/**
 * Activate the terminal plugin.
 */
function activate(app: JupyterLab, mainMenu: IMainMenu, palette: ICommandPalette, restorer: ILayoutRestorer, launcher: ILauncher | null): ITerminalTracker {
  const { commands, serviceManager } = app;
  const category = 'Terminal';
  const namespace = 'terminal';
  const tracker = new InstanceTracker<MainAreaWidget<Terminal>>({ namespace });

  // Bail if there are no terminals available.
  if (!serviceManager.terminals.isAvailable()) {
    console.log('Disabling terminals plugin because they are not available on the server');
    return tracker;
  }

  // Handle state restoration.
  restorer.restore(tracker, {
    command: CommandIDs.createNew,
    args: widget => ({ name: widget.content.session.name }),
    name: widget => widget.content.session && widget.content.session.name
  });

  addCommands(app, serviceManager, tracker);

  // Add some commands to the application view menu.
  const viewGroup = [
    CommandIDs.increaseFont,
    CommandIDs.decreaseFont,
    CommandIDs.toggleTheme
  ].map(command => { return { command }; });
  mainMenu.viewMenu.addGroup(viewGroup, 30);

  // Add command palette items.
  [
    CommandIDs.createNew,
    CommandIDs.refresh,
    CommandIDs.increaseFont,
    CommandIDs.decreaseFont,
    CommandIDs.toggleTheme
  ].forEach(command => {
    palette.addItem({ command, category, args: { 'isPalette': true } });
  });

  // Add terminal creation to the file menu.
  mainMenu.fileMenu.newMenu.addGroup([{ command: CommandIDs.createNew }], 20);

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      displayName: 'Terminal',
      category: 'Other',
      rank: 0,
      iconClass: TERMINAL_ICON_CLASS,
      callback: () => commands.execute(CommandIDs.createNew)
    });
  }

  app.contextMenu.addItem({command: CommandIDs.refresh, selector: '.jp-Terminal', rank: 1});

  return tracker;
}

/**
 * Activate the editor tracker plugin.
 */
function activate(app: JupyterLab, registry: IDocumentRegistry, restorer: ILayoutRestorer, editorServices: IEditorServices, launcher: ILauncher | null): IEditorTracker {
  const factory = new EditorWidgetFactory({
    editorServices,
    factoryOptions: {
      name: FACTORY,
      fileExtensions: ['*'],
      defaultFor: ['*']
    }
  });
  const shell = app.shell;
  const tracker = new InstanceTracker<EditorWidget>({
    namespace: 'editor',
    shell
  });

  // Handle state restoration.
  restorer.restore(tracker, {
    command: 'file-operations:open',
    args: widget => ({ path: widget.context.path, factory: FACTORY }),
    name: widget => widget.context.path
  });

  factory.widgetCreated.connect((sender, widget) => {
    widget.title.icon = EDITOR_ICON_CLASS;
    // Notify the instance tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => { tracker.save(widget); });
    tracker.add(widget);
  });
  registry.addWidgetFactory(factory);

  addDefaultCommands(tracker, app.commands);

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      name: 'Text Editor',
      command: 'filebrowser:new-text-file'
    });
  }

  return tracker;
}

/**
 * Activate the editor tracker plugin.
 */
function activate(
  app: JupyterLab,
  consoleTracker: IConsoleTracker,
  editorServices: IEditorServices,
  browserFactory: IFileBrowserFactory,
  restorer: ILayoutRestorer,
  settingRegistry: ISettingRegistry,
  palette: ICommandPalette,
  launcher: ILauncher | null,
  menu: IMainMenu | null
): IEditorTracker {
  const id = plugin.id;
  const namespace = 'editor';
  const factory = new FileEditorFactory({
    editorServices,
    factoryOptions: {
      name: FACTORY,
      fileTypes: ['markdown', '*'], // Explicitly add the markdown fileType so
      defaultFor: ['markdown', '*'] // it outranks the defaultRendered viewer.
    }
  });
  const { commands, restored } = app;
  const tracker = new InstanceTracker<IDocumentWidget<FileEditor>>({
    namespace
  });
  const isEnabled = () =>
    tracker.currentWidget !== null &&
    tracker.currentWidget === app.shell.currentWidget;

  let config = { ...CodeEditor.defaultConfig };

