# -*- coding: utf-8 -*-
#
# Copyright © Spyder Project Contributors
# Licensed under the terms of the MIT License
# (see spyder/__init__.py for details)

"""
Spyder, the Scientific Python Development Environment
=====================================================

Developped and maintained by the Spyder Project
Contributors

Copyright © Spyder Project Contributors
Licensed under the terms of the MIT License
(see spyder/__init__.py for details)
"""

# =============================================================================
# Stdlib imports
# =============================================================================
from __future__ import print_function
from collections import OrderedDict
import errno
import gc
import logging
import os
import os.path as osp
import re
import shutil
import signal
import socket
import glob
import subprocess
import sys
import threading
import traceback
import importlib

logger = logging.getLogger(__name__)


#==============================================================================
# Keeping a reference to the original sys.exit before patching it
#==============================================================================
ORIGINAL_SYS_EXIT = sys.exit

#==============================================================================
# Check requirements
#==============================================================================
from spyder import requirements
requirements.check_path()
requirements.check_qt()
requirements.check_spyder_kernels()

#==============================================================================
# Windows only: support for hiding console window when started with python.exe
#==============================================================================
set_attached_console_visible = None
is_attached_console_visible = None
set_windows_appusermodelid = None
if os.name == 'nt':
    from spyder.utils.windows import (set_attached_console_visible,
                                      is_attached_console_visible,
                                      set_windows_appusermodelid)

#==============================================================================
# Qt imports
#==============================================================================
from qtpy import API, PYQT5
from qtpy.compat import from_qvariant
from qtpy.QtCore import (QByteArray, QCoreApplication, QPoint, QSize, Qt,
                         QThread, QTimer, QUrl, Signal, Slot,
                         qInstallMessageHandler)
from qtpy.QtGui import QColor, QDesktopServices, QIcon, QKeySequence, QPixmap
from qtpy.QtWidgets import (QAction, QApplication, QDesktopWidget, QDockWidget,
                            QMainWindow, QMenu, QMessageBox, QShortcut,
                            QSplashScreen, QStyleFactory, QWidget, QCheckBox)

# Avoid a "Cannot mix incompatible Qt library" error on Windows platforms
from qtpy import QtSvg  # analysis:ignore

# Avoid a bug in Qt: https://bugreports.qt.io/browse/QTBUG-46720
from qtpy import QtWebEngineWidgets  # analysis:ignore

# To catch font errors in QtAwesome
from qtawesome.iconic_font import FontError


#==============================================================================
# Proper high DPI scaling is available in Qt >= 5.6.0. This attibute must
# be set before creating the application.
#==============================================================================
from spyder.config.manager import CONF

if hasattr(Qt, 'AA_EnableHighDpiScaling'):
    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling,
                                  CONF.get('main', 'high_dpi_scaling'))

#==============================================================================
# Get CLI options and set OpenGL backend. This attibute must
# be set before creating the application. See spyder-ide/spyder#11227
#==============================================================================
from spyder.app.utils import set_opengl_implementation
from spyder.app.cli_options import get_options
from spyder.config.base import running_under_pytest

# Get CLI options/args and make them available for future use.
# Ignore args if running tests or Spyder will try and fail to parse pytests's.
if running_under_pytest():
    sys_argv = [sys.argv[0]]
    CLI_OPTIONS, CLI_ARGS = get_options(sys_argv)
else:
    CLI_OPTIONS, CLI_ARGS = get_options()

# **** Set OpenGL implementation to use ****
if CLI_OPTIONS.opengl_implementation:
    option = CLI_OPTIONS.opengl_implementation
    set_opengl_implementation(option)
else:
    if CONF.get('main', 'opengl') != 'automatic':
        option = CONF.get('main', 'opengl')
        set_opengl_implementation(option)

#==============================================================================
# Create our QApplication instance here because it's needed to render the
# splash screen created below
#==============================================================================
from spyder.utils.qthelpers import qapplication
from spyder.config.base import get_image_path
MAIN_APP = qapplication()

if PYQT5:
    APP_ICON = QIcon(get_image_path("spyder.svg"))
else:
    APP_ICON = QIcon(get_image_path("spyder.png"))

MAIN_APP.setWindowIcon(APP_ICON)

#==============================================================================
# Create splash screen out of MainWindow to reduce perceived startup time.
#==============================================================================
from spyder.config.base import _, get_image_path, DEV

if not running_under_pytest():
    SPLASH = QSplashScreen(QPixmap(get_image_path('Tellurium_splash.png'), 'png'))
    SPLASH_FONT = SPLASH.font()
    SPLASH_FONT.setPixelSize(10)
    SPLASH.setFont(SPLASH_FONT)
    SPLASH.show()
    SPLASH.showMessage(_("Initializing..."),
                       int(Qt.AlignBottom | Qt.AlignCenter | Qt.AlignAbsolute),
                       QColor(Qt.black))
    QApplication.processEvents()
else:
    SPLASH = None

#==============================================================================
# Local utility imports
#==============================================================================
from spyder import (__version__, __project_url__, __forum_url__,
                    __trouble_url__, __website_url__, get_versions)
from spyder.app.utils import (get_python_doc_path, delete_lsp_log_files,
                              qt_message_handler, setup_logging)
from spyder.config.base import (get_conf_path, get_module_source_path, STDERR,
                                get_debug_level, MAC_APP_NAME, get_home_dir,
                                running_in_mac_app, get_module_path,
                                reset_config_files)
from spyder.config.main import OPEN_FILES_PORT
from spyder.config.utils import IMPORT_EXT, is_anaconda, is_gtk_desktop
from spyder import dependencies
from spyder.py3compat import (is_text_string, to_text_string,
                              PY3, qbytearray_to_str, configparser as cp)
from spyder.utils import encoding, programs
from spyder.utils import icon_manager as ima
from spyder.utils.programs import is_module_installed
from spyder.utils.misc import select_port, getcwd_or_home, get_python_executable
from spyder.plugins.help.utils.sphinxify import CSS_PATH, DARK_CSS_PATH
from spyder.config.gui import is_dark_font_color

#==============================================================================
# Local gui imports
#==============================================================================
# NOTE: Move (if possible) import's of widgets and plugins exactly where they
# are needed in MainWindow to speed up perceived startup time (i.e. the time
# from clicking the Spyder icon to showing the splash screen).
try:
    from spyder.utils.environ import WinUserEnvDialog
except ImportError:
    WinUserEnvDialog = None  # analysis:ignore


from spyder.utils.qthelpers import (create_action, add_actions, get_icon,
                                    add_shortcut_to_tooltip,
                                    create_module_bookmark_actions,
                                    create_program_action, DialogManager,
                                    create_python_script_action, file_uri,
                                    MENU_SEPARATOR, set_menu_icons)
from spyder.otherplugins import get_spyderplugins_mods
from spyder.app import tour

#==============================================================================
# Third-party library imports
#==============================================================================
import qdarkstyle

#==============================================================================
# Get the cwd before initializing WorkingDirectory, which sets it to the one
# used in the last session
#==============================================================================
CWD = getcwd_or_home()

#==============================================================================
# Install Qt messaage handler
#==============================================================================
qInstallMessageHandler(qt_message_handler)

#==============================================================================
# Main Window
#==============================================================================
class MainWindow(QMainWindow):
    """Spyder main window"""
    DOCKOPTIONS = QMainWindow.AllowTabbedDocks|QMainWindow.AllowNestedDocks
    CURSORBLINK_OSDEFAULT = QApplication.cursorFlashTime()
    SPYDER_PATH = get_conf_path('path')
    SPYDER_NOT_ACTIVE_PATH = get_conf_path('not_active_path')
    BOOKMARKS = (
         ('Python2', "https://docs.python.org/2/index.html",
          _("Python2 documentation")),
         ('Python3', "https://docs.python.org/3/index.html",
          _("Python3 documentation")),
         ('numpy', "https://docs.scipy.org/doc/",
          _("Numpy and Scipy documentation")),
         ('matplotlib', "https://matplotlib.org/contents.html",
          _("Matplotlib documentation")),
         ('PyQt5',
          "https://www.riverbankcomputing.com/static/Docs/PyQt5/",
          _("PyQt5 Reference Guide")),
         ('PyQt5',
          "https://www.riverbankcomputing.com/static/Docs/PyQt5/module_index.html",
          _("PyQt5 API Reference")),
         ('winpython', "https://winpython.github.io/",
          _("WinPython"))
                )
    DEFAULT_LAYOUTS = 4

    # Signals
    restore_scrollbar_position = Signal()
    sig_setup_finished = Signal()
    all_actions_defined = Signal()
    # type: (OrderedDict, OrderedDict)
    sig_pythonpath_changed = Signal(object, object)
    sig_main_interpreter_changed = Signal()
    sig_open_external_file = Signal(str)
    sig_resized = Signal("QResizeEvent")     # Related to interactive tour
    sig_moved = Signal("QMoveEvent")         # Related to interactive tour
    sig_layout_setup_ready = Signal(object)  # Related to default layouts

    def __init__(self, options=None):
        QMainWindow.__init__(self)
        qapp = QApplication.instance()

        if running_under_pytest():
            self._proxy_style = None
        else:
            from spyder.utils.qthelpers import SpyderProxyStyle
            # None is needed, see: https://bugreports.qt.io/browse/PYSIDE-922
            self._proxy_style = SpyderProxyStyle(None)

        if PYQT5:
            # Enabling scaling for high dpi
            qapp.setAttribute(Qt.AA_UseHighDpiPixmaps)
        self.default_style = str(qapp.style().objectName())
        self.dialog_manager = DialogManager()

        self.init_workdir = options.working_directory
        self.profile = options.profile
        self.multithreaded = options.multithreaded
        self.new_instance = options.new_instance
        if options.project is not None:
            self.open_project = osp.normpath(osp.join(CWD, options.project))
        else:
            self.open_project = None
        self.window_title = options.window_title

        logger.info("Start of MainWindow constructor")

        def signal_handler(signum, frame=None):
            """Handler for signals."""
            sys.stdout.write('Handling signal: %s\n' % signum)
            sys.stdout.flush()
            QApplication.quit()

        if os.name == "nt":
            try:
                import win32api
                win32api.SetConsoleCtrlHandler(signal_handler, True)
            except ImportError:
                pass
        else:
            signal.signal(signal.SIGTERM, signal_handler)
            if not DEV:
                # Make spyder quit when presing ctrl+C in the console
                # In DEV Ctrl+C doesn't quit, because it helps to
                # capture the traceback when spyder freezes
                signal.signal(signal.SIGINT, signal_handler)

        # Use a custom Qt stylesheet
        if sys.platform == 'darwin':
            spy_path = get_module_source_path('spyder')
            img_path = osp.join(spy_path, 'images')
            mac_style = open(osp.join(spy_path, 'app', 'mac_stylesheet.qss')).read()
            mac_style = mac_style.replace('$IMAGE_PATH', img_path)
            self.setStyleSheet(mac_style)

        # Shortcut management data
        self.shortcut_data = []

        # Handle Spyder path
        self.path = ()
        self.not_active_path = ()
        self.project_path = ()

        # Plugins
        self.console = None
        self.workingdirectory = None
        self.editor = None
        self.explorer = None
        self.help = None
        self.onlinehelp = None
        self.projects = None
        self.outlineexplorer = None
        self.historylog = None
        self.ipyconsole = None
        self.variableexplorer = None
        self.plots = None
        self.findinfiles = None
        self.thirdparty_plugins = []

        # Tour  # TODO: Should I consider it a plugin?? or?
        self.tour = None
        self.tours_available = None

        # File switcher
        self.switcher = None

        # Check for updates Thread and Worker, refereces needed to prevent
        # segfaulting
        self.check_updates_action = None
        self.thread_updates = None
        self.worker_updates = None
        self.give_updates_feedback = True

        # Preferences
        from spyder.preferences.appearance import AppearanceConfigPage
        from spyder.preferences.general import MainConfigPage
        from spyder.preferences.shortcuts import ShortcutsConfigPage
        from spyder.preferences.runconfig import RunConfigPage
        from spyder.preferences.maininterpreter import MainInterpreterConfigPage
        self.general_prefs = [MainConfigPage, AppearanceConfigPage,
                              ShortcutsConfigPage, MainInterpreterConfigPage,
                              RunConfigPage]
        self.prefs_index = None
        self.prefs_dialog_size = None
        self.prefs_dialog_instance = None

        # Quick Layouts and Dialogs
        from spyder.preferences.layoutdialog import (LayoutSaveDialog,
                                                 LayoutSettingsDialog)
        self.dialog_layout_save = LayoutSaveDialog
        self.dialog_layout_settings = LayoutSettingsDialog

        # Actions
        self.lock_interface_action = None
        self.show_toolbars_action = None
        self.close_dockwidget_action = None
        self.undo_action = None
        self.redo_action = None
        self.copy_action = None
        self.cut_action = None
        self.paste_action = None
        self.selectall_action = None
        self.maximize_action = None
        self.fullscreen_action = None

        # Menu bars
        self.file_menu = None
        self.file_menu_actions = []
        self.edit_menu = None
        self.edit_menu_actions = []
        self.search_menu = None
        self.search_menu_actions = []
        self.source_menu = None
        self.source_menu_actions = []
        self.run_menu = None
        self.run_menu_actions = []
        self.debug_menu = None
        self.debug_menu_actions = []
        self.consoles_menu = None
        self.consoles_menu_actions = []
        self.projects_menu = None
        self.projects_menu_actions = []
        self.tools_menu = None
        self.tools_menu_actions = []
        self.external_tools_menu = None # We must keep a reference to this,
        # otherwise the external tools menu is lost after leaving setup method
        self.external_tools_menu_actions = []
        self.view_menu = None
        self.plugins_menu = None
        self.plugins_menu_actions = []
        self.toolbars_menu = None
        self.help_menu = None
        self.help_menu_actions = []

        # Status bar widgets
        self.conda_status = None
        self.mem_status = None
        self.cpu_status = None
        self.clock_status = None

        # Toolbars
        self.visible_toolbars = []
        self.toolbarslist = []
        self.main_toolbar = None
        self.main_toolbar_actions = []
        self.file_toolbar = None
        self.file_toolbar_actions = []
        self.edit_toolbar = None
        self.edit_toolbar_actions = []
        self.search_toolbar = None
        self.search_toolbar_actions = []
        self.source_toolbar = None
        self.source_toolbar_actions = []
        self.run_toolbar = None
        self.run_toolbar_actions = []
        self.debug_toolbar = None
        self.debug_toolbar_actions = []
        self.layout_toolbar = None
        self.layout_toolbar_actions = []

        self.menus = []

        if running_under_pytest():
            # Show errors in internal console when testing.
            CONF.set('main', 'show_internal_errors', False)

        # Set window title
        self.set_window_title()

        if set_windows_appusermodelid != None:
            res = set_windows_appusermodelid()
            logger.info("appusermodelid: %s", res)

        # Setting QTimer if running in travis
        test_travis = os.environ.get('TEST_CI_APP', None)
        if test_travis is not None:
            global MAIN_APP
            timer_shutdown_time = 30000
            self.timer_shutdown = QTimer(self)
            self.timer_shutdown.timeout.connect(MAIN_APP.quit)
            self.timer_shutdown.start(timer_shutdown_time)

        # Showing splash screen
        self.splash = SPLASH
        if CONF.get('main', 'current_version', '') != __version__:
            CONF.set('main', 'current_version', __version__)
            # Execute here the actions to be performed only once after
            # each update (there is nothing there for now, but it could
            # be useful some day...)

