Sources/Generator/Content/Element.swift

@@ -183,7 +183,7 @@ struct Element {
         self.sortIndex = log.unused(metadata.sortIndex, "sortIndex", source: source)
         self.externalFiles = metadata.externalFiles ?? []
         self.requiredFiles = metadata.requiredFiles ?? [] // Paths are already relative to root
-        self.images = metadata.images?.compactMap { ManualImage(input: $0, path: "", log: log) } ?? []
+        self.images = metadata.images?.compactMap { ManualImage(input: $0, path: "") } ?? []
         self.thumbnailPath = metadata.thumbnailPath ?? Element.defaultThumbnailName
         self.thumbnailStyle = log.castUnused(metadata.thumbnailStyle, "thumbnailStyle", source: source)
         self.useManualSorting = log.unused(metadata.useManualSorting, "useManualSorting", source: source)
@@ -204,7 +204,7 @@ struct Element {
             return nil
         }
 
-        //files.add(page: path, id: id)
+        files.add(page: path, id: id)
         self.readElements(in: folder, source: nil, log: log)
     }
 
@@ -239,13 +239,13 @@ struct Element {
         self.author = metadata.author ?? parent.author
         self.topBarTitle = log.unused(metadata.topBarTitle, "topBarTitle", source: source)
         self.date = metadata.date.unwrapped { log.cast($0, "date", source: source) }
-        self.endDate = metadata.endDate.unwrapped { log.cast($0, "endDate", source: source) }
+        self.endDate = metadata.date.unwrapped { log.cast($0, "endDate", source: source) }
         self.state = log.cast(metadata.state, "state", source: source)
         self.sortIndex = metadata.sortIndex
         // TODO: Propagate external files from the parent if subpath matches?
         self.externalFiles = Element.rootPaths(for: metadata.externalFiles, path: path)
         self.requiredFiles = Element.rootPaths(for: metadata.requiredFiles, path: path)
-        self.images = metadata.images?.compactMap { ManualImage(input: $0, path: path, log: log) } ?? []
+        self.images = metadata.images?.compactMap { ManualImage(input: $0, path: path) } ?? []
         self.thumbnailPath = metadata.thumbnailPath ?? Element.defaultThumbnailName
         self.thumbnailStyle = log.cast(metadata.thumbnailStyle, "thumbnailStyle", source: source)
         self.useManualSorting = metadata.useManualSorting ?? false
@@ -285,21 +285,9 @@ struct Element {
             return nil
         }
 
-        //files.add(page: path, id: id)
+        files.add(page: path, id: id)
         self.readElements(in: folder, source: path, log: log)
     }
-
-    func getContainedIds(log: MetadataInfoLogger) -> [String : String] {
-        elements.reduce(into: [id : path]) { dict, element in
-            element.getContainedIds(log: log).forEach { id, path in
-                if let existing = dict[id] {
-                    log.error("Conflicting id with \(existing)", source: path)
-                } else {
-                    dict[id] = path
-                }
-            }
-        }
-    }
 }
 
 // MARK: Paths
@@ -578,14 +566,21 @@ extension Element {
 
 extension Element {
 
-    var additionalHeadContentPath: String {
+    private var additionalHeadContentPath: String {
         path + "/head.html"
     }
 
-    var additionalFooterContentPath: String {
+    func customHeadContent() -> String? {
+        files.contentOfOptionalFile(atPath: additionalHeadContentPath, source: path)
+    }
+
+    private var additionalFooterContentPath: String {
         path + "/footer.html"
     }
 
+    func customFooterContent() -> String? {
+        files.contentOfOptionalFile(atPath: additionalFooterContentPath, source: path)
+    }
 }
 
 // MARK: Debug
@@ -612,14 +607,14 @@ extension Element {
 
         let desiredHeight: Int?
 
-        init?(input: String, path: String, log: MetadataInfoLogger) {
+        init?(input: String, path: String) {
             let parts = input.components(separatedBy: " ").filter { !$0.isEmpty }
             guard parts.count == 3 || parts.count == 4 else {
-                log.error("Invalid image specification, expected 'source dest width (height)", source: path)
+                log.add(error: "Invalid image specification, expected 'source dest width (height)", source: path)
                 return nil
             }
             guard let width = Int(parts[2]) else {
-                log.error("Invalid width for image \(parts[0])", source: path)
+                log.add(error: "Invalid width for image \(parts[0])", source: path)
                 return nil
             }
 
@@ -631,7 +626,7 @@ extension Element {
                 return
             }
             guard let height = Int(parts[3]) else {
-                log.error("Invalid height for image \(parts[0])", source: path)
+                log.add(error: "Invalid height for image \(parts[0])", source: path)
                 return nil
             }
             self.desiredHeight = height
@@ -721,6 +716,10 @@ extension Element {
             let destination = pathRelativeToRootForContainedInputFile("thumbnail-\(language).\(ext)")
             return (source, destination)
         }
+        let thumbnailUrl = inputFolder.appendingPathComponent(thumbnailPath)
+        if !thumbnailUrl.exists {
+            log.add(error: "Missing thumbnail", source: path)
+        }
         let source = pathRelativeToRootForContainedInputFile(thumbnailPath)
         let ext = thumbnailPath.lastComponentAfter(".")
         let destination = pathRelativeToRootForContainedInputFile("thumbnail.\(ext)")

Sources/Generator/Files/FileSystem.swift

@@ -0,0 +1,443 @@
+import Foundation
+import CryptoKit
+import AppKit
+
+final class FileSystem {
+
+    private static let tempFileName = "temp.bin"
+
+    private let input: URL
+
+    private let output: URL
+
+    private let source = "FileSystem"
+
+    private let images: ImageGenerator
+
+    private let configuration: Configuration
+
+    private var tempFile: URL {
+        input.appendingPathComponent(FileSystem.tempFileName)
+    }
+
+    let generatorInfoFolder: URL
+
+    /**
+     All files which should be copied to the output folder
+     */
+    private var requiredFiles: Set<String> = []
+
+    /**
+     The files marked as external in element metadata.
+
+     Files included here are not generated, since they are assumed to be added separately.
+     */
+    private var externalFiles: Set<String> = []
+
+    /**
+     The files marked as expected, i.e. they exist after the generation is completed.
+
+     The key of the dictionary is the file path, the value is the file providing the link
+     */
+    private var expectedFiles: [String : String] = [:]
+
+    /**
+     All pages without content which have been created
+     */
+    private var emptyPages: Set<String> = []
+
+    /**
+     All pages which have `status` set to ``PageState.draft``
+     */
+    private var draftPages: Set<String> = []
+
+    /**
+     All paths to page element folders, indexed by their unique id.
+
+     This relation is used to generate relative links to pages using the ``Element.id`
+     */
+    private var pagePaths: [String: String] = [:]
+
+    /**
+     The image creation tasks.
+
+     The key is the destination path.
+     */
+    private var imageTasks: [String : ImageOutput] = [:]
+
+    /**
+     The paths to all pages which were changed
+     */
+    private var generatedPages: Set<String> = []
+
+    init(in input: URL, to output: URL, configuration: Configuration) {
+        self.input = input
+        self.output = output
+        self.images = .init(input: input, output: output)
+        self.generatorInfoFolder = input.appendingPathComponent("run")
+        self.configuration = configuration
+    }
+
+    func urlInOutputFolder(_ path: String) -> URL {
+        output.appendingPathComponent(path)
+    }
+
+    func urlInContentFolder(_ path: String) -> URL {
+        input.appendingPathComponent(path)
+    }
+
+    private func exists(_ url: URL) -> Bool {
+        FileManager.default.fileExists(atPath: url.path)
+    }
+
+    func dataOfRequiredFile(atPath path: String, source: String) -> Data? {
+        let url = input.appendingPathComponent(path)
+        guard exists(url) else {
+            log.failedToOpen(path, requiredBy: source, error: nil)
+            return nil
+        }
+
+        do {
+            return try Data(contentsOf: url)
+        } catch {
+            log.failedToOpen(path, requiredBy: source, error: error)
+            return nil
+        }
+    }
+
+    func contentOfMdFile(atPath path: String, source: String) -> String? {
+        contentOfOptionalFile(atPath: path, source: source, createEmptyFileIfMissing: configuration.createMdFilesIfMissing)
+    }
+
+    func contentOfOptionalFile(atPath path: String, source: String, createEmptyFileIfMissing: Bool = false) -> String? {
+        let url = input.appendingPathComponent(path)
+        guard exists(url) else {
+            if createEmptyFileIfMissing {
+                try? Data().write(to: url)
+            }
+            return nil
+        }
+
+        do {
+            return try String(contentsOf: url)
+        } catch {
+            log.failedToOpen(path, requiredBy: source, error: error)
+            return nil
+        }
+    }
+
+    func writeDetectedFileChangesToDisk() {
+        images.writeDetectedFileChangesToDisk()
+    }
+    
+    // MARK: Images
+
+    @discardableResult
+    func requireSingleImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int? = nil) -> NSSize {
+        images.requireImage(
+            at: destination,
+            generatedFrom: source,
+            requiredBy: path,
+            quality: 0.7,
+            width: width,
+            height: desiredHeight,
+            alwaysGenerate: false)
+    }
+
+    /**
+     Create images of different types.
+
+     This function generates versions for the given image, including png/jpg, avif, and webp. Different pixel density versions (1x and 2x) are also generated.
+     - Parameter destination: The path to the destination file
+     */
+    @discardableResult
+    func requireMultiVersionImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int? = nil)  -> NSSize {
+        images.requireMultiVersionImage(source: source, destination: destination, requiredBy: path, width: width, desiredHeight: desiredHeight)
+    }
+
+    func requireFullSizeMultiVersionImage(source: String, destination: String, requiredBy path: String) -> NSSize {
+        images.requireMultiVersionImage(source: source, destination: destination, requiredBy: path, width: configuration.pageImageWidth, desiredHeight: nil)
+    }
+
+    func createImages() {
+        images.createImages()
+    }
+
+    // MARK: File copying
+
+    /**
+     Add a file as required, so that it will be copied to the output directory.
+     */
+    func require(file: String) {
+        let url = input.appendingPathComponent(file)
+        guard url.exists, url.isDirectory else {
+            requiredFiles.insert(file)
+            return
+        }
+        do {
+            try FileManager.default
+                .contentsOfDirectory(atPath: url.path)
+                .forEach {
+                    // Recurse into subfolders
+                    require(file: file + "/" + $0)
+                }
+        } catch {
+            log.add(error: "Failed to read folder \(file): \(error)", source: source)
+        }
+    }
+
+    /**
+     Mark a file as explicitly missing.
+
+     This is done for the `externalFiles` entries in metadata,
+     to indicate that these files will be copied to the output folder manually.
+     */
+    func exclude(file: String) {
+        externalFiles.insert(file)
+    }
+
+    /**
+     Mark a file as expected to be present in the output folder after generation.
+
+     This is done for all links between pages, which only exist after the pages have been generated.
+     */
+    func expect(file: String, source: String) {
+        expectedFiles[file] = source
+    }
+
+    func copyRequiredFiles() {
+        var copiedFiles = Set<String>()
+        for file in requiredFiles {
+            let cleanPath = cleanRelativeURL(file)
+            let sourceUrl = input.appendingPathComponent(cleanPath)
+            let destinationUrl = output.appendingPathComponent(cleanPath)
+            guard sourceUrl.exists else {
+                if !isExternal(file: file) {
+                    log.add(error: "Missing required file", source: cleanPath)
+                }
+                continue
+            }
+            if copyFileIfChanged(from: sourceUrl, to: destinationUrl) {
+                copiedFiles.insert(file)
+            }
+        }
+        try? tempFile.delete()
+        for (file, source) in expectedFiles {
+            guard !isExternal(file: file) else {
+                continue
+            }
+            let cleanPath = cleanRelativeURL(file)
+            let destinationUrl = output.appendingPathComponent(cleanPath)
+            if !destinationUrl.exists {
+                log.add(error: "Missing \(cleanPath)", source: source)
+            }
+        }
+        guard !copiedFiles.isEmpty else {
+            print("No required files copied")
+            return
+        }
+        print("\(copiedFiles.count) required files copied:")
+        for file in copiedFiles.sorted() {
+            print("  " + file)
+        }
+    }
+
+    private func copyFileIfChanged(from sourceUrl: URL, to destinationUrl: URL) -> Bool {
+        guard configuration.minifyCSSandJS else {
+            return copyBinaryFileIfChanged(from: sourceUrl, to: destinationUrl)
+        }
+        switch sourceUrl.pathExtension.lowercased() {
+        case "js":
+            return minifyJS(at: sourceUrl, andWriteTo: destinationUrl)
+        case "css":
+            return minifyCSS(at: sourceUrl, andWriteTo: destinationUrl)
+        default:
+            return copyBinaryFileIfChanged(from: sourceUrl, to: destinationUrl)
+        }
+    }
+
+    private func copyBinaryFileIfChanged(from sourceUrl: URL, to destinationUrl: URL) -> Bool {
+        do {
+            let data = try Data(contentsOf: sourceUrl)
+            return writeIfChanged(data, to: destinationUrl)
+        } catch {
+            log.add(error: "Failed to read data at \(sourceUrl.path)", source: source, error: error)
+            return false
+        }
+    }
+
+    private func minifyJS(at sourceUrl: URL, andWriteTo destinationUrl: URL) -> Bool {
+        let command = "uglifyjs \(sourceUrl.path) > \(tempFile.path)"
+        do {
+            _ = try FileSystem.safeShell(command)
+            return copyBinaryFileIfChanged(from: tempFile, to: destinationUrl)
+        } catch {
+            log.add(error: "Failed to minify \(sourceUrl.path): \(error)", source: source)
+            return false
+        }
+    }
+
+    private func minifyCSS(at sourceUrl: URL, andWriteTo destinationUrl: URL) -> Bool {
+        let command = "cleancss \(sourceUrl.path) -o \(tempFile.path)"
+        do {
+            _ = try FileSystem.safeShell(command)
+            return copyBinaryFileIfChanged(from: tempFile, to: destinationUrl)
+        } catch {
+            log.add(error: "Failed to minify \(sourceUrl.path): \(error)", source: source)
+            return false
+        }
+    }
+
+    private func cleanRelativeURL(_ raw: String) -> String {
+        let raw = raw.dropAfterLast("#") // Clean links to page content
+        guard raw.contains("..") else {
+            return raw
+        }
+        var result: [String] = []
+        for component in raw.components(separatedBy: "/") {
+            if component == ".." {
+                _ = result.popLast()
+            } else {
+                result.append(component)
+            }
+        }
+        return result.joined(separator: "/")
+    }
+
+    /**
+     Check if a file is marked as external.
+
+     Also checks for sub-paths of the file, e.g if the folder `docs` is marked as external,
+     then files like `docs/index.html` are also found to be external.
+     - Note: All paths are either relative to root (no leading slash) or absolute paths of the domain (leading slash)
+     */
+    func isExternal(file: String) -> Bool {
+        // Deconstruct file path
+        var path = ""
+        for part in file.components(separatedBy: "/") {
+            guard part != "" else {
+                continue
+            }
+            if path == "" {
+                path = part
+            } else {
+                path += "/" + part
+            }
+            if externalFiles.contains(path) {
+                return true
+            }
+        }
+        return false
+    }
+
+    func printExternalFiles() {
+        guard !externalFiles.isEmpty else {
+            return
+        }
+        print("\(externalFiles.count) external resources needed:")
+        for file in externalFiles.sorted() {
+            print("  " + file)
+        }
+    }
+
+    // MARK: Pages
+
+    func isEmpty(page: String) {
+        emptyPages.insert(page)
+    }
+
+    func printEmptyPages() {
+        guard !emptyPages.isEmpty else {
+            return
+        }
+        print("\(emptyPages.count) empty pages:")
+        for page in emptyPages.sorted() {
+            print("  " + page)
+        }
+    }
+
+    func isDraft(path: String) {
+        draftPages.insert(path)
+    }
+
+    func printDraftPages() {
+        guard !draftPages.isEmpty else {
+            return
+        }
+        print("\(draftPages.count) drafts:")
+        for page in draftPages.sorted() {
+            print("  " + page)
+        }
+    }
+
+    func add(page: String, id: String) {
+        if let existing = pagePaths[id] {
+            log.add(error: "Conflicting id with \(existing)", source: page)
+        }
+        pagePaths[id] = page
+    }
+
+    func getPage(for id: String) -> String? {
+        pagePaths[id]
+    }
+
+    func generated(page: String) {
+        generatedPages.insert(page)
+    }
+
+    func printGeneratedPages() {
+        guard !generatedPages.isEmpty else {
+            print("No pages modified")
+            return
+        }
+        print("\(generatedPages.count) pages modified")
+        for page in generatedPages.sorted() {
+            print("  " + page)
+        }
+    }
+
+
+    // MARK: Writing files
+
+    @discardableResult
+    func writeIfChanged(_ data: Data, to url: URL) -> Bool {
+        // Only write changed files
+        if url.exists, let oldContent = try? Data(contentsOf: url), data == oldContent {
+            return false
+        }
+        do {
+            try data.createFolderAndWrite(to: url)
+            return true
+        } catch {
+            log.add(error: "Failed to write file", source: url.path, error: error)
+            return false
+        }
+    }
+
+    @discardableResult
+    func write(_ string: String, to url: URL) -> Bool {
+        let data = string.data(using: .utf8)!
+        return writeIfChanged(data, to: url)
+    }
+
+    // MARK: Running other tasks
+
+    @discardableResult
+    static func safeShell(_ command: String) throws -> String {
+        let task = Process()
+        let pipe = Pipe()
+
+        task.standardOutput = pipe
+        task.standardError = pipe
+        task.arguments = ["-cl", command]
+        task.executableURL = URL(fileURLWithPath: "/bin/zsh")
+        task.standardInput = nil
+
+        try task.run()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)!
+
+        return output
+    }
+}

