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579 lines
22 KiB
579 lines
22 KiB
#!/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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import asyncio
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from textwrap import fill, dedent
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from ipython_genutils.text import indent
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from jupyter_core.application import JupyterApp, base_aliases, base_flags
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from traitlets.config import catch_config_error, Configurable
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from traitlets import (
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Unicode, List, Instance, DottedObjectName, Type, Bool,
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default, observe,
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)
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from traitlets.utils.importstring import import_item
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from .exporters.base import get_export_names, get_exporter
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from nbconvert import exporters, preprocessors, writers, postprocessors, __version__
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from .utils.base import NbConvertBase
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from .utils.exceptions import ConversionException
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from .utils.io import unicode_stdin_stream
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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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"""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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"""
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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().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_name',
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'template-file' : '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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'output-dir': 'FilesWriter.build_directory',
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'reveal-prefix': 'SlidesExporter.reveal_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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'allow-errors' : (
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{'ExecutePreprocessor' : {'allow_errors' : True}},
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("Continue notebook execution even if one of the cells throws "
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"an error and include the error message in the cell output "
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"(the default behaviour is to abort conversion). This flag "
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"is only relevant if '--execute' was specified, too.")
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),
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'stdin' : (
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{'NbConvertApp' : {
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'from_stdin' : True,
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}
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},
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"read a single notebook file from stdin. Write the resulting notebook with default basename 'notebook.*'"
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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' : {
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'use_output_suffix' : False,
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'export_format' : 'notebook',
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},
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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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'clear-output' : (
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{
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'NbConvertApp' : {
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'use_output_suffix' : False,
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'export_format' : 'notebook',
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},
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'FilesWriter' : {'build_directory': ''},
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'ClearOutputPreprocessor' : {'enabled' : True},
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},
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"""Clear output of current file and save in place,
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overwriting the existing notebook. """
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),
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'no-prompt' : (
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{'TemplateExporter' : {
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'exclude_input_prompt' : True,
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'exclude_output_prompt' : True,
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}
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},
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"Exclude input and output prompts from converted document."
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),
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'no-input' : (
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{'TemplateExporter' : {
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'exclude_output_prompt' : True,
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'exclude_input': True,
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}
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},
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"""Exclude input cells and output prompts from converted document.
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This mode is ideal for generating code-free reports."""
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),
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'allow-chromium-download' : (
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{'WebPDFExporter' : {
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'allow_chromium_download' : True,
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}
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},
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"""Whether to allow downloading chromium if no suitable version is found on the system."""
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),
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})
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class NbConvertApp(JupyterApp):
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"""Application used to convert from notebook file type (``*.ipynb``)"""
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version = __version__
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name = 'jupyter-nbconvert'
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aliases = nbconvert_aliases
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flags = nbconvert_flags
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@default('log_level')
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def _log_level_default(self):
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return logging.INFO
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classes = List()
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@default('classes')
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def _classes_default(self):
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classes = [NbConvertBase]
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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('', 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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''').tag(config=True)
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use_output_suffix = Bool(
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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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).tag(config=True)
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output_files_dir = Unicode('{notebook_name}_files',
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help='''Directory to copy extra files (figures) to.
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'{notebook_name}' in the string will be converted to notebook
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basename.'''
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).tag(config=True)
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examples = Unicode(u"""
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The simplest way to use nbconvert is
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> jupyter nbconvert mynotebook.ipynb --to html
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Options include {formats}.
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> jupyter 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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> jupyter nbconvert --to html --template lab mynotebook.ipynb
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You can also pipe the output to stdout, rather than a file
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> jupyter nbconvert mynotebook.ipynb --stdout
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PDF is generated via latex
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> jupyter nbconvert mynotebook.ipynb --to pdf
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You can get (and serve) a Reveal.js-powered slideshow
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> jupyter 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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> jupyter nbconvert notebook*.ipynb
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> jupyter 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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> jupyter nbconvert --config mycfg.py
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""".format(formats=get_export_names()))
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# Writer specific variables
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writer = Instance('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.""", allow_none=True)
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writer_class = DottedObjectName('FilesWriter',
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help="""Writer class used to write the
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results of the conversion""").tag(config=True)
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writer_aliases = {'fileswriter': 'nbconvert.writers.files.FilesWriter',
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'debugwriter': 'nbconvert.writers.debug.DebugWriter',
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'stdoutwriter': 'nbconvert.writers.stdout.StdoutWriter'}
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writer_factory = Type(allow_none=True)
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@observe('writer_class')
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def _writer_class_changed(self, change):
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new = change['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('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.""", allow_none=True)
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postprocessor_class = DottedOrNone(
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help="""PostProcessor class used to write the
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results of the conversion"""
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).tag(config=True)
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postprocessor_aliases = {'serve': 'nbconvert.postprocessors.serve.ServePostProcessor'}
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postprocessor_factory = Type(None, allow_none=True)
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@observe('postprocessor_class')
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def _postprocessor_class_changed(self, change):
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new = change['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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jupyter_widgets_base_url = Unicode("https://unpkg.com/",
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help="URL base for Jupyter widgets").tag(config=True)
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html_manager_semver_range = Unicode('*',
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help="Semver range for Jupyter widgets HTML manager").tag(config=True)
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export_format = Unicode(
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allow_none=False,
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help="""The export format to be used, either one of the built-in formats
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{formats}
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or a dotted object name that represents the import path for an
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`Exporter` class""".format(formats=get_export_names())
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).tag(config=True)
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notebooks = List([], 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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).tag(config=True)
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from_stdin = Bool(False, help="read a single notebook from stdin.").tag(config=True)
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@catch_config_error
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def initialize(self, argv=None):
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"""Initialize application, notebooks, writer, and postprocessor"""
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# See https://bugs.python.org/issue37373 :(
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if sys.version_info[0] == 3 and sys.version_info[1] >= 8 and sys.platform.startswith('win'):
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asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
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self.init_syspath()
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super().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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"""Add the cwd to the sys.path ($PYTHONPATH)"""
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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 (rather than add) 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
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# adds) 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.warning("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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"""Initialize the writer (which is stateless)"""
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self._writer_class_changed({ 'new': 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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"""Initialize the postprocessor (which is stateless)"""
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self._postprocessor_class_changed({'new': 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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"""Run start after initialization process has completed"""
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super().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 initializes the resources dictionary for a single notebook.
