remove old comment no longer usefull

IPython/frontend/qt/console/qtconsoleapp.py

@@ -1,1165 +1,1162 b''
 """ 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 json
 import os
 import signal
 import sys
 import webbrowser
 from getpass import getpass
 
 # System library imports
 from IPython.external.qt import QtGui,QtCore
 from pygments.styles import get_all_styles
 
 # Local imports
 from IPython.config.application import boolean_flag
 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.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, Int, CaselessStrEnum, CBool, Any
 )
 from IPython.zmq.ipkernel import (
     flags as ipkernel_flags,
     aliases as ipkernel_aliases,
     IPKernelApp
 )
 from IPython.zmq.session import Session, default_secure
 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.tab_widget = QtGui.QTabWidget(self)
         self.tab_widget.setDocumentMode(True)
         self.tab_widget.setTabsClosable(True)
         self.tab_widget.tabCloseRequested[int].connect(self.close_tab)
 
         self.setCentralWidget(self.tab_widget)
         self.update_tab_bar_visibility()
 
     def update_tab_bar_visibility(self):
         """ update visibility of the tabBar depending of the number of tab
 
         0 or 1 tab, tabBar hidden
         2+ tabs, tabBar visible
 
         send a self.close if number of tab ==0
 
         need to be called explicitely, or be connected to tabInserted/tabRemoved
         """
         if self.tab_widget.count() <= 1:
             self.tab_widget.tabBar().setVisible(False)
         else:
             self.tab_widget.tabBar().setVisible(True)
         if self.tab_widget.count()==0 :
             self.close()
 
     @property
     def active_frontend(self):
         return self.tab_widget.currentWidget()
 
     def close_tab(self,current_tab):
         """ Called when you need to try to close a tab.
 
         It takes the number of the tab to be closed as argument, or a referece
         to the wiget insite this tab
         """
 
         # let's be sure "tab" and "closing widget are respectivey the index of the tab to close
         # and a reference to the trontend to close
         if type(current_tab) is not int :
             current_tab = self.tab_widget.indexOf(current_tab)
         closing_widget=self.tab_widget.widget(current_tab)
 
 
         # when trying to be closed, widget might re-send a request to be closed again, but will
         # be deleted when event will be processed. So need to check that widget still exist and
         # skip if not. One example of this is when 'exit' is send in a slave tab. 'exit' will be
         # re-send by this fonction on the master widget, which ask all slaves widget to exit
         if closing_widget==None:
             return
 
         #get a list of all wwidget not owning the kernel.
         slave_tabs=self.find_slaves_tabs(closing_widget)
 
         keepkernel = None #Use the prompt by default
         if hasattr(closing_widget,'_keep_kernel_on_exit'): #set by exit magic
             keepkernel = closing_widget._keep_kernel_on_exit
             # If signal sent by exist magic (_keep_kernel_on_exit, exist and not None)
             # we set local slave tabs._hidden to True to avoit prompting for kernel
             # restart when they litt get the signal. and the "forward" the 'exit'
             # to the main win
             if keepkernel is not None:
                 for tab in slave_tabs:
                     tab._hidden = True
                 if closing_widget in slave_tabs :
                     try :
                         self.find_master_tab(closing_widget).execute('exit')
                     except AttributeError:
                         self.log.info("Master already closed or not local, closing only current tab")
                         self.tab_widget.removeTab(current_tab)
                     return
 
