Update version

Closes #372

.github/workflows/CD.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.3
 
     - name: Install .NET Core
-      uses: actions/setup-dotnet@v1.4.0
+      uses: actions/setup-dotnet@v1.7.2
       with:
         dotnet-version: 3.1.100
 

.github/workflows/CI.yml

@@ -8,10 +8,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.3
 
     - name: Install .NET Core
-      uses: actions/setup-dotnet@v1.4.0
+      uses: actions/setup-dotnet@v1.7.2
       with:
         dotnet-version: 3.1.100
 

Changelog.md

@@ -1,3 +1,26 @@
+### v2.24 (24-Oct-2020)
+
+- [CLI] Updated to [CliFx v1.5](https://github.com/Tyrrrz/CliFx), which brings some UX improvements.
+- [GUI] Added dark mode, which can be enabled in settings. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- [GUI] Improved the UX in a few minor places.
+- [JSON] Added `embed.color` property to the output. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added additional date formats: `unix` to write dates as a unix timestamp and `unixms` for the milliseconds version. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added retry policy for downloading media content. This is mostly a workaround for transient failures that sometimes may occur when downloading assets referenced from embeds. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added an option to reuse already downloaded media to avoid redundant network requests. It can be enabled in settings in GUI, or by passing `--reuse-media` in CLI. To facilitate this feature, the file name strategy has been changed as well -- now instead of relying on the original file name and adding `(n)` to the end in case of duplicates, a URL hash is injected in every file name. This also means that when the "reuse media" option is disabled, existing files inside the media directory may be overwritten. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+
+### v2.23 (14-Sep-2020)
+
+- [CLI] Added a command to export all channels across all servers. Use `exportall` to do it. (Thanks [@wyattscarpenter](https://github.com/wyattscarpenter))
+- [HTML] Fixed an issue where Whitney fonts were not being loaded properly, causing the browser to fall back to Helvetica.
+- Fixed an issue where self-contained export crashed occasionally. This usually happened when the server hosting the file did not serve the stream properly. Such files are now ignored after the first failed attempt.
+
+### v2.22 (12-Aug-2020)
+
+- [GUI] Improved the channel list by adding collapsible category groups. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [GUI] Improved exporting options by adding a set of controls that can be used to limit the date range of the export down to minutes. Previously it was only possible to configure the date range without the time component. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [HTML] Fixed an issue where the export didn't reflect changes in nicknames between messages sent by bots. This affected chat logs that contained interactions with the Tupperbox bot. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [CLI] Fixed an issue where the application crashed if there were two environment variables defined that had the same name but in different case.
+
 ### v2.21.2 (30-Jul-2020)
 
 - [GUI] When copy-pasting token, any surrounding spaces are now discarded, in addition to double quotes.

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -11,25 +11,36 @@ namespace DiscordChatExporter.Cli.Commands.Base
 {
     public abstract class ExportCommandBase : TokenCommandBase
     {
-        [CommandOption("output", 'o', Description = "Output file or directory path.")]
+        [CommandOption("output", 'o',
+            Description = "Output file or directory path.")]
         public string OutputPath { get; set; } = Directory.GetCurrentDirectory();
 
-        [CommandOption("format", 'f', Description = "Output file format.")]
+        [CommandOption("format", 'f',
+            Description = "Export format.")]
         public ExportFormat ExportFormat { get; set; } = ExportFormat.HtmlDark;
 
-        [CommandOption("after", Description = "Limit to messages sent after this date.")]
+        [CommandOption("after",
+            Description = "Only include messages sent after this date.")]
         public DateTimeOffset? After { get; set; }
 
-        [CommandOption("before", Description = "Limit to messages sent before this date.")]
+        [CommandOption("before",
+            Description = "Only include messages sent before this date.")]
         public DateTimeOffset? Before { get; set; }
 
-        [CommandOption("partition", 'p', Description = "Split output into partitions limited to this number of messages.")]
+        [CommandOption("partition", 'p',
+            Description = "Split output into partitions limited to this number of messages.")]
         public int? PartitionLimit { get; set; }
 
-        [CommandOption("media", Description = "Download referenced media content.")]
+        [CommandOption("media",
+            Description = "Download referenced media content.")]
         public bool ShouldDownloadMedia { get; set; }
 
-        [CommandOption("dateformat", Description = "Date format used in output.")]
+        [CommandOption("reuse-media",
+            Description = "Reuse already existing media content to skip redundant downloads.")]
+        public bool ShouldReuseMedia { get; set; }
+
+        [CommandOption("dateformat",
+            Description = "Format used when writing dates.")]
         public string DateFormat { get; set; } = "dd-MMM-yy hh:mm tt";
 
         protected ChannelExporter GetChannelExporter() => new ChannelExporter(GetDiscordClient());
@@ -48,6 +59,7 @@ namespace DiscordChatExporter.Cli.Commands.Base
                 Before,
                 PartitionLimit,
                 ShouldDownloadMedia,
+                ShouldReuseMedia,
                 DateFormat
             );
 

DiscordChatExporter.Cli/Commands/Base/ExportMultipleCommandBase.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -16,21 +17,23 @@ namespace DiscordChatExporter.Cli.Commands.Base
 {
     public abstract class ExportMultipleCommandBase : ExportCommandBase
     {
-        [CommandOption("parallel", Description = "Export this number of channels in parallel.")]
+        [CommandOption("parallel",
+            Description = "Limits how many channels can be exported in parallel.")]
         public int ParallelLimit { get; set; } = 1;
 
         protected async ValueTask ExportMultipleAsync(IConsole console, IReadOnlyList<Channel> channels)
         {
-            // HACK: this uses a separate route from ExportCommandBase because the progress ticker is not thread-safe
+            // This uses a different route from ExportCommandBase.ExportAsync() because it runs
+            // in parallel and needs another way to report progress to console.
 
             console.Output.Write($"Exporting {channels.Count} channels... ");
             var progress = console.CreateProgressTicker();
 
             var operations = progress.Wrap().CreateOperations(channels.Count);
 
-            var errors = new List<string>();
-
             var successfulExportCount = 0;
+            var errors = new ConcurrentBag<string>();
+
             await channels.Zip(operations).ParallelForEachAsync(async tuple =>
             {
                 var (channel, operation) = tuple;
@@ -48,6 +51,7 @@ namespace DiscordChatExporter.Cli.Commands.Base
                         Before,
                         PartitionLimit,
                         ShouldDownloadMedia,
+                        ShouldReuseMedia,
                         DateFormat
                     );
 

DiscordChatExporter.Cli/Commands/Base/TokenCommandBase.cs

@@ -7,15 +7,22 @@ namespace DiscordChatExporter.Cli.Commands.Base
 {
     public abstract class TokenCommandBase : ICommand
     {
-        [CommandOption("token", 't', IsRequired = true, EnvironmentVariableName = "DISCORD_TOKEN",
+        [CommandOption("token", 't', IsRequired = true,
+            EnvironmentVariableName = "DISCORD_TOKEN",
             Description = "Authorization token.")]
         public string TokenValue { get; set; } = "";
 
-        [CommandOption("bot", 'b', EnvironmentVariableName = "DISCORD_TOKEN_BOT",
-            Description = "Whether this authorization token belongs to a bot.")]
+        [CommandOption("bot", 'b',
+            EnvironmentVariableName = "DISCORD_TOKEN_BOT",
+            Description = "Authorize as a bot.")]
         public bool IsBotToken { get; set; }
 
-        protected AuthToken GetAuthToken() => new AuthToken(IsBotToken ? AuthTokenType.Bot : AuthTokenType.User, TokenValue);
+        protected AuthToken GetAuthToken() => new AuthToken(
+            IsBotToken
+                ? AuthTokenType.Bot
+                : AuthTokenType.User,
+            TokenValue
+        );
 
         protected DiscordClient GetDiscordClient() => new DiscordClient(GetAuthToken());
 

DiscordChatExporter.Cli/Commands/ExportAllCommand.cs

@@ -0,0 +1,37 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using CliFx;
+using CliFx.Attributes;
+using DiscordChatExporter.Cli.Commands.Base;
+using DiscordChatExporter.Domain.Discord.Models;
+
+namespace DiscordChatExporter.Cli.Commands
+{
+    [Command("exportall", Description = "Export all accessible channels.")]
+    public class ExportAllCommand : ExportMultipleCommandBase
+    {
+        [CommandOption("include-dm",
+            Description = "Include direct message channels.")]
+        public bool IncludeDirectMessages { get; set; } = true;
+
+        public override async ValueTask ExecuteAsync(IConsole console)
+        {
+            var channels = new List<Channel>();
+
+            // Aggregate channels from all guilds
+            await foreach (var guild in GetDiscordClient().GetUserGuildsAsync())
+            {
+                // Skip DMs if instructed to
+                if (!IncludeDirectMessages && guild.Id == Guild.DirectMessages.Id)
+                    continue;
+
+                await foreach (var channel in GetDiscordClient().GetGuildChannelsAsync(guild.Id))
+                {
+                    channels.Add(channel);
+                }
+            }
+
+            await ExportMultipleAsync(console, channels);
+        }
+    }
+}

DiscordChatExporter.Cli/Commands/ExportChannelCommand.cs

@@ -8,9 +8,11 @@ namespace DiscordChatExporter.Cli.Commands
     [Command("export", Description = "Export a channel.")]
     public class ExportChannelCommand : ExportCommandBase
     {
-        [CommandOption("channel", 'c', IsRequired = true, Description = "Channel ID.")]
+        [CommandOption("channel", 'c', IsRequired = true,
+            Description = "Channel ID.")]
         public string ChannelId { get; set; } = "";
 
-        public override async ValueTask ExecuteAsync(IConsole console) => await ExportAsync(console, ChannelId);
+        public override async ValueTask ExecuteAsync(IConsole console) =>
+            await ExportAsync(console, ChannelId);
     }
 }

DiscordChatExporter.Cli/Commands/ExportDirectMessagesCommand.cs

@@ -12,8 +12,8 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var dmChannels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
-            await ExportMultipleAsync(console, dmChannels);
+            var channels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
+            await ExportMultipleAsync(console, channels);
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportGuildCommand.cs

@@ -9,13 +9,14 @@ namespace DiscordChatExporter.Cli.Commands
     [Command("exportguild", Description = "Export all channels within specified guild.")]
     public class ExportGuildCommand : ExportMultipleCommandBase
     {
-        [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
+        [CommandOption("guild", 'g', IsRequired = true,
+            Description = "Guild ID.")]
         public string GuildId { get; set; } = "";
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var guildChannels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
-            await ExportMultipleAsync(console, guildChannels);
+            var channels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
+            await ExportMultipleAsync(console, channels);
         }
     }
 }

DiscordChatExporter.Cli/Commands/GetChannelsCommand.cs

@@ -7,17 +7,18 @@ using DiscordChatExporter.Domain.Utilities;
 
 namespace DiscordChatExporter.Cli.Commands
 {
-    [Command("channels", Description = "Get the list of channels in specified guild.")]
+    [Command("channels", Description = "Get the list of channels in a guild.")]
     public class GetChannelsCommand : TokenCommandBase
     {
-        [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
+        [CommandOption("guild", 'g', IsRequired = true,
+            Description = "Guild ID.")]
         public string GuildId { get; set; } = "";
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var guildChannels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
+            var channels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
 
-            foreach (var channel in guildChannels.OrderBy(c => c.Category).ThenBy(c => c.Name))
+            foreach (var channel in channels.OrderBy(c => c.Category).ThenBy(c => c.Name))
                 console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
         }
     }

DiscordChatExporter.Cli/Commands/GetDirectMessageChannelsCommand.cs

@@ -13,9 +13,9 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var dmChannels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
+            var channels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
 
