Update Bootstrap to v4.1, fix chosen.js and pagedown on multiple sites

app/assets/javascripts/base.js

@@ -8,20 +8,18 @@ window.CodeOcean = {
   }
 };
 
-$(function() {
-  var ANIMATION_DURATION = 500;
+var ANIMATION_DURATION = 500;
 
-  $.isController = function(name) {
+$.isController = function(name) {
   return $('.container[data-controller="' + name + '"]').isPresent();
-  };
+};
 
-  $.fn.isPresent = function() {
+$.fn.isPresent = function() {
   return this.length > 0;
-  };
+};
 
-  $.fn.scrollTo = function(selector) {
+$.fn.scrollTo = function(selector) {
   $(this).animate({
     scrollTop: $(selector).offset().top - $(this).offset().top + $(this).scrollTop()
   }, ANIMATION_DURATION);
-  };
-});
+};

app/assets/javascripts/bootstrap-dropdown-submenu.js

@@ -14,7 +14,7 @@ $(document).on('turbolinks:load', function() {
     var menu = $(this).parent().find("ul");
     var menupos = menu.offset();
 
-    var newPos;
+    var newPos = 0.0;
     if ((menupos.left + menu.width()) + 30 > $(window).width()) {
       newPos = -menu.width();
     } else {

app/assets/javascripts/editor/editor.js.erb

@@ -33,6 +33,7 @@ var CodeOceanEditor = {
   <% @config ||= CodeOcean::Config.new(:code_ocean).read(erb: false) %>
   sendEvents: <%= @config['codeocean_events'] ? @config['codeocean_events']['enabled'] : false %>,
   eventURL: "<%= @config['codeocean_events'] ? events_path : '' %>",
+  fileTypeURL: "<%= file_types_path %>",
 
 
 configureEditors: function () {
@@ -43,7 +44,7 @@ configureEditors: function () {
 
   confirmDestroy: function (event) {
     event.preventDefault();
-    if (confirm($(this).data('message-confirm'))) {
+    if (confirm($(event.target).data('message-confirm'))) {
       this.destroyFile();
     }
   },
@@ -63,7 +64,7 @@ configureEditors: function () {
     if ($('#output-' + index).isPresent()) {
       return $('#output-' + index);
     } else {
-      var element = $('<pre>').attr('id', 'output-' + index);
+      var element = $('<pre class="mt-2">').attr('id', 'output-' + index);
       $('#output').append(element);
       return element;
     }
@@ -79,13 +80,13 @@ configureEditors: function () {
     }
   },
 
-  getPanelClass: function (result) {
+  getCardClass: function (result) {
     if (result.stderr && !result.score) {
-      return 'panel-danger';
+      return 'card bg-danger text-white';
     } else if (result.score < 1) {
-      return 'panel-warning';
+      return 'card bg-warning';
     } else {
-      return 'panel-success';
+      return 'card bg-success text-white';
     }
   },
 
@@ -107,11 +108,22 @@ configureEditors: function () {
     progress_bar.css('width', percentage + '%');
   },
 
+  // The event ready.jstree is fired too early and thus doesn't work.
+  selectFileInJsTree: function(filetree, file_id) {
+    if (!filetree.hasClass('jstree-loading')) {
+      filetree.jstree("deselect_all");
+      filetree.jstree().select_node(file_id);
+    } else {
+      setTimeout(this.selectFileInJsTree.bind(null, filetree, file_id), 250);
+    }
+  },
+
   showFirstFile: function() {
     var frame = $('.frame[data-role="main_file"]').isPresent() ? $('.frame[data-role="main_file"]') : $('.frame').first();
     var file_id = frame.find('.editor').data('file-id');
     this.setActiveFile(frame.data('filename'), file_id);
-    $('#files').jstree().select_node(file_id);
+    var filetree = $('#files');
+    this.selectFileInJsTree(filetree, file_id);
     this.showFrame(frame);
     this.toggleButtonStates();
   },
@@ -124,11 +136,11 @@ configureEditors: function () {
 
   getProgressBarClass: function (percentage) {
     if (percentage < this.ADEQUATE_PERCENTAGE) {
-      return 'progress-bar progress-bar-striped progress-bar-danger';
+      return 'progress-bar progress-bar-striped bg-danger';
     } else if (percentage < this.SUCCESSFULL_PERCENTAGE) {
-      return 'progress-bar progress-bar-striped progress-bar-warning';
+      return 'progress-bar progress-bar-striped bg-warning';
     } else {
-      return 'progress-bar progress-bar-striped progress-bar-success';
+      return 'progress-bar progress-bar-striped bg-success';
     }
   },
 
@@ -158,7 +170,7 @@ configureEditors: function () {
         category: 'editor_paste',
         data: pasteObject.text,
         exercise_id: $('#editor').data('exercise-id'),
-        file_id: $(this).data('file-id')
+        file_id: $(event.target).data('file-id')
       });
     }
   },
@@ -266,6 +278,21 @@ configureEditors: function () {
     this.initializeRequestForComments()
   },
 
+  updateEditorModeToFileTypeID: function (editor, fileTypeID) {
+    var newMode = 'ace/mode/text'
+
+    $.ajax(this.fileTypeURL + '/' + fileTypeID, {
+      dataType: 'json'
+    }).done(function (data) {
+        if (data['editor_mode'] !== null) {
+          newMode = data['editor_mode'];
+        }
+    }).fail(_.noop)
+      .always(function () {
+        ace.edit(editor).session.setMode(newMode);
+    });
+  },
+
   initializeFileTree: function () {
     $('#files').jstree($('#files').data('entries'));
     $('#files').on('click', 'li.jstree-leaf', function (event) {
@@ -296,8 +323,8 @@ configureEditors: function () {
 
   handleSideBarToggle: function() {
     $('#sidebar').toggleClass('sidebar-col').toggleClass('sidebar-col-collapsed');
-    $('#sidebar-collapsed').toggleClass('hidden');
-    $('#sidebar-uncollapsed').toggleClass('hidden');
+    $('#sidebar-collapsed').toggleClass('d-none');
+    $('#sidebar-uncollapsed').toggleClass('d-none');
   },
 
   initializeRegexes: function () {
@@ -369,17 +396,17 @@ configureEditors: function () {
     return Modernizr.websockets;
   },
 
-  populatePanel: function (panel, result, index) {
-    panel.removeClass('panel-default').addClass(this.getPanelClass(result));
-    panel.find('.panel-title .filename').text(result.filename);
-    panel.find('.panel-title .number').text(index + 1);
-    panel.find('.row .col-sm-9').eq(0).find('.number').eq(0).text(result.passed);
-    panel.find('.row .col-sm-9').eq(0).find('.number').eq(1).text(result.count);
-    panel.find('.row .col-sm-9').eq(1).find('.number').eq(0).text(parseFloat((result.score * result.weight).toFixed(2)));
-    panel.find('.row .col-sm-9').eq(1).find('.number').eq(1).text(result.weight);
-    panel.find('.row .col-sm-9').eq(2).html(result.message);
-    if (result.error_messages) panel.find('.row .col-sm-9').eq(3).text(result.error_messages.join(' '));
-    //panel.find('.row .col-sm-9').eq(4).find('a').attr('href', '#output-' + index);
+  populateCard: function (card, result, index) {
+    card.addClass(this.getCardClass(result));
+    card.find('.card-title .filename').text(result.filename);
+    card.find('.card-title .number').text(index + 1);
+    card.find('.row .col-sm-9').eq(0).find('.number').eq(0).text(result.passed);
+    card.find('.row .col-sm-9').eq(0).find('.number').eq(1).text(result.count);
+    card.find('.row .col-sm-9').eq(1).find('.number').eq(0).text(parseFloat((result.score * result.weight).toFixed(2)));
+    card.find('.row .col-sm-9').eq(1).find('.number').eq(1).text(result.weight);
+    card.find('.row .col-sm-9').eq(2).html(result.message);
+    if (result.error_messages) card.find('.row .col-sm-9').eq(3).text(result.error_messages.join(' '));
+    //card.find('.row .col-sm-9').eq(4).find('a').attr('href', '#output-' + index);
   },
 
   publishCodeOceanEvent: function (payload) {
@@ -556,14 +583,14 @@ configureEditors: function () {
   },
 
   showOutputBar: function() {
-    $('#output_sidebar_collapsed').addClass('hidden');
-    $('#output_sidebar_uncollapsed').removeClass('hidden');
+    $('#output_sidebar_collapsed').addClass('d-none');
+    $('#output_sidebar_uncollapsed').removeClass('d-none');
     $('#output_sidebar').removeClass('output-col-collapsed').addClass('output-col');
   },
 
   hideOutputBar: function() {
-    $('#output_sidebar_collapsed').removeClass('hidden');
-    $('#output_sidebar_uncollapsed').addClass('hidden');
+    $('#output_sidebar_collapsed').removeClass('d-none');
+    $('#output_sidebar_uncollapsed').addClass('d-none');
     $('#output_sidebar').removeClass('output-col').addClass('output-col-collapsed');
   },
 
@@ -572,12 +599,12 @@ configureEditors: function () {
   },
 
   initializeDescriptionToggle: function() {
-    $('#exercise-headline').on('click', this.toggleDescriptionPanel.bind(this));
-    $('a#toggle').on('click', this.toggleDescriptionPanel.bind(this));
+    $('#exercise-headline').on('click', this.toggleDescriptionCard.bind(this));
+    $('a#toggle').on('click', this.toggleDescriptionCard.bind(this));
   },
 
-  toggleDescriptionPanel: function() {
-    $('#description-panel').toggleClass('description-panel-collapsed').toggleClass('description-panel');
+  toggleDescriptionCard: function() {
+    $('#description-card').toggleClass('description-card-collapsed').toggleClass('description-card');
     $('#description-symbol').toggleClass('fa-chevron-down').toggleClass('fa-chevron-right');
     var toggle = $('a#toggle');
     toggle.text(toggle.text() == toggle.data('hide') ? toggle.data('show') : toggle.data('hide'));

app/assets/javascripts/editor/evaluation.js

@@ -9,7 +9,7 @@ CodeOceanEditorEvaluation = {
     this.clearScoringOutput();
     this.createSubmission('#assess', null, function (response) {
       this.showSpinner($('#assess'));
-      $('#score_div').removeClass('hidden');
+      $('#score_div').removeClass('d-none');
       var url = response.score_url;
       this.initializeSocketForScoring(url);
     }.bind(this));
@@ -26,9 +26,9 @@ CodeOceanEditorEvaluation = {
 
   printScoringResult: function (result, index) {
     $('#results').show();
-    var panel = $('#dummies').children().first().clone();
-    this.populatePanel(panel, result, index);
-    $('#results ul').first().append(panel);
+    var card = $('#dummies').children().first().clone();
+    this.populateCard(card, result, index);
+    $('#results ul').first().append(card);
   },
 
   printScoringResults: function (response) {
@@ -60,7 +60,7 @@ CodeOceanEditorEvaluation = {
   renderHint: function (object) {
     var hint = object.data || object.hint;
     if (hint) {
-      $('#hint .panel-body').text(hint);
+      $('#hint .card-body').text(hint);
       $('#hint').fadeIn();
     }
   },

app/assets/javascripts/editor/participantsupport.js

@@ -1,12 +1,12 @@
 CodeOceanEditorFlowr = {
   isFlowrEnabled: true,
-  flowrResultHtml: '<div class="panel panel-default"><div id="{{headingId}}" role="tab" class="panel-heading"><h4 class="panel-title"><a data-toggle="collapse" data-parent="#flowrHint" href="#{{collapseId}}" aria-expanded="true" aria-controls="{{collapseId}}"></a></h4></div><div id="{{collapseId}}" role="tabpanel" aria-labelledby="{{headingId}}" class="panel-collapse collapse"><div class="panel-body"></div></div></div>',
+  flowrResultHtml: '<div class="panel panel-default"><div id="{{headingId}}" role="tab" class="panel-heading"><h4 class="panel-title"><a data-toggle="collapse" data-parent="#flowrHint" href="#{{collapseId}}" aria-expanded="true" aria-controls="{{collapseId}}"></a></h4></div><div id="{{collapseId}}" role="tabpanel" aria-labelledby="{{headingId}}" class="panel-collapse collapse"><div class="card-body"></div></div></div>',
 
   handleStderrOutputForFlowr: function () {
     if (!this.isFlowrEnabled) return;
 
     var flowrUrl = $('#flowrHint').data('url');
-    var flowrHintBody = $('#flowrHint .panel-body');
+    var flowrHintBody = $('#flowrHint .card-body');
     var queryParameters = {
       query: this.flowrOutputBuffer
     };
@@ -19,8 +19,8 @@ CodeOceanEditorFlowr = {
         var resultTile = $(collapsibleTileHtml);
 
         resultTile.find('h4 > a').text(question.title + ' | Found via ' + question.source);
-        resultTile.find('.panel-body').html(question.body);
-        resultTile.find('.panel-body').append('<a href="' + question.url + '" class="btn btn-primary btn-block">Open this question</a>');
+        resultTile.find('.card-body').html(question.body);
+        resultTile.find('.card-body').append('<a href="' + question.url + '" class="btn btn-primary btn-block">Open this question</a>');
 
         flowrHintBody.append(resultTile);
       });

app/assets/javascripts/editor/prompt.js

@@ -2,19 +2,19 @@ CodeOceanEditorPrompt = {
     prompt: '#prompt',
 
     showPrompt: function(msg) {
-        var label = $('#prompt .input-group-addon');
+        var label = $('#prompt .input-group-text');
         var prompt = $(this.prompt);
         label.text(msg.data || label.data('prompt'));
-        if (prompt.isPresent() && prompt.hasClass('hidden')) {
-            prompt.removeClass('hidden');
+        if (prompt.isPresent() && prompt.hasClass('d-none')) {
+            prompt.removeClass('d-none');
         }
         $('#prompt input').focus();
     },
 
     hidePrompt: function() {
         var prompt = $(this.prompt);
-        if (prompt.isPresent() && !prompt.hasClass('hidden')) {
-            prompt.addClass('hidden');
+        if (prompt.isPresent() && !prompt.hasClass('d-none')) {
+            prompt.addClass('d-none');
         }
     },
 

