fix @fperez suggestions

IPython/frontend/qt/console/frontend_widget.py

@@ -1,708 +1,711 b''
 from __future__ import print_function
 
 # Standard library imports
 from collections import namedtuple
 import sys
 import time
 import uuid
 
 # System library imports
 from pygments.lexers import PythonLexer
 from IPython.external import qt
 from IPython.external.qt import QtCore, QtGui
 
 # Local imports
 from IPython.core.inputsplitter import InputSplitter, transform_classic_prompt
 from IPython.core.oinspect import call_tip
 from IPython.frontend.qt.base_frontend_mixin import BaseFrontendMixin
 from IPython.utils.traitlets import Bool, Instance, Unicode
 from bracket_matcher import BracketMatcher
 from call_tip_widget import CallTipWidget
 from completion_lexer import CompletionLexer
 from history_console_widget import HistoryConsoleWidget
 from pygments_highlighter import PygmentsHighlighter
 
 
 class FrontendHighlighter(PygmentsHighlighter):
     """ A PygmentsHighlighter that understands and ignores prompts.
     """
 
     def __init__(self, frontend):
         super(FrontendHighlighter, self).__init__(frontend._control.document())
         self._current_offset = 0
         self._frontend = frontend
         self.highlighting_on = False
 
     def highlightBlock(self, string):
         """ Highlight a block of text. Reimplemented to highlight selectively.
         """
         if not self.highlighting_on:
             return
 
         # The input to this function is a unicode string that may contain
         # paragraph break characters, non-breaking spaces, etc. Here we acquire
         # the string as plain text so we can compare it.
         current_block = self.currentBlock()
         string = self._frontend._get_block_plain_text(current_block)
 
         # Decide whether to check for the regular or continuation prompt.
         if current_block.contains(self._frontend._prompt_pos):
             prompt = self._frontend._prompt
         else:
             prompt = self._frontend._continuation_prompt
 
         # Only highlight if we can identify a prompt, but make sure not to
         # highlight the prompt.
         if string.startswith(prompt):
             self._current_offset = len(prompt)
             string = string[len(prompt):]
             super(FrontendHighlighter, self).highlightBlock(string)
 
     def rehighlightBlock(self, block):
         """ Reimplemented to temporarily enable highlighting if disabled.
         """
         old = self.highlighting_on
         self.highlighting_on = True
         super(FrontendHighlighter, self).rehighlightBlock(block)
         self.highlighting_on = old
 
     def setFormat(self, start, count, format):
         """ Reimplemented to highlight selectively.
         """
         start += self._current_offset
         super(FrontendHighlighter, self).setFormat(start, count, format)
 
 
 class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):
     """ A Qt frontend for a generic Python kernel.
     """
 
     # The text to show when the kernel is (re)started.
     banner = Unicode()
 
     # An option and corresponding signal for overriding the default kernel
     # interrupt behavior.
     custom_interrupt = Bool(False)
     custom_interrupt_requested = QtCore.Signal()
 
     # An option and corresponding signals for overriding the default kernel
     # restart behavior.
     custom_restart = Bool(False)
     custom_restart_kernel_died = QtCore.Signal(float)
     custom_restart_requested = QtCore.Signal()
 
     # Whether to automatically show calltips on open-parentheses.
     enable_calltips = Bool(True, config=True,
         help="Whether to draw information calltips on open-parentheses.")
 
     # Emitted when a user visible 'execute_request' has been submitted to the
     # kernel from the FrontendWidget. Contains the code to be executed.
     executing = QtCore.Signal(object)
 
     # Emitted when a user-visible 'execute_reply' has been received from the
     # kernel and processed by the FrontendWidget. Contains the response message.
     executed = QtCore.Signal(object)
 
     # Emitted when an exit request has been received from the kernel.
     exit_requested = QtCore.Signal(object)
 
     # Protected class variables.
     _CallTipRequest = namedtuple('_CallTipRequest', ['id', 'pos'])
     _CompletionRequest = namedtuple('_CompletionRequest', ['id', 'pos'])
     _ExecutionRequest = namedtuple('_ExecutionRequest', ['id', 'kind'])
     _input_splitter_class = InputSplitter
     _local_kernel = False
     _highlighter = Instance(FrontendHighlighter)
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
 
     def __init__(self, *args, **kw):
         super(FrontendWidget, self).__init__(*args, **kw)
         # FIXME: remove this when PySide min version is updated past 1.0.7
         # forcefully disable calltips if PySide is < 1.0.7, because they crash
         if qt.QT_API == qt.QT_API_PYSIDE:
             import PySide
             if PySide.__version_info__ < (1,0,7):
                 self.log.warn("PySide %s < 1.0.7 detected, disabling calltips" % PySide.__version__)
                 self.enable_calltips = False
 
         # FrontendWidget protected variables.
         self._bracket_matcher = BracketMatcher(self._control)
         self._call_tip_widget = CallTipWidget(self._control)
         self._completion_lexer = CompletionLexer(PythonLexer())
         self._copy_raw_action = QtGui.QAction('Copy (Raw Text)', None)
         self._hidden = False
         self._highlighter = FrontendHighlighter(self)
         self._input_splitter = self._input_splitter_class(input_mode='cell')
         self._kernel_manager = None
         self._request_info = {}
-        self._callback_dict=dict([])
+        self._callback_dict = {}
 
         # Configure the ConsoleWidget.
         self.tab_width = 4
         self._set_continuation_prompt('... ')
 
         # Configure the CallTipWidget.
         self._call_tip_widget.setFont(self.font)
         self.font_changed.connect(self._call_tip_widget.setFont)
 
         # Configure actions.
         action = self._copy_raw_action
         key = QtCore.Qt.CTRL | QtCore.Qt.SHIFT | QtCore.Qt.Key_C
         action.setEnabled(False)
         action.setShortcut(QtGui.QKeySequence(key))
         action.setShortcutContext(QtCore.Qt.WidgetWithChildrenShortcut)
         action.triggered.connect(self.copy_raw)
         self.copy_available.connect(action.setEnabled)
         self.addAction(action)
 
         # Connect signal handlers.
         document = self._control.document()
         document.contentsChange.connect(self._document_contents_change)
 
         # Set flag for whether we are connected via localhost.
         self._local_kernel = kw.get('local_kernel',
                                     FrontendWidget._local_kernel)
 
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------
 
     def copy(self):
         """ Copy the currently selected text to the clipboard, removing prompts.
         """
         text = self._control.textCursor().selection().toPlainText()
         if text:
             lines = map(transform_classic_prompt, text.splitlines())
             text = '\n'.join(lines)
             QtGui.QApplication.clipboard().setText(text)
 
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' abstract interface
     #---------------------------------------------------------------------------
 
     def _is_complete(self, source, interactive):
         """ Returns whether 'source' can be completely processed and a new
             prompt created. When triggered by an Enter/Return key press,
             'interactive' is True; otherwise, it is False.
         """
         complete = self._input_splitter.push(source)
         if interactive:
             complete = not self._input_splitter.push_accepts_more()
         return complete
 
     def _execute(self, source, hidden):
         """ Execute 'source'. If 'hidden', do not show any output.
 
