Update version

Fixes #551

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,42 @@
+name: "\U0001F41E Bug report"
+description: Report broken functionality.
+labels: [bug]
+body:
+- type: markdown
+  attributes:
+    value: |
+      - Please check existing issues (both opened and closed) to ensure that this bug hasn't been reported before.
+      - Refer to the [contribution guidelines](https://github.com/Tyrrrz/DiscordChatExporter/blob/master/Contributing.md) for info on how to file a good issue.
+      - If you want to ask a question instead of reporting a bug, use [**discussions**](https://github.com/Tyrrrz/DiscordChatExporter/discussions/new) instead.
+
+- type: input
+  attributes:
+    label: Version
+    description: "Which version(s) of DiscordChatExporter does this bug affect?"
+  validations:
+    required: true
+
+- type: dropdown
+  attributes:
+    label: Flavor
+    description: "Which flavor(s) of DiscordChatExporter does this bug affect?"
+    multiple: true
+    options:
+    - GUI (Graphical User Interface)
+    - CLI (Command Line Interface)
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Details
+    description: "Clear and thorough explanation of the bug. If relevant, include screenshots or screen recordings."
+  validations:
+    required: true
+
+- type: textarea
+  attributes:
+    label: Steps to reproduce
+    description: "Minimum steps required to reproduce the bug."
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: "\U0001F4D6 Read the wiki"
+    url: https://github.com/Tyrrrz/DiscordChatExporter/wiki
+    about: Find answers to most common questions.
+  - name: "\U0001F5E8 Ask a question"
+    url: https://github.com/Tyrrrz/DiscordChatExporter/discussions/new
+    about: Please ask and answer questions here.

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -0,0 +1,26 @@
+name: "\U00002728 Feature request"
+description: Request a new feature.
+labels: [enhancement]
+body:
+- type: markdown
+  attributes:
+    value: |
+      - Please check existing issues (both opened and closed) to ensure that this feature hasn't been requested before.
+      - Refer to the [contribution guidelines](https://github.com/Tyrrrz/DiscordChatExporter/blob/master/Contributing.md) for info on how to file a good issue.
+      - If you want to ask a question instead of requesting a feature, use [**discussions**](https://github.com/Tyrrrz/DiscordChatExporter/discussions/new) instead.
+
+- type: dropdown
+  attributes:
+    label: Flavor
+    description: "Which flavor(s) of DiscordChatExporter does this feature request apply to?"
+    multiple: true
+    options:
+    - GUI (Graphical User Interface)
+    - CLI (Command Line Interface)
+
+- type: textarea
+  attributes:
+    label: Details
+    description: "Clear and thorough explanation of the feature you have in mind."
+  validations:
+    required: true

.gitignore

@@ -4,6 +4,7 @@
 *.userosscache
 *.sln.docstates
 .idea/
+.vs/
 
 # Build results
 [Dd]ebug/

Changelog.md

@@ -1,3 +1,19 @@
+### v2.27 (24-Apr-2021)
+
+- Added partitioning by file size. You can now use values such as `10mb` to indicate a size-based cut off point, in addition to values like `10` to indicate a number of messages. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- [CLI] Improved formatting and progress reporting.
+- [CLI] Changed `export` command so that it can accept multiple channel IDs passed to `-c|--channel` option. This makes it possible to export multiple channels at once while benefiting from parallelization.
+- [JSON] Added `color` field to message author. This is a hex string that represents user's color, inherited from their roles. (Thanks [@rtm516](https://github.com/rtm516))
+- [JSON] Added `categoryId` field to the root. This represents the ID of the category channel that the currently exported channel belongs to. (Thanks [@rtm516](https://github.com/rtm516))
+- [JSON] Fixed an issue where user discriminator was written without leading zeroes. (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+- [JSON] Fixed an issue where the application sometimes crashed with an error saying `']' invalid without a matching open`, which was just a validation message that masked the actual error behind the failure. (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+- Fixed an issue where progress was not reported correctly if the channel didn't have any messages in the specified time range.
+
+### v2.26.1 (06-Feb-2021)
+
+- [CLI] Added support for file name templates, which allow you to dynamically generate output file names based on channel and guild metadata. (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+- Fixed an issue where the application sometimes crashed with `Invalid snowflake` message when exporting chat logs that contained invalid or outdated mentions. (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+
 ### v2.26 (29-Dec-2020)
 
 - [HTML] Added support for replies. (Thanks [@Sanqui](https://github.com/Sanqui))

Contributing.md

@@ -0,0 +1,56 @@
+# Contributing
+
+DiscordChatExporter accepts contributions in the form of issues and pull requests.
+
+## Creating issues
+
+If you have a feature suggestion or want to report a bug, you are welcome to create an issue.
+
+Guidelines:
+
+- Avoid creating an issue if a similar one already exists. Look through existing open and closed issues first.
+- Keep your issue focused on one specific problem. If you have multiple suggestions or bug reports, please create separate issues for them.
+- Provide a descriptive title for your issue. Don't use generic titles like "A couple suggestions" or "Not working".
+- Provide more context in the body of the issue. If relevant, attach screenshots or screen recordings.
+- Remain civil and respectful when participating in discussions.
+
+## Creating pull requests
+
+If you want to contribute code to the project, you can do so by creating a pull request.
+
+Guidelines:
+
+- Make sure that there is an existing issue that describes the problem solved by your pull request. If there isn't one, please create it first.
+- Add a comment to the issue indicating that you want to submit a pull request for it. This can be a good opportunity to discuss possible solutions, finalize requirements, or ask questions.
+- Keep your pull request focused and as small as possible. If you want to contribute multiple unrelated changes, please create separate pull requests for them.
+- Follow the coding style and conventions already established by the project. When in doubt which style to use, ask in comments to your pull request.
+- If you want to start a discussion regarding a specific change you made, add a review comment to your own code. This can be used to highlight something important or to seek input from others.
+
+## Building the project locally
+
+Prerequisites:
+
+- [.NET 5.0 SDK](https://dotnet.microsoft.com/download/dotnet/5.0)
+- [.NET 3.1 SDK](https://dotnet.microsoft.com/download/dotnet/3.1) (temporarily as the app still targets .NET 3.1, but requires .NET 5.0 to build)
+- _(Optional)_ C#/.NET IDE, such as [JetBrains Rider](https://www.jetbrains.com/rider), [VS Code](https://code.visualstudio.com/docs/languages/csharp), or [Visual Studio](https://visualstudio.microsoft.com).
+
+To build the entire solution run the following command in the root of the repository:
+
+```sh
+> dotnet build
+```
+
+This will generate runtime artifacts for each project:
+
+```plaintext
+./DiscordChatExporter.Gui/bin/[Debug|Release]/[runtime]/*
+./DiscordChatExporter.Cli/bin/[Debug|Release]/[runtime]/*
+```
+
+You can also build and run a specific project directly.
+To do that, navigate to its directory and use `dotnet run`:
+
+```sh
+> cd DiscordChatExporter.Gui
+> dotnet run
+```

Directory.Build.props

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>2.26</Version>
+    <Version>2.27</Version>
     <Company>Tyrrrz</Company>
     <Copyright>Copyright (c) Alexey Golub</Copyright>
     <LangVersion>preview</LangVersion>

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -1,12 +1,20 @@
-using System.IO;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
 using CliFx.Exceptions;
-using CliFx.Utilities;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Utils.Extensions;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exceptions;
+using DiscordChatExporter.Core.Exporting;
+using DiscordChatExporter.Core.Exporting.Partitioning;
+using DiscordChatExporter.Core.Utils.Extensions;
+using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands.Base
 {
@@ -24,8 +32,11 @@ namespace DiscordChatExporter.Cli.Commands.Base
         [CommandOption("before", Description = "Only include messages sent before this date or message ID.")]
         public Snowflake? Before { get; init; }
 
-        [CommandOption("partition", 'p', Description = "Split output into partitions limited to this number of messages.")]
-        public int? PartitionLimit { get; init; }
+        [CommandOption("partition", 'p', Description = "Split output into partitions, each limited to this number of messages (e.g. 100) or file size (e.g. 10mb).")]
+        public PartitionLimit PartitionLimit { get; init; } = NullPartitionLimit.Instance;
+
+        [CommandOption("parallel", Description = "Limits how many channels can be exported in parallel.")]
+        public int ParallelLimit { get; init; } = 1;
 
         [CommandOption("media", Description = "Download referenced media content.")]
         public bool ShouldDownloadMedia { get; init; }
@@ -36,49 +47,96 @@ namespace DiscordChatExporter.Cli.Commands.Base
         [CommandOption("dateformat", Description = "Format used when writing dates.")]
         public string DateFormat { get; init; } = "dd-MMM-yy hh:mm tt";
 
-        protected ChannelExporter GetChannelExporter() => new(GetDiscordClient());
+        private ChannelExporter? _channelExporter;
+        protected ChannelExporter Exporter => _channelExporter ??= new ChannelExporter(Discord);
 
-        protected async ValueTask ExportAsync(IConsole console, Guild guild, Channel channel)
+        protected async ValueTask ExportAsync(IConsole console, IReadOnlyList<Channel> channels)
         {
-            console.Output.Write($"Exporting channel '{channel.Category} / {channel.Name}'... ");
-            var progress = console.CreateProgressTicker();
+            await console.Output.WriteLineAsync($"Exporting {channels.Count} channel(s)...");
 
-            var request = new ExportRequest(
-                guild,
-                channel,
-                OutputPath,
-                ExportFormat,
-                After,
-                Before,
-                PartitionLimit,
-                ShouldDownloadMedia,
-                ShouldReuseMedia,
-                DateFormat
-            );
+            var errors = new ConcurrentDictionary<Channel, string>();
 
-            await GetChannelExporter().ExportChannelAsync(request, progress);
+            // Wrap everything in a progress ticker
+            await console.CreateProgressTicker().StartAsync(async progressContext =>
+            {
+                await channels.ParallelForEachAsync(async channel =>
+                {
+                    // Export
+                    try
+                    {
+                        await progressContext.StartTaskAsync($"{channel.Category} / {channel.Name}", async progress =>
+                        {
+                            var guild = await Discord.GetGuildAsync(channel.GuildId);
 
-            console.Output.WriteLine();
-            console.Output.WriteLine("Done.");
-        }
+                            var request = new ExportRequest(
+                                guild,
+                                channel,
+                                OutputPath,
+                                ExportFormat,
+                                After,
+                                Before,
+                                PartitionLimit,
+                                ShouldDownloadMedia,
+                                ShouldReuseMedia,
+                                DateFormat
+                            );
 
-        protected async ValueTask ExportAsync(IConsole console, Channel channel)
-        {
-            var guild = await GetDiscordClient().GetGuildAsync(channel.GuildId);
-            await ExportAsync(console, guild, channel);
-        }
+                            await Exporter.ExportChannelAsync(request, progress);
+                        });
+                    }
+                    catch (DiscordChatExporterException ex) when (!ex.IsCritical)
+                    {
+                        errors[channel] = ex.Message;
+                    }
+                }, ParallelLimit.ClampMin(1));
+            });
 
