""" A minimal application using the Qt console-style Jupyter frontend. This is not a complete console app, as subprocess will not be able to receive input, there is no real readline support, among other limitations. """ # Copyright (c) Jupyter Development Team. # Distributed under the terms of the Modified BSD License. import os import signal import sys from warnings import warn # If run on Windows: # # 1. Install an exception hook which pops up a message box. # Pythonw.exe hides the console, so without this the application # silently fails to load. # # We always install this handler, because the expectation is for # qtconsole to bring up a GUI even if called from the console. # The old handler is called, so the exception is printed as well. # If desired, check for pythonw with an additional condition # (sys.executable.lower().find('pythonw.exe') >= 0). # # 2. Set AppUserModelID for Windows 7 and later so that qtconsole # uses its assigned taskbar icon instead of grabbing the one with # the same AppUserModelID # if os.name == 'nt': # 1. old_excepthook = sys.excepthook # Exclude this from our autogenerated API docs. undoc = lambda func: func @undoc def gui_excepthook(exctype, value, tb): try: import ctypes, traceback MB_ICONERROR = 0x00000010 title = u'Error starting QtConsole' msg = u''.join(traceback.format_exception(exctype, value, tb)) ctypes.windll.user32.MessageBoxW(0, msg, title, MB_ICONERROR) finally: # Also call the old exception hook to let it do # its thing too. old_excepthook(exctype, value, tb) sys.excepthook = gui_excepthook # 2. try: from ctypes import windll windll.shell32.SetCurrentProcessExplicitAppUserModelID("Jupyter.Qtconsole") except AttributeError: pass from qtpy import QtCore, QtGui, QtWidgets from traitlets.config.application import boolean_flag from traitlets.config.application import catch_config_error from qtconsole.jupyter_widget import JupyterWidget from qtconsole.rich_jupyter_widget import RichJupyterWidget from qtconsole import styles, __version__ from qtconsole.mainwindow import MainWindow from qtconsole.client import QtKernelClient from qtconsole.manager import QtKernelManager from traitlets import ( Dict, Unicode, CBool, Any ) from jupyter_core.application import JupyterApp, base_flags, base_aliases from jupyter_client.consoleapp import ( JupyterConsoleApp, app_aliases, app_flags, ) from jupyter_client.localinterfaces import is_local_ip _examples = """ jupyter qtconsole # start the qtconsole """ #----------------------------------------------------------------------------- # Aliases and Flags #----------------------------------------------------------------------------- # FIXME: workaround bug in jupyter_client < 4.1 excluding base_flags,aliases flags = dict(base_flags) qt_flags = { 'plain' : ({'JupyterQtConsoleApp' : {'plain' : True}}, "Disable rich text support."), } qt_flags.update(boolean_flag( 'banner', 'JupyterQtConsoleApp.display_banner', "Display a banner upon starting the QtConsole.", "Don't display a banner upon starting the QtConsole." )) # and app_flags from the Console Mixin qt_flags.update(app_flags) # add frontend flags to the full set flags.update(qt_flags) # start with copy of base jupyter aliases aliases = dict(base_aliases) qt_aliases = dict( style = 'JupyterWidget.syntax_style', stylesheet = 'JupyterQtConsoleApp.stylesheet', editor = 'JupyterWidget.editor', paging = 'ConsoleWidget.paging', ) # and app_aliases from the Console Mixin qt_aliases.update(app_aliases) qt_aliases.update({'gui-completion':'ConsoleWidget.gui_completion'}) # add frontend aliases to the full set aliases.update(qt_aliases) # get flags&aliases into sets, and remove a couple that # shouldn't be scrubbed from backend flags: qt_aliases = set(qt_aliases.keys()) qt_flags = set(qt_flags.keys()) class JupyterQtConsoleApp(JupyterApp, JupyterConsoleApp): name = 'jupyter-qtconsole' version = __version__ description = """ The Jupyter QtConsole. This launches a Console-style application using Qt. It is not a full console, in that launched terminal subprocesses will not be able to accept input. """ examples = _examples classes = [JupyterWidget] + JupyterConsoleApp.classes flags = Dict(flags) aliases = Dict(aliases) frontend_flags = Any(qt_flags) frontend_aliases = Any(qt_aliases) kernel_client_class = QtKernelClient kernel_manager_class = QtKernelManager stylesheet = Unicode('', config=True, help="path to a custom CSS stylesheet") hide_menubar = CBool(False, config=True, help="Start the console window with the menu bar