Update version

This reverts commit ee27167998.

.github/workflows/CD.yml

@@ -11,10 +11,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Install .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v1.4.0
       with:
         dotnet-version: 3.1.100
 
@@ -34,7 +34,7 @@ jobs:
 
     - name: Create release
       id: create_release
-      uses: actions/create-release@v1
+      uses: actions/create-release@v1.0.1
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
@@ -46,7 +46,7 @@ jobs:
         prerelease: false
 
     - name: Upload release asset (CLI)
-      uses: actions/upload-release-asset@v1.0.1
+      uses: actions/upload-release-asset@v1.0.2
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:
@@ -56,7 +56,7 @@ jobs:
         asset_content_type: application/zip
 
     - name: Upload release asset (GUI)
-      uses: actions/upload-release-asset@v1.0.1
+      uses: actions/upload-release-asset@v1.0.2
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       with:

.github/workflows/CI.yml

@@ -8,10 +8,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Install .NET Core
-      uses: actions/setup-dotnet@v1
+      uses: actions/setup-dotnet@v1.4.0
       with:
         dotnet-version: 3.1.100
 
@@ -22,13 +22,13 @@ jobs:
       run: dotnet publish DiscordChatExporter.Gui/ -o DiscordChatExporter.Gui/bin/Publish/ --configuration Release
 
     - name: Upload build artifacts (CLI)
-      uses: actions/upload-artifact@master
+      uses: actions/upload-artifact@v1
       with:
         name: DiscordChatExporter.CLI
         path: DiscordChatExporter.Cli/bin/Publish/
 
     - name: Upload build artifact (GUI)
-      uses: actions/upload-artifact@master
+      uses: actions/upload-artifact@v1
       with:
         name: DiscordChatExporter
         path: DiscordChatExporter.Gui/bin/Publish/

Changelog.md

@@ -1,3 +1,16 @@
+### v2.19 (26-Mar-2020)
+
+- Added parallel exporting. This option allows you to export multiple channels faster by doing it in parallel. You can configure the parallel limit in settings (GUI) or with the `--parallel` option (CLI). Default value is `1`, which means there is no parallelization. Warning: be careful when using this option, as this will result in higher volume of concurrent HTTP requests sent to Discord, which might get you flagged. Use at your own risk.
+- [HTML] Added support for user colors. User names are now appropriately colored according to the assigned guild roles.
+- [HTML] Added support for nicknames. User names are replaced with nicknames where it's applicable. It's still possible to see the full user name by hovering your mouse over the nickname.
+- [HTML] Improved styling for mentions to bring it more in line with how it looks in Discord.
+
+### v2.18 (04-Feb-2020)
+
+- Added JSON export format. It's a structured data format which is easy to parse. If you're using DiscordChatExporter to export chat logs for further ingestion by another tool, this is most likely the format you will want to use.
+- [GUI] You can now quickly jump to a specific channel in a list. For example, if you want to jump to a channel named "General", you can simply press the 'g' key in the channel list view. You can also press 'g', 'e' and 'n' in quick succession which will jump to the next channel that starts with "gen". This mechanic is consistent with other Windows applications.
+- [CLI] Improved help text screen.
+
 ### v2.17 (12-Jan-2020)
 
 - Fixed an issue where an empty file was produced when exporting a channel with no messages (for specified period). With the new behavior, no file will be created and instead a message will be shown to the user informing of the failure.

DiscordChatExporter.Cli/Commands/ExportChannelCommand.cs

@@ -1,6 +1,6 @@
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Services;
 
 namespace DiscordChatExporter.Cli.Commands
@@ -8,14 +8,14 @@ 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 string ChannelId { get; set; } = "";
 
         public ExportChannelCommand(SettingsService settingsService, DataService dataService, ExportService exportService)
             : base(settingsService, dataService, exportService)
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console) => await ExportAsync(console, ChannelId);
+        public override async ValueTask ExecuteAsync(IConsole console) => await ExportAsync(console, ChannelId);
     }
 }

DiscordChatExporter.Cli/Commands/ExportCommandBase.cs

@@ -1,8 +1,8 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using CliFx.Utilities;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
@@ -19,7 +19,7 @@ namespace DiscordChatExporter.Cli.Commands
         public ExportFormat ExportFormat { get; set; } = ExportFormat.HtmlDark;
 
         [CommandOption("output", 'o', Description = "Output file or directory path.")]
-        public string? OutputPath { get; set; }
+        public string OutputPath { get; set; } = Directory.GetCurrentDirectory();
 
         [CommandOption("after", Description = "Limit to messages sent after this date.")]
         public DateTimeOffset? After { get; set; }
@@ -40,7 +40,7 @@ namespace DiscordChatExporter.Cli.Commands
             ExportService = exportService;
         }
 
-        protected async Task ExportAsync(IConsole console, Guild guild, Channel channel)
+        protected async ValueTask ExportAsync(IConsole console, Guild guild, Channel channel)
         {
             if (!string.IsNullOrWhiteSpace(DateFormat))
                 SettingsService.DateFormat = DateFormat;
@@ -48,23 +48,23 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.Write($"Exporting channel [{channel.Name}]... ");
             var progress = console.CreateProgressTicker();
 
-            var outputPath = OutputPath ?? Directory.GetCurrentDirectory();
+            await ExportService.ExportChatLogAsync(Token, guild, channel,
-            await ExportService.ExportChatLogAsync(GetToken(), guild, channel,
+                OutputPath, ExportFormat, PartitionLimit,
-                outputPath, ExportFormat, PartitionLimit,
                 After, Before, progress);
 
             console.Output.WriteLine();
+            console.Output.WriteLine("Done.");
         }
 
-        protected async Task ExportAsync(IConsole console, Channel channel)
+        protected async ValueTask ExportAsync(IConsole console, Channel channel)
         {
-            var guild = await DataService.GetGuildAsync(GetToken(), channel.GuildId);
+            var guild = await DataService.GetGuildAsync(Token, channel.GuildId);
             await ExportAsync(console, guild, channel);
         }
 
-        protected async Task ExportAsync(IConsole console, string channelId)
+        protected async ValueTask ExportAsync(IConsole console, string channelId)
         {
-            var channel = await DataService.GetChannelAsync(GetToken(), channelId);
+            var channel = await DataService.GetChannelAsync(Token, channelId);
             await ExportAsync(console, channel);
         }
     }

DiscordChatExporter.Cli/Commands/ExportDirectMessagesCommand.cs

@@ -1,50 +1,25 @@
 using System.Linq;
-using System.Net;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
-using DiscordChatExporter.Core.Models.Exceptions;
 using DiscordChatExporter.Core.Services;
-using DiscordChatExporter.Core.Services.Exceptions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("exportdm", Description = "Export all direct message channels.")]
-    public class ExportDirectMessagesCommand : ExportCommandBase
+    public class ExportDirectMessagesCommand : ExportMultipleCommandBase
     {
         public ExportDirectMessagesCommand(SettingsService settingsService, DataService dataService, ExportService exportService)
             : base(settingsService, dataService, exportService)
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async ValueTask ExecuteAsync(IConsole console)
         {
-            // Get channels
+            var directMessageChannels = await DataService.GetDirectMessageChannelsAsync(Token);
-            var channels = await DataService.GetDirectMessageChannelsAsync(GetToken());
+            var channels = directMessageChannels.OrderBy(c => c.Name).ToArray();
 
