned upgrade's
+     *                {@link UpgradeBase#getCraftingItem()} <strong>MUST</strong> equal the provided item.
+     * @param <T>     The type of the generated upgrade.
+     * @return The serialiser for this upgrade.
+     * @see #simple(Function)  For upgrades whose crafting stack should not vary.
+     */
+    static <T extends ITurtleUpgrade> TurtleUpgradeSerialiser<T> simpleWithCustomItem(BiFunction<ResourceLocation, ItemStack, T> factory) {
+        final class Impl extends SerialiserWithCraftingItem<T> implements TurtleUpgradeSerialiser<T> {
+            private Impl(BiFunction<ResourceLocation, ItemStack, T> factory) {
+                super(factory);
+            }
+        }
+
+        return new Impl(factory);
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/upgrades/UpgradeBase.java

@@ -9,34 +9,37 @@ import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.turtle.ITurtleAccess;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleSide;
+import dan200.computercraft.impl.PlatformHelper;
 import net.minecraft.Util;
-import net.minecraft.core.component.DataComponentPatch;
-import net.minecraft.network.chat.Component;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 
+import java.util.Objects;
+
 /**
  * Common functionality between {@link ITurtleUpgrade} and {@link IPocketUpgrade}.
  */
 public interface UpgradeBase {
     /**
-     * Get the type of this upgrade.
+     * Gets a unique identifier representing this type of turtle upgrade. eg: "computercraft:wireless_modem"
+     * or "my_mod:my_upgrade".
+     * <p>
+     * You should use a unique resource domain to ensure this upgrade is uniquely identified.
+     * The upgrade will fail registration if an already used ID is specified.
      *
-     * @return The type of this upgrade.
+     * @return The unique ID for this upgrade.
      */
-    UpgradeType<?> getType();
+    ResourceLocation getUpgradeID();
 
     /**
-     * A description of this upgrade for use in item names.
-     * <p>
-     * This should typically be a {@linkplain Component#translatable(String) translation key}, rather than a hard coded
-     * string.
+     * Return an unlocalised string to describe this type of computer in item names.
      * <p>
      * Examples of built-in adjectives are "Wireless", "Mining" and "Crafty".
      *
-     * @return The text component for this upgrade's adjective.
+     * @return The localisation key for this upgrade's adjective.
      */
-    Component getAdjective();
+    String getUnlocalisedAdjective();
 
     /**
      * Return an item stack representing the type of item that a computer must be crafted
@@ -54,8 +57,8 @@ public interface UpgradeBase {
     /**
      * Returns the item stack representing a currently equipped turtle upgrade.
      * <p>
-     * While upgrades can store upgrade data ({@link ITurtleAccess#getUpgradeData(TurtleSide)} and
-     * {@link IPocketAccess#getUpgradeData()}}, by default this data is discarded when an upgrade is unequipped,
+     * While upgrades can store upgrade data ({@link ITurtleAccess#getUpgradeNBTData(TurtleSide)} and
+     * {@link IPocketAccess#getUpgradeNBTData()}}, by default this data is discarded when an upgrade is unequipped,
      * and the original item stack is returned.
      * <p>
      * By overriding this method, you can create a new {@link ItemStack} which contains enough data to
@@ -67,24 +70,24 @@ public interface UpgradeBase {
      * @param upgradeData The current upgrade data. This should <strong>NOT</strong> be mutated.
      * @return The item stack returned when unequipping.
      */
-    default ItemStack getUpgradeItem(DataComponentPatch upgradeData) {
+    default ItemStack getUpgradeItem(CompoundTag upgradeData) {
         return getCraftingItem();
     }
 
