update payload source

should be simple key, not Python (or worse, IPython) specific long key.

I could have sworn I did this long ago,
but apparently the source key was only updated in display_data,
not execute_reply.

IPython/core/payloadpage.py

@@ -1,96 +1,96 b''
 # encoding: utf-8
 """
 A payload based version of page.
 
 Authors:
 
 * Brian Granger
 * Fernando Perez
 """
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Third-party
 try:
     from docutils.core import publish_string
 except ImportError:
     # html paging won't be available, but we don't raise any errors.  It's a
     # purely optional feature.
     pass
 
 # Our own
 from IPython.core.interactiveshell import InteractiveShell
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 def page(strng, start=0, screen_lines=0, pager_cmd=None,
          html=None, auto_html=False):
     """Print a string, piping through a pager.
 
     This version ignores the screen_lines and pager_cmd arguments and uses
     IPython's payload system instead.
 
     Parameters
     ----------
     strng : str
       Text to page.
 
     start : int
       Starting line at which to place the display.
     
     html : str, optional
       If given, an html string to send as well.
 
     auto_html : bool, optional
       If true, the input string is assumed to be valid reStructuredText and is
       converted to HTML with docutils.  Note that if docutils is not found,
       this option is silently ignored.
 
     Notes
     -----
 
     Only one of the ``html`` and ``auto_html`` options can be given, not
     both.
     """
 
     # Some routines may auto-compute start offsets incorrectly and pass a
     # negative value.  Offset to 0 for robustness.
     start = max(0, start)
     shell = InteractiveShell.instance()
 
     if auto_html:
         try:
             # These defaults ensure user configuration variables for docutils
             # are not loaded, only our config is used here.
             defaults = {'file_insertion_enabled': 0,
                         'raw_enabled': 0,
                         '_disable_config': 1}
             html = publish_string(strng, writer_name='html',
                                   settings_overrides=defaults)
         except:
             pass
         
     payload = dict(
-        source='IPython.kernel.zmq.page.page',
+        source='page',
         text=strng,
         html=html,
         start_line_number=start
         )
     shell.payload_manager.write_payload(payload)
 
 
 def install_payload_page():
     """Install this version of page as IPython.core.page.page."""
     from IPython.core import page as corepage
     corepage.page = page

IPython/html/static/services/kernels/js/kernel.js

@@ -1,501 +1,501 b''
 //----------------------------------------------------------------------------
 //  Copyright (C) 2008-2011  The IPython Development Team
 //
 //  Distributed under the terms of the BSD License.  The full license is in
 //  the file COPYING, distributed as part of this software.
 //----------------------------------------------------------------------------
 
 //============================================================================
 // Kernel
 //============================================================================
 
 /**
  * @module IPython
  * @namespace IPython
  * @submodule Kernel
  */
 
 var IPython = (function (IPython) {
 
     var utils = IPython.utils;
 
     // Initialization and connection.
     /**
      * A Kernel Class to communicate with the Python kernel
      * @Class Kernel
      */
     var Kernel = function (base_url) {
         this.kernel_id = null;
         this.shell_channel = null;
         this.iopub_channel = null;
         this.stdin_channel = null;
         this.base_url = base_url;
         this.running = false;
         this.username = "username";
         this.session_id = utils.uuid();
         this._msg_callbacks = {};
 
         if (typeof(WebSocket) !== 'undefined') {
             this.WebSocket = WebSocket;
         } else if (typeof(MozWebSocket) !== 'undefined') {
             this.WebSocket = MozWebSocket;
         } else {
             alert('Your browser does not have WebSocket support, please try Chrome, Safari or Firefox ≥ 6. Firefox 4 and 5 are also supported by you have to enable WebSockets in about:config.');
         };
         this.bind_events();
     };
 
 
     Kernel.prototype._get_msg = function (msg_type, content) {
         var msg = {
             header : {
                 msg_id : utils.uuid(),
                 username : this.username,
                 session : this.session_id,
                 msg_type : msg_type
             },
             metadata : {},
             content : content,
             parent_header : {}
         };
         return msg;
     };
     
     Kernel.prototype.bind_events = function() {
         var that = this;
         $([IPython.events]).on('send_input_reply.Kernel', function(evt, data) { 
             that.send_input_reply(data);
         });
     }
 
     /**
      * Start the Python kernel
      * @method start
      */
     Kernel.prototype.start = function (notebook_id) {
         var that = this;
         if (!this.running) {
             var qs = $.param({notebook:notebook_id});
             var url = this.base_url + '?' + qs;
             $.post(url,
                 $.proxy(that._kernel_started,that),
                 'json'
             );
         };
     };
 
     /**
      * Restart the python kernel.
      *
      * Emit a 'status_restarting.Kernel' event with
      * the current object as parameter
      *
      * @method restart
      */
     Kernel.prototype.restart = function () {
         $([IPython.events]).trigger('status_restarting.Kernel', {kernel: this});
         var that = this;
         if (this.running) {
             this.stop_channels();
             var url = this.kernel_url + "/restart";
             $.post(url,
                 $.proxy(that._kernel_started, that),
                 'json'
             );
         };
     };
 
 
     Kernel.prototype._kernel_started = function (json) {
         console.log("Kernel started: ", json.kernel_id);
         this.running = true;
         this.kernel_id = json.kernel_id;
         var ws_url = json.ws_url;
         if (ws_url.match(/wss?:\/\//) == null) {
             // trailing 's' in https will become wss for secure web sockets
             prot = location.protocol.replace('http', 'ws') + "//";
             ws_url = prot + location.host + ws_url;
         };
         this.ws_url = ws_url;
         this.kernel_url = this.base_url + "/" + this.kernel_id;
         this.start_channels();
         $([IPython.events]).trigger('status_started.Kernel', {kernel: this});
     };
 
 
     Kernel.prototype._websocket_closed = function(ws_url, early) {
         this.stop_channels();
         $([IPython.events]).trigger('websocket_closed.Kernel', 
             {ws_url: ws_url, kernel: this, early: early}
         );
     };
 
     /**
      * Start the `shell`and `iopub` channels.
      * Will stop and restart them if they already exist.
      *
      * @method start_channels
      */
     Kernel.prototype.start_channels = function () {
         var that = this;
         this.stop_channels();
         var ws_url = this.ws_url + this.kernel_url;
         console.log("Starting WebSockets:", ws_url);
         this.shell_channel = new this.WebSocket(ws_url + "/shell");
         this.stdin_channel = new this.WebSocket(ws_url + "/stdin");
         this.iopub_channel = new this.WebSocket(ws_url + "/iopub");
         send_cookie = function(){
             // send the session id so the Session object Python-side
             // has the same identity
             this.send(that.session_id + ':' + document.cookie);
         };
         var already_called_onclose = false; // only alert once
         var ws_closed_early = function(evt){
             if (already_called_onclose){
                 return;
             }
             already_called_onclose = true;
             if ( ! evt.wasClean ){
                 that._websocket_closed(ws_url, true);
             }
         };
         var ws_closed_late = function(evt){
             if (already_called_onclose){
                 return;
             }
             already_called_onclose = true;
             if ( ! evt.wasClean ){
                 that._websocket_closed(ws_url, false);
             }
         };
         var channels = [this.shell_channel, this.iopub_channel, this.stdin_channel];
         for (var i=0; i < channels.length; i++) {
             channels[i].onopen = send_cookie;
             channels[i].onclose = ws_closed_early;
         }
         // switch from early-close to late-close message after 1s
         setTimeout(function() {
             for (var i=0; i < channels.length; i++) {
                 if (channels[i] !== null) {
                     channels[i].onclose = ws_closed_late;
                 }
             }
         }, 1000);
         this.shell_channel.onmessage = $.proxy(this._handle_shell_reply, this);
         this.iopub_channel.onmessage = $.proxy(this._handle_iopub_reply, this);
         this.stdin_channel.onmessage = $.proxy(this._handle_input_request, this);
     };
 
