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#!/usr/bin/env python
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"""Convert IPython notebooks to other formats, such as ReST, and HTML.
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Example:
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./nbconvert.py --format html file.ipynb
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Produces 'file.rst' and 'file.html', along with auto-generated figure files
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called nb_figure_NN.png. To avoid the two-step process, ipynb -> rst -> html,
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use '--format quick-html' which will do ipynb -> html, but won't look as
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pretty.
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"""
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from __future__ import print_function
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import codecs
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import os
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import pprint
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import re
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import subprocess
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import sys
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from IPython.external import argparse
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from IPython.nbformat import current as nbformat
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from IPython.utils.text import indent
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from decorators import DocInherit
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def remove_ansi(src):
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"""Strip all ANSI color escape sequences from input string.
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Parameters
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----------
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src : string
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Returns
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-------
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string
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"""
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return re.sub(r'\033\[(0|\d;\d\d)m', '', src)
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# Pandoc-dependent code
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def markdown2latex(src):
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"""Convert a markdown string to LaTeX via pandoc.
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This function will raise an error if pandoc is not installed.
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Any error messages generated by pandoc are printed to stderr.
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Parameters
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----------
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src : string
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Input string, assumed to be valid markdown.
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Returns
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-------
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out : string
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Output as returned by pandoc.
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"""
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p = subprocess.Popen('pandoc -f markdown -t latex'.split(),
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stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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out, err = p.communicate(src)
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if err:
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print(err, file=sys.stderr)
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#print('*'*20+'\n', out, '\n'+'*'*20) # dbg
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return out
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# Cell converters
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def rst_directive(directive, text=''):
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out = [directive, '']
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if text:
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out.extend([indent(text), ''])
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return out
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# Converters for parts of a cell.
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class ConversionException(Exception):
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pass
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class Converter(object):
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default_encoding = 'utf-8'
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extension = str()
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figures_counter = 0
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infile = str()
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infile_dir = str()
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infile_root = str()
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files_dir = str()
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with_preamble = True
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user_preamble = None
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output = str()
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def __init__(self, infile):
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self.infile = infile
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self.infile_dir = os.path.dirname(infile)
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infile_root = os.path.splitext(infile)[0]
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files_dir = infile_root + '_files'
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if not os.path.isdir(files_dir):
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os.mkdir(files_dir)
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self.infile_root = infile_root
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self.files_dir = files_dir
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def dispatch(self, cell_type):
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"""return cell_type dependent render method, for example render_code
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"""
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return getattr(self, 'render_' + cell_type, self.render_unknown)
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def convert(self):
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lines = []
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lines.extend(self.optional_header())
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for worksheet in self.nb.worksheets:
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for cell in worksheet.cells:
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conv_fn = self.dispatch(cell.cell_type)
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lines.extend(conv_fn(cell))
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lines.append('')
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lines.extend(self.optional_footer())
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return '\n'.join(lines)
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def render(self):
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"read, convert, and save self.infile"
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self.read()
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self.output = self.convert()
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return self.save()
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def read(self):
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"read and parse notebook into NotebookNode called self.nb"
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with open(self.infile) as f:
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self.nb = nbformat.read(f, 'json')
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def save(self, infile=None, encoding=None):
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"read and parse notebook into self.nb"
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if infile is None:
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infile = os.path.splitext(self.infile)[0] + '.' + self.extension
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if encoding is None:
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encoding = self.default_encoding
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with open(infile, 'w') as f:
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f.write(self.output.encode(encoding))
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return infile
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def optional_header(self):
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return []
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def optional_footer(self):
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return []
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def _new_figure(self, data, fmt):
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"""Create a new figure file in the given format.
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Returns a path relative to the input file.
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"""
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figname = '%s_fig_%02i.%s' % (self.infile_root,
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self.figures_counter, fmt)
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self.figures_counter += 1
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fullname = os.path.join(self.files_dir, figname)
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# Binary files are base64-encoded, SVG is already XML
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if fmt in ('png', 'jpg', 'pdf'):
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data = data.decode('base64')
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fopen = lambda fname: open(fname, 'wb')
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else:
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fopen = lambda fname: codecs.open(fname, 'wb', self.default_encoding)
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with fopen(fullname) as f:
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f.write(data)
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return fullname
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def render_heading(self, cell):
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"""convert a heading cell
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Returns list."""
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raise NotImplementedError
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def render_code(self, cell):
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"""Convert a code cell
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Returns list."""