         See parent class :meth:`execute` docstring for full details.
         """
         msg_id = self.kernel_manager.shell_channel.execute(source, hidden)
         self._request_info['execute'] = self._ExecutionRequest(msg_id, 'user')
         self._hidden = hidden
         if not hidden:
             self.executing.emit(source)
 
     def _prompt_started_hook(self):
         """ Called immediately after a new prompt is displayed.
         """
         if not self._reading:
             self._highlighter.highlighting_on = True
 
     def _prompt_finished_hook(self):
         """ Called immediately after a prompt is finished, i.e. when some input
             will be processed and a new prompt displayed.
         """
         # Flush all state from the input splitter so the next round of
         # reading input starts with a clean buffer.
         self._input_splitter.reset()
 
         if not self._reading:
             self._highlighter.highlighting_on = False
 
     def _tab_pressed(self):
         """ Called when the tab key is pressed. Returns whether to continue
             processing the event.
         """
         # Perform tab completion if:
         # 1) The cursor is in the input buffer.
         # 2) There is a non-whitespace character before the cursor.
         text = self._get_input_buffer_cursor_line()
         if text is None:
             return False
         complete = bool(text[:self._get_input_buffer_cursor_column()].strip())
         if complete:
             self._complete()
         return not complete
 
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _context_menu_make(self, pos):
         """ Reimplemented to add an action for raw copy.
         """
         menu = super(FrontendWidget, self)._context_menu_make(pos)
         for before_action in menu.actions():
             if before_action.shortcut().matches(QtGui.QKeySequence.Paste) == \
                     QtGui.QKeySequence.ExactMatch:
                 menu.insertAction(before_action, self._copy_raw_action)
                 break
         return menu
 
     def request_interrupt_kernel(self):
         if self._executing:
             self.interrupt_kernel()
 
     def request_restart_kernel(self):
         message = 'Are you sure you want to restart the kernel?'
         self.restart_kernel(message, now=False)
 
     def _event_filter_console_keypress(self, event):
         """ Reimplemented for execution interruption and smart backspace.
         """
         key = event.key()
         if self._control_key_down(event.modifiers(), include_command=False):
 
             if key == QtCore.Qt.Key_C and self._executing:
                 self.request_interrupt_kernel()
                 return True
 
             elif key == QtCore.Qt.Key_Period:
                 self.request_restart_kernel()
                 return True
 
         elif not event.modifiers() & QtCore.Qt.AltModifier:
 
             # Smart backspace: remove four characters in one backspace if:
             # 1) everything left of the cursor is whitespace
             # 2) the four characters immediately left of the cursor are spaces
             if key == QtCore.Qt.Key_Backspace:
                 col = self._get_input_buffer_cursor_column()
                 cursor = self._control.textCursor()
                 if col > 3 and not cursor.hasSelection():
                     text = self._get_input_buffer_cursor_line()[:col]
                     if text.endswith('    ') and not text.strip():
                         cursor.movePosition(QtGui.QTextCursor.Left,
                                             QtGui.QTextCursor.KeepAnchor, 4)
                         cursor.removeSelectedText()
                         return True
 
         return super(FrontendWidget, self)._event_filter_console_keypress(event)
 
     def _insert_continuation_prompt(self, cursor):
         """ Reimplemented for auto-indentation.
         """
         super(FrontendWidget, self)._insert_continuation_prompt(cursor)
         cursor.insertText(' ' * self._input_splitter.indent_spaces)
 
     #---------------------------------------------------------------------------
     # 'BaseFrontendMixin' abstract interface
     #---------------------------------------------------------------------------
 
     def _handle_complete_reply(self, rep):
         """ Handle replies for tab completion.
         """
         self.log.debug("complete: %s", rep.get('content', ''))
         cursor = self._get_cursor()
         info = self._request_info.get('complete')
         if info and info.id == rep['parent_header']['msg_id'] and \
                 info.pos == cursor.position():
             text = '.'.join(self._get_context())
             cursor.movePosition(QtGui.QTextCursor.Left, n=len(text))
             self._complete_with_items(cursor, rep['content']['matches'])
 
-    def _silent_exec_callback(self,expr,callback):
-        """ silently execute a function in the kernel and send the reply to the callback
+    def _silent_exec_callback(self, expr, callback):
+        """Silently execute `expr` in the kernel and call `callback` with reply
 
-            expr should be a valid string to be executed by the kernel.
+        `expr` : valid string to be executed by the kernel.
+        `callback` : function accepting one string as argument.
 
-            callback a function accepting one argument (str)
-
-            the callback is called with the 'repr()' of the result as first argument.
-            to get the object, do 'eval()' on the passed value.
+        The `callback` is called with the 'repr()' of the result of `expr` as
+        first argument. To get the object, do 'eval()' on the passed value.
         """
 
         # generate uuid, which would be used as a indication of wether or not
         # the unique request originate from here (can use msg id ?)
         local_uuid = str(uuid.uuid1())
         msg_id = self.kernel_manager.shell_channel.execute('',
-            silent=True,
-            user_expressions={ local_uuid:expr,
-                }
-            )
-        self._callback_dict[local_uuid]=callback
+            silent=True, user_expressions={ local_uuid:expr })
+        self._callback_dict[local_uuid] = callback
         self._request_info['execute'] = self._ExecutionRequest(msg_id, 'silent_exec_callback')
 
-    def _handle_exec_callback(self,msg):
-        """ Called when _silent_exec_callback message comme back from the kernel.
+    def _handle_exec_callback(self, msg):
+        """Execute `callback` corresonding to `msg` reply, after ``_silent_exec_callback``
+
+        `msg` : raw message send by the kernel containing an `user_expressions`
+                and having a 'silent_exec_callback' kind.
 