        # List of satellite widgets (registered in add_dockwidget):
        self.widgetlist = []

        # Flags used if closing() is called by the exit() shell command
        self.already_closed = False
        self.is_starting_up = True
        self.is_setting_up = True

        self.interface_locked = CONF.get('main', 'panes_locked')
        self.floating_dockwidgets = []
        self.window_size = None
        self.window_position = None
        self.state_before_maximizing = None
        self.current_quick_layout = None
        self.previous_layout_settings = None  # TODO: related to quick layouts
        self.last_plugin = None
        self.fullscreen_flag = None  # isFullscreen does not work as expected
        # The following flag remember the maximized state even when
        # the window is in fullscreen mode:
        self.maximized_flag = None
        # The following flag is used to restore window's geometry when
        # toggling out of fullscreen mode in Windows.
        self.saved_normal_geometry = None

        # To keep track of the last focused widget
        self.last_focused_widget = None
        self.previous_focused_widget = None

        # Keep track of dpi message
        self.show_dpi_message = True

        # Server to open external files on a single instance
        # This is needed in order to handle socket creation problems.
        # See spyder-ide/spyder#4132.
        if os.name == 'nt':
            try:
                self.open_files_server = socket.socket(socket.AF_INET,
                                                       socket.SOCK_STREAM,
                                                       socket.IPPROTO_TCP)
            except OSError as e:
                self.open_files_server = None
                QMessageBox.warning(None, "Spyder",
                         _("An error occurred while creating a socket needed "
                           "by Spyder. Please, try to run as an Administrator "
                           "from cmd.exe the following command and then "
                           "restart your computer: <br><br><span "
                           "style=\'color: #555555\'><b>netsh winsock reset"
                           "</b></span><br>"))
        else:
            self.open_files_server = socket.socket(socket.AF_INET,
                                                   socket.SOCK_STREAM,
                                                   socket.IPPROTO_TCP)

        # Apply preferences
        self.apply_settings()

        # To set all dockwidgets tabs to be on top (in case we want to do it
        # in the future)
        # self.setTabPosition(Qt.AllDockWidgetAreas, QTabWidget.North)

        logger.info("End of MainWindow constructor")

    #---- Window setup
    def create_toolbar(self, title, object_name, iconsize=24):
        """Create and return toolbar with *title* and *object_name*"""
        toolbar = self.addToolBar(title)
        toolbar.setObjectName(object_name)
        toolbar.setIconSize(QSize(iconsize, iconsize))
        self.toolbarslist.append(toolbar)
        return toolbar

    def setup(self):
        """Setup main window"""
        logger.info("*** Start of MainWindow setup ***")

        logger.info("Updating PYTHONPATH")
        path_dict = self.get_spyder_pythonpath_dict()
        self.update_python_path(path_dict)

        logger.info("Applying theme configuration...")
        ui_theme = CONF.get('appearance', 'ui_theme')
        color_scheme = CONF.get('appearance', 'selected')

        if ui_theme == 'dark':
            if not running_under_pytest():
                # Set style proxy to fix combobox popup on mac and qdark
                qapp = QApplication.instance()
                qapp.setStyle(self._proxy_style)
            dark_qss = qdarkstyle.load_stylesheet_from_environment()
            self.setStyleSheet(dark_qss)
            self.statusBar().setStyleSheet(dark_qss)
            css_path = DARK_CSS_PATH
        elif ui_theme == 'automatic':
            if not is_dark_font_color(color_scheme):
                if not running_under_pytest():
                    # Set style proxy to fix combobox popup on mac and qdark
                    qapp = QApplication.instance()
                    qapp.setStyle(self._proxy_style)
                dark_qss = qdarkstyle.load_stylesheet_from_environment()
                self.setStyleSheet(dark_qss)
                self.statusBar().setStyleSheet(dark_qss)
                css_path = DARK_CSS_PATH
            else:
                css_path = CSS_PATH
        else:
            css_path = CSS_PATH

        logger.info("Creating core actions...")
        self.close_dockwidget_action = create_action(
            self, icon=ima.icon('close_pane'),
            text=_("Close current pane"),
            triggered=self.close_current_dockwidget,
            context=Qt.ApplicationShortcut
        )
        self.register_shortcut(self.close_dockwidget_action, "_",
                               "Close pane")
        self.lock_interface_action = create_action(
            self,
            _("Lock panes and toolbars"),
            toggled=self.toggle_lock,
            context=Qt.ApplicationShortcut)
        self.register_shortcut(self.lock_interface_action, "_",
                               "Lock unlock panes")
        # custom layouts shortcuts
        self.toggle_next_layout_action = create_action(self,
                                    _("Use next layout"),
                                    triggered=self.toggle_next_layout,
                                    context=Qt.ApplicationShortcut)
        self.toggle_previous_layout_action = create_action(self,
                                    _("Use previous layout"),
                                    triggered=self.toggle_previous_layout,
                                    context=Qt.ApplicationShortcut)
        self.register_shortcut(self.toggle_next_layout_action, "_",
                               "Use next layout")
        self.register_shortcut(self.toggle_previous_layout_action, "_",
                               "Use previous layout")
        # Switcher shortcuts
        self.file_switcher_action = create_action(
                                    self,
                                    _('File switcher...'),
                                    icon=ima.icon('filelist'),
                                    tip=_('Fast switch between files'),
                                    triggered=self.open_switcher,
                                    context=Qt.ApplicationShortcut)
        self.register_shortcut(self.file_switcher_action, context="_",
                               name="File switcher")
        self.symbol_finder_action = create_action(
                                    self, _('Symbol finder...'),
                                    icon=ima.icon('symbol_find'),
                                    tip=_('Fast symbol search in file'),
                                    triggered=self.open_symbolfinder,
                                    context=Qt.ApplicationShortcut)
        self.register_shortcut(self.symbol_finder_action, context="_",
                               name="symbol finder", add_shortcut_to_tip=True)
        self.file_toolbar_actions = [self.file_switcher_action,
                                     self.symbol_finder_action]

        def create_edit_action(text, tr_text, icon):
            textseq = text.split(' ')
            method_name = textseq[0].lower()+"".join(textseq[1:])
            action = create_action(self, tr_text,
                                   icon=icon,
                                   triggered=self.global_callback,
                                   data=method_name,
                                   context=Qt.WidgetShortcut)
            self.register_shortcut(action, "Editor", text)
            return action

        self.undo_action = create_edit_action('Undo', _('Undo'),
                                              ima.icon('undo'))
        self.redo_action = create_edit_action('Redo', _('Redo'),
                                              ima.icon('redo'))
        self.copy_action = create_edit_action('Copy', _('Copy'),
                                              ima.icon('editcopy'))
        self.cut_action = create_edit_action('Cut', _('Cut'),
                                             ima.icon('editcut'))
        self.paste_action = create_edit_action('Paste', _('Paste'),
                                               ima.icon('editpaste'))
        self.selectall_action = create_edit_action("Select All",
                                                   _("Select All"),
                                                   ima.icon('selectall'))

        self.edit_menu_actions = [self.undo_action, self.redo_action,
                                  None, self.cut_action, self.copy_action,
                                  self.paste_action, self.selectall_action]

        logger.info("Creating toolbars...")
        # File menu/toolbar
        self.file_menu = self.menuBar().addMenu(_("&File"))
        self.file_toolbar = self.create_toolbar(_("File toolbar"),
                                                "file_toolbar")
        # Edit menu/toolbar
        self.edit_menu = self.menuBar().addMenu(_("&Edit"))
        self.edit_toolbar = self.create_toolbar(_("Edit toolbar"),
                                                "edit_toolbar")
        # Search menu/toolbar
        self.search_menu = self.menuBar().addMenu(_("&Search"))
        self.search_toolbar = self.create_toolbar(_("Search toolbar"),
                                                   "search_toolbar")
        # Source menu/toolbar
        self.source_menu = self.menuBar().addMenu(_("Sour&ce"))
        self.source_toolbar = self.create_toolbar(_("Source toolbar"),
                                                    "source_toolbar")
        # Run menu/toolbar
        self.run_menu = self.menuBar().addMenu(_("&Run"))
        self.run_toolbar = self.create_toolbar(_("Run toolbar"),
                                                "run_toolbar")

        # Debug menu/toolbar
        self.debug_menu = self.menuBar().addMenu(_("&Debug"))
        self.debug_toolbar = self.create_toolbar(_("Debug toolbar"),
                                                    "debug_toolbar")

        # Consoles menu/toolbar
        self.consoles_menu = self.menuBar().addMenu(_("C&onsoles"))
        self.consoles_menu.aboutToShow.connect(
                self.update_execution_state_kernel)

        # Projects menu
        self.projects_menu = self.menuBar().addMenu(_("&Projects"))
        self.projects_menu.aboutToShow.connect(self.valid_project)

        # Tools menu
        self.tools_menu = self.menuBar().addMenu(_("&Tools"))

        # View menu
        self.view_menu = self.menuBar().addMenu(_("&View"))

        # Help menu
        self.help_menu = self.menuBar().addMenu(_("&Help"))

        # Status bar
        status = self.statusBar()
        status.setObjectName("StatusBar")
        status.showMessage(_("Welcome to Spyder!"), 5000)

        logger.info("Creating Tools menu...")
        # Tools + External Tools
        prefs_action = create_action(self, _("Pre&ferences"),
                                     icon=ima.icon('configure'),
                                     triggered=self.show_preferences,
                                     context=Qt.ApplicationShortcut)
        self.register_shortcut(prefs_action, "_", "Preferences",
                               add_shortcut_to_tip=True)
        spyder_path_action = create_action(self,
                                _("PYTHONPATH manager"),
                                None, icon=ima.icon('pythonpath'),
                                triggered=self.show_path_manager,
                                tip=_("Python Path Manager"),
                                menurole=QAction.ApplicationSpecificRole)
        reset_spyder_action = create_action(
            self, _("Reset Spyder to factory defaults"),
            triggered=self.reset_spyder)
        self.tools_menu_actions = [prefs_action, spyder_path_action]
        if WinUserEnvDialog is not None:
            winenv_action = create_action(self,
                    _("Current user environment variables..."),
                    icon='win_env.png',
                    tip=_("Show and edit current user environment "
                            "variables in Windows registry "
                            "(i.e. for all sessions)"),
                    triggered=self.win_env)
            self.tools_menu_actions.append(winenv_action)
        from spyder.plugins.completion.kite.utils.install import (
            check_if_kite_installed)
        is_kite_installed, kite_path = check_if_kite_installed()
        if not is_kite_installed:
            install_kite_action = create_action(
                self, _("Install Kite completion engine"),
                icon=get_icon('kite', adjust_for_interface=True),
                triggered=self.show_kite_installation)
            self.tools_menu_actions.append(install_kite_action)
        self.tools_menu_actions += [MENU_SEPARATOR, reset_spyder_action]
        if get_debug_level() >= 3:
            self.menu_lsp_logs = QMenu(_("LSP logs"))
            self.menu_lsp_logs.aboutToShow.connect(self.update_lsp_logs)
            self.tools_menu_actions += [self.menu_lsp_logs]
        # External Tools submenu
        self.external_tools_menu = QMenu(_("External Tools"))
        self.external_tools_menu_actions = []

        # WinPython control panel
        self.wp_action = create_action(self, _("WinPython control panel"),
                    icon=get_icon('winpython.svg'),
                    triggered=lambda:
                    programs.run_python_script('winpython', 'controlpanel'))
        if os.name == 'nt' and is_module_installed('winpython'):
            self.external_tools_menu_actions.append(self.wp_action)

        # Qt-related tools
        additact = []
        for name in ("designer-qt4", "designer"):
            qtdact = create_program_action(self, _("Qt Designer"), name)
            if qtdact:
                break
        for name in ("linguist-qt4", "linguist"):
            qtlact = create_program_action(self, _("Qt Linguist"), "linguist")
            if qtlact:
                break
        args = ['-no-opengl'] if os.name == 'nt' else []
        for act in (qtdact, qtlact):
            if act:
                additact.append(act)
        if additact and is_module_installed('winpython'):
            self.external_tools_menu_actions += [None] + additact

        # Guidata and Sift
        logger.info("Creating guidata and sift entries...")
        gdgq_act = []
        # Guidata and Guiqwt don't support PyQt5 yet and they fail
        # with an AssertionError when imported using those bindings
        # (see spyder-ide/spyder#2274)
        try:
            from guidata import configtools
            from guidata import config       # analysis:ignore
            guidata_icon = configtools.get_icon('guidata.svg')
            guidata_act = create_python_script_action(self,
                                    _("guidata examples"), guidata_icon,
                                    "guidata",
                                    osp.join("tests", "__init__"))
            gdgq_act += [guidata_act]
        except:
            pass
        try:
            from guidata import configtools
            from guiqwt import config  # analysis:ignore
            guiqwt_icon = configtools.get_icon('guiqwt.svg')
            guiqwt_act = create_python_script_action(self,
                            _("guiqwt examples"), guiqwt_icon, "guiqwt",
                            osp.join("tests", "__init__"))
            if guiqwt_act:
                gdgq_act += [guiqwt_act]
            sift_icon = configtools.get_icon('sift.svg')
            sift_act = create_python_script_action(self, _("Sift"),
                        sift_icon, "guiqwt", osp.join("tests", "sift"))
            if sift_act:
                gdgq_act += [sift_act]
        except:
            pass
        if gdgq_act:
            self.external_tools_menu_actions += [None] + gdgq_act

        # Maximize current plugin
        self.maximize_action = create_action(self, '',
                                        triggered=self.maximize_dockwidget,
                                        context=Qt.ApplicationShortcut)
        self.register_shortcut(self.maximize_action, "_", "Maximize pane")
        self.__update_maximize_action()

        # Fullscreen mode
        self.fullscreen_action = create_action(self,
                                        _("Fullscreen mode"),
                                        triggered=self.toggle_fullscreen,
                                        context=Qt.ApplicationShortcut)
        self.register_shortcut(self.fullscreen_action, "_",
                               "Fullscreen mode", add_shortcut_to_tip=True)

        # Main toolbar
        self.main_toolbar_actions = [self.maximize_action,
                                     self.fullscreen_action,
                                     None,
                                     prefs_action, spyder_path_action]

        self.main_toolbar = self.create_toolbar(_("Main toolbar"),
                                                "main_toolbar")

        # Switcher instance
        logger.info("Loading switcher...")
        self.create_switcher()

        # Internal console plugin
        logger.info("Loading internal console...")
        from spyder.plugins.console.plugin import Console
        self.console = Console(self, namespace=None, exitfunc=self.closing,
                            profile=self.profile,
                            multithreaded=self.multithreaded,
                            message=_("Spyder Internal Console\n\n"
                                    "This console is used to report application\n"
                                    "internal errors and to inspect Spyder\n"
                                    "internals with the following commands:\n"
                                    "  spy.app, spy.window, dir(spy)\n\n"
                                    "Please don't use it to run your code\n\n"))
        self.console.register_plugin()

        # Code completion client initialization
        self.set_splash(_("Starting code completion manager..."))
        from spyder.plugins.completion.plugin import CompletionManager
        self.completions = CompletionManager(self)

        # Working directory plugin
        logger.info("Loading working directory...")
        from spyder.plugins.workingdirectory.plugin import WorkingDirectory
        self.workingdirectory = WorkingDirectory(self, self.init_workdir, main=self)
        self.workingdirectory.register_plugin()
        self.toolbarslist.append(self.workingdirectory.toolbar)

        # Help plugin
        if CONF.get('help', 'enable'):
            self.set_splash(_("Loading help..."))
            from spyder.plugins.help.plugin import Help
            self.help = Help(self, css_path=css_path)
            self.help.register_plugin()

        # Outline explorer widget
        if CONF.get('outline_explorer', 'enable'):
            self.set_splash(_("Loading outline explorer..."))
            from spyder.plugins.outlineexplorer.plugin import OutlineExplorer
            self.outlineexplorer = OutlineExplorer(self)
            self.outlineexplorer.register_plugin()

        if is_anaconda():
            from spyder.widgets.status import CondaStatus
            self.conda_status = CondaStatus(self, status,
                                            icon=ima.icon('environment'))
            self.conda_status.update_interpreter(self.get_main_interpreter())

        # Editor plugin
        self.set_splash(_("Loading editor..."))
        from spyder.plugins.editor.plugin import Editor
        self.editor = Editor(self)
        self.editor.register_plugin()

        # Start code completion client
        self.set_splash(_("Launching code completion client for Python..."))
        self.completions.start()
        self.completions.start_client(language='python')

