Downloads the latest version of MineCraft.

latest_version.py

"""
	Downloads the latest snapshot of MineCraft

	@version 1.0.0
	@author Bheesham Persaud <http://bheesham.com/
	@license Beerware <http://wikipedia.org/wiki/Beerware>
"""
import os
import requests
import re
from BeautifulSoup import BeautifulStoneSoup

def main():
	"First, get the version of the one that we have."
	mc_version = get_version()

	assets_page = "http://assets.minecraft.net/"

	"Second, load the page, and proceed to find the latest one."
	try:
		listings_page = requests.get(assets_page)
	except requests.exceptions.RequestException as e:
		print "Could not load to that page."	
		exit(1)
	
	reg_exp = re.compile("((\d+)w(\d+)a\/minecraft\.jar)")
	xml 		= listings_page.content.lower()
	versions = reg_exp.findall(xml)

	current_version = "%dw%da" % (int(versions[-1][1]), int(versions[-1][2]))

	if current_version != mc_version:
		newest = requests.get(assets_page + versions[-1][0])
		save(newest.content)
		save_version(current_version)
		print "Downloading the latest version (%s)." % current_version 
		print "Got the newest version (%s)!" % current_version
	else:
		print "You already had the latest version."
	
	exit(0)

def save_version(version):
	handle = open("version", "wb")
	handle.write(version)
	handle.close()

def get_version():
	"If it doesn't exist, then create it."
	if os.path.exists("version") == False:
		handle = open("version", "wb")
		handle.write("0")
		handle.close()
	handle = open("version", "rb")
	return handle.read()

def save(contents):
	"""Save contents to minecraft.jar"""
	handle = open("minecraft.jar", "wb")
	handle.write(contents)
	handle.close()

if __name__ == "__main__":
	main()