Streaming exporter

Fixes #125
Closes #177

DiscordChatExporter.Cli/Commands/ExportChannelCommand.cs

@@ -16,13 +16,6 @@ namespace DiscordChatExporter.Cli.Commands
         {
         }
 
-        public override async Task ExecuteAsync(IConsole console)
+        public override async Task ExecuteAsync(IConsole console) => await ExportAsync(console, ChannelId);
-        {
-            // Get channel
-            var channel = await DataService.GetChannelAsync(GetToken(), ChannelId);
-
-            // Export
-            await ExportChannelAsync(console, channel);
-        }
     }
 }

DiscordChatExporter.Cli/Commands/ExportCommandBase.cs

@@ -6,7 +6,6 @@ using CliFx.Services;
 using CliFx.Utilities;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
-using DiscordChatExporter.Core.Services.Helpers;
 
 namespace DiscordChatExporter.Cli.Commands
 {
@@ -16,17 +15,16 @@ namespace DiscordChatExporter.Cli.Commands
 
         protected ExportService ExportService { get; }
 
-
         [CommandOption("format", 'f', Description = "Output file format.")]
         public ExportFormat ExportFormat { get; set; } = ExportFormat.HtmlDark;
 
         [CommandOption("output", 'o', Description = "Output file or directory path.")]
         public string? OutputPath { get; set; }
 
-        [CommandOption("after",Description = "Limit to messages sent after this date.")]
+        [CommandOption("after", Description = "Limit to messages sent after this date.")]
         public DateTimeOffset? After { get; set; }
 
-        [CommandOption("before",Description = "Limit to messages sent before this date.")]
+        [CommandOption("before", Description = "Limit to messages sent before this date.")]
         public DateTimeOffset? Before { get; set; }
 
         [CommandOption("partition", 'p', Description = "Split output into partitions limited to this number of messages.")]
@@ -42,34 +40,32 @@ namespace DiscordChatExporter.Cli.Commands
             ExportService = exportService;
         }
 
-        protected async Task ExportChannelAsync(IConsole console, Channel channel)
+        protected async Task ExportAsync(IConsole console, Guild guild, Channel channel)
         {
-            // Configure settings
             if (!string.IsNullOrWhiteSpace(DateFormat))
-                SettingsService.DateFormat = DateFormat!;
+                SettingsService.DateFormat = DateFormat;
 
             console.Output.Write($"Exporting channel [{channel.Name}]... ");
             var progress = console.CreateProgressTicker();
 
-            // Get chat log
+            var outputPath = OutputPath ?? Directory.GetCurrentDirectory();
-            var chatLog = await DataService.GetChatLogAsync(GetToken(), channel, After, Before, progress);
+            await ExportService.ExportChatLogAsync(GetToken(), guild, channel,
-
+                outputPath, ExportFormat, PartitionLimit,
-            // Generate file path if not set or is a directory
+                After, Before, progress);
-            var filePath = OutputPath;
-            if (string.IsNullOrWhiteSpace(filePath) || ExportHelper.IsDirectoryPath(filePath))
-            {
-                // Generate default file name
-                var fileName = ExportHelper.GetDefaultExportFileName(ExportFormat, chatLog.Guild,
-                    chatLog.Channel, After, Before);
 
-                // Combine paths
+            console.Output.WriteLine();
-                filePath = Path.Combine(filePath ?? "", fileName);
+        }
-            }
 
-            // Export
+        protected async Task ExportAsync(IConsole console, Channel channel)
-            await ExportService.ExportChatLogAsync(chatLog, filePath, ExportFormat, PartitionLimit);
+        {
+            var guild = await DataService.GetGuildAsync(GetToken(), channel.GuildId);
+            await ExportAsync(console, guild, channel);
+        }
 
-            console.Output.WriteLine();
+        protected async Task ExportAsync(IConsole console, string channelId)
+        {
+            var channel = await DataService.GetChannelAsync(GetToken(), channelId);
+            await ExportAsync(console, channel);
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportDirectMessagesCommand.cs

@@ -29,7 +29,7 @@ namespace DiscordChatExporter.Cli.Commands
             {
                 try
                 {
-                    await ExportChannelAsync(console, channel);
+                    await ExportAsync(console, channel);
                 }
                 catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
                 {

DiscordChatExporter.Cli/Commands/ExportGuildCommand.cs

@@ -33,7 +33,7 @@ namespace DiscordChatExporter.Cli.Commands
             {
                 try
                 {
-                    await ExportChannelAsync(console, channel);
+                    await ExportAsync(console, channel);
                 }
                 catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
                 {

DiscordChatExporter.Core.Markdown/MarkdownParser.cs

@@ -210,6 +210,7 @@ namespace DiscordChatExporter.Core.Markdown
             StandardEmojiNodeMatcher,
             CustomEmojiNodeMatcher);
 
+        // Minimal set of matchers for non-multimedia formats (e.g. plain text)
         private static readonly IMatcher<Node> MinimalAggregateNodeMatcher = new AggregateMatcher<Node>(
             // Mentions
             EveryoneMentionNodeMatcher,
@@ -219,7 +220,6 @@ namespace DiscordChatExporter.Core.Markdown
             RoleMentionNodeMatcher,
 
             // Emoji
-            StandardEmojiNodeMatcher,
             CustomEmojiNodeMatcher);
 
         private static IReadOnlyList<Node> Parse(StringPart stringPart, IMatcher<Node> matcher) =>

DiscordChatExporter.Core.Models/ChatLog.cs

@@ -1,33 +0,0 @@
-using System;
-using System.Collections.Generic;
-
-namespace DiscordChatExporter.Core.Models
-{
-    public class ChatLog
-    {
-        public Guild Guild { get; }
-
-        public Channel Channel { get; }
-
-        public DateTimeOffset? After { get; }
-
-        public DateTimeOffset? Before { get; }
-
-        public IReadOnlyList<Message> Messages { get; }
-
-        public Mentionables Mentionables { get; }
-
-        public ChatLog(Guild guild, Channel channel, DateTimeOffset? after, DateTimeOffset? before,
-            IReadOnlyList<Message> messages, Mentionables mentionables)
-        {
-            Guild = guild;
-            Channel = channel;
-            After = after;
-            Before = before;
-            Messages = messages;
-            Mentionables = mentionables;
-        }
-
-        public override string ToString() => $"{Guild.Name} | {Channel.Name}";
-    }
-}

DiscordChatExporter.Core.Models/Emoji.cs

@@ -6,7 +6,7 @@ namespace DiscordChatExporter.Core.Models
 {
     // https://discordapp.com/developers/docs/resources/emoji#emoji-object
 
-    public partial class Emoji : IHasId
+    public partial class Emoji
     {
         public string? Id { get; }
 

DiscordChatExporter.Core.Models/Extensions.cs

@@ -27,7 +27,7 @@ namespace DiscordChatExporter.Core.Models
                 ExportFormat.PlainText => "Plain Text",
                 ExportFormat.HtmlDark => "HTML (Dark)",
                 ExportFormat.HtmlLight => "HTML (Light)",
-                ExportFormat.Csv => "Comma Seperated Values (CSV)",
+                ExportFormat.Csv => "Comma Separated Values (CSV)",
                 _ => throw new ArgumentOutOfRangeException(nameof(format))
             };
     }

DiscordChatExporter.Core.Models/Mentionables.cs

@@ -1,30 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-
-namespace DiscordChatExporter.Core.Models
-{
-    public class Mentionables
-    {
-        public IReadOnlyList<User> Users { get; }
-
-        public IReadOnlyList<Channel> Channels { get; }
-
-        public IReadOnlyList<Role> Roles { get; }
-
-        public Mentionables(IReadOnlyList<User> users, IReadOnlyList<Channel> channels, IReadOnlyList<Role> roles)
-        {
-            Users = users;
-            Channels = channels;
-            Roles = roles;
-        }
-
-        public User GetUser(string id) =>
-            Users.FirstOrDefault(u => u.Id == id) ?? User.CreateUnknownUser(id);
-
-        public Channel GetChannel(string id) =>
-            Channels.FirstOrDefault(c => c.Id == id) ?? Channel.CreateDeletedChannel(id);
-
-        public Role GetRole(string id) =>
-            Roles.FirstOrDefault(r => r.Id == id) ?? Role.CreateDeletedRole(id);
-    }
-}

DiscordChatExporter.Core.Models/Message.cs

@@ -19,6 +19,8 @@ namespace DiscordChatExporter.Core.Models
 
         public DateTimeOffset? EditedTimestamp { get; }
 
+        public bool IsPinned { get; }
+
         public string? Content { get; }
 
         public IReadOnlyList<Attachment> Attachments { get; }
@@ -29,12 +31,11 @@ namespace DiscordChatExporter.Core.Models
 
         public IReadOnlyList<User> MentionedUsers { get; }
 
-        public bool IsPinned { get; }
+        public Message(string id, string channelId, MessageType type, User author,
-
+            DateTimeOffset timestamp, DateTimeOffset? editedTimestamp, bool isPinned,
-        public Message(string id, string channelId, MessageType type, User author, DateTimeOffset timestamp,
+            string content,
-            DateTimeOffset? editedTimestamp, string? content, IReadOnlyList<Attachment> attachments,
+            IReadOnlyList<Attachment> attachments,IReadOnlyList<Embed> embeds, IReadOnlyList<Reaction> reactions,
-            IReadOnlyList<Embed> embeds, IReadOnlyList<Reaction> reactions, IReadOnlyList<User> mentionedUsers,
+            IReadOnlyList<User> mentionedUsers)
-            bool isPinned)
         {
             Id = id;
             ChannelId = channelId;
@@ -42,12 +43,12 @@ namespace DiscordChatExporter.Core.Models
             Author = author;
             Timestamp = timestamp;
             EditedTimestamp = editedTimestamp;
+            IsPinned = isPinned;
             Content = content;
             Attachments = attachments;
             Embeds = embeds;
             Reactions = reactions;
             MentionedUsers = mentionedUsers;
-            IsPinned = isPinned;
         }
 
         public override string ToString() => Content ?? "<message without content>";

DiscordChatExporter.Core.Models/MessageGroup.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+
+namespace DiscordChatExporter.Core.Models
+{
+    // Used for grouping contiguous messages in HTML export
+
+    public class MessageGroup
+    {
+        public User Author { get; }
+
+        public DateTimeOffset Timestamp { get; }
+
+        public IReadOnlyList<Message> Messages { get; }
+
+        public MessageGroup(User author, DateTimeOffset timestamp, IReadOnlyList<Message> messages)
+        {
+            Author = author;
+            Timestamp = timestamp;
+            Messages = messages;
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/CsvChatLogRenderer.cs