app/assets/javascripts/editor/submissions.js

@@ -155,7 +155,7 @@ CodeOceanEditorSubmissions = {
     $('#stop').data('url', submission.stop_url);
     this.running = true;
     this.showSpinner($('#run'));
-    $('#score_div').addClass('hidden');
+    $('#score_div').addClass('d-none');
     this.toggleButtonStates();
     var url = submission.run_url.replace(this.FILENAME_URL_PLACEHOLDER, this.active_file.filename.replace(/#$/,'')); // remove # if it is the last character, this is not part of the filename and just an anchor
     this.initializeSocketForRunning(url);
@@ -175,7 +175,7 @@ CodeOceanEditorSubmissions = {
     if ($('#test').is(':visible')) {
       this.createSubmission('#test', null, function(response) {
         this.showSpinner($('#test'));
-        $('#score_div').addClass('hidden');
+        $('#score_div').addClass('d-none');
         var url = response.test_url.replace(this.FILENAME_URL_PLACEHOLDER, this.active_file.filename.replace(/#$/,'')); // remove # if it is the last character, this is not part of the filename and just an anchor
         this.initializeSocketForTesting(url);
       }.bind(this));

app/assets/javascripts/editor/turtle.js

@@ -38,10 +38,10 @@ CodeOceanEditorTurtle = {
 
   showCanvas: function () {
     if ($('#turtlediv').isPresent()
-        && this.turtlecanvas.hasClass('hidden')) {
+        && this.turtlecanvas.hasClass('d-none')) {
       // initialize two-column layout
       $('#output-col1').addClass('col-lg-7 col-md-7 two-column');
-      this.turtlecanvas.removeClass('hidden');
+      this.turtlecanvas.removeClass('d-none');
     }
   }
 

app/assets/javascripts/exercises.js.erb

@@ -66,10 +66,9 @@ $(document).on('turbolinks:load', function() {
     $('#files').append(html);
     $('#files li:last select[name*="file_type_id"]').val(getSelectedExecutionEnvironment().file_type_id);
     $('#files li:last select').chosen(window.CodeOcean.CHOSEN_OPTIONS);
+    $('#files li:last select').remove();
+    $('#files li:last>div:last').removeClass('in').addClass('show')
     $('body, html').scrollTo('#add-file');
-    // if we collapse the file forms by default, we need to click on the new element in order to open it.
-    // however, this crashes for more files (if we add several ones by clicking the add button more often), since the elements are probably not correctly added to the files list.
-    //$('#files li:last>div:first>a>div').click();
 
     // initialize the ace editor for the new textarea.
     // pass the correct index and the last ace editor under the node files. this is the last one, since we just added it.
@@ -93,7 +92,7 @@ $(document).on('turbolinks:load', function() {
 
   var deleteFile = function(event) {
     event.preventDefault();
-    var fileUrl = $(this).data('file-url');
+    var fileUrl = $(event.target).data('file-url');
 
     if (confirm('<%= I18n.t('shared.confirm_destroy') %>')) {
       var jqxhr = $.ajax({
@@ -139,9 +138,9 @@ $(document).on('turbolinks:load', function() {
   var enableBatchUpdate = function() {
     $('thead .batch a').on('click', function(event) {
       event.preventDefault();
-      if (!$(this).data('toggled')) {
-        $(this).data('toggled', true);
-        $(this).text($(this).data('text'));
+      if (!$(event.target).data('toggled')) {
+        $(event.target).data('toggled', true);
+        $(event.target).text($(event.target).data('text'));
         buildCheckboxes();
       } else {
         performBatchUpdate();
@@ -199,7 +198,7 @@ $(document).on('turbolinks:load', function() {
   var observeFileRoleChanges = function() {
     $(document).on('change', 'select[name$="[role]"]', function() {
       var is_test_file = $(this).val() === 'teacher_defined_test';
-      var parent = $(this).parents('.panel');
+      var parent = $(this).parents('.card');
       var fields = parent.find('.test-related-fields');
       if (is_test_file) {
         fields.slideDown();
@@ -262,17 +261,13 @@ $(document).on('turbolinks:load', function() {
       jqxhr.fail(ajaxError);
   }
 
-  if ($.isController('exercises')) {
+  if ($.isController('exercises') || $.isController('submissions')) {
       // ignore tags table since it is in the dom before other tables
     if ($('table:not(#tags-table)').isPresent()) {
       enableBatchUpdate();
     } else if ($('.edit_exercise, .new_exercise').isPresent()) {
       execution_environments = $('form').data('execution-environments');
       file_types = $('form').data('file-types');
-      // new MarkdownEditor('#exercise_instructions');
-      // new MarkdownEditor('#exercise_description')
-      // todo: add an ace editor for each file
-      new PagedownEditor('#exercise_description');
 
       enableInlineFileCreation();
       inferFileAttributes();

app/assets/javascripts/forms.js

@@ -14,11 +14,11 @@ $(document).on('turbolinks:load', function() {
       var alternative_input = parent.find('.alternative-input');
 
       if (alternative_input.attr('disabled')) {
-        $(this).text($(this).data('text-toggled'));
+        $(this).text($(event.target).data('text-toggled'));
         original_input.attr('disabled', true).hide();
         alternative_input.attr('disabled', false).show();
       } else {
-        $(this).text($(this).data('text-initial'));
+        $(this).text($(event.target).data('text-initial'));
         alternative_input.attr('disabled', true).hide();
         original_input.attr('disabled', false).show();
       }
@@ -26,5 +26,27 @@ $(document).on('turbolinks:load', function() {
   });
 
   window.CodeOcean.CHOSEN_OPTIONS = CHOSEN_OPTIONS;
-  $('select:visible').chosen(CHOSEN_OPTIONS);
+  chosen_inputs = $('select').filter(function(){
+    return !$(this).parents('ul').is('#dummies');
+  });
+
+  // enable chosen hook when editing an exercise to update ace code highlighting
+  if ($.isController('exercises') && $('.edit_exercise, .new_exercise').isPresent()) {
+      chosen_inputs.filter(function(){
+          return $(this).attr('id').includes('file_type_id');
+      }).on('change chosen:ready', function(event, parameter) {
+          // Set ACE editor mode (for code highlighting) on change of file type and after initialization
+          editorInstance = $(event.target).closest('.card-body').find('.editor')[0];
+          selectedFileType = event.target.value;
+          CodeOceanEditor.updateEditorModeToFileTypeID(editorInstance, selectedFileType);
+      })
+  }
+
+  chosen_inputs.chosen(CHOSEN_OPTIONS);
+});
+
+// Remove some elements before going back to an older site. Otherwise, they might not work.
+$(document).on('turbolinks:before-cache', function() {
+    $('.chosen-container').remove();
+    $('#wmd-button-row-description').remove();
 });

app/assets/javascripts/markdown_ace_editor.js

@@ -9,7 +9,7 @@
         });
         editor.setShowPrintMargin(false);
         var session = editor.getSession();
-        session.setMode('markdown');
+        session.setMode('ace/mode/markdown');
         session.setUseWrapMode(true);
         session.setValue($(selector).val());
     };

app/assets/javascripts/pagedown.js

@@ -1,10 +0,0 @@
-(function() {
-    var ACE_FILES_PATH = '/assets/ace/';
-
-    window.PagedownEditor = function(selector) {
-        var converter = Markdown.getSanitizingConverter();
-        var editor    = new Markdown.Editor( converter );
-
-        editor.run();
-    };
-})();

app/assets/javascripts/pagedown/pagedown.js.erb

@@ -0,0 +1,43 @@
+//= require markdown.converter
+//  markdown.editor is slightly adjusted to work with Bootstrap 4.
+//  Taken from https://github.com/hughevans/pagedown-bootstrap-rails, V2.1.4
+//= require markdown.editor
+//= require markdown.sanitizer
+//= require markdown.extra
+
+renderPagedown = function() {
+    $(".wmd-output").each(function (i) {
+        const converter = new Markdown.Converter();
+        const content = $(this).html();
+        return $(this).html(converter.makeHtml(content));
+    })
+};
+
+createPagedownEditor = function( selector, context ) {
+    if (context == null) { context = 'body'; }
+    return $(selector, context).each(function(i, input) {
+        if ($(input).data('is_rendered')) {
+            return;
+        }
+        const attr = $(input).attr('id').split('wmd-input')[1];
+        const converter = new Markdown.Converter();
+        Markdown.Extra.init(converter);
+        const help = {
+            handler() {
+                window.open('http://daringfireball.net/projects/markdown/syntax');
+                return false;
+            },
+            title: "<%= I18n.t('components.markdown_editor.help', default: 'Markdown Editing Help') %>"
+        };
+
+        const editor = new Markdown.Editor(converter, attr, help);
+        editor.run();
+        $('[data-toggle="tooltip"]').tooltip();
+        return $(input).data('is_rendered', true);
+    });
+};
+
+$(document).on('turbolinks:load', function() {
+    renderPagedown();
+    return createPagedownEditor('.wmd-input');
+});

app/assets/javascripts/sortable.js

@@ -1,4 +1,4 @@
-$(document).ready(function(){
+$(document).on('turbolinks:load', function(){
   (function vendorTableSorter(){
     /*
       SortTable

app/assets/javascripts/statistics_activity_history.js

@@ -49,7 +49,7 @@ $(document).on('turbolinks:load', function() {
 
       var refreshData = function (callback) {
         var params = new URLSearchParams(window.location.search.slice(1));
-        var jqxhr = $.ajax(prefix + '-activity-history.json', {
+        var jqxhr = $.ajax('/statistics/graphs/' + prefix + '-activity-history.json', {
           dataType: 'json',
           data: {from: params.get('from'), to: params.get('to'), interval: params.get('interval')},
           method: 'GET'

app/assets/javascripts/statistics_graphs.js

@@ -101,7 +101,7 @@ $(document).on('turbolinks:load', function() {
       });
     }
 
-    manageGraph('user-activity', 'graphs/user-activity', 10);
-    manageGraph('rfc-activity', 'graphs/rfc-activity', 30);
+    manageGraph('user-activity', '/statistics/graphs/user-activity', 10);
+    manageGraph('rfc-activity', '/statistics/graphs/rfc-activity', 30);
   }
 });

app/assets/javascripts/submission_statistics.js

@@ -5,30 +5,40 @@ $(document).on('turbolinks:load', function() {
 
   var currentSubmission = 0;
   var active_file = undefined;
-  var fileTrees = []
+  var fileTrees = [];
   var editor = undefined;
-  var fileTypeById = {}
+  var fileTypeById = {};
 
   var showActiveFile = function() {
     var session = editor.getSession();
-    var fileType = fileTypeById[active_file.file_type_id]
+    var fileType = fileTypeById[active_file.file_type_id];
     session.setMode(fileType.editor_mode);
     session.setTabSize(fileType.indent_size);
     session.setValue(active_file.content);
     session.setUseSoftTabs(true);
     session.setUseWrapMode(true);
 
-    showFileTree(currentSubmission);
-    filetree = $(fileTrees[currentSubmission])
+    // The event ready.jstree is fired too early and thus doesn't work.
+    var selectFileInJsTree = function() {
+      if (!filetree.hasClass('jstree-loading')) {
         filetree.jstree("deselect_all");
         filetree.jstree().select_node(active_file.file_id);
+      } else {
+        setTimeout(selectFileInJsTree, 250);
+      }
+    };
+
+    filetree = $(fileTrees[currentSubmission]);
+    selectFileInJsTree();
+    // Finally change jstree element to prevent flickering
+    showFileTree(currentSubmission);
   };
 
   var initializeFileTree = function() {
     $('.files').each(function(index, element) {
       fileTree = $(element).jstree($(element).data('entries'));
       fileTree.on('click', 'li.jstree-leaf', function() {
-        var id = parseInt($(this).attr('id'))
+        var id = parseInt($(this).attr('id'));
         _.each(files[currentSubmission], function(file) {
           if (file.file_id === id) {
             active_file = file;
@@ -42,8 +52,8 @@ $(document).on('turbolinks:load', function() {
 
   var showFileTree = function(index) {
     $('.files').hide();
-    $(fileTrees[index].context).show();
-  }
+    $(fileTrees[index]).show();
+  };
 
   if ($.isController('exercises') && $('#timeline').isPresent()) {
 
@@ -85,7 +95,7 @@ $(document).on('turbolinks:load', function() {
         if (file.name === active_file.name) {
           fileIndex = index;
         }
-      })
+      });
       active_file = currentFiles[fileIndex];
       showActiveFile();
     });
@@ -94,10 +104,10 @@ $(document).on('turbolinks:load', function() {
       clearInterval(playInterval);
       playInterval = undefined;
       playButton.find('span.fa').removeClass('fa-pause').addClass('fa-play')
-    }
+    };
 
     playButton.on('click', function(event) {
-      if (playInterval == undefined) {
+      if (playInterval === undefined) {
         playInterval = setInterval(function() {
           if ($.isController('exercises') && $('#timeline').isPresent() && slider.val() < submissions.length - 1) {
             slider.val(parseInt(slider.val()) + 1);
@@ -112,7 +122,7 @@ $(document).on('turbolinks:load', function() {
       }
     });
 
-    active_file = files[0][0]
+    active_file = files[0][0];
     initializeFileTree();
     showActiveFile();
   }

app/assets/stylesheets/base.css.scss

@@ -28,6 +28,7 @@ span.caret {
   .progress-bar {
     line-height: initial;
     min-width: 2em;
+    color: white;
   }
 }
 
@@ -35,7 +36,7 @@ span.caret {
   margin-top: 0.5em;
 }
 
-.badge {
+.badge-pill {
   font-size: 100%;
 }
 

app/assets/stylesheets/bootstrap-dropdown-submenu.css.scss

@@ -3,10 +3,14 @@
 }
 
 .dropdown-submenu > .dropdown-menu {
-  top: 0;
+  top: -0.2em;
   left: 100%;
 }
 
+.dropdown-submenu.open > ul.dropdown-menu  {
+  display: block;
+}
+
 .dropdown-submenu > a:after {
   display: block;
   content: " ";
@@ -25,11 +29,11 @@
   border-left-color: #ffffff;
 }
 
-.dropdown-submenu.pull-left {
+.dropdown-submenu.float-left {
   float: none;
 }
 
