1 files changed, 102 insertions, 0 deletions
diff --git a/build-logic/src/main/kotlin/dokkabuild.setup-maven-cli.gradle.kts b/build-logic/src/main/kotlin/dokkabuild.setup-maven-cli.gradle.kts
new file mode 100644
index 00000000..13d311a1
--- /dev/null
+++ b/build-logic/src/main/kotlin/dokkabuild.setup-maven-cli.gradle.kts
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2014-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+import org.gradle.kotlin.dsl.support.serviceOf
+
+/**
+ * Utility for downloading and installing a Maven binary.
+ *
+ * Provides the `setupMavenProperties` extension that contains the default versions and locations
+ * of the Maven binary.
+ *
+ * The task [installMavenBinary] will download and unzip the Maven bianry.
+ */
+
+plugins {
+    base
+}
+
+abstract class MavenCliSetupExtension {
+    abstract val mavenVersion: Property<String>
+    abstract val mavenPluginToolsVersion: Property<String>
+
+    /** Directory that will contain the unpacked Apache Maven dependency */
+    abstract val mavenInstallDir: DirectoryProperty
+
+    /**
+     * Path to the Maven executable.
+     *
+     * This should be different per OS:
+     *
+     * * Windows: `$mavenInstallDir/bin/mvn.cmd`
+     * * Unix: `$mavenInstallDir/bin/mvn`
+     */
+    abstract val mvn: RegularFileProperty
+}
+
+val mavenCliSetupExtension =
+    extensions.create("mavenCliSetup", MavenCliSetupExtension::class).apply {
+        mavenVersion.convention(libs.versions.apacheMaven.core)
+        mavenPluginToolsVersion.convention(libs.versions.apacheMaven.pluginTools)
+
+        mavenInstallDir.convention(layout.buildDirectory.dir("apache-maven"))
+
+        val isWindowsProvider =
+            providers.systemProperty("os.name").map { "win" in it.lowercase() }
+
+        mvn.convention(
+            providers.zip(mavenInstallDir, isWindowsProvider) { mavenInstallDir, isWindows ->
+                mavenInstallDir.file(
+                    when {
+                        isWindows -> "bin/mvn.cmd"
+                        else -> "bin/mvn"
+                    }
+                )
+            }
+        )
+    }
+
+val mavenBinary by configurations.registering {
+    description = "used to download the Maven binary"
+    isCanBeResolved = true
+    isCanBeConsumed = false
+    isVisible = false
+
+    defaultDependencies {
+        addLater(mavenCliSetupExtension.mavenVersion.map { mavenVersion ->
+            project.dependencies.create(
+                group = "org.apache.maven",
+                name = "apache-maven",
+                version = mavenVersion,
+                classifier = "bin",
+                ext = "zip"
+            )
+        })
+    }
+}
+
+tasks.clean {
+    delete(mavenCliSetupExtension.mavenInstallDir)
+}
+
+val installMavenBinary by tasks.registering(Sync::class) {
+    val archives = serviceOf<ArchiveOperations>()
+    from(
+        mavenBinary.flatMap { conf ->
+            @Suppress("UnstableApiUsage")
+            val resolvedArtifacts = conf.incoming.artifacts.resolvedArtifacts
+
+            resolvedArtifacts.map { artifacts ->
+                artifacts.map { archives.zipTree(it.file) }
+            }
+        }
+    ) {
+        eachFile {
+            // drop the first directory inside the zipped Maven bin (apache-maven-$version)
+            relativePath = RelativePath(true, *relativePath.segments.drop(1).toTypedArray())
+        }
+        includeEmptyDirs = false
+    }
+    into(mavenCliSetupExtension.mavenInstallDir)
+}