/// <summary>
/// Catches an <see cref="Exception"/> and sends its information to this message channel.
/// </summary>
public static async Task <IUserMessage> CatchAsync(this IMessageChannel channel,
Exception ex,
StackTraceMode stackTraceMode = StackTraceMode.Simple,
RequestOptions options = null,
AllowedMentions allowedMentions = null)
{
var error = new StringBuilder();
error.AppendLine("> **Yikes!**");
error.AppendLine("> An exception has been thrown.");
if (ex == null)
{
return(await channel.SendMessageAsync(error.ToString(), options : options, allowedMentions : allowedMentions));
}
if (!string.IsNullOrWhiteSpace(ex.Message))
{
error.AppendLine("```");
error.AppendLine(ex.Message);
error.Append("```");
}
if (string.IsNullOrWhiteSpace(ex.StackTrace) || stackTraceMode == StackTraceMode.None)
{
return(await channel.SendMessageAsync(error.ToString(), options : options, allowedMentions : allowedMentions));
}
error.AppendLine();
error.Append(GetStackTrace(ex.StackTrace, stackTraceMode, error.Length));
return(await channel.SendMessageAsync(error.ToString(), options : options, allowedMentions : allowedMentions));
}
private static string GetStackTrace(string stackTrace, StackTraceMode traceMode, int messageLength)
{
if (traceMode == StackTraceMode.None || string.IsNullOrWhiteSpace(stackTrace))
{
return(null);
}
var result = new StringBuilder();
result.AppendLine($"> **Stack Trace**");
switch (traceMode)
{
case StackTraceMode.Simple:
if (!StackTracePath.TryParse(stackTrace, out List <StackTracePath> paths))
{
return(null);
}
StackTracePath path = paths.FirstOrDefault(x => !string.IsNullOrWhiteSpace(x.Path)) ?? paths.First();
if (path.Method.Length + messageLength + 7 >= 2000)
{
break;
}
result.AppendLine($"• at `{path.Method}`");
if (string.IsNullOrWhiteSpace(path.Path))
{
break;
}
string marker = path.LineIndex.HasValue ? $" (Line **{path.LineIndex.Value:##,0}**)" : "";
if (marker.Length + path.Path.Length + messageLength + 7 >= 2000)
{
break;
}
result.AppendLine($"• in `{path.Path}`{marker}");
break;
default:
string[] errorPaths = stackTrace.Split('\n', StringSplitOptions.RemoveEmptyEntries);
if (errorPaths.Length == 0 || messageLength + result.Length + errorPaths[0].Length + 8 >= 2000)
{
break;
}
result.AppendLine("```bf");
foreach (string errorPath in errorPaths)
{
if (messageLength + result.Length + errorPath.Length + 3 >= 2000)
{
break;
}
result.AppendLine(errorPath);
}
result.Append("```");
break;
}
return(result.ToString());
}
