Update version

Fixes #551

.gitattributes

@@ -1,63 +0,0 @@
-###############################################################################
-# Set default behavior to automatically normalize line endings.
-###############################################################################
-* text=auto
-
-###############################################################################
-# Set default behavior for command prompt diff.
-#
-# This is need for earlier builds of msysgit that does not have it on by
-# default for csharp files.
-# Note: This is only used by command line
-###############################################################################
-#*.cs     diff=csharp
-
-###############################################################################
-# Set the merge driver for project and solution files
-#
-# Merging from the command prompt will add diff markers to the files if there
-# are conflicts (Merging from VS is not affected by the settings below, in VS
-# the diff markers are never inserted). Diff markers may cause the following 
-# file extensions to fail to load in VS. An alternative would be to treat
-# these files as binary and thus will always conflict and require user
-# intervention with every merge. To do so, just uncomment the entries below
-###############################################################################
-#*.sln       merge=binary
-#*.csproj    merge=binary
-#*.vbproj    merge=binary
-#*.vcxproj   merge=binary
-#*.vcproj    merge=binary
-#*.dbproj    merge=binary
-#*.fsproj    merge=binary
-#*.lsproj    merge=binary
-#*.wixproj   merge=binary
-#*.modelproj merge=binary
-#*.sqlproj   merge=binary
-#*.wwaproj   merge=binary
-
-###############################################################################
-# behavior for image files
-#
-# image files are treated as binary by default.
-###############################################################################
-#*.jpg   binary
-#*.png   binary
-#*.gif   binary
-
-###############################################################################
-# diff behavior for common document formats
-# 
-# Convert binary document formats to text before diffing them. This feature
-# is only available from the command line. Turn it on by uncommenting the 
-# entries below.
-###############################################################################
-#*.doc   diff=astextplain
-#*.DOC   diff=astextplain
-#*.docx  diff=astextplain
-#*.DOCX  diff=astextplain
-#*.dot   diff=astextplain
-#*.DOT   diff=astextplain
-#*.pdf   diff=astextplain
-#*.PDF   diff=astextplain
-#*.rtf   diff=astextplain
-#*.RTF   diff=astextplain

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,55 @@
+name: "\U0001F41E Bug report"
+description: Report broken functionality.
+labels: [bug]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Important:
+
+      - 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, please 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: dropdown
+  attributes:
+    label: Export format
+    description: "Which export format(s) does this bug affect? If this bug is not related to any specific export format, leave this blank."
+    multiple: true
+    options:
+    - HTML
+    - TXT
+    - JSON
+    - CSV
+
+- 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 +1,39 @@
+name: "\U00002728 Feature request"
+description: Request a new feature.
+labels: [enhancement]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Important:
+
+      - 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, please 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? If this feature is not related to any specific flavor, leave this blank."
+    multiple: true
+    options:
+    - GUI (Graphical User Interface)
+    - CLI (Command Line Interface)
+
+- type: dropdown
+  attributes:
+    label: Export format
+    description: "Which export format(s) does this feature request apply to? If this feature is not related to any specific export format, leave this blank."
+    multiple: true
+    options:
+    - HTML
+    - TXT
+    - JSON
+    - CSV
+
+- type: textarea
+  attributes:
+    label: Details
+    description: "Clear and thorough explanation of the feature you have in mind. If relevant, include screenshots or screen recordings."
+  validations:
+    required: true

.github/workflows/CD.yml

@@ -3,64 +3,69 @@ name: CD
 on:
   push:
     tags:
-    - '*'
+      - "*"
 
 jobs:
   build:
     runs-on: windows-latest
 
     steps:
-    - name: Checkout
+      - name: Checkout
-      uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.3
 
-    - name: Install .NET Core
+      - name: Install .NET (v3.1)
-      uses: actions/setup-dotnet@v1.4.0
+        uses: actions/setup-dotnet@v1.7.2
-      with:
+        with:
-        dotnet-version: 3.1.100
+          dotnet-version: 3.1.x
 
-    - name: Build & publish (CLI)
+      - name: Install .NET (v5.0)
-      run: dotnet publish DiscordChatExporter.Cli/ -o DiscordChatExporter.Cli/bin/Publish/ --configuration Release
+        uses: actions/setup-dotnet@v1.7.2
+        with:
+          dotnet-version: 5.0.x
 
-    - name: Build & publish (GUI)
+      - name: Build & publish (CLI)
-      run: dotnet publish DiscordChatExporter.Gui/ -o DiscordChatExporter.Gui/bin/Publish/ --configuration Release
+        run: dotnet publish DiscordChatExporter.Cli/ -o DiscordChatExporter.Cli/bin/Publish/ --configuration Release
 
-    - name: Pack (CLI)
+      - name: Build & publish (GUI)
-      run: Compress-Archive -Path DiscordChatExporter.Cli/bin/Publish/* -DestinationPath DiscordChatExporter.Cli/bin/Publish/Archive.zip -Force
+        run: dotnet publish DiscordChatExporter.Gui/ -o DiscordChatExporter.Gui/bin/Publish/ --configuration Release
-      shell: pwsh
 
-    - name: Pack (GUI)
+      - name: Pack (CLI)
-      run: Compress-Archive -Path DiscordChatExporter.Gui/bin/Publish/* -DestinationPath DiscordChatExporter.Gui/bin/Publish/Archive.zip -Force
+        run: Compress-Archive -Path DiscordChatExporter.Cli/bin/Publish/* -DestinationPath DiscordChatExporter.Cli/bin/Publish/Archive.zip -Force
-      shell: pwsh
+        shell: pwsh
 
-    - name: Create release
+      - name: Pack (GUI)
-      id: create_release
+        run: Compress-Archive -Path DiscordChatExporter.Gui/bin/Publish/* -DestinationPath DiscordChatExporter.Gui/bin/Publish/Archive.zip -Force
-      uses: actions/create-release@v1.0.1
+        shell: pwsh
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
-        tag_name: ${{ github.ref }}
-        release_name: ${{ github.ref }}
-        body: |
-          [Changelog](https://github.com/Tyrrrz/DiscordChatExporter/blob/master/Changelog.md)
-        draft: false
-        prerelease: false
 
-    - name: Upload release asset (CLI)
+      - name: Create release
-      uses: actions/upload-release-asset@v1.0.2
+        id: create_release
-      env:
+        uses: actions/create-release@v1.0.1
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        env:
-      with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        upload_url: ${{ steps.create_release.outputs.upload_url }}
+        with:
-        asset_path: DiscordChatExporter.Cli/bin/Publish/Archive.zip
+          tag_name: ${{ github.ref }}
-        asset_name: DiscordChatExporter.CLI.zip
+          release_name: ${{ github.ref }}
-        asset_content_type: application/zip
+          body: |
+            [Changelog](https://github.com/Tyrrrz/DiscordChatExporter/blob/master/Changelog.md)
+          draft: false
+          prerelease: false
 
-    - name: Upload release asset (GUI)
+      - name: Upload release asset (CLI)
-      uses: actions/upload-release-asset@v1.0.2
+        uses: actions/upload-release-asset@v1.0.2
-      env:
+        env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      with:
+        with:
-        upload_url: ${{ steps.create_release.outputs.upload_url }}
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
-        asset_path: DiscordChatExporter.Gui/bin/Publish/Archive.zip
+          asset_path: DiscordChatExporter.Cli/bin/Publish/Archive.zip
-        asset_name: DiscordChatExporter.zip
+          asset_name: DiscordChatExporter.CLI.zip
-        asset_content_type: application/zip
+          asset_content_type: application/zip
+
+      - name: Upload release asset (GUI)
+        uses: actions/upload-release-asset@v1.0.2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: DiscordChatExporter.Gui/bin/Publish/Archive.zip
+          asset_name: DiscordChatExporter.zip
+          asset_content_type: application/zip

.github/workflows/CI.yml

@@ -7,28 +7,33 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - name: Checkout
+      - name: Checkout
-      uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.3
 
-    - name: Install .NET Core
+      - name: Install .NET (v3.1)
-      uses: actions/setup-dotnet@v1.4.0
+        uses: actions/setup-dotnet@v1.7.2
-      with:
+        with:
-        dotnet-version: 3.1.100
+          dotnet-version: 3.1.x
 
-    - name: Build & publish (CLI)
+      - name: Install .NET (v5.0)
-      run: dotnet publish DiscordChatExporter.Cli/ -o DiscordChatExporter.Cli/bin/Publish/ --configuration Release
+        uses: actions/setup-dotnet@v1.7.2
+        with:
+          dotnet-version: 5.0.x
 
-    - name: Build & publish (GUI)
+      - name: Build & publish (CLI)
-      run: dotnet publish DiscordChatExporter.Gui/ -o DiscordChatExporter.Gui/bin/Publish/ --configuration Release
+        run: dotnet publish DiscordChatExporter.Cli/ -o DiscordChatExporter.Cli/bin/Publish/ --configuration Release
 
-    - name: Upload build artifacts (CLI)
+      - name: Build & publish (GUI)
-      uses: actions/upload-artifact@v1
+        run: dotnet publish DiscordChatExporter.Gui/ -o DiscordChatExporter.Gui/bin/Publish/ --configuration Release
-      with:
-        name: DiscordChatExporter.CLI
-        path: DiscordChatExporter.Cli/bin/Publish/
 
-    - name: Upload build artifact (GUI)
+      - name: Upload build artifacts (CLI)
-      uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v1
-      with:
+        with:
-        name: DiscordChatExporter
+          name: DiscordChatExporter.CLI
-        path: DiscordChatExporter.Gui/bin/Publish/
+          path: DiscordChatExporter.Cli/bin/Publish/
+
+      - name: Upload build artifact (GUI)
+        uses: actions/upload-artifact@v1
+        with:
+          name: DiscordChatExporter
+          path: DiscordChatExporter.Gui/bin/Publish/

.gitignore

@@ -1,261 +1,22 @@
-## Ignore Visual Studio temporary files, build results, and
-## files generated by popular Visual Studio add-ons.
-
 # User-specific files
 *.suo
 *.user
 *.userosscache
 *.sln.docstates
-
+.idea/
-# User-specific files (MonoDevelop/Xamarin Studio)
+.vs/
-*.userprefs
 
 # Build results
 [Dd]ebug/
 [Dd]ebugPublic/
 [Rr]elease/
 [Rr]eleases/
-x64/
+[Xx]64/
-x86/
+[Xx]86/
+[Bb]uild/
 bld/
 [Bb]in/
 [Oo]bj/
-[Ll]og/
 
-# Visual Studio 2015 cache/options directory
+# Coverage
-.vs/
+*.opencover.xml
-# Uncomment if you have tasks that create the project's static files in wwwroot
-#wwwroot/
-
-# MSTest test Results
-[Tt]est[Rr]esult*/
-[Bb]uild[Ll]og.*
-
-# NUNIT
-*.VisualState.xml
-TestResult.xml
-
-# Build Results of an ATL Project
-[Dd]ebugPS/
-[Rr]eleasePS/
-dlldata.c
-
-# DNX
-project.lock.json
-project.fragment.lock.json
-artifacts/
-
-*_i.c
-*_p.c
-*_i.h
-*.ilk
-*.meta
-*.obj
-*.pch
-*.pdb
-*.pgc
-*.pgd
-*.rsp
-*.sbr
-*.tlb
-*.tli
-*.tlh
-*.tmp
-*.tmp_proj
-*.log
-*.vspscc
-*.vssscc
-.builds
-*.pidb
-*.svclog
-*.scc
-
-# Chutzpah Test files
-_Chutzpah*
-
-# Visual C++ cache files
-ipch/
-*.aps
-*.ncb
-*.opendb
-*.opensdf
-*.sdf
-*.cachefile
-*.VC.db
-*.VC.VC.opendb
-
-# Visual Studio profiler
-*.psess
-*.vsp
-*.vspx
-*.sap
-
-# TFS 2012 Local Workspace
-$tf/
-
-# Guidance Automation Toolkit
-*.gpState
-
-# ReSharper is a .NET coding add-in
-_ReSharper*/
-*.[Rr]e[Ss]harper
-*.DotSettings.user
-
-# JustCode is a .NET coding add-in
-.JustCode
-
-# TeamCity is a build add-in
-_TeamCity*
-
-# DotCover is a Code Coverage Tool
-*.dotCover
-
-# NCrunch
-_NCrunch_*
-.*crunch*.local.xml
-nCrunchTemp_*
-
-# MightyMoose
-*.mm.*
-AutoTest.Net/
-
-# Web workbench (sass)
-.sass-cache/
-
-# Installshield output folder
-[Ee]xpress/
-
-# DocProject is a documentation generator add-in
-DocProject/buildhelp/
-DocProject/Help/*.HxT
-DocProject/Help/*.HxC
-DocProject/Help/*.hhc
-DocProject/Help/*.hhk
-DocProject/Help/*.hhp
-DocProject/Help/Html2
-DocProject/Help/html
-
-# Click-Once directory
-publish/
-
-# Publish Web Output
-*.[Pp]ublish.xml
-*.azurePubxml
-# TODO: Comment the next line if you want to checkin your web deploy settings
-# but database connection strings (with potential passwords) will be unencrypted
-#*.pubxml
-*.publishproj
-
-# Microsoft Azure Web App publish settings. Comment the next line if you want to
-# checkin your Azure Web App publish settings, but sensitive information contained
-# in these scripts will be unencrypted
-PublishScripts/
-
-# NuGet Packages
-*.nupkg
-# The packages folder can be ignored because of Package Restore
-**/packages/*
-# except build/, which is used as an MSBuild target.
-!**/packages/build/
-# Uncomment if necessary however generally it will be regenerated when needed
-#!**/packages/repositories.config
-# NuGet v3's project.json files produces more ignoreable files
-*.nuget.props
-*.nuget.targets
-
-# Microsoft Azure Build Output
-csx/
-*.build.csdef
-
-# Microsoft Azure Emulator
-ecf/
-rcf/
-
-# Windows Store app package directories and files
-AppPackages/
-BundleArtifacts/
-Package.StoreAssociation.xml
-_pkginfo.txt
-
-# Visual Studio cache files
-# files ending in .cache can be ignored
-*.[Cc]ache
-# but keep track of directories ending in .cache
-!*.[Cc]ache/
-
-# Others
-ClientBin/
-~$*
-*~
-*.dbmdl
-*.dbproj.schemaview
-*.jfm
-*.pfx
-*.publishsettings
-node_modules/
-orleans.codegen.cs
-
-# Since there are multiple workflows, uncomment next line to ignore bower_components
-# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
-#bower_components/
-
-# RIA/Silverlight projects
-Generated_Code/
-
-# Backup & report files from converting an old project file
-# to a newer Visual Studio version. Backup files are not needed,
-# because we have git ;-)
-_UpgradeReport_Files/
-Backup*/
-UpgradeLog*.XML
-UpgradeLog*.htm
-
-# SQL Server files
-*.mdf
-*.ldf
-
-# Business Intelligence projects
-*.rdl.data
-*.bim.layout
-*.bim_*.settings
-
-# Microsoft Fakes
-FakesAssemblies/
-
-# GhostDoc plugin setting file
-*.GhostDoc.xml
-
-# Node.js Tools for Visual Studio
-.ntvs_analysis.dat
-
-# Visual Studio 6 build log
-*.plg
-
-# Visual Studio 6 workspace options file
-*.opt
-
-# Visual Studio LightSwitch build output
-**/*.HTMLClient/GeneratedArtifacts
-**/*.DesktopClient/GeneratedArtifacts
-**/*.DesktopClient/ModelManifest.xml
-**/*.Server/GeneratedArtifacts
-**/*.Server/ModelManifest.xml
-_Pvt_Extensions
-
-# Paket dependency manager
-.paket/paket.exe
-paket-files/
-
-# FAKE - F# Make
-.fake/
-
-# JetBrains Rider
-.idea/
-*.sln.iml
-
-# CodeRush
-.cr/
-
-# Python Tools for Visual Studio (PTVS)
-__pycache__/
-*.pyc

