FIX: Replace details content with instruction.

plugins/discourse-details/config/locales/server.en.yml

@@ -1,3 +1,5 @@
 en:
   site_settings:
     details_enabled: "Enable the details feature. If you change this, you must rebake all posts with: \"rake posts:rebake\"."
+  details:
+    excerpt_details: "(click for more details)"

plugins/discourse-details/plugin.rb

@@ -31,8 +31,14 @@ after_initialize do
     end
   end
 
-  on(:reduce_cooked) do |fragment|
-    fragment.css("details.elided").each(&:remove)
+  on(:reduce_cooked) do |fragment, post|
+    fragment.css("details").each do |el|
+      text = fragment.css("summary").text
+      link = fragment.document.create_element("a")
+      link["href"] = post.url if post
+      link.content = I18n.t("details.excerpt_details")
+      el.replace text + " " + link.to_html
+    end
   end
 
 end

plugins/discourse-details/spec/components/pretty_text_spec.rb

@@ -5,6 +5,8 @@ require 'pretty_text'
 
 describe PrettyText do
 
+  let(:post) { Fabricate(:post) }
+
   it "supports details tag" do
     cooked_html = <<~HTML
       <details>
@@ -20,9 +22,23 @@ describe PrettyText do
 
   it "deletes elided content" do
     cooked_html = PrettyText.cook("Hello World\n\n<details class='elided'>42</details>")
-    mail_html   = PrettyText.cook("Hello World")
+    mail_html   = "<p>Hello World</p>\n<a href=\"http://test.localhost\">(click for more details)</a>"
 
     expect(PrettyText.format_for_email(cooked_html)).to match_html(mail_html)
   end
 
+  it 'can replace spoilers in emails' do
+    md = PrettyText.cook(<<~EOF)
+      hello
+
+      [details="Summary"]
+      world
+      [/details]
+    EOF
+    md = PrettyText.format_for_email(md, post)
+    html = "<p>hello</p>\n\nSummary <a href=\"#{post.full_url}\">(click for more details)</a>"
+
+    expect(md).to eq(html)
+  end
+
 end