do not allow to invoke rename refactoring (part of EDU-441)

python/educational/interactive-learning/resources/META-INF/plugin.xml

@@ -61,9 +61,6 @@
             text="Fill Answer Placeholders">
       <add-to-group group-id="HelpMenu" anchor="first"/>
     </action>
-    <action overrides="true"  id="RenameElement" class="com.jetbrains.edu.learning.actions.StudyRenameTaskFileAction"
-      text="Rename..."
-    />
 
   </actions>
 
@@ -86,6 +83,7 @@
     <highlightErrorFilter implementation="com.jetbrains.edu.learning.editor.StudyHighlightErrorFilter"/>
     <projectService serviceInterface="com.jetbrains.edu.learning.StudyTaskManager"
                     serviceImplementation="com.jetbrains.edu.learning.StudyTaskManager"/>
-     <extendWordSelectionHandler implementation="com.jetbrains.edu.learning.StudyAnswerPlaceholderExtendWordHandler"/>
+    <extendWordSelectionHandler implementation="com.jetbrains.edu.learning.StudyAnswerPlaceholderExtendWordHandler"/>
+    <renameHandler implementation="com.jetbrains.edu.learning.StudyRenameHandler"/>
   </extensions>
 </idea-plugin>

python/educational/interactive-learning/src/com/jetbrains/edu/learning/StudyRenameHandler.java

@@ -0,0 +1,46 @@
+package com.jetbrains.edu.learning;
+
+import com.intellij.openapi.actionSystem.CommonDataKeys;
+import com.intellij.openapi.actionSystem.DataContext;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.ui.Messages;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.refactoring.rename.RenameHandler;
+import com.jetbrains.edu.courseFormat.Course;
+import org.jetbrains.annotations.NotNull;
+
+public class StudyRenameHandler implements RenameHandler {
+  @Override
+  public boolean isAvailableOnDataContext(DataContext dataContext) {
+    Project project = CommonDataKeys.PROJECT.getData(dataContext);
+    PsiElement element = CommonDataKeys.PSI_ELEMENT.getData(dataContext);
+    if (element == null || project == null) {
+      return false;
+    }
+    Course course = StudyTaskManager.getInstance(project).getCourse();
+    if (course == null) {
+      return false;
+    }
+    if (!StudyUtils.isRenameableOrMoveable(project, course, element)) {
+      return true;
+    }
+    return false;
+  }
+
+  @Override
+  public boolean isRenaming(DataContext dataContext) {
+    return isAvailableOnDataContext(dataContext);
+  }
+
+  @Override
+  public void invoke(@NotNull Project project, Editor editor, PsiFile file, DataContext dataContext) {
+    Messages.showWarningDialog("This rename operation can break the course", "Invalid Rename Operation");
+  }
+
+  @Override
+  public void invoke(@NotNull Project project, @NotNull PsiElement[] elements, DataContext dataContext) {
+    invoke(project, null, null, dataContext);
+  }
+}

python/educational/interactive-learning/src/com/jetbrains/edu/learning/StudyUtils.java

@@ -25,6 +25,9 @@ import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.vfs.VfsUtil;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.wm.ToolWindowManager;
+import com.intellij.psi.PsiDirectory;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
 import com.intellij.ui.JBColor;
 import com.intellij.ui.awt.RelativePoint;
 import com.intellij.util.ui.UIUtil;
@@ -334,4 +337,37 @@ public class StudyUtils {
     }
     return FileDocumentManager.getInstance().getDocument(patternFile);
   }
+
+  public static boolean isRenameableOrMoveable(@NotNull final Project project, @NotNull final Course course, @NotNull final PsiElement element) {
+    if (element instanceof PsiFile) {
+      VirtualFile virtualFile = ((PsiFile)element).getVirtualFile();
+      if (project.getBaseDir().equals(virtualFile.getParent())) {
+        return false;
+      }
+      TaskFile file = getTaskFile(project, virtualFile);
+      if (file != null) {
+        return false;
+      }
+      String name = virtualFile.getName();
+      return !isTestsFile(project, name) && !EduNames.TASK_HTML.equals(name);
+    }
+    if (element instanceof PsiDirectory) {
+      VirtualFile virtualFile = ((PsiDirectory)element).getVirtualFile();
+      VirtualFile parent = virtualFile.getParent();
+      if (parent == null) {
+        return true;
+      }
+      if (project.getBaseDir().equals(parent)) {
+        return false;
+      }
+      Lesson lesson = course.getLesson(parent.getName());
+      if (lesson != null) {
+        Task task = lesson.getTask(virtualFile.getName());
+        if (task != null) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
 }

python/educational/interactive-learning/src/com/jetbrains/edu/learning/actions/StudyRenameTaskFileAction.java

@@ -1,31 +0,0 @@
-package com.jetbrains.edu.learning.actions;
-
-import com.intellij.openapi.actionSystem.CommonDataKeys;
-import com.intellij.openapi.actionSystem.DataContext;
-import com.intellij.psi.PsiDirectory;
-import com.intellij.psi.PsiElement;
-import com.intellij.psi.PsiFile;
-import com.intellij.refactoring.actions.RenameElementAction;
-import com.jetbrains.edu.learning.StudyUtils;
-import org.jetbrains.annotations.NotNull;
-
-public class StudyRenameTaskFileAction extends RenameElementAction {
-  @Override
-  protected boolean isEnabledOnDataContext(DataContext dataContext) {
-    PsiElement element = CommonDataKeys.PSI_ELEMENT.getData(dataContext);
-    return super.isEnabledOnDataContext(dataContext) && !isTaskFile(element);
-  }
-
-  private static boolean isTaskFile(PsiElement element) {
-    if (element == null || element instanceof PsiDirectory) {
-      return false;
-    }
-    PsiFile file = element.getContainingFile();
-    return file != null && StudyUtils.getTaskFile(element.getProject(), file.getVirtualFile()) != null;
-  }
-
-  @Override
-  public boolean isEnabledOnElements(@NotNull PsiElement[] elements){
-    return !super.isEnabledOnElements(elements) && !isTaskFile(elements[0]);
-  }
-}