  // Handle state restoration.
  restorer.restore(tracker, {
    command: 'docmanager:open',
    args: widget => ({ path: widget.context.path, factory: FACTORY }),
    name: widget => widget.context.path
  });

  /**
   * Update the setting values.
   */
  function updateSettings(settings: ISettingRegistry.ISettings): void {
    let cached = settings.get('editorConfig').composite as Partial<
      CodeEditor.IConfig
    >;
    Object.keys(config).forEach((key: keyof CodeEditor.IConfig) => {
      config[key] =
        cached[key] === null || cached[key] === undefined
          ? CodeEditor.defaultConfig[key]
          : cached[key];
    });
    // Trigger a refresh of the rendered commands
    app.commands.notifyCommandChanged();
  }

  /**
   * Update the settings of the current tracker instances.
   */
  function updateTracker(): void {
    tracker.forEach(widget => {
      updateWidget(widget.content);
    });
  }

  /**
   * Update the settings of a widget.
   */
  function updateWidget(widget: FileEditor): void {
    const editor = widget.editor;
    Object.keys(config).forEach((key: keyof CodeEditor.IConfig) => {
      editor.setOption(key, config[key]);
    });
  }

  // Add a console creator to the File menu
  // Fetch the initial state of the settings.
  Promise.all([settingRegistry.load(id), restored])
    .then(([settings]) => {
      updateSettings(settings);
      updateTracker();
      settings.changed.connect(() => {
        updateSettings(settings);
        updateTracker();
      });
    })
    .catch((reason: Error) => {
      console.error(reason.message);
      updateTracker();
    });

  factory.widgetCreated.connect((sender, widget) => {
    widget.title.icon = EDITOR_ICON_CLASS;

    // Notify the instance tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => {
      tracker.save(widget);
    });
//.........这里部分代码省略.........

/**
 * Activate the terminal plugin.
 */
function activate(
  app: JupyterFrontEnd,
  settingRegistry: ISettingRegistry,
  palette: ICommandPalette | null,
  launcher: ILauncher | null,
  restorer: ILayoutRestorer | null,
  mainMenu: IMainMenu | null
): ITerminalTracker {
  const { serviceManager } = app;
  const category = 'Terminal';
  const namespace = 'terminal';
  const tracker = new InstanceTracker<MainAreaWidget<Terminal>>({ namespace });

  // Bail if there are no terminals available.
  if (!serviceManager.terminals.isAvailable()) {
    console.log(
      'Disabling terminals plugin because they are not available on the server'
    );
    return tracker;
  }

  // Handle state restoration.
  if (restorer) {
    restorer.restore(tracker, {
      command: CommandIDs.createNew,
      args: widget => ({ name: widget.content.session.name }),
      name: widget => widget.content.session && widget.content.session.name
    });
  }

  // The terminal options from the setting editor.
  let options: Partial<Terminal.IOptions>;

  /**
   * Update the option values.
   */
  function updateOptions(settings: ISettingRegistry.ISettings): void {
    options = settings.composite as Partial<Terminal.IOptions>;
    Object.keys(options).forEach((key: keyof Terminal.IOptions) => {
      Terminal.defaultOptions[key] = options[key];
    });
  }

  /**
   * Update terminal
   */
  function updateTerminal(widget: MainAreaWidget<Terminal>): void {
    const terminal = widget.content;
    if (!terminal) {
      return;
    }
    Object.keys(options).forEach((key: keyof Terminal.IOptions) => {
      terminal.setOption(key, options[key]);
    });
  }

  /**
   * Update the settings of the current tracker instances.
   */
  function updateTracker(): void {
    tracker.forEach(widget => updateTerminal(widget));
  }

  // Fetch the initial state of the settings.
  settingRegistry
    .load(plugin.id)
    .then(settings => {
      updateOptions(settings);
      updateTracker();
      settings.changed.connect(() => {
        updateOptions(settings);
        updateTracker();
      });
    })
    .catch((reason: Error) => {
      console.error(reason.message);
    });

  addCommands(app, tracker, settingRegistry);

  if (mainMenu) {
    // Add some commands to the application view menu.
    const viewGroup = [
      CommandIDs.increaseFont,
      CommandIDs.decreaseFont,
      CommandIDs.toggleTheme
    ].map(command => {
      return { command };
    });
    mainMenu.settingsMenu.addGroup(viewGroup, 40);

    // Add terminal creation to the file menu.
    mainMenu.fileMenu.newMenu.addGroup([{ command: CommandIDs.createNew }], 20);
  }

  if (palette) {
    // Add command palette items.
//.........这里部分代码省略.........

