MessagePack.UnityEditor CodeGen Missing log information

[eefan000]

I changed it to use OutputDataReceived to receive and store all logs.

MessagePack.Unity.Editor.ProcessHelper.InvokeProcessStartAsync

public static Task<string> InvokeProcessStartAsync(string fileName, string arguments)
{
    var psi = new ProcessStartInfo()
    {
        CreateNoWindow = true,
        StandardOutputEncoding = Encoding.UTF8,
        StandardErrorEncoding = Encoding.UTF8,
        RedirectStandardOutput = true,
        RedirectStandardError = true,
        UseShellExecute = false,
        FileName = fileName,
        Arguments = arguments,
        WorkingDirectory = Application.dataPath
    };
    Process p;
    var log = new StringBuilder();
    try
    {
        p = Process.Start(psi);
        p.OutputDataReceived += (object sender, DataReceivedEventArgs e) =>
        {
            if (e.Data != null)
            {
                log.AppendLine(e.Data);
            }
        };
    }
    catch (Exception ex)
    {
        return Task.FromException<string>(ex);
    }
    var tcs = new TaskCompletionSource<string>();
    p.EnableRaisingEvents = true;
    p.Exited += (object sender, System.EventArgs e) =>
    {
        p.Dispose();
        p = null;
        tcs.TrySetResult(log.ToString());
    };
    return tcs.Task;
}