[openstreetmap/openstreetmap-website] Provide a truncated view of recent diaries (PR #5121)

[David Tsiklauri]

@nertc commented on this pull request.



> +  def truncate_html(html, max_length, empty_tag_length = 500)
+    doc = Nokogiri::HTML::DocumentFragment.parse(html)
+    accumulated_length = 0
+    truncated_node = nil
+
+    doc.traverse do |node|
+      if accumulated_length >= max_length
+        node.remove unless truncated_node.ancestors.include?(node)
+        next
+      end
+
+      next unless node.children.empty?
+
+      content_length = node.text? ? node.text.length : empty_tag_length
+      if accumulated_length + content_length >= max_length
+        node.content = node.text.truncate(max_length - accumulated_length) if node.text?

What do you think is a good number for the limit?

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