@@ -1,123 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using DiscordChatExporter.Core.Markdown;
-using DiscordChatExporter.Core.Markdown.Nodes;
-using DiscordChatExporter.Core.Models;
-using Tyrrrz.Extensions;
-
-namespace DiscordChatExporter.Core.Rendering
-{
-    public class CsvChatLogRenderer : IChatLogRenderer
-    {
-        private readonly ChatLog _chatLog;
-        private readonly string _dateFormat;
-
-        public CsvChatLogRenderer(ChatLog chatLog, string dateFormat)
-        {
-            _chatLog = chatLog;
-            _dateFormat = dateFormat;
-        }
-
-        private string FormatDate(DateTimeOffset date) =>
-            date.ToLocalTime().ToString(_dateFormat, CultureInfo.InvariantCulture);
-
-        private string FormatMarkdown(Node node)
-        {
-            // Text node
-            if (node is TextNode textNode)
-            {
-                return textNode.Text;
-            }
-
-            // Mention node
-            if (node is MentionNode mentionNode)
-            {
-                // Meta mention node
-                if (mentionNode.Type == MentionType.Meta)
-                {
-                    return mentionNode.Id;
-                }
-
-                // User mention node
-                if (mentionNode.Type == MentionType.User)
-                {
-                    var user = _chatLog.Mentionables.GetUser(mentionNode.Id);
-                    return $"@{user.Name}";
-                }
-
-                // Channel mention node
-                if (mentionNode.Type == MentionType.Channel)
-                {
-                    var channel = _chatLog.Mentionables.GetChannel(mentionNode.Id);
-                    return $"#{channel.Name}";
-                }
-
-                // Role mention node
-                if (mentionNode.Type == MentionType.Role)
-                {
-                    var role = _chatLog.Mentionables.GetRole(mentionNode.Id);
-                    return $"@{role.Name}";
-                }
-            }
-
-            // Emoji node
-            if (node is EmojiNode emojiNode)
-            {
-                return emojiNode.IsCustomEmoji ? $":{emojiNode.Name}:" : emojiNode.Name;
-            }
-
-            // Throw on unexpected nodes
-            throw new InvalidOperationException($"Unexpected node: [{node.GetType()}].");
-        }
-
-        private string FormatMarkdown(IEnumerable<Node> nodes) => nodes.Select(FormatMarkdown).JoinToString("");
-
-        private string FormatMarkdown(string markdown) => FormatMarkdown(MarkdownParser.ParseMinimal(markdown));
-
-        private async Task RenderFieldAsync(TextWriter writer, string value)
-        {
-            var encodedValue = value.Replace("\"", "\"\"");
-            await writer.WriteAsync($"\"{encodedValue}\",");
-        }
-
-        private async Task RenderMessageAsync(TextWriter writer, Message message)
-        {
-            // Author ID
-            await RenderFieldAsync(writer, message.Author.Id);
-
-            // Author
-            await RenderFieldAsync(writer, message.Author.FullName);
-
-            // Timestamp
-            await RenderFieldAsync(writer, FormatDate(message.Timestamp));
-
-            // Content
-            await RenderFieldAsync(writer, FormatMarkdown(message.Content ?? ""));
-
-            // Attachments
-            var formattedAttachments = message.Attachments.Select(a => a.Url).JoinToString(",");
-            await RenderFieldAsync(writer, formattedAttachments);
-
-            // Reactions
-            var formattedReactions = message.Reactions.Select(r => $"{r.Emoji.Name} ({r.Count})").JoinToString(",");
-            await RenderFieldAsync(writer, formattedReactions);
-
-            // Line break
-            await writer.WriteLineAsync();
-        }
-
-        public async Task RenderAsync(TextWriter writer)
-        {
-            // Headers
-            await writer.WriteLineAsync("AuthorID;Author;Date;Content;Attachments;Reactions;");
-
-            // Log
-            foreach (var message in _chatLog.Messages)
-                await RenderMessageAsync(writer, message);
-        }
-    }
-}

DiscordChatExporter.Core.Rendering/CsvMessageRenderer.cs

@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Rendering.Logic;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public class CsvMessageRenderer : MessageRendererBase
+    {
+        private bool _isHeaderRendered;
+
+        public CsvMessageRenderer(string filePath, RenderContext context)
+            : base(filePath, context)
+        {
+        }
+
+        public override async Task RenderMessageAsync(Message message)
+        {
+            // Render header if it's the first entry
+            if (!_isHeaderRendered)
+            {
+                await Writer.WriteLineAsync(CsvRenderingLogic.FormatHeader(Context));
+                _isHeaderRendered = true;
+            }
+
+            await Writer.WriteLineAsync(CsvRenderingLogic.FormatMessage(Context, message));
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/DiscordChatExporter.Core.Rendering.csproj

@@ -6,12 +6,11 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <EmbeddedResource Include="Resources\HtmlCore.css" />
     <EmbeddedResource Include="Resources\HtmlDark.css" />
-    <EmbeddedResource Include="Resources\HtmlDark.html" />
     <EmbeddedResource Include="Resources\HtmlLight.css" />
-    <EmbeddedResource Include="Resources\HtmlLight.html" />
+    <EmbeddedResource Include="Resources\HtmlLayoutTemplate.html" />
-    <EmbeddedResource Include="Resources\HtmlShared.css" />
+    <EmbeddedResource Include="Resources\HtmlMessageGroupTemplate.html" />
-    <EmbeddedResource Include="Resources\HtmlShared.html" />
   </ItemGroup>
 
   <ItemGroup>

DiscordChatExporter.Core.Rendering/HtmlChatLogRenderer.MessageGroup.cs

@@ -1,25 +0,0 @@
-using System;
-using System.Collections.Generic;
-using DiscordChatExporter.Core.Models;
-
-namespace DiscordChatExporter.Core.Rendering
-{
-    public partial class HtmlChatLogRenderer
-    {
-        private class MessageGroup
-        {
-            public User Author { get; }
-
-            public DateTimeOffset Timestamp { get; }
-
-            public IReadOnlyList<Message> Messages { get; }
-
-            public MessageGroup(User author, DateTimeOffset timestamp, IReadOnlyList<Message> messages)
-            {
-                Author = author;
-                Timestamp = timestamp;
-                Messages = messages;
-            }
-        }
-    }
-}

DiscordChatExporter.Core.Rendering/HtmlChatLogRenderer.TemplateLoader.cs

@@ -1,27 +0,0 @@
-using System.Reflection;
-using System.Threading.Tasks;
-using Scriban;
-using Scriban.Parsing;
-using Scriban.Runtime;
-using Tyrrrz.Extensions;
-
-namespace DiscordChatExporter.Core.Rendering
-{
-    public partial class HtmlChatLogRenderer
-    {
-        private class TemplateLoader : ITemplateLoader
-        {
-            private const string ResourceRootNamespace = "DiscordChatExporter.Core.Rendering.Resources";
-
-            public string Load(string templatePath) =>
-                Assembly.GetExecutingAssembly().GetManifestResourceString($"{ResourceRootNamespace}.{templatePath}");
-
-            public string GetPath(TemplateContext context, SourceSpan callerSpan, string templateName) => templateName;
-
-            public string Load(TemplateContext context, SourceSpan callerSpan, string templatePath) => Load(templatePath);
-
-            public ValueTask<string> LoadAsync(TemplateContext context, SourceSpan callerSpan, string templatePath) =>
-                new ValueTask<string>(Load(templatePath));
-        }
-    }
-}

DiscordChatExporter.Core.Rendering/HtmlMessageRenderer.cs

@@ -0,0 +1,169 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Rendering.Logic;
+using Scriban;
+using Scriban.Runtime;
+using Tyrrrz.Extensions;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public partial class HtmlMessageRenderer : MessageRendererBase
+    {
+        private readonly string _themeName;
+        private readonly List<Message> _messageGroupBuffer = new List<Message>();
+
+        private bool _isLeadingBlockRendered;
+
+        public HtmlMessageRenderer(string filePath, RenderContext context, string themeName)
+            : base(filePath, context)
+        {
+            _themeName = themeName;
+        }
+
+        private MessageGroup GetCurrentMessageGroup()
+        {
+            var firstMessage = _messageGroupBuffer.First();
+            return new MessageGroup(firstMessage.Author, firstMessage.Timestamp, _messageGroupBuffer);
+        }
+
+        private async Task RenderLeadingBlockAsync()
+        {
+            var template = Template.Parse(GetLeadingBlockTemplateCode());
+            var templateContext = CreateTemplateContext();
+            var scriptObject = CreateScriptObject(Context, _themeName);
+
+            templateContext.PushGlobal(scriptObject);
+            templateContext.PushOutput(new TextWriterOutput(Writer));
+
+            await templateContext.EvaluateAsync(template.Page);
+        }
+
+        private async Task RenderTrailingBlockAsync()
+        {
+            var template = Template.Parse(GetTrailingBlockTemplateCode());
+            var templateContext = CreateTemplateContext();
+            var scriptObject = CreateScriptObject(Context, _themeName);
+
+            templateContext.PushGlobal(scriptObject);
+            templateContext.PushOutput(new TextWriterOutput(Writer));
+
+            await templateContext.EvaluateAsync(template.Page);
+        }
+
+        private async Task RenderCurrentMessageGroupAsync()
+        {
+            var template = Template.Parse(GetMessageGroupTemplateCode());
+            var templateContext = CreateTemplateContext();
+            var scriptObject = CreateScriptObject(Context, _themeName);
+
+            scriptObject.SetValue("MessageGroup", GetCurrentMessageGroup(), true);
+
+            templateContext.PushGlobal(scriptObject);
+            templateContext.PushOutput(new TextWriterOutput(Writer));
+
+            await templateContext.EvaluateAsync(template.Page);
+        }
+
+        public override async Task RenderMessageAsync(Message message)
+        {
+            // Render leading block if it's the first entry
+            if (!_isLeadingBlockRendered)
+            {
+                await RenderLeadingBlockAsync();
+                _isLeadingBlockRendered = true;
+            }
+
+            // If message group is empty or the given message can be grouped, buffer the given message
+            if (!_messageGroupBuffer.Any() || HtmlRenderingLogic.CanBeGrouped(_messageGroupBuffer.Last(), message))
+            {
+                _messageGroupBuffer.Add(message);
+            }
+            // Otherwise, flush the group and render messages
+            else
+            {
+                await RenderCurrentMessageGroupAsync();
+
+                _messageGroupBuffer.Clear();
+                _messageGroupBuffer.Add(message);
+            }
+        }
+
+        public override async ValueTask DisposeAsync()
+        {
+            // Leading block (can happen if no message were rendered)
+            if (!_isLeadingBlockRendered)
+                await RenderLeadingBlockAsync();
+
+            // Flush current message group
+            if (_messageGroupBuffer.Any())
+                await RenderCurrentMessageGroupAsync();
+
+            // Trailing block
+            await RenderTrailingBlockAsync();
+
+            await base.DisposeAsync();
+        }
+    }
+
+    public partial class HtmlMessageRenderer
+    {
+        private static readonly Assembly ResourcesAssembly = typeof(HtmlRenderingLogic).Assembly;
+        private static readonly string ResourcesNamespace = $"{ResourcesAssembly.GetName().Name}.Resources";
+
+        private static string GetCoreStyleSheetCode() =>
+            ResourcesAssembly
+                .GetManifestResourceString($"{ResourcesNamespace}.HtmlCore.css");
+
+        private static string GetThemeStyleSheetCode(string themeName) =>
+            ResourcesAssembly
+                .GetManifestResourceString($"{ResourcesNamespace}.Html{themeName}.css");
+
+        private static string GetLeadingBlockTemplateCode() =>
+            ResourcesAssembly
+                .GetManifestResourceString($"{ResourcesNamespace}.HtmlLayoutTemplate.html")
+                .SubstringUntil("{{~ %SPLIT% ~}}");
+
+        private static string GetTrailingBlockTemplateCode() =>
+            ResourcesAssembly
+                .GetManifestResourceString($"{ResourcesNamespace}.HtmlLayoutTemplate.html")
+                .SubstringAfter("{{~ %SPLIT% ~}}");
+
+        private static string GetMessageGroupTemplateCode() =>
+            ResourcesAssembly
+                .GetManifestResourceString($"{ResourcesNamespace}.HtmlMessageGroupTemplate.html");
+
+        private static ScriptObject CreateScriptObject(RenderContext context, string themeName)
+        {
+            var scriptObject = new ScriptObject();
+
+            // Constants
+            scriptObject.SetValue("Context", context, true);
+            scriptObject.SetValue("CoreStyleSheet", GetCoreStyleSheetCode(), true);
+            scriptObject.SetValue("ThemeStyleSheet", GetThemeStyleSheetCode(themeName), true);
+            scriptObject.SetValue("HighlightJsStyleName", $"solarized-{themeName.ToLowerInvariant()}", true);
+
+            // Functions
+
+            scriptObject.Import("FormatDate",
+                new Func<DateTimeOffset, string>(d => SharedRenderingLogic.FormatDate(d, context.DateFormat)));
+
+            scriptObject.Import("FormatMarkdown",
+                new Func<string, string>(m => HtmlRenderingLogic.FormatMarkdown(context, m)));
+
+            return scriptObject;
+        }
+
+        private static TemplateContext CreateTemplateContext() =>
+            new TemplateContext
+            {
+                MemberRenamer = m => m.Name,
+                MemberFilter = m => true,
+                LoopLimit = int.MaxValue,
+                StrictVariables = true
+            };
+    }
+}