     /**
      * Start the `shell`and `iopub` channels.
      * @method stop_channels
      */
     Kernel.prototype.stop_channels = function () {
         var channels = [this.shell_channel, this.iopub_channel, this.stdin_channel];
         for (var i=0; i < channels.length; i++) {
             if ( channels[i] !== null ) {
                 channels[i].onclose = function (evt) {};
                 channels[i].close();
             }
         };
         this.shell_channel = this.iopub_channel = this.stdin_channel = null;
     };
 
     // Main public methods.
 
     /**
      * Get info on object asynchronoulsy
      *
      * @async
      * @param objname {string}
      * @param callback {dict}
      * @method object_info_request
      *
      * @example
      *
      * When calling this method pass a callbacks structure of the form:
      *
      *     callbacks = {
      *      'object_info_reply': object_info_reply_callback
      *     }
      *
      * The `object_info_reply_callback` will be passed the content object of the
      *
      * `object_into_reply` message documented in
      * [IPython dev documentation](http://ipython.org/ipython-doc/dev/development/messaging.html#object-information)
      */
     Kernel.prototype.object_info_request = function (objname, callbacks) {
         if(typeof(objname)!=null && objname!=null)
         {
             var content = {
                 oname : objname.toString(),
                 detail_level : 0,
             };
             var msg = this._get_msg("object_info_request", content);
             this.shell_channel.send(JSON.stringify(msg));
             this.set_callbacks_for_msg(msg.header.msg_id, callbacks);
             return msg.header.msg_id;
         }
         return;
     }
 
     /**
      * Execute given code into kernel, and pass result to callback.
      *
      * TODO: document input_request in callbacks
      *
      * @async
      * @method execute
      * @param {string} code
      * @param [callbacks] {Object} With the optional following keys
      *      @param callbacks.'execute_reply' {function}
      *      @param callbacks.'output' {function}
      *      @param callbacks.'clear_output' {function}
      *      @param callbacks.'set_next_input' {function}
      * @param {object} [options]
      *      @param [options.silent=false] {Boolean}
      *      @param [options.user_expressions=empty_dict] {Dict}
      *      @param [options.user_variables=empty_list] {List od Strings}
      *      @param [options.allow_stdin=false] {Boolean} true|false
      *
      * @example
      *
      * The options object should contain the options for the execute call. Its default
      * values are:
      *
      *      options = {
      *        silent : true,
      *        user_variables : [],
      *        user_expressions : {},
      *        allow_stdin : false
      *      }
      *
      * When calling this method pass a callbacks structure of the form:
      *
      *      callbacks = {
      *       'execute_reply': execute_reply_callback,
      *       'output': output_callback,
      *       'clear_output': clear_output_callback,
      *       'set_next_input': set_next_input_callback
      *      }
      *
      * The `execute_reply_callback` will be passed the content and metadata
      * objects of the `execute_reply` message documented
      * [here](http://ipython.org/ipython-doc/dev/development/messaging.html#execute)
      *
      * The `output_callback` will be passed `msg_type` ('stream','display_data','pyout','pyerr')
      * of the output and the content and metadata objects of the PUB/SUB channel that contains the
      * output:
      *
      * http://ipython.org/ipython-doc/dev/development/messaging.html#messages-on-the-pub-sub-socket
      *
      * The `clear_output_callback` will be passed a content object that contains
      * stdout, stderr and other fields that are booleans, as well as the metadata object.
      *
      * The `set_next_input_callback` will be passed the text that should become the next
      * input cell.
      */
     Kernel.prototype.execute = function (code, callbacks, options) {
 
         var content = {
             code : code,
             silent : true,
             user_variables : [],
             user_expressions : {},
             allow_stdin : false
         };
         callbacks = callbacks || {};
         if (callbacks.input_request !== undefined) {
             content.allow_stdin = true;
         }
         $.extend(true, content, options)
         $([IPython.events]).trigger('execution_request.Kernel', {kernel: this, content:content});
         var msg = this._get_msg("execute_request", content);
         this.shell_channel.send(JSON.stringify(msg));
         this.set_callbacks_for_msg(msg.header.msg_id, callbacks);
         return msg.header.msg_id;
     };
 
     /**
      * When calling this method pass a callbacks structure of the form:
      *
      *      callbacks = {
      *       'complete_reply': complete_reply_callback
      *      }
      *
      * The `complete_reply_callback` will be passed the content object of the
      * `complete_reply` message documented
      * [here](http://ipython.org/ipython-doc/dev/development/messaging.html#complete)
      *
      * @method complete
      * @param line {integer}
      * @param cursor_pos {integer}
      * @param {dict} callbacks
      *      @param callbacks.complete_reply {function} `complete_reply_callback`
      *
      */
     Kernel.prototype.complete = function (line, cursor_pos, callbacks) {
         callbacks = callbacks || {};
         var content = {
             text : '',
             line : line,
             block : null,
             cursor_pos : cursor_pos
         };
         var msg = this._get_msg("complete_request", content);
         this.shell_channel.send(JSON.stringify(msg));
         this.set_callbacks_for_msg(msg.header.msg_id, callbacks);
         return msg.header.msg_id;
     };
 
 
     Kernel.prototype.interrupt = function () {
         if (this.running) {
             $([IPython.events]).trigger('status_interrupting.Kernel', {kernel: this});
             $.post(this.kernel_url + "/interrupt");
         };
     };
 
 
     Kernel.prototype.kill = function () {
         if (this.running) {
             this.running = false;
             var settings = {
                 cache : false,
                 type : "DELETE"
             };
             $.ajax(this.kernel_url, settings);
         };
     };
 
     Kernel.prototype.send_input_reply = function (input) {
         var content = {
             value : input,
         };
         $([IPython.events]).trigger('input_reply.Kernel', {kernel: this, content:content});
         var msg = this._get_msg("input_reply", content);
         this.stdin_channel.send(JSON.stringify(msg));
         return msg.header.msg_id;
     };
 
 
     // Reply handlers
 
     Kernel.prototype.get_callbacks_for_msg = function (msg_id) {
         var callbacks = this._msg_callbacks[msg_id];
         return callbacks;
     };
 
 
     Kernel.prototype.set_callbacks_for_msg = function (msg_id, callbacks) {
         this._msg_callbacks[msg_id] = callbacks || {};
     }
 
