Syntax highlight swift code

WebsiteGenerator/Generators/MarkdownProcessor.swift

@@ -1,5 +1,6 @@
 import Foundation
 import Ink
+import Splash
 
 struct PageContentGenerator {
 
@@ -7,6 +8,8 @@ struct PageContentGenerator {
 
     private let files: FileProcessor
 
+    private let swift = SyntaxHighlighter(format: HTMLOutputFormat())
+
     init(factory: TemplateFactory, files: FileProcessor) {
         self.factory = factory
         self.files = files
@@ -31,8 +34,8 @@ struct PageContentGenerator {
         }
         let codeModifier = Modifier(target: .codeBlocks) { html, markdown in
             if markdown.starts(with: "```swift") {
-                #warning("Syntax highlight swift code")
-                return html
+                let code = markdown.between("```swift", and: "```").trimmed
+                return "<pre><code>" + swift.highlight(code) + "</pre></code>"
             }
             hasCodeContent = true
             return html