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