        # Populating file menu entries
        quit_action = create_action(self, _("&Quit"),
                                    icon=ima.icon('exit'),
                                    tip=_("Quit"),
                                    triggered=self.console.quit,
                                    context=Qt.ApplicationShortcut)
        self.register_shortcut(quit_action, "_", "Quit")
        restart_action = create_action(self, _("&Restart"),
                                       icon=ima.icon('restart'),
                                       tip=_("Restart"),
                                       triggered=self.restart,
                                       context=Qt.ApplicationShortcut)
        self.register_shortcut(restart_action, "_", "Restart")

        file_actions = [
            self.file_switcher_action,
            self.symbol_finder_action,
            None,
        ]
        if sys.platform == 'darwin':
            file_actions.extend(self.editor.tab_navigation_actions + [None])

        file_actions.extend([restart_action, quit_action])
        self.file_menu_actions += file_actions
        self.set_splash("")

        # Namespace browser
        self.set_splash(_("Loading namespace browser..."))
        from spyder.plugins.variableexplorer.plugin import VariableExplorer
        self.variableexplorer = VariableExplorer(self)
        self.variableexplorer.register_plugin()

        # Figure browser
        self.set_splash(_("Loading figure browser..."))
        from spyder.plugins.plots.plugin import Plots
        self.plots = Plots(self)
        self.plots.register_plugin()

        # History log widget
        if CONF.get('historylog', 'enable'):
            self.set_splash(_("Loading history plugin..."))
            from spyder.plugins.history.plugin import HistoryLog
            self.historylog = HistoryLog(self)
            self.historylog.register_plugin()

        # IPython console
        self.set_splash(_("Loading IPython console..."))
        from spyder.plugins.ipythonconsole.plugin import IPythonConsole
        self.ipyconsole = IPythonConsole(self, css_path=css_path)
        self.ipyconsole.register_plugin()

        # Explorer
        if CONF.get('explorer', 'enable'):
            self.set_splash(_("Loading file explorer..."))
            from spyder.plugins.explorer.plugin import Explorer
            self.explorer = Explorer(self)
            self.explorer.register_plugin()

        # Online help widget
        if CONF.get('onlinehelp', 'enable'):
            self.set_splash(_("Loading online help..."))
            from spyder.plugins.onlinehelp.plugin import OnlineHelp
            self.onlinehelp = OnlineHelp(self)
            self.onlinehelp.register_plugin()

        # Project explorer widget
        self.set_splash(_("Loading project explorer..."))
        from spyder.plugins.projects.plugin import Projects
        self.projects = Projects(self)
        self.projects.register_plugin()
        self.project_path = self.projects.get_pythonpath(at_start=True)

        # Find in files
        if CONF.get('find_in_files', 'enable'):
            from spyder.plugins.findinfiles.plugin import FindInFiles
            self.findinfiles = FindInFiles(self)
            self.findinfiles.register_plugin()

        # Load other plugins (former external plugins)
        # TODO: Use this bucle to load all internall plugins and remove
        # duplicated code
        other_plugins = ['breakpoints', 'profiler', 'pylint']
        for plugin_name in other_plugins:
            if CONF.get(plugin_name, 'enable'):
                module = importlib.import_module(
                        'spyder.plugins.{}'.format(plugin_name))
                plugin = module.PLUGIN_CLASS(self)
                if plugin.check_compatibility()[0]:
                    self.thirdparty_plugins.append(plugin)
                    plugin.register_plugin()

        # Third-party plugins
        from spyder import dependencies

        self.set_splash(_("Loading third-party plugins..."))
        for mod in get_spyderplugins_mods():
            try:
                plugin = mod.PLUGIN_CLASS(self)
                if plugin.check_compatibility()[0]:
                    if hasattr(plugin, 'COMPLETION_CLIENT_NAME'):
                        self.completions.register_completion_plugin(plugin)
                    else:
                        self.thirdparty_plugins.append(plugin)
                        plugin.register_plugin()

                    # Add to dependencies dialog
                    module = mod.__name__
                    name = module.replace('_', '-')
                    if plugin.DESCRIPTION:
                        description = plugin.DESCRIPTION
                    else:
                        description = plugin.get_plugin_title()

                    dependencies.add(module, name, description,
                                     '', None, kind=dependencies.PLUGIN)

            except Exception as error:
                print("%s: %s" % (mod, str(error)), file=STDERR)
                traceback.print_exc(file=STDERR)

        self.set_splash(_("Setting up main window..."))

        # Help menu
        trouble_action = create_action(self,
                                        _("Troubleshooting..."),
                                        triggered=self.trouble_guide)
        dep_action = create_action(self, _("Dependencies..."),
                                    triggered=self.show_dependencies,
                                    icon=ima.icon('advanced'))
        report_action = create_action(self,
                                        _("Report issue..."),
                                        icon=ima.icon('bug'),
                                        triggered=self.report_issue)
        support_action = create_action(self,
                                        _("Spyder support..."),
                                        triggered=self.google_group)
        self.check_updates_action = create_action(self,
                                                _("Check for updates..."),
                                                triggered=self.check_updates)

        # Spyder documentation
        spyder_doc = 'https://docs.spyder-ide.org/'
        doc_action = create_action(self, _("Spyder documentation"),
                                   icon=ima.icon('DialogHelpButton'),
                                   triggered=lambda:
                                   programs.start_file(spyder_doc))
        self.register_shortcut(doc_action, "_",
                               "spyder documentation")

        if self.help is not None:
            tut_action = create_action(self, _("Spyder tutorial"),
                                       triggered=self.help.show_tutorial)
        else:
            tut_action = None

        shortcuts_action = create_action(self, _("Shortcuts Summary"),
                                         shortcut="Meta+F1",
                                         triggered=self.show_shortcuts_dialog)

        #----- Tours
        self.tour = tour.AnimatedTour(self)
        self.tours_menu = QMenu(_("Interactive tours"), self)
        self.tour_menu_actions = []
        # TODO: Only show intro tour for now. When we are close to finish
        # 3.0, we will finish and show the other tour
        self.tours_available = tour.get_tours(0)

        for i, tour_available in enumerate(self.tours_available):
            self.tours_available[i]['last'] = 0
            tour_name = tour_available['name']

            def trigger(i=i, self=self):  # closure needed!
                return lambda: self.show_tour(i)

            temp_action = create_action(self, tour_name, tip="",
                                        triggered=trigger())
            self.tour_menu_actions += [temp_action]

        self.tours_menu.addActions(self.tour_menu_actions)

        self.help_menu_actions = [doc_action, tut_action, shortcuts_action,
                                  self.tours_menu,
                                  MENU_SEPARATOR, trouble_action,
                                  report_action, dep_action,
                                  self.check_updates_action, support_action,
                                  MENU_SEPARATOR]
        # Python documentation
        if get_python_doc_path() is not None:
            pydoc_act = create_action(self, _("Python documentation"),
                                triggered=lambda:
                                programs.start_file(get_python_doc_path()))
            self.help_menu_actions.append(pydoc_act)
        # IPython documentation
        if self.help is not None:
            ipython_menu = QMenu(_("IPython documentation"), self)
            intro_action = create_action(self, _("Intro to IPython"),
                                        triggered=self.ipyconsole.show_intro)
            quickref_action = create_action(self, _("Quick reference"),
                                    triggered=self.ipyconsole.show_quickref)
            guiref_action = create_action(self, _("Console help"),
                                        triggered=self.ipyconsole.show_guiref)
            add_actions(ipython_menu, (intro_action, guiref_action,
                                        quickref_action))
            self.help_menu_actions.append(ipython_menu)
        # Windows-only: documentation located in sys.prefix/Doc
        ipm_actions = []
        def add_ipm_action(text, path):
            """Add installed Python module doc action to help submenu"""
            # QAction.triggered works differently for PySide and PyQt
            path = file_uri(path)
            if not API == 'pyside':
                slot=lambda _checked, path=path: programs.start_file(path)
            else:
                slot=lambda path=path: programs.start_file(path)
            action = create_action(self, text,
                    icon='%s.png' % osp.splitext(path)[1][1:],
                    triggered=slot)
            ipm_actions.append(action)
        sysdocpth = osp.join(sys.prefix, 'Doc')
        if osp.isdir(sysdocpth): # exists on Windows, except frozen dist.
            for docfn in os.listdir(sysdocpth):
                pt = r'([a-zA-Z\_]*)(doc)?(-dev)?(-ref)?(-user)?.(chm|pdf)'
                match = re.match(pt, docfn)
                if match is not None:
                    pname = match.groups()[0]
                    if pname not in ('Python', ):
                        add_ipm_action(pname, osp.join(sysdocpth, docfn))
        # Installed Python modules submenu (Windows only)
        if ipm_actions:
            pymods_menu = QMenu(_("Installed Python modules"), self)
            add_actions(pymods_menu, ipm_actions)
            self.help_menu_actions.append(pymods_menu)
        # Online documentation
        web_resources = QMenu(_("Online documentation"), self)
        webres_actions = create_module_bookmark_actions(self,
                                                        self.BOOKMARKS)
        webres_actions.insert(2, None)
        webres_actions.insert(5, None)
        webres_actions.insert(8, None)
        add_actions(web_resources, webres_actions)
        self.help_menu_actions.append(web_resources)
        # Qt assistant link
        if sys.platform.startswith('linux') and not PYQT5:
            qta_exe = "assistant-qt4"
        else:
            qta_exe = "assistant"
        qta_act = create_program_action(self, _("Qt documentation"),
                                        qta_exe)
        if qta_act:
            self.help_menu_actions += [qta_act, None]

        # About Spyder
        about_action = create_action(self,
                                _("About %s...") % "Spyder",
                                icon=ima.icon('MessageBoxInformation'),
                                triggered=self.about)
        self.help_menu_actions += [MENU_SEPARATOR, about_action]

        # Status bar widgets
        from spyder.widgets.status import MemoryStatus, CPUStatus, ClockStatus
        self.mem_status = MemoryStatus(self, status)
        self.cpu_status = CPUStatus(self, status)
        self.clock_status = ClockStatus(self, status)
        self.apply_statusbar_settings()

        # ----- View
        # View menu
        self.plugins_menu = QMenu(_("Panes"), self)

        self.toolbars_menu = QMenu(_("Toolbars"), self)
        self.quick_layout_menu = QMenu(_("Window layouts"), self)
        self.quick_layout_set_menu()

        self.view_menu.addMenu(self.plugins_menu)  # Panes
        add_actions(self.view_menu, (self.lock_interface_action,
                                     self.close_dockwidget_action,
                                     self.maximize_action,
                                     MENU_SEPARATOR))
        self.show_toolbars_action = create_action(self,
                                _("Show toolbars"),
                                triggered=self.show_toolbars,
                                context=Qt.ApplicationShortcut)
        self.register_shortcut(self.show_toolbars_action, "_",
                               "Show toolbars")
        self.view_menu.addMenu(self.toolbars_menu)
        self.view_menu.addAction(self.show_toolbars_action)
        add_actions(self.view_menu, (MENU_SEPARATOR,
                                     self.quick_layout_menu,
                                     self.toggle_previous_layout_action,
                                     self.toggle_next_layout_action,
                                     MENU_SEPARATOR,
                                     self.fullscreen_action))
        if set_attached_console_visible is not None:
            cmd_act = create_action(self,
                                _("Attached console window (debugging)"),
                                toggled=set_attached_console_visible)
            cmd_act.setChecked(is_attached_console_visible())
            add_actions(self.view_menu, (MENU_SEPARATOR, cmd_act))

        # Adding external tools action to "Tools" menu
        if self.external_tools_menu_actions:
            external_tools_act = create_action(self, _("External Tools"))
            external_tools_act.setMenu(self.external_tools_menu)
            self.tools_menu_actions += [None, external_tools_act]

        # Filling out menu/toolbar entries:
        add_actions(self.file_menu, self.file_menu_actions)
        add_actions(self.edit_menu, self.edit_menu_actions)
        add_actions(self.search_menu, self.search_menu_actions)
        add_actions(self.source_menu, self.source_menu_actions)
        add_actions(self.run_menu, self.run_menu_actions)
        add_actions(self.debug_menu, self.debug_menu_actions)
        add_actions(self.consoles_menu, self.consoles_menu_actions)
        add_actions(self.projects_menu, self.projects_menu_actions)
        add_actions(self.tools_menu, self.tools_menu_actions)
        add_actions(self.external_tools_menu,
                    self.external_tools_menu_actions)
        add_actions(self.help_menu, self.help_menu_actions)

        add_actions(self.main_toolbar, self.main_toolbar_actions)
        add_actions(self.file_toolbar, self.file_toolbar_actions)
        add_actions(self.edit_toolbar, self.edit_toolbar_actions)
        add_actions(self.search_toolbar, self.search_toolbar_actions)
        add_actions(self.source_toolbar, self.source_toolbar_actions)
        add_actions(self.debug_toolbar, self.debug_toolbar_actions)
        add_actions(self.run_toolbar, self.run_toolbar_actions)

        # Apply all defined shortcuts (plugins + 3rd-party plugins)
        self.apply_shortcuts()

        # Emitting the signal notifying plugins that main window menu and
        # toolbar actions are all defined:
        self.all_actions_defined.emit()

        # Window set-up
        logger.info("Setting up window...")
        self.setup_layout(default=False)

        if self.splash is not None:
            self.splash.hide()

        # Enabling tear off for all menus except help menu
        if CONF.get('main', 'tear_off_menus'):
            for child in self.menuBar().children():
                if isinstance(child, QMenu) and child != self.help_menu:
                    child.setTearOffEnabled(True)

        # Menu about to show
        for child in self.menuBar().children():
            if isinstance(child, QMenu):
                try:
                    child.aboutToShow.connect(self.update_edit_menu)
                    child.aboutToShow.connect(self.update_search_menu)
                except TypeError:
                    pass

        logger.info("*** End of MainWindow setup ***")
        self.is_starting_up = False

    def setup_menus(self):
        """Setup menus."""
        # Update menus list
        default_menus = [self.file_menu, self.edit_menu, self.search_menu,
                         self.source_menu, self.run_menu, self.debug_menu,
                         self.consoles_menu, self.projects_menu,
                         self.tools_menu, self.view_menu, self.help_menu]
        self.menus = self.menus + default_menus

        # Show and hide shortcuts and icons in menus for macOS
        if sys.platform == 'darwin':
            for menu in self.menus:
                if menu is not None:
                    menu.aboutToShow.connect(
                        lambda menu=menu: self.show_shortcuts(menu))
                    menu.aboutToHide.connect(
                        lambda menu=menu: self.hide_shortcuts(menu))
                    menu.aboutToShow.connect(
                        lambda menu=menu: set_menu_icons(menu, False))
                    menu.aboutToShow.connect(self.hide_options_menus)

    def update_lsp_logs(self):
        """Create an action for each lsp log file."""
        self.menu_lsp_logs.clear()
        lsp_logs = []
        regex = re.compile(r'.*_.*_(\d+)[.]log')
        files = glob.glob(osp.join(get_conf_path('lsp_logs'), '*.log'))
        for f in files:
            action = create_action(self, f, triggered=self.editor.load)
            action.setData(f)
            lsp_logs.append(action)
        add_actions(self.menu_lsp_logs, lsp_logs)

    def post_visible_setup(self):
        """Actions to be performed only after the main window's `show` method
        was triggered"""
        self.restore_scrollbar_position.emit()

        logger.info('Deleting previous Spyder instance LSP logs...')
        delete_lsp_log_files()

        # Workaround for spyder-ide/spyder#880.
        # QDockWidget objects are not painted if restored as floating
        # windows, so we must dock them before showing the mainwindow,
        # then set them again as floating windows here.
        for widget in self.floating_dockwidgets:
            widget.setFloating(True)

        # In MacOS X 10.7 our app is not displayed after initialized (I don't
        # know why because this doesn't happen when started from the terminal),
        # so we need to resort to this hack to make it appear.
        if running_in_mac_app():
            idx = __file__.index(MAC_APP_NAME)
            app_path = __file__[:idx]
            subprocess.call(['open', app_path + MAC_APP_NAME])

