#!/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 not (3 <= len(sys.argv) <= 4):
    raise SystemExit("Usage: {} file.map soname_version [file.def]".format(sys.argv[0]))


map_file = pathlib.Path(sys.argv[1])
map_file_version = sys.argv[2].split(".")[0]
map_symbols = set(symbols_from_map(map_file))

if len(sys.argv) == 4:
    def_file = open(sys.argv[3], "w", encoding="utf-8")
else:
    def_file = sys.stdout

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