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""" A minimal application using the Qt console-style IPython frontend.
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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 os
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import signal
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import sys
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# System library imports
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from IPython.external.qt import QtGui
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from pygments.styles import get_all_styles
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# Local imports
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from IPython.config.application import boolean_flag
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from IPython.core.newapplication import ProfileDir, BaseIPythonApplication
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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.kernelmanager import QtKernelManager
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from IPython.utils.traitlets import (
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Dict, List, Unicode, Int, CaselessStrEnum, CBool, Any
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)
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from IPython.zmq.ipkernel import (
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flags as ipkernel_flags,
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aliases as ipkernel_aliases,
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IPKernelApp
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)
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from IPython.zmq.zmqshell import ZMQInteractiveShell
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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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# Classes
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#-----------------------------------------------------------------------------
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class MainWindow(QtGui.QMainWindow):
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#---------------------------------------------------------------------------
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# 'object' interface
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#---------------------------------------------------------------------------
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def __init__(self, app, frontend, existing=False, may_close=True,
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confirm_exit=True):
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""" Create a MainWindow for the specified FrontendWidget.
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The app is passed as an argument to allow for different
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closing behavior depending on whether we are the Kernel's parent.
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If existing is True, then this Console does not own the Kernel.
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If may_close is True, then this Console is permitted to close the kernel
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"""
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super(MainWindow, self).__init__()
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self._app = app
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self._frontend = frontend
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self._existing = existing
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if existing:
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self._may_close = may_close
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else:
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self._may_close = True
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self._frontend.exit_requested.connect(self.close)
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self._confirm_exit = confirm_exit
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self.setCentralWidget(frontend)
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#---------------------------------------------------------------------------
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# QWidget interface
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#---------------------------------------------------------------------------
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def closeEvent(self, event):
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""" Close the window and the kernel (if necessary).
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This will prompt the user if they are finished with the kernel, and if
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so, closes the kernel cleanly. Alternatively, if the exit magic is used,
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it closes without prompt.
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"""
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keepkernel = None #Use the prompt by default
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if hasattr(self._frontend,'_keep_kernel_on_exit'): #set by exit magic
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keepkernel = self._frontend._keep_kernel_on_exit
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kernel_manager = self._frontend.kernel_manager
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if keepkernel is None and not self._confirm_exit:
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# don't prompt, just terminate the kernel if we own it
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# or leave it alone if we don't
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keepkernel = not self._existing
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if keepkernel is None: #show prompt
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if kernel_manager and kernel_manager.channels_running:
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title = self.window().windowTitle()
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cancel = QtGui.QMessageBox.Cancel
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okay = QtGui.QMessageBox.Ok
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if self._may_close:
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msg = "You are closing this Console window."
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info = "Would you like to quit the Kernel and all attached Consoles as well?"
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justthis = QtGui.QPushButton("&No, just this Console", self)
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justthis.setShortcut('N')
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closeall = QtGui.QPushButton("&Yes, quit everything", self)
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closeall.setShortcut('Y')
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box = QtGui.QMessageBox(QtGui.QMessageBox.Question,
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title, msg)
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box.setInformativeText(info)
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box.addButton(cancel)
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box.addButton(justthis, QtGui.QMessageBox.NoRole)
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box.addButton(closeall, QtGui.QMessageBox.YesRole)
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box.setDefaultButton(closeall)
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box.setEscapeButton(cancel)
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reply = box.exec_()
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if reply == 1: # close All
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kernel_manager.shutdown_kernel()
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#kernel_manager.stop_channels()
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event.accept()
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elif reply == 0: # close Console
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if not self._existing:
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# Have kernel: don't quit, just close the window
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self._app.setQuitOnLastWindowClosed(False)
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self.deleteLater()
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event.accept()
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else:
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event.ignore()
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else:
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reply = QtGui.QMessageBox.question(self, title,
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"Are you sure you want to close this Console?"+
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"\nThe Kernel and other Consoles will remain active.",
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okay|cancel,
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defaultButton=okay
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)
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if reply == okay:
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event.accept()
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else:
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event.ignore()
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elif keepkernel: #close console but leave kernel running (no prompt)
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if kernel_manager and kernel_manager.channels_running:
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if not self._existing:
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# I have the kernel: don't quit, just close the window
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self._app.setQuitOnLastWindowClosed(False)
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event.accept()
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else: #close console and kernel (no prompt)
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if kernel_manager and kernel_manager.channels_running:
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kernel_manager.shutdown_kernel()
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event.accept()
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#-----------------------------------------------------------------------------
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# Aliases and Flags
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#-----------------------------------------------------------------------------
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flags = dict(ipkernel_flags)
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flags.update({
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'existing' : ({'IPythonQtConsoleApp' : {'existing' : True}},
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"Connect to an existing kernel."),
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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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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(boolean_flag(
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'confirm-exit', 'IPythonQtConsoleApp.confirm_exit',
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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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"""Don't prompt the user when exiting. This will terminate the kernel
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if it is owned by the frontend, and leave it alive if it is external.