Sources/Generator/Files/FileUpdateChecker.swift

@@ -3,9 +3,13 @@ import CryptoKit
 
 final class FileUpdateChecker {
 
-    private let hashesFileName = "hashes.json"
+    private static let hashesFileName = "hashes.json"
 
     private let input: URL
+
+    private var hashesFile: URL {
+        input.appendingPathComponent(FileUpdateChecker.hashesFileName)
+    }
     
     /**
      The hashes of all accessed files from the previous run
@@ -21,41 +25,35 @@ final class FileUpdateChecker {
      */
     private var accessedFiles: [String : Data] = [:]
 
-    var numberOfFilesLoaded: Int {
+    private var source: String {
-        previousFiles.count
+        "FileUpdateChecker"
-    }
-
-    var numberOfFilesAccessed: Int {
-        accessedFiles.count
     }
 
     init(input: URL) {
         self.input = input
-    }
+        guard hashesFile.exists else {
-
+            log.add(info: "No file hashes loaded, regarding all content as new", source: source)
-    enum LoadResult {
+            return
-        case notLoaded
-        case loaded
-        case failed(String)
-    }
-
-    func loadPreviousRun(from folder: URL) -> LoadResult {
-        let url = folder.appendingPathComponent(hashesFileName)
-        guard url.exists else {
-            return .notLoaded
         }
         let data: Data
         do {
-            data = try Data(contentsOf: url)
+            data = try Data(contentsOf: hashesFile)
         } catch {
-            return .failed("Failed to read hashes from last run: \(error)")
+            log.add(
+                warning: "File hashes could not be read, regarding all content as new",
+                source: source,
+                error: error)
+            return
         }
         do {
             self.previousFiles = try JSONDecoder().decode(from: data)
         } catch {
-            return .failed("Failed to decode hashes from last run: \(error)")
+            log.add(
+                warning: "File hashes could not be decoded, regarding all content as new",
+                source: source,
+                error: error)
+            return
         }
-        return .loaded
     }
 
     func fileHasChanged(at path: String) -> Bool {
@@ -75,18 +73,16 @@ final class FileUpdateChecker {
         accessedFiles[path] = SHA256.hash(data: data).data
     }
 
-    func writeDetectedFileChanges(to folder: URL) -> String? {
+
-        let url = folder.appendingPathComponent(hashesFileName)
+    func writeDetectedFileChangesToDisk() {
         do {
             let encoder = JSONEncoder()
             encoder.outputFormatting = .prettyPrinted
             let data = try encoder.encode(accessedFiles)
-            try data.write(to: url)
+            try data.write(to: hashesFile)
-            return nil
         } catch {
-            return "Failed to save file hashes: \(error)"
+            log.add(warning: "Failed to save file hashes", source: source, error: error)
         }
     }
-}
 
