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 +1,19 @@
+### 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))

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="1.3.2" />
+    <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/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/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

@@ -14,69 +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}" />
@@ -84,7 +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" />
@@ -94,27 +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}">
-                <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
-            </Style>
+            <Style BasedOn="{StaticResource MaterialDesignTimePicker}" TargetType="{x:Type materialDesign:TimePicker}" />
 
             <Style
                 x:Key="MaterialDesignFlatDarkButton"

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/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

@@ -75,10 +75,16 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
             _settingsService.LastShouldDownloadMedia = ShouldDownloadMedia;
 
             // 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();
@@ -92,11 +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);
 
@@ -178,8 +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;
@@ -195,6 +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>
@@ -94,7 +95,7 @@
                     materialDesign:HintAssist.IsFloating="True"
                     DisplayDateEnd="{Binding BeforeDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
                     SelectedDate="{Binding AfterDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent after this date will be exported" />
+                    ToolTip="Only include messages sent after this date" />
                 <DatePicker
                     Grid.Row="0"
                     Grid.Column="1"
@@ -103,7 +104,7 @@
                     materialDesign:HintAssist.IsFloating="True"
                     DisplayDateStart="{Binding AfterDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
                     SelectedDate="{Binding BeforeDate, Converter={x:Static converters:DateTimeOffsetToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent before this date will be exported" />
+                    ToolTip="Only include messages sent before this date" />
                 <materialDesign:TimePicker
                     Grid.Row="1"
                     Grid.Column="0"
@@ -112,7 +113,7 @@
                     materialDesign:HintAssist.IsFloating="True"
                     IsEnabled="{Binding IsAfterDateSet}"
                     SelectedTime="{Binding AfterTime, Converter={x:Static converters:TimeSpanToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent after this time will be exported" />
+                    ToolTip="Only include messages sent after this time" />
                 <materialDesign:TimePicker
                     Grid.Row="1"
                     Grid.Column="1"
@@ -121,7 +122,7 @@
                     materialDesign:HintAssist.IsFloating="True"
                     IsEnabled="{Binding IsBeforeDateSet}"
                     SelectedTime="{Binding BeforeTime, Converter={x:Static converters:TimeSpanToDateTimeConverter.Instance}}"
-                    ToolTip="If this is set, only messages sent before this time will be exported" />
+                    ToolTip="Only include messages sent before this time" />
             </Grid>
 
             <!--  Partitioning  -->
@@ -130,10 +131,10 @@
                 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" />
@@ -142,7 +143,7 @@
                 <TextBlock
                     Grid.Column="0"
                     VerticalAlignment="Center"
-                    Text="Download referenced media content" />
+                    Text="Download media" />
                 <ToggleButton
                     Grid.Column="1"
                     HorizontalAlignment="Right"
@@ -163,18 +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

@@ -46,10 +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" />
@@ -124,8 +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"
@@ -136,12 +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  -->
@@ -151,25 +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">
@@ -177,41 +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>
@@ -226,7 +249,7 @@
                     <!--  Guilds  -->
                     <Border
                         Grid.Column="0"
-                        BorderBrush="{DynamicResource DividerBrush}"
+                        BorderBrush="{DynamicResource MaterialDesignDivider}"
                         BorderThickness="0,0,1,0">
                         <ListBox
                             ItemsSource="{Binding AvailableGuilds}"
@@ -245,13 +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>
@@ -284,8 +309,8 @@
                                                             Margin="0"
                                                             Padding="0"
                                                             Background="Transparent"
-                                                            BorderBrush="{DynamicResource DividerBrush}"
-                                                            BorderThickness="0,1,0,0"
+                                                            BorderBrush="{DynamicResource MaterialDesignDivider}"
+                                                            BorderThickness="0,0,0,1"
                                                             Header="{Binding Name}"
                                                             IsExpanded="False">
                                                             <ItemsPresenter />
@@ -322,7 +347,6 @@
                                             Margin="3,8,8,8"
                                             VerticalAlignment="Center"
                                             FontSize="14"
-                                            Foreground="{DynamicResource PrimaryTextBrush}"
                                             Text="{Binding Name, Mode=OneWay}" />
 
                                         <!--  Is selected checkmark  -->

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>2.22</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)