Merge pull request #6227 from Carreau/cellt-g-event

Use global event for celltoolbar

IPython/html/static/notebook/js/celltoolbar.js

@@ -1,417 +1,416
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'base/js/namespace',
     'jquery',
-], function(IPython, $) {
+    'base/js/events'
+], function(IPython, $, events) {
     "use strict";
 
     var CellToolbar = function (options) {
         // Constructor
         //
         // Parameters:
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          cell: Cell instance
         //          notebook: Notebook instance 
         CellToolbar._instances.push(this);
         this.notebook = options.notebook;
-        this.events = options.events;
         this.cell = options.cell;
         this.create_element();
         this.rebuild();
         return this;
     };
 
 
     CellToolbar.prototype.create_element = function () {
         this.inner_element = $('<div/>').addClass('celltoolbar');
         this.element = $('<div/>').addClass('ctb_hideshow')
             .append(this.inner_element);
     };
 
 
     // The default css style for the outer celltoolbar div
     // (ctb_hideshow) is display: none.
     // To show the cell toolbar, *both* of the following conditions must be met:
     // - A parent container has class `ctb_global_show`
     // - The celltoolbar has the class `ctb_show`
     // This allows global show/hide, as well as per-cell show/hide.
 
     CellToolbar.global_hide = function () {
         $('body').removeClass('ctb_global_show');
     };
 
 
     CellToolbar.global_show = function () {
         $('body').addClass('ctb_global_show');
     };
 
 
     CellToolbar.prototype.hide = function () {
         this.element.removeClass('ctb_show');
     };
 
 
     CellToolbar.prototype.show = function () {
         this.element.addClass('ctb_show');
     };
 
 
     /**
      * Class variable that should contain a dict of all available callback
      * we need to think of wether or not we allow nested namespace
      * @property _callback_dict
      * @private
      * @static
      * @type Dict
      */
     CellToolbar._callback_dict = {};
 
 
     /**
      * Class variable that should contain the reverse order list of the button
      * to add to the toolbar of each cell
      * @property _ui_controls_list
      * @private
      * @static
      * @type List
      */
     CellToolbar._ui_controls_list = [];
 
 
     /**
      * Class variable that should contain the CellToolbar instances for each
      * cell of the notebook
      *
      * @private
      * @property _instances
      * @static
      * @type List
      */
     CellToolbar._instances = [];
 
 
     /**
      * keep a list of all the available presets for the toolbar
      * @private
      * @property _presets
      * @static
      * @type Dict
      */
     CellToolbar._presets = {};
 
 
     // this is by design not a prototype.
     /**
      * Register a callback to create an UI element in a cell toolbar.
      * @method register_callback
      * @param name {String} name to use to refer to the callback. It is advised to use a prefix with the name
      * for easier sorting and avoid collision
      * @param callback {function(div, cell)} callback that will be called to generate the ui element
      * @param [cell_types] {List of String|undefined} optional list of cell types. If present the UI element
      * will be added only to cells of types in the list.
      *
      *
      * The callback will receive the following element :
      *
      *    * a div in which to add element.
      *    * the cell it is responsible from
      *
      * @example
      *
      * Example that create callback for a button that toggle between `true` and `false` label,
      * with the metadata under the key 'foo' to reflect the status of the button.
      *
      *      // first param reference to a DOM div
      *      // second param reference to the cell.
      *      var toggle =  function(div, cell) {
      *          var button_container = $(div)
      *
      *          // let's create a button that show the  current value of the metadata
      *          var button = $('<div/>').button({label:String(cell.metadata.foo)});
      *
      *          // On click, change the metadata value and update the button label
      *          button.click(function(){
      *                      var v = cell.metadata.foo;
      *                      cell.metadata.foo = !v;
      *                      button.button("option", "label", String(!v));
      *                  })
      *
      *          // add the button to the DOM div.
      *          button_container.append(button);
      *      }
      *
      *      // now we register the callback under the name `foo` to give the
      *      // user the ability to use it later
      *      CellToolbar.register_callback('foo', toggle);
      */
     CellToolbar.register_callback = function(name, callback, cell_types) {
         // Overwrite if it already exists.
         CellToolbar._callback_dict[name] = cell_types ? {callback: callback, cell_types: cell_types} : callback;
     };
 
 
     /**
      * Register a preset of UI element in a cell toolbar.
      * Not supported Yet.
      * @method register_preset
      * @param name {String} name to use to refer to the preset. It is advised to use a prefix with the name
      * for easier sorting and avoid collision
      * @param  preset_list {List of String} reverse order of the button in the toolbar. Each String of the list
      *          should correspond to a name of a registerd callback.
      *
      * @private
      * @example
      *
      *      CellToolbar.register_callback('foo.c1', function(div, cell){...});
      *      CellToolbar.register_callback('foo.c2', function(div, cell){...});
      *      CellToolbar.register_callback('foo.c3', function(div, cell){...});
      *      CellToolbar.register_callback('foo.c4', function(div, cell){...});
      *      CellToolbar.register_callback('foo.c5', function(div, cell){...});
      *
      *      CellToolbar.register_preset('foo.foo_preset1', ['foo.c1', 'foo.c2', 'foo.c5'])
      *      CellToolbar.register_preset('foo.foo_preset2', ['foo.c4', 'foo.c5'])
      */
-    CellToolbar.register_preset = function(name, preset_list, notebook, events) {
+    CellToolbar.register_preset = function(name, preset_list, notebook) {
         CellToolbar._presets[name] = preset_list;
         events.trigger('preset_added.CellToolbar', {name: name});
         // When "register_callback" is called by a custom extension, it may be executed after notebook is loaded.
         // In that case, activate the preset if needed.
-        if (notebook && notebook.metadata && notebook.metadata.celltoolbar === name)
-            CellToolbar.activate_preset(name, events);
+        if (notebook && notebook.metadata && notebook.metadata.celltoolbar === name){
+            CellToolbar.activate_preset(name);
+        }
     };
 
 
     /**
      * List the names of the presets that are currently registered.
      *
      * @method list_presets
      * @static
      */
     CellToolbar.list_presets = function() {
         var keys = [];
         for (var k in CellToolbar._presets) {
             keys.push(k);
         }
         return keys;
     };
 
 
     /**
      * Activate an UI preset from `register_preset`
      *
      * This does not update the selection UI.
      *
      * @method activate_preset
      * @param preset_name {String} string corresponding to the preset name
      *
      * @static
      * @private
      * @example
      *
      *      CellToolbar.activate_preset('foo.foo_preset1');
      */
-    CellToolbar.activate_preset = function(preset_name, events){
+    CellToolbar.activate_preset = function(preset_name){
         var preset = CellToolbar._presets[preset_name];
 
         if(preset !== undefined){
             CellToolbar._ui_controls_list = preset;
             CellToolbar.rebuild_all();
         }
 
-        if (events) {
-            events.trigger('preset_activated.CellToolbar', {name: preset_name});
-        }
+        events.trigger('preset_activated.CellToolbar', {name: preset_name});
     };
 
 
     /**
      * This should be called on the class and not on a instance as it will trigger
      * rebuild of all the instances.
      * @method rebuild_all
      * @static
      *
      */
     CellToolbar.rebuild_all = function(){
         for(var i=0; i < CellToolbar._instances.length; i++){
             CellToolbar._instances[i].rebuild();
         }
     };
 
     /**
      * Rebuild all the button on the toolbar to update its state.
      * @method rebuild
      */
     CellToolbar.prototype.rebuild = function(){
         // strip evrything from the div
         // which is probably inner_element
         // or this.element.
         this.inner_element.empty();
         this.ui_controls_list = [];
 
         var callbacks = CellToolbar._callback_dict;
         var preset = CellToolbar._ui_controls_list;
         // Yes we iterate on the class variable, not the instance one.
         for (var i=0; i < preset.length; i++) {
             var key = preset[i];
             var callback = callbacks[key];
             if (!callback) continue;
 
             if (typeof callback === 'object') {
                 if (callback.cell_types.indexOf(this.cell.cell_type) === -1) continue;
                 callback = callback.callback;
             }
             
             var local_div = $('<div/>').addClass('button_container');
             try {
                 callback(local_div, this.cell, this);
                 this.ui_controls_list.push(key);
             } catch (e) {
                 console.log("Error in cell toolbar callback " + key, e);
                 continue;
             }
             // only append if callback succeeded.
             this.inner_element.append(local_div);
         }
 
         // If there are no controls or the cell is a rendered TextCell hide the toolbar.
         if (!this.ui_controls_list.length || (this.cell.cell_type != 'code' && this.cell.rendered)) {
             this.hide();
         } else {
             this.show();
         }
     };
 
 
     /**
      */
     CellToolbar.utils = {};
 
 
     /**
      * A utility function to generate bindings between a checkbox and cell/metadata
      * @method utils.checkbox_ui_generator
      * @static
      *
      * @param name {string} Label in front of the checkbox
      * @param setter {function( cell, newValue )}
      *        A setter method to set the newValue
      * @param getter {function( cell )}
      *        A getter methods which return the current value.
      *
      * @return callback {function( div, cell )} Callback to be passed to `register_callback`
      *
      * @example
      *
      * An exmple that bind the subkey `slideshow.isSectionStart` to a checkbox with a `New Slide` label
      *
      *     var newSlide = CellToolbar.utils.checkbox_ui_generator('New Slide',
      *          // setter
      *          function(cell, value){
      *              // we check that the slideshow namespace exist and create it if needed
      *              if (cell.metadata.slideshow == undefined){cell.metadata.slideshow = {}}
      *              // set the value
      *              cell.metadata.slideshow.isSectionStart = value
      *              },
      *          //geter
      *          function(cell){ var ns = cell.metadata.slideshow;
      *              // if the slideshow namespace does not exist return `undefined`
      *              // (will be interpreted as `false` by checkbox) otherwise
      *              // return the value
      *              return (ns == undefined)? undefined: ns.isSectionStart
      *              }
      *      );
      *
      *      CellToolbar.register_callback('newSlide', newSlide);
      *
      */
     CellToolbar.utils.checkbox_ui_generator = function(name, setter, getter){
         return function(div, cell, celltoolbar) {
             var button_container = $(div);
 
             var chkb = $('<input/>').attr('type', 'checkbox');
             var lbl = $('<label/>').append($('<span/>').text(name));
             lbl.append(chkb);
             chkb.attr("checked", getter(cell));
 
             chkb.click(function(){
                         var v = getter(cell);
                         setter(cell, !v);
                         chkb.attr("checked", !v);
             });
             button_container.append($('<span/>').append(lbl));
         };
     };
 
 
     /**
      * A utility function to generate bindings between a dropdown list cell
      * @method utils.select_ui_generator
      * @static
      *
      * @param list_list {list of sublist} List of sublist of metadata value and name in the dropdown list.
      *        subslit shoud contain 2 element each, first a string that woul be displayed in the dropdown list,
      *        and second the corresponding value to  be passed to setter/return by getter. the corresponding value 
      *        should not be "undefined" or behavior can be unexpected.
      * @param setter {function( cell, newValue )}
      *        A setter method to set the newValue
      * @param getter {function( cell )}
      *        A getter methods which return the current value of the metadata.
      * @param [label=""] {String} optionnal label for the dropdown menu
      *
      * @return callback {function( div, cell )} Callback to be passed to `register_callback`
      *
      * @example
      *
      *      var select_type = CellToolbar.utils.select_ui_generator([
      *              ["<None>"       , "None"      ],
      *              ["Header Slide" , "header_slide" ],
      *              ["Slide"        , "slide"        ],
      *              ["Fragment"     , "fragment"     ],
      *              ["Skip"         , "skip"         ],
      *              ],
      *              // setter
      *              function(cell, value){
      *                  // we check that the slideshow namespace exist and create it if needed
      *                  if (cell.metadata.slideshow == undefined){cell.metadata.slideshow = {}}
      *                  // set the value
      *                  cell.metadata.slideshow.slide_type = value
      *                  },
      *              //geter
      *              function(cell){ var ns = cell.metadata.slideshow;
      *                  // if the slideshow namespace does not exist return `undefined`
      *                  // (will be interpreted as `false` by checkbox) otherwise
      *                  // return the value
      *                  return (ns == undefined)? undefined: ns.slide_type
      *                  }
      *      CellToolbar.register_callback('slideshow.select', select_type);
      *
      */
     CellToolbar.utils.select_ui_generator = function(list_list, setter, getter, label) {
         label = label || "";
         return function(div, cell, celltoolbar) {
             var button_container = $(div);
             var lbl = $("<label/>").append($('<span/>').text(label));
             var select = $('<select/>').addClass('ui-widget ui-widget-content');
             for(var i=0; i < list_list.length; i++){
                 var opt = $('<option/>')
                     .attr('value', list_list[i][1])
                     .text(list_list[i][0]);
                 select.append(opt);
             }
             select.val(getter(cell));
             select.change(function(){
                         setter(cell, select.val());
                     });
             button_container.append($('<span/>').append(lbl).append(select));
         };
     };
 
     // Backwards compatability.
     IPython.CellToolbar = CellToolbar;
 
     return {'CellToolbar': CellToolbar};
 });

IPython/html/static/notebook/js/celltoolbarpresets/default.js

@@ -1,51 +1,51
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'jquery',
     'notebook/js/celltoolbar',
     'base/js/dialog',
 ], function($, celltoolbar, dialog) {
     "use strict";
 
     var CellToolbar = celltoolbar.CellToolbar;
 
     var raw_edit = function (cell) {
         dialog.edit_metadata({
             md: cell.metadata,
             callback: function (md) {
                 cell.metadata = md;
             },
             name: 'Cell',
             notebook: this.notebook,
             keyboard_manager: this.keyboard_manager
         });
     };
 
     var add_raw_edit_button = function(div, cell) {
         var button_container = $(div);
         var button = $('<button/>')
             .addClass("btn btn-default btn-xs")
             .text("Edit Metadata")
             .click( function () {
                 raw_edit(cell);
                 return false;
             });
         button_container.append(button);
     };
 
-    var register = function (notebook, events) {
+    var register = function (notebook) {
         CellToolbar.register_callback('default.rawedit', add_raw_edit_button);
         raw_edit = $.proxy(raw_edit, {
             notebook: notebook,
             keyboard_manager: notebook.keyboard_manager
         });
 
         var example_preset = [];
         example_preset.push('default.rawedit');
 
-        CellToolbar.register_preset('Edit Metadata', example_preset, notebook, events);
+        CellToolbar.register_preset('Edit Metadata', example_preset, notebook);
         console.log('Default extension for cell metadata editing loaded.');
     };
     return {'register': register};
 });

IPython/html/static/notebook/js/celltoolbarpresets/example.js

@@ -1,148 +1,148
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 // Example Use for the CellToolbar library
 // add the following to your custom.js to load
 // Celltoolbar UI for slideshow
 