-        protected async ValueTask ExportAsync(IConsole console, Snowflake channelId)
-        {
-            var channel = await GetDiscordClient().GetChannelAsync(channelId);
-            await ExportAsync(console, channel);
+            // Print result
+            using (console.WithForegroundColor(ConsoleColor.White))
+            {
+                await console.Output.WriteLineAsync(
+                    $"Successfully exported {channels.Count - errors.Count} channel(s)."
+                );
+            }
+
+            // Print errors
+            if (errors.Any())
+            {
+                await console.Output.WriteLineAsync();
+
+                using (console.WithForegroundColor(ConsoleColor.Red))
+                {
+                    await console.Output.WriteLineAsync(
+                        $"Failed to export {errors.Count} channel(s):"
+                    );
+                }
+
+                foreach (var (channel, error) in errors)
+                {
+                    await console.Output.WriteAsync($"{channel.Category} / {channel.Name}: ");
+
+                    using (console.WithForegroundColor(ConsoleColor.Red))
+                        await console.Output.WriteLineAsync(error);
+                }
+
+                await console.Output.WriteLineAsync();
+            }
+
+            // Fail the command if ALL channels failed to export.
+            // Having some of the channels fail to export is fine and expected.
+            if (errors.Count >= channels.Count)
+            {
+                throw new CommandException("Export failed.");
+            }
+
+            await console.Output.WriteLineAsync("Done.");
         }
 
         public override ValueTask ExecuteAsync(IConsole console)
         {
             if (ShouldReuseMedia && !ShouldDownloadMedia)
             {
-                throw new CommandException("The --reuse-media option cannot be used without the --media option.");
+                throw new CommandException("Option --reuse-media cannot be used without --media.");
             }
 
             return default;

DiscordChatExporter.Cli/Commands/Base/ExportMultipleCommandBase.cs

@@ -1,79 +0,0 @@
-using System.Collections.Concurrent;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using CliFx;
-using CliFx.Attributes;
-using CliFx.Utilities;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exceptions;
-using DiscordChatExporter.Domain.Exporting;
-using DiscordChatExporter.Domain.Utilities;
-using Gress;
-using Tyrrrz.Extensions;
-
-namespace DiscordChatExporter.Cli.Commands.Base
-{
-    public abstract class ExportMultipleCommandBase : ExportCommandBase
-    {
-        [CommandOption("parallel", Description = "Limits how many channels can be exported in parallel.")]
-        public int ParallelLimit { get; init; } = 1;
-
-        protected async ValueTask ExportMultipleAsync(IConsole console, IReadOnlyList<Channel> channels)
-        {
-            // This uses a different route from ExportCommandBase.ExportAsync() because it runs
-            // in parallel and needs another way to report progress to console.
-
-            console.Output.Write($"Exporting {channels.Count} channels... ");
-            var progress = console.CreateProgressTicker();
-
-            var operations = progress.Wrap().CreateOperations(channels.Count);
-
-            var successfulExportCount = 0;
-            var errors = new ConcurrentBag<(Channel, string)>();
-
-            await channels.Zip(operations).ParallelForEachAsync(async tuple =>
-            {
-                var (channel, operation) = tuple;
-
-                try
-                {
-                    var guild = await GetDiscordClient().GetGuildAsync(channel.GuildId);
-
-                    var request = new ExportRequest(
-                        guild,
-                        channel,
-                        OutputPath,
-                        ExportFormat,
-                        After,
-                        Before,
-                        PartitionLimit,
-                        ShouldDownloadMedia,
-                        ShouldReuseMedia,
-                        DateFormat
-                    );
-
-                    await GetChannelExporter().ExportChannelAsync(request, operation);
-
-                    Interlocked.Increment(ref successfulExportCount);
-                }
-                catch (DiscordChatExporterException ex) when (!ex.IsCritical)
-                {
-                    errors.Add((channel, ex.Message));
-                }
-                finally
-                {
-                    operation.Dispose();
-                }
-            }, ParallelLimit.ClampMin(1));
-
-            console.Output.WriteLine();
-
-            foreach (var (channel, error) in errors)
-                console.Error.WriteLine($"Channel '{channel}': {error}");
-
-            console.Output.WriteLine($"Successfully exported {successfulExportCount} channel(s).");
-        }
-    }
-}

DiscordChatExporter.Cli/Commands/Base/TokenCommandBase.cs

@@ -1,26 +1,28 @@
 using System.Threading.Tasks;
 using CliFx;
 using CliFx.Attributes;
-using DiscordChatExporter.Domain.Discord;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Core.Discord;
 
 namespace DiscordChatExporter.Cli.Commands.Base
 {
     public abstract class TokenCommandBase : ICommand
     {
-        [CommandOption("token", 't', IsRequired = true, EnvironmentVariableName = "DISCORD_TOKEN", Description = "Authorization token.")]
+        [CommandOption("token", 't', IsRequired = true, EnvironmentVariable = "DISCORD_TOKEN", Description = "Authentication token.")]
         public string TokenValue { get; init; } = "";
 
-        [CommandOption("bot", 'b', EnvironmentVariableName = "DISCORD_TOKEN_BOT", Description = "Authorize as a bot.")]
+        [CommandOption("bot", 'b', EnvironmentVariable = "DISCORD_TOKEN_BOT", Description = "Authenticate as a bot.")]
         public bool IsBotToken { get; init; }
 
-        protected AuthToken GetAuthToken() => new(
+        private AuthToken GetAuthToken() => new(
             IsBotToken
                 ? AuthTokenType.Bot
                 : AuthTokenType.User,
             TokenValue
         );
 
-        protected DiscordClient GetDiscordClient() => new(GetAuthToken());
+        private DiscordClient? _discordClient;
+        protected DiscordClient Discord => _discordClient ??= new DiscordClient(GetAuthToken());
 
         public abstract ValueTask ExecuteAsync(IConsole console);
     }

DiscordChatExporter.Cli/Commands/ExportAllCommand.cs

@@ -1,36 +1,42 @@
 using System.Collections.Generic;
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("exportall", Description = "Export all accessible channels.")]
-    public class ExportAllCommand : ExportMultipleCommandBase
+    public class ExportAllCommand : ExportCommandBase
     {
         [CommandOption("include-dm", Description = "Include direct message channels.")]
         public bool IncludeDirectMessages { get; init; } = true;
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
+            await base.ExecuteAsync(console);
+
+            // Get channel metadata
+            await console.Output.WriteLineAsync("Fetching channels...");
+
             var channels = new List<Channel>();
 
             // Aggregate channels from all guilds
-            await foreach (var guild in GetDiscordClient().GetUserGuildsAsync())
+            await foreach (var guild in Discord.GetUserGuildsAsync())
             {
                 // Skip DMs if instructed to
                 if (!IncludeDirectMessages && guild.Id == Guild.DirectMessages.Id)
                     continue;
 
-                await foreach (var channel in GetDiscordClient().GetGuildChannelsAsync(guild.Id))
+                await foreach (var channel in Discord.GetGuildChannelsAsync(guild.Id))
                 {
                     channels.Add(channel);
                 }
             }
 
-            await ExportMultipleAsync(console, channels);
+            // Export
+            await ExportAsync(console, channels);
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportChannelCommand.cs

@@ -1,21 +0,0 @@
-using System.Threading.Tasks;
-using CliFx;
-using CliFx.Attributes;
-using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord;
-
-namespace DiscordChatExporter.Cli.Commands
-{
-    [Command("export", Description = "Export a channel.")]
-    public class ExportChannelCommand : ExportCommandBase
-    {
-        [CommandOption("channel", 'c', IsRequired = true, Description = "Channel ID.")]
-        public Snowflake ChannelId { get; init; }
-
-        public override async ValueTask ExecuteAsync(IConsole console)
-        {
-            await base.ExecuteAsync(console);
-            await ExportAsync(console, ChannelId);
-        }
-    }
-}

DiscordChatExporter.Cli/Commands/ExportChannelsCommand.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using CliFx.Attributes;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands.Base;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+
+namespace DiscordChatExporter.Cli.Commands
+{
+    [Command("export", Description = "Export one or multiple channels.")]
+    public class ExportChannelsCommand : ExportCommandBase
+    {
+        // TODO: change this to plural (breaking change)
+        [CommandOption("channel", 'c', IsRequired = true, Description = "Channel ID(s).")]
+        public IReadOnlyList<Snowflake> ChannelIds { get; init; } = Array.Empty<Snowflake>();
+
+        public override async ValueTask ExecuteAsync(IConsole console)
+        {
+            await base.ExecuteAsync(console);
+
+            // Get channel metadata
+            await console.Output.WriteLineAsync("Fetching channel(s)...");
+
+            var channels = new List<Channel>();
+
+            foreach (var channelId in ChannelIds)
+            {
+                var channel = await Discord.GetChannelAsync(channelId);
+                channels.Add(channel);
+            }
+
+            // Export
+            await ExportAsync(console, channels);
+        }
+    }
+}

DiscordChatExporter.Cli/Commands/ExportDirectMessagesCommand.cs

@@ -1,19 +1,25 @@
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("exportdm", Description = "Export all direct message channels.")]
-    public class ExportDirectMessagesCommand : ExportMultipleCommandBase
+    public class ExportDirectMessagesCommand : ExportCommandBase
     {
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var channels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
-            await ExportMultipleAsync(console, channels);
+            await base.ExecuteAsync(console);
+
+            // Get channel metadata
+            await console.Output.WriteLineAsync("Fetching channels...");
+            var channels = await Discord.GetGuildChannelsAsync(Guild.DirectMessages.Id);
+
+            // Export
+            await ExportAsync(console, channels);
         }
     }
 }

DiscordChatExporter.Cli/Commands/ExportGuildCommand.cs

@@ -1,22 +1,28 @@
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
     [Command("exportguild", Description = "Export all channels within specified guild.")]
-    public class ExportGuildCommand : ExportMultipleCommandBase
+    public class ExportGuildCommand : ExportCommandBase
     {
         [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
         public Snowflake GuildId { get; init; }
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var channels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
-            await ExportMultipleAsync(console, channels);
+            await base.ExecuteAsync(console);
+
+            // Get channel metadata
+            await console.Output.WriteLineAsync("Fetching channels...");
+            var channels = await Discord.GetGuildChannelsAsync(GuildId);
+
+            // Export
+            await ExportAsync(console, channels);
         }
     }
 }

DiscordChatExporter.Cli/Commands/GetChannelsCommand.cs

@@ -1,10 +1,11 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
@@ -16,10 +17,23 @@ namespace DiscordChatExporter.Cli.Commands
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var channels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
+            var channels = await Discord.GetGuildChannelsAsync(GuildId);
 
-            foreach (var channel in channels.OrderBy(c => c.Category).ThenBy(c => c.Name))
-                console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
+            foreach (var channel in channels.OrderBy(c => c.Category.Position).ThenBy(c => c.Name))
+            {
+                // Channel ID
+                await console.Output.WriteAsync(channel.Id.ToString());
+
+                // Separator
+                using (console.WithForegroundColor(ConsoleColor.DarkGray))
+                    await console.Output.WriteAsync(" | ");
+
+                // Channel category / name
+                using (console.WithForegroundColor(ConsoleColor.White))
+                    await console.Output.WriteAsync($"{channel.Category} / {channel.Name}");
+
+                await console.Output.WriteLineAsync();
+            }
         }
     }
 }

DiscordChatExporter.Cli/Commands/GetDirectMessageChannelsCommand.cs

@@ -1,10 +1,11 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
@@ -13,10 +14,23 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var channels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
+            var channels = await Discord.GetGuildChannelsAsync(Guild.DirectMessages.Id);
 