DiscordChatExporter.Core.Rendering/IChatLogRenderer.cs

@@ -1,10 +0,0 @@
-using System.IO;
-using System.Threading.Tasks;
-
-namespace DiscordChatExporter.Core.Rendering
-{
-    public interface IChatLogRenderer
-    {
-        Task RenderAsync(TextWriter writer);
-    }
-}

DiscordChatExporter.Core.Rendering/IMessageRenderer.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public interface IMessageRenderer : IAsyncDisposable
+    {
+        Task RenderMessageAsync(Message message);
+    }
+}

DiscordChatExporter.Core.Rendering/Internal/Extensions.cs

@@ -0,0 +1,21 @@
+using System.Text;
+
+namespace DiscordChatExporter.Core.Rendering.Internal
+{
+    internal static class Extensions
+    {
+        public static StringBuilder AppendLineIfNotEmpty(this StringBuilder builder, string value) =>
+            !string.IsNullOrWhiteSpace(value) ? builder.AppendLine(value) : builder;
+
+        public static StringBuilder Trim(this StringBuilder builder)
+        {
+            while (builder.Length > 0 && char.IsWhiteSpace(builder[0]))
+                builder.Remove(0, 1);
+
+            while (builder.Length > 0 && char.IsWhiteSpace(builder[^1]))
+                builder.Remove(builder.Length - 1, 1);
+
+            return builder;
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/Logic/CsvRenderingLogic.cs

@@ -0,0 +1,39 @@
+using System.Linq;
+using System.Text;
+using DiscordChatExporter.Core.Models;
+using Tyrrrz.Extensions;
+
+using static DiscordChatExporter.Core.Rendering.Logic.SharedRenderingLogic;
+
+namespace DiscordChatExporter.Core.Rendering.Logic
+{
+    public static class CsvRenderingLogic
+    {
+        // Header is always the same
+        public static string FormatHeader(RenderContext context) => "AuthorID,Author,Date,Content,Attachments,Reactions";
+
+        private static string EncodeValue(string value)
+        {
+            value = value.Replace("\"", "\"\"");
+            return $"\"{value}\"";
+        }
+
+        public static string FormatMarkdown(RenderContext context, string markdown) =>
+            PlainTextRenderingLogic.FormatMarkdown(context, markdown);
+
+        public static string FormatMessage(RenderContext context, Message message)
+        {
+            var buffer = new StringBuilder();
+
+            buffer
+                .Append(EncodeValue(message.Author.Id)).Append(',')
+                .Append(EncodeValue(message.Author.FullName)).Append(',')
+                .Append(EncodeValue(FormatDate(message.Timestamp, context.DateFormat))).Append(',')
+                .Append(EncodeValue(FormatMarkdown(context, message.Content ?? ""))).Append(',')
+                .Append(EncodeValue(message.Attachments.Select(a => a.Url).JoinToString(","))).Append(',')
+                .Append(EncodeValue(message.Reactions.Select(r => $"{r.Emoji.Name} ({r.Count})").JoinToString(",")));
+
+            return buffer.ToString();
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/Logic/HtmlRenderingLogic.cs

@@ -1,53 +1,31 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
 using System.Linq;
 using System.Net;
 using System.Text.RegularExpressions;
-using System.Threading.Tasks;
 using DiscordChatExporter.Core.Markdown;
 using DiscordChatExporter.Core.Markdown.Nodes;
 using DiscordChatExporter.Core.Models;
-using Scriban;
-using Scriban.Runtime;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Core.Rendering
+namespace DiscordChatExporter.Core.Rendering.Logic
 {
-    public partial class HtmlChatLogRenderer : IChatLogRenderer
+    internal static class HtmlRenderingLogic
     {
-        private readonly ChatLog _chatLog;
+        public static bool CanBeGrouped(Message message1, Message message2)
-        private readonly string _themeName;
-        private readonly string _dateFormat;
-
-        public HtmlChatLogRenderer(ChatLog chatLog, string themeName, string dateFormat)
         {
-            _chatLog = chatLog;
+            if (message1.Author.Id != message2.Author.Id)
-            _themeName = themeName;
+                return false;
-            _dateFormat = dateFormat;
-        }
-
-        private string HtmlEncode(string s) => WebUtility.HtmlEncode(s);
-
-        private string FormatDate(DateTimeOffset date) =>
-            date.ToLocalTime().ToString(_dateFormat, CultureInfo.InvariantCulture);
 
-        private IEnumerable<MessageGroup> GroupMessages(IEnumerable<Message> messages) =>
+            if ((message2.Timestamp - message1.Timestamp).Duration().TotalMinutes > 7)
-            messages.GroupContiguous((buffer, message) =>
+                return false;
-            {
-                // Break group if the author changed
-                if (buffer.Last().Author.Id != message.Author.Id)
-                    return false;
 
-                // Break group if last message was more than 7 minutes ago
+            return true;
-                if ((message.Timestamp - buffer.Last().Timestamp).TotalMinutes > 7)
+        }
-                    return false;
 
-                return true;
+        private static string HtmlEncode(string s) => WebUtility.HtmlEncode(s);
-            }).Select(g => new MessageGroup(g.First().Author, g.First().Timestamp, g));
 
-        private string FormatMarkdown(Node node, bool isJumbo)
+        private static string FormatMarkdownNode(RenderContext context, Node node, bool isJumbo)
         {
             // Text node
             if (node is TextNode textNode)
@@ -60,7 +38,7 @@ namespace DiscordChatExporter.Core.Rendering
             if (node is FormattedNode formattedNode)
             {
                 // Recursively get inner html
-                var innerHtml = FormatMarkdown(formattedNode.Children, false);
+                var innerHtml = FormatMarkdownNodes(context, formattedNode.Children, false);
 
                 // Bold
                 if (formattedNode.Formatting == TextFormatting.Bold)
@@ -116,21 +94,27 @@ namespace DiscordChatExporter.Core.Rendering
                 // User mention node
                 if (mentionNode.Type == MentionType.User)
                 {
-                    var user = _chatLog.Mentionables.GetUser(mentionNode.Id);
+                    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>";
                 }
 
                 // Channel mention node
                 if (mentionNode.Type == MentionType.Channel)
                 {
-                    var channel = _chatLog.Mentionables.GetChannel(mentionNode.Id);
+                    var channel = context.MentionableChannels.FirstOrDefault(c => c.Id == mentionNode.Id) ??
+                                  Channel.CreateDeletedChannel(mentionNode.Id);
+
                     return $"<span class=\"mention\">#{HtmlEncode(channel.Name)}</span>";
                 }
 
                 // Role mention node
                 if (mentionNode.Type == MentionType.Role)
                 {
-                    var role = _chatLog.Mentionables.GetRole(mentionNode.Id);
+                    var role = context.MentionableRoles.FirstOrDefault(r => r.Id == mentionNode.Id) ??
+                               Role.CreateDeletedRole(mentionNode.Id);
+
                     return $"<span class=\"mention\">@{HtmlEncode(role.Name)}</span>";
                 }
             }
@@ -159,52 +143,18 @@ namespace DiscordChatExporter.Core.Rendering
             }
 
             // Throw on unexpected nodes
-            throw new InvalidOperationException($"Unexpected node: [{node.GetType()}].");
+            throw new InvalidOperationException($"Unexpected node [{node.GetType()}].");
         }
 
-        private string FormatMarkdown(IReadOnlyList<Node> nodes, bool isTopLevel)
+        private static string FormatMarkdownNodes(RenderContext context, IReadOnlyList<Node> nodes, bool isTopLevel)
         {
             // Emojis are jumbo if all top-level nodes are emoji nodes or whitespace text nodes
             var isJumbo = isTopLevel && nodes.All(n => n is EmojiNode || n is TextNode textNode && string.IsNullOrWhiteSpace(textNode.Text));
 
-            return nodes.Select(n => FormatMarkdown(n, isJumbo)).JoinToString("");
+            return nodes.Select(n => FormatMarkdownNode(context, n, isJumbo)).JoinToString("");
         }
 
-        private string FormatMarkdown(string markdown) => FormatMarkdown(MarkdownParser.Parse(markdown), true);
+        public static string FormatMarkdown(RenderContext context, string markdown) =>
-
+            FormatMarkdownNodes(context, MarkdownParser.Parse(markdown), true);
-        public async Task RenderAsync(TextWriter writer)
-        {
-            // Create template loader
-            var loader = new TemplateLoader();
-
-            // Get template
-            var templateCode = loader.Load($"Html{_themeName}.html");
-            var template = Template.Parse(templateCode);
-
-            // Create template context
-            var context = new TemplateContext
-            {
-                TemplateLoader = loader,
-                MemberRenamer = m => m.Name,
-                MemberFilter = m => true,
-                LoopLimit = int.MaxValue,
-                StrictVariables = true
-            };
-
-            // Create template model
-            var model = new ScriptObject();
-            model.SetValue("Model", _chatLog, true);
-            model.Import(nameof(GroupMessages), new Func<IEnumerable<Message>, IEnumerable<MessageGroup>>(GroupMessages));
-            model.Import(nameof(FormatDate), new Func<DateTimeOffset, string>(FormatDate));
-            model.Import(nameof(FormatMarkdown), new Func<string, string>(FormatMarkdown));
-            context.PushGlobal(model);
-
-            // Configure output
-            context.PushOutput(new TextWriterOutput(writer));
-
-            // HACK: Render output in a separate thread
-            // (even though Scriban has async API, it still makes a lot of blocking CPU-bound calls)
-            await Task.Run(async () => await context.EvaluateAsync(template.Page));
-        }
     }
 }

