i18n.py

import glob
import xml.etree.ElementTree as ET
import os
import sys

def parse_strings(xml_file):
    tree = ET.parse(xml_file)
    root = tree.getroot()
    all_strings = {}

    for child in root:
        name = child.get('name')
        if name in all_strings:
            print 'WARNING! duplicate key %s in %s' % (name, xml_file)
        all_strings[name] = child.text

    return all_strings

def print_missing(missing_set, default_strings):
    for key in missing_set:
        print '<string name="%s">%s</string>' % (key, default_strings[key])

path_to_default = '../res/values/strings.xml'
default_strings = parse_strings(path_to_default)
all_keys = set(default_strings)

values_folders = glob.glob('../res/values-[A-Za-z][A-Za-z]')

for values_folder in values_folders:
    try:
        with open(os.path.join(values_folder, 'strings.xml')) as strings_file:
            translated = parse_strings(strings_file)
            shared = set(translated).intersection(all_keys)
            missing = all_keys - shared
            if missing:
                print >> sys.stderr, 'Missing in %s:' % os.path.abspath(strings_file.name)
                print_missing(missing, default_strings)
                print

    except IOError:
        print "Ignoring %s as it's not an i18n folder" % values_folder