check_source_count.py

#!/usr/bin/env python

# Usage: check_source_count.py SEARCH_TERM COUNT ERROR_LOCATION REPLACEMENT [FILES...]
#   Checks that FILES contains exactly COUNT matches of SEARCH_TERM. If it does
#   not, an error message is printed, quoting ERROR_LOCATION, which should
#   probably be the filename and line number of the erroneous call to
#   check_source_count.py.

import sys
import os
import re

search_string = sys.argv[1]
expected_count = int(sys.argv[2])
error_location = sys.argv[3]
replacement = sys.argv[4]
files = sys.argv[5:]

details = {}

count = 0
for f in files:
    text = file(f).read()
    match = re.findall(search_string, text)
    if match:
        num = len(match)
        count += num
        details[f] = num

if count == expected_count:
    print "TEST-PASS | check_source_count.py %s | %d" % (search_string, expected_count)

else:
    print "TEST-UNEXPECTED-FAIL | check_source_count.py %s | " % (search_string),
    if count < expected_count:
        print "There are fewer occurrences of /%s/ than expected. This may mean that you have removed some, but forgotten to account for it %s." % (search_string, error_location)
    else:
        print "There are more occurrences of /%s/ than expected. We're trying to prevent an increase in the number of %s's, using %s if possible. If it in unavoidable, you should update the expected count %s." % (search_string, search_string, replacement, error_location)

    print "Expected: %d; found: %d" % (expected_count, count)
    for k in sorted(details):
        print "Found %d occurences in %s" % (details[k],k)
    sys.exit(-1)