        # Server to maintain just one Spyder instance and open files in it if
        # the user tries to start other instances with
        # $ spyder foo.py
        if (CONF.get('main', 'single_instance') and not self.new_instance
                and self.open_files_server):
            t = threading.Thread(target=self.start_open_files_server)
            t.setDaemon(True)
            t.start()

            # Connect the window to the signal emmited by the previous server
            # when it gets a client connected to it
            self.sig_open_external_file.connect(self.open_external_file)

        # Create Plugins and toolbars submenus
        self.create_plugins_menu()
        self.create_toolbars_menu()

        # Update toolbar visibility status
        self.toolbars_visible = CONF.get('main', 'toolbars_visible')
        self.load_last_visible_toolbars()

        # Update lock status
        self.lock_interface_action.setChecked(self.interface_locked)

        # Hide Internal Console so that people don't use it instead of
        # the External or IPython ones
        if self.console.dockwidget.isVisible() and DEV is None:
            self.console._toggle_view_action.setChecked(False)
            self.console.dockwidget.hide()

        # Show Help and Consoles by default
        plugins_to_show = [self.ipyconsole]
        if self.help is not None:
            plugins_to_show.append(self.help)
        for plugin in plugins_to_show:
            if plugin.dockwidget.isVisible():
                plugin.dockwidget.raise_()

        # Show history file if no console is visible
        if not self.ipyconsole._isvisible:
            self.historylog.add_history(get_conf_path('history.py'))

        if self.open_project:
            self.projects.open_project(self.open_project)
        else:
            # Load last project if a project was active when Spyder
            # was closed
            self.projects.reopen_last_project()

            # If no project is active, load last session
            if self.projects.get_active_project() is None:
                self.editor.setup_open_files()

        # Connect Editor to Kite completions plugin status
        self.editor.kite_completions_file_status()

        # Connect Editor debug action with Console
        self.ipyconsole.sig_pdb_state.connect(self.editor.update_pdb_state)

        # Setup menus
        self.setup_menus()

        # Check for spyder updates
        if DEV is None and CONF.get('main', 'check_updates_on_startup'):
            self.give_updates_feedback = False
            self.check_updates(startup=True)

        # Show dialog with missing dependencies
        if not running_under_pytest():
            self.report_missing_dependencies()

        # Raise the menuBar to the top of the main window widget's stack
        # Fixes spyder-ide/spyder#3887.
        self.menuBar().raise_()
        self.is_setting_up = False

        # Handle DPI scale and window changes to show a restart message
        # Handle DPI scale and window changes to show a restart message.
        # Don't activate this functionality on macOS because it's being
        # triggered in the wrong situations.
        # See spyder-ide/spyder#11846
        if not sys.platform == 'darwin':
            window = self.window().windowHandle()
            window.screenChanged.connect(self.handle_new_screen)
            self.screen = self.window().windowHandle().screen()
            self.screen.logicalDotsPerInchChanged.connect(
                self.show_dpi_change_message)

        # Notify that the setup of the mainwindow was finished
        self.sig_setup_finished.emit()

    def handle_new_screen(self, screen):
        """Connect DPI signals for new screen."""
        try:
            self.screen.logicalDotsPerInchChanged.disconnect(
                self.show_dpi_change_message)
        except (TypeError, RuntimeError):
            # See spyder-ide/spyder#11903 and spyder-ide/spyder#11997
            pass
        self.screen = screen
        self.screen.logicalDotsPerInchChanged.connect(
            self.show_dpi_change_message)

    def show_dpi_change_message(self):
        """Show message to restart Spyder since the DPI scale changed."""
        self.screen.logicalDotsPerInchChanged.disconnect(
            self.show_dpi_change_message)

        if not self.show_dpi_message:
            return

        # Check the window state to not show the message if the window
        # is in fullscreen mode.
        window = self.window().windowHandle()
        if (window.windowState() == Qt.WindowFullScreen and
                sys.platform == 'darwin'):
            return

        dismiss_box = QCheckBox(
            _("Hide this message during the current session")
        )

        msgbox = QMessageBox(self)
        msgbox.setIcon(QMessageBox.Warning)
        msgbox.setText(
            _("A monitor scale change was detected. <br><br>"
              "We recommend restarting Spyder to ensure that it's properly "
              "displayed. If you don't want to do that, please be sure to "
              "activate the option<br><br><tt>Enable auto high DPI scaling"
              "</tt><br><br>in <tt>Preferences > General > Interface</tt>, "
              "in case Spyder is not displayed correctly.<br><br>"
              "Do you want to restart Spyder?"))
        yes_button = msgbox.addButton(QMessageBox.Yes)
        msgbox.addButton(QMessageBox.No)
        msgbox.setCheckBox(dismiss_box)
        msgbox.exec_()

        if dismiss_box.isChecked():
            self.show_dpi_message = False

        if msgbox.clickedButton() == yes_button:
            # Activate HDPI auto-scaling option since is needed for a proper
            # display when using OS scaling
            CONF.set('main', 'normal_screen_resolution', False)
            CONF.set('main', 'high_dpi_scaling', True)
            CONF.set('main', 'high_dpi_custom_scale_factor', False)
            self.restart()
        else:
            # Reconnect DPI scale changes to show a restart message
            self.screen.logicalDotsPerInchChanged.connect(
                self.show_dpi_change_message)

    def set_window_title(self):
        """Set window title."""
        if DEV is not None:
            title = u"Spyder %s (Python %s.%s)" % (__version__,
                                                   sys.version_info[0],
                                                   sys.version_info[1])
        else:
            title = u"Spyder (Python %s.%s)" % (sys.version_info[0],
                                                sys.version_info[1])

        if get_debug_level():
            title += u" [DEBUG MODE %d]" % get_debug_level()

        if self.window_title is not None:
            title += u' -- ' + to_text_string(self.window_title)

        if self.projects is not None:
            path = self.projects.get_active_project_path()
            if path:
                path = path.replace(get_home_dir(), u'~')
                title = u'{0} - {1}'.format(path, title)

        self.base_title = title
        self.setWindowTitle(self.base_title)

    def report_missing_dependencies(self):
        """Show a QMessageBox with a list of missing hard dependencies"""
        # Declare dependencies before trying to detect the missing ones
        dependencies.declare_dependencies()
        missing_deps = dependencies.missing_dependencies()

        if missing_deps:
            # We change '<br>' by '\n', in order to replace the '<'
            # that appear in our deps by '&lt' (to not break html
            # formatting) and finally we restore '<br>' again.
            missing_deps = (missing_deps.replace('<br>', '\n').
                            replace('<', '&lt;').replace('\n', '<br>'))

            QMessageBox.critical(self, _('Error'),
                _("<b>You have missing dependencies!</b>"
                  "<br><br><tt>%s</tt><br>"
                  "<b>Please install them to avoid this message.</b>"
                  "<br><br>"
                  "<i>Note</i>: Spyder could work without some of these "
                  "dependencies, however to have a smooth experience when "
                  "using Spyder we <i>strongly</i> recommend you to install "
                  "all the listed missing dependencies.<br><br>"
                  "Failing to install these dependencies might result in bugs. "
                  "Please be sure that any found bugs are not the direct "
                  "result of missing dependencies, prior to reporting a new "
                  "issue."
                  ) % missing_deps, QMessageBox.Ok)

    def load_window_settings(self, prefix, default=False, section='main'):
        """Load window layout settings from userconfig-based configuration
        with *prefix*, under *section*
        default: if True, do not restore inner layout"""
        get_func = CONF.get_default if default else CONF.get
        window_size = get_func(section, prefix+'size')
        prefs_dialog_size = get_func(section, prefix+'prefs_dialog_size')
        if default:
            hexstate = None
        else:
            hexstate = get_func(section, prefix+'state', None)

        pos = get_func(section, prefix+'position')

        # It's necessary to verify if the window/position value is valid
        # with the current screen. See spyder-ide/spyder#3748.
        width = pos[0]
        height = pos[1]
        screen_shape = QApplication.desktop().geometry()
        current_width = screen_shape.width()
        current_height = screen_shape.height()
        if current_width < width or current_height < height:
            pos = CONF.get_default(section, prefix+'position')

        is_maximized =  get_func(section, prefix+'is_maximized')
        is_fullscreen = get_func(section, prefix+'is_fullscreen')
        return hexstate, window_size, prefs_dialog_size, pos, is_maximized, \
               is_fullscreen

    def get_window_settings(self):
        """Return current window settings
        Symetric to the 'set_window_settings' setter"""
        window_size = (self.window_size.width(), self.window_size.height())
        is_fullscreen = self.isFullScreen()
        if is_fullscreen:
            is_maximized = self.maximized_flag
        else:
            is_maximized = self.isMaximized()
        pos = (self.window_position.x(), self.window_position.y())
        prefs_dialog_size = (self.prefs_dialog_size.width(),
                             self.prefs_dialog_size.height())
        hexstate = qbytearray_to_str(self.saveState())
        return (hexstate, window_size, prefs_dialog_size, pos, is_maximized,
                is_fullscreen)

    def set_window_settings(self, hexstate, window_size, prefs_dialog_size,
                            pos, is_maximized, is_fullscreen):
        """Set window settings
        Symetric to the 'get_window_settings' accessor"""
        self.setUpdatesEnabled(False)
        self.window_size = QSize(window_size[0], window_size[1]) # width,height
        self.prefs_dialog_size = QSize(prefs_dialog_size[0],
                                       prefs_dialog_size[1]) # width,height
        self.window_position = QPoint(pos[0], pos[1]) # x,y
        self.setWindowState(Qt.WindowNoState)
        self.resize(self.window_size)
        self.move(self.window_position)

        # Window layout
        if hexstate:
            self.restoreState( QByteArray().fromHex(
                    str(hexstate).encode('utf-8')) )
            # Workaround for spyder-ide/spyder#880.
            # QDockWidget objects are not painted if restored as floating
            # windows, so we must dock them before showing the mainwindow.
            for widget in self.children():
                if isinstance(widget, QDockWidget) and widget.isFloating():
                    self.floating_dockwidgets.append(widget)
                    widget.setFloating(False)

        # Is fullscreen?
        if is_fullscreen:
            self.setWindowState(Qt.WindowFullScreen)
        self.__update_fullscreen_action()

        # Is maximized?
        if is_fullscreen:
            self.maximized_flag = is_maximized
        elif is_maximized:
            self.setWindowState(Qt.WindowMaximized)
        self.setUpdatesEnabled(True)

    def save_current_window_settings(self, prefix, section='main',
                                     none_state=False):
        """Save current window settings with *prefix* in
        the userconfig-based configuration, under *section*"""
        win_size = self.window_size
        prefs_size = self.prefs_dialog_size

        CONF.set(section, prefix+'size', (win_size.width(), win_size.height()))
        CONF.set(section, prefix+'prefs_dialog_size',
                 (prefs_size.width(), prefs_size.height()))
        CONF.set(section, prefix+'is_maximized', self.isMaximized())
        CONF.set(section, prefix+'is_fullscreen', self.isFullScreen())
        pos = self.window_position
        CONF.set(section, prefix+'position', (pos.x(), pos.y()))
        self.maximize_dockwidget(restore=True)# Restore non-maximized layout
        if none_state:
            CONF.set(section, prefix + 'state', None)
        else:
            qba = self.saveState()
            CONF.set(section, prefix + 'state', qbytearray_to_str(qba))
        CONF.set(section, prefix+'statusbar',
                    not self.statusBar().isHidden())

    def tabify_plugins(self, first, second):
        """Tabify plugin dockwigdets"""
        self.tabifyDockWidget(first.dockwidget, second.dockwidget)

    # --- Layouts
    def setup_layout(self, default=False):
        """Setup window layout"""
        prefix = 'window' + '/'
        settings = self.load_window_settings(prefix, default)
        hexstate = settings[0]

        self.first_spyder_run = False
        if hexstate is None:
            # First Spyder execution:
            self.setWindowState(Qt.WindowMaximized)
            self.first_spyder_run = True
            self.setup_default_layouts('default', settings)

            # Now that the initial setup is done, copy the window settings,
            # except for the hexstate in the quick layouts sections for the
            # default layouts.
            # Order and name of the default layouts is found in config.py
            section = 'quick_layouts'
            get_func = CONF.get_default if default else CONF.get
            order = get_func(section, 'order')

            # restore the original defaults if reset layouts is called
            if default:
                CONF.set(section, 'active', order)
                CONF.set(section, 'order', order)
                CONF.set(section, 'names', order)

            for index, name, in enumerate(order):
                prefix = 'layout_{0}/'.format(index)
                self.save_current_window_settings(prefix, section,
                                                  none_state=True)

            # store the initial layout as the default in spyder
            prefix = 'layout_default/'
            section = 'quick_layouts'
            self.save_current_window_settings(prefix, section, none_state=True)
            self.current_quick_layout = 'default'

            # Regenerate menu
            self.quick_layout_set_menu()
        self.set_window_settings(*settings)

        for plugin in (self.widgetlist + self.thirdparty_plugins):
            try:
                plugin._initialize_plugin_in_mainwindow_layout()
            except Exception as error:
                print("%s: %s" % (plugin, str(error)), file=STDERR)
                traceback.print_exc(file=STDERR)

    def setup_default_layouts(self, index, settings):
        """Setup default layouts when run for the first time."""
        self.setUpdatesEnabled(False)

        first_spyder_run = bool(self.first_spyder_run)  # Store copy

        if first_spyder_run:
            self.set_window_settings(*settings)
        else:
            if self.last_plugin:
                if self.last_plugin._ismaximized:
                    self.maximize_dockwidget(restore=True)

            if not (self.isMaximized() or self.maximized_flag):
                self.showMaximized()

            min_width = self.minimumWidth()
            max_width = self.maximumWidth()
            base_width = self.width()
            self.setFixedWidth(base_width)

        # IMPORTANT: order has to be the same as defined in the config file
        MATLAB, RSTUDIO, VERTICAL, HORIZONTAL = range(self.DEFAULT_LAYOUTS)

        # Define widgets locally
        editor = self.editor
        console_ipy = self.ipyconsole
        console_int = self.console
        outline = self.outlineexplorer
        explorer_project = self.projects
        explorer_file = self.explorer
        explorer_variable = self.variableexplorer
        plots = self.plots
        history = self.historylog
        finder = self.findinfiles
        help_plugin = self.help
        helper = self.onlinehelp
        plugins = self.thirdparty_plugins

        # Stored for tests
        global_hidden_widgets = [finder, console_int, explorer_project,
                                 helper] + plugins
        global_hidden_toolbars = [self.source_toolbar, self.edit_toolbar,
                                  self.search_toolbar]
        # Layout definition
        # --------------------------------------------------------------------
        # Layouts are organized by columns, each column is organized by rows.
        # Widths have to accumulate to 100 (except if hidden), height per
        # column has to accumulate to 100 as well

        # Spyder Default Initial Layout
        s_layout = {
            'widgets': [
                # Column 0
                [[explorer_project]],
                # Column 1
                [[editor]],
                # Column 2
                [[outline]],
                # Column 3
                [[help_plugin, explorer_variable, plots,     # Row 0
                  helper, explorer_file, finder] + plugins,
                 [console_int, console_ipy, history]]        # Row 1
                ],
            'width fraction': [15,            # Column 0 width
                               45,            # Column 1 width
                                5,            # Column 2 width
                               45],           # Column 3 width
            'height fraction': [[100],          # Column 0, row heights
                                [100],          # Column 1, row heights
                                [100],          # Column 2, row heights
                                [46, 54]],  # Column 3, row heights
            'hidden widgets': [outline] + global_hidden_widgets,
            'hidden toolbars': [],
        }

        # RStudio
        r_layout = {
            'widgets': [
                # column 0
                [[editor],                            # Row 0
                 [console_ipy, console_int]],         # Row 1
                # column 1
                [[explorer_variable, plots, history,  # Row 0
                  outline, finder] + plugins,
                 [explorer_file, explorer_project,    # Row 1
                  help_plugin, helper]]
                ],
            'width fraction': [55,            # Column 0 width
                               45],           # Column 1 width
            'height fraction': [[55, 45],   # Column 0, row heights
                                [55, 45]],  # Column 1, row heights
            'hidden widgets': [outline] + global_hidden_widgets,
            'hidden toolbars': [],
        }

