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