Implement recoding

from karaokatalog.instructions.RecodeInstruction import RecodeInstruction

ENCODINGS_TO_TRY = (

    "utf-8",

    "cp1252",

)

BOM = "\ufeff"  # Byte Order Mark, totally useless for UTF-8, still sometimes there

def try_reading_file_with_encoding(path: Path, encoding: str) -> str:

    with path.open("r", encoding=encoding) as f:

        return f.read()

def guess_encoding(path: Path) -> str:

    for encoding_to_try in ENCODINGS_TO_TRY:

        try:

            content = try_reading_file_with_encoding(path, encoding_to_try)

            if encoding_to_try == "utf-8" and content.startswith(BOM):

                return "utf-8-sig"

            else:

                return encoding_to_try

        except UnicodeDecodeError:

            pass  # This was not the right encoding, let's try again

    raise UnicodeError("Could not guess encoding.")

def recode(paths: Sequence[Path]) -> Sequence[RecodeInstruction]:

    raise NotImplementedError()

    return [

        RecodeInstruction(path, old_encoding=old_encoding, new_encoding="utf-8")

        for path in paths

        if (old_encoding := guess_encoding(path)) != "utf-8"

    ]