-.dropdown-submenu.pull-left > .dropdown-menu {
+.dropdown-submenu.float-left > .dropdown-menu {
   left: -100%;
   margin-left: 10px;
   -webkit-border-radius: 6px 0 6px 6px;

app/assets/stylesheets/editor.css.scss

@@ -144,7 +144,8 @@ button i.fa-spin {
   min-height: 1px;
   padding-left: 15px;
   padding-right: 15px;
-  box-sizing: border-box
+  box-sizing: border-box;
+  margin-left: auto;
 }
 
 .output-col-collapsed {
@@ -155,7 +156,8 @@ button i.fa-spin {
   min-height: 1px;
   padding-left: 15px;
   padding-right: 15px;
-  box-sizing: border-box
+  box-sizing: border-box;
+  margin-left: auto;
 }
 
 .enforce-top-margin {
@@ -166,14 +168,14 @@ button i.fa-spin {
   margin-right: 10px !important;
 }
 
-.description-panel-collapsed {
+.description-card-collapsed {
   -webkit-transition: width 2s;
   transition: width 2s;
   height: 0px;
   visibility: hidden;
 }
 
-.description-panel {
+.description-card {
   height: auto;
   -webkit-transition: height 2s;
   transition: height 2s;

app/assets/stylesheets/exercise_collections.scss

@@ -57,10 +57,6 @@ rect.value-bar {
   }
 }
 
-.table-responsive#exercise-list {
-  max-height: 512px;
-}
-
 .exercise-id-tooltip {
   position: absolute;
   display: none;

app/assets/stylesheets/exercises.css.scss

@@ -35,11 +35,19 @@ input[type='file'] {
     margin: 10px 0 10px 0;
   }
 
-  .lead.description-panel-collapsed {
+  .lead.description-card-collapsed {
     margin: 0;
   }
 }
 
+[data-toggle="collapse"] .fa:before {
+  content: "\f139";
+}
+
+[data-toggle="collapse"].collapsed .fa:before {
+  content: "\f13a";
+}
+
 // Graph Settings
 
 .axis path {

app/assets/stylesheets/request-for-comments.css.scss

@@ -127,7 +127,7 @@
   background-color:#f9f9f9
 }
 
-.ace_tooltip {
+:not(.allow_ace_tooltip) > .ace_tooltip {
   display: none !important;
 }
 

app/assets/stylesheets/statistics.css.scss

@@ -76,8 +76,8 @@ tr.highlight {
   grid-gap: 10px;
 
   > a {
-    color: #fff;
-    text-decoration: none;
+    color: #fff !important;
+    text-decoration: none !important;
 
     > div {
       border: 2px solid #0055ba;

app/controllers/file_types_controller.rb

@@ -38,7 +38,7 @@ class FileTypesController < ApplicationController
   end
 
   def set_editor_modes
-    @editor_modes = Dir.glob('vendor/assets/javascripts/ace/mode-*.js').map do |filename|
+    @editor_modes = Dir.glob('vendor/assets/javascripts/ace/mode-*.js').sort.map do |filename|
       name = filename.gsub(/\w+\/|mode-|.js$/, '')
       [name, "ace/mode/#{name}"]
     end

app/helpers/pagedown_form_builder.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+class PagedownFormBuilder < ActionView::Helpers::FormBuilder
+  def pagedown(method, args)
+    # Adopt simple form builder to work with form_for
+    @attribute_name = method
+    @input_html_options = args[:input_html]
+
+    @template.capture do
+      @template.concat wmd_button_bar
+      @template.concat wmd_textarea
+      @template.concat wmd_preview if show_wmd_preview?
+    end
+  end
+
+  private
+
+  def wmd_button_bar
+    @template.content_tag :div, nil, id: "wmd-button-bar-#{base_id}"
+  end
+
+  def wmd_textarea
+    @template.text_area @object_name, @attribute_name,
+                       **@input_html_options,
+                       class: 'form-control wmd-input',
+                       id: "wmd-input-#{base_id}"
+  end
+
+  def wmd_preview
+    @template.content_tag :div, nil,
+                         class: 'wmd-preview',
+                         id: "wmd-preview-#{base_id}"
+  end
+
+  def show_wmd_preview?
+    @input_html_options[:preview].present?
+  end
+
+  def base_id
+    options[:pagedown_id_suffix] || @attribute_name
+  end
+end

app/models/error_template.rb

@@ -3,6 +3,6 @@ class ErrorTemplate < ApplicationRecord
   has_and_belongs_to_many :error_template_attributes
 
   def to_s
-    "#{id} [#{name}]"
+    name
   end
 end

app/models/error_template_attribute.rb

@@ -2,6 +2,6 @@ class ErrorTemplateAttribute < ApplicationRecord
   has_and_belongs_to_many :error_template
 
   def to_s
-    "#{id} [#{key}]"
+    key
   end
 end

app/views/application/_breadcrumbs.html.slim

@@ -3,17 +3,17 @@
     - if model = Kernel.const_get(controller_path.classify) rescue nil
       - object = model.find_by(id: params[:id])
       - if model.try(:nested_resource?)
-        li = model.model_name.human(count: 2)
+        li.breadcrumb-item = model.model_name.human(count: 2)
         - if object
-          li = object
+          li.breadcrumb-item = object
       - else
-        li = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
+        li.breadcrumb-item = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
         - if object
-          li = link_to(object, send(:"#{model.model_name.singular}_path", object))
-      li.active
+          li.breadcrumb-item = link_to(object, send(:"#{model.model_name.singular}_path", object))
+      li.breadcrumb-item.active
         - if I18n.translation_present?("shared.#{params[:action]}")
           = t("shared.#{params[:action]}")
         - else
           = t("#{controller_name}.index.#{params[:action]}")
     - else
-      li.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")
+      li.breadcrumb-item.active = t("breadcrumbs.#{controller_name}.#{params[:action]}")

app/views/application/_flash.html.slim

@@ -1,6 +1,7 @@
 #flash-container
   #flash.container.fixed_error_messages data-message-failure=t('shared.message_failure')
     - %w[alert danger info notice success warning].each do |severity|
-      div.alert.flash class="alert-#{{'alert' => 'warning', 'notice' => 'success'}.fetch(severity, severity)}"
-        p id="flash-#{severity}" = flash[severity]
-        span.fa.fa-times
+      div.alert.flash class="alert-#{{'alert' => 'warning', 'notice' => 'success'}.fetch(severity, severity)} alert-dismissible fade show"
+        p.mb-0 id="flash-#{severity}" = flash[severity]
+        button type="button" class="close" data-dismiss="alert" aria-label="Close"
+          span.text-white aria-hidden="true" ×

app/views/application/_locale_selector.html.slim

@@ -1,7 +1,7 @@
-li.dropdown
-  a.dropdown-toggle data-toggle='dropdown' href='#'
+li.nav-item.dropdown
+  a.nav-link.dropdown-toggle.mx-3 data-toggle='dropdown' href='#'
     = t("locales.#{I18n.locale}")
     span.caret
-  ul.dropdown-menu role='menu'
+  ul.dropdown-menu.p-0.mt-1 role='menu'
     - I18n.available_locales.sort_by { |locale| t("locales.#{locale}") }.each do |locale|
-      li = link_to(t("locales.#{locale}"), url_for(params.permit!.merge(locale: locale)))
+      li = link_to(t("locales.#{locale}"), url_for(params.permit!.merge(locale: locale)), class: 'dropdown-item')

app/views/application/_navigation.html.slim

@@ -1,14 +1,14 @@
 - if current_user.try(:internal_user?)
   ul.nav.navbar-nav
-    li.dropdown
-      a.dropdown-toggle data-toggle='dropdown' href='#'
+    li.nav-item.dropdown
+      a.nav-link.dropdown-toggle.mx-3 data-toggle='dropdown' href='#'
         = t('shared.administration')
         span.caret
-      ul.dropdown-menu role='menu'
+      ul.dropdown-menu.p-0.mt-1 role='menu'
         - if current_user.admin?
-          li = link_to(t('breadcrumbs.dashboard.show'), admin_dashboard_path, 'data-turbolinks' => "false")
-          li = link_to(t('breadcrumbs.statistics.show'), statistics_path)
-          li.divider
+          li = link_to(t('breadcrumbs.dashboard.show'), admin_dashboard_path, class: 'dropdown-item', 'data-turbolinks' => "false")
+          li = link_to(t('breadcrumbs.statistics.show'), statistics_path, class: 'dropdown-item')
+          li.dropdown-divider role='separator'
         = render('navigation_submenu', title: t('activerecord.models.exercise.other'),
                 models: [Exercise, ExerciseCollection, ProxyExercise, Tag, Submission], link: exercises_path, cached: true)
         = render('navigation_submenu', title: t('navigation.sections.users'), models: [InternalUser, ExternalUser],

app/views/application/_navigation_collection_link.html.slim

@@ -1,2 +1,2 @@
 - if policy(model).index?
-  li = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"))
+  li = link_to(model.model_name.human(count: 2), send(:"#{model.model_name.collection}_path"), class: 'dropdown-item')

app/views/application/_navigation_submenu.html.slim

@@ -1,6 +1,6 @@
-li.dropdown.dropdown-submenu
+li.dropdown-submenu
   - link = link.nil? ? "#" : link
-  a href=link class="dropdown-toggle" data-toggle="dropdown" = title
-  ul class="dropdown-menu"
+  a.dropdown-item.dropdown-toggle href=link data-toggle="dropdown" = title
+  ul.dropdown-menu.p-0
     - models.each do |model|
       = render('navigation_collection_link', model: model, cached: true)

app/views/application/_session.html.slim

@@ -1,19 +1,19 @@
 - if current_user
-  li.dropdown
-    a.dropdown-toggle data-toggle='dropdown' href='#'
+  li.nav-item.dropdown
+    a.nav-link.dropdown-toggle data-toggle='dropdown' href='#'
       i.fa.fa-user
       = current_user
       span.caret
-    ul.dropdown-menu role='menu'
+    ul.dropdown-menu.p-0.mt-1 role='menu'
       - if current_user.internal_user?
-        li = link_to(t('consumers.show.link'), current_user.consumer) if current_user.consumer
-        li = link_to(t('internal_users.show.link'), current_user)
-        li = link_to(t('request_for_comments.index.all'), request_for_comments_path)
-        li = link_to(t('request_for_comments.index.get_my_rfc_activity'), my_rfc_activity_path)
-      li = link_to(t('request_for_comments.index.get_my_comment_requests'), my_request_for_comments_path)
+        li = link_to(t('consumers.show.link'), current_user.consumer, class: 'dropdown-item') if current_user.consumer
+        li = link_to(t('internal_users.show.link'), current_user, class: 'dropdown-item')
+        li = link_to(t('request_for_comments.index.all'), request_for_comments_path, class: 'dropdown-item')
+        li = link_to(t('request_for_comments.index.get_my_rfc_activity'), my_rfc_activity_path, class: 'dropdown-item')
+      li = link_to(t('request_for_comments.index.get_my_comment_requests'), my_request_for_comments_path, class: 'dropdown-item')
       - if current_user.internal_user?
-        li = link_to(t('sessions.destroy.link'), sign_out_path, method: :delete)
+        li = link_to(t('sessions.destroy.link'), sign_out_path, method: :delete, class: 'dropdown-item')
 - else
-  li = link_to(sign_in_path) do
+  li.nav-item = link_to(sign_in_path, class: 'nav-link') do
     i.fa.fa-sign-in
     = t('sessions.new.link')

app/views/code_harbor_links/index.html.slim

@@ -9,7 +9,7 @@ h1 = CodeHarborLink.model_name.human(count: 2)
     tbody
       - @code_harbor_links.each do |code_harbor_link|
         tr
-          td = code_harbor_link.oauth2token
+          td = link_to(code_harbor_link.oauth2token, code_harbor_link)
           td = link_to(t('shared.show'), code_harbor_link)
           td = link_to(t('shared.edit'), edit_code_harbor_link_path(code_harbor_link))
           td = link_to(t('shared.destroy'), code_harbor_link, data: {confirm: t('shared.confirm_destroy')}, method: :delete)

app/views/code_ocean/files/_form.html.slim

@@ -12,5 +12,5 @@
     = f.label(:file_template_id, t('activerecord.attributes.file.file_template_id'))
     = f.collection_select(:file_template_id, FileTemplate.all.order(:name), :id, :name, {:include_blank => true}, class: 'form-control')
   = f.hidden_field(:context_id)
-  .hidden#noTemplateLabel data-text=t('file_template.no_template_label')
+  .d-none#noTemplateLabel data-text=t('file_template.no_template_label')
   .actions = render('shared/submit_button', f: f, object: CodeOcean::File.new)

app/views/consumers/index.html.slim

@@ -9,7 +9,7 @@ h1 = Consumer.model_name.human(count: 2)
     tbody
       - @consumers.each do |consumer|
         tr
-          td = consumer.name
+          td = link_to(consumer.name, consumer)
           td = link_to(t('shared.show'), consumer)
           td = link_to(t('shared.edit'), edit_consumer_path(consumer))
           td = link_to(t('shared.destroy'), consumer, data: {confirm: t('shared.confirm_destroy')}, method: :delete)

app/views/error_template_attributes/_form.html.slim

@@ -9,8 +9,9 @@
   .form-group
     = f.label(:regex)
     = f.text_field(:regex, class: 'form-control', required: true)
-    .help-block == t('error_templates.hints.signature')
-  .form-group
-    = f.check_box(:important)
+    .help-block.form-text == t('error_templates.hints.signature')
+  .form-check.form-group
+    label.form-check-label
+    = f.check_box(:important, class: 'form-check-input')
     = t('activerecord.attributes.error_template_attribute.important')
   .actions = render('shared/submit_button', f: f, object: @error_template_attribute)

app/views/error_template_attributes/index.html.slim

@@ -17,9 +17,10 @@ h1 = ErrorTemplateAttribute.model_name.human(count: 2)
               span class="fa fa-star" aria-hidden="true"
             - else
               span class="fa fa-star-o" aria-hidden="true"
-          td = error_template_attribute.key
+          td = link_to(error_template_attribute.key, error_template_attribute)
           td = error_template_attribute.description
-          td = error_template_attribute.regex
+          td
+            code = error_template_attribute.regex
           td = link_to(t('shared.show'), error_template_attribute)
           td = link_to(t('shared.edit'), edit_error_template_attribute_path(error_template_attribute))
           td = link_to(t('shared.destroy'), error_template_attribute, data: {confirm: t('shared.confirm_destroy')}, method: :delete)

app/views/error_template_attributes/show.html.slim

@@ -2,7 +2,10 @@ h1
   = @error_template_attribute
   = render('shared/edit_button', object: @error_template_attribute)
 