-            // Order channels
+            await ExportMultipleAsync(console, channels);
-            channels = channels.OrderBy(c => c.Name).ToArray();
-
-            // Loop through channels
-            foreach (var channel in channels)
-            {
-                try
-                {
-                    await ExportAsync(console, channel);
-                }
-                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
-                {
-                    console.Error.WriteLine("You don't have access to this channel.");
-                }
-                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
-                {
-                    console.Error.WriteLine("This channel doesn't exist.");
-                }
-                catch (DomainException ex)
-                {
-                    console.Error.WriteLine(ex.Message);
-                }
-            }
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportGuildCommand.cs

@@ -1,54 +1,33 @@
 using System.Linq;
-using System.Net;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Models;
-using DiscordChatExporter.Core.Models.Exceptions;
 using DiscordChatExporter.Core.Services;
-using DiscordChatExporter.Core.Services.Exceptions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("exportguild", Description = "Export all channels within specified guild.")]
-    public class ExportGuildCommand : ExportCommandBase
+    public class ExportGuildCommand : ExportMultipleCommandBase
     {
         [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
-        public string GuildId { get; set; }
+        public string GuildId { get; set; } = "";
 
         public ExportGuildCommand(SettingsService settingsService, DataService dataService, ExportService exportService)
             : base(settingsService, dataService, exportService)
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async ValueTask ExecuteAsync(IConsole console)
         {
-            // Get channels
+            var guildChannels = await DataService.GetGuildChannelsAsync(Token, GuildId);
-            var channels = await DataService.GetGuildChannelsAsync(GetToken(), GuildId);
 
-            // Filter and order channels
+            var channels = guildChannels
-            channels = channels.Where(c => c.Type.IsExportable()).OrderBy(c => c.Name).ToArray();
+                .Where(c => c.Type.IsExportable())
+                .OrderBy(c => c.Name)
+                .ToArray();
 
-            // Loop through channels
+            await ExportMultipleAsync(console, channels);
-            foreach (var channel in channels)
-            {
-                try
-                {
-                    await ExportAsync(console, channel);
-                }
-                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
-                {
-                    console.Error.WriteLine("You don't have access to this channel.");
-                }
-                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
-                {
-                    console.Error.WriteLine("This channel doesn't exist.");
-                }
-                catch (DomainException ex)
-                {
-                    console.Error.WriteLine(ex.Message);
-                }
-            }
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportMultipleCommandBase.cs

@@ -0,0 +1,92 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Threading;
+using System.Threading.Tasks;
+using CliFx;
+using CliFx.Attributes;
+using CliFx.Utilities;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Models.Exceptions;
+using DiscordChatExporter.Core.Services;
+using DiscordChatExporter.Core.Services.Exceptions;
+using Gress;
+using Tyrrrz.Extensions;
+
+namespace DiscordChatExporter.Cli.Commands
+{
+    public abstract class ExportMultipleCommandBase : ExportCommandBase
+    {
+        [CommandOption("parallel", Description = "Export this number of separate channels in parallel.")]
+        public int ParallelLimit { get; set; } = 1;
+
+        protected ExportMultipleCommandBase(SettingsService settingsService, DataService dataService, ExportService exportService)
+            : base(settingsService, dataService, exportService)
+        {
+        }
+
+        protected async ValueTask ExportMultipleAsync(IConsole console, IReadOnlyList<Channel> channels)
+        {
+            // This uses a separate route from ExportCommandBase because the progress ticker is not thread-safe
+            // Ugly code ahead. Will need to refactor.
+
+            if (!string.IsNullOrWhiteSpace(DateFormat))
+                SettingsService.DateFormat = DateFormat;
+
+            // Progress
+            console.Output.Write($"Exporting {channels.Count} channels... ");
+            var ticker = console.CreateProgressTicker();
+
+            // TODO: refactor this after improving Gress
+            var progressManager = new ProgressManager();
+            progressManager.PropertyChanged += (sender, args) => ticker.Report(progressManager.Progress);
+
+            var operations = progressManager.CreateOperations(channels.Count);
+
+            // Export channels
+            using var semaphore = new SemaphoreSlim(ParallelLimit.ClampMin(1));
+
+            var errors = new List<string>();
+
+            await Task.WhenAll(channels.Select(async (channel, i) =>
+            {
+                var operation = operations[i];
+                await semaphore.WaitAsync();
+
+                var guild = await DataService.GetGuildAsync(Token, channel.GuildId);
+
+                try
+                {
+                    await ExportService.ExportChatLogAsync(Token, guild, channel,
+                        OutputPath, ExportFormat, PartitionLimit,
+                        After, Before, operation);
+                }
+                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
+                {
+                    errors.Add("You don't have access to this channel.");
+                }
+                catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
+                {
+                    errors.Add("This channel doesn't exist.");
+                }
+                catch (DomainException ex)
+                {
+                    errors.Add(ex.Message);
+                }
+                finally
+                {
+                    semaphore.Release();
+                    operation.Dispose();
+                }
+            }));
+
+            ticker.Report(1);
+            console.Output.WriteLine();
+
+            foreach (var error in errors)
+                console.Error.WriteLine(error);
+
+            console.Output.WriteLine("Done.");
+        }
+    }
+}

DiscordChatExporter.Cli/Commands/GetChannelsCommand.cs

@@ -1,7 +1,7 @@
 using System.Linq;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
 
@@ -11,22 +11,22 @@ namespace DiscordChatExporter.Cli.Commands
     public class GetChannelsCommand : TokenCommandBase
     {
         [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
-        public string GuildId { get; set; }
+        public string GuildId { get; set; } = "";
 
         public GetChannelsCommand(DataService dataService)
             : base(dataService)
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async ValueTask ExecuteAsync(IConsole console)
         {
-            // Get channels
+            var guildChannels = await DataService.GetGuildChannelsAsync(Token, GuildId);
-            var channels = await DataService.GetGuildChannelsAsync(GetToken(), GuildId);
 
-            // Filter and order channels
+            var channels = guildChannels
-            channels = channels.Where(c => c.Type.IsExportable()).OrderBy(c => c.Name).ToArray();
+                .Where(c => c.Type.IsExportable())
+                .OrderBy(c => c.Name)
+                .ToArray();
 
-            // Print result
             foreach (var channel in channels)
                 console.Output.WriteLine($"{channel.Id} | {channel.Name}");
         }

DiscordChatExporter.Cli/Commands/GetDirectMessageChannelsCommand.cs

@@ -1,7 +1,7 @@
 using System.Linq;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Services;
 
 namespace DiscordChatExporter.Cli.Commands
@@ -14,15 +14,11 @@ namespace DiscordChatExporter.Cli.Commands
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async ValueTask ExecuteAsync(IConsole console)
         {
-            // Get channels
+            var directMessageChannels = await DataService.GetDirectMessageChannelsAsync(Token);
-            var channels = await DataService.GetDirectMessageChannelsAsync(GetToken());
+            var channels = directMessageChannels.OrderBy(c => c.Name).ToArray();
 
-            // Order channels
-            channels = channels.OrderBy(c => c.Name).ToArray();
-
-            // Print result
             foreach (var channel in channels)
                 console.Output.WriteLine($"{channel.Id} | {channel.Name}");
         }

