Merge pull request #3879 from starcruiseromega/exporters

Get the list of exporters from entrypoints

notebook/services/nbconvert/handlers.py

@@ -4,18 +4,32 @@ from tornado import web
 
 from ...base.handlers import APIHandler
 
+
 class NbconvertRootHandler(APIHandler):
 
     @web.authenticated
     def get(self):
         try:
-            from nbconvert.exporters.export import exporter_map
+            from nbconvert.exporters import base
         except ImportError as e:
             raise web.HTTPError(500, "Could not import nbconvert: %s" % e)
         res = {}
-        for format, exporter in exporter_map.items():
+        exporters = base.get_export_names()
-            res[format] = info = {}
+        for exporter_name in exporters:
-            info['output_mimetype'] = exporter.output_mimetype
+            try:
+                exporter_class = base.get_exporter(exporter_name)
+            except ValueError:
+                # I think the only way this will happen is if the entrypoint
+                # is uninstalled while this method is running
+                continue
+            # XXX: According to the docs, it looks like this should be set to None
+            # if the exporter shouldn't be exposed to the front-end and a friendly
+            # name if it should. However, none of the built-in exports have it defined.
+            # if not exporter_class.export_from_notebook:
+            #    continue
+            res[exporter_name] = {
+                "output_mimetype": exporter_class.output_mimetype,
+            }
 
         self.finish(json.dumps(res))