/**
 * Activate the console extension.
 */
function activateConsole(app: JupyterLab, manager: IServiceManager, rendermime: IRenderMime, mainMenu: IMainMenu, palette: ICommandPalette, contentFactory: ConsolePanel.IContentFactory,  editorServices: IEditorServices, restorer: ILayoutRestorer, launcher: ILauncher | null): IConsoleTracker {
  let { commands, shell } = app;
  let category = 'Console';
  let command: string;
  let menu = new Menu({ commands });

  // Create an instance tracker for all console panels.
  const tracker = new InstanceTracker<ConsolePanel>({
    namespace: 'console',
    shell
  });

  // Handle state restoration.
  restorer.restore(tracker, {
    command: CommandIDs.open,
    args: panel => ({
      path: panel.console.session.path,
      name: panel.console.session.name
    }),
    name: panel => panel.console.session.path,
    when: manager.ready
  });

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      name: 'Code Console',
      command: CommandIDs.create
    });
  }

  // Set the main menu title.
  menu.title.label = category;

  /**
   * Create a console for a given path.
   */
  function createConsole(options: Partial<ConsolePanel.IOptions>): Promise<void> {
    return manager.ready.then(() => {
      let panel = new ConsolePanel({
        manager,
        rendermime: rendermime.clone(),
        contentFactory,
        mimeTypeService: editorServices.mimeTypeService,
        ...options
      });

      // Add the console panel to the tracker.
      tracker.add(panel);
      shell.addToMainArea(panel);
      tracker.activate(panel);
    });
  }

  command = CommandIDs.open;
  commands.addCommand(command, {
    execute: (args: Partial<ConsolePanel.IOptions>) => {
      let path = args['path'];
      let widget = tracker.find(value => {
        if (value.console.session.path === path) {
          return true;
        }
      });
      if (widget) {
        tracker.activate(widget);
      } else {
        return manager.ready.then(() => {
          let model = find(manager.sessions.running(), item => {
            return item.path === path;
          });
          if (model) {
            return createConsole(args);
          }
        });
      }
    }
  });

  command = CommandIDs.create;
  commands.addCommand(command, {
    label: 'Start New Console',
    execute: (args: Partial<ConsolePanel.IOptions>) => {
      let basePath = args.basePath || '.';
      return createConsole({ basePath, ...args });
    }
  });
  palette.addItem({ command, category });

  // Get the current widget and activate unless the args specify otherwise.
  function getCurrent(args: JSONObject): ConsolePanel | null {
    let widget = tracker.currentWidget;
    let activate = args['activate'] !== false;
    if (activate && widget) {
      tracker.activate(widget);
    }
    return widget;
  }
//.........这里部分代码省略.........

/**
 * Activate the terminal plugin.
 */
function activate(
  app: JupyterFrontEnd,
  settingRegistry: ISettingRegistry,
  palette: ICommandPalette | null,
  launcher: ILauncher | null,
  restorer: ILayoutRestorer | null,
  mainMenu: IMainMenu | null,
  themeManager: IThemeManager
): ITerminalTracker {
  const { serviceManager, commands } = app;
  const category = 'Terminal';
  const namespace = 'terminal';
  const tracker = new InstanceTracker<MainAreaWidget<ITerminal.ITerminal>>({
    namespace
  });

  // Bail if there are no terminals available.
  if (!serviceManager.terminals.isAvailable()) {
    console.log(
      'Disabling terminals plugin because they are not available on the server'
    );
    return tracker;
  }

  // Handle state restoration.
  if (restorer) {
    restorer.restore(tracker, {
      command: CommandIDs.createNew,
      args: widget => ({ name: widget.content.session.name }),
      name: widget => widget.content.session && widget.content.session.name
    });
  }

  // The terminal options from the setting editor.
  let options: Partial<ITerminal.IOptions>;

  /**
   * Update the option values.
   */
  function updateOptions(settings: ISettingRegistry.ISettings): void {
    options = settings.composite as Partial<ITerminal.IOptions>;
    Object.keys(options).forEach((key: keyof ITerminal.IOptions) => {
      ITerminal.defaultOptions[key] = options[key];
    });
  }

