#! /usr/bin/env python

#
# rotate an image by 180
#

import sys, os
import Image

def rotate(jpegfile,angle):
    oldname = "old_"+jpegfile
    try:
        os.rename(jpegfile,oldname)
        imfile = Image.open(oldname)
        rotten = imfile.rotate(angle)
        rotten.save(jpegfile)
    except IOError, iio:
        sys.stderr.write("can't open image %s reason: %s\n" % (jpegfile,iio))
        return
    except os.error, exc:
        sys.stderr.write("can't create directory %s:%s\n" % (dir, exc))


def main():
    if len(sys.argv) < 2:
	print "rot180 <jpegfile> [degrees] - backups original to old_jpegfile"
	return

    angle = 180
    if len(sys.argv) > 2:
	angle = float(sys.argv[2])
    if os.path.exists(sys.argv[1]):
        rotate(sys.argv[1],angle)
    else:
        sys.stderr.write("image %s does not exist\n" % (sys.argv[1]))
                


if __name__ == '__main__':
    main()