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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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#-----------------------------------------------------------------------------
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#Copyright (c) 2013, the IPython Development Team.
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#
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#Distributed under the terms of the Modified BSD License.
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#
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#The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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#Imports
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#-----------------------------------------------------------------------------
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#Stdlib imports
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from __future__ import print_function
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import sys
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import os
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import glob
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#From IPython
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from IPython.core.application import BaseIPythonApplication, base_aliases, base_flags
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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,
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)
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from IPython.utils.importstring import import_item
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from .exporters.export import export_by_name, get_export_names, ExporterNameError
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from IPython.nbconvert import exporters, transformers, writers
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from .utils.base import NbConvertBase
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#-----------------------------------------------------------------------------
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#Classes and functions
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#-----------------------------------------------------------------------------
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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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'format' : 'NbConvertApp.export_format',
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'notebooks' : 'NbConvertApp.notebooks',
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'writer' : 'NbConvertApp.writer_class',
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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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'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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})
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class NbConvertApp(BaseIPythonApplication):
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"""Application used to convert to and 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 _classes_default(self):
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classes = [NbConvertBase]
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for pkg in (exporters, transformers, writers):
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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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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 `--format`.
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Options include {0}
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> ipython nbconvert --format latex mynotebook.ipnynb
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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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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 in self.writer_aliases:
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new = self.writer_aliases[new]
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self.writer_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="full_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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super(NbConvertApp, self).initialize(argv)
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self.init_notebooks()
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self.init_writer()
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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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for filename in glob.glob(pattern):
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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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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 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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#Export each notebook
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conversion_success = 0
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for notebook_filename in self.notebooks:
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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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resources = {}
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resources['unique_key'] = notebook_name
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#Try to export
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try:
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output, resources = export_by_name(self.export_format,
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notebook_filename,
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resources=resources,
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config=self.config)
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except ExporterNameError as e:
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print("Error: '%s' exporter not found." % self.export_format,
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file=sys.stderr)
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print("Known exporters are:",
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"\n\t" + "\n\t".join(get_export_names()),
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file=sys.stderr)
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sys.exit(-1)
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#except Exception as e:
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#print("Error: could not export '%s'" % notebook_filename, file=sys.stderr)
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#print(e, file=sys.stderr)
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else:
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self.writer.write(output, resources, notebook_name=notebook_name)
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conversion_success += 1
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#If nothing was converted successfully, help the user.
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if conversion_success == 0:
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#No notebooks were specified, show help.
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if len(self.notebooks) == 0:
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self.print_help()
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#Notebooks were specified, but not converted successfully. Show how
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#to access help.
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else:
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print('For help, use "ipython nbconvert --help"')
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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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