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""" A minimal application using the Qt console-style IPython 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.
Authors:
* Evan Patterson
* Min RK
* Erik Tollerud
* Fernando Perez
"""
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# stdlib imports
import os
import signal
import sys
from getpass import getpass
# System library imports
from IPython.external.qt import QtGui
from pygments.styles import get_all_styles
# external imports
from IPython.external.ssh import tunnel
# Local imports
from IPython.config.application import boolean_flag
from IPython.core.application import BaseIPythonApplication
from IPython.core.profiledir import ProfileDir
from IPython.frontend.qt.console.frontend_widget import FrontendWidget
from IPython.frontend.qt.console.ipython_widget import IPythonWidget
from IPython.frontend.qt.console.rich_ipython_widget import RichIPythonWidget
from IPython.frontend.qt.console import styles
from IPython.frontend.qt.kernelmanager import QtKernelManager
from IPython.parallel.util import select_random_ports
from IPython.utils.traitlets import (
Dict, List, Unicode, Int, CaselessStrEnum, CBool, Any
)
from IPython.zmq.ipkernel import (
flags as ipkernel_flags,
aliases as ipkernel_aliases,
IPKernelApp
)
from IPython.zmq.session import Session
from IPython.zmq.zmqshell import ZMQInteractiveShell
#-----------------------------------------------------------------------------
# Network Constants
#-----------------------------------------------------------------------------
from IPython.utils.localinterfaces import LOCALHOST, LOCAL_IPS
#-----------------------------------------------------------------------------
# Globals
#-----------------------------------------------------------------------------
_examples = """
ipython qtconsole # start the qtconsole
ipython qtconsole --pylab=inline # start with pylab in inline plotting mode
"""
#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
class MainWindow(QtGui.QMainWindow):
#---------------------------------------------------------------------------
# 'object' interface
#---------------------------------------------------------------------------
def __init__(self, app, frontend, existing=False, may_close=True,
confirm_exit=True):
""" Create a MainWindow for the specified FrontendWidget.
The app is passed as an argument to allow for different
closing behavior depending on whether we are the Kernel's parent.
If existing is True, then this Console does not own the Kernel.
If may_close is True, then this Console is permitted to close the kernel
"""
super(MainWindow, self).__init__()
self._app = app
self._frontend = frontend
self._existing = existing
if existing:
self._may_close = may_close
else:
self._may_close = True
self._frontend.exit_requested.connect(self.close)
self._confirm_exit = confirm_exit
self.setCentralWidget(frontend)
#---------------------------------------------------------------------------
# QWidget interface
#---------------------------------------------------------------------------
def closeEvent(self, event):
""" Close the window and the kernel (if necessary).
This will prompt the user if they are finished with the kernel, and if
so, closes the kernel cleanly. Alternatively, if the exit magic is used,
it closes without prompt.
"""
keepkernel = None #Use the prompt by default
if hasattr(self._frontend,'_keep_kernel_on_exit'): #set by exit magic
keepkernel = self._frontend._keep_kernel_on_exit
kernel_manager = self._frontend.kernel_manager
if keepkernel is None and not self._confirm_exit:
# don't prompt, just terminate the kernel if we own it
# or leave it alone if we don't
keepkernel = not self._existing
if keepkernel is None: #show prompt
if kernel_manager and kernel_manager.channels_running:
title = self.window().windowTitle()
cancel = QtGui.QMessageBox.Cancel
okay = QtGui.QMessageBox.Ok
if self._may_close:
msg = "You are closing this Console window."
info = "Would you like to quit the Kernel and all attached Consoles as well?"
