[build] Restructure to composite build

conventions/helpers/build.gradle.kts

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+plugins {
+	`kotlin-dsl`
+	`java-gradle-plugin`
+}
+
+gradlePlugin {
+	plugins.register("minecraftModComponent") {
+		id = "de.siphalor.tweed5.minecraft.mod.component"
+		implementationClass = "de.siphalor.tweed5.gradle.plugin.minecraft.mod.MinecraftModComponentPlugin"
+	}
+}

conventions/helpers/src/main/kotlin/de/siphalor/tweed5/gradle/plugin/minecraft/mod/MinecraftModComponentPlugin.kt

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+package de.siphalor.tweed5.gradle.plugin.minecraft.mod
+
+import org.gradle.api.JavaVersion
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.attributes.Bundling
+import org.gradle.api.attributes.Category
+import org.gradle.api.attributes.DocsType
+import org.gradle.api.attributes.LibraryElements
+import org.gradle.api.attributes.Usage
+import org.gradle.api.attributes.java.TargetJvmVersion
+import org.gradle.api.component.SoftwareComponentFactory
+import org.gradle.api.model.ObjectFactory
+import org.gradle.api.tasks.compile.JavaCompile
+import org.gradle.kotlin.dsl.named
+import javax.inject.Inject
+
+abstract class MinecraftModComponentPlugin : Plugin<Project> {
+	@get:Inject
+	abstract val softwareComponentFactory: SoftwareComponentFactory
+
+	@get:Inject
+	abstract val objectFactory: ObjectFactory
+
+	override fun apply(project: Project) {
+		val modComponent = softwareComponentFactory.adhoc("minecraftMod")
+		project.components.add(modComponent)
+
+		val targetJvmVersion = project.tasks.named<JavaCompile>("compileJava")
+			.map { JavaVersion.toVersion(it.targetCompatibility).majorVersion }
+
+		val modElementsConfiguration = project.configurations.consumable("minecraftModElements") {
+			attributes {
+				attribute(MinecraftModded.MINECRAFT_MODDED_ATTRIBUTE, objectFactory.named(MinecraftModded.MODDED))
+				attribute(Category.CATEGORY_ATTRIBUTE, objectFactory.named(Category.LIBRARY))
+				attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objectFactory.named(LibraryElements.JAR))
+				attribute(Bundling.BUNDLING_ATTRIBUTE, objectFactory.named(Bundling.SHADOWED))
+				attribute(Usage.USAGE_ATTRIBUTE, objectFactory.named(Usage.JAVA_RUNTIME))
+
+				project.afterEvaluate {
+					attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, targetJvmVersion.get().toInt())
+				}
+			}
+		}
+
+		val apiConfiguration = project.configurations.named("api")
+		val modSourcesElementsConfiguration = project.configurations.consumable("minecraftModSourcesElements") {
+			extendsFrom(apiConfiguration.get())
+			attributes {
+				attribute(MinecraftModded.MINECRAFT_MODDED_ATTRIBUTE, objectFactory.named(MinecraftModded.MODDED))
+				attribute(Category.CATEGORY_ATTRIBUTE, objectFactory.named(Category.DOCUMENTATION))
+				attribute(DocsType.DOCS_TYPE_ATTRIBUTE, objectFactory.named(DocsType.SOURCES))
+				attribute(Bundling.BUNDLING_ATTRIBUTE, objectFactory.named(Bundling.EXTERNAL))
+			}
+		}
+
+		modComponent.addVariantsFromConfiguration(modElementsConfiguration.get()) {
+			mapToMavenScope("runtime")
+		}
+		modComponent.addVariantsFromConfiguration(modSourcesElementsConfiguration.get()) {
+			mapToOptional()
+		}
+	}
+}

conventions/helpers/src/main/kotlin/de/siphalor/tweed5/gradle/plugin/minecraft/mod/MinecraftModded.kt

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+package de.siphalor.tweed5.gradle.plugin.minecraft.mod
+
+import org.gradle.api.Named
+import org.gradle.api.attributes.Attribute
+
+interface MinecraftModded : Named {
+	companion object {
+		val MINECRAFT_MODDED_ATTRIBUTE = Attribute.of("de.siphalor.tweed5.minecraft.modded", MinecraftModded::class.java)
+		const val PLAIN = "plain"
+		const val MODDED = "modded"
+	}
+}