-- [:key, :description, :regex, :important].each do |attribute|
+- [:key, :description].each do |attribute|
   = row(label: "error_template_attribute.#{attribute}", value: @error_template_attribute.send(attribute))
+= row(label: "error_template_attribute.key") do
+  code = @error_template_attribute.key
+= row(label: "error_template_attribute.important", value: @error_template_attribute.important)
 
 // todo: used by

app/views/error_templates/_form.html.slim

@@ -9,12 +9,12 @@
   .form-group
     = f.label(:signature)
     = f.text_field(:signature, class: 'form-control')
-    .help-block == t('error_templates.hints.signature')
+    .help-block.form-text == t('error_templates.hints.signature')
   .form-group
     = f.label(:description)
     = f.text_field(:description, class: 'form-control')
   .form-group
     = f.label(:hint)
     = f.text_field(:hint, class: 'form-control')
-    .help-block == t('error_templates.hints.hint_templates')
+    .help-block.form-text == t('error_templates.hints.hint_templates')
   .actions = render('shared/submit_button', f: f, object: @error_template)

app/views/error_templates/index.html.slim

@@ -11,7 +11,7 @@ h1 = ErrorTemplate.model_name.human(count: 2)
     tbody
       - @error_templates.each do |error_template|
         tr
-          td = error_template.name
+          td = link_to(error_template.name, error_template)
           td = error_template.description
           td = link_to(error_template.execution_environment)
           td = link_to(t('shared.show'), error_template)

app/views/error_templates/show.html.slim

@@ -4,10 +4,12 @@ h1
 
 = row(label: 'error_template.name', value: @error_template.name)
 = row(label: 'exercise.execution_environment', value: link_to(@error_template.execution_environment))
-- [:signature, :description, :hint].each do |attribute|
+= row(label: "error_template.signature") do
+  code = @error_template.signature
+- [:description, :hint].each do |attribute|
   = row(label: "error_template.#{attribute}", value: @error_template.send(attribute))
 
-h3
+h2.mt-4
   = t 'error_templates.attributes'
 
 .table-responsive
@@ -27,9 +29,10 @@ h3
               span class="fa fa-star" aria-hidden="true"
             - else
               span class="fa fa-star-o" aria-hidden="true"
-          td = attribute.key
+          td = link_to(attribute.key, attribute)
           td = attribute.description
-          td = attribute.regex
+          td
+            code = attribute.regex
           td = link_to(t('shared.show'), attribute)
           td = link_to(t('shared.destroy'), attribute_error_template_url(:error_template_attribute_id => attribute.id), :method => :delete)
 
@@ -37,4 +40,4 @@ h3
   = collection_select({}, :error_template_attribute_id,
           ErrorTemplateAttribute.where.not(id: @error_template.error_template_attributes.select(:id).to_a).order('important DESC', :key),
           :id, :key, {include_blank: false}, class: '')
-  button.btn.btn-default = t('error_templates.add_attribute')
+  button.btn.btn-outline-primary = t('error_templates.add_attribute')

app/views/execution_environments/_form.html.slim

@@ -12,17 +12,17 @@
     a.toggle-input data={text_initial: t('shared.new'), text_toggled: t('shared.back')} href='#' = t('shared.new')
     .original-input = f.select(:docker_image, @docker_images, {}, class: 'form-control')
     = f.text_field(:docker_image, class: 'alternative-input form-control', disabled: true)
-    .help-block == t('.hints.docker_image')
+    .help-block.form-text == t('.hints.docker_image')
   .form-group
     = f.label(:exposed_ports)
     = f.text_field(:exposed_ports, class: 'form-control', placeholder: '3000, 4000')
-    .help-block == t('.hints.exposed_ports')
+    .help-block.form-text == t('.hints.exposed_ports')
   .form-group
     = f.label(:memory_limit)
     = f.number_field(:memory_limit, class: 'form-control', min: DockerClient::MINIMUM_MEMORY_LIMIT, value: f.object.memory_limit || DockerClient::DEFAULT_MEMORY_LIMIT)
-  .checkbox
-    label
-      = f.check_box(:network_enabled)
+  .form-check.mb-3
+    label.form-check-label
+      = f.check_box(:network_enabled, class: 'form-check-input')
       = t('activerecord.attributes.execution_environment.network_enabled')
   .form-group
     = f.label(:permitted_execution_time)
@@ -33,11 +33,11 @@
   .form-group
     = f.label(:run_command)
     = f.text_field(:run_command, class: 'form-control', placeholder: 'command %{filename}', required: true)
-    .help-block == t('.hints.command')
+    .help-block.form-text == t('.hints.command')
   .form-group
     = f.label(:test_command)
     = f.text_field(:test_command, class: 'form-control', placeholder: 'command %{filename}')
-    .help-block == t('.hints.command')
+    .help-block.form-text == t('.hints.command')
   .form-group
     = f.label(:testing_framework)
     = f.select(:testing_framework, @testing_framework_adapters, {include_blank: true}, class: 'form-control')

app/views/execution_environments/index.html.slim

@@ -15,7 +15,7 @@ h1 = ExecutionEnvironment.model_name.human(count: 2)
     tbody
       - @execution_environments.each do |execution_environment|
         tr
-          td = execution_environment.name
+          td = link_to(execution_environment.name, execution_environment)
           td = link_to(execution_environment.author, execution_environment.author)
           td = execution_environment.pool_size
           td = execution_environment.memory_limit

app/views/execution_environments/show.html.slim

@@ -5,7 +5,10 @@ h1
 = row(label: 'execution_environment.name', value: @execution_environment.name)
 = row(label: 'execution_environment.user', value: link_to(@execution_environment.author, @execution_environment.author))
 = row(label: 'execution_environment.file_type', value: @execution_environment.file_type.present? ? link_to(@execution_environment.file_type, @execution_environment.file_type) : nil)
-- [:docker_image, :exposed_ports, :memory_limit, :network_enabled, :permitted_execution_time, :pool_size, :run_command, :test_command].each do |attribute|
+- [:docker_image, :exposed_ports, :memory_limit, :network_enabled, :permitted_execution_time, :pool_size].each do |attribute|
   = row(label: "execution_environment.#{attribute}", value: @execution_environment.send(attribute))
+- [:run_command, :test_command].each do |attribute|
+  = row(label: "execution_environment.#{attribute}") do
+    code = @execution_environment.send(attribute)
 = row(label: 'execution_environment.testing_framework', value: @testing_framework_adapter.try(:framework_name))
 = row(label: 'execution_environment.help', value: render_markdown(@execution_environment.help))

app/views/exercise_collections/_add_exercise_modal.slim

@@ -2,7 +2,8 @@
 
 form#exercise-selection
   .form-group
-    span.label = t('activerecord.attributes.exercise_collections.exercises')
+    span.badge = t('activerecord.attributes.exercise_collections.exercises')
+    .mb-2
     = collection_select({}, :exercise_ids, exercises, :id, :title, {}, {id: 'add-exercise-list', class: 'form-control', multiple: true})
 
 button.btn.btn-primary#add-exercises = t('exercise_collections.form.add_exercises')

app/views/exercise_collections/_form.html.slim

@@ -3,9 +3,10 @@
   .form-group
     = f.label(t('activerecord.attributes.exercise_collections.name'))
     = f.text_field(:name, class: 'form-control', required: true)
-  .form-group
-    = f.label(t('activerecord.attributes.exercise_collections.use_anomaly_detection'))
-    = f.check_box(:use_anomaly_detection, {class: 'form-control'})
+  .form-check.form-group
+    label.form-check-label
+      = f.check_box(:use_anomaly_detection, class: 'form-check-input')
+      = t('activerecord.attributes.exercise_collections.use_anomaly_detection')
   .form-group
     = f.label(t('activerecord.attributes.exercise_collections.user'))
     = f.collection_select(:user_id, InternalUser.order(:name), :id, :name, {}, {class: 'form-control'})
@@ -26,10 +27,10 @@
             td = link_to(t('shared.show'), item.exercise, 'data-turbolinks' => "false")
             td
               a.remove-exercise href='#' = t('shared.destroy')
-  .hidden
+  .d-none
     = f.collection_select(:exercise_ids, Exercise.all, :id, :title, {}, {id: 'exercise-select', class: 'form-control', multiple: true})
   .exercise-actions
-    button.btn.btn-primary type='button' data-toggle='modal' data-target='#add-exercise-modal' = t('exercise_collections.form.add_exercises')
+    button.btn.btn-outline-primary type='button' data-toggle='modal' data-target='#add-exercise-modal' = t('exercise_collections.form.add_exercises')
     button.btn.btn-secondary#sort-button type='button' = t('exercise_collections.form.sort_by_title')
 
   .actions = render('shared/submit_button', f: f, object: @exercise_collection)

app/views/exercise_collections/show.html.slim

@@ -7,7 +7,7 @@ h1
 = row(label: 'exercise_collections.use_anomaly_detection', value: @exercise_collection.use_anomaly_detection)
 = row(label: 'exercise_collections.updated_at', value: @exercise_collection.updated_at)
 
-h4 = t('activerecord.attributes.exercise_collections.exercises')
+h4.mt-4 = t('activerecord.attributes.exercise_collections.exercises')
 .table-responsive#exercise-list
   table.table
     thead
@@ -24,5 +24,5 @@ h4 = t('activerecord.attributes.exercise_collections.exercises')
           td = exercise_collection_item.position
           td = link_to(exercise.title, exercise)
           td = link_to_if(exercise.execution_environment && policy(exercise.execution_environment).show?, exercise.execution_environment, exercise.execution_environment)
-          td = exercise.user.name
+          td = link_to_if(exercise.user && policy(exercise.user).show?, exercise.user.name, exercise.user)
           td = link_to(t('shared.statistics'), statistics_exercise_path(exercise), 'data-turbolinks' => "false")

app/views/exercise_collections/statistics.html.slim

@@ -6,7 +6,7 @@ h1 = @exercise_collection
 = row(label: 'exercises.statistics.average_worktime', value: @exercise_collection.average_working_time.round(3).to_s + 's')
 
 #graph
-  #data.hidden(data-working-times=ActiveSupport::JSON.encode(@exercise_collection.collection_statistics) data-average-working-time=@exercise_collection.average_working_time)
+  #data.d-none(data-working-times=ActiveSupport::JSON.encode(@exercise_collection.collection_statistics) data-average-working-time=@exercise_collection.average_working_time)
   #legend
     - {time: t('exercises.statistics.average_worktime'),
         min: 'min. anomaly threshold',

app/views/exercises/_code_field.html.slim

@@ -3,5 +3,5 @@
   |  
   a.toggle-input data={text_initial: t('shared.upload_file'), text_toggled: t('shared.back')} href='#' = t('shared.upload_file')
   = form.text_area(attribute, class: 'code-field form-control', rows: 16, style: "display:none;")
-  = form.file_field(attribute, class: 'alternative-input form-control', disabled: true)
+  = form.file_field(attribute, class: 'alternative-input form-control-file', disabled: true)
   = render partial: 'editor_edit', locals: { exercise: @exercise }

app/views/exercises/_editor.html.slim

@@ -6,8 +6,7 @@
 - hide_rfc_button = @hide_rfc_button || false
 #editor.row data-exercise-id=@exercise.id data-message-depleted=t('exercises.editor.depleted') data-message-timeout=t('exercises.editor.timeout',  permitted_execution_time: @exercise.execution_environment.permitted_execution_time) data-errors-url=execution_environment_errors_path(exercise.execution_environment) data-submissions-url=submissions_path data-user-id=@current_user.id data-user-external-id=external_user_external_id data-working-times-url=working_times_exercise_path(@exercise) data-intervention-save-url=intervention_exercise_path(@exercise) data-rfc-interventions=show_rfc_interventions data-break-interventions=show_break_interventions data-course_token=@course_token data-search-save-url=search_exercise_path(@exercise)
   div id="sidebar" class=(@exercise.hide_file_tree ? 'sidebar-col-collapsed' : 'sidebar-col') = render('editor_file_tree', exercise: @exercise, files: @files)
-  div id='output_sidebar' class='output-col-collapsed' = render('exercises/editor_output', external_user_id: external_user_id, consumer_id: consumer_id )
-  div id='frames' class='editor-col'
+  div.editor-col.col.p-0 id='frames'
     #editor-buttons.btn-group.enforce-bottom-margin
       = render('editor_button', disabled: true, icon: 'fa fa-ban', id: 'dummy', label: t('exercises.editor.dummy'))
       = render('editor_button', icon: 'fa fa-desktop', id: 'render', label: t('exercises.editor.render'))
@@ -24,6 +23,7 @@
       = t('exercises.editor.lastsaved')
       span
       button style="display:none" id="autosave"
+  div id='output_sidebar' class='output-col-collapsed' = render('exercises/editor_output', external_user_id: external_user_id, consumer_id: consumer_id )
 
 
 = render('shared/modal', id: 'comment-modal', title: t('exercises.implement.comment.request'), template: 'exercises/_request_comment_dialogcontent')

app/views/exercises/_editor_button.html.slim

@@ -1,4 +1,4 @@
-button.btn class=local_assigns.fetch(:classes, 'btn-primary btn-sm') *local_assigns.fetch(:data, {}) disabled=local_assigns.fetch(:disabled, false) id=id title=local_assigns[:title] type='button'
+button.btn class=local_assigns.fetch(:classes, 'btn-primary btn-lg') *local_assigns.fetch(:data, {}) disabled=local_assigns.fetch(:disabled, false) id=id title=local_assigns[:title] type='button'
   i.fa.fa-circle-o-notch.fa-spin
-  i class=icon
+  i class=(label.present? ? icon : "#{icon} m-0")
   = label

app/views/exercises/_editor_edit.html.slim

@@ -1,5 +1,5 @@
-#editor-edit.panel-group.row.original-input data-exercise-id=@exercise.id
+#editor-edit.original-input data-exercise-id=@exercise.id
   #frames
     .edit-frame
-      .editor-content.hidden
-      .editor
+      .editor-content.d-none
+      .editor.allow_ace_tooltip

app/views/exercises/_editor_file_tree.html.slim

@@ -1,18 +1,18 @@
-div id='sidebar-collapsed' class=(@exercise.hide_file_tree ? '' : 'hidden')
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-plus-square', id: 'sidebar-collapse-collapsed', label:'', title:t('exercises.editor.expand_action_sidebar'))
+div id='sidebar-collapsed' class=(@exercise.hide_file_tree ? '' : 'd-none')
+  = render('editor_button', classes: 'btn-block btn-primary btn', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-plus-square', id: 'sidebar-collapse-collapsed', label:'', title:t('exercises.editor.expand_action_sidebar'))
 