justthis = QtGui.QPushButton("&No, just this Console", self)
justthis.setShortcut('N')
closeall = QtGui.QPushButton("&Yes, quit everything", self)
closeall.setShortcut('Y')
box = QtGui.QMessageBox(QtGui.QMessageBox.Question,
title, msg)
box.setInformativeText(info)
box.addButton(cancel)
box.addButton(justthis, QtGui.QMessageBox.NoRole)
box.addButton(closeall, QtGui.QMessageBox.YesRole)
box.setDefaultButton(closeall)
box.setEscapeButton(cancel)
reply = box.exec_()
if reply == 1: # close All
kernel_manager.shutdown_kernel()
#kernel_manager.stop_channels()
event.accept()
elif reply == 0: # close Console
if not self._existing:
# Have kernel: don't quit, just close the window
self._app.setQuitOnLastWindowClosed(False)
self.deleteLater()
event.accept()
else:
event.ignore()
else:
reply = QtGui.QMessageBox.question(self, title,
"Are you sure you want to close this Console?"+
"\nThe Kernel and other Consoles will remain active.",
okay|cancel,
defaultButton=okay
)
if reply == okay:
event.accept()
else:
event.ignore()
elif keepkernel: #close console but leave kernel running (no prompt)
if kernel_manager and kernel_manager.channels_running:
if not self._existing:
# I have the kernel: don't quit, just close the window
self._app.setQuitOnLastWindowClosed(False)
event.accept()
else: #close console and kernel (no prompt)
if kernel_manager and kernel_manager.channels_running:
kernel_manager.shutdown_kernel()
event.accept()
#-----------------------------------------------------------------------------
# Aliases and Flags
#-----------------------------------------------------------------------------
flags = dict(ipkernel_flags)
qt_flags = {
'existing' : ({'IPythonQtConsoleApp' : {'existing' : True}},
"Connect to an existing kernel."),
'pure' : ({'IPythonQtConsoleApp' : {'pure' : True}},
"Use a pure Python kernel instead of an IPython kernel."),
'plain' : ({'ConsoleWidget' : {'kind' : 'plain'}},
"Disable rich text support."),
}
qt_flags.update(boolean_flag(
'gui-completion', 'ConsoleWidget.gui_completion',
"use a GUI widget for tab completion",
"use plaintext output for completion"
))
qt_flags.update(boolean_flag(
'confirm-exit', 'IPythonQtConsoleApp.confirm_exit',
"""Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
to force a direct exit without any confirmation.
""",
"""Don't prompt the user when exiting. This will terminate the kernel
if it is owned by the frontend, and leave it alive if it is external.
"""
))
flags.update(qt_flags)
# the flags that are specific to the frontend
# these must be scrubbed before being passed to the kernel,
# or it will raise an error on unrecognized flags
qt_flags = qt_flags.keys()
aliases = dict(ipkernel_aliases)
qt_aliases = dict(
hb = 'IPythonQtConsoleApp.hb_port',
shell = 'IPythonQtConsoleApp.shell_port',
iopub = 'IPythonQtConsoleApp.iopub_port',
stdin = 'IPythonQtConsoleApp.stdin_port',
ip = 'IPythonQtConsoleApp.ip',
style = 'IPythonWidget.syntax_style',
stylesheet = 'IPythonQtConsoleApp.stylesheet',
colors = 'ZMQInteractiveShell.colors',
editor = 'IPythonWidget.editor',
paging = 'ConsoleWidget.paging',
ssh = 'IPythonQtConsoleApp.sshserver',
)
aliases.update(qt_aliases)
# also scrub aliases from the frontend
qt_flags.extend(qt_aliases.keys())
#-----------------------------------------------------------------------------
# IPythonQtConsole
#-----------------------------------------------------------------------------
class IPythonQtConsoleApp(BaseIPythonApplication):
name = 'ipython-qtconsole'
default_config_file_name='ipython_config.py'
description = """
The IPython 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.
The QtConsole supports various extra features beyond the Terminal IPython
shell, such as inline plotting with matplotlib, via:
ipython qtconsole --pylab=inline
as well as saving your session as HTML, and printing the output.
"""
examples = _examples
classes = [IPKernelApp, IPythonWidget, ZMQInteractiveShell, ProfileDir, Session]
flags = Dict(flags)
aliases = Dict(aliases)
kernel_argv = List(Unicode)
# create requested profiles by default, if they don't exist:
auto_create = CBool(True)
# connection info:
ip = Unicode(LOCALHOST, config=True,
help="""Set the kernel\'s IP address [default localhost].
If the IP address is something other than localhost, then
Consoles on other machines will be able to connect
to the Kernel, so be careful!"""
)
sshserver = Unicode('', config=True,
help="""The SSH server to use to connect to the kernel.""")
sshkey = Unicode('', config=True,
help="""Path to the ssh key to use for logging in to the ssh server.""")
hb_port = Int(0, config=True,
help="set the heartbeat port [default: random]")
shell_port = Int(0, config=True,
help="set the shell (XREP) port [default: random]")
iopub_port = Int(0, config=True,
help="set the iopub (PUB) port [default: random]")
stdin_port = Int(0, config=True,
help="set the stdin (XREQ) port [default: random]")
existing = CBool(False, config=True,
help="Whether to connect to an already running Kernel.")
stylesheet = Unicode('', config=True,
help="path to a custom CSS stylesheet")
pure = CBool(False, config=True,
help="Use a pure Python kernel instead of an IPython kernel.")
plain = CBool(False, config=True,
help="Use a plaintext widget instead of rich text (plain can't print/save).")
