add options for link inline

Author: danielklecha

src/Markdig/Parsers/Inlines/LinkInlineOptions.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Markdig.Parsers.Inlines;
+
+public class LinkInlineOptions
+{
+    /// <summary>
+    /// Should the link open in a new window when clicked (false by default)
+    /// </summary>
+    public bool OpenInNewWindow { get; set; }
+}

src/Markdig/Parsers/Inlines/LinkInlineParser.cs

@@ -3,6 +3,7 @@
 // See the license.txt file in the project root for more information.
 
 using Markdig.Helpers;
+using Markdig.Renderers.Html;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
 
@@ -17,11 +18,22 @@ public class LinkInlineParser : InlineParser
     /// <summary>
     /// Initializes a new instance of the <see cref="LinkInlineParser"/> class.
     /// </summary>
-    public LinkInlineParser()
+    public LinkInlineParser() : this(new LinkInlineOptions())
     {
+
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="LinkInlineParser"/> class.
+    /// </summary>
+    public LinkInlineParser(LinkInlineOptions options)
+    {
+        Options = options ?? throw new ArgumentNullException(nameof(options));
         OpeningCharacters = ['[', ']', '!'];
     }
 
+    public readonly LinkInlineOptions Options;
+
     public override bool Match(InlineProcessor processor, ref StringSlice slice)
     {
         // The following methods are inspired by the "An algorithm for parsing nested emphasis and links"
@@ -169,6 +181,11 @@ private bool ProcessLinkReference(
                 linkInline.LocalLabel = localLabel;
             }
 
+            if (Options.OpenInNewWindow)
+            {
+                linkInline.GetAttributes().AddPropertyIfNotExist("target", "_blank");
+            }
+
             link = linkInline;
         }