-            foreach (var channel in channels.OrderBy(c => c.Category).ThenBy(c => c.Name))
-                console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
+            foreach (var channel in channels.OrderBy(c => c.Name))
+            {
+                // Channel ID
+                await console.Output.WriteAsync(channel.Id.ToString());
+
+                // Separator
+                using (console.WithForegroundColor(ConsoleColor.DarkGray))
+                    await console.Output.WriteAsync(" | ");
+
+                // Channel category / name
+                using (console.WithForegroundColor(ConsoleColor.White))
+                    await console.Output.WriteAsync($"{channel.Category} / {channel.Name}");
+
+                await console.Output.WriteLineAsync();
+            }
         }
     }
 }

DiscordChatExporter.Cli/Commands/GetGuildsCommand.cs

@@ -1,9 +1,10 @@
-using System.Linq;
+using System;
+using System.Linq;
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
@@ -12,10 +13,23 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var guilds = await GetDiscordClient().GetUserGuildsAsync();
+            var guilds = await Discord.GetUserGuildsAsync();
 
             foreach (var guild in guilds.OrderBy(g => g.Name))
-                console.Output.WriteLine($"{guild.Id} | {guild.Name}");
+            {
+                // Guild ID
+                await console.Output.WriteAsync(guild.Id.ToString());
+
+                // Separator
+                using (console.WithForegroundColor(ConsoleColor.DarkGray))
+                    await console.Output.WriteAsync(" | ");
+
+                // Guild name
+                using (console.WithForegroundColor(ConsoleColor.White))
+                    await console.Output.WriteAsync(guild.Name);
+
+                await console.Output.WriteLineAsync();
+            }
         }
     }
 }

DiscordChatExporter.Cli/Commands/GuideCommand.cs

@@ -2,6 +2,7 @@
 using System.Threading.Tasks;
 using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 
 namespace DiscordChatExporter.Cli.Commands
 {
@@ -10,9 +11,9 @@ namespace DiscordChatExporter.Cli.Commands
     {
         public ValueTask ExecuteAsync(IConsole console)
         {
-            console.WithForegroundColor(ConsoleColor.White, () =>
-                console.Output.WriteLine("To get user token:")
-            );
+            using (console.WithForegroundColor(ConsoleColor.White))
+                console.Output.WriteLine("To get user token:");
+
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Press Ctrl+Shift+I to show developer tools");
             console.Output.WriteLine(" 3. Navigate to the Application tab");
@@ -22,18 +23,18 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" *  Automating user accounts is technically against TOS, use at your own risk.");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () =>
-                console.Output.WriteLine("To get bot token:")
-            );
+            using (console.WithForegroundColor(ConsoleColor.White))
+                console.Output.WriteLine("To get bot token:");
+
             console.Output.WriteLine(" 1. Go to Discord developer portal");
             console.Output.WriteLine(" 2. Open your application's settings");
             console.Output.WriteLine(" 3. Navigate to the Bot section on the left");
             console.Output.WriteLine(" 4. Under Token click Copy");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () =>
-                console.Output.WriteLine("To get guild ID or guild channel ID:")
-            );
+            using (console.WithForegroundColor(ConsoleColor.White))
+                console.Output.WriteLine("To get guild ID or guild channel ID:");
+
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Open Settings");
             console.Output.WriteLine(" 3. Go to Appearance section");
@@ -41,9 +42,9 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" 5. Right click on the desired guild or channel and click Copy ID");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White, () =>
-                console.Output.WriteLine("To get direct message channel ID:")
-            );
+            using (console.WithForegroundColor(ConsoleColor.White))
+                console.Output.WriteLine("To get direct message channel ID:");
+
             console.Output.WriteLine(" 1. Open Discord");
             console.Output.WriteLine(" 2. Open the desired direct message channel");
             console.Output.WriteLine(" 3. Press Ctrl+Shift+I to show developer tools");
@@ -52,12 +53,11 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" 6. Copy the first long sequence of numbers inside the URL");
             console.Output.WriteLine();
 
-            console.WithForegroundColor(ConsoleColor.White,
-                () => console.Output.WriteLine("For more information, check out the wiki:")
-            );
-            console.WithForegroundColor(ConsoleColor.Blue,
-                () => console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki")
-            );
+            using (console.WithForegroundColor(ConsoleColor.White))
+                console.Output.WriteLine("For more information, check out the wiki:");
+
+            using (console.WithForegroundColor(ConsoleColor.DarkCyan))
+                console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki");
 
             return default;
         }

DiscordChatExporter.Cli/DiscordChatExporter.Cli.csproj

@@ -6,13 +6,14 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CliFx" Version="1.6.0" />
+    <PackageReference Include="CliFx" Version="2.0.4" />
+    <PackageReference Include="Spectre.Console" Version="0.39.0" />
     <PackageReference Include="Gress" Version="1.2.0" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\DiscordChatExporter.Domain\DiscordChatExporter.Domain.csproj" />
+    <ProjectReference Include="..\DiscordChatExporter.Core\DiscordChatExporter.Core.csproj" />
   </ItemGroup>
 
 </Project>

DiscordChatExporter.Cli/Utils/Extensions/ConsoleExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Threading.Tasks;
+using CliFx.Infrastructure;
+using Spectre.Console;
+
+namespace DiscordChatExporter.Cli.Utils.Extensions
+{
+    internal static class ConsoleExtensions
+    {
+        public static IAnsiConsole CreateAnsiConsole(this IConsole console) => AnsiConsole.Create(
+            new AnsiConsoleSettings
+            {
+                Ansi = AnsiSupport.Detect,
+                ColorSystem = ColorSystemSupport.Detect,
+                Out = new AnsiConsoleOutput(console.Output)
+            }
+        );
+
+        public static Progress CreateProgressTicker(this IConsole console) => console
+            .CreateAnsiConsole()
+            .Progress()
+            .AutoClear(false)
+            .AutoRefresh(true)
+            .HideCompleted(false)
+            .Columns(
+                new TaskDescriptionColumn {Alignment = Justify.Left},
+                new ProgressBarColumn(),
+                new PercentageColumn()
+            );
+
+        public static async ValueTask StartTaskAsync(
+            this ProgressContext progressContext,
+            string description,
+            Func<ProgressTask, ValueTask> performOperationAsync)
+        {
+            var progressTask = progressContext.AddTask(description, new ProgressTaskSettings {MaxValue = 1});
+
+            try
+            {
+                await performOperationAsync(progressTask);
+            }
+            finally
+            {
+                progressTask.StopTask();
+            }
+        }
+    }
+}

DiscordChatExporter.Core/Discord/AuthToken.cs

@@ -1,6 +1,6 @@
 using System.Net.Http.Headers;
 
-namespace DiscordChatExporter.Domain.Discord
+namespace DiscordChatExporter.Core.Discord
 {
     public enum AuthTokenType { User, Bot }
 
@@ -16,7 +16,7 @@ namespace DiscordChatExporter.Domain.Discord
             Value = value;
         }
 
-        public AuthenticationHeaderValue GetAuthorizationHeader() => Type switch
+        public AuthenticationHeaderValue GetAuthenticationHeader() => Type switch
         {
             AuthTokenType.Bot => new AuthenticationHeaderValue("Bot", Value),
             _ => new AuthenticationHeaderValue(Value)

DiscordChatExporter.Core/Discord/Data/Attachment.cs

@@ -2,11 +2,11 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#attachment-object
     public partial class Attachment : IHasId
@@ -32,7 +32,13 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public FileSize FileSize { get; }
 
-        public Attachment(Snowflake id, string url, string fileName, int? width, int? height, FileSize fileSize)
+        public Attachment(
+            Snowflake id,
+            string url,
+            string fileName,
+            int? width,
+            int? height,
+            FileSize fileSize)
         {
             Id = id;
             Url = url;

DiscordChatExporter.Core/Discord/Data/Channel.cs

@@ -1,11 +1,11 @@
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#channel-object-channel-types
     // Order of enum fields needs to match the order in the docs.
@@ -21,7 +21,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
     }
 
     // https://discord.com/developers/docs/resources/channel#channel-object
-    public partial class Channel : IHasId
+    public partial class Channel : IHasId, IHasPosition
     {
         public Snowflake Id { get; }
 
@@ -36,38 +36,53 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public Snowflake GuildId { get; }
 
-        public string Category { get; }
+        public ChannelCategory Category { get; }
 
         public string Name { get; }
 
+        public int? Position { get; }
+
         public string? Topic { get; }
 
-        public Channel(Snowflake id, ChannelType type, Snowflake guildId, string category, string name, string? topic)
+        public Channel(
+            Snowflake id,
+            ChannelType type,
+            Snowflake guildId,
+            ChannelCategory? category,
+            string name,
+            int? position,
+            string? topic)
         {
             Id = id;
             Type = type;
             GuildId = guildId;
-            Category = category;
+            Category = category ?? GetFallbackCategory(type);
             Name = name;
+            Position = position;
             Topic = topic;
         }
 
         public override string ToString() => Name;
+
     }
 
     public partial class Channel
     {
-        private static string GetDefaultCategory(ChannelType channelType) => channelType switch
-        {
-            ChannelType.GuildTextChat => "Text",
-            ChannelType.DirectTextChat => "Private",
-            ChannelType.DirectGroupTextChat => "Group",
-            ChannelType.GuildNews => "News",
-            ChannelType.GuildStore => "Store",
-            _ => "Default"
-        };
+        private static ChannelCategory GetFallbackCategory(ChannelType channelType) => new(
+            Snowflake.Zero,
+            channelType switch
+            {
+                ChannelType.GuildTextChat => "Text",
+                ChannelType.DirectTextChat => "Private",
+                ChannelType.DirectGroupTextChat => "Group",
+                ChannelType.GuildNews => "News",
+                ChannelType.GuildStore => "Store",
+                _ => "Default"
+            },
+            0
+        );
 
-        public static Channel Parse(JsonElement json, string? category = null)
+        public static Channel Parse(JsonElement json, ChannelCategory? category = null, int? position = null)
         {
             var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
@@ -80,12 +95,15 @@ namespace DiscordChatExporter.Domain.Discord.Models
                 json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
                 id.ToString();
 
+            position ??= json.GetPropertyOrNull("position")?.GetInt32();
+
             return new Channel(
                 id,
                 type,
                 guildId ?? Guild.DirectMessages.Id,
-                category ?? GetDefaultCategory(type),
+                category ?? GetFallbackCategory(type),
                 name,
+                position,
                 topic
             );
         }

DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs

@@ -0,0 +1,49 @@
+using System.Linq;
+using System.Text.Json;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
+using JsonExtensions.Reading;
+using Tyrrrz.Extensions;
+
+namespace DiscordChatExporter.Core.Discord.Data
+{
+    public partial class ChannelCategory : IHasId, IHasPosition
+    {
+        public Snowflake Id { get; }
+
+        public string Name { get; }
+
+        public int? Position { get; }
+
+        public ChannelCategory(Snowflake id, string name, int? position)
+        {
+            Id = id;
+            Name = name;
+            Position = position;
+        }
+
+        public override string ToString() => Name;
+
+    }
+
+    public partial class ChannelCategory
+    {
+        public static ChannelCategory Parse(JsonElement json, int? position = null)
+        {
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            position ??= json.GetPropertyOrNull("position")?.GetInt32();
+
+            var name = json.GetPropertyOrNull("name")?.GetString() ??
+                json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
+                id.ToString();
+
+            return new ChannelCategory(
+                id,
+                name,
+                position
+            );
+        }
+
+        public static ChannelCategory Empty { get; } = new(Snowflake.Zero, "<unknown category>", 0);
+    }
+}