-            foreach (var channel in dmChannels.OrderBy(c => c.Category).ThenBy(c => c.Name))
+            foreach (var channel in channels.OrderBy(c => c.Category).ThenBy(c => c.Name))
                 console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
         }
     }

DiscordChatExporter.Cli/Commands/GuideCommand.cs

@@ -10,7 +10,9 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public ValueTask ExecuteAsync(IConsole console)
         {
-            console.WithForegroundColor(ConsoleColor.White, () => console.Output.WriteLine("To get user token:"));
+            console.WithForegroundColor(ConsoleColor.White, () =>
+                console.Output.WriteLine("To get user token:")
+            );
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Press Ctrl+Shift+I to show developer tools");
             console.Output.WriteLine(" 3. Navigate to the Application tab");
@@ -20,14 +22,18 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" *  Automating user accounts is technically against TOS, use at your own risk.");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () => console.Output.WriteLine("To get bot token:"));
+            console.WithForegroundColor(ConsoleColor.White, () =>
+                console.Output.WriteLine("To get bot token:")
+            );
             console.Output.WriteLine(" 1. Go to Discord developer portal");
             console.Output.WriteLine(" 2. Open your application's settings");
             console.Output.WriteLine(" 3. Navigate to the Bot section on the left");
             console.Output.WriteLine(" 4. Under Token click Copy");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () => console.Output.WriteLine("To get guild ID or guild channel ID:"));
+            console.WithForegroundColor(ConsoleColor.White, () =>
+                console.Output.WriteLine("To get guild ID or guild channel ID:")
+            );
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Open Settings");
             console.Output.WriteLine(" 3. Go to Appearance section");
@@ -35,7 +41,9 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" 5. Right click on the desired guild or channel and click Copy ID");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () => console.Output.WriteLine("To get direct message channel ID:"));
+            console.WithForegroundColor(ConsoleColor.White, () =>
+                console.Output.WriteLine("To get direct message channel ID:")
+            );
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Open the desired direct message channel");
             console.Output.WriteLine(" 3. Press Ctrl+Shift+I to show developer tools");
@@ -44,8 +52,12 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" 6. Copy the first long sequence of numbers inside the URL");
             console.Output.WriteLine();
 
-            console.Output.WriteLine("For more information, check out the wiki:");
-            console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki");
+            console.WithForegroundColor(ConsoleColor.White,
+                () => console.Output.WriteLine("For more information, check out the wiki:")
+            );
+            console.WithForegroundColor(ConsoleColor.Blue,
+                () => console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki")
+            );
 
             return default;
         }

DiscordChatExporter.Cli/DiscordChatExporter.Cli.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CliFx" Version="1.3.1" />
+    <PackageReference Include="CliFx" Version="1.5.0" />
     <PackageReference Include="Gress" Version="1.2.0" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>

DiscordChatExporter.Domain/Discord/DiscordClient.cs

@@ -9,50 +9,33 @@ using DiscordChatExporter.Domain.Discord.Models;
 using DiscordChatExporter.Domain.Exceptions;
 using DiscordChatExporter.Domain.Internal;
 using DiscordChatExporter.Domain.Internal.Extensions;
-using Polly;
 
 namespace DiscordChatExporter.Domain.Discord
 {
     public class DiscordClient
     {
+        private readonly HttpClient _httpClient;
         private readonly AuthToken _token;
-        private readonly HttpClient _httpClient = Singleton.HttpClient;
-        private readonly IAsyncPolicy<HttpResponseMessage> _httpRequestPolicy;
 
         private readonly Uri _baseUri = new Uri("https://discord.com/api/v6/", UriKind.Absolute);
 
-        public DiscordClient(AuthToken token)
+        public DiscordClient(HttpClient httpClient, AuthToken token)
         {
+            _httpClient = httpClient;
             _token = token;
-
-            // Discord seems to always respond with 429 on the first request with unreasonable wait time (10+ minutes).
-            // For that reason the policy will ignore such errors at first, then wait a constant amount of time, and
-            // finally wait the specified amount of time, based on how many requests have failed in a row.
-            _httpRequestPolicy = Policy
-                .HandleResult<HttpResponseMessage>(m => m.StatusCode == HttpStatusCode.TooManyRequests)
-                .OrResult(m => m.StatusCode >= HttpStatusCode.InternalServerError)
-                .WaitAndRetryAsync(6,
-                    (i, result, ctx) =>
-                    {
-                        if (i <= 3)
-                            return TimeSpan.FromSeconds(2 * i);
-
-                        if (i <= 5)
-                            return TimeSpan.FromSeconds(5 * i);
-
-                        return result.Result.Headers.RetryAfter.Delta ?? TimeSpan.FromSeconds(10 * i);
-                    },
-                    (response, timespan, retryCount, context) => Task.CompletedTask
-                );
         }
 
-        private async ValueTask<HttpResponseMessage> GetResponseAsync(string url) => await _httpRequestPolicy.ExecuteAsync(async () =>
-        {
-            using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(_baseUri, url));
-            request.Headers.Authorization = _token.GetAuthorizationHeader();
+        public DiscordClient(AuthToken token)
+            : this(Http.Client, token) {}
 
-            return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
-        });
+        private async ValueTask<HttpResponseMessage> GetResponseAsync(string url) =>
+            await Http.ResponsePolicy.ExecuteAsync(async () =>
+            {
+                using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(_baseUri, url));
+                request.Headers.Authorization = _token.GetAuthorizationHeader();
+
+                return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
+            });
 
         private async ValueTask<JsonElement> GetJsonResponseAsync(string url)
         {

DiscordChatExporter.Domain/Discord/Models/Message.cs

@@ -33,6 +33,8 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public DateTimeOffset? EditedTimestamp { get; }
 
+        public DateTimeOffset? CallEndedTimestamp { get; }
+
         public bool IsPinned { get; }
 
         public string Content { get; }
@@ -51,6 +53,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
             User author,
             DateTimeOffset timestamp,
             DateTimeOffset? editedTimestamp,
+            DateTimeOffset? callEndedTimestamp,
             bool isPinned,
             string content,
             IReadOnlyList<Attachment> attachments,
@@ -63,6 +66,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
             Author = author;
             Timestamp = timestamp;
             EditedTimestamp = editedTimestamp;
+            CallEndedTimestamp = callEndedTimestamp;
             IsPinned = isPinned;
             Content = content;
             Attachments = attachments;
@@ -82,6 +86,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
             var author = json.GetProperty("author").Pipe(User.Parse);
             var timestamp = json.GetProperty("timestamp").GetDateTimeOffset();
             var editedTimestamp = json.GetPropertyOrNull("edited_timestamp")?.GetDateTimeOffset();
+            var callEndedTimestamp = json.GetPropertyOrNull("call")?.GetPropertyOrNull("ended_timestamp")?.GetDateTimeOffset();
             var type = (MessageType) json.GetProperty("type").GetInt32();
             var isPinned = json.GetPropertyOrNull("pinned")?.GetBoolean() ?? false;
 
@@ -89,7 +94,8 @@ namespace DiscordChatExporter.Domain.Discord.Models
             {
                 MessageType.RecipientAdd => "Added a recipient.",
                 MessageType.RecipientRemove => "Removed a recipient.",
-                MessageType.Call => "Started a call.",
+                MessageType.Call =>
+                $"Started a call that lasted {callEndedTimestamp?.Pipe(t => t - timestamp).Pipe(t => (int) t.TotalMinutes) ?? 0} minutes.",
                 MessageType.ChannelNameChange => "Changed the channel name.",
                 MessageType.ChannelIconChange => "Changed the channel icon.",
                 MessageType.ChannelPinnedMessage => "Pinned a message.",
@@ -119,6 +125,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
                 author,
                 timestamp,
                 editedTimestamp,
+                callEndedTimestamp,
                 isPinned,
                 content,
                 attachments,

DiscordChatExporter.Domain/DiscordChatExporter.Domain.csproj

@@ -2,7 +2,7 @@
   <Import Project="../DiscordChatExporter.props" />
 
   <ItemGroup>
-    <PackageReference Include="MiniRazor" Version="1.0.1" />
+    <PackageReference Include="MiniRazor" Version="1.1.0" />
     <PackageReference Include="Polly" Version="7.2.1" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>

DiscordChatExporter.Domain/Exporting/ExportContext.cs

@@ -34,10 +34,15 @@ namespace DiscordChatExporter.Domain.Exporting
             Channels = channels;
             Roles = roles;
 
-            _mediaDownloader = new MediaDownloader(request.OutputMediaDirPath);
+            _mediaDownloader = new MediaDownloader(request.OutputMediaDirPath, request.ShouldReuseMedia);
         }
 
-        public string FormatDate(DateTimeOffset date) => date.ToLocalString(Request.DateFormat);
+        public string FormatDate(DateTimeOffset date) => Request.DateFormat switch
+        {
+            "unix" => date.ToUnixTimeSeconds().ToString(),
+            "unixms" => date.ToUnixTimeMilliseconds().ToString(),
+            var dateFormat => date.ToLocalString(dateFormat)
+        };
 
         public Member? TryGetMember(string id) =>
             Members.FirstOrDefault(m => m.Id == id);
@@ -72,7 +77,7 @@ namespace DiscordChatExporter.Domain.Exporting
                 // We want relative path so that the output files can be copied around without breaking
                 var relativeFilePath = Path.GetRelativePath(Request.OutputBaseDirPath, filePath);
 
-                // For HTML, we need to format the URL properly
+                // HACK: for HTML, we need to format the URL properly
                 if (Request.Format == ExportFormat.HtmlDark || Request.Format == ExportFormat.HtmlLight)
                 {
                     // Need to escape each path segment while keeping the directory separators intact
@@ -84,8 +89,12 @@ namespace DiscordChatExporter.Domain.Exporting
 
                 return relativeFilePath;
             }
-            catch (HttpRequestException)
+            // Try to catch only exceptions related to failed HTTP requests
+            // https://github.com/Tyrrrz/DiscordChatExporter/issues/332
+            // https://github.com/Tyrrrz/DiscordChatExporter/issues/372
+            catch (Exception ex) when (ex is HttpRequestException || ex is OperationCanceledException)
             {
+                // TODO: add logging so we can be more liberal with catching exceptions
                 // We don't want this to crash the exporting process in case of failure
                 return url;
             }

DiscordChatExporter.Domain/Exporting/ExportRequest.cs

@@ -30,6 +30,8 @@ namespace DiscordChatExporter.Domain.Exporting
 
         public bool ShouldDownloadMedia { get; }
 
+        public bool ShouldReuseMedia { get; }
+
         public string DateFormat { get; }
 
         public ExportRequest(
@@ -41,6 +43,7 @@ namespace DiscordChatExporter.Domain.Exporting
             DateTimeOffset? before,
             int? partitionLimit,
             bool shouldDownloadMedia,
+            bool shouldReuseMedia,
             string dateFormat)
         {
             Guild = guild;
@@ -51,6 +54,7 @@ namespace DiscordChatExporter.Domain.Exporting
             Before = before;
             PartitionLimit = partitionLimit;
             ShouldDownloadMedia = shouldDownloadMedia;
+            ShouldReuseMedia = shouldReuseMedia;
             DateFormat = dateFormat;
 
             OutputBaseFilePath = GetOutputBaseFilePath(

DiscordChatExporter.Domain/Exporting/MediaDownloader.cs

@@ -2,6 +2,8 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using DiscordChatExporter.Domain.Internal;
@@ -11,45 +13,74 @@ namespace DiscordChatExporter.Domain.Exporting
 {
     internal partial class MediaDownloader
     {
-        private readonly HttpClient _httpClient = Singleton.HttpClient;
+        private readonly HttpClient _httpClient;
         private readonly string _workingDirPath;
+        private readonly bool _reuseMedia;
 
