credstash.py 文件源码

def value_or_filename(string):
    # argparse running on old version of python (<2.7) will pass an empty
    # string to this function before it passes the actual value.
    # If an empty string is passes in, just return an empty string
    if string == "":
        return ""

    if string == '-':
        try:
            return sys.stdin.read()
        except KeyboardInterrupt:
            raise argparse.ArgumentTypeError("Unable to read value from stdin")
    elif string[0] == "@":
        filename = string[1:]
        try:
            with open(os.path.expanduser(filename)) as f:
                output = f.read()
        except IOError:
            raise argparse.ArgumentTypeError("Unable to read file %s" %
                                             filename)
    else:
        output = string
    return output