 
     Kernel.prototype._handle_shell_reply = function (e) {
         var reply = $.parseJSON(e.data);
         $([IPython.events]).trigger('shell_reply.Kernel', {kernel: this, reply:reply});
         var header = reply.header;
         var content = reply.content;
         var metadata = reply.metadata;
         var msg_type = header.msg_type;
         var callbacks = this.get_callbacks_for_msg(reply.parent_header.msg_id);
         if (callbacks !== undefined) {
             var cb = callbacks[msg_type];
             if (cb !== undefined) {
                 cb(content, metadata);
             }
         };
 
         if (content.payload !== undefined) {
             var payload = content.payload || [];
             this._handle_payload(callbacks, payload);
         }
     };
 
 
     Kernel.prototype._handle_payload = function (callbacks, payload) {
         var l = payload.length;
         // Payloads are handled by triggering events because we don't want the Kernel
         // to depend on the Notebook or Pager classes.
         for (var i=0; i<l; i++) {
-            if (payload[i].source === 'IPython.kernel.zmq.page.page') {
+            if (payload[i].source === 'page') {
                 var data = {'text':payload[i].text}
                 $([IPython.events]).trigger('open_with_text.Pager', data);
-            } else if (payload[i].source === 'IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.set_next_input') {
+            } else if (payload[i].source === 'set_next_input') {
                 if (callbacks.set_next_input !== undefined) {
                     callbacks.set_next_input(payload[i].text)
                 }
             }
         };
     };
 
 
     Kernel.prototype._handle_iopub_reply = function (e) {
         var reply = $.parseJSON(e.data);
         var content = reply.content;
         var msg_type = reply.header.msg_type;
         var metadata = reply.metadata;
         var callbacks = this.get_callbacks_for_msg(reply.parent_header.msg_id);
         if (msg_type !== 'status' && callbacks === undefined) {
             // Message not from one of this notebook's cells and there are no
             // callbacks to handle it.
             return;
         }
         var output_types = ['stream','display_data','pyout','pyerr'];
         if (output_types.indexOf(msg_type) >= 0) {
             var cb = callbacks['output'];
             if (cb !== undefined) {
                 cb(msg_type, content, metadata);
             }
         } else if (msg_type === 'status') {
             if (content.execution_state === 'busy') {
                 $([IPython.events]).trigger('status_busy.Kernel', {kernel: this});
             } else if (content.execution_state === 'idle') {
                 $([IPython.events]).trigger('status_idle.Kernel', {kernel: this});
             } else if (content.execution_state === 'restarting') {
                 // autorestarting is distinct from restarting,
                 // in that it means the kernel died and the server is restarting it.
                 // status_restarting sets the notification widget,
                 // autorestart shows the more prominent dialog.
                 $([IPython.events]).trigger('status_autorestarting.Kernel', {kernel: this});
                 $([IPython.events]).trigger('status_restarting.Kernel', {kernel: this});
             } else if (content.execution_state === 'dead') {
                 this.stop_channels();
                 $([IPython.events]).trigger('status_dead.Kernel', {kernel: this});
             };
         } else if (msg_type === 'clear_output') {
             var cb = callbacks['clear_output'];
             if (cb !== undefined) {
                 cb(content, metadata);
             }
         };
     };
 
 
     Kernel.prototype._handle_input_request = function (e) {
         var request = $.parseJSON(e.data);
         var header = request.header;
         var content = request.content;
         var metadata = request.metadata;
         var msg_type = header.msg_type;
         if (msg_type !== 'input_request') {
             console.log("Invalid input request!", request);
             return;
         }
         var callbacks = this.get_callbacks_for_msg(request.parent_header.msg_id);
         if (callbacks !== undefined) {
             var cb = callbacks[msg_type];
             if (cb !== undefined) {
                 cb(content, metadata);
             }
         };
     };
 
 
     IPython.Kernel = Kernel;
 
     return IPython;
 
 }(IPython));
 

IPython/kernel/zmq/zmqshell.py

@@ -1,602 +1,602 b''
 """A ZMQ-based subclass of InteractiveShell.
 
 This code is meant to ease the refactoring of the base InteractiveShell into
 something with a cleaner architecture for 2-process use, without actually
 breaking InteractiveShell itself.  So we're doing something a bit ugly, where
 we subclass and override what we want to fix.  Once this is working well, we
 can go back to the base class and refactor the code for a cleaner inheritance
 implementation that doesn't rely on so much monkeypatching.
 
 But this lets us maintain a fully working IPython as we develop the new
 machinery.  This should thus be thought of as scaffolding.
 """
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from __future__ import print_function
 
 # Stdlib
 import os
 import sys
 import time
 
 # System library imports
 from zmq.eventloop import ioloop
 
 # Our own
 from IPython.core.interactiveshell import (
     InteractiveShell, InteractiveShellABC
 )
 from IPython.core import page
 from IPython.core.autocall import ZMQExitAutocall
 from IPython.core.displaypub import DisplayPublisher
 from IPython.core.error import UsageError
 from IPython.core.magics import MacroToEdit, CodeMagics
 from IPython.core.magic import magics_class, line_magic, Magics
 from IPython.core.payloadpage import install_payload_page
 from IPython.display import display, Javascript
 from IPython.kernel.inprocess.socket import SocketABC
 from IPython.kernel import (
     get_connection_file, get_connection_info, connect_qtconsole
 )
 from IPython.testing.skipdoctest import skip_doctest
 from IPython.utils import openpy
 from IPython.utils.jsonutil import json_clean, encode_images
 from IPython.utils.process import arg_split
 from IPython.utils import py3compat
 from IPython.utils.traitlets import Instance, Type, Dict, CBool, CBytes
 from IPython.utils.warn import error
 from IPython.kernel.zmq.displayhook import ZMQShellDisplayHook
 from IPython.kernel.zmq.datapub import ZMQDataPublisher
 from IPython.kernel.zmq.session import extract_header
 from session import Session
 
 #-----------------------------------------------------------------------------
 # Functions and classes
 #-----------------------------------------------------------------------------
 
 class ZMQDisplayPublisher(DisplayPublisher):
     """A display publisher that publishes data using a ZeroMQ PUB socket."""
 
     session = Instance(Session)
     pub_socket = Instance(SocketABC)
     parent_header = Dict({})
     topic = CBytes(b'display_data')
 
     def set_parent(self, parent):
         """Set the parent for outbound messages."""
         self.parent_header = extract_header(parent)
     
     def _flush_streams(self):
         """flush IO Streams prior to display"""
         sys.stdout.flush()
         sys.stderr.flush()
 
     def publish(self, source, data, metadata=None):
         self._flush_streams()
         if metadata is None:
             metadata = {}
         self._validate_data(source, data, metadata)
         content = {}
         content['source'] = source
         content['data'] = encode_images(data)
         content['metadata'] = metadata
         self.session.send(
             self.pub_socket, u'display_data', json_clean(content),
             parent=self.parent_header, ident=self.topic,
         )
 
     def clear_output(self, stdout=True, stderr=True, other=True):
         content = dict(stdout=stdout, stderr=stderr, other=other)
         
         if stdout:
             print('\r', file=sys.stdout, end='')
         if stderr:
             print('\r', file=sys.stderr, end='')
         
         self._flush_streams()
         
         self.session.send(
             self.pub_socket, u'clear_output', content,
             parent=self.parent_header, ident=self.topic,
         )
 
 @magics_class
 class KernelMagics(Magics):
     #------------------------------------------------------------------------
     # Magic overrides
     #------------------------------------------------------------------------
     # Once the base class stops inheriting from magic, this code needs to be
     # moved into a separate machinery as well.  For now, at least isolate here
     # the magics which this class needs to implement differently from the base
     # class, or that are unique to it.
 
