1 files changed, 58 insertions, 0 deletions
diff --git a/build-logic/src/main/kotlin/dokkabuild/DokkaBuildProperties.kt b/build-logic/src/main/kotlin/dokkabuild/DokkaBuildProperties.kt
new file mode 100644
index 00000000..ad39177c
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+++ b/build-logic/src/main/kotlin/dokkabuild/DokkaBuildProperties.kt
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2014-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dokkabuild
+
+import org.gradle.api.provider.Provider
+import org.gradle.api.provider.ProviderFactory
+import org.gradle.jvm.toolchain.JavaLanguageVersion
+import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+import javax.inject.Inject
+
+/**
+ * Common build properties used to build Dokka subprojects.
+ *
+ * This is an extension created by the [org.jetbrains.conventions.Base_gradle] convention plugin.
+ *
+ * Default values are set in the root `gradle.properties`, and can be overridden via
+ * [project properties](https://docs.gradle.org/current/userguide/build_environment.html#sec:project_properties)
+ */
+abstract class DokkaBuildProperties @Inject constructor(
+    private val providers: ProviderFactory,
+) {
+
+    /**
+     * The main version of Java that should be used to build Dokka source code.
+     *
+     * Updating the Java target is a breaking change.
+     */
+    val mainJavaVersion: Provider<JavaLanguageVersion> =
+        dokkaProperty("javaToolchain.mainCompiler", JavaLanguageVersion::of)
+
+    /**
+     * The version of Java that should be used to run Dokka tests.
+     *
+     * This value is set in CI/CD environments to make sure that Dokka still works with different
+     * versions of Java.
+     */
+    val testJavaLauncherVersion: Provider<JavaLanguageVersion> =
+        dokkaProperty("javaToolchain.testLauncher", JavaLanguageVersion::of)
+            .orElse(mainJavaVersion)
+
+    /**
+     * The Kotlin language level that Dokka artifacts are compiled to support.
+     *
+     * Updating the language level is a breaking change.
+     */
+    val kotlinLanguageLevel: Provider<KotlinVersion> =
+        dokkaProperty("kotlinLanguageLevel", KotlinVersion::fromVersion)
+
+
+    private fun <T : Any> dokkaProperty(name: String, convert: (String) -> T) =
+        providers.gradleProperty("org.jetbrains.dokka.$name").map(convert)
+
+    companion object {
+        const val EXTENSION_NAME = "dokkaBuild"
+    }
+}