added a javascript snippet widget

workflows/base/interaction_views.py

+import json
+from django.shortcuts import render
+
+
+def base_js_snippet(request, input_dict, output_dict, widget):
+    try:
+        inputs = json.dumps(input_dict['in'])
+    except:
+        raise Exception("Problem serializing the inputs. Only JSON-serializable objects can be used.")
+    return render(request, 'interactions/base_js_snippet.html',
+                  {'widget': widget, 'snippet': input_dict['snippet'], 'inputs': inputs})

workflows/base/library.py

 import cPickle
+import json
 
 def base_concatenate_lists(input_dict):
     lists = input_dict['lists']
@@ -219,3 +220,14 @@ def base_average_list(input_dict):
         average = None
 
     return {'average': average}
+
+def base_js_snippet(input_dict):
+    return {'out': None}
+
+def base_js_snippet_finished(postdata, input_dict, output_dict):
+    try:
+        out_list = json.loads(postdata['out'][0])
+        out = out_list[0]
+    except:
+        raise Exception("Problem de-serializing the output.")
+    return {'out': out}

workflows/base/package_data/widgets/f07ffb9c-64c9-42dd-809d-5ae8991fbd13.json

+[
+  {
+    "model": "workflows.abstractwidget", 
+    "fields": {
+      "category": "01ad639d-acb8-45c0-bc5e-bc8739bb4c95", 
+      "treeview_image": "", 
+      "uid": "f07ffb9c-64c9-42dd-809d-5ae8991fbd13", 
+      "windows_queue": false, 
+      "package": "base", 
+      "interaction_view": "base_js_snippet", 
+      "has_progress_bar": false, 
+      "image": "", 
+      "description": "", 
+      "static_image": "", 
+      "action": "base_js_snippet", 
+      "visualization_view": "", 
+      "streaming_visualization_view": "", 
+      "post_interact_action": "base_js_snippet_finished", 
+      "wsdl_method": "", 
+      "wsdl": "", 
+      "interactive": true, 
+      "is_streaming": false, 
+      "order": 1, 
+      "name": "Javascript Snippet"
+    }
+  }, 
+  {
+    "model": "workflows.abstractinput", 
+    "fields": {
+      "widget": "f07ffb9c-64c9-42dd-809d-5ae8991fbd13", 
+      "name": "Input", 
+      "short_name": "in", 
+      "default": "", 
+      "description": "Input", 
+      "required": false, 
+      "multi": true, 
+      "parameter_type": null, 
+      "variable": "in", 
+      "parameter": false, 
+      "order": 1, 
+      "uid": "7a0d740b-e669-4ff3-b688-0f86ee591b4f"
+    }
+  }, 
+  {
+    "model": "workflows.abstractinput", 
+    "fields": {
+      "widget": "f07ffb9c-64c9-42dd-809d-5ae8991fbd13", 
+      "name": "Snippet", 
+      "short_name": "snp", 
+      "default": "/*\r\n Access input objects using the inputs array.\r\n Assign the result to the out variable.\r\n\r\n Useful for manipulating simple objects, such as lists, strings and dictionaries.\r\n*/\r\nvar out = inputs[0];", 
+      "description": "Snippet", 
+      "required": false, 
+      "multi": false, 
+      "parameter_type": "textarea", 
+      "variable": "snippet", 
+      "parameter": true, 
+      "order": 2, 
+      "uid": "9d42c5b3-6961-47ea-a756-91cad1ba8da0"
+    }
+  }, 
+  {
+    "model": "workflows.abstractoutput", 
+    "fields": {
+      "widget": "f07ffb9c-64c9-42dd-809d-5ae8991fbd13", 
+      "name": "Output", 
+      "short_name": "out", 
+      "description": "Output", 
+      "variable": "out", 
+      "order": 1, 
+      "uid": "497da2eb-9590-47d8-84ba-1d3b38559bdf"
+    }
+  }
+]
\ No newline at end of file

workflows/base/templates/interactions/base_js_snippet.html

+<div id="widgetinteract-{{widget.pk}}" rel="{{widget.pk}}" class="widgetinteractdialog" title="{{widget.name}} interaction">
+
+    <p>Running code, yo.</p>
+
+    <form id="widget-form-{{widget.pk}}">
+        <input id="out-{{widget.pk}}" type="hidden" name="out"/>
+        <input type="hidden" name="widget_id" value="{{widget.pk}}"/>
+    </form>
+
+    <!-- Behaviour -->
+    <script type="text/javascript">
+        function execCode() {
+            var inputs = {{ inputs|safe }};
+            
+            {{ snippet|safe }}
+
+            // To ensure that `out` is always json-serializable, always add it to a list
+            out = [out];
+            $('#out-{{widget.pk}}').val(JSON.stringify(out));
+
+            // Finish interaction after the code executes
+            $("#widgetinteract-{{widget.pk}}").parent().find('button').click();
+        };
+
+        setTimeout(execCode, 500);
+    </script>
+</div>