Switch from RazorLight to MiniRazor

DiscordChatExporter.Domain/DiscordChatExporter.Domain.csproj

@@ -2,8 +2,8 @@
   <Import Project="../DiscordChatExporter.props" />
 
   <ItemGroup>
+    <PackageReference Include="MiniRazor" Version="1.0.1" />
     <PackageReference Include="Polly" Version="7.2.1" />
-    <PackageReference Include="RazorLight" Version="2.0.0-beta9" />
     <PackageReference Include="Tyrrrz.Extensions" Version="1.6.5" />
   </ItemGroup>
 
@@ -11,9 +11,9 @@
     <EmbeddedResource Include="Exporting\Writers\Html\Core.css" />
     <EmbeddedResource Include="Exporting\Writers\Html\Dark.css" />
     <EmbeddedResource Include="Exporting\Writers\Html\Light.css" />
-    <EmbeddedResource Include="Exporting\Writers\Html\LayoutTemplate-End.cshtml" />
-    <EmbeddedResource Include="Exporting\Writers\Html\LayoutTemplate-Begin.cshtml" />
+    <EmbeddedResource Include="Exporting\Writers\Html\PreambleTemplate.cshtml" />
+    <EmbeddedResource Include="Exporting\Writers\Html\PostambleTemplate.cshtml" />
     <EmbeddedResource Include="Exporting\Writers\Html\MessageGroupTemplate.cshtml" />
   </ItemGroup>
 
-</Project>
+</Project>

DiscordChatExporter.Domain/Exporting/ExportContext.cs

@@ -3,7 +3,6 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.IO;
 using System.Linq;
-using System.Net;
 using System.Net.Http;
 using System.Threading.Tasks;
 using DiscordChatExporter.Domain.Discord.Models;
@@ -12,7 +11,7 @@ using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Domain.Exporting
 {
-    public class ExportContext
+    internal class ExportContext
     {
         private readonly MediaDownloader _mediaDownloader;
 

DiscordChatExporter.Domain/Exporting/Writers/Html/LayoutTemplateContext.cs

@@ -1,6 +1,6 @@
 namespace DiscordChatExporter.Domain.Exporting.Writers.Html
 {
-    public class LayoutTemplateContext
+    internal class LayoutTemplateContext
     {
         public ExportContext ExportContext { get; }
 

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

@@ -6,7 +6,7 @@ using DiscordChatExporter.Domain.Discord.Models;
 namespace DiscordChatExporter.Domain.Exporting.Writers.Html
 {
     // Used for grouping contiguous messages in HTML export
-    public partial class MessageGroup
+    internal partial class MessageGroup
     {
         public User Author { get; }
 
@@ -22,7 +22,7 @@ namespace DiscordChatExporter.Domain.Exporting.Writers.Html
         }
     }
 
-    public partial class MessageGroup
+    internal partial class MessageGroup
     {
         public static bool CanJoin(Message message1, Message message2) =>
             string.Equals(message1.Author.Id, message2.Author.Id, StringComparison.Ordinal) &&

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

@@ -1,6 +1,7 @@
-@using RazorLight
-@using DiscordChatExporter.Domain.Exporting.Writers.Html
-@inherits TemplatePage<MessageGroupTemplateContext>
+@using System
+@using System.Linq
+@using System.Threading.Tasks
+@inherits MiniRazor.MiniRazorTemplateBase<DiscordChatExporter.Domain.Exporting.Writers.Html.MessageGroupTemplateContext>
 
 @{
     string FormatDate(DateTimeOffset date) => Model.ExportContext.FormatDate(date);

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

@@ -2,7 +2,7 @@
 
 namespace DiscordChatExporter.Domain.Exporting.Writers.Html
 {
-    public class MessageGroupTemplateContext
+    internal class MessageGroupTemplateContext
     {
         public ExportContext ExportContext { get; }
 

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

@@ -1,6 +1,4 @@
-@using RazorLight
-@using DiscordChatExporter.Domain.Exporting.Writers.Html
-@inherits TemplatePage<LayoutTemplateContext>
+@inherits MiniRazor.MiniRazorTemplateBase<DiscordChatExporter.Domain.Exporting.Writers.Html.LayoutTemplateContext>
 
 </div>
 

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

@@ -1,15 +1,14 @@
-@using RazorLight
-@using DiscordChatExporter.Domain.Exporting.Writers.Html
+@using System
+@using System.Threading.Tasks
 @using Tyrrrz.Extensions
-@inherits TemplatePage<LayoutTemplateContext>
+@inherits MiniRazor.MiniRazorTemplateBase<DiscordChatExporter.Domain.Exporting.Writers.Html.LayoutTemplateContext>
 
 @{
     string FormatDate(DateTimeOffset date) => Model.ExportContext.FormatDate(date);
 
     ValueTask<string> ResolveUrlAsync(string url) => Model.ExportContext.ResolveMediaUrlAsync(url);
 
-    // Workaround: https://github.com/toddams/RazorLight/issues/359
-    string RenderStyleSheet(string name) => Model.GetType().Assembly.GetManifestResourceString($"DiscordChatExporter.Domain.Exporting.Writers.Html.{name}.css");
+    string GetStyleSheet(string name) => Model.GetType().Assembly.GetManifestResourceString($"DiscordChatExporter.Domain.Exporting.Writers.Html.{name}.css");
 }
 
 <!DOCTYPE html>
@@ -21,10 +20,10 @@
     <meta name="viewport" content="width=device-width">
 
