|
|
"""This module defines TemplateExporter, a highly configurable converter
|
|
|
that uses Jinja2 to export notebook files into different formats.
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# 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 __future__ import print_function, absolute_import
|
|
|
|
|
|
# Stdlib imports
|
|
|
import os
|
|
|
|
|
|
# other libs/dependencies are imported at runtime
|
|
|
# to move ImportErrors to runtime when the requirement is actually needed
|
|
|
|
|
|
# IPython imports
|
|
|
from IPython.utils.traitlets import MetaHasTraits, Unicode, List, Dict, Any
|
|
|
from IPython.utils.importstring import import_item
|
|
|
from IPython.utils import py3compat, text
|
|
|
|
|
|
from IPython.nbformat.current import docstring_nbformat_mod
|
|
|
from IPython.nbconvert import filters
|
|
|
from .exporter import Exporter
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Globals and constants
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#Jinja2 extensions to load.
|
|
|
JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
|
|
|
|
|
|
default_filters = {
|
|
|
'indent': text.indent,
|
|
|
'markdown2html': filters.markdown2html,
|
|
|
'ansi2html': filters.ansi2html,
|
|
|
'filter_data_type': filters.DataTypeFilter,
|
|
|
'get_lines': filters.get_lines,
|
|
|
'highlight2html': filters.Highlight2Html,
|
|
|
'highlight2latex': filters.Highlight2Latex,
|
|
|
'ipython2python': filters.ipython2python,
|
|
|
'posix_path': filters.posix_path,
|
|
|
'markdown2latex': filters.markdown2latex,
|
|
|
'markdown2rst': filters.markdown2rst,
|
|
|
'comment_lines': filters.comment_lines,
|
|
|
'strip_ansi': filters.strip_ansi,
|
|
|
'strip_dollars': filters.strip_dollars,
|
|
|
'strip_files_prefix': filters.strip_files_prefix,
|
|
|
'html2text' : filters.html2text,
|
|
|
'add_anchor': filters.add_anchor,
|
|
|
'ansi2latex': filters.ansi2latex,
|
|
|
'wrap_text': filters.wrap_text,
|
|
|
'escape_latex': filters.escape_latex,
|
|
|
'citation2latex': filters.citation2latex,
|
|
|
'path2url': filters.path2url,
|
|
|
'add_prompts': filters.add_prompts,
|
|
|
'ascii_only': filters.ascii_only,
|
|
|
}
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class TemplateExporter(Exporter):
|
|
|
"""
|
|
|
Exports notebooks into other file formats. Uses Jinja 2 templating engine
|
|
|
to output new formats. Inherit from this class if you are creating a new
|
|
|
template type along with new filters/preprocessors. If the filters/
|
|
|
preprocessors provided by default suffice, there is no need to inherit from
|
|
|
this class. Instead, override the template_file and file_extension
|
|
|
traits via a config file.
|
|
|
|
|
|
{filters}
|
|
|
"""
|
|
|
|
|
|
# finish the docstring
|
|
|
__doc__ = __doc__.format(filters = '- '+'\n - '.join(default_filters.keys()))
|
|
|
|
|
|
|
|
|
template_file = Unicode(u'default',
|
|
|
config=True,
|
|
|
help="Name of the template file to use")
|
|
|
def _template_file_changed(self, name, old, new):
|
|
|
if new == 'default':
|
|
|
self.template_file = self.default_template
|
|
|
else:
|
|
|
self.template_file = new
|
|
|
self.template = None
|
|
|
self._load_template()
|
|
|
|
|
|
default_template = Unicode(u'')
|
|
|
template = Any()
|
|
|
environment = Any()
|
|
|
|
|
|
template_path = List(['.'], config=True)
|
|
|
def _template_path_changed(self, name, old, new):
|
|
|
self._load_template()
|
|
|
|
|
|
default_template_path = Unicode(
|
|
|
os.path.join("..", "templates"),
|
|
|
help="Path where the template files are located.")
|
|
|
|
|
|
template_skeleton_path = Unicode(
|
|
|
os.path.join("..", "templates", "skeleton"),
|
|
|
help="Path where the template skeleton files are located.")