         kernel_manager = closing_widget.kernel_manager
 
         if keepkernel is None and not closing_widget._confirm_exit:
             # don't prompt, just terminate the kernel if we own it
             # or leave it alone if we don't
             keepkernel = not closing_widget._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 closing_widget._may_close:
                     msg = "You are closing the tab : "+'"'+self.tab_widget.tabText(current_tab)+'"'
                     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)
                     pixmap = QtGui.QPixmap(self._app.icon.pixmap(QtCore.QSize(64,64)))
                     box.setIconPixmap(pixmap)
                     reply = box.exec_()
                     if reply == 1: # close All
                         for slave in slave_tabs:
                             self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                         closing_widget.execute("exit")
                         self.tab_widget.removeTab(current_tab)
                     elif reply == 0: # close Console
                         if not closing_widget._existing:
                             # Have kernel: don't quit, just close the window
                             self._app.setQuitOnLastWindowClosed(False)
                             closing_widget.execute("exit True")
                 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:
                         self.tab_widget.removeTab(current_tab)
         elif keepkernel: #close console but leave kernel running (no prompt)
             if kernel_manager and kernel_manager.channels_running:
                 if not closing_widget._existing:
                     # I have the kernel: don't quit, just close the window
                     self.tab_widget.removeTab(current_tab)
         else: #close console and kernel (no prompt)
             if kernel_manager and kernel_manager.channels_running:
                 for slave in slave_tabs:
                     self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                 self.tab_widget.removeTab(current_tab)
                 kernel_manager.shutdown_kernel()
         self.update_tab_bar_visibility()
 
     def add_tab_with_frontend(self,frontend,name=None):
         """ insert a tab with a given frontend in the tab bar, and give it a name
 
         """
         if not name:
             name=str('kernel '+str(self.tab_widget.count()))
         self.tab_widget.addTab(frontend,name)
         self.update_tab_bar_visibility()
         self.make_frontend_visible(frontend)
         frontend.exit_requested.connect(self.close_tab)
 
     def next_tab(self):
         self.tab_widget.setCurrentIndex((self.tab_widget.currentIndex()+1))
 
     def prev_tab(self):
         self.tab_widget.setCurrentIndex((self.tab_widget.currentIndex()-1))
 
     def make_frontend_visible(self,frontend):
         widget_index=self.tab_widget.indexOf(frontend)
         if widget_index > 0 :
             self.tab_widget.setCurrentIndex(widget_index)
 
     def find_master_tab(self,tab,as_list=False):
         """
         Try to return the frontend that own the kernel attached to the given widget/tab.
 
             Only find frontend owed by the current application. Selection
             based on port of the kernel, might be inacurate if several kernel
             on different ip use same port number.
 
             This fonction does the conversion tabNumber/widget if needed.
             Might return None if no master widget (non local kernel)
             Will crash IPython if more than 1 masterWidget
 
             When asList set to True, always return a list of widget(s) owning
             the kernel. The list might be empty or containing several Widget.
         """
 
         #convert from/to int/richIpythonWidget if needed
         if type(tab) == int:
             tab = self.tab_widget.widget(tab)
         km=tab.kernel_manager;
 
         #build list of all widgets
         widget_list = [self.tab_widget.widget(i) for i in range(self.tab_widget.count())]
 
         # widget that are candidate to be the owner of the kernel does have all the same port of the curent widget
         # And should have a _may_close attribute
         filtred_widget_list = [ widget for widget in widget_list if
                                 widget.kernel_manager.shell_address == km.shell_address and
                                 widget.kernel_manager.sub_address   == km.sub_address and
                                 widget.kernel_manager.stdin_address == km.stdin_address and
                                 widget.kernel_manager.hb_address    == km.hb_address and
                                 hasattr(widget,'_may_close') ]
         # the master widget is the one that may close the kernel
         master_widget= [ widget for widget in filtred_widget_list if widget._may_close]
         if as_list:
             return master_widget
         assert(len(master_widget)<=1 )
         if len(master_widget)==0:
             return None
 
         return master_widget[0]
 
     def find_slaves_tabs(self,tab):
         """
         Try to return all the frontend that do not own the kernel attached to the given widget/tab.
 
             Only find frontend owed by the current application. Selection
             based on port of the kernel, might be innacurate if several kernel
             on different ip use same port number.
 