-var notFound = 0
+}

Sources/Generator/Files/ImageGenerator.swift

@@ -0,0 +1,456 @@
+import Foundation
+import AppKit
+import CryptoKit
+import Darwin.C
+
+private struct ImageJob {
+
+    let destination: String
+
+    let width: Int
+
+    let path: String
+
+    let quality: Float
+
+    let alwaysGenerate: Bool
+}
+
+final class ImageGenerator {
+
+    private let imageOptimSupportedFileExtensions: Set<String> = ["jpg", "png", "svg"]
+
+    private let imageOptimizationBatchSize = 50
+
+    /**
+     The path to the input folder.
+     */
+    private let input: URL
+
+    /**
+     The path to the output folder
+     */
+    private let output: URL
+
+    /**
+     The images to generate.
+
+     The key is the image source path relative to the input folder, and the values are the destination path (relative to the output folder) and the required image width.
+     */
+    private var imageJobs: [String : [ImageJob]] = [:]
+
+    /**
+     The images for which to generate multiple versions
+
+     The key is the source file, the value is the path of the requiring page.
+     */
+    private var multiImageJobs: [String : String] = [:]
+
+    /**
+     The images which could not be found, but are required for the site.
+
+     The key is the image path, and the value is the page that requires it.
+     */
+    private var missingImages: [String : String] = [:]
+
+    /**
+     All warnings produced for images during generation
+     */
+    private var imageWarnings: Set<String> = []
+
+    /**
+     All images required by the site.
+
+     The values are the destination paths of the images, relative to the output folder
+     */
+    private var requiredImages: Set<String> = []
+
+    /**
+     All images modified or created during this generator run.
+     */
+    private var generatedImages: Set<String> = []
+
+    /**
+     The images optimized by ImageOptim
+     */
+    private var optimizedImages: Set<String> = []
+
+    /**
+     A cache to get the size of source images, so that files don't have to be loaded multiple times.
+
+     The key is the absolute source path, and the value is the image size
+     */
+    private var imageSizeCache: [String : NSSize] = [:]
+
+    private var fileUpdates: FileUpdateChecker
+
+    init(input: URL, output: URL) {
+        self.fileUpdates = FileUpdateChecker(input: input)
+        self.input = input
+        self.output = output
+    }
+
+    func writeDetectedFileChangesToDisk() {
+        fileUpdates.writeDetectedFileChangesToDisk()
+    }
+
+    private func getImageSize(atPath path: String) -> NSSize? {
+        if let size = imageSizeCache[path] {
+            return size
+        }
+        guard let image = getImage(atPath: path) else {
+            return nil
+        }
+        let size = image.size
+        imageSizeCache[path] = size
+        return size
+    }
+
+    private func getImage(atPath path: String) -> NSImage? {
+        guard let data = getData(atPath: path) else {
+            log.add(error: "Failed to load file", source: path)
+            return nil
+        }
+        guard let image = NSImage(data: data) else {
+            log.add(error: "Failed to read image", source: path)
+            return nil
+        }
+        return image
+    }
+
+    private func getData(atPath path: String) -> Data? {
+        let url = input.appendingPathComponent(path)
+        guard url.exists else {
+            return nil
+        }
+        do {
+            let data = try Data(contentsOf: url)
+            fileUpdates.didLoad(data, at: path)
+            return data
+        } catch {
+            log.add(error: "Failed to read data", source: path, error: error)
+            return nil
+        }
+    }
+
+    func requireImage(at destination: String, generatedFrom source: String, requiredBy path: String, quality: Float, width: Int, height: Int?, alwaysGenerate: Bool) -> NSSize {
+        requiredImages.insert(destination)
+        let height = height.unwrapped(CGFloat.init)
+        let sourceUrl = input.appendingPathComponent(source)
+        guard sourceUrl.exists else {
+            missingImages[source] = path
+            return .zero
+        }
+
+        guard let imageSize = getImageSize(atPath: source) else {
+            missingImages[source] = path
+            return .zero
+        }
+        let scaledSize = imageSize.scaledDown(to: CGFloat(width))
+
+        // Check desired height, then we can forget about it
+        if let height = height {
+            let expectedHeight = scaledSize.width / CGFloat(width) * height
+            if abs(expectedHeight - scaledSize.height) > 2 {
+                addWarning("Invalid height (\(scaledSize.height) instead of \(expectedHeight))", destination: destination, path: path)
+            }
+        }
+
+        let job = ImageJob(
+            destination: destination,
+            width: width,
+            path: path,
+            quality: quality,
+            alwaysGenerate: alwaysGenerate)
+        insert(job: job, source: source)
+
+        return scaledSize
+    }
+
+    private func insert(job: ImageJob, source: String) {
+        guard let existingSource = imageJobs[source] else {
+            imageJobs[source] = [job]
+            return
+        }
+
+        guard let existingJob = existingSource.first(where: { $0.destination == job.destination }) else {
+            imageJobs[source] = existingSource + [job]
+            return
+        }
+
+        if existingJob.width != job.width {
+            addWarning("Multiple image widths (\(existingJob.width) and \(job.width))", destination: job.destination, path: "\(existingJob.path) and \(job.path)")
+        }
+    }
+
+    func createImages() {
+        var count = 0
+        for (source, jobs) in imageJobs.sorted(by: { $0.key < $1.key }) {
+            print(String(format: "Creating images: %4d / %d\r", count, imageJobs.count), terminator: "")
+            fflush(stdout)
+            create(images: jobs, from: source)
+            count += 1
+        }
+        print("                                     \r", terminator: "")
+        createMultiImages()
+        optimizeImages()
+        printMissingImages()
+        printImageWarnings()
+        printGeneratedImages()
+        printTotalImageCount()
+    }
+
+    private func printMissingImages() {
+        guard !missingImages.isEmpty else {
+            return
+        }
+        print("\(missingImages.count) missing images:")
+        let sort = missingImages.sorted { (a, b) in
+            a.value < b.value && a.key < b.key
+        }
+        for (source, path) in sort {
+            print("  \(source) (required by \(path))")
+        }
+    }
+
+    private func printImageWarnings() {
+        guard !imageWarnings.isEmpty else {
+            return
+        }
+        print("\(imageWarnings.count) image warnings:")
+        for imageWarning in imageWarnings {
+            print(imageWarning)
+        }
+    }
+
+    private func printGeneratedImages() {
+        guard !generatedImages.isEmpty else {
+            return
+        }
+        print("\(generatedImages.count) images generated:")
+        for image in generatedImages {
+            print("  " + image)
+        }
+    }
+
+    private func printTotalImageCount() {
+        print("\(requiredImages.count) images")
+    }
+
+    private func addWarning(_ message: String, destination: String, path: String) {
+        let warning = "  \(destination): \(message) required by \(path)"
+        imageWarnings.insert(warning)
+    }
+
+    private func addWarning(_ message: String, job: ImageJob) {
+        addWarning(message, destination: job.destination, path: job.path)
+    }
+
+    private func isMissing(_ job: ImageJob) -> Bool {
+        job.alwaysGenerate || !output.appendingPathComponent(job.destination).exists
+    }
+
+    private func create(images: [ImageJob], from source: String) {
+        // Only load image if required
+        let imageHasChanged = fileUpdates.fileHasChanged(at: source)
+        guard imageHasChanged || images.contains(where: isMissing) else {
+            return
+        }
+
+        guard let image = getImage(atPath: source) else {
+            missingImages[source] = images.first?.path
+            return
+        }
+        let jobs = imageHasChanged ? images : images.filter(isMissing)
+        // Update all images
+        jobs.forEach { job in
+            // Prevent memory overflow due to repeated NSImage operations
+            autoreleasepool {
+                create(job: job, from: image, source: source)
+            }
+        }
+    }
+
+    private func create(job: ImageJob, from image: NSImage, source: String) {
+        let destinationUrl = output.appendingPathComponent(job.destination)
+        create(job: job, from: image, source: source, at: destinationUrl)
+    }
+
+    private func create(job: ImageJob, from image: NSImage, source: String, at destinationUrl: URL) {
+
+        // Ensure that image file is supported
+        let ext = destinationUrl.pathExtension.lowercased()
+        guard ImageType(fileExtension: ext) != nil else {
+            fatalError()
+        }
+
+        let destinationExtension = destinationUrl.pathExtension.lowercased()
+        guard let type = ImageType(fileExtension: destinationExtension)?.fileType else {
+            addWarning("Invalid image extension \(destinationExtension)", job: job)
+            return
+        }
+
+        let desiredWidth = CGFloat(job.width)
+
+        let sourceRep = image.representations[0]
+        let destinationSize = NSSize(width: sourceRep.pixelsWide, height: sourceRep.pixelsHigh)
+            .scaledDown(to: desiredWidth)
+
+        // create NSBitmapRep manually, if using cgImage, the resulting size is wrong
+        let rep = NSBitmapImageRep(bitmapDataPlanes: nil,
+                                   pixelsWide: Int(destinationSize.width),
+                                   pixelsHigh: Int(destinationSize.height),
+                                   bitsPerSample: 8,
+                                   samplesPerPixel: 4,
+                                   hasAlpha: true,
+                                   isPlanar: false,
+                                   colorSpaceName: NSColorSpaceName.deviceRGB,
+                                   bytesPerRow: Int(destinationSize.width) * 4,
+                                   bitsPerPixel: 32)!
+
+        let ctx = NSGraphicsContext(bitmapImageRep: rep)
+        NSGraphicsContext.saveGraphicsState()
+        NSGraphicsContext.current = ctx
+        image.draw(in: NSMakeRect(0, 0, destinationSize.width, destinationSize.height))
+        ctx?.flushGraphics()
+        NSGraphicsContext.restoreGraphicsState()
+
+        // Get NSData, and save it
+        guard let data = rep.representation(using: type, properties: [.compressionFactor: NSNumber(value: job.quality)]) else {
+            addWarning("Failed to get data", job: job)
+            return
+        }
+        do {
+            try data.createFolderAndWrite(to: destinationUrl)
+        } catch {
+            addWarning("Failed to write image (\(error))", job: job)
+            return
+        }
+        generatedImages.insert(job.destination)
+    }
+
+    /**
+     Create images of different types.
+
+     This function generates versions for the given image, including png/jpg, avif, and webp. Different pixel density versions (1x and 2x) are also generated.
+     - Parameter destination: The path to the destination file
+     */
+    @discardableResult
+    func requireMultiVersionImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int?) -> NSSize {
+        // Add @1x version
+        _ = requireScaledMultiImage(source: source, destination: destination, requiredBy: path, width: width, desiredHeight: desiredHeight)
+
+        // Add @2x version
+        return requireScaledMultiImage(
+            source: source,
+            destination: destination.insert("@2x", beforeLast: "."),
+            requiredBy: path,
+            width: width * 2,
+            desiredHeight: desiredHeight.unwrapped { $0 * 2 })
+    }
+
+    @discardableResult
+    private func requireScaledMultiImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int?) -> NSSize {
+        let rawDestinationPath = destination.dropAfterLast(".")
+        let avifPath = rawDestinationPath + ".avif"
+        let webpPath = rawDestinationPath + ".webp"
+        let needsGeneration = !output.appendingPathComponent(avifPath).exists || !output.appendingPathComponent(webpPath).exists
+
+        let size = requireImage(at: destination, generatedFrom: source, requiredBy: path, quality: 1.0, width: width, height: desiredHeight, alwaysGenerate: needsGeneration)
+        multiImageJobs[destination] = path
+        return size
+    }
+
+    private func createMultiImages() {
+        let sort = multiImageJobs.sorted { $0.value < $1.value && $0.key < $1.key }
+        var count = 1
+        for (baseImage, path) in sort {
+            print(String(format: "Creating image versions: %4d / %d\r", count, sort.count), terminator: "")
+            fflush(stdout)
+            createMultiImages(from: baseImage, path: path)
+            count += 1
+        }
+        print("                                     \r", terminator: "")
+    }
+
+    private func createMultiImages(from source: String, path: String) {
+        guard generatedImages.contains(source) else {
+            return
+        }
+
+        let sourceUrl = output.appendingPathComponent(source)
+        let sourcePath = sourceUrl.path
+        guard sourceUrl.exists else {
+            addWarning("No image at path \(sourcePath)", destination: source, path: path)
+            missingImages[source] = path
+            return
+        }
+
+        let avifPath = source.dropAfterLast(".") + ".avif"
+        createAVIF(at: output.appendingPathComponent(avifPath).path, from: sourcePath)
+        generatedImages.insert(avifPath)
+
+        let webpPath = source.dropAfterLast(".") + ".webp"
+        createWEBP(at: output.appendingPathComponent(webpPath).path, from: sourcePath)
+        generatedImages.insert(webpPath)
+
+        compress(at: source)
+    }
+
+    private func createAVIF(at destination: String, from source: String, quality: Int = 55, effort: Int = 5) {
+        let folder = destination.dropAfterLast("/")
+        let command = "npx avif --input=\(source) --quality=\(quality) --effort=\(effort) --output=\(folder) --overwrite"
+        do {
+            _ = try FileSystem.safeShell(command)
+        } catch {
+            addWarning("Failed to create AVIF image", destination: destination, path: destination)
+        }
+    }
+
+    private func createWEBP(at destination: String, from source: String, quality: Int = 75) {
+        let command = "cwebp \(source) -q \(quality) -o \(destination)"
+        do {
+            _ = try FileSystem.safeShell(command)
+        } catch {
+            addWarning("Failed to create WEBP image", destination: destination, path: destination)
+        }
+    }
+
+    private func compress(at destination: String, quality: Int = 70) {
+        let command = "magick convert \(destination) -quality \(quality)% \(destination)"
+        do {
+            _ = try FileSystem.safeShell(command)
+        } catch {
+            addWarning("Failed to compress image", destination: destination, path: destination)
+        }
+    }
+
+    private func optimizeImages() {
+        let all = generatedImages
+            .filter { imageOptimSupportedFileExtensions.contains($0.lastComponentAfter(".")) }
+            .map { output.appendingPathComponent($0).path }
+        for i in stride(from: 0, to: all.count, by: imageOptimizationBatchSize) {
+            let endIndex = min(i+imageOptimizationBatchSize, all.count)
+            let batch = all[i..<endIndex]
+            print(String(format: "Optimizing images: %4d / %d\r", endIndex, all.count), terminator: "")
+            fflush(stdout)
+            if optimizeImageBatch(batch) {
+                optimizedImages.formUnion(batch)
+            }
+        }
+        print("                                     \r", terminator: "")
+        fflush(stdout)
+        print("\(optimizedImages.count) images optimized")
+    }
+
+    private func optimizeImageBatch(_ batch: ArraySlice<String>) -> Bool {
+        let command = "imageoptim " + batch.joined(separator: " ")
+        do {
+            _ = try FileSystem.safeShell(command)
+            return true
+        } catch {
+            addWarning("Failed to optimize images", destination: "", path: "")
+            return false
+        }
+    }
+}

Sources/Generator/Files/ImageJob.swift

@@ -1,14 +0,0 @@
-import Foundation
-
-struct ImageJob {
-
-    let destination: String
-
-    let width: Int
-
-    let path: String
-
-    let quality: Float
-
-    let alwaysGenerate: Bool
-}

Sources/Generator/Files/ImageReader.swift

@@ -1,66 +0,0 @@
-import Foundation
-import AppKit
-
-final class ImageReader {
-
-    /// The content folder where the input data is stored
-    let contentFolder: URL
-
-    private let fileUpdates: FileUpdateChecker
-
-    let runDataFolder: URL
-
-    init(in input: URL, runFolder: URL, fileUpdates: FileUpdateChecker) {
-        self.contentFolder = input
-        self.runDataFolder = runFolder
-        self.fileUpdates = fileUpdates
-    }
-
-    var numberOfFilesLoaded: Int {
-        fileUpdates.numberOfFilesLoaded
-    }
-
-    var numberOfFilesAccessed: Int {
-        fileUpdates.numberOfFilesAccessed
-    }
-
-    func loadData() -> FileUpdateChecker.LoadResult {
-        fileUpdates.loadPreviousRun(from: runDataFolder)
-    }
-
-    func writeDetectedFileChangesToDisk() -> String? {
-        fileUpdates.writeDetectedFileChanges(to: runDataFolder)
-    }
-
-    func imageHasChanged(at path: String) -> Bool {
-        fileUpdates.fileHasChanged(at: path)
-    }
-
-    func getImage(atPath path: String) -> NSImage? {
-        guard let data = getData(atPath: path) else {
-            // TODO: log.error("Failed to load file", source: path)
-            return nil
-        }
-        guard let image = NSImage(data: data) else {
-            // TODO: log.error("Failed to read image", source: path)
-            return nil
-        }
-        return image
-    }
-
-    private func getData(atPath path: String) -> Data? {
-        let url = contentFolder.appendingPathComponent(path)
-        guard url.exists else {
-            return nil
-        }
-        do {
-            let data = try Data(contentsOf: url)
-            fileUpdates.didLoad(data, at: path)
-            return data
-        } catch {
-            // TODO: log.error("Failed to read data: \(error)", source: path)
-            return nil
-        }
-    }
-
-}

Sources/Generator/Generators/OverviewPageGenerator.swift

@@ -4,17 +4,15 @@ struct OverviewPageGenerator {
 
     private let factory: LocalizedSiteTemplate
 
-    private let results: GenerationResultsHandler
+    init(factory: LocalizedSiteTemplate) {
-
-    init(factory: LocalizedSiteTemplate, results: GenerationResultsHandler) {
         self.factory = factory
-        self.results = results
     }
 
     func generate(
         section: Element,
         language: String) {
             let path = section.localizedPath(for: language)
+            let url = files.urlInOutputFolder(path)
 
             let metadata = section.localized(for: language)
 
@@ -28,8 +26,11 @@ struct OverviewPageGenerator {
             content[.contentClass] = "overview"
             content[.header] = makeHeader(page: section, metadata: metadata, language: language)
             content[.content] = makeContent(section: section, language: language)
-            content[.footer] = results.getContentOfOptionalFile(at: section.additionalFooterContentPath, source: section.path)
+            content[.footer] = section.customFooterContent()
-            factory.page.generate(content, to: path, source: section.path)
+            guard factory.page.generate(content, to: url) else {
+                return
+            }
+            files.generated(page: path)
     }
 
     private func makeContent(section: Element, language: String) -> String {

Sources/Generator/Generators/OverviewSectionGenerator.swift

@@ -8,10 +8,10 @@ struct OverviewSectionGenerator {
 
     private let generator: ThumbnailListGenerator
 
-    init(factory: TemplateFactory, results: GenerationResultsHandler) {
+    init(factory: TemplateFactory) {
         self.multipleSectionsTemplate = factory.overviewSection
         self.singleSectionsTemplate = factory.overviewSectionClean
-        self.generator = ThumbnailListGenerator(factory: factory, results: results)
+        self.generator = ThumbnailListGenerator(factory: factory)
     }
 
     func generate(sections: [Element], in parent: Element, language: String, sectionItemCount: Int) -> String {
@@ -25,13 +25,8 @@ struct OverviewSectionGenerator {
     }
 
     private func newsSectionContent(for element: Element, language: String, sectionItemCount: Int) -> String {
-        // let shownElements = element.mostRecentElements(sectionItemCount)
+        let shownElements = element.mostRecentElements(sectionItemCount)
         return ""
-//        return generator.generateContent(
-//            items: shownElements,
-//            parent: element,
-//            language: language,
-//            style: element.thumbnailStyle)
     }
 
     private func sectionsContent(_ sections: [Element], in parent: Element, language: String, sectionItemCount: Int) -> String {

Sources/Generator/Generators/PageContentGenerator.swift

@@ -10,12 +10,9 @@ struct PageContentGenerator {
 
     private let siteRoot: Element
 
-    private let results: GenerationResultsHandler
+    init(factory: TemplateFactory, siteRoot: Element) {
-
-    init(factory: TemplateFactory, siteRoot: Element, results: GenerationResultsHandler) {
         self.factory = factory
         self.siteRoot = siteRoot
-        self.results = results
     }
 
     func generate(page: Element, language: String, content: String) -> (content: String, includesCode: Bool) {
@@ -47,7 +44,8 @@ struct PageContentGenerator {
         let file = markdown.between("(", and: ")")
         if file.hasPrefix("page:") {
             let pageId = file.replacingOccurrences(of: "page:", with: "")
-            guard let pagePath = results.getPagePath(for: pageId, source: page.path) else {
+            guard let pagePath = files.getPage(for: pageId) else {
+                log.add(warning: "Page id '\(pageId)' not found", source: page.path)
                 // Remove link since the page can't be found
                 return markdown.between("[", and: "]")
             }
@@ -59,13 +57,13 @@ struct PageContentGenerator {
 
         if let filePath = page.nonAbsolutePathRelativeToRootForContainedInputFile(file) {
             // The target of the page link must be present after generation is complete
-            results.expect(file: filePath, source: page.path)
+            files.expect(file: filePath, source: page.path)
         }
         return html
     }
 
     private func handleHTML(page: Element, language: String, html: String, markdown: Substring) -> String {
-        // TODO: Check HTML code in markdown for required resources
+        #warning("Check HTML code in markdown for required resources")
         //print("[HTML] Found in page \(page.path):")
         //print(markdown)
         // Things to check:
@@ -125,7 +123,7 @@ struct PageContentGenerator {
     private func handleImage(page: Element, file: String, rightTitle: String?, leftTitle: String?) -> String {
         let imagePath = page.pathRelativeToRootForContainedInputFile(file)
 
