#!/usr/bin/env python
"""
List any modules that are imported from the given package.  This can be used
to determine what needs to be refactored to allow a package to be broken out
into a separately installed package.  The package argument to the script
should be formatted as shown in these examples:

* scripts/dependencies/from_package.py xmodule
* scripts/dependencies/from_package.py openedx/features/course_experience
* scripts/dependencies/from_package.py cms/djangoapps/verify_student

This script counts on scripts/dependencies/enumerate.sh having already
been run in order to generate a dependency data file to work from.
"""
from __future__ import absolute_import, print_function

import os
import re
import sys

pattern = re.compile(u'^{}'.format(sys.argv[1]))

data_path = 'reports/dependencies/dependencies.txt'
if not os.path.exists(data_path):
    print('The dependencies data file is unavailable; run scripts/dependencies/enumerate.sh first.')
with open(data_path, 'r') as f:
    for dep in map(eval, f):
        (from_root, from_name), (to_root, to_name) = dep
        if to_name is None:
            continue
        if pattern.search(from_name) and not pattern.search(to_name):
            # We usually don't care about dependencies between modules in site-packages
            if from_root.endswith(u'site-packages') and to_root.endswith(u'site-packages'):
                continue
            # We don't really care about dependencies on the standard library
            if to_root.startswith('/usr/lib/python') or to_root.endswith('lib/python2.7'):
                continue
            print(dep)