Port to Architectury

Yes, that also means Forge!
And yes, this was pain.
And no, the file size has not increased much!

fabric/build.gradle

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+plugins {
+    id "com.github.johnrengelman.shadow" version "7.1.2"
+}
+
+architectury {
+    platformSetupLoomIde()
+    fabric()
+}
+
+loom {
+}
+
+configurations {
+    common
+    shadowCommon // Don't use shadow from the shadow plugin because we don't want IDEA to index this.
+    compileClasspath.extendsFrom common
+    runtimeClasspath.extendsFrom common
+    developmentFabric.extendsFrom common
+}
+
+dependencies {
+    modImplementation "net.fabricmc:fabric-loader:${rootProject.fabric_loader_version}"
+    modApi "net.fabricmc.fabric-api:fabric-api:${rootProject.fabric_api_version}"
+
+    common(project(path: ":common", configuration: "namedElements")) { transitive false }
+    shadowCommon(project(path: ":common", configuration: "transformProductionFabric")) { transitive false }
+    common(project(path: ":fabric-like", configuration: "namedElements")) { transitive false }
+    shadowCommon(project(path: ":fabric-like", configuration: "transformProductionFabric")) { transitive false }
+}
+
+processResources {
+    inputs.property "version", project.version
+
+    filesMatching("fabric.mod.json") {
+        expand "version": project.version
+    }
+}
+
+shadowJar {
+    exclude "architectury.common.json"
+
+    configurations = [project.configurations.shadowCommon]
+    classifier "dev-shadow"
+}
+
+remapJar {
+    injectAccessWidener = true
+    input.set shadowJar.archiveFile
+    dependsOn shadowJar
+    classifier null
+}
+
+jar {
+    classifier "dev"
+}
+
+sourcesJar {
+    def commonSources = project(":common").sourcesJar
+    dependsOn commonSources
+    from commonSources.archiveFile.map { zipTree(it) }
+}
+
+components.java {
+    withVariantsFromConfiguration(project.configurations.shadowRuntimeElements) {
+        skip()
+    }
+}
+
+publishing {
+    publications {
+        mavenFabric(MavenPublication) {
+            artifactId = rootProject.archives_base_name + "-" + project.name
+            from components.java
+        }
+    }
+
+    // See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
+    repositories {
+        // Add repositories to publish to here.
+    }
+}

fabric/src/main/java/eu/midnightdust/fabric/core/MidnightLibClientFabric.java

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+package eu.midnightdust.fabric.core;
+
+import eu.midnightdust.core.MidnightLibClient;
+import eu.midnightdust.hats.witch.WitchHatFeatureRenderer;
+import eu.midnightdust.lib.util.MidnightColorUtil;
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
+import net.fabricmc.fabric.api.client.rendering.v1.EntityModelLayerRegistry;
+
+public class MidnightLibClientFabric implements ClientModInitializer {
+    @Override
+    public void onInitializeClient() {
+        EntityModelLayerRegistry.registerModelLayer(WitchHatFeatureRenderer.WITCH_HAT_MODEL_LAYER, WitchHatFeatureRenderer::getTexturedModelData);
+        MidnightLibClient.onInitializeClient();
+        ClientTickEvents.END_CLIENT_TICK.register(
+                client -> MidnightColorUtil.tick()
+        );
+    }
+}

fabric/src/main/java/eu/midnightdust/fabric/core/MidnightLibServerFabric.java

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+package eu.midnightdust.fabric.core;
+
+import eu.midnightdust.core.MidnightLibServer;
+import net.fabricmc.api.DedicatedServerModInitializer;
+
+public class MidnightLibServerFabric implements DedicatedServerModInitializer {
+    @Override
+    public void onInitializeServer() {
+        MidnightLibServer.onInitializeServer();
+    }
+}

fabric/src/main/java/eu/midnightdust/lib/util/fabric/PlatformVariablesImpl.java

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+package eu.midnightdust.lib.util.fabric;
+
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import eu.midnightdust.lib.util.PlatformVariables;
+import net.fabricmc.api.EnvType;
+import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.server.command.ServerCommandSource;
+
+import java.nio.file.Path;
+
+public class PlatformVariablesImpl {
+    /**
+     * This is our actual method to {@link PlatformVariables#getConfigDirectory()}.
+     */
+    public static Path getConfigDirectory() {
+        return FabricLoader.getInstance().getConfigDir();
+    }
+    public static boolean isClientEnv() {
+        return FabricLoader.getInstance().getEnvironmentType() == EnvType.CLIENT;
+    }
+    public static boolean isModLoaded(String modid) {
+        return FabricLoader.getInstance().isModLoaded(modid);
+    }
+    public static void registerCommand(LiteralArgumentBuilder<ServerCommandSource> command) {
+        CommandRegistrationCallback.EVENT.register((dispatcher, dedicated, registrationEnvironment) -> dispatcher.register(command));
+    }
+}

fabric/src/main/resources/fabric.mod.json

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+{
+  "schemaVersion": 1,
+  "id": "midnightlib",
+  "version": "${version}",
+
+  "name": "MidnightLib",
+  "description": "Common Library for Team MidnightDust's mods.",
+  "authors": [
+    "Motschen",
+    "TeamMidnightDust"
+  ],
+  "contact": {
+    "homepage": "https://www.midnightdust.eu/",
+    "sources": "https://github.com/TeamMidnightDust/MidnightLib",
+    "issues": "https://github.com/TeamMidnightDust/MidnightLib/issues"
+  },
+
+  "license": "MIT",
+  "icon": "assets/midnightlib/icon.png",
+
+  "environment": "*",
+  "entrypoints": {
+    "client": [
+      "eu.midnightdust.fabric.core.MidnightLibClientFabric"
+    ],
+    "server": [
+      "eu.midnightdust.fabric.core.MidnightLibServerFabric"
+    ],
+    "modmenu": [
+      "eu.midnightdust.lib.config.AutoModMenu"
+    ]
+  },
+
+  "mixins": [
+    "midnightlib.mixins.json"
+  ],
+
+  "custom": {
+    "modmenu": {
+      "links": {
+        "modmenu.discord": "https://discord.midnightdust.eu/",
+        "modmenu.website": "https://www.midnightdust.eu/",
+        "midnightlib.curseforge": "https://www.curseforge.com/minecraft/mc-mods/midnightlib",
+        "midnightlib.modrinth": "https://modrinth.com/mod/midnightlib",
+        "midnightlib.wiki": "https://github.com/TeamMidnightDust/MidnightLib/wiki"
+      },
+      "badges": [ "library" ]
+    }
+  }
+}