     @line_magic
     def doctest_mode(self, parameter_s=''):
         """Toggle doctest mode on and off.
 
         This mode is intended to make IPython behave as much as possible like a
         plain Python shell, from the perspective of how its prompts, exceptions
         and output look.  This makes it easy to copy and paste parts of a
         session into doctests.  It does so by:
 
         - Changing the prompts to the classic ``>>>`` ones.
         - Changing the exception reporting mode to 'Plain'.
         - Disabling pretty-printing of output.
 
         Note that IPython also supports the pasting of code snippets that have
         leading '>>>' and '...' prompts in them.  This means that you can paste
         doctests from files or docstrings (even if they have leading
         whitespace), and the code will execute correctly.  You can then use
         '%history -t' to see the translated history; this will give you the
         input after removal of all the leading prompts and whitespace, which
         can be pasted back into an editor.
 
         With these features, you can switch into this mode easily whenever you
         need to do testing and changes to doctests, without having to leave
         your existing IPython session.
         """
 
         from IPython.utils.ipstruct import Struct
 
         # Shorthands
         shell = self.shell
         disp_formatter = self.shell.display_formatter
         ptformatter = disp_formatter.formatters['text/plain']
         # dstore is a data store kept in the instance metadata bag to track any
         # changes we make, so we can undo them later.
         dstore = shell.meta.setdefault('doctest_mode', Struct())
         save_dstore = dstore.setdefault
 
         # save a few values we'll need to recover later
         mode = save_dstore('mode', False)
         save_dstore('rc_pprint', ptformatter.pprint)
         save_dstore('rc_active_types',disp_formatter.active_types)
         save_dstore('xmode', shell.InteractiveTB.mode)
 
         if mode == False:
             # turn on
             ptformatter.pprint = False
             disp_formatter.active_types = ['text/plain']
             shell.magic('xmode Plain')
         else:
             # turn off
             ptformatter.pprint = dstore.rc_pprint
             disp_formatter.active_types = dstore.rc_active_types
             shell.magic("xmode " + dstore.xmode)
 
         # Store new mode and inform on console
         dstore.mode = bool(1-int(mode))
         mode_label = ['OFF','ON'][dstore.mode]
         print('Doctest mode is:', mode_label)
 
         # Send the payload back so that clients can modify their prompt display
         payload = dict(
-            source='IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.doctest_mode',
+            source='doctest_mode',
             mode=dstore.mode)
         shell.payload_manager.write_payload(payload)
         
     
     _find_edit_target = CodeMagics._find_edit_target
 
     @skip_doctest
     @line_magic
     def edit(self, parameter_s='', last_call=['','']):
         """Bring up an editor and execute the resulting code.
 
         Usage:
           %edit [options] [args]
 
         %edit runs an external text editor. You will need to set the command for
         this editor via the ``TerminalInteractiveShell.editor`` option in your
         configuration file before it will work.
 
         This command allows you to conveniently edit multi-line code right in
         your IPython session.
 
         If called without arguments, %edit opens up an empty editor with a
         temporary file and will execute the contents of this file when you
         close it (don't forget to save it!).
 
 
         Options:
 
         -n <number>: open the editor at a specified line number.  By default,
         the IPython editor hook uses the unix syntax 'editor +N filename', but
         you can configure this by providing your own modified hook if your
         favorite editor supports line-number specifications with a different
         syntax.
 
         -p: this will call the editor with the same data as the previous time
         it was used, regardless of how long ago (in your current session) it
         was.
 
         -r: use 'raw' input.  This option only applies to input taken from the
         user's history.  By default, the 'processed' history is used, so that
         magics are loaded in their transformed version to valid Python.  If
         this option is given, the raw input as typed as the command line is
         used instead.  When you exit the editor, it will be executed by
         IPython's own processor.
 
         -x: do not execute the edited code immediately upon exit. This is
         mainly useful if you are editing programs which need to be called with
         command line arguments, which you can then do using %run.
 
 
         Arguments:
 
         If arguments are given, the following possibilites exist:
 
         - The arguments are numbers or pairs of colon-separated numbers (like
         1 4:8 9). These are interpreted as lines of previous input to be
         loaded into the editor. The syntax is the same of the %macro command.
 
         - If the argument doesn't start with a number, it is evaluated as a
         variable and its contents loaded into the editor. You can thus edit
         any string which contains python code (including the result of
         previous edits).
 
         - If the argument is the name of an object (other than a string),
         IPython will try to locate the file where it was defined and open the
         editor at the point where it is defined. You can use `%edit function`
         to load an editor exactly at the point where 'function' is defined,
         edit it and have the file be executed automatically.
 
         If the object is a macro (see %macro for details), this opens up your
         specified editor with a temporary file containing the macro's data.
         Upon exit, the macro is reloaded with the contents of the file.
 
         Note: opening at an exact line is only supported under Unix, and some
         editors (like kedit and gedit up to Gnome 2.8) do not understand the
         '+NUMBER' parameter necessary for this feature. Good editors like
         (X)Emacs, vi, jed, pico and joe all do.
 
         - If the argument is not found as a variable, IPython will look for a
         file with that name (adding .py if necessary) and load it into the
         editor. It will execute its contents with execfile() when you exit,
         loading any code in the file into your interactive namespace.
 
         After executing your code, %edit will return as output the code you
         typed in the editor (except when it was an existing file). This way
         you can reload the code in further invocations of %edit as a variable,
         via _<NUMBER> or Out[<NUMBER>], where <NUMBER> is the prompt number of
         the output.
 
         Note that %edit is also available through the alias %ed.
 
         This is an example of creating a simple function inside the editor and
         then modifying it. First, start up the editor:
 
         In [1]: ed
         Editing... done. Executing edited code...
         Out[1]: 'def foo():n    print "foo() was defined in an editing session"n'
 
         We can then call the function foo():
 
         In [2]: foo()
         foo() was defined in an editing session
 
         Now we edit foo.  IPython automatically loads the editor with the
         (temporary) file where foo() was previously defined:
 
         In [3]: ed foo
         Editing... done. Executing edited code...
 
         And if we call foo() again we get the modified version:
 
         In [4]: foo()
         foo() has now been changed!
 
