working pagedown!!!!

app/assets/javascripts/exercises.js

@@ -160,6 +160,7 @@ $(function() {
      // 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/markdown_editor.js

@@ -1,22 +0,0 @@
-(function() {
-    var ACE_FILES_PATH = '/assets/ace/';
-
-    converter = Markdown.getSanitizingConverter()
-    editor    = new Markdown.Editor converter
-
-    editor.run();
-    editor.refreshPreview()
-
-    window.MarkdownEditor = function(selector) {
-        ace.config.set('modePath', ACE_FILES_PATH);
-        var editor = ace.edit($(selector).next()[0]);
-        editor.on('change', function() {
-            $(selector).val(editor.getValue());
-        });
-        editor.setShowPrintMargin(false);
-        var session = editor.getSession();
-        session.setMode('markdown');
-        session.setUseWrapMode(true);
-        session.setValue($(selector).val());
-    };
-})();

app/assets/javascripts/pagedown.js

@@ -0,0 +1,11 @@
+(function() {
+    var ACE_FILES_PATH = '/assets/ace/';
+
+    window.PagedownEditor = function(selector) {
+        var converter = Markdown.getSanitizingConverter();
+        var editor    = new Markdown.Editor( converter );
+
+        editor.run();
+
+    };
+})();