Refactor

DiscordChatExporter.Cli/Commands/GetGuildsCommand.cs

@@ -3,7 +3,7 @@ using System.Threading.Tasks;
 using CliFx;
 using CliFx.Attributes;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord;
+using DiscordChatExporter.Domain.Utilities;
 
 namespace DiscordChatExporter.Cli.Commands
 {

DiscordChatExporter.Domain/Discord/AccessibilityExtensions.cs

@@ -1,22 +0,0 @@
-using System.Collections.Generic;
-using System.Runtime.CompilerServices;
-using System.Threading.Tasks;
-
-namespace DiscordChatExporter.Domain.Discord
-{
-    public static class AccessibilityExtensions
-    {
-        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.Domain/Discord/AuthToken.cs

@@ -2,11 +2,7 @@
 
 namespace DiscordChatExporter.Domain.Discord
 {
-    public enum AuthTokenType
-    {
-        User,
-        Bot
-    }
+    public enum AuthTokenType { User, Bot }
 
     public class AuthToken
     {

DiscordChatExporter.Domain/Discord/DiscordClient.cs

@@ -23,7 +23,9 @@ namespace DiscordChatExporter.Domain.Discord
             _token = token;
             _httpClient = httpClient;
 
-            // Discord seems to always respond 429 on our first request with unreasonable wait time (10+ minutes).
+            _httpClient.BaseAddress = new Uri("https://discordapp.com/api/v6");
+
+            // Discord seems to always respond with 429 on the first request with unreasonable wait time (10+ minutes).
             // For that reason the policy will start respecting their retry-after header only after Nth failed response.
             _httpRequestPolicy = Policy
                 .HandleResult<HttpResponseMessage>(m => m.StatusCode == HttpStatusCode.TooManyRequests)
@@ -240,10 +242,7 @@ namespace DiscordChatExporter.Domain.Discord
 
             handler.UseCookies = false;
 
-            return new HttpClient(handler, true)
-            {
-                BaseAddress = new Uri("https://discordapp.com/api/v6")
-            };
+            return new HttpClient(handler, true);
         });
     }
 }

DiscordChatExporter.Domain/Exporting/Exporter.cs

@@ -31,8 +31,7 @@ namespace DiscordChatExporter.Domain.Exporting
             var mentionableChannels = await _discord.GetGuildChannelsAsync(guild.Id);
             var mentionableRoles = guild.Roles;
 
-            var context = new RenderContext
-            (
+            var context = new RenderContext(
                 guild, channel, after, before, dateFormat,
                 mentionableUsers, mentionableChannels, mentionableRoles
             );

DiscordChatExporter.Domain/Exporting/Writers/CsvMessageWriter.cs

@@ -9,7 +9,7 @@ using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Domain.Exporting.Writers
 {
-    internal class CsvMessageWriter : MessageWriterBase
+    internal partial class CsvMessageWriter : MessageWriterBase
     {
         private readonly TextWriter _writer;
 
@@ -19,35 +19,26 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer = new StreamWriter(stream);
         }
 
-        private string EncodeValue(string value)
-        {
-            value = value.Replace("\"", "\"\"");
-            return $"\"{value}\"";
-        }
-
-        private string FormatMarkdown(string markdown) =>
-            PlainTextMarkdownVisitor.Format(Context, markdown);
-
-        private string FormatMessage(Message message)
-        {
-            var buffer = new StringBuilder();
-
-            buffer
-                .Append(EncodeValue(message.Author.Id)).Append(',')
-                .Append(EncodeValue(message.Author.FullName)).Append(',')
-                .Append(EncodeValue(message.Timestamp.ToLocalString(Context.DateFormat))).Append(',')
-                .Append(EncodeValue(FormatMarkdown(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();
-        }
+        private string FormatMarkdown(string? markdown) =>
+            PlainTextMarkdownVisitor.Format(Context, markdown ?? "");
 
         public override async Task WritePreambleAsync() =>
             await _writer.WriteLineAsync("AuthorID,Author,Date,Content,Attachments,Reactions");
 