-        let size = results.requireFullSizeMultiVersionImage(
+        let size = files.requireFullSizeMultiVersionImage(
             source: imagePath,
             destination: imagePath,
             requiredBy: page.path)
@@ -142,28 +140,28 @@ struct PageContentGenerator {
 
     private func handleVideo(page: Element, file: String, optionString: String?) -> String {
         let options: [PageVideoTemplate.VideoOption] = optionString.unwrapped { string in
-            string.components(separatedBy: " ").compactMap { optionText -> PageVideoTemplate.VideoOption? in
+            string.components(separatedBy: " ").compactMap { optionText in
                 guard let optionText = optionText.trimmed.nonEmpty else {
                     return nil
                 }
                 guard let option = PageVideoTemplate.VideoOption(rawValue: optionText) else {
-                    results.warning("Unknown video option \(optionText)", source: page.path)
+                    log.add(warning: "Unknown video option \(optionText)", source: page.path)
                     return nil
                 }
                 return option
             }
         } ?? []
-        // TODO: Check page folder for alternative video versions
+        #warning("Check page folder for alternative video versions")
         let sources: [PageVideoTemplate.VideoSource] = [(url: file, type: .mp4)]
 
         let filePath = page.pathRelativeToRootForContainedInputFile(file)
-        results.require(file: filePath, source: page.path)
+        files.require(file: filePath)
         return factory.video.generate(sources: sources, options: options)
     }
 
     private func handleSvg(page: Element, file: String, area: String?) -> String {
         let imagePath = page.pathRelativeToRootForContainedInputFile(file)
-        results.require(file: imagePath, source: page.path)
+        files.require(file: imagePath)
 
         guard let area = area else {
             return factory.html.svgImage(file: file)
@@ -174,7 +172,7 @@ struct PageContentGenerator {
               let y = Int(parts[1].trimmed),
               let width = Int(parts[2].trimmed),
               let height = Int(parts[3].trimmed) else {
-            results.warning("Invalid area string for svg image", source: page.path)
+            log.add(warning: "Invalid area string for svg image", source: page.path)
             return factory.html.svgImage(file: file)
         }
 
@@ -182,7 +180,7 @@ struct PageContentGenerator {
     }
 
     private func handleFile(page: Element, file: String, fileExtension: String) -> String {
-        results.warning("Unhandled file \(file) with extension \(fileExtension)", source: page.path)
+        log.add(warning: "Unhandled file \(file) with extension \(fileExtension)", source: page.path)
         return ""
     }
 
@@ -192,7 +190,7 @@ struct PageContentGenerator {
             .compactMap { button -> (file: String, text: String, downloadName: String?)? in
                 let parts = button.components(separatedBy: ",")
                 guard parts.count == 2 || parts.count == 3 else {
-                    results.warning("Invalid button definition", source: page.path)
+                    log.add(warning: "Invalid button definition", source: page.path)
                     return nil
                 }
                 let file = parts[0].trimmed
@@ -201,7 +199,7 @@ struct PageContentGenerator {
 
                 // Ensure that file is available
                 let filePath = page.pathRelativeToRootForContainedInputFile(file)
-                results.require(file: filePath, source: page.path)
+                files.require(file: filePath)
 
                 return (file, title, downloadName)
             }
@@ -214,7 +212,7 @@ struct PageContentGenerator {
             .compactMap { button -> (url: String, text: String)? in
                 let parts = button.components(separatedBy: ",")
                 guard parts.count == 2 else {
-                    results.warning("Invalid external link definition", source: page.path)
+                    log.add(warning: "Invalid external link definition", source: page.path)
                     return nil
                 }
                 let url = parts[0].trimmed
@@ -226,14 +224,23 @@ struct PageContentGenerator {
     }
 
     private func handleExternalHTML(page: Element, file: String) -> String {
-        let path = page.pathRelativeToRootForContainedInputFile(file)
+        let url = page.inputFolder.appendingPathComponent(file)
-        return results.getContentOfRequiredFile(at: path, source: page.path) ?? ""
+        guard url.exists else {
+            log.add(error: "File \(file) not found", source: page.path)
+            return ""
+        }
+        do {
+            return try String(contentsOf: url)
+        } catch {
+            log.add(error: "File \(file) could not be read", source: page.path, error: error)
+            return ""
+        }
     }
 
     private func handleSimpleBox(page: Element, content: String) -> String {
         let parts = content.components(separatedBy: ";")
         guard parts.count > 1 else {
-            results.warning("Invalid box specification", source: page.path)
+            log.add(error: "Invalid box specification", source: page.path)
             return ""
         }
         let title = parts[0]
@@ -243,8 +250,7 @@ struct PageContentGenerator {
 
     private func handlePageLink(page: Element, language: String, pageId: String) -> String {
         guard let linkedPage = siteRoot.find(pageId) else {
-            // Checking the page path will add it to the missing pages
+            log.add(warning: "Page id '\(pageId)' not found", source: page.path)
-            _ = results.getPagePath(for: pageId, source: page.path)
             // Remove link since the page can't be found
             return ""
         }
@@ -253,7 +259,6 @@ struct PageContentGenerator {
         content[.title] = linkedPage.title(for: language)
 
         let fullThumbnailPath = linkedPage.thumbnailFilePath(for: language).destination
-        // Note: Here we assume that the thumbnail was already used elsewhere, so already generated
         let relativeImageUrl = page.relativePathToOtherSiteElement(file: fullThumbnailPath)
         let metadata = linkedPage.localized(for: language)
 

Sources/Generator/Generators/PageGenerator.swift

@@ -7,24 +7,20 @@ struct PageGenerator {
 
     private let contentGenerator: PageContentGenerator
 
-    private let results: GenerationResultsHandler
+    init(factory: LocalizedSiteTemplate, siteRoot: Element) {
-
-    init(factory: LocalizedSiteTemplate, siteRoot: Element, results: GenerationResultsHandler) {
         self.factory = factory
-        self.results = results
+        self.contentGenerator = PageContentGenerator(factory: factory.factory, siteRoot: siteRoot)
-        self.contentGenerator = PageContentGenerator(factory: factory.factory, siteRoot: siteRoot, results: results)
     }
 
     func generate(page: Element, language: String, previousPage: Element?, nextPage: Element?) {
         guard !page.isExternalPage else {
-            results.didCompletePage()
             return
         }
         let path = page.fullPageUrl(for: language)
         let inputContentPath = page.path + "/\(language).md"
         let metadata = page.localized(for: language)
         let nextLanguage = page.nextLanguage(for: language)
-        let (pageContent, pageIncludesCode) = makeContent(
+        let (pageContent, pageIncludesCode, pageIsEmpty) = makeContent(
             page: page, metadata: metadata, language: language, path: inputContentPath)
 
         var content = [PageTemplate.Key : String]()
@@ -39,17 +35,23 @@ struct PageGenerator {
         content[.previousPageUrl] = navLink(from: page, to: previousPage, language: language)
         content[.nextPageLinkText] = nextText(for: nextPage, language: language)
         content[.nextPageUrl] = navLink(from: page, to: nextPage, language: language)
-        content[.footer] = results.getContentOfOptionalFile(at: page.additionalFooterContentPath, source: page.path)
+        content[.footer] = page.customFooterContent()
 
         if pageIncludesCode {
             let highlightCode = factory.factory.html.codeHighlightFooter()
             content[.footer] = (content[.footer].unwrapped { $0 + "\n" } ?? "") + highlightCode
         }
 
+        let url = files.urlInOutputFolder(path)
         if page.state == .draft {
-            results.markPageAsDraft(page: page.path)
+            files.isDraft(path: page.path)
+        } else if pageIsEmpty, page.state != .hidden {
+            files.isEmpty(page: path)
         }
-        factory.page.generate(content, to: path, source: page.path)
+        guard factory.page.generate(content, to: url) else {
+            return
+        }
+        files.generated(page: path)
     }
 
     private func navLink(from element: Element, to destination: Element?, language: String) -> String? {
@@ -73,14 +75,14 @@ struct PageGenerator {
         return factory.factory.html.makeNextText(text)
     }
 
-    private func makeContent(page: Element, metadata: Element.LocalizedMetadata, language: String, path: String) -> (content: String, includesCode: Bool) {
+    private func makeContent(page: Element, metadata: Element.LocalizedMetadata, language: String, path: String) -> (content: String, includesCode: Bool, isEmpty: Bool) {
-        if let raw = results.getContentOfMdFile(at: path, source: page.path)?.trimmed.nonEmpty {
+        if let raw = files.contentOfMdFile(atPath: path, source: page.path)?.trimmed.nonEmpty {
             let (content, includesCode) = contentGenerator.generate(page: page, language: language, content: raw)
-            return (content, includesCode)
+            return (content, includesCode, false)
         } else {
             let (content, includesCode) = contentGenerator.generate(page: page, language: language, content: metadata.placeholderText)
             let placeholder = factory.factory.makePlaceholder(title: metadata.placeholderTitle, text: content)
-            return (placeholder, includesCode)
+            return (placeholder, includesCode, true)
         }
     }
 

Sources/Generator/Generators/PageHeadGenerator.swift

@@ -2,16 +2,12 @@ import Foundation
 
 struct PageHeadGenerator {
 
-    // TODO: Add to configuration
     static let linkPreviewDesiredImageWidth = 1600
 
     let factory: TemplateFactory
 
-    private let results: GenerationResultsHandler
+    init(factory: TemplateFactory) {
-
-    init(factory: TemplateFactory, results: GenerationResultsHandler) {
         self.factory = factory
-        self.results = results
     }
 
     func generate(page: Element, language: String, includesCode: Bool = false) -> String {
@@ -28,14 +24,14 @@ struct PageHeadGenerator {
             let linkPreviewImageName = "thumbnail-link.\(image.lastComponentAfter("."))"
             let sourceImagePath = page.pathRelativeToRootForContainedInputFile(image)
             let destinationImagePath = page.pathRelativeToRootForContainedInputFile(linkPreviewImageName)
-            results.requireSingleImage(
+            files.requireSingleImage(
                 source: sourceImagePath,
                 destination: destinationImagePath,
                 requiredBy: page.path,
                 width: PageHeadGenerator.linkPreviewDesiredImageWidth)
             content[.image] =  factory.html.linkPreviewImage(file: linkPreviewImageName)
         }
-        content[.customPageContent] = results.getContentOfOptionalFile(at: page.additionalHeadContentPath, source: page.path)
+        content[.customPageContent] = page.customHeadContent()
         if includesCode {
             let scriptPath = "assets/js/highlight.js"
             let relative = page.relativePathToOtherSiteElement(file: scriptPath)

Sources/Generator/Generators/SiteGenerator.swift

@@ -6,12 +6,9 @@ struct SiteGenerator {
 
     let templates: TemplateFactory
 
-    let results: GenerationResultsHandler
+    init() throws {
-
+        let templatesFolder = files.urlInContentFolder("templates")
-    init(results: GenerationResultsHandler) throws {
+        self.templates = try TemplateFactory(templateFolder: templatesFolder)
-        self.results = results
-        let templatesFolder = results.contentFolder.appendingPathComponent("templates")
-        self.templates = try TemplateFactory(templateFolder: templatesFolder, results: results)
     }
 
     func generate(site: Element) {
@@ -25,12 +22,11 @@ struct SiteGenerator {
         let template = LocalizedSiteTemplate(
             factory: templates,
             language: language,
-            site: site,
+            site: site)
-            results: results)
 
         // Generate sections
-        let overviewGenerator = OverviewPageGenerator(factory: template, results: results)
+        let overviewGenerator = OverviewPageGenerator(factory: template)
-        let pageGenerator = PageGenerator(factory: template, siteRoot: site, results: results)
+        let pageGenerator = PageGenerator(factory: template, siteRoot: site)
         
         var elementsToProcess: [LinkedElement] = [(nil, site, nil)]
         while let (previous, element, next) = elementsToProcess.popLast() {
@@ -38,6 +34,7 @@ struct SiteGenerator {
             elementsToProcess.append(contentsOf: element.linkedElements)
 
             processAllFiles(for: element)
+
             if !element.elements.isEmpty {
                 overviewGenerator.generate(section: element, language: language)
             } else {
@@ -51,10 +48,10 @@ struct SiteGenerator {
     }
 
     private func processAllFiles(for element: Element) {
-        element.externalFiles.forEach { results.exclude(file: $0, source: element.path) }
+        element.requiredFiles.forEach(files.require)
-        element.requiredFiles.forEach { results.require(file: $0, source: element.path) }
+        element.externalFiles.forEach(files.exclude)
         element.images.forEach {
-            results.requireSingleImage(
+            files.requireSingleImage(
                 source: $0.sourcePath,
                 destination: $0.destinationPath,
                 requiredBy: element.path,

Sources/Generator/Generators/ThumbnailListGenerator.swift

@@ -4,11 +4,8 @@ struct ThumbnailListGenerator {
 
     private let factory: TemplateFactory
 
-    private let results: GenerationResultsHandler
+    init(factory: TemplateFactory) {
-
-    init(factory: TemplateFactory, results: GenerationResultsHandler) {
         self.factory = factory
-        self.results = results
     }
 
     func generateContent(items: [Element], parent: Element, language: String, style: ThumbnailStyle) -> String {
@@ -40,7 +37,7 @@ struct ThumbnailListGenerator {
             factory.largeThumbnail.makeCorner(text: $0)
         }
 
-        results.requireMultiVersionImage(
+        files.requireMultiVersionImage(
             source: thumbnailSourcePath,
             destination: thumbnailDestNoExtension + ".jpg",
             requiredBy: item.path,

Sources/Generator/Processing/FileData.swift

@@ -1,20 +0,0 @@
-import Foundation
-
-struct FileData {
-
-    ///The files marked as expected, i.e. they exist after the generation is completed. (`key`: file path, `value`: the file providing the link)
-    var expected: [String : String] = [:]
-
-    /// All files which should be copied to the output folder (`key`: The file path, `value`: The source requiring the file)
-    var toCopy: [String : String] = [:]
-
-    /// The files to minify when copying into output directory. (`key`: the file path relative to the content folder)
-    var toMinify: [String : (source: String, type: MinificationType)] = [:]
-
-    /**
-     The files marked as external in element metadata. (Key: File path, Value: source element)
-
-     Files included here are not generated, since they are assumed to be added separately.
-     */
-    var external: [String : String] = [:]
-}