     <style>
-        @Raw(RenderStyleSheet("Core"))
+        @Raw(GetStyleSheet("Core"))
     </style>
     <style>
-        @Raw(RenderStyleSheet(Model.ThemeName))
+        @Raw(GetStyleSheet(Model.ThemeName))
     </style>
 
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/solarized-@(Model.ThemeName.ToLowerInvariant()).min.css">

DiscordChatExporter.Domain/Exporting/Writers/Html/TemplateBundle.cs

@@ -0,0 +1,59 @@
+using System.Runtime.CompilerServices;
+using System.Threading.Tasks;
+using MiniRazor;
+using Tyrrrz.Extensions;
+
+[assembly: InternalsVisibleTo("RazorAssembly")]
+
+namespace DiscordChatExporter.Domain.Exporting.Writers.Html
+{
+    internal partial class TemplateBundle
+    {
+        public MiniRazorTemplateDescriptor PreambleTemplate { get; }
+
+        public MiniRazorTemplateDescriptor MessageGroupTemplate { get; }
+
+        public MiniRazorTemplateDescriptor PostambleTemplate { get; }
+
+        public TemplateBundle(
+            MiniRazorTemplateDescriptor preambleTemplate,
+            MiniRazorTemplateDescriptor messageGroupTemplate,
+            MiniRazorTemplateDescriptor postambleTemplate)
+        {
+            PreambleTemplate = preambleTemplate;
+            MessageGroupTemplate = messageGroupTemplate;
+            PostambleTemplate = postambleTemplate;
+        }
+    }
+
+    internal partial class TemplateBundle
+    {
+        private static TemplateBundle? _lastBundle;
+
+        // This is very CPU-heavy
+        private static async ValueTask<TemplateBundle> CompileAsync() => await Task.Run(() =>
+        {
+            var ns = typeof(TemplateBundle).Namespace!;
+
+            var preambleTemplateSource = typeof(HtmlMessageWriter).Assembly
+                .GetManifestResourceString($"{ns}.PreambleTemplate.cshtml");
+
+            var messageGroupTemplateSource = typeof(HtmlMessageWriter).Assembly
+                .GetManifestResourceString($"{ns}.MessageGroupTemplate.cshtml");
+
+            var postambleTemplateSource = typeof(HtmlMessageWriter).Assembly
+                .GetManifestResourceString($"{ns}.PostambleTemplate.cshtml");
+
+            var engine = new MiniRazorTemplateEngine("RazorAssembly", ns);
+
+            var preambleTemplate = engine.Compile(preambleTemplateSource);
+            var messageGroupTemplate = engine.Compile(messageGroupTemplateSource);
+            var postambleTemplate = engine.Compile(postambleTemplateSource);
+
+            return new TemplateBundle(preambleTemplate, messageGroupTemplate, postambleTemplate);
+        });
+
+        public static async ValueTask<TemplateBundle> ResolveAsync() =>
+            _lastBundle ??= await CompileAsync();
+    }
+}

DiscordChatExporter.Domain/Exporting/Writers/HtmlMessageWriter.cs

@@ -4,7 +4,6 @@ using System.Linq;
 using System.Threading.Tasks;
 using DiscordChatExporter.Domain.Discord.Models;
 using DiscordChatExporter.Domain.Exporting.Writers.Html;
-using RazorLight;
 
 namespace DiscordChatExporter.Domain.Exporting.Writers
 {
@@ -13,7 +12,6 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
         private readonly TextWriter _writer;
         private readonly string _themeName;
 
-        private readonly RazorLightEngine _templateEngine;
         private readonly List<Message> _messageGroupBuffer = new List<Message>();
 
         private long _messageCount;
@@ -23,28 +21,25 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
         {
             _writer = new StreamWriter(stream);
             _themeName = themeName;
-
-            _templateEngine = new RazorLightEngineBuilder()
-                .EnableEncoding()
-                .UseEmbeddedResourcesProject(typeof(HtmlMessageWriter).Assembly, $"{typeof(HtmlMessageWriter).Namespace}.Html")
-                .Build();
         }
 
         public override async ValueTask WritePreambleAsync()
         {
             var templateContext = new LayoutTemplateContext(Context, _themeName, _messageCount);
+            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await _templateEngine.CompileRenderAsync("LayoutTemplate-Begin.cshtml", templateContext)
+                await templateBundle.PreambleTemplate.RenderAsync(templateContext)
             );
         }
 
         private async ValueTask WriteMessageGroupAsync(MessageGroup messageGroup)
         {
             var templateContext = new MessageGroupTemplateContext(Context, messageGroup);
+            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await _templateEngine.CompileRenderAsync("MessageGroupTemplate.cshtml", templateContext)
+                await templateBundle.MessageGroupTemplate.RenderAsync(templateContext)
             );
         }
 
@@ -75,9 +70,10 @@ namespace DiscordChatExporter.Domain.Exporting.Writers
                 await WriteMessageGroupAsync(MessageGroup.Join(_messageGroupBuffer));
 
             var templateContext = new LayoutTemplateContext(Context, _themeName, _messageCount);
+            var templateBundle = await TemplateBundle.ResolveAsync();
 
             await _writer.WriteLineAsync(
-                await _templateEngine.CompileRenderAsync("LayoutTemplate-End.cshtml", templateContext)
+                await templateBundle.PostambleTemplate.RenderAsync(templateContext)
             );
         }
 

DiscordChatExporter.props

@@ -7,7 +7,6 @@
     <Copyright>Copyright (c) Alexey Golub</Copyright>
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
-    <PreserveCompilationContext>true</PreserveCompilationContext>
   </PropertyGroup>
 
 </Project>