hidden.") maximize = CBool(False, config=True, help="Start the console window maximized.") plain = CBool(False, config=True, help="Use a plaintext widget instead of rich text (plain can't print/save).") display_banner = CBool(True, config=True, help="Whether to display a banner upon starting the QtConsole." ) def _plain_changed(self, name, old, new): kind = 'plain' if new else 'rich' self.config.ConsoleWidget.kind = kind if new: self.widget_factory = JupyterWidget else: self.widget_factory = RichJupyterWidget # the factory for creating a widget widget_factory = Any(RichJupyterWidget) def parse_command_line(self, argv=None): super(JupyterQtConsoleApp, self).parse_command_line(argv) self.build_kernel_argv(self.extra_args) def new_frontend_master(self): """ Create and return new frontend attached to new kernel, launched on localhost. """ kernel_manager = self.kernel_manager_class( connection_file=self._new_connection_file(), parent=self, autorestart=True, ) # start the kernel kwargs = {} # FIXME: remove special treatment of IPython kernels if self.kernel_manager.ipykernel: kwargs['extra_arguments'] = self.kernel_argv kernel_manager.start_kernel(**kwargs) kernel_manager.client_factory = self.kernel_client_class kernel_client = kernel_manager.client() kernel_client.start_channels(shell=True, iopub=True) widget = self.widget_factory(config=self.config, local_kernel=True) self.init_colors(widget) widget.kernel_manager = kernel_manager widget.kernel_client = kernel_client widget._existing = False widget._may_close = True widget._confirm_exit = self.confirm_exit widget._display_banner = self.display_banner return widget def new_frontend_connection(self, connection_file): """Create and return a new frontend attached to an existing kernel. Parameters ---------- connection_file : str The connection_file path this frontend is to connect to """ kernel_client = self.kernel_client_class( connection_file=connection_file, config=self.config, ) kernel_client.load_connection_file() kernel_client.start_channels() widget = self.widget_factory(config=self.config, local_kernel=False) self.init_colors(widget) widget._existing = True widget._may_close = False widget._confirm_exit = False widget._display_banner = self.display_banner widget.kernel_client = kernel_client widget.kernel_manager = None return widget def new_frontend_slave(self, current_widget): """Create and return a new frontend attached to an existing kernel. Parameters ---------- current_widget : JupyterWidget The JupyterWidget whose kernel this frontend is to share """ kernel_client = self.kernel_client_class( connection_file=current_widget.kernel_client.connection_file, config = self.config, ) kernel_client.load_connection_file() kernel_client.start_channels() widget = self.widget_factory(config=self.config, local_kernel=False) self.init_colors(widget) widget._existing = True widget._may_close = False widget._confirm_exit = False widget._display_banner = self.display_banner widget.kernel_client = kernel_client widget.kernel_manager = current_widget.kernel_manager return widget def init_qt_app(self): # separate from qt_elements, because it must run first self.app = QtWidgets.QApplication(['jupyter-qtconsole']) self.app.setApplicationName('jupyter-qtconsole') def init_qt_elements(self): # Create the widget. base_path = os.path.abspath(os.path.dirname(__file__)) icon_path = os.path.join(base_path, 'resources', 'icon', 'JupyterConsole.svg') self.app.icon = QtGui.QIcon(icon_path) QtWidgets.QApplication.setWindowIcon(self.app.icon) ip = self.ip local_kernel = (not self.existing) or is_local_ip(ip) self.widget = self.widget_factory(config=self.config, local_kernel=local_kernel) self.init_colors(self.widget) self.widget._existing = self.existing self.widget._may_close = not self.existing self.widget._confirm_exit = self.confirm_exit self.widget._display_banner = self.display_banner self.widget.kernel_manager = self.kernel_manager self.widget.kernel_client = self.kernel_client self.window = MainWindow(self.app, confirm_exit=self.confirm_exit, new_frontend_factory=self.new_frontend_master, slave_frontend_factory=self.new_frontend_slave, connection_frontend_factory=self.new_frontend_connection, ) self.window.log = self.log self.window.add_tab_with_frontend(self.widget) self.window.init_menu_bar() # Ignore on OSX, where there is always a menu bar if sys.platform != 'darwin' and self.hide_menubar: self.window.menuBar().setVisible(False) self.window.setWindowTitle('Jupyter QtConsole') def