DiscordChatExporter.Cli/Commands/GetGuildsCommand.cs

@@ -1,7 +1,7 @@
 using System.Linq;
 using System.Threading.Tasks;
+using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Services;
 
 namespace DiscordChatExporter.Cli.Commands
@@ -14,16 +14,11 @@ namespace DiscordChatExporter.Cli.Commands
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async ValueTask ExecuteAsync(IConsole console)
         {
-            // Get guilds
+            var guilds = await DataService.GetUserGuildsAsync(Token);
-            var guilds = await DataService.GetUserGuildsAsync(GetToken());
 
-            // Order guilds
+            foreach (var guild in guilds.OrderBy(g => g.Name))
-            guilds = guilds.OrderBy(g => g.Name).ToArray();
-
-            // Print result
-            foreach (var guild in guilds)
                 console.Output.WriteLine($"{guild.Id} | {guild.Name}");
         }
     }

DiscordChatExporter.Cli/Commands/GuideCommand.cs

@@ -2,14 +2,13 @@
 using System.Threading.Tasks;
 using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("guide", Description = "Explains how to obtain token, guild or channel ID.")]
     public class GuideCommand : ICommand
     {
-        public Task ExecuteAsync(IConsole console)
+        public ValueTask ExecuteAsync(IConsole console)
         {
             console.WithForegroundColor(ConsoleColor.White, () => console.Output.WriteLine("To get user token:"));
             console.Output.WriteLine(" 1. Open Discord");
@@ -48,7 +47,7 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine("If you still have unanswered questions, check out the wiki:");
             console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki");
 
-            return Task.CompletedTask;
+            return default;
         }
     }
 }

DiscordChatExporter.Cli/Commands/TokenCommandBase.cs

@@ -1,7 +1,6 @@
 using System.Threading.Tasks;
 using CliFx;
 using CliFx.Attributes;
-using CliFx.Services;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
 
@@ -12,18 +11,18 @@ namespace DiscordChatExporter.Cli.Commands
         protected DataService DataService { get; }
 
         [CommandOption("token", 't', IsRequired = true, Description = "Authorization token.")]
-        public string TokenValue { get; set; }
+        public string TokenValue { get; set; } = "";
 
         [CommandOption("bot", 'b', Description = "Whether this authorization token belongs to a bot.")]
         public bool IsBotToken { get; set; }
 
+        protected AuthToken Token => new AuthToken(IsBotToken ? AuthTokenType.Bot : AuthTokenType.User, TokenValue);
+
         protected TokenCommandBase(DataService dataService)
         {
             DataService = dataService;
         }
 
-        protected AuthToken GetToken() => new AuthToken(IsBotToken ? AuthTokenType.Bot : AuthTokenType.User, TokenValue);
+        public abstract ValueTask ExecuteAsync(IConsole console);
-
-        public abstract Task ExecuteAsync(IConsole console);
     }
 }

DiscordChatExporter.Cli/DiscordChatExporter.Cli.csproj

@@ -7,8 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CliFx" Version="0.0.8" />
+    <PackageReference Include="CliFx" Version="1.0.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.0" />
+    <PackageReference Include="Gress" Version="1.1.1" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.1" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>
 

DiscordChatExporter.Cli/Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Drawing;
 using System.Threading.Tasks;
 using CliFx;
 using DiscordChatExporter.Cli.Commands;
@@ -30,13 +31,13 @@ namespace DiscordChatExporter.Cli
             return services.BuildServiceProvider();
         }
 
-        public static Task<int> Main(string[] args)
+        public static async Task<int> Main(string[] args)
         {
             var serviceProvider = ConfigureServices();
 
-            return new CliApplicationBuilder()
+            return await new CliApplicationBuilder()
                 .AddCommandsFromThisAssembly()
-                .UseCommandFactory(schema => (ICommand) serviceProvider.GetService(schema.Type))
+                .UseTypeActivator(serviceProvider.GetService)
                 .Build()
                 .RunAsync(args);
         }

DiscordChatExporter.Core.Models/ExportFormat.cs

@@ -5,6 +5,7 @@
         PlainText,
         HtmlDark,
         HtmlLight,
-        Csv
+        Csv,
+        Json
     }
 }

DiscordChatExporter.Core.Models/Extensions.cs

@@ -18,16 +18,18 @@ namespace DiscordChatExporter.Core.Models
                 ExportFormat.HtmlDark => "html",
                 ExportFormat.HtmlLight => "html",
                 ExportFormat.Csv => "csv",
+                ExportFormat.Json => "json",
                 _ => throw new ArgumentOutOfRangeException(nameof(format))
             };
 
         public static string GetDisplayName(this ExportFormat format) =>
             format switch
             {
-                ExportFormat.PlainText => "Plain Text",
+                ExportFormat.PlainText => "TXT",
                 ExportFormat.HtmlDark => "HTML (Dark)",
                 ExportFormat.HtmlLight => "HTML (Light)",
-                ExportFormat.Csv => "Comma Separated Values (CSV)",
+                ExportFormat.Csv => "CSV",
+                ExportFormat.Json => "JSON",
                 _ => throw new ArgumentOutOfRangeException(nameof(format))
             };
     }

DiscordChatExporter.Core.Models/Guild.cs

@@ -1,6 +1,11 @@
-namespace DiscordChatExporter.Core.Models
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+
+namespace DiscordChatExporter.Core.Models
 {
-    // https://discordapp.string.IsNullOrWhiteSpace(com/developers/docs/resources/guild#guild-object
+    // https://discordapp.com/developers/docs/resources/guild#guild-object
 
     public partial class Guild : IHasId
     {
@@ -10,13 +15,19 @@
 
         public string? IconHash { get; }
 
+        public IReadOnlyList<Role> Roles { get; }
+
+        public Dictionary<string, Member?> Members { get; }
+
         public string IconUrl { get; }
 
-        public Guild(string id, string name, string? iconHash)
+        public Guild(string id, string name, IReadOnlyList<Role> roles, string? iconHash)
         {
             Id = id;
             Name = name;
             IconHash = iconHash;
+            Roles = roles;
+            Members = new Dictionary<string, Member?>();
 
             IconUrl = GetIconUrl(id, iconHash);
         }
@@ -26,13 +37,23 @@
 
     public partial class Guild
     {
-        public static string GetIconUrl(string id, string? iconHash)
+        public static string GetUserColor(Guild guild, User user) =>
-        {
+            guild.Members.GetValueOrDefault(user.Id, null)
-            return !string.IsNullOrWhiteSpace(iconHash)
+                ?.Roles
+                .Select(r => guild.Roles.FirstOrDefault(role => r == role.Id))
+                .Where(r => r != null)
+                .Where(r => r.Color != Color.Black)
+                .Where(r => r.Color.R + r.Color.G + r.Color.B > 0)
+                .Aggregate<Role, Role?>(null, (a, b) => (a?.Position ?? 0) > b.Position ? a : b)
+                ?.ColorAsHex ?? "";
+
+        public static string GetUserNick(Guild guild, User user) => guild.Members.GetValueOrDefault(user.Id)?.Nick ?? user.Name;
+
+        public static string GetIconUrl(string id, string? iconHash) =>
+            !string.IsNullOrWhiteSpace(iconHash)
                 ? $"https://cdn.discordapp.com/icons/{id}/{iconHash}.png"
                 : "https://cdn.discordapp.com/embed/avatars/0.png";
-        }
 
