remove nbconvert_exporter handling from frontend

dispatch happens in the script exporter,
frontend doesn't need to know about it anymore.

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

@@ -1,396 +1,386
 // Copyright (c) IPython Development Team.
 // Distributed under the terms of the Modified BSD License.
 
 define([
     'jquery',
     'base/js/namespace',
     'base/js/dialog',
     'base/js/utils',
     'notebook/js/tour',
     'bootstrap',
     'moment',
 ], function($, IPython, dialog, utils, tour, bootstrap, moment) {
     "use strict";
     
     var MenuBar = function (selector, options) {
         /**
          * Constructor
          *
          * A MenuBar Class to generate the menubar of IPython notebook
          *
          * Parameters:
          *  selector: string
          *  options: dictionary
          *      Dictionary of keyword arguments.
          *          notebook: Notebook instance
          *          contents: ContentManager instance
          *          events: $(Events) instance
          *          save_widget: SaveWidget instance
          *          quick_help: QuickHelp instance
          *          base_url : string
          *          notebook_path : string
          *          notebook_name : string
          */
         options = options || {};
         this.base_url = options.base_url || utils.get_body_data("baseUrl");
         this.selector = selector;
         this.notebook = options.notebook;
         this.contents = options.contents;
         this.events = options.events;
         this.save_widget = options.save_widget;
         this.quick_help = options.quick_help;
 
         try {
             this.tour = new tour.Tour(this.notebook, this.events);
         } catch (e) {
             this.tour = undefined;
             console.log("Failed to instantiate Notebook Tour", e);
         }
 
         if (this.selector !== undefined) {
             this.element = $(selector);
             this.style();
             this.bind_events();
         }
     };
 
     // TODO: This has definitively nothing to do with style ...
     MenuBar.prototype.style = function () {
         var that = this;
         this.element.find("li").click(function (event, ui) {
                 // The selected cell loses focus when the menu is entered, so we
                 // re-select it upon selection.
                 var i = that.notebook.get_selected_index();
                 that.notebook.select(i);
             }
         );
     };
 
     MenuBar.prototype._nbconvert = function (format, download) {
         download = download || false;
         var notebook_path = this.notebook.notebook_path;
         var url = utils.url_join_encode(
             this.base_url,
             'nbconvert',
             format,
             notebook_path
         ) + "?download=" + download.toString();
         
         var w = window.open()
         if (this.notebook.dirty) {
             this.notebook.save_notebook().then(function() {
                 w.location = url;
             });
         } else {
             w.location = url;
         }
     };
 
     MenuBar.prototype._size_header = function() {
         /** 
          * Update header spacer size.
          */
         this.events.trigger('resize-header.Page');
     };
 
     MenuBar.prototype.bind_events = function () {
         /**
          *  File
          */
         var that = this;
         this.element.find('#new_notebook').click(function () {
             var w = window.open();
             // Create a new notebook in the same path as the current
             // notebook's path.
             var parent = utils.url_path_split(that.notebook.notebook_path)[0];
             that.contents.new_untitled(parent, {type: "notebook"}).then(
                     function (data) {
                         w.location = utils.url_join_encode(
                                 that.base_url, 'notebooks', data.path
                             );
                     },
                     function(error) {
                         w.close();
                         dialog.modal({
                             title : 'Creating Notebook Failed',
                             body : "The error was: " + error.message,
                             buttons : {'OK' : {'class' : 'btn-primary'}}
                         });
                     }
                 );
         });
         this.element.find('#open_notebook').click(function () {
             var parent = utils.url_path_split(that.notebook.notebook_path)[0];
             window.open(utils.url_join_encode(that.base_url, 'tree', parent));
         });
         this.element.find('#copy_notebook').click(function () {
             that.notebook.copy_notebook();
             return false;
         });
         this.element.find('#download_ipynb').click(function () {
             var base_url = that.notebook.base_url;
             var notebook_path = that.notebook.notebook_path;
             if (that.notebook.dirty) {
                 that.notebook.save_notebook({async : false});
             }
             
             var url = utils.url_join_encode(base_url, 'files', notebook_path);
             window.open(url + '?download=1');
         });
         
         this.element.find('#print_preview').click(function () {
             that._nbconvert('html', false);
         });
 
         this.element.find('#download_html').click(function () {
             that._nbconvert('html', true);
         });
 
         this.element.find('#download_rst').click(function () {
             that._nbconvert('rst', true);
         });
 
         this.element.find('#download_pdf').click(function () {
             that._nbconvert('pdf', true);
         });
 