init_colors(self, widget): """Configure the coloring of the widget""" # Note: This will be dramatically simplified when colors # are removed from the backend. # parse the colors arg down to current known labels cfg = self.config colors = cfg.ZMQInteractiveShell.colors if 'ZMQInteractiveShell.colors' in cfg else None style = cfg.JupyterWidget.syntax_style if 'JupyterWidget.syntax_style' in cfg else None sheet = cfg.JupyterWidget.style_sheet if 'JupyterWidget.style_sheet' in cfg else None # find the value for colors: if colors: colors=colors.lower() if colors in ('lightbg', 'light'): colors='lightbg' elif colors in ('dark', 'linux'): colors='linux' else: colors='nocolor' elif style: if style=='bw': colors='nocolor' elif styles.dark_style(style): colors='linux' else: colors='lightbg' else: colors=None # Configure the style if style: widget.style_sheet = styles.sheet_from_template(style, colors) widget.syntax_style = style widget._syntax_style_changed() widget._style_sheet_changed() elif colors: # use a default dark/light/bw style widget.set_default_style(colors=colors) if self.stylesheet: # we got an explicit stylesheet if os.path.isfile(self.stylesheet): with open(self.stylesheet) as f: sheet = f.read() else: raise IOError("Stylesheet %r not found." % self.stylesheet) if sheet: widget.style_sheet = sheet widget._style_sheet_changed() def init_signal(self): """allow clean shutdown on sigint""" signal.signal(signal.SIGINT, lambda sig, frame: self.exit(-2)) # need a timer, so that QApplication doesn't block until a real # Qt event fires (can require mouse movement) # timer trick from http://stackoverflow.com/q/4938723/938949 timer = QtCore.QTimer() # Let the interpreter run each 200 ms: timer.timeout.connect(lambda: None) timer.start(200) # hold onto ref, so the timer doesn't get cleaned up self._sigint_timer = timer def _deprecate_config(self, cfg, old_name, new_name): """Warn about deprecated config.""" if old_name in cfg: self.log.warning( "Use %s in config, not %s. Outdated config:\n %s", new_name, old_name, '\n '.join( '{name}.{key} = {value!r}'.format(key=key, value=value, name=old_name) for key, value in self.config[old_name].items() ) ) cfg = cfg.copy() cfg[new_name].merge(cfg[old_name]) return cfg def _init_asyncio_patch(self): """ Same workaround fix as https://github.com/ipython/ipykernel/pull/456 Set default asyncio policy to be compatible with tornado Tornado 6 (at least) is not compatible with the default asyncio implementation on Windows Pick the older SelectorEventLoopPolicy on Windows if the known-incompatible default policy is in use. do this as early as possible to make it a low priority and overrideable ref: https://github.com/tornadoweb/tornado/issues/2608 FIXME: if/when tornado supports the defaults in asyncio, remove and bump tornado requirement for py38 """ if sys.platform.startswith("win") and sys.version_info >= (3, 8): import asyncio try: from asyncio import ( WindowsProactorEventLoopPolicy, WindowsSelectorEventLoopPolicy, ) except ImportError: pass # not affected else: if type(asyncio.get_event_loop_policy()) is WindowsProactorEventLoopPolicy: # WindowsProactorEventLoopPolicy is not compatible with tornado 6 # fallback to the pre-3.8 default of Selector asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy()) @catch_config_error def initialize(self, argv=None): self._init_asyncio_patch() self.init_qt_app() super(JupyterQtConsoleApp, self).initialize(argv) if self._dispatching: return # handle deprecated renames for old_name, new_name in [ ('IPythonQtConsoleApp', 'JupyterQtConsole'), ('IPythonWidget', 'JupyterWidget'), ('RichIPythonWidget', 'RichJupyterWidget'), ]: cfg = self._deprecate_config(self.config, old_name, new_name) if cfg: self.update_config(cfg) JupyterConsoleApp.initialize(self,argv) self.init_qt_elements() self.init_signal() def start(self): super(JupyterQtConsoleApp, self).start() # draw the window if self.maximize: self.window.showMaximized() else: self.window.show() self.window.raise_() # Start the application main loop. self.app.exec_() class IPythonQtConsoleApp(JupyterQtConsoleApp): def __init__(self, *a, **kw): warn("IPythonQtConsoleApp is deprecated; use JupyterQtConsoleApp", DeprecationWarning) super(IPythonQtConsoleApp, self).__init__(*a, **kw) # ----------------------------------------------------------------------------- # Main entry point # ----------------------------------------------------------------------------- def main(): JupyterQtConsoleApp.launch_instance() if __name__ == '__main__': main()