        # Matlab
        m_layout = {
            'widgets': [
                # column 0
                [[explorer_file, explorer_project],
                 [outline]],
                # column 1
                [[editor],
                 [console_ipy, console_int]],
                # column 2
                [[explorer_variable, plots, finder] + plugins,
                 [history, help_plugin, helper]]
                ],
            'width fraction': [10,            # Column 0 width
                               45,            # Column 1 width
                               45],           # Column 2 width
            'height fraction': [[55, 45],   # Column 0, row heights
                                [55, 45],   # Column 1, row heights
                                [55, 45]],  # Column 2, row heights
            'hidden widgets': global_hidden_widgets,
            'hidden toolbars': [],
        }

        # Vertically split
        v_layout = {
            'widgets': [
                # column 0
                [[editor],                                  # Row 0
                 [console_ipy, console_int, explorer_file,  # Row 1
                  explorer_project, help_plugin, explorer_variable, plots,
                  history, outline, finder, helper] + plugins]
                ],
            'width fraction': [100],            # Column 0 width
            'height fraction': [[55, 45]],  # Column 0, row heights
            'hidden widgets': [outline] + global_hidden_widgets,
            'hidden toolbars': [],
        }

        # Horizontally split
        h_layout = {
            'widgets': [
                # column 0
                [[editor]],                                 # Row 0
                # column 1
                [[console_ipy, console_int, explorer_file,  # Row 0
                  explorer_project, help_plugin, explorer_variable, plots,
                  history, outline, finder, helper] + plugins]
                ],
            'width fraction': [55,      # Column 0 width
                               45],     # Column 1 width
            'height fraction': [[100],    # Column 0, row heights
                                [100]],   # Column 1, row heights
            'hidden widgets': [outline] + global_hidden_widgets,
            'hidden toolbars': []
        }

        # Layout selection
        layouts = {
            'default': s_layout,
            RSTUDIO: r_layout,
            MATLAB: m_layout,
            VERTICAL: v_layout,
            HORIZONTAL: h_layout,
        }

        layout = layouts[index]

        # Remove None from widgets layout
        widgets_layout = layout['widgets']
        widgets_layout_clean = []
        for column in widgets_layout:
            clean_col = []
            for row in column:
                clean_row = [w for w in row if w is not None]
                if clean_row:
                    clean_col.append(clean_row)
            if clean_col:
                widgets_layout_clean.append(clean_col)

        # Flatten widgets list
        widgets = []
        for column in widgets_layout_clean:
            for row in column:
                for widget in row:
                    widgets.append(widget)

        # Make every widget visible
        for widget in widgets:
            widget.toggle_view(True)
            if widget._toggle_view_action:
                widget._toggle_view_action.setChecked(True)

        # We use both directions to ensure proper update when moving from
        # 'Horizontal Split' to 'Spyder Default'
        # This also seems to help on random cases where the display seems
        # 'empty'
        for direction in (Qt.Vertical, Qt.Horizontal):
            # Arrange the widgets in one direction
            for idx in range(len(widgets) - 1):
                first, second = widgets[idx], widgets[idx+1]
                if first is not None and second is not None:
                    self.splitDockWidget(first.dockwidget, second.dockwidget,
                                         direction)

        # Arrange the widgets in the other direction
        for column in widgets_layout_clean:
            for idx in range(len(column) - 1):
                first_row, second_row = column[idx], column[idx+1]
                self.splitDockWidget(first_row[0].dockwidget,
                                     second_row[0].dockwidget,
                                     Qt.Vertical)

        # Tabify
        for column in widgets_layout_clean:
            for row in column:
                for idx in range(len(row) - 1):
                    first, second = row[idx], row[idx+1]
                    self.tabify_plugins(first, second)

                # Raise front widget per row
                row[0].dockwidget.show()
                row[0].dockwidget.raise_()

        # Set dockwidget widths
        width_fractions = layout['width fraction']
        if len(width_fractions) > 1:
            _widgets = [col[0][0].dockwidget for col in widgets_layout]
            self.resizeDocks(_widgets, width_fractions, Qt.Horizontal)

        # Set dockwidget heights
        height_fractions = layout['height fraction']
        for idx, column in enumerate(widgets_layout_clean):
            if len(column) > 1:
                _widgets = [row[0].dockwidget for row in column]
                self.resizeDocks(_widgets, height_fractions[idx], Qt.Vertical)

        # Hide toolbars
        hidden_toolbars = global_hidden_toolbars + layout['hidden toolbars']
        for toolbar in hidden_toolbars:
            if toolbar is not None:
                toolbar.close()

        # Hide widgets
        hidden_widgets = layout['hidden widgets']
        for widget in hidden_widgets:
            if widget is not None:
                widget.dockwidget.close()

        if first_spyder_run:
            self.first_spyder_run = False
        else:
            self.setMinimumWidth(min_width)
            self.setMaximumWidth(max_width)

            if not (self.isMaximized() or self.maximized_flag):
                self.showMaximized()

        self.setUpdatesEnabled(True)
        self.sig_layout_setup_ready.emit(layout)

        return layout

    @Slot()
    def toggle_previous_layout(self):
        """ """
        self.toggle_layout('previous')

    @Slot()
    def toggle_next_layout(self):
        """ """
        self.toggle_layout('next')

    def toggle_layout(self, direction='next'):
        """ """
        get = CONF.get
        names = get('quick_layouts', 'names')
        order = get('quick_layouts', 'order')
        active = get('quick_layouts', 'active')

        if len(active) == 0:
            return

        layout_index = ['default']
        for name in order:
            if name in active:
                layout_index.append(names.index(name))

        current_layout = self.current_quick_layout
        dic = {'next': 1, 'previous': -1}

        if current_layout is None:
            # Start from default
            current_layout = 'default'

        if current_layout in layout_index:
            current_index = layout_index.index(current_layout)
        else:
            current_index = 0

        new_index = (current_index + dic[direction]) % len(layout_index)
        self.quick_layout_switch(layout_index[new_index])

    def quick_layout_set_menu(self):
        """ """
        get = CONF.get
        names = get('quick_layouts', 'names')
        order = get('quick_layouts', 'order')
        active = get('quick_layouts', 'active')

        ql_actions = []

        ql_actions = [create_action(self, _('Spyder Default Layout'),
                                    triggered=lambda:
                                    self.quick_layout_switch('default'))]
        for name in order:
            if name in active:
                index = names.index(name)

                # closure required so lambda works with the default parameter
                def trigger(i=index, self=self):
                    return lambda: self.quick_layout_switch(i)

                qli_act = create_action(self, name, triggered=trigger())
                # closure above replaces the following which stopped working
                # qli_act = create_action(self, name, triggered=lambda i=index:
                #     self.quick_layout_switch(i)

                ql_actions += [qli_act]

        self.ql_save = create_action(self, _("Save current layout"),
                                     triggered=lambda:
                                     self.quick_layout_save(),
                                     context=Qt.ApplicationShortcut)
        self.ql_preferences = create_action(self, _("Layout preferences"),
                                            triggered=lambda:
                                            self.quick_layout_settings(),
                                            context=Qt.ApplicationShortcut)
        self.ql_reset = create_action(self, _('Reset to spyder default'),
                                      triggered=self.reset_window_layout)

        self.register_shortcut(self.ql_save, "_", "Save current layout")
        self.register_shortcut(self.ql_preferences, "_", "Layout preferences")

        ql_actions += [None]
        ql_actions += [self.ql_save, self.ql_preferences, self.ql_reset]

        self.quick_layout_menu.clear()
        add_actions(self.quick_layout_menu, ql_actions)

        if len(order) == 0:
            self.ql_preferences.setEnabled(False)
        else:
            self.ql_preferences.setEnabled(True)

    @Slot()
    def reset_window_layout(self):
        """Reset window layout to default"""
        answer = QMessageBox.warning(self, _("Warning"),
                     _("Window layout will be reset to default settings: "
                       "this affects window position, size and dockwidgets.\n"
                       "Do you want to continue?"),
                     QMessageBox.Yes | QMessageBox.No)
        if answer == QMessageBox.Yes:
            self.setup_layout(default=True)

    def quick_layout_save(self):
        """Save layout dialog"""
        get = CONF.get
        set_ = CONF.set
        names = get('quick_layouts', 'names')
        order = get('quick_layouts', 'order')
        active = get('quick_layouts', 'active')

        dlg = self.dialog_layout_save(self, names)

        if dlg.exec_():
            name = dlg.combo_box.currentText()

            if name in names:
                answer = QMessageBox.warning(self, _("Warning"),
                                             _("Layout <b>%s</b> will be \
                                               overwritten. Do you want to \
                                               continue?") % name,
                                             QMessageBox.Yes | QMessageBox.No)
                index = order.index(name)
            else:
                answer = True
                if None in names:
                    index = names.index(None)
                    names[index] = name
                else:
                    index = len(names)
                    names.append(name)
                order.append(name)

            # Always make active a new layout even if it overwrites an inactive
            # layout
            if name not in active:
                active.append(name)

            if answer:
                self.save_current_window_settings('layout_{}/'.format(index),
                                                  section='quick_layouts')
                set_('quick_layouts', 'names', names)
                set_('quick_layouts', 'order', order)
                set_('quick_layouts', 'active', active)
                self.quick_layout_set_menu()

    def quick_layout_settings(self):
        """Layout settings dialog"""
        get = CONF.get
        set_ = CONF.set

        section = 'quick_layouts'

        names = get(section, 'names')
        order = get(section, 'order')
        active = get(section, 'active')

        dlg = self.dialog_layout_settings(self, names, order, active)
        if dlg.exec_():
            set_(section, 'names', dlg.names)
            set_(section, 'order', dlg.order)
            set_(section, 'active', dlg.active)
            self.quick_layout_set_menu()

    def quick_layout_switch(self, index):
        """Switch to quick layout number *index*"""
        section = 'quick_layouts'

        try:
            settings = self.load_window_settings('layout_{}/'.format(index),
                                                 section=section)
            (hexstate, window_size, prefs_dialog_size, pos, is_maximized,
             is_fullscreen) = settings

            # The defaults layouts will always be regenerated unless there was
            # an overwrite, either by rewriting with same name, or by deleting
            # and then creating a new one
            if hexstate is None:
                # The value for hexstate shouldn't be None for a custom saved
                # layout (ie, where the index is greater than the number of
                # defaults).  See spyder-ide/spyder#6202.
                if index != 'default' and index >= self.DEFAULT_LAYOUTS:
                    QMessageBox.critical(
                            self, _("Warning"),
                            _("Error opening the custom layout.  Please close"
                              " Spyder and try again.  If the issue persists,"
                              " then you must use 'Reset to Spyder default' "
                              "from the layout menu."))
                    return
                self.setup_default_layouts(index, settings)
        except cp.NoOptionError:
            QMessageBox.critical(self, _("Warning"),
                                 _("Quick switch layout #%s has not yet "
                                   "been defined.") % str(index))
            return
            # TODO: is there any real use in calling the previous layout
            # setting?
            # self.previous_layout_settings = self.get_window_settings()
        self.set_window_settings(*settings)
        self.current_quick_layout = index

        # make sure the flags are correctly set for visible panes
        for plugin in (self.widgetlist + self.thirdparty_plugins):
            action = plugin._toggle_view_action
            try:
                action.setChecked(plugin.dockwidget.isVisible())
            except:
                pass

    # --- Show/Hide toolbars
    def _update_show_toolbars_action(self):
        """Update the text displayed in the menu entry."""
        if self.toolbars_visible:
            text = _("Hide toolbars")
            tip = _("Hide toolbars")
        else:
            text = _("Show toolbars")
            tip = _("Show toolbars")
        self.show_toolbars_action.setText(text)
        self.show_toolbars_action.setToolTip(tip)

    def save_visible_toolbars(self):
        """Saves the name of the visible toolbars in the .ini file."""
        toolbars = []
        for toolbar in self.visible_toolbars:
            toolbars.append(toolbar.objectName())
        CONF.set('main', 'last_visible_toolbars', toolbars)

    def get_visible_toolbars(self):
        """Collects the visible toolbars."""
        toolbars = []
        for toolbar in self.toolbarslist:
            if toolbar.toggleViewAction().isChecked():
                toolbars.append(toolbar)
        self.visible_toolbars = toolbars

    def load_last_visible_toolbars(self):
        """Loads the last visible toolbars from the .ini file."""
        toolbars_names = CONF.get('main', 'last_visible_toolbars', default=[])

        if toolbars_names:
            dic = {}
            for toolbar in self.toolbarslist:
                dic[toolbar.objectName()] = toolbar

            toolbars = []
            for name in toolbars_names:
                if name in dic:
                    toolbars.append(dic[name])
            self.visible_toolbars = toolbars
        else:
            self.get_visible_toolbars()
        self._update_show_toolbars_action()

    @Slot()
    def show_toolbars(self):
        """Show/Hides toolbars."""
        value = not self.toolbars_visible
        CONF.set('main', 'toolbars_visible', value)
        if value:
            self.save_visible_toolbars()
        else:
            self.get_visible_toolbars()

        for toolbar in self.visible_toolbars:
            toolbar.toggleViewAction().setChecked(value)
            toolbar.setVisible(value)

        self.toolbars_visible = value
        self._update_show_toolbars_action()

    # --- Other
    def update_execution_state_kernel(self):
        """Handle execution state of the current console."""
        try:
            self.ipyconsole.update_execution_state_kernel()
        except AttributeError:
            return

    def valid_project(self):
        """Handle an invalid active project."""
        try:
            path = self.projects.get_active_project_path()
        except AttributeError:
            return

        if bool(path):
            if not self.projects.is_valid_project(path):
                if path:
                    QMessageBox.critical(
                        self,
                        _('Error'),
                        _("<b>{}</b> is no longer a valid Spyder project! "
                          "Since it is the current active project, it will "
                          "be closed automatically.").format(path))
                self.projects.close_project()

    def free_memory(self):
        """Free memory after event."""
        gc.collect()

    def plugin_focus_changed(self):
        """Focus has changed from one plugin to another"""
        self.update_edit_menu()
        self.update_search_menu()

    def show_shortcuts(self, menu):
        """Show action shortcuts in menu."""
        menu_actions = menu.actions()
        for action in menu_actions:
            if getattr(action, '_shown_shortcut', False):
                # This is a SpyderAction
                if action._shown_shortcut is not None:
                    action.setShortcut(action._shown_shortcut)
            elif action.menu() is not None:
                # This is submenu, so we need to call this again
                self.show_shortcuts(action.menu())
            else:
                # We don't need to do anything for other elements
                continue

    def hide_shortcuts(self, menu):
        """Hide action shortcuts in menu."""
        menu_actions = menu.actions()
        for action in menu_actions:
            if getattr(action, '_shown_shortcut', False):
                # This is a SpyderAction
                if action._shown_shortcut is not None:
                    action.setShortcut(QKeySequence())
            elif action.menu() is not None:
                # This is submenu, so we need to call this again
                self.hide_shortcuts(action.menu())
            else:
                # We don't need to do anything for other elements
                continue

    def hide_options_menus(self):
        """Hide options menu when menubar is pressed in macOS."""
        for plugin in self.widgetlist + self.thirdparty_plugins:
            if plugin.CONF_SECTION == 'editor':
                editorstack = self.editor.get_current_editorstack()
                editorstack.menu.hide()
            else:
                plugin._options_menu.hide()

    def get_focus_widget_properties(self):
        """Get properties of focus widget
        Returns tuple (widget, properties) where properties is a tuple of
        booleans: (is_console, not_readonly, readwrite_editor)"""
        from spyder.plugins.editor.widgets.editor import TextEditBaseWidget
        from spyder.plugins.ipythonconsole.widgets import ControlWidget
        widget = QApplication.focusWidget()

        textedit_properties = None
        if isinstance(widget, (TextEditBaseWidget, ControlWidget)):
            console = isinstance(widget, ControlWidget)
            not_readonly = not widget.isReadOnly()
            readwrite_editor = not_readonly and not console
            textedit_properties = (console, not_readonly, readwrite_editor)
        return widget, textedit_properties

    def update_edit_menu(self):
        """Update edit menu"""
        widget, textedit_properties = self.get_focus_widget_properties()
        if textedit_properties is None: # widget is not an editor/console
            return
        # !!! Below this line, widget is expected to be a QPlainTextEdit
        #     instance
        console, not_readonly, readwrite_editor = textedit_properties