DiscordChatExporter.Core.Rendering/Logic/PlainTextRenderingLogic.cs

@@ -0,0 +1,235 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using DiscordChatExporter.Core.Markdown;
+using DiscordChatExporter.Core.Markdown.Nodes;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Rendering.Internal;
+using Tyrrrz.Extensions;
+
+using static DiscordChatExporter.Core.Rendering.Logic.SharedRenderingLogic;
+
+namespace DiscordChatExporter.Core.Rendering.Logic
+{
+    public static class PlainTextRenderingLogic
+    {
+        public static string FormatPreamble(RenderContext context)
+        {
+            var buffer = new StringBuilder();
+
+            buffer.AppendLine('='.Repeat(62));
+            buffer.AppendLine($"Guild: {context.Guild.Name}");
+            buffer.AppendLine($"Channel: {context.Channel.Name}");
+
+            if (!string.IsNullOrWhiteSpace(context.Channel.Topic))
+                buffer.AppendLine($"Topic: {context.Channel.Topic}");
+
+            if (context.After != null)
+                buffer.AppendLine($"After: {FormatDate(context.After.Value, context.DateFormat)}");
+
+            if (context.Before != null)
+                buffer.AppendLine($"Before: {FormatDate(context.Before.Value, context.DateFormat)}");
+
+            buffer.AppendLine('='.Repeat(62));
+
+            return buffer.ToString();
+        }
+
+        private static string FormatMarkdownNode(RenderContext context, Node node)
+        {
+            // Text node
+            if (node is TextNode textNode)
+            {
+                return textNode.Text;
+            }
+
+            // Mention node
+            if (node is MentionNode mentionNode)
+            {
+                // Meta mention node
+                if (mentionNode.Type == MentionType.Meta)
+                {
+                    return $"@{mentionNode.Id}";
+                }
+
+                // User mention node
+                if (mentionNode.Type == MentionType.User)
+                {
+                    var user = context.MentionableUsers.FirstOrDefault(u => u.Id == mentionNode.Id) ??
+                               User.CreateUnknownUser(mentionNode.Id);
+
+                    return $"@{user.Name}";
+                }
+
+                // Channel mention node
+                if (mentionNode.Type == MentionType.Channel)
+                {
+                    var channel = context.MentionableChannels.FirstOrDefault(c => c.Id == mentionNode.Id) ??
+                                  Channel.CreateDeletedChannel(mentionNode.Id);
+
+                    return $"#{channel.Name}";
+                }
+
+                // Role mention node
+                if (mentionNode.Type == MentionType.Role)
+                {
+                    var role = context.MentionableRoles.FirstOrDefault(r => r.Id == mentionNode.Id) ??
+                               Role.CreateDeletedRole(mentionNode.Id);
+
+                    return $"@{role.Name}";
+                }
+            }
+
+            // Emoji node
+            if (node is EmojiNode emojiNode)
+            {
+                return emojiNode.IsCustomEmoji ? $":{emojiNode.Name}:" : emojiNode.Name;
+            }
+
+            // Throw on unexpected nodes
+            throw new InvalidOperationException($"Unexpected node [{node.GetType()}].");
+        }
+
+        public static string FormatMarkdown(RenderContext context, string markdown) =>
+            MarkdownParser.ParseMinimal(markdown).Select(n => FormatMarkdownNode(context, n)).JoinToString("");
+
+        public static string FormatMessageHeader(RenderContext context, Message message)
+        {
+            var buffer = new StringBuilder();
+
+            // Timestamp & author
+            buffer
+                .Append($"[{FormatDate(message.Timestamp, context.DateFormat)}]")
+                .Append(' ')
+                .Append($"{message.Author.FullName}");
+
+            // Whether the message is pinned
+            if (message.IsPinned)
+            {
+                buffer.Append(' ').Append("(pinned)");
+            }
+
+            return buffer.ToString();
+        }
+
+        public static string FormatMessageContent(RenderContext context, Message message)
+        {
+            if (string.IsNullOrWhiteSpace(message.Content))
+                return "";
+
+            return FormatMarkdown(context, message.Content);
+        }
+
+        public static string FormatAttachments(RenderContext context, IReadOnlyList<Attachment> attachments)
+        {
+            if (!attachments.Any())
+                return "";
+
+            var buffer = new StringBuilder();
+
+            buffer
+                .AppendLine("{Attachments}")
+                .AppendJoin(Environment.NewLine, attachments.Select(a => a.Url))
+                .AppendLine();
+
+            return buffer.ToString();
+        }
+
+        public static string FormatEmbeds(RenderContext context, IReadOnlyList<Embed> embeds)
+        {
+            if (!embeds.Any())
+                return "";
+
+            var buffer = new StringBuilder();
+
+            foreach (var embed in embeds)
+            {
+                buffer.AppendLine("{Embed}");
+
+                // Author name
+                if (!string.IsNullOrWhiteSpace(embed.Author?.Name))
+                    buffer.AppendLine(embed.Author.Name);
+
+                // URL
+                if (!string.IsNullOrWhiteSpace(embed.Url))
+                    buffer.AppendLine(embed.Url);
+
+                // Title
+                if (!string.IsNullOrWhiteSpace(embed.Title))
+                    buffer.AppendLine(FormatMarkdown(context, embed.Title));
+
+                // Description
+                if (!string.IsNullOrWhiteSpace(embed.Description))
+                    buffer.AppendLine(FormatMarkdown(context, embed.Description));
+
+                // Fields
+                foreach (var field in embed.Fields)
+                {
+                    // Name
+                    if (!string.IsNullOrWhiteSpace(field.Name))
+                        buffer.AppendLine(field.Name);
+
+                    // Value
+                    if (!string.IsNullOrWhiteSpace(field.Value))
+                        buffer.AppendLine(field.Value);
+                }
+
+                // Thumbnail URL
+                if (!string.IsNullOrWhiteSpace(embed.Thumbnail?.Url))
+                    buffer.AppendLine(embed.Thumbnail?.Url);
+
+                // Image URL
+                if (!string.IsNullOrWhiteSpace(embed.Image?.Url))
+                    buffer.AppendLine(embed.Image?.Url);
+
+                // Footer text
+                if (!string.IsNullOrWhiteSpace(embed.Footer?.Text))
+                    buffer.AppendLine(embed.Footer?.Text);
+
+                buffer.AppendLine();
+            }
+
+            return buffer.ToString();
+        }
+
+        public static string FormatReactions(RenderContext context, IReadOnlyList<Reaction> reactions)
+        {
+            if (!reactions.Any())
+                return "";
+
+            var buffer = new StringBuilder();
+
+            buffer.AppendLine("{Reactions}");
+
+            foreach (var reaction in reactions)
+            {
+                buffer.Append(reaction.Emoji.Name);
+
+                if (reaction.Count > 1)
+                    buffer.Append($" ({reaction.Count})");
+
+                buffer.Append(" ");
+            }
+
+            buffer.AppendLine();
+
+            return buffer.ToString();
+        }
+
+        public static string FormatMessage(RenderContext context, Message message)
+        {
+            var buffer = new StringBuilder();
+
+            buffer
+                .AppendLine(FormatMessageHeader(context, message))
+                .AppendLineIfNotEmpty(FormatMessageContent(context, message))
+                .AppendLine()
+                .AppendLineIfNotEmpty(FormatAttachments(context, message.Attachments))
+                .AppendLineIfNotEmpty(FormatEmbeds(context, message.Embeds))
+                .AppendLineIfNotEmpty(FormatReactions(context, message.Reactions));
+
+            return buffer.Trim().ToString();
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/Logic/SharedRenderingLogic.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Globalization;
+
+namespace DiscordChatExporter.Core.Rendering.Logic
+{
+    public static class SharedRenderingLogic
+    {
+        public static string FormatDate(DateTimeOffset date, string dateFormat) =>
+            date.ToLocalTime().ToString(dateFormat, CultureInfo.InvariantCulture);
+    }
+}

DiscordChatExporter.Core.Rendering/MessageRendererBase.cs

@@ -0,0 +1,23 @@
+using System.IO;
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public abstract class MessageRendererBase : IMessageRenderer
+    {
+        protected TextWriter Writer { get; }
+
+        protected RenderContext Context { get; }
+
+        protected MessageRendererBase(string filePath, RenderContext context)
+        {
+            Writer = File.CreateText(filePath);
+            Context = context;
+        }
+
+        public abstract Task RenderMessageAsync(Message message);
+
+        public virtual ValueTask DisposeAsync() => Writer.DisposeAsync();
+    }
+}

DiscordChatExporter.Core.Rendering/PlainTextChatLogRenderer.cs

@@ -1,237 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
-using DiscordChatExporter.Core.Markdown;
-using DiscordChatExporter.Core.Markdown.Nodes;
-using DiscordChatExporter.Core.Models;
-using Tyrrrz.Extensions;
-
-namespace DiscordChatExporter.Core.Rendering
-{
-    public class PlainTextChatLogRenderer : IChatLogRenderer
-    {
-        private readonly ChatLog _chatLog;
-        private readonly string _dateFormat;
-
-        public PlainTextChatLogRenderer(ChatLog chatLog, string dateFormat)
-        {
-            _chatLog = chatLog;
-            _dateFormat = dateFormat;
-        }
-
-        private string FormatDate(DateTimeOffset date) =>
-            date.ToLocalTime().ToString(_dateFormat, CultureInfo.InvariantCulture);
-
-        private string FormatDateRange(DateTimeOffset? after, DateTimeOffset? before)
-        {
-            // Both 'after' and 'before'
-            if (after != null && before != null)
-                return $"{FormatDate(after.Value)} to {FormatDate(before.Value)}";
-
-            // Just 'after'
-            if (after != null)
-                return $"after {FormatDate(after.Value)}";
-
-            // Just 'before'
-            if (before != null)
-                return $"before {FormatDate(before.Value)}";
-
-            // Neither
-            return "";
-        }
-
-        private string FormatMarkdown(Node node)
-        {
-            // Text node
-            if (node is TextNode textNode)
-            {
-                return textNode.Text;
-            }
-
-            // Mention node
-            if (node is MentionNode mentionNode)
-            {
-                // Meta mention node
-                if (mentionNode.Type == MentionType.Meta)
-                {
-                    return mentionNode.Id;
-                }
-
-                // User mention node
-                if (mentionNode.Type == MentionType.User)
-                {
-                    var user = _chatLog.Mentionables.GetUser(mentionNode.Id);
-                    return $"@{user.Name}";
-                }
-
-                // Channel mention node
-                if (mentionNode.Type == MentionType.Channel)
-                {
-                    var channel = _chatLog.Mentionables.GetChannel(mentionNode.Id);
-                    return $"#{channel.Name}";
-                }
-
-                // Role mention node
-                if (mentionNode.Type == MentionType.Role)
-                {
-                    var role = _chatLog.Mentionables.GetRole(mentionNode.Id);
-                    return $"@{role.Name}";
-                }
-            }
-
-            // Emoji node
-            if (node is EmojiNode emojiNode)
-            {
-                return emojiNode.IsCustomEmoji ? $":{emojiNode.Name}:" : emojiNode.Name;
-            }
-
-            // Throw on unexpected nodes
-            throw new InvalidOperationException($"Unexpected node: [{node.GetType()}].");
-        }
-
-        private string FormatMarkdown(IEnumerable<Node> nodes) => nodes.Select(FormatMarkdown).JoinToString("");
-
-        private string FormatMarkdown(string markdown) => FormatMarkdown(MarkdownParser.ParseMinimal(markdown));
-
-        private async Task RenderMessageHeaderAsync(TextWriter writer, Message message)
-        {
-            // Timestamp
-            await writer.WriteAsync($"[{FormatDate(message.Timestamp)}]");
-
-            // Author
-            await writer.WriteAsync($" {message.Author.FullName}");
-
-            // Whether the message is pinned
-            if (message.IsPinned)
-                await writer.WriteAsync(" (pinned)");
-
-            await writer.WriteLineAsync();
-        }
-
-        private async Task RenderAttachmentsAsync(TextWriter writer, IReadOnlyList<Attachment> attachments)
-        {
-            if (attachments.Any())
-            {
-                await writer.WriteLineAsync("{Attachments}");
-
-                foreach (var attachment in attachments)
-                    await writer.WriteLineAsync(attachment.Url);
-
-                await writer.WriteLineAsync();
-            }
-        }
-
-        private async Task RenderEmbedsAsync(TextWriter writer, IReadOnlyList<Embed> embeds)
-        {
-            foreach (var embed in embeds)
-            {
-                await writer.WriteLineAsync("{Embed}");
-
-                // Author name
-                if (!string.IsNullOrWhiteSpace(embed.Author?.Name))
-                    await writer.WriteLineAsync(embed.Author?.Name);
-
-                // URL
-                if (!string.IsNullOrWhiteSpace(embed.Url))
-                    await writer.WriteLineAsync(embed.Url);
-
-                // Title
-                if (!string.IsNullOrWhiteSpace(embed.Title))
-                    await writer.WriteLineAsync(FormatMarkdown(embed.Title));
-
-                // Description
-                if (!string.IsNullOrWhiteSpace(embed.Description))
-                    await writer.WriteLineAsync(FormatMarkdown(embed.Description));
-
-                // Fields
-                foreach (var field in embed.Fields)
-                {
-                    // Name
-                    if (!string.IsNullOrWhiteSpace(field.Name))
-                        await writer.WriteLineAsync(field.Name);
-
-                    // Value
-                    if (!string.IsNullOrWhiteSpace(field.Value))
-                        await writer.WriteLineAsync(field.Value);
-                }
-
-                // Thumbnail URL
-                if (!string.IsNullOrWhiteSpace(embed.Thumbnail?.Url))
-                    await writer.WriteLineAsync(embed.Thumbnail?.Url);
-
-                // Image URL
-                if (!string.IsNullOrWhiteSpace(embed.Image?.Url))
-                    await writer.WriteLineAsync(embed.Image?.Url);
-
-                // Footer text
-                if (!string.IsNullOrWhiteSpace(embed.Footer?.Text))
-                    await writer.WriteLineAsync(embed.Footer?.Text);
-
-                await writer.WriteLineAsync();
-            }
-        }
-
-        private async Task RenderReactionsAsync(TextWriter writer, IReadOnlyList<Reaction> reactions)
-        {
-            if (reactions.Any())
-            {
-                await writer.WriteLineAsync("{Reactions}");
-
-                foreach (var reaction in reactions)
-                {
-                    await writer.WriteAsync(reaction.Emoji.Name);
-
-                    if (reaction.Count > 1)
-                        await writer.WriteAsync($" ({reaction.Count})");
-
-                    await writer.WriteAsync(" ");
-                }
-
-                await writer.WriteLineAsync();
-                await writer.WriteLineAsync();
-            }
-        }
-
-        private async Task RenderMessageAsync(TextWriter writer, Message message)
-        {
-            // Header
-            await RenderMessageHeaderAsync(writer, message);
-
-            // Content
-            if (!string.IsNullOrWhiteSpace(message.Content))
-                await writer.WriteLineAsync(FormatMarkdown(message.Content));
-
-            // Separator
-            await writer.WriteLineAsync();
-
-            // Attachments
-            await RenderAttachmentsAsync(writer, message.Attachments);
-
-            // Embeds
-            await RenderEmbedsAsync(writer, message.Embeds);
-
-            // Reactions
-            await RenderReactionsAsync(writer, message.Reactions);
-        }
-
-        public async Task RenderAsync(TextWriter writer)
-        {
-            // Metadata
-            await writer.WriteLineAsync('='.Repeat(62));
-            await writer.WriteLineAsync($"Guild: {_chatLog.Guild.Name}");
-            await writer.WriteLineAsync($"Channel: {_chatLog.Channel.Name}");
-            await writer.WriteLineAsync($"Topic: {_chatLog.Channel.Topic}");
-            await writer.WriteLineAsync($"Messages: {_chatLog.Messages.Count:N0}");
-            await writer.WriteLineAsync($"Range: {FormatDateRange(_chatLog.After, _chatLog.Before)}");
-            await writer.WriteLineAsync('='.Repeat(62));
-            await writer.WriteLineAsync();
-
-            // Log
-            foreach (var message in _chatLog.Messages)
-                await RenderMessageAsync(writer, message);
-        }
-    }
-}