Changelog.md

@@ -1,3 +1,67 @@
+### v2.27.1 (08-Jun-2021)
+
+- [GUI] Application will now detect if the required .NET Runtime or any of its prerequisites are missing and prompt the user to download and install them automatically. **Experimental feature, please test it out and report any issues you may find!**
+- [CLI] Fixed an issue where the application crashed when exporting a channel that had square brackets as part of its name or category name. (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+
+### 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))
+- [HTML] Improved styling of non-media attachments (regular files, i.e. not video, audio, or image). (Thanks [@Lucas LaBuff](https://github.com/96-LB))
+- [HTML] Improved initial export performance.
+- [JSON] Relaxed escaping rules for unicode characters. (Thanks [@Sanqui](https://github.com/Sanqui))
+- [JSON] Added support for replies. (Thanks [@Sanqui](https://github.com/Sanqui))
+- [CLI] Added channel names to errors shown on failures when exporting multiple channels. (Thanks [@Sanqui](https://github.com/Sanqui))
+- [CLI] Added support for passing message IDs (snowflakes) to `--after` and `--before` options. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Files downloaded by the "download referenced media" option now have their dates set according to the `Last-Modified` header provided by Discord CDN. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Fixed an issue where the application sometimes crashed with `NullReferenceException` when retrying a failed HTTP request.
+- Migrated to Discord API v8.
+
+### v2.25 (23-Nov-2020)
+
+- [JSON] Added `mentions` property to the output. This contains users referenced inside the message text, but doesn't include mentions in embeds. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- [HTML] Added better previews for attached video and audio. They are now rendered using a browser native player element. The actual file path can still be retrieved by right clicking and selecting "Copy file path". (Thanks [@sas41](https://github.com/sas41))
+- [CLI] Fixed an issue where using `--media` option without providing a rooted path via `--output` option triggered an error.
+- [CLI] Fixed an issue where using `--reuse-media` option without also providing `--media` option was accepted, but didn't actually do anything. Now this produces an error instead. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+
+### v2.24 (24-Oct-2020)
+
+- [CLI] Updated to [CliFx v1.5](https://github.com/Tyrrrz/CliFx), which brings some UX improvements.
+- [GUI] Added dark mode, which can be enabled in settings. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- [GUI] Improved the UX in a few minor places.
+- [JSON] Added `embed.color` property to the output. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added additional date formats: `unix` to write dates as a unix timestamp and `unixms` for the milliseconds version. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added retry policy for downloading media content. This is mostly a workaround for transient failures that sometimes may occur when downloading assets referenced from embeds. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+- Added an option to reuse already downloaded media to avoid redundant network requests. It can be enabled in settings in GUI, or by passing `--reuse-media` in CLI. To facilitate this feature, the file name strategy has been changed as well -- now instead of relying on the original file name and adding `(n)` to the end in case of duplicates, a URL hash is injected in every file name. This also means that when the "reuse media" option is disabled, existing files inside the media directory may be overwritten. (Thanks [@Andrew Kolos](https://github.com/andrewkolos))
+
+### v2.23 (14-Sep-2020)
+
+- [CLI] Added a command to export all channels across all servers. Use `exportall` to do it. (Thanks [@wyattscarpenter](https://github.com/wyattscarpenter))
+- [HTML] Fixed an issue where Whitney fonts were not being loaded properly, causing the browser to fall back to Helvetica.
+- Fixed an issue where self-contained export crashed occasionally. This usually happened when the server hosting the file did not serve the stream properly. Such files are now ignored after the first failed attempt.
+
+### v2.22 (12-Aug-2020)
+
+- [GUI] Improved the channel list by adding collapsible category groups. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [GUI] Improved exporting options by adding a set of controls that can be used to limit the date range of the export down to minutes. Previously it was only possible to configure the date range without the time component. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [HTML] Fixed an issue where the export didn't reflect changes in nicknames between messages sent by bots. This affected chat logs that contained interactions with the Tupperbox bot. (Thanks [@CarJem Generations](https://github.com/CarJem))
+- [CLI] Fixed an issue where the application crashed if there were two environment variables defined that had the same name but in different case.
+
 ### v2.21.2 (30-Jul-2020)
 
 - [GUI] When copy-pasting token, any surrounding spaces are now discarded, in addition to double quotes.

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

@@ -2,11 +2,12 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp3.1</TargetFramework>
-    <Version>2.21.2</Version>
+    <Version>2.27.1</Version>
     <Company>Tyrrrz</Company>
     <Copyright>Copyright (c) Alexey Golub</Copyright>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
+    <WarningsAsErrors>nullable</WarningsAsErrors>
   </PropertyGroup>
 
 </Project>

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -1,72 +1,145 @@
 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.Utilities;
+using CliFx.Exceptions;
-using DiscordChatExporter.Domain.Discord.Models;
+using CliFx.Infrastructure;
-using DiscordChatExporter.Domain.Exporting;
+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
 {
     public abstract class ExportCommandBase : TokenCommandBase
     {
         [CommandOption("output", 'o', Description = "Output file or directory path.")]
-        public string OutputPath { get; set; } = Directory.GetCurrentDirectory();
+        public string OutputPath { get; init; } = Directory.GetCurrentDirectory();
 
-        [CommandOption("format", 'f', Description = "Output file format.")]
+        [CommandOption("format", 'f', Description = "Export format.")]
-        public ExportFormat ExportFormat { get; set; } = ExportFormat.HtmlDark;
+        public ExportFormat ExportFormat { get; init; } = ExportFormat.HtmlDark;
 
-        [CommandOption("after", Description = "Limit to messages sent after this date.")]
+        [CommandOption("after", Description = "Only include messages sent after this date or message ID.")]
-        public DateTimeOffset? After { get; set; }
+        public Snowflake? After { get; init; }
 
-        [CommandOption("before", Description = "Limit to messages sent before this date.")]
+        [CommandOption("before", Description = "Only include messages sent before this date or message ID.")]
-        public DateTimeOffset? Before { get; set; }
+        public Snowflake? Before { get; init; }
 
-        [CommandOption("partition", 'p', Description = "Split output into partitions limited to this number of messages.")]
+        [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 int? PartitionLimit { get; set; }
+        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; set; }
+        public bool ShouldDownloadMedia { get; init; }
 
-        [CommandOption("dateformat", Description = "Date format used in output.")]
+        [CommandOption("reuse-media", Description = "Reuse already existing media content to skip redundant downloads.")]
-        public string DateFormat { get; set; } = "dd-MMM-yy hh:mm tt";
+        public bool ShouldReuseMedia { get; init; }
 
-        protected ChannelExporter GetChannelExporter() => new ChannelExporter(GetDiscordClient());
+        [CommandOption("dateformat", Description = "Format used when writing dates.")]
+        public string DateFormat { get; init; } = "dd-MMM-yy hh:mm tt";
 
-        protected async ValueTask ExportAsync(IConsole console, Guild guild, Channel channel)
+        private ChannelExporter? _channelExporter;
+        protected ChannelExporter Exporter => _channelExporter ??= new ChannelExporter(Discord);
+
+        protected async ValueTask ExportAsync(IConsole console, IReadOnlyList<Channel> channels)
         {
-            console.Output.Write($"Exporting channel '{channel.Category} / {channel.Name}'... ");
+            await console.Output.WriteLineAsync($"Exporting {channels.Count} channel(s)...");
-            var progress = console.CreateProgressTicker();
 
-            var request = new ExportRequest(
+            var errors = new ConcurrentDictionary<Channel, string>();
-                guild,
-                channel,
-                OutputPath,
-                ExportFormat,
-                After,
-                Before,
-                PartitionLimit,
-                ShouldDownloadMedia,
-                DateFormat
-            );
 
-            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();
+                            var request = new ExportRequest(
-            console.Output.WriteLine("Done.");
+                                guild,
+                                channel,
+                                OutputPath,
+                                ExportFormat,
+                                After,
+                                Before,
+                                PartitionLimit,
+                                ShouldDownloadMedia,
+                                ShouldReuseMedia,
+                                DateFormat
+                            );
+
+                            await Exporter.ExportChannelAsync(request, progress);
+                        });
+                    }
+                    catch (DiscordChatExporterException ex) when (!ex.IsCritical)
+                    {
+                        errors[channel] = ex.Message;
+                    }
+                }, ParallelLimit.ClampMin(1));
+            });
+
+            // 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.");
         }
 
-        protected async ValueTask ExportAsync(IConsole console, Channel channel)
+        public override ValueTask ExecuteAsync(IConsole console)
         {
-            var guild = await GetDiscordClient().GetGuildAsync(channel.GuildId);
+            if (ShouldReuseMedia && !ShouldDownloadMedia)
-            await ExportAsync(console, guild, channel);
+            {
-        }
+                throw new CommandException("Option --reuse-media cannot be used without --media.");
+            }
 
-        protected async ValueTask ExportAsync(IConsole console, string channelId)
+            return default;
-        {
-            var channel = await GetDiscordClient().GetChannelAsync(channelId);
-            await ExportAsync(console, channel);
         }
     }
 }

DiscordChatExporter.Cli/Commands/Base/ExportMultipleCommandBase.cs

@@ -1,76 +0,0 @@
-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 = "Export this number of channels in parallel.")]
-        public int ParallelLimit { get; set; } = 1;
-
-        protected async ValueTask ExportMultipleAsync(IConsole console, IReadOnlyList<Channel> channels)
-        {
-            // HACK: this uses a separate route from ExportCommandBase because the progress ticker is not thread-safe
-
-            console.Output.Write($"Exporting {channels.Count} channels... ");
-            var progress = console.CreateProgressTicker();
-
-            var operations = progress.Wrap().CreateOperations(channels.Count);
-
-            var errors = new List<string>();
-
-            var successfulExportCount = 0;
-            await channels.Zip(operations).ParallelForEachAsync(async tuple =>
-            {
-                var (channel, operation) = tuple;
-
-                try
-                {
-                    var guild = await GetDiscordClient().GetGuildAsync(channel.GuildId);
-
-                    var request = new ExportRequest(
-                        guild,
-                        channel,
-                        OutputPath,
-                        ExportFormat,
-                        After,
-                        Before,
-                        PartitionLimit,
-                        ShouldDownloadMedia,
-                        DateFormat
-                    );
-
-                    await GetChannelExporter().ExportChannelAsync(request, operation);
-
-                    Interlocked.Increment(ref successfulExportCount);
-                }
-                catch (DiscordChatExporterException ex) when (!ex.IsCritical)
-                {
-                    errors.Add(ex.Message);
-                }
-                finally
-                {
-                    operation.Dispose();
-                }
-            }, ParallelLimit.ClampMin(1));
-
-            console.Output.WriteLine();
-
-            foreach (var error in errors)
-                console.Error.WriteLine(error);
-
-            console.Output.WriteLine($"Successfully exported {successfulExportCount} channel(s).");
-        }
-    }
-}

DiscordChatExporter.Cli/Commands/Base/TokenCommandBase.cs

@@ -1,23 +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",
+        [CommandOption("token", 't', IsRequired = true, EnvironmentVariable = "DISCORD_TOKEN", Description = "Authentication token.")]
-            Description = "Authorization token.")]
+        public string TokenValue { get; init; } = "";
-        public string TokenValue { get; set; } = "";
 
-        [CommandOption("bot", 'b', EnvironmentVariableName = "DISCORD_TOKEN_BOT",
+        [CommandOption("bot", 'b', EnvironmentVariable = "DISCORD_TOKEN_BOT", Description = "Authenticate as a bot.")]
-            Description = "Whether this authorization token belongs to a bot.")]
+        public bool IsBotToken { get; init; }
-        public bool IsBotToken { get; set; }
 
-        protected AuthToken GetAuthToken() => new AuthToken(IsBotToken ? AuthTokenType.Bot : AuthTokenType.User, TokenValue);
+        private AuthToken GetAuthToken() => new(
+            IsBotToken
+                ? AuthTokenType.Bot
+                : AuthTokenType.User,
+            TokenValue
+        );
 
-        protected DiscordClient GetDiscordClient() => new DiscordClient(GetAuthToken());
+        private DiscordClient? _discordClient;
+        protected DiscordClient Discord => _discordClient ??= new DiscordClient(GetAuthToken());
 
         public abstract ValueTask ExecuteAsync(IConsole console);
     }

DiscordChatExporter.Cli/Commands/ExportAllCommand.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using CliFx.Attributes;
+using CliFx.Infrastructure;
+using DiscordChatExporter.Cli.Commands.Base;
+using DiscordChatExporter.Core.Discord.Data;
+
+namespace DiscordChatExporter.Cli.Commands
+{
+    [Command("exportall", Description = "Export all accessible channels.")]
+    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 Discord.GetUserGuildsAsync())
+            {
+                // Skip DMs if instructed to
+                if (!IncludeDirectMessages && guild.Id == Guild.DirectMessages.Id)
+                    continue;
+
+                await foreach (var channel in Discord.GetGuildChannelsAsync(guild.Id))
+                {
+                    channels.Add(channel);
+                }
+            }
+
+            // Export
+            await ExportAsync(console, channels);
+        }
+    }
+}

DiscordChatExporter.Cli/Commands/ExportChannelCommand.cs

@@ -1,16 +0,0 @@
-using System.Threading.Tasks;
-using CliFx;
-using CliFx.Attributes;
-using DiscordChatExporter.Cli.Commands.Base;
-
-namespace DiscordChatExporter.Cli.Commands
-{
-    [Command("export", Description = "Export a channel.")]
-    public class ExportChannelCommand : ExportCommandBase
-    {
-        [CommandOption("channel", 'c', IsRequired = true, Description = "Channel ID.")]
-        public string ChannelId { get; set; } = "";
-
-        public override async ValueTask ExecuteAsync(IConsole 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.Core.Discord.Data;
-using DiscordChatExporter.Domain.Utilities;
+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 dmChannels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
+            await base.ExecuteAsync(console);
-            await ExportMultipleAsync(console, dmChannels);
+
+            // 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