   - if @exercise.allow_file_creation and not @exercise.hide_file_tree?
-    = render('editor_button', classes: 'btn-block btn-primary btn-sm enforce-top-margin', data: {:'data-cause' => 'file', :'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-plus', id: 'create-file-collapsed', label:'', title: t('exercises.editor.create_file'))
+    = render('editor_button', classes: 'btn-block btn-primary btn enforce-top-margin', data: {:'data-cause' => 'file', :'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-plus', id: 'create-file-collapsed', label:'', title: t('exercises.editor.create_file'))
 
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm enforce-top-margin', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-download', id: 'download-collapsed', label:'', title: t('exercises.editor.download'))
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm enforce-top-margin', data: {:'data-message-confirm' => t('exercises.editor.confirm_start_over'), :'data-url' => reload_exercise_path(@exercise), :'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-history', id: 'start-over-collapsed', label:'', title: t('exercises.editor.start_over'))
-  - if !@course_token.blank?
-    = render('editor_button', classes: 'btn-block btn-primary btn-sm enforce-top-margin', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-search', id: 'sidebar-search-collapsed', label: '', title: t('search.search_in_forum'))
+  = render('editor_button', classes: 'btn-block btn-primary btn enforce-top-margin', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-download', id: 'download-collapsed', label:'', title: t('exercises.editor.download'))
+  = render('editor_button', classes: 'btn-block btn-primary btn enforce-top-margin', data: {:'data-message-confirm' => t('exercises.editor.confirm_start_over'), :'data-url' => reload_exercise_path(@exercise), :'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-history', id: 'start-over-collapsed', label:'', title: t('exercises.editor.start_over'))
+  //- if !@course_token.blank?
+    = render('editor_button', classes: 'btn-block btn-primary btn enforce-top-margin', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'right'}, icon: 'fa fa-search', id: 'sidebar-search-collapsed', label: '', title: t('search.search_in_forum'))
 
-div id='sidebar-uncollapsed' class=(@exercise.hide_file_tree ? 'hidden' : '')
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm', icon: 'fa fa-minus-square', id: 'sidebar-collapse', label: t('exercises.editor.collapse_action_sidebar'))
+div id='sidebar-uncollapsed' class=(@exercise.hide_file_tree ? 'd-none' : '')
+  = render('editor_button', classes: 'btn-block btn-primary btn', icon: 'fa fa-minus-square', id: 'sidebar-collapse', label: t('exercises.editor.collapse_action_sidebar'))
 
-  div class=(@exercise.hide_file_tree ? 'hidden' : '')
+  div class=(@exercise.hide_file_tree ? 'd-none' : '')
     hr
 
     #files data-entries=FileTree.new(files).to_js_tree
@@ -20,11 +20,11 @@ div id='sidebar-uncollapsed' class=(@exercise.hide_file_tree ? 'hidden' : '')
     hr
 
   - if @exercise.allow_file_creation and not @exercise.hide_file_tree?
-    = render('editor_button', classes: 'btn-block btn-primary btn-sm', data: {:'data-cause' => 'file'}, icon: 'fa fa-plus', id: 'create-file', label: t('exercises.editor.create_file'))
-    = render('editor_button', classes: 'btn-block btn-warning btn-sm', data: {:'data-cause' => 'file', :'data-message-confirm' => t('shared.confirm_destroy')}, icon: 'fa fa-times', id: 'destroy-file', label: t('exercises.editor.destroy_file'))
+    = render('editor_button', classes: 'btn-block btn-primary btn', data: {:'data-cause' => 'file'}, icon: 'fa fa-plus', id: 'create-file', label: t('exercises.editor.create_file'))
+    = render('editor_button', classes: 'btn-block btn-warning btn', data: {:'data-cause' => 'file', :'data-message-confirm' => t('shared.confirm_destroy')}, icon: 'fa fa-times', id: 'destroy-file', label: t('exercises.editor.destroy_file'))
 
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm enforce-top-margin', icon: 'fa fa-download', id: 'download', label: t('exercises.editor.download'))
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm', data: {:'data-message-confirm' => t('exercises.editor.confirm_start_over'), :'data-url' => reload_exercise_path(@exercise)}, icon: 'fa fa-history', id: 'start-over', label: t('exercises.editor.start_over'))
+  = render('editor_button', classes: 'btn-block btn-primary btn enforce-top-margin', icon: 'fa fa-download', id: 'download', label: t('exercises.editor.download'))
+  = render('editor_button', classes: 'btn-block btn-primary btn', data: {:'data-message-confirm' => t('exercises.editor.confirm_start_over'), :'data-url' => reload_exercise_path(@exercise)}, icon: 'fa fa-history', id: 'start-over', label: t('exercises.editor.start_over'))
 
   //- if !@course_token.blank?
       .input-group.enforce-top-margin

app/views/exercises/_editor_frame.html.slim

@@ -11,5 +11,5 @@
       - else
         = link_to(file.native_file.file.name_with_extension, file.native_file.url)
   - else
-    .editor-content.hidden data-file-id=file.ancestor_id = file.content
+    .editor-content.d-none data-file-id=file.ancestor_id = file.content
     .editor data-file-id=file.ancestor_id data-indent-size=file.file_type.indent_size data-mode=file.file_type.editor_mode data-read-only=file.read_only data-allow-auto-completion=exercise.allow_auto_completion.to_s data-id=file.id

app/views/exercises/_editor_output.html.slim

@@ -1,19 +1,21 @@
 div id='output_sidebar_collapsed'
-  = render('editor_button', classes: 'btn-block btn-primary btn-sm', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'left'}, title: t('exercises.editor.expand_output_sidebar'), icon: 'fa fa-plus-square', id: 'toggle-sidebar-output-collapsed', label: '')
-div id='output_sidebar_uncollapsed' class='hidden col-sm-12 enforce-bottom-margin' data-message-no-output=t('exercises.implement.no_output')
+  = render('editor_button', classes: 'btn-block btn-primary btn', data: {:'data-toggle' => 'tooltip', :'data-placement' => 'left'}, title: t('exercises.editor.expand_output_sidebar'), icon: 'fa fa-plus-square', id: 'toggle-sidebar-output-collapsed', label: '')
+div.h-100 id='output_sidebar_uncollapsed' class='d-none col-sm-12 enforce-bottom-margin' data-message-no-output=t('exercises.implement.no_output')
   .row
-    = render('editor_button', classes: 'btn-block btn-primary btn-sm', icon: 'fa fa-minus-square', id: 'toggle-sidebar-output', label: t('exercises.editor.collapse_output_sidebar'))
+    = render('editor_button', classes: 'btn-block btn-primary btn', icon: 'fa fa-minus-square', id: 'toggle-sidebar-output', label: t('exercises.editor.collapse_output_sidebar'))
 
-  div.enforce-big-top-margin.hidden id='score_div'
+  div.position-absolute.d-flex.mb-1.w-100 style="overflow: scroll; left: 0; bottom: 0; height: calc(100% - 3rem);"
+    div.w-100
+      div.enforce-big-top-margin.d-none id='score_div'
         #results
           h2 = t('exercises.implement.results')
           p.test-count == t('exercises.implement.test_count', count: 0)
           ul.list-unstyled
-      ul#dummies.hidden.list-unstyled
-        li.panel.panel-default
-          .panel-heading
-            h3.panel-title == t('exercises.implement.file', filename: '', number: 0)
-          .panel-body
+          ul#dummies.d-none.list-unstyled
+            li.card.mt-2
+              .card-header
+                h3.card-title.m-0 == t('exercises.implement.file', filename: '', number: 0)
+              .card-body.bg-white.text-dark
                 = row(label: 'exercises.implement.passed_tests', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
                 = row(label: 'activerecord.attributes.submission.score', value: t('shared.out_of', maximum_value: 0, value: 0).html_safe)
                 = row(label: 'exercises.implement.feedback')
@@ -30,29 +32,30 @@ div id='output_sidebar_uncollapsed' class='hidden col-sm-12 enforce-bottom-margi
         - if lti_outcome_service?(@exercise.id, external_user_id, consumer_id)
           p.text-center = render('editor_button', classes: 'btn-lg btn-success', data: {:'data-url' => submit_exercise_path(@exercise)}, icon: 'fa fa-send', id: 'submit', label: t('exercises.editor.submit'))
         - else
-      p.text-center = render('editor_button', classes: 'btn-lg btn-warning-outline', data: {:'data-placement' => 'bottom', :'data-tooltip' => true}, icon: 'fa fa-clock-o', id: 'submit_outdated', label: t('exercises.editor.exercise_deadline_passed'), title: t('exercises.editor.tooltips.exercise_deadline_passed'))
+          p.text-center = render('editor_button', classes: 'btn-lg btn-outline-warning disabled', data: {:'data-placement' => 'bottom', :'data-tooltip' => true}, icon: 'fa fa-clock-o', id: 'submit_outdated', label: t('exercises.editor.exercise_deadline_passed'), title: t('exercises.editor.tooltips.exercise_deadline_passed'))
         hr
 
       div.enforce-big-top-margin
         #turtlediv
-      canvas#turtlecanvas.hidden width=400 height=400
+          canvas#turtlecanvas.d-none width=400 height=400
       div.enforce-big-top-margin
         #hint
-      .panel.panel-warning
-        .panel-heading = t('exercises.implement.hint')
-        .panel-body
+          .card.bg-warning
+            .card-header = t('exercises.implement.hint')
+            .card-body
       div.enforce-big-top-margin
-    #prompt.input-group.hidden
-      span.input-group-addon data-prompt=t('exercises.editor.input') = t('exercises.editor.input')
+        #prompt.input-group.d-none
+          div.input-group-prepend
+            span.input-group-text data-prompt=t('exercises.editor.input') = t('exercises.editor.input')
           input#prompt-input.form-control type='text'
           span.input-group-btn
             button#prompt-submit.btn.btn-primary type="button" = t('exercises.editor.send')
         #error-hints
           .heading = t('exercises.implement.error_hints.heading')
           ul.body
-    #output
+        #output.mt-2
           pre = t('exercises.implement.no_output_yet')
         - if CodeOcean::Config.new(:code_ocean).read[:flowr][:enabled]
-      #flowrHint.panel.panel-info data-url=CodeOcean::Config.new(:code_ocean).read[:flowr][:url] role='tab'
-        .panel-heading = 'Gain more insights here'
-        .panel-body
+          #flowrHint.card.card.text-white.bg-info data-url=CodeOcean::Config.new(:code_ocean).read[:flowr][:url] role='tab'
+            .card-header = 'Gain more insights here'
+            .card-body

app/views/exercises/_file_form.html.slim

@@ -1,41 +1,42 @@
 - id = f.object.id
 
-li.panel.panel-default
-  .panel-heading role="tab" id="heading"
-    a.file-heading data-toggle="collapse" href="#collapse#{id}"
+li.card.mt-2
+  .card-header role="tab" id="heading"
+    a.file-heading.collapsed data-toggle="collapse" href="#collapse#{id}"
       div.clearfix role="button"
+        i class="fa" aria-hidden="true"
         span = f.object.name
-  .panel-collapse.collapse class=('in' if f.object.name.nil?) id="collapse#{id}" role="tabpanel"
-    .panel-body
+  .card-collapse.collapse class=('in' if f.object.name.nil?) id="collapse#{id}" role="tabpanel"
+    .card-body
       - if policy(f.object).destroy?
         .clearfix
-          .btn.btn-warning.btn-sm.pull-right.delete-file data-file-url=code_ocean_file_path(id) = t('shared.destroy')
+          .btn.btn-warning.btn-sm.float-right.delete-file data-file-url=code_ocean_file_path(id) = t('shared.destroy')
       .form-group
         = f.label(:name, t('activerecord.attributes.file.name'))
         = f.text_field(:name, class: 'form-control')
       .form-group
         = f.label(:path, t('activerecord.attributes.file.path'))
         = f.text_field(:path, class: 'form-control')
-        .help-block = t('.hints.path')
+        .help-block.form-text = t('.hints.path')
       .form-group
         = f.label(:file_type_id, t('activerecord.attributes.file.file_type_id'))
         = f.collection_select(:file_type_id, @file_types, :id, :name, {}, class: 'form-control')
       .form-group
         = f.label(:role, t('activerecord.attributes.file.role'))
         = f.select(:role, CodeOcean::File::TEACHER_DEFINED_ROLES.map { |role| [t("files.roles.#{role}"), role] }, {include_blank: true}, class: 'form-control')
-      .checkbox
-        label
-          = f.check_box(:hidden)
+      .form-check
+        label.form-check-label
+          = f.check_box(:hidden, class: 'form-check-input')
           = t('activerecord.attributes.file.hidden')
-      .checkbox
-        label
-          = f.check_box(:read_only)
+      .form-check.mb-3
+        label.form-check-label
+          = f.check_box(:read_only, class: 'form-check-input')
           = t('activerecord.attributes.file.read_only')
       .test-related-fields style="display: #{f.object.teacher_defined_test? ? 'initial' : 'none'};"
         .form-group
           = f.label(:name, t('activerecord.attributes.file.feedback_message'))
           = f.text_area(:feedback_message, class: 'form-control', maxlength: 255)
-          .help-block = t('.hints.feedback_message')
+          .help-block.form-text = t('.hints.feedback_message')
         .form-group
           = f.label(:role, t('activerecord.attributes.file.weight'))
           = f.number_field(:weight, class: 'form-control', min: 1, step: 'any')

app/views/exercises/_form.html.slim

@@ -1,14 +1,14 @@
 - execution_environments = ExecutionEnvironment.where('file_type_id IS NOT NULL').select(:file_type_id, :id)
 - file_types = FileType.where('file_extension IS NOT NULL').select(:file_extension, :id)
 
