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new completer for qtconsole...
new completer for qtconsole add a completer to the qtconsole that is navigable by arrows keys and tab. One need to call it twice to get it on focus and be able to select completion with Return. looks like zsh completer, not the gui drop down list of --gui-completer. This also try to split the completion logic from console_widget, and try to keep the old completer qui around. The plain completer that never takes focus back, and the QlistWidget completer. to switch between the 3, the --gui-completion flag as been changed to take an argument (plain, droplist, ncurses) completer also autoscroll and show `...` when rows are hidden
Matthias BUSSONNIER - - Load All Authors

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qtconsoleapp.py
368 lines | 12.6 KiB | text/x-python | PythonLexer
/ IPython / frontend / qt / console / qtconsoleapp.py
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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
* Bussonnier Matthias
* Thomas Kluyver
* Paul Ivanov
"""
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# stdlib imports
import json
import os
import signal
import sys
import uuid
# If run on Windows, 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).
if os.name == 'nt':
old_excepthook = sys.excepthook
def gui_excepthook(exctype, value, tb):
try:
import ctypes, traceback
MB_ICONERROR = 0x00000010L
title = u'Error starting IPython 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
# System library imports
from IPython.external.qt import QtCore, QtGui
# Local imports
from IPython.config.application import boolean_flag, catch_config_error
from IPython.core.application import BaseIPythonApplication
from IPython.core.profiledir import ProfileDir
from IPython.lib.kernel import tunnel_to_kernel, find_connection_file
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.console.mainwindow import MainWindow
from IPython.frontend.qt.kernelmanager import QtKernelManager
from IPython.utils.path import filefind
from IPython.utils.py3compat import str_to_bytes
from IPython.utils.traitlets import (
Dict, List, Unicode, Integer, CaselessStrEnum, CBool, Any
)
from IPython.zmq.ipkernel import IPKernelApp
from IPython.zmq.session import Session, default_secure
from IPython.zmq.zmqshell import ZMQInteractiveShell
from IPython.frontend.consoleapp import (
IPythonConsoleApp, app_aliases, app_flags, flags, aliases
)
#-----------------------------------------------------------------------------
# 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
"""
#-----------------------------------------------------------------------------
# Aliases and Flags
#-----------------------------------------------------------------------------
# start with copy of flags
flags = dict(flags)
qt_flags = {
'plain' : ({'IPythonQtConsoleApp' : {'plain' : True}},
"Disable rich text support."),
}
# 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 front&backend aliases list
aliases = dict(aliases)
qt_aliases = dict(
style = 'IPythonWidget.syntax_style',
stylesheet = 'IPythonQtConsoleApp.stylesheet',
colors = 'ZMQInteractiveShell.colors',
editor = 'IPythonWidget.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_aliases.remove('colors')
qt_flags = set(qt_flags.keys())
#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# IPythonQtConsole
#-----------------------------------------------------------------------------
class IPythonQtConsoleApp(BaseIPythonApplication, IPythonConsoleApp):
name = 'ipython-qtconsole'
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 = [IPythonWidget] + IPythonConsoleApp.classes
flags = Dict(flags)
aliases = Dict(aliases)
frontend_flags = Any(qt_flags)
frontend_aliases = Any(qt_aliases)
kernel_manager_class = QtKernelManager
stylesheet = Unicode('', config=True,
help="path to a custom CSS stylesheet")
plain = CBool(False, config=True,
help="Use a plaintext widget instead of rich text (plain can't print/save).")
def _plain_changed(self, name, old, new):
kind = 'plain' if new else 'rich'
self.config.ConsoleWidget.kind = kind
if new:
self.widget_factory = IPythonWidget
else:
self.widget_factory = RichIPythonWidget
# the factory for creating a widget
widget_factory = Any(RichIPythonWidget)
def parse_command_line(self, argv=None):
super(IPythonQtConsoleApp, self).parse_command_line(argv)
self.build_kernel_argv(argv)
def new_frontend_master(self):
""" Create and return new frontend attached to new kernel, launched on localhost.
"""
ip = self.ip if self.ip in LOCAL_IPS else LOCALHOST
kernel_manager = self.kernel_manager_class(
ip=ip,
connection_file=self._new_connection_file(),
config=self.config,
)
# start the kernel
kwargs = dict()
kwargs['extra_arguments'] = self.kernel_argv
kernel_manager.start_kernel(**kwargs)
kernel_manager.start_channels()
widget = self.widget_factory(config=self.config,
local_kernel=True)
self.init_colors(widget)
widget.kernel_manager = kernel_manager
widget._existing = False
widget._may_close = True
widget._confirm_exit = self.confirm_exit
return widget
def new_frontend_slave(self, current_widget):
"""Create and return a new frontend attached to an existing kernel.
Parameters
----------
current_widget : IPythonWidget
The IPythonWidget whose kernel this frontend is to share
"""
kernel_manager = self.kernel_manager_class(
connection_file=current_widget.kernel_manager.connection_file,
config = self.config,
)
kernel_manager.load_connection_file()
kernel_manager.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.kernel_manager = kernel_manager
return widget
def init_qt_elements(self):
# Create the widget.
self.app = QtGui.QApplication([])
base_path = os.path.abspath(os.path.dirname(__file__))
icon_path = os.path.join(base_path, 'resources', 'icon', 'IPythonConsole.svg')
self.app.icon = QtGui.QIcon(icon_path)
QtGui.QApplication.setWindowIcon(self.app.icon)
local_kernel = (not self.existing) or self.ip in LOCAL_IPS
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.kernel_manager = self.kernel_manager
self.window = MainWindow(self.app,
confirm_exit=self.confirm_exit,
new_frontend_factory=self.new_frontend_master,
slave_frontend_factory=self.new_frontend_slave,
)
self.window.log = self.log
self.window.add_tab_with_frontend(self.widget)
self.window.init_menu_bar()
self.window.setWindowTitle('IPython')
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
try:
colors = self.config.ZMQInteractiveShell.colors
except AttributeError:
colors = None
try:
style = self.config.IPythonWidget.syntax_style
except AttributeError:
style = None
try:
sheet = self.config.IPythonWidget.style_sheet
except AttributeError:
sheet = 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
@catch_config_error
def initialize(self, argv=None):
super(IPythonQtConsoleApp, self).initialize(argv)
IPythonConsoleApp.initialize(self,argv)
self.init_qt_elements()
self.init_signal()
def start(self):
# draw the window
self.window.show()
self.window.raise_()
# Start the application main loop.
self.app.exec_()
#-----------------------------------------------------------------------------
# Main entry point
#-----------------------------------------------------------------------------
def main():
app = IPythonQtConsoleApp()
app.initialize()
app.start()
if __name__ == '__main__':
main()