     /**
      * Extract upgrade data from an {@link ItemStack}.
      * <p>
-     * This upgrade data will be available with {@link ITurtleAccess#getUpgradeData(TurtleSide)} or
-     * {@link IPocketAccess#getUpgradeData()}.
+     * This upgrade data will be available with {@link ITurtleAccess#getUpgradeNBTData(TurtleSide)} or
+     * {@link IPocketAccess#getUpgradeNBTData()}.
      * <p>
-     * This should be an inverse to {@link #getUpgradeItem(DataComponentPatch)}.
+     * This should be an inverse to {@link #getUpgradeItem(CompoundTag)}.
      *
      * @param stack The stack that was equipped by the turtle or pocket computer. This will have the same item as
      *              {@link #getCraftingItem()}.
      * @return The upgrade data that should be set on the turtle or pocket computer.
      */
-    default DataComponentPatch getUpgradeData(ItemStack stack) {
-        return DataComponentPatch.EMPTY;
+    default CompoundTag getUpgradeData(ItemStack stack) {
+        return new CompoundTag();
     }
 
     /**
@@ -94,15 +97,26 @@ public interface UpgradeBase {
      * the original stack. In order to prevent people losing items with enchantments (or
      * repairing items with non-0 damage), we impose additional checks on the item.
      * <p>
-     * The default check requires that any NBT is exactly the same as the crafting item,
-     * but this may be relaxed for your upgrade.
+     * The default check requires that any non-capability NBT is exactly the same as the
+     * crafting item, but this may be relaxed for your upgrade.
+     * <p>
+     * This is based on {@code net.minecraftforge.common.crafting.StrictNBTIngredient}'s check.
      *
      * @param stack The stack to check. This is guaranteed to be non-empty and have the same item as
      *              {@link #getCraftingItem()}.
      * @return If this stack may be used to equip this upgrade.
      */
     default boolean isItemSuitable(ItemStack stack) {
-        return ItemStack.isSameItemSameComponents(getCraftingItem(), stack);
+        var crafting = getCraftingItem();
+
+        // A more expanded form of ItemStack.areShareTagsEqual, but allowing an empty tag to be equal to a
+        // null one.
+        var shareTag = PlatformHelper.get().getShareTag(stack);
+        var craftingShareTag = PlatformHelper.get().getShareTag(crafting);
+        if (shareTag == craftingShareTag) return true;
+        if (shareTag == null) return Objects.requireNonNull(craftingShareTag).isEmpty();
+        if (craftingShareTag == null) return shareTag.isEmpty();
+        return shareTag.equals(craftingShareTag);
     }
 
     /**
@@ -111,7 +125,7 @@ public interface UpgradeBase {
      *
      * @param id The upgrade ID.
      * @return The  generated adjective.
-     * @see #getAdjective()
+     * @see #getUnlocalisedAdjective()
      */
     static String getDefaultAdjective(ResourceLocation id) {
         return Util.makeDescriptionId("upgrade", id) + ".adjective";

projects/common-api/src/main/java/dan200/computercraft/api/upgrades/UpgradeData.java

@@ -6,57 +6,59 @@ package dan200.computercraft.api.upgrades;
 
 import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
-import net.minecraft.core.Holder;
-import net.minecraft.core.component.DataComponentPatch;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.world.item.ItemStack;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.Nullable;
 
 /**
  * An upgrade (i.e. a {@link ITurtleUpgrade}) and its current upgrade data.
+ * <p>
+ * <strong>IMPORTANT:</strong> The {@link #data()} in an upgrade data is often a reference to the original upgrade data.
+ * Be careful to take a {@linkplain #copy() defensive copy} if you plan to use the data in this upgrade.
  *
- * @param holder The current upgrade holder.
- * @param data   The upgrade's data.
- * @param <T>    The type of upgrade, either {@link ITurtleUpgrade} or {@link IPocketUpgrade}.
+ * @param upgrade The current upgrade.
+ * @param data    The upgrade's data.
+ * @param <T>     The type of upgrade, either {@link ITurtleUpgrade} or {@link IPocketUpgrade}.
  */
-public record UpgradeData<T extends UpgradeBase>(Holder.Reference<T> holder, DataComponentPatch data) {
+public record UpgradeData<T extends UpgradeBase>(T upgrade, CompoundTag data) {
     /**
      * A utility method to construct a new {@link UpgradeData} instance.
      *
-     * @param holder An upgrade.
-     * @param data   The upgrade's data.
-     * @param <T>    The type of upgrade.
+     * @param upgrade An upgrade.
+     * @param data    The upgrade's data.
+     * @param <T>     The type of upgrade.
      * @return The new {@link UpgradeData} instance.
      */
-    public static <T extends UpgradeBase> UpgradeData<T> of(Holder.Reference<T> holder, DataComponentPatch data) {
-        return new UpgradeData<>(holder, data);
+    public static <T extends UpgradeBase> UpgradeData<T> of(T upgrade, CompoundTag data) {
+        return new UpgradeData<>(upgrade, data);
     }
 
