Fix external links in related content

Remove throws from Element constructor

.gitignore

@@ -0,0 +1,5 @@
+config.json
+.build
+.swiftpm
+Package.resolved
+Issues.md

Package.swift

@@ -0,0 +1,26 @@
+// swift-tools-version: 5.6
+import PackageDescription
+
+let package = Package(
+    name: "CHGenerator",
+    platforms: [.macOS(.v10_15)],
+    products: [
+        .executable(
+            name: "CHGenerator",
+            targets: ["Generator"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/johnsundell/ink.git", from: "0.5.0"),
+        .package(url: "https://github.com/JohnSundell/Splash", from: "0.16.0"),
+        .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
+    ],
+    targets: [
+        .executableTarget(
+            name: "Generator",
+            dependencies: [
+                .product(name: "Ink", package: "ink"),
+                .product(name: "Splash", package: "Splash"),
+                .product(name: "ArgumentParser", package: "swift-argument-parser"),
+            ]),
+    ]
+)

Sources/Generator/Content/DefaultValueProvider.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+protocol DefaultValueProvider {
+
+    static var defaultValue: Self { get }
+}

Sources/Generator/Content/Element+LocalizedMetadata.swift

@@ -57,7 +57,7 @@ extension Element {
          - Note: If this value is inherited from the parent, if it is not defined. There must be at least one
          element in the path that defines this property.
          */
-        let moreLinkText: String
+        let moreLinkText: String?
 
         /**
          The text on the back navigation link of **contained** elements.
@@ -119,76 +119,92 @@ extension Element {
          It can also be set to manually write a page.
          */
         let externalUrl: String?
+
+        /**
+         The text to display for content related to the current page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let relatedContentText: String
+
+        /**
+         The text to display on the navigation element pointing to this element as the next page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let navigationTextAsNextPage: String
+
+        /**
+         The text to display on a navigation element pointing to this element as the previous page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let navigationTextAsPreviousPage: String
+
+        /**
+         The text to display above a slideshow for most recent items.
+         Only used for elements that define `showMostRecentSection = true`
+         */
+        let mostRecentTitle: String?
+
+        /**
+         The text to display above a slideshow for featured items.
+         Only used for elements that define `showFeaturedSection = true`
+         */
+        let featuredTitle: String?
     }
 }
 
 extension Element.LocalizedMetadata {
 
-    init?(atRoot folder: URL, data: GenericMetadata.LocalizedMetadata) {
+    init?(atRoot folder: URL, data: GenericMetadata.LocalizedMetadata, log: MetadataInfoLogger) {
         // Go through all elements and check them for completeness
         // In the end, check that all required elements are present
-        var isComplete = true
-        func markAsIncomplete() {
-            isComplete = false
-        }
+        var isValid = true
+
         let source = "root"
-        self.language = log
-            .required(data.language, name: "language", source: source)
-            .ifNil(markAsIncomplete) ?? ""
-        self.title = log
-            .required(data.title, name: "title", source: source)
-            .ifNil(markAsIncomplete) ?? ""
+        self.language = log.required(data.language, name: "language", source: source, &isValid)
+        self.title = log.required(data.title, name: "title", source: source, &isValid)
         self.subtitle = data.subtitle
         self.description = data.description
         self.linkPreviewTitle = data.linkPreviewTitle ?? data.title ?? ""
-        self.linkPreviewImage = log
-            .linkPreviewThumbnail(customFile: data.linkPreviewImage, for: language, in: folder, source: source)
+        self.linkPreviewImage = data.linkPreviewImage
         let linkPreviewDescription = data.linkPreviewDescription ?? data.description ?? data.subtitle
-        self.linkPreviewDescription = log
-            .required(linkPreviewDescription, name: "linkPreviewDescription", source: source)
-            .ifNil(markAsIncomplete) ?? ""
-        self.moreLinkText = data.moreLinkText ?? Element.LocalizedMetadata.moreLinkDefaultText
-        self.backLinkText = log
-            .required(data.backLinkText, name: "backLinkText", source: source)
-            .ifNil(markAsIncomplete) ?? ""
+        self.linkPreviewDescription = log.required(linkPreviewDescription, name: "linkPreviewDescription", source: source, &isValid)
+        self.moreLinkText = data.moreLinkText
+        self.backLinkText = log.required(data.backLinkText, name: "backLinkText", source: source, &isValid)
         self.parentBackLinkText = "" // Root has no parent
-        self.placeholderTitle = log
-            .required(data.placeholderTitle, name: "placeholderTitle", source: source)
-            .ifNil(markAsIncomplete) ?? ""
-        self.placeholderText = log
-            .required(data.placeholderText, name: "placeholderText", source: source)
-            .ifNil(markAsIncomplete) ?? ""
+        self.placeholderTitle = log.required(data.placeholderTitle, name: "placeholderTitle", source: source, &isValid)
+        self.placeholderText = log.required(data.placeholderText, name: "placeholderText", source: source, &isValid)
         self.titleSuffix = data.titleSuffix
         self.thumbnailSuffix = log.unused(data.thumbnailSuffix, "thumbnailSuffix", source: source)
         self.cornerText = log.unused(data.cornerText, "cornerText", source: source)
-        self.externalUrl = log.unexpected(data.externalUrl, name: "externalUrl", source: source)
+        self.externalUrl = log.unused(data.externalUrl, "externalUrl", source: source)
+        self.relatedContentText = log.required(data.relatedContentText, name: "relatedContentText", source: source, &isValid)
+        self.navigationTextAsNextPage = log.required(data.navigationTextAsNextPage, name: "navigationTextAsNextPage", source: source, &isValid)
+        self.navigationTextAsPreviousPage = log.required(data.navigationTextAsPreviousPage, name: "navigationTextAsPreviousPage", source: source, &isValid)
+        self.mostRecentTitle = data.mostRecentTitle
+        self.featuredTitle = data.featuredTitle
 