-= form_for(@exercise, data: {execution_environments: execution_environments, file_types: file_types}, multipart: true) do |f|
+= form_for(@exercise, data: {execution_environments: execution_environments, file_types: file_types}, multipart: true, builder: PagedownFormBuilder) do |f|
   = render('shared/form_errors', object: @exercise)
   .form-group
     = f.label(:title)
     = f.text_field(:title, class: 'form-control', required: true)
   .form-group
     = f.label(:description)
-    = f.pagedown_editor :description
+    = f.pagedown :description, input_html: { preview: true, rows: 10 }
   .form-group
     = f.label(:execution_environment_id)
     = f.collection_select(:execution_environment_id, @execution_environments, :id, :name, {}, class: 'form-control')
@@ -16,34 +16,34 @@
     = f.label(:instructions)
     = f.hidden_field(:instructions)
     .form-control.markdown
-  .checkbox
-    label
-      = f.check_box(:public)
+  .form-check
+    label.form-check-label
+      = f.check_box(:public, class: 'form-check-input')
       = t('activerecord.attributes.exercise.public')
-  .checkbox
-    label
-      = f.check_box(:hide_file_tree)
+  .form-check
+    label.form-check-label
+      = f.check_box(:hide_file_tree, class: 'form-check-input')
       = t('activerecord.attributes.exercise.hide_file_tree')
-  .checkbox
-    label
-      = f.check_box(:allow_file_creation)
+  .form-check
+    label.form-check-label
+      = f.check_box(:allow_file_creation, class: 'form-check-input')
       = t('activerecord.attributes.exercise.allow_file_creation')
-  .checkbox
-    label
-      = f.check_box(:allow_auto_completion)
+  .form-check.mb-3
+    label.form-check-label
+      = f.check_box(:allow_auto_completion, class: 'form-check-input')
       = t('activerecord.attributes.exercise.allow_auto_completion')
   .form-group
     = f.label(t('activerecord.attributes.exercise.difficulty'))
-    = f.number_field :expected_difficulty, in: 1..10, step: 1
+    = f.number_field :expected_difficulty, in: 1..10, step: 1, class: 'form-control'
 
   h2 = t('exercises.form.tags')
-  ul.list-unstyled.panel-group
-    li.panel.panel-default
-      .panel-heading role="tab" id="heading"
+  ul.list-unstyled.card-group
+    li.card
+      .card-header role="tab" id="heading"
         a.file-heading data-toggle="collapse" href="#tag-collapse"
           div.clearfix role="button"
             span = t('exercises.form.click_to_collapse')
-      .panel-collapse.collapse id="tag-collapse" role="tabpanel"
+      .card-collapse.collapse id="tag-collapse" role="tabpanel"
         .table-responsive
           table.table#tags-table
             thead
@@ -55,15 +55,15 @@
                 tr
                   td = b.check_box
                   td = b.object.tag.name
-                  td = number_field "tag_factors[#{b.object.tag.id}]", :factor, :value => b.object.factor, in: 1..10, step: 1
+                  td = number_field "tag_factors[#{b.object.tag.id}]", :factor, :value => b.object.factor, in: 1..10, step: 1, class: 'form-control-sm'
 
   h2 = t('activerecord.attributes.exercise.files')
-  ul#files.list-unstyled.panel-group
+  ul#files.list-unstyled
     = f.fields_for :files do |files_form|
       = render('file_form', f: files_form)
 
-  a#add-file.btn.btn-default.btn-sm.pull-right href='#' = t('.add_file')
-  ul#dummies.hidden = f.fields_for(:files, CodeOcean::File.new, child_index: 'index') do |files_form|
+  a#add-file.btn.btn-secondary.btn-sm.float-right href='#' = t('.add_file')
+  ul#dummies.d-none = f.fields_for(:files, CodeOcean::File.new, child_index: 'index') do |files_form|
     = render('file_form', f: files_form)
 
   .actions = render('shared/submit_button', f: f, object: @exercise)

app/views/exercises/_request_comment_dialogcontent.html.slim

@@ -2,7 +2,7 @@ h5#rfc_intervention_text style='display: none;' = t('exercises.implement.rfc_int
 h5 = t('exercises.implement.comment.question')
 
 
-textarea.form-control#question(style='resize:none;')
+textarea.form-control.flex-grow-1#question(style='resize:none;')
 p = ''
 / data-cause='requestComments' is not used here right now, we pass the button #requestComments (not askForCommentsButton) as initiator of the action. 
 / But if we use this button, it will work since the correct cause is supplied

app/views/exercises/external_users/statistics.html.slim

@@ -10,21 +10,21 @@ h1 = "#{@exercise} (external user #{@external_user})"
       - file_types.add(ActiveSupport::JSON.encode(file.file_type))
     - all_files.push(submission.files)
 
-  .hidden#data data-submissions=ActiveSupport::JSON.encode(@submissions) data-files=ActiveSupport::JSON.encode(all_files) data-file-types=ActiveSupport::JSON.encode(file_types)
+  .d-none#data data-submissions=ActiveSupport::JSON.encode(@submissions) data-files=ActiveSupport::JSON.encode(all_files) data-file-types=ActiveSupport::JSON.encode(file_types)
 
   #stats-editor.row
     - index = 0
     - all_files.each do |files|
-      .files class=(@exercise.hide_file_tree ? 'hidden col-sm-3' : 'col-sm-3') data-index=index data-entries=FileTree.new(files).to_js_tree
+      .files class=(@exercise.hide_file_tree ? 'd-none col-sm-3' : 'col-sm-3') data-index=index data-entries=FileTree.new(files).to_js_tree
       - index += 1
     div class=(@exercise.hide_file_tree ? 'col-sm-12' : 'col-sm-9')
       #current-file.editor
 
   .flex-container
-    button.btn.btn-default id='play-button'
+    button.btn.btn-secondary id='play-button'
       span.fa.fa-play
     #submissions-slider.flex-item
-      input type='range' orient='horizontal' list='datapoints' min=0 max=@submissions.length-1 value=0
+      input type='range' orient='horizontal' list='datapoints' min=0 max=@submissions.length-1 value=0 style="width: 100%"
       datalist#datapoints
         - index=0
         - @submissions.each do |submission|
@@ -59,7 +59,7 @@ h1 = "#{@exercise} (external user #{@external_user})"
                 td =
                 td = @working_times_until[index] if index > 0
     p = t('.addendum')
-    .hidden#wtimes data-working_times=ActiveSupport::JSON.encode(@working_times_until);
+    .d-none#wtimes data-working_times=ActiveSupport::JSON.encode(@working_times_until);
     div#progress_chart.col-lg-12
       .graph-functions-2
 

app/views/exercises/feedback.html.slim

@@ -8,17 +8,17 @@ h1 = link_to(@exercise, exercise_path(@exercise))
   - if @feedbacks.nil? or @feedbacks.size == 0
     .no-feedback = t('user_exercise_feedback.no_feedback')
 
-  ul.list-unstyled.panel-group
+  ul.list-unstyled
     - @feedbacks.each do |feedback|
-      li.panel.panel-default
-        .panel-heading role="tab" id="heading"
+      li.card.mt-2
+        .card-header role="tab" id="heading"
           div.clearfix.feedback-header
             span.username = link_to(feedback.user.name, statistics_external_user_exercise_path(id: @exercise.id, external_user_id: feedback.user.id))
             - if feedback.anomaly_notification
               i class="fa fa-envelope-o" data-placement="top" data-toggle="tooltip" data-container="body" title=feedback.anomaly_notification.reason
             span.date = feedback.created_at
-        .panel-collapse role="tabpanel"
-          .panel-body.feedback
+        .card-collapse role="tabpanel"
+          .card-body.feedback
             .text = feedback.feedback_text
             .difficulty = "#{t('user_exercise_feedback.difficulty')} #{feedback.difficulty}" if feedback.difficulty
             .worktime = "#{t('user_exercise_feedback.working_time')} #{feedback.user_estimated_worktime}" if feedback.user_estimated_worktime

app/views/exercises/implement.html.slim

@@ -2,13 +2,13 @@
   #editor-column.col-md-12
     .exercise.clearfix
       div
-        span.badge.pull-right.score
+        span.badge.badge-pill.float-right.score
 
         h1 id="exercise-headline"
           i class="fa fa-chevron-down" id="description-symbol"
           = @exercise.title
 
-      #description-panel.lead.description-panel
+      #description-card.lead.description-card
         = render_markdown(@exercise.description)
 
       a#toggle href="#" data-show=t('shared.show') data-hide=t('shared.hide') = t('shared.hide')

app/views/exercises/index.html.slim

@@ -9,45 +9,43 @@ h1 = Exercise.model_name.human(count: 2)
     = f.search_field(:title_cont, class: 'form-control', placeholder: t('activerecord.attributes.exercise.title'))
 
 .table-responsive
-  table.table
+  table.table.mt-4
     thead
       tr
-        th = sort_link(@search, :title, t('activerecord.attributes.exercise.title'))
-        th = sort_link(@search, :execution_environment_id, t('activerecord.attributes.exercise.execution_environment'))
-        th = t('.test_files')
-        th = t('activerecord.attributes.exercise.maximum_score')
-        th = t('activerecord.attributes.exercise.tags')
-        th = t('activerecord.attributes.exercise.difficulty')
-        th
+        th.p-1 = sort_link(@search, :title, t('activerecord.attributes.exercise.title'))
+        th.p-1 = sort_link(@search, :execution_environment_id, t('activerecord.attributes.exercise.execution_environment'))
+        th.p-1 = t('.test_files')
+        th.p-1 = t('activerecord.attributes.exercise.maximum_score')
+        th.p-1 = t('activerecord.attributes.exercise.tags')
+        th.p-1 = t('activerecord.attributes.exercise.difficulty')
+        th.p-1
           = t('activerecord.attributes.exercise.public')
           - if policy(Exercise).batch_update?
             br
             span.batch = link_to(t('shared.batch_update'), '#', 'data-text' => t('shared.update', model: t('activerecord.models.exercise.other')))
-        th colspan=6 = t('shared.actions')
+        th.p-1 colspan=6 = t('shared.actions')
     tbody
       - @exercises.each do |exercise|
         tr data-id=exercise.id
-          td = exercise.title
-          td = link_to_if(exercise.execution_environment && policy(exercise.execution_environment).show?, exercise.execution_environment, exercise.execution_environment)
-          td = exercise.files.teacher_defined_tests.count
-          td = exercise.maximum_score
-          td = exercise.exercise_tags.count
-          td = exercise.expected_difficulty
-          td.public data-value=exercise.public? = symbol_for(exercise.public?)
-          td = link_to(t('shared.edit'), edit_exercise_path(exercise)) if policy(exercise).edit?
-          td = link_to(t('.implement'), implement_exercise_path(exercise)) if policy(exercise).implement?
-          td = link_to(t('shared.statistics'), statistics_exercise_path(exercise), 'data-turbolinks' => "false") if policy(exercise).statistics?
+          td.p-1.pt-2 = link_to(exercise.title, exercise, 'data-turbolinks' => "false") if policy(exercise).show?
+          td.p-1.pt-2 = link_to_if(exercise.execution_environment && policy(exercise.execution_environment).show?, exercise.execution_environment, exercise.execution_environment)
+          td.p-1.pt-2 = exercise.files.teacher_defined_tests.count
+          td.p-1.pt-2 = exercise.maximum_score
+          td.p-1.pt-2 = exercise.exercise_tags.count
+          td.p-1.pt-2 = exercise.expected_difficulty
+          td.p-1.pt-2.public data-value=exercise.public? = symbol_for(exercise.public?)
+          td.p-1.pt-2 = link_to(t('shared.edit'), edit_exercise_path(exercise)) if policy(exercise).edit?
+          td.p-1.pt-2 = link_to(t('.implement'), implement_exercise_path(exercise)) if policy(exercise).implement?
+          td.p-1.pt-2 = link_to(t('shared.statistics'), statistics_exercise_path(exercise), 'data-turbolinks' => "false") if policy(exercise).statistics?
 
-          td
+          td.p-1
             .btn-group
-              button.btn.btn-primary-outline.btn-xs.dropdown-toggle data-toggle="dropdown" type="button" = t('shared.actions_button')
-              span.caret
-              span.sr-only Toggle Dropdown
-              ul.dropdown-menu.pull-right role="menu"
-                li = link_to(t('shared.show'), exercise, 'data-turbolinks' => "false") if policy(exercise).show?
-                li = link_to(t('activerecord.models.user_exercise_feedback.other'), feedback_exercise_path(exercise)) if policy(exercise).feedback?
-                li = link_to(t('shared.destroy'), exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete) if policy(exercise).destroy?
-                li = link_to(t('.clone'), clone_exercise_path(exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post) if policy(exercise).clone?
+              button.btn.btn-outline-primary.btn-sm.dropdown-toggle data-toggle="dropdown" type="button" = t('shared.actions_button')
+              ul.dropdown-menu.float-right role="menu"
+                li = link_to(t('shared.show'), exercise, 'data-turbolinks' => "false", class: 'dropdown-item') if policy(exercise).show?
+                li = link_to(t('activerecord.models.user_exercise_feedback.other'), feedback_exercise_path(exercise), class: 'dropdown-item') if policy(exercise).feedback?
+                li = link_to(t('shared.destroy'), exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete, class: 'dropdown-item') if policy(exercise).destroy?
+                li = link_to(t('.clone'), clone_exercise_path(exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post, class: 'dropdown-item') if policy(exercise).clone?
 
