Python snippet to scan a directory for Drools rule files and report on the total number of rules found. Probably could expand this to count other things...

countrules.py

import re
import os

def count_rules(dir, exts=['.drl', '.dslr']):
    rulecount = 0
    for root, dirs, files in os.walk(dir):
        for file in files:
            if len([file for ext in exts if file.endswith(ext)]) > 0:
              filename = os.path.join(root, file)    
              f = open(filename, "r")
              filetext = "".join(f.readlines())
              f.close()
              rules = re.findall('rule ".+?".+?\nend', filetext, re.DOTALL)
              rulecount += len(rules)
    return rulecount

#Call count_rules with the parent directory that contains all of the rules...
print count_rules('/tmp/testrules')