Script template provider for settings.gradle.kts files

This commit introduces GradleSettingsKotlinDSLTemplateProvider and
registers it as Kotlin IntelliJ plugin extension.

idea/idea-gradle/src/org/jetbrains/kotlin/idea/core/script/GradleScriptTemplateProvider.kt

@@ -88,10 +88,11 @@ abstract class AbstractGradleScriptTemplatesProvider(
     }
 }
 
-class GradleKotlinDSLTemplateProvider(project: Project) : AbstractGradleScriptTemplatesProvider(
+abstract class AbstractGradleKotlinDSLTemplateProvider(project: Project, private val templateClass: String)
+    : AbstractGradleScriptTemplatesProvider(
         project,
         "Gradle Kotlin DSL",
-        "org.gradle.kotlin.dsl.KotlinBuildScript",
+        templateClass,
         Regex("^gradle-(?:kotlin-dsl|core).*\\.jar\$")
 ) {
     // TODO_R: check this against kotlin-dsl branch that uses daemon
@@ -101,6 +102,12 @@ class GradleKotlinDSLTemplateProvider(project: Project) : AbstractGradleScriptTe
                 .firstOrNull()?.let(::listOf).orEmpty()
 }
 
+class GradleSettingsKotlinDSLTemplateProvider(project: Project)
+    : AbstractGradleKotlinDSLTemplateProvider(project, "org.gradle.kotlin.dsl.KotlinSettingsScript")
+
+class GradleKotlinDSLTemplateProvider(project: Project)
+    : AbstractGradleKotlinDSLTemplateProvider(project, "org.gradle.kotlin.dsl.KotlinBuildScript")
+
 class LegacyGradleScriptKotlinTemplateProvider(project: Project) : AbstractGradleScriptTemplatesProvider(
         project,
         "Gradle Script Kotlin",

idea/src/META-INF/gradle.xml

@@ -54,6 +54,9 @@
         <projectConfigurator implementation="org.jetbrains.kotlin.idea.configuration.KotlinJsGradleModuleConfigurator"/>
         <platformGradleDetector implementation="org.jetbrains.kotlin.idea.inspections.gradle.DefaultPlatformGradleDetector"/>
 
+        <scriptTemplatesProvider
+            implementation="org.jetbrains.kotlin.idea.core.script.GradleSettingsKotlinDSLTemplateProvider"/>
+
         <scriptTemplatesProvider
             implementation="org.jetbrains.kotlin.idea.core.script.GradleKotlinDSLTemplateProvider"/>