-        public static Guild DirectMessages { get; } = new Guild("@me", "Direct Messages", null);
+        public static Guild DirectMessages { get; } = new Guild("@me", "Direct Messages", Array.Empty<Role>(), null);
     }
 }

DiscordChatExporter.Core.Models/Member.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace DiscordChatExporter.Core.Models
+{
+    // https://discordapp.com/developers/docs/resources/guild#guild-member-object
+
+    public class Member
+    {
+        public string UserId { get; }
+
+        public string? Nick { get; }
+
+        public IReadOnlyList<string> Roles { get; }
+
+        public Member(string userId, string? nick, IReadOnlyList<string> roles)
+        {
+            UserId = userId;
+            Nick = nick;
+            Roles = roles;
+        }
+    }
+}

DiscordChatExporter.Core.Models/Role.cs

@@ -1,4 +1,6 @@
-namespace DiscordChatExporter.Core.Models
+using System.Drawing;
+
+namespace DiscordChatExporter.Core.Models
 {
     // https://discordapp.com/developers/docs/topics/permissions#role-object
 
@@ -8,10 +10,20 @@
 
         public string Name { get; }
 
-        public Role(string id, string name)
+        public Color Color { get; }
+
+        public string ColorAsHex => $"#{Color.ToArgb() & 0xffffff:X6}";
+
+        public string ColorAsRgb => $"{Color.R}, {Color.G}, {Color.B}";
+
+        public int Position { get; }
+
+        public Role(string id, string name, Color color, int position)
         {
             Id = id;
             Name = name;
+            Color = color;
+            Position = position;
         }
 
         public override string ToString() => Name;
@@ -19,6 +31,6 @@
 
     public partial class Role
     {
-        public static Role CreateDeletedRole(string id) => new Role(id, "deleted-role");
+        public static Role CreateDeletedRole(string id) => new Role(id, "deleted-role", Color.Black, -1);
     }
 }

DiscordChatExporter.Core.Rendering/Formatters/CsvMessageWriter.cs

@@ -7,19 +7,28 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 {
     public class CsvMessageWriter : MessageWriterBase
     {
-        public CsvMessageWriter(TextWriter writer, RenderContext context)
+        private readonly TextWriter _writer;
-            : base(writer, context)
+
+        public CsvMessageWriter(Stream stream, RenderContext context)
+            : base(stream, context)
         {
+            _writer = new StreamWriter(stream);
         }
 
         public override async Task WritePreambleAsync()
         {
-            await Writer.WriteLineAsync(CsvRenderingLogic.FormatHeader(Context));
+            await _writer.WriteLineAsync(CsvRenderingLogic.FormatHeader(Context));
         }
 
         public override async Task WriteMessageAsync(Message message)
         {
-            await Writer.WriteLineAsync(CsvRenderingLogic.FormatMessage(Context, message));
+            await _writer.WriteLineAsync(CsvRenderingLogic.FormatMessage(Context, message));
+        }
+
+        public override async ValueTask DisposeAsync()
+        {
+            await _writer.DisposeAsync();
+            await base.DisposeAsync();
         }
     }
 }

DiscordChatExporter.Core.Rendering/Formatters/HtmlMessageWriter.cs

@@ -14,6 +14,7 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 {
     public partial class HtmlMessageWriter : MessageWriterBase
     {
+        private readonly TextWriter _writer;
         private readonly string _themeName;
         private readonly List<Message> _messageGroupBuffer = new List<Message>();
 
@@ -23,9 +24,10 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 
         private long _messageCount;
 
-        public HtmlMessageWriter(TextWriter writer, RenderContext context, string themeName)
+        public HtmlMessageWriter(Stream stream, RenderContext context, string themeName)
-            : base(writer, context)
+            : base(stream, context)
         {
+            _writer = new StreamWriter(stream);
             _themeName = themeName;
 
             _preambleTemplate = Template.Parse(GetPreambleTemplateCode());
@@ -73,11 +75,15 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
             scriptObject.Import("FormatMarkdown",
                 new Func<string, string>(m => HtmlRenderingLogic.FormatMarkdown(Context, m)));
 
+            scriptObject.Import("GetUserColor", new Func<Guild, User, string>(Guild.GetUserColor));
+            
+            scriptObject.Import("GetUserNick", new Func<Guild, User, string>(Guild.GetUserNick));
+
             // Push model
             templateContext.PushGlobal(scriptObject);
 
             // Push output
-            templateContext.PushOutput(new TextWriterOutput(Writer));
+            templateContext.PushOutput(new TextWriterOutput(_writer));
 
             return templateContext;
         }
@@ -131,6 +137,12 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 
             await templateContext.EvaluateAsync(_postambleTemplate.Page);
         }
+
+        public override async ValueTask DisposeAsync()
+        {
+            await _writer.DisposeAsync();
+            await base.DisposeAsync();
+        }
     }
 