-        private readonly Dictionary<string, string> _pathMap = new Dictionary<string, string>();
+        // URL -> Local file path
+        private readonly Dictionary<string, string> _pathCache =
+            new Dictionary<string, string>(StringComparer.Ordinal);
 
-        public MediaDownloader(string workingDirPath)
+        public MediaDownloader(HttpClient httpClient, string workingDirPath, bool reuseMedia)
         {
+            _httpClient = httpClient;
             _workingDirPath = workingDirPath;
+            _reuseMedia = reuseMedia;
         }
 
+        public MediaDownloader(string workingDirPath, bool reuseMedia)
+            : this(Http.Client, workingDirPath, reuseMedia) {}
+
         public async ValueTask<string> DownloadAsync(string url)
         {
-            if (_pathMap.TryGetValue(url, out var cachedFilePath))
+            if (_pathCache.TryGetValue(url, out var cachedFilePath))
                 return cachedFilePath;
 
             var fileName = GetFileNameFromUrl(url);
-            var filePath = PathEx.MakeUniqueFilePath(Path.Combine(_workingDirPath, fileName));
+            var filePath = Path.Combine(_workingDirPath, fileName);
 
+            // Reuse existing files if we're allowed to
+            if (_reuseMedia && File.Exists(filePath))
+                return _pathCache[url] = filePath;
+
+            // Download it
             Directory.CreateDirectory(_workingDirPath);
+            await Http.ExceptionPolicy.ExecuteAsync(async () =>
+            {
+                // This catches IOExceptions which is dangerous as we're working also with files
+                await _httpClient.DownloadAsync(url, filePath);
+            });
 
-            await _httpClient.DownloadAsync(url, filePath);
-
-            return _pathMap[url] = filePath;
+            return _pathCache[url] = filePath;
         }
     }
 
     internal partial class MediaDownloader
     {
-        private static string GetRandomFileName() => Guid.NewGuid().ToString().Replace("-", "").Substring(0, 16);
+        private static string GetUrlHash(string url)
+        {
+            using var hash = SHA256.Create();
+
+            var data = hash.ComputeHash(Encoding.UTF8.GetBytes(url));
+            return data.ToHex().Truncate(5); // 5 chars ought to be enough for anybody
+        }
 
         private static string GetFileNameFromUrl(string url)
         {
-            var originalFileName = Regex.Match(url, @".+/([^?]*)").Groups[1].Value;
+            var urlHash = GetUrlHash(url);
 
-            var fileName = !string.IsNullOrWhiteSpace(originalFileName)
-                ? $"{Path.GetFileNameWithoutExtension(originalFileName).Truncate(50)}{Path.GetExtension(originalFileName)}"
-                : GetRandomFileName();
+            // Try to extract file name from URL
+            var fileName = Regex.Match(url, @".+/([^?]*)").Groups[1].Value;
 
-            return PathEx.EscapePath(fileName);
+            // If it's not there, just use the URL hash as the file name
+            if (string.IsNullOrWhiteSpace(fileName))
+                return urlHash;
+
+            // Otherwise, use the original file name but inject the hash in the middle
+            var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
+            var fileExtension = Path.GetExtension(fileName);
+
+            return PathEx.EscapePath(fileNameWithoutExtension.Truncate(42) + '-' + urlHash + fileExtension);
         }
     }
-}
+}

DiscordChatExporter.Domain/Exporting/MessageExporter.cs

@@ -72,7 +72,9 @@ namespace DiscordChatExporter.Domain.Exporting
 
     internal partial class MessageExporter
     {
-        private static string GetPartitionFilePath(string baseFilePath, int partitionIndex)
+        private static string GetPartitionFilePath(
+            string baseFilePath,
+            int partitionIndex)
         {
             // First partition - don't change file name
             if (partitionIndex <= 0)
@@ -82,16 +84,17 @@ namespace DiscordChatExporter.Domain.Exporting
             var fileNameWithoutExt = Path.GetFileNameWithoutExtension(baseFilePath);
             var fileExt = Path.GetExtension(baseFilePath);
             var fileName = $"{fileNameWithoutExt} [part {partitionIndex + 1}]{fileExt}";
-
-            // Generate new path
             var dirPath = Path.GetDirectoryName(baseFilePath);
-            if (!string.IsNullOrWhiteSpace(dirPath))
-                return Path.Combine(dirPath, fileName);
 
-            return fileName;
+            return !string.IsNullOrWhiteSpace(dirPath)
+                ? Path.Combine(dirPath, fileName)
+                : fileName;
         }
 
-        private static MessageWriter CreateMessageWriter(string filePath, ExportFormat format, ExportContext context)
+        private static MessageWriter CreateMessageWriter(
+            string filePath,
+            ExportFormat format,
+            ExportContext context)
         {
             // Stream will be disposed by the underlying writer
             var stream = File.Create(filePath);

DiscordChatExporter.Domain/Exporting/Writers/Html/Core.css

@@ -2,31 +2,31 @@
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/6c6374bad0b0b6d204d8d6dc4a18d820.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-300.woff);
     font-weight: 300;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/e8acd7d9bf6207f99350ca9f9e23b168.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-400.woff);
     font-weight: 400;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/3bdef1251a424500c1b3a78dea9b7e57.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-500.woff);
     font-weight: 500;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/be0060dafb7a0e31d2a1ca17c0708636.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-600.woff);
     font-weight: 600;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/8e12fb4f14d9c4592eb8ec9f22337b04.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-700.woff);
     font-weight: 700;
 }
 

DiscordChatExporter.Domain/Exporting/Writers/Html/MessageGroupTemplate.cshtml

@@ -14,7 +14,7 @@
 
     var userMember = Model.ExportContext.TryGetMember(Model.MessageGroup.Author.Id);
     var userColor = Model.ExportContext.TryGetUserColor(Model.MessageGroup.Author.Id);
-    var userNick = userMember?.Nick ?? Model.MessageGroup.Author.Name;
+    var userNick = (Model.MessageGroup.Author.IsBot ? Model.MessageGroup.Author.Name : (userMember?.Nick ?? Model.MessageGroup.Author.Name));
 
     var userColorStyle = userColor != null
         ? $"color: rgb({userColor?.R},{userColor?.G},{userColor?.B})"

DiscordChatExporter.Domain/Exporting/Writers/Html/TemplateBundle.cs

@@ -3,12 +3,18 @@ using System.Threading.Tasks;
 using MiniRazor;
 using Tyrrrz.Extensions;
 
-[assembly: InternalsVisibleTo("RazorAssembly")]
+[assembly: InternalsVisibleTo(DiscordChatExporter.Domain.Exporting.Writers.Html.TemplateBundle.PreambleTemplateAssemblyName)]
+[assembly: InternalsVisibleTo(DiscordChatExporter.Domain.Exporting.Writers.Html.TemplateBundle.MessageGroupTemplateAssemblyName)]
+[assembly: InternalsVisibleTo(DiscordChatExporter.Domain.Exporting.Writers.Html.TemplateBundle.PostambleTemplateAssemblyName)]
 
 namespace DiscordChatExporter.Domain.Exporting.Writers.Html
 {
     internal partial class TemplateBundle
     {
+        public const string PreambleTemplateAssemblyName = "RazorAssembly_Preamble";
+        public const string MessageGroupTemplateAssemblyName = "RazorAssembly_MessageGroup";
+        public const string PostambleTemplateAssemblyName = "RazorAssembly_Postamble";
+
         public MiniRazorTemplateDescriptor PreambleTemplate { get; }
 
         public MiniRazorTemplateDescriptor MessageGroupTemplate { get; }
@@ -44,11 +50,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.Html
             var postambleTemplateSource = typeof(HtmlMessageWriter).Assembly
                 .GetManifestResourceString($"{ns}.PostambleTemplate.cshtml");
 
-            var engine = new MiniRazorTemplateEngine("RazorAssembly", ns);
+            var engine = new MiniRazorTemplateEngine();
 
-            var preambleTemplate = engine.Compile(preambleTemplateSource);
-            var messageGroupTemplate = engine.Compile(messageGroupTemplateSource);
-            var postambleTemplate = engine.Compile(postambleTemplateSource);
+            var preambleTemplate = engine.Compile(preambleTemplateSource, PreambleTemplateAssemblyName, ns);
+            var messageGroupTemplate = engine.Compile(messageGroupTemplateSource, MessageGroupTemplateAssemblyName, ns);
+            var postambleTemplate = engine.Compile(postambleTemplateSource, PostambleTemplateAssemblyName, ns);
 
             return new TemplateBundle(preambleTemplate, messageGroupTemplate, postambleTemplate);
         });

DiscordChatExporter.Domain/Exporting/Writers/JsonMessageWriter.cs

@@ -114,6 +114,9 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteString("timestamp", embed.Timestamp);
             _writer.WriteString("description", FormatMarkdown(embed.Description));
 
+            if (embed.Color != null)
+                _writer.WriteString("color", embed.Color.Value.ToHex());
+
             if (embed.Author != null)
                 await WriteEmbedAuthorAsync(embed.Author);
 
@@ -197,6 +200,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteString("type", message.Type.ToString());
             _writer.WriteString("timestamp", message.Timestamp);
             _writer.WriteString("timestampEdited", message.EditedTimestamp);
+            _writer.WriteString("callEndedTimestamp", message.CallEndedTimestamp);
             _writer.WriteBoolean("isPinned", message.IsPinned);
 
             // Content

DiscordChatExporter.Domain/Internal/Extensions/BinaryExtensions.cs

@@ -0,0 +1,19 @@
+using System.Text;
+
+namespace DiscordChatExporter.Domain.Internal.Extensions
+{
+    internal static class BinaryExtensions
+    {
+        public static string ToHex(this byte[] data)
+        {
+            var buffer = new StringBuilder();
+
+            foreach (var t in data)
+            {
+                buffer.Append(t.ToString("X2"));
+            }
+
+            return buffer.ToString();
+        }
+    }
+}

DiscordChatExporter.Domain/Internal/Extensions/ColorExtensions.cs

@@ -9,5 +9,7 @@ namespace DiscordChatExporter.Domain.Internal.Extensions
         public static Color ResetAlpha(this Color color) => color.WithAlpha(255);
 
         public static int ToRgb(this Color color) => color.ToArgb() & 0xffffff;
+
+        public static string ToHex(this Color color) => $"#{color.R:X2}{color.G:X2}{color.B:X2}";
     }
 }