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Returns
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-------
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dict
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resources dictionary for a single notebook that MUST include the following keys:
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- config_dir: the location of the Jupyter config directory
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- unique_key: the notebook name
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- output_files_dir: a directory where output files (not
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including the notebook itself) should be saved
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"""
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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 Basename.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['config_dir'] = self.config_dir
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resources['unique_key'] = notebook_name
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output_files_dir = (self.output_files_dir
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.format(notebook_name=notebook_name))
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resources['output_files_dir'] = output_files_dir
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resources['jupyter_widgets_base_url'] = self.jupyter_widgets_base_url
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resources['html_manager_semver_range'] = self.html_manager_semver_range
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return resources
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def export_single_notebook(self, notebook_filename, resources, input_buffer=None):
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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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Parameters
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----------
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notebook_filename : str
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name of notebook file.
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resources : dict
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input_buffer :
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readable file-like object returning unicode.
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if not None, notebook_filename is ignored
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Returns
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-------
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output
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dict
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resources (possibly modified)
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"""
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try:
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if input_buffer is not None:
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output, resources = self.exporter.from_file(input_buffer, resources=resources)
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else:
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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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Parameters
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----------
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output :
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resources : dict
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resources for a single notebook including name, config directory
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and directory to save output
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Returns
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-------
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file
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results from the specified writer output of exporter
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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: Post-process the written file
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Only used if a postprocessor has been specified. After the
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converted notebook is written to a file in Step 3, this post-processes
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the notebook.
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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, input_buffer=None):
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"""Convert a single notebook.
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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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Parameters
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----------
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notebook_filename : str
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input_buffer :
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If input_buffer is not None, conversion is done and the buffer is
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used as source into a file basenamed by the notebook_filename
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argument.
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"""
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if input_buffer is None:
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self.log.info("Converting notebook %s to %s", notebook_filename, self.export_format)
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else:
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self.log.info("Converting notebook into %s", 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, input_buffer=input_buffer)
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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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"""Convert the notebooks in the self.notebook traitlet """
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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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# no notebooks to convert!
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if len(self.notebooks) == 0 and not self.from_stdin:
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self.print_help()
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sys.exit(-1)
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if not self.export_format:
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raise ValueError(
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"Please specify an output format with '--to <format>'."
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f"\nThe following formats are available: {get_export_names()}"
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)
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# initialize the exporter
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cls = get_exporter(self.export_format)
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self.exporter = cls(config=self.config)
|
|
|
|
# convert each notebook
|
|
if not self.from_stdin:
|
|
for notebook_filename in self.notebooks:
|
|
self.convert_single_notebook(notebook_filename)
|
|
else:
|
|
input_buffer = unicode_stdin_stream()
|
|
# default name when conversion from stdin
|
|
self.convert_single_notebook("notebook.ipynb", input_buffer=input_buffer)
|
|
|
|
def document_flag_help(self):
|
|
"""
|
|
Return a string containing descriptions of all the flags.
|
|
"""
|
|
flags = "The following flags are defined:\n\n"
|
|
for flag, (cfg, fhelp) in self.flags.items():
|
|
flags += "{}\n".format(flag)
|
|
flags += indent(fill(fhelp, 80)) + '\n\n'
|
|
flags += indent(fill("Long Form: "+str(cfg), 80)) + '\n\n'
|
|
return flags
|
|
|
|
def document_alias_help(self):
|
|
"""Return a string containing all of the aliases"""
|
|
|
|
aliases = "The folowing aliases are defined:\n\n"
|
|
for alias, longname in self.aliases.items():
|
|
aliases += "\t**{}** ({})\n\n".format(alias, longname)
|
|
return aliases
|
|
|
|
def document_config_options(self):
|
|
"""
|
|
Provides a much improves version of the configuration documentation by
|
|
breaking the configuration options into app, exporter, writer,
|
|
preprocessor, postprocessor, and other sections.
|
|
"""
|
|
categories = {category: [c for c in self._classes_inc_parents() if category in c.__name__.lower()]
|
|
for category in ['app', 'exporter', 'writer', 'preprocessor', 'postprocessor']}
|
|
accounted_for = {c for category in categories.values() for c in category}
|
|
categories['other']= [c for c in self._classes_inc_parents() if c not in accounted_for]
|
|
|
|
header = dedent("""
|
|
{section} Options
|
|
-----------------------
|
|
|
|
""")
|
|
sections = ""
|
|
for category in categories:
|
|
sections += header.format(section=category.title())
|
|
if category in ['exporter','preprocessor','writer']:
|
|
sections += ".. image:: _static/{image}_inheritance.png\n\n".format(image=category)
|
|
sections += '\n'.join(c.class_config_rst_doc() for c in categories[category])
|
|
|
|
return sections.replace(' : ',r' \: ')
|
|
|
|
#-----------------------------------------------------------------------------
|
|
# Main entry point
|
|
#-----------------------------------------------------------------------------
|
|
|
|
main = launch_new_instance = NbConvertApp.launch_instance
|