 // ```
 // $.getScript('/static/js/celltoolbarpresets/example.js');
 // ```
 define([
     'jquery',
     'notebook/js/celltoolbar',
 ], function($, celltoolbar) {
     "use strict";
 
     var CellToolbar = celltoolbar.CellToolbar;
 
     var example_preset = [];
 
     var simple_button = function(div, cell) {
         var button_container = $(div);
         var button = $('<div/>').button({icons:{primary:'ui-icon-locked'}});
         var fun = function(value){
                 try{
                     if(value){
                         cell.code_mirror.setOption('readOnly','nocursor');
                         button.button('option','icons',{primary:'ui-icon-locked'});
                     } else {
                         cell.code_mirror.setOption('readOnly',false);
                         button.button('option','icons',{primary:'ui-icon-unlocked'});
                     }
                 } catch(e){}
 
         };
             fun(cell.metadata.ro);
             button.click(function(){
                     var v = cell.metadata.ro;
                     var locked = !v;
                     cell.metadata.ro = locked;
                     fun(locked);
                     })
                 .css('height','16px')
                 .css('width','35px');
         button_container.append(button);
     };
 
     CellToolbar.register_callback('example.lock',simple_button);
     example_preset.push('example.lock');
 
     var toggle_test =  function(div, cell) {
         var button_container = $(div);
         var button = $('<div/>')
             .button({label:String(cell.metadata.foo)}).
             css('width','65px');
         button.click(function(){
                     var v = cell.metadata.foo;
                     cell.metadata.foo = !v;
                     button.button("option","label",String(!v));
                 });
        button_container.append(button);
     };
 
     CellToolbar.register_callback('example.toggle',toggle_test);
     example_preset.push('example.toggle');
 
     var checkbox_test = CellToolbar.utils.checkbox_ui_generator('Yes/No',
          // setter
          function(cell, value){
              // we check that the slideshow namespace exist and create it if needed
              if (cell.metadata.yn_test === undefined){cell.metadata.yn_test = {};}
              // set the value
              cell.metadata.yn_test.value = value;
              },
          //geter
          function(cell){ var ns = cell.metadata.yn_test;
              // if the slideshow namespace does not exist return `undefined`
              // (will be interpreted as `false` by checkbox) otherwise
              // return the value
              return (ns === undefined)? undefined: ns.value;
              }
     );
 
 
     CellToolbar.register_callback('example.checkbox',checkbox_test);
     example_preset.push('example.checkbox');
 
     var select_test = CellToolbar.utils.select_ui_generator([
             ["-"            ,undefined      ],
             ["Header Slide" ,"header_slide" ],
             ["Slide"        ,"slide"        ],
             ["Fragment"     ,"fragment"     ],
             ["Skip"         ,"skip"         ],
             ],
             // setter
             function(cell,value){
                 // we check that the slideshow namespace exist and create it if needed
                 if (cell.metadata.test === undefined){cell.metadata.test = {};}
                 // set the value
                 cell.metadata.test.slide_type = value;
                 },
             //geter
             function(cell){ var ns = cell.metadata.test;
                 // if the slideshow namespace does not exist return `undefined`
                 // (will be interpreted as `false` by checkbox) otherwise
                 // return the value
                 return (ns === undefined)? undefined: ns.slide_type;
                 });
 
     CellToolbar.register_callback('example.select',select_test);
     example_preset.push('example.select');
 
     var simple_dialog = function(title,text){
         var dlg = $('<div/>').attr('title',title)
             .append($('<p/>').text(text));
         $(dlg).dialog({
                 autoOpen: true,
                 height: 300,
                 width: 650,
                 modal: true,
                 close: function() {
                     //cleanup on close
                     $(this).remove();
                 }
         });
     };
 
     var add_simple_dialog_button = function(div, cell) {
         var help_text = ["This is the Metadata editting UI.",
                          "It heavily rely on plugin to work ",
                          "and is still under developpement. You shouldn't wait too long before",
                          " seeing some customisable buttons in those toolbar."
                         ].join('\n');
         var button_container = $(div);
         var button = $('<div/>').button({label:'?'})
                 .click(function(){simple_dialog('help',help_text); return false;});
         button_container.append(button);
     };
 
-    var register = function (notebook, events) {
+    var register = function (notebook) {
         CellToolbar.register_callback('example.help',add_simple_dialog_button);
         example_preset.push('example.help');
 
-        CellToolbar.register_preset('Example',example_preset, notebook, events);
+        CellToolbar.register_preset('Example',example_preset, notebook);
         console.log('Example extension for metadata editing loaded.');
     };
     return {'register': register};
 });

IPython/html/static/notebook/js/celltoolbarpresets/rawcell.js

@@ -1,86 +1,86
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'jquery',
     'notebook/js/celltoolbar',
     'base/js/dialog',
     'base/js/keyboard',
 ], function($, celltoolbar, dialog, keyboard) {
     "use strict";
 
   var CellToolbar = celltoolbar.CellToolbar;
   var raw_cell_preset = [];
 
   var select_type = CellToolbar.utils.select_ui_generator([
     ["None", "-"],
     ["LaTeX", "text/latex"],
     ["reST", "text/restructuredtext"],
     ["HTML", "text/html"],
     ["Markdown", "text/markdown"],
     ["Python", "text/x-python"],
     ["Custom", "dialog"],
 
     ],
       // setter
       function(cell, value) {
         if (value === "-") {
           delete cell.metadata.raw_mimetype;
         } else if (value === 'dialog'){
             var dialog = $('<div/>').append(
                 $("<p/>")
                     .text("Set the MIME type of the raw cell:")
             ).append(
                 $("<br/>")
             ).append(
                 $('<input/>').attr('type','text').attr('size','25')
                 .val(cell.metadata.raw_mimetype || "-")
             );
             dialog.modal({
                 title: "Raw Cell MIME Type",
                 body: dialog,
                 buttons : {
                     "Cancel": {},
                     "OK": {
                         class: "btn-primary",
                         click: function () {
                             console.log(cell);
                             cell.metadata.raw_mimetype = $(this).find('input').val();
                             console.log(cell.metadata);
                         }
                     }
                 },
                 open : function (event, ui) {
                     var that = $(this);
                     // Upon ENTER, click the OK button.
                     that.find('input[type="text"]').keydown(function (event, ui) {
                         if (event.which === keyboard.keycodes.enter) {
                             that.find('.btn-primary').first().click();
                             return false;
                         }
                     });
                     that.find('input[type="text"]').focus().select();
                 }
             });
         } else {
           cell.metadata.raw_mimetype = value;
         }
       },
       //getter
       function(cell) {
         return cell.metadata.raw_mimetype || "";
       },
       // name
       "Raw NBConvert Format"
   );
 
-  var register = function (notebook, events) {
+  var register = function (notebook) {
     CellToolbar.register_callback('raw_cell.select', select_type, ['raw']);
     raw_cell_preset.push('raw_cell.select');
 
-    CellToolbar.register_preset('Raw Cell Format', raw_cell_preset, notebook, events);
+    CellToolbar.register_preset('Raw Cell Format', raw_cell_preset, notebook);
     console.log('Raw Cell Format toolbar preset loaded.');
   };
   return {'register': register};
 
 });

IPython/html/static/notebook/js/celltoolbarpresets/slideshow.js

@@ -1,46 +1,46
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'jquery',
     'notebook/js/celltoolbar',
 ], function($, celltoolbar) {
     "use strict";
 
 
     var CellToolbar = celltoolbar.CellToolbar;
     var slideshow_preset = [];
 
     var select_type = CellToolbar.utils.select_ui_generator([
             ["-"            ,"-"            ],
             ["Slide"        ,"slide"        ],
             ["Sub-Slide"    ,"subslide"     ],
             ["Fragment"     ,"fragment"     ],
             ["Skip"         ,"skip"         ],
             ["Notes"        ,"notes"        ],
             ],
             // setter
             function(cell, value){
                 // we check that the slideshow namespace exist and create it if needed
                 if (cell.metadata.slideshow === undefined){cell.metadata.slideshow = {};}
                 // set the value
                 cell.metadata.slideshow.slide_type = value;
                 },
             //geter
             function(cell){ var ns = cell.metadata.slideshow;
                 // if the slideshow namespace does not exist return `undefined`
                 // (will be interpreted as `false` by checkbox) otherwise
                 // return the value
                 return (ns === undefined)? undefined: ns.slide_type;
                 },
             "Slide Type");
 
-    var register = function (notebook, events) {
+    var register = function (notebook) {
         CellToolbar.register_callback('slideshow.select',select_type);
         slideshow_preset.push('slideshow.select');
 
-        CellToolbar.register_preset('Slideshow',slideshow_preset, notebook, events);
+        CellToolbar.register_preset('Slideshow',slideshow_preset, notebook);
         console.log('Slideshow extension for metadata editing loaded.');
     };
     return {'register': register};
 });

IPython/html/static/notebook/js/codecell.js

@@ -1,526 +1,525
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'base/js/namespace',
     'jquery',
     'base/js/utils',
     'base/js/keyboard',
     'notebook/js/cell',
     'notebook/js/outputarea',
     'notebook/js/completer',
     'notebook/js/celltoolbar',
 ], function(IPython, $, utils, keyboard, cell, outputarea, completer, celltoolbar) {
     "use strict";
     var Cell = cell.Cell;
 
     /* local util for codemirror */
     var posEq = function(a, b) {return a.line == b.line && a.ch == b.ch;};
 
     /**
      *
      * function to delete until previous non blanking space character
      * or first multiple of 4 tabstop.
      * @private
      */
     CodeMirror.commands.delSpaceToPrevTabStop = function(cm){
         var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
         if (!posEq(from, to)) { cm.replaceRange("", from, to); return; }
         var cur = cm.getCursor(), line = cm.getLine(cur.line);
         var tabsize = cm.getOption('tabSize');
         var chToPrevTabStop = cur.ch-(Math.ceil(cur.ch/tabsize)-1)*tabsize;
         from = {ch:cur.ch-chToPrevTabStop,line:cur.line};
         var select = cm.getRange(from,cur);
         if( select.match(/^\ +$/) !== null){
             cm.replaceRange("",from,cur);
         } else {
             cm.deleteH(-1,"char");
         }
     };
 
     var keycodes = keyboard.keycodes;
 
     var CodeCell = function (kernel, options) {
         // Constructor
         //
         // A Cell conceived to write code.
         //
         // Parameters:
         //  kernel: Kernel instance
         //      The kernel doesn't have to be set at creation time, in that case
         //      it will be null and set_kernel has to be called later.
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          config: dictionary
         //          keyboard_manager: KeyboardManager instance 
         //          notebook: Notebook instance
         //          tooltip: Tooltip instance
         this.kernel = kernel || null;
         this.notebook = options.notebook;
         this.collapsed = false;
         this.events = options.events;
         this.tooltip = options.tooltip;
         this.config = options.config;
 
         // create all attributed in constructor function
         // even if null for V8 VM optimisation
         this.input_prompt_number = null;
         this.celltoolbar = null;
         this.output_area = null;
         this.last_msg_id = null;
         this.completer = null;
 
 
         var cm_overwrite_options  = {
             onKeyEvent: $.proxy(this.handle_keyevent,this)
         };
 
         var config = this.mergeopt(CodeCell, this.config, {cm_config: cm_overwrite_options});
         Cell.apply(this,[{
             config: config, 
             keyboard_manager: options.keyboard_manager, 
             events: this.events}]);
 
         // Attributes we want to override in this subclass.
         this.cell_type = "code";
 
         var that = this;
         this.element.focusout(
             function() { that.auto_highlight(); }
         );
     };
 
     CodeCell.options_default = {
         cm_config : {
             extraKeys: {
                 "Tab" :  "indentMore",
                 "Shift-Tab" : "indentLess",
                 "Backspace" : "delSpaceToPrevTabStop",
                 "Cmd-/" : "toggleComment",
                 "Ctrl-/" : "toggleComment"
             },
             mode: 'ipython',
             theme: 'ipython',
             matchBrackets: true,
              // don't auto-close strings because of CodeMirror #2385
             autoCloseBrackets: "()[]{}"
         }
     };
 
     CodeCell.msg_cells = {};
 
     CodeCell.prototype = new Cell();
 
     /**
      * @method auto_highlight
      */
     CodeCell.prototype.auto_highlight = function () {
         this._auto_highlight(this.config.cell_magic_highlight);
     };
 
     /** @method create_element */
     CodeCell.prototype.create_element = function () {
         Cell.prototype.create_element.apply(this, arguments);
 
         var cell =  $('<div></div>').addClass('cell border-box-sizing code_cell');
         cell.attr('tabindex','2');
 
         var input = $('<div></div>').addClass('input');
         var prompt = $('<div/>').addClass('prompt input_prompt');
         var inner_cell = $('<div/>').addClass('inner_cell');
         this.celltoolbar = new celltoolbar.CellToolbar({
             cell: this, 
-            events: this.events, 
             notebook: this.notebook});
         inner_cell.append(this.celltoolbar.element);
         var input_area = $('<div/>').addClass('input_area');
         this.code_mirror = new CodeMirror(input_area.get(0), this.cm_config);
         $(this.code_mirror.getInputField()).attr("spellcheck", "false");
         inner_cell.append(input_area);
         input.append(prompt).append(inner_cell);
 
         var widget_area = $('<div/>')
             .addClass('widget-area')
             .hide();
         this.widget_area = widget_area;
         var widget_prompt = $('<div/>')
             .addClass('prompt')
             .appendTo(widget_area);
         var widget_subarea = $('<div/>')
             .addClass('widget-subarea')
             .appendTo(widget_area);
         this.widget_subarea = widget_subarea;
         var widget_clear_buton = $('<button />')
             .addClass('close')
             .html('&times;')
             .click(function() {
                 widget_area.slideUp('', function(){ widget_subarea.html(''); });
                 })
             .appendTo(widget_prompt);
 
         var output = $('<div></div>');
         cell.append(input).append(widget_area).append(output);
         this.element = cell;
         this.output_area = new outputarea.OutputArea({
             selector: output, 
             prompt_area: true, 
             events: this.events, 
             keyboard_manager: this.keyboard_manager});
         this.completer = new completer.Completer(this, this.events);
     };
 
     /** @method bind_events */
     CodeCell.prototype.bind_events = function () {
         Cell.prototype.bind_events.apply(this);
         var that = this;
 
         this.element.focusout(
             function() { that.auto_highlight(); }
         );
     };
 
 
     /**
      *  This method gets called in CodeMirror's onKeyDown/onKeyPress
      *  handlers and is used to provide custom key handling. Its return
      *  value is used to determine if CodeMirror should ignore the event:
      *  true = ignore, false = don't ignore.
      *  @method handle_codemirror_keyevent
      */
     CodeCell.prototype.handle_codemirror_keyevent = function (editor, event) {
 
         var that = this;
         // whatever key is pressed, first, cancel the tooltip request before
         // they are sent, and remove tooltip if any, except for tab again
         var tooltip_closed = null;
         if (event.type === 'keydown' && event.which != keycodes.tab ) {
             tooltip_closed = this.tooltip.remove_and_cancel_tooltip();
         }
 
         var cur = editor.getCursor();
         if (event.keyCode === keycodes.enter){
             this.auto_highlight();
         }
 
         if (event.which === keycodes.down && event.type === 'keypress' && this.tooltip.time_before_tooltip >= 0) {
             // triger on keypress (!) otherwise inconsistent event.which depending on plateform
             // browser and keyboard layout !
             // Pressing '(' , request tooltip, don't forget to reappend it
             // The second argument says to hide the tooltip if the docstring
             // is actually empty
             this.tooltip.pending(that, true);
         } else if ( tooltip_closed && event.which === keycodes.esc && event.type === 'keydown') {
             // If tooltip is active, cancel it.  The call to
             // remove_and_cancel_tooltip above doesn't pass, force=true.
             // Because of this it won't actually close the tooltip
             // if it is in sticky mode. Thus, we have to check again if it is open
             // and close it with force=true.
             if (!this.tooltip._hidden) {
                 this.tooltip.remove_and_cancel_tooltip(true);
             }
             // If we closed the tooltip, don't let CM or the global handlers
             // handle this event.
             event.stop();
             return true;
         } else if (event.keyCode === keycodes.tab && event.type === 'keydown' && event.shiftKey) {
                 if (editor.somethingSelected()){
                     var anchor = editor.getCursor("anchor");
                     var head = editor.getCursor("head");
                     if( anchor.line != head.line){
                         return false;
                     }
                 }
                 this.tooltip.request(that);
                 event.stop();
                 return true;
         } else if (event.keyCode === keycodes.tab && event.type == 'keydown') {
             // Tab completion.
             this.tooltip.remove_and_cancel_tooltip();
             if (editor.somethingSelected()) {
                 return false;
             }
             var pre_cursor = editor.getRange({line:cur.line,ch:0},cur);
             if (pre_cursor.trim() === "") {
                 // Don't autocomplete if the part of the line before the cursor
                 // is empty.  In this case, let CodeMirror handle indentation.
                 return false;
             } else {
                 event.stop();
                 this.completer.startCompletion();
                 return true;
             }
         } 
         
         // keyboard event wasn't one of those unique to code cells, let's see
         // if it's one of the generic ones (i.e. check edit mode shortcuts)
         return Cell.prototype.handle_codemirror_keyevent.apply(this, [editor, event]);
     };
 
     // Kernel related calls.
 