@@ -1,21 +1,28 @@
 using System.Threading.Tasks;
-using CliFx;
 using CliFx.Attributes;
+using CliFx.Infrastructure;
 using DiscordChatExporter.Cli.Commands.Base;
-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 string GuildId { get; set; } = "";
+        public Snowflake GuildId { get; init; }
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var guildChannels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
+            await base.ExecuteAsync(console);
-            await ExportMultipleAsync(console, guildChannels);
+
+            // 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

@@ -1,24 +1,39 @@
-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.Discord;
+using DiscordChatExporter.Core.Utils.Extensions;
 
 namespace DiscordChatExporter.Cli.Commands
 {
-    [Command("channels", Description = "Get the list of channels in specified guild.")]
+    [Command("channels", Description = "Get the list of channels in a guild.")]
     public class GetChannelsCommand : TokenCommandBase
     {
         [CommandOption("guild", 'g', IsRequired = true, Description = "Guild ID.")]
-        public string GuildId { get; set; } = "";
+        public Snowflake GuildId { get; init; }
 
         public override async ValueTask ExecuteAsync(IConsole console)
         {
-            var guildChannels = await GetDiscordClient().GetGuildChannelsAsync(GuildId);
+            var channels = await Discord.GetGuildChannelsAsync(GuildId);
 
-            foreach (var channel in guildChannels.OrderBy(c => c.Category).ThenBy(c => c.Name))
+            foreach (var channel in channels.OrderBy(c => c.Category.Position).ThenBy(c => c.Name))
-                console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
+            {
+                // Channel ID
+                await console.Output.WriteAsync(channel.Id.ToString());
+
+                // Separator
+                using (console.WithForegroundColor(ConsoleColor.DarkGray))
+                    await console.Output.WriteAsync(" | ");
+
+                // Channel category / name
+                using (console.WithForegroundColor(ConsoleColor.White))
+                    await console.Output.WriteAsync($"{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.Core.Discord.Data;
-using DiscordChatExporter.Domain.Utilities;
+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 dmChannels = await GetDiscordClient().GetGuildChannelsAsync(Guild.DirectMessages.Id);
+            var channels = await Discord.GetGuildChannelsAsync(Guild.DirectMessages.Id);
 
-            foreach (var channel in dmChannels.OrderBy(c => c.Category).ThenBy(c => c.Name))
+            foreach (var channel in channels.OrderBy(c => c.Name))
-                console.Output.WriteLine($"{channel.Id} | {channel.Category} / {channel.Name}");
+            {
+                // Channel ID
+                await console.Output.WriteAsync(channel.Id.ToString());
+
+                // Separator
+                using (console.WithForegroundColor(ConsoleColor.DarkGray))
+                    await console.Output.WriteAsync(" | ");
+
+                // Channel category / name
+                using (console.WithForegroundColor(ConsoleColor.White))
+                    await console.Output.WriteAsync($"{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
 {
@@ -10,7 +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");
@@ -20,14 +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");
@@ -35,7 +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");
@@ -44,8 +53,11 @@ namespace DiscordChatExporter.Cli.Commands
             console.Output.WriteLine(" 6. Copy the first long sequence of numbers inside the URL");
             console.Output.WriteLine();
 
-            console.Output.WriteLine("For more information, check out the wiki:");
+            using (console.WithForegroundColor(ConsoleColor.White))
-            console.Output.WriteLine("https://github.com/Tyrrrz/DiscordChatExporter/wiki");
+                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

@@ -1,5 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <Import Project="../DiscordChatExporter.props" />
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
@@ -7,13 +6,14 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="CliFx" Version="1.3.1" />
+    <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 +1,52 @@
+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(
+                // Don't recognize random square brackets as style tags
+                Markup.Escape(description),
+                new ProgressTaskSettings {MaxValue = 1}
+            );
+
+            try
+            {
+                await performOperationAsync(progressTask);
+            }
+            finally
+            {
+                progressTask.StopTask();
+            }
+        }
+    }
+}

DiscordChatExporter.Cli/Utils/Pollyfills.cs

@@ -0,0 +1,9 @@
+// ReSharper disable CheckNamespace
+// TODO: remove after moving to .NET 5
+
+namespace System.Runtime.CompilerServices
+{
+    internal static class IsExternalInit
+    {
+    }
+}

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

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+using DiscordChatExporter.Core.Discord.Data.Common;
+using DiscordChatExporter.Core.Utils.Extensions;
+using JsonExtensions.Reading;
+
+namespace DiscordChatExporter.Core.Discord.Data
+{
+    // https://discord.com/developers/docs/resources/channel#attachment-object
+    public partial class Attachment : IHasId
+    {
+        public Snowflake Id { get; }
+
+        public string Url { get; }
+
+        public string FileName { get; }
+
+        public int? Width { get; }
+
+        public int? Height { get; }
+
+        public bool IsImage => ImageFileExtensions.Contains(Path.GetExtension(FileName));
+
+        public bool IsVideo => VideoFileExtensions.Contains(Path.GetExtension(FileName));
+
+        public bool IsAudio => AudioFileExtensions.Contains(Path.GetExtension(FileName));
+
+        public bool IsSpoiler =>
+            (IsImage || IsVideo || IsAudio) && FileName.StartsWith("SPOILER_", StringComparison.Ordinal);
+
+        public FileSize FileSize { get; }
+
+        public Attachment(
+            Snowflake id,
+            string url,
+            string fileName,
+            int? width,
+            int? height,
+            FileSize fileSize)
+        {
+            Id = id;
+            Url = url;
+            FileName = fileName;
+            Width = width;
+            Height = height;
+            FileSize = fileSize;
+        }
+
+        public override string ToString() => FileName;
+    }
+
+    public partial class Attachment
+    {
+        private static readonly HashSet<string> ImageFileExtensions = new(StringComparer.OrdinalIgnoreCase)
+            {".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"};
+
+        private static readonly HashSet<string> VideoFileExtensions = new(StringComparer.OrdinalIgnoreCase)
+            {".mp4", ".webm"};
+
+        private static readonly HashSet<string> AudioFileExtensions = new(StringComparer.OrdinalIgnoreCase)
+            {".mp3", ".wav", ".ogg", ".flac", ".m4a"};
+
+        public static Attachment Parse(JsonElement json)
+        {
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            var url = json.GetProperty("url").GetString();
+            var width = json.GetPropertyOrNull("width")?.GetInt32();
+            var height = json.GetPropertyOrNull("height")?.GetInt32();
+            var fileName = json.GetProperty("filename").GetString();
+            var fileSize = json.GetProperty("size").GetInt64().Pipe(FileSize.FromBytes);
+
+            return new Attachment(id, url, fileName, width, height, fileSize);
+        }
+    }
+}

DiscordChatExporter.Core/Discord/Data/Channel.cs

@@ -1,10 +1,11 @@
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+using DiscordChatExporter.Core.Discord.Data.Common;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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.
@@ -20,9 +21,9 @@ 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 string Id { get; }
+        public Snowflake Id { get; }
 
         public ChannelType Type { get; }
 
@@ -33,43 +34,58 @@ namespace DiscordChatExporter.Domain.Discord.Models
             Type == ChannelType.GuildNews ||
             Type == ChannelType.GuildStore;
 
-        public string GuildId { get; }
+        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(string id, ChannelType type, string 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
+        private static ChannelCategory GetFallbackCategory(ChannelType channelType) => new(
-        {
+            Snowflake.Zero,
-            ChannelType.GuildTextChat => "Text",
+            channelType switch
-            ChannelType.DirectTextChat => "Private",
+            {
-            ChannelType.DirectGroupTextChat => "Group",
+                ChannelType.GuildTextChat => "Text",
-            ChannelType.GuildNews => "News",
+                ChannelType.DirectTextChat => "Private",
-            ChannelType.GuildStore => "Store",
+                ChannelType.DirectGroupTextChat => "Group",
-            _ => "Default"
+                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();
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            var guildId = json.GetPropertyOrNull("guild_id")?.GetString();
+            var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
             var topic = json.GetPropertyOrNull("topic")?.GetString();
 
             var type = (ChannelType) json.GetProperty("type").GetInt32();
@@ -77,14 +93,17 @@ namespace DiscordChatExporter.Domain.Discord.Models
             var name =
                 json.GetPropertyOrNull("name")?.GetString() ??
                 json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
-                id;
+                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";
 
@@ -52,7 +38,7 @@ namespace DiscordChatExporter.Domain.Discord.Models.Common
             if (Math.Abs(TotalKiloBytes) >= 1)
                 return "KB";
 
-            return "B";
+            return "bytes";
         }
 
         public override string ToString() => $"{GetLargestWholeNumberValue():0.##} {GetLargestWholeNumberSymbol()}";
@@ -60,6 +46,6 @@ namespace DiscordChatExporter.Domain.Discord.Models.Common
 
     public partial struct FileSize
     {
-        public static FileSize FromBytes(long bytes) => new FileSize(bytes);
+        public static FileSize FromBytes(long bytes) => new(bytes);
     }
 }

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

@@ -0,0 +1,7 @@
+namespace DiscordChatExporter.Core.Discord.Data.Common
+{
+    public interface IHasId
+    {
+        Snowflake Id { get; }
+    }
+}

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

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace DiscordChatExporter.Core.Discord.Data.Common
+{
+    public partial class IdBasedEqualityComparer : IEqualityComparer<IHasId>
+    {
+        public bool Equals(IHasId? x, IHasId? y) => x?.Id == y?.Id;
+
+        public int GetHashCode(IHasId obj) => obj.Id.GetHashCode();
+    }
+
+    public partial class IdBasedEqualityComparer
+    {
+        public static IdBasedEqualityComparer Instance { get; } = new();
+    }
+}

DiscordChatExporter.Core/Discord/Data/Embed.cs

@@ -3,9 +3,10 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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 DiscordChatExporter.Domain.Internal.Extensions;
+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 DiscordChatExporter.Domain.Internal.Extensions;
+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 DiscordChatExporter.Domain.Internal.Extensions;
+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 DiscordChatExporter.Domain.Internal.Extensions;
+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

@@ -2,10 +2,10 @@
 using System.Linq;
 using System.Text;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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

@@ -1,18 +1,19 @@
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+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
     {
-        public string Id { get; }
+        public Snowflake Id { get; }
 
         public string Name { get; }
 
         public string IconUrl { get; }
 
-        public Guild(string id, string name, string iconUrl)
+        public Guild(Snowflake id, string name, string iconUrl)
         {
             Id = id;
             Name = name;
@@ -24,18 +25,21 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
     public partial class Guild
     {
-        public static Guild DirectMessages { get; } =
+        public static Guild DirectMessages { get; } = new(
-            new Guild("@me", "Direct Messages", GetDefaultIconUrl());
+            Snowflake.Zero,
+            "Direct Messages",
+            GetDefaultIconUrl()
+        );
 
         private static string GetDefaultIconUrl() =>
             "https://cdn.discordapp.com/embed/avatars/0.png";
 
-        private static string GetIconUrl(string id, string iconHash) =>
+        private static string GetIconUrl(Snowflake id, string iconHash) =>
             $"https://cdn.discordapp.com/icons/{id}/{iconHash}.png";
 
         public static Guild Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString();
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var name = json.GetProperty("name").GetString();
             var iconHash = json.GetProperty("icon").GetString();
 

DiscordChatExporter.Core/Discord/Data/Member.cs

@@ -2,23 +2,24 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+using DiscordChatExporter.Core.Discord.Data.Common;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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
     {
-        public string Id => User.Id;
+        public Snowflake Id => User.Id;
 
         public User User { get; }
 
         public string Nick { get; }
 
-        public IReadOnlyList<string> RoleIds { get; }
+        public IReadOnlyList<Snowflake> RoleIds { get; }
 
-        public Member(User user, string? nick, IReadOnlyList<string> roleIds)
+        public Member(User user, string? nick, IReadOnlyList<Snowflake> roleIds)
         {
             User = user;
             Nick = nick ?? user.Name;
@@ -30,8 +31,11 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
     public partial class Member
     {
-        public static Member CreateForUser(User user) =>
+        public static Member CreateForUser(User user) => new(
-            new Member(user, null, Array.Empty<string>());
+            user,
+            null,
+            Array.Empty<Snowflake>()
+        );
 
         public static Member Parse(JsonElement json)
         {
@@ -39,8 +43,8 @@ namespace DiscordChatExporter.Domain.Discord.Models
             var nick = json.GetPropertyOrNull("nick")?.GetString();
 
             var roleIds =
-                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetString()).ToArray() ??
+                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetString().Pipe(Snowflake.Parse)).ToArray() ??
-                Array.Empty<string>();
+                Array.Empty<Snowflake>();
 
             return new Member(
                 user,

DiscordChatExporter.Core/Discord/Data/Message.cs

@@ -2,28 +2,30 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+using DiscordChatExporter.Core.Discord.Data.Common;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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
     {
-        Default,
+        Default = 0,
-        RecipientAdd,
+        RecipientAdd = 1,
-        RecipientRemove,
+        RecipientRemove = 2,
-        Call,
+        Call = 3,
-        ChannelNameChange,
+        ChannelNameChange = 4,
-        ChannelIconChange,
+        ChannelIconChange = 5,
-        ChannelPinnedMessage,
+        ChannelPinnedMessage = 6,
-        GuildMemberJoin
+        GuildMemberJoin = 7,
+        Reply = 19
     }
 
     // https://discord.com/developers/docs/resources/channel#message-object
     public partial class Message : IHasId
     {
-        public string Id { get; }
+        public Snowflake Id { get; }
 
         public MessageType Type { get; }
 
@@ -33,6 +35,8 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public DateTimeOffset? EditedTimestamp { get; }
 
+        public DateTimeOffset? CallEndedTimestamp { get; }
+
         public bool IsPinned { get; }
 
         public string Content { get; }
@@ -45,30 +49,40 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public IReadOnlyList<User> MentionedUsers { get; }
 