     public partial class HtmlMessageWriter

DiscordChatExporter.Core.Rendering/Formatters/JsonMessageWriter.cs

@@ -0,0 +1,222 @@
+using System.IO;
+using System.Text.Json;
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Rendering.Internal;
+using DiscordChatExporter.Core.Rendering.Logic;
+
+namespace DiscordChatExporter.Core.Rendering.Formatters
+{
+    public class JsonMessageWriter : MessageWriterBase
+    {
+        private readonly Utf8JsonWriter _writer;
+
+        private long _messageCount;
+
+        public JsonMessageWriter(Stream stream, RenderContext context)
+            : base(stream, context)
+        {
+            _writer = new Utf8JsonWriter(stream, new JsonWriterOptions
+            {
+                Indented = true
+            });
+        }
+
+        public override async Task WritePreambleAsync()
+        {
+            // Root object (start)
+            _writer.WriteStartObject();
+
+            // Guild
+            _writer.WriteStartObject("guild");
+            _writer.WriteString("id", Context.Guild.Id);
+            _writer.WriteString("name", Context.Guild.Name);
+            _writer.WriteString("iconUrl", Context.Guild.IconUrl);
+            _writer.WriteEndObject();
+
+            // Channel
+            _writer.WriteStartObject("channel");
+            _writer.WriteString("id", Context.Channel.Id);
+            _writer.WriteString("type", Context.Channel.Type.ToString());
+            _writer.WriteString("name", Context.Channel.Name);
+            _writer.WriteString("topic", Context.Channel.Topic);
+            _writer.WriteEndObject();
+
+            // Date range
+            _writer.WriteStartObject("dateRange");
+            _writer.WriteString("after", Context.After);
+            _writer.WriteString("before", Context.Before);
+            _writer.WriteEndObject();
+
+            // Message array (start)
+            _writer.WriteStartArray("messages");
+
+            await _writer.FlushAsync();
+        }
+
+        public override async Task WriteMessageAsync(Message message)
+        {
+            _writer.WriteStartObject();
+
+            // Metadata
+            _writer.WriteString("id", message.Id);
+            _writer.WriteString("type", message.Type.ToString());
+            _writer.WriteString("timestamp", message.Timestamp);
+            _writer.WriteString("timestampEdited", message.EditedTimestamp);
+            _writer.WriteBoolean("isPinned", message.IsPinned);
+
+            // Content
+            var content = PlainTextRenderingLogic.FormatMessageContent(Context, message);
+            _writer.WriteString("content", content);
+
+            // Author
+            _writer.WriteStartObject("author");
+            _writer.WriteString("id", message.Author.Id);
+            _writer.WriteString("name", message.Author.Name);
+            _writer.WriteString("discriminator", $"{message.Author.Discriminator:0000}");
+            _writer.WriteBoolean("isBot", message.Author.IsBot);
+            _writer.WriteString("avatarUrl", message.Author.AvatarUrl);
+            _writer.WriteEndObject();
+
+            // Attachments
+            _writer.WriteStartArray("attachments");
+
+            foreach (var attachment in message.Attachments)
+            {
+                _writer.WriteStartObject();
+
+                _writer.WriteString("id", attachment.Id);
+                _writer.WriteString("url", attachment.Url);
+                _writer.WriteString("fileName", attachment.FileName);
+                _writer.WriteNumber("fileSizeBytes", (long) attachment.FileSize.Bytes);
+
+                _writer.WriteEndObject();
+            }
+
+            _writer.WriteEndArray();
+
+            // Embeds
+            _writer.WriteStartArray("embeds");
+
+            foreach (var embed in message.Embeds)
+            {
+                _writer.WriteStartObject();
+
+                _writer.WriteString("title", embed.Title);
+                _writer.WriteString("url", embed.Url);
+                _writer.WriteString("timestamp", embed.Timestamp);
+                _writer.WriteString("description", embed.Description);
+
+                // Author
+                if (embed.Author != null)
+                {
+                    _writer.WriteStartObject("author");
+                    _writer.WriteString("name", embed.Author.Name);
+                    _writer.WriteString("url", embed.Author.Url);
+                    _writer.WriteString("iconUrl", embed.Author.IconUrl);
+                    _writer.WriteEndObject();
+                }
+
+                // Thumbnail
+                if (embed.Thumbnail != null)
+                {
+                    _writer.WriteStartObject("thumbnail");
+                    _writer.WriteString("url", embed.Thumbnail.Url);
+                    _writer.WriteNumber("width", embed.Thumbnail.Width);
+                    _writer.WriteNumber("height", embed.Thumbnail.Height);
+                    _writer.WriteEndObject();
+                }
+
+                // Image
+                if (embed.Image != null)
+                {
+                    _writer.WriteStartObject("image");
+                    _writer.WriteString("url", embed.Image.Url);
+                    _writer.WriteNumber("width", embed.Image.Width);
+                    _writer.WriteNumber("height", embed.Image.Height);
+                    _writer.WriteEndObject();
+                }
+
+                // Footer
+                if (embed.Footer != null)
+                {
+                    _writer.WriteStartObject("footer");
+                    _writer.WriteString("text", embed.Footer.Text);
+                    _writer.WriteString("iconUrl", embed.Footer.IconUrl);
+                    _writer.WriteEndObject();
+                }
+
+                // Fields
+                _writer.WriteStartArray("fields");
+
+                foreach (var field in embed.Fields)
+                {
+                    _writer.WriteStartObject();
+
+                    _writer.WriteString("name", field.Name);
+                    _writer.WriteString("value", field.Value);
+                    _writer.WriteBoolean("isInline", field.IsInline);
+
+                    _writer.WriteEndObject();
+                }
+
+                _writer.WriteEndArray();
+
+                _writer.WriteEndObject();
+            }
+
+            _writer.WriteEndArray();
+
+            // Reactions
+            _writer.WriteStartArray("reactions");
+
+            foreach (var reaction in message.Reactions)
+            {
+                _writer.WriteStartObject();
+
+                // Emoji
+                _writer.WriteStartObject("emoji");
+                _writer.WriteString("id", reaction.Emoji.Id);
+                _writer.WriteString("name", reaction.Emoji.Name);
+                _writer.WriteBoolean("isAnimated", reaction.Emoji.IsAnimated);
+                _writer.WriteString("imageUrl", reaction.Emoji.ImageUrl);
+                _writer.WriteEndObject();
+
+                // Count
+                _writer.WriteNumber("count", reaction.Count);
+
+                _writer.WriteEndObject();
+            }
+
+            _writer.WriteEndArray();
+
+            _writer.WriteEndObject();
+
+            _messageCount++;
+
+            // Flush every 100 messages
+            if (_messageCount % 100 == 0)
+                await _writer.FlushAsync();
+        }
+
+        public override async Task WritePostambleAsync()
+        {
+            // Message array (end)
+            _writer.WriteEndArray();
+
+            // Message count
+            _writer.WriteNumber("messageCount", _messageCount);
+
+            // Root object (end)
+            _writer.WriteEndObject();
+
+            await _writer.FlushAsync();
+        }
+
+        public override async ValueTask DisposeAsync()
+        {
+            await _writer.DisposeAsync();
+            await base.DisposeAsync();
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/Formatters/MessageWriterBase.cs

@@ -7,13 +7,13 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 {
     public abstract class MessageWriterBase : IAsyncDisposable
     {
-        protected TextWriter Writer { get; }
+        protected Stream Stream { get; }
 
         protected RenderContext Context { get; }
 
-        protected MessageWriterBase(TextWriter writer, RenderContext context)
+        protected MessageWriterBase(Stream stream, RenderContext context)
         {
-            Writer = writer;
+            Stream = stream;
             Context = context;
         }
 
@@ -23,6 +23,6 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 
         public virtual Task WritePostambleAsync() => Task.CompletedTask;
 
-        public async ValueTask DisposeAsync() => await Writer.DisposeAsync();
+        public virtual async ValueTask DisposeAsync() => await Stream.DisposeAsync();
     }
 }

DiscordChatExporter.Core.Rendering/Formatters/PlainTextMessageWriter.cs

@@ -7,30 +7,39 @@ namespace DiscordChatExporter.Core.Rendering.Formatters
 {
     public class PlainTextMessageWriter : MessageWriterBase
     {
+        private readonly TextWriter _writer;
+
         private long _messageCount;
 
-        public PlainTextMessageWriter(TextWriter writer, RenderContext context)
+        public PlainTextMessageWriter(Stream stream, RenderContext context)
-            : base(writer, context)
+            : base(stream, context)
         {
+            _writer = new StreamWriter(stream);
         }
 
         public override async Task WritePreambleAsync()
         {
-            await Writer.WriteLineAsync(PlainTextRenderingLogic.FormatPreamble(Context));
+            await _writer.WriteLineAsync(PlainTextRenderingLogic.FormatPreamble(Context));
         }
 
         public override async Task WriteMessageAsync(Message message)
         {
-            await Writer.WriteLineAsync(PlainTextRenderingLogic.FormatMessage(Context, message));
+            await _writer.WriteLineAsync(PlainTextRenderingLogic.FormatMessage(Context, message));
-            await Writer.WriteLineAsync();
+            await _writer.WriteLineAsync();
 
             _messageCount++;
         }
 
         public override async Task WritePostambleAsync()
         {
-            await Writer.WriteLineAsync();
+            await _writer.WriteLineAsync();
-            await Writer.WriteLineAsync(PlainTextRenderingLogic.FormatPostamble(_messageCount));
+            await _writer.WriteLineAsync(PlainTextRenderingLogic.FormatPostamble(_messageCount));
+        }
+
+        public override async ValueTask DisposeAsync()
+        {
+            await _writer.DisposeAsync();
+            await base.DisposeAsync();
         }
     }
 }

