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#!/usr/bin/env python
'''
usage: booklet.py my.pdf
Uses Form XObjects and reportlab to create booklet.my.pdf.
Demonstrates use of pdfrw with reportlab.
'''
import sys
import os
from reportlab.pdfgen.canvas import Canvas
from pdfrw import PdfReader
from pdfrw.buildxobj import pagexobj
from pdfrw.toreportlab import makerl
def read_and_double(inpfn):
pages = PdfReader(inpfn).pages
pages = [pagexobj(x) for x in pages]
if len(pages) & 1:
pages.append(pages[0]) # Sentinel -- get same size for back as front
xobjs = []
while len(pages) > 2:
xobjs.append((pages.pop(), pages.pop(0)))
xobjs.append((pages.pop(0), pages.pop()))
xobjs += [(x,) for x in pages]
return xobjs
def make_pdf(outfn, xobjpairs):
canvas = Canvas(outfn)
for xobjlist in xobjpairs:
x = y = 0
for xobj in xobjlist:
x += xobj.BBox[2]
y = max(y, xobj.BBox[3])
canvas.setPageSize((x, y))
# Handle blank back page
if len(xobjlist) > 1 and xobjlist[0] == xobjlist[-1]:
xobjlist = xobjlist[:1]
x = xobjlist[0].BBox[2]
else:
x = 0
y = 0
for xobj in xobjlist:
canvas.saveState()
canvas.translate(x, y)
canvas.doForm(makerl(canvas, xobj))
canvas.restoreState()
x += xobj.BBox[2]
canvas.showPage()
canvas.save()
inpfn, = sys.argv[1:]
outfn = 'booklet.' + os.path.basename(inpfn)
make_pdf(outfn, read_and_double(inpfn))
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