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beamer.py
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beamer.py
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"""LaTeX Exporter class"""
# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
import os
from traitlets import Unicode, default
from traitlets.config import Config
from copy import deepcopy
from nbconvert.filters.highlight import Highlight2Latex
from nbconvert.filters.filter_links import resolve_references
from nbconvert.exporters.templateexporter import TemplateExporter
def prepare(nb):
"""Add some convenience metadata on cells for the slide template."""
nb = deepcopy(nb)
for cell in nb.cells:
# Make sure every cell has a slide_type
cell.metadata.slide_type = cell.metadata.get(
'slideshow', {}).get('slide_type', '-')
# Find the first visible cell
for index, cell in enumerate(nb.cells):
if cell.metadata.slide_type not in {'notes', 'skip'}:
cell.metadata.slide_type = 'slide'
cell.metadata.slide_start = True
cell.metadata.subslide_start = True
first_slide_ix = index
break
else:
raise ValueError("All cells are hidden, cannot create slideshow")
in_fragment = False
for index, cell in enumerate(nb.cells[first_slide_ix+1:],
start=(first_slide_ix+1)):
previous_cell = nb.cells[index - 1]
# Get the slide type. If type is subslide or slide,
# end the last slide/subslide/fragment as applicable.
if cell.metadata.slide_type == 'slide':
previous_cell.metadata.slide_end = True
cell.metadata.slide_start = True
if cell.metadata.slide_type in {'subslide', 'slide'}:
previous_cell.metadata.fragment_end = in_fragment
previous_cell.metadata.subslide_end = True
cell.metadata.subslide_start = True
in_fragment = False
elif cell.metadata.slide_type == 'fragment':
cell.metadata.fragment_start = True
if in_fragment:
previous_cell.metadata.fragment_end = True
else:
in_fragment = True
if cell.metadata.get('cell_style') == 'split':
cell.metadata.split = True
# The last cell will always be the end of a slide
nb.cells[-1].metadata.fragment_end = in_fragment
nb.cells[-1].metadata.subslide_end = True
nb.cells[-1].metadata.slide_end = True
return nb
class BeamerExporter(TemplateExporter):
"""
Exports to a Latex template. Inherit from this class
if your template is LaTeX based and you need custom
tranformers/filters.
Inherit from it if you are writing your own HTML template
and need custom tranformers/filters.
If you don't need custom tranformers/filters, just change the
'template_file' config option. Place your template in the
special "/latex" subfolder of the "../templates" folder.
"""
@default('file_extension')
def _file_extension_default(self):
return '.tex'
@default('template_file')
def _template_file_default(self):
return 'article'
# Latex constants
@default('default_template_path')
def _default_template_path_default(self):
return os.path.join("..", "templates", "latex")
@default('template_skeleton_path')
def _template_skeleton_path_default(self):
return os.path.join("..", "templates", "latex", "skeleton")
# Extension that the template files use.
template_extension = Unicode(".tplx").tag(config=True)
output_mimetype = 'text/latex'
def default_filters(self):
for x in super(BeamerExporter, self).default_filters():
yield x
yield ('resolve_references', resolve_references)
@property
def default_config(self):
c = Config({
'NbConvertBase': {
'display_data_priority': ['text/latex',
'application/pdf',
'image/png',
'image/jpeg',
'image/svg+xml',
'text/markdown',
'text/plain']
},
'ExtractOutputPreprocessor': {
'enabled': True
},
'SVG2PDFPreprocessor': {
'enabled': True
},
'LatexPreprocessor': {
'enabled': True
},
'SphinxPreprocessor': {
'enabled': True
},
'HighlightMagicsPreprocessor': {
'enabled': True
}
})
c.merge(super(BeamerExporter, self).default_config)
return c
def from_notebook_node(self, nb, resources=None, **kw):
langinfo = nb.metadata.get('language_info', {})
lexer = langinfo.get('pygments_lexer', langinfo.get('name',
None))
self.register_filter('highlight_code',
Highlight2Latex(pygments_lexer=lexer,
parent=self))
return super(BeamerExporter, self).from_notebook_node(nb,
resources,
**kw)
def _create_environment(self):
environment = super(BeamerExporter, self)._create_environment()
# Set special Jinja2 syntax that will not conflict with latex.
environment.block_start_string = "((*"
environment.block_end_string = "*))"
environment.variable_start_string = "((("
environment.variable_end_string = ")))"
environment.comment_start_string = "((="
environment.comment_end_string = "=))"
return environment

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