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raise NotImplementedError
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def render_markdown(self, cell):
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"""convert a markdown cell
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Returns list."""
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raise NotImplementedError
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def render_pyout(self, output):
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"""convert pyout part of a code cell
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Returns list."""
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raise NotImplementedError
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def render_pyerr(self, output):
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"""convert pyerr part of a code cell
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Returns list."""
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raise NotImplementedError
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def _img_lines(self, img_file):
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"""Return list of lines to include an image file."""
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# Note: subclasses may choose to implement format-specific _FMT_lines
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# methods if they so choose (FMT in {png, svg, jpg, pdf}).
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raise NotImplementedError
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def render_display_data(self, output):
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"""convert display data from the output of a code cell
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Returns list.
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"""
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lines = []
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for fmt in ['png', 'svg', 'jpg', 'pdf']:
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if fmt in output:
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img_file = self._new_figure(output[fmt], fmt)
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# Subclasses can have format-specific render functions (e.g.,
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# latex has to auto-convert all SVG to PDF first).
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lines_fun = getattr(self, '_%s_lines' % fmt, None)
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if not lines_fun:
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lines_fun = self._img_lines
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lines.extend(lines_fun(img_file))
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return lines
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def render_stream(self, cell):
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"""convert stream part of a code cell
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Returns list."""
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raise NotImplementedError
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def render_plaintext(self, cell):
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"""convert plain text
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Returns list."""
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raise NotImplementedError
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def render_unknown(self, cell):
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"""Render cells of unkown type
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Returns list."""
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raise NotImplementedError
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class ConverterRST(Converter):
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extension = 'rst'
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heading_level = {1: '=', 2: '-', 3: '`', 4: '\'', 5: '.', 6: '~'}
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@DocInherit
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def render_heading(self, cell):
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marker = self.heading_level[cell.level]
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return ['{0}\n{1}\n'.format(cell.source, marker * len(cell.source))]
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@DocInherit
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def render_code(self, cell):
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if not cell.input:
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return []
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lines = ['In[%s]:' % cell.prompt_number, '']
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lines.extend(rst_directive('.. code:: python', cell.input))
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for output in cell.outputs:
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conv_fn = self.dispatch(output.output_type)
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lines.extend(conv_fn(output))
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return lines
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@DocInherit
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def render_markdown(self, cell):
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return [cell.source]
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@DocInherit
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def render_plaintext(self, cell):
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return [cell.source]
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@DocInherit
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def render_pyout(self, output):
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lines = ['Out[%s]:' % output.prompt_number, '']
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# output is a dictionary like object with type as a key
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if 'latex' in output:
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lines.extend(rst_directive('.. math::', output.latex))
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if 'text' in output:
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lines.extend(rst_directive('.. parsed-literal::', output.text))
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return lines
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@DocInherit
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def _img_lines(self, img_file):
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return ['.. image:: %s' % img_file, '']
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@DocInherit
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def render_stream(self, output):
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lines = []
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if 'text' in output:
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lines.extend(rst_directive('.. parsed-literal::', output.text))
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return lines
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@DocInherit
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def render_unknown(self, cell):
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return rst_directive('.. warning:: Unknown cell') + [repr(cell)]
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class ConverterQuickHTML(Converter):
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extension = 'html'
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def optional_header(self):
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# XXX: inject the IPython standard CSS into here
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s = """<html>
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<head>
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</head>
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<body>
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"""
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return s.splitlines()
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def optional_footer(self):
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s = """</body>
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</html>
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"""
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return s.splitlines()
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@DocInherit
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def render_heading(self, cell):
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marker = cell.level
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return ['<h{1}>\n {0}\n</h{1}>'.format(cell.source, marker)]
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@DocInherit
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def render_code(self, cell):
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if not cell.input:
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return []
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lines = ['<table>']
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lines.append('<tr><td><tt>In [<b>%s</b>]:</tt></td><td><tt>' % cell.prompt_number)
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lines.append("<br>\n".join(cell.input.splitlines()))
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lines.append('</tt></td></tr>')
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for output in cell.outputs:
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lines.append('<tr><td></td><td>')
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conv_fn = self.dispatch(output.output_type)
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lines.extend(conv_fn(output))
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lines.append('</td></tr>')
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lines.append('</table>')
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return lines
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@DocInherit
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def render_markdown(self, cell):
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return ["<pre>"+cell.source+"</pre>"]
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@DocInherit
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def render_plaintext(self, cell):
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return ["<pre>"+cell.source+"</pre>"]
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@DocInherit
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def render_pyout(self, output):
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lines = ['<tr><td><tt>Out[<b>%s</b>]:</tt></td></tr>' % output.prompt_number, '<td>']
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# output is a dictionary like object with type as a key
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if 'latex' in output:
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lines.append("<pre>")
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lines.extend(indent(output.latex))
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lines.append("</pre>")
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if 'text' in output:
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lines.append("<pre>")
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lines.extend(indent(output.text))
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lines.append("</pre>")
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return lines
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@DocInherit
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def _img_lines(self, img_file):
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return ['<img src="%s">' % img_file, '']
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@DocInherit
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def render_stream(self, output):
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lines = []
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if 'text' in output:
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lines.append(output.text)
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return lines
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class ConverterLaTeX(Converter):
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"""Converts a notebook to a .tex file suitable for pdflatex.
