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#!/usr/bin/env python
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"""NbConvert is a utility for conversion of .ipynb files.
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Command-line interface for the NbConvert conversion utility.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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import logging
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import sys
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import os
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import glob
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from IPython.core.application import BaseIPythonApplication, base_aliases, base_flags
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from IPython.core.profiledir import ProfileDir
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from IPython.config import catch_config_error, Configurable
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from IPython.utils.traitlets import (
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Unicode, List, Instance, DottedObjectName, Type, CaselessStrEnum, Bool,
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)
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from IPython.utils.importstring import import_item
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from .exporters.export import get_export_names, exporter_map
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from IPython.nbconvert import exporters, preprocessors, writers, postprocessors
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from .utils.base import NbConvertBase
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from .utils.exceptions import ConversionException
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#-----------------------------------------------------------------------------
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#Classes and functions
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#-----------------------------------------------------------------------------
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class DottedOrNone(DottedObjectName):
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"""
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A string holding a valid dotted object name in Python, such as A.b3._c
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Also allows for None type."""
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default_value = u''
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def validate(self, obj, value):
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if value is not None and len(value) > 0:
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return super(DottedOrNone, self).validate(obj, value)
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else:
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return value
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nbconvert_aliases = {}
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nbconvert_aliases.update(base_aliases)
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nbconvert_aliases.update({
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'to' : 'NbConvertApp.export_format',
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'template' : 'TemplateExporter.template_file',
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'writer' : 'NbConvertApp.writer_class',
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'post': 'NbConvertApp.postprocessor_class',
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'output': 'NbConvertApp.output_base',
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'reveal-prefix': 'RevealHelpPreprocessor.url_prefix',
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'nbformat': 'NotebookExporter.nbformat_version',
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})
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nbconvert_flags = {}
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nbconvert_flags.update(base_flags)
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nbconvert_flags.update({
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'execute' : (
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{'ExecutePreprocessor' : {'enabled' : True}},
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"Execute the notebook prior to export."
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),
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'stdout' : (
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{'NbConvertApp' : {'writer_class' : "StdoutWriter"}},
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"Write notebook output to stdout instead of files."
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),
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'inplace' : (
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{
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'NbConvertApp' : {'use_output_suffix' : False},
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'FilesWriter': {'build_directory': ''}
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},
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"""Run nbconvert in place, overwriting the existing notebook (only
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relevant when converting to notebook format)"""
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)
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})
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class NbConvertApp(BaseIPythonApplication):
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"""Application used to convert from notebook file type (``*.ipynb``)"""
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name = 'ipython-nbconvert'
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aliases = nbconvert_aliases
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flags = nbconvert_flags
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def _log_level_default(self):
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return logging.INFO
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def _classes_default(self):
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classes = [NbConvertBase, ProfileDir]
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for pkg in (exporters, preprocessors, writers, postprocessors):
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for name in dir(pkg):
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cls = getattr(pkg, name)
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if isinstance(cls, type) and issubclass(cls, Configurable):
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classes.append(cls)
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return classes
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description = Unicode(
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u"""This application is used to convert notebook files (*.ipynb)
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to various other formats.
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WARNING: THE COMMANDLINE INTERFACE MAY CHANGE IN FUTURE RELEASES.""")
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output_base = Unicode('', config=True, help='''overwrite base name use for output files.
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can only be used when converting one notebook at a time.
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''')
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use_output_suffix = Bool(
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True,
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config=True,
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help="""Whether to apply a suffix prior to the extension (only relevant
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when converting to notebook format). The suffix is determined by
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the exporter, and is usually '.nbconvert'.""")
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examples = Unicode(u"""
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The simplest way to use nbconvert is
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> ipython nbconvert mynotebook.ipynb
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which will convert mynotebook.ipynb to the default format (probably HTML).
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You can specify the export format with `--to`.
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Options include {0}
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> ipython nbconvert --to latex mynotebook.ipynb
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Both HTML and LaTeX support multiple output templates. LaTeX includes
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'base', 'article' and 'report'. HTML includes 'basic' and 'full'. You
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can specify the flavor of the format used.