Sources/Generator/Processing/FileGenerator.swift

@@ -1,286 +0,0 @@
-import Foundation
-
-final class FileGenerator {
-
-    let input: URL
-
-    let outputFolder: URL
-
-    let runFolder: URL
-
-    private let files: FileData
-
-    /// All files copied to the destination.
-    private var copiedFiles: Set<String> = []
-
-    /// Files which could not be read (`key`: file path relative to content)
-    private var unreadableFiles: [String : (source: String, message: String)] = [:]
-
-    /// Files which could not be written (`key`: file path relative to output folder)
-    private var unwritableFiles: [String : (source: String, message: String)] = [:]
-
-    private var failedMinifications: [(file: String, source: String, message: String)] = []
-
-    /// Non-existent files. `key`: file path, `value`: source element
-    private var missingFiles: [String : String] = [:]
-
-    private var minifiedFiles: [String] = []
-
-    private let numberOfFilesToCopy: Int
-
-    private var numberOfCopiedFiles = 0
-
-    private let numberOfFilesToMinify: Int
-
-    private var numberOfMinifiedFiles = 0
-
-    private var numberOfExistingFiles = 0
-
-    private var tempFile: URL {
-        runFolder.appendingPathComponent("temp")
-    }
-
-    init(input: URL, output: URL, runFolder: URL, files: FileData) {
-        self.input = input
-        self.outputFolder = output
-        self.runFolder = runFolder
-        self.files = files
-
-        numberOfFilesToCopy = files.toCopy.count
-        numberOfFilesToMinify = files.toMinify.count
-    }
-
-    func generate() {
-        copy(files: files.toCopy)
-        print("          Copied files: \(copiedFiles.count)/\(numberOfFilesToCopy)       ")
-        minify(files: files.toMinify)
-        print("        Minified files: \(minifiedFiles.count)/\(numberOfFilesToMinify)     ")
-        checkExpected(files: files.expected)
-        print("        Expected files: \(numberOfExistingFiles)/\(files.expected.count)")
-        print("        External files: \(files.external.count)")
-        print("")
-    }
-
-    func writeResultsToFile(file: URL) throws {
-        var lines: [String] = []
-        func add<S>(_ name: String, _ property: S, convert: (S.Element) -> String) where S: Sequence {
-            let elements = property.map { "  " + convert($0) }.sorted()
-            guard !elements.isEmpty else {
-                return
-            }
-            lines.append("\(name):")
-            lines.append(contentsOf: elements)
-        }
-        add("Missing files", missingFiles) { "\($0.key) (required by \($0.value))" }
-        add("Unreadable files", unreadableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Unreadable files", unreadableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Unwritable files", unwritableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("External files", files.external) { "\($0.key) (from \($0.value))" }
-
-        let data = lines.joined(separator: "\n").data(using: .utf8)!
-        try data.createFolderAndWrite(to: file)
-    }
-
-    private func didCopyFile() {
-        numberOfCopiedFiles += 1
-        print("          Copied files: \(numberOfCopiedFiles)/\(numberOfFilesToCopy)   \r", terminator: "")
-        fflush(stdout)
-    }
-
-    private func didMinifyFile() {
-        numberOfMinifiedFiles += 1
-        print("        Minified files: \(numberOfMinifiedFiles)/\(numberOfFilesToMinify)    \r", terminator: "")
-        fflush(stdout)
-    }
-
-    // MARK: File copies
-
-    private func copy(files: [String : String]) {
-        for (file, source) in files {
-            copyFileIfChanged(file: file, source: source)
-        }
-    }
-
-    private func copyFileIfChanged(file: String, source: String) {
-        let cleanPath = cleanRelativeURL(file)
-        let destinationUrl = outputFolder.appendingPathComponent(cleanPath)
-
-        defer { didCopyFile() }
-        guard copyIfChanged(cleanPath, to: destinationUrl, source: source) else {
-            return
-        }
-        copiedFiles.insert(cleanPath)
-    }
-
-    private func copyIfChanged(_ file: String, to destination: URL, source: String) -> Bool {
-        let url = input.appendingPathComponent(file)
-        do {
-            let data = try Data(contentsOf: url)
-            return writeIfChanged(data, file: file, source: source)
-        } catch {
-            markFileAsUnreadable(at: file, requiredBy: source, message: "\(error)")
-            return false
-        }
-    }
-
-    @discardableResult
-    func writeIfChanged(_ data: Data, file: String, source: String) -> Bool {
-        let url = outputFolder.appendingPathComponent(file)
-        // Only write changed files
-        if url.exists, let oldContent = try? Data(contentsOf: url), data == oldContent {
-            return false
-        }
-        do {
-            try data.createFolderAndWrite(to: url)
-            return true
-        } catch {
-            markFileAsUnwritable(at: file, requiredBy: source, message: "Failed to write file: \(error)")
-            return false
-        }
-    }
-
-    // MARK: File minification
-
-    private func minify(files: [String : (source: String, type: MinificationType)]) {
-        for (file, other) in files {
-            minify(file: file, source: other.source, type: other.type)
-        }
-    }
-
-    private func minify(file: String, source: String, type: MinificationType) {
-        let url = input.appendingPathComponent(file)
-        let command: String
-        switch type {
-        case .js:
-            command = "uglifyjs \(url.path) > \(tempFile.path)"
-        case .css:
-            command = "cleancss \(url.path) -o \(tempFile.path)"
-        }
-
-        defer {
-            didMinifyFile()
-            try? tempFile.delete()
-        }
-
-        let output: String
-        do {
-            output = try safeShell(command)
-        } catch {
-            failedMinifications.append((file, source, "Failed to minify with error: \(error)"))
-            return
-        }
-        guard tempFile.exists else {
-            failedMinifications.append((file, source, output))
-            return
-        }
-        let data: Data
-        do {
-            data = try Data(contentsOf: tempFile)
-        } catch {
-            markFileAsUnreadable(at: file, requiredBy: source, message: "\(error)")
-            return
-        }
-        if writeIfChanged(data, file: file, source: source) {
-            minifiedFiles.append(file)
-        }
-    }
-
-
-    private func cleanRelativeURL(_ raw: String) -> String {
-        let raw = raw.dropAfterLast("#") // Clean links to page content
-        guard raw.contains("..") else {
-            return raw
-        }
-        var result: [String] = []
-        for component in raw.components(separatedBy: "/") {
-            if component == ".." {
-                _ = result.popLast()
-            } else {
-                result.append(component)
-            }
-        }
-        return result.joined(separator: "/")
-    }
-
-    private func markFileAsUnreadable(at path: String, requiredBy source: String, message: String) {
-        unreadableFiles[path] = (source, message)
-    }
-
-    private func markFileAsUnwritable(at path: String, requiredBy source: String, message: String) {
-        unwritableFiles[path] = (source, message)
-    }
-
-    // MARK: File expectationts
-
-    private func checkExpected(files: [String: String]) {
-        for (file, source) in files {
-            guard !isExternal(file: file) else {
-                numberOfExistingFiles += 1
-                continue
-            }
-            let cleanPath = cleanRelativeURL(file)
-            let destinationUrl = outputFolder.appendingPathComponent(cleanPath)
-            guard destinationUrl.exists else {
-                markFileAsMissing(at: cleanPath, requiredBy: source)
-                continue
-            }
-            numberOfExistingFiles += 1
-        }
-    }
-
-    private func markFileAsMissing(at path: String, requiredBy source: String) {
-        missingFiles[path] = source
-    }
-
-    /**
-     Check if a file is marked as external.
-
-     Also checks for sub-paths of the file, e.g if the folder `docs` is marked as external,
-     then files like `docs/index.html` are also found to be external.
-     - Note: All paths are either relative to root (no leading slash) or absolute paths of the domain (leading slash)
-     */
-    private func isExternal(file: String) -> Bool {
-        // Deconstruct file path
-        var path = ""
-        for part in file.components(separatedBy: "/") {
-            guard part != "" else {
-                continue
-            }
-            if path == "" {
-                path = part
-            } else {
-                path += "/" + part
-            }
-            if files.external[path] != nil {
-                return true
-            }
-        }
-        return false
-    }
-
-    func writeResults(to file: URL) {
-        var lines: [String] = []
-        func add<S>(_ name: String, _ property: S, convert: (S.Element) -> String) where S: Sequence {
-            let elements = property.map { "  " + convert($0) }.sorted()
-            guard !elements.isEmpty else {
-                return
-            }
-            lines.append("\(name):")
-            lines.append(contentsOf: elements)
-        }
-        add("Unreadable files", unreadableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Unwritable files", unwritableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Failed minifications", failedMinifications) { "\($0.file) (required by \($0.source)): \($0.message)" }
-        add("Missing files", missingFiles) { "\($0.key) (required by \($0.value))" }
-        add("Copied files", copiedFiles) { $0 }
-        add("Minified files", minifiedFiles) { $0 }
-        add("Expected files", files.expected) { "\($0.key) (required by \($0.value))" }
-
-        let data = lines.joined(separator: "\n").data(using: .utf8)!
-        do {
-            try data.createFolderAndWrite(to: file)
-        } catch {
-            print("    Failed to save log: \(error)")
-        }
-    }
-}