DiscordChatExporter.Core.Rendering/PlainTextMessageRenderer.cs

@@ -0,0 +1,29 @@
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Models;
+using DiscordChatExporter.Core.Rendering.Logic;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public class PlainTextMessageRenderer : MessageRendererBase
+    {
+        private bool _isPreambleRendered;
+
+        public PlainTextMessageRenderer(string filePath, RenderContext context)
+            : base(filePath, context)
+        {
+        }
+
+        public override async Task RenderMessageAsync(Message message)
+        {
+            // Render preamble if it's the first entry
+            if (!_isPreambleRendered)
+            {
+                await Writer.WriteLineAsync(PlainTextRenderingLogic.FormatPreamble(Context));
+                _isPreambleRendered = true;
+            }
+
+            await Writer.WriteLineAsync(PlainTextRenderingLogic.FormatMessage(Context, message));
+            await Writer.WriteLineAsync();
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/RenderContext.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using DiscordChatExporter.Core.Models;
+
+namespace DiscordChatExporter.Core.Rendering
+{
+    public class RenderContext
+    {
+        public Guild Guild { get; }
+
+        public Channel Channel { get; }
+
+        public DateTimeOffset? After { get; }
+
+        public DateTimeOffset? Before { get; }
+
+        public string DateFormat { get; }
+
+        public IReadOnlyCollection<User> MentionableUsers { get; }
+
+        public IReadOnlyCollection<Channel> MentionableChannels { get; }
+
+        public IReadOnlyCollection<Role> MentionableRoles { get; }
+
+        public RenderContext(Guild guild, Channel channel, DateTimeOffset? after, DateTimeOffset? before, string dateFormat,
+            IReadOnlyCollection<User> mentionableUsers, IReadOnlyCollection<Channel> mentionableChannels, IReadOnlyCollection<Role> mentionableRoles)
+        {
+            Guild = guild;
+            Channel = channel;
+            After = after;
+            Before = before;
+            DateFormat = dateFormat;
+            MentionableUsers = mentionableUsers;
+            MentionableChannels = mentionableChannels;
+            MentionableRoles = mentionableRoles;
+        }
+    }
+}

DiscordChatExporter.Core.Rendering/Resources/HtmlCore.css

@@ -358,6 +358,7 @@ img {
     background: #7289da;
     color: #ffffff;
     font-size: 0.625em;
+    font-weight: 500;
     padding: 1px 2px;
     border-radius: 3px;
     vertical-align: middle;

DiscordChatExporter.Core.Rendering/Resources/HtmlDark.css

@@ -23,7 +23,7 @@ a {
 
 .pre--multiline {
     border-color: #282b30 !important;
-    color: #839496 !important;
+    color: #b9bbbe !important;
 }
 
 .mention {

DiscordChatExporter.Core.Rendering/Resources/HtmlDark.html

@@ -1,3 +0,0 @@
-{{~ ThemeStyleSheet = include "HtmlDark.css" ~}}
-{{~ HighlightJsStyleName = "solarized-dark" ~}}
-{{~ include "HtmlShared.html" ~}}

DiscordChatExporter.Core.Rendering/Resources/HtmlLayoutTemplate.html

@@ -0,0 +1,84 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    {{~ # Metadata ~}}
+    <title>{{ Context.Guild.Name | html.escape }} - {{ Context.Channel.Name | html.escape }}</title>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width" />
+
+    {{~ # Styles ~}}
+    <style>
+        {{ CoreStyleSheet }}
+    </style>
+    <style>
+        {{ ThemeStyleSheet }}
+    </style>
+
+    {{~ # Syntax highlighting ~}}
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/{{HighlightJsStyleName}}.min.css">
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/highlight.min.js"></script>
+    <script>
+        document.addEventListener('DOMContentLoaded', () => {
+            document.querySelectorAll('.pre--multiline').forEach(block => hljs.highlightBlock(block));
+        });
+    </script>
+
+    {{~ # Local scripts ~}}
+    <script>
+        function scrollToMessage(event, id) {
+            var element = document.getElementById('message-' + id);
+
+            if (element) {
+                event.preventDefault();
+
+                element.classList.add('chatlog__message--highlighted');
+
+                window.scrollTo({
+                    top: element.getBoundingClientRect().top - document.body.getBoundingClientRect().top - (window.innerHeight / 2),
+                    behavior: 'smooth'
+                });
+
+                window.setTimeout(function() {
+                    element.classList.remove('chatlog__message--highlighted');
+                }, 2000);
+            }
+        }
+    </script>
+</head>
+<body>
+
+{{~ # Info ~}}
+<div class="info">
+    <div class="info__guild-icon-container">
+        <img class="info__guild-icon" src="{{ Context.Guild.IconUrl }}" />
+    </div>
+    <div class="info__metadata">
+        <div class="info__guild-name">{{ Context.Guild.Name | html.escape }}</div>
+        <div class="info__channel-name">{{ Context.Channel.Name | html.escape }}</div>
+
+        {{~ if Context.Channel.Topic ~}}
+            <div class="info__channel-topic">{{ Context.Channel.Topic | html.escape }}</div>
+        {{~ end ~}}
+
+        {{~ if Context.After || Context.Before ~}}
+            <div class="info__channel-date-range">
+                {{~ if Context.After && Context.Before ~}}
+                    Between {{ Context.After | FormatDate | html.escape }} and {{ Context.Before | FormatDate | html.escape }}
+                {{~ else if Context.After ~}}
+                    After {{ Context.After | FormatDate | html.escape }}
+                {{~ else if Context.Before ~}}
+                    Before {{ Context.Before | FormatDate | html.escape }}
+                {{~ end ~}}
+            </div>
+        {{~ end ~}}
+    </div>
+</div>
+
+{{~ # Log ~}}
+<div class="chatlog">
+    {{~ %SPLIT% ~}}
+</div>
+
+</body>
+</html>

DiscordChatExporter.Core.Rendering/Resources/HtmlLight.html

@@ -1,3 +0,0 @@
-{{~ ThemeStyleSheet = include "HtmlLight.css" ~}}
-{{~ HighlightJsStyleName = "solarized-light" ~}}
-{{~ include "HtmlShared.html" ~}}

DiscordChatExporter.Core.Rendering/Resources/HtmlMessageGroupTemplate.html

@@ -0,0 +1,170 @@
+<div class="chatlog__message-group">
+    {{~ # Avatar ~}}
+    <div class="chatlog__author-avatar-container">
+        <img class="chatlog__author-avatar" src="{{ MessageGroup.Author.AvatarUrl }}" />
+    </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>
+
+        {{~ # Bot tag ~}}
+        {{~ if MessageGroup.Author.IsBot ~}}
+            <span class="chatlog__bot-tag">BOT</span>
+        {{~ end ~}}
+
+        <span class="chatlog__timestamp">{{ MessageGroup.Timestamp | FormatDate | html.escape }}</span>
+
+        {{~ # Messages ~}}
+        {{~ for message in MessageGroup.Messages ~}}
+            <div class="chatlog__message {{if message.IsPinned }}chatlog__message--pinned{{ end }}" data-message-id="{{ message.Id }}" id="message-{{ message.Id }}">
+            {{~ # Content ~}}
+            {{~ if message.Content ~}}
+                <div class="chatlog__content">
+                    <span class="markdown">{{ message.Content | FormatMarkdown }}</span>
+
+                    {{~ # Edited timestamp ~}}
+                    {{~ if message.EditedTimestamp ~}}
+                        <span class="chatlog__edited-timestamp" title="{{ message.EditedTimestamp | FormatDate | html.escape }}">(edited)</span>
+                    {{~ end ~}}
+                </div>
+            {{~ end ~}}
+
+            {{~ # Attachments ~}}
+            {{~ for attachment in message.Attachments ~}}
+                <div class="chatlog__attachment">
+                    <a href="{{ attachment.Url }}">
+                        {{ # Image }}
+                        {{~ if attachment.IsImage ~}}
+                            <img class="chatlog__attachment-thumbnail" src="{{ attachment.Url }}" />
+                        {{~ # Non-image ~}}
+                        {{~ else ~}}
+                            Attachment: {{ attachment.FileName }} ({{ attachment.FileSize }})
+                        {{~ end ~}}
+                    </a>
+                </div>
+            {{~ end ~}}
+
+            {{~ # Embeds ~}}
+            {{~ for embed in message.Embeds ~}}
+            <div class="chatlog__embed">
+                {{~ if embed.Color ~}}
+                <div class="chatlog__embed-color-pill" style="background-color: rgba({{ embed.Color.R }},{{ embed.Color.G }},{{ embed.Color.B }},{{ embed.Color.A }})"></div>
+                {{~ else ~}}
+                <div class="chatlog__embed-color-pill chatlog__embed-color-pill--default"></div>
+                {{~ end ~}}
+                <div class="chatlog__embed-content-container">
+                    <div class="chatlog__embed-content">
+                        <div class="chatlog__embed-text">
+                            {{~ # Author ~}}
+                            {{~ if embed.Author ~}}
+                            <div class="chatlog__embed-author">
+                                {{~ if embed.Author.IconUrl ~}}
+                                <img class="chatlog__embed-author-icon" src="{{ embed.Author.IconUrl }}" />
+                                {{~ end ~}}
+
+                                {{~ if embed.Author.Name ~}}
+                                <span class="chatlog__embed-author-name">
+                                    {{~ if embed.Author.Url ~}}
+                                    <a class="chatlog__embed-author-name-link" href="{{ embed.Author.Url }}">{{ embed.Author.Name | html.escape }}</a>
+                                    {{~ else ~}}
+                                    {{ embed.Author.Name | html.escape }}
+                                    {{~ end ~}}
+                                </span>
+                                {{~ end ~}}
+                            </div>
+                            {{~ end ~}}
+
+                            {{~ # Title ~}}
+                            {{~ if embed.Title ~}}
+                            <div class="chatlog__embed-title">
+                                {{~ if embed.Url ~}}
+                                <a class="chatlog__embed-title-link" href="{{ embed.Url }}"><span class="markdown">{{ embed.Title | FormatMarkdown }}</span></a>
+                                {{~ else ~}}
+                                <span class="markdown">{{ embed.Title | FormatMarkdown }}</span>
+                                {{~ end ~}}
+                            </div>
+                            {{~ end ~}}
+
+                            {{~ # Description ~}}
+                            {{~ if embed.Description ~}}
+                            <div class="chatlog__embed-description"><span class="markdown">{{ embed.Description | FormatMarkdown }}</span></div>
+                            {{~ end ~}}
+
+                            {{~ # Fields ~}}
+                            {{~ if embed.Fields | array.size > 0 ~}}
+                            <div class="chatlog__embed-fields">
+                                {{~ for field in embed.Fields ~}}
+                                <div class="chatlog__embed-field {{ if field.IsInline }} chatlog__embed-field--inline {{ end }}">
+                                    {{~ if field.Name ~}}
+                                    <div class="chatlog__embed-field-name"><span class="markdown">{{ field.Name | FormatMarkdown }}</span></div>
+                                    {{~ end ~}}
+                                    {{~ if field.Value ~}}
+                                    <div class="chatlog__embed-field-value"><span class="markdown">{{ field.Value | FormatMarkdown }}</span></div>
+                                    {{~ end ~}}
+                                </div>
+                                {{~ end ~}}
+                            </div>
+                            {{~ end ~}}
+                        </div>
+
+                        {{~ # Thumbnail ~}}
+                        {{~ if embed.Thumbnail ~}}
+                        <div class="chatlog__embed-thumbnail-container">
+                            <a class="chatlog__embed-thumbnail-link" href="{{ embed.Thumbnail.Url }}">
+                                <img class="chatlog__embed-thumbnail" src="{{ embed.Thumbnail.Url }}" />
+                            </a>
+                        </div>
+                        {{~ end ~}}
+                    </div>
+
+                    {{~ # Image ~}}
+                    {{~ if embed.Image ~}}
+                    <div class="chatlog__embed-image-container">
+                        <a class="chatlog__embed-image-link" href="{{ embed.Image.Url }}">
+                            <img class="chatlog__embed-image" src="{{ embed.Image.Url }}" />
+                        </a>
+                    </div>
+                    {{~ end ~}}
+
+                    {{~ # Footer ~}}
+                    {{~ if embed.Footer || embed.Timestamp ~}}
+                    <div class="chatlog__embed-footer">
+                        {{~ if embed.Footer ~}}
+                        {{~ if embed.Footer.Text && embed.Footer.IconUrl ~}}
+                        <img class="chatlog__embed-footer-icon" src="{{ embed.Footer.IconUrl }}" />
+                        {{~ end ~}}
+                        {{~ end ~}}
+
+                        <span class="chatlog__embed-footer-text">
+                            {{~ if embed.Footer ~}}
+                            {{~ if embed.Footer.Text ~}}
+                            {{ embed.Footer.Text | html.escape }}
+                            {{ if embed.Timestamp }} • {{ end }}
+                            {{~ end ~}}
+                            {{~ end ~}}
+
+                            {{~ if embed.Timestamp ~}}
+                            {{ embed.Timestamp | FormatDate | html.escape }}
+                            {{~ end ~}}
+                        </span>
+                    </div>
+                    {{~ end ~}}
+                </div>
+            </div>
+            {{~ end ~}}
+
+            {{~ # Reactions ~}}
+            {{~ if message.Reactions | array.size > 0 ~}}
+                <div class="chatlog__reactions">
+                    {{~ for reaction in message.Reactions ~}}
+                        <div class="chatlog__reaction">
+                            <img class="emoji emoji--small" alt="{{ reaction.Emoji.Name }}" title="{{ reaction.Emoji.Name }}" src="{{ reaction.Emoji.ImageUrl }}" />
+                            <span class="chatlog__reaction-count">{{ reaction.Count }}</span>
+                        </div>
+                    {{~ end ~}}
+                </div>
+            {{~ end ~}}
+            </div>
+        {{~ end ~}}
+    </div>
+</div>

