clang-tests/gcc-4_2-testsuite/replace-patterns

#!/usr/bin/env python

import os
import optparse
import re
import sys

def main():
    parser = optparse.OptionParser("""\
usage: %%prog [options] { files }*

Print the RUNTESTFLAGS used by DejaGNU to run an individual test.\
""" % locals())
    parser.add_option("-r", "--replace", dest="patterns",
                      metavar="PATTERN=REPLACEMENT",
                      help="define a pattern to replace",
                      type="str", action="append", default=[])

    opts,args = parser.parse_args()

    # Compile the patterns.
    patterns = []
    for pattern in opts.patterns:
        match,sub = pattern.split('=',1)
        match = re.compile(match)
        patterns.append((match,sub))

    # Iterate over all the paths, doing the replacement.
    paths = args
    for path in paths:
        print >>sys.stderr,"scanning %r..." % path

        with open(path) as f:
            orig_data = data = f.read()
            for rex,sub in patterns:
                data = rex.sub(sub, data)

            if data != orig_data:
                f.close()
                with open(path, 'w') as f:
                    f.write(data)
                print >>sys.stderr,"replaced in %r" % path
                    
if __name__ == '__main__':
    main()