#!/usr/bin/env python """Convert IPython notebooks to other formats, such as ReST, and HTML. Example: ./nbconvert.py --format html file.ipynb Produces 'file.rst' and 'file.html', along with auto-generated figure files called nb_figure_NN.png. To avoid the two-step process, ipynb -> rst -> html, use '--format quick-html' which will do ipynb -> html, but won't look as pretty. """ import os import subprocess import sys from IPython.external import argparse from IPython.nbformat import current as nbformat from IPython.utils.text import indent from decorators import DocInherit # Cell converters def unknown_cell(cell): """Default converter for cells of unknown type. """ return rst_directive('.. warning:: Unknown cell') + \ [repr(cell)] def rst_directive(directive, text=''): out = [directive, ''] if text: out.extend([indent(text), '']) return out # Converters for parts of a cell. class ConversionException(Exception): pass class Converter(object): default_encoding = 'utf-8' def __init__(self, infile): self.infile = infile self.dirpath = os.path.dirname(infile) @property def extension(self): raise ConversionException("""extension must be defined in Converter subclass""") def dispatch(self, cell_type): """return cell_type dependent render method, for example render_code """ # XXX: unknown_cell here is RST specific - make it generic return getattr(self, 'render_' + cell_type, unknown_cell) def convert(self): lines = [] lines.extend(self.optional_header()) for cell in self.nb.worksheets[0].cells: conv_fn = self.dispatch(cell.cell_type) lines.extend(conv_fn(cell)) lines.append('') lines.extend(self.optional_footer()) return '\n'.join(lines) def render(self): "read, convert, and save self.infile" self.read() self.output = self.convert() return self.save() def read(self): "read and parse notebook into NotebookNode called self.nb" with open(self.infile) as f: self.nb = nbformat.read(f, 'json') def save(self, infile=None, encoding=None): "read and parse notebook into self.nb" if infile is None: infile = os.path.splitext(self.infile)[0] + '.' + self.extension if encoding is None: encoding = self.default_encoding with open(infile, 'w') as f: f.write(self.output.encode(encoding)) return infile def optional_header(self): return [] def optional_footer(self): return [] def render_heading(self, cell): """convert a heading cell Returns list.""" raise NotImplementedError def render_code(self, cell): """Convert a code cell Returns list.""" raise NotImplementedError def render_markdown(self, cell): """convert a markdown cell Returns list.""" raise NotImplementedError def render_pyout(self, cell): """convert pyout part of a code cell Returns list.""" raise NotImplementedError def render_display_data(self, cell): """convert display data from the output of a code cell Returns list. """ raise NotImplementedError def render_stream(self, cell): """convert stream part of a code cell Returns list.""" raise NotImplementedError def render_plaintext(self, cell): """convert plain text Returns list.""" raise NotImplementedError class ConverterRST(Converter): extension = 'rst' figures_counter = 0 heading_level = {1: '=', 2: '-', 3: '`', 4: '\'', 5: '.', 6: '~'} @DocInherit def render_heading(self, cell): marker = self.heading_level[cell.level] return ['{0}\n{1}\n'.format(cell.source, marker * len(cell.source))] @DocInherit def render_code(self, cell): if not cell.input: return [] lines = ['In[%s]:' % cell.prompt_number, ''] lines.extend(rst_directive('.. code:: python', cell.input)) for output in cell.outputs: conv_fn = self.dispatch(output.output_type) lines.extend(conv_fn(output)) return lines @DocInherit def render_markdown(self, cell): return [cell.source] @DocInherit def render_plaintext(self, cell): return [cell.source] @DocInherit def render_pyout(self, output): lines = ['Out[%s]:' % output.prompt_number, ''] # output is a dictionary like object with type as a key if 'latex' in output: lines.extend(rst_directive('.. math::', output.latex)) if 'text' in output: lines.extend(rst_directive('.. parsed-literal::', output.text)) return lines @DocInherit def render_display_data(self, output): lines = [] if 'png' in output: # XXX: make the figures notebooks specific (i.e. self.infile) so # that multiple notebook conversions don't clobber each other's # figures infile = 'nb_figure_%s.png' % self.figures_counter fullname = os.path.join(self.dirpath, infile) with open(fullname, 'w') as f: f.write(output.png.decode('base64')) self.figures_counter += 1 lines.append('.. image:: %s' % infile) lines.append('') return lines @DocInherit def render_stream(self, output): lines = [] if 'text' in output: lines.extend(rst_directive('.. parsed-literal::', output.text)) return lines class ConverterQuickHTML(Converter): extension = 'html' figures_counter = 0 def optional_header(self): # XXX: inject the IPython standard CSS into here s = """ """ return s.splitlines() def optional_footer(self): s = """ """ return s.splitlines() @DocInherit def render_heading(self, cell): marker = cell.level return ['\n {0}\n'.format(cell.source, marker)] @DocInherit def render_code(self, cell): if not cell.input: return [] lines = [''] lines.append('') for output in cell.outputs: lines.append('') lines.append('