-        public override async Task WriteMessageAsync(Message message) =>
-            await _writer.WriteLineAsync(FormatMessage(message));
+        public override async Task WriteMessageAsync(Message message)
+        {
+            var buffer = new StringBuilder();
+
+            buffer
+                .Append(CsvEncode(message.Author.Id)).Append(',')
+                .Append(CsvEncode(message.Author.FullName)).Append(',')
+                .Append(CsvEncode(message.Timestamp.ToLocalString(Context.DateFormat))).Append(',')
+                .Append(CsvEncode(FormatMarkdown(message.Content))).Append(',')
+                .Append(CsvEncode(message.Attachments.Select(a => a.Url).JoinToString(","))).Append(',')
+                .Append(CsvEncode(message.Reactions.Select(r => $"{r.Emoji.Name} ({r.Count})").JoinToString(",")));
+
+            await _writer.WriteLineAsync(buffer.ToString());
+        }
 
         public override async ValueTask DisposeAsync()
         {
@@ -55,4 +46,13 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             await base.DisposeAsync();
         }
     }
+
+    internal partial class CsvMessageWriter
+    {
+        private static string CsvEncode(string value)
+        {
+            value = value.Replace("\"", "\"\"");
+            return $"\"{value}\"";
+        }
+    }
 }

DiscordChatExporter.Domain/Exporting/Writers/HtmlMessageWriter.cs

@@ -1,17 +1,12 @@
 using System;
 using System.Collections.Generic;
-using System.Drawing;
 using System.IO;
 using System.Linq;
-using System.Net;
 using System.Reflection;
-using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using DiscordChatExporter.Domain.Discord.Models;
 using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
 using DiscordChatExporter.Domain.Internal;
-using DiscordChatExporter.Domain.Markdown;
-using DiscordChatExporter.Domain.Markdown.Ast;
 using Scriban;
 using Scriban.Runtime;
 using Tyrrrz.Extensions;
@@ -79,7 +74,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
                 new Func<DateTimeOffset, string>(d => d.ToLocalString(Context.DateFormat)));
 
             scriptObject.Import("FormatMarkdown",
-                new Func<string, string>(FormatMarkdown));
+                new Func<string?, string>(FormatMarkdown));
 
             scriptObject.Import("GetUserColor", new Func<Guild, User, string>(Guild.GetUserColor));
 
@@ -94,8 +89,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             return templateContext;
         }
 
-        private string FormatMarkdown(string markdown) =>
-            HtmlMarkdownVisitor.Format(Context, markdown);
+        private string FormatMarkdown(string? markdown) =>
+            HtmlMarkdownVisitor.Format(Context, markdown ?? "");
 
         private async Task RenderCurrentMessageGroupAsync()
         {
@@ -180,7 +175,5 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             ResourcesAssembly
                 .GetManifestResourceString($"{ResourcesNamespace}.HtmlLayoutTemplate.html")
                 .SubstringAfter("{{~ %SPLIT% ~}}");
-
-        private static string HtmlEncode(string s) => WebUtility.HtmlEncode(s);
     }
 }

DiscordChatExporter.Domain/Exporting/Writers/JsonMessageWriter.cs

@@ -22,6 +22,124 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             });
         }
 