     /**
      * Create an {@link UpgradeData} containing the default {@linkplain #data() data} for an upgrade.
      *
-     * @param holder The upgrade instance.
-     * @param <T>    The type of upgrade.
+     * @param upgrade The upgrade instance.
+     * @param <T>     The type of upgrade.
      * @return The default upgrade data.
      */
-    public static <T extends UpgradeBase> UpgradeData<T> ofDefault(Holder.Reference<T> holder) {
-        var upgrade = holder.value();
-        return of(holder, upgrade.getUpgradeData(upgrade.getCraftingItem()));
-    }
-
-    public UpgradeData {
-        if (!holder.isBound()) throw new IllegalArgumentException("Holder is not bound");
+    public static <T extends UpgradeBase> UpgradeData<T> ofDefault(T upgrade) {
+        return of(upgrade, upgrade.getUpgradeData(upgrade.getCraftingItem()));
     }
 
     /**
-     * Get the current upgrade.
+     * Take a copy of a (possibly {@code null}) {@link UpgradeData} instance.
      *
-     * @return The current upgrade.
+     * @param upgrade The copied upgrade data.
+     * @param <T>     The type of upgrade.
+     * @return The newly created upgrade data.
      */
-    public T upgrade() {
-        return holder().value();
+    @Contract("!null -> !null; null -> null")
+    public static <T extends UpgradeBase> @Nullable UpgradeData<T> copyOf(@Nullable UpgradeData<T> upgrade) {
+        return upgrade == null ? null : upgrade.copy();
     }
 
     /**
-     * Get the {@linkplain UpgradeBase#getUpgradeItem(DataComponentPatch) upgrade item} for this upgrade.
+     * Get the {@linkplain UpgradeBase#getUpgradeItem(CompoundTag) upgrade item} for this upgrade.
      * <p>
      * This returns a defensive copy of the item, to prevent accidental mutation of the upgrade data or original
      * {@linkplain UpgradeBase#getCraftingItem() upgrade stack}.
@@ -64,6 +66,16 @@ public record UpgradeData<T extends UpgradeBase>(Holder.Reference<T> holder, Dat
      * @return This upgrade's item.
      */
     public ItemStack getUpgradeItem() {
-        return upgrade().getUpgradeItem(data).copy();
+        return upgrade.getUpgradeItem(data).copy();
+    }
+
+    /**
+     * Take a copy of this {@link UpgradeData}. This returns a new instance with the same upgrade and a fresh copy of
+     * the upgrade data.
+     *
+     * @return A copy of the current instance.
+     */
+    public UpgradeData<T> copy() {
+        return new UpgradeData<>(upgrade(), data().copy());
     }
 }

projects/common-api/src/main/java/dan200/computercraft/api/upgrades/UpgradeDataProvider.java

