#1552 Title in HTML head

src/Elastic.Documentation/Exporter.cs

@@ -16,6 +16,7 @@ public enum Exporter
 	DocumentationState,
 	LinkMetadata,
 	Redirects,
+	MarkdownValidation
 }
 public static class ExportOptions
 {

src/Elastic.Markdown/Exporters/ExporterExtensions.cs

@@ -27,6 +27,7 @@ string indexNamespace
 			markdownExporters.Add(new ElasticsearchMarkdownSemanticExporter(logFactory, context.Collector, indexNamespace, context.Endpoints));
 		if (exportOptions.Contains(Exporter.ElasticsearchNoSemantic))
 			markdownExporters.Add(new ElasticsearchMarkdownExporter(logFactory, context.Collector, indexNamespace, context.Endpoints));
+		markdownExporters.Add(new MarkdownValidationExporter());
 		return markdownExporters;
 	}
 }

src/Elastic.Markdown/Exporters/MarkdownValidationExporter.cs

@@ -0,0 +1,57 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+using System.IO.Abstractions;
+using Elastic.Markdown.Exporters;
+using Elastic.Markdown.IO;
+
+namespace Elastic.Markdown.Exporters;
+
+public class MarkdownValidationExporter : IMarkdownExporter
+{
+	private readonly List<MarkdownFile> _files = [];
+
+	/// <inheritdoc />
+	public ValueTask StartAsync(Cancel ctx = default) => default;
+
+	/// <inheritdoc />
+	public ValueTask StopAsync(Cancel ctx = default)
+	{
+		var titleMap = new Dictionary<string, List<MarkdownFile>>(StringComparer.OrdinalIgnoreCase);
+		foreach (var file in _files)
+		{
+			if (string.IsNullOrWhiteSpace(file.Title))
+			{
+				Console.WriteLine($"Error: File {file.FilePath} has no title");
+				continue;
+			}
+			if (!titleMap.TryGetValue(file.Title, out var list))
+				titleMap[file.Title] = [];
+			titleMap[file.Title].Add(file);
+		}
+		foreach (var kv in titleMap)
+		{
+			var files = kv.Value;
+			if (files.Count > 1)
+			{
+				var title = kv.Key;
+				var filePaths = string.Join(", ", files.Select(f => f.FilePath));
+				Console.WriteLine($"Error: Title '{title}' is used in multiple files: {filePaths}");
+			}
+		}
+		return default;
+	}
+
+	/// <inheritdoc />
+	public ValueTask<bool> ExportAsync(MarkdownExportFileContext fileContext, Cancel ctx)
+	{
+		var markdownFile = fileContext.SourceFile;
+		_files.Add(markdownFile);
+		Console.WriteLine($"+++ MarkdownValidationExporter: document.Title: {markdownFile.Title}");
+		return ValueTask.FromResult(true);
+	}
+
+	/// <inheritdoc />
+	public ValueTask<bool> FinishExportAsync(IDirectoryInfo outputFolder, Cancel ctx) => ValueTask.FromResult(true);
+}