@tomhughes commented on this pull request.


>        end.html_safe
     end
 
     private
 
+    def expand_link_shorthands(text)
+      linkify_detection_rules = Array.wrap(Settings.linkify&.detection_rules)
+      linkify_detection_rules.each do |rule|
+        next unless rule.path_template && rule.patterns.is_a?(Array)
+
+        rule.patterns.each do |pattern|
+          expanded_path = "#{Settings.server_protocol}://#{rule.host || 
Settings.server_url}/#{rule.path_template}"
+          
text.gsub!(Regexp.new("(?<before>\\s|^|>)#{pattern}(?<after>\\s|$|<)", 
Regexp::IGNORECASE), "\\k<before>#{expanded_path}\\k<after>")
+        end
+      end
+      [[Settings.linkify_hosts, Settings.linkify_hosts_replacement], 
[Settings.linkify_wiki_hosts, Settings.linkify_wiki_hosts_replacement]].each do 
|hosts, replacement|
+        text.gsub!(/(\s)#{Regexp.escape(replacement)}/, 
"\\1#{Settings.server_protocol}://#{hosts[0]}") if replacement && hosts&.any?
+      end

Can you explain the purpose of this? It comes from a commit that says "Fix 
copy-pasting breaking links in linkify" but what exactly is breaking the links 
and why does this fix it?

The PR talks about it rewriting the URL to use a canonical name but wasn't the 
short name (which you're rewriting from here) supposed to be the canonical name?

> @@ -139,6 +139,35 @@ fossgis_valhalla_url: 
> "https://valhalla1.openstreetmap.de/route";
 # Endpoints for Wikimedia integration
 wikidata_api_url: "https://www.wikidata.org/w/api.php";
 wikimedia_commons_url: "https://commons.wikimedia.org/wiki/";
+linkify:
+  detection_rules:
+    - patterns: ["node/(?<id>\\d+)", "node (?<id>\\d{5,})", "n(?<id>\\d+)"]
+      path_template: "node/\\k<id>"
+    - patterns: ["way/(?<id>\\d+)", "way (?<id>\\d{5,})", "w(?<id>\\d+)"]
+      path_template: "way/\\k<id>"
+    - patterns: ["relation/(?<id>\\d+)", "relation (?<id>\\d{5,})", 
"r(?<id>\\d+)"]
+      path_template: "relation/\\k<id>"
+    - patterns: ["changeset/(?<id>\\d+)", "changeset (?<id>\\d{5,})", "cs 
?(?<id>\\d{5,})"]

Why do we allow a space after `cs` but not after object object types like `n` 
or `w`?

>        end.html_safe
     end
 
     private
 
+    def expand_link_shorthands(text)
+      linkify_detection_rules = Array.wrap(Settings.linkify&.detection_rules)
+      linkify_detection_rules.each do |rule|
+        next unless rule.path_template && rule.patterns.is_a?(Array)
+
+        rule.patterns.each do |pattern|
+          expanded_path = "#{Settings.server_protocol}://#{rule.host || 
Settings.server_url}/#{rule.path_template}"

It makes sense to combine `Settings.server_protocol` and `Settings.server_url` 
but there's no logical reason it's right combine it with `rule.host`? Should 
the rules have a base URL rather than just a host?

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