Import Kotlin code style from Maven properties (KT-23400)

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinCodeStyleMavenImporter.kt

@@ -0,0 +1,56 @@
+/*
+ * 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.maven
+
+import com.intellij.openapi.externalSystem.service.project.IdeModifiableModelsProvider
+import com.intellij.openapi.module.Module
+import org.jetbrains.idea.maven.importing.MavenImporter
+import org.jetbrains.idea.maven.importing.MavenRootModelAdapter
+import org.jetbrains.idea.maven.project.MavenProject
+import org.jetbrains.idea.maven.project.MavenProjectChanges
+import org.jetbrains.idea.maven.project.MavenProjectsProcessorTask
+import org.jetbrains.idea.maven.project.MavenProjectsTree
+import org.jetbrains.kotlin.idea.formatter.ProjectCodeStyleImporter
+import org.jetbrains.kotlin.idea.maven.KotlinMavenImporter.Companion.KOTLIN_PLUGIN_ARTIFACT_ID
+import org.jetbrains.kotlin.idea.maven.KotlinMavenImporter.Companion.KOTLIN_PLUGIN_GROUP_ID
+
+class KotlinCodeStyleMavenImporter : MavenImporter(KOTLIN_PLUGIN_GROUP_ID, KOTLIN_PLUGIN_ARTIFACT_ID) {
+    companion object {
+        private const val KOTLIN_CODE_STYLE_MAVEN_SETTING = "kotlin.code.style"
+
+        fun getCodeStyleString(mavenProject: MavenProject): String? {
+            return mavenProject.properties.getProperty(KOTLIN_CODE_STYLE_MAVEN_SETTING)
+        }
+    }
+
+    override fun isApplicable(mavenProject: MavenProject): Boolean {
+        return getCodeStyleString(mavenProject) != null
+    }
+
+    override fun preProcess(
+        module: Module?,
+        mavenProject: MavenProject?,
+        changes: MavenProjectChanges?,
+        modifiableModelsProvider: IdeModifiableModelsProvider?
+    ) {
+        // Do nothing
+    }
+
+    override fun process(
+        modifiableModelsProvider: IdeModifiableModelsProvider?,
+        module: Module,
+        rootModel: MavenRootModelAdapter?,
+        mavenModel: MavenProjectsTree,
+        mavenProject: MavenProject,
+        changes: MavenProjectChanges?,
+        mavenProjectToModuleName: MutableMap<MavenProject, String>?,
+        postTasks: MutableList<MavenProjectsProcessorTask>
+    ) {
+        if (mavenProject !in mavenModel.rootProjects) return
+
+        ProjectCodeStyleImporter.apply(module.project, getCodeStyleString(mavenProject))
+    }
+}

idea/idea-maven/test/org/jetbrains/kotlin/idea/maven/KotlinMavenImporterTest.kt

@@ -24,6 +24,7 @@ import com.intellij.openapi.roots.CompilerModuleExtension
 import com.intellij.openapi.roots.LibraryOrderEntry
 import com.intellij.openapi.roots.ModuleRootManager
 import com.intellij.openapi.roots.impl.libraries.LibraryEx
+import com.intellij.psi.codeStyle.CodeStyleSettingsManager
 import com.intellij.util.PathUtil
 import junit.framework.TestCase
 import org.jetbrains.jps.model.java.JavaResourceRootType
@@ -36,6 +37,9 @@ import org.jetbrains.kotlin.idea.caches.project.productionSourceInfo
 import org.jetbrains.kotlin.idea.caches.project.testSourceInfo
 import org.jetbrains.kotlin.idea.caches.resolve.analyzeAndGetResult
 import org.jetbrains.kotlin.idea.facet.KotlinFacet
+import org.jetbrains.kotlin.idea.formatter.KotlinObsoleteCodeStyle
+import org.jetbrains.kotlin.idea.formatter.KotlinStyleGuideCodeStyle
+import org.jetbrains.kotlin.idea.formatter.kotlinCodeStyleDefaults
 import org.jetbrains.kotlin.idea.framework.CommonLibraryKind
 import org.jetbrains.kotlin.idea.framework.JSLibraryKind
 import org.jetbrains.kotlin.idea.framework.KotlinSdkType
@@ -267,6 +271,48 @@ class KotlinMavenImporterTest : MavenImportingTestCase() {
         assertTestSources("project", "src/test/java", "src/test/kotlin")
     }
 
+    fun testImportObsoleteCodeStyle() {
+        Assert.assertNull(CodeStyleSettingsManager.getSettings(myProject).kotlinCodeStyleDefaults())
+
+        importProject(
+            """
+            <groupId>test</groupId>
+            <artifactId>project</artifactId>
+            <version>1.0.0</version>
+
+            <properties>
+                <kotlin.code.style>obsolete</kotlin.code.style>
+            </properties>
+            """
+        )
+
+        Assert.assertEquals(
+            KotlinObsoleteCodeStyle.CODE_STYLE_ID,
+            CodeStyleSettingsManager.getSettings(myProject).kotlinCodeStyleDefaults()
+        )
+    }
+
+    fun testImportOfficialCodeStyle() {
+        Assert.assertNull(CodeStyleSettingsManager.getSettings(myProject).kotlinCodeStyleDefaults())
+
+        importProject(
+            """
+            <groupId>test</groupId>
+            <artifactId>project</artifactId>
+            <version>1.0.0</version>
+
+            <properties>
+                <kotlin.code.style>official</kotlin.code.style>
+            </properties>
+            """
+        )
+
+        Assert.assertEquals(
+            KotlinStyleGuideCodeStyle.CODE_STYLE_ID,
+            CodeStyleSettingsManager.getSettings(myProject).kotlinCodeStyleDefaults()
+        )
+    }
+
     fun testReImportRemoveDir() {
         createProjectSubDirs("src/main/kotlin", "src/main/kotlin.jvm", "src/test/kotlin", "src/test/kotlin.jvm")
 

idea/src/META-INF/maven.xml

@@ -17,6 +17,8 @@
 
   <extensions defaultExtensionNs="org.jetbrains.idea.maven">
     <importer implementation="org.jetbrains.kotlin.idea.maven.KotlinMavenImporter" />
+    <importer implementation="org.jetbrains.kotlin.idea.maven.KotlinCodeStyleMavenImporter" />
+
     <archetypesProvider implementation="org.jetbrains.kotlin.idea.maven.KotlinMavenArchetypesProvider" />
 
     <pluginDescriptor mavenId="org.jetbrains.kotlin:kotlin-maven-plugin">