DiscordChatExporter.Core.Rendering/Resources/HtmlShared.html

@@ -1,259 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-
-<head>
-    {{~ # Metadata ~}}
-    <title>{{ Model.Guild.Name | html.escape }} - {{ Model.Channel.Name | html.escape }}</title>
-    <meta charset="utf-8" />
-    <meta name="viewport" content="width=device-width" />
-
-    {{~ # Styles ~}}
-    <style>
-        {{ include "HtmlShared.css" }}
-    </style>
-    <style>
-        {{ ThemeStyleSheet }}
-    </style>
-
-    {{~ # Syntax highlighting ~}}
-    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/{{HighlightJsStyleName}}.min.css">
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/highlight.min.js"></script>
-    <script>
-        document.addEventListener('DOMContentLoaded', () => {
-            document.querySelectorAll('.pre--multiline').forEach((block) => {
-                hljs.highlightBlock(block);
-            });
-        });
-    </script>
-
-    {{~ # Local scripts ~}}
-    <script>
-        function scrollToMessage(event, id) {
-            var element = document.getElementById('message-' + id);
-
-            if (element) {
-                event.preventDefault();
-
-                element.classList.add('chatlog__message--highlighted');
-
-                window.scrollTo({
-                    top: element.getBoundingClientRect().top - document.body.getBoundingClientRect().top - (window.innerHeight / 2),
-                    behavior: 'smooth'
-                });
-
-                window.setTimeout(function() {
-                    element.classList.remove('chatlog__message--highlighted');
-                }, 2000);
-            }
-        }
-    </script>
-</head>
-<body>
-
-{{~ # Info ~}}
-<div class="info">
-    <div class="info__guild-icon-container">
-        <img class="info__guild-icon" src="{{ Model.Guild.IconUrl }}" />
-    </div>
-    <div class="info__metadata">
-        <div class="info__guild-name">{{ Model.Guild.Name | html.escape }}</div>
-        <div class="info__channel-name">{{ Model.Channel.Name | html.escape }}</div>
-
-        {{~ if Model.Channel.Topic ~}}
-            <div class="info__channel-topic">{{ Model.Channel.Topic | html.escape }}</div>
-        {{~ end ~}}
-
-        <div class="info__channel-message-count">{{ Model.Messages | array.size | object.format "N0" }} messages</div>
-
-        {{~ if Model.After || Model.Before ~}}
-            <div class="info__channel-date-range">
-                {{~ if Model.After && Model.Before ~}}
-                    Between {{ Model.After | FormatDate | html.escape }} and {{ Model.Before | FormatDate | html.escape }}
-                {{~ else if Model.After ~}}
-                    After {{ Model.After | FormatDate | html.escape }}
-                {{~ else if Model.Before ~}}
-                    Before {{ Model.Before | FormatDate | html.escape }}
-                {{~ end ~}}
-            </div>
-        {{~ end ~}}
-    </div>
-</div>
-
-{{~ # Log ~}}
-<div class="chatlog">
-    {{~ for group in Model.Messages | GroupMessages ~}}
-        <div class="chatlog__message-group">
-            {{~ # Avatar ~}}
-            <div class="chatlog__author-avatar-container">
-                <img class="chatlog__author-avatar" src="{{ group.Author.AvatarUrl }}" />
-            </div>
-            <div class="chatlog__messages">
-                {{~ # Author name and timestamp ~}}
-                <span class="chatlog__author-name" title="{{ group.Author.FullName | html.escape }}" data-user-id="{{ group.Author.Id | html.escape }}">{{ group.Author.Name | html.escape }}</span>
-
-                {{~ # Bot tag ~}}
-                {{~ if group.Author.IsBot ~}}
-                    <span class="chatlog__bot-tag">BOT</span>
-                {{~ end ~}}
-
-                <span class="chatlog__timestamp">{{ group.Timestamp | FormatDate | html.escape }}</span>
-
-                {{~ # Messages ~}}
-                {{~ for message in group.Messages ~}}
-                    <div class="chatlog__message {{if message.IsPinned }}chatlog__message--pinned{{ end }}" data-message-id="{{ message.Id }}" id="message-{{ message.Id }}">
-                    {{~ # Content ~}}
-                    {{~ if message.Content ~}}
-                        <div class="chatlog__content">
-                            <span class="markdown">{{ message.Content | FormatMarkdown }}</span>
-
-                            {{~ # Edited timestamp ~}}
-                            {{~ if message.EditedTimestamp ~}}
-                                <span class="chatlog__edited-timestamp" title="{{ message.EditedTimestamp | FormatDate | html.escape }}">(edited)</span>
-                            {{~ end ~}}
-                        </div>
-                    {{~ end ~}}
-
-                    {{~ # Attachments ~}}
-                    {{~ for attachment in message.Attachments ~}}
-                        <div class="chatlog__attachment">
-                            <a href="{{ attachment.Url }}">
-                                {{ # Image }}
-                                {{~ if attachment.IsImage ~}}
-                                    <img class="chatlog__attachment-thumbnail" src="{{ attachment.Url }}" />
-                                {{~ # Non-image ~}}
-                                {{~ else ~}}
-                                    Attachment: {{ attachment.FileName }} ({{ attachment.FileSize }})
-                                {{~ end ~}}
-                            </a>
-                        </div>
-                    {{~ end ~}}
-
-                    {{~ # Embeds ~}}
-                    {{~ for embed in message.Embeds ~}}
-                    <div class="chatlog__embed">
-                        {{~ if embed.Color ~}}
-                        <div class="chatlog__embed-color-pill" style="background-color: rgba({{ embed.Color.R }},{{ embed.Color.G }},{{ embed.Color.B }},{{ embed.Color.A }})"></div>
-                        {{~ else ~}}
-                        <div class="chatlog__embed-color-pill chatlog__embed-color-pill--default"></div>
-                        {{~ end ~}}
-                        <div class="chatlog__embed-content-container">
-                            <div class="chatlog__embed-content">
-                                <div class="chatlog__embed-text">
-                                    {{~ # Author ~}}
-                                    {{~ if embed.Author ~}}
-                                    <div class="chatlog__embed-author">
-                                        {{~ if embed.Author.IconUrl ~}}
-                                        <img class="chatlog__embed-author-icon" src="{{ embed.Author.IconUrl }}" />
-                                        {{~ end ~}}
-
-                                        {{~ if embed.Author.Name ~}}
-                                        <span class="chatlog__embed-author-name">
-                                            {{~ if embed.Author.Url ~}}
-                                            <a class="chatlog__embed-author-name-link" href="{{ embed.Author.Url }}">{{ embed.Author.Name | html.escape }}</a>
-                                            {{~ else ~}}
-                                            {{ embed.Author.Name | html.escape }}
-                                            {{~ end ~}}
-                                        </span>
-                                        {{~ end ~}}
-                                    </div>
-                                    {{~ end ~}}
-
-                                    {{~ # Title ~}}
-                                    {{~ if embed.Title ~}}
-                                    <div class="chatlog__embed-title">
-                                        {{~ if embed.Url ~}}
-                                        <a class="chatlog__embed-title-link" href="{{ embed.Url }}"><span class="markdown">{{ embed.Title | FormatMarkdown }}</span></a>
-                                        {{~ else ~}}
-                                        <span class="markdown">{{ embed.Title | FormatMarkdown }}</span>
-                                        {{~ end ~}}
-                                    </div>
-                                    {{~ end ~}}
-
-                                    {{~ # Description ~}}
-                                    {{~ if embed.Description ~}}
-                                    <div class="chatlog__embed-description"><span class="markdown">{{ embed.Description | FormatMarkdown }}</span></div>
-                                    {{~ end ~}}
-
-                                    {{~ # Fields ~}}
-                                    {{~ if embed.Fields | array.size > 0 ~}}
-                                    <div class="chatlog__embed-fields">
-                                        {{~ for field in embed.Fields ~}}
-                                        <div class="chatlog__embed-field {{ if field.IsInline }} chatlog__embed-field--inline {{ end }}">
-                                            {{~ if field.Name ~}}
-                                            <div class="chatlog__embed-field-name"><span class="markdown">{{ field.Name | FormatMarkdown }}</span></div>
-                                            {{~ end ~}}
-                                            {{~ if field.Value ~}}
-                                            <div class="chatlog__embed-field-value"><span class="markdown">{{ field.Value | FormatMarkdown }}</span></div>
-                                            {{~ end ~}}
-                                        </div>
-                                        {{~ end ~}}
-                                    </div>
-                                    {{~ end ~}}
-                                </div>
-
-                                {{~ # Thumbnail ~}}
-                                {{~ if embed.Thumbnail ~}}
-                                <div class="chatlog__embed-thumbnail-container">
-                                    <a class="chatlog__embed-thumbnail-link" href="{{ embed.Thumbnail.Url }}">
-                                        <img class="chatlog__embed-thumbnail" src="{{ embed.Thumbnail.Url }}" />
-                                    </a>
-                                </div>
-                                {{~ end ~}}
-                            </div>
-
-                            {{~ # Image ~}}
-                            {{~ if embed.Image ~}}
-                            <div class="chatlog__embed-image-container">
-                                <a class="chatlog__embed-image-link" href="{{ embed.Image.Url }}">
-                                    <img class="chatlog__embed-image" src="{{ embed.Image.Url }}" />
-                                </a>
-                            </div>
-                            {{~ end ~}}
-
-                            {{~ # Footer ~}}
-                            {{~ if embed.Footer || embed.Timestamp ~}}
-                            <div class="chatlog__embed-footer">
-                                {{~ if embed.Footer ~}}
-                                {{~ if embed.Footer.Text && embed.Footer.IconUrl ~}}
-                                <img class="chatlog__embed-footer-icon" src="{{ embed.Footer.IconUrl }}" />
-                                {{~ end ~}}
-                                {{~ end ~}}
-
-                                <span class="chatlog__embed-footer-text">
-                                    {{~ if embed.Footer ~}}
-                                    {{~ if embed.Footer.Text ~}}
-                                    {{ embed.Footer.Text | html.escape }}
-                                    {{ if embed.Timestamp }} • {{ end }}
-                                    {{~ end ~}}
-                                    {{~ end ~}}
-
-                                    {{~ if embed.Timestamp ~}}
-                                    {{ embed.Timestamp | FormatDate | html.escape }}
-                                    {{~ end ~}}
-                                </span>
-                            </div>
-                            {{~ end ~}}
-                        </div>
-                    </div>
-                    {{~ end ~}}
-
-                    {{~ # Reactions ~}}
-                    {{~ if message.Reactions | array.size > 0 ~}}
-                        <div class="chatlog__reactions">
-                            {{~ for reaction in message.Reactions ~}}
-                                <div class="chatlog__reaction">
-                                    <img class="emoji emoji--small" alt="{{ reaction.Emoji.Name }}" title="{{ reaction.Emoji.Name }}" src="{{ reaction.Emoji.ImageUrl }}" />
-                                    <span class="chatlog__reaction-count">{{ reaction.Count }}</span>
-                                </div>
-                            {{~ end ~}}
-                        </div>
-                    {{~ end ~}}
-                    </div>
-                {{~ end ~}}
-            </div>
-        </div>
-    {{~ end ~}}
-</div>
-
-</body>
-</html>

