Logger.cs

using System;
using Microsoft.VisualStudio.Shell.Interop;
using System.Globalization;

namespace WakaTime.WakaTime {
    /// <summary>
    /// Singleton class for logging in Visula studio default logger file ActivityLog.xml
    /// </summary>
    class Logger {
        private static Logger _instance;
        private IVsActivityLog _log;

        public static Logger Instance {
            get {
                if (_instance == null) {
                    _instance = new Logger();
                }
                return _instance;
            }
        }

        public void initialize(IVsActivityLog log) {
            _log = log;
        }

        public void error(string message) {
            _log.LogEntry((UInt32)__ACTIVITYLOG_ENTRYTYPE.ALE_ERROR,
                           this.ToString(),
                           string.Format(CultureInfo.CurrentCulture,
                                        "{0}", message));
        }

        public void info(string message) {
            _log.LogEntry((UInt32)__ACTIVITYLOG_ENTRYTYPE.ALE_INFORMATION,
                           this.ToString(),
                           string.Format(CultureInfo.CurrentCulture,
                                        "{0}", message));
        }
    }
}