Fixed extract figure, rename from count to index

nbconvert.py

@@ -96,7 +96,12 b' class NbConvertApp(Application):'
         ipynb_file = (self.extra_args)[2]
 
         #Export
-        output, resources, exporter = export_by_name(ipynb_file, export_type)
+        return_value = export_by_name(ipynb_file, export_type)
+        if return_value is None:
+            print("Error: '%s' template not found." % export_type)
+            return
+        else:
+            (output, resources, exporter) = return_value 
         
         #TODO: Allow user to set output directory and file. 
         destination_filename = None
@@ -108,7 +113,7 b' class NbConvertApp(Application):'
             #be used to create the directory that the files will be exported
             #into.
             out_root = ipynb_file[:-6].replace('.', '_').replace(' ', '_')
-            destination_filename = os.path.join(out_root+'.'+exporter.fileext)
+            destination_filename = os.path.join(out_root+'.'+exporter.file_extension)
             
             destination_directory = out_root+'_files'
             if not os.path.exists(destination_directory):

nbconvert/api/basichtml.py

@@ -29,7 +29,7 b' class BasicHtmlExporter(exporter.Exporter):'
     """
     Exports a basic HTML document.  This exporter assists with the export of
     HTML.  Inherit from it if you are writing your own HTML template and need
-    custom tranformers/filters.  If you don't need custom tranformers/
+    custom transformers/filters.  If you don't need custom transformers/
     filters, just change the 'template_file' config option.  
     """
     

nbconvert/transformers/extractfigure.py

@@ -46,7 +46,7 b' class ExtractFigureTransformer(ActivatableTransformer):'
     display_data_priority = List(['svg', 'png', 'latex', 'jpg', 'jpeg','text'])
 
     #TODO: Change this to .format {} syntax
-    default_key_template = Unicode('_fig_{count:02d}.{ext}', config=True)
+    default_key_template = Unicode('_fig_{index:02d}.{ext}', config=True)
 
     def cell_transform(self, cell, resources, index):
         """
@@ -104,9 +104,8 b' class ExtractFigureTransformer(ActivatableTransformer):'
         ----------
         data : str
             Cell data (from Notebook node cell)
-        resources : dictionary
-            Additional resources used in the conversion process.  Allows
-            transformers to pass variables into the Jinja engine.
+        format : str
+            Figure format
         index : int
             Modified index of the cell being processed (see base.py)
         """