From b1b88fc0a3464e0b58a36f6dc54d002f515d6b7c Mon Sep 17 00:00:00 2001
From: zack4485-MSFT <72422659+zack4485@users.noreply.github.com>
Date: Thu, 31 Oct 2024 02:41:23 -0400
Subject: [PATCH] Update MarkdownPagesBase.cs

Enabling anchor links
---
 MyApp/MarkdownPagesBase.cs | 38 +++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/MyApp/MarkdownPagesBase.cs b/MyApp/MarkdownPagesBase.cs
index b2926a4..ae0d4c6 100644
--- a/MyApp/MarkdownPagesBase.cs
+++ b/MyApp/MarkdownPagesBase.cs
@@ -113,12 +113,12 @@ public abstract class MarkdownPagesBase<T>(ILogger log, IWebHostEnvironment env,
     public abstract string Id { get; }
     public IVirtualFiles VirtualFiles => fs;
 
-    public virtual MarkdownPipeline CreatePipeline()
+    public virtual MarkdownPipeline CreatePipeline(string path)
     {
         var builder = new MarkdownPipelineBuilder()
             .UseYamlFrontMatter()
             .UseAdvancedExtensions()
-            .UseAutoLinkHeadings()
+            .UseAutoLinkHeadings(this, path)
             .UseHeadingsMap()
             .UseCustomContainers(MarkdigConfig.Instance.ConfigureContainers);
         MarkdigConfig.Instance.ConfigurePipeline?.Invoke(builder);
@@ -149,9 +149,9 @@ public virtual List<T> Fresh(List<T> docs)
         return doc;
     }
 
-    public virtual T CreateMarkdownFile(string content, TextWriter writer, MarkdownPipeline? pipeline = null)
+    public virtual T CreateMarkdownFile(string path, string content, TextWriter writer, MarkdownPipeline? pipeline = null)
     {
-        pipeline ??= CreatePipeline();
+        pipeline ??= CreatePipeline(path);
 
         var renderer = new Markdig.Renderers.HtmlRenderer(writer);
         pipeline.Setup(renderer);
@@ -190,7 +190,7 @@ public virtual T CreateMarkdownFile(string content, TextWriter writer, MarkdownP
 
         var writer = new StringWriter();
 
-        var doc = CreateMarkdownFile(content, writer, pipeline);
+        var doc = CreateMarkdownFile(string.Empty, content, writer, pipeline);
         doc.Title ??= file.Name;
 
         doc.Path = file.VirtualPath;
@@ -278,7 +278,7 @@ public void LoadFrom(string fromDirectory)
             .ToList();
         log.LogInformation("Found {Count} includes", files.Count);
 
-        var pipeline = CreatePipeline();
+        var pipeline = CreatePipeline(string.Empty);
 
         foreach (var file in files)
         {
@@ -322,6 +322,8 @@ public struct HeadingInfo(int level, string id, string content)
 /// <seealso cref="HtmlObjectRenderer{TObject}" />
 public class AutoLinkHeadingRenderer : HtmlObjectRenderer<HeadingBlock>
 {
+    private string _relativeHtmlPath;
+
     private static readonly string[] HeadingTexts = [
         "h1",
         "h2",
@@ -330,6 +332,11 @@ public class AutoLinkHeadingRenderer : HtmlObjectRenderer<HeadingBlock>
         "h5",
         "h6"
     ];
+    
+    public AutoLinkHeadingRenderer(string relativeHtmlPath)
+    {
+        this._relativeHtmlPath = relativeHtmlPath;
+    }
 
     public event Action<HeadingBlock>? OnHeading;
 
@@ -942,9 +949,22 @@ public static class MarkdigExtensions
     /// <summary>
     /// Uses the auto-identifier extension.
     /// </summary>
-    public static MarkdownPipelineBuilder UseAutoLinkHeadings(this MarkdownPipelineBuilder pipeline)
+    public static MarkdownPipelineBuilder UseAutoLinkHeadings(this MarkdownPipelineBuilder pipeline, object input, string path)
     {
-        pipeline.Extensions.AddIfNotAlready(new AutoLinkHeadingsExtension());
+        var relativeHtmlPath = string.Empty;
+
+        if(input.GetType() == typeof(MarkdownBlog))
+        {
+            var post = ((MarkdownBlog)input).VisiblePosts.FirstOrDefault(x => path.Contains(x.FileName));
+
+            if(post != null)
+            {
+                relativeHtmlPath = $"/posts/{post.Slug}";
+            }
+        }
+
+        pipeline.Extensions.AddIfNotAlready(new AutoLinkHeadingsExtension(relativeHtmlPath));
+
         return pipeline;
     }
 
@@ -981,4 +1001,4 @@ public class MarkdownMenuItem
 {
     public string Text { get; set; }
     public string Link { get; set; }
-}
\ No newline at end of file
+}