testing hashtag extraction

src/BirdsiteLive.Domain/Tools/StatusExtractor.cs

@@ -1,7 +1,53 @@
-namespace BirdsiteLive.Domain.Tools
+using System.Collections.Generic;
+using System.Text.RegularExpressions;
+using BirdsiteLive.ActivityPub.Models;
+using BirdsiteLive.Common.Settings;
+
+namespace BirdsiteLive.Domain.Tools
 {
-    public class StatusExtractor
+    public interface IStatusExtractor
     {
-        
+        (string content, Tag[] tags) ExtractTags(string messageContent);
+    }
+
+    public class StatusExtractor : IStatusExtractor
+    {
+        private readonly InstanceSettings _instanceSettings;
+
+        #region Ctor
+        public StatusExtractor(InstanceSettings instanceSettings)
+        {
+            _instanceSettings = instanceSettings;
+        }
+        #endregion
+
+        public (string content, Tag[] tags) ExtractTags(string messageContent)
+        {
+            var regex = new Regex(@"\W(\#[a-zA-Z0-9]+\b)(?!;)");
+            var match = regex.Matches(messageContent);
+
+            var tags = new List<Tag>();
+            foreach (var m in match)
+            {
+                var tag = m.ToString().Replace("#", string.Empty).Replace("\n", string.Empty).Trim();
+                var url = $"https://{_instanceSettings.Domain}/tags/{tag}";
+
+                tags.Add(new Tag
+                {
+                    name = $"#{tag}",
+                    href = url,
+                    type = "Hashtag"
+                });
+
+                messageContent = Regex.Replace(messageContent, m.ToString(),
+                    $@"<a href=""{url}"" class=""mention hashtag"" rel=""tag"">#<span>{tag}</span></a>");
+                
+                //messageContent = messageContent.Replace(
+                //    $"#{tag}",
+                //    $@"<a href=""{url}"" class=""mention hashtag"" rel=""tag"">#<span>{tag}</span></a>");
+            }
+
+            return (messageContent, new Tag[0]);
+        }
     }
 }