Migration detector for external systems (KT-23401)

idea/idea-jvm/src/org/jetbrains/kotlin/idea/configuration/KotlinExternalSystemSyncListener.kt

@@ -25,10 +25,12 @@ import org.jetbrains.kotlin.idea.configuration.ui.KotlinConfigurationCheckerComp
 class KotlinExternalSystemSyncListener : ExternalSystemTaskNotificationListenerAdapter() {
     override fun onStart(id: ExternalSystemTaskId, workingDir: String) {
         val project = id.findResolvedProject() ?: return
+        KotlinMigrationProjectComponent.getInstance(project).onImportAboutToStart()
         KotlinConfigurationCheckerComponent.getInstance(project).syncStarted()
     }
 
     override fun onEnd(id: ExternalSystemTaskId) {
+        // At this point changes might be still not applied to project structure yet.
         val project = id.findResolvedProject() ?: return
         KotlinConfigurationCheckerComponent.getInstance(project).syncDone()
     }

idea/src/META-INF/plugin.xml

@@ -64,6 +64,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.172

@@ -64,6 +64,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.173

@@ -64,6 +64,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.182

@@ -65,6 +65,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.as31

@@ -64,6 +64,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.as32

@@ -64,6 +64,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/META-INF/plugin.xml.as33

@@ -63,6 +63,9 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
       <interface-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</interface-class>
       <implementation-class>org.jetbrains.kotlin.idea.completion.CompletionBindingContextProvider</implementation-class>
     </component>
+    <component>
+      <implementation-class>org.jetbrains.kotlin.idea.configuration.KotlinMigrationProjectComponent</implementation-class>
+    </component>
   </project-components>
 
   <application-components>

idea/src/org/jetbrains/kotlin/idea/configuration/KotlinMigrationProjectComponent.kt

