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#!/usr/bin/env python3
# build-aux/kicad-sym-extract - Extract a single symbol from a KiCad symbol library
#
# Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
import os.path
import sys
common = os.path.abspath(os.path.dirname(__file__))
if common not in sys.path:
sys.path.insert(0, common)
import kicad_sexpr # pylint: disable=wrong-import-position
def get_extends(obj: kicad_sexpr.Expr) -> str | None:
if not (
isinstance(obj, list)
and len(obj) > 1
and obj[0] == kicad_sexpr.Symbol("symbol")
):
return None
for child in obj[1:]:
if (
isinstance(child, list)
and len(child) == 2
and child[0] == kicad_sexpr.Symbol("extends")
and isinstance(child[1], str)
):
return child[1]
return None
def should_include(obj: kicad_sexpr.Expr, symnames: list[str]) -> bool:
if (
isinstance(obj, list)
and len(obj) > 1
and obj[0] == kicad_sexpr.Symbol("symbol")
):
return obj[1] in symnames
return True
def main(symnames: list[str]) -> None:
old_sym_lib = kicad_sexpr.unmarshal(sys.stdin.read())
assert isinstance(old_sym_lib, list)
assert len(old_sym_lib) > 1
assert old_sym_lib[0] == kicad_sexpr.Symbol("kicad_symbol_lib")
while True:
new_sym_lib = [
member for member in old_sym_lib if should_include(member, symnames)
]
again = False
for member in new_sym_lib:
extends = get_extends(member)
if extends and extends not in symnames:
symnames.append(extends)
again = True
if not again:
print(kicad_sexpr.marshal(new_sym_lib))
return
if __name__ == "__main__":
main(sys.argv[1:])
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