In [%s]:' % cell.prompt_number) lines.append("
\n".join(cell.input.splitlines())) lines.append('
') conv_fn = self.dispatch(output.output_type) lines.extend(conv_fn(output)) lines.append('
') return lines @DocInherit def render_markdown(self, cell): return ["
"+cell.source+"
"] @DocInherit def render_plaintext(self, cell): return ["
"+cell.source+"
"] @DocInherit def render_pyout(self, output): lines = ['Out[%s]:' % output.prompt_number, ''] # output is a dictionary like object with type as a key if 'latex' in output: lines.append("
")
            lines.extend(indent(output.latex))
            lines.append("
") if 'text' in output: lines.append("
")
            lines.extend(indent(output.text))
            lines.append("
") return lines @DocInherit def render_display_data(self, output): lines = [] if 'png' in output: infile = 'nb_figure_%s.png' % self.figures_counter fullname = os.path.join(self.dirpath, infile) with open(fullname, 'w') as f: f.write(output.png.decode('base64')) self.figures_counter += 1 lines.append('' % infile) lines.append('') return lines @DocInherit def render_stream(self, output): lines = [] if 'text' in output: lines.append(output.text) return lines def rst2simplehtml(infile): """Convert a rst file to simplified html suitable for blogger. This just runs rst2html with certain parameters to produce really simple html and strips the document header, so the resulting file can be easily pasted into a blogger edit window. """ # This is the template for the rst2html call that produces the cleanest, # simplest html I could find. This should help in making it easier to # paste into the blogspot html window, though I'm still having problems # with linebreaks there... cmd_template = ("rst2html --link-stylesheet --no-xml-declaration " "--no-generator --no-datestamp --no-source-link " "--no-toc-backlinks --no-section-numbering " "--strip-comments ") cmd = "%s %s" % (cmd_template, infile) proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True) html, stderr = proc.communicate() if stderr: raise IOError(stderr) # Make an iterator so breaking out holds state. Our implementation of # searching for the html body below is basically a trivial little state # machine, so we need this. walker = iter(html.splitlines()) # Find start of main text, break out to then print until we find end /div. # This may only work if there's a real title defined so we get a 'div class' # tag, I haven't really tried. for line in walker: if line.startswith(''): break newfname = os.path.splitext(infile)[0] + '.html' with open(newfname, 'w') as f: for line in walker: if line.startswith(''): break f.write(line) f.write('\n') return newfname known_formats = "rst (default), html, quick-html" def main(infile, format='rst'): """Convert a notebook to html in one step""" # XXX: this is just quick and dirty for now. When adding a new format, # make sure to add it to the `known_formats` string above, which gets # printed in in the catch-all else, as well as in the help if format == 'rst': converter = ConverterRST(infile) converter.render() elif format == 'html': #Currently, conversion to html is a 2 step process, nb->rst->html converter = ConverterRST(infile) rstfname = converter.render() rst2simplehtml(rstfname) elif format == 'quick-html': converter = ConverterQuickHTML(infile) rstfname = converter.render() else: raise SystemExit("Unknown format '%s', " % format + "known formats are: " + known_formats) if __name__ == '__main__': parser = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawTextHelpFormatter) # TODO: consider passing file like object around, rather than filenames # would allow us to process stdin, or even http streams #parser.add_argument('infile', nargs='?', type=argparse.FileType('r'), default=sys.stdin) #Require a filename as a positional argument parser.add_argument('infile', nargs=1) parser.add_argument('-f', '--format', default='rst', help='Output format. Supported formats: \n' + known_formats) args = parser.parse_args() main(infile=args.infile[0], format=args.format)