-            Strip the message comming back from the kernel  and send it to the
-            corresponding callback function.
+        This fonction will look for a `callback` associated with the
+        corresponding message id. Association has been made by
+        ``_silent_exec_callback``. `callback`is then called with the `repr()`
+        of the value of corresponding `user_expressions` as argument.
+        `callback` is then removed from the known list so that any message
+        coming again with the same id won't trigger it.
         """
-        cnt=msg['content']
-        ue=cnt['user_expressions']
+
+        cnt = msg['content']
+        ue = cnt['user_expressions']
         for i in ue.keys():
-            if i in self._callback_dict.keys():
-                f= self._callback_dict[i]
-                f(ue[i])
+            if i in self._callback_dict:
+                self._callback_dict[i](ue[i])
                 self._callback_dict.pop(i)
 
     def _handle_execute_reply(self, msg):
         """ Handles replies for code execution.
         """
         self.log.debug("execute: %s", msg.get('content', ''))
         info = self._request_info.get('execute')
         # unset reading flag, because if execute finished, raw_input can't
         # still be pending.
         self._reading = False
         if info and info.id == msg['parent_header']['msg_id'] and \
                 info.kind == 'user' and not self._hidden:
             # Make sure that all output from the SUB channel has been processed
             # before writing a new prompt.
             self.kernel_manager.sub_channel.flush()
 
             # Reset the ANSI style information to prevent bad text in stdout
             # from messing up our colors. We're not a true terminal so we're
             # allowed to do this.
             if self.ansi_codes:
                 self._ansi_processor.reset_sgr()
 
             content = msg['content']
             status = content['status']
             if status == 'ok':
                 self._process_execute_ok(msg)
             elif status == 'error':
                 self._process_execute_error(msg)
             elif status == 'aborted':
                 self._process_execute_abort(msg)
 
             self._show_interpreter_prompt_for_reply(msg)
             self.executed.emit(msg)
         elif info and info.id == msg['parent_header']['msg_id'] and \
                 info.kind == 'silent_exec_callback' and not self._hidden:
             self._handle_exec_callback(msg)
         else:
             super(FrontendWidget, self)._handle_execute_reply(msg)
 
     def _handle_input_request(self, msg):
         """ Handle requests for raw_input.
         """
         self.log.debug("input: %s", msg.get('content', ''))
         if self._hidden:
             raise RuntimeError('Request for raw input during hidden execution.')
 
         # Make sure that all output from the SUB channel has been processed
         # before entering readline mode.
         self.kernel_manager.sub_channel.flush()
 
         def callback(line):
             self.kernel_manager.stdin_channel.input(line)
         if self._reading:
             self.log.debug("Got second input request, assuming first was interrupted.")
             self._reading = False
         self._readline(msg['content']['prompt'], callback=callback)
 
     def _handle_kernel_died(self, since_last_heartbeat):
         """ Handle the kernel's death by asking if the user wants to restart.
         """
         self.log.debug("kernel died: %s", since_last_heartbeat)
         if self.custom_restart:
             self.custom_restart_kernel_died.emit(since_last_heartbeat)
         else:
             message = 'The kernel heartbeat has been inactive for %.2f ' \
                 'seconds. Do you want to restart the kernel? You may ' \
                 'first want to check the network connection.' % \
                 since_last_heartbeat
             self.restart_kernel(message, now=True)
 
     def _handle_object_info_reply(self, rep):
         """ Handle replies for call tips.
         """
         self.log.debug("oinfo: %s", rep.get('content', ''))
         cursor = self._get_cursor()
         info = self._request_info.get('call_tip')
         if info and info.id == rep['parent_header']['msg_id'] and \
                 info.pos == cursor.position():
             # Get the information for a call tip.  For now we format the call
             # line as string, later we can pass False to format_call and
             # syntax-highlight it ourselves for nicer formatting in the
             # calltip.
             content = rep['content']
             # if this is from pykernel, 'docstring' will be the only key
             if content.get('ismagic', False):
                 # Don't generate a call-tip for magics. Ideally, we should
                 # generate a tooltip, but not on ( like we do for actual
                 # callables.
                 call_info, doc = None, None
             else:
                 call_info, doc = call_tip(content, format_call=True)
             if call_info or doc:
                 self._call_tip_widget.show_call_info(call_info, doc)
 
     def _handle_pyout(self, msg):
         """ Handle display hook output.
         """
         self.log.debug("pyout: %s", msg.get('content', ''))
         if not self._hidden and self._is_from_this_session(msg):
             text = msg['content']['data']
             self._append_plain_text(text + '\n', before_prompt=True)
 
     def _handle_stream(self, msg):
         """ Handle stdout, stderr, and stdin.
         """
         self.log.debug("stream: %s", msg.get('content', ''))
         if not self._hidden and self._is_from_this_session(msg):
             # Most consoles treat tabs as being 8 space characters. Convert tabs
             # to spaces so that output looks as expected regardless of this
             # widget's tab width.
             text = msg['content']['data'].expandtabs(8)
 
             self._append_plain_text(text, before_prompt=True)
             self._control.moveCursor(QtGui.QTextCursor.End)
 
     def _handle_shutdown_reply(self, msg):
         """ Handle shutdown signal, only if from other console.
         """
         self.log.debug("shutdown: %s", msg.get('content', ''))
         if not self._hidden and not self._is_from_this_session(msg):
             if self._local_kernel:
                 if not msg['content']['restart']:
                     self.exit_requested.emit(self)
                 else:
                     # we just got notified of a restart!
                     time.sleep(0.25) # wait 1/4 sec to reset
                                      # lest the request for a new prompt
                                      # goes to the old kernel
                     self.reset()
             else: # remote kernel, prompt on Kernel shutdown/reset
                 title = self.window().windowTitle()
                 if not msg['content']['restart']:
                     reply = QtGui.QMessageBox.question(self, title,
                         "Kernel has been shutdown permanently. "
                         "Close the Console?",
                         QtGui.QMessageBox.Yes,QtGui.QMessageBox.No)
                     if reply == QtGui.QMessageBox.Yes:
                         self.exit_requested.emit(self)
                 else:
                     reply = QtGui.QMessageBox.question(self, title,
                         "Kernel has been reset. Clear the Console?",
                         QtGui.QMessageBox.Yes,QtGui.QMessageBox.No)
                     if reply == QtGui.QMessageBox.Yes:
                         time.sleep(0.25) # wait 1/4 sec to reset
                                          # lest the request for a new prompt
                                          # goes to the old kernel
                         self.reset()
 
     def _started_channels(self):
         """ Called when the KernelManager channels have started listening or
             when the frontend is assigned an already listening KernelManager.
         """
         self.reset()
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' public interface
     #---------------------------------------------------------------------------
 
     def copy_raw(self):
         """ Copy the currently selected text to the clipboard without attempting
             to remove prompts or otherwise alter the text.
         """
         self._control.copy()
 
     def execute_file(self, path, hidden=False):
         """ Attempts to execute file with 'path'. If 'hidden', no output is
             shown.
         """
         self.execute('execfile(%r)' % path, hidden=hidden)
 
     def interrupt_kernel(self):
         """ Attempts to interrupt the running kernel.
         
