Clean up

Co-authored-by: Tyrrrz <1935960+Tyrrrz@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

DiscordChatExporter.Cli.Tests/Specs/HtmlContentSpecs.cs

@@ -1,7 +1,12 @@
-using System.Linq;
+using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using AngleSharp.Dom;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands;
 using DiscordChatExporter.Cli.Tests.Infra;
+using DiscordChatExporter.Cli.Tests.Utils;
+using DiscordChatExporter.Core.Exporting;
 using FluentAssertions;
 using Xunit;
 
@@ -44,4 +49,41 @@ public class HtmlContentSpecs
                 "Yeet"
             );
     }
+
+    [Fact]
+    public async Task I_can_export_a_channel_in_the_HTML_format_in_the_reverse_order()
+    {
+        // Arrange
+        using var file = TempFile.Create();
+
+        // Act
+        await new ExportChannelsCommand
+        {
+            Token = Secrets.DiscordToken,
+            ChannelIds = [ChannelIds.DateRangeTestCases],
+            ExportFormat = ExportFormat.HtmlDark,
+            OutputPath = file.Path,
+            Locale = "en-US",
+            IsUtcNormalizationEnabled = true,
+            IsReverseMessageOrder = true,
+        }.ExecuteAsync(new FakeConsole());
+
+        var document = Html.Parse(await File.ReadAllTextAsync(file.Path));
+        var messages = document.QuerySelectorAll("[data-message-id]").ToArray();
+
+        // Assert
+        messages
+            .Select(e => e.GetAttribute("data-message-id"))
+            .Should()
+            .Equal(
+                "885169254029213696",
+                "868505973294268457",
+                "868505969821364245",
+                "868505966528835604",
+                "868490009366396958",
+                "866732113319428096",
+                "866710679758045195",
+                "866674314627121232"
+            );
+    }
 }

DiscordChatExporter.Cli.Tests/Specs/JsonContentSpecs.cs

@@ -1,7 +1,13 @@
-using System.Linq;
+using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands;
 using DiscordChatExporter.Cli.Tests.Infra;
+using DiscordChatExporter.Cli.Tests.Utils;
+using DiscordChatExporter.Core.Exporting;
 using FluentAssertions;
+using JsonExtensions;
 using Xunit;
 
 namespace DiscordChatExporter.Cli.Tests.Specs;
@@ -43,4 +49,43 @@ public class JsonContentSpecs
                 "Yeet"
             );
     }
+
+    [Fact]
+    public async Task I_can_export_a_channel_in_the_JSON_format_in_the_reverse_order()
+    {
+        // Arrange
+        using var file = TempFile.Create();
+
+        // Act
+        await new ExportChannelsCommand
+        {
+            Token = Secrets.DiscordToken,
+            ChannelIds = [ChannelIds.DateRangeTestCases],
+            ExportFormat = ExportFormat.Json,
+            OutputPath = file.Path,
+            Locale = "en-US",
+            IsUtcNormalizationEnabled = true,
+            IsReverseMessageOrder = true,
+        }.ExecuteAsync(new FakeConsole());
+
+        var messages = Json.Parse(await File.ReadAllTextAsync(file.Path))
+            .GetProperty("messages")
+            .EnumerateArray()
+            .ToArray();
+
+        // Assert
+        messages
+            .Select(j => j.GetProperty("id").GetString())
+            .Should()
+            .Equal(
+                "885169254029213696",
+                "868505973294268457",
+                "868505969821364245",
+                "868505966528835604",
+                "868490009366396958",
+                "866732113319428096",
+                "866710679758045195",
+                "866674314627121232"
+            );
+    }
 }

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -83,6 +83,12 @@ public abstract class ExportCommandBase : DiscordCommandBase
     )]
     public int ParallelLimit { get; init; } = 1;
 
+    [CommandOption(
+        "reverse",
+        Description = "Export messages in reverse chronological order (newest first)."
+    )]
+    public bool IsReverseMessageOrder { get; init; }
+
     [CommandOption(
         "markdown",
         Description = "Process markdown, mentions, and other special tokens."
@@ -267,6 +273,7 @@ public abstract class ExportCommandBase : DiscordCommandBase
                                         Before,
                                         PartitionLimit,
                                         MessageFilter,
+                                        IsReverseMessageOrder,
                                         ShouldFormatMarkdown,
                                         ShouldDownloadAssets,
                                         ShouldReuseAssets,