             This fonction does the conversion tabNumber/widget if needed.
         """
         #convert from/to int/richIpythonWidget if needed
         if type(tab) == int:
             tab = self.tab_widget.widget(tab)
         km=tab.kernel_manager;
 
         #build list of all widgets
         widget_list = [self.tab_widget.widget(i) for i in range(self.tab_widget.count())]
 
         # widget that are candidate not to be the owner of the kernel does have all the same port of the curent widget
         filtered_widget_list = ( widget for widget in widget_list if
                                 widget.kernel_manager.shell_address == km.shell_address and
                                 widget.kernel_manager.sub_address   == km.sub_address and
                                 widget.kernel_manager.stdin_address == km.stdin_address and
                                 widget.kernel_manager.hb_address    == km.hb_address)
         # Get a list of all widget owning the same kernel and removed it from
         # the previous cadidate. (better using sets ?)
         master_widget_list = self.find_master_tab(tab,as_list=True)
         slave_list = [widget for widget in filtered_widget_list if widget not in master_widget_list]
 
         return slave_list
 
     # MenuBar is always present on Mac Os, so let's populate it with possible
     # action, don't do it on other platform as some user might not want the
     # menu bar, or give them an option to remove it
     def init_menu_bar(self):
         #create menu in the order they should appear in the menu bar
         self.file_menu = self.menuBar().addMenu("&File")
         self.edit_menu = self.menuBar().addMenu("&Edit")
         self.window_menu = self.menuBar().addMenu("&Window")
         self.magic_menu = self.menuBar().addMenu("&Magic")
         self.all_magic_menu = self.magic_menu.addMenu("&All Magic")
 
         # please keep the Help menu in Mac Os even if empty. It will
         # automatically contain a search field to search inside menus and
         # please keep it spelled in English, as long as Qt Doesn't support
         # a QAction.MenuRole like HelpMenuRole otherwise it will loose
         # this search field fonctionnality
 
         self.help_menu = self.menuBar().addMenu("&Help")
 
-        # sould wrap every line of the following block into a try/except,
-        # as we are not sure of instanciating a _frontend which support all
-        # theses actions, but there might be a better way
         self.print_action = QtGui.QAction("&Print",
             self,
             shortcut="Ctrl+P",
             triggered=self.print_action_active_frontend)
         self.file_menu.addAction(self.print_action)
 
         self.export_action=QtGui.QAction("E&xport",
             self,
             shortcut="Ctrl+S",
             triggered=self.export_action_active_frontend
             )
         self.file_menu.addAction(self.export_action)
 
         self.select_all_action = QtGui.QAction("Select &All",
             self,
             shortcut="Ctrl+A",
             triggered=self.select_all_active_frontend
             )
         self.file_menu.addAction(self.select_all_action)
 
         self.paste_action = QtGui.QAction("&Paste",
             self,
             shortcut=QtGui.QKeySequence.Paste,
             triggered=self.paste_active_frontend
             )
         self.edit_menu.addAction(self.paste_action)
 
         self.copy_action = QtGui.QAction("&Copy",
             self,
             shortcut=QtGui.QKeySequence.Copy,
             triggered=self.copy_active_frontend
             )
         self.edit_menu.addAction(self.copy_action)
 
         self.cut_action = QtGui.QAction("&Cut",
             self,
             shortcut=QtGui.QKeySequence.Cut,
             triggered=self.cut_active_frontend
             )
         self.edit_menu.addAction(self.cut_action)
 
         self.edit_menu.addSeparator()
 
         self.undo_action = QtGui.QAction("&Undo",
             self,
             shortcut="Ctrl+Z",
             statusTip="Undo last action if possible",
             triggered=self.undo_active_frontend
             )
         self.edit_menu.addAction(self.undo_action)
 
         self.redo_action = QtGui.QAction("&Redo",
             self,
             shortcut="Ctrl+Shift+Z",
             statusTip="Redo last action if possible",
             triggered=self.redo_active_frontend)
         self.edit_menu.addAction(self.redo_action)
 
         self.window_menu.addSeparator()
 
         self.increase_font_size = QtGui.QAction("&Increase Font Size",
             self,
             shortcut="Ctrl++",
             triggered=self.increase_font_size_active_frontend
             )
         self.window_menu.addAction(self.increase_font_size)
 