def _pure_changed(self, name, old, new):
kind = 'plain' if self.plain else 'rich'
self.config.ConsoleWidget.kind = kind
if self.pure:
self.widget_factory = FrontendWidget
elif self.plain:
self.widget_factory = IPythonWidget
else:
self.widget_factory = RichIPythonWidget
_plain_changed = _pure_changed
confirm_exit = CBool(True, config=True,
help="""
Set to display confirmation dialog on exit. You can always use 'exit' or 'quit',
to force a direct exit without any confirmation.""",
)
# the factory for creating a widget
widget_factory = Any(RichIPythonWidget)
def parse_command_line(self, argv=None):
super(IPythonQtConsoleApp, self).parse_command_line(argv)
if argv is None:
argv = sys.argv[1:]
self.kernel_argv = list(argv) # copy
# kernel should inherit default config file from frontend
self.kernel_argv.append("--KernelApp.parent_appname='%s'"%self.name)
# scrub frontend-specific flags
for a in argv:
if a.startswith('-'):
key = a.lstrip('-').split('=')[0]
if key in qt_flags:
self.kernel_argv.remove(a)
def init_ssh(self):
"""set up ssh tunnels, if needed."""
if not self.sshserver and not self.sshkey:
return
if self.sshkey and not self.sshserver:
self.sshserver = self.ip
self.ip=LOCALHOST
lports = select_random_ports(4)
rports = self.shell_port, self.iopub_port, self.stdin_port, self.hb_port
self.shell_port, self.iopub_port, self.stdin_port, self.hb_port = lports
remote_ip = self.ip
self.ip = LOCALHOST
self.log.info("Forwarding connections to %s via %s"%(remote_ip, self.sshserver))
if tunnel.try_passwordless_ssh(self.sshserver, self.sshkey):
password=False
else:
password = getpass("SSH Password for %s: "%self.sshserver)
for lp,rp in zip(lports, rports):
tunnel.ssh_tunnel(lp, rp, self.sshserver, remote_ip, self.sshkey, password)
def init_kernel_manager(self):
# Don't let Qt or ZMQ swallow KeyboardInterupts.
signal.signal(signal.SIGINT, signal.SIG_DFL)
# Create a KernelManager and start a kernel.
self.kernel_manager = QtKernelManager(
shell_address=(self.ip, self.shell_port),
sub_address=(self.ip, self.iopub_port),
stdin_address=(self.ip, self.stdin_port),
hb_address=(self.ip, self.hb_port),
config=self.config
)
# start the kernel
if not self.existing:
kwargs = dict(ip=self.ip, ipython=not self.pure)
kwargs['extra_arguments'] = self.kernel_argv
self.kernel_manager.start_kernel(**kwargs)
self.kernel_manager.start_channels()
def init_qt_elements(self):
# Create the widget.
self.app = QtGui.QApplication([])
local_kernel = (not self.existing) or self.ip in LOCAL_IPS
self.widget = self.widget_factory(config=self.config,
local_kernel=local_kernel)
self.widget.kernel_manager = self.kernel_manager
self.window = MainWindow(self.app, self.widget, self.existing,
may_close=local_kernel,
confirm_exit=self.confirm_exit)
self.window.setWindowTitle('Python' if self.pure else 'IPython')
def init_colors(self):
"""Configure the coloring of the widget"""
# Note: This will be dramatically simplified when colors
# are removed from the backend.
if self.pure:
# only IPythonWidget supports styling
return
# parse the colors arg down to current known labels
try:
colors = self.config.ZMQInteractiveShell.colors
except AttributeError:
colors = None
try:
style = self.config.IPythonWidget.colors
except AttributeError:
style = 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.
widget = self.widget
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 style
widget.set_default_style(colors=colors)
else:
# this is redundant for now, but allows the widget's
# defaults to change
widget.set_default_style()
if self.stylesheet:
# we got an expicit stylesheet
if os.path.isfile(self.stylesheet):
with open(self.stylesheet) as f:
sheet = f.read()
widget.style_sheet = sheet
widget._style_sheet_changed()
else:
raise IOError("Stylesheet %r not found."%self.stylesheet)
def initialize(self, argv=None):
super(IPythonQtConsoleApp, self).initialize(argv)
self.init_ssh()
self.init_kernel_manager()
self.init_qt_elements()
self.init_colors()
self.init_window_shortcut()
def init_window_shortcut(self):
fullScreenAction = QtGui.QAction('Toggle Full Screen', self.window)
fullScreenAction.setShortcut('Ctrl+Meta+Space')
fullScreenAction.triggered.connect(self.toggleFullScreen)
self.window.addAction(fullScreenAction)
def toggleFullScreen(self):
if not self.window.isFullScreen():
self.window.showFullScreen()
else:
self.window.showNormal()
def start(self):
# draw the window
self.window.show()
# Start the application main loop.
self.app.exec_()
#-----------------------------------------------------------------------------
# Main entry point
#-----------------------------------------------------------------------------
def main():
app = IPythonQtConsoleApp()
app.initialize()
app.start()
if __name__ == '__main__':
main()
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