         Also unsets _reading flag, to avoid runtime errors
         if raw_input is called again.
         """
         if self.custom_interrupt:
             self._reading = False
             self.custom_interrupt_requested.emit()
         elif self.kernel_manager.has_kernel:
             self._reading = False
             self.kernel_manager.interrupt_kernel()
         else:
             self._append_plain_text('Kernel process is either remote or '
                                     'unspecified. Cannot interrupt.\n')
 
     def reset(self):
         """ Resets the widget to its initial state. Similar to ``clear``, but
             also re-writes the banner and aborts execution if necessary.
         """
         if self._executing:
             self._executing = False
             self._request_info['execute'] = None
         self._reading = False
         self._highlighter.highlighting_on = False
 
         self._control.clear()
         self._append_plain_text(self.banner)
         # update output marker for stdout/stderr, so that startup
         # messages appear after banner:
         self._append_before_prompt_pos = self._get_cursor().position()
         self._show_interpreter_prompt()
 
     def restart_kernel(self, message, now=False):
         """ Attempts to restart the running kernel.
         """
         # FIXME: now should be configurable via a checkbox in the dialog.  Right
         # now at least the heartbeat path sets it to True and the manual restart
         # to False.  But those should just be the pre-selected states of a
         # checkbox that the user could override if so desired.  But I don't know
         # enough Qt to go implementing the checkbox now.
 
         if self.custom_restart:
             self.custom_restart_requested.emit()
 
         elif self.kernel_manager.has_kernel:
             # Pause the heart beat channel to prevent further warnings.
             self.kernel_manager.hb_channel.pause()
 
             # Prompt the user to restart the kernel. Un-pause the heartbeat if
             # they decline. (If they accept, the heartbeat will be un-paused
             # automatically when the kernel is restarted.)
             buttons = QtGui.QMessageBox.Yes | QtGui.QMessageBox.No
             result = QtGui.QMessageBox.question(self, 'Restart kernel?',
                                                 message, buttons)
             if result == QtGui.QMessageBox.Yes:
                 try:
                     self.kernel_manager.restart_kernel(now=now)
                 except RuntimeError:
                     self._append_plain_text('Kernel started externally. '
                                             'Cannot restart.\n')
                 else:
                     self.reset()
             else:
                 self.kernel_manager.hb_channel.unpause()
 
         else:
             self._append_plain_text('Kernel process is either remote or '
                                     'unspecified. Cannot restart.\n')
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _call_tip(self):
         """ Shows a call tip, if appropriate, at the current cursor location.
         """
         # Decide if it makes sense to show a call tip
         if not self.enable_calltips:
             return False
         cursor = self._get_cursor()
         cursor.movePosition(QtGui.QTextCursor.Left)
         if cursor.document().characterAt(cursor.position()) != '(':
             return False
         context = self._get_context(cursor)
         if not context:
             return False
 
         # Send the metadata request to the kernel
         name = '.'.join(context)
         msg_id = self.kernel_manager.shell_channel.object_info(name)
         pos = self._get_cursor().position()
         self._request_info['call_tip'] = self._CallTipRequest(msg_id, pos)
         return True
 
     def _complete(self):
         """ Performs completion at the current cursor location.
         """
         context = self._get_context()
         if context:
             # Send the completion request to the kernel
             msg_id = self.kernel_manager.shell_channel.complete(
                 '.'.join(context),                       # text
                 self._get_input_buffer_cursor_line(),    # line
                 self._get_input_buffer_cursor_column(),  # cursor_pos
                 self.input_buffer)                       # block
             pos = self._get_cursor().position()
             info = self._CompletionRequest(msg_id, pos)
             self._request_info['complete'] = info
 
     def _get_context(self, cursor=None):
         """ Gets the context for the specified cursor (or the current cursor
             if none is specified).
         """
         if cursor is None:
             cursor = self._get_cursor()
         cursor.movePosition(QtGui.QTextCursor.StartOfBlock,
                             QtGui.QTextCursor.KeepAnchor)
         text = cursor.selection().toPlainText()
         return self._completion_lexer.get_context(text)
 
     def _process_execute_abort(self, msg):
         """ Process a reply for an aborted execution request.
         """
         self._append_plain_text("ERROR: execution aborted\n")
 
     def _process_execute_error(self, msg):
         """ Process a reply for an execution request that resulted in an error.
         """
         content = msg['content']
         # If a SystemExit is passed along, this means exit() was called - also
         # all the ipython %exit magic syntax of '-k' to be used to keep
         # the kernel running
         if content['ename']=='SystemExit':
             keepkernel = content['evalue']=='-k' or content['evalue']=='True'
             self._keep_kernel_on_exit = keepkernel
             self.exit_requested.emit(self)
         else:
             traceback = ''.join(content['traceback'])
             self._append_plain_text(traceback)
 
     def _process_execute_ok(self, msg):
         """ Process a reply for a successful execution equest.
         """
         payload = msg['content']['payload']
         for item in payload:
             if not self._process_execute_payload(item):
                 warning = 'Warning: received unknown payload of type %s'
                 print(warning % repr(item['source']))
 
     def _process_execute_payload(self, item):
         """ Process a single payload item from the list of payload items in an
             execution reply. Returns whether the payload was handled.
         """
         # The basic FrontendWidget doesn't handle payloads, as they are a
         # mechanism for going beyond the standard Python interpreter model.
         return False
 
     def _show_interpreter_prompt(self):
         """ Shows a prompt for the interpreter.
         """
         self._show_prompt('>>> ')
 
     def _show_interpreter_prompt_for_reply(self, msg):
         """ Shows a prompt for the interpreter given an 'execute_reply' message.
         """
         self._show_interpreter_prompt()
 
