Add links to headlines

CHDataManagement/Generator/Markdown/MarkdownHeadlineProcessor.swift

@@ -19,20 +19,20 @@ struct MarkdownHeadlineProcessor: MarkdownProcessor {
     /**
      Modify headlines by extracting an id from the headline and adding it into the html element
 
-     Format: ##<title>#<id>
-
      The id is created by lowercasing the string, removing all special characters, and replacing spaces with scores
      */
     func process(html: String, markdown: Substring) -> String {
-        let id = markdown
-            .last(after: "#")
-            .trimmed
-            .filter { $0.isNumber || $0.isLetter || $0 == " " }
-            .lowercased()
-            .components(separatedBy: " ")
-            .filter { $0 != "" }
-            .joined(separator: "-")
-        let parts = html.components(separatedBy: ">")
-        return parts[0] + " id=\"\(id)\">" + parts.dropFirst().joined(separator: ">")
+        let parts2 = markdown.components(separatedBy: "#")
+        // Determine the type of heading, e.g. 2 for <h2>
+        let headlineParts = parts2.drop { $0.isEmpty }
+        let headlineType = parts2.count - headlineParts.count
+
+        guard headlineType > 1 && headlineType < 4 else {
+            return html
+        }
+
+        let title = headlineParts.joined(separator: "#")
+        let headline = HeadlineLink(level: headlineType, title: title)
+        return headline.content
     }
 }