#!/usr/bin/python

from sys import argv, exit
import os
import getopt
import tempfile

options, args = getopt.gnu_getopt(argv[1:], 'o:')

if len(args) >= 1:
	outfile = ''
	for f in args:
		if not os.path.exists(f):
			print "Error: input file '%s' does not exist" % f
			exit(-1)
	for option in options:
		if option[0] == '-o':
			outfile = os.path.abspath(option[1])
	if outfile == '':
		print "Error: no output file name given"
		exit(-1)

	tmpdir = tempfile.mkdtemp()
	texfile = open(os.path.join(tmpdir, 'tmp.tex'), 'w')
	texfile.write("""\\documentclass{article}
\\usepackage{pdfpages}
\\begin{document}""")
	for infile in args:
	   f = os.path.abspath(infile)
	   texfile.write("\\includepdf[pages=-,fitpaper=true]{%s}" % f)
	texfile.write("\\end{document}")
	texfile.close()

	os.chdir(os.path.dirname(texfile.name))
	os.spawnvp(os.P_WAIT, 'pdflatex', ['pdflatex', texfile.name])
	os.rename(os.path.join(tmpdir, 'tmp.pdf'), outfile)

	for f in os.listdir(tmpdir):
		os.unlink(f)
	os.removedirs(tmpdir)

else:
	print 'usage: pdfmerge -o OUTPUT INPUTs'