+        public MessageReference? Reference { get; }
+
+        public Message? ReferencedMessage { get; }
+
         public Message(
-            string id,
+            Snowflake id,
             MessageType type,
             User author,
             DateTimeOffset timestamp,
             DateTimeOffset? editedTimestamp,
+            DateTimeOffset? callEndedTimestamp,
             bool isPinned,
             string content,
             IReadOnlyList<Attachment> attachments,
             IReadOnlyList<Embed> embeds,
             IReadOnlyList<Reaction> reactions,
-            IReadOnlyList<User> mentionedUsers)
+            IReadOnlyList<User> mentionedUsers,
+            MessageReference? messageReference,
+            Message? referencedMessage)
         {
             Id = id;
             Type = type;
             Author = author;
             Timestamp = timestamp;
             EditedTimestamp = editedTimestamp;
+            CallEndedTimestamp = callEndedTimestamp;
             IsPinned = isPinned;
             Content = content;
             Attachments = attachments;
             Embeds = embeds;
             Reactions = reactions;
             MentionedUsers = mentionedUsers;
+            Reference = messageReference;
+            ReferencedMessage = referencedMessage;
         }
 
         public override string ToString() => Content;
@@ -78,18 +92,22 @@ namespace DiscordChatExporter.Domain.Discord.Models
     {
         public static Message Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString();
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var author = json.GetProperty("author").Pipe(User.Parse);
             var timestamp = json.GetProperty("timestamp").GetDateTimeOffset();
             var editedTimestamp = json.GetPropertyOrNull("edited_timestamp")?.GetDateTimeOffset();
+            var callEndedTimestamp = json.GetPropertyOrNull("call")?.GetPropertyOrNull("ended_timestamp")?.GetDateTimeOffset();
             var type = (MessageType) json.GetProperty("type").GetInt32();
             var isPinned = json.GetPropertyOrNull("pinned")?.GetBoolean() ?? false;
+            var messageReference = json.GetPropertyOrNull("message_reference")?.Pipe(MessageReference.Parse);
+            var referencedMessage = json.GetPropertyOrNull("referenced_message")?.Pipe(Message.Parse);
 
             var content = type switch
             {
                 MessageType.RecipientAdd => "Added a recipient.",
                 MessageType.RecipientRemove => "Removed a recipient.",
-                MessageType.Call => "Started a call.",
+                MessageType.Call =>
+                    $"Started a call that lasted {callEndedTimestamp?.Pipe(t => t - timestamp).Pipe(t => (int) t.TotalMinutes) ?? 0} minutes.",
                 MessageType.ChannelNameChange => "Changed the channel name.",
                 MessageType.ChannelIconChange => "Changed the channel icon.",
                 MessageType.ChannelPinnedMessage => "Pinned a message.",
@@ -119,12 +137,15 @@ namespace DiscordChatExporter.Domain.Discord.Models
                 author,
                 timestamp,
                 editedTimestamp,
+                callEndedTimestamp,
                 isPinned,
                 content,
                 attachments,
                 embeds,
                 reactions,
-                mentionedUsers
+                mentionedUsers,
+                messageReference,
+                referencedMessage
             );
         }
     }

DiscordChatExporter.Core/Discord/Data/MessageReference.cs

@@ -0,0 +1,37 @@
+using System.Text.Json;
+using DiscordChatExporter.Core.Utils.Extensions;
+using JsonExtensions.Reading;
+
+namespace DiscordChatExporter.Core.Discord.Data
+{
+    // https://discord.com/developers/docs/resources/channel#message-object-message-reference-structure
+    public partial class MessageReference
+    {
+        public Snowflake? MessageId { get; }
+
+        public Snowflake? ChannelId { get; }
+
+        public Snowflake? GuildId { get; }
+
+        public MessageReference(Snowflake? messageId, Snowflake? channelId, Snowflake? guildId)
+        {
+            MessageId = messageId;
+            ChannelId = channelId;
+            GuildId = guildId;
+        }
+
+        public override string ToString() => MessageId?.ToString() ?? "<unknown reference>";
+    }
+
+    public partial class MessageReference
+    {
+        public static MessageReference Parse(JsonElement json)
+        {
+            var messageId = json.GetPropertyOrNull("message_id")?.GetString().Pipe(Snowflake.Parse);
+            var channelId = json.GetPropertyOrNull("channel_id")?.GetString().Pipe(Snowflake.Parse);
+            var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
+
+            return new MessageReference(messageId, channelId, guildId);
+        }
+    }
+}

DiscordChatExporter.Core/Discord/Data/Reaction.cs

@@ -1,7 +1,7 @@
 using System.Text.Json;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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

@@ -1,13 +1,15 @@
 using System.Drawing;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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
+    public partial class Role : IHasId
     {
-        public string Id { get; }
+        public Snowflake Id { get; }
 
         public string Name { get; }
 
@@ -15,7 +17,11 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public Color? Color { get; }
 
-        public Role(string id, string name, int position, Color? color)
+        public Role(
+            Snowflake id,
+            string name,
+            int position,
+            Color? color)
         {
             Id = id;
             Name = name;
@@ -30,7 +36,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
     {
         public static Role Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString();
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var name = json.GetProperty("name").GetString();
             var position = json.GetProperty("position").GetInt32();
 

DiscordChatExporter.Core/Discord/Data/User.cs

@@ -1,26 +1,34 @@
 using System;
 using System.Text.Json;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+using DiscordChatExporter.Core.Discord.Data.Common;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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
     {
-        public string Id { get; }
+        public Snowflake Id { get; }
 
         public bool IsBot { get; }
 
         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(string 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;
@@ -37,7 +45,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
         private static string GetDefaultAvatarUrl(int discriminator) =>
             $"https://cdn.discordapp.com/embed/avatars/{discriminator % 5}.png";
 
-        private static string GetAvatarUrl(string id, string avatarHash)
+        private static string GetAvatarUrl(Snowflake id, string avatarHash)
         {
             // Animated
             if (avatarHash.StartsWith("a_", StringComparison.Ordinal))
@@ -49,7 +57,7 @@ namespace DiscordChatExporter.Domain.Discord.Models
 
         public static User Parse(JsonElement json)
         {
-            var id = json.GetProperty("id").GetString();
+            var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var discriminator = json.GetProperty("discriminator").GetString().Pipe(int.Parse);
             var name = json.GetProperty("username").GetString();
             var avatarHash = json.GetProperty("avatar").GetString();

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -5,54 +5,40 @@ using System.Net;
 using System.Net.Http;
 using System.Text.Json;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exceptions;
+using DiscordChatExporter.Core.Exceptions;
-using DiscordChatExporter.Domain.Internal;
+using DiscordChatExporter.Core.Utils;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Utils.Extensions;
-using Polly;
+using JsonExtensions.Http;
+using JsonExtensions.Reading;
+using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Discord
+namespace DiscordChatExporter.Core.Discord
 {
     public class DiscordClient
     {
+        private readonly HttpClient _httpClient;
         private readonly AuthToken _token;
-        private readonly HttpClient _httpClient = Singleton.HttpClient;
-        private readonly IAsyncPolicy<HttpResponseMessage> _httpRequestPolicy;
 
-        private readonly Uri _baseUri = new Uri("https://discord.com/api/v6/", UriKind.Absolute);
+        private readonly Uri _baseUri = new("https://discord.com/api/v8/", UriKind.Absolute);
 
-        public DiscordClient(AuthToken token)
+        public DiscordClient(HttpClient httpClient, AuthToken token)
         {
+            _httpClient = httpClient;
             _token = token;
-
-            // Discord seems to always respond with 429 on the first request with unreasonable wait time (10+ minutes).
-            // For that reason the policy will ignore such errors at first, then wait a constant amount of time, and
-            // finally wait the specified amount of time, based on how many requests have failed in a row.
-            _httpRequestPolicy = Policy
-                .HandleResult<HttpResponseMessage>(m => m.StatusCode == HttpStatusCode.TooManyRequests)
-                .OrResult(m => m.StatusCode >= HttpStatusCode.InternalServerError)
-                .WaitAndRetryAsync(6,
-                    (i, result, ctx) =>
-                    {
-                        if (i <= 3)
-                            return TimeSpan.FromSeconds(2 * i);
-
-                        if (i <= 5)
-                            return TimeSpan.FromSeconds(5 * i);
-
-                        return result.Result.Headers.RetryAfter.Delta ?? TimeSpan.FromSeconds(10 * i);
-                    },
-                    (response, timespan, retryCount, context) => Task.CompletedTask
-                );
         }
 
-        private async ValueTask<HttpResponseMessage> GetResponseAsync(string url) => await _httpRequestPolicy.ExecuteAsync(async () =>
+        public DiscordClient(AuthToken token)
-        {
+            : this(Http.Client, token) {}
-            using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(_baseUri, url));
-            request.Headers.Authorization = _token.GetAuthorizationHeader();
 
-            return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
+        private async ValueTask<HttpResponseMessage> GetResponseAsync(string url) =>
-        });
+            await Http.ResponsePolicy.ExecuteAsync(async () =>
+            {
+                using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(_baseUri, url));
+                request.Headers.Authorization = _token.GetAuthenticationHeader();
+
+                return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
+            });
 
         private async ValueTask<JsonElement> GetJsonResponseAsync(string url)
         {
@@ -85,13 +71,14 @@ namespace DiscordChatExporter.Domain.Discord
         {
             yield return Guild.DirectMessages;
 
-            var afterId = "";
+            var currentAfter = Snowflake.Zero;
+
             while (true)
             {
                 var url = new UrlBuilder()
                     .SetPath("users/@me/guilds")
                     .SetQueryParameter("limit", "100")
-                    .SetQueryParameter("after", afterId)
+                    .SetQueryParameter("after", currentAfter.ToString())
                     .Build();
 
                 var response = await GetJsonResponseAsync(url);
@@ -101,7 +88,7 @@ namespace DiscordChatExporter.Domain.Discord
                 {
                     yield return guild;
 
-                    afterId = guild.Id;
+                    currentAfter = guild.Id;
                     isEmpty = false;
                 }
 
@@ -110,7 +97,7 @@ namespace DiscordChatExporter.Domain.Discord
             }
         }
 
-        public async ValueTask<Guild> GetGuildAsync(string guildId)
+        public async ValueTask<Guild> GetGuildAsync(Snowflake guildId)
         {
             if (guildId == Guild.DirectMessages.Id)
                 return Guild.DirectMessages;
@@ -119,7 +106,7 @@ namespace DiscordChatExporter.Domain.Discord
             return Guild.Parse(response);
         }
 
-        public async IAsyncEnumerable<Channel> GetGuildChannelsAsync(string guildId)
+        public async IAsyncEnumerable<Channel> GetGuildChannelsAsync(Snowflake guildId)
         {
             if (guildId == Guild.DirectMessages.Id)
             {
@@ -131,32 +118,40 @@ namespace DiscordChatExporter.Domain.Discord
             {
                 var response = await GetJsonResponseAsync($"guilds/{guildId}/channels");
 
-                var categories = response
+                var orderedResponse = response
                     .EnumerateArray()
-                    .ToDictionary(
+                    .OrderBy(j => j.GetProperty("position").GetInt32())
-                        j => j.GetProperty("id").GetString(),
+                    .ThenBy(j => ulong.Parse(j.GetProperty("id").GetString()))
-                        j => j.GetProperty("name").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;
                 }
             }
         }
 
-        public async IAsyncEnumerable<Role> GetGuildRolesAsync(string guildId)
+        public async IAsyncEnumerable<Role> GetGuildRolesAsync(Snowflake guildId)
         {
             if (guildId == Guild.DirectMessages.Id)
                 yield break;
@@ -167,7 +162,7 @@ namespace DiscordChatExporter.Domain.Discord
                 yield return Role.Parse(roleJson);
         }
 
-        public async ValueTask<Member?> TryGetGuildMemberAsync(string guildId, User user)
+        public async ValueTask<Member?> TryGetGuildMemberAsync(Snowflake guildId, User user)
         {
             if (guildId == Guild.DirectMessages.Id)
                 return Member.CreateForUser(user);
@@ -176,30 +171,43 @@ namespace DiscordChatExporter.Domain.Discord
             return response?.Pipe(Member.Parse);
         }
 
-        private async ValueTask<string> GetChannelCategoryAsync(string channelParentId)
+        public async ValueTask<ChannelCategory> GetChannelCategoryAsync(Snowflake channelId)
         {
-            var response = await GetJsonResponseAsync($"channels/{channelParentId}");
+            try
-            return response.GetProperty("name").GetString();
+            {
+                var response = await GetJsonResponseAsync($"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(string channelId)
+        public async ValueTask<Channel> GetChannelAsync(Snowflake channelId)
         {
             var response = await GetJsonResponseAsync($"channels/{channelId}");
 
-            var parentId = response.GetPropertyOrNull("parent_id")?.GetString();
+            var parentId = response.GetPropertyOrNull("parent_id")?.GetString().Pipe(Snowflake.Parse);
-            var category = !string.IsNullOrWhiteSpace(parentId)
+
-                ? await GetChannelCategoryAsync(parentId)
+            var category = parentId is not null
+                ? await GetChannelCategoryAsync(parentId.Value)
                 : null;
 
             return Channel.Parse(response, category);
         }
 
-        private async ValueTask<Message?> TryGetLastMessageAsync(string channelId, DateTimeOffset? before = null)
+        private async ValueTask<Message?> TryGetLastMessageAsync(Snowflake channelId, Snowflake? before = null)
         {
             var url = new UrlBuilder()
                 .SetPath($"channels/{channelId}/messages")
                 .SetQueryParameter("limit", "1")
-                .SetQueryParameter("before", before?.ToSnowflake())
+                .SetQueryParameter("before", before?.ToString())
                 .Build();
 
             var response = await GetJsonResponseAsync(url);
@@ -207,9 +215,9 @@ namespace DiscordChatExporter.Domain.Discord
         }
 
         public async IAsyncEnumerable<Message> GetMessagesAsync(
-            string channelId,
+            Snowflake channelId,
-            DateTimeOffset? after = null,
+            Snowflake? after = null,
-            DateTimeOffset? before = null,
+            Snowflake? before = null,
             IProgress<double>? progress = null)
         {
             // Get the last message in the specified range.
@@ -217,19 +225,19 @@ 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)
+            if (lastMessage is null || lastMessage.Timestamp < after?.ToDate())
                 yield break;
 
             // Keep track of first message in range in order to calculate progress
             var firstMessage = default(Message);
-            var afterId = after?.ToSnowflake() ?? "0";
+            var currentAfter = after ?? Snowflake.Zero;
 
             while (true)
             {
                 var url = new UrlBuilder()
                     .SetPath($"channels/{channelId}/messages")
                     .SetQueryParameter("limit", "100")
-                    .SetQueryParameter("after", afterId)
+                    .SetQueryParameter("after", currentAfter.ToString())
                     .Build();
 
                 var response = await GetJsonResponseAsync(url);
@@ -252,16 +260,28 @@ namespace DiscordChatExporter.Domain.Discord
                     if (message.Timestamp > lastMessage.Timestamp)
                         yield break;
 
-                    // Report progress based on the duration of parsed messages divided by total
+                    // Report progress based on the duration of exported messages divided by total
-                    progress?.Report(
+                    if (progress is not null)
-                        (message.Timestamp - firstMessage.Timestamp) /
+                    {
-                        (lastMessage.Timestamp - firstMessage.Timestamp)
+                        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;
-                    afterId = message.Id;
+                    currentAfter = message.Id;
                 }
             }
         }
     }
-}
+}