     CodeCell.prototype.set_kernel = function (kernel) {
         this.kernel = kernel;
     };
 
     /**
      * Execute current code cell to the kernel
      * @method execute
      */
     CodeCell.prototype.execute = function () {
         this.output_area.clear_output();
         
         // Clear widget area
         this.widget_subarea.html('');
         this.widget_subarea.height('');
         this.widget_area.height('');
         this.widget_area.hide();
 
         this.set_input_prompt('*');
         this.element.addClass("running");
         if (this.last_msg_id) {
             this.kernel.clear_callbacks_for_msg(this.last_msg_id);
         }
         var callbacks = this.get_callbacks();
         
         var old_msg_id = this.last_msg_id;
         this.last_msg_id = this.kernel.execute(this.get_text(), callbacks, {silent: false, store_history: true});
         if (old_msg_id) {
             delete CodeCell.msg_cells[old_msg_id];
         }
         CodeCell.msg_cells[this.last_msg_id] = this;
     };
     
     /**
      * Construct the default callbacks for
      * @method get_callbacks
      */
     CodeCell.prototype.get_callbacks = function () {
         return {
             shell : {
                 reply : $.proxy(this._handle_execute_reply, this),
                 payload : {
                     set_next_input : $.proxy(this._handle_set_next_input, this),
                     page : $.proxy(this._open_with_pager, this)
                 }
             },
             iopub : {
                 output : $.proxy(this.output_area.handle_output, this.output_area),
                 clear_output : $.proxy(this.output_area.handle_clear_output, this.output_area),
             },
             input : $.proxy(this._handle_input_request, this)
         };
     };
     
     CodeCell.prototype._open_with_pager = function (payload) {
         this.events.trigger('open_with_text.Pager', payload);
     };
 
     /**
      * @method _handle_execute_reply
      * @private
      */
     CodeCell.prototype._handle_execute_reply = function (msg) {
         this.set_input_prompt(msg.content.execution_count);
         this.element.removeClass("running");
         this.events.trigger('set_dirty.Notebook', {value: true});
     };
 
     /**
      * @method _handle_set_next_input
      * @private
      */
     CodeCell.prototype._handle_set_next_input = function (payload) {
         var data = {'cell': this, 'text': payload.text};
         this.events.trigger('set_next_input.Notebook', data);
     };
 
     /**
      * @method _handle_input_request
      * @private
      */
     CodeCell.prototype._handle_input_request = function (msg) {
         this.output_area.append_raw_input(msg);
     };
 
 
     // Basic cell manipulation.
 
     CodeCell.prototype.select = function () {
         var cont = Cell.prototype.select.apply(this);
         if (cont) {
             this.code_mirror.refresh();
             this.auto_highlight();
         }
         return cont;
     };
 
     CodeCell.prototype.render = function () {
         var cont = Cell.prototype.render.apply(this);
         // Always execute, even if we are already in the rendered state
         return cont;
     };
     
     CodeCell.prototype.unrender = function () {
         // CodeCell is always rendered
         return false;
     };
 
     CodeCell.prototype.select_all = function () {
         var start = {line: 0, ch: 0};
         var nlines = this.code_mirror.lineCount();
         var last_line = this.code_mirror.getLine(nlines-1);
         var end = {line: nlines-1, ch: last_line.length};
         this.code_mirror.setSelection(start, end);
     };
 
 
     CodeCell.prototype.collapse_output = function () {
         this.collapsed = true;
         this.output_area.collapse();
     };
 
 
     CodeCell.prototype.expand_output = function () {
         this.collapsed = false;
         this.output_area.expand();
         this.output_area.unscroll_area();
     };
 
     CodeCell.prototype.scroll_output = function () {
         this.output_area.expand();
         this.output_area.scroll_if_long();
     };
 
     CodeCell.prototype.toggle_output = function () {
         this.collapsed = Boolean(1 - this.collapsed);
         this.output_area.toggle_output();
     };
 
     CodeCell.prototype.toggle_output_scroll = function () {
         this.output_area.toggle_scroll();
     };
 
 
     CodeCell.input_prompt_classical = function (prompt_value, lines_number) {
         var ns;
         if (prompt_value === undefined) {
             ns = "&nbsp;";
         } else {
             ns = encodeURIComponent(prompt_value);
         }
         return 'In&nbsp;[' + ns + ']:';
     };
 
     CodeCell.input_prompt_continuation = function (prompt_value, lines_number) {
         var html = [CodeCell.input_prompt_classical(prompt_value, lines_number)];
         for(var i=1; i < lines_number; i++) {
             html.push(['...:']);
         }
         return html.join('<br/>');
     };
 
     CodeCell.input_prompt_function = CodeCell.input_prompt_classical;
 
 
     CodeCell.prototype.set_input_prompt = function (number) {
         var nline = 1;
         if (this.code_mirror !== undefined) {
            nline = this.code_mirror.lineCount();
         }
         this.input_prompt_number = number;
         var prompt_html = CodeCell.input_prompt_function(this.input_prompt_number, nline);
         // This HTML call is okay because the user contents are escaped.
         this.element.find('div.input_prompt').html(prompt_html);
     };
 
 
     CodeCell.prototype.clear_input = function () {
         this.code_mirror.setValue('');
     };
 
 
     CodeCell.prototype.get_text = function () {
         return this.code_mirror.getValue();
     };
 
 
     CodeCell.prototype.set_text = function (code) {
         return this.code_mirror.setValue(code);
     };
 
 
     CodeCell.prototype.clear_output = function (wait) {
         this.output_area.clear_output(wait);
         this.set_input_prompt();
     };
 
 
     // JSON serialization
 
     CodeCell.prototype.fromJSON = function (data) {
         Cell.prototype.fromJSON.apply(this, arguments);
         if (data.cell_type === 'code') {
             if (data.input !== undefined) {
                 this.set_text(data.input);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 this.code_mirror.clearHistory();
                 this.auto_highlight();
             }
             if (data.prompt_number !== undefined) {
                 this.set_input_prompt(data.prompt_number);
             } else {
                 this.set_input_prompt();
             }
             this.output_area.trusted = data.trusted || false;
             this.output_area.fromJSON(data.outputs);
             if (data.collapsed !== undefined) {
                 if (data.collapsed) {
                     this.collapse_output();
                 } else {
                     this.expand_output();
                 }
             }
         }
     };
 
 
     CodeCell.prototype.toJSON = function () {
         var data = Cell.prototype.toJSON.apply(this);
         data.input = this.get_text();
         // is finite protect against undefined and '*' value
         if (isFinite(this.input_prompt_number)) {
             data.prompt_number = this.input_prompt_number;
         }
         var outputs = this.output_area.toJSON();
         data.outputs = outputs;
         data.language = 'python';
         data.trusted = this.output_area.trusted;
         data.collapsed = this.collapsed;
         return data;
     };
 
     /**
      * handle cell level logic when a cell is unselected
      * @method unselect
      * @return is the action being taken
      */
     CodeCell.prototype.unselect = function () {
         var cont = Cell.prototype.unselect.apply(this);
         if (cont) {
             // When a code cell is usnelected, make sure that the corresponding
             // tooltip and completer to that cell is closed.
             this.tooltip.remove_and_cancel_tooltip(true);
             if (this.completer !== null) {
                 this.completer.close();
             }
         }
         return cont;
     };
 
     // Backwards compatability.
     IPython.CodeCell = CodeCell;
 
     return {'CodeCell': CodeCell};
 });

IPython/html/static/notebook/js/notebook.js

@@ -1,2589 +1,2589
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'base/js/namespace',
     'jquery',
     'base/js/utils',
     'base/js/dialog',
     'notebook/js/textcell',
     'notebook/js/codecell',
     'services/sessions/js/session',
     'notebook/js/celltoolbar',
     'components/marked/lib/marked',
     'highlight',
     'notebook/js/mathjaxutils',
     'base/js/keyboard',
     'notebook/js/tooltip',
     'notebook/js/celltoolbarpresets/default',
     'notebook/js/celltoolbarpresets/rawcell',
     'notebook/js/celltoolbarpresets/slideshow',
 ], function (
     IPython, 
     $, 
     utils, 
     dialog, 
     textcell, 
     codecell, 
     session, 
     celltoolbar, 
     marked,
     hljs,
     mathjaxutils,
     keyboard,
     tooltip,
     default_celltoolbar,
     rawcell_celltoolbar,
     slideshow_celltoolbar
     ) {
 
     var Notebook = function (selector, options) {
         // Constructor
         //
         // A notebook contains and manages cells.
         //
         // Parameters:
         //  selector: string
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance
         //          keyboard_manager: KeyboardManager instance
         //          save_widget: SaveWidget instance
         //          config: dictionary
         //          base_url : string
         //          notebook_path : string
         //          notebook_name : string
         this.config = options.config || {};
         this.base_url = options.base_url;
         this.notebook_path = options.notebook_path;
         this.notebook_name = options.notebook_name;
         this.events = options.events;
         this.keyboard_manager = options.keyboard_manager;
         this.save_widget = options.save_widget;
         this.tooltip = new tooltip.Tooltip(this.events);
         this.ws_url = options.ws_url;
         // default_kernel_name is a temporary measure while we implement proper
         // kernel selection and delayed start. Do not rely on it.
         this.default_kernel_name = 'python';
         // TODO: This code smells (and the other `= this` line a couple lines down)
         // We need a better way to deal with circular instance references.
         this.keyboard_manager.notebook = this;
         this.save_widget.notebook = this;
         
         mathjaxutils.init();
 
         if (marked) {
             marked.setOptions({
                 gfm : true,
                 tables: true,
                 langPrefix: "language-",
                 highlight: function(code, lang) {
                     if (!lang) {
                         // no language, no highlight
                         return code;
                     }
                     var highlighted;
                     try {
                         highlighted = hljs.highlight(lang, code, false);
                     } catch(err) {
                         highlighted = hljs.highlightAuto(code);
                     }
                     return highlighted.value;
                 }
             });
         }
 
         this.element = $(selector);
         this.element.scroll();
         this.element.data("notebook", this);
         this.next_prompt_number = 1;
         this.session = null;
         this.kernel = null;
         this.clipboard = null;
         this.undelete_backup = null;
         this.undelete_index = null;
         this.undelete_below = false;
         this.paste_enabled = false;
         // It is important to start out in command mode to match the intial mode
         // of the KeyboardManager.
         this.mode = 'command';
         this.set_dirty(false);
         this.metadata = {};
         this._checkpoint_after_save = false;
         this.last_checkpoint = null;
         this.checkpoints = [];
         this.autosave_interval = 0;
         this.autosave_timer = null;
         // autosave *at most* every two minutes
         this.minimum_autosave_interval = 120000;
         // single worksheet for now
         this.worksheet_metadata = {};
         this.notebook_name_blacklist_re = /[\/\\:]/;
         this.nbformat = 3; // Increment this when changing the nbformat
         this.nbformat_minor = 0; // Increment this when changing the nbformat
         this.codemirror_mode = 'ipython'
         this.style();
         this.create_elements();
         this.bind_events();
         this.save_notebook = function() { // don't allow save until notebook_loaded
             this.save_notebook_error(null, null, "Load failed, save is disabled");
         };
 
         // Trigger cell toolbar registration.
-        default_celltoolbar.register(this, options.events);
-        rawcell_celltoolbar.register(this, options.events);
-        slideshow_celltoolbar.register(this, options.events);
+        default_celltoolbar.register(this);
+        rawcell_celltoolbar.register(this);
+        slideshow_celltoolbar.register(this);
     };
 
     /**
      * Tweak the notebook's CSS style.
      * 
      * @method style
      */
     Notebook.prototype.style = function () {
         $('div#notebook').addClass('border-box-sizing');
     };
 
     /**
      * Create an HTML and CSS representation of the notebook.
      * 
      * @method create_elements
      */
     Notebook.prototype.create_elements = function () {
         var that = this;
         this.element.attr('tabindex','-1');
         this.container = $("<div/>").addClass("container").attr("id", "notebook-container");
         // We add this end_space div to the end of the notebook div to:
         // i) provide a margin between the last cell and the end of the notebook
         // ii) to prevent the div from scrolling up when the last cell is being
         // edited, but is too low on the page, which browsers will do automatically.
         var end_space = $('<div/>').addClass('end_space');
         end_space.dblclick(function (e) {
             var ncells = that.ncells();
             that.insert_cell_below('code',ncells-1);
         });
         this.element.append(this.container);
         this.container.append(end_space);
     };
 