Sources/Generator/Processing/GenerationResultsHandler.swift

@@ -1,470 +0,0 @@
-import Foundation
-import CryptoKit
-import AppKit
-
-
-enum MinificationType {
-    case js
-    case css
-}
-
-final class GenerationResultsHandler {
-
-    /// The content folder where the input data is stored
-    let contentFolder: URL
-
-    /// The folder where the site is generated
-    let outputFolder: URL
-
-    private let fileUpdates: FileUpdateChecker
-
-    /**
-     All paths to page element folders, indexed by their unique id.
-
-     This relation is used to generate relative links to pages using the ``Element.id`
-     */
-    private let pagePaths: [String: String]
-
-    private let configuration: Configuration
-
-    private var numberOfProcessedPages = 0
-
-    private let numberOfTotalPages: Int
-
-    init(in input: URL, to output: URL, configuration: Configuration, fileUpdates: FileUpdateChecker, pagePaths: [String: String], pageCount: Int) {
-        self.contentFolder = input
-        self.fileUpdates = fileUpdates
-        self.outputFolder = output
-        self.pagePaths = pagePaths
-        self.configuration = configuration
-        self.numberOfTotalPages = pageCount
-    }
-
-    // MARK: Internal storage
-
-    /// Non-existent files. `key`: file path, `value`: source element
-    private var missingFiles: [String : String] = [:]
-
-    private(set) var files = FileData()
-
-    /// Files which could not be read (`key`: file path relative to content)
-    private var unreadableFiles: [String : (source: String, message: String)] = [:]
-
-    /// Files which could not be written (`key`: file path relative to output folder)
-    private var unwritableFiles: [String : (source: String, message: String)] = [:]
-
-    /// The paths to all files which were changed (relative to output)
-    private var generatedFiles: Set<String> = []
-
-    /// The referenced pages which do not exist (`key`: page id, `value`: source element path)
-    private var missingLinkedPages: [String : String] = [:]
-
-    /// All pages without content which have been created (`key`: page path, `value`: source element path)
-    private var emptyPages: [String : String] = [:]
-
-    /// All pages which have `status` set to ``PageState.draft``
-    private var draftPages: Set<String> = []
-
-    /// Generic warnings for pages
-    private var pageWarnings: [(message: String, source: String)] = []
-
-    /// A cache to get the size of source images, so that files don't have to be loaded multiple times (`key` absolute source path, `value`: image size)
-    private var imageSizeCache: [String : NSSize] = [:]
-
-    private(set) var images = ImageData()
-
-    // MARK: Generic warnings
-
-    private func warning(_ message: String, destination: String, path: String) {
-        let warning = "  \(destination): \(message) required by \(path)"
-        images.warnings.append(warning)
-    }
-
-    func warning(_ message: String, source: String) {
-        pageWarnings.append((message, source))
-    }
-
-    // MARK: Page data
-
-    func getPagePath(for id: String, source: String) -> String? {
-        guard let pagePath = pagePaths[id] else {
-            missingLinkedPages[id] = source
-            return nil
-        }
-        return pagePath
-    }
-
-    private func markPageAsEmpty(page: String, source: String) {
-        emptyPages[page] = source
-    }
-
-    func markPageAsDraft(page: String) {
-        draftPages.insert(page)
-    }
-
-    // MARK: File actions
-
-    /**
-     Add a file as required, so that it will be copied to the output directory.
-     Special files may be minified.
-     - Parameter file: The file path, relative to the content directory
-     - Parameter source: The path of the source element requiring the file.
-     */
-    func require(file: String, source: String) {
-        guard !isExternal(file: file) else {
-            return
-        }
-        let url = contentFolder.appendingPathComponent(file)
-        guard url.exists else {
-            markFileAsMissing(at: file, requiredBy: source)
-            return
-        }
-        guard url.isDirectory else {
-            markForCopyOrMinification(file: file, source: source)
-            return
-        }
-        do {
-            try FileManager.default
-                .contentsOfDirectory(atPath: url.path)
-                .forEach {
-                    // Recurse into subfolders
-                    require(file: file + "/" + $0, source: source)
-                }
-        } catch {
-            markFileAsUnreadable(at: file, requiredBy: source, message: "Failed to read folder: \(error)")
-        }
-    }
-
-    private func markFileAsMissing(at path: String, requiredBy source: String) {
-        missingFiles[path] = source
-    }
-
-    private func markFileAsUnreadable(at path: String, requiredBy source: String, message: String) {
-        unreadableFiles[path] = (source, message)
-    }
-
-    private func markFileAsUnwritable(at path: String, requiredBy source: String, message: String) {
-        unwritableFiles[path] = (source, message)
-    }
-
-    private func markFileAsGenerated(file: String) {
-        generatedFiles.insert(file)
-    }
-
-    private func markForCopyOrMinification(file: String, source: String) {
-        let ext = file.lastComponentAfter(".")
-        if configuration.minifyCSSandJS, ext == "js" {
-            files.toMinify[file] = (source, .js)
-            return
-        }
-        if configuration.minifyCSSandJS, ext == "css" {
-            files.toMinify[file] = (source, .css)
-            return
-        }
-        files.toCopy[file] = source
-    }
-
-    /**
-     Mark a file as explicitly missing (external).
-
-     This is done for the `externalFiles` entries in metadata,
-     to indicate that these files will be copied to the output folder manually.
-     */
-    func exclude(file: String, source: String) {
-        files.external[file] = source
-    }
-
-    /**
-     Mark a file as expected to be present in the output folder after generation.
-
-     This is done for all links between pages, which only exist after the pages have been generated.
-     */
-    func expect(file: String, source: String) {
-        files.expected[file] = source
-    }
-
-    /**
-     Check if a file is marked as external.
-
-     Also checks for sub-paths of the file, e.g if the folder `docs` is marked as external,
-     then files like `docs/index.html` are also found to be external.
-     - Note: All paths are either relative to root (no leading slash) or absolute paths of the domain (leading slash)
-     */
-    private func isExternal(file: String) -> Bool {
-        // Deconstruct file path
-        var path = ""
-        for part in file.components(separatedBy: "/") {
-            guard part != "" else {
-                continue
-            }
-            if path == "" {
-                path = part
-            } else {
-                path += "/" + part
-            }
-            if files.external[path] != nil {
-                return true
-            }
-        }
-        return false
-    }
-
-    func getContentOfRequiredFile(at path: String, source: String) -> String? {
-        let url = contentFolder.appendingPathComponent(path)
-        guard url.exists else {
-            markFileAsMissing(at: path, requiredBy: source)
-            return nil
-        }
-        return getContentOfFile(at: url, path: path, source: source)
-    }
-
-    /**
-     Get the content of a file which may not exist.
-     */
-    func getContentOfOptionalFile(at path: String, source: String, createEmptyFileIfMissing: Bool = false) -> String? {
-        let url = contentFolder.appendingPathComponent(path)
-        guard url.exists else {
-            if createEmptyFileIfMissing {
-                writeIfChanged(.init(), file: path, source: source)
-            }
-            return nil
-        }
-        return getContentOfFile(at: url, path: path, source: source)
-    }
-
-    func getContentOfMdFile(at path: String, source: String) -> String? {
-        guard let result = getContentOfOptionalFile(at: path, source: source, createEmptyFileIfMissing: configuration.createMdFilesIfMissing) else {
-            markPageAsEmpty(page: path, source: source)
-            return nil
-        }
-        return result
-    }
-
-    private func getContentOfFile(at url: URL, path: String, source: String) -> String? {
-        do {
-            return try String(contentsOf: url)
-        } catch {
-            markFileAsUnreadable(at: path, requiredBy: source, message: "\(error)")
-            return nil
-        }
-    }
-
-    @discardableResult
-    func writeIfChanged(_ data: Data, file: String, source: String) -> Bool {
-        let url = outputFolder.appendingPathComponent(file)
-
-        defer {
-            didCompletePage()
-        }
-        // Only write changed files
-        if url.exists, let oldContent = try? Data(contentsOf: url), data == oldContent {
-            return false
-        }
-        do {
-            try data.createFolderAndWrite(to: url)
-            markFileAsGenerated(file: file)
-            return true
-        } catch {
-            markFileAsUnwritable(at: file, requiredBy: source, message: "Failed to write file: \(error)")
-            return false
-        }
-    }
-
-    // MARK: Images
-
-    /**
-     Request the creation of an image.
-     - Returns: The final size of the image.
-     */
-    @discardableResult
-    func requireSingleImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int? = nil) -> NSSize {
-        requireImage(
-            at: destination,
-            generatedFrom: source,
-            requiredBy: path,
-            quality: 0.7,
-            width: width,
-            height: desiredHeight,
-            alwaysGenerate: false)
-    }
-
-    /**
-     Create images of different types.
-
-     This function generates versions for the given image, including png/jpg, avif, and webp. Different pixel density versions (1x and 2x) are also generated.
-     - Parameter destination: The path to the destination file
-     */
-    @discardableResult
-    func requireMultiVersionImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int?) -> NSSize {
-        // Add @2x version
-        _ = requireScaledMultiImage(
-            source: source,
-            destination: destination.insert("@2x", beforeLast: "."),
-            requiredBy: path,
-            width: width * 2,
-            desiredHeight: desiredHeight.unwrapped { $0 * 2 })
-
-        // Add @1x version
-        return requireScaledMultiImage(source: source, destination: destination, requiredBy: path, width: width, desiredHeight: desiredHeight)
-    }
-
-    func requireFullSizeMultiVersionImage(source: String, destination: String, requiredBy path: String) -> NSSize {
-        requireMultiVersionImage(source: source, destination: destination, requiredBy: path, width: configuration.pageImageWidth, desiredHeight: nil)
-    }
-
-    @discardableResult
-    private func requireScaledMultiImage(source: String, destination: String, requiredBy path: String, width: Int, desiredHeight: Int?) -> NSSize {
-        let rawDestinationPath = destination.dropAfterLast(".")
-        let avifPath = rawDestinationPath + ".avif"
-        let webpPath = rawDestinationPath + ".webp"
-        let needsGeneration = !outputFolder.appendingPathComponent(avifPath).exists || !outputFolder.appendingPathComponent(webpPath).exists
-
-        let size = requireImage(at: destination, generatedFrom: source, requiredBy: path, quality: 1.0, width: width, height: desiredHeight, alwaysGenerate: needsGeneration)
-        images.multiJobs[destination] = path
-        return size
-    }
-
-    private func markImageAsMissing(path: String, source: String) {
-        images.missing[source] = path
-    }
-
-    private func requireImage(at destination: String, generatedFrom source: String, requiredBy path: String, quality: Float, width: Int, height: Int?, alwaysGenerate: Bool) -> NSSize {
-        let height = height.unwrapped(CGFloat.init)
-        guard let imageSize = getImageSize(atPath: source, source: path) else {
-            // Image marked as missing here
-            return .zero
-        }
-        let scaledSize = imageSize.scaledDown(to: CGFloat(width))
-
-        // Check desired height, then we can forget about it
-        if let height = height {
-            let expectedHeight = scaledSize.width / CGFloat(width) * height
-            if abs(expectedHeight - scaledSize.height) > 2 {
-                warning("Expected a height of \(expectedHeight) (is \(scaledSize.height))", destination: destination, path: path)
-            }
-        }
-
-        let job = ImageJob(
-            destination: destination,
-            width: width,
-            path: path,
-            quality: quality,
-            alwaysGenerate: alwaysGenerate)
-        insert(job: job, source: source)
-
-        return scaledSize
-    }
-
-    private func getImageSize(atPath path: String, source: String) -> NSSize? {
-        if let size = imageSizeCache[path] {
-            return size
-        }
-        let url = contentFolder.appendingPathComponent(path)
-        guard url.exists else {
-            markImageAsMissing(path: path, source: source)
-            return nil
-        }
-        guard let data = getImageData(at: url, path: path, source: source) else {
-            return nil
-        }
-
-        guard let image = NSImage(data: data) else {
-            images.unreadable[path] = source
-            return nil
-        }
-
-        let size = image.size
-        imageSizeCache[path] = size
-        return size
-    }
-
-    private func getImageData(at url: URL, path: String, source: String) -> Data? {
-        do {
-            let data = try Data(contentsOf: url)
-            fileUpdates.didLoad(data, at: path)
-            return data
-        } catch {
-            markFileAsUnreadable(at: path, requiredBy: source, message: "\(error)")
-            return nil
-        }
-    }
-
-    private func insert(job: ImageJob, source: String) {
-        guard let existingSource = images.jobs[source] else {
-            images.jobs[source] = [job]
-            return
-        }
-
-        guard let existingJob = existingSource.first(where: { $0.destination == job.destination }) else {
-            images.jobs[source] = existingSource + [job]
-            return
-        }
-
-        guard existingJob.width != job.width else {
-            return
-        }
-        warning("Different width \(existingJob.width) as \(job.path) (width \(job.width))",
-                destination: job.destination, path: existingJob.path)
-    }
-
-    // MARK: Visual output
-
-    func didCompletePage() {
-        numberOfProcessedPages += 1
-        print("       Processed pages: \(numberOfProcessedPages)/\(numberOfTotalPages)    \r", terminator: "")
-        fflush(stdout)
-    }
-
-    func printOverview() {
-        var notes: [String] = []
-        func addIfNotZero(_ count: Int, _ name: String) {
-            guard count > 0 else {
-                return
-            }
-            notes.append("\(count) \(name)")
-        }
-        func addIfNotZero<S>(_ sequence: Array<S>, _ name: String) {
-            addIfNotZero(sequence.count, name)
-        }
-        addIfNotZero(missingFiles.count, "missing files")
-        addIfNotZero(unreadableFiles.count, "unreadable files")
-        addIfNotZero(unwritableFiles.count, "unwritable files")
-        addIfNotZero(missingLinkedPages.count, "missing linked pages")
-        addIfNotZero(pageWarnings.count, "warnings")
-
-        print("         Updated pages: \(generatedFiles.count)/\(numberOfProcessedPages)     ")
-        print("                Drafts: \(draftPages.count)")
-        print("           Empty pages: \(emptyPages.count)")
-        if !notes.isEmpty {
-            print("                 Notes: " + notes.joined(separator: ", "))
-        }
-        print("")
-    }
-
-    func writeResults(to file: URL) {
-        var lines: [String] = []
-        func add<S>(_ name: String, _ property: S, convert: (S.Element) -> String) where S: Sequence {
-            let elements = property.map { "  " + convert($0) }.sorted()
-            guard !elements.isEmpty else {
-                return
-            }
-            lines.append("\(name):")
-            lines.append(contentsOf: elements)
-        }
-        add("Missing files", missingFiles) { "\($0.key) (required by \($0.value))" }
-        add("Unreadable files", unreadableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Unwritable files", unwritableFiles) { "\($0.key) (required by \($0.value.source)): \($0.value.message)" }
-        add("Missing linked pages", missingLinkedPages) { "\($0.key) (linked by \($0.value))" }
-        add("Warnings", pageWarnings) { "\($0.source): \($0.message)" }
-        add("Drafts", draftPages) { $0 }
-        add("Empty pages", emptyPages) { "\($0.key) (from \($0.value))" }
-        add("Generated files", generatedFiles) { $0 }
-        let data = lines.joined(separator: "\n").data(using: .utf8)!
-        do {
-            try data.createFolderAndWrite(to: file)
-        } catch {
-            print("    Failed to save log: \(error)")
-        }
-    }
-}
-

Sources/Generator/Processing/ImageData.swift

@@ -1,19 +0,0 @@
-import Foundation
-
-struct ImageData {
-
-    /// The images to generate (`key`: the image source path relative to the input folder)
-    var jobs: [String : [ImageJob]] = [:]
-
-    /// The images for which to generate multiple versions (`key`: the source file, `value`: the path of the requiring page)
-    var multiJobs: [String : String] = [:]
-
-    /// All warnings produced for images during generation
-    var warnings: [String] = []
-
-    /// The images which could not be found, but are required for the site (`key`: image path, `value`: source element path)
-    var missing: [String : String] = [:]
-
-    /// Images which could not be read (`key`: file path relative to content, `value`: source element path)
-    var unreadable: [String : String] = [:]
-}

