Replace file contents while traversing all subdirectories

regexpReplaceFiles.py

#!/bin/env python


def printUsage():
    import sys
    print("%s <regexp-search> <regexp-replace> <wildcard>" % sys.argv[0])
    print("Example: %s \"<td>[0-9]*</td>\\r\\n\" 0 *.html" % sys.argv[0])


def doreplace(r, search, replace):
    orig = r.read();
    import re
    prev = '?????!?!?!?!?!'
    data = orig
    while data != prev:
        prev = data
        data = re.sub(search, replace, data, flags=re.MULTILINE);
    if data != orig:
        return data


def main():
    import sys
    args = sys.argv;
    if len(args) != 4:
        printUsage();
        sys.exit(1)
    import glob, os
    search, replace, wildcard = args[1:4]
    fls = glob.glob(wildcard, recursive=True)
    for fn in fls:
        outfn = fn+".tmp"
        try:
            with open(fn, "rt") as r:
                outdata = doreplace(r, search, replace)
                if outdata:
                    with open(outfn, "wt") as w:
                        w.write(outdata);
                    os.remove(fn)
                    os.rename(outfn, fn)
                    print("Replaced in " + fn)
        except Exception as ex:
            try:
                os.remove(outfn)
            except:
                pass
            print("Could not replace in", fn, "reason:", type(ex), ex)


if __name__ == "__main__":
    main()