Check for unused files in output folder

CHDataManagement/Model/Content+Generation.swift

@@ -5,6 +5,9 @@ extension Content {
     func generateWebsiteInAllLanguages() {
         performGenerationIfIdle {
             self.results.reset()
+            self.storage.writeNotification = { [weak self] in
+                self?.results.created(outputFile: $0)
+            }
             self.generatePagesInternal()
             self.generatePostFeedPagesInternal()
             self.generateTagPagesInternal()
@@ -15,6 +18,7 @@ extension Content {
             self.results.recalculate()
             self.generateListOfExternalFiles()
             self.generateListOfUrlMappings()
+            self.updateUnusedFiles()
             self.status("Generation completed")
         }
     }
@@ -77,6 +81,7 @@ extension Content {
                 status("Generating required images: \(completed) / \(count)")
             }
             if imageGenerator.generate(version: image) {
+                results.created(outputFile: image.outputPath)
                 continue
             }
             results.failed(image: image)
@@ -343,4 +348,11 @@ extension Content {
 
         storage.write(content, to: redirectsListFileName)
     }
+
+    private func updateUnusedFiles() {
+        let existing = storage.getAllOutputFiles()
+        DispatchQueue.main.async {
+            self.results.determineFiles(unusedIn: existing)
+        }
+    }
 }