/**
   * Returns the currently selected file, based on which VcsBranch or StatusBar components will
   * identify the current repository root.
   */
  @Nullable
  public static VirtualFile getSelectedFile(@NotNull Project project) {
    StatusBar statusBar = WindowManager.getInstance().getStatusBar(project);
    final FileEditor fileEditor = StatusBarUtil.getCurrentFileEditor(project, statusBar);
    VirtualFile result = null;
    if (fileEditor != null) {
      if (fileEditor instanceof TextEditor) {
        Document document = ((TextEditor) fileEditor).getEditor().getDocument();
        result = FileDocumentManager.getInstance().getFile(document);
      } else if (fileEditor instanceof ImageFileEditor) {
        result = ((ImageFileEditor) fileEditor).getImageEditor().getFile();
      }
    }

    if (result == null) {
      final FileEditorManager manager = FileEditorManager.getInstance(project);
      if (manager != null) {
        Editor editor = manager.getSelectedTextEditor();
        if (editor != null) {
          result = FileDocumentManager.getInstance().getFile(editor.getDocument());
        }
      }
    }
    return result;
  }
  private static void highlightElement(@NotNull PsiElement element) {
    final Project project = element.getProject();
    final FileEditorManager editorManager = FileEditorManager.getInstance(project);
    final HighlightManager highlightManager = HighlightManager.getInstance(project);
    final EditorColorsManager editorColorsManager = EditorColorsManager.getInstance();
    final Editor editor = editorManager.getSelectedTextEditor();
    final EditorColorsScheme globalScheme = editorColorsManager.getGlobalScheme();
    final TextAttributes textattributes =
        globalScheme.getAttributes(EditorColors.SEARCH_RESULT_ATTRIBUTES);
    final PsiElement[] elements = new PsiElement[] {element};
    highlightManager.addOccurrenceHighlights(editor, elements, textattributes, true, null);

    StatusBar.Info.set(
        IntentionPowerPackBundle.message("status.bar.escape.highlighting.message"), project);
  }
  public static List<SearchScope> getPredefinedScopes(
      @NotNull final Project project,
      @Nullable final DataContext dataContext,
      boolean suggestSearchInLibs,
      boolean prevSearchFiles,
      boolean currentSelection,
      boolean usageView) {
    ArrayList<SearchScope> result = new ArrayList<SearchScope>();
    result.add(GlobalSearchScope.projectScope(project));
    if (suggestSearchInLibs) {
      result.add(GlobalSearchScope.allScope(project));
    }

    if (!PlatformUtils.isCidr()
        && ModuleUtil.isSupportedRootType(
            project, JavaSourceRootType.TEST_SOURCE)) { // TODO: fix these scopes in AppCode
      result.add(GlobalSearchScopes.projectProductionScope(project));
      result.add(GlobalSearchScopes.projectTestScope(project));
    }

    result.add(GlobalSearchScopes.openFilesScope(project));

    if (dataContext != null) {
      PsiElement dataContextElement = CommonDataKeys.PSI_FILE.getData(dataContext);
      if (dataContextElement == null) {
        dataContextElement = CommonDataKeys.PSI_ELEMENT.getData(dataContext);
      }
      if (dataContextElement != null) {
        if (!PlatformUtils.isCidr()) { // TODO: have an API to disable module scopes.
          Module module = ModuleUtilCore.findModuleForPsiElement(dataContextElement);
          if (module == null) {
            module = LangDataKeys.MODULE.getData(dataContext);
          }
          if (module != null) {
            result.add(module.getModuleScope());
          }
        }
        if (dataContextElement.getContainingFile() != null) {
          result.add(
              new LocalSearchScope(dataContextElement, IdeBundle.message("scope.current.file")));
        }
      }
    }

