#!/usr/bin/env python
"""
sym_extract - Extract and output a list of symbols from a shared library.
"""
from argparse import ArgumentParser
from sym_check import extract, util


def main():
    parser = ArgumentParser(
        description='Extract a list of symbols from a shared library.')
    parser.add_argument('library', metavar='shared-lib', type=str,
                        help='The library to extract symbols from')
    parser.add_argument('-o', '--output', dest='output',
                        help='The output file. stdout is used if not given',
                        type=str, action='store', default=None)
    parser.add_argument('--names-only', dest='names_only',
                        help='Output only the name of the symbol',
                        action='store_true', default=False)
    args = parser.parse_args()
    if args.output is not None:
        print('Extracting symbols from %s to %s.'
              % (args.library, args.output))
    syms = extract.extract_symbols(args.library)
    util.write_syms(syms, out=args.output, names_only=args.names_only)


if __name__ == '__main__':
    main()