DiscordChatExporter.Core/Discord/Data/EmojiIndex.cs

@@ -8855,6 +8855,8 @@ internal static class EmojiIndex
         ["united_nations"] = "🇺🇳",
     };
 
+    public static IReadOnlyCollection<string> GetAllNames() => _toCodes.Keys;
+
     public static string? TryGetCode(string name) => _toCodes.GetValueOrDefault(name);
 
     public static string? TryGetName(string code) => _fromCodes.GetValueOrDefault(code);

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -194,6 +194,23 @@ public class DiscordClient(
         return Application.Parse(response);
     }
 
+    private async ValueTask EnsureMessageContentIntentAsync(
+        CancellationToken cancellationToken = default
+    )
+    {
+        if (await ResolveTokenKindAsync(cancellationToken) != TokenKind.Bot)
+            return;
+
+        var application = await GetApplicationAsync(cancellationToken);
+        if (application.IsMessageContentIntentEnabled)
+            return;
+
+        throw new DiscordChatExporterException(
+            "Provided bot account is missing the MESSAGE_CONTENT privileged intent.",
+            true
+        );
+    }
+
     public async ValueTask<User?> TryGetUserAsync(
         Snowflake userId,
         CancellationToken cancellationToken = default
@@ -429,6 +446,11 @@ public class DiscordClient(
             .Where(c => before is null || c.MayHaveMessagesBefore(before.Value))
             .ToArray();
 
+        // Track yielded thread IDs to avoid duplicates that can occur when a thread transitions
+        // from active to archived between the two separate API calls used to fetch threads.
+        // https://github.com/Tyrrrz/DiscordChatExporter/issues/1433
+        var seenThreadIds = new HashSet<Snowflake>();
+
         // User accounts can only fetch threads using the search endpoint
         if (await ResolveTokenKindAsync(cancellationToken) == TokenKind.User)
         {
@@ -472,7 +494,9 @@ public class DiscordClient(
                                 break;
                             }
 
-                            yield return thread;
+                            if (seenThreadIds.Add(thread.Id))
+                                yield return thread;
+
                             currentOffset++;
                         }
 
@@ -511,7 +535,12 @@ public class DiscordClient(
                         .Pipe(parentsById.GetValueOrDefault);
 
                     if (filteredChannels.Contains(parent))
-                        yield return Channel.Parse(threadJson, parent);
+                    {
+                        var thread = Channel.Parse(threadJson, parent);
+
+                        if (seenThreadIds.Add(thread.Id))
+                            yield return thread;
+                    }
                 }
             }
 
@@ -547,12 +576,14 @@ public class DiscordClient(
                             )
                             {
                                 var thread = Channel.Parse(threadJson, channel);
-                                yield return thread;
 
                                 currentBefore = threadJson
                                     .GetProperty("thread_metadata")
                                     .GetProperty("archive_timestamp")
                                     .GetString();
+
+                                if (seenThreadIds.Add(thread.Id))
+                                    yield return thread;
                             }
 
                             if (!response.Value.GetProperty("has_more").GetBoolean())
@@ -564,6 +595,24 @@ public class DiscordClient(
         }
     }
 
+    private async ValueTask<Message?> TryGetFirstMessageAsync(
+        Snowflake channelId,
+        Snowflake? after = null,
+        CancellationToken cancellationToken = default
+    )
+    {
+        var url = new UrlBuilder()
+            .SetPath($"channels/{channelId}/messages")
+            .SetQueryParameter("limit", "1")
+            .SetQueryParameter("after", (after ?? Snowflake.Zero).ToString())
+            .Build();
+
+        var response = await GetJsonResponseAsync(url, cancellationToken);
+        var message = response.EnumerateArray().Select(Message.Parse).FirstOrDefault();
+
+        return message;
+    }
+
     private async ValueTask<Message?> TryGetLastMessageAsync(
         Snowflake channelId,
         Snowflake? before = null,
@@ -624,20 +673,8 @@ public class DiscordClient(
             // If all messages are empty, make sure that it's not because the bot account doesn't
             // have the Message Content Intent enabled.
             // https://github.com/Tyrrrz/DiscordChatExporter/issues/1106#issuecomment-1741548959
-            if (
-                messages.All(m => m.IsEmpty)
-                && await ResolveTokenKindAsync(cancellationToken) == TokenKind.Bot
-            )
-            {
-                var application = await GetApplicationAsync(cancellationToken);
-                if (!application.IsMessageContentIntentEnabled)
-                {
-                    throw new DiscordChatExporterException(
-                        "Provided bot account does not have the Message Content Intent enabled.",
-                        true
-                    );
-                }
-            }
+            if (messages.All(m => m.IsEmpty))
+                await EnsureMessageContentIntentAsync(cancellationToken);
 
             foreach (var message in messages)
             {
@@ -670,6 +707,76 @@ public class DiscordClient(
         }
     }
 