         Here is an example of how to edit a code snippet successive
         times. First we call the editor:
 
         In [5]: ed
         Editing... done. Executing edited code...
         hello
         Out[5]: "print 'hello'n"
 
         Now we call it again with the previous output (stored in _):
 
         In [6]: ed _
         Editing... done. Executing edited code...
         hello world
         Out[6]: "print 'hello world'n"
 
         Now we call it with the output #8 (stored in _8, also as Out[8]):
 
         In [7]: ed _8
         Editing... done. Executing edited code...
         hello again
         Out[7]: "print 'hello again'n"
         """
 
         opts,args = self.parse_options(parameter_s,'prn:')
 
         try:
             filename, lineno, _ = CodeMagics._find_edit_target(self.shell, args, opts, last_call)
         except MacroToEdit as e:
             # TODO: Implement macro editing over 2 processes.
             print("Macro editing not yet implemented in 2-process model.")
             return
 
         # Make sure we send to the client an absolute path, in case the working
         # directory of client and kernel don't match
         filename = os.path.abspath(filename)
 
         payload = {
-            'source' : 'IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.edit_magic',
+            'source' : 'edit_magic',
             'filename' : filename,
             'line_number' : lineno
         }
         self.shell.payload_manager.write_payload(payload)
 
     # A few magics that are adapted to the specifics of using pexpect and a
     # remote terminal
 
     @line_magic
     def clear(self, arg_s):
         """Clear the terminal."""
         if os.name == 'posix':
             self.shell.system("clear")
         else:
             self.shell.system("cls")
 
     if os.name == 'nt':
         # This is the usual name in windows
         cls = line_magic('cls')(clear)
 
     # Terminal pagers won't work over pexpect, but we do have our own pager
 
     @line_magic
     def less(self, arg_s):
         """Show a file through the pager.
 
         Files ending in .py are syntax-highlighted."""
         if not arg_s:
             raise UsageError('Missing filename.')
 
         cont = open(arg_s).read()
         if arg_s.endswith('.py'):
             cont = self.shell.pycolorize(openpy.read_py_file(arg_s, skip_encoding_cookie=False))
         else:
             cont = open(arg_s).read()
         page.page(cont)
 
     more = line_magic('more')(less)
 
     # Man calls a pager, so we also need to redefine it
     if os.name == 'posix':
         @line_magic
         def man(self, arg_s):
             """Find the man page for the given command and display in pager."""
             page.page(self.shell.getoutput('man %s | col -b' % arg_s,
                                            split=False))
 
     @line_magic
     def connect_info(self, arg_s):
         """Print information for connecting other clients to this kernel
         
         It will print the contents of this session's connection file, as well as
         shortcuts for local clients.
         
         In the simplest case, when called from the most recently launched kernel,
         secondary clients can be connected, simply with:
         
         $> ipython <app> --existing
         
         """
         
         from IPython.core.application import BaseIPythonApplication as BaseIPApp
         
         if BaseIPApp.initialized():
             app = BaseIPApp.instance()
             security_dir = app.profile_dir.security_dir
             profile = app.profile
         else:
             profile = 'default'
             security_dir = ''
         
         try:
             connection_file = get_connection_file()
             info = get_connection_info(unpack=False)
         except Exception as e:
             error("Could not get connection info: %r" % e)
             return
         
         # add profile flag for non-default profile
         profile_flag = "--profile %s" % profile if profile != 'default' else ""
         
         # if it's in the security dir, truncate to basename
         if security_dir == os.path.dirname(connection_file):
             connection_file = os.path.basename(connection_file)
         
         
         print (info + '\n')
         print ("Paste the above JSON into a file, and connect with:\n"
             "    $> ipython <app> --existing <file>\n"
             "or, if you are local, you can connect with just:\n"
             "    $> ipython <app> --existing {0} {1}\n"
             "or even just:\n"
             "    $> ipython <app> --existing {1}\n"
             "if this is the most recent IPython session you have started.".format(
             connection_file, profile_flag
             )
         )
 
     @line_magic
     def qtconsole(self, arg_s):
         """Open a qtconsole connected to this kernel.
         
         Useful for connecting a qtconsole to running notebooks, for better
         debugging.
         """
         
         # %qtconsole should imply bind_kernel for engines:
         try:
             from IPython.parallel import bind_kernel
         except ImportError:
             # technically possible, because parallel has higher pyzmq min-version
             pass
         else:
             bind_kernel()
         
         try:
             p = connect_qtconsole(argv=arg_split(arg_s, os.name=='posix'))
         except Exception as e:
             error("Could not start qtconsole: %r" % e)
             return
     
     @line_magic
     def autosave(self, arg_s):
         """Set the autosave interval in the notebook (in seconds).
         
         The default value is 120, or two minutes.
         ``%autosave 0`` will disable autosave.
         
         This magic only has an effect when called from the notebook interface.
         It has no effect when called in a startup file.
         """
         
         try:
             interval = int(arg_s)
         except ValueError:
             raise UsageError("%%autosave requires an integer, got %r" % arg_s)
         
         # javascript wants milliseconds
         milliseconds = 1000 * interval
         display(Javascript("IPython.notebook.set_autosave_interval(%i)" % milliseconds),
             include=['application/javascript']
         )
         if interval:
             print("Autosaving every %i seconds" % interval)
         else:
             print("Autosave disabled")
 
 
 class ZMQInteractiveShell(InteractiveShell):
     """A subclass of InteractiveShell for ZMQ."""
 
     displayhook_class = Type(ZMQShellDisplayHook)
     display_pub_class = Type(ZMQDisplayPublisher)
     data_pub_class = Type(ZMQDataPublisher)
 
     # Override the traitlet in the parent class, because there's no point using
     # readline for the kernel. Can be removed when the readline code is moved
     # to the terminal frontend.
     colors_force = CBool(True)
     readline_use = CBool(False)
     # autoindent has no meaning in a zmqshell, and attempting to enable it
     # will print a warning in the absence of readline.
     autoindent = CBool(False)
 
     exiter = Instance(ZMQExitAutocall)
     def _exiter_default(self):
         return ZMQExitAutocall(self)
     
     def _exit_now_changed(self, name, old, new):
         """stop eventloop when exit_now fires"""
         if new:
             loop = ioloop.IOLoop.instance()
             loop.add_timeout(time.time()+0.1, loop.stop)
 
     keepkernel_on_exit = None
 
     # Over ZeroMQ, GUI control isn't done with PyOS_InputHook as there is no
     # interactive input being read; we provide event loop support in ipkernel
     @staticmethod
     def enable_gui(gui):
         from .eventloops import enable_gui as real_enable_gui
         try:
             real_enable_gui(gui)
         except ValueError as e:
             raise UsageError("%s" % e)
 
     def init_environment(self):
         """Configure the user's environment.
 
         """
         env = os.environ
         # These two ensure 'ls' produces nice coloring on BSD-derived systems
         env['TERM'] = 'xterm-color'
         env['CLICOLOR'] = '1'
         # Since normal pagers don't work at all (over pexpect we don't have
         # single-key control of the subprocess), try to disable paging in
         # subprocesses as much as possible.
         env['PAGER'] = 'cat'
         env['GIT_PAGER'] = 'cat'
         
         # And install the payload version of page.
         install_payload_page()
 
     def auto_rewrite_input(self, cmd):
         """Called to show the auto-rewritten input for autocall and friends.
 
