fix: styles of title and subtitles.

YaeBlog.Core/Services/RendererService.cs

@@ -1,6 +1,7 @@
 using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Text;
+using System.Text.RegularExpressions;
 using Markdig;
 using Microsoft.Extensions.Logging;
 using YaeBlog.Core.Abstractions;
@@ -11,7 +12,7 @@ using YamlDotNet.Serialization;
 
 namespace YaeBlog.Core.Services;
 
-public class RendererService(ILogger<RendererService> logger,
+public partial class RendererService(ILogger<RendererService> logger,
     EssayScanService essayScanService,
     MarkdownPipeline markdownPipeline,
     IDeserializer yamlDeserializer,
@@ -172,30 +173,34 @@ public class RendererService(ILogger<RendererService> logger,
         }
     }
 
+    [GeneratedRegex(@"(?<!\\)[^\#\*_\-\+\`{}\[\]!~]+")]
+    private static partial Regex DescriptionPattern();
+
     private string GetDescription(BlogContent content)
     {
         const string delimiter = "<!--more-->";
         int pos = content.FileContent.IndexOf(delimiter, StringComparison.Ordinal);
-        StringBuilder builder = new();
+        bool breakSentence = false;
 
         if (pos == -1)
         {
             // 自动截取前50个字符
             pos = content.FileContent.Length < 50 ? content.FileContent.Length : 50;
+            breakSentence = true;
         }
 
-        for (int i = 0; i < pos; i++)
+        string rawContent = content.FileContent[..pos];
+        MatchCollection matches = DescriptionPattern().Matches(rawContent);
+
+        StringBuilder builder = new();
+        foreach (Match match in matches)
         {
-            char c = content.FileContent[i];
+            builder.Append(match.Value);
+        }
 
-            if (char.IsControl(c) || char.IsSymbol(c) ||
-                char.IsSeparator(c) || char.IsPunctuation(c) ||
-                char.IsAsciiLetter(c))
-            {
-                continue;
-            }
-
-            builder.Append(c);
+        if (breakSentence)
+        {
+            builder.Append("……");
         }
 
         string description = builder.ToString();