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""" A minimal application using the Qt console-style IPython frontend.
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This is not a complete console app, as subprocess will not be able to receive
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input, there is no real readline support, among other limitations.
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Authors:
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* Evan Patterson
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* Min RK
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* Erik Tollerud
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* Fernando Perez
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* Bussonnier Matthias
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* Thomas Kluyver
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* Paul Ivanov
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# stdlib imports
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import json
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import os
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import signal
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import sys
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import uuid
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# System library imports
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from IPython.external.qt import QtGui
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# Local imports
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from IPython.config.application import boolean_flag, catch_config_error
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from IPython.core.application import BaseIPythonApplication
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from IPython.core.profiledir import ProfileDir
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from IPython.lib.kernel import tunnel_to_kernel, find_connection_file
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from IPython.frontend.qt.console.frontend_widget import FrontendWidget
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from IPython.frontend.qt.console.ipython_widget import IPythonWidget
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from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
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from IPython.frontend.qt.console import styles
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from IPython.frontend.qt.console.mainwindow import MainWindow
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from IPython.frontend.qt.kernelmanager import QtKernelManager
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from IPython.utils.path import filefind
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from IPython.utils.py3compat import str_to_bytes
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from IPython.utils.traitlets import (
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Dict, List, Unicode, Integer, CaselessStrEnum, CBool, Any
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)
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from IPython.zmq.ipkernel import IPKernelApp
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from IPython.zmq.session import Session, default_secure
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from IPython.zmq.zmqshell import ZMQInteractiveShell
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from IPython.frontend.kernelmixinapp import (
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IPythonMixinConsoleApp, app_aliases, app_flags
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)
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#-----------------------------------------------------------------------------
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# Network Constants
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#-----------------------------------------------------------------------------
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from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS
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#-----------------------------------------------------------------------------
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# Globals
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#-----------------------------------------------------------------------------
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_examples = """
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ipython qtconsole # start the qtconsole
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ipython qtconsole --pylab=inline # start with pylab in inline plotting mode
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"""
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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flags = dict(app_flags)
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qt_flags = {
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#'existing' : ({'IPythonQtConsoleApp' : {'existing' : 'kernel*.json'}},
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# "Connect to an existing kernel. If no argument specified, guess most recent"),
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'pure' : ({'IPythonQtConsoleApp' : {'pure' : True}},
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"Use a pure Python kernel instead of an IPython kernel."),
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'plain' : ({'ConsoleWidget' : {'kind' : 'plain'}},
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"Disable rich text support."),
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}
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qt_flags.update(boolean_flag(
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'gui-completion', 'ConsoleWidget.gui_completion',
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"use a GUI widget for tab completion",
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"use plaintext output for completion"
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))
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flags.update(qt_flags)
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aliases = dict(app_aliases)
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qt_aliases = dict(
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existing = 'IPythonQtConsoleApp.existing',
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f = 'IPythonQtConsoleApp.connection_file',
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style = 'IPythonWidget.syntax_style',
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stylesheet = 'IPythonQtConsoleApp.stylesheet',
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colors = 'ZMQInteractiveShell.colors',
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editor = 'IPythonWidget.editor',
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paging = 'ConsoleWidget.paging',
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)
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aliases.update(qt_aliases)
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# IPythonQtConsole
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#-----------------------------------------------------------------------------
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class IPythonQtConsoleApp(BaseIPythonApplication, IPythonMixinConsoleApp):
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name = 'ipython-qtconsole'
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default_config_file_name='ipython_config.py'
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description = """
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The IPython QtConsole.
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This launches a Console-style application using Qt. It is not a full
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console, in that launched terminal subprocesses will not be able to accept
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input.
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The QtConsole supports various extra features beyond the Terminal IPython
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shell, such as inline plotting with matplotlib, via:
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ipython qtconsole --pylab=inline
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as well as saving your session as HTML, and printing the output.
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"""
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examples = _examples
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classes = [IPKernelApp, IPythonWidget, ZMQInteractiveShell, ProfileDir, Session]
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flags = Dict(flags)
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aliases = Dict(aliases)
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kernel_manager_class = QtKernelManager
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stylesheet = Unicode('', config=True,
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help="path to a custom CSS stylesheet")
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pure = CBool(False, config=True,
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help="Use a pure Python kernel instead of an IPython kernel.")
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plain = CBool(False, config=True,
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help="Use a plaintext widget instead of rich text (plain can't print/save).")
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def _pure_changed(self, name, old, new):
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kind = 'plain' if self.plain else 'rich'
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self.config.ConsoleWidget.kind = kind
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if self.pure:
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self.widget_factory = FrontendWidget
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elif self.plain:
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self.widget_factory = IPythonWidget
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else:
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self.widget_factory = RichIPythonWidget
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_plain_changed = _pure_changed
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confirm_exit = CBool(True, config=True,
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help="""
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Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
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to force a direct exit without any confirmation.""",
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)
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# the factory for creating a widget
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widget_factory = Any(RichIPythonWidget)
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def parse_command_line(self, argv=None):
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super(IPythonQtConsoleApp, self).parse_command_line(argv)
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if argv is None:
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argv = sys.argv[1:]
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self.kernel_argv = list(argv) # copy
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# kernel should inherit default config file from frontend
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self.kernel_argv.append("--KernelApp.parent_appname='%s'"%self.name)
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# Scrub frontend-specific flags
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swallow_next = False
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was_flag = False
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# copy again, in case some aliases have the same name as a flag
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# argv = list(self.kernel_argv)
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for a in argv:
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if swallow_next:
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swallow_next = False
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# last arg was an alias, remove the next one
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# *unless* the last alias has a no-arg flag version, in which
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# case, don't swallow the next arg if it's also a flag:
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if not (was_flag and a.startswith('-')):
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self.kernel_argv.remove(a)
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continue
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if a.startswith('-'):
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split = a.lstrip('-').split('=')
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alias = split[0]
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if alias in qt_aliases:
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self.kernel_argv.remove(a)
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if len(split) == 1:
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# alias passed with arg via space
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swallow_next = True
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# could have been a flag that matches an alias, e.g. `existing`
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# in which case, we might not swallow the next arg
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was_flag = alias in qt_flags
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elif alias in qt_flags:
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# strip flag, but don't swallow next, as flags don't take args
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self.kernel_argv.remove(a)
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def new_frontend_master(self):
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""" Create and return new frontend attached to new kernel, launched on localhost.