|
|
|
|
|
|
#Jinja block definitions
|
|
|
jinja_comment_block_start = Unicode("", config=True)
|
|
|
jinja_comment_block_end = Unicode("", config=True)
|
|
|
jinja_variable_block_start = Unicode("", config=True)
|
|
|
jinja_variable_block_end = Unicode("", config=True)
|
|
|
jinja_logic_block_start = Unicode("", config=True)
|
|
|
jinja_logic_block_end = Unicode("", config=True)
|
|
|
|
|
|
#Extension that the template files use.
|
|
|
template_extension = Unicode(".tpl", config=True)
|
|
|
|
|
|
filters = Dict(config=True,
|
|
|
help="""Dictionary of filters, by name and namespace, to add to the Jinja
|
|
|
environment.""")
|
|
|
|
|
|
raw_mimetypes = List(config=True,
|
|
|
help="""formats of raw cells to be included in this Exporter's output."""
|
|
|
)
|
|
|
def _raw_mimetypes_default(self):
|
|
|
return [self.output_mimetype, '']
|
|
|
|
|
|
|
|
|
def __init__(self, config=None, extra_loaders=None, **kw):
|
|
|
"""
|
|
|
Public constructor
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
config : config
|
|
|
User configuration instance.
|
|
|
extra_loaders : list[of Jinja Loaders]
|
|
|
ordered list of Jinja loader to find templates. Will be tried in order
|
|
|
before the default FileSystem ones.
|
|
|
template : str (optional, kw arg)
|
|
|
Template to use when exporting.
|
|
|
"""
|
|
|
super(TemplateExporter, self).__init__(config=config, **kw)
|
|
|
|
|
|
#Init
|
|
|
self._init_template()
|
|
|
self._init_environment(extra_loaders=extra_loaders)
|
|
|
self._init_preprocessors()
|
|
|
self._init_filters()
|
|
|
|
|
|
|
|
|
def _load_template(self):
|
|
|
"""Load the Jinja template object from the template file
|
|
|
|
|
|
This is a no-op if the template attribute is already defined,
|
|
|
or the Jinja environment is not setup yet.
|
|
|
|
|
|
This is triggered by various trait changes that would change the template.
|
|
|
"""
|
|
|
from jinja2 import TemplateNotFound
|
|
|
|
|
|
if self.template is not None:
|
|
|
return
|
|
|
# called too early, do nothing
|
|
|
if self.environment is None:
|
|
|
return
|
|
|
# Try different template names during conversion. First try to load the
|
|
|
# template by name with extension added, then try loading the template
|
|
|
# as if the name is explicitly specified, then try the name as a
|
|
|
# 'flavor', and lastly just try to load the template by module name.
|
|
|
try_names = []
|
|
|
if self.template_file:
|
|
|
try_names.extend([
|
|
|
self.template_file + self.template_extension,
|
|
|
self.template_file,
|
|
|
])
|
|
|
for try_name in try_names:
|
|
|
self.log.debug("Attempting to load template %s", try_name)
|
|
|
try:
|
|
|
self.template = self.environment.get_template(try_name)
|
|
|
except (TemplateNotFound, IOError):
|
|
|
pass
|
|
|
except Exception as e:
|
|
|
self.log.warn("Unexpected exception loading template: %s", try_name, exc_info=True)
|
|
|
else:
|
|
|
self.log.info("Loaded template %s", try_name)
|
|
|
break
|
|
|
|
|
|
@docstring_nbformat_mod
|
|
|
def from_notebook_node(self, nb, resources=None, **kw):
|
|
|
"""
|
|
|
Convert a notebook from a notebook node instance.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
nb : :class:`~{nbformat_mod}.nbbase.NotebookNode`
|
|
|
Notebook node
|
|
|
resources : dict
|
|
|
Additional resources that can be accessed read/write by
|
|
|
preprocessors and filters.
|
|
|
"""
|
|
|
nb_copy, resources = super(TemplateExporter, self).from_notebook_node(nb, resources, **kw)
|
|
|
resources.setdefault('raw_mimetypes', self.raw_mimetypes)
|
|
|
|
|
|
self._load_template()
|
|
|
|
|
|
if self.template is not None:
|
|
|
output = self.template.render(nb=nb_copy, resources=resources)
|
|
|
else:
|
|
|
raise IOError('template file "%s" could not be found' % self.template_file)
|
|
|
return output, resources
|
|
|
|
|
|
|
|
|
def register_filter(self, name, jinja_filter):
|
|
|
"""
|
|
|
Register a filter.
|
|
|
A filter is a function that accepts and acts on one string.