DiscordChatExporter.Domain/Internal/Http.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Globalization;
+using System.IO;
+using System.Net;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using Polly;
+
+namespace DiscordChatExporter.Domain.Internal
+{
+    internal static class Http
+    {
+        public static HttpClient Client { get; } = new HttpClient();
+
+        public static IAsyncPolicy<HttpResponseMessage> ResponsePolicy { get; } =
+            Policy
+                .Handle<IOException>()
+                .Or<HttpRequestException>()
+                .OrResult<HttpResponseMessage>(m => m.StatusCode == HttpStatusCode.TooManyRequests)
+                .OrResult(m => m.StatusCode == HttpStatusCode.RequestTimeout)
+                .OrResult(m => m.StatusCode >= HttpStatusCode.InternalServerError)
+                .WaitAndRetryAsync(8,
+                    (i, result, ctx) =>
+                    {
+                        // If rate-limited, use retry-after as a guide
+                        if (result.Result.StatusCode == HttpStatusCode.TooManyRequests)
+                        {
+                            // Only start respecting retry-after after a few attempts.
+                            // The reason is that Discord often sends unreasonable (20+ minutes) retry-after
+                            // on the very first request.
+                            if (i > 3)
+                            {
+                                var retryAfterDelay = result.Result.Headers.RetryAfter.Delta;
+                                if (retryAfterDelay != null)
+                                    return retryAfterDelay.Value + TimeSpan.FromSeconds(1); // margin just in case
+                            }
+                        }
+
+                        return TimeSpan.FromSeconds(Math.Pow(2, i) + 1);
+                    },
+                    (response, timespan, retryCount, context) => Task.CompletedTask);
+
+        private static HttpStatusCode? TryGetStatusCodeFromException(HttpRequestException ex)
+        {
+            // This is extremely frail, but there's no other way
+            var statusCodeRaw = Regex.Match(ex.Message, @": (\d+) \(").Groups[1].Value;
+            return !string.IsNullOrWhiteSpace(statusCodeRaw)
+                ? (HttpStatusCode) int.Parse(statusCodeRaw, CultureInfo.InvariantCulture)
+                : (HttpStatusCode?) null;
+        }
+
+        public static IAsyncPolicy ExceptionPolicy { get; } =
+            Policy
+                .Handle<IOException>() // dangerous
+                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) == HttpStatusCode.TooManyRequests)
+                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) == HttpStatusCode.RequestTimeout)
+                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) >= HttpStatusCode.InternalServerError)
+                .WaitAndRetryAsync(4, i => TimeSpan.FromSeconds(Math.Pow(2, i) + 1));
+    }
+}

DiscordChatExporter.Domain/Internal/PathEx.cs

@@ -14,27 +14,5 @@ namespace DiscordChatExporter.Domain.Internal
         }
 
         public static string EscapePath(string path) => EscapePath(new StringBuilder(path)).ToString();
-
-        public static string MakeUniqueFilePath(string baseFilePath, int maxAttempts = int.MaxValue)
-        {
-            if (!File.Exists(baseFilePath))
-                return baseFilePath;
-
-            var baseDirPath = Path.GetDirectoryName(baseFilePath);
-            var baseFileNameWithoutExtension = Path.GetFileNameWithoutExtension(baseFilePath);
-            var baseFileExtension = Path.GetExtension(baseFilePath);
-
-            for (var i = 1; i <= maxAttempts; i++)
-            {
-                var filePath = $"{baseFileNameWithoutExtension} ({i}){baseFileExtension}";
-                if (!string.IsNullOrWhiteSpace(baseDirPath))
-                    filePath = Path.Combine(baseDirPath, filePath);
-
-                if (!File.Exists(filePath))
-                    return filePath;
-            }
-
-            return baseFilePath;
-        }
     }
 }

DiscordChatExporter.Domain/Internal/Singleton.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Net;
-using System.Net.Http;
-
-namespace DiscordChatExporter.Domain.Internal
-{
-    internal static class Singleton
-    {
-        private static readonly Lazy<HttpClient> LazyHttpClient = new Lazy<HttpClient>(() =>
-        {
-            var handler = new HttpClientHandler();
-
-            if (handler.SupportsAutomaticDecompression)
-                handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
-
-            handler.UseCookies = false;
-
-            return new HttpClient(handler, true);
-        });
-
-        public static HttpClient HttpClient { get; } = LazyHttpClient.Value;
-    }
-}

DiscordChatExporter.Domain/Utilities/AsyncExtensions.cs

@@ -9,7 +9,8 @@ namespace DiscordChatExporter.Domain.Utilities
 {
     public static class AsyncExtensions
     {
-        private static async ValueTask<IReadOnlyList<T>> AggregateAsync<T>(this IAsyncEnumerable<T> asyncEnumerable)
+        private static async ValueTask<IReadOnlyList<T>> AggregateAsync<T>(
+            this IAsyncEnumerable<T> asyncEnumerable)
         {
             var list = new List<T>();
 
@@ -19,10 +20,14 @@ namespace DiscordChatExporter.Domain.Utilities
             return list;
         }
 
-        public static ValueTaskAwaiter<IReadOnlyList<T>> GetAwaiter<T>(this IAsyncEnumerable<T> asyncEnumerable) =>
+        public static ValueTaskAwaiter<IReadOnlyList<T>> GetAwaiter<T>(
+            this IAsyncEnumerable<T> asyncEnumerable) =>
             asyncEnumerable.AggregateAsync().GetAwaiter();
 
-        public static async ValueTask ParallelForEachAsync<T>(this IEnumerable<T> source, Func<T, Task> handleAsync, int degreeOfParallelism)
+        public static async ValueTask ParallelForEachAsync<T>(
+            this IEnumerable<T> source,
+            Func<T, ValueTask> handleAsync,
+            int degreeOfParallelism)
         {
             using var semaphore = new SemaphoreSlim(degreeOfParallelism);
 

DiscordChatExporter.Gui/App.xaml

@@ -3,6 +3,7 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="clr-namespace:DiscordChatExporter.Gui"
+    xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
     xmlns:s="https://github.com/canton7/Stylet">
     <Application.Resources>
         <s:ApplicationLoader>
@@ -13,69 +14,15 @@
 
             <!--  Merged dictionaries  -->
             <ResourceDictionary.MergedDictionaries>
-                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
+                <!--  Colors are irrelevant because they are overriden in runtime  -->
+                <materialDesign:BundledTheme
+                    BaseTheme="Light"
+                    PrimaryColor="Blue"
+                    SecondaryColor="Blue" />
+
                 <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
             </ResourceDictionary.MergedDictionaries>
 
-            <!--  Colors  -->
-            <Color x:Key="PrimaryColor">#343838</Color>
-            <Color x:Key="PrimaryLightColor">#5E6262</Color>
-            <Color x:Key="PrimaryDarkColor">#0D1212</Color>
-            <Color x:Key="AccentColor">#F9A825</Color>
-            <Color x:Key="AccentDarkColor">#C17900</Color>
-            <Color x:Key="TextColor">#000000</Color>
-            <Color x:Key="InverseTextColor">#FFFFFF</Color>
-
-            <SolidColorBrush x:Key="PrimaryHueLightBrush" Color="{DynamicResource PrimaryLightColor}" />
-            <SolidColorBrush x:Key="PrimaryHueLightForegroundBrush" Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush x:Key="PrimaryHueMidBrush" Color="{DynamicResource PrimaryColor}" />
-            <SolidColorBrush x:Key="PrimaryHueMidForegroundBrush" Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush x:Key="PrimaryHueDarkBrush" Color="{DynamicResource PrimaryDarkColor}" />
-            <SolidColorBrush x:Key="PrimaryHueDarkForegroundBrush" Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush x:Key="SecondaryAccentBrush" Color="{DynamicResource AccentColor}" />
-            <SolidColorBrush x:Key="SecondaryAccentForegroundBrush" Color="{DynamicResource TextColor}" />
-
-            <SolidColorBrush
-                x:Key="PrimaryTextBrush"
-                Opacity="0.87"
-                Color="{DynamicResource TextColor}" />
-            <SolidColorBrush
-                x:Key="SecondaryTextBrush"
-                Opacity="0.64"
-                Color="{DynamicResource TextColor}" />
-            <SolidColorBrush
-                x:Key="DimTextBrush"
-                Opacity="0.45"
-                Color="{DynamicResource TextColor}" />
-            <SolidColorBrush
-                x:Key="PrimaryInverseTextBrush"
-                Opacity="1"
-                Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush
-                x:Key="SecondaryInverseTextBrush"
-                Opacity="0.7"
-                Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush
-                x:Key="DimInverseTextBrush"
-                Opacity="0.52"
-                Color="{DynamicResource InverseTextColor}" />
-            <SolidColorBrush
-                x:Key="AccentTextBrush"
-                Opacity="1"
-                Color="{DynamicResource AccentColor}" />
-            <SolidColorBrush
-                x:Key="AccentDarkTextBrush"
-                Opacity="1"
-                Color="{DynamicResource AccentDarkColor}" />
-            <SolidColorBrush
-                x:Key="DividerBrush"
-                Opacity="0.12"
-                Color="{DynamicResource TextColor}" />
-            <SolidColorBrush
-                x:Key="InverseDividerBrush"
-                Opacity="0.12"
-                Color="{DynamicResource InverseTextColor}" />
-
             <!--  Styles  -->
             <Style x:Key="MaterialDesignRoot" TargetType="{x:Type Control}">
                 <Setter Property="FontFamily" Value="{DynamicResource MaterialDesignFont}" />
@@ -83,7 +30,7 @@
                 <Setter Property="SnapsToDevicePixels" Value="True" />
                 <Setter Property="TextElement.FontSize" Value="13" />
                 <Setter Property="TextElement.FontWeight" Value="Regular" />
-                <Setter Property="TextElement.Foreground" Value="{DynamicResource SecondaryTextBrush}" />
+                <Setter Property="TextElement.Foreground" Value="{DynamicResource MaterialDesignBody}" />
                 <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" />
                 <Setter Property="TextOptions.TextRenderingMode" Value="Auto" />
                 <Setter Property="UseLayoutRounding" Value="True" />
@@ -93,23 +40,20 @@
 
             <Style BasedOn="{StaticResource MaterialDesignLinearProgressBar}" TargetType="{x:Type ProgressBar}">
                 <Setter Property="BorderThickness" Value="0" />
+                <Setter Property="Background" Value="Transparent" />
                 <Setter Property="Foreground" Value="{DynamicResource SecondaryAccentBrush}" />
                 <Setter Property="Height" Value="2" />
                 <Setter Property="Maximum" Value="1" />
                 <Setter Property="Minimum" Value="0" />
             </Style>
 
-            <Style BasedOn="{StaticResource MaterialDesignTextBox}" TargetType="{x:Type TextBox}">
-                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
-            </Style>
+            <Style BasedOn="{StaticResource MaterialDesignTextBox}" TargetType="{x:Type TextBox}" />
 
-            <Style BasedOn="{StaticResource MaterialDesignComboBox}" TargetType="{x:Type ComboBox}">
-                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
-            </Style>
+            <Style BasedOn="{StaticResource MaterialDesignComboBox}" TargetType="{x:Type ComboBox}" />
 
-            <Style BasedOn="{StaticResource MaterialDesignDatePicker}" TargetType="{x:Type DatePicker}">
-                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
-            </Style>
+            <Style BasedOn="{StaticResource MaterialDesignDatePicker}" TargetType="{x:Type DatePicker}" />
+
+            <Style BasedOn="{StaticResource MaterialDesignTimePicker}" TargetType="{x:Type materialDesign:TimePicker}" />
 
