Magic for tikz plots in the IPython notebook, modified to prevent SVG glyph crashes, and to enable a local copy of file

tikzmagic.py

# -*- coding: utf-8 -*-
"""
=========
tikzmagic
=========

Magics for generating figures with TikZ.

.. note::

  ``TikZ`` and ``LaTeX`` need to be installed separately.

Usage
=====

``%%tikz``

{TIKZ_DOC}

"""

#-----------------------------------------------------------------------------
#  Copyright (C) 2013 The IPython Development Team
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------

import sys
import tempfile
from glob import glob
from os import chdir, getcwd
from subprocess import call
from shutil import rmtree, copy
from xml.dom import minidom

from IPython.core.displaypub import publish_display_data
from IPython.core.magic import (Magics, magics_class, line_magic,
                                line_cell_magic, needs_local_scope)
from IPython.testing.skipdoctest import skip_doctest
from IPython.core.magic_arguments import (
    argument, magic_arguments, parse_argstring
)
from IPython.utils.py3compat import unicode_to_str

_mimetypes = {'png' : 'image/png',
             'svg' : 'image/svg+xml',
             'jpg' : 'image/jpeg',
              'jpeg': 'image/jpeg'}

@magics_class
class TikzMagics(Magics):
    """A set of magics useful for creating figures with TikZ.
    """
    def __init__(self, shell):
        """
        Parameters
        ----------
        shell : IPython shell

        """
        super(TikzMagics, self).__init__(shell)
        self._plot_format = 'png'

        # Allow publish_display_data to be overridden for
        # testing purposes.
        self._publish_display_data = publish_display_data


    def _fix_gnuplot_svg_size(self, image, size=None):
        """
        GnuPlot SVGs do not have height/width attributes.  Set
        these to be the same as the viewBox, so that the browser
        scales the image correctly.

        Parameters
        ----------
        image : str
            SVG data.
        size : tuple of int
            Image width, height.

        """
        (svg,) = minidom.parseString(image).getElementsByTagName('svg')
        viewbox = svg.getAttribute('viewBox').split(' ')

        if size is not None:
            width, height = size
        else:
            width, height = viewbox[2:]

        svg.setAttribute('width', '%dpx' % width)
        svg.setAttribute('height', '%dpx' % height)
        return svg.toxml()
    
    
    def _run_latex(self, code, dir):
        f = open(dir + '/tikz.tex', 'w')
        f.write(code)
        f.close()
        
        current_dir = getcwd()
        chdir(dir)
        
        ret_log = False
        log = None
        
        try:
            retcode = call("pdflatex -shell-escape tikz.tex", shell=True)
            if retcode != 0:
                print >> sys.stderr, "LaTeX terminated with signal", -retcode
                ret_log = True
        except OSError as e:
            print >> sys.stderr, "LaTeX execution failed:", e
            ret_log = True
        
        # in case of error return LaTeX log
        if ret_log:
            try:
                f = open('tikz.log', 'r')
                log = f.read()
                f.close()
            except IOError:
                print >> sys.stderr, "No log file generated."
        
        chdir(current_dir)
    
        return log
    

    def _convert_pdf_to_svg(self, dir):
        current_dir = getcwd()
        chdir(dir)
        
        try:
            retcode = call("pdf2svg tikz.pdf tikz.svg", shell=True)
            if retcode != 0:
                print >> sys.stderr, "pdf2svg terminated with signal", -retcode
        except OSError as e:
            print >> sys.stderr, "pdf2svg execution failed:", e
        
        chdir(current_dir)
        

    def _convert_png_to_jpg(self, dir):
        current_dir = getcwd()
        chdir(dir)
        
        try:
            retcode = call("convert tikz.png -quality 100 -background white -flatten tikz.jpg", shell=True)
            if retcode != 0:
                print >> sys.stderr, "convert terminated with signal", -retcode
        except OSError as e:
            print >> sys.stderr, "convert execution failed:", e

        chdir(current_dir)
        

    @skip_doctest
    @magic_arguments()
    @argument(
        '-sc', '--scale', action='store',
        help='Scaling factor of plots. Default is "--scale 1".'
        )
    @argument(
        '-s', '--size', action='store',
        help='Pixel size of plots, "width,height". Default is "-s 400,240".'
        )
    @argument(
        '-f', '--format', action='store',
        help='Plot format (png, svg or jpg).'
        )
    @argument(
        '-S', '--save', action='store',
        help='Save a copy to "filename".'
        )

    @needs_local_scope
    @argument(
        'code',
        nargs='*',
        )
    @line_cell_magic
    def tikz(self, line, cell=None, local_ns=None):
        '''
        Run TikZ code in LaTeX and plot result.
        