DiscordChatExporter.Core/Discord/Data/Common/FileSize.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace DiscordChatExporter.Domain.Discord.Models.Common
+namespace DiscordChatExporter.Core.Discord.Data.Common
 {
     // Loosely based on https://github.com/omar/ByteSize (MIT license)
     public readonly partial struct FileSize
@@ -10,19 +10,11 @@ namespace DiscordChatExporter.Domain.Discord.Models.Common
         public double TotalKiloBytes => TotalBytes / 1024.0;
         public double TotalMegaBytes => TotalKiloBytes / 1024.0;
         public double TotalGigaBytes => TotalMegaBytes / 1024.0;
-        public double TotalTeraBytes => TotalGigaBytes / 1024.0;
-        public double TotalPetaBytes => TotalTeraBytes / 1024.0;
 
         public FileSize(long bytes) => TotalBytes = bytes;
 
         private double GetLargestWholeNumberValue()
         {
-            if (Math.Abs(TotalPetaBytes) >= 1)
-                return TotalPetaBytes;
-
-            if (Math.Abs(TotalTeraBytes) >= 1)
-                return TotalTeraBytes;
-
             if (Math.Abs(TotalGigaBytes) >= 1)
                 return TotalGigaBytes;
 
@@ -37,12 +29,6 @@ namespace DiscordChatExporter.Domain.Discord.Models.Common
 
         private string GetLargestWholeNumberSymbol()
         {
-            if (Math.Abs(TotalPetaBytes) >= 1)
-                return "PB";
-
-            if (Math.Abs(TotalTeraBytes) >= 1)
-                return "TB";
-
             if (Math.Abs(TotalGigaBytes) >= 1)
                 return "GB";
 

DiscordChatExporter.Core/Discord/Data/Common/IHasId.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Discord.Models.Common
+namespace DiscordChatExporter.Core.Discord.Data.Common
 {
     public interface IHasId
     {

DiscordChatExporter.Core/Discord/Data/Common/IHasPosition.cs

@@ -0,0 +1,7 @@
+namespace DiscordChatExporter.Core.Discord.Data.Common
+{
+    public interface IHasPosition
+    {
+        int? Position { get; }
+    }
+}

DiscordChatExporter.Core/Discord/Data/Common/IdBasedEqualityComparer.cs

@@ -1,7 +1,6 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 
-namespace DiscordChatExporter.Domain.Discord.Models.Common
+namespace DiscordChatExporter.Core.Discord.Data.Common
 {
     public partial class IdBasedEqualityComparer : IEqualityComparer<IHasId>
     {

DiscordChatExporter.Core/Discord/Data/Embed.cs

@@ -3,11 +3,10 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Internal.Extensions;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#embed-object
     public partial class Embed

DiscordChatExporter.Core/Discord/Data/EmbedAuthor.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#embed-object-embed-author-structure
     public partial class EmbedAuthor

DiscordChatExporter.Core/Discord/Data/EmbedField.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#embed-object-embed-field-structure
     public partial class EmbedField

DiscordChatExporter.Core/Discord/Data/EmbedFooter.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#embed-object-embed-footer-structure
     public partial class EmbedFooter

DiscordChatExporter.Core/Discord/Data/EmbedImage.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#embed-object-embed-image-structure
     public partial class EmbedImage

DiscordChatExporter.Core/Discord/Data/Emoji.cs

@@ -5,7 +5,7 @@ using System.Text.Json;
 using JsonExtensions.Reading;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/emoji#emoji-object
     public partial class Emoji

DiscordChatExporter.Core/Discord/Data/Guild.cs

@@ -1,8 +1,8 @@
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/guild#guild-object
     public partial class Guild : IHasId
@@ -25,7 +25,11 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
     public partial class Guild
     {
-        public static Guild DirectMessages { get; } = new(Snowflake.Zero, "Direct Messages", GetDefaultIconUrl());
+        public static Guild DirectMessages { get; } = new(
+            Snowflake.Zero,
+            "Direct Messages",
+            GetDefaultIconUrl()
+        );
 
         private static string GetDefaultIconUrl() =>
             "https://cdn.discordapp.com/embed/avatars/0.png";

DiscordChatExporter.Core/Discord/Data/Member.cs

@@ -2,11 +2,11 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/guild#guild-member-object
     public partial class Member : IHasId
@@ -31,7 +31,11 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
     public partial class Member
     {
-        public static Member CreateForUser(User user) => new(user, null, Array.Empty<Snowflake>());
+        public static Member CreateForUser(User user) => new(
+            user,
+            null,
+            Array.Empty<Snowflake>()
+        );
 
         public static Member Parse(JsonElement json)
         {

DiscordChatExporter.Core/Discord/Data/Message.cs

@@ -2,11 +2,11 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#message-object-message-types
     public enum MessageType

DiscordChatExporter.Core/Discord/Data/MessageReference.cs

@@ -1,8 +1,8 @@
 using System.Text.Json;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#message-object-message-reference-structure
     public partial class MessageReference

DiscordChatExporter.Core/Discord/Data/Reaction.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/channel#reaction-object
     public partial class Reaction

DiscordChatExporter.Core/Discord/Data/Role.cs

@@ -1,11 +1,10 @@
 using System.Drawing;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Internal.Extensions;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/topics/permissions#role-object
     public partial class Role : IHasId
@@ -18,7 +17,11 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public Color? Color { get; }
 
-        public Role(Snowflake id, string name, int position, Color? color)
+        public Role(
+            Snowflake id,
+            string name,
+            int position,
+            Color? color)
         {
             Id = id;
             Name = name;

DiscordChatExporter.Core/Discord/Data/User.cs

@@ -1,10 +1,10 @@
 using System;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
 
-namespace DiscordChatExporter.Domain.Discord.Models
+namespace DiscordChatExporter.Core.Discord.Data
 {
     // https://discord.com/developers/docs/resources/user#user-object
     public partial class User : IHasId
@@ -15,13 +15,20 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public int Discriminator { get; }
 
+        public string DiscriminatorFormatted => $"{Discriminator:0000}";
+
         public string Name { get; }
 
-        public string FullName => $"{Name}#{Discriminator:0000}";
+        public string FullName => $"{Name}#{DiscriminatorFormatted}";
 
         public string AvatarUrl { get; }
 
-        public User(Snowflake id, bool isBot, int discriminator, string name, string avatarUrl)
+        public User(
+            Snowflake id,
+            bool isBot,
+            int discriminator,
+            string name,
+            string avatarUrl)
         {
             Id = id;
             IsBot = isBot;

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -5,14 +5,15 @@ using System.Net;
 using System.Net.Http;
 using System.Text.Json;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exceptions;
-using DiscordChatExporter.Domain.Internal;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exceptions;
+using DiscordChatExporter.Core.Utils;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Http;
 using JsonExtensions.Reading;
+using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord
+namespace DiscordChatExporter.Core.Discord
 {
     public class DiscordClient
     {
@@ -34,7 +35,7 @@ namespace DiscordChatExporter.Domain.Discord
             await Http.ResponsePolicy.ExecuteAsync(async () =>
             {
                 using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(_baseUri, url));
-                request.Headers.Authorization = _token.GetAuthorizationHeader();
+                request.Headers.Authorization = _token.GetAuthenticationHeader();
 
                 return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
             });
@@ -117,26 +118,34 @@ namespace DiscordChatExporter.Domain.Discord
             {
                 var response = await GetJsonResponseAsync($"guilds/{guildId}/channels");
 
-                var categories = response
+                var orderedResponse = response
                     .EnumerateArray()
-                    .ToDictionary(
-                        j => j.GetProperty("id").GetString(),
-                        j => j.GetProperty("name").GetString()
-                    );
+                    .OrderBy(j => j.GetProperty("position").GetInt32())
+                    .ThenBy(j => ulong.Parse(j.GetProperty("id").GetString()))
+                    .ToArray();
 
-                foreach (var channelJson in response.EnumerateArray())
+                var categories = orderedResponse
+                    .Where(j => j.GetProperty("type").GetInt32() == (int)ChannelType.GuildCategory)
+                    .Select((j, index) => ChannelCategory.Parse(j, index + 1))
+                    .ToDictionary(j => j.Id.ToString());
+
+                var position = 0;
+
+                foreach (var channelJson in orderedResponse)
                 {
                     var parentId = channelJson.GetPropertyOrNull("parent_id")?.GetString();
                     var category = !string.IsNullOrWhiteSpace(parentId)
                         ? categories.GetValueOrDefault(parentId)
                         : null;
 
-                    var channel = Channel.Parse(channelJson, category);
+                    var channel = Channel.Parse(channelJson, category, position);
 
                     // Skip non-text channels
                     if (!channel.IsTextChannel)
                         continue;
 
+                    position++;
+
                     yield return channel;
                 }
             }
@@ -162,10 +171,22 @@ namespace DiscordChatExporter.Domain.Discord
             return response?.Pipe(Member.Parse);
         }
 
-        private async ValueTask<string> GetChannelCategoryAsync(Snowflake channelParentId)
+        public async ValueTask<ChannelCategory> GetChannelCategoryAsync(Snowflake channelId)
         {
-            var response = await GetJsonResponseAsync($"channels/{channelParentId}");
-            return response.GetProperty("name").GetString();
+            try
+            {
+                var response = await GetJsonResponseAsync($"channels/{channelId}");
+                return ChannelCategory.Parse(response);
+            }
+            /***
+             * In some cases, the Discord API returns an empty body when requesting some channel category info.
+             * Instead, we use an empty channel category as a fallback.
+             */
+            catch (DiscordChatExporterException)
+            {
+                return ChannelCategory.Empty;
+            }
+
         }
 
         public async ValueTask<Channel> GetChannelAsync(Snowflake channelId)
@@ -174,7 +195,7 @@ namespace DiscordChatExporter.Domain.Discord
 
             var parentId = response.GetPropertyOrNull("parent_id")?.GetString().Pipe(Snowflake.Parse);
 
-            var category = parentId != null
+            var category = parentId is not null
                 ? await GetChannelCategoryAsync(parentId.Value)
                 : null;
 
@@ -204,7 +225,7 @@ namespace DiscordChatExporter.Domain.Discord
             // will not appear in the output.
             // Additionally, it provides the date of the last message, which is used to calculate progress.
             var lastMessage = await TryGetLastMessageAsync(channelId, before);
-            if (lastMessage == null || lastMessage.Timestamp < after?.ToDate())
+            if (lastMessage is null || lastMessage.Timestamp < after?.ToDate())
                 yield break;
 
             // Keep track of first message in range in order to calculate progress
@@ -239,11 +260,23 @@ namespace DiscordChatExporter.Domain.Discord
                     if (message.Timestamp > lastMessage.Timestamp)
                         yield break;
 
-                    // Report progress based on the duration of parsed messages divided by total
-                    progress?.Report(
-                        (message.Timestamp - firstMessage.Timestamp) /
-                        (lastMessage.Timestamp - firstMessage.Timestamp)
-                    );
+                    // Report progress based on the duration of exported messages divided by total
+                    if (progress is not null)
+                    {
+                        var exportedDuration = (message.Timestamp - firstMessage.Timestamp).Duration();
+                        var totalDuration = (lastMessage.Timestamp - firstMessage.Timestamp).Duration();
+
+                        if (totalDuration > TimeSpan.Zero)
+                        {
+                            progress.Report(exportedDuration / totalDuration);
+                        }
+                        // Avoid division by zero if all messages have the exact same timestamp
+                        // (which can happen easily if there's only one message in the channel)
+                        else
+                        {
+                            progress.Report(1);
+                        }
+                    }
 
                     yield return message;
                     currentAfter = message.Id;

