Have the LLM use square bracketed links for internal references

lib/music_library/chats/collection_chat.ex

@@ -24,6 +24,10 @@ defmodule MusicLibrary.Chats.CollectionChat do
 
     Collection catalog:
     #{collection_summary}
+
+    # Mentioning artists/albums
+
+    **IF YOU MENTION AN ARTIST NAME OR ALBUM NAME, wrap it in "[[name]]", for example "[[Steven Wilson]]"
     """)
   end
 end

lib/music_library_web/markdown.ex

@@ -120,19 +120,27 @@ defmodule MusicLibraryWeb.Markdown do
   end
 
   defp open_links_in_new_tab(doc, target) do
-    MDEx.Document.update_nodes(doc, MDEx.Link, fn %MDEx.Link{url: url, title: title, nodes: nodes} ->
-      text = extract_text(nodes)
+    MDEx.Document.update_nodes(doc, MDEx.Link, fn %MDEx.Link{url: url} = link ->
+      if external_link?(url) do
+        text = extract_text(link.nodes)
 
         title_attr =
-        if title != "" and title != nil, do: ~s( title="#{html_escape(title)}"), else: ""
+          if link.title != "" and link.title != nil,
+            do: ~s( title="#{html_escape(link.title)}"),
+            else: ""
 
         %MDEx.HtmlInline{
           literal:
             ~s(<a href="#{html_escape(url)}" target="#{target}"#{title_attr}>#{html_escape(text)}</a>)
         }
+      else
+        link
+      end
     end)
   end
 
+  defp external_link?(url), do: url =~ ~r"^https?://"
+
   defp extract_text(nodes) when is_list(nodes), do: Enum.map_join(nodes, "", &extract_text/1)
   defp extract_text(%{literal: literal}), do: literal
   defp extract_text(%{nodes: nodes}), do: extract_text(nodes)

test/music_library_web/markdown_test.exs

@@ -83,10 +83,11 @@ defmodule MusicLibraryWeb.MarkdownTest do
       assert result =~ ~s(href="http://example.com")
     end
 
-    test "adds target to double bracket links" do
+    test "does not add target to internal links" do
       result = Markdown.to_html("Check [[Porcupine Tree]]", link_target: "_blank")
 
-      assert result =~ ~s(target="_blank")
+      refute result =~ ~s(target="_blank")
+      assert result =~ ~s(href="/collection?query=Porcupine+Tree")
       assert result =~ "Porcupine Tree</a>"
     end