Build: Extract build cache setup to kotlin-build-gradle-plugin

dependencies/kotlin-build-gradle-plugin/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 group = "org.jetbrains.kotlin"
-version = "0.0.4"
+version = "0.0.5"
 
 repositories {
     mavenCentral()

dependencies/kotlin-build-gradle-plugin/src/BuildCache.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+import org.gradle.api.initialization.Settings
+import org.gradle.caching.http.HttpBuildCache
+import java.net.URI
+
+
+fun Settings.setupBuildCache() {
+    buildCache.local.isEnabled = kotlinBuildProperties.localBuildCacheEnabled
+    kotlinBuildProperties.buildCacheUrl?.let { remoteCacheUrl ->
+        buildCache.remote(HttpBuildCache::class.java) { remoteCache ->
+            remoteCache.url = URI(remoteCacheUrl)
+            remoteCache.isPush = kotlinBuildProperties.pushToBuildCache
+        }
+    }
+}