    if (currentSelection) {
      FileEditorManager fileEditorManager = FileEditorManager.getInstance(project);
      final Editor selectedTextEditor = fileEditorManager.getSelectedTextEditor();
      if (selectedTextEditor != null) {
        final PsiFile psiFile =
            PsiDocumentManager.getInstance(project).getPsiFile(selectedTextEditor.getDocument());
        if (psiFile != null) {
          if (selectedTextEditor.getSelectionModel().hasSelection()) {
            final PsiElement startElement =
                psiFile.findElementAt(selectedTextEditor.getSelectionModel().getSelectionStart());
            if (startElement != null) {
              final PsiElement endElement =
                  psiFile.findElementAt(selectedTextEditor.getSelectionModel().getSelectionEnd());
              if (endElement != null) {
                final PsiElement parent = PsiTreeUtil.findCommonParent(startElement, endElement);
                if (parent != null) {
                  final List<PsiElement> elements = new ArrayList<PsiElement>();
                  final PsiElement[] children = parent.getChildren();
                  for (PsiElement child : children) {
                    if (!(child instanceof PsiWhiteSpace) && child.getContainingFile() != null) {
                      elements.add(child);
                    }
                  }
                  if (!elements.isEmpty()) {
                    SearchScope local =
                        new LocalSearchScope(
                            PsiUtilCore.toPsiElementArray(elements),
                            IdeBundle.message("scope.selection"));
                    result.add(local);
                  }
                }
              }
            }
          }
        }
      }
    }

    if (usageView) {
      UsageView selectedUsageView = UsageViewManager.getInstance(project).getSelectedUsageView();
      if (selectedUsageView != null && !selectedUsageView.isSearchInProgress()) {
        final Set<Usage> usages = selectedUsageView.getUsages();
        final List<PsiElement> results = new ArrayList<PsiElement>(usages.size());

        if (prevSearchFiles) {
          final Set<VirtualFile> files = new HashSet<VirtualFile>();
          for (Usage usage : usages) {
            if (usage instanceof PsiElementUsage) {
              PsiElement psiElement = ((PsiElementUsage) usage).getElement();
              if (psiElement != null && psiElement.isValid()) {
                PsiFile psiFile = psiElement.getContainingFile();
                if (psiFile != null) {
                  VirtualFile file = psiFile.getVirtualFile();
                  if (file != null) files.add(file);
                }
              }
            }
          }
          if (!files.isEmpty()) {
            GlobalSearchScope prev =
                new GlobalSearchScope(project) {
                  @Override
                  public String getDisplayName() {
                    return IdeBundle.message("scope.files.in.previous.search.result");
                  }

                  @Override
                  public boolean contains(@NotNull VirtualFile file) {
                    return files.contains(file);
                  }

                  @Override
                  public int compare(@NotNull VirtualFile file1, @NotNull VirtualFile file2) {
                    return 0;
                  }

                  @Override
                  public boolean isSearchInModuleContent(@NotNull Module aModule) {
                    return true;
                  }

                  @Override
                  public boolean isSearchInLibraries() {
                    return true;
                  }
                };
            result.add(prev);
          }
        } else {
          for (Usage usage : usages) {
            if (usage instanceof PsiElementUsage) {
              final PsiElement element = ((PsiElementUsage) usage).getElement();
              if (element != null && element.isValid() && element.getContainingFile() != null) {
                results.add(element);
              }
            }
          }

          if (!results.isEmpty()) {
            result.add(
                new LocalSearchScope(
                    PsiUtilCore.toPsiElementArray(results),
                    IdeBundle.message("scope.previous.search.results")));
          }
        }
      }
    }

    final FavoritesManager favoritesManager = FavoritesManager.getInstance(project);
    if (favoritesManager != null) {
      for (final String favorite : favoritesManager.getAvailableFavoritesListNames()) {
        final Collection<TreeItem<Pair<AbstractUrl, String>>> rootUrls =
            favoritesManager.getFavoritesListRootUrls(favorite);
        if (rootUrls.isEmpty()) continue; // ignore unused root
        result.add(
            new GlobalSearchScope(project) {
              @Override
              public String getDisplayName() {
                return "Favorite \'" + favorite + "\'";
              }

              @Override
              public boolean contains(@NotNull final VirtualFile file) {
                return favoritesManager.contains(favorite, file);
              }

              @Override
              public int compare(
                  @NotNull final VirtualFile file1, @NotNull final VirtualFile file2) {
                return 0;
              }

              @Override
              public boolean isSearchInModuleContent(@NotNull final Module aModule) {
                return true;
              }

              @Override
              public boolean isSearchInLibraries() {
                return true;
              }
            });
      }
    }

    if (dataContext != null) {
      final VirtualFile[] files = CommonDataKeys.VIRTUAL_FILE_ARRAY.getData(dataContext);
      if (files != null) {
        final List<VirtualFile> openFiles = Arrays.asList(files);
        result.add(
            new DelegatingGlobalSearchScope(GlobalSearchScope.filesScope(project, openFiles)) {
              @Override
              public String getDisplayName() {
                return "Selected Files";
              }
            });
      }
    }

    return result;
  }