             <Style
                 x:Key="MaterialDesignFlatDarkButton"
@@ -136,6 +80,89 @@
                     </Trigger>
                 </Style.Triggers>
             </Style>
+
+            <!--  Default MD Expander is incredibly slow (https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/issues/1307)  -->
+            <Style BasedOn="{StaticResource MaterialDesignExpander}" TargetType="{x:Type Expander}">
+                <Setter Property="Template">
+                    <Setter.Value>
+                        <ControlTemplate TargetType="Expander">
+                            <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
+                                <DockPanel Background="{TemplateBinding Background}">
+                                    <ToggleButton
+                                        Name="HeaderSite"
+                                        BorderThickness="0"
+                                        Content="{TemplateBinding Header}"
+                                        ContentStringFormat="{TemplateBinding HeaderStringFormat}"
+                                        ContentTemplate="{TemplateBinding HeaderTemplate}"
+                                        ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}"
+                                        Cursor="Hand"
+                                        DockPanel.Dock="Top"
+                                        Focusable="False"
+                                        Foreground="{TemplateBinding Foreground}"
+                                        IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
+                                        IsTabStop="False"
+                                        Opacity=".87"
+                                        Style="{StaticResource MaterialDesignExpanderDownHeaderStyle}"
+                                        TextElement.FontSize="15" />
+                                    <Border
+                                        Name="ContentSite"
+                                        DockPanel.Dock="Bottom"
+                                        Visibility="Collapsed">
+                                        <StackPanel
+                                            Name="ContentPanel"
+                                            Margin="{TemplateBinding Padding}"
+                                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
+                                            <ContentPresenter
+                                                Name="PART_Content"
+                                                ContentStringFormat="{TemplateBinding ContentStringFormat}"
+                                                ContentTemplate="{TemplateBinding ContentTemplate}"
+                                                ContentTemplateSelector="{TemplateBinding ContentTemplateSelector}"
+                                                Focusable="False" />
+                                        </StackPanel>
+                                    </Border>
+                                </DockPanel>
+                            </Border>
+                            <ControlTemplate.Triggers>
+                                <Trigger Property="IsExpanded" Value="true">
+                                    <Setter TargetName="ContentSite" Property="Visibility" Value="Visible" />
+                                </Trigger>
+                                <Trigger Property="ExpandDirection" Value="Right">
+                                    <Setter TargetName="HeaderSite" Property="DockPanel.Dock" Value="Left" />
+                                    <Setter TargetName="ContentSite" Property="DockPanel.Dock" Value="Right" />
+                                    <Setter TargetName="ContentPanel" Property="Orientation" Value="Horizontal" />
+                                    <Setter TargetName="ContentPanel" Property="Height" Value="Auto" />
+                                    <Setter TargetName="HeaderSite" Property="Style" Value="{StaticResource MaterialDesignExpanderRightHeaderStyle}" />
+                                </Trigger>
+
+                                <Trigger Property="ExpandDirection" Value="Left">
+                                    <Setter TargetName="HeaderSite" Property="DockPanel.Dock" Value="Right" />
+                                    <Setter TargetName="ContentSite" Property="DockPanel.Dock" Value="Left" />
+                                    <Setter TargetName="ContentPanel" Property="Orientation" Value="Horizontal" />
+                                    <Setter TargetName="ContentPanel" Property="Height" Value="Auto" />
+                                    <Setter TargetName="HeaderSite" Property="Style" Value="{StaticResource MaterialDesignExpanderLeftHeaderStyle}" />
+                                </Trigger>
+
+                                <Trigger Property="ExpandDirection" Value="Up">
+                                    <Setter TargetName="HeaderSite" Property="DockPanel.Dock" Value="Bottom" />
+                                    <Setter TargetName="ContentSite" Property="DockPanel.Dock" Value="Top" />
+                                    <Setter TargetName="ContentPanel" Property="Orientation" Value="Vertical" />
+                                    <Setter TargetName="ContentPanel" Property="Width" Value="Auto" />
+                                    <Setter TargetName="HeaderSite" Property="Style" Value="{StaticResource MaterialDesignExpanderUpHeaderStyle}" />
+                                </Trigger>
+
+                                <Trigger Property="ExpandDirection" Value="Down">
+                                    <Setter TargetName="HeaderSite" Property="DockPanel.Dock" Value="Top" />
+                                    <Setter TargetName="ContentSite" Property="DockPanel.Dock" Value="Bottom" />
+                                    <Setter TargetName="ContentPanel" Property="Orientation" Value="Vertical" />
+                                    <Setter TargetName="ContentPanel" Property="Width" Value="Auto" />
+                                    <Setter TargetName="HeaderSite" Property="Style" Value="{StaticResource MaterialDesignExpanderDownHeaderStyle}" />
+                                </Trigger>
+                            </ControlTemplate.Triggers>
+                        </ControlTemplate>
+                    </Setter.Value>
+                </Setter>
+            </Style>
         </s:ApplicationLoader>
     </Application.Resources>
 </Application>

DiscordChatExporter.Gui/App.xaml.cs

@@ -1,16 +1,49 @@
 using System;
 using System.Reflection;
+using DiscordChatExporter.Gui.Internal;
+using MaterialDesignThemes.Wpf;
 
 namespace DiscordChatExporter.Gui
 {
     public partial class App
     {
-        private static readonly Assembly Assembly = typeof(App).Assembly;
+        private static Assembly Assembly { get; } = typeof(App).Assembly;
 
-        public static string Name => Assembly.GetName().Name!;
+        public static string Name { get; } = Assembly.GetName().Name!;
 
-        public static Version Version => Assembly.GetName().Version!;
+        public static Version Version { get; } = Assembly.GetName().Version!;
 
-        public static string VersionString => Version.ToString(3);
+        public static string VersionString { get; } = Version.ToString(3);
+
+        public static string GitHubProjectUrl { get; } = "https://github.com/Tyrrrz/DiscordChatExporter";
+
+        public static string GitHubProjectWikiUrl { get; } = GitHubProjectUrl + "/wiki";
+    }
+
+    public partial class App
+    {
+        private static Theme LightTheme { get; } = Theme.Create(
+            new MaterialDesignLightTheme(),
+            MediaColor.FromHex("#343838"),
+            MediaColor.FromHex("#F9A825")
+        );
+
+        private static Theme DarkTheme { get; } = Theme.Create(
+            new MaterialDesignDarkTheme(),
+            MediaColor.FromHex("#E8E8E8"),
+            MediaColor.FromHex("#F9A825")
+        );
+
+        public static void SetLightTheme()
+        {
+            var paletteHelper = new PaletteHelper();
+            paletteHelper.SetTheme(LightTheme);
+        }
+
+        public static void SetDarkTheme()
+        {
+            var paletteHelper = new PaletteHelper();
+            paletteHelper.SetTheme(DarkTheme);
+        }
     }
 }

DiscordChatExporter.Gui/Behaviors/MultiSelectionListBoxBehavior.cs

@@ -31,9 +31,9 @@ namespace DiscordChatExporter.Gui.Behaviors
         private bool _viewHandled;
         private bool _modelHandled;
 
-        public IList SelectedItems
+        public IList? SelectedItems
         {
-            get => (IList) GetValue(SelectedItemsProperty);
+            get => (IList?) GetValue(SelectedItemsProperty);
             set => SetValue(SelectedItemsProperty, value);
         }
 

DiscordChatExporter.Gui/Bootstrapper.cs

@@ -13,6 +13,15 @@ namespace DiscordChatExporter.Gui
 {
     public class Bootstrapper : Bootstrapper<RootViewModel>
     {
+        protected override void OnStart()
+        {
+            base.OnStart();
+
+            // Set default theme
+            // (preferred theme will be chosen later, once the settings are loaded)
+            App.SetLightTheme();
+        }
+
         protected override void ConfigureIoC(IStyletIoCBuilder builder)
         {
             base.ConfigureIoC(builder);

DiscordChatExporter.Gui/Converters/ExportFormatToStringConverter.cs

@@ -18,9 +18,7 @@ namespace DiscordChatExporter.Gui.Converters
             return default(string);
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
-        {
-            throw new NotImplementedException();
-        }
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) =>
+            throw new NotSupportedException();
     }
 }

DiscordChatExporter.Gui/Converters/TimeSpanToDateTimeConverter.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace DiscordChatExporter.Gui.Converters
+{
+    [ValueConversion(typeof(TimeSpan?), typeof(DateTime?))]
+    public class TimeSpanToDateTimeConverter : IValueConverter
+    {
+        public static TimeSpanToDateTimeConverter Instance { get; } = new TimeSpanToDateTimeConverter();
+
+        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is TimeSpan timeSpanValue)
+                return DateTime.Today.Add(timeSpanValue);
+
+            return default(DateTime?);
+        }
+
+        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is DateTime dateTimeValue)
+                return dateTimeValue.TimeOfDay;
+
+            return default(TimeSpan?);
+        }
+    }
+}

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -18,11 +18,11 @@
     <PackageReference Include="MaterialDesignThemes" Version="3.0.1" />
     <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.19" />
     <PackageReference Include="Ookii.Dialogs.Wpf" Version="1.1.0" />
-    <PackageReference Include="Onova" Version="2.6.1" />
+    <PackageReference Include="Onova" Version="2.6.2" />
     <PackageReference Include="Stylet" Version="1.3.4" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
     <PackageReference Include="Tyrrrz.Settings" Version="1.3.4" />
-    <PackageReference Include="PropertyChanged.Fody" Version="3.2.8" PrivateAssets="all" />
+    <PackageReference Include="PropertyChanged.Fody" Version="3.2.10" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>

DiscordChatExporter.Gui/FodyWeavers.xsd

@@ -11,6 +11,16 @@
                 <xs:documentation>Used to control if the On_PropertyName_Changed feature is enabled.</xs:documentation>
               </xs:annotation>
             </xs:attribute>
+            <xs:attribute name="TriggerDependentProperties" type="xs:boolean">
+              <xs:annotation>
+                <xs:documentation>Used to control if the Dependent properties feature is enabled.</xs:documentation>
+              </xs:annotation>
+            </xs:attribute>
+            <xs:attribute name="EnableIsChangedProperty" type="xs:boolean">
+              <xs:annotation>
+                <xs:documentation>Used to control if the IsChanged property feature is enabled.</xs:documentation>
+              </xs:annotation>
+            </xs:attribute>
             <xs:attribute name="EventInvokerNames" type="xs:string">
               <xs:annotation>
                 <xs:documentation>Used to change the name of the method that fires the notify event. This is a string that accepts multiple values in a comma separated form.</xs:documentation>

DiscordChatExporter.Gui/Internal/MediaColor.cs

@@ -0,0 +1,9 @@
+using System.Windows.Media;
+
+namespace DiscordChatExporter.Gui.Internal
+{
+    internal static class MediaColor
+    {
+        public static Color FromHex(string hex) => (Color) ColorConverter.ConvertFromString(hex);
+    }
+}

DiscordChatExporter.Gui/Internal/ProcessEx.cs

@@ -11,8 +11,7 @@ namespace DiscordChatExporter.Gui.Internal
                 UseShellExecute = true
             };
 
-            using (Process.Start(startInfo))
-            { }
+            using (Process.Start(startInfo)) {}
         }
     }
 }

DiscordChatExporter.Gui/Services/SettingsService.cs

@@ -6,14 +6,18 @@ namespace DiscordChatExporter.Gui.Services
 {
     public class SettingsService : SettingsManager
     {
-        public string DateFormat { get; set; } = "dd-MMM-yy hh:mm tt";
-
         public bool IsAutoUpdateEnabled { get; set; } = true;
 
+        public bool IsDarkModeEnabled { get; set; }
+
         public bool IsTokenPersisted { get; set; } = true;
 
+        public string DateFormat { get; set; } = "dd-MMM-yy hh:mm tt";
+
         public int ParallelLimit { get; set; } = 1;
 
+        public bool ShouldReuseMedia { get; set; }
+
         public AuthToken? LastToken { get; set; }
 
         public ExportFormat LastExportFormat { get; set; } = ExportFormat.HtmlDark;

DiscordChatExporter.Gui/Services/UpdateService.cs

@@ -10,7 +10,8 @@ namespace DiscordChatExporter.Gui.Services
     {
         private readonly IUpdateManager _updateManager = new UpdateManager(
             new GithubPackageResolver("Tyrrrz", "DiscordChatExporter", "DiscordChatExporter.zip"),
-            new ZipPackageExtractor());
+            new ZipPackageExtractor()
+        );
 
         private readonly SettingsService _settingsService;
 

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -26,9 +26,23 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 
         public ExportFormat SelectedFormat { get; set; }
 
