gist:1792149

'''
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
import re

def get_latest_version():
    httpLocation = 'http://www.batman.no/buze/'
    ufile = urllib.urlopen(httpLocation)
    body = ufile.read()
    latestRE = re.compile('(http:.+)?\">Download latest')
    downloadLink = latestRE.search(body).group(1)
    downloadViewLink = downloadLink.replace('.zip', '-pythonview.zip')
    return downloadLink, downloadViewLink

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.endswith('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 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

fileToDownload = [url for url in get_path_info()]
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():
    for url in fileToDownload:
        urllib.urlretrieve(url, new_path)
	os.chdir(new_path)
	unzip_files(os.getcwd())
	os.chdir(original_path)
else:
	print('delete the contents of: ' + new_path)