 = render('shared/pagination', collection: @exercises)
 p = render('shared/new_button', model: Exercise)

app/views/exercises/show.html.slim

@@ -12,7 +12,7 @@ h1
 
 = row(label: 'exercise.title', value: @exercise.title)
 = row(label: 'exercise.user', value: link_to_if(policy(@exercise.author).show?, @exercise.author, @exercise.author))
-= row(label: 'exercise.description', value: render_markdown(@exercise.description))
+= row(label: 'exercise.description', value: render_markdown(@exercise.description), class: 'm-0')
 = row(label: 'exercise.execution_environment', value: link_to_if(policy(@exercise.execution_environment).show?, @exercise.execution_environment, @exercise.execution_environment))
 /= row(label: 'exercise.instructions', value: render_markdown(@exercise.instructions))
 = row(label: 'exercise.maximum_score', value: @exercise.maximum_score)
@@ -20,24 +20,23 @@ h1
 = row(label: 'exercise.hide_file_tree', value: @exercise.hide_file_tree?)
 = row(label: 'exercise.allow_file_creation', value: @exercise.allow_file_creation?)
 = row(label: 'exercise.allow_auto_completion', value: @exercise.allow_auto_completion?)
-= row(label: 'exercise.embedding_parameters') do
-  = content_tag(:input, nil, class: 'form-control', readonly: true, value: embedding_parameters(@exercise))
 = row(label: 'exercise.difficulty', value: @exercise.expected_difficulty)
 = row(label: 'exercise.tags', value: @exercise.exercise_tags.map{|et| "#{et.tag.name} (#{et.factor})"}.sort.join(", "))
+= row(label: 'exercise.embedding_parameters', class: 'mb-4') do
+  = content_tag(:input, nil, class: 'form-control mb-4', readonly: true, value: embedding_parameters(@exercise))
 
-h2 = t('activerecord.attributes.exercise.files')
+h2.mt-4 = t('activerecord.attributes.exercise.files')
 
-ul.list-unstyled.panel-group#files
+ul.list-unstyled#files
   - @exercise.files.each do |file|
-    li.panel.panel-default
-      .panel-heading role="tab" id="heading"
-        a.file-heading data-toggle="collapse" data-parent="#files" href=".collapse#{file.id}"
+    li.card.mt-2
+      .card-header role="tab" id="heading"
+        a.file-heading.collapsed data-toggle="collapse" data-parent="#files" href=".collapse#{file.id}"
           div.clearfix role="button"
+            i class="fa" aria-hidden="true"
             span = file.name_with_extension
-            // probably set an icon here that shows that the rows can be collapsed
-            //span.pull-right.collapse.in class="collapse#{file.id}" &#9788
-      .panel-collapse.collapse class="collapse#{file.id}" role="tabpanel"
-        .panel-body
+      .card-collapse.collapse class="collapse#{file.id}" role="tabpanel"
+        .card-body
           - if policy(file).destroy?
-            .clearfix = link_to(t('shared.destroy'), file, class:'btn btn-warning btn-sm pull-right', data: {confirm: t('shared.confirm_destroy')}, method: :delete)
+            .clearfix = link_to(t('shared.destroy'), file, class:'btn btn-warning btn-sm float-right', data: {confirm: t('shared.confirm_destroy')}, method: :delete)
           = render('shared/file', file: file)

app/views/exercises/statistics.html.slim

@@ -32,7 +32,7 @@ h1 = @exercise
       -working_time = @exercise.average_working_time_for(user.id) or 0
       -working_time_array.push working_time
     hr
-    .hidden#data data-working-time=ActiveSupport::JSON.encode(working_time_array)
+    .d-none#data data-working-time=ActiveSupport::JSON.encode(working_time_array)
     .graph-functions
     div#chart_1
     hr

app/views/external_users/show.html.slim

@@ -4,9 +4,9 @@ h1 = @user.name
 //= row(label: 'external_user.email', value: @user.email)
 = row(label: 'external_user.consumer', value: link_to(@user.consumer, @user.consumer))
 
-h4 = link_to(t('.exercise_statistics'), statistics_external_user_path(@user))
+h4.mt-4 = link_to(t('.exercise_statistics'), statistics_external_user_path(@user))
 
-h4 = t('.tag_statistics')
+h4.mt-4 = t('.tag_statistics')
 #loading
   .spinner
   = t('.loading_tag_statistics')

app/views/file_templates/index.html.slim

@@ -10,7 +10,7 @@ h1 = FileTemplate.model_name.human(count: 2)
     tbody
       - @file_templates.each do |file_template|
         tr
-          td = file_template.name
+          td = link_to(file_template.name, file_template)
           td = link_to(file_template.file_type, file_type_path(file_template.file_type))
           td = link_to(t('shared.show'), file_template)
           td = link_to(t('shared.edit'), edit_file_template_path(file_template))

app/views/file_types/_form.html.slim

@@ -12,16 +12,16 @@
   .form-group
     = f.label(:indent_size)
     = f.number_field(:indent_size, class: 'form-control', placeholder: 2, required: true)
-  .checkbox
-    label
-      = f.check_box(:binary)
+  .form-check
+    label.form-check-label
+      = f.check_box(:binary, class: 'form-check-input')
       = t('activerecord.attributes.file_type.binary')
-  .checkbox
-    label
-      = f.check_box(:executable)
+  .form-check
+    label.form-check-label
+      = f.check_box(:executable, class: 'form-check-input')
       = t('activerecord.attributes.file_type.executable')
-  .checkbox
-    label
-      = f.check_box(:renderable)
+  .form-check.mb-3
+    label.form-check-label
+      = f.check_box(:renderable, class: 'form-check-input')
       = t('activerecord.attributes.file_type.renderable')
   .actions = render('shared/submit_button', f: f, object: @file_type)

app/views/file_types/index.html.slim

@@ -11,7 +11,7 @@ h1 = FileType.model_name.human(count: 2)
     tbody
       - @file_types.each do |file_type|
         tr
-          td = file_type.name
+          td = link_to(file_type.name, file_type)
           td = link_to(file_type.author, file_type.author)
           td = file_type.file_extension
           td = link_to(t('shared.show'), file_type)

app/views/file_types/show.json.jbuilder

@@ -0,0 +1 @@
+json.extract! @file_type, :id, :name, :editor_mode, :file_extension, :executable, :renderable, :binary

app/views/hints/_form.html.slim

@@ -3,15 +3,15 @@
   .form-group
     = f.label(:name)
     = f.text_field(:name, class: 'form-control', required: true)
-  .form
+  .form-group
     = f.label(:locale)
     = f.select(:locale, I18n.available_locales.map { |locale| [t("locales.#{locale}"), locale] }, {}, class: 'form-control')
   .form-group
     = f.label(:message)
     = f.text_field(:message, class: 'form-control', placeholder: "'$2' has no method '$1'.", required: true)
-    .help-block = t('.hints.message')
+    .help-block.form-text = t('.hints.message')
   .form-group
     = f.label(:regular_expression)
     = f.text_field(:regular_expression, class: 'form-control', placeholder: 'undefined method (\w+) for (\w+)', required: true)
-    .help-block = t('.hints.regular_expression')
+    .help-block.form-text = t('.hints.regular_expression')
   .actions = render('shared/submit_button', f: f, object: @hint)

app/views/internal_users/_form.html.slim

@@ -5,7 +5,7 @@
     = f.collection_select(:consumer_id, Consumer.all.sort_by(&:name), :id, :name, {}, class: 'form-control')
   .form-group
     = f.label(:email)
-    = f.text_field(:email, class: 'form-control', required: true)
+    = f.email_field(:email, class: 'form-control', required: true)
   .form-group
     = f.label(:name)
     = f.text_field(:name, class: 'form-control', required: true)

app/views/internal_users/activate.html.slim

@@ -9,4 +9,4 @@ h1 = t('.headline')
     = f.label(:password_confirmation)
     = f.password_field(:password_confirmation, class: 'form-control', required: true)
   = f.hidden_field(:activation_token)
-  .actions = submit_tag(t('.submit'), class: 'btn btn-default')
+  .actions = submit_tag(t('.submit'), class: 'btn btn-primary')

app/views/internal_users/forgot_password.html.slim

@@ -3,5 +3,5 @@ h1 = t('.headline')
 = form_tag do
   .form-group
     = label_tag(:email, t('activerecord.attributes.internal_user.email'))
-    = text_field_tag(:email, params[:email], autofocus: true, class: 'form-control', required: true)
-  .actions = submit_tag(t('.submit'), class: 'btn btn-default')
+    = email_field_tag(:email, params[:email], autofocus: true, class: 'form-control', required: true)
+  .actions = submit_tag(t('.submit'), class: 'btn btn-primary')

app/views/internal_users/index.html.slim

@@ -12,7 +12,7 @@ h1 = InternalUser.model_name.human(count: 2)
     = f.select(:role_eq, User::ROLES.map { |role| [t("users.roles.#{role}"), role] }, {}, class: 'form-control', prompt: t('activerecord.attributes.internal_user.role'))
 
 .table-responsive
-  table.table
+  table.table.mt-4
     thead
       tr
         th = t('activerecord.attributes.internal_user.name')

app/views/internal_users/reset_password.html.slim

@@ -9,4 +9,4 @@ h1 = t('.headline')
     = f.label(:password_confirmation)
     = f.password_field(:password_confirmation, class: 'form-control', required: true)
   = f.hidden_field(:reset_password_token)
-  .actions = submit_tag(t('.submit'), class: 'btn btn-default')
+  .actions = submit_tag(t('.submit'), class: 'btn btn-primary')

app/views/layouts/application.html.slim

@@ -13,22 +13,18 @@ html lang='en'
     = yield(:head)
     = csrf_meta_tags
   body
-    nav.navbar.navbar-default role='navigation'
+    nav.navbar.navbar-dark.bg-dark.navbar-expand-md.mb-4 role='navigation'
       .container
-        .navbar-header
-          button.navbar-toggle data-target='#navbar-collapse' data-toggle='collapse' type='button'
-            span.sr-only Toggle navigation
-            span.icon-bar
-            span.icon-bar
-            span.icon-bar
+        button.navbar-toggler data-target='#navbar-collapse' data-toggle='collapse' type='button' aria-expanded='false' aria-label='Toggle navigation'
+          span.navbar-toggler-icon.sr-only
         .navbar-brand
           i.fa.fa-code
           = application_name
         #navbar-collapse.collapse.navbar-collapse
           = render('navigation', cached: true)
-          ul.nav.navbar-nav.navbar-right
+          ul.nav.navbar-nav.ml-auto
             = render('locale_selector', cached: true)
-            li = link_to(t('shared.help.link'), '#modal-help', data: {toggle: 'modal'})
+            li.nav-item.mr-3 = link_to(t('shared.help.link'), '#modal-help', data: {toggle: 'modal'}, class: 'nav-link')
             = render('session')
     .container data-controller=controller_name
       = render('flash')

app/views/proxy_exercises/_form.html.slim

@@ -1,11 +1,11 @@
-= form_for(@proxy_exercise, multipart: true) do |f|
+= form_for(@proxy_exercise, multipart: true, builder: PagedownFormBuilder) do |f|
   = render('shared/form_errors', object: @proxy_exercise)
   .form-group
     = f.label(:title)
     = f.text_field(:title, class: 'form-control', required: true)
   .form-group
     = f.label(:description)
-    = f.pagedown_editor :description
+    = f.pagedown :description, input_html: { preview: true, rows: 10 }
 
   h3 Exercises
   .table-responsive

app/views/proxy_exercises/index.html.slim

@@ -6,30 +6,30 @@ h1 = ProxyExercise.model_name.human(count: 2)
     = f.search_field(:title_cont, class: 'form-control', placeholder: t('activerecord.attributes.proxy_exercise.title'))
 
 .table-responsive
-  table.table
+  table.table.mt-4
     thead
       tr
-        th = sort_link(@search, :title, t('activerecord.attributes.proxy_exercise.title'))
-        th = t('activerecord.attributes.exercise.token')
-        th = t('activerecord.attributes.proxy_exercise.files_count')
-        th colspan=6 = t('shared.actions')
+        th.p-1 = sort_link(@search, :title, t('activerecord.attributes.proxy_exercise.title'))
+        th.p-1 = t('activerecord.attributes.exercise.token')
+        th.p-1 = t('activerecord.attributes.proxy_exercise.files_count')
+        th.p-1 colspan=6 = t('shared.actions')
     tbody
       - @proxy_exercises.each do |proxy_exercise|
         tr data-id=proxy_exercise.id
-          td = link_to(proxy_exercise.title,proxy_exercise)
-          td = proxy_exercise.token
-          td = proxy_exercise.count_files
-          td = link_to(t('shared.edit'), edit_proxy_exercise_path(proxy_exercise)) if policy(proxy_exercise).edit?
+          td.p-1.pt-2 = link_to(proxy_exercise.title,proxy_exercise)
+          td.p-1.pt-2 = proxy_exercise.token
+          td.p-1.pt-2 = proxy_exercise.count_files
+          td.p-1.pt-2 = link_to(t('shared.edit'), edit_proxy_exercise_path(proxy_exercise)) if policy(proxy_exercise).edit?
 
-          td
+          td.p-1
             .btn-group
-              button.btn.btn-primary-outline.btn-xs.dropdown-toggle data-toggle="dropdown" type="button" = t('shared.actions_button')
+              button.btn.btn-outline-primary.btn-sm.dropdown-toggle data-toggle="dropdown" type="button" = t('shared.actions_button')
               span.caret
               span.sr-only Toggle Dropdown
-              ul.dropdown-menu.pull-right role="menu"
-                li = link_to(t('shared.show'), proxy_exercise, 'data-turbolinks' => "false") if policy(proxy_exercise).show?
-                li = link_to(t('shared.destroy'), proxy_exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete) if policy(proxy_exercise).destroy?
-                li = link_to(t('.clone'), clone_proxy_exercise_path(proxy_exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post) if policy(proxy_exercise).clone?
+              ul.dropdown-menu.float-right role="menu"
+                li = link_to(t('shared.show'), proxy_exercise, 'data-turbolinks' => "false", class: 'dropdown-item') if policy(proxy_exercise).show?
+                li = link_to(t('shared.destroy'), proxy_exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete, class: 'dropdown-item') if policy(proxy_exercise).destroy?
+                li = link_to(t('.clone'), clone_proxy_exercise_path(proxy_exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post, class: 'dropdown-item') if policy(proxy_exercise).clone?
 