     /**
      * Bind JavaScript events: key presses and custom IPython events.
      * 
      * @method bind_events
      */
     Notebook.prototype.bind_events = function () {
         var that = this;
 
         this.events.on('set_next_input.Notebook', function (event, data) {
             var index = that.find_cell_index(data.cell);
             var new_cell = that.insert_cell_below('code',index);
             new_cell.set_text(data.text);
             that.dirty = true;
         });
 
         this.events.on('set_dirty.Notebook', function (event, data) {
             that.dirty = data.value;
         });
 
         this.events.on('trust_changed.Notebook', function (event, data) {
             that.trusted = data.value;
         });
 
         this.events.on('select.Cell', function (event, data) {
             var index = that.find_cell_index(data.cell);
             that.select(index);
         });
 
         this.events.on('edit_mode.Cell', function (event, data) {
             that.handle_edit_mode(data.cell);
         });
 
         this.events.on('command_mode.Cell', function (event, data) {
             that.handle_command_mode(data.cell);
         });
 
         this.events.on('status_autorestarting.Kernel', function () {
             dialog.modal({
                 notebook: that,
                 keyboard_manager: that.keyboard_manager,
                 title: "Kernel Restarting",
                 body: "The kernel appears to have died. It will restart automatically.",
                 buttons: {
                     OK : {
                         class : "btn-primary"
                     }
                 }
             });
         });
         
         this.events.on('spec_changed.Kernel', function(event, data) {
             that.set_kernelspec_metadata(data);
             if (data.codemirror_mode) {
                 that.set_codemirror_mode(data.codemirror_mode);
             }
         });
 
         var collapse_time = function (time) {
             var app_height = $('#ipython-main-app').height(); // content height
             var splitter_height = $('div#pager_splitter').outerHeight(true);
             var new_height = app_height - splitter_height;
             that.element.animate({height : new_height + 'px'}, time);
         };
 
         this.element.bind('collapse_pager', function (event, extrap) {
             var time = (extrap !== undefined) ? ((extrap.duration !== undefined ) ? extrap.duration : 'fast') : 'fast';
             collapse_time(time);
         });
 
         var expand_time = function (time) {
             var app_height = $('#ipython-main-app').height(); // content height
             var splitter_height = $('div#pager_splitter').outerHeight(true);
             var pager_height = $('div#pager').outerHeight(true);
             var new_height = app_height - pager_height - splitter_height;
             that.element.animate({height : new_height + 'px'}, time);
         };
 
         this.element.bind('expand_pager', function (event, extrap) {
             var time = (extrap !== undefined) ? ((extrap.duration !== undefined ) ? extrap.duration : 'fast') : 'fast';
             expand_time(time);
         });
         
         // Firefox 22 broke $(window).on("beforeunload")
         // I'm not sure why or how.
         window.onbeforeunload = function (e) {
             // TODO: Make killing the kernel configurable.
             var kill_kernel = false;
             if (kill_kernel) {
                 that.session.kill_kernel();
             }
             // if we are autosaving, trigger an autosave on nav-away.
             // still warn, because if we don't the autosave may fail.
             if (that.dirty) {
                 if ( that.autosave_interval ) {
                     // schedule autosave in a timeout
                     // this gives you a chance to forcefully discard changes
                     // by reloading the page if you *really* want to.
                     // the timer doesn't start until you *dismiss* the dialog.
                     setTimeout(function () {
                         if (that.dirty) {
                             that.save_notebook();
                         }
                     }, 1000);
                     return "Autosave in progress, latest changes may be lost.";
                 } else {
                     return "Unsaved changes will be lost.";
                 }
             }
             // Null is the *only* return value that will make the browser not
             // pop up the "don't leave" dialog.
             return null;
         };
     };
 
     /**
      * Set the dirty flag, and trigger the set_dirty.Notebook event
      * 
      * @method set_dirty
      */
     Notebook.prototype.set_dirty = function (value) {
         if (value === undefined) {
             value = true;
         }
         if (this.dirty == value) {
             return;
         }
         this.events.trigger('set_dirty.Notebook', {value: value});
     };
 
     /**
      * Scroll the top of the page to a given cell.
      * 
      * @method scroll_to_cell
      * @param {Number} cell_number An index of the cell to view
      * @param {Number} time Animation time in milliseconds
      * @return {Number} Pixel offset from the top of the container
      */
     Notebook.prototype.scroll_to_cell = function (cell_number, time) {
         var cells = this.get_cells();
         time = time || 0;
         cell_number = Math.min(cells.length-1,cell_number);
         cell_number = Math.max(0             ,cell_number);
         var scroll_value = cells[cell_number].element.position().top-cells[0].element.position().top ;
         this.element.animate({scrollTop:scroll_value}, time);
         return scroll_value;
     };
 
     /**
      * Scroll to the bottom of the page.
      * 
      * @method scroll_to_bottom
      */
     Notebook.prototype.scroll_to_bottom = function () {
         this.element.animate({scrollTop:this.element.get(0).scrollHeight}, 0);
     };
 
     /**
      * Scroll to the top of the page.
      * 
      * @method scroll_to_top
      */
     Notebook.prototype.scroll_to_top = function () {
         this.element.animate({scrollTop:0}, 0);
     };
 
     // Edit Notebook metadata
 
     Notebook.prototype.edit_metadata = function () {
         var that = this;
         dialog.edit_metadata({
             md: this.metadata, 
             callback: function (md) {
                 that.metadata = md;
             }, 
             name: 'Notebook',
             notebook: this,
             keyboard_manager: this.keyboard_manager});
     };
     
     Notebook.prototype.set_kernelspec_metadata = function(ks) {
         var tostore = {};
         $.map(ks, function(value, field) {
             if (field !== 'argv' && field !== 'env') {
                 tostore[field] = value;
             }
         });
         this.metadata.kernelspec = tostore;
     }
 
     // Cell indexing, retrieval, etc.
 
     /**
      * Get all cell elements in the notebook.
      * 
      * @method get_cell_elements
      * @return {jQuery} A selector of all cell elements
      */
     Notebook.prototype.get_cell_elements = function () {
         return this.container.children("div.cell");
     };
 
     /**
      * Get a particular cell element.
      * 
      * @method get_cell_element
      * @param {Number} index An index of a cell to select
      * @return {jQuery} A selector of the given cell.
      */
     Notebook.prototype.get_cell_element = function (index) {
         var result = null;
         var e = this.get_cell_elements().eq(index);
         if (e.length !== 0) {
             result = e;
         }
         return result;
     };
 
     /**
      * Try to get a particular cell by msg_id.
      * 
      * @method get_msg_cell
      * @param {String} msg_id A message UUID
      * @return {Cell} Cell or null if no cell was found.
      */
     Notebook.prototype.get_msg_cell = function (msg_id) {
         return codecell.CodeCell.msg_cells[msg_id] || null;
     };
 
     /**
      * Count the cells in this notebook.
      * 
      * @method ncells
      * @return {Number} The number of cells in this notebook
      */
     Notebook.prototype.ncells = function () {
         return this.get_cell_elements().length;
     };
 
     /**
      * Get all Cell objects in this notebook.
      * 
      * @method get_cells
      * @return {Array} This notebook's Cell objects
      */
     // TODO: we are often calling cells as cells()[i], which we should optimize
     // to cells(i) or a new method.
     Notebook.prototype.get_cells = function () {
         return this.get_cell_elements().toArray().map(function (e) {
             return $(e).data("cell");
         });
     };
 
     /**
      * Get a Cell object from this notebook.
      * 
      * @method get_cell
      * @param {Number} index An index of a cell to retrieve
      * @return {Cell} A particular cell
      */
     Notebook.prototype.get_cell = function (index) {
         var result = null;
         var ce = this.get_cell_element(index);
         if (ce !== null) {
             result = ce.data('cell');
         }
         return result;
     };
 
     /**
      * Get the cell below a given cell.
      * 
      * @method get_next_cell
      * @param {Cell} cell The provided cell
      * @return {Cell} The next cell
      */
     Notebook.prototype.get_next_cell = function (cell) {
         var result = null;
         var index = this.find_cell_index(cell);
         if (this.is_valid_cell_index(index+1)) {
             result = this.get_cell(index+1);
         }
         return result;
     };
 
     /**
      * Get the cell above a given cell.
      * 
      * @method get_prev_cell
      * @param {Cell} cell The provided cell
      * @return {Cell} The previous cell
      */
     Notebook.prototype.get_prev_cell = function (cell) {
         // TODO: off-by-one
         // nb.get_prev_cell(nb.get_cell(1)) is null
         var result = null;
         var index = this.find_cell_index(cell);
         if (index !== null && index > 1) {
             result = this.get_cell(index-1);
         }
         return result;
     };
     
     /**
      * Get the numeric index of a given cell.
      * 
      * @method find_cell_index
      * @param {Cell} cell The provided cell
      * @return {Number} The cell's numeric index
      */
     Notebook.prototype.find_cell_index = function (cell) {
         var result = null;
         this.get_cell_elements().filter(function (index) {
             if ($(this).data("cell") === cell) {
                 result = index;
             }
         });
         return result;
     };
 
     /**
      * Get a given index , or the selected index if none is provided.
      * 
      * @method index_or_selected
      * @param {Number} index A cell's index
      * @return {Number} The given index, or selected index if none is provided.
      */
     Notebook.prototype.index_or_selected = function (index) {
         var i;
         if (index === undefined || index === null) {
             i = this.get_selected_index();
             if (i === null) {
                 i = 0;
             }
         } else {
             i = index;
         }
         return i;
     };
 
     /**
      * Get the currently selected cell.
      * @method get_selected_cell
      * @return {Cell} The selected cell
      */
     Notebook.prototype.get_selected_cell = function () {
         var index = this.get_selected_index();
         return this.get_cell(index);
     };
 
     /**
      * Check whether a cell index is valid.
      * 
      * @method is_valid_cell_index
      * @param {Number} index A cell index
      * @return True if the index is valid, false otherwise
      */
     Notebook.prototype.is_valid_cell_index = function (index) {
         if (index !== null && index >= 0 && index < this.ncells()) {
             return true;
         } else {
             return false;
         }
     };
 
     /**
      * Get the index of the currently selected cell.
      
      * @method get_selected_index
      * @return {Number} The selected cell's numeric index
      */
     Notebook.prototype.get_selected_index = function () {
         var result = null;
         this.get_cell_elements().filter(function (index) {
             if ($(this).data("cell").selected === true) {
                 result = index;
             }
         });
         return result;
     };
 
 
     // Cell selection.
 
     /**
      * Programmatically select a cell.
      * 
      * @method select
      * @param {Number} index A cell's index
      * @return {Notebook} This notebook
      */
     Notebook.prototype.select = function (index) {
         if (this.is_valid_cell_index(index)) {
             var sindex = this.get_selected_index();
             if (sindex !== null && index !== sindex) {
                 // If we are about to select a different cell, make sure we are
                 // first in command mode.
                 if (this.mode !== 'command') {
                     this.command_mode();
                 }
                 this.get_cell(sindex).unselect();
             }
             var cell = this.get_cell(index);
             cell.select();
             if (cell.cell_type === 'heading') {
                 this.events.trigger('selected_cell_type_changed.Notebook',
                     {'cell_type':cell.cell_type,level:cell.level}
                 );
             } else {
                 this.events.trigger('selected_cell_type_changed.Notebook',
                     {'cell_type':cell.cell_type}
                 );
             }
         }
         return this;
     };
 
     /**
      * Programmatically select the next cell.
      *
      * @method select_next
      * @return {Notebook} This notebook
      */
     Notebook.prototype.select_next = function () {
         var index = this.get_selected_index();
         this.select(index+1);
         return this;
     };
 
     /**
      * Programmatically select the previous cell.
      *
      * @method select_prev
      * @return {Notebook} This notebook
      */
     Notebook.prototype.select_prev = function () {
         var index = this.get_selected_index();
         this.select(index-1);
         return this;
     };
 
 
     // Edit/Command mode
 
     /**
      * Gets the index of the cell that is in edit mode.
      *
      * @method get_edit_index
      *
      * @return index {int}
      **/
     Notebook.prototype.get_edit_index = function () {
         var result = null;
         this.get_cell_elements().filter(function (index) {
             if ($(this).data("cell").mode === 'edit') {
                 result = index;
             }
         });
         return result;
     };
 
     /**
      * Handle when a a cell blurs and the notebook should enter command mode.
      *
      * @method handle_command_mode
      * @param [cell] {Cell} Cell to enter command mode on.
      **/
     Notebook.prototype.handle_command_mode = function (cell) {
         if (this.mode !== 'command') {
             cell.command_mode();
             this.mode = 'command';
             this.events.trigger('command_mode.Notebook');
             this.keyboard_manager.command_mode();
         }
     };
 
     /**
      * Make the notebook enter command mode.
      *
      * @method command_mode
      **/
     Notebook.prototype.command_mode = function () {
         var cell = this.get_cell(this.get_edit_index());
         if (cell && this.mode !== 'command') {
             // We don't call cell.command_mode, but rather call cell.focus_cell()
             // which will blur and CM editor and trigger the call to
             // handle_command_mode.
             cell.focus_cell();
         }
     };
 
     /**
      * Handle when a cell fires it's edit_mode event.
      *
      * @method handle_edit_mode
      * @param [cell] {Cell} Cell to enter edit mode on.
      **/
     Notebook.prototype.handle_edit_mode = function (cell) {
         if (cell && this.mode !== 'edit') {
             cell.edit_mode();
             this.mode = 'edit';
             this.events.trigger('edit_mode.Notebook');
             this.keyboard_manager.edit_mode();
         }
     };
 
     /**
      * Make a cell enter edit mode.
      *
      * @method edit_mode
      **/
     Notebook.prototype.edit_mode = function () {
         var cell = this.get_selected_cell();
         if (cell && this.mode !== 'edit') {
             cell.unrender();
             cell.focus_editor();
         }
     };
 
     /**
      * Focus the currently selected cell.
      *
      * @method focus_cell
      **/
     Notebook.prototype.focus_cell = function () {
         var cell = this.get_selected_cell();
         if (cell === null) {return;}  // No cell is selected
         cell.focus_cell();
     };
 
     // Cell movement
 
     /**
      * Move given (or selected) cell up and select it.
      * 
      * @method move_cell_up
      * @param [index] {integer} cell index
      * @return {Notebook} This notebook
      **/
     Notebook.prototype.move_cell_up = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i) && i > 0) {
             var pivot = this.get_cell_element(i-1);
             var tomove = this.get_cell_element(i);
             if (pivot !== null && tomove !== null) {
                 tomove.detach();
                 pivot.before(tomove);
                 this.select(i-1);
                 var cell = this.get_selected_cell();
                 cell.focus_cell();
             }
             this.set_dirty(true);
         }
         return this;
     };
 
 
     /**
      * Move given (or selected) cell down and select it
      * 
      * @method move_cell_down
      * @param [index] {integer} cell index
      * @return {Notebook} This notebook
      **/
     Notebook.prototype.move_cell_down = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i) && this.is_valid_cell_index(i+1)) {
             var pivot = this.get_cell_element(i+1);
             var tomove = this.get_cell_element(i);
             if (pivot !== null && tomove !== null) {
                 tomove.detach();
                 pivot.after(tomove);
                 this.select(i+1);
                 var cell = this.get_selected_cell();
                 cell.focus_cell();
             }
         }
         this.set_dirty();
         return this;
     };
 
 
     // Insertion, deletion.
 