-        guard isComplete else {
+        guard isValid else {
             return nil
         }
     }
 
-    init?(folder: URL, data: GenericMetadata.LocalizedMetadata, source: String, parent: Element.LocalizedMetadata) {
+    init?(folder: URL, data: GenericMetadata.LocalizedMetadata, source: String, parent: Element.LocalizedMetadata, log: MetadataInfoLogger) {
         // Go through all elements and check them for completeness
         // In the end, check that all required elements are present
-        var isComplete = true
-        func markAsIncomplete() {
-            isComplete = false
-        }
+        var isValid = true
+
         self.language = parent.language
-        self.title = log
-            .required(data.title, name: "title", source: source)
-            .ifNil(markAsIncomplete) ?? ""
+        self.title = log.required(data.title, name: "title", source: source, &isValid)
         self.subtitle = data.subtitle
         self.description = data.description
         self.linkPreviewTitle = data.linkPreviewTitle ?? data.title ?? ""
-        self.linkPreviewImage = log
-            .linkPreviewThumbnail(customFile: data.linkPreviewImage, for: language, in: folder, source: source)
+        self.linkPreviewImage = data.linkPreviewImage
         let linkPreviewDescription = data.linkPreviewDescription ?? data.description ?? data.subtitle
-        self.linkPreviewDescription = log
-            .required(linkPreviewDescription, name: "linkPreviewDescription", source: source)
-            .ifNil(markAsIncomplete) ?? ""
-        self.moreLinkText = log.moreLinkText(data.moreLinkText, parent: parent.moreLinkText, source: source)
+        self.linkPreviewDescription = log.required(linkPreviewDescription, name: "linkPreviewDescription", source: source, &isValid)
+        self.moreLinkText = log.required(data.moreLinkText ?? parent.moreLinkText, name: "moreLinkText", source: source, &isValid)
         self.backLinkText = data.backLinkText ?? data.title ?? ""
         self.parentBackLinkText = parent.backLinkText
         self.placeholderTitle = data.placeholderTitle ?? parent.placeholderTitle
@@ -197,33 +213,14 @@ extension Element.LocalizedMetadata {
         self.thumbnailSuffix = data.thumbnailSuffix
         self.cornerText = data.cornerText
         self.externalUrl = data.externalUrl
+        self.relatedContentText = data.relatedContentText ?? parent.relatedContentText
+        self.navigationTextAsPreviousPage = data.navigationTextAsPreviousPage ?? parent.navigationTextAsPreviousPage
+        self.navigationTextAsNextPage = data.navigationTextAsNextPage ?? parent.navigationTextAsNextPage
+        self.mostRecentTitle = data.mostRecentTitle ?? parent.mostRecentTitle
+        self.featuredTitle = data.featuredTitle ?? parent.featuredTitle
 