+        this.element.find('#download_script').click(function () {
+            that._nbconvert('script', true);
+        });
+
         this.element.find('#rename_notebook').click(function () {
             that.save_widget.rename_notebook({notebook: that.notebook});
         });
         this.element.find('#save_checkpoint').click(function () {
             that.notebook.save_checkpoint();
         });
         this.element.find('#restore_checkpoint').click(function () {
         });
         this.element.find('#trust_notebook').click(function () {
             that.notebook.trust_notebook();
         });
         this.events.on('trust_changed.Notebook', function (event, trusted) {
             if (trusted) {
                 that.element.find('#trust_notebook')
                     .addClass("disabled")
                     .find("a").text("Trusted Notebook");
             } else {
                 that.element.find('#trust_notebook')
                     .removeClass("disabled")
                     .find("a").text("Trust Notebook");
             }
         });
         this.element.find('#kill_and_exit').click(function () {
             var close_window = function () {
                 /**
                  * allow closing of new tabs in Chromium, impossible in FF
                  */
                 window.open('', '_self', '');
                 window.close();
             };
             // finish with close on success or failure
             that.notebook.session.delete(close_window, close_window);
         });
         // Edit
         this.element.find('#cut_cell').click(function () {
             that.notebook.cut_cell();
         });
         this.element.find('#copy_cell').click(function () {
             that.notebook.copy_cell();
         });
         this.element.find('#delete_cell').click(function () {
             that.notebook.delete_cell();
         });
         this.element.find('#undelete_cell').click(function () {
             that.notebook.undelete_cell();
         });
         this.element.find('#split_cell').click(function () {
             that.notebook.split_cell();
         });
         this.element.find('#merge_cell_above').click(function () {
             that.notebook.merge_cell_above();
         });
         this.element.find('#merge_cell_below').click(function () {
             that.notebook.merge_cell_below();
         });
         this.element.find('#move_cell_up').click(function () {
             that.notebook.move_cell_up();
         });
         this.element.find('#move_cell_down').click(function () {
             that.notebook.move_cell_down();
         });
         this.element.find('#edit_nb_metadata').click(function () {
             that.notebook.edit_metadata({
                 notebook: that.notebook,
                 keyboard_manager: that.notebook.keyboard_manager});
         });
         
         // View
         this.element.find('#toggle_header').click(function () {
             $('div#header-container').toggle();
             that._size_header();
         });
         this.element.find('#toggle_toolbar').click(function () {
             $('div#maintoolbar').toggle();
             that._size_header();
         });
         // Insert
         this.element.find('#insert_cell_above').click(function () {
             that.notebook.insert_cell_above('code');
             that.notebook.select_prev();
         });
         this.element.find('#insert_cell_below').click(function () {
             that.notebook.insert_cell_below('code');
             that.notebook.select_next();
         });
         // Cell
         this.element.find('#run_cell').click(function () {
             that.notebook.execute_cell();
         });
         this.element.find('#run_cell_select_below').click(function () {
             that.notebook.execute_cell_and_select_below();
         });
         this.element.find('#run_cell_insert_below').click(function () {
             that.notebook.execute_cell_and_insert_below();
         });
         this.element.find('#run_all_cells').click(function () {
             that.notebook.execute_all_cells();
         });
         this.element.find('#run_all_cells_above').click(function () {
             that.notebook.execute_cells_above();
         });
         this.element.find('#run_all_cells_below').click(function () {
             that.notebook.execute_cells_below();
         });
         this.element.find('#to_code').click(function () {
             that.notebook.to_code();
         });
         this.element.find('#to_markdown').click(function () {
             that.notebook.to_markdown();
         });
         this.element.find('#to_raw').click(function () {
             that.notebook.to_raw();
         });
         