  /**
   * Update terminal
   */
  function updateTerminal(widget: MainAreaWidget<ITerminal.ITerminal>): void {
    const terminal = widget.content;
    if (!terminal) {
      return;
    }
    Object.keys(options).forEach((key: keyof ITerminal.IOptions) => {
      terminal.setOption(key, options[key]);
    });
  }

  /**
   * Update the settings of the current tracker instances.
   */
  function updateTracker(): void {
    tracker.forEach(widget => updateTerminal(widget));
  }

  // Fetch the initial state of the settings.
  settingRegistry
    .load(plugin.id)
    .then(settings => {
      updateOptions(settings);
      updateTracker();
      settings.changed.connect(() => {
        updateOptions(settings);
        updateTracker();
      });
    })
    .catch(Private.showErrorMessage);

  // Subscribe to changes in theme.
  themeManager.themeChanged.connect((sender, args) => {
    tracker.forEach(widget => {
      const terminal = widget.content;
      if (terminal.getOption('theme') === 'inherit') {
        terminal.setOption('theme', 'inherit');
      }
    });
  });

  addCommands(app, tracker, settingRegistry);

  if (mainMenu) {
    // Add "Terminal Theme" menu below "JupyterLab Themes" menu.
    const themeMenu = new Menu({ commands });
    themeMenu.title.label = 'Terminal Theme';
    themeMenu.addItem({
      command: CommandIDs.setTheme,
//.........这里部分代码省略.........

/**
 * Activate the editor tracker plugin.
 */
function activate(app: JupyterLab, restorer: ILayoutRestorer, editorServices: IEditorServices, settingRegistry: ISettingRegistry, launcher: ILauncher | null): IEditorTracker {
  const id = plugin.id;
  const namespace = 'editor';
  const factory = new FileEditorFactory({
    editorServices,
    factoryOptions: { name: FACTORY, fileTypes: ['*'], defaultFor: ['*'] }
  });
  const { commands, restored } = app;
  const tracker = new InstanceTracker<FileEditor>({ namespace });
  const hasWidget = () => !!tracker.currentWidget;

  let {
    lineNumbers, lineWrap, matchBrackets, autoClosingBrackets
  } = CodeEditor.defaultConfig;

  // Handle state restoration.
  restorer.restore(tracker, {
    command: 'docmanager:open',
    args: widget => ({ path: widget.context.path, factory: FACTORY }),
    name: widget => widget.context.path
  });

  /**
   * Update the setting values.
   */
  function updateSettings(settings: ISettingRegistry.ISettings): void {
    let cached = settings.get('lineNumbers').composite as boolean | null;
    lineNumbers = cached === null ? lineNumbers : !!cached;
    cached = settings.get('matchBrackets').composite as boolean | null;
    matchBrackets = cached === null ? matchBrackets : !!cached;
    cached = settings.get('autoClosingBrackets').composite as boolean | null;
    autoClosingBrackets = cached === null ? autoClosingBrackets : !!cached;
    cached = settings.get('lineWrap').composite as boolean | null;
    lineWrap = cached === null ? lineWrap : !!cached;
  }

  /**
   * Update the settings of the current tracker instances.
   */
  function updateTracker(): void {
    tracker.forEach(widget => { updateWidget(widget); });
  }

  /**
   * Update the settings of a widget.
   */
  function updateWidget(widget: FileEditor): void {
    const editor = widget.editor;
    editor.setOption('lineNumbers', lineNumbers);
    editor.setOption('lineWrap', lineWrap);
    editor.setOption('matchBrackets', matchBrackets);
    editor.setOption('autoClosingBrackets', autoClosingBrackets);
  }

  // Fetch the initial state of the settings.
  Promise.all([settingRegistry.load(id), restored]).then(([settings]) => {
    updateSettings(settings);
    updateTracker();
    settings.changed.connect(() => {
      updateSettings(settings);
      updateTracker();
    });
  }).catch((reason: Error) => {
    console.error(reason.message);
    updateTracker();
  });

  factory.widgetCreated.connect((sender, widget) => {
    widget.title.icon = EDITOR_ICON_CLASS;

    // Notify the instance tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => { tracker.save(widget); });
    tracker.add(widget);
    updateWidget(widget);
  });
  app.docRegistry.addWidgetFactory(factory);