+        private string FormatMarkdown(string? markdown) =>
+            PlainTextMarkdownVisitor.Format(Context, markdown ?? "");
+
+        private void WriteAttachment(Attachment attachment)
+        {
+            _writer.WriteStartObject();
+
+            _writer.WriteString("id", attachment.Id);
+            _writer.WriteString("url", attachment.Url);
+            _writer.WriteString("fileName", attachment.FileName);
+            _writer.WriteNumber("fileSizeBytes", attachment.FileSize.TotalBytes);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbedAuthor(EmbedAuthor embedAuthor)
+        {
+            _writer.WriteStartObject("author");
+
+            _writer.WriteString("name", embedAuthor.Name);
+            _writer.WriteString("url", embedAuthor.Url);
+            _writer.WriteString("iconUrl", embedAuthor.IconUrl);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbedThumbnail(EmbedImage embedThumbnail)
+        {
+            _writer.WriteStartObject("thumbnail");
+
+            _writer.WriteString("url", embedThumbnail.Url);
+            _writer.WriteNumber("width", embedThumbnail.Width);
+            _writer.WriteNumber("height", embedThumbnail.Height);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbedImage(EmbedImage embedImage)
+        {
+            _writer.WriteStartObject("image");
+
+            _writer.WriteString("url", embedImage.Url);
+            _writer.WriteNumber("width", embedImage.Width);
+            _writer.WriteNumber("height", embedImage.Height);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbedFooter(EmbedFooter embedFooter)
+        {
+            _writer.WriteStartObject("footer");
+
+            _writer.WriteString("text", embedFooter.Text);
+            _writer.WriteString("iconUrl", embedFooter.IconUrl);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbedField(EmbedField embedField)
+        {
+            _writer.WriteStartObject();
+
+            _writer.WriteString("name", embedField.Name);
+            _writer.WriteString("value", embedField.Value);
+            _writer.WriteBoolean("isInline", embedField.IsInline);
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteEmbed(Embed embed)
+        {
+            _writer.WriteStartObject();
+
+            _writer.WriteString("title", FormatMarkdown(embed.Title));
+            _writer.WriteString("url", embed.Url);
+            _writer.WriteString("timestamp", embed.Timestamp);
+            _writer.WriteString("description", FormatMarkdown(embed.Description));
+
+            if (embed.Author != null)
+                WriteEmbedAuthor(embed.Author);
+
+            if (embed.Thumbnail != null)
+                WriteEmbedThumbnail(embed.Thumbnail);
+
+            if (embed.Image != null)
+                WriteEmbedImage(embed.Image);
+
+            if (embed.Footer != null)
+                WriteEmbedFooter(embed.Footer);
+
+            // Fields
+            _writer.WriteStartArray("fields");
+
+            foreach (var field in embed.Fields)
+                WriteEmbedField(field);
+
+            _writer.WriteEndArray();
+
+            _writer.WriteEndObject();
+        }
+
+        private void WriteReaction(Reaction reaction)
+        {
+            _writer.WriteStartObject();
+
+            // Emoji
+            _writer.WriteStartObject("emoji");
+            _writer.WriteString("id", reaction.Emoji.Id);
+            _writer.WriteString("name", reaction.Emoji.Name);
+            _writer.WriteBoolean("isAnimated", reaction.Emoji.IsAnimated);
+            _writer.WriteString("imageUrl", reaction.Emoji.ImageUrl);
+            _writer.WriteEndObject();
+
+            _writer.WriteNumber("count", reaction.Count);
+
+            _writer.WriteEndObject();
+        }
+
         public override async Task WritePreambleAsync()
         {
             // Root object (start)
@@ -66,8 +184,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteBoolean("isPinned", message.IsPinned);
 
             // Content
-            var content = PlainTextMarkdownVisitor.Format(Context, message.Content);
-            _writer.WriteString("content", content);
+            _writer.WriteString("content", FormatMarkdown(message.Content));
 
             // Author
             _writer.WriteStartObject("author");
@@ -82,16 +199,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteStartArray("attachments");
 
             foreach (var attachment in message.Attachments)
-            {
-                _writer.WriteStartObject();
-
-                _writer.WriteString("id", attachment.Id);
-                _writer.WriteString("url", attachment.Url);
-                _writer.WriteString("fileName", attachment.FileName);
-                _writer.WriteNumber("fileSizeBytes", attachment.FileSize.TotalBytes);
-
-                _writer.WriteEndObject();
-            }
+                WriteAttachment(attachment);
 
             _writer.WriteEndArray();
 
@@ -99,71 +207,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteStartArray("embeds");
 
             foreach (var embed in message.Embeds)
-            {
-                _writer.WriteStartObject();
-
-                _writer.WriteString("title", embed.Title);
-                _writer.WriteString("url", embed.Url);
-                _writer.WriteString("timestamp", embed.Timestamp);
-                _writer.WriteString("description", embed.Description);
-
-                // Author
-                if (embed.Author != null)
-                {
-                    _writer.WriteStartObject("author");
-                    _writer.WriteString("name", embed.Author.Name);
-                    _writer.WriteString("url", embed.Author.Url);
-                    _writer.WriteString("iconUrl", embed.Author.IconUrl);
-                    _writer.WriteEndObject();
-                }
-
-                // Thumbnail
-                if (embed.Thumbnail != null)
-                {
-                    _writer.WriteStartObject("thumbnail");
-                    _writer.WriteString("url", embed.Thumbnail.Url);
-                    _writer.WriteNumber("width", embed.Thumbnail.Width);
-                    _writer.WriteNumber("height", embed.Thumbnail.Height);
-                    _writer.WriteEndObject();
-                }
-
-                // Image
-                if (embed.Image != null)
-                {
-                    _writer.WriteStartObject("image");
-                    _writer.WriteString("url", embed.Image.Url);
-                    _writer.WriteNumber("width", embed.Image.Width);
-                    _writer.WriteNumber("height", embed.Image.Height);
-                    _writer.WriteEndObject();
-                }
-
-                // Footer
-                if (embed.Footer != null)
-                {
-                    _writer.WriteStartObject("footer");
-                    _writer.WriteString("text", embed.Footer.Text);
-                    _writer.WriteString("iconUrl", embed.Footer.IconUrl);
-                    _writer.WriteEndObject();
-                }
-
-                // Fields
-                _writer.WriteStartArray("fields");
-
-                foreach (var field in embed.Fields)
-                {
-                    _writer.WriteStartObject();
-
-                    _writer.WriteString("name", field.Name);
-                    _writer.WriteString("value", field.Value);
-                    _writer.WriteBoolean("isInline", field.IsInline);
-
-                    _writer.WriteEndObject();
-                }
-
-                _writer.WriteEndArray();
-
-                _writer.WriteEndObject();
-            }
+                WriteEmbed(embed);
 
