public async Task PruneWhere(ITextChannel channel, int amount, Func <IMessage, bool> predicate)
{
channel.ThrowIfNull(nameof(channel));
if (amount <= 0)
{
throw new ArgumentOutOfRangeException(nameof(amount));
}
if (!_pruningGuilds.Add(channel.GuildId))
{
return;
}
try
{
IMessage[] msgs;
IMessage lastMessage = null;
msgs = (await channel.GetMessagesAsync(50).Flatten()).Where(predicate).Take(amount).ToArray();
while (amount > 0 && msgs.Any())
{
lastMessage = msgs[msgs.Length - 1];
var bulkDeletable = new List <IMessage>();
var singleDeletable = new List <IMessage>();
foreach (var x in msgs)
{
if (DateTime.UtcNow - x.CreatedAt < twoWeeks)
{
bulkDeletable.Add(x);
}
else
{
singleDeletable.Add(x);
}
}
if (bulkDeletable.Count > 0)
{
await Task.WhenAll(Task.Delay(1000), channel.DeleteMessagesAsync(bulkDeletable)).ConfigureAwait(false);
}
var i = 0;
foreach (var group in singleDeletable.GroupBy(x => ++ i / (singleDeletable.Count / 5)))
{
await Task.WhenAll(Task.Delay(1000), Task.WhenAll(group.Select(x => x.DeleteAsync()))).ConfigureAwait(false);
}
//this isn't good, because this still work as if i want to remove only specific user's messages from the last
//100 messages, Maybe this needs to be reduced by msgs.Length instead of 100
amount -= 50;
if (amount > 0)
{
msgs = (await channel.GetMessagesAsync(lastMessage, Direction.Before, 50).Flatten()).Where(predicate).Take(amount).ToArray();
}
}
}
catch
{
//ignore
}
finally
{
_pruningGuilds.TryRemove(channel.GuildId);
}
}