use local reveal.js url prefix by default

CDN redirect is handled by the Serve post-processor if necessary

IPython/nbconvert/preprocessors/revealhelp.py

@@ -1,67 +1,67 b''
 """Module that pre-processes the notebook for export via Reveal.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import os
 import urllib2
 
 from .base import Preprocessor
 from IPython.utils.traitlets import Unicode, Bool
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 class RevealHelpPreprocessor(Preprocessor):
 
-    url_prefix = Unicode('https://cdn.jsdelivr.net/reveal.js/2.4.0', config=True,
+    url_prefix = Unicode('reveal.js', config=True,
                          help="""The URL prefix for reveal.js.
                          This can be a a relative URL for a local copy of reveal.js,
                          or point to a CDN.
                          
-                         For speaker notes to work, a local reveal.js must be used.
+                         For speaker notes to work, a local reveal.js prefix must be used.
                          """
     )
 
     def preprocess(self, nb, resources):
         """
         Called once to 'preprocess' contents of the notebook.
 
         Parameters
         ----------
         nb : NotebookNode
             Notebook being converted
         resources : dictionary
             Additional resources used in the conversion process.  Allows
             preprocessors to pass variables into the Jinja engine.
         """
 
         for worksheet in nb.worksheets :
             for index, cell in enumerate(worksheet.cells):
 
                 #Make sure the cell has slideshow metadata.
                 cell.metadata.align_type = cell.get('metadata', {}).get('slideshow', {}).get('align_type', 'Left')
                 cell.metadata.slide_type = cell.get('metadata', {}).get('slideshow', {}).get('slide_type', '-')
 
                 #Get the slide type.  If type is start of subslide or slide,
                 #end the last subslide/slide.
                 if cell.metadata.slide_type in ['slide']:
                     worksheet.cells[index - 1].metadata.slide_helper = 'slide_end'
                 if cell.metadata.slide_type in ['subslide']:
                     worksheet.cells[index - 1].metadata.slide_helper = 'subslide_end'
 
 
         if not isinstance(resources['reveal'], dict):
             resources['reveal'] = {}
         resources['reveal']['url_prefix'] = self.url_prefix
         return nb, resources