include-guard.py

#!/usr/bin/env python

from __future__ import print_function

import sys
import os

for filename in sys.argv[1:]:
    with open(filename, "r") as f:
        lines = f.readlines()

    newguard = "_" + os.path.basename(filename).upper().replace(".", "_") + "_"

    for i, line in enumerate(lines):
        line = line.strip()
        if line.startswith("#ifndef "):
            guard = line[8:]
            if lines[i + 1].strip() == "#define %s" % guard:
                print(filename, ":", guard, "=>", newguard)
                lines[i] = "#ifndef %s\n" % newguard
                lines[i + 1] = "#define %s\n" % newguard
                end = -1
                while not lines[end].strip().startswith("#endif"):
                    end -= 1
                lines[end] = "#endif // %s\n" % newguard
                with open(filename, "w") as f:
                    f.write("".join(lines))
                break