+    public async IAsyncEnumerable<Message> GetMessagesInReverseAsync(
+        Snowflake channelId,
+        Snowflake? after = null,
+        Snowflake? before = null,
+        IProgress<Percentage>? progress = null,
+        [EnumeratorCancellation] CancellationToken cancellationToken = default
+    )
+    {
+        // Get the first message in the specified range, so we can later calculate the
+        // progress based on the difference between message timestamps.
+        // Snapshotting is not necessary here because new messages can't appear in the past.
+        var firstMessage = await TryGetFirstMessageAsync(channelId, after, cancellationToken);
+
+        if (firstMessage is null || firstMessage.Timestamp > before?.ToDate())
+            yield break;
+
+        // Keep track of the last message in range in order to calculate the progress
+        var lastMessage = default(Message);
+
+        var currentBefore = before;
+        while (true)
+        {
+            var url = new UrlBuilder()
+                .SetPath($"channels/{channelId}/messages")
+                .SetQueryParameter("limit", "100")
+                .SetQueryParameter("before", currentBefore?.ToString())
+                .Build();
+
+            var response = await GetJsonResponseAsync(url, cancellationToken);
+
+            var messages = response.EnumerateArray().Select(Message.Parse).ToArray();
+
+            // Break if there are no messages (can happen if messages are deleted during execution)
+            if (!messages.Any())
+                yield break;
+
+            // If all messages are empty, make sure that it's not because the bot account doesn't
+            // have the Message Content Intent enabled.
+            // https://github.com/Tyrrrz/DiscordChatExporter/issues/1106#issuecomment-1741548959
+            if (messages.All(m => m.IsEmpty))
+                await EnsureMessageContentIntentAsync(cancellationToken);
+
+            foreach (var message in messages)
+            {
+                lastMessage ??= message;
+
+                // Report progress based on timestamps
+                if (progress is not null)
+                {
+                    var exportedDuration = (lastMessage.Timestamp - message.Timestamp).Duration();
+                    var totalDuration = (lastMessage.Timestamp - firstMessage.Timestamp).Duration();
+
+                    progress.Report(
+                        Percentage.FromFraction(
+                            // Avoid division by zero if all messages have the exact same timestamp
+                            // (which happens when there's only one message in the channel)
+                            totalDuration > TimeSpan.Zero
+                                ? exportedDuration / totalDuration
+                                : 1
+                        )
+                    );
+                }
+
+                yield return message;
+            }
+
+            currentBefore = messages.Last().Id;
+        }
+    }
+
     public async IAsyncEnumerable<User> GetMessageReactionsAsync(
         Snowflake channelId,
         Snowflake messageId,

DiscordChatExporter.Core/Exporting/ChannelExporter.cs

@@ -64,15 +64,23 @@ public class ChannelExporter(DiscordClient discord)
             );
         }
 
-        await foreach (
-            var message in discord.GetMessagesAsync(
+        var messages = !request.IsReverseMessageOrder
+            ? discord.GetMessagesAsync(
                 request.Channel.Id,
                 request.After,
                 request.Before,
                 progress,
                 cancellationToken
             )
-        )
+            : discord.GetMessagesInReverseAsync(
+                request.Channel.Id,
+                request.After,
+                request.Before,
+                progress,
+                cancellationToken
+            );
+
+        await foreach (var message in messages)
         {
             try
             {

DiscordChatExporter.Core/Exporting/ExportAssetDownloader.cs

@@ -37,6 +37,28 @@ internal partial class ExportAssetDownloader(string workingDirPath, bool reuse)
         if (reuse && File.Exists(filePath))
             return _previousPathsByUrl[url] = filePath;
 