DiscordChatExporter.Core/Discord/Snowflake.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Globalization;
+using System.Text.RegularExpressions;
+
+namespace DiscordChatExporter.Core.Discord
+{
+    public readonly partial struct Snowflake
+    {
+        public ulong Value { get; }
+
+        public Snowflake(ulong value) => Value = value;
+
+        public DateTimeOffset ToDate() =>
+            DateTimeOffset.FromUnixTimeMilliseconds((long) ((Value >> 22) + 1420070400000UL)).ToLocalTime();
+
+        public override string ToString() => Value.ToString(CultureInfo.InvariantCulture);
+    }
+
+    public partial struct Snowflake
+    {
+        public static Snowflake Zero { get; } = new(0);
+
+        public static Snowflake FromDate(DateTimeOffset date)
+        {
+            var value = ((ulong) date.ToUnixTimeMilliseconds() - 1420070400000UL) << 22;
+            return new Snowflake(value);
+        }
+
+        public static Snowflake? TryParse(string? str, IFormatProvider? formatProvider = null)
+        {
+            if (string.IsNullOrWhiteSpace(str))
+                return null;
+
+            // As number
+            if (Regex.IsMatch(str, @"^\d+$") &&
+                ulong.TryParse(str, NumberStyles.Number, formatProvider, out var value))
+            {
+                return new Snowflake(value);
+            }
+
+            // As date
+            if (DateTimeOffset.TryParse(str, formatProvider, DateTimeStyles.None, out var date))
+            {
+                return FromDate(date);
+            }
+
+            return null;
+        }
+
+        public static Snowflake Parse(string str, IFormatProvider? formatProvider) =>
+            TryParse(str, formatProvider) ?? throw new FormatException($"Invalid snowflake '{str}'.");
+
+        public static Snowflake Parse(string str) => Parse(str, null);
+    }
+
+    public partial struct Snowflake : IEquatable<Snowflake>
+    {
+        public bool Equals(Snowflake other) => Value == other.Value;
+
+        public override bool Equals(object? obj) => obj is Snowflake other && Equals(other);
+
+        public override int GetHashCode() => Value.GetHashCode();
+
+        public static bool operator ==(Snowflake left, Snowflake right) => left.Equals(right);
+
+        public static bool operator !=(Snowflake left, Snowflake right) => !(left == right);
+    }
+}

DiscordChatExporter.Core/DiscordChatExporter.Core.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="JsonExtensions" Version="1.0.1" />
+    <PackageReference Include="MiniRazor.CodeGen" Version="2.1.2" />
+    <PackageReference Include="Polly" Version="7.2.2" />
+    <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Exporting\Writers\Html\Core.css" />
+    <EmbeddedResource Include="Exporting\Writers\Html\Dark.css" />
+    <EmbeddedResource Include="Exporting\Writers\Html\Light.css" />
+    <AdditionalFiles Include="Exporting\Writers\Html\PreambleTemplate.cshtml" IsRazorTemplate="true" />
+    <AdditionalFiles Include="Exporting\Writers\Html\PostambleTemplate.cshtml" IsRazorTemplate="true" />
+    <AdditionalFiles Include="Exporting\Writers\Html\MessageGroupTemplate.cshtml" IsRazorTemplate="true" />
+  </ItemGroup>
+
+</Project>

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()
+        internal static DiscordChatExporterException Unauthorized() =>
-        {
+            new("Authentication token is invalid.");
-            const string message = "Authentication token is invalid.";
-            return new DiscordChatExporterException(message);
-        }
 
-        internal static DiscordChatExporterException Forbidden()
+        internal static DiscordChatExporterException Forbidden() =>
-        {
+            new("Access is forbidden.");
-            const string message = "Access is forbidden.";
-            return new DiscordChatExporterException(message);
-        }
 
-        internal static DiscordChatExporterException NotFound()
+        internal static DiscordChatExporterException NotFound() =>
-        {
+            new("Requested resource does not exist.");
-            const string message = "Requested resource does not exist.";
-            return new DiscordChatExporterException(message);
-        }
 
-        internal static DiscordChatExporterException ChannelIsEmpty(string channel)
+        internal static DiscordChatExporterException ChannelIsEmpty() =>
-        {
+            new("No messages found for the specified period.");
-            var message = $"Channel '{channel}' contains no messages for the specified period.";
-            return new DiscordChatExporterException(message);
-        }
     }
 }

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.Core.Discord;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Discord.Models.Common;
+using DiscordChatExporter.Core.Discord.Data.Common;
-using DiscordChatExporter.Domain.Exceptions;
+using DiscordChatExporter.Core.Exceptions;
-using DiscordChatExporter.Domain.Utilities;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     public class ChannelExporter
     {
@@ -59,7 +59,7 @@ namespace DiscordChatExporter.Domain.Exporting
 
             // Throw if no messages were exported
             if (!exportedAnything)
-                throw DiscordChatExporterException.ChannelIsEmpty(request.Channel.Name);
+                throw DiscordChatExporterException.ChannelIsEmpty();
         }
     }
 }

DiscordChatExporter.Core/Exporting/ExportContext.cs

@@ -5,11 +5,12 @@ using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Discord.Data;
+using DiscordChatExporter.Core.Utils.Extensions;
 using Tyrrrz.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting
+namespace DiscordChatExporter.Core.Exporting
 {
     internal class ExportContext
     {
@@ -34,27 +35,29 @@ namespace DiscordChatExporter.Domain.Exporting
             Channels = channels;
             Roles = roles;
 
-            _mediaDownloader = new MediaDownloader(request.OutputMediaDirPath);
+            _mediaDownloader = new MediaDownloader(request.OutputMediaDirPath, request.ShouldReuseMedia);
         }
 
-        public string FormatDate(DateTimeOffset date) => date.ToLocalString(Request.DateFormat);
+        public string FormatDate(DateTimeOffset date) => Request.DateFormat switch
+        {
+            "unix" => date.ToUnixTimeSeconds().ToString(),
+            "unixms" => date.ToUnixTimeMilliseconds().ToString(),
+            var dateFormat => date.ToLocalString(dateFormat)
+        };
 
-        public Member? TryGetMember(string id) =>
+        public Member? TryGetMember(Snowflake id) => Members.FirstOrDefault(m => m.Id == id);
-            Members.FirstOrDefault(m => m.Id == id);
 
-        public Channel? TryGetChannel(string id) =>
+        public Channel? TryGetChannel(Snowflake id) => Channels.FirstOrDefault(c => c.Id == id);
-            Channels.FirstOrDefault(c => c.Id == id);
 
-        public Role? TryGetRole(string id) =>
+        public Role? TryGetRole(Snowflake id) => Roles.FirstOrDefault(r => r.Id == id);
-            Roles.FirstOrDefault(r => r.Id == id);
 
-        public Color? TryGetUserColor(string id)
+        public Color? TryGetUserColor(Snowflake id)
         {
             var member = TryGetMember(id);
             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();
@@ -69,10 +72,13 @@ namespace DiscordChatExporter.Domain.Exporting
             {
                 var filePath = await _mediaDownloader.DownloadAsync(url);
 
-                // We want relative path so that the output files can be copied around without breaking
+                // We want relative path so that the output files can be copied around without breaking.
-                var relativeFilePath = Path.GetRelativePath(Request.OutputBaseDirPath, filePath);
+                // Base directory path may be null if the file is stored at the root or relative to working directory.
+                var relativeFilePath = !string.IsNullOrWhiteSpace(Request.OutputBaseDirPath)
+                    ? Path.GetRelativePath(Request.OutputBaseDirPath, filePath)
+                    : filePath;
 
-                // For HTML, we need to format the URL properly
+                // HACK: for HTML, we need to format the URL properly
                 if (Request.Format == ExportFormat.HtmlDark || Request.Format == ExportFormat.HtmlLight)
                 {
                     // Need to escape each path segment while keeping the directory separators intact
@@ -84,8 +90,12 @@ namespace DiscordChatExporter.Domain.Exporting
 
                 return relativeFilePath;
             }
-            catch (HttpRequestException)
+            // Try to catch only exceptions related to failed HTTP requests
+            // https://github.com/Tyrrrz/DiscordChatExporter/issues/332
+            // https://github.com/Tyrrrz/DiscordChatExporter/issues/372
+            catch (Exception ex) when (ex is HttpRequestException || ex is OperationCanceledException)
             {
+                // TODO: add logging so we can be more liberal with catching exceptions
                 // We don't want this to crash the exporting process in case of failure
                 return url;
             }

DiscordChatExporter.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;
 using System.IO;
 using System.Text;
-using DiscordChatExporter.Domain.Discord.Models;
+using System.Text.RegularExpressions;
-using DiscordChatExporter.Domain.Internal;
+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
     {
@@ -22,14 +25,16 @@ namespace DiscordChatExporter.Domain.Exporting
 
         public ExportFormat Format { get; }
 
-        public DateTimeOffset? After { get; }
+        public Snowflake? After { get; }
 
-        public DateTimeOffset? Before { get; }
+        public Snowflake? Before { get; }
 
-        public int? PartitionLimit { get; }
+        public PartitionLimit PartitionLimit { get; }
 
         public bool ShouldDownloadMedia { get; }
 
+        public bool ShouldReuseMedia { get; }
+
         public string DateFormat { get; }
 
         public ExportRequest(
@@ -37,10 +42,11 @@ namespace DiscordChatExporter.Domain.Exporting
             Channel channel,
             string outputPath,
             ExportFormat format,
-            DateTimeOffset? after,
+            Snowflake? after,
-            DateTimeOffset? before,
+            Snowflake? before,
-            int? partitionLimit,
+            PartitionLimit partitionLimit,
             bool shouldDownloadMedia,
+            bool shouldReuseMedia,
             string dateFormat)
         {
             Guild = guild;
@@ -51,6 +57,7 @@ namespace DiscordChatExporter.Domain.Exporting
             Before = before;
             PartitionLimit = partitionLimit;
             ShouldDownloadMedia = shouldDownloadMedia;
+            ShouldReuseMedia = shouldReuseMedia;
             DateFormat = dateFormat;
 
             OutputBaseFilePath = GetOutputBaseFilePath(
@@ -74,9 +81,29 @@ namespace DiscordChatExporter.Domain.Exporting
             Channel channel,
             string outputPath,
             ExportFormat format,
-            DateTimeOffset? after = null,
+            Snowflake? after = null,
-            DateTimeOffset? before = 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)))
             {
@@ -92,33 +119,33 @@ namespace DiscordChatExporter.Domain.Exporting
             Guild guild,
             Channel channel,
             ExportFormat format,
-            DateTimeOffset? after = null,
+            Snowflake? after = null,
-            DateTimeOffset? before = null)
+            Snowflake? before = null)
         {
             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($"{after:yyyy-MM-dd} to {before:yyyy-MM-dd}");
+                    buffer.Append($"{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($"after {after:yyyy-MM-dd}");
+                    buffer.Append($"after {after?.ToDate():yyyy-MM-dd}");
                 }
                 // Only 'before' is set
                 else
                 {
-                    buffer.Append($"before {before:yyyy-MM-dd}");
+                    buffer.Append($"before {before?.ToDate():yyyy-MM-dd}");
                 }
 
                 buffer.Append(")");

DiscordChatExporter.Core/Exporting/MediaDownloader.cs

@@ -0,0 +1,105 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using DiscordChatExporter.Core.Utils;
+using DiscordChatExporter.Core.Utils.Extensions;
+
+namespace DiscordChatExporter.Core.Exporting
+{
+    internal partial class MediaDownloader
+    {
+        private readonly HttpClient _httpClient;
+        private readonly string _workingDirPath;
+        private readonly bool _reuseMedia;
+
+        // URL -> Local file path
+        private readonly Dictionary<string, string> _pathCache = new(StringComparer.Ordinal);
+
+        public MediaDownloader(HttpClient httpClient, string workingDirPath, bool reuseMedia)
+        {
+            _httpClient = httpClient;
+            _workingDirPath = workingDirPath;
+            _reuseMedia = reuseMedia;
+        }
+
+        public MediaDownloader(string workingDirPath, bool reuseMedia)
+            : this(Http.Client, workingDirPath, reuseMedia) {}
+
+        public async ValueTask<string> DownloadAsync(string url)
+        {
+            if (_pathCache.TryGetValue(url, out var cachedFilePath))
+                return cachedFilePath;
+
+            var fileName = GetFileNameFromUrl(url);
+            var filePath = Path.Combine(_workingDirPath, fileName);
+
+            // Reuse existing files if we're allowed to
+            if (_reuseMedia && File.Exists(filePath))
+                return _pathCache[url] = filePath;
+
+            Directory.CreateDirectory(_workingDirPath);
+
+            // This catches IOExceptions which is dangerous as we're working also with files
+            await Http.ExceptionPolicy.ExecuteAsync(async () =>
+            {
+                // Download the file
+                using var response = await _httpClient.GetAsync(url);
+                await using (var output = File.Create(filePath))
+                {
+                    await response.Content.CopyToAsync(output);
+                }
+
+                // Try to set the file date according to the last-modified header
+                var lastModified = response.Content.Headers.TryGetValue("Last-Modified")?.Pipe(s =>
+                    DateTimeOffset.TryParse(s, CultureInfo.InvariantCulture, DateTimeStyles.None, out var date)
+                        ? date
+                        : (DateTimeOffset?) null
+                );
+
+                if (lastModified is not null)
+                {
+                    File.SetCreationTimeUtc(filePath, lastModified.Value.UtcDateTime);
+                    File.SetLastWriteTimeUtc(filePath, lastModified.Value.UtcDateTime);
+                    File.SetLastAccessTimeUtc(filePath, lastModified.Value.UtcDateTime);
+                }
+            });
+
+            return _pathCache[url] = filePath;
+        }
+    }
+
+    internal partial class MediaDownloader
+    {
+        private static string GetUrlHash(string url)
+        {
+            using var hash = SHA256.Create();
+
+            var data = hash.ComputeHash(Encoding.UTF8.GetBytes(url));
+            return data.ToHex().Truncate(5); // 5 chars ought to be enough for anybody
+        }
+
+        private static string GetFileNameFromUrl(string url)
+        {
+            var urlHash = GetUrlHash(url);
+
+            // Try to extract file name from URL
+            var fileName = Regex.Match(url, @".+/([^?]*)").Groups[1].Value;
+
+            // If it's not there, just use the URL hash as the file name
+            if (string.IsNullOrWhiteSpace(fileName))
+                return urlHash;
+
+            // Otherwise, use the original file name but inject the hash in the middle
+            var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
+            var fileExtension = Path.GetExtension(fileName);
+
+            return PathEx.EscapePath(fileNameWithoutExtension.Truncate(42) + '-' + urlHash + fileExtension);
+        }
+    }
+}

DiscordChatExporter.Core/Exporting/MessageExporter.cs

@@ -1,16 +1,15 @@
 using System;
 using System.IO;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exporting.Writers;
+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();
@@ -82,16 +75,17 @@ namespace DiscordChatExporter.Domain.Exporting
             var fileNameWithoutExt = Path.GetFileNameWithoutExtension(baseFilePath);
             var fileExt = Path.GetExtension(baseFilePath);
             var fileName = $"{fileNameWithoutExt} [part {partitionIndex + 1}]{fileExt}";
-
-            // Generate new path
             var dirPath = Path.GetDirectoryName(baseFilePath);
-            if (!string.IsNullOrWhiteSpace(dirPath))
-                return Path.Combine(dirPath, fileName);
 