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> ipython nbconvert --to html --template basic mynotebook.ipynb
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You can also pipe the output to stdout, rather than a file
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> ipython nbconvert mynotebook.ipynb --stdout
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PDF is generated via latex
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> ipython nbconvert mynotebook.ipynb --to pdf
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You can get (and serve) a Reveal.js-powered slideshow
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> ipython nbconvert myslides.ipynb --to slides --post serve
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Multiple notebooks can be given at the command line in a couple of
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different ways:
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> ipython nbconvert notebook*.ipynb
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> ipython nbconvert notebook1.ipynb notebook2.ipynb
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or you can specify the notebooks list in a config file, containing::
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c.NbConvertApp.notebooks = ["my_notebook.ipynb"]
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> ipython nbconvert --config mycfg.py
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""".format(get_export_names()))
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# Writer specific variables
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writer = Instance('IPython.nbconvert.writers.base.WriterBase',
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help="""Instance of the writer class used to write the
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results of the conversion.""")
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writer_class = DottedObjectName('FilesWriter', config=True,
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help="""Writer class used to write the
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results of the conversion""")
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writer_aliases = {'fileswriter': 'IPython.nbconvert.writers.files.FilesWriter',
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'debugwriter': 'IPython.nbconvert.writers.debug.DebugWriter',
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'stdoutwriter': 'IPython.nbconvert.writers.stdout.StdoutWriter'}
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writer_factory = Type()
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def _writer_class_changed(self, name, old, new):
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if new.lower() in self.writer_aliases:
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new = self.writer_aliases[new.lower()]
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self.writer_factory = import_item(new)
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# Post-processor specific variables
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postprocessor = Instance('IPython.nbconvert.postprocessors.base.PostProcessorBase',
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help="""Instance of the PostProcessor class used to write the
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results of the conversion.""")
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postprocessor_class = DottedOrNone(config=True,
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help="""PostProcessor class used to write the
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results of the conversion""")
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postprocessor_aliases = {'serve': 'IPython.nbconvert.postprocessors.serve.ServePostProcessor'}
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postprocessor_factory = Type()
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def _postprocessor_class_changed(self, name, old, new):
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if new.lower() in self.postprocessor_aliases:
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new = self.postprocessor_aliases[new.lower()]
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if new:
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self.postprocessor_factory = import_item(new)
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# Other configurable variables
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export_format = CaselessStrEnum(get_export_names(),
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default_value="html",
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config=True,
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help="""The export format to be used."""
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)
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notebooks = List([], config=True, help="""List of notebooks to convert.
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Wildcards are supported.
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Filenames passed positionally will be added to the list.
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""")
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@catch_config_error
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def initialize(self, argv=None):
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self.init_syspath()
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super(NbConvertApp, self).initialize(argv)
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self.init_notebooks()
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self.init_writer()
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self.init_postprocessor()
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def init_syspath(self):
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"""
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Add the cwd to the sys.path ($PYTHONPATH)
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"""
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sys.path.insert(0, os.getcwd())
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def init_notebooks(self):
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"""Construct the list of notebooks.
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If notebooks are passed on the command-line,
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they override notebooks specified in config files.
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Glob each notebook to replace notebook patterns with filenames.
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"""
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# Specifying notebooks on the command-line overrides (rather than adds)
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# the notebook list
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if self.extra_args:
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patterns = self.extra_args
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else:
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patterns = self.notebooks
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# Use glob to replace all the notebook patterns with filenames.
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filenames = []
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for pattern in patterns:
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# Use glob to find matching filenames. Allow the user to convert
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# notebooks without having to type the extension.
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globbed_files = glob.glob(pattern)
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globbed_files.extend(glob.glob(pattern + '.ipynb'))
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if not globbed_files:
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self.log.warn("pattern %r matched no files", pattern)
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for filename in globbed_files:
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if not filename in filenames:
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filenames.append(filename)
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self.notebooks = filenames
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def init_writer(self):
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"""
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Initialize the writer (which is stateless)
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"""
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self._writer_class_changed(None, self.writer_class, self.writer_class)
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self.writer = self.writer_factory(parent=self)
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if hasattr(self.writer, 'build_directory') and self.writer.build_directory != '':
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self.use_output_suffix = False
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def init_postprocessor(self):
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"""
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Initialize the postprocessor (which is stateless)
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"""
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self._postprocessor_class_changed(None, self.postprocessor_class,
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self.postprocessor_class)
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if self.postprocessor_factory:
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self.postprocessor = self.postprocessor_factory(parent=self)
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def start(self):
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"""
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Ran after initialization completed
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"""
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super(NbConvertApp, self).start()
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self.convert_notebooks()
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def init_single_notebook_resources(self, notebook_filename):
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"""Step 1: Initialize resources
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This intializes the resources dictionary for a single notebook. This
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method should return the resources dictionary, and MUST include the
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following keys:
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- profile_dir: the location of the profile directory
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- unique_key: the notebook name
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- output_files_dir: a directory where output files (not including
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the notebook itself) should be saved
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"""
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# Get a unique key for the notebook and set it in the resources object.