     /**
      * Delete a cell from the notebook.
      * 
      * @method delete_cell
      * @param [index] A cell's numeric index
      * @return {Notebook} This notebook
      */
     Notebook.prototype.delete_cell = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_selected_cell();
         this.undelete_backup = cell.toJSON();
         $('#undelete_cell').removeClass('disabled');
         if (this.is_valid_cell_index(i)) {
             var old_ncells = this.ncells();
             var ce = this.get_cell_element(i);
             ce.remove();
             if (i === 0) {
                 // Always make sure we have at least one cell.
                 if (old_ncells === 1) {
                     this.insert_cell_below('code');
                 }
                 this.select(0);
                 this.undelete_index = 0;
                 this.undelete_below = false;
             } else if (i === old_ncells-1 && i !== 0) {
                 this.select(i-1);
                 this.undelete_index = i - 1;
                 this.undelete_below = true;
             } else {
                 this.select(i);
                 this.undelete_index = i;
                 this.undelete_below = false;
             }
             this.events.trigger('delete.Cell', {'cell': cell, 'index': i});
             this.set_dirty(true);
         }
         return this;
     };
 
     /**
      * Restore the most recently deleted cell.
      * 
      * @method undelete
      */
     Notebook.prototype.undelete_cell = function() {
         if (this.undelete_backup !== null && this.undelete_index !== null) {
             var current_index = this.get_selected_index();
             if (this.undelete_index < current_index) {
                 current_index = current_index + 1;
             }
             if (this.undelete_index >= this.ncells()) {
                 this.select(this.ncells() - 1);
             }
             else {
                 this.select(this.undelete_index);
             }
             var cell_data = this.undelete_backup;
             var new_cell = null;
             if (this.undelete_below) {
                 new_cell = this.insert_cell_below(cell_data.cell_type);
             } else {
                 new_cell = this.insert_cell_above(cell_data.cell_type);
             }
             new_cell.fromJSON(cell_data);
             if (this.undelete_below) {
                 this.select(current_index+1);
             } else {
                 this.select(current_index);
             }
             this.undelete_backup = null;
             this.undelete_index = null;
         }
         $('#undelete_cell').addClass('disabled');
     };
 
     /**
      * Insert a cell so that after insertion the cell is at given index.
      *
      * If cell type is not provided, it will default to the type of the
      * currently active cell.
      *
      * Similar to insert_above, but index parameter is mandatory
      *
      * Index will be brought back into the accessible range [0,n]
      *
      * @method insert_cell_at_index
      * @param [type] {string} in ['code','markdown','heading'], defaults to 'code'
      * @param [index] {int} a valid index where to insert cell
      *
      * @return cell {cell|null} created cell or null
      **/
     Notebook.prototype.insert_cell_at_index = function(type, index){
 
         var ncells = this.ncells();
         index = Math.min(index,ncells);
         index = Math.max(index,0);
         var cell = null;
         type = type || this.get_selected_cell().cell_type;
 
         if (ncells === 0 || this.is_valid_cell_index(index) || index === ncells) {
             var cell_options = {
                 events: this.events, 
                 config: this.config, 
                 keyboard_manager: this.keyboard_manager, 
                 notebook: this,
                 tooltip: this.tooltip,
             };
             if (type === 'code') {
                 cell = new codecell.CodeCell(this.kernel, cell_options);
                 cell.set_input_prompt();
             } else if (type === 'markdown') {
                 cell = new textcell.MarkdownCell(cell_options);
             } else if (type === 'raw') {
                 cell = new textcell.RawCell(cell_options);
             } else if (type === 'heading') {
                 cell = new textcell.HeadingCell(cell_options);
             }
 
             if(this._insert_element_at_index(cell.element,index)) {
                 cell.render();
                 this.events.trigger('create.Cell', {'cell': cell, 'index': index});
                 cell.refresh();
                 // We used to select the cell after we refresh it, but there
                 // are now cases were this method is called where select is
                 // not appropriate. The selection logic should be handled by the
                 // caller of the the top level insert_cell methods.
                 this.set_dirty(true);
             }
         }
         return cell;
 
     };
 
     /**
      * Insert an element at given cell index.
      *
      * @method _insert_element_at_index
      * @param element {dom element} a cell element
      * @param [index] {int} a valid index where to inser cell
      * @private
      *
      * return true if everything whent fine.
      **/
     Notebook.prototype._insert_element_at_index = function(element, index){
         if (element === undefined){
             return false;
         }
 
         var ncells = this.ncells();
 
         if (ncells === 0) {
             // special case append if empty
             this.element.find('div.end_space').before(element);
         } else if ( ncells === index ) {
             // special case append it the end, but not empty
             this.get_cell_element(index-1).after(element);
         } else if (this.is_valid_cell_index(index)) {
             // otherwise always somewhere to append to
             this.get_cell_element(index).before(element);
         } else {
             return false;
         }
 
         if (this.undelete_index !== null && index <= this.undelete_index) {
             this.undelete_index = this.undelete_index + 1;
             this.set_dirty(true);
         }
         return true;
     };
 
     /**
      * Insert a cell of given type above given index, or at top
      * of notebook if index smaller than 0.
      *
      * default index value is the one of currently selected cell
      *
      * @method insert_cell_above
      * @param [type] {string} cell type
      * @param [index] {integer}
      *
      * @return handle to created cell or null
      **/
     Notebook.prototype.insert_cell_above = function (type, index) {
         index = this.index_or_selected(index);
         return this.insert_cell_at_index(type, index);
     };
 
     /**
      * Insert a cell of given type below given index, or at bottom
      * of notebook if index greater than number of cells
      *
      * default index value is the one of currently selected cell
      *
      * @method insert_cell_below
      * @param [type] {string} cell type
      * @param [index] {integer}
      *
      * @return handle to created cell or null
      *
      **/
     Notebook.prototype.insert_cell_below = function (type, index) {
         index = this.index_or_selected(index);
         return this.insert_cell_at_index(type, index+1);
     };
 
 
     /**
      * Insert cell at end of notebook
      *
      * @method insert_cell_at_bottom
      * @param {String} type cell type
      *
      * @return the added cell; or null
      **/
     Notebook.prototype.insert_cell_at_bottom = function (type){
         var len = this.ncells();
         return this.insert_cell_below(type,len-1);
     };
 
     /**
      * Turn a cell into a code cell.
      * 
      * @method to_code
      * @param {Number} [index] A cell's index
      */
     Notebook.prototype.to_code = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
             var source_element = this.get_cell_element(i);
             var source_cell = source_element.data("cell");
             if (!(source_cell instanceof codecell.CodeCell)) {
                 var target_cell = this.insert_cell_below('code',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
                 source_element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
                 this.set_dirty(true);
             }
         }
     };
 
     /**
      * Turn a cell into a Markdown cell.
      * 
      * @method to_markdown
      * @param {Number} [index] A cell's index
      */
     Notebook.prototype.to_markdown = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
             var source_element = this.get_cell_element(i);
             var source_cell = source_element.data("cell");
             if (!(source_cell instanceof textcell.MarkdownCell)) {
                 var target_cell = this.insert_cell_below('markdown',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
                 // We must show the editor before setting its contents
                 target_cell.unrender();
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
                 source_element.remove();
                 this.select(i);
                 if ((source_cell instanceof textcell.TextCell) && source_cell.rendered) {
                     target_cell.render();
                 }
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
                 this.set_dirty(true);
             }
         }
     };
 
     /**
      * Turn a cell into a raw text cell.
      * 
      * @method to_raw
      * @param {Number} [index] A cell's index
      */
     Notebook.prototype.to_raw = function (index) {
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
             var source_element = this.get_cell_element(i);
             var source_cell = source_element.data("cell");
             var target_cell = null;
             if (!(source_cell instanceof textcell.RawCell)) {
                 target_cell = this.insert_cell_below('raw',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
                 // We must show the editor before setting its contents
                 target_cell.unrender();
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
                 source_element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
                 this.set_dirty(true);
             }
         }
     };
 
     /**
      * Turn a cell into a heading cell.
      * 
      * @method to_heading
      * @param {Number} [index] A cell's index
      * @param {Number} [level] A heading level (e.g., 1 becomes &lt;h1&gt;)
      */
     Notebook.prototype.to_heading = function (index, level) {
         level = level || 1;
         var i = this.index_or_selected(index);
         if (this.is_valid_cell_index(i)) {
             var source_element = this.get_cell_element(i);
             var source_cell = source_element.data("cell");
             var target_cell = null;
             if (source_cell instanceof textcell.HeadingCell) {
                 source_cell.set_level(level);
             } else {
                 target_cell = this.insert_cell_below('heading',i);
                 var text = source_cell.get_text();
                 if (text === source_cell.placeholder) {
                     text = '';
                 }
                 // We must show the editor before setting its contents
                 target_cell.set_level(level);
                 target_cell.unrender();
                 target_cell.set_text(text);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 target_cell.code_mirror.clearHistory();
                 source_element.remove();
                 this.select(i);
                 var cursor = source_cell.code_mirror.getCursor();
                 target_cell.code_mirror.setCursor(cursor);
                 if ((source_cell instanceof textcell.TextCell) && source_cell.rendered) {
                     target_cell.render();
                 }
             }
             this.set_dirty(true);
             this.events.trigger('selected_cell_type_changed.Notebook',
                 {'cell_type':'heading',level:level}
             );
         }
     };
 
 
     // Cut/Copy/Paste
 
     /**
      * Enable UI elements for pasting cells.
      * 
      * @method enable_paste
      */
     Notebook.prototype.enable_paste = function () {
         var that = this;
         if (!this.paste_enabled) {
             $('#paste_cell_replace').removeClass('disabled')
                 .on('click', function () {that.paste_cell_replace();});
             $('#paste_cell_above').removeClass('disabled')
                 .on('click', function () {that.paste_cell_above();});
             $('#paste_cell_below').removeClass('disabled')
                 .on('click', function () {that.paste_cell_below();});
             this.paste_enabled = true;
         }
     };
 
     /**
      * Disable UI elements for pasting cells.
      * 
      * @method disable_paste
      */
     Notebook.prototype.disable_paste = function () {
         if (this.paste_enabled) {
             $('#paste_cell_replace').addClass('disabled').off('click');
             $('#paste_cell_above').addClass('disabled').off('click');
             $('#paste_cell_below').addClass('disabled').off('click');
             this.paste_enabled = false;
         }
     };
 
     /**
      * Cut a cell.
      * 
      * @method cut_cell
      */
     Notebook.prototype.cut_cell = function () {
         this.copy_cell();
         this.delete_cell();
     };
 
     /**
      * Copy a cell.
      * 
      * @method copy_cell
      */
     Notebook.prototype.copy_cell = function () {
         var cell = this.get_selected_cell();
         this.clipboard = cell.toJSON();
         this.enable_paste();
     };
 
     /**
      * Replace the selected cell with a cell in the clipboard.
      * 
      * @method paste_cell_replace
      */
     Notebook.prototype.paste_cell_replace = function () {
         if (this.clipboard !== null && this.paste_enabled) {
             var cell_data = this.clipboard;
             var new_cell = this.insert_cell_above(cell_data.cell_type);
             new_cell.fromJSON(cell_data);
             var old_cell = this.get_next_cell(new_cell);
             this.delete_cell(this.find_cell_index(old_cell));
             this.select(this.find_cell_index(new_cell));
         }
     };
 
     /**
      * Paste a cell from the clipboard above the selected cell.
      * 
      * @method paste_cell_above
      */
     Notebook.prototype.paste_cell_above = function () {
         if (this.clipboard !== null && this.paste_enabled) {
             var cell_data = this.clipboard;
             var new_cell = this.insert_cell_above(cell_data.cell_type);
             new_cell.fromJSON(cell_data);
             new_cell.focus_cell();
         }
     };
 
     /**
      * Paste a cell from the clipboard below the selected cell.
      * 
      * @method paste_cell_below
      */
     Notebook.prototype.paste_cell_below = function () {
         if (this.clipboard !== null && this.paste_enabled) {
             var cell_data = this.clipboard;
             var new_cell = this.insert_cell_below(cell_data.cell_type);
             new_cell.fromJSON(cell_data);
             new_cell.focus_cell();
         }
     };
 
     // Split/merge
 
     /**
      * Split the selected cell into two, at the cursor.
      * 
      * @method split_cell
      */
     Notebook.prototype.split_cell = function () {
         var mdc = textcell.MarkdownCell;
         var rc = textcell.RawCell;
         var cell = this.get_selected_cell();
         if (cell.is_splittable()) {
             var texta = cell.get_pre_cursor();
             var textb = cell.get_post_cursor();
             cell.set_text(textb);
             var new_cell = this.insert_cell_above(cell.cell_type);
             // Unrender the new cell so we can call set_text.
             new_cell.unrender();
             new_cell.set_text(texta);
         }
     };
 
     /**
      * Combine the selected cell into the cell above it.
      * 
      * @method merge_cell_above
      */
     Notebook.prototype.merge_cell_above = function () {
         var mdc = textcell.MarkdownCell;
         var rc = textcell.RawCell;
         var index = this.get_selected_index();
         var cell = this.get_cell(index);
         var render = cell.rendered;
         if (!cell.is_mergeable()) {
             return;
         }
         if (index > 0) {
             var upper_cell = this.get_cell(index-1);
             if (!upper_cell.is_mergeable()) {
                 return;
             }
             var upper_text = upper_cell.get_text();
             var text = cell.get_text();
             if (cell instanceof codecell.CodeCell) {
                 cell.set_text(upper_text+'\n'+text);
             } else {
                 cell.unrender(); // Must unrender before we set_text.
                 cell.set_text(upper_text+'\n\n'+text);
                 if (render) {
                     // The rendered state of the final cell should match
                     // that of the original selected cell;
                     cell.render();
                 }
             }
             this.delete_cell(index-1);
             this.select(this.find_cell_index(cell));
         }
     };
 
     /**
      * Combine the selected cell into the cell below it.
      * 
      * @method merge_cell_below
      */
     Notebook.prototype.merge_cell_below = function () {
         var mdc = textcell.MarkdownCell;
         var rc = textcell.RawCell;
         var index = this.get_selected_index();
         var cell = this.get_cell(index);
         var render = cell.rendered;
         if (!cell.is_mergeable()) {
             return;
         }
         if (index < this.ncells()-1) {
             var lower_cell = this.get_cell(index+1);
             if (!lower_cell.is_mergeable()) {
                 return;
             }
             var lower_text = lower_cell.get_text();
             var text = cell.get_text();
             if (cell instanceof codecell.CodeCell) {
                 cell.set_text(text+'\n'+lower_text);
             } else {
                 cell.unrender(); // Must unrender before we set_text.
                 cell.set_text(text+'\n\n'+lower_text);
                 if (render) {
                     // The rendered state of the final cell should match
                     // that of the original selected cell;
                     cell.render();
                 }
             }
             this.delete_cell(index+1);
             this.select(this.find_cell_index(cell));
         }
     };
 