-            return fileName;
+            return !string.IsNullOrWhiteSpace(dirPath)
+                ? Path.Combine(dirPath, fileName)
+                : fileName;
         }
 
-        private static MessageWriter CreateMessageWriter(string filePath, ExportFormat format, ExportContext context)
+        private static MessageWriter CreateMessageWriter(
+            string filePath,
+            ExportFormat format,
+            ExportContext context)
         {
             // Stream will be disposed by the underlying writer
             var stream = File.Create(filePath);

DiscordChatExporter.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.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
-using DiscordChatExporter.Domain.Internal.Extensions;
+using DiscordChatExporter.Core.Utils.Extensions;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal partial class CsvMessageWriter : MessageWriter
     {
@@ -58,8 +58,10 @@ 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));
+            await _writer.WriteAsync(CsvEncode(message.Author.Id.ToString()));
             await _writer.WriteAsync(',');
 
             // Author name

DiscordChatExporter.Core/Exporting/Writers/Html/Core.css

@@ -2,31 +2,31 @@
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/6c6374bad0b0b6d204d8d6dc4a18d820.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-300.woff);
     font-weight: 300;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/e8acd7d9bf6207f99350ca9f9e23b168.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-400.woff);
     font-weight: 400;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/3bdef1251a424500c1b3a78dea9b7e57.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-500.woff);
     font-weight: 500;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/be0060dafb7a0e31d2a1ca17c0708636.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-600.woff);
     font-weight: 600;
 }
 
 @font-face {
     font-family: Whitney;
-    src: url(https://discord.com/assets/8e12fb4f14d9c4592eb8ec9f22337b04.woff);
+    src: url(https://cdn.jsdelivr.net/gh/Tyrrrz/DiscordFonts@master/whitney-700.woff);
     font-weight: 700;
 }
 
@@ -49,13 +49,18 @@ img {
 
 .markdown {
     max-width: 100%;
-    white-space: pre-wrap;
     line-height: 1.3;
     overflow-wrap: break-word;
 }
 
+.preserve-whitespace {
+    white-space: pre-wrap;
+}
+
 .spoiler {
-    width: fit-content;
+    /* width: fit-content; */
+    display: inline-block;
+    /* This is more consistent across browsers, the old attribute worked well under Chrome but not FireFox. */
 }
 
 .spoiler--hidden {
@@ -84,7 +89,7 @@ img {
     box-shadow: 0 0 1px 1px rgba(0, 0, 0, 0.1);
 }
 
-.spoiler--hidden .spoiler-image img {
+.spoiler--hidden .spoiler-image * {
     filter: blur(44px);
 }
 
@@ -97,7 +102,7 @@ img {
     top: 50%;
     transform: translate(-50%, -50%);
     font-weight: 600;
-    padding: 0.5em 0.7em;
+    padding: 100%;
     border-radius: 20px;
     letter-spacing: 0.05em;
     font-size: 0.9em;
@@ -202,6 +207,58 @@ img {
     grid-template-columns: auto 1fr;
 }
 
+.chatlog__reference-symbol {
+    grid-column: 1;
+    border-style: solid;
+    border-width: 2px 0 0 2px;
+    border-radius: 8px 0 0 0;
+    margin-left: 16px;
+    margin-top: 8px;
+}
+
+.chatlog__reference {
+    display: flex;
+    grid-column: 2;
+    margin-left: 1.2em;
+    margin-bottom: 0.25em;
+    font-size: 0.875em;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    align-items: center;
+}
+
+.chatlog__reference-avatar {
+    border-radius: 50%;
+    height: 16px;
+    width: 16px;
+    margin-right: 0.25em;
+}
+
+.chatlog__reference-name {
+    margin-right: 0.25em;
+    font-weight: 600;
+}
+
+.chatlog__reference-link {
+    flex-grow: 1;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.chatlog__reference-link:hover {
+    text-decoration: none;
+}
+
+.chatlog__reference-content > * {
+    display: inline;
+}
+
+.chatlog__reference-edited-timestamp {
+    margin-left: 0.25em;
+    font-size: 0.8em;
+}
+
 .chatlog__author-avatar-container {
     grid-column: 1;
     width: 40px;
@@ -257,6 +314,53 @@ img {
     border-radius: 3px;
 }
 
+.chatlog__attachment-container {
+    height: 40px;
+    width: 100%;
+    max-width: 520px;
+    padding: 10px;
+    border: 1px solid;
+    border-radius: 3px;
+    overflow: hidden;
+}
+
+.chatlog__attachment-icon {
+    float: left;
+    height: 100%;
+    margin-right: 10px;
+}
+
+.chatlog__attachment-icon > .a {
+    fill: #f4f5fb;
+    d: path("M50,935a25,25,0,0,1-25-25V50A25,25,0,0,1,50,25H519.6L695,201.32V910a25,25,0,0,1-25,25Z");
+}
+
+.chatlog__attachment-icon > .b {
+    fill: #7789c4;
+    d: path("M509.21,50,670,211.63V910H50V50H509.21M530,0H50A50,50,0,0,0,0,50V910a50,50,0,0,0,50,50H670a50,50,0,0,0,50-50h0V191Z");
+}
+
+.chatlog__attachment-icon > .c {
+    fill: #f4f5fb;
+    d: path("M530,215a25,25,0,0,1-25-25V50a25,25,0,0,1,16.23-23.41L693.41,198.77A25,25,0,0,1,670,215Z");
+}
+
+.chatlog__attachment-icon > .d {
+    fill: #7789c4;
+    d: path("M530,70.71,649.29,190H530V70.71M530,0a50,50,0,0,0-50,50V190a50,50,0,0,0,50,50H670a50,50,0,0,0,50-50Z");
+}
+
+.chatlog__attachment-filesize {
+    color: #72767d;
+    font-size: 12px;
+}
+
+.chatlog__attachment-filename {
+    overflow: hidden;
+    white-space: nowrap;
+    text-overflow: ellipsis;
+}
+
 .chatlog__embed {
     display: flex;
     margin-top: 0.3em;

DiscordChatExporter.Core/Exporting/Writers/Html/Dark.css

@@ -46,6 +46,26 @@ a {
     border-color: rgba(255, 255, 255, 0.1);
 }
 
+.chatlog__reference-symbol {
+    border-color: #4f545c;
+}
+
+.chatlog__reference {
+    color: #b5b6b8;
+}
+
+.chatlog__reference-link {
+    color: #b5b6b8;
+}
+
+.chatlog__reference-link:hover {
+    color: #ffffff;
+}
+
+.chatlog__reference-edited-timestamp {
+    color: rgba(255, 255, 255, 0.2);
+}
+
 .chatlog__author-name {
     color: #ffffff;
 }
@@ -62,6 +82,11 @@ a {
     background-color: rgba(249, 168, 37, 0.05);
 }
 
+.chatlog__attachment-container {
+    background-color: #2f3136;
+    border-color: #292b2f;
+}
+
 .chatlog__edited-timestamp {
     color: rgba(255, 255, 255, 0.2);
 }

DiscordChatExporter.Core/Exporting/Writers/Html/Light.css

@@ -47,6 +47,26 @@ a {
     border-color: #eceeef;
 }
 
+.chatlog__reference-symbol {
+    border-color: #c7ccd1;
+}
+
+.chatlog__reference {
+    color: #5f5f60;
+}
+
+.chatlog__reference-link {
+    color: #5f5f60;
+}
+
+.chatlog__reference-link:hover {
+    color: #2f3136;
+}
+
+.chatlog__reference-edited-timestamp {
+    color: #747f8d;
+}
+
 .chatlog__author-name {
     font-weight: 600;
     color: #2f3136;
@@ -64,6 +84,11 @@ a {
     background-color: rgba(249, 168, 37, 0.05);
 }
 
+.chatlog__attachment-container {
+    background-color: #f2f3f5;
+    border-color: #ebedef;
+}
+
 .chatlog__edited-timestamp {
     color: #747f8d;
 }

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
@@ -14,10 +14,21 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.Html
 
         public IReadOnlyList<Message> Messages { get; }
 
-        public MessageGroup(User author, DateTimeOffset timestamp, IReadOnlyList<Message> messages)
+        public MessageReference? Reference { get; }
+
+        public Message? ReferencedMessage {get; }
+
+        public MessageGroup(
+            User author,
+            DateTimeOffset timestamp,
+            MessageReference? reference,
+            Message? referencedMessage,
+            IReadOnlyList<Message> messages)
         {
             Author = author;
             Timestamp = timestamp;
+            Reference = reference;
+            ReferencedMessage = referencedMessage;
             Messages = messages;
         }
     }
@@ -25,9 +36,10 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.Html
     internal partial class MessageGroup
     {
         public static bool CanJoin(Message message1, Message message2) =>
-            string.Equals(message1.Author.Id, message2.Author.Id, StringComparison.Ordinal) &&
+            message1.Author.Id == message2.Author.Id &&
             string.Equals(message1.Author.FullName, message2.Author.FullName, StringComparison.Ordinal) &&
-            (message2.Timestamp - message1.Timestamp).Duration().TotalMinutes <= 7;
+            (message2.Timestamp - message1.Timestamp).Duration().TotalMinutes <= 7 &&
+            message2.Reference is null;
 
         public static MessageGroup Join(IReadOnlyList<Message> messages)
         {
@@ -36,6 +48,8 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.Html
             return new MessageGroup(
                 first.Author,
                 first.Timestamp,
+                first.Reference,
+                first.ReferencedMessage,
                 messages
             );
         }

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

@@ -1,7 +1,8 @@
 @using System
 @using System.Linq
 @using System.Threading.Tasks
-@inherits MiniRazor.MiniRazorTemplateBase<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);
@@ -13,15 +14,72 @@
     ValueTask<string> ResolveUrlAsync(string url) => Model.ExportContext.ResolveMediaUrlAsync(url);
 
     var userMember = Model.ExportContext.TryGetMember(Model.MessageGroup.Author.Id);
-    var userColor = Model.ExportContext.TryGetUserColor(Model.MessageGroup.Author.Id);
-    var userNick = userMember?.Nick ?? Model.MessageGroup.Author.Name;
 
-    var userColorStyle = userColor != null
+    var userColor = Model.ExportContext.TryGetUserColor(Model.MessageGroup.Author.Id);
+
+    var userColorStyle = userColor is not null
         ? $"color: rgb({userColor?.R},{userColor?.G},{userColor?.B})"
         : null;
+
+    var userNick = Model.MessageGroup.Author.IsBot
+        ? Model.MessageGroup.Author.Name
+        : userMember?.Nick ?? Model.MessageGroup.Author.Name;
+
+    var referencedUserMember = Model.MessageGroup.ReferencedMessage is not null
+        ? Model.ExportContext.TryGetMember(Model.MessageGroup.ReferencedMessage.Author.Id)
+        : null;
+
+    var referencedUserColor = Model.MessageGroup.ReferencedMessage is not null
+        ? Model.ExportContext.TryGetUserColor(Model.MessageGroup.ReferencedMessage.Author.Id)
+        : null;
+
+    var referencedUserColorStyle = referencedUserColor is not null
+        ? $"color: rgb({referencedUserColor?.R},{referencedUserColor?.G},{referencedUserColor?.B})"
+        : 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
+        : null;
 }
 
 <div class="chatlog__message-group">
+    @if (Model.MessageGroup.Reference is not null)
+    {
+        <div class="chatlog__reference-symbol">
+        </div>
+        <div class="chatlog__reference">
+            @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>
+                <a class="chatlog__reference-link" href="#" onclick="scrollToMessage(event, '@Model.MessageGroup.ReferencedMessage.Id')">
+                    <span class="chatlog__reference-content">
+                        @if (!string.IsNullOrWhiteSpace(Model.MessageGroup.ReferencedMessage.Content))
+                        {
+                            @Raw(FormatMarkdown(Model.MessageGroup.ReferencedMessage.Content))
+                        }
+                        else
+                        {
+                            <em>Click to see original message</em>
+                        }
+                    </span>
+
+                    @if (Model.MessageGroup.ReferencedMessage.EditedTimestamp is not null)
+                    {
+                        <span class="chatlog__reference-edited-timestamp" title="@FormatDate(Model.MessageGroup.ReferencedMessage.EditedTimestamp.Value)">(edited)</span>
+                    }
+                </a>
+            }
+            else
+            {
+                <span class="chatlog__reference-unknown">
+                    Original message was deleted.
+                </span>
+            }
+        </div>
+    }
     <div class="chatlog__author-avatar-container">
         <img class="chatlog__author-avatar" src="@await ResolveUrlAsync(Model.MessageGroup.Author.AvatarUrl)" alt="Avatar">
     </div>
@@ -40,43 +98,71 @@
             var isPinnedStyle = message.IsPinned ? "chatlog__message--pinned" : null;
 
             <div class="chatlog__message @isPinnedStyle" data-message-id="@message.Id" id="message-@message.Id">
-                <div class="chatlog__content">
+                @if (!string.IsNullOrWhiteSpace(message.Content) || message.EditedTimestamp is not null)
-                    <div class="markdown">@Raw(FormatMarkdown(message.Content)) @if (message.EditedTimestamp != null) {<span class="chatlog__edited-timestamp" title="@FormatDate(message.EditedTimestamp.Value)">(edited)</span>}</div>
+                {
-                </div>
+                    <div class="chatlog__content">
+                        <div class="markdown">
+                            <span class="preserve-whitespace">@Raw(FormatMarkdown(message.Content))</span>
+
+                            @if (message.EditedTimestamp is not null)
+                            {
+                                <span class="chatlog__edited-timestamp" title="@FormatDate(message.EditedTimestamp.Value)">(edited)</span>
+                            }
+                        </div>
+                    </div>
+                }
 