         FIXME: this payload is currently not correctly processed by the
         frontend.
         """
         new = self.prompt_manager.render('rewrite') + cmd
         payload = dict(
-            source='IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.auto_rewrite_input',
+            source='auto_rewrite_input',
             transformed_input=new,
             )
         self.payload_manager.write_payload(payload)
 
     def ask_exit(self):
         """Engage the exit actions."""
         self.exit_now = True
         payload = dict(
-            source='IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.ask_exit',
+            source='ask_exit',
             exit=True,
             keepkernel=self.keepkernel_on_exit,
             )
         self.payload_manager.write_payload(payload)
 
     def _showtraceback(self, etype, evalue, stb):
 
         exc_content = {
             u'traceback' : stb,
             u'ename' : unicode(etype.__name__),
             u'evalue' : py3compat.safe_unicode(evalue),
         }
 
         dh = self.displayhook
         # Send exception info over pub socket for other clients than the caller
         # to pick up
         topic = None
         if dh.topic:
             topic = dh.topic.replace(b'pyout', b'pyerr')
         
         exc_msg = dh.session.send(dh.pub_socket, u'pyerr', json_clean(exc_content), dh.parent_header, ident=topic)
 
         # FIXME - Hack: store exception info in shell object.  Right now, the
         # caller is reading this info after the fact, we need to fix this logic
         # to remove this hack.  Even uglier, we need to store the error status
         # here, because in the main loop, the logic that sets it is being
         # skipped because runlines swallows the exceptions.
         exc_content[u'status'] = u'error'
         self._reply_content = exc_content
         # /FIXME
 
         return exc_content
 
     def set_next_input(self, text):
         """Send the specified text to the frontend to be presented at the next
         input cell."""
         payload = dict(
-            source='IPython.kernel.zmq.zmqshell.ZMQInteractiveShell.set_next_input',
+            source='set_next_input',
             text=text
         )
         self.payload_manager.write_payload(payload)
     
     #-------------------------------------------------------------------------
     # Things related to magics
     #-------------------------------------------------------------------------
 
     def init_magics(self):
         super(ZMQInteractiveShell, self).init_magics()
         self.register_magics(KernelMagics)
         self.magics_manager.register_alias('ed', 'edit')
 
 
 
 InteractiveShellABC.register(ZMQInteractiveShell)

IPython/qt/console/ipython_widget.py

@@ -1,584 +1,584 b''
 """ A FrontendWidget that emulates the interface of the console IPython and
     supports the additional functionality provided by the IPython kernel.
 """
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Standard library imports
 from collections import namedtuple
 import os.path
 import re
 from subprocess import Popen
 import sys
 import time
 from textwrap import dedent
 
 # System library imports
 from IPython.external.qt import QtCore, QtGui
 
 # Local imports
 from IPython.core.inputsplitter import IPythonInputSplitter
 from IPython.core.inputtransformer import ipy_prompt
 from IPython.utils.traitlets import Bool, Unicode
 from frontend_widget import FrontendWidget
 import styles
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 # Default strings to build and display input and output prompts (and separators
 # in between)
 default_in_prompt = 'In [<span class="in-prompt-number">%i</span>]: '
 default_out_prompt = 'Out[<span class="out-prompt-number">%i</span>]: '
 default_input_sep = '\n'
 default_output_sep = ''
 default_output_sep2 = ''
 
 # Base path for most payload sources.
 zmq_shell_source = 'IPython.kernel.zmq.zmqshell.ZMQInteractiveShell'
 
 if sys.platform.startswith('win'):
     default_editor = 'notepad'
 else:
     default_editor = ''
 
 #-----------------------------------------------------------------------------
 # IPythonWidget class
 #-----------------------------------------------------------------------------
 
 class IPythonWidget(FrontendWidget):
     """ A FrontendWidget for an IPython kernel.
     """
 
     # If set, the 'custom_edit_requested(str, int)' signal will be emitted when
     # an editor is needed for a file. This overrides 'editor' and 'editor_line'
     # settings.
     custom_edit = Bool(False)
     custom_edit_requested = QtCore.Signal(object, object)
 
     editor = Unicode(default_editor, config=True,
         help="""
         A command for invoking a system text editor. If the string contains a
         {filename} format specifier, it will be used. Otherwise, the filename
         will be appended to the end the command.
         """)
 
     editor_line = Unicode(config=True,
         help="""
         The editor command to use when a specific line number is requested. The
         string should contain two format specifiers: {line} and {filename}. If
         this parameter is not specified, the line number option to the %edit
         magic will be ignored.
         """)
 
     style_sheet = Unicode(config=True,
         help="""
         A CSS stylesheet. The stylesheet can contain classes for:
             1. Qt: QPlainTextEdit, QFrame, QWidget, etc
             2. Pygments: .c, .k, .o, etc. (see PygmentsHighlighter)
             3. IPython: .error, .in-prompt, .out-prompt, etc
         """)
 
     syntax_style = Unicode(config=True,
         help="""
         If not empty, use this Pygments style for syntax highlighting.
         Otherwise, the style sheet is queried for Pygments style
         information.
         """)
 
     # Prompts.
     in_prompt = Unicode(default_in_prompt, config=True)
     out_prompt = Unicode(default_out_prompt, config=True)
     input_sep = Unicode(default_input_sep, config=True)
     output_sep = Unicode(default_output_sep, config=True)
     output_sep2 = Unicode(default_output_sep2, config=True)
 
     # FrontendWidget protected class variables.
     _input_splitter_class = IPythonInputSplitter
     _prompt_transformer = IPythonInputSplitter(physical_line_transforms=[ipy_prompt()],
                                                logical_line_transforms=[],
                                                python_line_transforms=[],
                                               )
 
     # IPythonWidget protected class variables.
     _PromptBlock = namedtuple('_PromptBlock', ['block', 'length', 'number'])
-    _payload_source_edit = zmq_shell_source + '.edit_magic'
-    _payload_source_exit = zmq_shell_source + '.ask_exit'
-    _payload_source_next_input = zmq_shell_source + '.set_next_input'
-    _payload_source_page = 'IPython.kernel.zmq.page.page'
+    _payload_source_edit = 'edit_magic'
+    _payload_source_exit = 'ask_exit'
+    _payload_source_next_input = 'set_next_input'
+    _payload_source_page = 'page'
     _retrying_history_request = False
 
     #---------------------------------------------------------------------------
     # 'object' interface
     #---------------------------------------------------------------------------
 
     def __init__(self, *args, **kw):
         super(IPythonWidget, self).__init__(*args, **kw)
 
         # IPythonWidget protected variables.
         self._payload_handlers = {
             self._payload_source_edit : self._handle_payload_edit,
             self._payload_source_exit : self._handle_payload_exit,
             self._payload_source_page : self._handle_payload_page,
             self._payload_source_next_input : self._handle_payload_next_input }
         self._previous_prompt_obj = None
         self._keep_kernel_on_exit = None
 
         # Initialize widget styling.
         if self.style_sheet:
             self._style_sheet_changed()
             self._syntax_style_changed()
         else:
             self.set_default_style()
 
     #---------------------------------------------------------------------------
     # 'BaseFrontendMixin' abstract interface
     #---------------------------------------------------------------------------
 
     def _handle_complete_reply(self, rep):
         """ Reimplemented to support IPython's improved completion machinery.
         """
         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():
             matches = rep['content']['matches']
             text = rep['content']['matched_text']
             offset = len(text)
 
             # Clean up matches with period and path separators if the matched
             # text has not been transformed. This is done by truncating all
             # but the last component and then suitably decreasing the offset
             # between the current cursor position and the start of completion.
             if len(matches) > 1 and matches[0][:offset] == text:
                 parts = re.split(r'[./\\]', text)
                 sep_count = len(parts) - 1
                 if sep_count:
                     chop_length = sum(map(len, parts[:sep_count])) + sep_count
                     matches = [ match[chop_length:] for match in matches ]
                     offset -= chop_length
 