            In [9]: %tikz \draw (0,0) rectangle (1,1);

        As a cell, this will run a block of TikZ code::

            In [10]: %%tikz
               ....: \draw (0,0) rectangle (1,1);

        In the notebook, plots are published as the output of the cell.

        The size and format of output plots can be specified::

            In [18]: %%tikz -s 600,800 -f svg --scale 2
                ...: \draw (0,0) rectangle (1,1);
                ...: \filldraw (0.5,0.5) circle (.1);

        '''
        args = parse_argstring(self.tikz, line)

        # arguments 'code' in line are prepended to the cell lines
        if cell is None:
            code = ''
            return_output = True
        else:
            code = cell
            return_output = False

        code = ' '.join(args.code) + code

        # if there is no local namespace then default to an empty dict
        if local_ns is None:
            local_ns = {}

        # generate plots in a temporary directory
        plot_dir = tempfile.mkdtemp().replace('\\', '/')
        #print(plot_dir)
        
        if args.scale is not None:
            scale = args.scale
        else:
            scale = '1'

        if args.size is not None:
            size = args.size
        else:
            size = '400,240'

        width, height = size.split(',')
        
        if args.format is not None:
            plot_format = args.format
        else:
            plot_format = 'png'

        add_params = ""
        
        if plot_format == 'png' or plot_format == 'jpg' or plot_format == 'jpeg':
            add_params += "density=300,"
        
#\\documentclass[convert={%(add_params)ssize=%(width)sx%(height)s,outext=.%(plot_format)s},border=0pt]{standalone}
        
        pre_tex = '''
\\documentclass[convert={%(add_params)ssize=%(width)sx%(height)s,outext=.png},border=0pt]{standalone}
\\usepackage{tikz}
\\usetikzlibrary{intersections}
\\usetikzlibrary{calc}
\\begin{document}
\\begin{tikzpicture}[scale=%(scale)s]
        ''' % locals()

        post_tex = '''
\\end{tikzpicture}
\\end{document}
        '''

        code = ' '.join((pre_tex, code, post_tex))
        text_output = self._run_latex(code, plot_dir)
        
        if plot_format == 'jpg' or plot_format == 'jpeg':
            self._convert_png_to_jpg(plot_dir)
        elif plot_format == 'svg':
            self._convert_pdf_to_svg(plot_dir)
        
        key = 'TikZMagic.Tikz'
        display_data = []

        # Publish text output
        if text_output:
            display_data.append((key, {'text/plain': text_output}))

        image_filename = "%s/tikz.%s" % (plot_dir, plot_format)
        
        # Publish image
        try:
            image = open(image_filename, 'rb').read()
            plot_mime_type = _mimetypes.get(plot_format, 'image/%s' % (plot_format))
            width, height = [int(s) for s in size.split(',')]
            if plot_format == 'svg':
                image = self._fix_gnuplot_svg_size(image, size=(width, height))
            display_data.append((key, {plot_mime_type: image}))

        except IOError:
            print >> sys.stderr, "No image generated."
        
        # Copy output file if requested
        if args.save is not None:
            copy(image_filename, args.save)
        
        rmtree(plot_dir)

        for source, data in display_data:
            # isolate data in an iframe, to prevent clashing glyph declarations in SVG 
            self._publish_display_data(source, data, metadata={'isolated' : 'true'})


__doc__ = __doc__.format(
    TIKZ_DOC = ' '*8 + TikzMagics.tikz.__doc__,
    )


def load_ipython_extension(ip):
    """Load the extension in IPython."""
    ip.register_magics(TikzMagics)

This functionality has already been incorporated into the magic by (I think) the original author. Available from https://github.com/mkrphys/ipython-tikzmagic. So this gist should be considered obsolete.