         self.decrease_font_size = QtGui.QAction("&Decrease Font Size",
             self,
             shortcut="Ctrl+-",
             triggered=self.decrease_font_size_active_frontend
             )
         self.window_menu.addAction(self.decrease_font_size)
 
         self.reset_font_size = QtGui.QAction("&Reset Font Size",
             self,
             shortcut="Ctrl+0",
             triggered=self.reset_font_size_active_frontend
             )
         self.window_menu.addAction(self.reset_font_size)
 
         self.window_menu.addSeparator()
 
         self.reset_action = QtGui.QAction("&Reset",
             self,
             statusTip="Clear all varible from workspace",
             triggered=self.reset_magic_active_frontend)
         self.magic_menu.addAction(self.reset_action)
 
         self.history_action = QtGui.QAction("&History",
             self,
             statusTip="show command history",
             triggered=self.history_magic_active_frontend)
         self.magic_menu.addAction(self.history_action)
 
         self.save_action = QtGui.QAction("E&xport History ",
             self,
             statusTip="Export History as Python File",
             triggered=self.save_magic_active_frontend)
         self.magic_menu.addAction(self.save_action)
 
         self.clear_action = QtGui.QAction("&Clear Screen",
             self,
             shortcut='Ctrl+L',
             statusTip="Clear the console",
             triggered=self.clear_magic_active_frontend)
         self.window_menu.addAction(self.clear_action)
 
         self.who_action = QtGui.QAction("&Who",
             self,
             statusTip="List interactive variable",
             triggered=self.who_magic_active_frontend)
         self.magic_menu.addAction(self.who_action)
 
         self.who_ls_action = QtGui.QAction("Wh&o ls",
             self,
             statusTip="Return a list of interactive variable",
             triggered=self.who_ls_magic_active_frontend)
         self.magic_menu.addAction(self.who_ls_action)
 
         self.whos_action = QtGui.QAction("Who&s",
             self,
             statusTip="List interactive variable with detail",
             triggered=self.whos_magic_active_frontend)
         self.magic_menu.addAction(self.whos_action)
 
         self.intro_active_frontend_action = QtGui.QAction("Intro",
             self,
             triggered=self.intro_active_frontend
             )
         self.help_menu.addAction(self.intro_active_frontend_action)
 
         self.guiref_active_frontend_action = QtGui.QAction("Gui references",
             self,
             triggered=self.guiref_active_frontend
             )
         self.help_menu.addAction(self.guiref_active_frontend_action)
 
         self.quickref_active_frontend_action = QtGui.QAction("Quick references",
             self,
             triggered=self.quickref_active_frontend
             )
         self.help_menu.addAction(self.quickref_active_frontend_action)
 
         magiclist=["%alias", "%autocall", "%automagic", "%bookmark", "%cd", "%clear",
             "%colors", "%debug", "%dhist", "%dirs", "%doctest_mode", "%ed", "%edit", "%env", "%gui",
             "%guiref", "%hist", "%history", "%install_default_config", "%install_profiles",
             "%less", "%load_ext", "%loadpy", "%logoff", "%logon", "%logstart", "%logstate",
             "%logstop", "%lsmagic", "%macro", "%magic", "%man", "%more", "%notebook", "%page",
             "%pastebin", "%pdb", "%pdef", "%pdoc", "%pfile", "%pinfo", "%pinfo2", "%popd", "%pprint",
             "%precision", "%profile", "%prun", "%psearch", "%psource", "%pushd", "%pwd", "%pycat",
             "%pylab", "%quickref", "%recall", "%rehashx", "%reload_ext", "%rep", "%rerun",
             "%reset", "%reset_selective", "%run", "%save", "%sc", "%sx", "%tb", "%time", "%timeit",
             "%unalias", "%unload_ext", "%who", "%who_ls", "%whos", "%xdel", "%xmode"]
 
