Generates a list of files relative to a directory. Useful for make files.

rel_path.py

import sys, argparse, os, textwrap

if __name__ == "__main__":	
    parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,
                                     description=textwrap.dedent('''Relative Path Generator
    -----------------------
    Generates a list of files relative to a rootdirectory '''),
                                     epilog='''Written by Peter Respondek''')
    parser.add_argument("-r", help="directories will be relative to this position")
    parser.add_argument("-x", help="only use this file extension")
    parser.add_argument("root", help="root directory")
    argv = parser.parse_args()

    if not os.path.exists(argv.root) or (not argv.r and os.path.exists(argv.r)):
        print ('path not valid')
        sys.exit(2)
    if not argv.r:
        argv.r = argv.root
    #print os.path.commonprefix([argv.root, argv.r])
    for (dirpath, dirnames, filenames) in os.walk(argv.root):
        for file in filenames:
            if argv.x:
                name,ext = os.path.splitext(file)
                if not ext == argv.x:
                    continue
            print (os.path.relpath(os.path.join(dirpath,file), argv.r))