GradleBuildRootsManager: check gradle version change in gradle-wrapper.properties

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/roots/GradleBuildRootsLocator.kt

@@ -28,10 +28,12 @@ abstract class GradleBuildRootsLocator {
     private val VirtualFile.localPath
         get() = path
 
+    private val gradleWrapperEnding = "/gradle/wrapper/gradle-wrapper.properties"
+
     fun maybeAffectedGradleProjectFile(filePath: String): Boolean =
         filePath.endsWith("/gradle.properties") ||
                 filePath.endsWith("/gradle.local") ||
-                filePath.endsWith("/gradle-wrapper.properties") ||
+                filePath.endsWith(gradleWrapperEnding) ||
                 filePath.endsWith(".gradle.kts")
 
     fun isAffectedGradleProjectFile(filePath: String): Boolean =
@@ -43,14 +45,18 @@ abstract class GradleBuildRootsLocator {
             filePath.endsWith("/gradle.local")
         ) {
             return roots.getBuildByProjectDir(filePath.substringBeforeLast("/"))
-        } else if (filePath.endsWith("/gradle-wrapper.properties")) {
-            val gradleWrapperDirIndex = filePath.lastIndexOfOrNull('/') ?: return null
-            val gradleDirIndex = filePath.lastIndexOfOrNull('/', gradleWrapperDirIndex - 1) ?: return null
-            val buildDirIndex = filePath.lastIndexOfOrNull('/', gradleDirIndex - 1) ?: return null
-            return roots.getBuildByRootDir(filePath.substring(0, buildDirIndex))
         }
 
-        return findScriptBuildRoot(filePath, searchNearestLegacy = false)?.root as? GradleBuildRoot
+        return findGradleWrapperPropertiesBuildDir(filePath)?.let { roots.getBuildByRootDir(it) }
+            ?: findScriptBuildRoot(filePath, searchNearestLegacy = false)?.root
+    }
+
+    fun findGradleWrapperPropertiesBuildDir(filePath: String): String? {
+        if (filePath.endsWith(gradleWrapperEnding)) {
+            return filePath.substring(0, filePath.length - gradleWrapperEnding.length)
+        }
+
+        return null
     }
 
     @Suppress("EnumEntryName")

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/roots/GradleBuildRootsManager.kt

@@ -36,6 +36,7 @@ import java.nio.file.FileSystems
 import java.nio.file.Files
 import java.nio.file.Paths
 import java.nio.file.attribute.BasicFileAttributes
+import java.util.concurrent.ConcurrentLinkedQueue
 import java.util.concurrent.atomic.AtomicBoolean
 
 /**
@@ -110,7 +111,7 @@ class GradleBuildRootsManager(val project: Project) : GradleBuildRootsLocator(),
 
     fun fileChanged(filePath: String, ts: Long = System.currentTimeMillis()) {
         findAffectedFileRoot(filePath)?.fileChanged(filePath, ts)
-        scheduleLastModifiedFilesSave()
+        scheduleModifiedFilesCheck(filePath)
     }
 
     fun markImportingInProgress(workingDir: String, inProgress: Boolean = true) {
@@ -156,22 +157,39 @@ class GradleBuildRootsManager(val project: Project) : GradleBuildRootsLocator(),
         return GradleBuildRootData(new.importTs, roots, new.templateClasspath, models.values)
     }
 
-    private val lastModifiedFilesSaveScheduled = AtomicBoolean()
+    private val modifiedFilesCheckScheduled = AtomicBoolean()
+    private val modifiedFiles = ConcurrentLinkedQueue<String>()
 
-    fun scheduleLastModifiedFilesSave() {
-        if (lastModifiedFilesSaveScheduled.compareAndSet(false, true)) {
+    fun scheduleModifiedFilesCheck(filePath: String) {
+        modifiedFiles.add(filePath)
+        if (modifiedFilesCheckScheduled.compareAndSet(false, true)) {
             BackgroundTaskUtil.executeOnPooledThread(project) {
-                if (lastModifiedFilesSaveScheduled.compareAndSet(true, false)) {
-                    updateNotifications(restartAnalyzer = false) { true }
-
-                    roots.list.forEach {
-                        it.saveLastModifiedFiles()
-                    }
+                if (modifiedFilesCheckScheduled.compareAndSet(true, false)) {
+                    checkModifiedFiles()
                 }
             }
         }
     }
 
+    private fun checkModifiedFiles() {
+        updateNotifications(restartAnalyzer = false) { true }
+
+        roots.list.forEach {
+            it.saveLastModifiedFiles()
+        }
+
+        // process modifiedFiles queue
+        while (true) {
+            val file = modifiedFiles.poll() ?: break
+
+            // detect gradle version change
+            val buildDir = findGradleWrapperPropertiesBuildDir(file)
+            if (buildDir != null) {
+                actualizeBuildRoot(buildDir)
+            }
+        }
+    }
+
     fun updateStandaloneScripts(update: StandaloneScriptsUpdater.() -> Unit) {
         val changes = StandaloneScriptsUpdater.collectChanges(delegate = roots, update)