         def make_dynamic_magic(i):
                 def inner_dynamic_magic():
                     self.active_frontend.execute(i)
                 inner_dynamic_magic.__name__ = "dynamics_magic_%s" % i
                 return inner_dynamic_magic
 
         for magic in magiclist:
             xaction = QtGui.QAction(magic,
                 self,
                 triggered=make_dynamic_magic(magic)
                 )
             self.all_magic_menu.addAction(xaction)
 
     def cut_active_frontend(self):
         self.active_frontend.cut_action.trigger()
 
     def copy_active_frontend(self):
         self.active_frontend.copy_action.trigger()
 
     def paste_active_frontend(self):
         self.active_frontend.paste_action.trigger()
 
     def undo_active_frontend(self):
         self.active_frontend.undo()
 
     def redo_active_frontend(self):
         self.active_frontend.redo()
 
     def reset_magic_active_frontend(self):
         self.active_frontend.execute("%reset")
 
     def history_magic_active_frontend(self):
         self.active_frontend.execute("%history")
 
     def save_magic_active_frontend(self):
         self.active_frontend.save_magic()
 
     def clear_magic_active_frontend(self):
         self.active_frontend.execute("%clear")
 
     def who_magic_active_frontend(self):
         self.active_frontend.execute("%who")
 
     def who_ls_magic_active_frontend(self):
         self.active_frontend.execute("%who_ls")
 
     def whos_magic_active_frontend(self):
         self.active_frontend.execute("%whos")
 
     def print_action_active_frontend(self):
         self.active_frontend.print_action.trigger()
 
     def export_action_active_frontend(self):
         self.active_frontend.export_action.trigger()
 
     def select_all_active_frontend(self):
         self.active_frontend.select_all_action.trigger()
 
     def increase_font_size_active_frontend(self):
         self.active_frontend.increase_font_size.trigger()
 
     def decrease_font_size_active_frontend(self):
         self.active_frontend.decrease_font_size.trigger()
 
     def reset_font_size_active_frontend(self):
         self.active_frontend.reset_font_size.trigger()
 
     def guiref_active_frontend(self):
         self.active_frontend.execute("%guiref")
 
     def intro_active_frontend(self):
         self.active_frontend.execute("?")
 
     def quickref_active_frontend(self):
         self.active_frontend.execute("%quickref")
     #---------------------------------------------------------------------------
     # QWidget interface
     #---------------------------------------------------------------------------
 
     def closeEvent(self, event):
         """ Forward the close event to every tabs contained by the windows
         """
         # Do Not loop on the widget count as it change while closing
         widget_list=[ self.tab_widget.widget(i) for i in  range(self.tab_widget.count())]
         for widget in widget_list:
             self.close_tab(widget)
         event.accept()
 
 #-----------------------------------------------------------------------------
 # Aliases and Flags
 #-----------------------------------------------------------------------------
 
 flags = dict(ipkernel_flags)
 qt_flags = {
     'existing' : ({'IPythonQtConsoleApp' : {'existing' : 'kernel*.json'}},
             "Connect to an existing kernel. If no argument specified, guess most recent"),
     '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)
 
 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',
     existing = 'IPythonQtConsoleApp.existing',
     f = 'IPythonQtConsoleApp.connection_file',
 
     style = 'IPythonWidget.syntax_style',
     stylesheet = 'IPythonQtConsoleApp.stylesheet',
     colors = 'ZMQInteractiveShell.colors',
 
     editor = 'IPythonWidget.editor',
     paging = 'ConsoleWidget.paging',
     ssh = 'IPythonQtConsoleApp.sshserver',
 )
 aliases.update(qt_aliases)
 
 
 #-----------------------------------------------------------------------------
 # 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]")
     connection_file = Unicode('', config=True,
         help="""JSON file in which to store connection info [default: kernel-<pid>.json]
 
