TBConsole/TBConsole/UnityLogHandler.cs

using System;
using System.Threading.Tasks;
using UnityEngine;
using Object = UnityEngine.Object;

namespace TBConsole
{
    public class UnityLogHandler : ILogHandler
    {
        private readonly ILogHandler _original;
        private string _collectedLog = null;
        public UnityLogHandler(ILogHandler original) => _original = original;
        
        public void LogFormat(LogType logType, Object context, string format, params object[] args)
        {
            if (_collectedLog != null)
                _collectedLog += $"{logType} - {string.Format(format, args)} - {context}\n";
            _original.LogFormat(logType, context, format, args);
        }

        public void LogException(Exception exception, Object context)
        {
            _original.LogException(exception, context);
        }

        public void StartCollectingLogMessages() => _collectedLog = "";

        public string FinishCollectingLogMessages()
        {
            string ret = _collectedLog;
            _collectedLog = null;
            return ret;
        }
    }
}