Import code style if gradle.properties has kotlin.code.style option (KT-23400)

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinObsoleteCodeStyle.kt

@@ -21,6 +21,7 @@ class KotlinObsoleteCodeStyle : KotlinPredefinedCodeStyle(CODE_STYLE_TITLE, Kotl
         val INSTANCE = KotlinObsoleteCodeStyle()
 
         const val CODE_STYLE_ID = "KOTLIN_OLD_DEFAULTS"
+        const val CODE_STYLE_SETTING = "obsolete"
         const val CODE_STYLE_TITLE = "Kotlin obsolete IntelliJ IDEA codestyle"
 
         fun apply(settings: CodeStyleSettings) {

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinStyleGuideCodeStyle.kt

@@ -32,6 +32,7 @@ class KotlinStyleGuideCodeStyle : KotlinPredefinedCodeStyle("Kotlin style guide"
         val INSTANCE = KotlinStyleGuideCodeStyle()
 
         const val CODE_STYLE_ID = "KOTLIN_OFFICIAL"
+        const val CODE_STYLE_SETTING = "official"
         const val CODE_STYLE_TITLE = "Kotlin Coding Conventions"
 
         fun apply(settings: CodeStyleSettings) {

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/GradlePropertiesFileUtils.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2018 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.
+ */
+
+package org.jetbrains.kotlin.idea.configuration
+
+import com.intellij.openapi.project.Project
+import java.util.*
+
+internal object GradlePropertiesFileUtils {
+    const val KOTLIN_CODE_STYLE_GRADLE_SETTING = "kotlin.code.style"
+
+    private const val GRADLE_PROPERTIES_FILE_NAME = "gradle.properties"
+    private const val GRADLE_PROPERTIES_LOCAL_FILE_NAME = "local.properties"
+
+    private val gradlePropertyFiles = listOf(GRADLE_PROPERTIES_LOCAL_FILE_NAME, GRADLE_PROPERTIES_FILE_NAME)
+
+    fun readProperty(project: Project, propertyName: String): String? {
+        for (propertyFileName in gradlePropertyFiles) {
+            val propertyFile = project.baseDir.findChild(propertyFileName) ?: continue
+            val properties = Properties()
+            properties.load(propertyFile.inputStream)
+            properties.getProperty(propertyName)?.let {
+                return it
+            }
+        }
+
+        return null
+    }
+}

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinGradleSourceSetDataService.kt

@@ -42,6 +42,9 @@ import org.jetbrains.kotlin.gradle.ArgsInfo
 import org.jetbrains.kotlin.gradle.CompilerArgumentsBySourceSet
 import org.jetbrains.kotlin.idea.compiler.configuration.KotlinCommonCompilerArgumentsHolder
 import org.jetbrains.kotlin.idea.facet.*
+import org.jetbrains.kotlin.idea.formatter.KotlinObsoleteCodeStyle
+import org.jetbrains.kotlin.idea.formatter.KotlinStyleGuideCodeStyle
+import org.jetbrains.kotlin.idea.formatter.ProjectCodeStyleImporter
 import org.jetbrains.kotlin.idea.framework.CommonLibraryKind
 import org.jetbrains.kotlin.idea.framework.JSLibraryKind
 import org.jetbrains.kotlin.idea.framework.detectLibraryKind
@@ -95,7 +98,7 @@ class KotlinGradleProjectSettingsDataService : AbstractProjectDataService<Projec
             if (settings.useProjectSettings) null else settings
         }
         val languageVersion = allSettings.asSequence().mapNotNullTo(LinkedHashSet()) { it.languageLevel }.singleOrNull()
-        val apiVersion = allSettings.asSequence().mapNotNullTo(LinkedHashSet()) { it.apiLevel}.singleOrNull()
+        val apiVersion = allSettings.asSequence().mapNotNullTo(LinkedHashSet()) { it.apiLevel }.singleOrNull()
         KotlinCommonCompilerArgumentsHolder.getInstance(project).update {
             if (languageVersion != null) {
                 this.languageVersion = languageVersion.versionString
@@ -145,6 +148,15 @@ class KotlinGradleProjectDataService : AbstractProjectDataService<ModuleData, Vo
             val kotlinFacet = configureFacetByGradleModule(ideModule, modelsProvider, moduleNode, null) ?: continue
             GradleProjectImportHandler.getInstances(project).forEach { it.importByModule(kotlinFacet, moduleNode) }
         }
+
+        val property = GradlePropertiesFileUtils.readProperty(project, GradlePropertiesFileUtils.KOTLIN_CODE_STYLE_GRADLE_SETTING)
+        when (property) {
+            KotlinObsoleteCodeStyle.CODE_STYLE_SETTING ->
+                ProjectCodeStyleImporter.apply(project, KotlinObsoleteCodeStyle.INSTANCE)
+            KotlinStyleGuideCodeStyle.CODE_STYLE_SETTING ->
+                ProjectCodeStyleImporter.apply(project, KotlinStyleGuideCodeStyle.INSTANCE)
+            else -> return
+        }
     }
 }
 
@@ -260,7 +272,7 @@ fun configureFacetByGradleModule(
     }
 
     val compilerVersion = moduleNode.findAll(BuildScriptClasspathData.KEY).firstOrNull()?.data?.let(::findKotlinPluginVersion)
-            ?: return null
+        ?: return null
     val platformKind = detectPlatformKindByPlugin(moduleNode) ?: detectPlatformByLibrary(moduleNode)
 
     // TODO there should be a way to figure out the correct platform version
@@ -326,15 +338,7 @@ internal fun adjustClasspath(kotlinFacet: KotlinFacet, dependencyClasspath: List
     arguments.classpath = if (newClasspath.isNotEmpty()) newClasspath.joinToString(File.pathSeparator) else null
 }
 
-private val gradlePropertyFiles = listOf("local.properties", "gradle.properties")
-
 internal fun findKotlinCoroutinesProperty(project: Project): String {
-    for (propertyFileName in gradlePropertyFiles) {
-        val propertyFile = project.baseDir.findChild(propertyFileName) ?: continue
-        val properties = Properties()
-        properties.load(propertyFile.inputStream)
-        properties.getProperty("kotlin.coroutines")?.let { return it }
-    }
-
-    return CoroutineSupport.getCompilerArgument(LanguageFeature.Coroutines.defaultState)
+    return GradlePropertiesFileUtils.readProperty(project, "kotlin.coroutines")
+        ?: CoroutineSupport.getCompilerArgument(LanguageFeature.Coroutines.defaultState)
 }