DiscordChatExporter.Core/Discord/Snowflake.cs

@@ -2,7 +2,7 @@
 using System.Globalization;
 using System.Text.RegularExpressions;
 
-namespace DiscordChatExporter.Domain.Discord
+namespace DiscordChatExporter.Core.Discord
 {
     public readonly partial struct Snowflake
     {
@@ -32,7 +32,7 @@ namespace DiscordChatExporter.Domain.Discord
                 return null;
 
             // As number
-            if (Regex.IsMatch(str, @"^\d{15,}$") &&
+            if (Regex.IsMatch(str, @"^\d+$") &&
                 ulong.TryParse(str, NumberStyles.Number, formatProvider, out var value))
             {
                 return new Snowflake(value);
@@ -48,7 +48,7 @@ namespace DiscordChatExporter.Domain.Discord
         }
 
         public static Snowflake Parse(string str, IFormatProvider? formatProvider) =>
-            TryParse(str, formatProvider) ?? throw new FormatException($"Invalid snowflake: {str}.");
+            TryParse(str, formatProvider) ?? throw new FormatException($"Invalid snowflake '{str}'.");
 
         public static Snowflake Parse(string str) => Parse(str, null);
     }

DiscordChatExporter.Core/DiscordChatExporter.Core.csproj

@@ -6,8 +6,8 @@
 
   <ItemGroup>
     <PackageReference Include="JsonExtensions" Version="1.0.1" />
-    <PackageReference Include="MiniRazor" Version="2.0.3" />
-    <PackageReference Include="Polly" Version="7.2.1" />
+    <PackageReference Include="MiniRazor.CodeGen" Version="2.1.2" />
+    <PackageReference Include="Polly" Version="7.2.2" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>
 

DiscordChatExporter.Core/Exceptions/DiscordChatExporterException.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Net.Http;
 
-namespace DiscordChatExporter.Domain.Exceptions
+namespace DiscordChatExporter.Core.Exceptions
 {
     public partial class DiscordChatExporterException : Exception
     {
@@ -21,35 +21,25 @@ namespace DiscordChatExporter.Domain.Exceptions
             var message = $@"
 Failed to perform an HTTP request.
 
+[Request]
 {response.RequestMessage}
 
+[Response]
 {response}";
 
             return new DiscordChatExporterException(message.Trim(), true);
         }
 
-        internal static DiscordChatExporterException Unauthorized()
-        {
-            const string message = "Authentication token is invalid.";
-            return new DiscordChatExporterException(message);
-        }
+        internal static DiscordChatExporterException Unauthorized() =>
+            new("Authentication token is invalid.");
 
-        internal static DiscordChatExporterException Forbidden()
-        {
-            const string message = "Access is forbidden.";
-            return new DiscordChatExporterException(message);
-        }
+        internal static DiscordChatExporterException Forbidden() =>
+            new("Access is forbidden.");
 
-        internal static DiscordChatExporterException NotFound()
-        {
-            const string message = "Requested resource does not exist.";
-            return new DiscordChatExporterException(message);
-        }
+        internal static DiscordChatExporterException NotFound() =>
+            new("Requested resource does not exist.");
 
-        internal static DiscordChatExporterException ChannelIsEmpty()
-        {
-            var message = $"No messages for the specified period.";
-            return new DiscordChatExporterException(message);
-        }
+        internal static DiscordChatExporterException ChannelIsEmpty() =>
+            new("No messages found for the specified period.");
     }
 }

DiscordChatExporter.Core/Exporting/ChannelExporter.cs

@@ -2,13 +2,13 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Discord.Models.Common;
-using DiscordChatExporter.Domain.Exceptions;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Exceptions;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     public class ChannelExporter
     {

DiscordChatExporter.Core/Exporting/ExportContext.cs

@@ -5,12 +5,12 @@ using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Utils.Extensions;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     internal class ExportContext
     {
@@ -57,7 +57,7 @@ namespace DiscordChatExporter.Domain.Exporting
             var roles = member?.RoleIds.Join(Roles, i => i, r => r.Id, (_, role) => role);
 
             return roles?
-                .Where(r => r.Color != null)
+                .Where(r => r.Color is not null)
                 .OrderByDescending(r => r.Position)
                 .Select(r => r.Color)
                 .FirstOrDefault();

DiscordChatExporter.Core/Exporting/ExportFormat.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     public enum ExportFormat
     {

DiscordChatExporter.Core/Exporting/ExportRequest.cs

@@ -1,10 +1,13 @@
-using System.IO;
+using System;
+using System.IO;
 using System.Text;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Internal;
+using System.Text.RegularExpressions;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Partitioning;
+using DiscordChatExporter.Core.Utils;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     public partial class ExportRequest
     {
@@ -26,7 +29,7 @@ namespace DiscordChatExporter.Domain.Exporting
 
         public Snowflake? Before { get; }
 
-        public int? PartitionLimit { get; }
+        public PartitionLimit PartitionLimit { get; }
 
         public bool ShouldDownloadMedia { get; }
 
@@ -41,7 +44,7 @@ namespace DiscordChatExporter.Domain.Exporting
             ExportFormat format,
             Snowflake? after,
             Snowflake? before,
-            int? partitionLimit,
+            PartitionLimit partitionLimit,
             bool shouldDownloadMedia,
             bool shouldReuseMedia,
             string dateFormat)
@@ -81,6 +84,26 @@ namespace DiscordChatExporter.Domain.Exporting
             Snowflake? after = null,
             Snowflake? before = null)
         {
+
+            // Formats path
+            outputPath = Regex.Replace(outputPath, "%.", m =>
+                PathEx.EscapePath(m.Value switch
+                {
+                    "%g" => guild.Id.ToString(),
+                    "%G" => guild.Name,
+                    "%t" => channel.Category.Id.ToString(),
+                    "%T" => channel.Category.Name,
+                    "%c" => channel.Id.ToString(),
+                    "%C" => channel.Name,
+                    "%p" => channel.Position?.ToString() ?? "0",
+                    "%P" => channel.Category.Position?.ToString() ?? "0",
+                    "%a" => (after ?? Snowflake.Zero).ToDate().ToString("yyyy-MM-dd"),
+                    "%b" => (before?.ToDate() ?? DateTime.Now).ToString("yyyy-MM-dd"),
+                    "%%" => "%",
+                    _ => m.Value
+                })
+            );
+
             // Output is a directory
             if (Directory.Exists(outputPath) || string.IsNullOrWhiteSpace(Path.GetExtension(outputPath)))
             {
@@ -102,20 +125,20 @@ namespace DiscordChatExporter.Domain.Exporting
             var buffer = new StringBuilder();
 
             // Guild and channel names
-            buffer.Append($"{guild.Name} - {channel.Category} - {channel.Name} [{channel.Id}]");
+            buffer.Append($"{guild.Name} - {channel.Category.Name} - {channel.Name} [{channel.Id}]");
 
             // Date range
-            if (after != null || before != null)
+            if (after is not null || before is not null)
             {
                 buffer.Append(" (");
 
                 // Both 'after' and 'before' are set
-                if (after != null && before != null)
+                if (after is not null && before is not null)
                 {
                     buffer.Append($"{after?.ToDate():yyyy-MM-dd} to {before?.ToDate():yyyy-MM-dd}");
                 }
                 // Only 'after' is set
-                else if (after != null)
+                else if (after is not null)
                 {
                     buffer.Append($"after {after?.ToDate():yyyy-MM-dd}");
                 }

DiscordChatExporter.Core/Exporting/MediaDownloader.cs

@@ -7,11 +7,10 @@ using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Internal;
-using DiscordChatExporter.Domain.Internal.Extensions;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     internal partial class MediaDownloader
     {
@@ -63,7 +62,7 @@ namespace DiscordChatExporter.Domain.Exporting
                         : (DateTimeOffset?) null
                 );
 
-                if (lastModified != null)
+                if (lastModified is not null)
                 {
                     File.SetCreationTimeUtc(filePath, lastModified.Value.UtcDateTime);
                     File.SetLastWriteTimeUtc(filePath, lastModified.Value.UtcDateTime);

DiscordChatExporter.Core/Exporting/MessageExporter.cs

@@ -1,16 +1,15 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting.Writers;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Writers;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     internal partial class MessageExporter : IAsyncDisposable
     {
         private readonly ExportContext _context;
 
-        private long _messageCount;
         private int _partitionIndex;
         private MessageWriter? _writer;
 
@@ -19,15 +18,9 @@ namespace DiscordChatExporter.Domain.Exporting
             _context = context;
         }
 
-        private bool IsPartitionLimitReached() =>
-            _messageCount > 0 &&
-            _context.Request.PartitionLimit != null &&
-            _context.Request.PartitionLimit != 0 &&
-            _messageCount % _context.Request.PartitionLimit == 0;
-
         private async ValueTask ResetWriterAsync()
         {
-            if (_writer != null)
+            if (_writer is not null)
             {
                 await _writer.WritePostambleAsync();
                 await _writer.DisposeAsync();
@@ -38,14 +31,15 @@ namespace DiscordChatExporter.Domain.Exporting
         private async ValueTask<MessageWriter> GetWriterAsync()
         {
             // Ensure partition limit has not been exceeded
-            if (IsPartitionLimitReached())
+            if (_writer is not null &&
+                _context.Request.PartitionLimit.IsReached(_writer.MessagesWritten, _writer.BytesWritten))
             {
                 await ResetWriterAsync();
                 _partitionIndex++;
             }
 
             // Writer is still valid - return
-            if (_writer != null)
+            if (_writer is not null)
                 return _writer;
 
             var filePath = GetPartitionFilePath(_context.Request.OutputBaseFilePath, _partitionIndex);
@@ -64,7 +58,6 @@ namespace DiscordChatExporter.Domain.Exporting
         {
             var writer = await GetWriterAsync();
             await writer.WriteMessageAsync(message);
-            _messageCount++;
         }
 
         public async ValueTask DisposeAsync() => await ResetWriterAsync();
@@ -72,9 +65,7 @@ namespace DiscordChatExporter.Domain.Exporting
 
     internal partial class MessageExporter
     {
-        private static string GetPartitionFilePath(
-            string baseFilePath,
-            int partitionIndex)
+        private static string GetPartitionFilePath(string baseFilePath, int partitionIndex)
         {
             // First partition - don't change file name
             if (partitionIndex <= 0)

DiscordChatExporter.Core/Exporting/Partitioning/FileSizePartitionLimit.cs

@@ -0,0 +1,12 @@
+namespace DiscordChatExporter.Core.Exporting.Partitioning
+{
+    public class FileSizePartitionLimit : PartitionLimit
+    {
+        private readonly long _limit;
+
+        public FileSizePartitionLimit(long limit) => _limit = limit;
+
+        public override bool IsReached(long messagesWritten, long bytesWritten) =>
+            bytesWritten >= _limit;
+    }
+}

DiscordChatExporter.Core/Exporting/Partitioning/MessageCountPartitionLimit.cs

@@ -0,0 +1,12 @@
+namespace DiscordChatExporter.Core.Exporting.Partitioning
+{
+    public class MessageCountPartitionLimit : PartitionLimit
+    {
+        private readonly long _limit;
+
+        public MessageCountPartitionLimit(long limit) => _limit = limit;
+
+        public override bool IsReached(long messagesWritten, long bytesWritten) =>
+            messagesWritten >= _limit;
+    }
+}

