Build: Add kotlin-build-gradle-plugin & use it prebuilt from bintray

With extracted buildProperties.kt from buildSrc required for settings.gradle, using buildSrc classes is not allowed there since gradle 6.0

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

@@ -0,0 +1,56 @@
+plugins {
+    kotlin("jvm") version "1.3.50"
+    `maven-publish`
+}
+
+group = "org.jetbrains.kotlin"
+version = "0.0.1"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation(kotlin("stdlib-jdk8"))
+    implementation(gradleApi())
+}
+
+tasks {
+    compileKotlin {
+        kotlinOptions.jvmTarget = "1.8"
+    }
+    compileTestKotlin {
+        kotlinOptions.jvmTarget = "1.8"
+    }
+}
+
+sourceSets {
+    main {
+        java.setSrcDirs(listOf("src"))
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("KotlinBuildGradlePlugin") {
+            from(components["java"])
+        }
+    }
+
+    repositories {
+        maven {
+            name = "bintray"
+            url = uri("https://api.bintray.com/maven/kotlin/kotlin-dependencies/kotlin-build-gradle-plugin")
+            authentication {
+                val mavenUser = findProperty("kotlin.bintray.user") as String?
+                val mavenPass = findProperty("kotlin.bintray.password") as String?
+                if (mavenUser != null && mavenPass != null) {
+                    credentials {
+                        username = mavenUser
+                        password = mavenPass
+                    }
+                }
+            }
+        }
+    }
+}

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

@@ -0,0 +1,2 @@
+rootProject.name = "kotlin-build-gradle-plugin"
+

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

@@ -0,0 +1,119 @@
+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. 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.
+ */
+
+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, default: Boolean = false): Boolean =
+        this[key]?.toString()?.trim()?.toBoolean() ?: default
+
+    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 && getBoolean("kotlin.build.java9", true)
+
+    val useBootstrapStdlib: Boolean
+        get() = isInJpsBuildIdeaSync || getBoolean("kotlin.build.useBootstrapStdlib", false)
+
+    private val kotlinUltimateExists: Boolean = propertiesProvider.rootProjectDir.resolve("kotlin-ultimate").exists()
+
+    val isTeamcityBuild: Boolean = getBoolean("teamcity") || System.getenv("TEAMCITY_VERSION") != null
+
+    val intellijUltimateEnabled: Boolean
+        get() {
+            val explicitlyEnabled = getBoolean("intellijUltimateEnabled")
+            if (!kotlinUltimateExists && explicitlyEnabled) {
+                error("intellijUltimateEnabled property is set, while kotlin-ultimate repository is not provided")
+            }
+            return kotlinUltimateExists && (explicitlyEnabled || isTeamcityBuild)
+        }
+
+    val includeCidrPlugins: Boolean = kotlinUltimateExists && getBoolean("cidrPluginsEnabled")
+
+    val includeUltimate: Boolean = kotlinUltimateExists && (isTeamcityBuild || intellijUltimateEnabled)
+
+    val postProcessing: Boolean get() = isTeamcityBuild || getBoolean("kotlin.build.postprocessing", true)
+
+    val relocation: Boolean get() = postProcessing
+
+    val proguard: Boolean get() = postProcessing && getBoolean("kotlin.build.proguard", isTeamcityBuild)
+
+    val jsIrDist: Boolean get() = getBoolean("kotlin.stdlib.js.ir.dist")
+
+    val jarCompression: Boolean get() = getBoolean("kotlin.build.jar.compression", isTeamcityBuild)
+}
+
+private const val extensionName = "kotlinBuildProperties"
+
+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)
+        }