     #------ Signal handlers ----------------------------------------------------
 
     def _document_contents_change(self, position, removed, added):
         """ Called whenever the document's content changes. Display a call tip
             if appropriate.
         """
         # Calculate where the cursor should be *after* the change:
         position += added
 
         document = self._control.document()
         if position == self._get_cursor().position():
             self._call_tip()
 
     #------ Trait default initializers -----------------------------------------
 
     def _banner_default(self):
         """ Returns the standard Python banner.
         """
         banner = 'Python %s on %s\nType "help", "copyright", "credits" or ' \
             '"license" for more information.'
         return banner % (sys.version, sys.platform)

IPython/frontend/qt/console/mainwindow.py

@@ -1,858 +1,879 b''
 """The Qt MainWindow for the QtConsole
 
 This is a tabbed pseudo-terminal of IPython sessions, with a menu bar for
 common actions.
 
 Authors:
 
 * Evan Patterson
 * Min RK
 * Erik Tollerud
 * Fernando Perez
 * Bussonnier Matthias
 * Thomas Kluyver
 
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # stdlib imports
 import sys
 import webbrowser
 from threading import Thread
 
 # System library imports
 from IPython.external.qt import QtGui,QtCore
 
 def background(f):
     """call a function in a simple thread, to prevent blocking"""
     t = Thread(target=f)
     t.start()
     return t
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class MainWindow(QtGui.QMainWindow):
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
 
     def __init__(self, app,
                     confirm_exit=True,
                     new_frontend_factory=None, slave_frontend_factory=None,
                 ):
         """ Create a tabbed MainWindow for managing IPython FrontendWidgets
         
         Parameters
         ----------
         
         app : reference to QApplication parent
         confirm_exit : bool, optional
             Whether we should prompt on close of tabs
         new_frontend_factory : callable
             A callable that returns a new IPythonWidget instance, attached to
             its own running kernel.
         slave_frontend_factory : callable
             A callable that takes an existing IPythonWidget, and  returns a new 
             IPythonWidget instance, attached to the same kernel.
         """
 
         super(MainWindow, self).__init__()
         self._kernel_counter = 0
         self._app = app
         self.confirm_exit = confirm_exit
         self.new_frontend_factory = new_frontend_factory
         self.slave_frontend_factory = slave_frontend_factory
 
         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)
         # hide tab bar at first, since we have no tabs:
         self.tab_widget.tabBar().setVisible(False)
         # prevent focus in tab bar
         self.tab_widget.setFocusPolicy(QtCore.Qt.NoFocus)
 
     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 next_kernel_id(self):
         """constantly increasing counter for kernel IDs"""
         c = self._kernel_counter
         self._kernel_counter += 1
         return c
 
     @property
     def active_frontend(self):
         return self.tab_widget.currentWidget()
     
     def create_tab_with_new_frontend(self):
         """create a new frontend and attach it to a new tab"""
         widget = self.new_frontend_factory()
         self.add_tab_with_frontend(widget)
     
     def create_tab_with_current_kernel(self):
         """create a new frontend attached to the same kernel as the current tab"""
         current_widget = self.tab_widget.currentWidget()
         current_widget_index = self.tab_widget.indexOf(current_widget)
         current_widget_name = self.tab_widget.tabText(current_widget_index)
         widget = self.slave_frontend_factory(current_widget)
         if 'slave' in current_widget_name:
             # don't keep stacking slaves
             name = current_widget_name
         else:
             name = '(%s) slave' % current_widget_name
         self.add_tab_with_frontend(widget,name=name)
 
     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 slave widgets on the same kernel.
         slave_tabs = self.find_slave_widgets(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 exit magic (_keep_kernel_on_exit, exist and not None)
             # we set local slave tabs._hidden to True to avoid prompting for kernel
             # restart when they get the signal. and then "forward" the 'exit'
             # to the main window
             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)
                     self.update_tab_bar_visibility()
                     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 = 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 close all attached Consoles as well?"
                     justthis = QtGui.QPushButton("&No, just this Tab", self)
                     justthis.setShortcut('N')
                     closeall = QtGui.QPushButton("&Yes, close all", 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:
                             background(slave.kernel_manager.stop_channels)
                             self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                         closing_widget.execute("exit")
                         self.tab_widget.removeTab(current_tab)
                         background(kernel_manager.stop_channels)
                     elif reply == 0: # close Console
                         if not closing_widget._existing:
                             # Have kernel: don't quit, just close the tab
                             closing_widget.execute("exit True")
                         self.tab_widget.removeTab(current_tab)
                         background(kernel_manager.stop_channels)
                 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)
             self.tab_widget.removeTab(current_tab)
             background(kernel_manager.stop_channels)
         else: #close console and kernel (no prompt)
             self.tab_widget.removeTab(current_tab)
             if kernel_manager and kernel_manager.channels_running:
                 for slave in slave_tabs:
                     background(slave.kernel_manager.stop_channels)
                     self.tab_widget.removeTab(self.tab_widget.indexOf(slave))
                 kernel_manager.shutdown_kernel()
                 background(kernel_manager.stop_channels)
         
         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 = 'kernel %i' % self.next_kernel_id
         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 isinstance(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
         filtered_widget_list = [ widget for widget in widget_list if
                                 widget.kernel_manager.connection_file == km.connection_file and
                                 hasattr(widget,'_may_close') ]
         # the master widget is the one that may close the kernel
         master_widget= [ widget for widget in filtered_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_slave_widgets(self,tab):
         """return all the frontends that do not own the kernel attached to the given widget/tab.
 
             Only find frontends owned by the current application. Selection
             based on connection file of the kernel.
 
             This function does the conversion tabNumber/widget if needed.
         """
         #convert from/to int/richIpythonWidget if needed
         if isinstance(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.connection_file == km.connection_file)
         # 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
 
     # Populate the menu bar with common actions and shortcuts
     def add_menu_action(self, menu, action, defer_shortcut=False):
         """Add action to menu as well as self
         
         So that when the menu bar is invisible, its actions are still available.
         