Sources/Generator/Processing/ImageGenerator.swift

@@ -1,318 +0,0 @@
-import Foundation
-import AppKit
-import CryptoKit
-import Darwin.C
-
-final class ImageGenerator {
-
-    private let imageOptimSupportedFileExtensions: Set<String> = ["jpg", "png", "svg"]
-
-    private let imageOptimizationBatchSize = 50
-
-    /**
-     The path to the input folder.
-     */
-    private let input: URL
-
-    /**
-     The path to the output folder
-     */
-    private let output: URL
-
-    private let imageReader: ImageReader
-    
-    /**
-     All warnings produced for images during generation
-     */
-    private var imageWarnings: [String]
-
-    /// The images which could not be found, but are required for the site (`key`: image path, `value`: source element path)
-    private var missingImages: [String : String]
-
-    /// Images which could not be read (`key`: file path relative to content, `value`: source element path)
-    private var unreadableImages: [String : String]
-
-    private var unhandledImages: [String: String] = [:]
-
-    /// All images modified or created during this generator run.
-    private var generatedImages: Set<String> = []
-
-    /// The images optimized by ImageOptim
-    private var optimizedImages: Set<String> = []
-
-    private var failedImages: [(path: String, message: String)] = []
-
-    private var numberOfGeneratedImages = 0
-
-    private let numberOfTotalImages: Int
-
-    private lazy var numberImagesToCreate = jobs.reduce(0) { $0 + $1.images.count } + multiJobs.count * 2
-
-    private var numberOfImagesToOptimize = 0
-
-    private var numberOfOptimizedImages = 0
-
-    private let images: ImageData
-
-    private lazy var jobs: [(source: String, images: [ImageJob])] = images.jobs
-        .sorted { $0.key < $1.key }
-        .map { (source: $0.key, images: $0.value) }
-        .filter {
-            // Only load image if required
-            let imageHasChanged = imageReader.imageHasChanged(at: $0.source)
-            return imageHasChanged || $0.images.contains { job in
-                job.alwaysGenerate || !output.appendingPathComponent(job.destination).exists
-            }
-        }
-
-    private lazy var multiJobs: [String : String] = {
-        let imagesToGenerate: Set<String> = jobs.reduce([]) { $0.union($1.images.map { $0.destination }) }
-        return images.multiJobs.filter { imagesToGenerate.contains($0.key) }
-    }()
-
-    init(input: URL, output: URL, reader: ImageReader, images: ImageData) {
-        self.input = input
-        self.output = output
-        self.imageReader = reader
-        self.images = images
-        self.numberOfTotalImages = images.jobs.reduce(0) { $0 + $1.value.count }
-            + images.multiJobs.count * 2
-        self.imageWarnings = images.warnings
-        self.missingImages = images.missing
-        self.unreadableImages = images.unreadable
-    }
-
-    func generateImages() {
-        var notes: [String] = []
-        func addIfNotZero(_ count: Int, _ name: String) {
-            guard count > 0 else {
-                return
-            }
-            notes.append("\(count) \(name)")
-        }
-
-        print("       Changed sources: \(jobs.count)/\(images.jobs.count)")
-        print("          Total images: \(numberOfTotalImages) (\(numberOfTotalImages - imageReader.numberOfFilesAccessed) versions)")
-
-        for (source, jobs) in jobs {
-            create(images: jobs, from: source)
-        }
-        for (baseImage, source) in multiJobs {
-            createMultiImages(from: baseImage, path: source)
-        }
-        print("      Generated images: \(numberOfGeneratedImages)/\(numberImagesToCreate)")
-        optimizeImages()
-        print("      Optimized images: \(numberOfOptimizedImages)/\(numberOfImagesToOptimize)")
-
-        addIfNotZero(missingImages.count, "missing images")
-        addIfNotZero(unreadableImages.count, "unreadable images")
-        print("              Warnings: \(imageWarnings.count)")
-        if !notes.isEmpty {
-            print("                 Notes: " + notes.joined(separator: ", "))
-        }
-    }
-
-    private func create(images: [ImageJob], from source: String) {
-        guard let image = imageReader.getImage(atPath: source) else {
-            unreadableImages[source] = images.first!.destination
-            didGenerateImage(count: images.count)
-            return
-        }
-        let jobs = imageReader.imageHasChanged(at: source) ? images : images.filter(isMissing)
-        // Update all images
-        jobs.forEach { job in
-            // Prevent memory overflow due to repeated NSImage operations
-            autoreleasepool {
-                create(job: job, from: image, source: source)
-                didGenerateImage()
-            }
-        }
-    }
-
-    private func isMissing(_ job: ImageJob) -> Bool {
-        job.alwaysGenerate || !output.appendingPathComponent(job.destination).exists
-    }
-
-
-    private func create(job: ImageJob, from image: NSImage, source: String) {
-        let destinationUrl = output.appendingPathComponent(job.destination)
-        create(job: job, from: image, source: source, at: destinationUrl)
-    }
-
-    private func create(job: ImageJob, from image: NSImage, source: String, at destinationUrl: URL) {
-        // Ensure that image file is supported
-        let ext = destinationUrl.pathExtension.lowercased()
-        guard ImageType(fileExtension: ext) != nil else {
-            fatalError()
-        }
-
-        let destinationExtension = destinationUrl.pathExtension.lowercased()
-        guard let type = ImageType(fileExtension: destinationExtension)?.fileType else {
-            unhandledImages[source] = job.destination
-            return
-        }
-
-        let desiredWidth = CGFloat(job.width)
-
-        let sourceRep = image.representations[0]
-        let destinationSize = NSSize(width: sourceRep.pixelsWide, height: sourceRep.pixelsHigh)
-            .scaledDown(to: desiredWidth)
-
-        // create NSBitmapRep manually, if using cgImage, the resulting size is wrong
-        let rep = NSBitmapImageRep(bitmapDataPlanes: nil,
-                                   pixelsWide: Int(destinationSize.width),
-                                   pixelsHigh: Int(destinationSize.height),
-                                   bitsPerSample: 8,
-                                   samplesPerPixel: 4,
-                                   hasAlpha: true,
-                                   isPlanar: false,
-                                   colorSpaceName: NSColorSpaceName.deviceRGB,
-                                   bytesPerRow: Int(destinationSize.width) * 4,
-                                   bitsPerPixel: 32)!
-
-        let ctx = NSGraphicsContext(bitmapImageRep: rep)
-        NSGraphicsContext.saveGraphicsState()
-        NSGraphicsContext.current = ctx
-        image.draw(in: NSMakeRect(0, 0, destinationSize.width, destinationSize.height))
-        ctx?.flushGraphics()
-        NSGraphicsContext.restoreGraphicsState()
-
-        // Get NSData, and save it
-        guard let data = rep.representation(using: type, properties: [.compressionFactor: NSNumber(value: job.quality)]) else {
-            markImageAsFailed(source, error: "Failed to get data")
-            return
-        }
-        do {
-            try data.createFolderAndWrite(to: destinationUrl)
-        } catch {
-            markImageAsFailed(job.destination, error: "Failed to write image (\(error))")
-            return
-        }
-        generatedImages.insert(job.destination)
-    }
-
-    private func markImageAsFailed(_ source: String, error: String) {
-        failedImages.append((source, error))
-    }
-
-    private func createMultiImages(from source: String, path: String) {
-        guard generatedImages.contains(source) else {
-            didGenerateImage(count: 2)
-            return
-        }
-
-        let sourceUrl = output.appendingPathComponent(source)
-        let sourcePath = sourceUrl.path
-        guard sourceUrl.exists else {
-            missingImages[source] = path
-            didGenerateImage(count: 2)
-            return
-        }
-
-        let avifPath = source.dropAfterLast(".") + ".avif"
-        createAVIF(at: output.appendingPathComponent(avifPath).path, from: sourcePath)
-        generatedImages.insert(avifPath)
-        didGenerateImage()
-
-        let webpPath = source.dropAfterLast(".") + ".webp"
-        createWEBP(at: output.appendingPathComponent(webpPath).path, from: sourcePath)
-        generatedImages.insert(webpPath)
-        didGenerateImage()
-
-        compress(at: source)
-    }
-
-    private func createAVIF(at destination: String, from source: String, quality: Int = 55, effort: Int = 5) {
-        let folder = destination.dropAfterLast("/")
-        let command = "npx avif --input=\(source) --quality=\(quality) --effort=\(effort) --output=\(folder) --overwrite"
-        do {
-            _ = try safeShell(command)
-        } catch {
-            markImageAsFailed(destination, error: "Failed to create AVIF image")
-        }
-    }
-
-    private func createWEBP(at destination: String, from source: String, quality: Int = 75) {
-        let command = "cwebp \(source) -q \(quality) -o \(destination)"
-        do {
-            _ = try safeShell(command)
-        } catch {
-            markImageAsFailed(destination, error: "Failed to create WEBP image")
-        }
-    }
-
-    private func compress(at destination: String, quality: Int = 70) {
-        let command = "magick convert \(destination) -quality \(quality)% \(destination)"
-        do {
-            _ = try safeShell(command)
-        } catch {
-            markImageAsFailed(destination, error: "Failed to compress image")
-        }
-    }
-
-    private func optimizeImages() {
-        let all = generatedImages
-            .filter { imageOptimSupportedFileExtensions.contains($0.lastComponentAfter(".")) }
-            .map { output.appendingPathComponent($0).path }
-        for i in stride(from: 0, to: all.count, by: imageOptimizationBatchSize) {
-            let endIndex = min(i+imageOptimizationBatchSize, all.count)
-            let batch = all[i..<endIndex]
-            if optimizeImageBatch(batch) {
-                optimizedImages.formUnion(batch)
-            }
-            didOptimizeImage(count: batch.count)
-        }
-    }
-
-    private func optimizeImageBatch(_ batch: ArraySlice<String>) -> Bool {
-        let command = "imageoptim " + batch.joined(separator: " ")
-        do {
-            _ = try safeShell(command)
-            return true
-        } catch {
-            for image in batch {
-                markImageAsFailed(image, error: "Failed to optimize image")
-            }
-            return false
-        }
-    }
-
-    // MARK: Output
-
-    private func didGenerateImage(count: Int = 1) {
-        numberOfGeneratedImages += count
-        print("      Generated images: \(numberOfGeneratedImages)/\(numberImagesToCreate)    \r", terminator: "")
-        fflush(stdout)
-    }
-
-    private func didOptimizeImage(count: Int) {
-        numberOfOptimizedImages += count
-        print("      Optimized images: \(numberOfOptimizedImages)/\(numberOfImagesToOptimize)    \r", terminator: "")
-        fflush(stdout)
-    }
-
-    func writeResults(to file: URL) {
-        var lines: [String] = []
-        func add<S>(_ name: String, _ property: S, convert: (S.Element) -> String) where S: Sequence {
-            let elements = property.map { "  " + convert($0) }.sorted()
-            guard !elements.isEmpty else {
-                return
-            }
-            lines.append("\(name):")
-            lines.append(contentsOf: elements)
-        }
-        add("Missing images", missingImages) { "\($0.key) (required by \($0.value))" }
-        add("Unreadable images", unreadableImages) { "\($0.key) (required by \($0.value))" }
-        add("Failed images", failedImages) { "\($0.path): \($0.message)" }
-        add("Unhandled images", unhandledImages) { "\($0.value) (from \($0.key))" }
-        add("Warnings", imageWarnings) { $0 }
-        add("Generated images", generatedImages) { $0 }
-        add("Optimized images", optimizedImages) { $0 }
-        let data = lines.joined(separator: "\n").data(using: .utf8)!
-        do {
-            try data.createFolderAndWrite(to: file)
-        } catch {
-            print("    Failed to save log: \(error)")
-        }
-    }
-}

Sources/Generator/Processing/MetadataInfoLogger.swift

@@ -124,10 +124,10 @@ final class MetadataInfoLogger {
     // MARK: Printing
 
     private func printMetadataScanUpdate() {
-        print("           Pages found: \(numberOfMetadataFiles)   \r", terminator: "")
+        print(String(format: "Scanning source files: %4d pages found     \r", numberOfMetadataFiles), terminator: "")
     }
 
-    func printMetadataScanOverview(languages: Int) {
+    func printMetadataScanOverview() {
         var notes = [String]()
         func addIfNotZero<S>(_ sequence: Array<S>, _ name: String) {
             guard sequence.count > 0 else {
@@ -139,40 +139,40 @@ final class MetadataInfoLogger {
         addIfNotZero(errors, "errors")
         addIfNotZero(unreadableMetadata, "unreadable files")
         addIfNotZero(unusedProperties, "unused properties")
-        addIfNotZero(invalidProperties, "invalid properties")
+        addIfNotZero(invalidProperties, "invalidProperties")
-        addIfNotZero(unknownProperties, "unknown properties")
+        addIfNotZero(unknownProperties, "unknownProperties")
-        addIfNotZero(missingProperties, "missing properties")
+        addIfNotZero(missingProperties, "missingProperties")
 
-        print("           Pages found: \(numberOfMetadataFiles)        ")
+        print(" Number of pages: \(numberOfMetadataFiles)")
-        print("             Languages: \(languages)")
+        print("           Notes: " + notes.joined(separator: ", "))
-        if !notes.isEmpty {
-            print("                 Notes: " + notes.joined(separator: ", "))
-        }
     }
 
-    func writeResults(to file: URL) {
+    func writeResultsToFile(in folder: URL) throws {
+        let url = folder.appendingPathComponent("Metadata issues.txt")
         var lines: [String] = []
-        func add<S>(_ name: String, _ property: S, convert: (S.Element) -> String) where S: Sequence {
+        if !errors.isEmpty {
-            let elements = property.map { "  " + convert($0) }.sorted()
+            lines += ["Errors:"] + errors.map { "\($0.source): \($0.message)" }
-            guard !elements.isEmpty else {
+        }
-                return
+        if !warnings.isEmpty {
-            }
+            lines += ["Warnings:"] + warnings.map { "\($0.source): \($0.message)" }
-            lines.append("\(name):")
+        }
-            lines.append(contentsOf: elements)
+        if !unreadableMetadata.isEmpty {
+            lines += ["Unreadable files:"] + unreadableMetadata.map { "\($0.source): \($0.error)" }
+        }
+        if !unusedProperties.isEmpty {
+            lines += ["Unused properties:"] + unusedProperties.map { "\($0.source): \($0.name)" }
+        }
+        if !invalidProperties.isEmpty {
+            lines += ["Invalid properties:"] + invalidProperties.map { "\($0.source): \($0.name) (\($0.reason))" }
+        }
+        if !unknownProperties.isEmpty {
+            lines += ["Unknown properties:"] + unknownProperties.map { "\($0.source): \($0.name)" }
+        }
+        if !missingProperties.isEmpty {
+            lines += ["Missing properties:"] + missingProperties.map { "\($0.source): \($0.name)" }
         }
-        add("Errors", errors) { "\($0.source): \($0.message)" }
-        add("Warnings", warnings) { "\($0.source): \($0.message)" }
-        add("Unreadable files", unreadableMetadata) { "\($0.source): \($0.error)" }
-        add("Unused properties", unusedProperties) { "\($0.source): \($0.name)" }
-        add("Invalid properties", invalidProperties) { "\($0.source): \($0.name) (\($0.reason))" }
-        add("Unknown properties", unknownProperties) { "\($0.source): \($0.name)" }
-        add("Missing properties", missingProperties) { "\($0.source): \($0.name)" }
 
-        let data = lines.joined(separator: "\n").data(using: .utf8)!
+        let data = lines.joined(separator: "\n").data(using: .utf8)
-        do {
+        try data?.createFolderAndWrite(to: url)
-            try data.createFolderAndWrite(to: file)
-        } catch {
-            print("    Failed to save log: \(error)")
-        }
     }
 }

Sources/Generator/Processing/Shell.swift

@@ -1,20 +0,0 @@
-import Foundation
-
-@discardableResult
-func safeShell(_ command: String) throws -> String {
-    let task = Process()
-    let pipe = Pipe()
-
-    task.standardOutput = pipe
-    task.standardError = pipe
-    task.arguments = ["-cl", command]
-    task.executableURL = URL(fileURLWithPath: "/bin/zsh")
-    task.standardInput = nil
-
-    try task.run()
-
-    let data = pipe.fileHandleForReading.readDataToEndOfFile()
-    let output = String(data: data, encoding: .utf8)!
-
-    return output
-}

Sources/Generator/Templates/Elements/BackNavigationTemplate.swift

@@ -10,6 +10,4 @@ struct BackNavigationTemplate: Template {
     static let templateName = "back.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Elements/BoxTemplate.swift