+        // Check for a file cached by the legacy naming scheme (5-char hash) and rename it
+        // to the new naming scheme to preserve backwards compatibility with existing exports
+        if (reuse)
+        {
+            var legacyFilePath = Path.Combine(workingDirPath, GetLegacyFileNameFromUrl(url));
+            if (File.Exists(legacyFilePath))
+            {
+                // Overwrite in case the destination file was created concurrently between our
+                // earlier existence check and this move operation
+                try
+                {
+                    File.Move(legacyFilePath, filePath, overwrite: true);
+                    return _previousPathsByUrl[url] = filePath;
+                }
+                catch (IOException)
+                {
+                    // The legacy file was moved or deleted concurrently or something else happened.
+                    // Upgrading old files is not crucial, so we can just move on.
+                }
+            }
+        }
+
         Directory.CreateDirectory(workingDirPath);
 
         await Http.ResiliencePipeline.ExecuteAsync(
@@ -56,34 +78,23 @@ internal partial class ExportAssetDownloader(string workingDirPath, bool reuse)
 
 internal partial class ExportAssetDownloader
 {
-    private static string GetUrlHash(string url)
+    private static string NormalizeUrl(string url)
     {
         // Remove signature parameters from Discord CDN URLs to normalize them
-        static string NormalizeUrl(string url)
-        {
-            var uri = new Uri(url);
-            if (!string.Equals(uri.Host, "cdn.discordapp.com", StringComparison.OrdinalIgnoreCase))
-                return url;
+        var uri = new Uri(url);
+        if (!string.Equals(uri.Host, "cdn.discordapp.com", StringComparison.OrdinalIgnoreCase))
+            return url;
 
-            var query = HttpUtility.ParseQueryString(uri.Query);
-            query.Remove("ex");
-            query.Remove("is");
-            query.Remove("hm");
+        var query = HttpUtility.ParseQueryString(uri.Query);
+        query.Remove("ex");
+        query.Remove("is");
+        query.Remove("hm");
 
-            return uri.GetLeftPart(UriPartial.Path) + query;
-        }
-
-        return SHA256
-            .HashData(Encoding.UTF8.GetBytes(NormalizeUrl(url)))
-            .Pipe(Convert.ToHexStringLower)
-            // 5 chars ought to be enough for anybody
-            .Truncate(5);
+        return uri.GetLeftPart(UriPartial.Path) + query;
     }
 
-    private static string GetFileNameFromUrl(string url)
+    private static string GetFileNameFromUrl(string url, string urlHash)
     {
-        var urlHash = GetUrlHash(url);
-
         // Try to extract the file name from URL
         var fileName = Regex.Match(url, @".+/([^?]*)").Groups[1].Value;
 
@@ -107,4 +118,25 @@ internal partial class ExportAssetDownloader
             fileNameWithoutExtension.Truncate(42) + '-' + urlHash + fileExtension
         );
     }
+
+    private static string GetFileNameFromUrl(string url) =>
+        GetFileNameFromUrl(
+            url,
+            // 16 chars = 64 bits, reaches 1% collision probability at ~609 million files
+            SHA256
+                .HashData(Encoding.UTF8.GetBytes(NormalizeUrl(url)))
+                .Pipe(Convert.ToHexStringLower)
+                .Truncate(16)
+        );
+
+    // Legacy naming used a 5-char hash, kept for backwards compatibility with existing exports
+    private static string GetLegacyFileNameFromUrl(string url) =>
+        GetFileNameFromUrl(
+            url,
+            SHA256
+                .HashData(Encoding.UTF8.GetBytes(NormalizeUrl(url)))
+                .Pipe(Convert.ToHexStringLower)
+                // 5 chars = 20 bits, reaches 1% collision probability at ~145 files
+                .Truncate(5)
+        );
 }

DiscordChatExporter.Core/Exporting/ExportRequest.cs

@@ -33,6 +33,8 @@ public partial class ExportRequest
 
     public MessageFilter MessageFilter { get; }
 
+    public bool IsReverseMessageOrder { get; }
+
     public bool ShouldFormatMarkdown { get; }
 
     public bool ShouldDownloadAssets { get; }
@@ -55,6 +57,7 @@ public partial class ExportRequest
         Snowflake? before,
         PartitionLimit partitionLimit,
         MessageFilter messageFilter,
+        bool isReverseMessageOrder,
         bool shouldFormatMarkdown,
         bool shouldDownloadAssets,
         bool shouldReuseAssets,
@@ -69,6 +72,7 @@ public partial class ExportRequest
         Before = before;
         PartitionLimit = partitionLimit;
         MessageFilter = messageFilter;
+        IsReverseMessageOrder = isReverseMessageOrder;
         ShouldFormatMarkdown = shouldFormatMarkdown;
         ShouldDownloadAssets = shouldDownloadAssets;
         ShouldReuseAssets = shouldReuseAssets;