                 @foreach (var attachment in message.Attachments)
                 {
                     <div class="chatlog__attachment">
-                        @if (attachment.IsSpoiler)
+                        <div class="@(attachment.IsSpoiler ? "spoiler spoiler--hidden" : "")" onclick="@(attachment.IsSpoiler ? "showSpoiler(event, this)" : "")">
-                        {
+                            <div class="@(attachment.IsSpoiler ? "spoiler-image" : "")">
-                            <div class="spoiler spoiler--hidden" onclick="showSpoiler(event, this)">
-                                <div class="spoiler-image">
-                                    <a href="@await ResolveUrlAsync(attachment.Url)">
-                                        <img class="chatlog__attachment-thumbnail" src="@await ResolveUrlAsync(attachment.Url)" alt="Attachment">
-                                    </a>
-                                </div>
-                            </div>
-                        }
-                        else
-                        {
-                            <a href="@await ResolveUrlAsync(attachment.Url)">
                                 @if (attachment.IsImage)
                                 {
-                                    <img class="chatlog__attachment-thumbnail" src="@await ResolveUrlAsync(attachment.Url)" alt="Attachment">
+                                    <a href="@await ResolveUrlAsync(attachment.Url)">
+                                        <img class="chatlog__attachment-thumbnail" src="@await ResolveUrlAsync(attachment.Url)" alt="Image attachment" title="@($"Image: {attachment.FileName} ({attachment.FileSize})")">
+                                    </a>
+                                }
+                                else if (attachment.IsVideo)
+                                {
+                                    <video controls class="chatlog__attachment-thumbnail">
+                                        <source src="@await ResolveUrlAsync(attachment.Url)" alt="Video attachment" title="@($"Video: {attachment.FileName} ({attachment.FileSize})")">
+                                    </video>
+                                }
+                                else if (attachment.IsAudio)
+                                {
+                                    <audio controls class="chatlog__attachment-thumbnail">
+                                        <source src="@await ResolveUrlAsync(attachment.Url)" alt="Audio attachment" title="@($"Audio: {attachment.FileName} ({attachment.FileSize})")">
+                                    </audio>
                                 }
                                 else
                                 {
-                                    @($"Attachment: {attachment.FileName} ({attachment.FileSize})")
+                                    <div class="chatlog__attachment-container">
+                                        <svg class="chatlog__attachment-icon" viewBox="0 0 720 960">
+                                            <path class="a"/>
+                                            <path class="b"/>
+                                            <path class="c"/>
+                                            <path class="d"/>
+                                        </svg>
+                                        <div class="chatlog__attachment-filename">
+                                            <a href="@await ResolveUrlAsync(attachment.Url)">
+                                                @attachment.FileName
+                                            </a>
+                                        </div>
+                                        <div class="chatlog__attachment-filesize">
+                                            @attachment.FileSize
+                                        </div>
+                                    </div>
                                 }
-                            </a>
+                            </div>
-                        }
+                        </div>
                     </div>
                 }
 
                 @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>
@@ -89,7 +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))
@@ -119,12 +205,12 @@
                                             @if (!string.IsNullOrWhiteSpace(embed.Url))
                                             {
                                                 <a class="chatlog__embed-title-link" href="@embed.Url">
-                                                    <div class="markdown">@Raw(FormatEmbedMarkdown(embed.Title))</div>
+                                                    <div class="markdown preserve-whitespace">@Raw(FormatEmbedMarkdown(embed.Title))</div>
                                                 </a>
                                             }
                                             else
                                             {
-                                                <div class="markdown">@Raw(FormatEmbedMarkdown(embed.Title))</div>
+                                                <div class="markdown preserve-whitespace">@Raw(FormatEmbedMarkdown(embed.Title))</div>
                                             }
                                         </div>
                                     }
@@ -132,7 +218,7 @@
                                     @if (!string.IsNullOrWhiteSpace(embed.Description))
                                     {
                                         <div class="chatlog__embed-description">
-                                            <div class="markdown">@Raw(FormatEmbedMarkdown(embed.Description))</div>
+                                            <div class="markdown preserve-whitespace">@Raw(FormatEmbedMarkdown(embed.Description))</div>
                                         </div>
                                     }
 
@@ -147,14 +233,14 @@
                                                     @if (!string.IsNullOrWhiteSpace(field.Name))
                                                     {
                                                         <div class="chatlog__embed-field-name">
-                                                            <div class="markdown">@Raw(FormatEmbedMarkdown(field.Name))</div>
+                                                            <div class="markdown preserve-whitespace">@Raw(FormatEmbedMarkdown(field.Name))</div>
                                                         </div>
                                                     }
 
                                                     @if (!string.IsNullOrWhiteSpace(field.Value))
                                                     {
                                                         <div class="chatlog__embed-field-value">
-                                                            <div class="markdown">@Raw(FormatEmbedMarkdown(field.Value))</div>
+                                                            <div class="markdown preserve-whitespace">@Raw(FormatEmbedMarkdown(field.Value))</div>
                                                         </div>
                                                     }
                                                 </div>
@@ -163,7 +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)">
@@ -173,7 +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)">
@@ -182,7 +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))
@@ -190,22 +276,22 @@
                                         <img class="chatlog__embed-footer-icon" src="@await ResolveUrlAsync(embed.Footer.IconUrl)" alt="Footer icon">
                                     }
 
-                                        <span class="chatlog__embed-footer-text">
+                                    <span class="chatlog__embed-footer-text">
-                                            @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text))
+                                        @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text))
-                                            {
+                                        {
-                                                @embed.Footer.Text
+                                            @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)
+                                            @FormatDate(embed.Timestamp.Value)
-                                            }
+                                        }
-                                        </span>
+                                    </span>
                                 </div>
                             }
                         </div>

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

@@ -1,14 +1,15 @@
 @using System
 @using System.Threading.Tasks
 @using Tyrrrz.Extensions
-@inherits MiniRazor.MiniRazorTemplateBase<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>
@@ -77,20 +78,20 @@
             <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)
             {
-                @($"Between {FormatDate(Model.ExportContext.Request.After.Value)} and {FormatDate(Model.ExportContext.Request.Before.Value)}")
+                @($"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)
             {
-                @($"After {FormatDate(Model.ExportContext.Request.After.Value)}")
+                @($"After {FormatDate(Model.ExportContext.Request.After.Value.ToDate())}")
             }
-            else if (Model.ExportContext.Request.Before != null)
+            else if (Model.ExportContext.Request.Before is not null)
             {
-                @($"Before {FormatDate(Model.ExportContext.Request.Before.Value)}")
+                @($"Before {FormatDate(Model.ExportContext.Request.Before.Value.ToDate())}")
             }
             </div>
         }

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

@@ -2,19 +2,17 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exporting.Writers.Html;
+using DiscordChatExporter.Core.Exporting.Writers.Html;
 
-namespace DiscordChatExporter.Domain.Exporting.Writers
+namespace DiscordChatExporter.Core.Exporting.Writers
 {
     internal class HtmlMessageWriter : MessageWriter
     {
         private readonly TextWriter _writer;
         private readonly string _themeName;
 
-        private readonly List<Message> _messageGroupBuffer = new List<Message>();
+        private readonly List<Message> _messageGroupBuffer = new();
-
-        private long _messageCount;
 
         public HtmlMessageWriter(Stream stream, ExportContext context, string themeName)
             : base(stream, context)
@@ -25,26 +23,26 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WritePreambleAsync()
         {
-            var templateContext = new LayoutTemplateContext(Context, _themeName, _messageCount);
+            var templateContext = new PreambleTemplateContext(Context, _themeName);
-            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await templateBundle.PreambleTemplate.RenderAsync(templateContext)
+                await PreambleTemplate.RenderAsync(templateContext)
             );
         }
 
         private async ValueTask WriteMessageGroupAsync(MessageGroup messageGroup)
         {
             var templateContext = new MessageGroupTemplateContext(Context, messageGroup);
-            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await templateBundle.MessageGroupTemplate.RenderAsync(templateContext)
+                await MessageGroupTemplate.RenderAsync(templateContext)
             );
         }
 
         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))
             {
@@ -58,9 +56,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
                 _messageGroupBuffer.Clear();
                 _messageGroupBuffer.Add(message);
             }
-
-            // Increment message count
-            _messageCount++;
         }
 
         public override async ValueTask WritePostambleAsync()
@@ -69,11 +64,10 @@ 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);
-            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await templateBundle.PostambleTemplate.RenderAsync(templateContext)
+                await PostambleTemplate.RenderAsync(templateContext)
             );
         }
 

DiscordChatExporter.Core/Exporting/Writers/JsonMessageWriter.cs

@@ -1,24 +1,26 @@
 using System.IO;
+using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Threading.Tasks;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
+using DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors;
-using DiscordChatExporter.Domain.Internal.Extensions;
+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
             {
-                Indented = true
+                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
+                Indented = true,
+                SkipValidation = true
             });
         }
 
@@ -29,7 +31,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
         {
             _writer.WriteStartObject();
 
-            _writer.WriteString("id", attachment.Id);
+            _writer.WriteString("id", attachment.Id.ToString());
             _writer.WriteString("url", await Context.ResolveMediaUrlAsync(attachment.Url));
             _writer.WriteString("fileName", attachment.FileName);
             _writer.WriteNumber("fileSizeBytes", attachment.FileSize.TotalBytes);
@@ -114,16 +116,19 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             _writer.WriteString("timestamp", embed.Timestamp);
             _writer.WriteString("description", FormatMarkdown(embed.Description));
 
-            if (embed.Author != null)
+            if (embed.Color is not null)
+                _writer.WriteString("color", embed.Color.Value.ToHex());
+
+            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
@@ -156,6 +161,20 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             await _writer.FlushAsync();
         }
 
+        private async ValueTask WriteMentionAsync(User mentionedUser)
+        {
+            _writer.WriteStartObject();
+
+            _writer.WriteString("id", mentionedUser.Id.ToString());
+            _writer.WriteString("name", mentionedUser.Name);
+            _writer.WriteString("discriminator", mentionedUser.DiscriminatorFormatted);
+            _writer.WriteString("nickname", Context.TryGetMember(mentionedUser.Id)?.Nick ?? mentionedUser.Name);
+            _writer.WriteBoolean("isBot", mentionedUser.IsBot);
+
+            _writer.WriteEndObject();
+            await _writer.FlushAsync();
+        }
+
         public override async ValueTask WritePreambleAsync()
         {
             // Root object (start)
@@ -163,24 +182,25 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             // Guild
             _writer.WriteStartObject("guild");
-            _writer.WriteString("id", Context.Request.Guild.Id);
+            _writer.WriteString("id", Context.Request.Guild.Id.ToString());
             _writer.WriteString("name", Context.Request.Guild.Name);
             _writer.WriteString("iconUrl", await Context.ResolveMediaUrlAsync(Context.Request.Guild.IconUrl));
             _writer.WriteEndObject();
 
             // Channel
             _writer.WriteStartObject("channel");
-            _writer.WriteString("id", Context.Request.Channel.Id);
+            _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();
 
             // Date range
             _writer.WriteStartObject("dateRange");
-            _writer.WriteString("after", Context.Request.After);
+            _writer.WriteString("after", Context.Request.After?.ToDate());
-            _writer.WriteString("before", Context.Request.Before);
+            _writer.WriteString("before", Context.Request.Before?.ToDate());
             _writer.WriteEndObject();
 
             // Message array (start)
@@ -190,13 +210,16 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
         public override async ValueTask WriteMessageAsync(Message message)
         {
+            await base.WriteMessageAsync(message);
+
             _writer.WriteStartObject();
 
             // Metadata
-            _writer.WriteString("id", message.Id);
+            _writer.WriteString("id", message.Id.ToString());
             _writer.WriteString("type", message.Type.ToString());
             _writer.WriteString("timestamp", message.Timestamp);
             _writer.WriteString("timestampEdited", message.EditedTimestamp);
+            _writer.WriteString("callEndedTimestamp", message.CallEndedTimestamp);
             _writer.WriteBoolean("isPinned", message.IsPinned);
 
             // Content
@@ -204,9 +227,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             // Author
             _writer.WriteStartObject("author");
-            _writer.WriteString("id", message.Author.Id);
+            _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();
@@ -235,10 +260,26 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
 
             _writer.WriteEndArray();
 
+            // Mentions
+            _writer.WriteStartArray("mentions");
+
+            foreach (var mention in message.MentionedUsers)
+                await WriteMentionAsync(mention);
+
+            _writer.WriteEndArray();
+
+            // Message reference
+            if (message.Reference is not null)
+            {
+                _writer.WriteStartObject("reference");
+                _writer.WriteString("messageId", message.Reference.MessageId?.ToString());
+                _writer.WriteString("channelId", message.Reference.ChannelId?.ToString());
+                _writer.WriteString("guildId", message.Reference.GuildId?.ToString());
+                _writer.WriteEndObject();
+            }
+
             _writer.WriteEndObject();
             await _writer.FlushAsync();
-
-            _messageCount++;
         }
 
         public override async ValueTask WritePostambleAsync()
@@ -246,7 +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();
@@ -259,4 +300,4 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
             await base.DisposeAsync();
         }
     }
-}
+}

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

@@ -3,11 +3,13 @@ using System.Linq;
 using System.Net;
 using System.Text;
 using System.Text.RegularExpressions;
-using DiscordChatExporter.Domain.Discord.Models;
+using DiscordChatExporter.Core.Discord;
-using DiscordChatExporter.Domain.Markdown;
+using DiscordChatExporter.Core.Discord.Data;
-using DiscordChatExporter.Domain.Markdown.Ast;
+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
     {
@@ -75,6 +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
@@ -84,7 +87,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.User)
             {
-                var member = _context.TryGetMember(mention.Id);
+                var member = mentionId?.Pipe(_context.TryGetMember);
                 var fullName = member?.User.FullName ?? "Unknown";
                 var nick = member?.Nick ?? "Unknown";
 
@@ -95,7 +98,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.Channel)
             {
-                var channel = _context.TryGetChannel(mention.Id);
+                var channel = mentionId?.Pipe(_context.TryGetChannel);
                 var name = channel?.Name ?? "deleted-channel";
 
                 _buffer
@@ -105,11 +108,11 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors
             }
             else if (mention.Type == MentionType.Role)
             {
-                var role = _context.TryGetRole(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

@@ -1,8 +1,10 @@
 using System.Text;
-using DiscordChatExporter.Domain.Markdown;
+using DiscordChatExporter.Core.Discord;
-using DiscordChatExporter.Domain.Markdown.Ast;
+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
     {
@@ -23,27 +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(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(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(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.Core.Discord.Data;
-using DiscordChatExporter.Domain.Exporting.Writers.MarkdownVisitors;
+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)
         {
@@ -113,16 +111,16 @@ 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($"After: {Context.FormatDate(Context.Request.After.Value)}");
+                await _writer.WriteLineAsync($"After: {Context.FormatDate(Context.Request.After.Value.ToDate())}");
 
-            if (Context.Request.Before != null)
+            if (Context.Request.Before is not null)
-                await _writer.WriteLineAsync($"Before: {Context.FormatDate(Context.Request.Before.Value)}");
+                await _writer.WriteLineAsync($"Before: {Context.FormatDate(Context.Request.Before.Value.ToDate())}");
 
             await _writer.WriteLineAsync('='.Repeat(62));
             await _writer.WriteLineAsync();
@@ -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

@@ -1,82 +1,100 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
-using DiscordChatExporter.Domain.Markdown.Ast;
+using DiscordChatExporter.Core.Markdown.Ast;
-using DiscordChatExporter.Domain.Markdown.Matching;
+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
     {
-        private const RegexOptions DefaultRegexOptions = RegexOptions.Compiled | RegexOptions.CultureInvariant | RegexOptions.Multiline;
+        private const RegexOptions DefaultRegexOptions =
+            RegexOptions.Compiled |
+            RegexOptions.CultureInvariant |
+            RegexOptions.Multiline;
 
