#!/usr/bin/env python
# -*- coding: utf-8 -*-

from pyPdf import PdfFileWriter, PdfFileReader
import sys

#~ if sys.argv.length < 1:
    #~ exit(0)
filename = sys.argv[1]

output = PdfFileWriter()
input1 = PdfFileReader(file(filename,"rb"))
input2 = PdfFileReader(file(filename,"rb"))



for i in range(input1.getNumPages()):
    page_right = input1.getPage(i)

    page_right.mediaBox.upperRight = (
        page_right.mediaBox.getUpperRight_x(),
        page_right.mediaBox.getUpperRight_y() / 2 + 30,
    )
    page_right.mediaBox.lowerLeft = (0,30)

    output.addPage(page_right)

    page_left = input2.getPage(i)

    page_left.mediaBox.lowerLeft = (
        0,
        page_left.mediaBox.getUpperRight_y() / 2 - 30
    )
    page_left.mediaBox.upperRight = (
        page_left.mediaBox.getUpperRight_x(),
        page_left.mediaBox.getUpperRight_y() - 30
    )


    output.addPage(page_left)


outputStream = file("output.pdf","wb")
output.write(outputStream)
outputStream.close()