             _writer.WriteEndArray();
 
@@ -171,31 +215,14 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteStartArray("reactions");
 
             foreach (var reaction in message.Reactions)
-            {
-                _writer.WriteStartObject();
-
-                // Emoji
-                _writer.WriteStartObject("emoji");
-                _writer.WriteString("id", reaction.Emoji.Id);
-                _writer.WriteString("name", reaction.Emoji.Name);
-                _writer.WriteBoolean("isAnimated", reaction.Emoji.IsAnimated);
-                _writer.WriteString("imageUrl", reaction.Emoji.ImageUrl);
-                _writer.WriteEndObject();
-
-                // Count
-                _writer.WriteNumber("count", reaction.Count);
-
-                _writer.WriteEndObject();
-            }
+                WriteReaction(reaction);
 
             _writer.WriteEndArray();
 
             _writer.WriteEndObject();
 
-            _messageCount++;
-
             // Flush every 100 messages
-            if (_messageCount % 100 == 0)
+            if (_messageCount++ % 100 == 0)
                 await _writer.FlushAsync();
         }
 
@@ -204,7 +231,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             // Message array (end)
             _writer.WriteEndArray();
 
-            // Message count
             _writer.WriteNumber("messageCount", _messageCount);
 
             // Root object (end)

DiscordChatExporter.Domain/Exporting/Writers/MarkdownVisitors/HtmlMarkdownVisitor.cs

@@ -115,7 +115,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
                     : "";
 
                 _buffer
-                    .Append($"<span class=\"mention\" style=\"{style}>\"")
+                    .Append($"<span class=\"mention\" style=\"{style}\">")
                     .Append("@").Append(HtmlEncode(role.Name))
                     .Append("</span>");
             }

DiscordChatExporter.Domain/Exporting/Writers/MarkdownVisitors/PlainTextMarkdownVisitor.cs

@@ -52,9 +52,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
 
         public override MarkdownNode VisitEmoji(EmojiNode emoji)
         {
-            _buffer.Append(emoji.IsCustomEmoji
-                ? $":{emoji.Name}:"
-                : emoji.Name);
+            _buffer.Append(
+                emoji.IsCustomEmoji
+                    ? $":{emoji.Name}:"
+                    : emoji.Name
+            );
 
             return base.VisitEmoji(emoji);
         }

DiscordChatExporter.Domain/Exporting/Writers/PlainTextMessageWriter.cs

@@ -22,41 +22,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer = new StreamWriter(stream);
         }
 
-        private string FormatPreamble()
-        {
-            var buffer = new StringBuilder();
-
-            buffer.Append('=', 62).AppendLine();
-            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: {Context.After.Value.ToLocalString(Context.DateFormat)}");
-
-            if (Context.Before != null)
-                buffer.AppendLine($"Before: {Context.Before.Value.ToLocalString(Context.DateFormat)}");
-
-            buffer.Append('=', 62).AppendLine();
-
-            return buffer.ToString();
-        }
-
-        private string FormatPostamble()
-        {
-            var buffer = new StringBuilder();
-
-            buffer.Append('=', 62).AppendLine();
-            buffer.AppendLine($"Exported {_messageCount:N0} message(s)");
-            buffer.Append('=', 62).AppendLine();
-
-            return buffer.ToString();
-        }
-
-        private string FormatMarkdown(string markdown) =>
-            PlainTextMarkdownVisitor.Format(Context, markdown);
+        private string FormatMarkdown(string? markdown) =>
+            PlainTextMarkdownVisitor.Format(Context, markdown ?? "");
 
         private string FormatMessageHeader(Message message)
         {
@@ -70,21 +37,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             // Whether the message is pinned
             if (message.IsPinned)
-            {
                 buffer.Append(' ').Append("(pinned)");
-            }
 
             return buffer.ToString();
         }
 
-        private string FormatMessageContent(Message message)
-        {
-            if (string.IsNullOrWhiteSpace(message.Content))
-                return "";
-
-            return FormatMarkdown(message.Content);
-        }
-
         private string FormatAttachments(IReadOnlyList<Attachment> attachments)
         {
             if (!attachments.Any())
@@ -109,49 +66,25 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             foreach (var embed in embeds)
             {
-                buffer.AppendLine("{Embed}");
+                buffer
+                    .AppendLine("{Embed}")
+                    .AppendLineIfNotNullOrWhiteSpace(embed.Author?.Name)
+                    .AppendLineIfNotNullOrWhiteSpace(embed.Url)
+                    .AppendLineIfNotNullOrWhiteSpace(FormatMarkdown(embed.Title))
+                    .AppendLineIfNotNullOrWhiteSpace(FormatMarkdown(embed.Description));
 
