#!/usr/bin/env python3

import sys
import argparse
import kconfiglib
import re

def findItem(node, name):
    while node:
        if isinstance(node.item, kconfiglib.Symbol):
            if node.item.name == name:
                return node.item.str_value

        if node.list:
            found = findItem(node.list, name)
            if found is not None:
                return found

        node = node.next

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--kconfig", nargs="?", default="Kconfig", help="Top-level Kconfig")
    parser.add_argument("--dotconfig", nargs="?", help=".config")
    parser.add_argument("--input", type=argparse.FileType('r'), help="default.go.in")
    parser.add_argument("--output", type=argparse.FileType('w'), default=sys.stdout, help="Output location")
    args = parser.parse_args()

    kconf = kconfiglib.Kconfig(args.kconfig)
    if args.dotconfig is not None:
        kconf.load_config(args.dotconfig)

    marker = re.compile('.+(@(\w+)@)')
    for line in args.input:
        found = marker.match(line)
        if found:
            print(str.replace(line, found.group(1), findItem(kconf.top_node, found.group(2))), end='', file=args.output)
        else:
            print(line, end='', file=args.output)