         This file will contain the IP, ports, and authentication key needed to connect
         clients to this kernel. By default, this file will be created in the security-dir
         of the current profile, but can be specified by absolute path.
         """)
     def _connection_file_default(self):
         return 'kernel-%i.json' % os.getpid()
 
     existing = Unicode('', config=True,
         help="""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('-') and a.lstrip('-') in qt_flags:
                 self.kernel_argv.remove(a)
         swallow_next = False
         for a in argv:
             if swallow_next:
                 self.kernel_argv.remove(a)
                 swallow_next = False
                 continue
             if a.startswith('-'):
                 split = a.lstrip('-').split('=')
                 alias = split[0]
                 if alias in qt_aliases:
                     self.kernel_argv.remove(a)
                     if len(split) == 1:
                         # alias passed with arg via space
                         swallow_next = True
     
     def init_connection_file(self):
         """find the connection file, and load the info if found.
         
         The current working directory and the current profile's security
         directory will be searched for the file if it is not given by
         absolute path.
         
         When attempting to connect to an existing kernel and the `--existing`
         argument does not match an existing file, it will be interpreted as a
         fileglob, and the matching file in the current profile's security dir
         with the latest access time will be used.
         """
         if self.existing:
             try:
                 cf = find_connection_file(self.existing)
             except Exception:
                 self.log.critical("Could not find existing kernel connection file %s", self.existing)
                 self.exit(1)
             self.log.info("Connecting to existing kernel: %s" % cf)
             self.connection_file = cf
         # should load_connection_file only be used for existing?
         # as it is now, this allows reusing ports if an existing
         # file is requested
         try:
             self.load_connection_file()
         except Exception:
             self.log.error("Failed to load connection file: %r", self.connection_file, exc_info=True)
             self.exit(1)
     
     def load_connection_file(self):
         """load ip/port/hmac config from JSON connection file"""
         # this is identical to KernelApp.load_connection_file
         # perhaps it can be centralized somewhere?
         try:
             fname = filefind(self.connection_file, ['.', self.profile_dir.security_dir])
         except IOError:
             self.log.debug("Connection File not found: %s", self.connection_file)
             return
         self.log.debug(u"Loading connection file %s", fname)
         with open(fname) as f:
             s = f.read()
         cfg = json.loads(s)
         if self.ip == LOCALHOST and 'ip' in cfg:
             # not overridden by config or cl_args
             self.ip = cfg['ip']
         for channel in ('hb', 'shell', 'iopub', 'stdin'):
             name = channel + '_port'
             if getattr(self, name) == 0 and name in cfg:
                 # not overridden by config or cl_args
                 setattr(self, name, cfg[name])
         if 'key' in cfg:
             self.config.Session.key = str_to_bytes(cfg['key'])
     
     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:
             # specifying just the key implies that we are connecting directly
             self.sshserver = self.ip
             self.ip = LOCALHOST
         
         # build connection dict for tunnels:
         info = dict(ip=self.ip,
                     shell_port=self.shell_port,
                     iopub_port=self.iopub_port,
                     stdin_port=self.stdin_port,
                     hb_port=self.hb_port
         )
         
         self.log.info("Forwarding connections to %s via %s"%(self.ip, self.sshserver))
         
         # tunnels return a new set of ports, which will be on localhost:
         self.ip = LOCALHOST
         try:
             newports = tunnel_to_kernel(info, self.sshserver, self.sshkey)
         except:
             # even catch KeyboardInterrupt
             self.log.error("Could not setup tunnels", exc_info=True)
             self.exit(1)
         
         self.shell_port, self.iopub_port, self.stdin_port, self.hb_port = newports
         
         cf = self.connection_file
         base,ext = os.path.splitext(cf)
         base = os.path.basename(base)
         self.connection_file = os.path.basename(base)+'-ssh'+ext
         self.log.critical("To connect another client via this tunnel, use:")
         self.log.critical("--existing %s" % self.connection_file)
 
     def init_kernel_manager(self):
         # Don't let Qt or ZMQ swallow KeyboardInterupts.
         signal.signal(signal.SIGINT, signal.SIG_DFL)
         sec = self.profile_dir.security_dir
         try:
             cf = filefind(self.connection_file, ['.', sec])
         except IOError:
             # file might not exist
             if self.connection_file == os.path.basename(self.connection_file):
                 # just shortname, put it in security dir
                 cf = os.path.join(sec, self.connection_file)
             else:
                 cf = self.connection_file
 
