Logs the Unity console on file.

LogToFile.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace DefaultNamespace
{
    using System;
    using System.IO;
    using System.Text;
    using UnityEngine;

    namespace Scripts.Utils
    {
        /// <summary>
        /// Logs to a file.
        /// </summary>
        [DefaultExecutionOrder(-99999)]
        public class LogToFile : MonoBehaviour
        {
            private string filename = "";

            private void OnEnable()
            {
                Application.logMessageReceived += Log;
            }

            private void OnDisable()
            {
                Application.logMessageReceived -= Log;
            }

            private const string LogTag = "[LOG ERROR]";

            public void OnApplicationQuit()
            {
                // Is not in Editor
                if (Application.platform != RuntimePlatform.WindowsEditor)
                {
                    Application.OpenURL(filename);
                }
            }

            public void Log(string logString, string stackTrace, LogType type)
            {
                if (logString.Contains(LogTag))
                {
                    return;
                }

                if (filename == "")
                {
                    string d = Application.persistentDataPath + "/LOGS";

                    if (!Directory.Exists(d))
                        Directory.CreateDirectory(d);

                    filename = d + "/" + DateTime.UtcNow.ToString("yyyy-MM-d--HH-mm-ss") + ".txt";

                    Debug.Log("[LogToFile] Will log to '" + filename + "'.");
                }

                try
                {
                    StringBuilder toAdd = new StringBuilder();

                    toAdd.AppendLine(logString);

                    if (type == LogType.Exception || type == LogType.Error)
                    {
                        if (!string.IsNullOrWhiteSpace(stackTrace))
                        {
                            toAdd.AppendLine("");
                            toAdd.AppendLine("[BEGIN ERROR STACK TRACE]");
                            toAdd.AppendLine("[=======================]");
                            toAdd.AppendLine(stackTrace);
                            toAdd.AppendLine("[=======================]");
                            toAdd.AppendLine("[END ERROR STACK TRACE]");
                            toAdd.AppendLine("");
                        }
                    }
                    else
                    {
                        toAdd.AppendLine();
                    }

                    File.AppendAllText(filename, toAdd.ToString());
                }
                catch (Exception e)
                {
                    Debug.LogError(LogTag + " Error on log : " + e);
                }
            }
        }
    }
}