import niobot


class MSCGetter(niobot.Module):
    @niobot.command()
    async def msc(self, ctx: niobot.Context, number: str):
        """Fetches the given MSC"""
        if number.startswith("msc"):
            number = number[3:]
        elif number.startswith("#"):
            number = number[1:]
        if not number.isdigit():
            return await ctx.respond("Invalid MXC number.")
        return await ctx.respond(
            "https://github.com/matrix-org/matrix-spec-proposals/pull/" + number
        )