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// Copyright (c) IPython Development Team.
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// Distributed under the terms of the Modified BSD License.
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define([
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'jquery',
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'base/js/namespace',
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'base/js/dialog',
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'base/js/utils',
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], function($, IPython, dialog, utils) {
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"use strict";
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var KernelSelector = function(selector, notebook) {
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var that = this;
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this.selector = selector;
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this.notebook = notebook;
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this.notebook.set_kernelselector(this);
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this.events = notebook.events;
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this.current_selection = null;
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this.kernelspecs = {};
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if (this.selector !== undefined) {
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this.element = $(selector);
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this.request_kernelspecs();
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}
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this.bind_events();
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// Make the object globally available for user convenience & inspection
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IPython.kernelselector = this;
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this._finish_load = null;
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this.loaded = new Promise(function(resolve, reject) {
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that._finish_load = resolve;
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});
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Object.seal(this);
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};
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KernelSelector.prototype.request_kernelspecs = function() {
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var url = utils.url_join_encode(this.notebook.base_url, 'api/kernelspecs');
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utils.promising_ajax(url).then($.proxy(this._got_kernelspecs, this));
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};
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KernelSelector.prototype._got_kernelspecs = function(data) {
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var that = this;
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this.kernelspecs = data.kernelspecs;
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var change_kernel_submenu = $("#menu-change-kernel-submenu");
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var new_notebook_submenu = $("#menu-new-notebook-submenu");
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var keys = Object.keys(data.kernelspecs).sort(function (a, b) {
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// sort by display_name
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var da = data.kernelspecs[a].spec.display_name;
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var db = data.kernelspecs[b].spec.display_name;
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if (da === db) {
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return 0;
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} else if (da > db) {
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return 1;
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} else {
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return -1;
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}
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});
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keys.map(function (key) {
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// Create the Kernel > Change kernel submenu
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var ks = data.kernelspecs[key];
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change_kernel_submenu.append(
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$("<li>").attr("id", "kernel-submenu-"+ks.name).append(
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$('<a>')
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.attr('href', '#')
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.click( function () {
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that.set_kernel(ks.name);
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})
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.text(ks.spec.display_name)
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)
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);
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// Create the File > New Notebook submenu
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new_notebook_submenu.append(
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$("<li>").attr("id", "new-notebook-submenu-"+ks.name).append(
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$('<a>')
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.attr('href', '#')
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.click( function () {
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that.new_notebook(ks.name);
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})
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.text(ks.spec.display_name)
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)
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);
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});
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// trigger loaded promise
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this._finish_load();
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};
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KernelSelector.prototype._spec_changed = function (event, ks) {
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/** event handler for spec_changed */
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// update selection
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this.current_selection = ks.name;
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// put the current kernel at the top of File > New Notebook
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var cur_kernel_entry = $("#new-notebook-submenu-" + ks.name);
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var parent = cur_kernel_entry.parent();
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// do something only if there is more than one kernel
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if (parent.children().length > 1) {
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// first, sort back the submenu
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parent.append(
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parent.children("li[class!='divider']").sort(
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function (a,b) {
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var da = $("a",a).text();
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var db = $("a",b).text();
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if (da === db) {
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return 0;
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} else if (da > db) {
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return 1;
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} else {
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return -1;
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}}));
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// then, if there is no divider yet, add one
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if (!parent.children("li[class='divider']").length) {
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parent.prepend($("<li>").attr("class","divider"));
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}
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// finally, put the current kernel at the top
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parent.prepend(cur_kernel_entry);
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}
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// load logo
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var logo_img = this.element.find("img.current_kernel_logo");
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$("#kernel_indicator").find('.kernel_indicator_name').text(ks.spec.display_name);
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if (ks.resources['logo-64x64']) {
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logo_img.attr("src", ks.resources['logo-64x64']);
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logo_img.show();
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} else {
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logo_img.hide();
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}
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// load kernel css
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var css_url = ks.resources['kernel.css'];
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if (css_url) {
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$('#kernel-css').attr('href', css_url);
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} else {
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$('#kernel-css').attr('href', '');
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}
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// load kernel js
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if (ks.resources['kernel.js']) {
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require([ks.resources['kernel.js']],
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function (kernel_mod) {
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if (kernel_mod && kernel_mod.onload) {
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kernel_mod.onload();
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} else {
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console.warn("Kernel " + ks.name + " has a kernel.js file that does not contain "+
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"any asynchronous module definition. This is undefined behavior "+
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"and not recommended.");
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}
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}, function (err) {
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console.warn("Failed to load kernel.js from ", ks.resources['kernel.js'], err);
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}
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);
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}
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};
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KernelSelector.prototype.set_kernel = function (kernel_name) {
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/** set the kernel by name, ensuring kernelspecs have been loaded, first */
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var that = this;
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return this.loaded.then(function () {
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that._set_kernel(kernel_name);
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});
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};
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KernelSelector.prototype._set_kernel = function (kernel_name) {
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/** Actually set the kernel (kernelspecs have been loaded) */
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if (kernel_name === this.current_selection) {
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// only trigger event if value changed
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return;
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}
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var ks = this.kernelspecs[kernel_name];
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if (this.notebook._session_starting) {
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console.error("Cannot change kernel while waiting for pending session start.");
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return;
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}
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this.current_selection = kernel_name;
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this.events.trigger('spec_changed.Kernel', ks);
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};
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KernelSelector.prototype.new_notebook = function (kernel_name) {
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var w = window.open();
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// Create a new notebook in the same path as the current
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// notebook's path.
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var that = this;
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var parent = utils.url_path_split(that.notebook.notebook_path)[0];
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that.notebook.contents.new_untitled(parent, {type: "notebook"}).then(
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function (data) {
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var url = utils.url_join_encode(
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that.notebook.base_url, 'notebooks', data.path
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);
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url += "?kernel_name=" + kernel_name;
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w.location = url;
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},
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function(error) {
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w.close();
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dialog.modal({
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title : 'Creating Notebook Failed',
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body : "The error was: " + error.message,
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buttons : {'OK' : {'class' : 'btn-primary'}}
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});
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}
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);
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};
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KernelSelector.prototype.lock_switch = function() {
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// should set a flag and display warning+reload if user want to
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// re-change kernel. As UI discussion never finish
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// making that a separate PR.
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console.warn('switching kernel is not guaranteed to work !');
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};
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KernelSelector.prototype.bind_events = function() {
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var that = this;
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this.events.on('spec_changed.Kernel', $.proxy(this._spec_changed, this));
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this.events.on('kernel_created.Session', function (event, data) {
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that.set_kernel(data.kernel.name);
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});
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var logo_img = this.element.find("img.current_kernel_logo");
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logo_img.on("load", function() {
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logo_img.show();
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});
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logo_img.on("error", function() {
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logo_img.hide();
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});
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};
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return {'KernelSelector': KernelSelector};
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});
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