@@ -0,0 +1,177 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.upgrades;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
+import dan200.computercraft.impl.PlatformHelper;
+import dan200.computercraft.impl.upgrades.SerialiserWithCraftingItem;
+import dan200.computercraft.impl.upgrades.SimpleSerialiser;
+import net.minecraft.Util;
+import net.minecraft.core.Registry;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.data.CachedOutput;
+import net.minecraft.data.DataProvider;
+import net.minecraft.data.PackOutput;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.Item;
+import org.jspecify.annotations.Nullable;
+
+import java.util.*;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+import java.util.function.Function;
+
+/**
+ * A data generator/provider for turtle and pocket computer upgrades. This should not be extended directly, instead see
+ * the other subclasses.
+ *
+ * @param <T> The base class of upgrades.
+ * @param <R> The upgrade serialiser to register for.
+ * @see dan200.computercraft.api.turtle.TurtleUpgradeDataProvider
+ * @see dan200.computercraft.api.pocket.PocketUpgradeDataProvider
+ */
+public abstract class UpgradeDataProvider<T extends UpgradeBase, R extends UpgradeSerialiser<? extends T>> implements DataProvider {
+    private final PackOutput output;
+    private final String name;
+    private final String folder;
+    private final ResourceKey<Registry<R>> registry;
+
+    private @Nullable List<T> upgrades;
+
+    protected UpgradeDataProvider(PackOutput output, String name, String folder, ResourceKey<Registry<R>> registry) {
+        this.output = output;
+        this.name = name;
+        this.folder = folder;
+        this.registry = registry;
+    }
+
+    /**
+     * Register an upgrade using a "simple" serialiser (e.g. {@link TurtleUpgradeSerialiser#simple(Function)}).
+     *
+     * @param id         The ID of the upgrade to create.
+     * @param serialiser The simple serialiser.
+     * @return The constructed upgrade, ready to be passed off to {@link #addUpgrades(Consumer)}'s consumer.
+     */
+    public final Upgrade<R> simple(ResourceLocation id, R serialiser) {
+        if (!(serialiser instanceof SimpleSerialiser)) {
+            throw new IllegalStateException(serialiser + " must be a simple() seriaiser.");
+        }
+
+        return new Upgrade<>(id, serialiser, s -> {
+        });
+    }
+
+    /**
+     * Register an upgrade using a "simple" serialiser (e.g. {@link TurtleUpgradeSerialiser#simple(Function)}).
+     *
+     * @param id         The ID of the upgrade to create.
+     * @param serialiser The simple serialiser.
+     * @param item       The crafting upgrade for this item.
+     * @return The constructed upgrade, ready to be passed off to {@link #addUpgrades(Consumer)}'s consumer.
+     */
+    public final Upgrade<R> simpleWithCustomItem(ResourceLocation id, R serialiser, Item item) {
+        if (!(serialiser instanceof SerialiserWithCraftingItem)) {
+            throw new IllegalStateException(serialiser + " must be a simpleWithCustomItem() serialiser.");
+        }
+
+        return new Upgrade<>(id, serialiser, s ->
+            s.addProperty("item", PlatformHelper.get().getRegistryKey(Registries.ITEM, item).toString())
+        );
+    }
+
+    /**
+     * Add all turtle or pocket computer upgrades.
+     *
+     * <h4>Example</h4>
+     * {@snippet class=com.example.examplemod.data.TurtleDataProvider region=body}
+     *
+     * @param addUpgrade A callback used to register an upgrade.
+     */
+    protected abstract void addUpgrades(Consumer<Upgrade<R>> addUpgrade);
+
+    @Override
+    public CompletableFuture<?> run(CachedOutput cache) {
+        var base = output.getOutputFolder().resolve("data");
+
+        Set<ResourceLocation> seen = new HashSet<>();
+        List<T> upgrades = new ArrayList<>();
+        List<CompletableFuture<?>> futures = new ArrayList<>();
+        addUpgrades(upgrade -> {
+            if (!seen.add(upgrade.id())) throw new IllegalStateException("Duplicate upgrade " + upgrade.id());
+
+            var json = new JsonObject();
+            json.addProperty("type", PlatformHelper.get().getRegistryKey(registry, upgrade.serialiser()).toString());
+            upgrade.serialise().accept(json);
+
+            futures.add(DataProvider.saveStable(cache, json, base.resolve(upgrade.id().getNamespace() + "/" + folder + "/" + upgrade.id().getPath() + ".json")));
+
+            try {
+                var result = upgrade.serialiser().fromJson(upgrade.id(), json);
+                upgrades.add(result);
+            } catch (IllegalArgumentException | JsonParseException e) {
+                LOGGER.error("Failed to parse {} {}", name, upgrade.id(), e);
+            }
+        });
+
+        this.upgrades = Collections.unmodifiableList(upgrades);
+        return Util.sequenceFailFast(futures);
+    }
+
+    @Override
+    public final String getName() {
+        return name;
+    }
+
+    public final R existingSerialiser(ResourceLocation id) {
+        var result = PlatformHelper.get().getRegistryObject(registry, id);
+        if (result == null) throw new IllegalArgumentException("No such serialiser " + registry);
+        return result;
+    }
+
+    public List<T> getGeneratedUpgrades() {
+        if (upgrades == null) throw new IllegalStateException("Upgrades have not been generated yet");
+        return upgrades;
+    }
+
+    /**
+     * A constructed upgrade instance, produced {@link #addUpgrades(Consumer)}.
+     *
+     * @param id         The ID for this upgrade.
+     * @param serialiser The serialiser which reads and writes this upgrade.
+     * @param serialise  Augment the generated JSON with additional fields.
+     * @param <R>        The type of upgrade serialiser.
+     */
+    public record Upgrade<R extends UpgradeSerialiser<?>>(
+        ResourceLocation id, R serialiser, Consumer<JsonObject> serialise
+    ) {
+        /**
+         * Convenience method for registering an upgrade.
+         *
+         * @param add The callback given to {@link #addUpgrades(Consumer)}
+         */
+        public void add(Consumer<Upgrade<R>> add) {
+            add.accept(this);
+        }
+
+        /**
+         * Return a new {@link Upgrade} which requires the given mod to be present.
+         * <p>
+         * This uses mod-loader-specific hooks (Forge's crafting conditions and Fabric's resource conditions). If using
+         * this in a multi-loader setup, you must generate resources separately for the two loaders.
+         *
+         * @param modId The id of the mod.
+         * @return A new upgrade instance.
+         */
+        public Upgrade<R> requireMod(String modId) {
+            return new Upgrade<>(id, serialiser, json -> {
+                PlatformHelper.get().addRequiredModCondition(json, modId);
+                serialise.accept(json);
+            });
+        }
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/api/upgrades/UpgradeSerialiser.java

