clone-homeworks

#!/usr/bin/env python
"""A little helper script to checkout our (new) homework repositories

"""

import urllib2

from os.path import exists, join, pardir
from os import system


hw_prefix = "psyc161-hw"

for hw in xrange(1, 100):          # we have only 1 hw, hope for more,
                                   # try to get until we can't
    hw_dir = hw_prefix + str(hw)   # name of homework directory
    hw_path = join(pardir, hw_dir) # full path to homework directory
    hw_url = "https://github.com/dartmouth-pbs/%s" % hw_dir

    if not exists(hw_path):
        # Just to verify if URL (i.e. homework) exists
        try:
            urllib2.urlopen(hw_url)
        except urllib2.URLError:
            print("I: Could not access %s -- there is no more homeworks!"
                  % hw_url)
            break # time to quit -- no more homeworks

        # And if we got here -- bad news -- new homework is out!
        errcode = system('git clone %s %s' % (hw_url, hw_path))

        # Now let's report back in case it was not really successful
        if errcode != 0:
            raise RuntimeError("E: Could not fetch %s -- Try again? Complain to Yarik?"
                               % hw_dir)
        else:
            print("I: Successfully checked out %s -- time to code!" % hw_path)
    else:
        print("I: Directory %s already exists." % hw_path)