@@ -10,6 +10,4 @@ struct BoxTemplate: Template {
     static let templateName = "box.html"
 
     var raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Elements/OverviewSectionCleanTemplate.swift

@@ -9,6 +9,4 @@ struct OverviewSectionCleanTemplate: Template {
     static let templateName = "overview-section-clean.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Elements/OverviewSectionTemplate.swift

@@ -12,6 +12,4 @@ struct OverviewSectionTemplate: Template {
     static let templateName = "overview-section.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Elements/PageHeadTemplate.swift

@@ -12,7 +12,5 @@ struct PageHeadTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     static let templateName = "head.html"
 }

Sources/Generator/Templates/Elements/PageImageTemplate.swift

@@ -15,6 +15,4 @@ struct PageImageTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
 }

Sources/Generator/Templates/Elements/PageLinkTemplate.swift

@@ -15,8 +15,6 @@ struct PageLinkTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     func makePath(components: [String]) -> String {
         components.joined(separator: " » ") //  » ")
     }

Sources/Generator/Templates/Elements/PageVideoTemplate.swift

@@ -23,8 +23,6 @@ struct PageVideoTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     func generate<T>(sources: [VideoSource], options: T) -> String where T: Sequence, T.Element == VideoOption {
         let sourcesCode = sources.map(makeSource).joined(separator: "\n")
         let optionCode = options.map { $0.rawValue }.joined(separator: " ")

Sources/Generator/Templates/Elements/ThumbnailTemplate.swift

@@ -20,8 +20,6 @@ struct LargeThumbnailTemplate: Template, ThumbnailTemplate {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     func makeCorner(text: String) -> String {
         "<span class=\"corner\"><span>\(text)</span></span>"
     }
@@ -38,8 +36,6 @@ struct SquareThumbnailTemplate: Template, ThumbnailTemplate {
     static let templateName = "thumbnail-square.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }
 
 struct SmallThumbnailTemplate: Template, ThumbnailTemplate {
@@ -49,7 +45,5 @@ struct SmallThumbnailTemplate: Template, ThumbnailTemplate {
     static let templateName = "thumbnail-small.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }
 

Sources/Generator/Templates/Elements/TopBarTemplate.swift

@@ -12,6 +12,4 @@ struct TopBarTemplate: Template {
     static let templateName = "bar.html"
 
     var raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Filled/LocalizedSiteTemplate.swift

@@ -35,7 +35,7 @@ struct LocalizedSiteTemplate {
         factory.page
     }
 
-    init(factory: TemplateFactory, language: String, site: Element, results: GenerationResultsHandler) {
+    init(factory: TemplateFactory, language: String, site: Element) {
         self.author = site.author
         self.factory = factory
 
@@ -66,8 +66,10 @@ struct LocalizedSiteTemplate {
             language: language,
             sections: sections,
             topBarWebsiteTitle: site.topBarTitle)
-        self.pageHead = PageHeadGenerator(factory: factory, results: results)
+        self.pageHead = PageHeadGenerator(
-        self.overviewSection = OverviewSectionGenerator(factory: factory, results: results)
+            factory: factory)
+        self.overviewSection = OverviewSectionGenerator(
+            factory: factory)
     }
 
     // MARK: Content

Sources/Generator/Templates/Pages/HeaderTemplate.swift

@@ -19,8 +19,6 @@ struct CenteredHeaderTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     static let templateName = "header-center.html"
 }
 
@@ -30,7 +28,5 @@ struct LeftHeaderTemplate: Template {
 
     let raw: String
 
-    let results: GenerationResultsHandler
-
     static let templateName = "header-left.html"
 }

Sources/Generator/Templates/Pages/PageTemplate.swift

@@ -18,6 +18,4 @@ struct PageTemplate: Template {
     static let templateName = "page.html"
 
     let raw: String
-
-    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Template.swift

@@ -8,33 +8,25 @@ protocol Template {
     
     var raw: String { get }
 
-    var results: GenerationResultsHandler { get }
+    init(raw: String)
-
-    init(raw: String, results: GenerationResultsHandler)
 
 }
 
 extension Template {
 
-    init(in folder: URL, results: GenerationResultsHandler) throws {
+    init(in folder: URL) throws {
         let url = folder.appendingPathComponent(Self.templateName)
-        try self.init(from: url, results: results)
+        try self.init(from: url)
     }
 
-    init(from url: URL, results: GenerationResultsHandler) throws {
+    init(from url: URL) throws {
-        do {
+        let raw = try String(contentsOf: url)
-            let raw = try String(contentsOf: url)
+        self.init(raw: raw)
-            self.init(raw: raw, results: results)
-        } catch {
-            results.warning("Failed to load: \(error)", source: "Template \(url.lastPathComponent)")
-           throw error
-        }
     }
 
-    @discardableResult
+    func generate(_ content: [Key : String], to url: URL) -> Bool {
-    func generate(_ content: [Key : String], to file: String, source: String) -> Bool {
+        let content = generate(content)
-        let content = generate(content).data(using: .utf8)!
+        return files.write(content, to: url)
-        return results.writeIfChanged(content, file: file, source: source)
     }
 
     func generate(_ content: [Key : String], shouldIndent: Bool = false) -> String {

Sources/Generator/Templates/TemplateFactory.swift

@@ -59,23 +59,23 @@ final class TemplateFactory {
 
     // MARK: Init
 
-    init(templateFolder: URL, results: GenerationResultsHandler) throws {
+    init(templateFolder: URL) throws {
         self.templateFolder = templateFolder
-        self.backNavigation = try .init(in: templateFolder, results: results)
+        self.backNavigation = try .init(in: templateFolder)
-        self.pageHead = try .init(in: templateFolder, results: results)
+        self.pageHead = try .init(in: templateFolder)
-        self.topBar = try .init(in: templateFolder, results: results)
+        self.topBar = try .init(in: templateFolder)
-        self.overviewSection = try .init(in: templateFolder, results: results)
+        self.overviewSection = try .init(in: templateFolder)
-        self.overviewSectionClean = try .init(in: templateFolder, results: results)
+        self.overviewSectionClean = try .init(in: templateFolder)
-        self.box = try .init(in: templateFolder, results: results)
+        self.box = try .init(in: templateFolder)
-        self.pageLink = try .init(in: templateFolder, results: results)
+        self.pageLink = try .init(in: templateFolder)
-        self.largeThumbnail = try .init(in: templateFolder, results: results)
+        self.largeThumbnail = try .init(in: templateFolder)
-        self.squareThumbnail = try .init(in: templateFolder, results: results)
+        self.squareThumbnail = try .init(in: templateFolder)
-        self.smallThumbnail = try .init(in: templateFolder, results: results)
+        self.smallThumbnail = try .init(in: templateFolder)
-        self.leftHeader = try .init(in: templateFolder, results: results)
+        self.leftHeader = try .init(in: templateFolder)
-        self.centeredHeader = try .init(in: templateFolder, results: results)
+        self.centeredHeader = try .init(in: templateFolder)
-        self.page = try .init(in: templateFolder, results: results)
+        self.page = try .init(in: templateFolder)
-        self.image = try .init(in: templateFolder, results: results)
+        self.image = try .init(in: templateFolder)
-        self.video = try .init(in: templateFolder, results: results)
+        self.video = try .init(in: templateFolder)
         self.html = .init()
     }
 

Sources/Generator/run.swift

@@ -1,6 +1,8 @@
 import Foundation
 import ArgumentParser
 
+let log = ValidationLog()
+var files: FileSystem!
 
 @main
 struct CHGenerator: ParsableCommand {
@@ -13,10 +15,20 @@ struct CHGenerator: ParsableCommand {
     }
 }
 
+private func loadSiteData(in folder: URL) throws -> Element? {
+    let log = MetadataInfoLogger(input: folder)
+    print("--- SOURCE FILES -----------------------------------")
+    let root = Element(atRoot: folder, log: log)
+    print("                                                    ")
+    log.printMetadataScanOverview()
+    print("                                                    ")
+    try log.writeResultsToFile(in: files.generatorInfoFolder)
+    return root
+}
+
 private func loadConfiguration(at configPath: String) -> Configuration? {
-    print("                                                    ")
     print("--- CONFIGURATION ----------------------------------")
-    print("                                                    ")
+    print("")
     print("    Configuration file: \(configPath)")
     let configUrl = URL(fileURLWithPath: configPath)
     let config: Configuration
@@ -24,7 +36,7 @@ private func loadConfiguration(at configPath: String) -> Configuration? {
         let data = try Data(contentsOf: configUrl)
         config = try JSONDecoder().decode(from: data)
     } catch {
-        print("   Configuration error: \(error)")
+        print("    Configuration error: \(error)")
         return nil
     }
     config.printOverview()
@@ -32,136 +44,30 @@ private func loadConfiguration(at configPath: String) -> Configuration? {
     return config
 }
 
-private func loadSiteData(in folder: URL, runFolder: URL) throws -> (root: Element, ids: [String : String])? {
-    print("--- SOURCE FILES -----------------------------------")
-    print("                                                    ")
-
-    let log = MetadataInfoLogger(input: folder)
-    let root = Element(atRoot: folder, log: log)
-
-    let file = runFolder.appendingPathComponent("metadata.txt")
-    defer {
-        log.writeResults(to: file)
-        print("                                                    ")
-    }
-    guard let root else {
-        log.printMetadataScanOverview(languages: 0)
-        print("                Error: No site root loaded, aborting generation")
-        return nil
-    }
-    let ids = root.getContainedIds(log: log)
-    log.printMetadataScanOverview(languages: root.languages.count)
-    return (root, ids)
-}
-
-private func generatePages(from root: Element, configuration: Configuration, fileUpdates: FileUpdateChecker, ids: [String: String], runFolder: URL) -> (ImageData, FileData)? {
-    print("--- GENERATION -------------------------------------")
-    print("                                                    ")
-
-    let pageCount = ids.count * root.languages.count
-    let results = GenerationResultsHandler(
-        in: configuration.contentDirectory,
-        to: configuration.outputDirectory,
-        configuration: configuration,
-        fileUpdates: fileUpdates,
-        pagePaths: ids,
-        pageCount: pageCount)
-
-    defer { results.printOverview() }
-
-    let siteGenerator: SiteGenerator
-    do {
-        siteGenerator = try SiteGenerator(results: results)
-    } catch {
-        return nil
-    }
-    siteGenerator.generate(site: root)
-
-    let url = runFolder.appendingPathComponent("pages.txt")
-    results.writeResults(to: url)
-
-    if let error = fileUpdates.writeDetectedFileChanges(to: runFolder) {
-        print("      Hashes not saved: \(error)")
-    }
-    return (results.images, results.files)
-}
-
-private func generateImages(_ images: ImageData, configuration: Configuration, runFolder: URL, fileUpdates: FileUpdateChecker) {
-    print("--- IMAGES -----------------------------------------")
-    print("                                                    ")
-    let reader = ImageReader(in: configuration.contentDirectory, runFolder: runFolder, fileUpdates: fileUpdates)
-    let generator = ImageGenerator(
-        input: configuration.contentDirectory,
-        output: configuration.outputDirectory,
-        reader: reader, images: images)
-    generator.generateImages()
-    print("                                                    ")
-    let file = runFolder.appendingPathComponent("images.txt")
-    generator.writeResults(to: file)
-}
-
-private func copyFiles(files: FileData, configuration: Configuration, runFolder: URL) {
-    print("--- FILES ------------------------------------------")
-    print("                                                    ")
-    let generator = FileGenerator(
-        input: configuration.contentDirectory,
-        output: configuration.outputDirectory,
-        runFolder: runFolder,
-        files: files)
-    generator.generate()
-}
-
-private func finish(start: Date) {
-    print("----------------------------------------------------")
-    print("                                                    ")
-    let duration = Int(-start.timeIntervalSinceNow.rounded())
-    if duration < 60 {
-        print("              Duration: \(duration) s")
-    } else if duration < 3600 {
-        print(String(format: "              Duration: %d:%02d", duration / 60, duration % 60))
-    } else {
-        print(String(format: "              Duration: %d:%02d:%02d", duration / 3600, (duration / 60) % 60, duration % 60))
-    }
-    print("")
-}
-
 private func generate(configPath: String) throws {
-    let start = Date()
-
-    // 1. Load configuration
     guard let configuration = loadConfiguration(at: configPath) else {
         return
     }
 
-    let runFolder = configuration.contentDirectory.appendingPathComponent("run")
+    files = .init(
+        in: configuration.contentDirectory,
+        to: configuration.outputDirectory,
+        configuration: configuration)
+
 
     // 2. Scan site elements
-    guard let (siteRoot, ids) = try loadSiteData(in: configuration.contentDirectory, runFolder: runFolder) else {
+    guard let siteRoot = try loadSiteData(in: configuration.contentDirectory) else {
         return
     }
+    let siteGenerator = try SiteGenerator()
+    siteGenerator.generate(site: siteRoot)
 
-    let fileUpdates = FileUpdateChecker(input: configuration.contentDirectory)
+    files.printGeneratedPages()
-    switch fileUpdates.loadPreviousRun(from: runFolder)  {
+    files.printEmptyPages()
-    case .notLoaded:
+    files.printDraftPages()
-        print("Regarding all files as new (no hashes loaded)")
-    case .loaded:
-        break
-    case .failed(let error):
-        print("Regarding all files as new (\(error))")
-    }
 
-    // 3. Generate pages
+    files.createImages()
-
+    files.copyRequiredFiles()
-    guard let (images, files) = generatePages(from: siteRoot, configuration: configuration, fileUpdates: fileUpdates, ids: ids, runFolder: runFolder) else {
+    files.printExternalFiles()
-        return
+    files.writeDetectedFileChangesToDisk()
-    }
-
-    // 4. Generate images
-    generateImages(images, configuration: configuration, runFolder: runFolder, fileUpdates: fileUpdates)
-
-    // 5. Copy/minify files
-    copyFiles(files: files, configuration: configuration, runFolder: runFolder)
-
-    // 6. Print summary
-    finish(start: start)
 }