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"""Module that pre-processes the notebook for export to HTML.
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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 io
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from pygments.formatters import HtmlFormatter
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from IPython.utils import path
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from .base import Transformer
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from IPython.utils.traitlets import Unicode
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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class CSSHTMLHeaderTransformer(Transformer):
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"""
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Transformer used to pre-process notebook for HTML output. Adds IPython notebook
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front-end CSS and Pygments CSS to HTML output.
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"""
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header = []
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highlight_class = Unicode('.highlight', config=True,
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help="CSS highlight class identifier")
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def __init__(self, config=None, **kw):
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"""
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Public constructor
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Parameters
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----------
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config : Config
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Configuration file structure
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**kw : misc
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Additional arguments
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"""
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super(CSSHTMLHeaderTransformer, self).__init__(config=config, **kw)
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if self.enabled :
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self._regen_header()
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def transform(self, nb, resources):
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"""Fetch and add CSS to the resource dictionary
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Fetch CSS from IPython and Pygments to add at the beginning
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of the html files. Add this css in resources in the
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"inlining.css" key
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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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transformers to pass variables into the Jinja engine.
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"""
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resources['inlining'] = {}
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resources['inlining']['css'] = self.header
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return nb, resources
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def _regen_header(self):
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"""
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Fills self.header with lines of CSS extracted from IPython
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and Pygments.
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"""
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#Clear existing header.
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header = []
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#Construct path to IPy CSS
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sheet_filename = os.path.join(path.get_ipython_package_dir(),
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'html', 'static', 'style', 'style.min.css')
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#Load style CSS file.
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with io.open(sheet_filename, encoding='utf-8') as file:
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file_text = file.read()
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header.append(file_text)
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#Add pygments CSS
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formatter = HtmlFormatter()
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pygments_css = formatter.get_style_defs(self.highlight_class)
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header.append(pygments_css)
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#Set header
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self.header = header
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