 
     // Cell collapsing and output clearing
 
     /**
      * Hide a cell's output.
      * 
      * @method collapse_output
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.collapse_output = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.collapse_output();
             this.set_dirty(true);
         }
     };
 
     /**
      * Hide each code cell's output area.
      * 
      * @method collapse_all_output
      */
     Notebook.prototype.collapse_all_output = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.collapse_output();
             }
         });
         // this should not be set if the `collapse` key is removed from nbformat
         this.set_dirty(true);
     };
 
     /**
      * Show a cell's output.
      * 
      * @method expand_output
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.expand_output = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.expand_output();
             this.set_dirty(true);
         }
     };
 
     /**
      * Expand each code cell's output area, and remove scrollbars.
      * 
      * @method expand_all_output
      */
     Notebook.prototype.expand_all_output = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.expand_output();
             }
         });
         // this should not be set if the `collapse` key is removed from nbformat
         this.set_dirty(true);
     };
 
     /**
      * Clear the selected CodeCell's output area.
      * 
      * @method clear_output
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.clear_output = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.clear_output();
             this.set_dirty(true);
         }
     };
 
     /**
      * Clear each code cell's output area.
      * 
      * @method clear_all_output
      */
     Notebook.prototype.clear_all_output = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.clear_output();
             }
         });
         this.set_dirty(true);
     };
 
     /**
      * Scroll the selected CodeCell's output area.
      * 
      * @method scroll_output
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.scroll_output = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.scroll_output();
             this.set_dirty(true);
         }
     };
 
     /**
      * Expand each code cell's output area, and add a scrollbar for long output.
      * 
      * @method scroll_all_output
      */
     Notebook.prototype.scroll_all_output = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.scroll_output();
             }
         });
         // this should not be set if the `collapse` key is removed from nbformat
         this.set_dirty(true);
     };
 
     /** Toggle whether a cell's output is collapsed or expanded.
      * 
      * @method toggle_output
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.toggle_output = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.toggle_output();
             this.set_dirty(true);
         }
     };
 
     /**
      * Hide/show the output of all cells.
      * 
      * @method toggle_all_output
      */
     Notebook.prototype.toggle_all_output = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.toggle_output();
             }
         });
         // this should not be set if the `collapse` key is removed from nbformat
         this.set_dirty(true);
     };
 
     /**
      * Toggle a scrollbar for long cell outputs.
      * 
      * @method toggle_output_scroll
      * @param {Number} index A cell's numeric index
      */
     Notebook.prototype.toggle_output_scroll = function (index) {
         var i = this.index_or_selected(index);
         var cell = this.get_cell(i);
         if (cell !== null && (cell instanceof codecell.CodeCell)) {
             cell.toggle_output_scroll();
             this.set_dirty(true);
         }
     };
 
     /**
      * Toggle the scrolling of long output on all cells.
      * 
      * @method toggle_all_output_scrolling
      */
     Notebook.prototype.toggle_all_output_scroll = function () {
         $.map(this.get_cells(), function (cell, i) {
             if (cell instanceof codecell.CodeCell) {
                 cell.toggle_output_scroll();
             }
         });
         // this should not be set if the `collapse` key is removed from nbformat
         this.set_dirty(true);
     };
 
     // Other cell functions: line numbers, ...
 
     /**
      * Toggle line numbers in the selected cell's input area.
      * 
      * @method cell_toggle_line_numbers
      */
     Notebook.prototype.cell_toggle_line_numbers = function() {
         this.get_selected_cell().toggle_line_numbers();
     };
     
     /**
      * Set the codemirror mode for all code cells, including the default for
      * new code cells.
      * 
      * @method set_codemirror_mode
      */
     Notebook.prototype.set_codemirror_mode = function(newmode){
         if (newmode === this.codemirror_mode) {
             return;
         }
         this.codemirror_mode = newmode;
         codecell.CodeCell.options_default.cm_config.mode = newmode;
         modename = newmode.name || newmode
 
         that = this;
         CodeMirror.requireMode(modename, function(){
             $.map(that.get_cells(), function(cell, i) {
                 if (cell.cell_type === 'code'){
                     cell.code_mirror.setOption('mode', newmode);
                     // This is currently redundant, because cm_config ends up as
                     // codemirror's own .options object, but I don't want to
                     // rely on that.
                     cell.cm_config.mode = newmode;
                 }
             });
         })
     };
 
     // Session related things
 
     /**
      * Start a new session and set it on each code cell.
      * 
      * @method start_session
      */
     Notebook.prototype.start_session = function (kernel_name) {
         if (kernel_name === undefined) {
             kernel_name = this.default_kernel_name;
         }
         this.session = new session.Session({
             base_url: this.base_url,
             ws_url: this.ws_url,
             notebook_path: this.notebook_path,
             notebook_name: this.notebook_name,
             // For now, create all sessions with the 'python' kernel, which is the
             // default. Later, the user will be able to select kernels. This is
             // overridden if KernelManager.kernel_cmd is specified for the server.
             kernel_name: kernel_name,
             notebook: this});
 
         this.session.start($.proxy(this._session_started, this));
     };
 
 
     /**
      * Once a session is started, link the code cells to the kernel and pass the 
      * comm manager to the widget manager
      *
      */
     Notebook.prototype._session_started = function(){
         this.kernel = this.session.kernel;
         var ncells = this.ncells();
         for (var i=0; i<ncells; i++) {
             var cell = this.get_cell(i);
             if (cell instanceof codecell.CodeCell) {
                 cell.set_kernel(this.session.kernel);
             }
         }
     };
     
     /**
      * Prompt the user to restart the IPython kernel.
      * 
      * @method restart_kernel
      */
     Notebook.prototype.restart_kernel = function () {
         var that = this;
         dialog.modal({
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title : "Restart kernel or continue running?",
             body : $("<p/>").text(
                 'Do you want to restart the current kernel?  You will lose all variables defined in it.'
             ),
             buttons : {
                 "Continue running" : {},
                 "Restart" : {
                     "class" : "btn-danger",
                     "click" : function() {
                         that.session.restart_kernel();
                     }
                 }
             }
         });
     };
     
     /**
      * Execute or render cell outputs and go into command mode.
      * 
      * @method execute_cell
      */
     Notebook.prototype.execute_cell = function () {
         // mode = shift, ctrl, alt
         var cell = this.get_selected_cell();
         var cell_index = this.find_cell_index(cell);
         
         cell.execute();
         this.command_mode();
         this.set_dirty(true);
     };
 
     /**
      * Execute or render cell outputs and insert a new cell below.
      * 
      * @method execute_cell_and_insert_below
      */
     Notebook.prototype.execute_cell_and_insert_below = function () {
         var cell = this.get_selected_cell();
         var cell_index = this.find_cell_index(cell);
         
         cell.execute();
 
         // If we are at the end always insert a new cell and return
         if (cell_index === (this.ncells()-1)) {
             this.command_mode();
             this.insert_cell_below();
             this.select(cell_index+1);
             this.edit_mode();
             this.scroll_to_bottom();
             this.set_dirty(true);
             return;
         }
 
         this.command_mode();
         this.insert_cell_below();
         this.select(cell_index+1);
         this.edit_mode();
         this.set_dirty(true);
     };
 
     /**
      * Execute or render cell outputs and select the next cell.
      * 
      * @method execute_cell_and_select_below
      */
     Notebook.prototype.execute_cell_and_select_below = function () {
 
         var cell = this.get_selected_cell();
         var cell_index = this.find_cell_index(cell);
         
         cell.execute();
 
         // If we are at the end always insert a new cell and return
         if (cell_index === (this.ncells()-1)) {
             this.command_mode();
             this.insert_cell_below();
             this.select(cell_index+1);
             this.edit_mode();
             this.scroll_to_bottom();
             this.set_dirty(true);
             return;
         }
 
         this.command_mode();
         this.select(cell_index+1);
         this.focus_cell();
         this.set_dirty(true);
     };
 
     /**
      * Execute all cells below the selected cell.
      * 
      * @method execute_cells_below
      */
     Notebook.prototype.execute_cells_below = function () {
         this.execute_cell_range(this.get_selected_index(), this.ncells());
         this.scroll_to_bottom();
     };
 
     /**
      * Execute all cells above the selected cell.
      * 
      * @method execute_cells_above
      */
     Notebook.prototype.execute_cells_above = function () {
         this.execute_cell_range(0, this.get_selected_index());
     };
 
     /**
      * Execute all cells.
      * 
      * @method execute_all_cells
      */
     Notebook.prototype.execute_all_cells = function () {
         this.execute_cell_range(0, this.ncells());
         this.scroll_to_bottom();
     };
 
     /**
      * Execute a contiguous range of cells.
      * 
      * @method execute_cell_range
      * @param {Number} start Index of the first cell to execute (inclusive)
      * @param {Number} end Index of the last cell to execute (exclusive)
      */
     Notebook.prototype.execute_cell_range = function (start, end) {
         this.command_mode();
         for (var i=start; i<end; i++) {
             this.select(i);
             this.execute_cell();
         }
     };
 
     // Persistance and loading
 
     /**
      * Getter method for this notebook's name.
      * 
      * @method get_notebook_name
      * @return {String} This notebook's name (excluding file extension)
      */
     Notebook.prototype.get_notebook_name = function () {
         var nbname = this.notebook_name.substring(0,this.notebook_name.length-6);
         return nbname;
     };
 
     /**
      * Setter method for this notebook's name.
      *
      * @method set_notebook_name
      * @param {String} name A new name for this notebook
      */
     Notebook.prototype.set_notebook_name = function (name) {
         this.notebook_name = name;
     };
 
     /**
      * Check that a notebook's name is valid.
      * 
      * @method test_notebook_name
      * @param {String} nbname A name for this notebook
      * @return {Boolean} True if the name is valid, false if invalid
      */
     Notebook.prototype.test_notebook_name = function (nbname) {
         nbname = nbname || '';
         if (nbname.length>0 && !this.notebook_name_blacklist_re.test(nbname)) {
             return true;
         } else {
             return false;
         }
     };
 
     /**
      * Load a notebook from JSON (.ipynb).
      * 
      * This currently handles one worksheet: others are deleted.
      * 
      * @method fromJSON
      * @param {Object} data JSON representation of a notebook
      */
     Notebook.prototype.fromJSON = function (data) {
         var content = data.content;
         var ncells = this.ncells();
         var i;
         for (i=0; i<ncells; i++) {
             // Always delete cell 0 as they get renumbered as they are deleted.
             this.delete_cell(0);
         }
         // Save the metadata and name.
         this.metadata = content.metadata;
         this.notebook_name = data.name;
         var trusted = true;
         
         // Trigger an event changing the kernel spec - this will set the default
         // codemirror mode
         if (this.metadata.kernelspec !== undefined) {
             this.events.trigger('spec_changed.Kernel', this.metadata.kernelspec);
         }
         
         // Only handle 1 worksheet for now.
         var worksheet = content.worksheets[0];
         if (worksheet !== undefined) {
             if (worksheet.metadata) {
                 this.worksheet_metadata = worksheet.metadata;
             }
             var new_cells = worksheet.cells;
             ncells = new_cells.length;
             var cell_data = null;
             var new_cell = null;
             for (i=0; i<ncells; i++) {
                 cell_data = new_cells[i];
                 // VERSIONHACK: plaintext -> raw
                 // handle never-released plaintext name for raw cells
                 if (cell_data.cell_type === 'plaintext'){
                     cell_data.cell_type = 'raw';
                 }
 
                 new_cell = this.insert_cell_at_index(cell_data.cell_type, i);
                 new_cell.fromJSON(cell_data);
                 if (new_cell.cell_type == 'code' && !new_cell.output_area.trusted) {
                     trusted = false;
                 }
             }
         }
         if (trusted != this.trusted) {
             this.trusted = trusted;
             this.events.trigger("trust_changed.Notebook", trusted);
         }
         if (content.worksheets.length > 1) {
             dialog.modal({
                 notebook: this,
                 keyboard_manager: this.keyboard_manager,
                 title : "Multiple worksheets",
                 body : "This notebook has " + data.worksheets.length + " worksheets, " +
                     "but this version of IPython can only handle the first.  " +
                     "If you save this notebook, worksheets after the first will be lost.",
                 buttons : {
                     OK : {
                         class : "btn-danger"
                     }
                 }
             });
         }
     };
 
     /**
      * Dump this notebook into a JSON-friendly object.
      * 
      * @method toJSON
      * @return {Object} A JSON-friendly representation of this notebook.
      */
     Notebook.prototype.toJSON = function () {
         var cells = this.get_cells();
         var ncells = cells.length;
         var cell_array = new Array(ncells);
         var trusted = true;
         for (var i=0; i<ncells; i++) {
             var cell = cells[i];
             if (cell.cell_type == 'code' && !cell.output_area.trusted) {
                 trusted = false;
             }
             cell_array[i] = cell.toJSON();
         }
         var data = {
             // Only handle 1 worksheet for now.
             worksheets : [{
                 cells: cell_array,
                 metadata: this.worksheet_metadata
             }],
             metadata : this.metadata
         };
         if (trusted != this.trusted) {
             this.trusted = trusted;
             this.events.trigger("trust_changed.Notebook", trusted);
         }
         return data;
     };
 
     /**
      * Start an autosave timer, for periodically saving the notebook.
      * 
      * @method set_autosave_interval
      * @param {Integer} interval the autosave interval in milliseconds
      */
     Notebook.prototype.set_autosave_interval = function (interval) {
         var that = this;
         // clear previous interval, so we don't get simultaneous timers
         if (this.autosave_timer) {
             clearInterval(this.autosave_timer);
         }
         
         this.autosave_interval = this.minimum_autosave_interval = interval;
         if (interval) {
             this.autosave_timer = setInterval(function() {
                 if (that.dirty) {
                     that.save_notebook();
                 }
             }, interval);
             this.events.trigger("autosave_enabled.Notebook", interval);
         } else {
             this.autosave_timer = null;
             this.events.trigger("autosave_disabled.Notebook");
         }
     };
     
     /**
      * Save this notebook on the server. This becomes a notebook instance's
      * .save_notebook method *after* the entire notebook has been loaded.
      * 
      * @method save_notebook
      */
     Notebook.prototype.save_notebook = function (extra_settings) {
         // Create a JSON model to be sent to the server.
         var model = {};
         model.name = this.notebook_name;
         model.path = this.notebook_path;
         model.content = this.toJSON();
         model.content.nbformat = this.nbformat;
         model.content.nbformat_minor = this.nbformat_minor;
         // time the ajax call for autosave tuning purposes.
         var start =  new Date().getTime();
         // We do the call with settings so we can set cache to false.
         var settings = {
             processData : false,
             cache : false,
             type : "PUT",
             data : JSON.stringify(model),
             headers : {'Content-Type': 'application/json'},
             success : $.proxy(this.save_notebook_success, this, start),
             error : $.proxy(this.save_notebook_error, this)
         };
         if (extra_settings) {
             for (var key in extra_settings) {
                 settings[key] = extra_settings[key];
             }
         }
         this.events.trigger('notebook_saving.Notebook');
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name
         );
         $.ajax(url, settings);
     };
     