        # Editor has focus and there is no file opened in it
        if (not console and not_readonly and self.editor
                and not self.editor.is_file_opened()):
            return

        # Disabling all actions to begin with
        for child in self.edit_menu.actions():
            child.setEnabled(False)

        self.selectall_action.setEnabled(True)

        # Undo, redo
        self.undo_action.setEnabled( readwrite_editor \
                                     and widget.document().isUndoAvailable() )
        self.redo_action.setEnabled( readwrite_editor \
                                     and widget.document().isRedoAvailable() )

        # Copy, cut, paste, delete
        has_selection = widget.has_selected_text()
        self.copy_action.setEnabled(has_selection)
        self.cut_action.setEnabled(has_selection and not_readonly)
        self.paste_action.setEnabled(not_readonly)

        # Comment, uncomment, indent, unindent...
        if not console and not_readonly:
            # This is the editor and current file is writable
            if self.editor:
                for action in self.editor.edit_menu_actions:
                    action.setEnabled(True)

    def update_search_menu(self):
        """Update search menu"""
        # Disabling all actions except the last one
        # (which is Find in files) to begin with
        for child in self.search_menu.actions()[:-1]:
            child.setEnabled(False)

        widget, textedit_properties = self.get_focus_widget_properties()
        if textedit_properties is None: # widget is not an editor/console
            return

        # !!! Below this line, widget is expected to be a QPlainTextEdit
        #     instance
        console, not_readonly, readwrite_editor = textedit_properties

        # Find actions only trigger an effect in the Editor
        if not console:
            for action in self.search_menu.actions():
                try:
                    action.setEnabled(True)
                except RuntimeError:
                    pass

        # Disable the replace action for read-only files
        if len(self.search_menu_actions) > 3:
            self.search_menu_actions[3].setEnabled(readwrite_editor)

    def create_plugins_menu(self):
        order = ['editor', 'ipython_console', 'variable_explorer',
                 'help', 'plots', None, 'explorer', 'outline_explorer',
                 'project_explorer', 'find_in_files', None, 'historylog',
                 'profiler', 'breakpoints', 'pylint', None,
                 'onlinehelp', 'internal_console', None]
        for plugin in self.widgetlist:
            action = plugin._toggle_view_action
            action.setChecked(plugin.dockwidget.isVisible())
            try:
                name = plugin.CONF_SECTION
                pos = order.index(name)
            except ValueError:
                pos = None
            if pos is not None:
                order[pos] = action
            else:
                order.append(action)
        actions = order[:]
        for action in order:
            if type(action) is str:
                actions.remove(action)
        self.plugins_menu_actions = actions
        add_actions(self.plugins_menu, actions)

    def create_toolbars_menu(self):
        order = ['file_toolbar', 'run_toolbar', 'debug_toolbar',
                 'main_toolbar', 'Global working directory', None,
                 'search_toolbar', 'edit_toolbar', 'source_toolbar']
        for toolbar in self.toolbarslist:
            action = toolbar.toggleViewAction()
            name = toolbar.objectName()
            try:
                pos = order.index(name)
            except ValueError:
                pos = None
            if pos is not None:
                order[pos] = action
            else:
                order.append(action)
        add_actions(self.toolbars_menu, order)

    def createPopupMenu(self):
        menu = QMenu('', self)
        actions = self.help_menu_actions[:3] + \
                    [None, self.help_menu_actions[-1]]
        add_actions(menu, actions)
        return menu

    def set_splash(self, message):
        """Set splash message"""
        if self.splash is None:
            return
        if message:
            logger.info(message)
        self.splash.show()
        self.splash.showMessage(message,
                                int(Qt.AlignBottom | Qt.AlignCenter |
                                    Qt.AlignAbsolute),
                                QColor(Qt.black))
        QApplication.processEvents()

    def closeEvent(self, event):
        """closeEvent reimplementation"""
        if self.closing(True):
            event.accept()
        else:
            event.ignore()

    def resizeEvent(self, event):
        """Reimplement Qt method"""
        if not self.isMaximized() and not self.fullscreen_flag:
            self.window_size = self.size()
        QMainWindow.resizeEvent(self, event)

        # To be used by the tour to be able to resize
        self.sig_resized.emit(event)

    def moveEvent(self, event):
        """Reimplement Qt method"""
        if not self.isMaximized() and not self.fullscreen_flag:
            self.window_position = self.pos()
        QMainWindow.moveEvent(self, event)

        # To be used by the tour to be able to move
        self.sig_moved.emit(event)

    def hideEvent(self, event):
        """Reimplement Qt method"""
        try:
            for plugin in (self.widgetlist + self.thirdparty_plugins):
                if plugin.isAncestorOf(self.last_focused_widget):
                    plugin._visibility_changed(True)
            QMainWindow.hideEvent(self, event)
        except RuntimeError:
            QMainWindow.hideEvent(self, event)

    def change_last_focused_widget(self, old, now):
        """To keep track of to the last focused widget"""
        if (now is None and QApplication.activeWindow() is not None):
            QApplication.activeWindow().setFocus()
            self.last_focused_widget = QApplication.focusWidget()
        elif now is not None:
            self.last_focused_widget = now

        self.previous_focused_widget =  old

    def closing(self, cancelable=False):
        """Exit tasks"""
        if self.already_closed or self.is_starting_up:
            return True

        if cancelable and CONF.get('main', 'prompt_on_exit'):
            reply = QMessageBox.critical(self, 'Spyder',
                                         'Do you really want to exit?',
                                         QMessageBox.Yes, QMessageBox.No)
            if reply == QMessageBox.No:
                return False

        if CONF.get('main', 'single_instance') and self.open_files_server:
            self.open_files_server.close()

        if not self.completions.closing_plugin(cancelable):
            return False

        for plugin in (self.widgetlist + self.thirdparty_plugins):
            plugin._close_window()
            if not plugin.closing_plugin(cancelable):
                return False

        # Save window settings *after* closing all plugin windows, in order
        # to show them in their previous locations in the next session.
        # Fixes spyder-ide/spyder#12139
        prefix = 'window' + '/'
        self.save_current_window_settings(prefix)

        self.dialog_manager.close_all()

        if self.toolbars_visible:
            self.save_visible_toolbars()

        self.completions.shutdown()

        self.already_closed = True
        return True

    def add_dockwidget(self, plugin):
        """Add a plugin QDockWidget to the window."""
        if plugin._is_compatible:
            dockwidget, location = plugin._create_dockwidget()
            if CONF.get('main', 'vertical_dockwidget_titlebars'):
                dockwidget.setFeatures(dockwidget.features()|
                                       QDockWidget.DockWidgetVerticalTitleBar)
            self.addDockWidget(location, dockwidget)
            self.widgetlist.append(plugin)

    @Slot()
    def close_current_dockwidget(self):
        widget = QApplication.focusWidget()
        for plugin in (self.widgetlist + self.thirdparty_plugins):
            if plugin.isAncestorOf(widget):
                plugin._toggle_view_action.setChecked(False)
                break

    def toggle_lock(self, value):
        """Lock/Unlock dockwidgets and toolbars"""
        self.interface_locked = value
        CONF.set('main', 'panes_locked', value)

        # Apply lock to panes
        for plugin in (self.widgetlist + self.thirdparty_plugins):
            if self.interface_locked:
                if plugin.dockwidget.isFloating():
                    plugin.dockwidget.setFloating(False)

                plugin.dockwidget.remove_title_bar()
            else:
                plugin.dockwidget.set_title_bar()

        # Apply lock to toolbars
        for toolbar in self.toolbarslist:
            if self.interface_locked:
                toolbar.setMovable(False)
            else:
                toolbar.setMovable(True)

    def __update_maximize_action(self):
        if self.state_before_maximizing is None:
            text = _("Maximize current pane")
            tip = _("Maximize current pane")
            icon = ima.icon('maximize')
        else:
            text = _("Restore current pane")
            tip = _("Restore pane to its original size")
            icon = ima.icon('unmaximize')
        self.maximize_action.setText(text)
        self.maximize_action.setIcon(icon)
        self.maximize_action.setToolTip(tip)

    @Slot()
    @Slot(bool)
    def maximize_dockwidget(self, restore=False):
        """Shortcut: Ctrl+Alt+Shift+M
        First call: maximize current dockwidget
        Second call (or restore=True): restore original window layout"""
        if self.state_before_maximizing is None:
            if restore:
                return

            # Select plugin to maximize
            self.state_before_maximizing = self.saveState()
            focus_widget = QApplication.focusWidget()
            for plugin in (self.widgetlist + self.thirdparty_plugins):
                plugin.dockwidget.hide()
                if plugin.isAncestorOf(focus_widget):
                    self.last_plugin = plugin

            # Only plugins that have a dockwidget are part of widgetlist,
            # so last_plugin can be None after the above "for" cycle.
            # For example, this happens if, after Spyder has started, focus
            # is set to the Working directory toolbar (which doesn't have
            # a dockwidget) and then you press the Maximize button
            if self.last_plugin is None:
                # Using the Editor as default plugin to maximize
                self.last_plugin = self.editor

            # Maximize last_plugin
            self.last_plugin.dockwidget.toggleViewAction().setDisabled(True)
            self.setCentralWidget(self.last_plugin)
            self.last_plugin._ismaximized = True

            # Workaround to solve an issue with editor's outline explorer:
            # (otherwise the whole plugin is hidden and so is the outline explorer
            #  and the latter won't be refreshed if not visible)
            self.last_plugin.show()
            self.last_plugin._visibility_changed(True)
            if self.last_plugin is self.editor:
                # Automatically show the outline if the editor was maximized:
                self.addDockWidget(Qt.RightDockWidgetArea,
                                   self.outlineexplorer.dockwidget)
                self.outlineexplorer.dockwidget.show()
        else:
            # Restore original layout (before maximizing current dockwidget)
            self.last_plugin.dockwidget.setWidget(self.last_plugin)
            self.last_plugin.dockwidget.toggleViewAction().setEnabled(True)
            self.setCentralWidget(None)
            self.last_plugin._ismaximized = False
            self.restoreState(self.state_before_maximizing)
            self.state_before_maximizing = None
            self.last_plugin.get_focus_widget().setFocus()
        self.__update_maximize_action()

    def __update_fullscreen_action(self):
        if self.fullscreen_flag:
            icon = ima.icon('window_nofullscreen')
        else:
            icon = ima.icon('window_fullscreen')
        if is_text_string(icon):
            icon = get_icon(icon)
        self.fullscreen_action.setIcon(icon)

    @Slot()
    def toggle_fullscreen(self):
        if self.fullscreen_flag:
            self.fullscreen_flag = False
            if os.name == 'nt':
                self.setWindowFlags(
                    self.windowFlags()
                    ^ (Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint))
                self.setGeometry(self.saved_normal_geometry)
            self.showNormal()
            if self.maximized_flag:
                self.showMaximized()
        else:
            self.maximized_flag = self.isMaximized()
            self.fullscreen_flag = True
            self.saved_normal_geometry = self.normalGeometry()
            if os.name == 'nt':
                # Due to limitations of the Windows DWM, compositing is not
                # handled correctly for OpenGL based windows when going into
                # full screen mode, so we need to use this workaround.
                # See spyder-ide/spyder#4291.
                self.setWindowFlags(self.windowFlags()
                                    | Qt.FramelessWindowHint
                                    | Qt.WindowStaysOnTopHint)

                screen_number = QDesktopWidget().screenNumber(self)
                if screen_number < 0:
                    screen_number = 0

                r = QApplication.desktop().screenGeometry(screen_number)
                self.setGeometry(
                    r.left() - 1, r.top() - 1, r.width() + 2, r.height() + 2)
                self.showNormal()
            else:
                self.showFullScreen()
        self.__update_fullscreen_action()

    def add_to_toolbar(self, toolbar, widget):
        """Add widget actions to toolbar"""
        actions = widget.toolbar_actions
        if actions is not None:
            add_actions(toolbar, actions)

    @Slot()
    def about(self):
        """Create About Spyder dialog with general information."""
        versions = get_versions()
        # Show Git revision for development version
        revlink = ''
        if versions['revision']:
            rev = versions['revision']
            revlink = " (<a href='https://github.com/spyder-ide/spyder/"\
                      "commit/%s'>Commit: %s</a>)" % (rev, rev)

        # Get current font properties
        font = self.font()
        font_family = font.family()
        font_size = font.pointSize()
        if sys.platform == 'darwin':
            font_size -= 2

        msgBox = QMessageBox(self)
        msgBox.setText(
            """
            <div style='font-family: "{font_family}";
                        font-size: {font_size}pt;
                        font-weight: normal;
                        '>
            <p>
            <b>Spyder {spyder_ver}</b> {revision}
            <br>
            The Scientific Python Development Environment |
            <a href="{website_url}">Spyder-IDE.org</a>
            <br>
            Copyright &copy; 2009-2019 Spyder Project Contributors and
            <a href="{github_url}/blob/master/AUTHORS.txt">others</a>.
            <br>
            Distributed under the terms of the
            <a href="{github_url}/blob/master/LICENSE.txt">MIT License</a>.
            </p>
            <p>
            Created by Pierre Raybaut; current maintainer is Carlos Cordoba.
            Developed by the
            <a href="{github_url}/graphs/contributors">international
            Spyder community</a>. Many thanks to all the Spyder beta testers
            and dedicated users.
            </p>
            <p>For help with Spyder errors and crashes, please read our
            <a href="{trouble_url}">Troubleshooting Guide</a>, and for bug
            reports and feature requests, visit our
            <a href="{github_url}">Github site</a>. For project discussion,
            see our <a href="{forum_url}">Google Group</a>.
            </p>
            <p>
            This project is part of a larger effort to promote and
            facilitate the use of Python for scientific and engineering
            software development.
            The popular Python distributions
            <a href="https://www.anaconda.com/download/">Anaconda</a> and
            <a href="https://winpython.github.io/">WinPython</a>
            also contribute to this plan.
            </p>
            <p>
            Python {python_ver} {bitness}-bit | Qt {qt_ver} |
            {qt_api} {qt_api_ver} | {os_name} {os_ver}
            </p>
            <p><small>Certain source files under other compatible permissive
            licenses and/or originally by other authors.
            Spyder 3 theme icons derived from
            <a href="https://fontawesome.com/">Font Awesome</a> 4.7
            (&copy; 2016 David Gandy; SIL OFL 1.1) and
            <a href="http://materialdesignicons.com/">Material Design</a>
            (&copy; 2014 Austin Andrews; SIL OFL 1.1).
            Most Spyder 2 theme icons sourced from the
            <a href="https://www.everaldo.com">Crystal Project iconset</a>
            (&copy; 2006-2007 Everaldo Coelho; LGPL 2.1+).
            Other icons from
            <a href="http://p.yusukekamiyamane.com/">Yusuke Kamiyamane</a>
            (&copy; 2013 Yusuke Kamiyamane; CC-BY 3.0),
            the <a href="http://www.famfamfam.com/lab/icons/silk/">FamFamFam
            Silk icon set</a> 1.3 (&copy; 2006 Mark James; CC-BY 2.5), and
            the <a href="https://www.kde.org/">KDE Oxygen icons</a>
            (&copy; 2007 KDE Artists; LGPL 3.0+).</small>
            </p>
            <p>
            See the <a href="{github_url}/blob/master/NOTICE.txt">NOTICE</a>
            file for full legal information.
            </p>
            </div>
            """.format(
                spyder_ver=versions['spyder'],
                revision=revlink,
                website_url=__website_url__,
                github_url=__project_url__,
                trouble_url=__trouble_url__,
                forum_url=__forum_url__,
                python_ver=versions['python'],
                bitness=versions['bitness'],
                qt_ver=versions['qt'],
                qt_api=versions['qt_api'],
                qt_api_ver=versions['qt_api_ver'],
                os_name=versions['system'],
                os_ver=versions['release'],
                font_family=font_family,
                font_size=font_size,
            )
        )
        msgBox.setWindowTitle(_("About %s") % "Spyder")
        msgBox.setStandardButtons(QMessageBox.Ok)

        from spyder.config.gui import is_dark_interface
        if is_dark_interface():
            icon_filename = "spyder.svg"
        else:
            icon_filename = "spyder_dark.svg"
        app_icon = QIcon(get_image_path(icon_filename))
        msgBox.setIconPixmap(app_icon.pixmap(QSize(64, 64)))

        msgBox.setTextInteractionFlags(
            Qt.LinksAccessibleByMouse | Qt.TextSelectableByMouse)
        msgBox.exec_()

    @Slot()
    def show_dependencies(self):
        """Show Spyder's Dependencies dialog box"""
        from spyder.widgets.dependencies import DependenciesDialog
        dlg = DependenciesDialog(self)
        dlg.set_data(dependencies.DEPENDENCIES)
        dlg.exec_()

    def render_issue(self, description='', traceback=''):
        """Render issue before sending it to Github"""
        # Get component versions
        versions = get_versions()

        # Get git revision for development version
        revision = ''
        if versions['revision']:
            revision = versions['revision']

        # Make a description header in case no description is supplied
        if not description:
            description = "### What steps reproduce the problem?"