         this.element.find('#toggle_current_output').click(function () {
             that.notebook.toggle_output();
         });
         this.element.find('#toggle_current_output_scroll').click(function () {
             that.notebook.toggle_output_scroll();
         });
         this.element.find('#clear_current_output').click(function () {
             that.notebook.clear_output();
         });
         
         this.element.find('#toggle_all_output').click(function () {
             that.notebook.toggle_all_output();
         });
         this.element.find('#toggle_all_output_scroll').click(function () {
             that.notebook.toggle_all_output_scroll();
         });
         this.element.find('#clear_all_output').click(function () {
             that.notebook.clear_all_output();
         });
         
         // Kernel
         this.element.find('#int_kernel').click(function () {
             that.notebook.kernel.interrupt();
         });
         this.element.find('#restart_kernel').click(function () {
             that.notebook.restart_kernel();
         });
         this.element.find('#reconnect_kernel').click(function () {
             that.notebook.kernel.reconnect();
         });
         // Help
         if (this.tour) {
             this.element.find('#notebook_tour').click(function () {
                 that.tour.start();
             });
         } else {
             this.element.find('#notebook_tour').addClass("disabled");
         }
         this.element.find('#keyboard_shortcuts').click(function () {
             that.quick_help.show_keyboard_shortcuts();
         });
         
         this.update_restore_checkpoint(null);
         
         this.events.on('checkpoints_listed.Notebook', function (event, data) {
             that.update_restore_checkpoint(that.notebook.checkpoints);
         });
         
         this.events.on('checkpoint_created.Notebook', function (event, data) {
             that.update_restore_checkpoint(that.notebook.checkpoints);
         });
         
         this.events.on('notebook_loaded.Notebook', function() {
             var langinfo = that.notebook.metadata.language_info || {};
             that.update_nbconvert_script(langinfo);
         });
         
         this.events.on('kernel_ready.Kernel', function(event, data) {
             var langinfo = data.kernel.info_reply.language_info || {};
             that.update_nbconvert_script(langinfo);
         });
     };
 
     MenuBar.prototype.update_restore_checkpoint = function(checkpoints) {
         var ul = this.element.find("#restore_checkpoint").find("ul");
         ul.empty();
         if (!checkpoints || checkpoints.length === 0) {
             ul.append(
                 $("<li/>")
                 .addClass("disabled")
                 .append(
                     $("<a/>")
                     .text("No checkpoints")
                 )
             );
             return;
         }
         
         var that = this;
         checkpoints.map(function (checkpoint) {
             var d = new Date(checkpoint.last_modified);
             ul.append(
                 $("<li/>").append(
                     $("<a/>")
                     .attr("href", "#")
                     .text(moment(d).format("LLLL"))
                     .click(function () {
                         that.notebook.restore_checkpoint_dialog(checkpoint);
                     })
                 )
             );
         });
     };
     
     MenuBar.prototype.update_nbconvert_script = function(langinfo) {
         /**
          * Set the 'Download as foo' menu option for the relevant language.
          */
         var el = this.element.find('#download_script');
         var that = this;
         
         // Set menu entry text to e.g. "Python (.py)"
         var langname = (langinfo.name || 'Script')
         langname = langname.charAt(0).toUpperCase()+langname.substr(1) // Capitalise
         el.find('a').text(langname + ' ('+(langinfo.file_extension || 'txt')+')');
-        
-        // Unregister any previously registered handlers
-        el.off('click');
-        if (langinfo.nbconvert_exporter) {
-            // Metadata specifies a specific exporter, e.g. 'python'
-            el.click(function() {
-                that._nbconvert(langinfo.nbconvert_exporter, true);
-            });
-        } else {
-            // Use generic 'script' exporter
-            el.click(function() {
-                that._nbconvert('script', true);
-            });
-        }
     };
 
     // Backwards compatability.
     IPython.MenuBar = MenuBar;
 
     return {'MenuBar': MenuBar};
 });