         If defer_shortcut is True, set the shortcut context to widget-only,
         where it will avoid conflict with shortcuts already bound to the
         widgets themselves.
         """
         menu.addAction(action)
         self.addAction(action)
 
         if defer_shortcut:
             action.setShortcutContext(QtCore.Qt.WidgetShortcut)
     
     def init_menu_bar(self):
         #create menu in the order they should appear in the menu bar
         self.init_file_menu()
         self.init_edit_menu()
         self.init_view_menu()
         self.init_kernel_menu()
         self.init_magic_menu()
         self.init_window_menu()
         self.init_help_menu()
     
     def init_file_menu(self):
         self.file_menu = self.menuBar().addMenu("&File")
         
         self.new_kernel_tab_act = QtGui.QAction("New Tab with &New kernel",
             self,
             shortcut="Ctrl+T",
             triggered=self.create_tab_with_new_frontend)
         self.add_menu_action(self.file_menu, self.new_kernel_tab_act)
 
         self.slave_kernel_tab_act = QtGui.QAction("New Tab with Sa&me kernel",
             self,
             shortcut="Ctrl+Shift+T",
             triggered=self.create_tab_with_current_kernel)
         self.add_menu_action(self.file_menu, self.slave_kernel_tab_act)
         
         self.file_menu.addSeparator()
 
         self.close_action=QtGui.QAction("&Close Tab",
             self,
             shortcut=QtGui.QKeySequence.Close,
             triggered=self.close_active_frontend
             )
         self.add_menu_action(self.file_menu, self.close_action)
 
         self.export_action=QtGui.QAction("&Save to HTML/XHTML",
             self,
             shortcut=QtGui.QKeySequence.Save,
             triggered=self.export_action_active_frontend
             )
         self.add_menu_action(self.file_menu, self.export_action, True)
 
         self.file_menu.addSeparator()
         
         printkey = QtGui.QKeySequence(QtGui.QKeySequence.Print)
         if printkey.matches("Ctrl+P") and sys.platform != 'darwin':
             # Only override the default if there is a collision.
             # Qt ctrl = cmd on OSX, so the match gets a false positive on OSX.
             printkey = "Ctrl+Shift+P"
         self.print_action = QtGui.QAction("&Print",
             self,
             shortcut=printkey,
             triggered=self.print_action_active_frontend)
         self.add_menu_action(self.file_menu, self.print_action, True)
         
         if sys.platform != 'darwin':
             # OSX always has Quit in the Application menu, only add it
             # to the File menu elsewhere.
 
             self.file_menu.addSeparator()
 
             self.quit_action = QtGui.QAction("&Quit",
                 self,
                 shortcut=QtGui.QKeySequence.Quit,
                 triggered=self.close,
             )
             self.add_menu_action(self.file_menu, self.quit_action)
 
     
     def init_edit_menu(self):
         self.edit_menu = self.menuBar().addMenu("&Edit")
         
         self.undo_action = QtGui.QAction("&Undo",
             self,
             shortcut=QtGui.QKeySequence.Undo,
             statusTip="Undo last action if possible",
             triggered=self.undo_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.undo_action)
 
         self.redo_action = QtGui.QAction("&Redo",
             self,
             shortcut=QtGui.QKeySequence.Redo,
             statusTip="Redo last action if possible",
             triggered=self.redo_active_frontend)
         self.add_menu_action(self.edit_menu, self.redo_action)
 
         self.edit_menu.addSeparator()
 
         self.cut_action = QtGui.QAction("&Cut",
             self,
             shortcut=QtGui.QKeySequence.Cut,
             triggered=self.cut_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.cut_action, True)
 
         self.copy_action = QtGui.QAction("&Copy",
             self,
             shortcut=QtGui.QKeySequence.Copy,
             triggered=self.copy_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.copy_action, True)
 
         self.copy_raw_action = QtGui.QAction("Copy (&Raw Text)",
             self,
             shortcut="Ctrl+Shift+C",
             triggered=self.copy_raw_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.copy_raw_action, True)
 
         self.paste_action = QtGui.QAction("&Paste",
             self,
             shortcut=QtGui.QKeySequence.Paste,
             triggered=self.paste_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.paste_action, True)
 
         self.edit_menu.addSeparator()
         
         selectall = QtGui.QKeySequence(QtGui.QKeySequence.SelectAll)
         if selectall.matches("Ctrl+A") and sys.platform != 'darwin':
             # Only override the default if there is a collision.
             # Qt ctrl = cmd on OSX, so the match gets a false positive on OSX.
             selectall = "Ctrl+Shift+A"
         self.select_all_action = QtGui.QAction("Select &All",
             self,
             shortcut=selectall,
             triggered=self.select_all_active_frontend
             )
         self.add_menu_action(self.edit_menu, self.select_all_action, True)
 
     
     def init_view_menu(self):
         self.view_menu = self.menuBar().addMenu("&View")
 
         if sys.platform != 'darwin':
             # disable on OSX, where there is always a menu bar
             self.toggle_menu_bar_act = QtGui.QAction("Toggle &Menu Bar",
                 self,
                 shortcut="Ctrl+Shift+M",
                 statusTip="Toggle visibility of menubar",
                 triggered=self.toggle_menu_bar)
             self.add_menu_action(self.view_menu, self.toggle_menu_bar_act)
         
         fs_key = "Ctrl+Meta+F" if sys.platform == 'darwin' else "F11"
         self.full_screen_act = QtGui.QAction("&Full Screen",
             self,
             shortcut=fs_key,
             statusTip="Toggle between Fullscreen and Normal Size",
             triggered=self.toggleFullScreen)
         self.add_menu_action(self.view_menu, self.full_screen_act)
 
         self.view_menu.addSeparator()
 
         self.increase_font_size = QtGui.QAction("Zoom &In",
             self,
             shortcut=QtGui.QKeySequence.ZoomIn,
             triggered=self.increase_font_size_active_frontend
             )
         self.add_menu_action(self.view_menu, self.increase_font_size, True)
 
         self.decrease_font_size = QtGui.QAction("Zoom &Out",
             self,
             shortcut=QtGui.QKeySequence.ZoomOut,
             triggered=self.decrease_font_size_active_frontend
             )
         self.add_menu_action(self.view_menu, self.decrease_font_size, True)
 
         self.reset_font_size = QtGui.QAction("Zoom &Reset",
             self,
             shortcut="Ctrl+0",
             triggered=self.reset_font_size_active_frontend
             )
         self.add_menu_action(self.view_menu, self.reset_font_size, True)
 
         self.view_menu.addSeparator()
 
         self.clear_action = QtGui.QAction("&Clear Screen",
             self,
             shortcut='Ctrl+L',
             statusTip="Clear the console",
             triggered=self.clear_magic_active_frontend)
         self.add_menu_action(self.view_menu, self.clear_action)
     
     def init_kernel_menu(self):
         self.kernel_menu = self.menuBar().addMenu("&Kernel")
         # Qt on OSX maps Ctrl to Cmd, and Meta to Ctrl
         # keep the signal shortcuts to ctrl, rather than 
         # platform-default like we do elsewhere.
 