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Note: this converter *needs*:
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- `pandoc`: for all conversion of markdown cells. If your notebook only
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has Raw cells, pandoc will not be needed.
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- `inkscape`: if your notebook has SVG figures. These need to be
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converted to PDF before inclusion in the TeX file, as LaTeX doesn't
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understand SVG natively.
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You will in general obtain much better final PDF results if you configure
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the matplotlib backend to create SVG output with
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%config InlineBackend.figure_format = 'svg'
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(or set the equivalent flag at startup or in your configuration profile).
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"""
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extension = 'tex'
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documentclass = 'article'
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documentclass_options = '11pt,english'
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heading_map = {1: r'\section',
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2: r'\subsection',
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3: r'\subsubsection',
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4: r'\paragraph',
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5: r'\subparagraph',
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6: r'\subparagraph'}
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def env(self, environment, lines):
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"""Return list of environment lines for input lines
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Parameters
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----------
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env : string
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Name of the environment to bracket with begin/end.
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lines: """
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out = [r'\begin{%s}' % environment]
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if isinstance(lines, basestring):
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out.append(lines)
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else: # list
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out.extend(lines)
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out.append(r'\end{%s}' % environment)
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return out
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def convert(self):
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# The main body is done by the logic in the parent class, and that's
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# all we need if preamble support has been turned off.
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body = super(ConverterLaTeX, self).convert()
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if not self.with_preamble:
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return body
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# But if preamble is on, then we need to construct a proper, standalone
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# tex file.
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# Tag the document at the top and set latex class
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final = [ r'%% This file was auto-generated by IPython, do NOT edit',
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r'%% Conversion from the original notebook file:',
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r'%% {0}'.format(self.infile),
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r'%%',
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r'\documentclass[%s]{%s}' % (self.documentclass_options,
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self.documentclass),
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'',
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]
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# Load our own preamble, which is stored next to the main file. We
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# need to be careful in case the script entry point is a symlink
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myfile = __file__ if not os.path.islink(__file__) else \
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os.readlink(__file__)
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with open(os.path.join(os.path.dirname(myfile), 'preamble.tex')) as f:
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final.append(f.read())
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# Load any additional user-supplied preamble
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if self.user_preamble:
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final.extend(['', '%% Adding user preamble from file:',
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'%% {0}'.format(self.user_preamble), ''])
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with open(self.user_preamble) as f:
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final.append(f.read())
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# Include document body
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final.extend([ r'\begin{document}', '',
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body,
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r'\end{document}', ''])
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# Retun value must be a string
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return '\n'.join(final)
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@DocInherit
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def render_heading(self, cell):
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marker = self.heading_map[cell.level]
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return ['%s{%s}\n\n' % (marker, cell.source) ]
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@DocInherit
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def render_code(self, cell):
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if not cell.input:
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return []
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# Cell codes first carry input code, we use lstlisting for that
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lines = [r'\begin{codecell}']
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lines.extend(self.env('codeinput',
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self.env('lstlisting', cell.input)))
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outlines = []
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for output in cell.outputs:
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conv_fn = self.dispatch(output.output_type)
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outlines.extend(conv_fn(output))
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# And then output of many possible types; use a frame for all of it.