         # Create a KernelManager and start a kernel.
         self.kernel_manager = QtKernelManager(
                                 ip=self.ip,
                                 shell_port=self.shell_port,
                                 iopub_port=self.iopub_port,
                                 stdin_port=self.stdin_port,
                                 hb_port=self.hb_port,
                                 connection_file=cf,
                                 config=self.config,
         )
         # start the kernel
         if not self.existing:
             kwargs = dict(ipython=not self.pure)
             kwargs['extra_arguments'] = self.kernel_argv
             self.kernel_manager.start_kernel(**kwargs)
         elif self.sshserver:
             # ssh, write new connection file
             self.kernel_manager.write_connection_file()
         self.kernel_manager.start_channels()
 
     def create_tab_with_new_frontend(self):
         """ Create new tab attached to new kernel, launched on localhost.
         """
         kernel_manager = QtKernelManager(
                                 shell_address=(LOCALHOST,0 ),
                                 sub_address=(LOCALHOST, 0),
                                 stdin_address=(LOCALHOST, 0),
                                 hb_address=(LOCALHOST, 0),
                                 config=self.config
         )
         # start the kernel
         kwargs = dict(ip=LOCALHOST, ipython=not self.pure)
         kwargs['extra_arguments'] = self.kernel_argv
         kernel_manager.start_kernel(**kwargs)
         kernel_manager.start_channels()
         local_kernel = (not False) or self.ip in LOCAL_IPS
         widget = self.widget_factory(config=self.config,
                                    local_kernel=local_kernel)
         widget.kernel_manager = kernel_manager
         widget._existing=False;
         widget._confirm_exit=True;
         widget._may_close=True;
         self.window.add_tab_with_frontend(widget)
 
     def create_tab_attached_to_current_tab_kernel(self):
         current_widget = self.window.tab_widget.currentWidget()
         current_widget_index = self.window.tab_widget.indexOf(current_widget)
         current_widget.kernel_manager = current_widget.kernel_manager;
         current_widget_name = self.window.tab_widget.tabText(current_widget_index);
         kernel_manager = QtKernelManager(
                                 shell_address = current_widget.kernel_manager.shell_address,
                                 sub_address = current_widget.kernel_manager.sub_address,
                                 stdin_address = current_widget.kernel_manager.stdin_address,
                                 hb_address = current_widget.kernel_manager.hb_address,
                                 config = self.config
         )
         kernel_manager.start_channels()
         local_kernel = (not self.existing) or self.ip in LOCAL_IPS
         widget = self.widget_factory(config=self.config,
                                    local_kernel=False)
         widget._confirm_exit=True;
         widget._may_close=False;
         widget.kernel_manager = kernel_manager
         self.window.add_tab_with_frontend(widget,name=str('('+current_widget_name+') slave'))
 
     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.widget._existing = self.existing;
         self.widget._may_close = not self.existing;
         self.widget._confirm_exit = not self.existing;
 
         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.log = self.log
         self.window.add_tab_with_frontend(self.widget)
         self.window.init_menu_bar()
         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_connection_file()
         default_secure(self.config)
         self.init_ssh()
         self.init_kernel_manager()
         self.init_qt_elements()
         self.init_colors()
         self.init_window_shortcut()
 
     def init_window_shortcut(self):
 
         self.prev_tab_act = QtGui.QAction("Pre&vious Tab",
             self.window,
             shortcut="Ctrl+PgDown",
             statusTip="Cahange to next tab",
             triggered=self.window.prev_tab)
 
         self.next_tab_act = QtGui.QAction("Ne&xt Tab",
             self.window,
             shortcut="Ctrl+PgUp",
             statusTip="Cahange to next tab",
             triggered=self.window.next_tab)
 
         self.fullScreenAct = QtGui.QAction("&Full Screen",
             self.window,
             shortcut="Ctrl+Meta+Space",
             statusTip="Toggle between Fullscreen and Normal Size",
             triggered=self.toggleFullScreen)
 