        # Make error section from traceback and add appropriate reminder header
        if traceback:
            error_section = ("### Traceback\n"
                             "```python-traceback\n"
                             "{}\n"
                             "```".format(traceback))
        else:
            error_section = ''
        issue_template = """\
## Description

{description}

{error_section}

## Versions

* Spyder version: {spyder_version} {commit}
* Python version: {python_version}
* Qt version: {qt_version}
* {qt_api_name} version: {qt_api_version}
* Operating System: {os_name} {os_version}

### Dependencies

```
{dependencies}
```
""".format(description=description,
           error_section=error_section,
           spyder_version=versions['spyder'],
           commit=revision,
           python_version=versions['python'],
           qt_version=versions['qt'],
           qt_api_name=versions['qt_api'],
           qt_api_version=versions['qt_api_ver'],
           os_name=versions['system'],
           os_version=versions['release'],
           dependencies=dependencies.status())

        return issue_template

    @Slot()
    def report_issue(self, body=None, title=None, open_webpage=False):
        """Report a Spyder issue to github, generating body text if needed."""
        if body is None:
            from spyder.widgets.reporterror import SpyderErrorDialog
            report_dlg = SpyderErrorDialog(self, is_report=True)
            report_dlg.set_color_scheme(CONF.get('appearance', 'selected'))
            report_dlg.show()
        else:
            if open_webpage:
                if PY3:
                    from urllib.parse import quote
                else:
                    from urllib import quote     # analysis:ignore
                from qtpy.QtCore import QUrlQuery

                url = QUrl(__project_url__ + '/issues/new')
                query = QUrlQuery()
                query.addQueryItem("body", quote(body))
                if title:
                    query.addQueryItem("title", quote(title))
                url.setQuery(query)
                QDesktopServices.openUrl(url)

    @Slot()
    def trouble_guide(self):
        """Open Spyder troubleshooting guide in a web browser."""
        url = QUrl(__trouble_url__)
        QDesktopServices.openUrl(url)

    @Slot()
    def google_group(self):
        """Open Spyder Google Group in a web browser."""
        url = QUrl(__forum_url__)
        QDesktopServices.openUrl(url)

    @Slot()
    def global_callback(self):
        """Global callback"""
        widget = QApplication.focusWidget()
        action = self.sender()
        callback = from_qvariant(action.data(), to_text_string)
        from spyder.plugins.editor.widgets.editor import TextEditBaseWidget
        from spyder.plugins.ipythonconsole.widgets import ControlWidget

        if isinstance(widget, (TextEditBaseWidget, ControlWidget)):
            getattr(widget, callback)()
        else:
            return

    def redirect_internalshell_stdio(self, state):
        if state:
            self.console.shell.interpreter.redirect_stds()
        else:
            self.console.shell.interpreter.restore_stds()

    def open_external_console(self, fname, wdir, args, interact, debug, python,
                              python_args, systerm, post_mortem=False):
        """Open external console"""
        if systerm:
            # Running script in an external system terminal
            try:
                if CONF.get('main_interpreter', 'default'):
                    executable = get_python_executable()
                else:
                    executable = CONF.get('main_interpreter', 'executable')
                programs.run_python_script_in_terminal(
                        fname, wdir, args, interact, debug, python_args,
                        executable)
            except NotImplementedError:
                QMessageBox.critical(self, _("Run"),
                                     _("Running an external system terminal "
                                       "is not supported on platform %s."
                                       ) % os.name)

    def execute_in_external_console(self, lines, focus_to_editor):
        """
        Execute lines in IPython console and eventually set focus
        to the Editor.
        """
        console = self.ipyconsole
        console.switch_to_plugin()
        console.execute_code(lines)
        if focus_to_editor:
            self.editor.switch_to_plugin()

    def open_file(self, fname, external=False):
        """
        Open filename with the appropriate application
        Redirect to the right widget (txt -> editor, spydata -> workspace, ...)
        or open file outside Spyder (if extension is not supported)
        """
        fname = to_text_string(fname)
        ext = osp.splitext(fname)[1]
        if encoding.is_text_file(fname):
            self.editor.load(fname)
        elif self.variableexplorer is not None and ext in IMPORT_EXT:
            self.variableexplorer.import_data(fname)
        elif not external:
            fname = file_uri(fname)
            programs.start_file(fname)

    def open_external_file(self, fname):
        """
        Open external files that can be handled either by the Editor or the
        variable explorer inside Spyder.
        """
        fname = encoding.to_unicode_from_fs(fname)
        if osp.exists(osp.join(CWD, fname)):
            fpath = osp.join(CWD, fname)
        elif osp.exists(fname):
            fpath = fname
        else:
            return

        if osp.isfile(fpath):
            self.open_file(fpath, external=True)
        elif osp.isdir(fpath):
            QMessageBox.warning(
                self, _("Error"),
                _('To open <code>{fpath}</code> as a project with Spyder, '
                  'please use <code>spyder -p "{fname}"</code>.')
                .format(fpath=osp.normpath(fpath), fname=fname)
            )

    # --- Path Manager
    # ------------------------------------------------------------------------
    def load_python_path(self):
        """Load path stored in Spyder configuration folder."""
        if osp.isfile(self.SPYDER_PATH):
            path, _x = encoding.readlines(self.SPYDER_PATH)
            self.path = tuple(name for name in path if osp.isdir(name))

        if osp.isfile(self.SPYDER_NOT_ACTIVE_PATH):
            not_active_path, _x = encoding.readlines(
                self.SPYDER_NOT_ACTIVE_PATH)
            self.not_active_path = tuple(name for name in not_active_path
                                         if osp.isdir(name))

    def save_python_path(self, new_path_dict):
        """
        Save path in Spyder configuration folder.

        `new_path_dict` is an OrderedDict that has the new paths as keys and
        the state as values. The state is `True` for active and `False` for
        inactive.
        """
        path = [p for p in new_path_dict]
        not_active_path = [p for p in new_path_dict if not new_path_dict[p]]
        try:
            encoding.writelines(path, self.SPYDER_PATH)
            encoding.writelines(not_active_path, self.SPYDER_NOT_ACTIVE_PATH)
        except EnvironmentError as e:
            logger.error(str(e))
        CONF.set('main', 'spyder_pythonpath', self.get_spyder_pythonpath())

    def get_spyder_pythonpath_dict(self):
        """
        Return Spyder PYTHONPATH.

        The returned ordered dictionary has the paths as keys and the state
        as values. The state is `True` for active and `False` for inactive.

        Example:
            OrderedDict([('/some/path, True), ('/some/other/path, False)])
        """
        self.load_python_path()

        path_dict = OrderedDict()
        for path in self.path:
            path_dict[path] = path not in self.not_active_path

        for path in self.project_path:
            path_dict[path] = True

        return path_dict

    def get_spyder_pythonpath(self):
        """
        Return Spyder PYTHONPATH.
        """
        path_dict = self.get_spyder_pythonpath_dict()
        path = [k for k, v in path_dict.items() if v]
        return path

    def update_python_path(self, new_path_dict):
        """Update python path on Spyder interpreter and kernels."""
        # Load previous path
        path_dict = self.get_spyder_pythonpath_dict()

        # Save path
        if path_dict != new_path_dict:
            # It doesn't include the project_path
            self.save_python_path(new_path_dict)

        # Load new path
        new_path_dict_p = self.get_spyder_pythonpath_dict()  # Includes project

        # Update Spyder interpreter
        for path in path_dict:
            while path in sys.path:
                sys.path.remove(path)

        for path, active in reversed(new_path_dict_p.items()):
            if active:
                sys.path.insert(1, path)

        # Any plugin that needs to do some work based on this sigal should
        # connect to it on plugin registration
        self.sig_pythonpath_changed.emit(path_dict, new_path_dict_p)

    @Slot()
    def show_path_manager(self):
        """Show path manager dialog."""
        from spyder.widgets.pathmanager import PathManager
        read_only_path = tuple(self.projects.get_pythonpath())
        dialog = PathManager(self, self.path, read_only_path,
                             self.not_active_path, sync=True)
        self._path_manager = dialog
        dialog.sig_path_changed.connect(self.update_python_path)
        dialog.redirect_stdio.connect(self.redirect_internalshell_stdio)
        dialog.show()

    def pythonpath_changed(self):
        """Project's PYTHONPATH contribution has changed."""
        self.project_path = tuple(self.projects.get_pythonpath())
        path_dict = self.get_spyder_pythonpath_dict()
        self.update_python_path(path_dict)

    @Slot()
    def win_env(self):
        """Show Windows current user environment variables."""
        self.dialog_manager.show(WinUserEnvDialog(self))

    # --- Kite
    def show_kite_installation(self):
        """Show installation dialog for Kite."""
        self.completions.get_client('kite').show_installation_dialog()

    #---- Preferences
    def apply_settings(self):
        """Apply settings changed in 'Preferences' dialog box"""
        qapp = QApplication.instance()
        # Set 'gtk+' as the default theme in Gtk-based desktops
        # Fixes spyder-ide/spyder#2036.
        if is_gtk_desktop() and ('GTK+' in QStyleFactory.keys()):
            try:
                qapp.setStyle('gtk+')
            except:
                pass
        else:
            style_name = CONF.get('appearance', 'windows_style',
                                  self.default_style)
            style = QStyleFactory.create(style_name)
            if style is not None:
                style.setProperty('name', style_name)
                qapp.setStyle(style)

        default = self.DOCKOPTIONS
        if CONF.get('main', 'vertical_tabs'):
            default = default|QMainWindow.VerticalTabs
        if CONF.get('main', 'animated_docks'):
            default = default|QMainWindow.AnimatedDocks
        self.setDockOptions(default)

        self.apply_panes_settings()
        self.apply_statusbar_settings()

        if CONF.get('main', 'use_custom_cursor_blinking'):
            qapp.setCursorFlashTime(CONF.get('main', 'custom_cursor_blinking'))
        else:
            qapp.setCursorFlashTime(self.CURSORBLINK_OSDEFAULT)

    def apply_panes_settings(self):
        """Update dockwidgets features settings"""
        for plugin in (self.widgetlist + self.thirdparty_plugins):
            features = plugin.dockwidget.FEATURES
            if CONF.get('main', 'vertical_dockwidget_titlebars'):
                features = features | QDockWidget.DockWidgetVerticalTitleBar
            plugin.dockwidget.setFeatures(features)
            plugin._update_margins()

    def apply_statusbar_settings(self):
        """Update status bar widgets settings"""
        show_status_bar = CONF.get('main', 'show_status_bar')
        self.statusBar().setVisible(show_status_bar)

        if show_status_bar:
            for widget, name in ((self.mem_status, 'memory_usage'),
                                 (self.cpu_status, 'cpu_usage'),
                                 (self.clock_status, 'clock')):
                if widget is not None:
                    widget.setVisible(CONF.get('main', '%s/enable' % name))
                    widget.set_interval(CONF.get('main', '%s/timeout' % name))

            # Update conda status widget
            if is_anaconda() and self.conda_status:
                interpreter = self.get_main_interpreter()
                self.conda_status.update_interpreter(interpreter)
        else:
            return

    @Slot()
    def show_preferences(self):
        """Edit Spyder preferences."""
        from spyder.preferences.configdialog import ConfigDialog

        def _dialog_finished(result_code):
            """Restore preferences dialog instance variable."""
            self.prefs_dialog_instance = None

        if self.prefs_dialog_instance is None:
            dlg = ConfigDialog(self)
            dlg.setStyleSheet("QTabWidget::tab-bar {"
                              "alignment: left;}")
            self.prefs_dialog_instance = dlg

            # Setup
            if self.prefs_dialog_size is not None:
                dlg.resize(self.prefs_dialog_size)

            for PrefPageClass in self.general_prefs:
                widget = PrefPageClass(dlg, main=self)
                widget.initialize()
                dlg.add_page(widget)

            widget = self.completions._create_configwidget(dlg, self)
            if widget is not None:
                dlg.add_page(widget)

            for completion_plugin in self.completions.clients.values():
                completion_plugin = completion_plugin['plugin']
                widget = completion_plugin._create_configwidget(dlg, self)
                if widget is not None:
                    dlg.add_page(widget)

            for plugin in [self.workingdirectory, self.editor,
                           self.projects, self.ipyconsole,
                           self.historylog, self.help, self.variableexplorer,
                           self.onlinehelp, self.explorer, self.findinfiles
                           ] + self.thirdparty_plugins:
                if plugin is not None:
                    try:
                        widget = plugin._create_configwidget(dlg, self)
                        if widget is not None:
                            dlg.add_page(widget)
                    except Exception:
                        # Avoid a crash at startup if a plugin's config
                        # page fails to load.
                        traceback.print_exc(file=sys.stderr)

            if self.prefs_index is not None:
                dlg.set_current_index(self.prefs_index)

            # Check settings and show dialog
            dlg.show()
            dlg.check_all_settings()

            # Signals
            dlg.finished.connect(_dialog_finished)
            dlg.pages_widget.currentChanged.connect(
                self.__preference_page_changed)
            dlg.size_change.connect(self.set_prefs_size)
        else:
            self.prefs_dialog_instance.show()
            self.prefs_dialog_instance.activateWindow()
            self.prefs_dialog_instance.raise_()
            self.prefs_dialog_instance.setFocus()

    def __preference_page_changed(self, index):
        """Preference page index has changed."""
        self.prefs_index = index

    def set_prefs_size(self, size):
        """Save preferences dialog size"""
        self.prefs_dialog_size = size

    #---- Shortcuts
    def register_shortcut(self, qaction_or_qshortcut, context, name,
                          add_shortcut_to_tip=False, plugin_name=None):
        """
        Register QAction or QShortcut to Spyder main application,
        with shortcut (context, name, default)
        """
        self.shortcut_data.append((qaction_or_qshortcut, context,
                                   name, add_shortcut_to_tip, plugin_name))

    def apply_shortcuts(self):
        """Apply shortcuts settings to all widgets/plugins."""
        toberemoved = []
        for index, (qobject, context, name, add_shortcut_to_tip,
                    plugin_name) in enumerate(self.shortcut_data):
            try:
                shortcut_sequence = CONF.get_shortcut(context, name,
                                                      plugin_name)
            except (cp.NoSectionError, cp.NoOptionError):
                # If shortcut does not exist, save it to CONF. This is an
                # action for which there is no shortcut assigned (yet) in
                # the configuration
                CONF.set_shortcut(context, name, '', plugin_name)
                shortcut_sequence = ''

            if shortcut_sequence:
                keyseq = QKeySequence(shortcut_sequence)
                try:
                    if isinstance(qobject, QAction):
                        if (sys.platform == 'darwin'
                                and qobject._shown_shortcut == 'missing'):
                            qobject._shown_shortcut = keyseq
                        else:
                            qobject.setShortcut(keyseq)