  // Handle the settings of new widgets.
  tracker.widgetAdded.connect((sender, widget) => {
    updateWidget(widget);
  });

  commands.addCommand(CommandIDs.lineNumbers, {
    execute: () => {
      const key = 'lineNumbers';
      const value = lineNumbers = !lineNumbers;

      updateTracker();
      return settingRegistry.set(id, key, value).catch((reason: Error) => {
        console.error(`Failed to set ${id}:${key} - ${reason.message}`);
      });
    },
    isEnabled: hasWidget,
    isToggled: () => lineNumbers,
    label: 'Line Numbers'
  });

//.........这里部分代码省略.........

  activate: (
    app: JupyterFrontEnd,
    palette: ICommandPalette | null,
    launcher: ILauncher | null,
    restorer: ILayoutRestorer | null
  ): IInspector => {
    const { commands, shell } = app;
    const command = CommandIDs.open;
    const label = 'Open Inspector';
    const title = 'Inspector';
    const namespace = 'inspector';
    const tracker = new InstanceTracker<MainAreaWidget<InspectorPanel>>({
      namespace
    });

    let source: IInspector.IInspectable | null = null;
    let inspector: MainAreaWidget<InspectorPanel>;
    function openInspector(): MainAreaWidget<InspectorPanel> {
      if (!inspector || inspector.isDisposed) {
        inspector = new MainAreaWidget({ content: new InspectorPanel() });
        inspector.id = 'jp-inspector';
        inspector.title.label = title;
        tracker.add(inspector);
        source = source && !source.isDisposed ? source : null;
        inspector.content.source = source;
      }
      if (!inspector.isAttached) {
        shell.add(inspector, 'main', { activate: false });
      }
      shell.activateById(inspector.id);
      return inspector;
    }

    // Add command to registry.
    commands.addCommand(command, {
      caption: 'Live updating code documentation from the active kernel',
      isEnabled: () =>
        !inspector ||
        inspector.isDisposed ||
        !inspector.isAttached ||
        !inspector.isVisible,
      label: args => (args.isLauncher ? title : label),
      iconClass: args =>
        args.isLauncher ? 'jp-MaterialIcon jp-InspectorIcon' : '',
      execute: () => openInspector()
    });

    // Add command to UI where possible.
    if (palette) {
      palette.addItem({ command, category: title });
    }
    if (launcher) {
      launcher.add({ command, args: { isLauncher: true } });
    }

    // Handle state restoration.
    if (restorer) {
      restorer.restore(tracker, {
        command,
        args: () => null,
        name: () => 'inspector'
      });
    }

    // Create a proxy to pass the `source` to the current inspector.
    const proxy: IInspector = Object.defineProperty({}, 'source', {
      get: (): IInspector.IInspectable | null =>
        !inspector || inspector.isDisposed ? null : inspector.content.source,
      set: (src: IInspector.IInspectable | null) => {
        source = src && !src.isDisposed ? src : null;
        if (inspector && !inspector.isDisposed) {
          inspector.content.source = source;
        }
      }
    });

    return proxy;
  }

/**
 * Activate the terminal plugin.
 */
function activate(app: JupyterLab, services: IServiceManager, mainMenu: IMainMenu, palette: ICommandPalette, restorer: ILayoutRestorer, launcher: ILauncher | null): ITerminalTracker {
  // Bail if there are no terminals available.
  if (!services.terminals.isAvailable()) {
    console.log('Disabling terminals plugin because they are not available on the server');
    return;
  }

  const { commands, shell } = app;
  const category = 'Terminal';
  const namespace = 'terminal';
  const tracker = new InstanceTracker<TerminalWidget>({ namespace, shell });

  // Handle state restoration.
  restorer.restore(tracker, {
    command: CommandIDs.createNew,
    args: widget => ({ name: widget.session.name }),
    name: widget => widget.session && widget.session.name
  });

  addDefaultCommands(tracker, commands);

  // Add terminal commands.
  commands.addCommand(CommandIDs.createNew, {
    label: 'New Terminal',
    caption: 'Start a new terminal session',
    execute: args => {
      let name = args ? args['name'] as string : '';
      let term = new TerminalWidget();
      term.title.closable = true;
      term.title.icon = TERMINAL_ICON_CLASS;
      term.title.label = '...';
      shell.addToMainArea(term);

      let promise = name ?
        services.terminals.connectTo(name)
        : services.terminals.startNew();

      return promise.then(session => {
        term.session = session;
        tracker.add(term);
        tracker.activate(term);
      }).catch(() => { term.dispose(); });
    }
  });

