Introduce parameter for controlling indentation

Changed the default indentation (back) to disabled, as a means of reducing the file size. Introduced a new `indent` parameter which defaults to false, but which can be optionally enabled in order to allow indentation to be maintained, thus increasing human readability.

Author: JeremyCaney

OnTopic.AspNetCore.Mvc/Controllers/SitemapController.cs

@@ -90,8 +90,9 @@ public SitemapController(ITopicRepository topicRepository) {
     /// <summary>
     ///   Provides the Sitemap.org sitemap for the site.
     /// </summary>
+    /// <param name="indent">Optionally enables indentation of XML elements in output for human readability.</param>
     /// <returns>The site's homepage view.</returns>
-    public virtual ActionResult Index() {
+    public virtual ActionResult Index(bool indent = false) {
 
       /*------------------------------------------------------------------------------------------------------------------------
       | Ensure topics are loaded
@@ -109,11 +110,12 @@ public virtual ActionResult Index() {
       \-----------------------------------------------------------------------------------------------------------------------*/
       var declaration           = new XDeclaration("1.0", "utf-8", "no");
       var sitemap               = GenerateSitemap(rootTopic);
+      var settings              = indent? SaveOptions.None : SaveOptions.DisableFormatting;
 
       /*------------------------------------------------------------------------------------------------------------------------
       | Return the homepage view
       \-----------------------------------------------------------------------------------------------------------------------*/
-      return Content(declaration.ToString() + sitemap.ToString(), "text/xml");
+      return Content(declaration.ToString() + sitemap.ToString(settings), "text/xml");
 
     }