     /**
      * Success callback for saving a notebook.
      * 
      * @method save_notebook_success
      * @param {Integer} start the time when the save request started
      * @param {Object} data JSON representation of a notebook
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.save_notebook_success = function (start, data, status, xhr) {
         this.set_dirty(false);
         this.events.trigger('notebook_saved.Notebook');
         this._update_autosave_interval(start);
         if (this._checkpoint_after_save) {
             this.create_checkpoint();
             this._checkpoint_after_save = false;
         }
     };
     
     /**
      * update the autosave interval based on how long the last save took
      * 
      * @method _update_autosave_interval
      * @param {Integer} timestamp when the save request started
      */
     Notebook.prototype._update_autosave_interval = function (start) {
         var duration = (new Date().getTime() - start);
         if (this.autosave_interval) {
             // new save interval: higher of 10x save duration or parameter (default 30 seconds)
             var interval = Math.max(10 * duration, this.minimum_autosave_interval);
             // round to 10 seconds, otherwise we will be setting a new interval too often
             interval = 10000 * Math.round(interval / 10000);
             // set new interval, if it's changed
             if (interval != this.autosave_interval) {
                 this.set_autosave_interval(interval);
             }
         }
     };
     
     /**
      * Failure callback for saving a notebook.
      * 
      * @method save_notebook_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error HTTP error message
      */
     Notebook.prototype.save_notebook_error = function (xhr, status, error) {
         this.events.trigger('notebook_save_failed.Notebook', [xhr, status, error]);
     };
 
     /**
      * Explicitly trust the output of this notebook.
      *
      * @method trust_notebook
      */
     Notebook.prototype.trust_notebook = function (extra_settings) {
         var body = $("<div>").append($("<p>")
             .text("A trusted IPython notebook may execute hidden malicious code ")
             .append($("<strong>")
                 .append(
                     $("<em>").text("when you open it")
                 )
             ).append(".").append(
                 " Selecting trust will immediately reload this notebook in a trusted state."
             ).append(
                 " For more information, see the "
             ).append($("<a>").attr("href", "http://ipython.org/ipython-doc/2/notebook/security.html")
                 .text("IPython security documentation")
             ).append(".")
         );
 
         var nb = this;
         dialog.modal({
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title: "Trust this notebook?",
             body: body,
 
             buttons: {
                 Cancel : {},
                 Trust : {
                     class : "btn-danger",
                     click : function () {
                         var cells = nb.get_cells();
                         for (var i = 0; i < cells.length; i++) {
                             var cell = cells[i];
                             if (cell.cell_type == 'code') {
                                 cell.output_area.trusted = true;
                             }
                         }
                         this.events.on('notebook_saved.Notebook', function () {
                             window.location.reload();
                         });
                         nb.save_notebook();
                     }
                 }
             }
         });
     };
 
     Notebook.prototype.new_notebook = function(){
         var path = this.notebook_path;
         var base_url = this.base_url;
         var settings = {
             processData : false,
             cache : false,
             type : "POST",
             dataType : "json",
             async : false,
             success : function (data, status, xhr){
                 var notebook_name = data.name;
                 window.open(
                     utils.url_join_encode(
                         base_url,
                         'notebooks',
                         path,
                         notebook_name
                     ),
                     '_blank'
                 );
             },
             error : utils.log_ajax_error,
         };
         var url = utils.url_join_encode(
             base_url,
             'api/notebooks',
             path
         );
         $.ajax(url,settings);
     };
 
 
     Notebook.prototype.copy_notebook = function(){
         var path = this.notebook_path;
         var base_url = this.base_url;
         var settings = {
             processData : false,
             cache : false,
             type : "POST",
             dataType : "json",
             data : JSON.stringify({copy_from : this.notebook_name}),
             async : false,
             success : function (data, status, xhr) {
                 window.open(utils.url_join_encode(
                     base_url,
                     'notebooks',
                     data.path,
                     data.name
                 ), '_blank');
             },
             error : utils.log_ajax_error,
         };
         var url = utils.url_join_encode(
             base_url,
             'api/notebooks',
             path
         );
         $.ajax(url,settings);
     };
 
     Notebook.prototype.rename = function (nbname) {
         var that = this;
         if (!nbname.match(/\.ipynb$/)) {
             nbname = nbname + ".ipynb";
         }
         var data = {name: nbname};
         var settings = {
             processData : false,
             cache : false,
             type : "PATCH",
             data : JSON.stringify(data),
             dataType: "json",
             headers : {'Content-Type': 'application/json'},
             success : $.proxy(that.rename_success, this),
             error : $.proxy(that.rename_error, this)
         };
         this.events.trigger('rename_notebook.Notebook', data);
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name
         );
         $.ajax(url, settings);
     };
 
     Notebook.prototype.delete = function () {
         var that = this;
         var settings = {
             processData : false,
             cache : false,
             type : "DELETE",
             dataType: "json",
             error : utils.log_ajax_error,
         };
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name
         );
         $.ajax(url, settings);
     };
 
     
     Notebook.prototype.rename_success = function (json, status, xhr) {
         var name = this.notebook_name = json.name;
         var path = json.path;
         this.session.rename_notebook(name, path);
         this.events.trigger('notebook_renamed.Notebook', json);
     };
 
     Notebook.prototype.rename_error = function (xhr, status, error) {
         var that = this;
         var dialog_body = $('<div/>').append(
             $("<p/>").addClass("rename-message")
             .text('This notebook name already exists.')
         );
         this.events.trigger('notebook_rename_failed.Notebook', [xhr, status, error]);
         dialog.modal({
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title: "Notebook Rename Error!",
             body: dialog_body,
             buttons : {
                 "Cancel": {},
                 "OK": {
                     class: "btn-primary",
                     click: function () {
                         this.save_widget.rename_notebook({notebook:that});
                 }}
                 },
             open : function (event, ui) {
                 var that = $(this);
                 // Upon ENTER, click the OK button.
                 that.find('input[type="text"]').keydown(function (event, ui) {
                     if (event.which === this.keyboard.keycodes.enter) {
                         that.find('.btn-primary').first().click();
                     }
                 });
                 that.find('input[type="text"]').focus();
             }
         });
     };
 
     /**
      * Request a notebook's data from the server.
      * 
      * @method load_notebook
      * @param {String} notebook_name and path A notebook to load
      */
     Notebook.prototype.load_notebook = function (notebook_name, notebook_path) {
         var that = this;
         this.notebook_name = notebook_name;
         this.notebook_path = notebook_path;
         // We do the call with settings so we can set cache to false.
         var settings = {
             processData : false,
             cache : false,
             type : "GET",
             dataType : "json",
             success : $.proxy(this.load_notebook_success,this),
             error : $.proxy(this.load_notebook_error,this),
         };
         this.events.trigger('notebook_loading.Notebook');
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name
         );
         $.ajax(url, settings);
     };
 
     /**
      * Success callback for loading a notebook from the server.
      * 
      * Load notebook data from the JSON response.
      * 
      * @method load_notebook_success
      * @param {Object} data JSON representation of a notebook
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.load_notebook_success = function (data, status, xhr) {
         this.fromJSON(data);
         if (this.ncells() === 0) {
             this.insert_cell_below('code');
             this.edit_mode(0);
         } else {
             this.select(0);
             this.handle_command_mode(this.get_cell(0));
         }
         this.set_dirty(false);
         this.scroll_to_top();
         if (data.orig_nbformat !== undefined && data.nbformat !== data.orig_nbformat) {
             var msg = "This notebook has been converted from an older " +
             "notebook format (v"+data.orig_nbformat+") to the current notebook " +
             "format (v"+data.nbformat+"). The next time you save this notebook, the " +
             "newer notebook format will be used and older versions of IPython " +
             "may not be able to read it. To keep the older version, close the " +
             "notebook without saving it.";
             dialog.modal({
                 notebook: this,
                 keyboard_manager: this.keyboard_manager,
                 title : "Notebook converted",
                 body : msg,
                 buttons : {
                     OK : {
                         class : "btn-primary"
                     }
                 }
             });
         } else if (data.orig_nbformat_minor !== undefined && data.nbformat_minor !== data.orig_nbformat_minor) {
             var that = this;
             var orig_vs = 'v' + data.nbformat + '.' + data.orig_nbformat_minor;
             var this_vs = 'v' + data.nbformat + '.' + this.nbformat_minor;
             var msg = "This notebook is version " + orig_vs + ", but we only fully support up to " +
             this_vs + ".  You can still work with this notebook, but some features " +
             "introduced in later notebook versions may not be available.";
 
             dialog.modal({
                 notebook: this,
                 keyboard_manager: this.keyboard_manager,
                 title : "Newer Notebook",
                 body : msg,
                 buttons : {
                     OK : {
                         class : "btn-danger"
                     }
                 }
             });
 
         }
         
         // Create the session after the notebook is completely loaded to prevent
         // code execution upon loading, which is a security risk.
         if (this.session === null) {
             var kernelspec = this.metadata.kernelspec || {};
             var kernel_name = kernelspec.name || this.default_kernel_name;
 
             this.start_session(kernel_name);
         }
         // load our checkpoint list
         this.list_checkpoints();
         
         // load toolbar state
         if (this.metadata.celltoolbar) {
             celltoolbar.CellToolbar.global_show();
-            celltoolbar.CellToolbar.activate_preset(this.metadata.celltoolbar, this.events);
+            celltoolbar.CellToolbar.activate_preset(this.metadata.celltoolbar);
         } else {
             celltoolbar.CellToolbar.global_hide();
         }
 
         // now that we're fully loaded, it is safe to restore save functionality
         delete(this.save_notebook);
         this.events.trigger('notebook_loaded.Notebook');
     };
 
     /**
      * Failure callback for loading a notebook from the server.
      * 
      * @method load_notebook_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error HTTP error message
      */
     Notebook.prototype.load_notebook_error = function (xhr, status, error) {
         this.events.trigger('notebook_load_failed.Notebook', [xhr, status, error]);
         var msg;
         if (xhr.status === 400) {
             msg = error;
         } else if (xhr.status === 500) {
             msg = "An unknown error occurred while loading this notebook. " +
             "This version can load notebook formats " +
             "v" + this.nbformat + " or earlier.";
         }
         dialog.modal({
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title: "Error loading notebook",
             body : msg,
             buttons : {
                 "OK": {}
             }
         });
     };
 
     /*********************  checkpoint-related  *********************/
     
     /**
      * Save the notebook then immediately create a checkpoint.
      * 
      * @method save_checkpoint
      */
     Notebook.prototype.save_checkpoint = function () {
         this._checkpoint_after_save = true;
         this.save_notebook();
     };
     
     /**
      * Add a checkpoint for this notebook.
      * for use as a callback from checkpoint creation.
      * 
      * @method add_checkpoint
      */
     Notebook.prototype.add_checkpoint = function (checkpoint) {
         var found = false;
         for (var i = 0; i < this.checkpoints.length; i++) {
             var existing = this.checkpoints[i];
             if (existing.id == checkpoint.id) {
                 found = true;
                 this.checkpoints[i] = checkpoint;
                 break;
             }
         }
         if (!found) {
             this.checkpoints.push(checkpoint);
         }
         this.last_checkpoint = this.checkpoints[this.checkpoints.length - 1];
     };
     
     /**
      * List checkpoints for this notebook.
      * 
      * @method list_checkpoints
      */
     Notebook.prototype.list_checkpoints = function () {
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name,
             'checkpoints'
         );
         $.get(url).done(
             $.proxy(this.list_checkpoints_success, this)
         ).fail(
             $.proxy(this.list_checkpoints_error, this)
         );
     };
 
     /**
      * Success callback for listing checkpoints.
      * 
      * @method list_checkpoint_success
      * @param {Object} data JSON representation of a checkpoint
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.list_checkpoints_success = function (data, status, xhr) {
         data = $.parseJSON(data);
         this.checkpoints = data;
         if (data.length) {
             this.last_checkpoint = data[data.length - 1];
         } else {
             this.last_checkpoint = null;
         }
         this.events.trigger('checkpoints_listed.Notebook', [data]);
     };
 
     /**
      * Failure callback for listing a checkpoint.
      * 
      * @method list_checkpoint_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error_msg HTTP error message
      */
     Notebook.prototype.list_checkpoints_error = function (xhr, status, error_msg) {
         this.events.trigger('list_checkpoints_failed.Notebook');
     };
     
     /**
      * Create a checkpoint of this notebook on the server from the most recent save.
      * 
      * @method create_checkpoint
      */
     Notebook.prototype.create_checkpoint = function () {
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name,
             'checkpoints'
         );
         $.post(url).done(
             $.proxy(this.create_checkpoint_success, this)
         ).fail(
             $.proxy(this.create_checkpoint_error, this)
         );
     };
 
     /**
      * Success callback for creating a checkpoint.
      * 
      * @method create_checkpoint_success
      * @param {Object} data JSON representation of a checkpoint
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.create_checkpoint_success = function (data, status, xhr) {
         data = $.parseJSON(data);
         this.add_checkpoint(data);
         this.events.trigger('checkpoint_created.Notebook', data);
     };
 
     /**
      * Failure callback for creating a checkpoint.
      * 
      * @method create_checkpoint_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error_msg HTTP error message
      */
     Notebook.prototype.create_checkpoint_error = function (xhr, status, error_msg) {
         this.events.trigger('checkpoint_failed.Notebook');
     };
     
     Notebook.prototype.restore_checkpoint_dialog = function (checkpoint) {
         var that = this;
         checkpoint = checkpoint || this.last_checkpoint;
         if ( ! checkpoint ) {
             console.log("restore dialog, but no checkpoint to restore to!");
             return;
         }
         var body = $('<div/>').append(
             $('<p/>').addClass("p-space").text(
                 "Are you sure you want to revert the notebook to " +
                 "the latest checkpoint?"
             ).append(
                 $("<strong/>").text(
                     " This cannot be undone."
                 )
             )
         ).append(
             $('<p/>').addClass("p-space").text("The checkpoint was last updated at:")
         ).append(
             $('<p/>').addClass("p-space").text(
                 Date(checkpoint.last_modified)
             ).css("text-align", "center")
         );
         
         dialog.modal({
             notebook: this,
             keyboard_manager: this.keyboard_manager,
             title : "Revert notebook to checkpoint",
             body : body,
             buttons : {
                 Revert : {
                     class : "btn-danger",
                     click : function () {
                         that.restore_checkpoint(checkpoint.id);
                     }
                 },
                 Cancel : {}
                 }
         });
     };
     
     /**
      * Restore the notebook to a checkpoint state.
      * 
      * @method restore_checkpoint
      * @param {String} checkpoint ID
      */
     Notebook.prototype.restore_checkpoint = function (checkpoint) {
         this.events.trigger('notebook_restoring.Notebook', checkpoint);
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name,
             'checkpoints',
             checkpoint
         );
         $.post(url).done(
             $.proxy(this.restore_checkpoint_success, this)
         ).fail(
             $.proxy(this.restore_checkpoint_error, this)
         );
     };
     