@@ -0,0 +1,177 @@
+/*
+ * 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.application.ApplicationManager
+import com.intellij.openapi.externalSystem.service.project.manage.ProjectDataImportListener
+import com.intellij.openapi.externalSystem.util.ExternalSystemApiUtil
+import com.intellij.openapi.module.ModuleManager
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.roots.ProjectRootManager
+import com.intellij.openapi.roots.libraries.Library
+import com.intellij.util.CommonProcessors
+import com.intellij.util.text.VersionComparatorUtil
+import org.jetbrains.kotlin.config.ApiVersion
+import org.jetbrains.kotlin.config.LanguageVersion
+import org.jetbrains.kotlin.config.LanguageVersionSettings
+import org.jetbrains.kotlin.config.LanguageVersionSettingsImpl
+import org.jetbrains.kotlin.idea.framework.GRADLE_SYSTEM_ID
+import org.jetbrains.kotlin.idea.framework.MAVEN_SYSTEM_ID
+import org.jetbrains.kotlin.idea.project.languageVersionSettings
+import org.jetbrains.kotlin.idea.util.application.runReadAction
+import org.jetbrains.kotlin.idea.versions.LibInfo
+
+class KotlinMigrationProjectComponent(val project: Project) {
+    private var old: MigrationState? = null
+    private var new: MigrationState? = null
+
+    init {
+        val connection = project.messageBus.connect()
+        connection.subscribe(ProjectDataImportListener.TOPIC, ProjectDataImportListener {
+            KotlinMigrationProjectComponent.getInstance(project).onImportFinished()
+        })
+    }
+
+    @Synchronized
+    fun onImportAboutToStart() {
+        old = MigrationState.build(project)
+    }
+
+    @Synchronized
+    fun onImportFinished() {
+        new = MigrationState.build(project)
+
+        val migrationInfo = prepareMigrationInfo(old, new) ?: return
+
+        if (ApplicationManager.getApplication().isUnitTestMode) {
+            return
+        }
+
+        ApplicationManager.getApplication().invokeLater {
+            // Notify
+        }
+    }
+
+    companion object {
+        fun getInstance(project: Project): KotlinMigrationProjectComponent =
+            project.getComponent(KotlinMigrationProjectComponent::class.java)!!
+
+        private fun prepareMigrationInfo(old: MigrationState?, new: MigrationState?): MigrationInfo? {
+            if (old == null || new == null) {
+                return null
+            }
+
+            val oldLibraryVersion = old.stdlibInfo?.version
+            val newLibraryVersion = new.stdlibInfo?.version
+
+            if (oldLibraryVersion == null || newLibraryVersion == null) {
+                return null
+            }
+
+            if (VersionComparatorUtil.COMPARATOR.compare(newLibraryVersion, oldLibraryVersion) > 0 ||
+                old.apiVersion < new.apiVersion || old.languageVersion < new.languageVersion
+            ) {
+                return MigrationInfo(
+                    oldLibraryVersion, newLibraryVersion,
+                    old.apiVersion, new.apiVersion,
+                    old.languageVersion, new.languageVersion
+                )
+            }
+
+            return null
+        }
+    }
+}
+
+private class MigrationState(
+    var stdlibInfo: LibInfo?,
+    var apiVersion: ApiVersion,
+    var languageVersion: LanguageVersion
+) {
+    companion object {
+        fun build(project: Project): MigrationState {
+            val libraries = maxKotlinLibVersion(project)
+            val languageVersionSettings = collectMaxCompilerSettings(project)
+            return MigrationState(libraries, languageVersionSettings.apiVersion, languageVersionSettings.languageVersion)
+        }
+    }
+}
+
+internal data class MigrationInfo(
+    val oldStdlibVersion: String,
+    val newStdlibVersion: String,
+    val oldApiVersion: ApiVersion,
+    val newApiVersion: ApiVersion,
+    val oldLanguageVersion: LanguageVersion,
+    val newLanguageVersion: LanguageVersion
+)
+
+private const val KOTLIN_GROUP_ID = "org.jetbrains.kotlin"
+
+private fun maxKotlinLibVersion(project: Project): LibInfo? {
+    return runReadAction {
+        var maxStdlibInfo: LibInfo? = null
+
+        val allLibProcessor = CommonProcessors.CollectUniquesProcessor<Library>()
+        ProjectRootManager.getInstance(project).orderEntries().forEachLibrary(allLibProcessor)
+
+        for (library in allLibProcessor.results) {
+            if (!ExternalSystemApiUtil.isExternalSystemLibrary(library, GRADLE_SYSTEM_ID) &&
+                !ExternalSystemApiUtil.isExternalSystemLibrary(library, MAVEN_SYSTEM_ID)
+            ) {
+                continue
+            }
+
+            if (library.name?.contains(" $KOTLIN_GROUP_ID:kotlin-stdlib") != true) {
+                continue
+            }
+
+            val libName = library.name ?: continue
+
+            val version = libName.substringAfterLastNullable(":") ?: continue
+            val artifactId = libName.substringBeforeLastNullable(":")?.substringAfterLastNullable(":") ?: continue
+
+            if (version.isBlank() || artifactId.isBlank()) continue
+
+            if (maxStdlibInfo == null || VersionComparatorUtil.COMPARATOR.compare(version, maxStdlibInfo.version) > 0) {
+                maxStdlibInfo = LibInfo(KOTLIN_GROUP_ID, artifactId, version)
+            }
+        }
+
+        maxStdlibInfo
+    }
+}
+
+private fun collectMaxCompilerSettings(project: Project): LanguageVersionSettings {
+    return runReadAction {
+        var maxApiVersion: ApiVersion? = null
+        var maxLanguageVersion: LanguageVersion? = null
+
+        for (module in ModuleManager.getInstance(project).modules) {
+            val languageVersionSettings = module.languageVersionSettings
+
+            if (maxApiVersion == null || languageVersionSettings.apiVersion > maxApiVersion) {
+                maxApiVersion = languageVersionSettings.apiVersion
+            }
+
+            if (maxLanguageVersion == null || languageVersionSettings.languageVersion > maxLanguageVersion) {
+                maxLanguageVersion = languageVersionSettings.languageVersion
+            }
+        }
+
+        LanguageVersionSettingsImpl(maxLanguageVersion ?: LanguageVersion.LATEST_STABLE, maxApiVersion ?: ApiVersion.LATEST_STABLE)
+    }
+}
+
+fun String.substringBeforeLastNullable(delimiter: String, missingDelimiterValue: String? = null): String? {
+    val index = lastIndexOf(delimiter)
+    return if (index == -1) missingDelimiterValue else substring(0, index)
+}
+
+fun String.substringAfterLastNullable(delimiter: String, missingDelimiterValue: String? = null): String? {
+    val index = lastIndexOf(delimiter)
+    return if (index == -1) missingDelimiterValue else substring(index + 1, length)
+}

idea/src/org/jetbrains/kotlin/idea/versions/KotlinRuntimeLibraryUtil.kt

@@ -280,7 +280,8 @@ val LOG = Logger.getInstance("org.jetbrains.kotlin.idea.versions.KotlinRuntimeLi
 
 data class LibInfo(
     val groupId: String,
-    val name: String
+    val name: String,
+    val version: String = "0.0.0"
 )
 
 data class DeprecatedLibInfo(

idea/src/org/jetbrains/kotlin/idea/versions/KotlinRuntimeLibraryUtil.kt.172

@@ -280,7 +280,8 @@ val LOG = Logger.getInstance("org.jetbrains.kotlin.idea.versions.KotlinRuntimeLi
 
 data class LibInfo(
     val groupId: String,
-    val name: String
+    val name: String,
+    val version: String = "0.0.0"
 )
 
 data class DeprecatedLibInfo(