         ctrl = "Meta" if sys.platform == 'darwin' else "Ctrl"
 
         self.interrupt_kernel_action = QtGui.QAction("Interrupt current Kernel",
             self,
             triggered=self.interrupt_kernel_active_frontend,
             shortcut=ctrl+"+C",
             )
         self.add_menu_action(self.kernel_menu, self.interrupt_kernel_action)
 
         self.restart_kernel_action = QtGui.QAction("Restart current Kernel",
             self,
             triggered=self.restart_kernel_active_frontend,
             shortcut=ctrl+"+.",
             )
         self.add_menu_action(self.kernel_menu, self.restart_kernel_action)
 
         self.kernel_menu.addSeparator()
 
+    def _make_dynamic_magic(self,magic):
+        """Return a function `fun` that will execute `magic` on active frontend.
+
+        `magic` : valid python string
+
+        return `fun`, function with no parameters
+
+        `fun` execute `magic` an active frontend at the moment it is triggerd,
+        not the active frontend at the moment it has been created.
+
+        This function is mostly used to create the "All Magics..." Menu at run time.
+        """
+        # need to level nested function  to be sure to past magic
+        # on active frontend **at run time**.
+        def inner_dynamic_magic():
+            self.active_frontend.execute(magic)
+        inner_dynamic_magic.__name__ = "dynamics_magic_s"
+        return inner_dynamic_magic
+
+    def populate_all_magic_menu(self, listofmagic=None):
+        """Clean "All Magics..." menu and repopulate it with `listofmagic`
+
+        `listofmagic` : string, repr() of a list of strings.
+
+        `listofmagic`is a repr() of list because it is fed with the result of
+        a 'user_expression'
+        """
+        alm_magic_menu = self.all_magic_menu
+        alm_magic_menu.clear()
+
+        # list of protected magic that don't like to be called without argument
+        # append '?' to the end to print the docstring when called from the menu
+        protected_magic = set(["more","less","load_ext","pycat","loadpy","save"])
+
+        for magic in eval(listofmagic):
+            if magic in protected_magic:
+                pmagic = '%s%s%s'%('%',magic,'?')
+            else:
+                pmagic = '%s%s'%('%',magic)
+            xaction = QtGui.QAction(pmagic,
+                self,
+                triggered=self._make_dynamic_magic(pmagic)
+                )
+            alm_magic_menu.addAction(xaction)
+
     def update_all_magic_menu(self):
         # first define a callback which will get the list of all magic and put it in the menu.
-        def populate_all_magic_menu(val=None):
-            alm_magic_menu = self.all_magic_menu
-            alm_magic_menu.clear()
-            def make_dynamic_magic(i):
-                    def inner_dynamic_magic():
-                        self.active_frontend.execute(i)
-                    inner_dynamic_magic.__name__ = "dynamics_magic_s"
-                    return inner_dynamic_magic
-
-            # list of protected magic that don't like to be called without argument
-            # append '?' to the end to print the docstring when called from the menu
-            protected_magic= ["more","less","load_ext","pycat","loadpy","save"]
-
-            for magic in eval(val):
-                if magic in protected_magic:
-                    pmagic = '%s%s%s'%('%',magic,'?')
-                else:
-                    pmagic = '%s%s'%('%',magic)
-                xaction = QtGui.QAction(pmagic,
-                    self,
-                    triggered=make_dynamic_magic(pmagic)
-                    )
-                alm_magic_menu.addAction(xaction)
-        self.active_frontend._silent_exec_callback('get_ipython().lsmagic()',populate_all_magic_menu)
+        self.active_frontend._silent_exec_callback('get_ipython().lsmagic()',self.populate_all_magic_menu)
 
     def init_magic_menu(self):
         self.magic_menu = self.menuBar().addMenu("&Magic")
         self.all_magic_menu = self.magic_menu.addMenu("&All Magics")
 
         # this action should not appear as it will be cleard when menu
         # will be updated at first kernel response.
         self.pop = QtGui.QAction("&Update All Magic Menu ",
-            self,
-            triggered=self.update_all_magic_menu)
+            self, triggered=self.update_all_magic_menu)
         self.add_menu_action(self.all_magic_menu, self.pop)
 
         self.reset_action = QtGui.QAction("&Reset",
             self,
             statusTip="Clear all varible from workspace",
             triggered=self.reset_magic_active_frontend)
         self.add_menu_action(self.magic_menu, self.reset_action)
 
         self.history_action = QtGui.QAction("&History",
             self,
             statusTip="show command history",
             triggered=self.history_magic_active_frontend)
         self.add_menu_action(self.magic_menu, 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.add_menu_action(self.magic_menu, self.save_action)
 
         self.who_action = QtGui.QAction("&Who",
             self,
             statusTip="List interactive variable",
             triggered=self.who_magic_active_frontend)
         self.add_menu_action(self.magic_menu, 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.add_menu_action(self.magic_menu, 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.add_menu_action(self.magic_menu, self.whos_action)
         
     def init_window_menu(self):
         self.window_menu = self.menuBar().addMenu("&Window")
         if sys.platform == 'darwin':
             # add min/maximize actions to OSX, which lacks default bindings.
             self.minimizeAct = QtGui.QAction("Mini&mize",
                 self,
                 shortcut="Ctrl+m",
                 statusTip="Minimize the window/Restore Normal Size",
                 triggered=self.toggleMinimized)
             # maximize is called 'Zoom' on OSX for some reason
             self.maximizeAct = QtGui.QAction("&Zoom",
                 self,
                 shortcut="Ctrl+Shift+M",
                 statusTip="Maximize the window/Restore Normal Size",
                 triggered=self.toggleMaximized)
 
             self.add_menu_action(self.window_menu, self.minimizeAct)
             self.add_menu_action(self.window_menu, self.maximizeAct)
             self.window_menu.addSeparator()
 
         prev_key = "Ctrl+Shift+Left" if sys.platform == 'darwin' else "Ctrl+PgUp"
         self.prev_tab_act = QtGui.QAction("Pre&vious Tab",
             self,
             shortcut=prev_key,
             statusTip="Select previous tab",
             triggered=self.prev_tab)
         self.add_menu_action(self.window_menu, self.prev_tab_act)
 
         next_key = "Ctrl+Shift+Right" if sys.platform == 'darwin' else "Ctrl+PgDown"
         self.next_tab_act = QtGui.QAction("Ne&xt Tab",
             self,
             shortcut=next_key,
             statusTip="Select next tab",
             triggered=self.next_tab)
         self.add_menu_action(self.window_menu, self.next_tab_act)
     
     def init_help_menu(self):
         # 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 fonctionality
 
         self.help_menu = self.menuBar().addMenu("&Help")
         