     /**
      * Success callback for restoring a notebook to a checkpoint.
      * 
      * @method restore_checkpoint_success
      * @param {Object} data (ignored, should be empty)
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.restore_checkpoint_success = function (data, status, xhr) {
         this.events.trigger('checkpoint_restored.Notebook');
         this.load_notebook(this.notebook_name, this.notebook_path);
     };
 
     /**
      * Failure callback for restoring a notebook to a checkpoint.
      * 
      * @method restore_checkpoint_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error_msg HTTP error message
      */
     Notebook.prototype.restore_checkpoint_error = function (xhr, status, error_msg) {
         this.events.trigger('checkpoint_restore_failed.Notebook');
     };
     
     /**
      * Delete a notebook checkpoint.
      * 
      * @method delete_checkpoint
      * @param {String} checkpoint ID
      */
     Notebook.prototype.delete_checkpoint = function (checkpoint) {
         this.events.trigger('notebook_restoring.Notebook', checkpoint);
         var url = utils.url_join_encode(
             this.base_url,
             'api/notebooks',
             this.notebook_path,
             this.notebook_name,
             'checkpoints',
             checkpoint
         );
         $.ajax(url, {
             type: 'DELETE',
             success: $.proxy(this.delete_checkpoint_success, this),
             error: $.proxy(this.delete_checkpoint_error, this)
         });
     };
     
     /**
      * Success callback for deleting a notebook checkpoint
      * 
      * @method delete_checkpoint_success
      * @param {Object} data (ignored, should be empty)
      * @param {String} status Description of response status
      * @param {jqXHR} xhr jQuery Ajax object
      */
     Notebook.prototype.delete_checkpoint_success = function (data, status, xhr) {
         this.events.trigger('checkpoint_deleted.Notebook', data);
         this.load_notebook(this.notebook_name, this.notebook_path);
     };
 
     /**
      * Failure callback for deleting a notebook checkpoint.
      * 
      * @method delete_checkpoint_error
      * @param {jqXHR} xhr jQuery Ajax object
      * @param {String} status Description of response status
      * @param {String} error_msg HTTP error message
      */
     Notebook.prototype.delete_checkpoint_error = function (xhr, status, error_msg) {
         this.events.trigger('checkpoint_delete_failed.Notebook');
     };
 
 
     // For backwards compatability.
     IPython.Notebook = Notebook;
 
     return {'Notebook': Notebook};
 });

IPython/html/static/notebook/js/textcell.js

@@ -1,447 +1,446
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'base/js/namespace',
     'jquery',
     'notebook/js/cell',
     'base/js/security',
     'notebook/js/mathjaxutils',
     'notebook/js/celltoolbar',
     'components/marked/lib/marked',
 ], function(IPython, $, cell, security, mathjaxutils, celltoolbar, marked) {
     "use strict";
     var Cell = cell.Cell;
 
     var TextCell = function (options) {
         // Constructor
         //
         // Construct a new TextCell, codemirror mode is by default 'htmlmixed', 
         // and cell type is 'text' cell start as not redered.
         //
         // Parameters:
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          config: dictionary
         //          keyboard_manager: KeyboardManager instance 
         //          notebook: Notebook instance
         options = options || {};
 
         // in all TextCell/Cell subclasses
         // do not assign most of members here, just pass it down
         // in the options dict potentially overwriting what you wish.
         // they will be assigned in the base class.
         this.notebook = options.notebook;
         this.events = options.events;
         this.config = options.config;
         
         // we cannot put this as a class key as it has handle to "this".
         var cm_overwrite_options  = {
             onKeyEvent: $.proxy(this.handle_keyevent,this)
         };
         var config = this.mergeopt(TextCell, this.config, {cm_config:cm_overwrite_options});
         Cell.apply(this, [{
                     config: config, 
                     keyboard_manager: options.keyboard_manager, 
                     events: this.events}]);
 
         this.cell_type = this.cell_type || 'text';
         mathjaxutils = mathjaxutils;
         this.rendered = false;
     };
 
     TextCell.prototype = new Cell();
 
     TextCell.options_default = {
         cm_config : {
             extraKeys: {"Tab": "indentMore","Shift-Tab" : "indentLess"},
             mode: 'htmlmixed',
             lineWrapping : true,
         }
     };
 
 
     /**
      * Create the DOM element of the TextCell
      * @method create_element
      * @private
      */
     TextCell.prototype.create_element = function () {
         Cell.prototype.create_element.apply(this, arguments);
 
         var cell = $("<div>").addClass('cell text_cell border-box-sizing');
         cell.attr('tabindex','2');
 
         var prompt = $('<div/>').addClass('prompt input_prompt');
         cell.append(prompt);
         var inner_cell = $('<div/>').addClass('inner_cell');
         this.celltoolbar = new celltoolbar.CellToolbar({
             cell: this, 
-            events: this.events, 
             notebook: this.notebook});
         inner_cell.append(this.celltoolbar.element);
         var input_area = $('<div/>').addClass('input_area');
         this.code_mirror = new CodeMirror(input_area.get(0), this.cm_config);
         // The tabindex=-1 makes this div focusable.
         var render_area = $('<div/>').addClass('text_cell_render border-box-sizing').
             addClass('rendered_html').attr('tabindex','-1');
         inner_cell.append(input_area).append(render_area);
         cell.append(inner_cell);
         this.element = cell;
     };
 
 
     /**
      * Bind the DOM evet to cell actions
      * Need to be called after TextCell.create_element
      * @private
      * @method bind_event
      */
     TextCell.prototype.bind_events = function () {
         Cell.prototype.bind_events.apply(this);
         var that = this;
 
         this.element.dblclick(function () {
             if (that.selected === false) {
                 this.events.trigger('select.Cell', {'cell':that});
             }
             var cont = that.unrender();
             if (cont) {
                 that.focus_editor();
             }
         });
     };
 
     // Cell level actions
     
     TextCell.prototype.select = function () {
         var cont = Cell.prototype.select.apply(this);
         if (cont) {
             if (this.mode === 'edit') {
                 this.code_mirror.refresh();
             }
         }
         return cont;
     };
 
     TextCell.prototype.unrender = function () {
         if (this.read_only) return;
         var cont = Cell.prototype.unrender.apply(this);
         if (cont) {
             var text_cell = this.element;
             var output = text_cell.find("div.text_cell_render");
             output.hide();
             text_cell.find('div.input_area').show();
             if (this.get_text() === this.placeholder) {
                 this.set_text('');
             }
             this.refresh();
         }
         if (this.celltoolbar.ui_controls_list.length) {
             this.celltoolbar.show();
         }
         return cont;
     };
 
     TextCell.prototype.execute = function () {
         this.render();
     };
 
     /**
      * setter: {{#crossLink "TextCell/set_text"}}{{/crossLink}}
      * @method get_text
      * @retrun {string} CodeMirror current text value
      */
     TextCell.prototype.get_text = function() {
         return this.code_mirror.getValue();
     };
 
     /**
      * @param {string} text - Codemiror text value
      * @see TextCell#get_text
      * @method set_text
      * */
     TextCell.prototype.set_text = function(text) {
         this.code_mirror.setValue(text);
         this.code_mirror.refresh();
     };
 
     /**
      * setter :{{#crossLink "TextCell/set_rendered"}}{{/crossLink}}
      * @method get_rendered
      * */
     TextCell.prototype.get_rendered = function() {
         return this.element.find('div.text_cell_render').html();
     };
 
     /**
      * @method set_rendered
      */
     TextCell.prototype.set_rendered = function(text) {
         this.element.find('div.text_cell_render').html(text);
         this.celltoolbar.hide();
     };
 
 
     /**
      * Create Text cell from JSON
      * @param {json} data - JSON serialized text-cell
      * @method fromJSON
      */
     TextCell.prototype.fromJSON = function (data) {
         Cell.prototype.fromJSON.apply(this, arguments);
         if (data.cell_type === this.cell_type) {
             if (data.source !== undefined) {
                 this.set_text(data.source);
                 // make this value the starting point, so that we can only undo
                 // to this state, instead of a blank cell
                 this.code_mirror.clearHistory();
                 // TODO: This HTML needs to be treated as potentially dangerous
                 // user input and should be handled before set_rendered.         
                 this.set_rendered(data.rendered || '');
                 this.rendered = false;
                 this.render();
             }
         }
     };
 
     /** Generate JSON from cell
      * @return {object} cell data serialised to json
      */
     TextCell.prototype.toJSON = function () {
         var data = Cell.prototype.toJSON.apply(this);
         data.source = this.get_text();
         if (data.source == this.placeholder) {
             data.source = "";
         }
         return data;
     };
 
 
     var MarkdownCell = function (options) {
         // Constructor
         //
         // Parameters:
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          config: dictionary
         //          keyboard_manager: KeyboardManager instance 
         //          notebook: Notebook instance
         options = options || {};
         var config = this.mergeopt(MarkdownCell, options.config);
         TextCell.apply(this, [$.extend({}, options, {config: config})]);
 
         this.cell_type = 'markdown';
     };
 
     MarkdownCell.options_default = {
         cm_config: {
             mode: 'ipythongfm'
         },
         placeholder: "Type *Markdown* and LaTeX: $\\alpha^2$"
     };
 
     MarkdownCell.prototype = new TextCell();
 
     /**
      * @method render
      */
     MarkdownCell.prototype.render = function () {
         var cont = TextCell.prototype.render.apply(this);
         if (cont) {
             var text = this.get_text();
             var math = null;
             if (text === "") { text = this.placeholder; }
             var text_and_math = mathjaxutils.remove_math(text);
             text = text_and_math[0];
             math = text_and_math[1];
             var html = marked.parser(marked.lexer(text));
             html = mathjaxutils.replace_math(html, math);
             html = security.sanitize_html(html);
             html = $($.parseHTML(html));
             // links in markdown cells should open in new tabs
             html.find("a[href]").not('[href^="#"]').attr("target", "_blank");
             this.set_rendered(html);
             this.element.find('div.input_area').hide();
             this.element.find("div.text_cell_render").show();
             this.typeset();
         }
         return cont;
     };
 
 
     var RawCell = function (options) {
         // Constructor
         //
         // Parameters:
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          config: dictionary
         //          keyboard_manager: KeyboardManager instance 
         //          notebook: Notebook instance
         options = options || {};
         var config = this.mergeopt(RawCell, options.config);
         TextCell.apply(this, [$.extend({}, options, {config: config})]);
 
         // RawCell should always hide its rendered div
         this.element.find('div.text_cell_render').hide();
         this.cell_type = 'raw';
     };
 
     RawCell.options_default = {
         placeholder : "Write raw LaTeX or other formats here, for use with nbconvert. " +
             "It will not be rendered in the notebook. " + 
             "When passing through nbconvert, a Raw Cell's content is added to the output unmodified."
     };
 
     RawCell.prototype = new TextCell();
 
     /** @method bind_events **/
     RawCell.prototype.bind_events = function () {
         TextCell.prototype.bind_events.apply(this);
         var that = this;
         this.element.focusout(function() {
             that.auto_highlight();
             that.render();
         });
 
         this.code_mirror.on('focus', function() { that.unrender(); });
     };
 
     /**
      * Trigger autodetection of highlight scheme for current cell
      * @method auto_highlight
      */
     RawCell.prototype.auto_highlight = function () {
         this._auto_highlight(this.config.raw_cell_highlight);
     };
 
     /** @method render **/
     RawCell.prototype.render = function () {
         var cont = TextCell.prototype.render.apply(this);
         if (cont){
             var text = this.get_text();
             if (text === "") { text = this.placeholder; }
             this.set_text(text);
             this.element.removeClass('rendered');
         }
         return cont;
     };
 
 
     var HeadingCell = function (options) {
         // Constructor
         //
         // Parameters:
         //  options: dictionary
         //      Dictionary of keyword arguments.
         //          events: $(Events) instance 
         //          config: dictionary
         //          keyboard_manager: KeyboardManager instance 
         //          notebook: Notebook instance
         options = options || {};
         var config = this.mergeopt(HeadingCell, options.config);
         TextCell.apply(this, [$.extend({}, options, {config: config})]);
 
         this.level = 1;
         this.cell_type = 'heading';
     };
 
     HeadingCell.options_default = {
         placeholder: "Type Heading Here"
     };
 
     HeadingCell.prototype = new TextCell();
 
     /** @method fromJSON */
     HeadingCell.prototype.fromJSON = function (data) {
         if (data.level !== undefined){
             this.level = data.level;
         }
         TextCell.prototype.fromJSON.apply(this, arguments);
     };
 
 
     /** @method toJSON */
     HeadingCell.prototype.toJSON = function () {
         var data = TextCell.prototype.toJSON.apply(this);
         data.level = this.get_level();
         return data;
     };
 
     /**
      * Change heading level of cell, and re-render
      * @method set_level
      */
     HeadingCell.prototype.set_level = function (level) {
         this.level = level;
         if (this.rendered) {
             this.rendered = false;
             this.render();
         }
     };
 
     /** The depth of header cell, based on html (h1 to h6)
      * @method get_level
      * @return {integer} level - for 1 to 6
      */
     HeadingCell.prototype.get_level = function () {
         return this.level;
     };
 
 
     HeadingCell.prototype.get_rendered = function () {
         var r = this.element.find("div.text_cell_render");
         return r.children().first().html();
     };
 
     HeadingCell.prototype.render = function () {
         var cont = TextCell.prototype.render.apply(this);
         if (cont) {
             var text = this.get_text();
             var math = null;
             // Markdown headings must be a single line
             text = text.replace(/\n/g, ' ');
             if (text === "") { text = this.placeholder; }
             text = new Array(this.level + 1).join("#") + " " + text;
             var text_and_math = mathjaxutils.remove_math(text);
             text = text_and_math[0];
             math = text_and_math[1];
             var html = marked.parser(marked.lexer(text));
             html = mathjaxutils.replace_math(html, math);
             html = security.sanitize_html(html);
             var h = $($.parseHTML(html));
             // add id and linkback anchor
             var hash = h.text().replace(/ /g, '-');
             h.attr('id', hash);
             h.append(
                 $('<a/>')
                     .addClass('anchor-link')
                     .attr('href', '#' + hash)
                     .text('¶')
             );
             this.set_rendered(h);
             this.element.find('div.input_area').hide();
             this.element.find("div.text_cell_render").show();
             this.typeset();
         }
         return cont;
     };
 
     // Backwards compatability.
     IPython.TextCell = TextCell;
     IPython.MarkdownCell = MarkdownCell;
     IPython.RawCell = RawCell;
     IPython.HeadingCell = HeadingCell;
 
     var textcell = {
         'TextCell': TextCell,
         'MarkdownCell': MarkdownCell,
         'RawCell': RawCell,
         'HeadingCell': HeadingCell,
     };
     return textcell;
 });