/// <summary>
/// 当其包含 Quote 时, 获取目标 <see cref="MessageChain" />
/// </summary>
/// <param name="chain">包含 <see cref="Quote" /> 的消息链</param>
/// <returns>源消息链</returns>
public static async Task <MessageChain> OfMessageRepliedByAsync(this MessageChain chain)
{
var quote = chain.First(x => x is Quote) as Quote;
var id = MessageChain.Construct(new Source(quote !.MessageId));
var src = await _client.RequestAsync(id);
return(src);
}
/// <summary>
/// 撤回该消息, 如果该消息不含 <see cref="Source" /> 则引发异常
/// </summary>
/// <param name="chain">包含 <see cref="Source" /> 的消息链</param>
/// <returns>
/// <see cref="Task" />
/// </returns>
public static async Task RevokeAsync(this MessageChain chain)
{
await _client.RevokeMessageAsync(((Source)chain.First(x => x is Source)).MessageId);
}