 = render('shared/pagination', collection: @proxy_exercises)
 p = render('shared/new_button', model: ProxyExercise)

app/views/proxy_exercises/show.html.slim

@@ -14,7 +14,8 @@ h1
 = row(label: 'proxy_exercise.files_count', value: @exercises.count)
 = row(label: 'exercise.description', value: @proxy_exercise.description)
 = row(label: 'exercise.token', value: @proxy_exercise.token)
-h3 Exercises
+
+h2.mt-4 Exercises
 .table-responsive
   table.table
     thead

app/views/request_for_comments/_admin_menu.html.slim

@@ -1,9 +1,8 @@
-br
-h4 Admin Menu
-h5
-  ul
+hr
+h5.mt-4 Admin Menu
+ul.text
   li = link_to "User's current status of this exercise", statistics_external_user_exercise_path(id: @request_for_comment.exercise_id, external_user_id: @request_for_comment.user_id)
   li = link_to "All exercises of this user", statistics_external_user_path(id: @request_for_comment.user_id)
-  ul
+ul.text
   li = link_to "Implement the exercise yourself", implement_exercise_path(id: @request_for_comment.exercise_id)
   li = link_to "Show the exercise", exercise_path(id: @request_for_comment.exercise_id)

app/views/request_for_comments/_mark_as_solved.html.slim

@@ -4,4 +4,4 @@ button.btn.btn-primary#mark-as-solved-button = t('request_for_comments.mark_as_s
   p = t('request_for_comments.write_a_thank_you_node')
   textarea#thank-you-note
   button.btn.btn-primary#send-thank-you-note = t('request_for_comments.send_thank_you_note')
-  button.btn.btn-default#cancel-thank-you-note = t('request_for_comments.cancel_thank_you_note')
+  button.btn.btn-secondary#cancel-thank-you-note = t('request_for_comments.cancel_thank_you_note')

app/views/request_for_comments/index.html.slim

@@ -9,7 +9,7 @@ h1 = RequestForComment.model_name.human(count: 2)
     = f.select(:solved_not_eq,  [[t('request_for_comments.show_all'), 2], [t('request_for_comments.show_unsolved'), 1], [t('request_for_comments.show_solved'), 0]])
 
 .table-responsive
-  table.table.sortable
+  table.table.sortable.mt-4
     thead
       tr
         th
@@ -39,7 +39,7 @@ h1 = RequestForComment.model_name.human(count: 2)
           - else
             td = '-'
           td = request_for_comment.comments_count
-          td = request_for_comment.user.displayname
+          td = link_to_if(request_for_comment.user && policy(request_for_comment.user).show?, request_for_comment.user.displayname, request_for_comment.user)
           td = t('shared.time.before', time: distance_of_time_in_words_to_now(request_for_comment.created_at))
           td = t('shared.time.before', time: distance_of_time_in_words_to_now(request_for_comment.last_comment.nil? ? request_for_comment.updated_at : request_for_comment.last_comment))
 

app/views/request_for_comments/show.html.erb

@@ -25,7 +25,7 @@
     </div>
 
     <div class="question">
-      <h5>
+      <h5 class="mt-4">
         <%= t('activerecord.attributes.request_for_comments.question')%>
       </h5>
       <div class="text">
@@ -42,7 +42,7 @@
       <div class="testruns">
         <% output_runs = testruns.select { |run| run.cause == 'run' } %>
         <% if output_runs.size > 0 %>
-          <h5><%= t('request_for_comments.runtime_output') %></h5>
+          <h5 class="mt-4"><%= t('request_for_comments.runtime_output') %></h5>
           <div class="collapsed testrun-output text">
             <span class="fa fa-chevron-down collapse-button"></span>
             <% output_runs.each do |testrun| %>
@@ -63,7 +63,7 @@
 
         <% assess_runs = testruns.select { |run| run.cause == 'assess' } %>
         <% if assess_runs.size > 0 %>
-          <h5><%= t('request_for_comments.test_results') %></h5>
+          <h5 class="mt-4"><%= t('request_for_comments.test_results') %></h5>
           <div class="testrun-assess-results">
             <% assess_runs.each do |testrun| %>
               <div class="testrun-container">
@@ -86,7 +86,7 @@
     <hr>
 
     <div class="howto">
-      <h5>
+      <h5 class="mt-4">
         <%= t('request_for_comments.howto_title') %>
       </h5>
       <div class="text">
@@ -96,7 +96,7 @@
   </div>
 </div>
 
-<div class="hidden sanitizer"></div>
+<div class="d-none sanitizer"></div>
 <!--
 do not put a carriage return in the line below. it will be present in the presentation of the source code, otherwise.
 also, all settings from the rails model needed for the editor configuration in the JavaScript are attached to the editor as data attributes here.
@@ -205,16 +205,16 @@ also, all settings from the rails model needed for the editor configuration in t
           <div class="comment-header"> \
             <div class="comment-username">' + preprocess(comment.username) + '</div> \
             <div class="comment-date">' + comment.date + '</div> \
-            <div class="comment-updated' + (comment.updated ? '' : ' hidden') + '"> \
+            <div class="comment-updated' + (comment.updated ? '' : ' d-none') + '"> \
               <i class="fa fa-pencil" aria-hidden="true"></i> \
               <%= t('request_for_comments.comment_edited') %> \
             </div> \
           </div> \
           <div class="comment-content">' + commentText + '</div> \
           <textarea class="comment-editor">' + commentText + '</textarea> \
-          <div class="comment-actions' + (comment.editable ? '' : ' hidden') + '"> \
-            <button class="action-edit btn btn-xs btn-warning"><%= t('shared.edit') %></button> \
-            <button class="action-delete btn btn-xs btn-danger"><%= t('shared.destroy') %></button> \
+          <div class="comment-actions' + (comment.editable ? '' : ' d-none') + '"> \
+            <button class="action-edit btn btn-sm btn-warning"><%= t('shared.edit') %></button> \
+            <button class="action-delete btn btn-sm btn-danger"><%= t('shared.destroy') %></button> \
           </div> \
         </div>';
     });
@@ -380,7 +380,7 @@ also, all settings from the rails model needed for the editor configuration in t
     $(target).popover('show');
     $(target).on('mouseleave', function () {
       $(this).off('mouseleave');
-      $(this).popover('destroy');
+      $(this).popover('dispose');
     });
   }
 
@@ -440,7 +440,7 @@ also, all settings from the rails model needed for the editor configuration in t
             deleteButton.show();
             commentContent.show();
             commentEditor.hide();
-            commentUpdated.removeClass('hidden');
+            commentUpdated.removeClass('d-none');
           });
         } else {
           button.text('<%= t('comments.save_update') %>');

app/views/sessions/new.html.slim

@@ -3,13 +3,14 @@ h1 = t('.headline')
 = form_tag(sessions_path) do
   .form-group
     = label_tag(:email, t('activerecord.attributes.internal_user.email'))
-    = text_field_tag(:email, params[:email], autofocus: true, class: 'form-control', required: true)
+    = email_field_tag(:email, params[:email], autofocus: true, class: 'form-control', required: true)
   .form-group
     = label_tag(:password, t('activerecord.attributes.internal_user.password'))
     = password_field_tag(:password, nil, class: 'form-control', required: true)
-  .checkbox
-    label
-      = check_box_tag(:remember_me)
+  .form-check.form-group
+    label.form-check-label
+      // Set values 1 and true/false explicit to allow passing a custom HTML class
+      = check_box_tag(:remember_me, 1, true, class: 'form-check-input')
       = t('.remember_me')
-    span.pull-right = link_to(t('.forgot_password'), forgot_password_path)
-  .actions = submit_tag(t('.link'), class: 'btn btn-default')
+    span.float-right = link_to(t('.forgot_password'), forgot_password_path)
+  .actions = submit_tag(t('.link'), class: 'btn btn-primary')

app/views/shared/_edit_button.html.slim

@@ -1,3 +1,3 @@
 // default value for fetch will always be evaluated even if it is not returned
 - link_target = local_assigns.fetch(:path, false) || send(:"edit_#{object.class.name.underscore}_path", object)
-= link_to(t('shared.edit'), link_target, class: 'btn btn-default pull-right')
+= link_to(t('shared.edit'), link_target, class: 'btn btn-secondary float-right')

app/views/shared/_file.html.slim

@@ -5,6 +5,6 @@
 = row(label: 'file.hidden', value: file.hidden)
 = row(label: 'file.read_only', value: file.read_only)
 - if file.teacher_defined_test?
-  = row(label: 'file.feedback_message', value: render_markdown(file.feedback_message))
+  = row(label: 'file.feedback_message', value: render_markdown(file.feedback_message), class: 'm-0')
   = row(label: 'file.weight', value: file.weight)
 = row(label: 'file.content', value: file.native_file? ? link_to(file.native_file.file.filename, file.native_file.url) : code_tag(file.content))

app/views/shared/_form_filters.html.slim

@@ -1,11 +1,9 @@
-.well
+.card.card-body.bg-light
   = search_form_for(@search, class: 'clearfix filter-form form-inline') do |f|
     = yield(f)
-    .btn-group.pull-right
-      button.btn.btn-default.btn-sm type='submit' = t('shared.apply_filters')
-      button.btn.btn-default.btn-sm.dropdown-toggle data-toggle='dropdown' type='button'
-        span.caret
-        span.sr-only Toggle Dropdown
+    .btn-group.ml-auto
+      button.btn.btn-primary type='submit' = t('shared.apply_filters')
+      button.btn.btn-primary.dropdown-toggle data-toggle='dropdown' type='button'
       ul.dropdown-menu role='menu'
         li
-          a href=request.path = t('shared.reset_filters')
+          a.dropdown-item href=request.path = t('shared.reset_filters')

app/views/shared/_modal.html.slim

@@ -2,10 +2,10 @@
   .modal-dialog class=local_assigns[:classes]
     .modal-content
       .modal-header
+        h4#modal-title.modal-title = title
         button.close data-dismiss='modal' type='button'
           span aria-hidden=true ×
           span.sr-only Close
-        h4#modal-title.modal-title = title
       .modal-body
         - if local_assigns.has_key?(:body)
           = body

app/views/shared/_pagination.html.slim

@@ -1,3 +1,2 @@
-- if (pagination = will_paginate(collection, container: false)).present?
-  .text-center
-    ul.pagination = pagination
+- if (pagination = will_paginate(collection, container: false, renderer: WillPaginate::ActionView::Bootstrap4LinkRenderer)).present?
+  ul.pagination.justify-content-center = pagination

app/views/shared/_submit_button.html.slim

@@ -1 +1 @@
-= f.submit(class: 'btn btn-default', value: t(object.new_record? ? 'shared.create' : 'shared.update', model: object.class.model_name.human))
+= f.submit(class: 'btn btn-primary', value: t(object.new_record? ? 'shared.create' : 'shared.update', model: object.class.model_name.human))

app/views/statistics/graphs.html.slim

@@ -10,11 +10,11 @@
     h1 = t('.user_activity')
     a href=statistics_graphs_user_activity_history_path = t('.history')
   .spinner
-  .graph#user-activity
+  .graph.mb-5#user-activity
 
 .group
   .title
     h1 = t('.rfc_activity')
     a href=statistics_graphs_rfc_activity_history_path = t('.history')
   .spinner
-  .graph#rfc-activity
+  .graph.mb-5#rfc-activity

app/views/submissions/index.html.slim

@@ -9,7 +9,7 @@ h1 = Submission.model_name.human(count: 2)
     = f.select(:cause_eq, Submission.select(:cause).distinct.map(&:cause).sort, class: 'form-control', prompt: t('activerecord.attributes.submission.cause'))
 
 .table-responsive
-  table.table
+  table.table.mt-4
     thead
       tr
         th = sort_link(@search, :exercise_id, t('activerecord.attributes.submission.exercise'))

app/views/submissions/show.html.slim

@@ -1,3 +1,10 @@
+- content_for :head do
+  // Force a full page reload, see https://github.com/turbolinks/turbolinks/issues/326.
+     Otherwise, code might not be highlighted correctly (race condition)
+  meta name='turbolinks-visit-control' content='reload'
+  = javascript_include_tag(asset_path('highlight.min.js', type: :javascript))
+  = stylesheet_link_tag(asset_path('highlight-default.css', type: :stylesheet))
+
 h1 = @submission
 
 = row(label: 'submission.exercise', value: link_to(@submission.exercise, @submission.exercise))
@@ -5,9 +12,9 @@ h1 = @submission
 = row(label: 'submission.cause', value: t("submissions.causes.#{@submission.cause}"))
 = row(label: 'submission.score', value: @submission.score)
 
-h2 = t('activerecord.attributes.submission.files')
+h2.mt-4 = t('activerecord.attributes.submission.files')
 
 ul.list-unstyled
   - @files.each do |file|
-    li.panel.panel-default
-      .panel-body = render('shared/file', file: file)
+    li.card.mt-2
+      .card-body = render('shared/file', file: file)

app/views/submissions/statistics.html.slim

@@ -4,7 +4,7 @@ h1 = @submission
 = row(label: 'submission.score', value: @submission.score)
 = row(label: '.siblings', value: @submission.siblings.count)
 
-h2 = t('.history')
+h2.mt-4 = t('.history')
 
 .table-responsive
   table.table

app/views/user_exercise_feedbacks/_form.html.slim

@@ -1,6 +1,6 @@
 = form_for(@uef) do |f|
   div
-    span.badge.pull-right.score
+    span.badge.badge-pill.float-right.score
 
     h1 id="exercise-headline"
       = t('activerecord.models.user_exercise_feedback.one') + " "
@@ -8,16 +8,16 @@
   = render('shared/form_errors', object: @uef)
   h4
     == t('user_exercise_feedback.description')
-  #description-panel.lead.description-panel
+  #description-card.lead.description-card
     u = t('activerecord.attributes.exercise.description')
     = render_markdown(@exercise.description)
   .form-group
     = f.text_area(:feedback_text, class: 'form-control', required: true, :rows => "10")
     h4 = t('user_exercise_feedback.difficulty')
-    = f.collection_radio_buttons :difficulty, @texts, :first, :last, html_options={class: "radio-inline"}  do |b|
-      = b.label(:class => 'radio') { b.radio_button + b.text }
+    = f.collection_radio_buttons :difficulty, @texts, :first, :last, html_options={class: "form-check-inline"}  do |b|
+      = b.label(:class => 'form-check') { b.radio_button + b.text }
     h4 = t('user_exercise_feedback.working_time')
-    = f.collection_radio_buttons :user_estimated_worktime, @times, :first, :last, html_options={class: "radio-inline"}  do |b|
-      = b.label(:class => 'radio') { b.radio_button + b.text }
+    = f.collection_radio_buttons :user_estimated_worktime, @times, :first, :last, html_options={class: "form-check-inline"}  do |b|
+      = b.label(:class => 'form-check') { b.radio_button + b.text }
     = f.hidden_field(:exercise_id, :value => @exercise.id)
   .actions = render('shared/submit_button', f: f, object: @uef)