DiscordChatExporter.Core/Exporting/Partitioning/NullPartitionLimit.cs

@@ -0,0 +1,9 @@
+namespace DiscordChatExporter.Core.Exporting.Partitioning
+{
+    public class NullPartitionLimit : PartitionLimit
+    {
+        public static NullPartitionLimit Instance { get; } = new();
+
+        public override bool IsReached(long messagesWritten, long bytesWritten) => false;
+    }
+}

DiscordChatExporter.Core/Exporting/Partitioning/PartitionLimit.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Globalization;
+using System.Text.RegularExpressions;
+
+namespace DiscordChatExporter.Core.Exporting.Partitioning
+{
+    public abstract partial class PartitionLimit
+    {
+        public abstract bool IsReached(long messagesWritten, long bytesWritten);
+    }
+
+    public partial class PartitionLimit
+    {
+        private static long? TryParseFileSizeBytes(string value, IFormatProvider? formatProvider = null)
+        {
+            var match = Regex.Match(value, @"^\s*(\d+[\.,]?\d*)\s*(\w)?b\s*$", RegexOptions.IgnoreCase);
+
+            // Number part
+            if (!double.TryParse(
+                match.Groups[1].Value,
+                NumberStyles.Float,
+                formatProvider,
+                out var number))
+            {
+                return null;
+            }
+
+            // Magnitude part
+            var magnitude = match.Groups[2].Value.ToUpperInvariant() switch
+            {
+                "G" => 1_000_000_000,
+                "M" => 1_000_000,
+                "K" => 1_000,
+                "" => 1,
+                _ => -1
+            };
+
+            if (magnitude < 0)
+            {
+                return null;
+            }
+
+            return (long) (number * magnitude);
+        }
+
+        public static PartitionLimit? TryParse(string value, IFormatProvider? formatProvider = null)
+        {
+            var fileSizeLimit = TryParseFileSizeBytes(value, formatProvider);
+            if (fileSizeLimit is not null)
+                return new FileSizePartitionLimit(fileSizeLimit.Value);
+
+            if (int.TryParse(value, NumberStyles.Integer, formatProvider, out var messageCountLimit))
+                return new MessageCountPartitionLimit(messageCountLimit);
+
+            return null;
+        }
+
+        public static PartitionLimit Parse(string value, IFormatProvider? formatProvider = null) =>
+            TryParse(value, formatProvider) ?? throw new FormatException($"Invalid partition limit '{value}'.");
+    }
+}

DiscordChatExporter.Core/Exporting/Writers/CsvMessageWriter.cs

@@ -2,11 +2,11 @@
 using System.IO;
 using System.Text;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal partial class CsvMessageWriter : MessageWriter
     {
@@ -58,6 +58,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WriteMessageAsync(Message message)
         {
+            await base.WriteMessageAsync(message);
+
             // Author ID
             await _writer.WriteAsync(CsvEncode(message.Author.Id.ToString()));
             await _writer.WriteAsync(',');

DiscordChatExporter.Core/Exporting/Writers/Html/MessageGroup.cs

@@ -1,9 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers.Html
+namespace DiscordChatExporter.Core.Exporting.Writers.Html
 {
     // Used for grouping contiguous messages in HTML export
     internal partial class MessageGroup

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

@@ -1,8 +1,8 @@
 @using System
 @using System.Linq
 @using System.Threading.Tasks
-@namespace DiscordChatExporter.Domain.Exporting.Writers.Html
-@inherits MiniRazor.TemplateBase<DiscordChatExporter.Domain.Exporting.Writers.Html.MessageGroupTemplateContext>
+@namespace DiscordChatExporter.Core.Exporting.Writers.Html
+@inherits MiniRazor.TemplateBase<DiscordChatExporter.Core.Exporting.Writers.Html.MessageGroupTemplateContext>
 
 @{
     string FormatDate(DateTimeOffset date) => Model.ExportContext.FormatDate(date);
@@ -17,7 +17,7 @@
 
     var userColor = Model.ExportContext.TryGetUserColor(Model.MessageGroup.Author.Id);
 
-    var userColorStyle = userColor != null
+    var userColorStyle = userColor is not null
         ? $"color: rgb({userColor?.R},{userColor?.G},{userColor?.B})"
         : null;
 
@@ -25,19 +25,19 @@
         ? Model.MessageGroup.Author.Name
         : userMember?.Nick ?? Model.MessageGroup.Author.Name;
 
-    var referencedUserMember = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserMember = Model.MessageGroup.ReferencedMessage is not null
         ? Model.ExportContext.TryGetMember(Model.MessageGroup.ReferencedMessage.Author.Id)
         : null;
 
-    var referencedUserColor = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserColor = Model.MessageGroup.ReferencedMessage is not null
         ? Model.ExportContext.TryGetUserColor(Model.MessageGroup.ReferencedMessage.Author.Id)
         : null;
 
-    var referencedUserColorStyle = referencedUserColor != null
+    var referencedUserColorStyle = referencedUserColor is not null
         ? $"color: rgb({referencedUserColor?.R},{referencedUserColor?.G},{referencedUserColor?.B})"
         : null;
 
-    var referencedUserNick = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserNick = Model.MessageGroup.ReferencedMessage is not null
         ? Model.MessageGroup.ReferencedMessage.Author.IsBot
             ? Model.MessageGroup.ReferencedMessage.Author.Name
             : referencedUserMember?.Nick ?? Model.MessageGroup.ReferencedMessage.Author.Name
@@ -45,12 +45,12 @@
 }
 
 <div class="chatlog__message-group">
-    @if (Model.MessageGroup.Reference != null)
+    @if (Model.MessageGroup.Reference is not null)
     {
         <div class="chatlog__reference-symbol">
         </div>
         <div class="chatlog__reference">
-            @if (Model.MessageGroup.ReferencedMessage != null)
+            @if (Model.MessageGroup.ReferencedMessage is not null)
             {
                 <img class="chatlog__reference-avatar" src="@await ResolveUrlAsync(Model.MessageGroup.ReferencedMessage.Author.AvatarUrl)" alt="Avatar">
                 <span class="chatlog__reference-name" title="@Model.MessageGroup.ReferencedMessage.Author.FullName" style="@referencedUserColorStyle">@referencedUserNick</span>
@@ -66,7 +66,7 @@
                         }
                     </span>
 
-                    @if (Model.MessageGroup.ReferencedMessage.EditedTimestamp != null)
+                    @if (Model.MessageGroup.ReferencedMessage.EditedTimestamp is not null)
                     {
                         <span class="chatlog__reference-edited-timestamp" title="@FormatDate(Model.MessageGroup.ReferencedMessage.EditedTimestamp.Value)">(edited)</span>
                     }
@@ -98,13 +98,13 @@
             var isPinnedStyle = message.IsPinned ? "chatlog__message--pinned" : null;
 
             <div class="chatlog__message @isPinnedStyle" data-message-id="@message.Id" id="message-@message.Id">
-                @if (!string.IsNullOrWhiteSpace(message.Content) || message.EditedTimestamp != null)
+                @if (!string.IsNullOrWhiteSpace(message.Content) || message.EditedTimestamp is not null)
                 {
                     <div class="chatlog__content">
                         <div class="markdown">
                             <span class="preserve-whitespace">@Raw(FormatMarkdown(message.Content))</span>
 
-                            @if (message.EditedTimestamp != null)
+                            @if (message.EditedTimestamp is not null)
                             {
                                 <span class="chatlog__edited-timestamp" title="@FormatDate(message.EditedTimestamp.Value)">(edited)</span>
                             }
@@ -162,7 +162,7 @@
                 @foreach (var embed in message.Embeds)
                 {
                     <div class="chatlog__embed">
-                        @if (embed.Color != null)
+                        @if (embed.Color is not null)
                         {
                             var embedColorStyle = $"background-color: rgba({embed.Color?.R},{embed.Color?.G},{embed.Color?.B},{embed.Color?.A})";
                             <div class="chatlog__embed-color-pill" style="@embedColorStyle"></div>
@@ -175,7 +175,7 @@
                         <div class="chatlog__embed-content-container">
                             <div class="chatlog__embed-content">
                                 <div class="chatlog__embed-text">
-                                    @if (embed.Author != null)
+                                    @if (embed.Author is not null)
                                     {
                                         <div class="chatlog__embed-author">
                                             @if (!string.IsNullOrWhiteSpace(embed.Author.IconUrl))
@@ -249,7 +249,7 @@
                                     }
                                 </div>
 
-                                @if (embed.Thumbnail != null)
+                                @if (embed.Thumbnail is not null)
                                 {
                                     <div class="chatlog__embed-thumbnail-container">
                                         <a class="chatlog__embed-thumbnail-link" href="@await ResolveUrlAsync(embed.Thumbnail.Url)">
@@ -259,7 +259,7 @@
                                 }
                             </div>
 
-                            @if (embed.Image != null)
+                            @if (embed.Image is not null)
                             {
                                 <div class="chatlog__embed-image-container">
                                     <a class="chatlog__embed-image-link" href="@await ResolveUrlAsync(embed.Image.Url)">
@@ -268,7 +268,7 @@
                                 </div>
                             }
 
-                            @if (embed.Footer != null || embed.Timestamp != null)
+                            @if (embed.Footer is not null || embed.Timestamp is not null)
                             {
                                 <div class="chatlog__embed-footer">
                                     @if (!string.IsNullOrWhiteSpace(embed.Footer?.IconUrl))
@@ -282,12 +282,12 @@
                                             @embed.Footer.Text
                                         }
 
-                                        @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text) && embed.Timestamp != null)
+                                        @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text) && embed.Timestamp is not null)
                                         {
                                             @(" • ")
                                         }
 
-                                        @if (embed.Timestamp != null)
+                                        @if (embed.Timestamp is not null)
                                         {
                                             @FormatDate(embed.Timestamp.Value)
                                         }

DiscordChatExporter.Core/Exporting/Writers/Html/MessageGroupTemplateContext.cs

@@ -1,6 +1,6 @@
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers.Html
+namespace DiscordChatExporter.Core.Exporting.Writers.Html
 {
     internal class MessageGroupTemplateContext
     {

DiscordChatExporter.Core/Exporting/Writers/Html/PostambleTemplate.cshtml

@@ -0,0 +1,12 @@
+@namespace DiscordChatExporter.Core.Exporting.Writers.Html
+@inherits MiniRazor.TemplateBase<DiscordChatExporter.Core.Exporting.Writers.Html.PostambleTemplateContext>
+
+</div>
+
+<div class="postamble">
+    <div class="postamble__entry">Exported @Model.MessagesWritten.ToString("N0") message(s)</div>
+</div>
+
+</body>
+
+</html>

DiscordChatExporter.Core/Exporting/Writers/Html/PostambleTemplateContext.cs

@@ -0,0 +1,15 @@
+namespace DiscordChatExporter.Core.Exporting.Writers.Html
+{
+    internal class PostambleTemplateContext
+    {
+        public ExportContext ExportContext { get; }
+
+        public long MessagesWritten { get; }
+
+        public PostambleTemplateContext(ExportContext exportContext, long messagesWritten)
+        {
+            ExportContext = exportContext;
+            MessagesWritten = messagesWritten;
+        }
+    }
+}

DiscordChatExporter.Core/Exporting/Writers/Html/PreambleTemplate.cshtml

@@ -1,15 +1,15 @@
 @using System
 @using System.Threading.Tasks
 @using Tyrrrz.Extensions
-@namespace DiscordChatExporter.Domain.Exporting.Writers.Html
-@inherits MiniRazor.TemplateBase<DiscordChatExporter.Domain.Exporting.Writers.Html.LayoutTemplateContext>
+@namespace DiscordChatExporter.Core.Exporting.Writers.Html
+@inherits MiniRazor.TemplateBase<DiscordChatExporter.Core.Exporting.Writers.Html.PreambleTemplateContext>
 