DiscordChatExporter.Core/Exporting/HtmlMessageWriter.cs

@@ -17,6 +17,7 @@ internal class HtmlMessageWriter(Stream stream, ExportContext context, string th
     private readonly HtmlMinifier _minifier = new();
     private readonly List<Message> _messageGroup = [];
 
+    // Note: in reverse order, last message appears earlier than the first message
     private bool CanJoinGroup(Message message)
     {
         // If the group is empty, any message can join it

DiscordChatExporter.Core/Exporting/PlainTextMessageExtensions.cs

@@ -23,13 +23,11 @@ internal static class PlainTextMessageExtensions
                     : "Removed a recipient.",
 
                 MessageKind.Call =>
-                    $"Started a call that lasted {
-                        message
+                    $"Started a call that lasted {message
                             .CallEndedTimestamp?
                             .Pipe(t => t - message.Timestamp)
                             .Pipe(t => t.TotalMinutes)
-                            .ToString("n0", CultureInfo.InvariantCulture) ?? "0"
-                    } minutes.",
+                            .ToString("n0", CultureInfo.InvariantCulture) ?? "0"} minutes.",
 
                 MessageKind.ChannelNameChange => !string.IsNullOrWhiteSpace(message.Content)
                     ? $"Changed the channel name: {message.Content}"

DiscordChatExporter.Core/Markdown/Parsing/MarkdownParser.cs

@@ -208,53 +208,18 @@ internal static partial class MarkdownParser
     private static readonly IMatcher<MarkdownContext, MarkdownNode> StandardEmojiNodeMatcher =
         new RegexMatcher<MarkdownContext, MarkdownNode>(
             new Regex(
-                @"("
-                    +
-                    // Country flag emoji (two regional indicator surrogate pairs)
-                    @"(?:\uD83C[\uDDE6-\uDDFF]){2}|"
-                    +
-                    // Digit emoji (digit followed by enclosing mark)
-                    @"\d\p{Me}|"
-                    +
-                    // Surrogate pair
-                    @"\p{Cs}{2}|"
-                    +
-                    // Miscellaneous characters
-                    @"["
-                    + @"\u2600-\u2604"
-                    + @"\u260E\u2611"
-                    + @"\u2614-\u2615"
-                    + @"\u2618\u261D\u2620"
-                    + @"\u2622-\u2623"
-                    + @"\u2626\u262A"
-                    + @"\u262E-\u262F"
-                    + @"\u2638-\u263A"
-                    + @"\u2640\u2642"
-                    + @"\u2648-\u2653"
-                    + @"\u265F-\u2660"
-                    + @"\u2663"
-                    + @"\u2665-\u2666"
-                    + @"\u2668\u267B"
-                    + @"\u267E-\u267F"
-                    + @"\u2692-\u2697"
-                    + @"\u2699"
-                    + @"\u269B-\u269C"
-                    + @"\u26A0-\u26A1"
-                    + @"\u26A7"
-                    + @"\u26AA-\u26AB"
-                    + @"\u26B0-\u26B1"
-                    + @"\u26BD-\u26BE"
-                    + @"\u26C4-\u26C5"
-                    + @"\u26C8"
-                    + @"\u26CE-\u26CF"
-                    + @"\u26D1"
-                    + @"\u26D3-\u26D4"
-                    + @"\u26E9-\u26EA"
-                    + @"\u26F0-\u26F5"
-                    + @"\u26F7-\u26FA"
-                    + @"\u26FD"
-                    + @"]"
-                    + @")",
+                // Build a pattern from all known emoji, sorted longest-first so that compound
+                // emoji (e.g. sequences with ZWJ or skin-tone modifiers) are matched before
+                // their individual components.
+                "("
+                    + string.Join(
+                        "|",
+                        EmojiIndex
+                            .GetAllNames()
+                            .OrderByDescending(e => e.Length)
+                            .Select(Regex.Escape)
+                    )
+                    + ")",
                 DefaultRegexOptions
             ),
             (_, _, m) => new EmojiNode(m.Groups[1].Value)

