#!/usr/bin/env python

"""A script to generate MSVC Module-Definition files from version-script
files (which are maintained manually)."""

import re
import sys
import pathlib


def symbols_from_map(path):
    return re.findall(r'^\s+(r?xkb_.*);', path.read_text('utf-8'), re.MULTILINE)


if 2 > len(sys.argv) > 3:
    raise SystemExit("Usage: {} file.map [file.def]".format(sys.argv[0]))


map_file = pathlib.Path(sys.argv[1])
map_symbols = set(symbols_from_map(map_file))

if len(sys.argv) == 3:
    def_file = open(sys.argv[2], "w", encoding="utf-8")
else:
    def_file = sys.stdout

def_file.write("LIBRARY {}\n".format(map_file.stem))
def_file.write("EXPORTS\n")
for symbol in sorted(map_symbols):
    def_file.write("\t{}\n".format(symbol))
