Refactor page content generators

CHDataManagement/Generator/Markdown/MarkdownHeadlineProcessor.swift

@@ -0,0 +1,38 @@
+import Ink
+
+struct MarkdownHeadlineProcessor: MarkdownProcessor {
+
+    static let modifier: Modifier.Target = .headings
+
+    let content: Content
+
+    let results: PageGenerationResults
+
+    let language: ContentLanguage
+
+    init(content: Content, results: PageGenerationResults, language: ContentLanguage) {
+        self.content = content
+        self.results = results
+        self.language = language
+    }
+
+    /**
+     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: ">")
+    }
+}