DiscordChatExporter.Gui/Localization/LocalizationManager.English.cs

@@ -104,6 +104,9 @@ public partial class LocalizationManager
             [nameof(MessageFilterLabel)] = "Message filter",
             [nameof(MessageFilterTooltip)] =
                 "Only include messages that satisfy this filter (e.g. 'from:foo#1234' or 'has:image'). See the documentation for more info.",
+            [nameof(ReverseMessageOrderLabel)] = "Reverse messages",
+            [nameof(ReverseMessageOrderTooltip)] =
+                "Export messages in reverse chronological order (newest first)",
             [nameof(FormatMarkdownLabel)] = "Format markdown",
             [nameof(FormatMarkdownTooltip)] =
                 "Process markdown, mentions, and other special tokens",

DiscordChatExporter.Gui/Localization/LocalizationManager.French.cs

@@ -106,6 +106,9 @@ public partial class LocalizationManager
         [nameof(MessageFilterLabel)] = "Filtre de messages",
         [nameof(MessageFilterTooltip)] =
             "Inclure uniquement les messages satisfaisant ce filtre (ex. 'from:foo#1234' ou 'has:image'). Voir la documentation pour plus d'informations.",
+        [nameof(ReverseMessageOrderLabel)] = "Inverser l'ordre des messages",
+        [nameof(ReverseMessageOrderTooltip)] =
+            "Exporter les messages en ordre chronologique inversé (les plus récents en premier)",
         [nameof(FormatMarkdownLabel)] = "Formater le markdown",
         [nameof(FormatMarkdownTooltip)] =
             "Traiter le markdown, les mentions et autres tokens spéciaux",

DiscordChatExporter.Gui/Localization/LocalizationManager.German.cs

@@ -110,6 +110,9 @@ public partial class LocalizationManager
         [nameof(MessageFilterLabel)] = "Nachrichtenfilter",
         [nameof(MessageFilterTooltip)] =
             "Nur Nachrichten einschließen, die diesem Filter entsprechen (z. B. 'from:foo#1234' oder 'has:image'). Weitere Informationen finden Sie in der Dokumentation.",
+        [nameof(ReverseMessageOrderLabel)] = "Nachrichtenreihenfolge umkehren",
+        [nameof(ReverseMessageOrderTooltip)] =
+            "Nachrichten in umgekehrter chronologischer Reihenfolge exportieren (neueste zuerst)",
         [nameof(FormatMarkdownLabel)] = "Markdown formatieren",
         [nameof(FormatMarkdownTooltip)] =
             "Markdown, Erwähnungen und andere spezielle Token verarbeiten",

DiscordChatExporter.Gui/Localization/LocalizationManager.Spanish.cs

@@ -104,6 +104,9 @@ public partial class LocalizationManager
             [nameof(MessageFilterLabel)] = "Filtro de mensajes",
             [nameof(MessageFilterTooltip)] =
                 "Solo incluir mensajes que satisfagan este filtro (p. ej. 'from:foo#1234' o 'has:image'). Consulte la documentación para más información.",
+            [nameof(ReverseMessageOrderLabel)] = "Invertir orden de mensajes",
+            [nameof(ReverseMessageOrderTooltip)] =
+                "Exportar mensajes en orden cronológico inverso (los más recientes primero)",
             [nameof(FormatMarkdownLabel)] = "Formatear markdown",
             [nameof(FormatMarkdownTooltip)] =
                 "Procesar markdown, menciones y otros tokens especiales",

DiscordChatExporter.Gui/Localization/LocalizationManager.Ukrainian.cs

@@ -104,6 +104,9 @@ public partial class LocalizationManager
             [nameof(MessageFilterLabel)] = "Фільтр повідомлень",
             [nameof(MessageFilterTooltip)] =
                 "Включати лише повідомлення, що відповідають цьому фільтру (напр. 'from:foo#1234' або 'has:image'). Дивіться документацію для більш детальної інформації.",
+            [nameof(ReverseMessageOrderLabel)] = "Зворотній порядок повідомлень",
+            [nameof(ReverseMessageOrderTooltip)] =
+                "Експортувати повідомлення у зворотному хронологічному порядку (найновіші спочатку)",
             [nameof(FormatMarkdownLabel)] = "Форматувати markdown",
             [nameof(FormatMarkdownTooltip)] =
                 "Обробляти markdown, згадки та інші спеціальні токени",

