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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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Commandline interface for the NBConvert conversion utility. Read the
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readme.rst for usage information
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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
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from IPython.config.application import catch_config_error
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from IPython.utils.traitlets import Unicode, List, Instance, DottedObjectName, Type
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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 .exporters.exporter import Exporter
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from .writers.base import WriterBase
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from .utils.config import GlobalConfigurable
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#-----------------------------------------------------------------------------
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#Classes and functions
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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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description = Unicode(
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u"""This application is used to convert notebook files (*.ipynb).
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An ipython config file can be used to batch convert notebooks in the
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current directory.""")
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examples = Unicode(u"""
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Running `ipython nbconvert` will read the directory config file and then
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apply it to one or more notebooks.
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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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> ipython nbconvert # this will use the config file to fill in the notebooks
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""")
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config_file_name = Unicode(u'ipython_nbconvert_config.py')
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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 = Unicode(
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"", config=True,
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help="""If specified, nbconvert will convert the document(s) specified
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using this format.""")
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notebooks = List([], config=True, help="""List of notebooks to convert.
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Search patterns are supported.""")
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aliases = {'format':'NbConvertApp.export_format',
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'notebooks':'NbConvertApp.notebooks',
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'writer':'NbConvertApp.writer_class'}
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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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#Register class here to have help with help all
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self.classes.insert(0, Exporter)
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self.classes.insert(0, WriterBase)
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self.classes.insert(0, GlobalConfigurable)
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#Init
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self.init_config(self.extra_args)
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self.init_writer()
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def init_config(self, extra_args):
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"""
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Add notebooks to the config if needed. Glob each notebook to replace
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notebook patterns with filenames.
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"""
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#Get any additional notebook patterns from the commandline
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if len(extra_args) > 0:
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for pattern in extra_args:
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self.notebooks.append(pattern)
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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 self.notebooks:
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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, argv=None):
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"""
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Entrypoint of NbConvert application.
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"""
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#Call base
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super(NbConvertApp, self).start()
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#Export each notebook
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#TODO: Empty check
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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 no export '%s'" % notebook_filename, file=sys.stderr)
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print(e, file=sys.stderr)
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#Write
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self.writer.write(output, resources, notebook_name=notebook_name)
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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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