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if outlines:
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lines.extend(self.env('codeoutput', outlines))
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lines.append(r'\end{codecell}')
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return lines
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@DocInherit
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def _img_lines(self, img_file):
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return self.env('center',
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[r'\includegraphics[width=3in]{%s}' % img_file, r'\par'])
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def _svg_lines(self, img_file):
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base_file = os.path.splitext(img_file)[0]
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pdf_file = base_file + '.pdf'
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subprocess.check_call(['inkscape', '--export-pdf=%s' % pdf_file,
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img_file])
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return self._img_lines(pdf_file)
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@DocInherit
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def render_stream(self, output):
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lines = []
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if 'text' in output:
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lines.extend(self.env('verbatim', output.text.strip()))
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return lines
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@DocInherit
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def render_markdown(self, cell):
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return [markdown2latex(cell['source'])]
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@DocInherit
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def render_pyout(self, output):
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lines = []
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# output is a dictionary like object with type as a key
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if 'latex' in output:
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lines.extend(output.latex)
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if 'text' in output:
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lines.extend(self.env('verbatim', output.text))
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return lines
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@DocInherit
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def render_pyerr(self, output):
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# Note: a traceback is a *list* of frames.
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return self.env('traceback',
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self.env('verbatim',
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remove_ansi('\n'.join(output.traceback))))
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@DocInherit
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def render_unknown(self, cell):
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return self.env('verbatim', pprint.pformat(cell))
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def rst2simplehtml(infile):
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"""Convert a rst file to simplified html suitable for blogger.
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This just runs rst2html with certain parameters to produce really simple
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html and strips the document header, so the resulting file can be easily
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pasted into a blogger edit window.
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"""
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# This is the template for the rst2html call that produces the cleanest,
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# simplest html I could find. This should help in making it easier to
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# paste into the blogspot html window, though I'm still having problems
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# with linebreaks there...
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cmd_template = ("rst2html --link-stylesheet --no-xml-declaration "
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"--no-generator --no-datestamp --no-source-link "
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"--no-toc-backlinks --no-section-numbering "
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"--strip-comments ")
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cmd = "%s %s" % (cmd_template, infile)
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proc = subprocess.Popen(cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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shell=True)
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html, stderr = proc.communicate()
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if stderr:
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raise IOError(stderr)
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# Make an iterator so breaking out holds state. Our implementation of
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# searching for the html body below is basically a trivial little state
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# machine, so we need this.
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walker = iter(html.splitlines())
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# Find start of main text, break out to then print until we find end /div.
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# This may only work if there's a real title defined so we get a 'div class'
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# tag, I haven't really tried.
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for line in walker:
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if line.startswith('<body>'):
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break
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|
newfname = os.path.splitext(infile)[0] + '.html'
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with open(newfname, 'w') as f:
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for line in walker:
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if line.startswith('</body>'):
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break
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f.write(line)
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f.write('\n')
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return newfname
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known_formats = "rst (default), html, quick-html, latex"
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|
def main(infile, format='rst'):
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"""Convert a notebook to html in one step"""
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# XXX: this is just quick and dirty for now. When adding a new format,
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# make sure to add it to the `known_formats` string above, which gets
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# printed in in the catch-all else, as well as in the help
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|
if format == 'rst':
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|
converter = ConverterRST(infile)
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converter.render()
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elif format == 'html':
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#Currently, conversion to html is a 2 step process, nb->rst->html
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|
converter = ConverterRST(infile)
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rstfname = converter.render()
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rst2simplehtml(rstfname)
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elif format == 'quick-html':
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converter = ConverterQuickHTML(infile)
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rstfname = converter.render()
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elif format == 'latex':
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converter = ConverterLaTeX(infile)
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|
latexfname = converter.render()
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|
else:
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|
raise SystemExit("Unknown format '%s', " % format +
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|
|
"known formats are: " + known_formats)
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|
|
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|
|
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|
|
|
if __name__ == '__main__':
|
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|
parser = argparse.ArgumentParser(description=__doc__,
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|
|
formatter_class=argparse.RawTextHelpFormatter)
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|
# TODO: consider passing file like object around, rather than filenames
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|
# would allow us to process stdin, or even http streams
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|
#parser.add_argument('infile', nargs='?', type=argparse.FileType('r'), default=sys.stdin)
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|
|
|
#Require a filename as a positional argument
|
|
|
parser.add_argument('infile', nargs=1)
|
|
|
parser.add_argument('-f', '--format', default='rst',
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|
|
help='Output format. Supported formats: \n' +
|
|
|
known_formats)
|
|
|
args = parser.parse_args()
|
|
|
main(infile=args.infile[0], format=args.format)
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|
