FsToolbox/Cli/Helper/LoggingService.cs

using NLog;
using NLog.Config;
using NLog.Targets;

namespace FsToolbox.Cli.Helper
{
    /// <summary>
    ///     Central logging setup using NLog with console and file targets.
    /// </summary>
    public static class LoggingService
    {
        private static bool _initialized;

        /// <summary>
        ///     Configures NLog with console and rolling file targets.
        /// </summary>
        public static void Initialize()
        {
            if (_initialized) return;

            var config = new LoggingConfiguration();
            var layout = "${longdate} | ${uppercase:${level}} | ${logger} | ${message}${onexception:inner=${newline}${exception:format=tostring}}";

            var consoleTarget = new ConsoleTarget("console")
            {
                Layout = layout
            };

            var fileTarget = new FileTarget("file")
            {
                FileName = "${basedir}/logs/fstool.log",
                ArchiveEvery = FileArchivePeriod.Day,
                ArchiveNumbering = ArchiveNumberingMode.Rolling,
                MaxArchiveFiles = 7,
                Layout = layout,
                CreateDirs = true
            };

            config.AddRule(LogLevel.Info, LogLevel.Fatal, consoleTarget);
            config.AddRule(LogLevel.Info, LogLevel.Fatal, fileTarget);

            LogManager.Configuration = config;
            _initialized = true;
        }

        /// <summary>
        ///     Gets a logger for the specified type.
        /// </summary>
        public static Logger GetLogger<T>() => LogManager.GetLogger(typeof(T).FullName);

        /// <summary>
        ///     Gets a logger for the specified name.
        /// </summary>
        public static Logger GetLogger(string name) => LogManager.GetLogger(name);
    }
}