-        public DateTimeOffset? After { get; set; }
+        // This date/time abomination is required because we use separate controls to set these
 
-        public DateTimeOffset? Before { get; set; }
+        public DateTimeOffset? AfterDate { get; set; }
+
+        public bool IsAfterDateSet => AfterDate != null;
+
+        public TimeSpan? AfterTime { get; set; }
+
+        public DateTimeOffset? After => AfterDate?.Add(AfterTime ?? TimeSpan.Zero);
+
+        public DateTimeOffset? BeforeDate { get; set; }
+
+        public bool IsBeforeDateSet => BeforeDate != null;
+
+        public TimeSpan? BeforeTime { get; set; }
+
+        public DateTimeOffset? Before => BeforeDate?.Add(BeforeTime ?? TimeSpan.Zero);
 
         public int? PartitionLimit { get; set; }
 
@@ -60,17 +74,17 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
             _settingsService.LastPartitionLimit = PartitionLimit;
             _settingsService.LastShouldDownloadMedia = ShouldDownloadMedia;
 
-            // Clamp 'after' and 'before' values
-            if (After > Before)
-                After = Before;
-            if (Before < After)
-                Before = After;
-
             // If single channel - prompt file path
-            if (IsSingleChannel)
+            if (Channels != null && IsSingleChannel)
             {
                 var channel = Channels.Single();
-                var defaultFileName = ExportRequest.GetDefaultOutputFileName(Guild!, channel, SelectedFormat, After, Before);
+                var defaultFileName = ExportRequest.GetDefaultOutputFileName(
+                    Guild!,
+                    channel,
+                    SelectedFormat,
+                    After,
+                    Before
+                );
 
                 // Filter
                 var ext = SelectedFormat.GetFileExtension();
@@ -84,11 +98,24 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
                 OutputPath = _dialogManager.PromptDirectoryPath();
             }
 
-            // If canceled - return
             if (string.IsNullOrWhiteSpace(OutputPath))
                 return;
 
             Close(true);
         }
     }
+
+    public static class ExportSetupViewModelExtensions
+    {
+        public static ExportSetupViewModel CreateExportSetupViewModel(this IViewModelFactory factory,
+            Guild guild, IReadOnlyList<Channel> channels)
+        {
+            var viewModel = factory.CreateExportSetupViewModel();
+
+            viewModel.Guild = guild;
+            viewModel.Channels = channels;
+
+            return viewModel;
+        }
+    }
 }

DiscordChatExporter.Gui/ViewModels/Dialogs/SettingsViewModel.cs

@@ -8,29 +8,41 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
     {
         private readonly SettingsService _settingsService;
 
-        public string DateFormat
-        {
-            get => _settingsService.DateFormat;
-            set => _settingsService.DateFormat = value;
-        }
-
         public bool IsAutoUpdateEnabled
         {
             get => _settingsService.IsAutoUpdateEnabled;
             set => _settingsService.IsAutoUpdateEnabled = value;
         }
 
+        public bool IsDarkModeEnabled
+        {
+            get => _settingsService.IsDarkModeEnabled;
+            set => _settingsService.IsDarkModeEnabled = value;
+        }
+
         public bool IsTokenPersisted
         {
             get => _settingsService.IsTokenPersisted;
             set => _settingsService.IsTokenPersisted = value;
         }
 
+        public string DateFormat
+        {
+            get => _settingsService.DateFormat;
+            set => _settingsService.DateFormat = value;
+        }
+
         public int ParallelLimit
         {
             get => _settingsService.ParallelLimit;
             set => _settingsService.ParallelLimit = value.Clamp(1, 10);
         }
+        
+        public bool ShouldReuseMedia
+        {
+            get => _settingsService.ShouldReuseMedia;
+            set => _settingsService.ShouldReuseMedia = value;
+        }
 
         public SettingsViewModel(SettingsService settingsService)
         {

DiscordChatExporter.Gui/ViewModels/Framework/DialogManager.cs

@@ -19,13 +19,10 @@ namespace DiscordChatExporter.Gui.ViewModels.Framework
 
         public async ValueTask<T> ShowDialogAsync<T>(DialogScreen<T> dialogScreen)
         {
-            // Get the view that renders this viewmodel
             var view = _viewManager.CreateAndBindViewForModelIfNecessary(dialogScreen);
 
-            // Set up event routing that will close the view when called from viewmodel
             void OnDialogOpened(object? sender, DialogOpenedEventArgs openArgs)
             {
-                // Delegate to close the dialog and unregister event handler
                 void OnScreenClosed(object? o, EventArgs closeArgs)
                 {
                     openArgs.Session.Close();
@@ -35,37 +32,31 @@ namespace DiscordChatExporter.Gui.ViewModels.Framework
                 dialogScreen.Closed += OnScreenClosed;
             }
 
-            // Show view
             await DialogHost.Show(view, OnDialogOpened);
 
-            // Return the result
             return dialogScreen.DialogResult;
         }
 
         public string? PromptSaveFilePath(string filter = "All files|*.*", string defaultFilePath = "")
         {
-            // Create dialog
             var dialog = new SaveFileDialog
             {
                 Filter = filter,
                 AddExtension = true,
                 FileName = defaultFilePath,
-                DefaultExt = Path.GetExtension(defaultFilePath) ?? ""
+                DefaultExt = Path.GetExtension(defaultFilePath)
             };
 
-            // Show dialog and return result
             return dialog.ShowDialog() == true ? dialog.FileName : null;
         }
 
         public string? PromptDirectoryPath(string defaultDirPath = "")
         {
-            // Create dialog
             var dialog = new VistaFolderBrowserDialog
             {
                 SelectedPath = defaultDirPath
             };
 
-            // Show dialog and return result
             return dialog.ShowDialog() == true ? dialog.SelectedPath : null;
         }
     }

DiscordChatExporter.Gui/ViewModels/Framework/Extensions.cs

@@ -1,19 +0,0 @@
-using System.Collections.Generic;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Gui.ViewModels.Dialogs;
-
-namespace DiscordChatExporter.Gui.ViewModels.Framework
-{
-    public static class Extensions
-    {
-        public static ExportSetupViewModel CreateExportSetupViewModel(this IViewModelFactory factory,
-            Guild guild, IReadOnlyList<Channel> channels)
-        {
-            var viewModel = factory.CreateExportSetupViewModel();
-            viewModel.Guild = guild;
-            viewModel.Channels = channels;
-
-            return viewModel;
-        }
-    }
-}

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -8,7 +8,9 @@ using DiscordChatExporter.Domain.Discord.Models;
 using DiscordChatExporter.Domain.Exceptions;
 using DiscordChatExporter.Domain.Exporting;
 using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Gui.Internal;
 using DiscordChatExporter.Gui.Services;
+using DiscordChatExporter.Gui.ViewModels.Dialogs;
 using DiscordChatExporter.Gui.ViewModels.Framework;
 using Gress;
 using MaterialDesignThemes.Wpf;
@@ -63,14 +65,21 @@ namespace DiscordChatExporter.Gui.ViewModels
 
             // Update busy state when progress manager changes
             ProgressManager.Bind(o => o.IsActive,
-                (sender, args) => IsBusy = ProgressManager.IsActive);
+                (sender, args) => IsBusy = ProgressManager.IsActive
+            );
+
             ProgressManager.Bind(o => o.IsActive,
-                (sender, args) => IsProgressIndeterminate = ProgressManager.IsActive && ProgressManager.Progress.IsEither(0, 1));
+                (sender, args) => IsProgressIndeterminate =
+                    ProgressManager.IsActive && ProgressManager.Progress.IsEither(0, 1)
+            );
+
             ProgressManager.Bind(o => o.Progress,
-                (sender, args) => IsProgressIndeterminate = ProgressManager.IsActive && ProgressManager.Progress.IsEither(0, 1));
+                (sender, args) => IsProgressIndeterminate =
+                    ProgressManager.IsActive && ProgressManager.Progress.IsEither(0, 1)
+            );
         }
 
-        private async ValueTask HandleAutoUpdateAsync()
+        private async ValueTask CheckForUpdatesAsync()
         {
             try
             {
@@ -108,7 +117,16 @@ namespace DiscordChatExporter.Gui.ViewModels
                 TokenValue = _settingsService.LastToken.Value;
             }
 
-            await HandleAutoUpdateAsync();
+            if (_settingsService.IsDarkModeEnabled)
+            {
+                App.SetDarkTheme();
+            }
+            else
+            {
+                App.SetLightTheme();
+            }
+
+            await CheckForUpdatesAsync();
         }
 
         protected override void OnClose()
@@ -125,6 +143,8 @@ namespace DiscordChatExporter.Gui.ViewModels
             await _dialogManager.ShowDialogAsync(dialog);
         }
 
+        public void ShowHelp() => ProcessEx.StartShellExecute(App.GitHubProjectWikiUrl);
+
         public bool CanPopulateGuildsAndChannels =>
             !IsBusy && !string.IsNullOrWhiteSpace(TokenValue);
 
@@ -150,11 +170,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                 var guildChannelMap = new Dictionary<Guild, IReadOnlyList<Channel>>();
                 await foreach (var guild in discord.GetUserGuildsAsync())
                 {
-                    var channels = await discord.GetGuildChannelsAsync(guild.Id);
-                    guildChannelMap[guild] = channels
-                        .OrderBy(c => c.Category)
-                        .ThenBy(c => c.Name)
-                        .ToArray();
+                    guildChannelMap[guild] = await discord.GetGuildChannelsAsync(guild.Id);
                 }
 
                 GuildChannelMap = guildChannelMap;
@@ -182,8 +198,8 @@ namespace DiscordChatExporter.Gui.ViewModels
             var exporter = new ChannelExporter(token);
 
             var operations = ProgressManager.CreateOperations(dialog.Channels!.Count);
-
             var successfulExportCount = 0;
+
             await dialog.Channels.Zip(operations).ParallelForEachAsync(async tuple =>
             {
                 var (channel, operation) = tuple;
@@ -199,6 +215,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                         dialog.Before,
                         dialog.PartitionLimit,
                         dialog.ShouldDownloadMedia,
+                        _settingsService.ShouldReuseMedia,
                         _settingsService.DateFormat
                     );
 

