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

[Anton Khorev]

@AntonKhorev commented on this pull request.



> +    def truncate_html(html_doc, max_length = nil, empty_tag_length = 1000)
+      return html_doc if max_length.nil?
+
+      doc = Nokogiri::HTML::DocumentFragment.parse(html_doc)
+      accumulated_length = 0
+      last_child = nil
+
+      doc.traverse do |node|
+        if accumulated_length >= max_length
+          node.remove unless !last_child.nil? && last_child.ancestors.include?(node)
+          next
+        end
+
+        next unless node.children.empty?
+
+        accumulated_length += node.text? ? node.text.length : empty_tag_length

> Images now take size of 1000 character.

Any empty tag costs 1000 characters. For example, empty paragraph costs 1000 characters. Something like this becomes empty:

```
<p></p>
<p></p>

hello?
```

Some tags are naturally empty, for example `<br>`. In this example "3" is truncated:

```
1  
2  
3
```
(note spaces in markdown after "1" and "2")


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