DiscordChatExporter.Gui/Localization/LocalizationManager.cs

@@ -135,6 +135,8 @@ public partial class LocalizationManager
     public string PartitionLimitTooltip => Get();
     public string MessageFilterLabel => Get();
     public string MessageFilterTooltip => Get();
+    public string ReverseMessageOrderLabel => Get();
+    public string ReverseMessageOrderTooltip => Get();
     public string FormatMarkdownLabel => Get();
     public string FormatMarkdownTooltip => Get();
     public string DownloadAssetsLabel => Get();

DiscordChatExporter.Gui/Services/SettingsService.cs

@@ -61,6 +61,9 @@ public partial class SettingsService()
     [ObservableProperty]
     public partial string? LastMessageFilterValue { get; set; }
 
+    [ObservableProperty]
+    public partial bool LastIsReverseMessageOrder { get; set; }
+
     [ObservableProperty]
     public partial bool LastShouldFormatMarkdown { get; set; } = true;
 

DiscordChatExporter.Gui/ViewModels/Components/DashboardViewModel.cs

@@ -275,6 +275,7 @@ public partial class DashboardViewModel : ViewModelBase
                             dialog.Before?.Pipe(Snowflake.FromDate),
                             dialog.PartitionLimit,
                             dialog.MessageFilter,
+                            dialog.IsReverseMessageOrder,
                             dialog.ShouldFormatMarkdown,
                             dialog.ShouldDownloadAssets,
                             dialog.ShouldReuseAssets,

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -62,6 +62,9 @@ public partial class ExportSetupViewModel(
     [NotifyPropertyChangedFor(nameof(MessageFilter))]
     public partial string? MessageFilterValue { get; set; }
 
+    [ObservableProperty]
+    public partial bool IsReverseMessageOrder { get; set; }
+
     [ObservableProperty]
     public partial bool ShouldFormatMarkdown { get; set; }
 
@@ -106,6 +109,7 @@ public partial class ExportSetupViewModel(
         SelectedFormat = settingsService.LastExportFormat;
         PartitionLimitValue = settingsService.LastPartitionLimitValue;
         MessageFilterValue = settingsService.LastMessageFilterValue;
+        IsReverseMessageOrder = settingsService.LastIsReverseMessageOrder;
         ShouldFormatMarkdown = settingsService.LastShouldFormatMarkdown;
         ShouldDownloadAssets = settingsService.LastShouldDownloadAssets;
         ShouldReuseAssets = settingsService.LastShouldReuseAssets;
@@ -120,7 +124,8 @@ public partial class ExportSetupViewModel(
             || !string.IsNullOrWhiteSpace(MessageFilterValue)
             || ShouldDownloadAssets
             || ShouldReuseAssets
-            || !string.IsNullOrWhiteSpace(AssetsDirPath);
+            || !string.IsNullOrWhiteSpace(AssetsDirPath)
+            || IsReverseMessageOrder;
     }
 
     [RelayCommand]
@@ -184,6 +189,7 @@ public partial class ExportSetupViewModel(
         settingsService.LastExportFormat = SelectedFormat;
         settingsService.LastPartitionLimitValue = PartitionLimitValue;
         settingsService.LastMessageFilterValue = MessageFilterValue;
+        settingsService.LastIsReverseMessageOrder = IsReverseMessageOrder;
         settingsService.LastShouldFormatMarkdown = ShouldFormatMarkdown;
         settingsService.LastShouldDownloadAssets = ShouldDownloadAssets;
         settingsService.LastShouldReuseAssets = ShouldReuseAssets;

DiscordChatExporter.Gui/Views/Dialogs/ExportSetupView.axaml

@@ -196,6 +196,15 @@
                             Theme="{DynamicResource FilledTextBox}"
                             ToolTip.Tip="{Binding LocalizationManager.MessageFilterTooltip}" />
 
+                        <!--  Reverse message order  -->
+                        <DockPanel
+                            Margin="16,8"
+                            LastChildFill="False"
+                            ToolTip.Tip="{Binding LocalizationManager.ReverseMessageOrderTooltip}">
+                            <TextBlock DockPanel.Dock="Left" Text="{Binding LocalizationManager.ReverseMessageOrderLabel}" />
+                            <ToggleSwitch DockPanel.Dock="Right" IsChecked="{Binding IsReverseMessageOrder}" />
+                        </DockPanel>
+
                         <!--  Markdown formatting  -->
                         <DockPanel
                             Margin="16,8"