DiscordChatExporter.Gui/Views/Dialogs/ExportSetupView.xaml

@@ -48,12 +48,13 @@
                 Margin="8,0,0,0"
                 VerticalAlignment="Center"
                 FontSize="19"
+                FontWeight="Light"
                 TextTrimming="CharacterEllipsis"
                 Visibility="{Binding IsSingleChannel, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
                 <Run Text="{Binding Channels[0].Category, Mode=OneWay}" ToolTip="{Binding Channels[0].Category, Mode=OneWay}" />
                 <Run Text="/" />
                 <Run
-                    Foreground="{DynamicResource PrimaryTextBrush}"
+                    FontWeight="SemiBold"
                     Text="{Binding Channels[0].Name, Mode=OneWay}"
                     ToolTip="{Binding Channels[0].Name, Mode=OneWay}" />
             </TextBlock>
@@ -82,36 +83,58 @@
                     <ColumnDefinition Width="*" />
                     <ColumnDefinition Width="*" />
                 </Grid.ColumnDefinitions>
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="*" />
+                    <RowDefinition Height="*" />
+                </Grid.RowDefinitions>
                 <DatePicker
                     Grid.Row="0"
                     Grid.Column="0"
-                    Margin="16,8"
-                    materialDesign:HintAssist.Hint="From (optional)"
+                    Margin="16,8,16,4"
+                    materialDesign:HintAssist.Hint="After (date)"
                     materialDesign:HintAssist.IsFloating="True"
-                    DisplayDateEnd="{Binding Before, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    SelectedDate="{Binding After, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent after this date will be exported" />
+                    DisplayDateEnd="{Binding BeforeDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
+                    SelectedDate="{Binding AfterDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
+                    ToolTip="Only include messages sent after this date" />
                 <DatePicker
                     Grid.Row="0"
                     Grid.Column="1"
-                    Margin="16,8"
-                    materialDesign:HintAssist.Hint="To (optional)"
+                    Margin="16,8,16,4"
+                    materialDesign:HintAssist.Hint="Before (date)"
                     materialDesign:HintAssist.IsFloating="True"
-                    DisplayDateStart="{Binding After, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    SelectedDate="{Binding Before, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent before this date will be exported" />
+                    DisplayDateStart="{Binding AfterDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
+                    SelectedDate="{Binding BeforeDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
+                    ToolTip="Only include messages sent before this date" />
+                <materialDesign:TimePicker
+                    Grid.Row="1"
+                    Grid.Column="0"
+                    Margin="16,4,16,8"
+                    materialDesign:HintAssist.Hint="After (time)"
+                    materialDesign:HintAssist.IsFloating="True"
+                    IsEnabled="{Binding IsAfterDateSet}"
+                    SelectedTime="{Binding AfterTime, Converter={x:Static converters:TimeSpanToDateTimeConverter.Instance}}"
+                    ToolTip="Only include messages sent after this time" />
+                <materialDesign:TimePicker
+                    Grid.Row="1"
+                    Grid.Column="1"
+                    Margin="16,4,16,8"
+                    materialDesign:HintAssist.Hint="Before (time)"
+                    materialDesign:HintAssist.IsFloating="True"
+                    IsEnabled="{Binding IsBeforeDateSet}"
+                    SelectedTime="{Binding BeforeTime, Converter={x:Static converters:TimeSpanToDateTimeConverter.Instance}}"
+                    ToolTip="Only include messages sent before this time" />
             </Grid>
 
             <!--  Partitioning  -->
             <TextBox
                 Margin="16,8"
-                materialDesign:HintAssist.Hint="Messages per partition (optional)"
+                materialDesign:HintAssist.Hint="Messages per partition"
                 materialDesign:HintAssist.IsFloating="True"
                 Text="{Binding PartitionLimit, TargetNullValue=''}"
-                ToolTip="If this is set, the exported file will be split into multiple partitions, each containing no more than specified number of messages" />
+                ToolTip="Split output into partitions limited to this number of messages" />
 
             <!--  Download media  -->
-            <Grid Margin="16,16" ToolTip="If this is set, the export will include additional files such as user avatars, attached files, embedded images, etc">
+            <Grid Margin="16,16" ToolTip="Download referenced media content (user avatars, attached files, embedded images, etc)">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*" />
                     <ColumnDefinition Width="Auto" />
@@ -120,7 +143,7 @@
                 <TextBlock
                     Grid.Column="0"
                     VerticalAlignment="Center"
-                    Text="Download referenced media content" />
+                    Text="Download media" />
                 <ToggleButton
                     Grid.Column="1"
                     HorizontalAlignment="Right"
@@ -141,18 +164,13 @@
             <ToggleButton
                 x:Name="AdvancedSectionToggleButton"
                 Grid.Column="0"
-                Margin="8"
+                Width="24"
+                Height="24"
+                Margin="12"
                 Cursor="Hand"
-                Loaded="AdvancedSectionToggleButton_OnLoaded"
-                Style="{DynamicResource MaterialDesignFlatToggleButton}"
-                ToolTip="Show advanced options">
-                <ToggleButton.Content>
-                    <materialDesign:PackIcon
-                        Width="24"
-                        Height="24"
-                        Kind="Menu" />
-                </ToggleButton.Content>
-            </ToggleButton>
+                IsChecked="{Binding IsAdvancedSectionDisplayedByDefault, Mode=OneTime}"
+                Style="{DynamicResource MaterialDesignHamburgerToggleButton}"
+                ToolTip="Toggle advanced options" />
 
             <Button
                 Grid.Column="2"

DiscordChatExporter.Gui/Views/Dialogs/ExportSetupView.xaml.cs

@@ -1,7 +1,4 @@
-using System.Windows;
-using DiscordChatExporter.Gui.ViewModels.Dialogs;
-
-namespace DiscordChatExporter.Gui.Views.Dialogs
+namespace DiscordChatExporter.Gui.Views.Dialogs
 {
     public partial class ExportSetupView
     {
@@ -9,11 +6,5 @@ namespace DiscordChatExporter.Gui.Views.Dialogs
         {
             InitializeComponent();
         }
-
-        private void AdvancedSectionToggleButton_OnLoaded(object sender, RoutedEventArgs e)
-        {
-            if (DataContext is ExportSetupViewModel vm)
-                AdvancedSectionToggleButton.IsChecked = vm.IsAdvancedSectionDisplayedByDefault;
-        }
     }
 }

DiscordChatExporter.Gui/Views/Dialogs/SettingsView.xaml

@@ -7,7 +7,7 @@
     xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:s="https://github.com/canton7/Stylet"
-    Width="300"
+    Width="310"
     d:DataContext="{d:DesignInstance Type=dialogs:SettingsViewModel}"
     Style="{DynamicResource MaterialDesignRoot}"
     mc:Ignorable="d">
@@ -15,17 +15,8 @@
         <TextBlock
             Margin="16"
             FontSize="17"
-            Foreground="{DynamicResource PrimaryTextBrush}"
             Text="Settings" />
 
-        <!--  Date format  -->
-        <TextBox
-            Margin="16,8"
-            materialDesign:HintAssist.Hint="Date format"
-            materialDesign:HintAssist.IsFloating="True"
-            Text="{Binding DateFormat}"
-            ToolTip="Format used when rendering dates (refer to .NET date format)" />
-
         <!--  Auto-updates  -->
         <DockPanel
             Background="Transparent"
@@ -41,6 +32,24 @@
                 IsChecked="{Binding IsAutoUpdateEnabled}" />
         </DockPanel>
 
+        <!--  Dark mode  -->
+        <DockPanel
+            Background="Transparent"
+            LastChildFill="False"
+            ToolTip="Use darker colors in the UI">
+            <TextBlock
+                Margin="16,8"
+                DockPanel.Dock="Left"
+                Text="Dark mode" />
+            <ToggleButton
+                x:Name="DarkModeToggleButton"
+                Margin="16,8"
+                Checked="DarkModeToggleButton_Checked"
+                DockPanel.Dock="Right"
+                IsChecked="{Binding IsDarkModeEnabled}"
+                Unchecked="DarkModeToggleButton_Unchecked" />
+        </DockPanel>
+
         <!--  Persist token  -->
         <DockPanel
             Background="Transparent"
@@ -56,14 +65,37 @@
                 IsChecked="{Binding IsTokenPersisted}" />
         </DockPanel>
 
+        <!--  Reuse media  -->
+        <DockPanel
+            Background="Transparent"
+            LastChildFill="False"
+            ToolTip="Reuse already existing media content to skip redundant downloads">
+            <TextBlock
+                Margin="16,8"
+                DockPanel.Dock="Left"
+                Text="Reuse downloaded media" />
+            <ToggleButton
+                Margin="16,8"
+                DockPanel.Dock="Right"
+                IsChecked="{Binding ShouldReuseMedia}" />
+        </DockPanel>
+
+        <!--  Date format  -->
+        <TextBox
+            Margin="16,8"
+            materialDesign:HintAssist.Hint="Date format"
+            materialDesign:HintAssist.IsFloating="True"
+            Text="{Binding DateFormat}"
+            ToolTip="Format used when writing dates (uses .NET date formatting rules)" />
+
         <!--  Parallel limit  -->
         <StackPanel Background="Transparent" ToolTip="How many channels can be exported at the same time">
-            <TextBlock Margin="16,8">
+            <TextBlock Margin="16,8,16,4">
                 <Run Text="Parallel limit:" />
-                <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding ParallelLimit, Mode=OneWay}" />
+                <Run Text="{Binding ParallelLimit, Mode=OneWay}" />
             </TextBlock>
             <Slider
-                Margin="16,8"
+                Margin="16,4,16,8"
                 IsSnapToTickEnabled="True"
                 Maximum="10"
                 Minimum="1"

DiscordChatExporter.Gui/Views/Dialogs/SettingsView.xaml.cs

@@ -1,4 +1,6 @@
-namespace DiscordChatExporter.Gui.Views.Dialogs
+using System.Windows;
+
+namespace DiscordChatExporter.Gui.Views.Dialogs
 {
     public partial class SettingsView
     {
@@ -6,5 +8,11 @@
         {
             InitializeComponent();
         }
+
+        private void DarkModeToggleButton_Checked(object sender, RoutedEventArgs e) =>
+            App.SetDarkTheme();
+
+        private void DarkModeToggleButton_Unchecked(object sender, RoutedEventArgs e) =>
+            App.SetLightTheme();
     }
 }

DiscordChatExporter.Gui/Views/RootView.xaml

@@ -3,6 +3,7 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:behaviors="clr-namespace:DiscordChatExporter.Gui.Behaviors"
+    xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
     xmlns:converters="clr-namespace:DiscordChatExporter.Gui.Converters"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
@@ -23,6 +24,18 @@
     <Window.TaskbarItemInfo>
         <TaskbarItemInfo ProgressState="Normal" ProgressValue="{Binding ProgressManager.Progress}" />
     </Window.TaskbarItemInfo>
+    <Window.Resources>
+        <CollectionViewSource x:Key="AvailableChannelsViewSource" Source="{Binding AvailableChannels, Mode=OneWay}">
+            <CollectionViewSource.GroupDescriptions>
+                <PropertyGroupDescription PropertyName="Category" />
+            </CollectionViewSource.GroupDescriptions>
+            <CollectionViewSource.SortDescriptions>
+                <componentModel:SortDescription Direction="Ascending" PropertyName="Category" />
+                <componentModel:SortDescription Direction="Ascending" PropertyName="Name" />
+            </CollectionViewSource.SortDescriptions>
+        </CollectionViewSource>
+    </Window.Resources>
+
     <materialDesign:DialogHost SnackbarMessageQueue="{Binding Notifications}" Style="{DynamicResource MaterialDesignEmbeddedDialogHost}">
         <Grid>
             <Grid.RowDefinitions>
@@ -33,10 +46,7 @@
             </Grid.RowDefinitions>
 
             <!--  Toolbar  -->
-            <Grid
-                Grid.Row="0"
-                Background="{DynamicResource PrimaryHueMidBrush}"
-                TextElement.Foreground="{DynamicResource SecondaryInverseTextBrush}">
+            <Grid Grid.Row="0" Background="{DynamicResource MaterialDesignDarkBackground}">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*" />
                     <ColumnDefinition Width="Auto" />
@@ -111,8 +121,12 @@
                     Margin="6"
                     Padding="4"
                     Command="{s:Action ShowSettings}"
-                    Style="{DynamicResource MaterialDesignFlatDarkButton}"
+                    Foreground="{DynamicResource MaterialDesignDarkForeground}"
+                    Style="{DynamicResource MaterialDesignFlatButton}"
                     ToolTip="Settings">
+                    <Button.Resources>
+                        <SolidColorBrush x:Key="MaterialDesignFlatButtonClick" Color="#4C4C4C" />
+                    </Button.Resources>
                     <materialDesign:PackIcon
                         Width="24"
                         Height="24"
@@ -123,12 +137,20 @@
             <!--  Progress bar  -->
             <ProgressBar
                 Grid.Row="1"
-                Background="{DynamicResource PrimaryHueMidBrush}"
+                Background="{DynamicResource MaterialDesignDarkBackground}"
                 IsIndeterminate="{Binding IsProgressIndeterminate}"
                 Value="{Binding ProgressManager.Progress, Mode=OneWay}" />
 
