from __future__ import annotations


def add_font(
    font_name: str, font: str | None, defines: list[str], sources: list[str]
) -> None:
    if font is not None:
        font_filename = font.replace("_upper", "").lower()
        defines += [
            "TREZOR_FONT_" + font_name + "_ENABLE=" + font,
            "TREZOR_FONT_" + font_name + '_INCLUDE=\\"' + font_filename + '.h\\"',
        ]
        sourcefile = "embed/lib/fonts/" + font_filename + ".c"
        if sourcefile not in sources:
            sources.append(sourcefile)