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"""Module containing a preprocessor that converts outputs in the notebook from
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one format to another.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import base64
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import io
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import os
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import sys
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import subprocess
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from IPython.utils.tempdir import TemporaryDirectory
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from IPython.utils.traitlets import Unicode
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from .convertfigures import ConvertFiguresPreprocessor
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INKSCAPE_APP = '/Applications/Inkscape.app/Contents/Resources/bin/inkscape'
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class SVG2PDFPreprocessor(ConvertFiguresPreprocessor):
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"""
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Converts all of the outputs in a notebook from SVG to PDF.
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"""
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def _from_format_default(self):
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return 'image/svg+xml'
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def _to_format_default(self):
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return 'application/pdf'
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command = Unicode(config=True,
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help="""The command to use for converting SVG to PDF
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This string is a template, which will be formatted with the keys
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to_filename and from_filename.
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The conversion call must read the SVG from {from_flename},
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and write a PDF to {to_filename}.
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""")
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def _command_default(self):
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return self.inkscape + \
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' --without-gui --export-pdf="{to_filename}" "{from_filename}"'
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inkscape = Unicode(config=True, help="The path to Inkscape, if necessary")
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def _inkscape_default(self):
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if sys.platform == "darwin":
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if os.path.isfile(INKSCAPE_APP):
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return INKSCAPE_APP
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return "inkscape"
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def convert_figure(self, data_format, data):
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"""
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Convert a single SVG figure to PDF. Returns converted data.
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"""
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#Work in a temporary directory
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with TemporaryDirectory() as tmpdir:
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#Write fig to temp file
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input_filename = os.path.join(tmpdir, 'figure.' + data_format)
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# SVG data is unicode text
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with io.open(input_filename, 'w', encoding='utf8') as f:
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f.write(data)
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#Call conversion application
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output_filename = os.path.join(tmpdir, 'figure.pdf')
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shell = self.command.format(from_filename=input_filename,
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to_filename=output_filename)
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subprocess.call(shell, shell=True) #Shell=True okay since input is trusted.
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#Read output from drive
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# return value expects a filename
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if os.path.isfile(output_filename):
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with open(output_filename, 'rb') as f:
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# PDF is a nb supported binary, data type, so base64 encode.
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return base64.encodestring(f.read())
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else:
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raise TypeError("Inkscape svg to pdf conversion failed")
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