111 lines
4.0 KiB
C#
111 lines
4.0 KiB
C#
#region license
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// This file is part of Vocaluxe.
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//
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// Vocaluxe is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Vocaluxe is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.RegularExpressions;
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namespace VocaluxeLib.Log.Rolling
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{
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static class CLogFileRoller
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{
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public static void RollLogs(string mainLogFile, int numLogsToKeep)
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{
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_DeleteOldLogs(mainLogFile, numLogsToKeep);
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string currentSourceFile = _GenerateRollLogFileName(mainLogFile, numLogsToKeep);
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for (var i = numLogsToKeep; i > 1; i--)
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{
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string currentTargetFile = currentSourceFile;
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currentSourceFile = _GenerateRollLogFileName(mainLogFile, i - 1);
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if (File.Exists(currentSourceFile))
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{
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try
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{
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File.Move(currentSourceFile, currentTargetFile);
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}
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catch (Exception e)
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{
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// Cant log anything here as the log isn't initialized yet
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#if DEBUG
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Console.WriteLine($"Error moving old log file: {e.Message}");
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#endif
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}
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}
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}
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if (File.Exists(mainLogFile))
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{
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try
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{
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if (numLogsToKeep > 0)
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File.Move(mainLogFile, currentSourceFile);
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else
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File.Delete(mainLogFile);
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}
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catch (Exception e)
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{
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// Cant log anything here as the log isn't initialized yet
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#if DEBUG
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Console.WriteLine($"Error moving old main log file: {e.Message}");
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#endif
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}
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}
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}
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private static void _DeleteOldLogs(string mainLogFile, int numLogsToKeep)
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{
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Regex r = new Regex($"{Regex.Escape(Path.GetDirectoryName(mainLogFile)??"")}\\{Path.DirectorySeparatorChar}{Regex.Escape(Path.GetFileNameWithoutExtension(mainLogFile)??"")}_([0-9]+){Path.GetExtension(mainLogFile)}", RegexOptions.IgnoreCase);
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IEnumerable<string> logFiles = Directory.EnumerateFiles($"{Path.GetDirectoryName(mainLogFile)}", $"{Path.GetFileNameWithoutExtension(mainLogFile)}*{Path.GetExtension(mainLogFile)}");
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foreach (string file in logFiles)
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{
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Match m = r.Match(file);
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if (m.Success)
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{
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int logNum = -1;
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Int32.TryParse(m.Groups[1].Value, out logNum);
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if (logNum < 0 || logNum > numLogsToKeep - 1)
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{
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try
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{
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File.Delete(file);
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}
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catch (Exception e)
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{
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// Cant log anything here as the log isn't initialized yet
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#if DEBUG
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Console.WriteLine($"Error deleting old log file: {e.Message}");
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#endif
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}
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}
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}
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}
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}
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private static string _GenerateRollLogFileName(string mainLogFile, int number)
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{
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return $"{ Path.GetDirectoryName(mainLogFile) }{ Path.DirectorySeparatorChar }{ Path.GetFileNameWithoutExtension(mainLogFile) }_{ number }{ Path.GetExtension(mainLogFile) }";
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}
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}
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}
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