 
 
         self.tabAndNewKernelAct =QtGui.QAction("Tab with &New kernel",
             self.window,
             shortcut="Ctrl+T",
             triggered=self.create_tab_with_new_frontend)
         self.window.window_menu.addAction(self.tabAndNewKernelAct)
 
         self.tabSameKernalAct =QtGui.QAction("Tab with Sa&me kernel",
             self.window,
             shortcut="Ctrl+Shift+T",
             triggered=self.create_tab_attached_to_current_tab_kernel)
         self.window.window_menu.addAction(self.tabSameKernalAct)
         self.window.window_menu.addSeparator()
 
         self.onlineHelpAct = QtGui.QAction("Open Online &Help",
             self.window,
             triggered=self._open_online_help)
         self.window.help_menu.addAction(self.onlineHelpAct)
         # creating shortcut in menubar only for Mac OS as I don't
         # know the shortcut or if the windows manager assign it in
         # other platform.
         if sys.platform == 'darwin':
             self.minimizeAct = QtGui.QAction("Mini&mize",
                 self.window,
                 shortcut="Ctrl+m",
                 statusTip="Minimize the window/Restore Normal Size",
                 triggered=self.toggleMinimized)
             self.maximizeAct = QtGui.QAction("Ma&ximize",
                 self.window,
                 shortcut="Ctrl+Shift+M",
                 statusTip="Maximize the window/Restore Normal Size",
                 triggered=self.toggleMaximized)
 
 
             self.window_menu = self.window.window_menu
 
             self.window_menu.addAction(self.next_tab_act)
             self.window_menu.addAction(self.prev_tab_act)
             self.window_menu.addSeparator()
             self.window_menu.addAction(self.minimizeAct)
             self.window_menu.addAction(self.maximizeAct)
             self.window_menu.addSeparator()
             self.window_menu.addAction(self.fullScreenAct)
 
         else:
             # if we don't put it in a menu, we add it to the window so
             # that it can still be triggerd by shortcut
             self.window.addAction(self.fullScreenAct)
 
             # Don't activate toggleMenubar on mac, doen't work,
             # as toolbar always here
             self.toggle_menu_bar_act = QtGui.QAction("&Toggle Menu Bar",
                 self.window,
                 shortcut="Ctrl+Meta+H",
                 statusTip="Toggle menubar betwin visible and not",
                 triggered=self.toggle_menu_bar)
             self.window_menu.addAction(self.toggle_menu_bar_act)
 
     def toggle_menu_bar(self):
         menu_bar = self.window.menuBar();
         if not menu_bar.isVisible():
             menu_bar.setVisible(False)
         else:
             menu_bar.setVisible(True)
 
     def toggleMinimized(self):
         if not self.window.isMinimized():
             self.window.showMinimized()
         else:
             self.window.showNormal()
 
     def _open_online_help(self):
         filename="http://ipython.org/ipython-doc/stable/index.html"
         webbrowser.open(filename, new=1, autoraise=True)
 
     def toggleMaximized(self):
         if not self.window.isMaximized():
             self.window.showMaximized()
         else:
             self.window.showNormal()
 
     # Min/Max imizing while in full screen give a bug
     # when going out of full screen, at least on OSX
     def toggleFullScreen(self):
         if not self.window.isFullScreen():
             self.window.showFullScreen()
             if sys.platform == 'darwin':
                 self.maximizeAct.setEnabled(False)
                 self.minimizeAct.setEnabled(False)
         else:
             self.window.showNormal()
             if sys.platform == 'darwin':
                 self.maximizeAct.setEnabled(True)
                 self.minimizeAct.setEnabled(True)
 
     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()