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"""
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))
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# the flags that are specific to the frontend
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# these must be scrubbed before being passed to the kernel,
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# or it will raise an error on unrecognized flags
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qt_flags = ['existing', 'pure', 'plain', 'gui-completion', 'no-gui-completion',
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'confirm-exit', 'no-confirm-exit']
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aliases = dict(ipkernel_aliases)
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aliases.update(dict(
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hb = 'IPythonQtConsoleApp.hb_port',
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shell = 'IPythonQtConsoleApp.shell_port',
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iopub = 'IPythonQtConsoleApp.iopub_port',
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stdin = 'IPythonQtConsoleApp.stdin_port',
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ip = 'IPythonQtConsoleApp.ip',
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plain = 'IPythonQtConsoleApp.plain',
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pure = 'IPythonQtConsoleApp.pure',
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gui_completion = 'ConsoleWidget.gui_completion',
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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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pi = 'IPythonWidget.in_prompt',
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po = 'IPythonWidget.out_prompt',
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si = 'IPythonWidget.input_sep',
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so = 'IPythonWidget.output_sep',
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so2 = 'IPythonWidget.output_sep2',
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))
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#-----------------------------------------------------------------------------
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# IPythonQtConsole
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#-----------------------------------------------------------------------------
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class IPythonQtConsoleApp(BaseIPythonApplication):
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name = 'ipython-qtconsole'
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default_config_file_name='ipython_config.py'
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classes = [IPKernelApp, IPythonWidget, ZMQInteractiveShell, ProfileDir]
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flags = Dict(flags)
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aliases = Dict(aliases)
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kernel_argv = List(Unicode)
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# connection info:
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ip = Unicode(LOCALHOST, config=True,
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help="""Set the kernel\'s IP address [default localhost].
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If the IP address is something other than localhost, then
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Consoles on other machines will be able to connect
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to the Kernel, so be careful!"""
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)
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hb_port = Int(0, config=True,
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help="set the heartbeat port [default: random]")
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shell_port = Int(0, config=True,
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help="set the shell (XREP) port [default: random]")
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iopub_port = Int(0, config=True,
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help="set the iopub (PUB) port [default: random]")
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stdin_port = Int(0, config=True,
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help="set the stdin (XREQ) port [default: random]")
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existing = CBool(False, config=True,
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help="Whether to connect to an already running Kernel.")
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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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# scrub frontend-specific flags
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for a in argv:
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if a.startswith('--') and a[2:] in qt_flags:
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self.kernel_argv.remove(a)
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def init_kernel_manager(self):
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# Don't let Qt or ZMQ swallow KeyboardInterupts.
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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# Create a KernelManager and start a kernel.
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self.kernel_manager = QtKernelManager(
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shell_address=(self.ip, self.shell_port),
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sub_address=(self.ip, self.iopub_port),
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stdin_address=(self.ip, self.stdin_port),
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hb_address=(self.ip, self.hb_port)
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)
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# start the kernel
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if not self.existing:
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kwargs = dict(ip=self.ip, ipython=not self.pure)
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kwargs['extra_arguments'] = self.kernel_argv
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self.kernel_manager.start_kernel(**kwargs)
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self.kernel_manager.start_channels()
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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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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.kernel_manager = self.kernel_manager
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self.window = MainWindow(self.app, self.widget, self.existing,
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may_close=local_kernel,
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confirm_exit=self.confirm_exit)
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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.colors
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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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def initialize(self, argv=None):
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super(IPythonQtConsoleApp, self).initialize(argv)
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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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