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basename = os.path.basename(notebook_filename)
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notebook_name = basename[:basename.rfind('.')]
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if self.output_base:
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# strip duplicate extension from output_base, to avoid Basname.ext.ext
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if getattr(self.exporter, 'file_extension', False):
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base, ext = os.path.splitext(self.output_base)
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if ext == self.exporter.file_extension:
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self.output_base = base
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notebook_name = self.output_base
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self.log.debug("Notebook name is '%s'", notebook_name)
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# first initialize the resources we want to use
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resources = {}
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resources['profile_dir'] = self.profile_dir.location
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resources['unique_key'] = notebook_name
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resources['output_files_dir'] = '%s_files' % notebook_name
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return resources
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def export_single_notebook(self, notebook_filename, resources):
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"""Step 2: Export the notebook
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Exports the notebook to a particular format according to the specified
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exporter. This function returns the output and (possibly modified)
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resources from the exporter.
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"""
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try:
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output, resources = self.exporter.from_filename(notebook_filename, resources=resources)
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except ConversionException:
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self.log.error("Error while converting '%s'", notebook_filename, exc_info=True)
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self.exit(1)
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return output, resources
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def write_single_notebook(self, output, resources):
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"""Step 3: Write the notebook to file
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This writes output from the exporter to file using the specified writer.
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It returns the results from the writer.
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"""
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if 'unique_key' not in resources:
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raise KeyError("unique_key MUST be specified in the resources, but it is not")
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notebook_name = resources['unique_key']
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if self.use_output_suffix and not self.output_base:
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notebook_name += resources.get('output_suffix', '')
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write_results = self.writer.write(
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output, resources, notebook_name=notebook_name)
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return write_results
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def postprocess_single_notebook(self, write_results):
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"""Step 4: Postprocess the notebook
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This postprocesses the notebook after it has been written, taking as an
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argument the results of writing the notebook to file. This only actually
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does anything if a postprocessor has actually been specified.
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"""
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# Post-process if post processor has been defined.
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if hasattr(self, 'postprocessor') and self.postprocessor:
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self.postprocessor(write_results)
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def convert_single_notebook(self, notebook_filename):
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"""Convert a single notebook. Performs the following steps:
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1. Initialize notebook resources
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2. Export the notebook to a particular format
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3. Write the exported notebook to file
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4. (Maybe) postprocess the written file
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"""
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self.log.info("Converting notebook %s to %s", notebook_filename, self.export_format)
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resources = self.init_single_notebook_resources(notebook_filename)
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output, resources = self.export_single_notebook(notebook_filename, resources)
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write_results = self.write_single_notebook(output, resources)
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self.postprocess_single_notebook(write_results)
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def convert_notebooks(self):
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"""
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Convert the notebooks in the self.notebook traitlet
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"""
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# check that the output base isn't specified if there is more than
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# one notebook to convert
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if self.output_base != '' and len(self.notebooks) > 1:
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self.log.error(
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"""
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UsageError: --output flag or `NbConvertApp.output_base` config option
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cannot be used when converting multiple notebooks.
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"""
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)
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self.exit(1)
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# initialize the exporter
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self.exporter = exporter_map[self.export_format](config=self.config)
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# no notebooks to convert!
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if len(self.notebooks) == 0:
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self.print_help()
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sys.exit(-1)
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# convert each notebook
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for notebook_filename in self.notebooks:
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self.convert_single_notebook(notebook_filename)
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#-----------------------------------------------------------------------------
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# Main entry point
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#-----------------------------------------------------------------------------
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launch_new_instance = NbConvertApp.launch_instance
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