         /* Formatting */
 
         // Capture any character until the earliest double asterisk not followed by an asterisk
         private static readonly IMatcher<MarkdownNode> BoldFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\*\\*(.+?)\\*\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Bold, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Bold, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Capture any character until the earliest single asterisk not preceded or followed by an asterisk
         // Opening asterisk must not be followed by whitespace
         // Closing asterisk must not be preceded by whitespace
         private static readonly IMatcher<MarkdownNode> ItalicFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\*(?!\\s)(.+?)(?<!\\s|\\*)\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Capture any character until the earliest triple asterisk not followed by an asterisk
         private static readonly IMatcher<MarkdownNode> ItalicBoldFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\*(\\*\\*.+?\\*\\*)\\*(?!\\*)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), BoldFormattedNodeMatcher)));
+            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), BoldFormattedNodeMatcher))
+        );
 
         // Capture any character except underscore until an underscore
         // Closing underscore must not be followed by a word character
         private static readonly IMatcher<MarkdownNode> ItalicAltFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("_([^_]+)_(?!\\w)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Capture any character until the earliest double underscore not followed by an underscore
         private static readonly IMatcher<MarkdownNode> UnderlineFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("__(.+?)__(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Underline, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Underline, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Capture any character until the earliest triple underscore not followed by an underscore
-        private static readonly IMatcher<MarkdownNode> ItalicUnderlineFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
+        private static readonly IMatcher<MarkdownNode> ItalicUnderlineFormattedNodeMatcher =
-            new Regex("_(__.+?__)_(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
+            new RegexMatcher<MarkdownNode>(
-            (p, m) => new FormattedNode(TextFormatting.Italic, Parse(p.Slice(m.Groups[1]), UnderlineFormattedNodeMatcher)));
+                new Regex("_(__.+?__)_(?!_)", DefaultRegexOptions | RegexOptions.Singleline),
+                (p, m) => new FormattedNode(TextFormatting.Italic,
+                    Parse(p.Slice(m.Groups[1]), UnderlineFormattedNodeMatcher))
+            );
 
         // Capture any character until the earliest double tilde
-        private static readonly IMatcher<MarkdownNode> StrikethroughFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
+        private static readonly IMatcher<MarkdownNode> StrikethroughFormattedNodeMatcher =
-            new Regex("~~(.+?)~~", DefaultRegexOptions | RegexOptions.Singleline),
+            new RegexMatcher<MarkdownNode>(
-            (p, m) => new FormattedNode(TextFormatting.Strikethrough, Parse(p.Slice(m.Groups[1]))));
+                new Regex("~~(.+?)~~", DefaultRegexOptions | RegexOptions.Singleline),
+                (p, m) => new FormattedNode(TextFormatting.Strikethrough, Parse(p.Slice(m.Groups[1])))
+            );
 
         // Capture any character until the earliest double pipe
         private static readonly IMatcher<MarkdownNode> SpoilerFormattedNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\|\\|(.+?)\\|\\|", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Spoiler, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Spoiler, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Capture any character until the end of the line
         // Opening 'greater than' character must be followed by whitespace
         private static readonly IMatcher<MarkdownNode> SingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("^>\\s(.+\n?)", DefaultRegexOptions),
-            (p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1])))
+        );
 
         // Repeatedly capture any character until the end of the line
         // This one is tricky as it ends up producing multiple separate captures which need to be joined
-        private static readonly IMatcher<MarkdownNode> RepeatedSingleLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
+        private static readonly IMatcher<MarkdownNode> RepeatedSingleLineQuoteNodeMatcher =
-            new Regex("(?:^>\\s(.+\n?)){2,}", DefaultRegexOptions),
+            new RegexMatcher<MarkdownNode>(
-            (p, m) =>
+                new Regex("(?:^>\\s(.+\n?)){2,}", DefaultRegexOptions),
-            {
+                (_, m) =>
-                var content = string.Concat(m.Groups[1].Captures.Select(c => c.Value));
+                {
-                return new FormattedNode(TextFormatting.Quote, Parse(content));
+                    var content = string.Concat(m.Groups[1].Captures.Select(c => c.Value));
-            });
+                    return new FormattedNode(TextFormatting.Quote, Parse(content));
+                }
+            );
 
         // Capture any character until the end of the input
         // Opening 'greater than' characters must be followed by whitespace
         private static readonly IMatcher<MarkdownNode> MultiLineQuoteNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("^>>>\\s(.+)", DefaultRegexOptions | RegexOptions.Singleline),
-            (p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1]))));
+            (p, m) => new FormattedNode(TextFormatting.Quote, Parse(p.Slice(m.Groups[1])))
+        );
 
         /* Code blocks */
 
@@ -85,41 +103,48 @@ namespace DiscordChatExporter.Domain.Markdown
         // There can be either one or two backticks, but equal number on both sides
         private static readonly IMatcher<MarkdownNode> InlineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("(`{1,2})([^`]+)\\1", DefaultRegexOptions | RegexOptions.Singleline),
-            m => new InlineCodeBlockNode(m.Groups[2].Value.Trim('\r', '\n')));
+            m => new InlineCodeBlockNode(m.Groups[2].Value.Trim('\r', '\n'))
+        );
 
         // Capture language identifier and then any character until the earliest triple backtick
         // Language identifier is one word immediately after opening backticks, followed immediately by newline
         // Blank lines at the beginning and end of content are trimmed
         private static readonly IMatcher<MarkdownNode> MultiLineCodeBlockNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("```(?:(\\w*)\\n)?(.+?)```", DefaultRegexOptions | RegexOptions.Singleline),
-            m => new MultiLineCodeBlockNode(m.Groups[1].Value, m.Groups[2].Value.Trim('\r', '\n')));
+            m => new MultiLineCodeBlockNode(m.Groups[1].Value, m.Groups[2].Value.Trim('\r', '\n'))
+        );
 
         /* Mentions */
 
         // Capture @everyone
         private static readonly IMatcher<MarkdownNode> EveryoneMentionNodeMatcher = new StringMatcher<MarkdownNode>(
             "@everyone",
-            p => new MentionNode("everyone", MentionType.Meta));
+            _ => new MentionNode("everyone", MentionType.Meta)
+        );
 
         // Capture @here
         private static readonly IMatcher<MarkdownNode> HereMentionNodeMatcher = new StringMatcher<MarkdownNode>(
             "@here",
-            p => new MentionNode("here", MentionType.Meta));
+            _ => new MentionNode("here", MentionType.Meta)
+        );
 
         // Capture <@123456> or <@!123456>
         private static readonly IMatcher<MarkdownNode> UserMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("<@!?(\\d+)>", DefaultRegexOptions),
-            m => new MentionNode(m.Groups[1].Value, MentionType.User));
+            m => new MentionNode(m.Groups[1].Value, MentionType.User)
+        );
 
         // Capture <#123456>
         private static readonly IMatcher<MarkdownNode> ChannelMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("<#(\\d+)>", DefaultRegexOptions),
-            m => new MentionNode(m.Groups[1].Value, MentionType.Channel));
+            m => new MentionNode(m.Groups[1].Value, MentionType.Channel)
+        );
 
         // Capture <@&123456>
         private static readonly IMatcher<MarkdownNode> RoleMentionNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("<@&(\\d+)>", DefaultRegexOptions),
-            m => new MentionNode(m.Groups[1].Value, MentionType.Role));
+            m => new MentionNode(m.Groups[1].Value, MentionType.Role)
+        );
 
         /* Emojis */
 
@@ -129,30 +154,36 @@ namespace DiscordChatExporter.Domain.Markdown
         // ... or digit followed by enclosing mark
         // (this does not match all emojis in Discord but it's reasonably accurate enough)
         private static readonly IMatcher<MarkdownNode> StandardEmojiNodeMatcher = new RegexMatcher<MarkdownNode>(
-            new Regex("((?:[\\uD83C][\\uDDE6-\\uDDFF]){2}|[\\u2600-\\u26FF]|\\p{Cs}{2}|\\d\\p{Me})", DefaultRegexOptions),
+            new Regex("((?:[\\uD83C][\\uDDE6-\\uDDFF]){2}|[\\u2600-\\u26FF]|\\p{Cs}{2}|\\d\\p{Me})",
-            m => new EmojiNode(m.Groups[1].Value));
+                DefaultRegexOptions),
+            m => new EmojiNode(m.Groups[1].Value)
+        );
 
         // Capture <:lul:123456> or <a:lul:123456>
         private static readonly IMatcher<MarkdownNode> CustomEmojiNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("<(a)?:(.+?):(\\d+?)>", DefaultRegexOptions),
-            m => new EmojiNode(m.Groups[3].Value, m.Groups[2].Value, !string.IsNullOrWhiteSpace(m.Groups[1].Value)));
+            m => new EmojiNode(m.Groups[3].Value, m.Groups[2].Value, !string.IsNullOrWhiteSpace(m.Groups[1].Value))
+        );
 
         /* Links */
 
         // Capture [title](link)
         private static readonly IMatcher<MarkdownNode> TitledLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\[(.+?)\\]\\((.+?)\\)", DefaultRegexOptions),
-            m => new LinkNode(m.Groups[2].Value, m.Groups[1].Value));
+            m => new LinkNode(m.Groups[2].Value, m.Groups[1].Value)
+        );
 
         // Capture any non-whitespace character after http:// or https:// until the last punctuation character or whitespace
         private static readonly IMatcher<MarkdownNode> AutoLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("(https?://\\S*[^\\.,:;\"\'\\s])", DefaultRegexOptions),
-            m => new LinkNode(m.Groups[1].Value));
+            m => new LinkNode(m.Groups[1].Value)
+        );
 
         // Same as auto link but also surrounded by angular brackets
         private static readonly IMatcher<MarkdownNode> HiddenLinkNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("<(https?://\\S*[^\\.,:;\"\'\\s])>", DefaultRegexOptions),
-            m => new LinkNode(m.Groups[1].Value));
+            m => new LinkNode(m.Groups[1].Value)
+        );
 
         /* Text */
 
@@ -160,25 +191,29 @@ namespace DiscordChatExporter.Domain.Markdown
         // This escapes it from matching for formatting
         private static readonly IMatcher<MarkdownNode> ShrugTextNodeMatcher = new StringMatcher<MarkdownNode>(
             @"¯\_(ツ)_/¯",
-            p => new TextNode(p.ToString()));
+            p => new TextNode(p.ToString())
+        );
 
         // Capture some specific emojis that don't get rendered
         // This escapes it from matching for emoji
         private static readonly IMatcher<MarkdownNode> IgnoredEmojiTextNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("(\\u26A7|\\u2640|\\u2642|\\u2695|\\u267E|\\u00A9|\\u00AE|\\u2122)", DefaultRegexOptions),
-            m => new TextNode(m.Groups[1].Value));
+            m => new TextNode(m.Groups[1].Value)
+        );
 
         // Capture any "symbol/other" character or surrogate pair preceded by a backslash
         // This escapes it from matching for emoji
         private static readonly IMatcher<MarkdownNode> EscapedSymbolTextNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\\\(\\p{So}|\\p{Cs}{2})", DefaultRegexOptions),
-            m => new TextNode(m.Groups[1].Value));
+            m => new TextNode(m.Groups[1].Value)
+        );
 
         // Capture any non-whitespace, non latin alphanumeric character preceded by a backslash
         // This escapes it from matching for formatting or other tokens
         private static readonly IMatcher<MarkdownNode> EscapedCharacterTextNodeMatcher = new RegexMatcher<MarkdownNode>(
             new Regex("\\\\([^a-zA-Z0-9\\s])", DefaultRegexOptions),
-            m => new TextNode(m.Groups[1].Value));
+            m => new TextNode(m.Groups[1].Value)
+        );
 
         // Combine all matchers into one
         // Matchers that have similar patterns are ordered from most specific to least specific

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
     {
@@ -25,7 +25,7 @@ namespace DiscordChatExporter.Domain.Markdown.Matching
         {
         }
 
-        public StringPart Slice(int newStartIndex, int newLength) => new StringPart(Target, newStartIndex, newLength);
+        public StringPart Slice(int newStartIndex, int newLength) => new(Target, newStartIndex, newLength);
 
         public StringPart Slice(int newStartIndex) => Slice(newStartIndex, EndIndex - newStartIndex);
 

DiscordChatExporter.Core/Utils/Extensions/AsyncExtensions.cs

@@ -5,11 +5,12 @@ using System.Runtime.CompilerServices;
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace DiscordChatExporter.Domain.Utilities
+namespace DiscordChatExporter.Core.Utils.Extensions
 {
     public static class AsyncExtensions
     {
-        private static async ValueTask<IReadOnlyList<T>> AggregateAsync<T>(this IAsyncEnumerable<T> asyncEnumerable)
+        private static async ValueTask<IReadOnlyList<T>> AggregateAsync<T>(
+            this IAsyncEnumerable<T> asyncEnumerable)
         {
             var list = new List<T>();
 
@@ -19,10 +20,14 @@ namespace DiscordChatExporter.Domain.Utilities
             return list;
         }
 
-        public static ValueTaskAwaiter<IReadOnlyList<T>> GetAwaiter<T>(this IAsyncEnumerable<T> asyncEnumerable) =>
+        public static ValueTaskAwaiter<IReadOnlyList<T>> GetAwaiter<T>(
+            this IAsyncEnumerable<T> asyncEnumerable) =>
             asyncEnumerable.AggregateAsync().GetAwaiter();
 
-        public static async ValueTask ParallelForEachAsync<T>(this IEnumerable<T> source, Func<T, Task> handleAsync, int degreeOfParallelism)
+        public static async ValueTask ParallelForEachAsync<T>(
+            this IEnumerable<T> source,
+            Func<T, ValueTask> handleAsync,
+            int degreeOfParallelism)
         {
             using var semaphore = new SemaphoreSlim(degreeOfParallelism);
 

DiscordChatExporter.Core/Utils/Extensions/BinaryExtensions.cs

@@ -0,0 +1,19 @@
+using System.Text;
+
+namespace DiscordChatExporter.Core.Utils.Extensions
+{
+    public static class BinaryExtensions
+    {
+        public static string ToHex(this byte[] data)
+        {
+            var buffer = new StringBuilder();
+
+            foreach (var t in data)
+            {
+                buffer.Append(t.ToString("X2"));
+            }
+
+            return buffer.ToString();
+        }
+    }
+}

DiscordChatExporter.Core/Utils/Extensions/ColorExtensions.cs

@@ -1,13 +1,15 @@
 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);
 
         public static Color ResetAlpha(this Color color) => color.WithAlpha(255);
 
         public static int ToRgb(this Color color) => color.ToArgb() & 0xffffff;
+
+        public static string ToHex(this Color color) => $"#{color.R:X2}{color.G:X2}{color.B:X2}";
     }
 }

DiscordChatExporter.Core/Utils/Extensions/DateExtensions.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Globalization;
+
+namespace DiscordChatExporter.Core.Utils.Extensions
+{
+    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

@@ -1,8 +1,8 @@
 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);