Super primitive. Expects one class per line. Did the job

remove_css_classes.py

from subprocess import Popen, PIPE
import sys
import re
import os

APP_DIR = '/Users/artur/Work/Codecademy-dev/Codecademy/app/'
VIEWS = ['erb', 'mustache', 'haml']

def search(query, filetypes=[]):
    args = ['grep', '-r', '-I', '--exclude=".git"']
    if len(filetypes) > 0:
        args.append('--include=*.{%s}' % ','.join(filetypes))
    args += [query, APP_DIR]

    return os.popen(' '.join(args)).readlines()

def main(argv):
    with open(argv[0]) as deprecate:
        contents = deprecate.readlines()

    remove_us = []

    classnames = re.findall(r'\.[\w\-\_]+', '\n'.join(contents))

    for name in classnames:
        if len(name) < 3:
            continue
        matches = search(name[1:], VIEWS)
        num = len(matches)
        print "%s matches for %s" % (num, name[1:])
        if num > 0:
            files_matching = map(lambda x: re.match(r'.*:', x), matches)
            print '\n'.join(matches)
        else:
            remove_us.append(name)

    print remove_us
    new_contents = []
    for line in contents:
        if reduce(lambda a, x: a or (x[1:] in line), remove_us, False):
            pass # Removing
        else:
            # Keeping
            new_contents.append(line)

    with open('%s.new' % argv[0], 'w') as updated:
        updated.writelines(new_contents)



if __name__ == '__main__':
  sys.exit(main(sys.argv[1:]))