slow start.

buze_updater.py

'''
py 2.7
assumptions:
- buze is currently running in a dir located outside of program files
- the dir is either formatted like:  buze-x.x.x   or   buze-x.x.x-revision

[x]- read externally the name of latest version and revision. 
[ ]- if version and revision equal current, offer to cease now.

[x]- get current buze path, go up level.
[x]- check if dir called buze-x.x.x[-rev] exists, 
[ ]- - - - if yes create a new one, with rev. (what if that exists too? timestamp? )
[x]- - - - if it does not exist already, 
[x]- - - - - - - create new dir called buze-x.x.x
[x]- get 
	http://www.batman.no/buze/buze-x.x.x.zip
	http://www.batman.no/buze/buze-x.x.x-pythonview.zip
	into new dir.
[x]- unpack all .zip
'''
import urllib
import os
import zipfile

def get_version():
	http_location = 'http://www.digitalaphasia.com/buze_rev/buze_revision.txt'
	ufile = urllib.urlopen(http_location)
	text = ufile.read()
	version = text.split()[1]
	revision = 'rev' # TODO
	return version, revision

def get_urls_and_filenames(version):
	extention = '.zip'
	url_base = 'http://www.batman.no/buze/buze-'
	filename1 = version + extention
	filename2 = version + '-pythonview' + extention
	url1 = url_base + filename1
	url2 = url_base + filename2
	filename1 = 'buze-'+ filename1
	filename2 = 'buze-'+ filename2
	urls = (url1, url2)
	print_url_info(urls)
	return urls, (filename1, filename2)

def print_url_info(urls):
	print('download')
	for url in urls:
		print(url)
	print('\n')

def get_path_info():
	cur_path = os.getcwd()
	separator = os.path.sep
	print('current path')
	print(cur_path)
	cur_dir = cur_path.split(separator)[-1]
	print('current installation directory: ' + cur_dir)
	return cur_path, cur_dir

# warning, do we want to be super vigilent? probably. 
# http://docs.python.org/library/zipfile.html#zipfile.ZipFile.extractall
def unzip_files(new_path):
	filenames = [file for file in os.listdir(new_path) if file[-3:] == 'zip']
	for filename in filenames:
		relative_path_to_file = os.path.join(new_path, filename)
		myzip = zipfile.ZipFile(relative_path_to_file)
		myzip.extractall()
		print('extracted ' + filename) 
		# wait for extraction? how.

def print_current_version(cur_dir):
	# perhaps buze api can provide current version/revision details
	print('current version installed: ' + cur_dir.split('-')[1])

def download_files(new_path, urls, filenames):
	for index, payload_url in enumerate(urls):
		file_path = os.path.join(new_path, filenames[index]) 
		urllib.urlretrieve(payload_url, file_path)

def create_directory():
	# make new directory if not present,
	try:
		os.mkdir(new_path)
		return True
	except OSError:
		print(new_path + ' already exists')
		# empty its contents?
		return False


version, revision = get_version()
urls, filenames = get_urls_and_filenames(version)
original_path, cur_dir = get_path_info()
print_current_version(cur_dir)

new_path = os.path.join(os.pardir, 'buze-' + version + '-' + revision)

if create_directory():
	download_files(new_path, urls, filenames)
	os.chdir(new_path)
	unzip_files(os.getcwd())
	os.chdir(original_path)
else:
	print('delete the contents of: ' + new_path)