             # Move the cursor to the start of the match and complete.
             cursor.movePosition(QtGui.QTextCursor.Left, n=offset)
             self._complete_with_items(cursor, matches)
 
     def _handle_execute_reply(self, msg):
         """ Reimplemented to support prompt requests.
         """
         msg_id = msg['parent_header'].get('msg_id')
         info = self._request_info['execute'].get(msg_id)
         if info and info.kind == 'prompt':
            number = msg['content']['execution_count'] + 1
            self._show_interpreter_prompt(number)
            self._request_info['execute'].pop(msg_id)
         else:
            super(IPythonWidget, self)._handle_execute_reply(msg)
 
     def _handle_history_reply(self, msg):
         """ Implemented to handle history tail replies, which are only supported
             by the IPython kernel.
         """
         content = msg['content']
         if 'history' not in content:
             self.log.error("History request failed: %r"%content)
             if content.get('status', '') == 'aborted' and \
                                             not self._retrying_history_request:
                 # a *different* action caused this request to be aborted, so
                 # we should try again.
                 self.log.error("Retrying aborted history request")
                 # prevent multiple retries of aborted requests:
                 self._retrying_history_request = True
                 # wait out the kernel's queue flush, which is currently timed at 0.1s
                 time.sleep(0.25)
                 self.kernel_client.shell_channel.history(hist_access_type='tail',n=1000)
             else:
                 self._retrying_history_request = False
             return
         # reset retry flag
         self._retrying_history_request = False
         history_items = content['history']
         self.log.debug("Received history reply with %i entries", len(history_items))
         items = []
         last_cell = u""
         for _, _, cell in history_items:
             cell = cell.rstrip()
             if cell != last_cell:
                 items.append(cell)
                 last_cell = cell
         self._set_history(items)
 
     def _handle_pyout(self, msg):
         """ Reimplemented for IPython-style "display hook".
         """
         self.log.debug("pyout: %s", msg.get('content', ''))
         if not self._hidden and self._is_from_this_session(msg):
             content = msg['content']
             prompt_number = content.get('execution_count', 0)
             data = content['data']
             if 'text/html' in data:
                 self._append_plain_text(self.output_sep, True)
                 self._append_html(self._make_out_prompt(prompt_number), True)
                 html = data['text/html']
                 self._append_plain_text('\n', True)
                 self._append_html(html + self.output_sep2, True)
             elif 'text/plain' in data:
                 self._append_plain_text(self.output_sep, True)
                 self._append_html(self._make_out_prompt(prompt_number), True)
                 text = data['text/plain']
                 # If the repr is multiline, make sure we start on a new line,
                 # so that its lines are aligned.
                 if "\n" in text and not self.output_sep.endswith("\n"):
                     self._append_plain_text('\n', True)
                 self._append_plain_text(text + self.output_sep2, True)
 
     def _handle_display_data(self, msg):
         """ The base handler for the ``display_data`` message.
         """
         self.log.debug("display: %s", msg.get('content', ''))
         # For now, we don't display data from other frontends, but we
         # eventually will as this allows all frontends to monitor the display
         # data. But we need to figure out how to handle this in the GUI.
         if not self._hidden and self._is_from_this_session(msg):
             source = msg['content']['source']
             data = msg['content']['data']
             metadata = msg['content']['metadata']
             # In the regular IPythonWidget, we simply print the plain text
             # representation.
             if 'text/html' in data:
                 html = data['text/html']
                 self._append_html(html, True)
             elif 'text/plain' in data:
                 text = data['text/plain']
                 self._append_plain_text(text, True)
             # This newline seems to be needed for text and html output.
             self._append_plain_text(u'\n', True)
 
     def _started_channels(self):
         """Reimplemented to make a history request and load %guiref."""
         super(IPythonWidget, self)._started_channels()
         self._load_guiref_magic()
         self.kernel_client.shell_channel.history(hist_access_type='tail',
                                                   n=1000)
     
     def _started_kernel(self):
         """Load %guiref when the kernel starts (if channels are also started).
         
         Principally triggered by kernel restart.
         """
         if self.kernel_client.shell_channel is not None:
             self._load_guiref_magic()
     
     def _load_guiref_magic(self):
         """Load %guiref magic."""
         self.kernel_client.shell_channel.execute('\n'.join([
             "try:",
             "    _usage",
             "except:",
             "    from IPython.core import usage as _usage",
             "    get_ipython().register_magic_function(_usage.page_guiref, 'line', 'guiref')",
             "    del _usage",
         ]), silent=True)
         
     #---------------------------------------------------------------------------
     # 'ConsoleWidget' public interface
     #---------------------------------------------------------------------------
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' public interface
     #---------------------------------------------------------------------------
 
     def execute_file(self, path, hidden=False):
         """ Reimplemented to use the 'run' magic.
         """
         # Use forward slashes on Windows to avoid escaping each separator.
         if sys.platform == 'win32':
             path = os.path.normpath(path).replace('\\', '/')
 
         # Perhaps we should not be using %run directly, but while we
         # are, it is necessary to quote or escape filenames containing spaces 
         # or quotes. 
         
         # In earlier code here, to minimize escaping, we sometimes quoted the 
         # filename with single quotes. But to do this, this code must be
         # platform-aware, because run uses shlex rather than python string
         # parsing, so that:
         # * In Win: single quotes can be used in the filename without quoting,
         #   and we cannot use single quotes to quote the filename.
         # * In *nix: we can escape double quotes in a double quoted filename,
         #   but can't escape single quotes in a single quoted filename.
         
         # So to keep this code non-platform-specific and simple, we now only
         # use double quotes to quote filenames, and escape when needed:
         if ' ' in path or "'" in path or '"' in path:
             path = '"%s"' % path.replace('"', '\\"')
         self.execute('%%run %s' % path, hidden=hidden)
 
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _complete(self):
         """ Reimplemented to support IPython's improved completion machinery.
         """
         # We let the kernel split the input line, so we *always* send an empty
         # text field. Readline-based frontends do get a real text field which
         # they can use.
         text = ''
 
         # Send the completion request to the kernel
         msg_id = self.kernel_client.shell_channel.complete(
             text,                                    # 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 _process_execute_error(self, msg):
         """ Reimplemented for IPython-style traceback formatting.
         """
         content = msg['content']
         traceback = '\n'.join(content['traceback']) + '\n'
         if False:
             # FIXME: For now, tracebacks come as plain text, so we can't use
             # the html renderer yet.  Once we refactor ultratb to produce
             # properly styled tracebacks, this branch should be the default
             traceback = traceback.replace(' ', '&nbsp;')
             traceback = traceback.replace('\n', '<br/>')
 
             ename = content['ename']
             ename_styled = '<span class="error">%s</span>' % ename
             traceback = traceback.replace(ename, ename_styled)
 
             self._append_html(traceback)
         else:
             # This is the fallback for now, using plain text with ansi escapes
             self._append_plain_text(traceback)
 
     def _process_execute_payload(self, item):
         """ Reimplemented to dispatch payloads to handler methods.
         """
         handler = self._payload_handlers.get(item['source'])
         if handler is None:
             # We have no handler for this type of payload, simply ignore it
             return False
         else:
             handler(item)
             return True
 
     def _show_interpreter_prompt(self, number=None):
         """ Reimplemented for IPython-style prompts.
         """
         # If a number was not specified, make a prompt number request.
         if number is None:
             msg_id = self.kernel_client.shell_channel.execute('', silent=True)
             info = self._ExecutionRequest(msg_id, 'prompt')
             self._request_info['execute'][msg_id] = info
             return
 