 
         # Help Menu
 
         self.intro_active_frontend_action = QtGui.QAction("&Intro to IPython",
             self,
             triggered=self.intro_active_frontend
             )
         self.add_menu_action(self.help_menu, self.intro_active_frontend_action)
 
         self.quickref_active_frontend_action = QtGui.QAction("IPython &Cheat Sheet",
             self,
             triggered=self.quickref_active_frontend
             )
         self.add_menu_action(self.help_menu, self.quickref_active_frontend_action)
 
         self.guiref_active_frontend_action = QtGui.QAction("&Qt Console",
             self,
             triggered=self.guiref_active_frontend
             )
         self.add_menu_action(self.help_menu, self.guiref_active_frontend_action)
 
         self.onlineHelpAct = QtGui.QAction("Open Online &Help",
             self,
             triggered=self._open_online_help)
         self.add_menu_action(self.help_menu, self.onlineHelpAct)
 
     # minimize/maximize/fullscreen actions:
 
     def toggle_menu_bar(self):
         menu_bar = self.menuBar()
         if menu_bar.isVisible():
             menu_bar.setVisible(False)
         else:
             menu_bar.setVisible(True)
 
     def toggleMinimized(self):
         if not self.isMinimized():
             self.showMinimized()
         else:
             self.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.isMaximized():
             self.showMaximized()
         else:
             self.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.isFullScreen():
             self.showFullScreen()
             if sys.platform == 'darwin':
                 self.maximizeAct.setEnabled(False)
                 self.minimizeAct.setEnabled(False)
         else:
             self.showNormal()
             if sys.platform == 'darwin':
                 self.maximizeAct.setEnabled(True)
                 self.minimizeAct.setEnabled(True)
 
     def close_active_frontend(self):
         self.close_tab(self.active_frontend)
 
     def restart_kernel_active_frontend(self):
         self.active_frontend.request_restart_kernel()
 
     def interrupt_kernel_active_frontend(self):
         self.active_frontend.request_interrupt_kernel()
 
     def cut_active_frontend(self):
         widget = self.active_frontend
         if widget.can_cut():
             widget.cut()
 
     def copy_active_frontend(self):
         widget = self.active_frontend
         if widget.can_copy():
             widget.copy()
 
     def copy_raw_active_frontend(self):
         self.active_frontend._copy_raw_action.trigger()
 
     def paste_active_frontend(self):
         widget = self.active_frontend
         if widget.can_paste():
             widget.paste()
 
     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
         """
         if self.tab_widget.count() == 0:
             # no tabs, just close
             event.accept()
             return
         # Do Not loop on the widget count as it change while closing
         title = self.window().windowTitle()
         cancel = QtGui.QMessageBox.Cancel
         okay = QtGui.QMessageBox.Ok
         
         if self.confirm_exit:
             if self.tab_widget.count() > 1:
                 msg = "Close all tabs, stop all kernels, and Quit?"
             else:
                 msg = "Close console, stop kernel, and Quit?"
             info = "Kernels not started here (e.g. notebooks) will be left alone."
             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(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_()
         else:
             reply = okay
         
         if reply == cancel:
             event.ignore()
             return
         if reply == okay:
             while self.tab_widget.count() >= 1:
                 # prevent further confirmations:
                 widget = self.active_frontend
                 widget._confirm_exit = False
                 self.close_tab(widget)
             event.accept()
 

IPython/frontend/qt/console/qtconsoleapp.py

@@ -1,552 +1,552 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
 * Bussonnier Matthias
 * Thomas Kluyver
 
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # stdlib imports
 import json
 import os
 import signal
 import sys
 import uuid
 
 # System library imports
 from IPython.external.qt import 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 (
     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
 """
 
 #-----------------------------------------------------------------------------
 # 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)
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # 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 = Integer(0, config=True,
         help="set the heartbeat port [default: random]")
     shell_port = Integer(0, config=True,
         help="set the shell (XREP) port [default: random]")
     iopub_port = Integer(0, config=True,
         help="set the iopub (PUB) port [default: random]")
     stdin_port = Integer(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
         swallow_next = False
         was_flag = False
         # copy again, in case some aliases have the same name as a flag
         # argv = list(self.kernel_argv)
         for a in argv:
             if swallow_next:
                 swallow_next = False
                 # last arg was an alias, remove the next one
                 # *unless* the last alias has a no-arg flag version, in which
                 # case, don't swallow the next arg if it's also a flag:
                 if not (was_flag and a.startswith('-')):
                     self.kernel_argv.remove(a)
                     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
                         # could have been a flag that matches an alias, e.g. `existing`
                         # in which case, we might not swallow the next arg
                         was_flag = alias in qt_flags
                 elif alias in qt_flags:
                     # strip flag, but don't swallow next, as flags don't take args
                     self.kernel_argv.remove(a)
     
     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 _new_connection_file(self):
         return os.path.join(self.profile_dir.security_dir, 'kernel-%s.json' % uuid.uuid4())
 
     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 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 = QtKernelManager(
                                 ip=ip,
                                 connection_file=self._new_connection_file(),
                                 config=self.config,
         )
         # start the kernel
         kwargs = dict(ipython=not self.pure)
         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)
         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 = QtKernelManager(
                                 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)
         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.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()
 
-        #we need to populate the 'Magic Menu' once the kernel has answer at least once
+        # we need to populate the 'Magic Menu' once the kernel has answer at least once
         self.kernel_manager.shell_channel.first_reply.connect(self.window.pop.trigger)
 
         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.syntax_style
         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)
 
     @catch_config_error
     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()
 
     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()