                        if add_shortcut_to_tip:
                            add_shortcut_to_tooltip(qobject, context, name)

                    elif isinstance(qobject, QShortcut):
                        qobject.setKey(keyseq)

                except RuntimeError:
                    # Object has been deleted
                    toberemoved.append(index)

        for index in sorted(toberemoved, reverse=True):
            self.shortcut_data.pop(index)

        # TODO: Update plugin API to include an update shortcuts method
        # See: spyder-ide/spyder#6992
        if self.help:
            self.help.show_intro_message()

    @Slot()
    def show_shortcuts_dialog(self):
        from spyder.widgets.shortcutssummary import ShortcutsSummaryDialog
        dlg = ShortcutsSummaryDialog(None)
        dlg.exec_()

    # -- Open files server
    def start_open_files_server(self):
        self.open_files_server.setsockopt(socket.SOL_SOCKET,
                                          socket.SO_REUSEADDR, 1)
        port = select_port(default_port=OPEN_FILES_PORT)
        CONF.set('main', 'open_files_port', port)
        self.open_files_server.bind(('127.0.0.1', port))
        self.open_files_server.listen(20)
        while 1:  # 1 is faster than True
            try:
                req, dummy = self.open_files_server.accept()
            except socket.error as e:
                # See spyder-ide/spyder#1275 for details on why errno EINTR is
                # silently ignored here.
                eintr = errno.WSAEINTR if os.name == 'nt' else errno.EINTR
                # To avoid a traceback after closing on Windows
                if e.args[0] == eintr:
                    continue
                # handle a connection abort on close error
                enotsock = (errno.WSAENOTSOCK if os.name == 'nt'
                            else errno.ENOTSOCK)
                if e.args[0] in [errno.ECONNABORTED, enotsock]:
                    return
                raise
            fname = req.recv(1024)
            fname = fname.decode('utf-8')
            self.sig_open_external_file.emit(fname)
            req.sendall(b' ')

    # ---- Quit and restart, and reset spyder defaults
    @Slot()
    def reset_spyder(self):
        """
        Quit and reset Spyder and then Restart application.
        """
        answer = QMessageBox.warning(self, _("Warning"),
             _("Spyder will restart and reset to default settings: <br><br>"
               "Do you want to continue?"),
             QMessageBox.Yes | QMessageBox.No)
        if answer == QMessageBox.Yes:
            self.restart(reset=True)

    @Slot()
    def restart(self, reset=False):
        """
        Quit and Restart Spyder application.

        If reset True it allows to reset spyder on restart.
        """
        # Get start path to use in restart script
        spyder_start_directory = get_module_path('spyder')
        restart_script = osp.join(spyder_start_directory, 'app', 'restart.py')

        # Get any initial argument passed when spyder was started
        # Note: Variables defined in bootstrap.py and spyder/app/start.py
        env = os.environ.copy()
        bootstrap_args = env.pop('SPYDER_BOOTSTRAP_ARGS', None)
        spyder_args = env.pop('SPYDER_ARGS')

        # Get current process and python running spyder
        pid = os.getpid()
        python = sys.executable

        # Check if started with bootstrap.py
        if bootstrap_args is not None:
            spyder_args = bootstrap_args
            is_bootstrap = True
        else:
            is_bootstrap = False

        # Pass variables as environment variables (str) to restarter subprocess
        env['SPYDER_ARGS'] = spyder_args
        env['SPYDER_PID'] = str(pid)
        env['SPYDER_IS_BOOTSTRAP'] = str(is_bootstrap)
        env['SPYDER_RESET'] = str(reset)

        if DEV:
            repo_dir = osp.dirname(spyder_start_directory)
            if os.name == 'nt':
                env['PYTHONPATH'] = ';'.join([repo_dir])
            else:
                env['PYTHONPATH'] = ':'.join([repo_dir])

        # Build the command and popen arguments depending on the OS
        if os.name == 'nt':
            # Hide flashing command prompt
            startupinfo = subprocess.STARTUPINFO()
            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
            shell = False
        else:
            startupinfo = None
            shell = True

        command = '"{0}" "{1}"'
        command = command.format(python, restart_script)

        try:
            if self.closing(True):
                subprocess.Popen(command, shell=shell, env=env,
                                 startupinfo=startupinfo)
                self.console.quit()
        except Exception as error:
            # If there is an error with subprocess, Spyder should not quit and
            # the error can be inspected in the internal console
            print(error)  # spyder: test-skip
            print(command)  # spyder: test-skip

    # ---- Interactive Tours
    def show_tour(self, index):
        """Show interactive tour."""
        self.maximize_dockwidget(restore=True)
        frames = self.tours_available[index]
        self.tour.set_tour(index, frames, self)
        self.tour.start_tour()

    # ---- Global Switcher
    def open_switcher(self, symbol=False):
        """Open switcher dialog box."""
        if self.switcher is not None and self.switcher.isVisible():
            self.switcher.clear()
            self.switcher.hide()
            return
        if symbol:
            self.switcher.set_search_text('@')
        else:
            self.switcher.set_search_text('')
            self.switcher.setup()
        self.switcher.show()

        # Note: The +6 pixel on the top makes it look better
        delta_top = (self.toolbars_menu.geometry().height() +
                     self.menuBar().geometry().height() + 6)
        self.switcher.set_position(delta_top)

    def open_symbolfinder(self):
        """Open symbol list management dialog box."""
        self.open_switcher(symbol=True)

    def create_switcher(self):
        """Create switcher dialog instance."""
        if self.switcher is None:
            from spyder.widgets.switcher import Switcher
            self.switcher = Switcher(self)

        return self.switcher

    # ---- Check for Spyder Updates
    def _check_updates_ready(self):
        """Called by WorkerUpdates when ready"""
        from spyder.widgets.helperwidgets import MessageCheckBox

        # feedback` = False is used on startup, so only positive feedback is
        # given. `feedback` = True is used when after startup (when using the
        # menu action, and gives feeback if updates are, or are not found.
        feedback = self.give_updates_feedback

        # Get results from worker
        update_available = self.worker_updates.update_available
        latest_release = self.worker_updates.latest_release
        error_msg = self.worker_updates.error

        url_r = __project_url__ + '/releases'
        url_i = 'https://docs.spyder-ide.org/installation.html'

        # Define the custom QMessageBox
        box = MessageCheckBox(icon=QMessageBox.Information,
                              parent=self)
        box.setWindowTitle(_("Spyder updates"))
        box.set_checkbox_text(_("Check for updates on startup"))
        box.setStandardButtons(QMessageBox.Ok)
        box.setDefaultButton(QMessageBox.Ok)

        # Adjust the checkbox depending on the stored configuration
        section, option = 'main', 'check_updates_on_startup'
        check_updates = CONF.get(section, option)
        box.set_checked(check_updates)

        if error_msg is not None:
            msg = error_msg
            box.setText(msg)
            box.set_check_visible(False)
            box.exec_()
            check_updates = box.is_checked()
        else:
            if update_available:
                anaconda_msg = ''
                if 'Anaconda' in sys.version or 'conda-forge' in sys.version:
                    anaconda_msg = _("<hr><b>IMPORTANT NOTE:</b> It seems "
                                     "that you are using Spyder with "
                                     "<b>Anaconda/Miniconda</b>. Please "
                                     "<b>don't</b> use <code>pip</code> to "
                                     "update it as that will probably break "
                                     "your installation.<br><br>"
                                     "Instead, please wait until new conda "
                                     "packages are available and use "
                                     "<code>conda</code> to perform the "
                                     "update.<hr>")
                msg = _("<b>Spyder %s is available!</b> <br><br>Please use "
                        "your package manager to update Spyder or go to our "
                        "<a href=\"%s\">Releases</a> page to download this "
                        "new version. <br><br>If you are not sure how to "
                        "proceed to update Spyder please refer to our "
                        " <a href=\"%s\">Installation</a> instructions."
                        "") % (latest_release, url_r, url_i)
                msg += '<br>' + anaconda_msg
                box.setText(msg)
                box.set_check_visible(True)
                box.exec_()
                check_updates = box.is_checked()
            elif feedback:
                msg = _("Spyder is up to date.")
                box.setText(msg)
                box.set_check_visible(False)
                box.exec_()
                check_updates = box.is_checked()

        # Update checkbox based on user interaction
        CONF.set(section, option, check_updates)

        # Enable check_updates_action after the thread has finished
        self.check_updates_action.setDisabled(False)

        # Provide feeback when clicking menu if check on startup is on
        self.give_updates_feedback = True

    @Slot()
    def check_updates(self, startup=False):
        """
        Check for spyder updates on github releases using a QThread.
        """
        from spyder.workers.updates import WorkerUpdates

        # Disable check_updates_action while the thread is working
        self.check_updates_action.setDisabled(True)

        if self.thread_updates is not None:
            self.thread_updates.terminate()

        self.thread_updates = QThread(self)
        self.worker_updates = WorkerUpdates(self, startup=startup)
        self.worker_updates.sig_ready.connect(self._check_updates_ready)
        self.worker_updates.sig_ready.connect(self.thread_updates.quit)
        self.worker_updates.moveToThread(self.thread_updates)
        self.thread_updates.started.connect(self.worker_updates.start)
        self.thread_updates.start()

    # --- Main interpreter
    # ------------------------------------------------------------------------
    def get_main_interpreter(self):
        if CONF.get('main_interpreter', 'default'):
            return sys.executable
        else:
            return CONF.get('main_interpreter', 'custom_interpreter')

    # --- For OpenGL
    def _test_setting_opengl(self, option):
        """Get the current OpenGL implementation in use"""
        if option == 'software':
            return QCoreApplication.testAttribute(Qt.AA_UseSoftwareOpenGL)
        elif option == 'desktop':
            return QCoreApplication.testAttribute(Qt.AA_UseDesktopOpenGL)
        elif option == 'gles':
            return QCoreApplication.testAttribute(Qt.AA_UseOpenGLES)


#==============================================================================
# Utilities to create the 'main' function
#==============================================================================
def initialize():
    """Initialize Qt, patching sys.exit and eventually setting up ETS"""
    # This doesn't create our QApplication, just holds a reference to
    # MAIN_APP, created above to show our splash screen as early as
    # possible
    app = qapplication()

    # --- Set application icon
    app.setWindowIcon(APP_ICON)

    #----Monkey patching QApplication
    class FakeQApplication(QApplication):
        """Spyder's fake QApplication"""
        def __init__(self, args):
            self = app  # analysis:ignore
        @staticmethod
        def exec_():
            """Do nothing because the Qt mainloop is already running"""
            pass
    from qtpy import QtWidgets
    QtWidgets.QApplication = FakeQApplication

    # ----Monkey patching sys.exit
    def fake_sys_exit(arg=[]):
        pass
    sys.exit = fake_sys_exit

    # ----Monkey patching sys.excepthook to avoid crashes in PyQt 5.5+
    if PYQT5:
        def spy_excepthook(type_, value, tback):
            sys.__excepthook__(type_, value, tback)
        sys.excepthook = spy_excepthook

    # Removing arguments from sys.argv as in standard Python interpreter
    sys.argv = ['']

    # Selecting Qt4 backend for Enthought Tool Suite (if installed)
    try:
        from enthought.etsconfig.api import ETSConfig
        ETSConfig.toolkit = 'qt4'
    except ImportError:
        pass

    return app


class Spy(object):
    """
    Inspect Spyder internals

    Attributes:
        app       Reference to main QApplication object
        window    Reference to spyder.MainWindow widget
    """
    def __init__(self, app, window):
        self.app = app
        self.window = window
    def __dir__(self):
        return list(self.__dict__.keys()) +\
                 [x for x in dir(self.__class__) if x[0] != '_']
    def versions(self):
        return get_versions()


def run_spyder(app, options, args):
    """
    Create and show Spyder's main window
    Start QApplication event loop
    """
    #TODO: insert here
    # Main window
    main = MainWindow(options)
    try:
        main.setup()
    except BaseException:
        if main.console is not None:
            try:
                main.console.shell.exit_interpreter()
            except BaseException:
                pass
        raise

    main.show()
    main.post_visible_setup()

    if main.console:
        main.console.shell.interpreter.namespace['spy'] = \
                                                    Spy(app=app, window=main)

    # Don't show icons in menus for Mac
    if sys.platform == 'darwin':
        QCoreApplication.setAttribute(Qt.AA_DontShowIconsInMenus, True)

    # Open external files with our Mac app
    if sys.platform == "darwin":
        app.sig_open_external_file.connect(main.open_external_file)
        app._has_started = True
        if hasattr(app, '_pending_file_open'):
            if args:
                args = app._pending_file_open + args
            else:
                args = app._pending_file_open


    # Open external files passed as args
    if args:
        for a in args:
            main.open_external_file(a)

    # To give focus again to the last focused widget after restoring
    # the window
    app.focusChanged.connect(main.change_last_focused_widget)

    if not running_under_pytest():
        app.exec_()
    return main


#==============================================================================
# Main
#==============================================================================
def main():
    """Main function"""
    # **** For Pytest ****
    if running_under_pytest():
        if CONF.get('main', 'opengl') != 'automatic':
            option = CONF.get('main', 'opengl')
            set_opengl_implementation(option)

        app = initialize()
        window = run_spyder(app, CLI_OPTIONS, None)
        return window

    # **** Collect command line options ****
    # Note regarding Options:
    # It's important to collect options before monkey patching sys.exit,
    # otherwise, argparse won't be able to exit if --help option is passed
    options, args = (CLI_OPTIONS, CLI_ARGS)

    # **** Handle hide_console option ****
    if options.show_console:
        print("(Deprecated) --show console does nothing, now the default "
              " behavior is to show the console, use --hide-console if you "
              "want to hide it")

    if set_attached_console_visible is not None:
        set_attached_console_visible(not options.hide_console
                                     or options.reset_config_files
                                     or options.reset_to_defaults
                                     or options.optimize
                                     or bool(get_debug_level()))

    # **** Set debugging info ****
    setup_logging(options)

    # **** Create the application ****
    app = initialize()

    # **** Handle other options ****
    if options.reset_config_files:
        # <!> Remove all configuration files!
        reset_config_files()
        return
    elif options.reset_to_defaults:
        # Reset Spyder settings to defaults
        CONF.reset_to_defaults()
        return
    elif options.optimize:
        # Optimize the whole Spyder's source code directory
        import spyder
        programs.run_python_script(module="compileall",
                                   args=[spyder.__path__[0]], p_args=['-O'])
        return

    # **** Read faulthandler log file ****
    faulthandler_file = get_conf_path('faulthandler.log')
    previous_crash = ''
    if osp.exists(faulthandler_file):
        with open(faulthandler_file, 'r') as f:
            previous_crash = f.read()

        # Remove file to not pick it up for next time.
        try:
            dst = get_conf_path('faulthandler.log.old')
            shutil.move(faulthandler_file, dst)
        except Exception:
            pass
    CONF.set('main', 'previous_crash', previous_crash)

    # **** Create main window ****
    mainwindow = None
    try:
        if PY3 and options.report_segfault:
            import faulthandler
            with open(faulthandler_file, 'w') as f:
                faulthandler.enable(file=f)
                mainwindow = run_spyder(app, options, args)
        else:
            mainwindow = run_spyder(app, options, args)
    except FontError as fontError:
        QMessageBox.information(None, "Spyder",
                "Spyder was unable to load the <i>Spyder 3</i> "
                "icon theme. That's why it's going to fallback to the "
                "theme used in Spyder 2.<br><br>"
                "For that, please close this window and start Spyder again.")
        CONF.set('appearance', 'icon_theme', 'spyder 2')
    if mainwindow is None:
        # An exception occurred
        if SPLASH is not None:
            SPLASH.hide()
        return

    ORIGINAL_SYS_EXIT()


if __name__ == "__main__":
    main()