         # Show a new prompt and save information about it so that it can be
         # updated later if the prompt number turns out to be wrong.
         self._prompt_sep = self.input_sep
         self._show_prompt(self._make_in_prompt(number), html=True)
         block = self._control.document().lastBlock()
         length = len(self._prompt)
         self._previous_prompt_obj = self._PromptBlock(block, length, number)
 
         # Update continuation prompt to reflect (possibly) new prompt length.
         self._set_continuation_prompt(
             self._make_continuation_prompt(self._prompt), html=True)
 
     def _show_interpreter_prompt_for_reply(self, msg):
         """ Reimplemented for IPython-style prompts.
         """
         # Update the old prompt number if necessary.
         content = msg['content']
         # abort replies do not have any keys:
         if content['status'] == 'aborted':
             if self._previous_prompt_obj:
                 previous_prompt_number = self._previous_prompt_obj.number
             else:
                 previous_prompt_number = 0
         else:
             previous_prompt_number = content['execution_count']
         if self._previous_prompt_obj and \
                 self._previous_prompt_obj.number != previous_prompt_number:
             block = self._previous_prompt_obj.block
 
             # Make sure the prompt block has not been erased.
             if block.isValid() and block.text():
 
                 # Remove the old prompt and insert a new prompt.
                 cursor = QtGui.QTextCursor(block)
                 cursor.movePosition(QtGui.QTextCursor.Right,
                                     QtGui.QTextCursor.KeepAnchor,
                                     self._previous_prompt_obj.length)
                 prompt = self._make_in_prompt(previous_prompt_number)
                 self._prompt = self._insert_html_fetching_plain_text(
                     cursor, prompt)
 
                 # When the HTML is inserted, Qt blows away the syntax
                 # highlighting for the line, so we need to rehighlight it.
                 self._highlighter.rehighlightBlock(cursor.block())
 
             self._previous_prompt_obj = None
 
         # Show a new prompt with the kernel's estimated prompt number.
         self._show_interpreter_prompt(previous_prompt_number + 1)
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' interface
     #---------------------------------------------------------------------------
 
     def set_default_style(self, colors='lightbg'):
         """ Sets the widget style to the class defaults.
 
         Parameters:
         -----------
         colors : str, optional (default lightbg)
             Whether to use the default IPython light background or dark
             background or B&W style.
         """
         colors = colors.lower()
         if colors=='lightbg':
             self.style_sheet = styles.default_light_style_sheet
             self.syntax_style = styles.default_light_syntax_style
         elif colors=='linux':
             self.style_sheet = styles.default_dark_style_sheet
             self.syntax_style = styles.default_dark_syntax_style
         elif colors=='nocolor':
             self.style_sheet = styles.default_bw_style_sheet
             self.syntax_style = styles.default_bw_syntax_style
         else:
             raise KeyError("No such color scheme: %s"%colors)
 
     #---------------------------------------------------------------------------
     # 'IPythonWidget' protected interface
     #---------------------------------------------------------------------------
 
     def _edit(self, filename, line=None):
         """ Opens a Python script for editing.
 
         Parameters:
         -----------
         filename : str
             A path to a local system file.
 
         line : int, optional
             A line of interest in the file.
         """
         if self.custom_edit:
             self.custom_edit_requested.emit(filename, line)
         elif not self.editor:
             self._append_plain_text('No default editor available.\n'
             'Specify a GUI text editor in the `IPythonWidget.editor` '
             'configurable to enable the %edit magic')
         else:
             try:
                 filename = '"%s"' % filename
                 if line and self.editor_line:
                     command = self.editor_line.format(filename=filename,
                                                       line=line)
                 else:
                     try:
                         command = self.editor.format()
                     except KeyError:
                         command = self.editor.format(filename=filename)
                     else:
                         command += ' ' + filename
             except KeyError:
                 self._append_plain_text('Invalid editor command.\n')
             else:
                 try:
                     Popen(command, shell=True)
                 except OSError:
                     msg = 'Opening editor with command "%s" failed.\n'
                     self._append_plain_text(msg % command)
 
     def _make_in_prompt(self, number):
         """ Given a prompt number, returns an HTML In prompt.
         """
         try:
             body = self.in_prompt % number
         except TypeError:
             # allow in_prompt to leave out number, e.g. '>>> '
             body = self.in_prompt
         return '<span class="in-prompt">%s</span>' % body
 
     def _make_continuation_prompt(self, prompt):
         """ Given a plain text version of an In prompt, returns an HTML
             continuation prompt.
         """
         end_chars = '...: '
         space_count = len(prompt.lstrip('\n')) - len(end_chars)
         body = '&nbsp;' * space_count + end_chars
         return '<span class="in-prompt">%s</span>' % body
 
     def _make_out_prompt(self, number):
         """ Given a prompt number, returns an HTML Out prompt.
         """
         body = self.out_prompt % number
         return '<span class="out-prompt">%s</span>' % body
 
     #------ Payload handlers --------------------------------------------------
 
     # Payload handlers with a generic interface: each takes the opaque payload
     # dict, unpacks it and calls the underlying functions with the necessary
     # arguments.
 
     def _handle_payload_edit(self, item):
         self._edit(item['filename'], item['line_number'])
 
     def _handle_payload_exit(self, item):
         self._keep_kernel_on_exit = item['keepkernel']
         self.exit_requested.emit(self)
 
     def _handle_payload_next_input(self, item):
         self.input_buffer = dedent(item['text'].rstrip())
 
     def _handle_payload_page(self, item):
         # Since the plain text widget supports only a very small subset of HTML
         # and we have no control over the HTML source, we only page HTML
         # payloads in the rich text widget.
         if item['html'] and self.kind == 'rich':
             self._page(item['html'], html=True)
         else:
             self._page(item['text'], html=False)
 
     #------ Trait change handlers --------------------------------------------
 
     def _style_sheet_changed(self):
         """ Set the style sheets of the underlying widgets.
         """
         self.setStyleSheet(self.style_sheet)
         if self._control is not None:
             self._control.document().setDefaultStyleSheet(self.style_sheet)
             bg_color = self._control.palette().window().color()
             self._ansi_processor.set_background_color(bg_color)
         
         if self._page_control is not None:
             self._page_control.document().setDefaultStyleSheet(self.style_sheet)
 
 
 
     def _syntax_style_changed(self):
         """ Set the style for the syntax highlighter.
         """
         if self._highlighter is None:
             # ignore premature calls
             return
         if self.syntax_style:
             self._highlighter.set_style(self.syntax_style)
         else:
             self._highlighter.set_style_sheet(self.style_sheet)
 
     #------ Trait default initializers -----------------------------------------
 
     def _banner_default(self):
         from IPython.core.usage import default_gui_banner
         return default_gui_banner