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"""Module containing a transformer that converts outputs in the notebook from
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one format to another.
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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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import os
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from IPython.utils.tempdir import TemporaryDirectory
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from .convertfigures import ConvertFiguresTransformer
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#-----------------------------------------------------------------------------
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# Constants
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#-----------------------------------------------------------------------------
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INKSCAPE_COMMAND = "inkscape --without-gui --export-pdf=\"{to_filename}\" \"{from_filename}\""
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class ConvertSvgTransformer(ConvertFiguresTransformer):
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"""
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Converts all of the outputs in a notebook from one format to another.
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"""
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def __init__(self, **kw):
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"""
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Constructor
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"""
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super(ConvertSvgTransformer, self).__init__(['svg'], 'pdf', **kw)
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def convert_figure(self, data_format, data):
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"""
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Convert a single Svg figure. 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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with open(input_filename, 'w') 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 = INKSCAPE_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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if os.path.isfile(output_filename):
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with open(output_filename, 'rb') as f:
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return f.read().encode("base64") #PDF is a nb supported binary
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#data type, so base64 encode.
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else:
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return TypeError("Inkscape svg to png conversion failed")
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