@@ -0,0 +1,52 @@
+// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.api.upgrades;
+
+import com.google.gson.JsonObject;
+import dan200.computercraft.api.pocket.PocketUpgradeSerialiser;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.resources.ResourceLocation;
+
+
+/**
+ * Base interface for upgrade serialisers. This should generally not be implemented directly, instead implementing one
+ * of {@link TurtleUpgradeSerialiser} or {@link PocketUpgradeSerialiser}.
+ * <p>
+ * However, it may sometimes be useful to implement this if you have some shared logic between upgrade types.
+ *
+ * @param <T> The upgrade that this class can serialise and deserialise.
+ * @see TurtleUpgradeSerialiser
+ * @see PocketUpgradeSerialiser
+ */
+public interface UpgradeSerialiser<T extends UpgradeBase> {
+    /**
+     * Read this upgrade from a JSON file in a datapack.
+     *
+     * @param id     The ID of this upgrade.
+     * @param object The JSON object to load this upgrade from.
+     * @return The constructed upgrade, with a {@link UpgradeBase#getUpgradeID()} equal to {@code id}.
+     * @see net.minecraft.util.GsonHelper For additional JSON helper methods.
+     */
+    T fromJson(ResourceLocation id, JsonObject object);
+
+    /**
+     * Read this upgrade from a network packet, sent from the server.
+     *
+     * @param id     The ID of this upgrade.
+     * @param buffer The buffer object to read this upgrade from.
+     * @return The constructed upgrade, with a {@link UpgradeBase#getUpgradeID()} equal to {@code id}.
+     */
+    T fromNetwork(ResourceLocation id, FriendlyByteBuf buffer);
+
+    /**
+     * Write this upgrade to a network packet, to be sent to the client.
+     *
+     * @param buffer  The buffer object to write this upgrade to
+     * @param upgrade The upgrade to write.
+     */
+    void toNetwork(FriendlyByteBuf buffer, T upgrade);
+
+}

projects/common-api/src/main/java/dan200/computercraft/api/upgrades/UpgradeType.java

