Build: support local.properties for JPS build. Apply JPS related tweaks only inside IDEA import.

buildSrc/src/main/kotlin/buildProperties.kt

@@ -0,0 +1,88 @@
+import org.gradle.api.Project
+import org.gradle.api.initialization.Settings
+import org.gradle.api.internal.DynamicObjectAware
+import java.io.File
+import java.util.*
+
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+interface PropertiesProvider {
+    val rootProjectDir: File
+    fun getProperty(key: String): Any?
+}
+
+class KotlinBuildProperties(
+    private val propertiesProvider: PropertiesProvider
+) {
+    private val localProperties: Properties = Properties()
+
+    init {
+        val localPropertiesFile = propertiesProvider.rootProjectDir.resolve("local.properties")
+        if (localPropertiesFile.isFile) {
+            localPropertiesFile.reader().use(localProperties::load)
+        }
+    }
+
+    private operator fun get(key: String): Any? = localProperties.getProperty(key) ?: propertiesProvider.getProperty(key)
+
+    private fun getBoolean(key: String): Boolean = this[key]?.toString() == "true"
+
+    val isJpsBuildEnabled: Boolean = getBoolean("jpsBuild")
+
+    val isInIdeaSync: Boolean = run {
+        // "idea.sync.active" was introduced in 2019.1
+        System.getProperty("idea.sync.active")?.toBoolean() == true || let {
+            // before 2019.1 there is "idea.active" that was true only on sync,
+            // but since 2019.1 "idea.active" present in task execution too.
+            // So let's check Idea version
+            val majorIdeaVersion = System.getProperty("idea.version")
+                ?.split(".")
+                ?.getOrNull(0)
+            val isBeforeIdea2019 = majorIdeaVersion == null || majorIdeaVersion.toInt() < 2019
+
+            isBeforeIdea2019 && System.getProperty("idea.active")?.toBoolean() == true
+        }
+    }
+
+    val isInJpsBuildIdeaSync: Boolean
+        get() = isJpsBuildEnabled && isInIdeaSync
+
+    val includeJava9: Boolean
+        get() = !isInJpsBuildIdeaSync
+}
+
+private const val extensionName = "kotlinBuildFlags"
+
+class ProjectProperties(val project: Project): PropertiesProvider {
+    override val rootProjectDir: File
+        get() = project.projectDir
+
+    override fun getProperty(key: String): Any? = project.findProperty(key)
+}
+
+val Project.kotlinBuildProperties: KotlinBuildProperties
+    get() = rootProject.extensions.findByName(extensionName) as KotlinBuildProperties?
+        ?: KotlinBuildProperties(ProjectProperties(rootProject)).also {
+            rootProject.extensions.add(extensionName, it)
+        }
+
+class SettingsProperties(val settings: Settings): PropertiesProvider {
+    override val rootProjectDir: File
+        get() = settings.rootDir
+
+    override fun getProperty(key: String): Any? {
+        val obj = (settings as DynamicObjectAware).asDynamicObject
+        return if (obj.hasProperty(key)) obj.getProperty(key) else null
+    }
+}
+
+fun getKotlinBuildPropertiesForSettings(settings: Any) = (settings as Settings).kotlinBuildProperties
+
+val Settings.kotlinBuildProperties: KotlinBuildProperties
+    get() = extensions.findByName(extensionName) as KotlinBuildProperties?
+        ?: KotlinBuildProperties(SettingsProperties(this)).also {
+            extensions.add(extensionName, it)
+        }

buildSrc/src/main/kotlin/dependencies.kt

@@ -1,12 +1,14 @@
-@file:Suppress("unused") // usages in build scripts are not tracked properly
+@file:Suppress("unused")
 
+// usages in build scripts are not tracked properly
+
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.api.GradleException
 import org.gradle.api.Project
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.artifacts.dsl.DependencyHandler
 import org.gradle.api.file.ConfigurableFileCollection
 import org.gradle.api.tasks.AbstractCopyTask
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.kotlin.dsl.extra
 import org.gradle.kotlin.dsl.project
 import java.io.File
@@ -73,8 +75,8 @@ fun Project.ideaUltimatePreloadedDeps(vararg artifactBaseNames: String, subdir:
 
 fun Project.kotlinDep(artifactBaseName: String, version: String): String = "org.jetbrains.kotlin:kotlin-$artifactBaseName:$version"
 
-val Project.useBootstrapStdlib: Boolean get() =
-    findProperty("jpsBuild")?.toString() == "true"
+val Project.useBootstrapStdlib: Boolean
+    get() = kotlinBuildProperties.isInJpsBuildIdeaSync
 
 fun Project.kotlinStdlib(suffix: String? = null): Any {
     return if (useBootstrapStdlib)