DiscordChatExporter.Core.Rendering/Internal/Extensions.cs

@@ -1,4 +1,6 @@
-using System.Text;
+using System;
+using System.Text;
+using System.Text.Json;
 
 namespace DiscordChatExporter.Core.Rendering.Internal
 {
@@ -17,5 +19,25 @@ namespace DiscordChatExporter.Core.Rendering.Internal
 
             return builder;
         }
+
+        public static void WriteString(this Utf8JsonWriter writer, string propertyName, DateTimeOffset? value)
+        {
+            writer.WritePropertyName(propertyName);
+
+            if (value != null)
+                writer.WriteStringValue(value.Value);
+            else
+                writer.WriteNullValue();
+        }
+
+        public static void WriteNumber(this Utf8JsonWriter writer, string propertyName, int? value)
+        {
+            writer.WritePropertyName(propertyName);
+
+            if (value != null)
+                writer.WriteNumberValue(value.Value);
+            else
+                writer.WriteNullValue();
+        }
     }
 }

DiscordChatExporter.Core.Rendering/Logic/HtmlRenderingLogic.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Linq;
 using System.Net;
 using System.Text.RegularExpressions;
@@ -97,7 +98,9 @@ namespace DiscordChatExporter.Core.Rendering.Logic
                     var user = context.MentionableUsers.FirstOrDefault(u => u.Id == mentionNode.Id) ??
                                User.CreateUnknownUser(mentionNode.Id);
 
-                    return $"<span class=\"mention\" title=\"{HtmlEncode(user.FullName)}\">@{HtmlEncode(user.Name)}</span>";
+                    var nick = Guild.GetUserNick(context.Guild, user);
+
+                    return $"<span class=\"mention\" title=\"{HtmlEncode(user.FullName)}\">@{HtmlEncode(nick)}</span>";
                 }
 
                 // Channel mention node
@@ -114,8 +117,11 @@ namespace DiscordChatExporter.Core.Rendering.Logic
                 {
                     var role = context.MentionableRoles.FirstOrDefault(r => r.Id == mentionNode.Id) ??
                                Role.CreateDeletedRole(mentionNode.Id);
+                    string style = "";
+                    if (role.Color != Color.Black)
+                        style = $"style=\"color: {role.ColorAsHex}; background-color: rgba({role.ColorAsRgb}, 0.1); font-weight: 400;\"";
 
-                    return $"<span class=\"mention\">@{HtmlEncode(role.Name)}</span>";
+                    return $"<span class=\"mention\" {style}>@{HtmlEncode(role.Name)}</span>";
                 }
             }
 
@@ -128,7 +134,8 @@ namespace DiscordChatExporter.Core.Rendering.Logic
                 // Make emoji large if it's jumbo
                 var jumboableCssClass = isJumbo ? "emoji--large" : null;
 
-                return $"<img class=\"emoji {jumboableCssClass}\" alt=\"{emojiNode.Name}\" title=\"{emojiNode.Name}\" src=\"{emojiImageUrl}\" />";
+                return
+                    $"<img class=\"emoji {jumboableCssClass}\" alt=\"{emojiNode.Name}\" title=\"{emojiNode.Name}\" src=\"{emojiImageUrl}\" />";
             }
 
             // Link node

DiscordChatExporter.Core.Rendering/MessageRenderer.cs

@@ -99,21 +99,24 @@ namespace DiscordChatExporter.Core.Rendering
 
         private static MessageWriterBase CreateMessageWriter(string filePath, ExportFormat format, RenderContext context)
         {
-            // Create inner writer (it will get disposed by the wrapper)
+            // Create a stream (it will get disposed by the writer)
-            var writer = File.CreateText(filePath);
+            var stream = File.Create(filePath);
 
             // Create formatter
             if (format == ExportFormat.PlainText)
-                return new PlainTextMessageWriter(writer, context);
+                return new PlainTextMessageWriter(stream, context);
 
             if (format == ExportFormat.Csv)
-                return new CsvMessageWriter(writer, context);
+                return new CsvMessageWriter(stream, context);
 
             if (format == ExportFormat.HtmlDark)
-                return new HtmlMessageWriter(writer, context, "Dark");
+                return new HtmlMessageWriter(stream, context, "Dark");
 
             if (format == ExportFormat.HtmlLight)
-                return new HtmlMessageWriter(writer, context, "Light");
+                return new HtmlMessageWriter(stream, context, "Light");
+
+            if (format == ExportFormat.Json)
+                return new JsonMessageWriter(stream, context);
 
             throw new InvalidOperationException($"Unknown export format [{format}].");
         }

DiscordChatExporter.Core.Rendering/Resources/HtmlCore.css

@@ -82,6 +82,10 @@ img {
 }
 
 .mention {
+    border-radius: 3px;
+    padding: 0 2px;
+    color: #7289da;
+    background: rgba(114, 137, 218, .1);
     font-weight: 500;
 }
 

DiscordChatExporter.Core.Rendering/Resources/HtmlDark.css

@@ -26,10 +26,6 @@ a {
     color: #b9bbbe !important;
 }
 
-.mention {
-    color: #7289da;
-}
-
 /* === Preamble === */
 
 .preamble__entry {

DiscordChatExporter.Core.Rendering/Resources/HtmlLight.css

@@ -27,11 +27,6 @@ a {
     color: #657b83 !important;
 }
 
-.mention {
-    background-color: #f1f3fb;
-    color: #7289da;
-}
-
 /* Preamble */
 
 .preamble__entry {

DiscordChatExporter.Core.Rendering/Resources/HtmlMessageGroupTemplate.html

@@ -5,7 +5,7 @@
     </div>
     <div class="chatlog__messages">
         {{~ # Author name and timestamp ~}}
-        <span class="chatlog__author-name" title="{{ MessageGroup.Author.FullName | html.escape }}" data-user-id="{{ MessageGroup.Author.Id | html.escape }}">{{ MessageGroup.Author.Name | html.escape }}</span>
+    <span class="chatlog__author-name" title="{{ MessageGroup.Author.FullName | html.escape }}" data-user-id="{{ MessageGroup.Author.Id | html.escape }}" style="color: {{ GetUserColor Context.Guild MessageGroup.Author }}">{{ GetUserNick Context.Guild MessageGroup.Author | html.escape }}</span>
 
         {{~ # Bot tag ~}}
         {{~ if MessageGroup.Author.IsBot ~}}

DiscordChatExporter.Core.Services/DataService.Parsers.cs

@@ -21,13 +21,23 @@ namespace DiscordChatExporter.Core.Services
             return new User(id, discriminator, name, avatarHash, isBot);
         }
 
+        private Member ParseMember(JToken json)
+        {
+            var userId = ParseUser(json["user"]!).Id;
+            var nick = json["nick"]?.Value<string>();
+            var roles = (json["roles"] ?? Enumerable.Empty<JToken>()).Select(j => j.Value<string>()).ToArray();
+
+            return new Member(userId, nick, roles);
+        }
+
         private Guild ParseGuild(JToken json)
         {
             var id = json["id"]!.Value<string>();
             var name = json["name"]!.Value<string>();
             var iconHash = json["icon"]!.Value<string>();
+            var roles = (json["roles"] ?? Enumerable.Empty<JToken>()).Select(ParseRole).ToArray();
 
-            return new Guild(id, name, iconHash);
+            return new Guild(id, name, roles, iconHash);
         }
 
         private Channel ParseChannel(JToken json)
@@ -64,8 +74,10 @@ namespace DiscordChatExporter.Core.Services
         {
             var id = json["id"]!.Value<string>();
             var name = json["name"]!.Value<string>();
+            var color = json["color"]!.Value<int>();
+            var position = json["position"]!.Value<int>();
 
