Missing imports

IPython/nbconvert/transformers/svg2pdf.py

@@ -1,78 +1,81
 """Module containing a transformer that converts outputs in the notebook from 
 one format to another.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import os
+import sys
+import subprocess
+
 from IPython.utils.tempdir import TemporaryDirectory
 
 from .convertfigures import ConvertFiguresTransformer
 
 
 #-----------------------------------------------------------------------------
 # Constants
 #-----------------------------------------------------------------------------
 
 INKSCAPE_COMMAND = 'inkscape --without-gui --export-pdf="{to_filename}" "{from_filename}"'
 INKSCAPE_OSX_COMMAND = '/Applications/Inkscape.app/Contents/Resources/bin/inkscape --without-gui --export-pdf="{to_filename}" "{from_filename}"'
 
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class ConvertSvgTransformer(ConvertFiguresTransformer):
     """
     Converts all of the outputs in a notebook from one format to another.
     """
 
 
     def __init__(self, **kw):
         """
         Constructor
         """
         super(ConvertSvgTransformer, self).__init__(['svg'], 'pdf', **kw)
 
 
     def convert_figure(self, data_format, data):
         """
         Convert a single Svg figure.  Returns converted data.
         """
 
         #Work in a temporary directory
         with TemporaryDirectory() as tmpdir:
             
             #Write fig to temp file
             input_filename = os.path.join(tmpdir, 'figure.' + data_format)
             with open(input_filename, 'w') as f:
                 f.write(data)
 
             #Determine command (different on Mac OSX)
             command = INKSCAPE_COMMAND 
             if sys.platform == 'darwin':
                 command = INKSCAPE_OSX_COMMAND
 
             #Call conversion application
             output_filename = os.path.join(tmpdir, 'figure.pdf')
             shell = command.format(from_filename=input_filename, 
                                    to_filename=output_filename)
             subprocess.call(shell, shell=True) #Shell=True okay since input is trusted.
 
             #Read output from drive
             if os.path.isfile(output_filename):
                 with open(output_filename, 'rb') as f:
                     return f.read().encode("base64") #PDF is a nb supported binary
                                                      #data type, so base64 encode.
             else:
                 return TypeError("Inkscape svg to png conversion failed")
 #TODO: ERROR: which notebook crashed exporter