             <!--  Content  -->
-            <Grid Grid.Row="2" IsEnabled="{Binding IsBusy, Converter={x:Static converters:InverseBoolConverter.Instance}}">
+            <Grid
+                Grid.Row="2"
+                Background="{DynamicResource MaterialDesignCardBackground}"
+                IsEnabled="{Binding IsBusy, Converter={x:Static converters:InverseBoolConverter.Instance}}">
+                <Grid.Resources>
+                    <Style TargetType="TextBlock">
+                        <Setter Property="FontWeight" Value="Light" />
+                    </Style>
+                </Grid.Resources>
                 <!--  Placeholder / usage instructions  -->
                 <Grid Margin="32,32,8,8" Visibility="{Binding AvailableGuilds, Converter={x:Static s:BoolToVisibilityConverter.InverseInstance}}">
                     <!--  For user token  -->
@@ -138,25 +160,25 @@
                             <Run Text="1. Open Discord" />
                             <LineBreak />
                             <Run Text="2. Press" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Ctrl+Shift+I" />
+                            <Run FontWeight="SemiBold" Text="Ctrl+Shift+I" />
                             <Run Text="to show developer tools" />
                             <LineBreak />
                             <Run Text="3. Navigate to the" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Application" />
+                            <Run FontWeight="SemiBold" Text="Application" />
                             <Run Text="tab" />
                             <LineBreak />
                             <Run Text="4. Select" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Local Storage" />
+                            <Run FontWeight="SemiBold" Text="Local Storage" />
                             <Run Text="&gt;" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="https://discord.com" />
+                            <Run FontWeight="SemiBold" Text="https://discord.com" />
                             <Run Text="on the left" />
                             <LineBreak />
                             <Run Text="5. Press" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Ctrl+R" />
+                            <Run FontWeight="SemiBold" Text="Ctrl+R" />
                             <Run Text="to reload" />
                             <LineBreak />
                             <Run Text="6. Find" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="token" />
+                            <Run FontWeight="SemiBold" Text="token" />
                             <Run Text="at the bottom and copy the value" />
                         </TextBlock>
                         <TextBlock Margin="0,24,0,0" FontSize="14">
@@ -164,41 +186,55 @@
                             <LineBreak />
                             <Run Text="To authorize using bot token instead, click" />
                             <InlineUIContainer>
-                                <materialDesign:PackIcon Margin="1,0,0,-3" Kind="Account" />
+                                <materialDesign:PackIcon
+                                    Margin="1,0,0,-3"
+                                    Foreground="{DynamicResource PrimaryHueMidBrush}"
+                                    Kind="Account" />
                             </InlineUIContainer>
+                            <Run Text="in the text box above." />
                         </TextBlock>
                         <TextBlock Margin="0,24,0,0" FontSize="14">
                             <Run Text="For more information, check out the" />
-                            <Hyperlink NavigateUri="https://github.com/Tyrrrz/DiscordChatExporter/wiki" RequestNavigate="Hyperlink_OnRequestNavigate">wiki</Hyperlink><Run Text="." />
+                            <Hyperlink Command="{s:Action ShowHelp}">wiki</Hyperlink><Run Text="." />
                         </TextBlock>
                     </StackPanel>
 
                     <!--  For bot token  -->
                     <StackPanel Visibility="{Binding IsBotToken, Converter={x:Static s:BoolToVisibilityConverter.Instance}}">
-                        <TextBlock FontSize="18" Text="Please provide your bot token to authorize" />
-                        <TextBlock Margin="8,8,0,0" FontSize="14">
+                        <TextBlock
+                            FontSize="18"
+                            FontWeight="Light"
+                            Text="Please provide your bot token to authorize" />
+                        <TextBlock
+                            Margin="8,8,0,0"
+                            FontSize="14"
+                            FontWeight="Light">
                             <Run Text="1. Open Discord developer portal" />
                             <LineBreak />
                             <Run Text="2. Open your application's settings" />
                             <LineBreak />
                             <Run Text="3. Navigate to the" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Bot" />
+                            <Run FontWeight="SemiBold" Text="Bot" />
                             <Run Text="section on the left" />
                             <LineBreak />
                             <Run Text="4. Under" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Token" />
+                            <Run FontWeight="SemiBold" Text="Token" />
                             <Run Text="click" />
-                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="Copy" />
+                            <Run FontWeight="SemiBold" Text="Copy" />
                         </TextBlock>
                         <TextBlock Margin="0,24,0,0" FontSize="14">
                             <Run Text="To authorize using user token instead, click" />
                             <InlineUIContainer>
-                                <materialDesign:PackIcon Margin="1,0,0,-1" Kind="Robot" />
+                                <materialDesign:PackIcon
+                                    Margin="1,0,0,-1"
+                                    Foreground="{DynamicResource PrimaryHueMidBrush}"
+                                    Kind="Robot" />
                             </InlineUIContainer>
+                            <Run Text="in the text box above." />
                         </TextBlock>
                         <TextBlock Margin="0,24,0,0" FontSize="14">
                             <Run Text="For more information, check out the" />
-                            <Hyperlink NavigateUri="https://github.com/Tyrrrz/DiscordChatExporter/wiki" RequestNavigate="Hyperlink_OnRequestNavigate">wiki</Hyperlink><Run Text="." />
+                            <Hyperlink Command="{s:Action ShowHelp}">wiki</Hyperlink><Run Text="." />
                         </TextBlock>
                     </StackPanel>
                 </Grid>
@@ -213,7 +249,7 @@
                     <!--  Guilds  -->
                     <Border
                         Grid.Column="0"
-                        BorderBrush="{DynamicResource DividerBrush}"
+                        BorderBrush="{DynamicResource MaterialDesignDivider}"
                         BorderThickness="0,0,1,0">
                         <ListBox
                             ItemsSource="{Binding AvailableGuilds}"
@@ -232,13 +268,15 @@
                                             Width="48"
                                             Height="48"
                                             Margin="12,4,12,4"
-                                            Fill="{DynamicResource DividerBrush}" />
+                                            Fill="{DynamicResource MaterialDesignDivider}" />
 
                                         <!--  Guild icon  -->
                                         <Ellipse
                                             Width="48"
                                             Height="48"
-                                            Margin="12,4,12,4">
+                                            Margin="12,4,12,4"
+                                            Stroke="{DynamicResource MaterialDesignDivider}"
+                                            StrokeThickness="1">
                                             <Ellipse.Fill>
                                                 <ImageBrush ImageSource="{Binding IconUrl}" />
                                             </Ellipse.Fill>
@@ -253,12 +291,37 @@
                     <Border Grid.Column="1">
                         <ListBox
                             HorizontalContentAlignment="Stretch"
-                            ItemsSource="{Binding AvailableChannels}"
+                            ItemsSource="{Binding Source={StaticResource AvailableChannelsViewSource}}"
                             SelectionMode="Extended"
-                            TextSearch.TextPath="Model.Name">
+                            TextSearch.TextPath="Model.Name"
+                            VirtualizingPanel.IsVirtualizingWhenGrouping="True">
                             <i:Interaction.Behaviors>
                                 <behaviors:ChannelMultiSelectionListBoxBehavior SelectedItems="{Binding SelectedChannels}" />
                             </i:Interaction.Behaviors>
+                            <ListBox.GroupStyle>
+                                <GroupStyle>
+                                    <GroupStyle.ContainerStyle>
+                                        <Style TargetType="{x:Type GroupItem}">
+                                            <Setter Property="Template">
+                                                <Setter.Value>
+                                                    <ControlTemplate d:DataContext="{x:Type CollectionViewGroup}">
+                                                        <Expander
+                                                            Margin="0"
+                                                            Padding="0"
+                                                            Background="Transparent"
+                                                            BorderBrush="{DynamicResource MaterialDesignDivider}"
+                                                            BorderThickness="0,0,0,1"
+                                                            Header="{Binding Name}"
+                                                            IsExpanded="False">
+                                                            <ItemsPresenter />
+                                                        </Expander>
+                                                    </ControlTemplate>
+                                                </Setter.Value>
+                                            </Setter>
+                                        </Style>
+                                    </GroupStyle.ContainerStyle>
+                                </GroupStyle>
+                            </ListBox.GroupStyle>
                             <ListBox.ItemTemplate>
                                 <DataTemplate>
                                     <Grid Margin="-8" Background="Transparent">
@@ -278,16 +341,13 @@
                                             VerticalAlignment="Center"
                                             Kind="Pound" />
 
-                                        <!--  Channel category / name  -->
+                                        <!--  Channel name  -->
                                         <TextBlock
                                             Grid.Column="1"
                                             Margin="3,8,8,8"
                                             VerticalAlignment="Center"
-                                            FontSize="14">
-                                            <Run Foreground="{DynamicResource SecondaryTextBrush}" Text="{Binding Category, Mode=OneWay}" />
-                                            <Run Text="/" />
-                                            <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding Name, Mode=OneWay}" />
-                                        </TextBlock>
+                                            FontSize="14"
+                                            Text="{Binding Name, Mode=OneWay}" />
 
                                         <!--  Is selected checkmark  -->
                                         <materialDesign:PackIcon

DiscordChatExporter.Gui/Views/RootView.xaml.cs

@@ -1,7 +1,4 @@
-using System.Windows.Navigation;
-using DiscordChatExporter.Gui.Internal;
-
-namespace DiscordChatExporter.Gui.Views
+namespace DiscordChatExporter.Gui.Views
 {
     public partial class RootView
     {
@@ -9,11 +6,5 @@ namespace DiscordChatExporter.Gui.Views
         {
             InitializeComponent();
         }
-
-        private void Hyperlink_OnRequestNavigate(object sender, RequestNavigateEventArgs e)
-        {
-            ProcessEx.StartShellExecute(e.Uri.AbsoluteUri);
-            e.Handled = true;
-        }
     }
 }

DiscordChatExporter.props

@@ -2,11 +2,12 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>2.21.2</Version>
+    <Version>2.24</Version>
     <Company>Tyrrrz</Company>
     <Copyright>Copyright (c) Alexey Golub</Copyright>
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
+    <WarningsAsErrors>nullable</WarningsAsErrors>
   </PropertyGroup>
 
 </Project>

Readme.md

@@ -8,12 +8,13 @@
 
 DiscordChatExporter can be used to export message history from a [Discord](https://discord.com) channel to a file. It works with direct messages, group messages, server channels, supports Discord's dialect of markdown and all other rich media features.
 
-_For guides and other info -- check out the [wiki](https://github.com/Tyrrrz/DiscordChatExporter/wiki)._
+Have questions? Check out the [wiki](https://github.com/Tyrrrz/DiscordChatExporter/wiki) first.
 
 ## Download
 
 - **[Latest release](https://github.com/Tyrrrz/DiscordChatExporter/releases/latest)**
 - [Docker image](https://hub.docker.com/r/tyrrrz/discordchatexporter): `docker pull tyrrrz/discordchatexporter`
+- [AUR](https://aur.archlinux.org/packages/discord-chat-exporter-cli/): `yay -S discord-chat-exporter-cli`
 - [CI build](https://github.com/Tyrrrz/DiscordChatExporter/actions)
 
 Note: This application requires .NET Core runtime in order to run:
@@ -37,4 +38,4 @@ Note: This application requires .NET Core runtime in order to run:
 ## Screenshots
 
 ![channel list](.screenshots/list.png)
-![rendered output](.screenshots/output.png)
+![rendered output](.screenshots/output.png)