DiscordChatExporter.Core.Services/DataService.Parsers.cs

@@ -203,14 +203,14 @@ namespace DiscordChatExporter.Core.Services
             // Get reactions
             var reactions = (json["reactions"] ?? Enumerable.Empty<JToken>()).Select(ParseReaction).ToArray();
 
-            // Get mentioned users
+            // Get mentions
             var mentionedUsers = (json["mentions"] ?? Enumerable.Empty<JToken>()).Select(ParseUser).ToArray();
 
             // Get whether this message is pinned
             var isPinned = json["pinned"]!.Value<bool>();
 
-            return new Message(id, channelId, type, author, timestamp, editedTimestamp, content, attachments, embeds,
+            return new Message(id, channelId, type, author, timestamp, editedTimestamp, isPinned, content, attachments, embeds,
-                reactions, mentionedUsers, isPinned);
+                reactions, mentionedUsers);
         }
     }
 }

DiscordChatExporter.Core.Services/DataService.cs

@@ -82,7 +82,7 @@ namespace DiscordChatExporter.Core.Services
             return channel;
         }
 
-        public async IAsyncEnumerable<Guild> EnumerateUserGuildsAsync(AuthToken token)
+        public async IAsyncEnumerable<Guild> GetUserGuildsAsync(AuthToken token)
         {
             var afterId = "";
 
@@ -105,8 +105,6 @@ namespace DiscordChatExporter.Core.Services
             }
         }
 
-        public Task<IReadOnlyList<Guild>> GetUserGuildsAsync(AuthToken token) => EnumerateUserGuildsAsync(token).AggregateAsync();
-
         public async Task<IReadOnlyList<Channel>> GetDirectMessageChannelsAsync(AuthToken token)
         {
             var response = await GetApiResponseAsync(token, "users/@me/channels");
@@ -117,6 +115,10 @@ namespace DiscordChatExporter.Core.Services
 
         public async Task<IReadOnlyList<Channel>> GetGuildChannelsAsync(AuthToken token, string guildId)
         {
+            // Special case for direct messages pseudo-guild
+            if (guildId == Guild.DirectMessages.Id)
+                return Array.Empty<Channel>();
+
             var response = await GetApiResponseAsync(token, $"guilds/{guildId}/channels");
             var channels = response.Select(ParseChannel).ToArray();
 
@@ -125,6 +127,10 @@ namespace DiscordChatExporter.Core.Services
 
         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();
 
@@ -142,7 +148,7 @@ namespace DiscordChatExporter.Core.Services
             return response.Select(ParseMessage).FirstOrDefault();
         }
 
-        public async IAsyncEnumerable<Message> EnumerateMessagesAsync(AuthToken token, string channelId,
+        public async IAsyncEnumerable<Message> GetMessagesAsync(AuthToken token, string channelId,
             DateTimeOffset? after = null, DateTimeOffset? before = null, IProgress<double>? progress = null)
         {
             // Get the last message
@@ -157,11 +163,11 @@ namespace DiscordChatExporter.Core.Services
 
             // Get other messages
             var firstMessage = default(Message);
-            var offsetId = after?.ToSnowflake() ?? "0";
+            var afterId = after?.ToSnowflake() ?? "0";
             while (true)
             {
                 // Get message batch
-                var route = $"channels/{channelId}/messages?limit=100&after={offsetId}";
+                var route = $"channels/{channelId}/messages?limit=100&after={afterId}";
                 var response = await GetApiResponseAsync(token, route);
 
                 // Parse
@@ -190,7 +196,7 @@ namespace DiscordChatExporter.Core.Services
                                      (lastMessage.Timestamp - firstMessage.Timestamp).TotalSeconds);
 
                     yield return message;
-                    offsetId = message.Id;
+                    afterId = message.Id;
                 }
 
                 // Break if messages were trimmed (which means the last message was encountered)
@@ -200,67 +206,9 @@ namespace DiscordChatExporter.Core.Services
 
             // Yield last message
             yield return lastMessage;
-
-            // Report progress
             progress?.Report(1);
         }
 
-        public Task<IReadOnlyList<Message>> GetMessagesAsync(AuthToken token, string channelId,
-            DateTimeOffset? after = null, DateTimeOffset? before = null, IProgress<double>? progress = null) =>
-            EnumerateMessagesAsync(token, channelId, after, before, progress).AggregateAsync();
-
-        public async Task<Mentionables> GetMentionablesAsync(AuthToken token, string guildId,
-            IEnumerable<Message> messages)
-        {
-            // Get channels and roles
-            var channels = guildId != Guild.DirectMessages.Id
-                ? await GetGuildChannelsAsync(token, guildId)
-                : Array.Empty<Channel>();
-            var roles = guildId != Guild.DirectMessages.Id
-                ? await GetGuildRolesAsync(token, guildId)
-                : Array.Empty<Role>();
-
-            // Get users
-            var userMap = new Dictionary<string, User>();
-            foreach (var message in messages)
-            {
-                // Author
-                userMap[message.Author.Id] = message.Author;
-
-                // Mentioned users
-                foreach (var mentionedUser in message.MentionedUsers)
-                    userMap[mentionedUser.Id] = mentionedUser;
-            }
-
-            var users = userMap.Values.ToArray();
-
-            return new Mentionables(users, channels, roles);
-        }
-
-        public async Task<ChatLog> GetChatLogAsync(AuthToken token, Guild guild, Channel channel,
-            DateTimeOffset? after = null, DateTimeOffset? before = null, IProgress<double>? progress = null)
-        {
-            // Get messages
-            var messages = await GetMessagesAsync(token, channel.Id, after, before, progress);
-
-            // Get mentionables
-            var mentionables = await GetMentionablesAsync(token, guild.Id, messages);
-
-            return new ChatLog(guild, channel, after, before, messages, mentionables);
-        }
-
-        public async Task<ChatLog> GetChatLogAsync(AuthToken token, Channel channel,
-            DateTimeOffset? after = null, DateTimeOffset? before = null, IProgress<double>? progress = null)
-        {
-            // Get guild
-            var guild = !string.IsNullOrWhiteSpace(channel.GuildId)
-                ? await GetGuildAsync(token, channel.GuildId)
-                : Guild.DirectMessages;
-
-            // Get the chat log
-            return await GetChatLogAsync(token, guild, channel, after, before, progress);
-        }
-
         public void Dispose() => _httpClient.Dispose();
     }
 }

DiscordChatExporter.Core.Services/ExportService.cs

@@ -1,9 +1,10 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Threading.Tasks;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Rendering;
+using DiscordChatExporter.Core.Services.Logic;
 using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Core.Services
@@ -11,79 +12,99 @@ namespace DiscordChatExporter.Core.Services
     public class ExportService
     {
         private readonly SettingsService _settingsService;
+        private readonly DataService _dataService;
 
-        public ExportService(SettingsService settingsService)
+        public ExportService(SettingsService settingsService, DataService dataService)
         {
             _settingsService = settingsService;
+            _dataService = dataService;
         }
 
-        private IChatLogRenderer CreateRenderer(ChatLog chatLog, ExportFormat format)
+        private string GetFilePathFromOutputPath(string outputPath, ExportFormat format, RenderContext context)
         {
-            if (format == ExportFormat.PlainText)
+            // Output is a directory
-                return new PlainTextChatLogRenderer(chatLog, _settingsService.DateFormat);
+            if (Directory.Exists(outputPath) || string.IsNullOrWhiteSpace(Path.GetExtension(outputPath)))
-
+            {
-            if (format == ExportFormat.HtmlDark)
+                var fileName = ExportLogic.GetDefaultExportFileName(format, context.Guild, context.Channel, context.After, context.Before);
-                return new HtmlChatLogRenderer(chatLog, "Dark", _settingsService.DateFormat);
+                return Path.Combine(outputPath, fileName);
-
+            }
-            if (format == ExportFormat.HtmlLight)
-                return new HtmlChatLogRenderer(chatLog, "Light", _settingsService.DateFormat);
-
-            if (format == ExportFormat.Csv)
-                return new CsvChatLogRenderer(chatLog, _settingsService.DateFormat);
 
-            throw new ArgumentOutOfRangeException(nameof(format), $"Unknown format [{format}].");
+            // Output is a file
+            return outputPath;
         }
 
-        private async Task ExportChatLogAsync(ChatLog chatLog, string filePath, ExportFormat format)
+        private IMessageRenderer CreateRenderer(string outputPath, int partitionIndex, ExportFormat format, RenderContext context)
         {
+            var filePath = ExportLogic.GetExportPartitionFilePath(
+                GetFilePathFromOutputPath(outputPath, format, context),
+                partitionIndex);
+
             // Create output directory
             var dirPath = Path.GetDirectoryName(filePath);
             if (!string.IsNullOrWhiteSpace(dirPath))
                 Directory.CreateDirectory(dirPath);
 
-            // Render chat log to output file
+            // Create renderer
-            await using var writer = File.CreateText(filePath);
+
-            await CreateRenderer(chatLog, format).RenderAsync(writer);
+            if (format == ExportFormat.PlainText)
+                return new PlainTextMessageRenderer(filePath, context);
+
+            if (format == ExportFormat.Csv)
+                return new CsvMessageRenderer(filePath, context);
+
+            if (format == ExportFormat.HtmlDark)
+                return new HtmlMessageRenderer(filePath, context, "Dark");
+
+            if (format == ExportFormat.HtmlLight)
+                return new HtmlMessageRenderer(filePath, context, "Light");
+
+            throw new InvalidOperationException($"Unknown export format [{format}].");
         }
 