@@ -1,115 +0,0 @@
-// SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
-//
-// SPDX-License-Identifier: MPL-2.0
-
-package dan200.computercraft.api.upgrades;
-
-import com.mojang.serialization.MapCodec;
-import dan200.computercraft.api.pocket.IPocketUpgrade;
-import dan200.computercraft.api.turtle.ITurtleUpgrade;
-import dan200.computercraft.impl.upgrades.UpgradeTypeImpl;
-import net.minecraft.core.registries.BuiltInRegistries;
-import net.minecraft.data.registries.RegistryPatchGenerator;
-import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.item.crafting.Recipe;
-import net.minecraft.world.level.storage.loot.functions.LootItemFunction;
-
-import java.util.function.Function;
-
-/**
- * The type of a {@linkplain ITurtleUpgrade turtle} or {@linkplain IPocketUpgrade pocket} upgrade.
- * <p>
- * Turtle and pocket computer upgrades are registered using Minecraft's dynamic registry system. As a result, they
- * follow a similar design to other dynamic content, such as {@linkplain Recipe recipes} or {@link LootItemFunction
- * loot functions}.
- * <p>
- * First, one adds a new class implementing {@link ITurtleUpgrade} or {@link IPocketUpgrade}). This is responsible for
- * handling all the logic of your upgrade.
- * <p>
- * However, the upgrades are not registered directly. Instead, each upgrade class should have a corresponding
- * {@link UpgradeType}, which is responsible for loading the upgrade from a datapack. The upgrade type should then be
- * registered in its appropriate registry ({@link ITurtleUpgrade#typeRegistry()},
- * {@link IPocketUpgrade#typeRegistry()}).
- * <p>
- * In order to register the actual upgrade, a JSON file referencing your upgrade type should be added to a datapack. It
- * is recommended to do this via the data generators.
- *
- * <h2 id="datagen">Data Generation</h2>
- * As turtle and pocket upgrades are just loaded using vanilla's dynamic loaders, one may use the same data generation
- * tools as you would for any other dynamic registry.
- * <p>
- * This can typically be done by extending vanilla's built-in registries using {@link RegistryPatchGenerator}, and then
- * writing out the new registries using {@code net.fabricmc.fabric.api.datagen.v1.provider.FabricDynamicRegistryProvider}
- * on Fabric or {@code net.neoforged.neoforge.common.data.DatapackBuiltinEntriesProvider} on Forge.
- * <p>
- * {@snippet lang="java" :
- * import dan200.computercraft.api.turtle.ITurtleUpgrade;
- * import net.minecraft.Util;
- * import net.minecraft.core.HolderLookup;
- * import net.minecraft.core.RegistrySetBuilder;
- * import net.minecraft.data.DataGenerator;
- * import net.neoforged.neoforge.common.data.DatapackBuiltinEntriesProvider;
- *
- * import java.util.concurrent.CompletableFuture;
- *
- * public void generate(DataGenerator.PackGenerator output, CompletableFuture<HolderLookup.Provider> registries) {
- *     var newRegistries = RegistryPatchGenerator.createLookup(registries, Util.make(new RegistrySetBuilder(), builder -> {
- *         builder.add(ITurtleUpgrade.REGISTRY, upgrades -> {
- *             upgrades.register(ITurtleUpgrade.createKey(ResourceLocation.fromNamespaceAndPath("my_mod", "my_upgrade")), new MyUpgrade());
- *         });
- *     }));
- *     output.addProvider(o -> new DatapackBuiltinEntriesProvider(o, newRegistries, Set.of("my_mod")));
- * }
- * }
- *
- * @param <T> The upgrade subclass that this upgrade type represents.
- * @see ITurtleUpgrade
- * @see IPocketUpgrade
- */
-public interface UpgradeType<T extends UpgradeBase> {
-    /**
-     * The codec to read and write this upgrade from a datapack.
-     *
-     * @return The codec for this upgrade.
-     */
-    MapCodec<T> codec();
-
-    /**
-     * Create a new upgrade type.
-     *
-     * @param codec The codec
-     * @param <T>   The type of the generated upgrade.
-     * @return The newly created upgrade type.
-     */
-    static <T extends UpgradeBase> UpgradeType<T> create(MapCodec<T> codec) {
-        return new UpgradeTypeImpl<>(codec);
-    }
-
-    /**
-     * Create an upgrade type for an upgrade that takes no arguments.
-     * <p>
-     * If you might want to vary the item, it's suggested you use {@link #simpleWithCustomItem(Function)} instead.
-     *
-     * @param instance Generate a new upgrade with a specific ID.
-     * @param <T>      The type of the generated upgrade.
-     * @return A new upgrade type.
-     */
-    static <T extends UpgradeBase> UpgradeType<T> simple(T instance) {
-        return create(MapCodec.unit(instance));
-    }
-
-    /**
-     * Create an upgrade type for a simple upgrade whose crafting item can be specified.
-     *
-     * @param factory Generate a new upgrade with a specific ID and crafting item. The returned upgrade's
-     *                {@link UpgradeBase#getCraftingItem()} <strong>MUST</strong> equal the provided item.
-     * @param <T>     The type of the generated upgrade.
-     * @return A new upgrade type.
-     * @see #simple(UpgradeBase)  For upgrades whose crafting stack should not vary.
-     */
-    static <T extends UpgradeBase> UpgradeType<T> simpleWithCustomItem(Function<ItemStack, T> factory) {
-        return create(BuiltInRegistries.ITEM.byNameCodec()
-            .xmap(x -> factory.apply(new ItemStack(x)), x -> x.getCraftingItem().getItem())
-            .fieldOf("item"));
-    }
-}