  commands.addCommand(CommandIDs.open, {
    execute: args => {
      let name = args['name'] as string;
      // Check for a running terminal with the given name.
      let widget = tracker.find(value => value.session.name === name);
      if (widget) {
        tracker.activate(widget);
      } else {
        // Otherwise, create a new terminal with a given name.
        return commands.execute(CommandIDs.createNew, { name });
      }
    }
  });

  commands.addCommand(CommandIDs.refresh, {
    label: 'Refresh Terminal',
    caption: 'Refresh the current terminal session',
    execute: () => {
      let current = tracker.currentWidget;
      if (!current) {
        return;
      }
      tracker.activate(current);
      return current.refresh().then(() => {
        current.activate();
      });
    },
    isEnabled: () => { return tracker.currentWidget !== null; }
  });

  // Add command palette and menu items.
  let menu = new Menu({ commands });
  menu.title.label = category;
  [
    CommandIDs.createNew,
    CommandIDs.refresh,
    CommandIDs.increaseFont,
    CommandIDs.decreaseFont,
    CommandIDs.toggleTheme
  ].forEach(command => {
    palette.addItem({ command, category });
    menu.addItem({ command });
  });
  mainMenu.addMenu(menu, {rank: 40});

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      name: 'Terminal',
      command: CommandIDs.createNew
    });
  }
//.........这里部分代码省略.........

/**
 * Activate the notebook handler extension.
 */
function activateNotebookHandler(app: JupyterLab, registry: IDocumentRegistry, services: IServiceManager, rendermime: IRenderMime, mainMenu: IMainMenu, palette: ICommandPalette, contentFactory: NotebookPanel.IContentFactory, editorServices: IEditorServices, restorer: ILayoutRestorer, launcher: ILauncher | null): INotebookTracker {

  const factory = new NotebookWidgetFactory({
    name: FACTORY,
    fileExtensions: ['.ipynb'],
    modelName: 'notebook',
    defaultFor: ['.ipynb'],
    preferKernel: true,
    canStartKernel: true,
    rendermime,
    contentFactory,
    mimeTypeService: editorServices.mimeTypeService
  });

  const shell = app.shell;
  const tracker = new NotebookTracker({ namespace: 'notebook', shell });

  // Handle state restoration.
  restorer.restore(tracker, {
    command: 'file-operations:open',
    args: panel => ({ path: panel.context.path, factory: FACTORY }),
    name: panel => panel.context.path,
    when: services.ready
  });

  registry.addModelFactory(new NotebookModelFactory({}));
  registry.addWidgetFactory(factory);
  registry.addFileType({
    name: 'Notebook',
    extension: '.ipynb',
    contentType: 'notebook',
    fileFormat: 'json'
  });
  registry.addCreator({
    name: 'Notebook',
    fileType: 'Notebook',
    widgetName: 'Notebook'
  });

  addCommands(app, services, tracker);
  populatePalette(palette);

  let id = 0; // The ID counter for notebook panels.

  factory.widgetCreated.connect((sender, widget) => {
    // If the notebook panel does not have an ID, assign it one.
    widget.id = widget.id || `notebook-${++id}`;
    widget.title.icon = NOTEBOOK_ICON_CLASS;
    // Notify the instance tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => { tracker.save(widget); });
    // Add the notebook panel to the tracker.
    tracker.add(widget);
  });

  // Add main menu notebook menu.
  mainMenu.addMenu(createMenu(app), { rank: 20 });

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      args: { creatorName: 'Notebook' },
      command: 'file-operations:create-from',
      name: 'Notebook'
    });
  }

  app.contextMenu.addItem({command: CommandIDs.clearOutputs, selector: '.jp-Notebook .jp-Cell'});
  app.contextMenu.addItem({command: CommandIDs.split, selector: '.jp-Notebook .jp-Cell'});
  app.contextMenu.addItem({ type: 'separator', selector: '.jp-Notebook', rank: 0 });
  app.contextMenu.addItem({command: CommandIDs.undo, selector: '.jp-Notebook', rank: 1});
  app.contextMenu.addItem({command: CommandIDs.redo, selector: '.jp-Notebook', rank: 2});
  app.contextMenu.addItem({ type: 'separator', selector: '.jp-Notebook', rank: 0 });
  app.contextMenu.addItem({command: CommandIDs.createConsole, selector: '.jp-Notebook', rank: 3});

  return tracker;
}

/**
 * Activate the editor tracker plugin.
 */
function activate(app: JupyterLab, registry: IDocumentRegistry, restorer: ILayoutRestorer, editorServices: IEditorServices, state: IStateDB, launcher: ILauncher | null): IEditorTracker {
  const factory = new FileEditorFactory({
    editorServices,
    factoryOptions: {
      name: FACTORY,
      fileExtensions: ['*'],
      defaultFor: ['*']
    }
  });
  const { commands, shell } = app;
  const id = 'editor:settings';
  const tracker = new InstanceTracker<FileEditor>({
    namespace: 'editor',
    shell
  });

  let lineNumbers = true;
  let wordWrap = true;