-        public async Task ExportChatLogAsync(ChatLog chatLog, string filePath, ExportFormat format, int? partitionLimit)
+        public async Task ExportChatLogAsync(AuthToken token, Guild guild, Channel channel,
+            string outputPath, ExportFormat format, int? partitionLimit,
+            DateTimeOffset? after = null, DateTimeOffset? before = null, IProgress<double>? progress = null)
         {
-            // If partitioning is disabled or there are fewer messages in chat log than the limit - process it without partitioning
+            // Create context
-            if (partitionLimit == null || partitionLimit <= 0 || chatLog.Messages.Count <= partitionLimit)
+            var mentionableUsers = new HashSet<User>(IdBasedEqualityComparer.Instance);
-            {
+            var mentionableChannels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
-                await ExportChatLogAsync(chatLog, filePath, format);
+            var mentionableRoles = await _dataService.GetGuildRolesAsync(token, guild.Id);
-            }
+
-            // Otherwise split into partitions and export separately
+            var context = new RenderContext
-            else
+            (
-            {
+                guild, channel, after, before, _settingsService.DateFormat,
-                // Create partitions by grouping up to X contiguous messages into separate chat logs
+                mentionableUsers, mentionableChannels, mentionableRoles
-                var partitions = chatLog.Messages.GroupContiguous(g => g.Count < partitionLimit.Value)
+            );
-                    .Select(g => new ChatLog(chatLog.Guild, chatLog.Channel, chatLog.After, chatLog.Before, g, chatLog.Mentionables))
-                    .ToArray();
-
-                // Split file path into components
-                var dirPath = Path.GetDirectoryName(filePath);
-                var fileNameWithoutExt = Path.GetFileNameWithoutExtension(filePath);
-                var fileExt = Path.GetExtension(filePath);
-
-                // Export each partition separately
-                var partitionNumber = 1;
-                foreach (var partition in partitions)
-                {
-                    // Compose new file name
-                    var partitionFilePath = $"{fileNameWithoutExt} [{partitionNumber} of {partitions.Length}]{fileExt}";
 
-                    // Compose full file path
+            // Render messages
-                    if (!string.IsNullOrWhiteSpace(dirPath))
+            var partitionIndex = 0;
-                        partitionFilePath = Path.Combine(dirPath, partitionFilePath);
+            var partitionMessageCount = 0;
+            var renderer = CreateRenderer(outputPath, partitionIndex, format, context);
 
-                    // Export
+            await foreach (var message in _dataService.GetMessagesAsync(token, channel.Id, after, before, progress))
-                    await ExportChatLogAsync(partition, partitionFilePath, format);
+            {
+                // Add encountered users to the list of mentionable users
+                mentionableUsers.Add(message.Author);
+                mentionableUsers.AddRange(message.MentionedUsers);
 
-                    // Increment partition number
+                // If new partition is required, reset renderer
-                    partitionNumber++;
+                if (partitionLimit != null && partitionLimit > 0 && partitionMessageCount >= partitionLimit)
+                {
+                    partitionIndex++;
+                    partitionMessageCount = 0;
+
+                    // Flush old renderer and create a new one
+                    await renderer.DisposeAsync();
+                    renderer = CreateRenderer(outputPath, partitionIndex, format, context);
                 }
+
+                // Render message
+                await renderer.RenderMessageAsync(message);
+                partitionMessageCount++;
             }
+
+            // Flush last renderer
+            await renderer.DisposeAsync();
         }
     }
 }

DiscordChatExporter.Core.Services/Extensions.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+
+namespace DiscordChatExporter.Core.Services
+{
+    public static class Extensions
+    {
+        private static async ValueTask<IReadOnlyList<T>> AggregateAsync<T>(this IAsyncEnumerable<T> asyncEnumerable)
+        {
+            var list = new List<T>();
+
+            await foreach (var i in asyncEnumerable)
+                list.Add(i);
+
+            return list;
+        }
+
+        public static ValueTaskAwaiter<IReadOnlyList<T>> GetAwaiter<T>(this IAsyncEnumerable<T> asyncEnumerable) =>
+            asyncEnumerable.AggregateAsync().GetAwaiter();
+    }
+}

DiscordChatExporter.Core.Services/Helpers/ExportHelper.cs

@@ -1,58 +0,0 @@
-using System;
-using System.IO;
-using System.Linq;
-using System.Text;
-using DiscordChatExporter.Core.Models;
-
-namespace DiscordChatExporter.Core.Services.Helpers
-{
-    public static class ExportHelper
-    {
-        public static bool IsDirectoryPath(string path) =>
-            path.Last() == Path.DirectorySeparatorChar ||
-            path.Last() == Path.AltDirectorySeparatorChar ||
-            string.IsNullOrWhiteSpace(Path.GetExtension(path)) && !File.Exists(path);
-
-        public static string GetDefaultExportFileName(ExportFormat format, Guild guild, Channel channel,
-            DateTimeOffset? after = null, DateTimeOffset? before = null)
-        {
-            var result = new StringBuilder();
-
-            // Append guild and channel names
-            result.Append($"{guild.Name} - {channel.Name} [{channel.Id}]");
-
-            // Append date range
-            if (after != null || before != null)
-            {
-                result.Append(" (");
-
-                // Both 'after' and 'before' are set
-                if (after != null && before != null)
-                {
-                    result.Append($"{after:yyyy-MM-dd} to {before:yyyy-MM-dd}");
-                }
-                // Only 'after' is set
-                else if (after != null)
-                {
-                    result.Append($"after {after:yyyy-MM-dd}");
-                }
-                // Only 'before' is set
-                else
-                {
-                    result.Append($"before {before:yyyy-MM-dd}");
-                }
-
-                result.Append(")");
-            }
-
-            // Append extension
-            result.Append($".{format.GetFileExtension()}");
-
-            // Replace invalid chars
-            foreach (var invalidChar in Path.GetInvalidFileNameChars())
-                result.Replace(invalidChar, '_');
-
-            return result.ToString();
-        }
-    }
-}

DiscordChatExporter.Core.Services/Internal/Extensions.cs

@@ -1,7 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.Drawing;
-using System.Threading.Tasks;
 
 namespace DiscordChatExporter.Core.Services.Internal
 {
@@ -16,15 +14,5 @@ namespace DiscordChatExporter.Core.Services.Internal
         }
 
         public static Color ResetAlpha(this Color color) => Color.FromArgb(1, color);
-
-        public static async Task<IReadOnlyList<T>> AggregateAsync<T>(this IAsyncEnumerable<T> asyncEnumerable)
-        {
-            var list = new List<T>();
-            
-            await foreach (var i in asyncEnumerable)
-                list.Add(i);
-
-            return list;
-        }
     }
 }

DiscordChatExporter.Core.Services/Logic/ExportLogic.cs

@@ -0,0 +1,72 @@
+using System;
+using System.IO;
+using System.Text;
+using DiscordChatExporter.Core.Models;
+
+namespace DiscordChatExporter.Core.Services.Logic
+{
+    public static class ExportLogic
+    {
+        public static string GetDefaultExportFileName(ExportFormat format,
+            Guild guild, Channel channel,
+            DateTimeOffset? after = null, DateTimeOffset? before = null)
+        {
+            var buffer = new StringBuilder();
+
+            // Append guild and channel names
+            buffer.Append($"{guild.Name} - {channel.Name} [{channel.Id}]");
+
+            // Append date range
+            if (after != null || before != null)
+            {
+                buffer.Append(" (");
+
+                // Both 'after' and 'before' are set
+                if (after != null && before != null)
+                {
+                    buffer.Append($"{after:yyyy-MM-dd} to {before:yyyy-MM-dd}");
+                }
+                // Only 'after' is set
+                else if (after != null)
+                {
+                    buffer.Append($"after {after:yyyy-MM-dd}");
+                }
+                // Only 'before' is set
+                else
+                {
+                    buffer.Append($"before {before:yyyy-MM-dd}");
+                }
+
+                buffer.Append(")");
+            }
+
+            // Append extension
+            buffer.Append($".{format.GetFileExtension()}");
+
+            // Replace invalid chars
+            foreach (var invalidChar in Path.GetInvalidFileNameChars())
+                buffer.Replace(invalidChar, '_');
+
+            return buffer.ToString();
+        }
+
+        public static string GetExportPartitionFilePath(string baseFilePath, int partitionIndex)
+        {
+            // First partition - no changes
+            if (partitionIndex <= 0)
+                return baseFilePath;
+
+            // Inject partition index into file name
+            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;
+        }
+    }
+}

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
-using DiscordChatExporter.Core.Services.Helpers;
+using DiscordChatExporter.Core.Services.Logic;
 using DiscordChatExporter.Gui.ViewModels.Components;
 using DiscordChatExporter.Gui.ViewModels.Framework;
 
@@ -62,7 +62,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
                 var channel = Channels.Single();
 
                 // Generate default file name
-                var defaultFileName = ExportHelper.GetDefaultExportFileName(SelectedFormat, Guild, channel, After, Before);
+                var defaultFileName = ExportLogic.GetDefaultExportFileName(SelectedFormat, Guild, channel, After, Before);
 
                 // Generate filter
                 var ext = SelectedFormat.GetFileExtension();

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -1,13 +1,11 @@
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Net;
 using System.Threading.Tasks;
 using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services;
 using DiscordChatExporter.Core.Services.Exceptions;
-using DiscordChatExporter.Core.Services.Helpers;
 using DiscordChatExporter.Gui.Services;
 using DiscordChatExporter.Gui.ViewModels.Components;
 using DiscordChatExporter.Gui.ViewModels.Framework;
@@ -163,10 +161,7 @@ namespace DiscordChatExporter.Gui.ViewModels
 
                 // Get direct messages
                 {
-                    // Get fake guild
                     var guild = Guild.DirectMessages;
-
-                    // Get channels
                     var channels = await _dataService.GetDirectMessageChannelsAsync(token);
 
                     // Create channel view models
@@ -197,13 +192,8 @@ namespace DiscordChatExporter.Gui.ViewModels
                 var guilds = await _dataService.GetUserGuildsAsync(token);
                 foreach (var guild in guilds)
                 {
-                    // Get channels
                     var channels = await _dataService.GetGuildChannelsAsync(token, guild.Id);
-
-                    // Get category channels
                     var categoryChannels = channels.Where(c => c.Type == ChannelType.GuildCategory).ToArray();
-
-                    // Get exportable channels
                     var exportableChannels = channels.Where(c => c.Type.IsExportable()).ToArray();
 
                     // Create channel view models
@@ -246,7 +236,6 @@ namespace DiscordChatExporter.Gui.ViewModels
             }
             finally
             {
-                // Dispose progress operation
                 operation.Dispose();
             }
         }
@@ -272,33 +261,15 @@ namespace DiscordChatExporter.Gui.ViewModels
             var successfulExportCount = 0;
             for (var i = 0; i < dialog.Channels.Count; i++)
             {
-                // Get operation and channel
                 var operation = operations[i];
                 var channel = dialog.Channels[i];
 
                 try
                 {
-                    // Generate file path if necessary
+                    await _exportService.ExportChatLogAsync(token, dialog.Guild, channel,
-                    var filePath = dialog.OutputPath!;
+                        dialog.OutputPath!, dialog.SelectedFormat, dialog.PartitionLimit,
-                    if (ExportHelper.IsDirectoryPath(filePath))
-                    {
-                        // Generate default file name
-                        var fileName = ExportHelper.GetDefaultExportFileName(dialog.SelectedFormat, dialog.Guild,
-                            channel, dialog.After, dialog.Before);
-
-                        // Combine paths
-                        filePath = Path.Combine(filePath, fileName);
-                    }
-
-                    // Get chat log
-                    var chatLog = await _dataService.GetChatLogAsync(token, dialog.Guild, channel,
                         dialog.After, dialog.Before, operation);
 
-                    // Export
-                    await _exportService.ExportChatLogAsync(chatLog, filePath, dialog.SelectedFormat,
-                        dialog.PartitionLimit);
-
-                    // Report successful export
                     successfulExportCount++;
                 }
                 catch (HttpErrorStatusCodeException ex) when (ex.StatusCode == HttpStatusCode.Forbidden)
@@ -311,7 +282,6 @@ namespace DiscordChatExporter.Gui.ViewModels
                 }
                 finally
                 {
-                    // Dispose progress operation
                     operation.Dispose();
                 }
             }