Refactor and use Markdig to strip markdown

src/Elastic.Markdown/Helpers/TitleSanitizer.cs → src/Elastic.Markdown/Helpers/Markdown.cs

@@ -3,9 +3,14 @@
 // See the LICENSE file in the project root for more information
 
 namespace Elastic.Markdown.Helpers;
-public static class TitleNormalizer
+
+public static class Markdown
 {
 	// Removes markdown formatting from the title and returns only the text
-	// Currently, only support 'bold' and 'code' formatting
-	public static string Normalize(string title) => title.Replace("`", "").Replace("*", "");
+	public static string StripMarkdown(string markdown)
+	{
+		using var writer = new StringWriter();
+		Markdig.Markdown.ToPlainText(markdown, writer);
+		return writer.ToString();
+	}
 }

src/Elastic.Markdown/IO/MarkdownFile.cs

@@ -49,7 +49,7 @@ public string? NavigationTitle
 		get
 		{
 			var title = !string.IsNullOrEmpty(_navigationTitle) ? _navigationTitle : Title;
-			return string.IsNullOrEmpty(title) ? null : TitleNormalizer.Normalize(title);
+			return string.IsNullOrEmpty(title) ? null : Helpers.Markdown.StripMarkdown(title);
 		}
 		private set => _navigationTitle = value;
 	}
@@ -163,7 +163,7 @@ private void ReadDocumentInstructions(MarkdownDocument document)
 			.Select(h => (h.GetData("header") as string, h.GetData("anchor") as string))
 			.Select(h => new PageTocItem
 			{
-				Heading = TitleNormalizer.Normalize(h.Item1!),
+				Heading = Helpers.Markdown.StripMarkdown(h.Item1!),
 				Slug = _slugHelper.GenerateSlug(h.Item2 ?? h.Item1)
 			})
 			.ToList();