  // Handle state restoration.
  restorer.restore(tracker, {
    command: 'file-operations:open',
    args: widget => ({ path: widget.context.path, factory: FACTORY }),
    name: widget => widget.context.path
  });

  // Fetch the initial state of the settings.
  state.fetch(id).then(settings => {
    if (!settings) {
      return;
    }
    if (typeof settings['wordWrap'] === 'string') {
      commands.execute(CommandIDs.wordWrap, settings);
    }
    if (typeof settings['lineNumbers'] === 'string') {
      commands.execute(CommandIDs.lineNumbers, settings);
    }
  });

  /**
   * Save the editor widget settings state.
   */
  function saveState(): Promise<void> {
    return state.save(id, { lineNumbers, wordWrap });
  }

  factory.widgetCreated.connect((sender, widget) => {
    widget.title.icon = EDITOR_ICON_CLASS;
    // Notify the instance tracker if restore data needs to update.
    widget.context.pathChanged.connect(() => { tracker.save(widget); });
    tracker.add(widget);
    widget.editor.lineNumbers = lineNumbers;
    widget.editor.wordWrap = wordWrap;
  });
  registry.addWidgetFactory(factory);

  /**
   * Handle the settings of new widgets.
   */
  tracker.widgetAdded.connect((sender, widget) => {
    let editor = widget.editor;
    editor.lineNumbers = lineNumbers;
    editor.wordWrap = wordWrap;
  });

  /**
   * Toggle editor line numbers
   */
  function toggleLineNums(args: JSONObject): Promise<void> {
    lineNumbers = !lineNumbers;
    tracker.forEach(widget => {
      widget.editor.lineNumbers = lineNumbers;
    });
    return saveState();
  }

  /**
   * Toggle editor line wrap
   */
  function toggleLineWrap(args: JSONObject): Promise<void> {
    wordWrap = !wordWrap;
    tracker.forEach(widget => {
      widget.editor.wordWrap = wordWrap;
    });
    return saveState();
  }

  /**
   * A test for whether the tracker has an active widget.
   */
  function hasWidget(): boolean {
    return tracker.currentWidget !== null;
  }

  commands.addCommand(CommandIDs.lineNumbers, {
    execute: toggleLineNums,
    isEnabled: hasWidget,
//.........这里部分代码省略.........

/**
 * Activate the terminal plugin.
 */
function activate(app: JupyterLab, mainMenu: IMainMenu, palette: ICommandPalette, restorer: ILayoutRestorer, launcher: ILauncher | null): ITerminalTracker {
  const { commands, serviceManager } = app;
  const category = 'Terminal';
  const namespace = 'terminal';
  const tracker = new InstanceTracker<Terminal>({ namespace });

  // Bail if there are no terminals available.
  if (!serviceManager.terminals.isAvailable()) {
    console.log('Disabling terminals plugin because they are not available on the server');
    return tracker;
  }

  // Handle state restoration.
  restorer.restore(tracker, {
    command: CommandIDs.createNew,
    args: widget => ({ name: widget.session.name }),
    name: widget => widget.session && widget.session.name
  });

  // Update the command registry when the terminal state changes.
  tracker.currentChanged.connect(() => {
    if (tracker.size <= 1) {
      commands.notifyCommandChanged(CommandIDs.refresh);
    }
  });

  addCommands(app, serviceManager, tracker);

  // Add command palette and menu items.
  let menu = new Menu({ commands });
  menu.title.label = category;
  [
    CommandIDs.createNew,
    CommandIDs.refresh,
    CommandIDs.increaseFont,
    CommandIDs.decreaseFont,
    CommandIDs.toggleTheme
  ].forEach(command => {
    palette.addItem({ command, category });
    if (command !== CommandIDs.createNew) {
      menu.addItem({ command });
    }
  });
  mainMenu.addMenu(menu, {rank: 40});

