Simple format excerpts in activity

app/helpers/excerpt_helper.rb

@@ -0,0 +1,12 @@
+module ExcerptHelper
+  def format_excerpt(content, length: 200)
+    return "" if content.blank?
+
+    text = content.to_plain_text
+    text = text.gsub(/^>\s*(.*)$/m, '> \1')
+    text = text.gsub(/^[-*]\s*(.*)$/m, '• \1')
+    text = text.gsub(/^\d+\.\s*(.*)$/m) { |m| m }
+    text = text.gsub(/\s+/, " ").strip
+    text.truncate(length)
+  end
+end

app/views/events/event/_comment.html.erb

@@ -1,5 +1,5 @@
 <%= render "events/event/layout", card: event.eventable.card, event: event do %>
   <span class="txt-break overflow-line-clamp txt-tight-lines">
-    <%= strip_tags(event&.eventable.body.to_s).truncate(200) -%>
+    <%= format_excerpt(event&.eventable.body, length: 200) -%>
   </span>
 <% end %>