-        guard isComplete else {
+        guard isValid else {
             return nil
         }
     }
 }
-
-// MARK: Thumbnails
-
-extension Element {
-
-    static let defaultThumbnailName = "thumbnail.jpg"
-
-    static func localizedThumbnailName(for language: String) -> String {
-        "thumbnail-\(language).jpg"
-    }
-
-    static func findThumbnail(for language: String, in folder: URL) -> String? {
-        let localizedThumbnail = localizedThumbnailName(for: language)
-        let localizedThumbnailUrl = folder.appendingPathComponent(localizedThumbnail)
-        if localizedThumbnailUrl.exists {
-            return localizedThumbnail
-        }
-        let defaultThumbnailUrl = folder.appendingPathComponent(defaultThumbnailName)
-        if defaultThumbnailUrl.exists {
-            return defaultThumbnailName
-        }
-        return nil
-    }
-}

Sources/Generator/Content/Element.swift

@@ -0,0 +1,799 @@
+import Foundation
+
+struct Element {
+
+    static let overviewItemCountDefault = 6
+
+    /**
+     The default unique id for the root element
+     */
+    static let defaultRootId = "root"
+
+    /**
+     The unique id of the element.
+
+     The id is used for short-hand links to pages, in the form of `![page](page_id)`
+     for thumbnail previews or `[text](page:page_id)` for simple links.
+     - Note: The default id for the root element is specified by ``defaultRootId``
+
+     The id can be manually specified using ``GenericMetadata.id``,
+     otherwise it is set to the name of the element folder.
+     */
+    let id: String
+
+    /**
+     The author of the content.
+
+     If no author is set, then the author from the parent element is used.
+     */
+    let author: String
+
+    /**
+     The title used in the top bar of the website, next to the logo.
+
+     This title can be HTML content, and only the root level value is used.
+     */
+    let topBarTitle: String
+
+    /**
+     The (start) date of the element.
+
+     The date is printed on content pages and may also used for sorting elements,
+     depending on the `useManualSorting` property of the parent.
+     */
+    let date: Date?
+
+    /**
+     The end date of the element.
+
+     This property can be used to specify a date range for a content page.
+     */
+    let endDate: Date?
+
+    /**
+     The deployment state of the page.
+
+     - Note: This property defaults to ``PageState.standard`
+     */
+    let state: PageState
+
+    /**
+     The sort index of the page for manual sorting.
+
+     - Note: This property is only used (and must be set) if `useManualSorting` option of the parent is set.
+     */
+    let sortIndex: Int?
+
+    /**
+     All files which may occur in content but are stored externally.
+
+     Missing files which would otherwise produce a warning are ignored when included here.
+     - Note: This property defaults to an empty set.
+     */
+    let externalFiles: Set<String>
+
+    /**
+     Specifies additional files which should be copied to the destination when generating the content.
+     - Note: This property defaults to an empty set.
+     */
+    let requiredFiles: Set<String>
+
+    /**
+     Additional images required by the element.
+
+     These images are specified as: `source_name destination_name width (height)`.
+     */
+    let images: [ManualImage]
+
+    /**
+     The path to the thumbnail file.
+
+     This property is optional, and defaults to ``GenericMetadata.defaultThumbnailName``.
+     Note: The generator first looks for localized versions of the thumbnail by appending `-[lang]` to the file name,
+     e.g. `customThumb-en.jpg`. If no file is found, then the specified file is tried.
+     */
+    let thumbnailPath: String
+
+    /**
+     The style of thumbnail to use when generating overviews.
+
+     - Note: This property is only relevant for sections.
+     - Note: This property is inherited from the parent if not specified.
+     */
+    let thumbnailStyle: ThumbnailStyle
+
+    /**
+     Sort the child elements by their `sortIndex` property when generating overviews, instead of using the `date`.
+
+     - Note: This property is only relevant for sections.
+     - Note: This property defaults to `false`
+     */
+    let useManualSorting: Bool
+
+    /**
+     The number of items to show when generating overviews of this element.
+     - Note: This property is only relevant for sections.
+     - Note: This property is inherited from the parent if not specified.
+     */
+    let overviewItemCount: Int
+
+    /**
+     Indicate the header type to be generated automatically.
+
+     If this option is set to `none`, then custom header code should be present in the page source files
+     - Note: If not specified, this property defaults to `left`.
+     - Note: Overview pages are always using `center`.
