#!/usr/bin/python

import re, os, string, sys

help = "echo *.jpg | "+sys.argv[0]+" -s <scaling factor> [-f (optional flip leftright)]" 

if len(sys.argv) < 3:
	print help
	sys.exit(0)

scale = sys.argv[2]
flip = 0

if len(sys.argv) > 3:
	if sys.argv[3] == "-f":
		flip = 1

for line in sys.stdin.readlines():
	list = string.split(line)
	for word in list:
		if string.rfind(word, ".jpg") != -1:
			lhs = word[:(string.rfind(word, ".jpg"))]
			os.system("/usr/bin/jpegtopnm "+word+" > /tmp/"+lhs+".pnm");
			os.system("/usr/bin/pnmscale "+str(scale)+" /tmp/"+lhs+".pnm > /tmp/"+lhs+".scaled.pnm")
			last = "/tmp/"+lhs+".scaled.pnm"
			if flip == 1:
				os.system("/usr/bin/pnmflip -lr "+last+" > /tmp/"+lhs+".scaled.fl.pnm")
				last = "/tmp/"+lhs+".scaled.fl.pnm"
			os.system("/usr/bin/ppmtojpeg "+last+" > ./"+lhs+"-s"+str(scale)+".jpg")
			os.unlink("/tmp/"+lhs+".pnm")
			os.unlink("/tmp/"+lhs+".scaled.pnm")
			if flip == 1:
				os.unlink("/tmp/"+lhs+".scaled.fl.pnm")
			print "Converted "+word+" -> "+lhs+"-s"+str(scale)+".jpg"