|
|
|
The filters are accesible within the Jinja templating engine.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
name : str
|
|
|
name to give the filter in the Jinja engine
|
|
|
filter : filter
|
|
|
"""
|
|
|
if jinja_filter is None:
|
|
|
raise TypeError('filter')
|
|
|
isclass = isinstance(jinja_filter, type)
|
|
|
constructed = not isclass
|
|
|
|
|
|
#Handle filter's registration based on it's type
|
|
|
if constructed and isinstance(jinja_filter, py3compat.string_types):
|
|
|
#filter is a string, import the namespace and recursively call
|
|
|
#this register_filter method
|
|
|
filter_cls = import_item(jinja_filter)
|
|
|
return self.register_filter(name, filter_cls)
|
|
|
|
|
|
if constructed and hasattr(jinja_filter, '__call__'):
|
|
|
#filter is a function, no need to construct it.
|
|
|
self.environment.filters[name] = jinja_filter
|
|
|
return jinja_filter
|
|
|
|
|
|
elif isclass and isinstance(jinja_filter, MetaHasTraits):
|
|
|
#filter is configurable. Make sure to pass in new default for
|
|
|
#the enabled flag if one was specified.
|
|
|
filter_instance = jinja_filter(parent=self)
|
|
|
self.register_filter(name, filter_instance )
|
|
|
|
|
|
elif isclass:
|
|
|
#filter is not configurable, construct it
|
|
|
filter_instance = jinja_filter()
|
|
|
self.register_filter(name, filter_instance)
|
|
|
|
|
|
else:
|
|
|
#filter is an instance of something without a __call__
|
|
|
#attribute.
|
|
|
raise TypeError('filter')
|
|
|
|
|
|
|
|
|
def _init_template(self):
|
|
|
"""
|
|
|
Make sure a template name is specified. If one isn't specified, try to
|
|
|
build one from the information we know.
|
|
|
"""
|
|
|
self._template_file_changed('template_file', self.template_file, self.template_file)
|
|
|
|
|
|
|
|
|
def _init_environment(self, extra_loaders=None):
|
|
|
"""
|
|
|
Create the Jinja templating environment.
|
|
|
"""
|
|
|
from jinja2 import Environment, ChoiceLoader, FileSystemLoader
|
|
|
here = os.path.dirname(os.path.realpath(__file__))
|
|
|
loaders = []
|
|
|
if extra_loaders:
|
|
|
loaders.extend(extra_loaders)
|
|
|
|
|
|
paths = self.template_path
|
|
|
paths.extend([os.path.join(here, self.default_template_path),
|
|
|
os.path.join(here, self.template_skeleton_path)])
|
|
|
loaders.append(FileSystemLoader(paths))
|
|
|
|
|
|
self.environment = Environment(
|
|
|
loader= ChoiceLoader(loaders),
|
|
|
extensions=JINJA_EXTENSIONS
|
|
|
)
|
|
|
|
|
|
#Set special Jinja2 syntax that will not conflict with latex.
|
|
|
if self.jinja_logic_block_start:
|
|
|
self.environment.block_start_string = self.jinja_logic_block_start
|
|
|
if self.jinja_logic_block_end:
|
|
|
self.environment.block_end_string = self.jinja_logic_block_end
|
|
|
if self.jinja_variable_block_start:
|
|
|
self.environment.variable_start_string = self.jinja_variable_block_start
|
|
|
if self.jinja_variable_block_end:
|
|
|
self.environment.variable_end_string = self.jinja_variable_block_end
|
|
|
if self.jinja_comment_block_start:
|
|
|
self.environment.comment_start_string = self.jinja_comment_block_start
|
|
|
if self.jinja_comment_block_end:
|
|
|
self.environment.comment_end_string = self.jinja_comment_block_end
|
|
|
|
|
|
|
|
|
def _init_filters(self):
|
|
|
"""
|
|
|
Register all of the filters required for the exporter.
|
|
|
"""
|
|
|
|
|
|
#Add default filters to the Jinja2 environment
|
|
|
for key, value in default_filters.items():
|
|
|
self.register_filter(key, value)
|
|
|
|
|
|
#Load user filters. Overwrite existing filters if need be.
|
|
|
if self.filters:
|
|
|
for key, user_filter in self.filters.items():
|
|
|
self.register_filter(key, user_filter)
|
|
|
|