-            return new Role(id, name);
+            return new Role(id, name, Color.FromArgb(color), position);
         }
 
         private Attachment ParseAttachment(JToken json)

DiscordChatExporter.Core.Services/DataService.cs

@@ -42,6 +42,11 @@ namespace DiscordChatExporter.Core.Services
         }
 
         private async Task<JToken> GetApiResponseAsync(AuthToken token, string route)
+        {
+            return (await GetApiResponseAsync(token, route, true))!;
+        }
+
+        private async Task<JToken?> GetApiResponseAsync(AuthToken token, string route, bool errorOnFail)
         {
             using var response = await _httpPolicy.ExecuteAsync(async () =>
             {
@@ -56,7 +61,10 @@ namespace DiscordChatExporter.Core.Services
 
             // We throw our own exception here because default one doesn't have status code
             if (!response.IsSuccessStatusCode)
-                throw new HttpErrorStatusCodeException(response.StatusCode, response.ReasonPhrase);
+            {
+                if (errorOnFail) throw new HttpErrorStatusCodeException(response.StatusCode, response.ReasonPhrase);
+                else return null;
+            }
 
             var jsonRaw = await response.Content.ReadAsStringAsync();
             return JToken.Parse(jsonRaw);
@@ -74,6 +82,15 @@ namespace DiscordChatExporter.Core.Services
             return guild;
         }
 
+        public async Task<Member?> GetGuildMemberAsync(AuthToken token, string guildId, string userId)
+        {
+            var response = await GetApiResponseAsync(token, $"guilds/{guildId}/members/{userId}", false);
+            if (response == null) return null;
+            var member = ParseMember(response);
+
+            return member;
+        }
+
         public async Task<Channel> GetChannelAsync(AuthToken token, string channelId)
         {
             var response = await GetApiResponseAsync(token, $"channels/{channelId}");
@@ -97,10 +114,11 @@ namespace DiscordChatExporter.Core.Services
                 if (!response.HasValues)
                     yield break;
 
-                foreach (var guild in response.Select(ParseGuild))
+                // Get full guild object
+                foreach (var guildId in response.Select(j => j["id"]!.Value<string>()))
                 {
-                    yield return guild;
+                    yield return await GetGuildAsync(token, guildId);
-                    afterId = guild.Id;
+                    afterId = guildId;
                 }
             }
         }
@@ -125,18 +143,6 @@ namespace DiscordChatExporter.Core.Services
             return channels;
         }
 
-        public async Task<IReadOnlyList<Role>> GetGuildRolesAsync(AuthToken token, string guildId)
-        {
-            // Special case for direct messages pseudo-guild
-            if (guildId == Guild.DirectMessages.Id)
-                return Array.Empty<Role>();
-
-            var response = await GetApiResponseAsync(token, $"guilds/{guildId}/roles");
-            var roles = response.Select(ParseRole).ToArray();
-
-            return roles;
-        }
-
         private async Task<Message> GetLastMessageAsync(AuthToken token, string channelId, DateTimeOffset? before = null)
         {
             var route = $"channels/{channelId}/messages?limit=1";

DiscordChatExporter.Core.Services/ExportService.cs

@@ -34,7 +34,7 @@ namespace DiscordChatExporter.Core.Services
             // Create context
             var mentionableUsers = new HashSet<User>(IdBasedEqualityComparer.Instance);
             var mentionableChannels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
-            var mentionableRoles = await _dataService.GetGuildRolesAsync(token, guild.Id);
+            var mentionableRoles = guild.Roles;
 
             var context = new RenderContext
             (
@@ -50,8 +50,21 @@ namespace DiscordChatExporter.Core.Services
             await foreach (var message in _dataService.GetMessagesAsync(token, channel.Id, after, before, progress))
             {
                 // Add encountered users to the list of mentionable users
-                mentionableUsers.Add(message.Author);
+                var encounteredUsers = new List<User>();
-                mentionableUsers.AddRange(message.MentionedUsers);
+                encounteredUsers.Add(message.Author);
+                encounteredUsers.AddRange(message.MentionedUsers);
+
+                mentionableUsers.AddRange(encounteredUsers);
+
+                foreach (User u in encounteredUsers)
+                {
+                    if(!guild.Members.ContainsKey(u.Id))
+                    {
+                        var member = await _dataService.GetGuildMemberAsync(token, guild.Id, u.Id);
+                        guild.Members[u.Id] = member;
+                    }
+                }
+
 
                 // Render message
                 await renderer.RenderMessageAsync(message);

DiscordChatExporter.Core.Services/SettingsService.cs

@@ -11,6 +11,8 @@ namespace DiscordChatExporter.Core.Services
 
         public bool IsTokenPersisted { get; set; } = true;
 
+        public int ParallelLimit { get; set; } = 1;
+
         public AuthToken? LastToken { get; set; }
 
         public ExportFormat LastExportFormat { get; set; } = ExportFormat.HtmlDark;

DiscordChatExporter.Gui/DiscordChatExporter.Gui.csproj

@@ -16,11 +16,11 @@
     <PackageReference Include="Gress" Version="1.1.1" />
     <PackageReference Include="MaterialDesignColors" Version="1.2.2" />
     <PackageReference Include="MaterialDesignThemes" Version="3.0.1" />
-    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.3" />
+    <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.19" />
     <PackageReference Include="Ookii.Dialogs.Wpf" Version="1.1.0" />
     <PackageReference Include="Stylet" Version="1.3.0" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
-    <PackageReference Include="PropertyChanged.Fody" Version="3.2.3" PrivateAssets="all" />
+    <PackageReference Include="PropertyChanged.Fody" Version="3.2.5" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>
@@ -32,7 +32,7 @@
 
   <Target Name="Format XAML" AfterTargets="BeforeBuild">
     <Exec Command="dotnet tool restore" />
-    <Exec Command="dotnet xstyler -r -d &quot;$(MSBuildProjectDirectory)&quot;" />
+    <Exec Command="dotnet xstyler -r -d ." />
   </Target>
 
 </Project>

DiscordChatExporter.Gui/ViewModels/Components/ChannelViewModel.cs

@@ -5,13 +5,13 @@ namespace DiscordChatExporter.Gui.ViewModels.Components
 {
     public partial class ChannelViewModel : PropertyChangedBase
     {
-        public Channel Model { get; set; }
+        public Channel? Model { get; set; }
 
         public string? Category { get; set; }
     }
 
     public partial class ChannelViewModel
     {
-        public static implicit operator Channel(ChannelViewModel viewModel) => viewModel.Model;
+        public static implicit operator Channel?(ChannelViewModel? viewModel) => viewModel?.Model;
     }
 }

DiscordChatExporter.Gui/ViewModels/Components/GuildViewModel.cs

@@ -6,13 +6,13 @@ namespace DiscordChatExporter.Gui.ViewModels.Components
 {
     public partial class GuildViewModel : PropertyChangedBase
     {
-        public Guild Model { get; set; }
+        public Guild? Model { get; set; }
 