  // Add a launcher item if the launcher is available.
  if (launcher) {
    launcher.add({
      displayName: 'Terminal',
      category: 'Other',
      rank: 0,
      iconClass: TERMINAL_ICON_CLASS,
      callback: () => {
        return commands.execute(CommandIDs.createNew);
      }
    });
  }

  app.contextMenu.addItem({command: CommandIDs.refresh, selector: '.jp-Terminal', rank: 1});

  return tracker;
}

 const onSpecsChanged = () => {
   if (disposables) {
     disposables.dispose();
     disposables = null;
   }
   const specs = manager.specs;
   if (!specs) {
     return;
   }
   disposables = new DisposableSet();
   let baseUrl = PageConfig.getBaseUrl();
   for (let name in specs.kernelspecs) {
     let rank = name === specs.default ? 0 : Infinity;
     let kernelIconUrl = specs.kernelspecs[name].resources['logo-64x64'];
     if (kernelIconUrl) {
       let index = kernelIconUrl.indexOf('kernelspecs');
       kernelIconUrl = baseUrl + kernelIconUrl.slice(index);
     }
     disposables.add(
       launcher.add({
         command: CommandIDs.create,
         args: { isLauncher: true, kernelPreference: { name } },
         category: 'Console',
         rank,
         kernelIconUrl
       })
     );
   }
 };

 manager.ready.then(() => {
   const specs = manager.specs;
   if (!specs) {
     return;
   }
   let baseUrl = PageConfig.getBaseUrl();
   for (let name in specs.kernelspecs) {
     let displayName = specs.kernelspecs[name].display_name;
     let rank = name === specs.default ? 0 : Infinity;
     let kernelIconUrl = specs.kernelspecs[name].resources['logo-64x64'];
     if (kernelIconUrl) {
       let index = kernelIconUrl.indexOf('kernelspecs');
       kernelIconUrl = baseUrl + kernelIconUrl.slice(index);
     }
     launcher.add({
       displayName,
       category: 'Console',
       name,
       iconClass: 'jp-CodeConsoleIcon',
       callback,
       rank,
       kernelIconUrl
     });
   }
 });

    services.ready.then(() => {
      const specs = services.specs;
      const baseUrl = PageConfig.getBaseUrl();

      for (let name in specs.kernelspecs) {
        let rank = name === specs.default ? 0 : Infinity;
        let kernelIconUrl = specs.kernelspecs[name].resources['logo-64x64'];
        if (kernelIconUrl) {
          let index = kernelIconUrl.indexOf('kernelspecs');
          kernelIconUrl = baseUrl + kernelIconUrl.slice(index);
        }
        launcher.add({
          command: CommandIDs.createNew,
          args: { isLauncher: true, kernelName: name },
          category: 'Notebook',
          rank,
          kernelIconUrl
        });
      }
    });

 manager.ready.then(() => {
   const specs = manager.specs;
   if (!specs) {
     return;
   }
   let baseUrl = PageConfig.getBaseUrl();
   for (let name in specs.kernelspecs) {
     let rank = name === specs.default ? 0 : Infinity;
     let kernelIconUrl = specs.kernelspecs[name].resources['logo-64x64'];
     if (kernelIconUrl) {
       let index = kernelIconUrl.indexOf('kernelspecs');
       kernelIconUrl = baseUrl + kernelIconUrl.slice(index);
     }
     launcher.add({
       command: CommandIDs.create,
       args: { isLauncher: true, kernelPreference: { name } },
       category: 'Console',
       rank,
       kernelIconUrl
     });
   }
 });

 services.ready.then(() => {
   let specs = services.specs;
   let baseUrl = PageConfig.getBaseUrl();
   for (let name in specs.kernelspecs) {
     let displayName = specs.kernelspecs[name].display_name;
     let rank = name === specs.default ? 0 : Infinity;
     let kernelIconUrl = specs.kernelspecs[name].resources['logo-64x64'];
     if (kernelIconUrl) {
       let index = kernelIconUrl.indexOf('kernelspecs');
       kernelIconUrl = baseUrl + kernelIconUrl.slice(index);
     }
     launcher.add({
       displayName,
       category: 'Notebook',
       name,
       iconClass: 'jp-NotebookRunningIcon',
       callback,
       rank,
       kernelIconUrl
     });
   }
 });