-                // 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(embed.Title));
-
-                // Description
-                if (!string.IsNullOrWhiteSpace(embed.Description))
-                    buffer.AppendLine(FormatMarkdown(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);
+                    buffer
+                        .AppendLineIfNotNullOrWhiteSpace(field.Name)
+                        .AppendLineIfNotNullOrWhiteSpace(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();
+                buffer
+                    .AppendLineIfNotNullOrWhiteSpace(embed.Thumbnail?.Url)
+                    .AppendLineIfNotNullOrWhiteSpace(embed.Image?.Url)
+                    .AppendLineIfNotNullOrWhiteSpace(embed.Footer?.Text)
+                    .AppendLine();
             }
 
             return buffer.ToString();
@@ -187,18 +120,35 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             buffer
                 .AppendLine(FormatMessageHeader(message))
-                .AppendLineIfNotEmpty(FormatMessageContent(message))
+                .AppendLineIfNotNullOrWhiteSpace(FormatMarkdown(message.Content))
                 .AppendLine()
-                .AppendLineIfNotEmpty(FormatAttachments(message.Attachments))
-                .AppendLineIfNotEmpty(FormatEmbeds(message.Embeds))
-                .AppendLineIfNotEmpty(FormatReactions(message.Reactions));
+                .AppendLineIfNotNullOrWhiteSpace(FormatAttachments(message.Attachments))
+                .AppendLineIfNotNullOrWhiteSpace(FormatEmbeds(message.Embeds))
+                .AppendLineIfNotNullOrWhiteSpace(FormatReactions(message.Reactions));
 
             return buffer.Trim().ToString();
         }
 
         public override async Task WritePreambleAsync()
         {
-            await _writer.WriteLineAsync(FormatPreamble());
+            var buffer = new StringBuilder();
+
+            buffer.Append('=', 62).AppendLine();
+            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: {Context.After.Value.ToLocalString(Context.DateFormat)}");
+
+            if (Context.Before != null)
+                buffer.AppendLine($"Before: {Context.Before.Value.ToLocalString(Context.DateFormat)}");
+
+            buffer.Append('=', 62).AppendLine();
+
+            await _writer.WriteLineAsync(buffer.ToString());
         }
 
         public override async Task WriteMessageAsync(Message message)
@@ -211,8 +161,15 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async Task WritePostambleAsync()
         {
-            await _writer.WriteLineAsync();
-            await _writer.WriteLineAsync(FormatPostamble());
+            var buffer = new StringBuilder();
+
+            buffer
+                .Append('=', 62).AppendLine()
+                .AppendLine($"Exported {_messageCount:N0} message(s)")
+                .Append('=', 62).AppendLine()
+                .AppendLine();
+
+            await _writer.WriteLineAsync(buffer.ToString());
         }
 
         public override async ValueTask DisposeAsync()

DiscordChatExporter.Domain/Internal/StringExtensions.cs

@@ -4,7 +4,7 @@ namespace DiscordChatExporter.Domain.Internal
 {
     internal static class StringExtensions
     {
-        public static StringBuilder AppendLineIfNotEmpty(this StringBuilder builder, string value) =>
+        public static StringBuilder AppendLineIfNotNullOrWhiteSpace(this StringBuilder builder, string? value) =>
             !string.IsNullOrWhiteSpace(value) ? builder.AppendLine(value) : builder;
 
         public static StringBuilder Trim(this StringBuilder builder)

DiscordChatExporter.Domain/Utilities/AsyncExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -8,6 +9,19 @@ namespace DiscordChatExporter.Domain.Utilities
 {
     public static class AsyncExtensions
     {
+        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();
+
         public static async Task ParallelForEachAsync<T>(this IEnumerable<T> source, Func<T, Task> handleAsync, int degreeOfParallelism)
         {
             using var semaphore = new SemaphoreSlim(degreeOfParallelism);