clean_names

#!/usr/bin/env python

import sys
import os
import re
import glob

def clean_name(name):
    # return "".join([c for c in name if re.match(r'\w', c)])
    return re.sub(r"[^a-zA-Z0-9._]+", "_", name).lower()

def iter_filenames(maybe_globs):
    # after http://stackoverflow.com/questions/9677312/list-of-files-which-might-contain-wildcards-as-arguments-of-a-python-script
    for maybe_glob in maybe_globs:
        for filename in glob.iglob(maybe_glob):
            yield filename

def append_seqno(name, number):
    filename, extension = os.path.splitext(name)
    return "".join(filename, "_", str(number), extension)
    
def rename_file(old_name, new_name):
    os.rename(old_name, new_name)

def safe_rename(old_name, new_name):
    if old_name == new_name:
        return
    name = new_name
    for idx in xrange(10000 + 1):
        if not os.path.exists(name):
            rename_file(old_name, name)
            return
        name = append_seqno(new_name, idx)
    raise Exception("index over limit, file {} not renamed".format(old_name))

def main():
    for filename in iter_filenames(sys.argv[1:]):
        clean = clean_name(filename)
        if filename == clean:
            print "Filename {} OK. Skipping.".format(filename)
        else:
            print "Renaming {} to {}.".format(filename, clean)
            safe_rename(filename, clean)

if __name__ == "__main__":
    main()