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"""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
#-----------------------------------------------------------------------------
from .base import Transformer
from IPython.utils.traitlets import Unicode
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
class RevealHelpTransformer(Transformer):
url_prefix = Unicode('//cdn.jsdelivr.net/reveal.js/2.4.0',
config=True,
help="""If you want to use a local reveal.js library,
use 'url_prefix':'reveal.js' in your config object.""")
def call(self, nb, resources):
"""
Called once to 'transform' contents of the notebook.
Parameters
----------
nb : NotebookNode
Notebook being converted
resources : dictionary
Additional resources used in the conversion process. Allows
transformers 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 'reveal' not in resources:
resources['reveal'] = {}
resources['reveal']['url_prefix'] = self.url_prefix
return nb, resources
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