projects/common-api/src/main/java/dan200/computercraft/impl/ComputerCraftAPIService.java

@@ -4,7 +4,6 @@
 
 package dan200.computercraft.impl;
 
-import com.mojang.serialization.Codec;
 import dan200.computercraft.api.ComputerCraftAPI;
 import dan200.computercraft.api.detail.BlockReference;
 import dan200.computercraft.api.detail.DetailRegistry;
@@ -13,15 +12,14 @@ import dan200.computercraft.api.filesystem.WritableMount;
 import dan200.computercraft.api.lua.GenericSource;
 import dan200.computercraft.api.lua.ILuaAPIFactory;
 import dan200.computercraft.api.media.MediaProvider;
+import dan200.computercraft.api.media.PrintoutContents;
 import dan200.computercraft.api.network.PacketNetwork;
 import dan200.computercraft.api.network.wired.WiredElement;
 import dan200.computercraft.api.network.wired.WiredNode;
-import dan200.computercraft.api.pocket.IPocketUpgrade;
+import dan200.computercraft.api.pocket.PocketUpgradeSerialiser;
 import dan200.computercraft.api.redstone.BundledRedstoneProvider;
-import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import dan200.computercraft.api.turtle.TurtleRefuelHandler;
-import dan200.computercraft.api.upgrades.UpgradeType;
-import dan200.computercraft.impl.upgrades.TurtleToolSpec;
+import dan200.computercraft.api.turtle.TurtleUpgradeSerialiser;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.core.Registry;
@@ -30,8 +28,7 @@ import net.minecraft.server.MinecraftServer;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.level.Level;
 import org.jetbrains.annotations.ApiStatus;
-
-import javax.annotation.Nullable;
+import org.jspecify.annotations.Nullable;
 
 /**
  * Backing interface for {@link ComputerCraftAPI}
@@ -70,20 +67,17 @@ public interface ComputerCraftAPIService {
 
     void registerRefuelHandler(TurtleRefuelHandler handler);
 
-    ResourceKey<Registry<UpgradeType<? extends ITurtleUpgrade>>> turtleUpgradeRegistryId();
+    ResourceKey<Registry<TurtleUpgradeSerialiser<?>>> turtleUpgradeRegistryId();
 
-    Codec<ITurtleUpgrade> turtleUpgradeCodec();
-
-    ResourceKey<Registry<UpgradeType<? extends IPocketUpgrade>>> pocketUpgradeRegistryId();
-
-    ITurtleUpgrade createTurtleTool(TurtleToolSpec spec);
-
-    Codec<IPocketUpgrade> pocketUpgradeCodec();
+    ResourceKey<Registry<PocketUpgradeSerialiser<?>>> pocketUpgradeRegistryId();
 
