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: (
    app: JupyterFrontEnd,
    palette: ICommandPalette,
    mainMenu: IMainMenu | null
  ) => {
    // Create registry, retrieve all default providers
    const registry: SearchProviderRegistry = new SearchProviderRegistry();
    // TODO: Should register the default providers, with an application-specific
    // enabler.

    const activeSearches = new Map<string, SearchInstance>();

    const startCommand: string = 'documentsearch:start';
    const nextCommand: string = 'documentsearch:highlightNext';
    const prevCommand: string = 'documentsearch:highlightPrevious';
    app.commands.addCommand(startCommand, {
      label: 'Find…',
      isEnabled: () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        return registry.getProviderForWidget(currentWidget) !== undefined;
      },
      execute: () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        const widgetId = currentWidget.id;
        let searchInstance = activeSearches.get(widgetId);
        if (!searchInstance) {
          const searchProvider = registry.getProviderForWidget(currentWidget);
          if (!searchProvider) {
            return;
          }
          searchInstance = new SearchInstance(currentWidget, searchProvider);

          activeSearches.set(widgetId, searchInstance);
          // find next and previous are now enabled
          app.commands.notifyCommandChanged();

          searchInstance.disposed.connect(() => {
            activeSearches.delete(widgetId);
            // find next and previous are now not enabled
            app.commands.notifyCommandChanged();
          });
        }
        searchInstance.focusInput();
      }
    });

    app.commands.addCommand(nextCommand, {
      label: 'Find Next',
      isEnabled: () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        return activeSearches.has(currentWidget.id);
      },
      execute: async () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        const instance = activeSearches.get(currentWidget.id);
        if (!instance) {
          return;
        }

        await instance.provider.highlightNext();
        instance.updateIndices();
      }
    });

    app.commands.addCommand(prevCommand, {
      label: 'Find Previous',
      isEnabled: () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        return activeSearches.has(currentWidget.id);
      },
      execute: async () => {
        const currentWidget = app.shell.currentWidget;
        if (!currentWidget) {
          return;
        }
        const instance = activeSearches.get(currentWidget.id);
        if (!instance) {
          return;
        }

        await instance.provider.highlightPrevious();
        instance.updateIndices();
      }
    });

//.........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 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);
    });
  }

  /**
   * Whether there is an active console.
   */
  function hasWidget(): boolean {
    return tracker.currentWidget !== null;
  }

  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 {
//.........这里部分代码省略.........

/**
 * Add the main application commands.
 */
function addCommands(app: JupyterLab, palette: ICommandPalette): void {
  const category = 'Main Area';
  let command = CommandIDs.activateNextTab;

  app.commands.addCommand(command, {
    label: 'Activate Next Tab',
    execute: () => { app.shell.activateNextTab(); }
  });
  palette.addItem({ command, category });

  command = CommandIDs.activatePreviousTab;
  app.commands.addCommand(command, {
    label: 'Activate Previous Tab',
    execute: () => { app.shell.activatePreviousTab(); }
  });
  palette.addItem({ command, category });

  command = CommandIDs.closeAll;
  app.commands.addCommand(command, {
    label: 'Close All Widgets',
    execute: () => { app.shell.closeAll(); }
  });
  palette.addItem({ command, category });

  command = CommandIDs.toggleLeftArea;
  app.commands.addCommand(command, {
    label: args => args['isPalette'] ?
    'Toggle Left Area' : 'Show Left Area',
    execute: () => {
      if (app.shell.leftCollapsed) {
        app.shell.expandLeft();
      } else {
        app.shell.collapseLeft();
        app.shell.activateById(app.shell.currentWidget.id);
      }
    },
    isToggled: () => !app.shell.leftCollapsed,
    isVisible: () => !app.shell.isEmpty('left')
  });
  palette.addItem({ command, category, args: { 'isPalette': true } });

  command = CommandIDs.toggleRightArea;
  app.commands.addCommand(command, {
    label: args => args['isPalette'] ?
    'Toggle Right Area' : 'Show Right Area',
    execute: () => {
      if (app.shell.rightCollapsed) {
        app.shell.expandRight();
      } else {
        app.shell.collapseRight();
        app.shell.activateById(app.shell.currentWidget.id);
      }
    },
    isToggled: () => !app.shell.rightCollapsed,
    isVisible: () => !app.shell.isEmpty('right')
  });
  palette.addItem({ command, category, args: { 'isPalette': true } });

  command = CommandIDs.togglePresentationMode;
  app.commands.addCommand(command, {
    label: args => args['isPalette'] ?
      'Toggle Presentation Mode' : 'Presentation Mode',
    execute: () => {
      app.shell.presentationMode = !app.shell.presentationMode;
    },
    isToggled: () => app.shell.presentationMode,
    isVisible: () => true
  });
  palette.addItem({ command, category,  args: { 'isPalette': true } });

  command = CommandIDs.setMode;
  app.commands.addCommand(command, {
    isVisible: args => {
      const mode = args['mode'] as string;
      return mode === 'single-document' || mode === 'multiple-document';
    },
    execute: args => {
      const mode = args['mode'] as string;
      if (mode === 'single-document' || mode === 'multiple-document') {
        app.shell.mode = mode;
        return;
      }
      throw new Error(`Unsupported application shell mode: ${mode}`);
    }
  });

  command = CommandIDs.toggleMode;
  app.commands.addCommand(command, {
    label: args => args['isPalette'] ?
      'Toggle Single-Document Mode' : 'Single-Document Mode',
    isToggled: () => app.shell.mode === 'single-document',
    execute: () => {
      const args = app.shell.mode === 'multiple-document' ?
        { mode: 'single-document' } : { mode: 'multiple-document' };
      return app.commands.execute(CommandIDs.setMode, args);
    }
  });
//.........这里部分代码省略.........

 ].forEach(command => {
   palette.addItem({ command, category, args: { isPalette: true } });
 });

 ].forEach(command => palette.addItem({ command, category: 'Editor' }));

 manager.themes.forEach(theme => {
   palette.addItem({ command, args: { isPalette, theme }, category });
 });

 RESOURCES.forEach(args => {
   palette.addItem({ args, command: CommandIDs.open, category });
 });

 EXPORT_TO_FORMATS.forEach(exportToFormat => {
   let args = { 'format': exportToFormat['format'], 'label': exportToFormat['label'], 'isPalette': true };
   palette.addItem({ command: CommandIDs.exportToFormat, category: category, args: args });
 });