rebuild_and_fix.py

import subprocess
import re
import sys

print 'building...'
try:
    output = subprocess.check_output(["ninja", "-C", "out/Default", "chrome"],
                                     stderr=subprocess.STDOUT,
                                     shell=False)
    print 'no errors found!'
    sys.exit(0)
except subprocess.CalledProcessError as e:
    output = e.output

missing = []
for line in output.split('\n'):
    match = re.search("no member named '(.*)' in 'blink::UseCounter", line)
    if not match:
        continue
    name = match.group(1)
    if not name in missing:
        missing.append(name)

if not missing:
    print output
    sys.exit(1)

print 'inserting ', missing

filename = '/Users/jdm/src/chromium/src/third_party/WebKit/Source/core/frame/UseCounter.h'
with open(filename, 'r+') as f:
    contents = f.readlines()
    target = contents.index("        // Add new features immediately above this line. Don't change assigned\n")
    previousIndex = target - 1
    while True:
        previous = contents[previousIndex]
        match = re.search("(.*) = (\d+)", previous)
        if match:
            value = int(match.group(2)) + 1
            break
        previousIndex -= 1

    for name in missing:
        contents.insert(target, "        %s = %d,\n" % (name, value))
        value += 1
        target += 1

    contents = ''.join(contents)
    f.seek(0)
    f.write(contents)