     DetailRegistry<ItemStack> getItemStackDetailRegistry();
 
     DetailRegistry<BlockReference> getBlockInWorldDetailRegistry();
 
+    @Nullable
+    PrintoutContents getPrintoutContents(ItemStack stack);
+
     final class Instance {
         static final @Nullable ComputerCraftAPIService INSTANCE;
         static final @Nullable Throwable ERROR;

projects/common-api/src/main/java/dan200/computercraft/impl/PlatformHelper.java

@@ -0,0 +1,91 @@
+// SPDX-FileCopyrightText: 2022 The CC: Tweaked Developers
+//
+// SPDX-License-Identifier: MPL-2.0
+
+package dan200.computercraft.impl;
+
+import com.google.gson.JsonObject;
+import dan200.computercraft.api.upgrades.UpgradeDataProvider;
+import net.minecraft.core.Registry;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.item.ItemStack;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Abstraction layer for Forge and Fabric. See implementations for more details.
+ * <p>
+ * Do <strong>NOT</strong> directly reference this class. It exists for internal use by the API.
+ */
+@ApiStatus.Internal
+public interface PlatformHelper {
+    /**
+     * Get the current {@link PlatformHelper} instance.
+     *
+     * @return The current instance.
+     */
+    static PlatformHelper get() {
+        var instance = Instance.INSTANCE;
+        return instance == null ? Services.raise(PlatformHelper.class, Instance.ERROR) : instance;
+    }
+
+    /**
+     * Get the unique ID for a registered object.
+     *
+     * @param registry The registry to look up this object in.
+     * @param object   The object to look up.
+     * @param <T>      The type of object the registry stores.
+     * @return The registered object's ID.
+     * @throws IllegalArgumentException If the registry or object are not registered.
+     */
+    <T> ResourceLocation getRegistryKey(ResourceKey<Registry<T>> registry, T object);
+
+    /**
+     * Look up an ID in a registry, returning the registered object.
+     *
+     * @param registry The registry to look up this object in.
+     * @param id       The ID to look up.
+     * @param <T>      The type of object the registry stores.
+     * @return The resolved registry object.
+     * @throws IllegalArgumentException If the registry or object are not registered.
+     */
+    <T> T getRegistryObject(ResourceKey<Registry<T>> registry, ResourceLocation id);
+
+    /**
+     * Get the subset of an {@link ItemStack}'s {@linkplain ItemStack#getTag() tag} which is synced to the client.
+     *
+     * @param item The stack.
+     * @return The item's tag.
+     */
+    @Nullable
+    default CompoundTag getShareTag(ItemStack item) {
+        return item.getTag();
+    }
+
+    /**
+     * Add a resource condition which requires a mod to be loaded. This should be used by data providers such as
+     * {@link UpgradeDataProvider}.
+     *
+     * @param object The JSON object we're generating.
+     * @param modId  The mod ID that we require.
+     */
+    void addRequiredModCondition(JsonObject object, String modId);
+
+    final class Instance {
+        static final @Nullable PlatformHelper INSTANCE;
+        static final @Nullable Throwable ERROR;
+
+        static {
+            // We don't want class initialisation to fail here (as that results in confusing errors). Instead, capture
+            // the error and rethrow it when accessing. This should be JITted away in the common case.
+            var helper = Services.tryLoad(PlatformHelper.class);
+            INSTANCE = helper.instance();
+            ERROR = helper.error();
+        }
+
+        private Instance() {
+        }
+    }
+}

projects/common-api/src/main/java/dan200/computercraft/impl/ServiceException.java

@@ -5,8 +5,8 @@
 package dan200.computercraft.impl;
 
 import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
 import java.io.Serial;
 
 /**

projects/common-api/src/main/java/dan200/computercraft/impl/Services.java

@@ -5,8 +5,8 @@
 package dan200.computercraft.impl;
 
 import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.Nullable;
 
-import javax.annotation.Nullable;
 import java.util.ServiceLoader;
 import java.util.stream.Collectors;