 @{
     string FormatDate(DateTimeOffset date) => Model.ExportContext.FormatDate(date);
 
     ValueTask<string> ResolveUrlAsync(string url) => Model.ExportContext.ResolveMediaUrlAsync(url);
 
-    string GetStyleSheet(string name) => Model.GetType().Assembly.GetManifestResourceString($"DiscordChatExporter.Domain.Exporting.Writers.Html.{name}.css");
+    string GetStyleSheet(string name) => Model.GetType().Assembly.GetManifestResourceString($"DiscordChatExporter.Core.Exporting.Writers.Html.{name}.css");
 }
 
 <!DOCTYPE html>
@@ -78,18 +78,18 @@
             <div class="preamble__entry preamble__entry--small">@Model.ExportContext.Request.Channel.Topic</div>
         }
 
-        @if (Model.ExportContext.Request.After != null || Model.ExportContext.Request.Before != null)
+        @if (Model.ExportContext.Request.After is not null || Model.ExportContext.Request.Before is not null)
         {
             <div class="preamble__entry preamble__entry--small">
-            @if (Model.ExportContext.Request.After != null && Model.ExportContext.Request.Before != null)
+            @if (Model.ExportContext.Request.After is not null && Model.ExportContext.Request.Before is not null)
             {
                 @($"Between {FormatDate(Model.ExportContext.Request.After.Value.ToDate())} and {FormatDate(Model.ExportContext.Request.Before.Value.ToDate())}")
             }
-            else if (Model.ExportContext.Request.After != null)
+            else if (Model.ExportContext.Request.After is not null)
             {
                 @($"After {FormatDate(Model.ExportContext.Request.After.Value.ToDate())}")
             }
-            else if (Model.ExportContext.Request.Before != null)
+            else if (Model.ExportContext.Request.Before is not null)
             {
                 @($"Before {FormatDate(Model.ExportContext.Request.Before.Value.ToDate())}")
             }

DiscordChatExporter.Core/Exporting/Writers/Html/PreambleTemplateContext.cs

@@ -0,0 +1,15 @@
+namespace DiscordChatExporter.Core.Exporting.Writers.Html
+{
+    internal class PreambleTemplateContext
+    {
+        public ExportContext ExportContext { get; }
+
+        public string ThemeName { get; }
+
+        public PreambleTemplateContext(ExportContext exportContext, string themeName)
+        {
+            ExportContext = exportContext;
+            ThemeName = themeName;
+        }
+    }
+}

DiscordChatExporter.Core/Exporting/Writers/HtmlMessageWriter.cs

@@ -2,10 +2,10 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting.Writers.Html;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Writers.Html;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal class HtmlMessageWriter : MessageWriter
     {
@@ -14,8 +14,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         private readonly List<Message> _messageGroupBuffer = new();
 
-        private long _messageCount;
-
         public HtmlMessageWriter(Stream stream, ExportContext context, string themeName)
             : base(stream, context)
         {
@@ -25,7 +23,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WritePreambleAsync()
         {
-            var templateContext = new LayoutTemplateContext(Context, _themeName, _messageCount);
+            var templateContext = new PreambleTemplateContext(Context, _themeName);
 
             await _writer.WriteLineAsync(
                 await PreambleTemplate.RenderAsync(templateContext)
@@ -43,6 +41,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WriteMessageAsync(Message message)
         {
+            await base.WriteMessageAsync(message);
+
             // If message group is empty or the given message can be grouped, buffer the given message
             if (!_messageGroupBuffer.Any() || MessageGroup.CanJoin(_messageGroupBuffer.Last(), message))
             {
@@ -56,9 +56,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
                 _messageGroupBuffer.Clear();
                 _messageGroupBuffer.Add(message);
             }
-
-            // Increment message count
-            _messageCount++;
         }
 
         public override async ValueTask WritePostambleAsync()
@@ -67,7 +64,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             if (_messageGroupBuffer.Any())
                 await WriteMessageGroupAsync(MessageGroup.Join(_messageGroupBuffer));
 
-            var templateContext = new LayoutTemplateContext(Context, _themeName, _messageCount);
+            var templateContext = new PostambleTemplateContext(Context, MessagesWritten);
 
             await _writer.WriteLineAsync(
                 await PostambleTemplate.RenderAsync(templateContext)

DiscordChatExporter.Core/Exporting/Writers/JsonMessageWriter.cs

@@ -1,27 +1,26 @@
 using System.IO;
+using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Threading.Tasks;
-using System.Text.Encodings.Web;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Writing;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal class JsonMessageWriter : MessageWriter
     {
         private readonly Utf8JsonWriter _writer;
 
-        private long _messageCount;
-
         public JsonMessageWriter(Stream stream, ExportContext context)
             : base(stream, context)
         {
             _writer = new Utf8JsonWriter(stream, new JsonWriterOptions
             {
                 Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
-                Indented = true
+                Indented = true,
+                SkipValidation = true
             });
         }
 
@@ -117,19 +116,19 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteString("timestamp", embed.Timestamp);
             _writer.WriteString("description", FormatMarkdown(embed.Description));
 
-            if (embed.Color != null)
+            if (embed.Color is not null)
                 _writer.WriteString("color", embed.Color.Value.ToHex());
 
-            if (embed.Author != null)
+            if (embed.Author is not null)
                 await WriteEmbedAuthorAsync(embed.Author);
 
-            if (embed.Thumbnail != null)
+            if (embed.Thumbnail is not null)
                 await WriteEmbedThumbnailAsync(embed.Thumbnail);
 
-            if (embed.Image != null)
+            if (embed.Image is not null)
                 await WriteEmbedImageAsync(embed.Image);
 
-            if (embed.Footer != null)
+            if (embed.Footer is not null)
                 await WriteEmbedFooterAsync(embed.Footer);
 
             // Fields
@@ -168,7 +167,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             _writer.WriteString("id", mentionedUser.Id.ToString());
             _writer.WriteString("name", mentionedUser.Name);
-            _writer.WriteNumber("discriminator", mentionedUser.Discriminator);
+            _writer.WriteString("discriminator", mentionedUser.DiscriminatorFormatted);
             _writer.WriteString("nickname", Context.TryGetMember(mentionedUser.Id)?.Nick ?? mentionedUser.Name);
             _writer.WriteBoolean("isBot", mentionedUser.IsBot);
 
@@ -192,7 +191,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteStartObject("channel");
             _writer.WriteString("id", Context.Request.Channel.Id.ToString());
             _writer.WriteString("type", Context.Request.Channel.Type.ToString());
-            _writer.WriteString("category", Context.Request.Channel.Category);
+            _writer.WriteString("categoryId", Context.Request.Channel.Category.Id.ToString());
+            _writer.WriteString("category", Context.Request.Channel.Category.Name);
             _writer.WriteString("name", Context.Request.Channel.Name);
             _writer.WriteString("topic", Context.Request.Channel.Topic);
             _writer.WriteEndObject();
@@ -210,6 +210,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WriteMessageAsync(Message message)
         {
+            await base.WriteMessageAsync(message);
+
             _writer.WriteStartObject();
 
             // Metadata
@@ -227,7 +229,9 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteStartObject("author");
             _writer.WriteString("id", message.Author.Id.ToString());
             _writer.WriteString("name", message.Author.Name);
-            _writer.WriteString("discriminator", $"{message.Author.Discriminator:0000}");
+            _writer.WriteString("discriminator", message.Author.DiscriminatorFormatted);
+            _writer.WriteString("nickname", Context.TryGetMember(message.Author.Id)?.Nick ?? message.Author.Name);
+            _writer.WriteString("color", Context.TryGetUserColor(message.Author.Id)?.ToHex());
             _writer.WriteBoolean("isBot", message.Author.IsBot);
             _writer.WriteString("avatarUrl", await Context.ResolveMediaUrlAsync(message.Author.AvatarUrl));
             _writer.WriteEndObject();
@@ -265,7 +269,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteEndArray();
 
             // Message reference
-            if (message.Reference != null)
+            if (message.Reference is not null)
             {
                 _writer.WriteStartObject("reference");
                 _writer.WriteString("messageId", message.Reference.MessageId?.ToString());
@@ -276,8 +280,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             _writer.WriteEndObject();
             await _writer.FlushAsync();
-
-            _messageCount++;
         }
 
         public override async ValueTask WritePostambleAsync()
@@ -285,7 +287,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             // Message array (end)
             _writer.WriteEndArray();
 
-            _writer.WriteNumber("messageCount", _messageCount);
+            _writer.WriteNumber("messageCount", MessagesWritten);
 
             // Root object (end)
             _writer.WriteEndObject();
@@ -298,4 +300,4 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             await base.DisposeAsync();
         }
     }
-}
+}

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

@@ -3,12 +3,13 @@ using System.Linq;
 using System.Net;
 using System.Text;
 using System.Text.RegularExpressions;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Markdown;
-using DiscordChatExporter.Domain.Markdown.Ast;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Markdown;
+using DiscordChatExporter.Core.Markdown.Ast;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
+namespace DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors
 {
     internal partial class HtmlMarkdownVisitor : MarkdownVisitor
     {
@@ -76,6 +77,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
 
         protected override MarkdownNode VisitMention(MentionNode mention)
         {
+            var mentionId = Snowflake.TryParse(mention.Id);
             if (mention.Type == MentionType.Meta)
             {
                 _buffer
@@ -85,7 +87,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.User)
             {
-                var member = _context.TryGetMember(Snowflake.Parse(mention.Id));
+                var member = mentionId?.Pipe(_context.TryGetMember);
                 var fullName = member?.User.FullName ?? "Unknown";
                 var nick = member?.Nick ?? "Unknown";
 
@@ -96,7 +98,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.Channel)
             {
-                var channel = _context.TryGetChannel(Snowflake.Parse(mention.Id));
+                var channel = mentionId?.Pipe(_context.TryGetChannel);
                 var name = channel?.Name ?? "deleted-channel";
 
                 _buffer
@@ -106,11 +108,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.Role)
             {
-                var role = _context.TryGetRole(Snowflake.Parse(mention.Id));
+                var role = mentionId?.Pipe(_context.TryGetRole);
                 var name = role?.Name ?? "deleted-role";
                 var color = role?.Color;
 
-                var style = color != null
+                var style = color is not null
                     ? $"color: rgb({color?.R}, {color?.G}, {color?.B}); background-color: rgba({color?.R}, {color?.G}, {color?.B}, 0.1);"
                     : "";
 

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

@@ -1,9 +1,10 @@
 using System.Text;
-using DiscordChatExporter.Domain.Discord;
-using DiscordChatExporter.Domain.Markdown;
-using DiscordChatExporter.Domain.Markdown.Ast;
+using DiscordChatExporter.Core.Discord;
+using DiscordChatExporter.Core.Markdown;
+using DiscordChatExporter.Core.Markdown.Ast;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
+namespace DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors
 {
     internal partial class PlainTextMarkdownVisitor : MarkdownVisitor
     {
@@ -24,27 +25,28 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
 
         protected override MarkdownNode VisitMention(MentionNode mention)
         {
+            var mentionId = Snowflake.TryParse(mention.Id);
             if (mention.Type == MentionType.Meta)
             {
                 _buffer.Append($"@{mention.Id}");
             }
             else if (mention.Type == MentionType.User)
             {
-                var member = _context.TryGetMember(Snowflake.Parse(mention.Id));
+                var member = mentionId?.Pipe(_context.TryGetMember);
                 var name = member?.User.Name ?? "Unknown";
 
