"""
Contains writer for writing nbconvert output to PDF.
"""
#-----------------------------------------------------------------------------
#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 subprocess
import os

from IPython.utils.traitlets import Integer, List, Bool

from .base import PostProcessorBase

#-----------------------------------------------------------------------------
# Classes
#-----------------------------------------------------------------------------
class PDFPostProcessor(PostProcessorBase):
    """Writer designed to write to PDF files"""

    iteration_count = Integer(3, config=True, help="""
        How many times pdflatex will be called.
        """)

    command = List(["pdflatex", "{filename}"], config=True, help="""
        Shell command used to compile PDF.""")

    verbose = Bool(False, config=True, help="""
        Whether or not to display the output of the compile call.
        """)

    def call(self, input):
            """
            Consume and write Jinja output a PDF.  
            See files.py for more...
            """        
            command = [c.format(filename=input) for c in self.command]
            self.log.info("Building PDF: `%s`", ' '.join(command))
            with open(os.devnull, 'wb') as null:
                stdout = null if not self.verbose else None
                for index in range(self.iteration_count):
                    p = subprocess.Popen(command, stdout=stdout)
                    p.wait()

@@ -1104,16 +1104,43 @@
 flatex%22,
+ %22--interaction=batchmode%22,
  %22%7Bfilen

add `--interaction=batchmode` to pdflatex call