-        public IReadOnlyList<ChannelViewModel> Channels { get; set; }
+        public IReadOnlyList<ChannelViewModel>? Channels { get; set; }
     }
 
     public partial class GuildViewModel
     {
-        public static implicit operator Guild(GuildViewModel viewModel) => viewModel.Model;
+        public static implicit operator Guild?(GuildViewModel? viewModel) => viewModel?.Model;
     }
 }

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -14,11 +14,11 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
         private readonly DialogManager _dialogManager;
         private readonly SettingsService _settingsService;
 
-        public GuildViewModel Guild { get; set; }
+        public GuildViewModel? Guild { get; set; }
 
-        public IReadOnlyList<ChannelViewModel> Channels { get; set; }
+        public IReadOnlyList<ChannelViewModel>? Channels { get; set; }
 
-        public bool IsSingleChannel => Channels.Count == 1;
+        public bool IsSingleChannel => Channels == null || Channels.Count == 1;
 
         public string? OutputPath { get; set; }
 
@@ -62,7 +62,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
                 var channel = Channels.Single();
 
                 // Generate default file name
-                var defaultFileName = ExportLogic.GetDefaultExportFileName(SelectedFormat, Guild, channel, After, Before);
+                var defaultFileName = ExportLogic.GetDefaultExportFileName(SelectedFormat, Guild!, channel!, After, Before);
 
                 // Generate filter
                 var ext = SelectedFormat.GetFileExtension();

DiscordChatExporter.Gui/ViewModels/Dialogs/SettingsViewModel.cs

@@ -1,5 +1,6 @@
 using DiscordChatExporter.Core.Services;
 using DiscordChatExporter.Gui.ViewModels.Framework;
+using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 {
@@ -25,6 +26,12 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
             set => _settingsService.IsTokenPersisted = value;
         }
 
+        public int ParallelLimit
+        {
+            get => _settingsService.ParallelLimit;
+            set => _settingsService.ParallelLimit = value.Clamp(1, 10);
+        }
+
         public SettingsViewModel(SettingsService settingsService)
         {
             _settingsService = settingsService;

DiscordChatExporter.Gui/ViewModels/Framework/DialogScreen.cs

@@ -5,7 +5,8 @@ namespace DiscordChatExporter.Gui.ViewModels.Framework
 {
     public abstract class DialogScreen<T> : PropertyChangedBase
     {
-        public T DialogResult { get; private set; }
+        // ReSharper disable once RedundantDefaultMemberInitializer
+        public T DialogResult { get; private set; } = default!;
 
         public event EventHandler? Closed;
 

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Threading;
 using System.Threading.Tasks;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Models.Exceptions;
@@ -178,7 +179,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                     // Create guild view model
                     var guildViewModel = _viewModelFactory.CreateGuildViewModel(guild,
                         channelViewModels.OrderBy(c => c.Category)
-                            .ThenBy(c => c.Model.Name)
+                            .ThenBy(c => c.Model!.Name)
                             .ToArray());
 
                     // Add to list
@@ -210,7 +211,7 @@ namespace DiscordChatExporter.Gui.ViewModels
                     // Create guild view model
                     var guildViewModel = _viewModelFactory.CreateGuildViewModel(guild,
                         channelViewModels.OrderBy(c => c.Category)
-                            .ThenBy(c => c.Model.Name)
+                            .ThenBy(c => c.Model!.Name)
                             .ToArray());
 
                     // Add to list
@@ -256,18 +257,21 @@ namespace DiscordChatExporter.Gui.ViewModels
                 return;
 
             // Create a progress operation for each channel to export
-            var operations = ProgressManager.CreateOperations(dialog.Channels.Count);
+            var operations = ProgressManager.CreateOperations(dialog.Channels!.Count);
 
             // Export channels
             var successfulExportCount = 0;
-            for (var i = 0; i < dialog.Channels.Count; i++)
+            using var semaphore = new SemaphoreSlim(_settingsService.ParallelLimit.ClampMin(1));
+
+            await Task.WhenAll(dialog.Channels.Select(async (channel, i) =>
             {
                 var operation = operations[i];
-                var channel = dialog.Channels[i];
+
+                await semaphore.WaitAsync();
 
                 try
                 {
-                    await _exportService.ExportChatLogAsync(token, dialog.Guild, channel,
+                    await _exportService.ExportChatLogAsync(token, dialog.Guild!, channel!,
                         dialog.OutputPath!, dialog.SelectedFormat, dialog.PartitionLimit,
                         dialog.After, dialog.Before, operation);
 
@@ -275,11 +279,11 @@ namespace DiscordChatExporter.Gui.ViewModels
                 }
                 catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
                 {
-                    Notifications.Enqueue($"You don't have access to channel [{channel.Model.Name}]");
+                    Notifications.Enqueue($"You don't have access to channel [{channel.Model!.Name}]");
                 }
                 catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.NotFound)
                 {
-                    Notifications.Enqueue($"Channel [{channel.Model.Name}] doesn't exist");
+                    Notifications.Enqueue($"Channel [{channel.Model!.Name}] doesn't exist");
                 }
                 catch (DomainException ex)
                 {
@@ -288,8 +292,9 @@ namespace DiscordChatExporter.Gui.ViewModels
                 finally
                 {
                     operation.Dispose();
+                    semaphore.Release();
                 }
-            }
+            }));
 
             // Notify of overall completion
             if (successfulExportCount > 0)

DiscordChatExporter.Gui/Views/Dialogs/SettingsView.xaml

@@ -56,6 +56,21 @@
                 IsChecked="{Binding IsTokenPersisted}" />
         </DockPanel>
 
+        <!--  Parallel limit  -->
+        <StackPanel Background="Transparent" ToolTip="How many channels can be exported at the same time">
+            <TextBlock Margin="16,8">
+                <Run Text="Parallel limit:" />
+                <Run Foreground="{DynamicResource PrimaryTextBrush}" Text="{Binding ParallelLimit, Mode=OneWay}" />
+            </TextBlock>
+            <Slider
+                Margin="16,8"
+                IsSnapToTickEnabled="True"
+                Maximum="10"
+                Minimum="1"
+                TickFrequency="1"
+                Value="{Binding ParallelLimit}" />
+        </StackPanel>
+
         <!--  Save button  -->
         <Button
             Margin="8"

DiscordChatExporter.Gui/Views/RootView.xaml

@@ -246,7 +246,8 @@
                         <ListBox
                             HorizontalContentAlignment="Stretch"
                             ItemsSource="{Binding SelectedGuild.Channels}"
-                            SelectionMode="Extended">
+                            SelectionMode="Extended"
+                            TextSearch.TextPath="Model.Name">
                             <i:Interaction.Behaviors>
                                 <behaviors:ChannelViewModelMultiSelectionListBoxBehavior SelectedItems="{Binding SelectedChannels}" />
                             </i:Interaction.Behaviors>

DiscordChatExporter.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>2.17</Version>
+    <Version>2.19</Version>
     <Company>Tyrrrz</Company>
     <Copyright>Copyright (c) Alexey Golub</Copyright>
     <LangVersion>latest</LangVersion>

Readme.md

@@ -31,7 +31,7 @@ Note: This application requires .NET Core runtime in order to run:
 - Supports file partitioning based on message count
 - Uses custom markdown parser compatible with Discord syntax
 - Handles all rich media features, including attachments, embeds, emojis, etc
-- Renders to: HTML (dark & light themes), plain text (minimal), CSV (structured)
+- Renders to HTML (dark & light), TXT, CSV, JSON
 
 ## Screenshots