                 _buffer.Append($"@{name}");
             }
             else if (mention.Type == MentionType.Channel)
             {
-                var channel = _context.TryGetChannel(Snowflake.Parse(mention.Id));
+                var channel = mentionId?.Pipe(_context.TryGetChannel);
                 var name = channel?.Name ?? "deleted-channel";
 
                 _buffer.Append($"#{name}");
             }
             else if (mention.Type == MentionType.Role)
             {
-                var role = _context.TryGetRole(Snowflake.Parse(mention.Id));
+                var role = mentionId?.Pipe(_context.TryGetRole);
                 var name = role?.Name ?? "deleted-role";
 
                 _buffer.Append($"@{name}");

DiscordChatExporter.Core/Exporting/Writers/MessageWriter.cs

@@ -1,9 +1,9 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal abstract class MessageWriter : IAsyncDisposable
     {
@@ -11,6 +11,10 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         protected ExportContext Context { get; }
 
+        public long MessagesWritten { get; private set; }
+
+        public long BytesWritten => Stream.Length;
+
         protected MessageWriter(Stream stream, ExportContext context)
         {
             Stream = stream;
@@ -19,7 +23,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public virtual ValueTask WritePreambleAsync() => default;
 
-        public abstract ValueTask WriteMessageAsync(Message message);
+        public virtual ValueTask WriteMessageAsync(Message message)
+        {
+            MessagesWritten++;
+            return default;
+        }
 
         public virtual ValueTask WritePostambleAsync() => default;
 

DiscordChatExporter.Core/Exporting/Writers/PlainTextMessageWriter.cs

@@ -2,18 +2,16 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal class PlainTextMessageWriter : MessageWriter
     {
         private readonly TextWriter _writer;
 
-        private long _messageCount;
-
         public PlainTextMessageWriter(Stream stream, ExportContext context)
             : base(stream, context)
         {
@@ -113,15 +111,15 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
         {
             await _writer.WriteLineAsync('='.Repeat(62));
             await _writer.WriteLineAsync($"Guild: {Context.Request.Guild.Name}");
-            await _writer.WriteLineAsync($"Channel: {Context.Request.Channel.Category} / {Context.Request.Channel.Name}");
+            await _writer.WriteLineAsync($"Channel: {Context.Request.Channel.Category.Name} / {Context.Request.Channel.Name}");
 
             if (!string.IsNullOrWhiteSpace(Context.Request.Channel.Topic))
                 await _writer.WriteLineAsync($"Topic: {Context.Request.Channel.Topic}");
 
-            if (Context.Request.After != null)
+            if (Context.Request.After is not null)
                 await _writer.WriteLineAsync($"After: {Context.FormatDate(Context.Request.After.Value.ToDate())}");
 
-            if (Context.Request.Before != null)
+            if (Context.Request.Before is not null)
                 await _writer.WriteLineAsync($"Before: {Context.FormatDate(Context.Request.Before.Value.ToDate())}");
 
             await _writer.WriteLineAsync('='.Repeat(62));
@@ -130,26 +128,29 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WriteMessageAsync(Message message)
         {
+            await base.WriteMessageAsync(message);
+
+            // Header
             await WriteMessageHeaderAsync(message);
 
+            // Content
             if (!string.IsNullOrWhiteSpace(message.Content))
                 await _writer.WriteLineAsync(FormatMarkdown(message.Content));
 
             await _writer.WriteLineAsync();
 
+            // Attachments, embeds, reactions
             await WriteAttachmentsAsync(message.Attachments);
             await WriteEmbedsAsync(message.Embeds);
             await WriteReactionsAsync(message.Reactions);
 
             await _writer.WriteLineAsync();
-
-            _messageCount++;
         }
 
         public override async ValueTask WritePostambleAsync()
         {
             await _writer.WriteLineAsync('='.Repeat(62));
-            await _writer.WriteLineAsync($"Exported {_messageCount:N0} message(s)");
+            await _writer.WriteLineAsync($"Exported {MessagesWritten:N0} message(s)");
             await _writer.WriteLineAsync('='.Repeat(62));
         }
 

DiscordChatExporter.Core/Markdown/Ast/EmojiNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal class EmojiNode : MarkdownNode
     {

DiscordChatExporter.Core/Markdown/Ast/FormattedNode.cs

@@ -1,6 +1,6 @@
 using System.Collections.Generic;
 
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal enum TextFormatting
     {

DiscordChatExporter.Core/Markdown/Ast/InlineCodeBlockNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal class InlineCodeBlockNode : MarkdownNode
     {

DiscordChatExporter.Core/Markdown/Ast/LinkNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal class LinkNode : MarkdownNode
     {

DiscordChatExporter.Core/Markdown/Ast/MarkdownNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal abstract class MarkdownNode
     {

DiscordChatExporter.Core/Markdown/Ast/MentionNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal enum MentionType
     {

DiscordChatExporter.Core/Markdown/Ast/MultiLineCodeBlockNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal class MultiLineCodeBlockNode : MarkdownNode
     {

DiscordChatExporter.Core/Markdown/Ast/TextNode.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Ast
+namespace DiscordChatExporter.Core.Markdown.Ast
 {
     internal class TextNode : MarkdownNode
     {

DiscordChatExporter.Core/Markdown/MarkdownParser.cs

@@ -1,10 +1,10 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
-using DiscordChatExporter.Domain.Markdown.Ast;
-using DiscordChatExporter.Domain.Markdown.Matching;
+using DiscordChatExporter.Core.Markdown.Ast;
+using DiscordChatExporter.Core.Markdown.Matching;
 
-namespace DiscordChatExporter.Domain.Markdown
+namespace DiscordChatExporter.Core.Markdown
 {
     // The following parsing logic is meant to replicate Discord's markdown grammar as close as possible
     internal static partial class MarkdownParser

DiscordChatExporter.Core/Markdown/MarkdownVisitor.cs

@@ -1,8 +1,8 @@
 using System;
 using System.Collections.Generic;
-using DiscordChatExporter.Domain.Markdown.Ast;
+using DiscordChatExporter.Core.Markdown.Ast;
 
-namespace DiscordChatExporter.Domain.Markdown
+namespace DiscordChatExporter.Core.Markdown
 {
     internal abstract class MarkdownVisitor
     {

DiscordChatExporter.Core/Markdown/Matching/AggregateMatcher.cs

@@ -1,6 +1,6 @@
 using System.Collections.Generic;
 
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal class AggregateMatcher<T> : IMatcher<T>
     {
@@ -27,11 +27,11 @@ namespace DiscordChatExporter.Domain.Markdown.Matching
                 var match = matcher.TryMatch(stringPart);
 
                 // If there's no match - continue
-                if (match == null)
+                if (match is null)
                     continue;
 
                 // If this match is earlier than previous earliest - replace
-                if (earliestMatch == null || match.StringPart.StartIndex < earliestMatch.StringPart.StartIndex)
+                if (earliestMatch is null || match.StringPart.StartIndex < earliestMatch.StringPart.StartIndex)
                     earliestMatch = match;
 
                 // If the earliest match starts at the very beginning - break,

DiscordChatExporter.Core/Markdown/Matching/IMatcher.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal interface IMatcher<T>
     {
@@ -21,7 +21,7 @@ namespace DiscordChatExporter.Domain.Markdown.Matching
                 var match = matcher.TryMatch(stringPart.Slice(currentIndex, stringPart.EndIndex - currentIndex));
 
                 // If there's no match - break
-                if (match == null)
+                if (match is null)
                     break;
 
                 // If this match doesn't start immediately at current index - transform and yield fallback first

DiscordChatExporter.Core/Markdown/Matching/ParsedMatch.cs

@@ -1,4 +1,4 @@
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal class ParsedMatch<T>
     {

DiscordChatExporter.Core/Markdown/Matching/RegexMatcher.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Text.RegularExpressions;
 
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal class RegexMatcher<T> : IMatcher<T>
     {

DiscordChatExporter.Core/Markdown/Matching/StringMatcher.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal class StringMatcher<T> : IMatcher<T>
     {

DiscordChatExporter.Core/Markdown/Matching/StringPart.cs

@@ -1,6 +1,6 @@
 using System.Text.RegularExpressions;
 
-namespace DiscordChatExporter.Domain.Markdown.Matching
+namespace DiscordChatExporter.Core.Markdown.Matching
 {
     internal readonly struct StringPart
     {

DiscordChatExporter.Core/Utils/Extensions/AsyncExtensions.cs

@@ -5,7 +5,7 @@ using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace DiscordChatExporter.Domain.Utilities
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
     public static class AsyncExtensions
     {

DiscordChatExporter.Core/Utils/Extensions/BinaryExtensions.cs

@@ -1,8 +1,8 @@
 using System.Text;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class BinaryExtensions
+    public static class BinaryExtensions
     {
         public static string ToHex(this byte[] data)
         {

DiscordChatExporter.Core/Utils/Extensions/ColorExtensions.cs

@@ -1,8 +1,8 @@
 using System.Drawing;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class ColorExtensions
+    public static class ColorExtensions
     {
         public static Color WithAlpha(this Color color, int alpha) => Color.FromArgb(alpha, color);
 

DiscordChatExporter.Core/Utils/Extensions/DateExtensions.cs

@@ -1,9 +1,9 @@
 using System;
 using System.Globalization;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class DateExtensions
+    public static class DateExtensions
     {
         public static string ToLocalString(this DateTimeOffset dateTime, string format) =>
             dateTime.ToLocalTime().ToString(format, CultureInfo.InvariantCulture);

DiscordChatExporter.Core/Utils/Extensions/GenericExtensions.cs

@@ -1,9 +1,11 @@
 using System;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class GenericExtensions
+    public static class GenericExtensions
     {
+        public static TOut Pipe<TIn, TOut>(this TIn input, Func<TIn, TOut> transform) => transform(input);
+
         public static T? NullIf<T>(this T value, Func<T, bool> predicate) where T : struct =>
             !predicate(value)
                 ? value

DiscordChatExporter.Core/Utils/Extensions/HttpExtensions.cs

@@ -1,8 +1,8 @@
 using System.Net.Http.Headers;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class HttpExtensions
+    public static class HttpExtensions
     {
         public static string? TryGetValue(this HttpContentHeaders headers, string name) =>
             headers.TryGetValues(name, out var values)

DiscordChatExporter.Core/Utils/Extensions/StringExtensions.cs

@@ -1,8 +1,8 @@
 using System.Text;
 
-namespace DiscordChatExporter.Domain.Internal.Extensions
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
-    internal static class StringExtensions
+    public static class StringExtensions
     {
         public static string Truncate(this string str, int charCount) =>
             str.Length > charCount

DiscordChatExporter.Core/Utils/Http.cs

@@ -7,9 +7,9 @@ using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Polly;
 
-namespace DiscordChatExporter.Domain.Internal
+namespace DiscordChatExporter.Core.Utils
 {
-    internal static class Http
+    public static class Http
     {
         public static HttpClient Client { get; } = new();
 
@@ -32,7 +32,7 @@ namespace DiscordChatExporter.Domain.Internal
                             if (i > 3)
                             {
                                 var retryAfterDelay = result.Result.Headers.RetryAfter.Delta;
-                                if (retryAfterDelay != null)
+                                if (retryAfterDelay is not null)
                                     return retryAfterDelay.Value + TimeSpan.FromSeconds(1); // margin just in case
                             }
                         }