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"""
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ip = self.ip if self.ip in LOCAL_IPS else LOCALHOST
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kernel_manager = QtKernelManager(
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ip=ip,
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connection_file=self._new_connection_file(),
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config=self.config,
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)
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# start the kernel
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kwargs = dict(ipython=not self.pure)
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kwargs['extra_arguments'] = self.kernel_argv
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kernel_manager.start_kernel(**kwargs)
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kernel_manager.start_channels()
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widget = self.widget_factory(config=self.config,
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local_kernel=True)
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widget.kernel_manager = kernel_manager
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widget._existing = False
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widget._may_close = True
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widget._confirm_exit = self.confirm_exit
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return widget
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def new_frontend_slave(self, current_widget):
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"""Create and return a new frontend attached to an existing kernel.
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Parameters
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----------
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current_widget : IPythonWidget
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The IPythonWidget whose kernel this frontend is to share
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"""
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kernel_manager = QtKernelManager(
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connection_file=current_widget.kernel_manager.connection_file,
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config = self.config,
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)
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kernel_manager.load_connection_file()
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kernel_manager.start_channels()
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widget = self.widget_factory(config=self.config,
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local_kernel=False)
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widget._existing = True
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widget._may_close = False
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widget._confirm_exit = False
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widget.kernel_manager = kernel_manager
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return widget
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def init_qt_elements(self):
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# Create the widget.
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self.app = QtGui.QApplication([])
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base_path = os.path.abspath(os.path.dirname(__file__))
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icon_path = os.path.join(base_path, 'resources', 'icon', 'IPythonConsole.svg')
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self.app.icon = QtGui.QIcon(icon_path)
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QtGui.QApplication.setWindowIcon(self.app.icon)
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local_kernel = (not self.existing) or self.ip in LOCAL_IPS
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self.widget = self.widget_factory(config=self.config,
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local_kernel=local_kernel)
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self.widget._existing = self.existing
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self.widget._may_close = not self.existing
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self.widget._confirm_exit = self.confirm_exit
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self.widget.kernel_manager = self.kernel_manager
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self.window = MainWindow(self.app,
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confirm_exit=self.confirm_exit,
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new_frontend_factory=self.new_frontend_master,
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slave_frontend_factory=self.new_frontend_slave,
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)
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self.window.log = self.log
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self.window.add_tab_with_frontend(self.widget)
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self.window.init_menu_bar()
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self.window.setWindowTitle('Python' if self.pure else 'IPython')
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def init_colors(self):
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"""Configure the coloring of the widget"""
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# Note: This will be dramatically simplified when colors
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# are removed from the backend.
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if self.pure:
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# only IPythonWidget supports styling
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return
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# parse the colors arg down to current known labels
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try:
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colors = self.config.ZMQInteractiveShell.colors
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except AttributeError:
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colors = None
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try:
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style = self.config.IPythonWidget.syntax_style
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except AttributeError:
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style = None
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# find the value for colors:
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if colors:
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colors=colors.lower()
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if colors in ('lightbg', 'light'):
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colors='lightbg'
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elif colors in ('dark', 'linux'):
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colors='linux'
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else:
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colors='nocolor'
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elif style:
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if style=='bw':
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colors='nocolor'
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elif styles.dark_style(style):
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colors='linux'
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else:
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colors='lightbg'
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else:
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colors=None
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# Configure the style.
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widget = self.widget
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if style:
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widget.style_sheet = styles.sheet_from_template(style, colors)
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widget.syntax_style = style
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widget._syntax_style_changed()
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widget._style_sheet_changed()
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elif colors:
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# use a default style
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widget.set_default_style(colors=colors)
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else:
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# this is redundant for now, but allows the widget's
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# defaults to change
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widget.set_default_style()
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if self.stylesheet:
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# we got an expicit stylesheet
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if os.path.isfile(self.stylesheet):
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with open(self.stylesheet) as f:
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sheet = f.read()
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widget.style_sheet = sheet
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widget._style_sheet_changed()
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else:
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raise IOError("Stylesheet %r not found."%self.stylesheet)
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@catch_config_error
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def initialize(self, argv=None):
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super(IPythonQtConsoleApp, self).initialize(argv)
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self.init_connection_file()
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default_secure(self.config)
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self.init_ssh()
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self.init_kernel_manager()
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self.init_qt_elements()
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self.init_colors()
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def start(self):
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# draw the window
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self.window.show()
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# Start the application main loop.
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self.app.exec_()
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#-----------------------------------------------------------------------------
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# Main entry point
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#-----------------------------------------------------------------------------
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def main():
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app = IPythonQtConsoleApp()
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app.initialize()
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app.start()
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if __name__ == '__main__':
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main()
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