VRChatの写真をタイムスタンプで整理するやつ

MoveFileByTimestamp.cs

using System;
using System.IO;
using System.Linq;


namespace MoveFileByTimestamp
{
    public class Program
    {
        private static readonly TimeSpan DefaultOffsetTs;
        private static string[] DefaultExts;

        static Program()
        {
            DefaultOffsetTs = new TimeSpan(6, 0, 0);
            DefaultExts = new[] { ".png", ".jpg", ".jpeg" };
        }

        private static int Main(string[] args)
        {
            var ot = DefaultOffsetTs;
            var exts = DefaultExts;

            var targetDir = args.Length > 0 ? args[0] : ".";
            if (!Directory.Exists(targetDir))
            {
                Console.Error.WriteLine($"Target directory doesn't exists: {targetDir}");
                return 1;
            }

            Directory.EnumerateFiles(".")
                .AsParallel()
                .Where(fileName => exts.Any(ext => fileName.EndsWith(ext, StringComparison.OrdinalIgnoreCase)))
                .Select(fileName =>
                {
                    var lwt = File.GetLastWriteTime(fileName);
                    return (FileName: fileName, LastWriteTime: lwt, OffsetLastWriteTime: (lwt - ot).Date);
                })
                .GroupBy(tpl => tpl.OffsetLastWriteTime)
                .ForAll(group =>
                {
                    var ymd = group.Key.ToString("yyyyMMdd");
                    Directory.CreateDirectory(ymd);

                    var dstDirPath = Path.Combine(
                        Path.GetDirectoryName(group.First().FileName),
                        ymd);
                    var nFiles = 0;
                    foreach (var fileName in group.Select(tpl => tpl.FileName))
                    {
                        var dstFilePath = Path.Combine(
                            dstDirPath,
                            Path.GetFileName(fileName));
                        if (!File.Exists(dstFilePath))
                        {
                            File.Move(fileName, dstFilePath);
                        }
                        nFiles++;
                    }
                    Console.WriteLine($"Moved {nFiles} files into {dstDirPath}");
                });

            return 0;
        }
    }
}