Explicit misconfiguration signalization

buildSrc/build.gradle.kts

@@ -122,7 +122,7 @@ allprojects {
     }
 }
 
-// TODO: These classes should be omitted once Gradle plugin supports local.properties
+// TODO: hide these classes in special gradle plugin for kotlin-ultimate which will support local.properties
 class LocalBuildPropertiesProvider(private val project: Project) {
     private val localProperties: Properties = Properties()
 

buildSrc/src/main/kotlin/buildProperties.kt

@@ -62,12 +62,19 @@ class KotlinBuildProperties(
 
     val isTeamcityBuild: Boolean = getBoolean("teamcity") || System.getenv("TEAMCITY_VERSION") != null
 
-    val intellijUltimateEnabled: Boolean = kotlinUltimateExists && (getBoolean("intellijUltimateEnabled") || isTeamcityBuild)
+    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)
+        }
 }
 
 private const val extensionName = "kotlinBuildFlags"
 
-class ProjectProperties(val project: Project): PropertiesProvider {
+class ProjectProperties(val project: Project) : PropertiesProvider {
     override val rootProjectDir: File
         get() = project.projectDir
 
@@ -80,7 +87,7 @@ val Project.kotlinBuildProperties: KotlinBuildProperties
             rootProject.extensions.add(extensionName, it)
         }
 
-class SettingsProperties(val settings: Settings): PropertiesProvider {
+class SettingsProperties(val settings: Settings) : PropertiesProvider {
     override val rootProjectDir: File
         get() = settings.rootDir