+     */
+    let headerType: HeaderType
+
+    /**
+     Indicate that the overview section should contain a `Newest Content` section before the other sections.
+     - Note: If not specified, this property defaults to `false`
+     */
+    let showMostRecentSection: Bool
+
+    /**
+     Indicate that the overview section should contain a `Featured Content` section before the other sections.
+     The elements are the page ids of the elements contained in the feature.
+     - Note: If not specified, this property defaults to `false`
+     */
+    let featuredPages: [String]
+
+    /**
+     The localized metadata for each language.
+     */
+    let languages: [LocalizedMetadata]
+
+    /**
+     All elements contained within the element.
+
+     If the element is a section, then this property contains the pages or subsections within.
+     */
+    var elements: [Element] = []
+
+    /**
+     The url of the element's folder in the source hierarchy.
+     - Note: This property is essentially the root folder of the site, appended with the value of the ``path`` property.
+     */
+    let inputFolder: URL
+
+    /**
+     The path to the element's folder in the source hierarchy (without a leading slash).
+     */
+    let path: String
+
+    /**
+     Create the root element of a site.
+
+     The root element will recursively move into subfolders and build the site content
+     by looking for metadata files in each subfolder.
+     - Parameter folder: The root folder of the site content.
+     - Note: Uses global objects.
+     */
+    init?(atRoot folder: URL, log: MetadataInfoLogger) {
+        self.inputFolder = folder
+        self.path = ""
+
+        let source = GenericMetadata.metadataFileName
+        guard let metadata = GenericMetadata(source: source, log: log) else {
+            return nil
+        }
+
+        var isValid = true
+
+        self.id = metadata.customId ?? Element.defaultRootId
+        self.author = log.required(metadata.author, name: "author", source: source, &isValid)
+        self.topBarTitle = log.required(metadata.topBarTitle, name: "topBarTitle", source: source, &isValid)
+        self.date = log.castUnused(metadata.date, "date", source: source)
+        self.endDate = log.castUnused(metadata.endDate, "endDate", source: source)
+        self.state = log.cast(metadata.state, "state", source: source)
+        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.thumbnailPath = metadata.thumbnailPath ?? Element.defaultThumbnailName
+        self.thumbnailStyle = log.castUnused(metadata.thumbnailStyle, "thumbnailStyle", source: source)
+        self.useManualSorting = log.unused(metadata.useManualSorting, "useManualSorting", source: source)
+        self.overviewItemCount = metadata.overviewItemCount ?? Element.overviewItemCountDefault
+        self.headerType = log.cast(metadata.headerType, "headerType", source: source)
+        self.showMostRecentSection = metadata.showMostRecentSection ?? false
+        self.featuredPages = metadata.featuredPages ?? []
+        self.languages = log.required(metadata.languages, name: "languages", source: source, &isValid)
+            .compactMap { language in
+                    .init(atRoot: folder, data: language, log: log)
+            }
+        // All properties initialized
+        guard !languages.isEmpty else {
+            log.error("No languages found", source: source)
+            return nil
+        }
+
+        guard isValid else {
+            return nil
+        }
+
+        //files.add(page: path, id: id)
+        self.readElements(in: folder, source: nil, log: log)
+    }
+
+    mutating func readElements(in folder: URL, source: String?, log: MetadataInfoLogger) {
+        let subFolders: [URL]
+        do {
+            subFolders = try FileManager.default
+                .contentsOfDirectory(at: folder, includingPropertiesForKeys: [.isDirectoryKey])
+                .filter { $0.isDirectory }
+        } catch {
+            log.error("Failed to read subfolders: \(error)", source: source ?? "root")
+            return
+        }
+        self.elements = subFolders.compactMap { subFolder in
+            let s = (source.unwrapped { $0 + "/" } ?? "") + subFolder.lastPathComponent
+            return Element(parent: self, folder: subFolder, path: s, log: log)
+        }
+    }
+
+    init?(parent: Element, folder: URL, path: String, log: MetadataInfoLogger) {
+        self.inputFolder = folder
+        self.path = path
+
+        let source = path + "/" + GenericMetadata.metadataFileName
+        guard let metadata = GenericMetadata(source: source, log: log) else {
+            return nil
+        }
+        let state: PageState = log.cast(metadata.state, "state", source: source)
+        guard state != .ignored else {
+            return nil
+        }
+
+        var isValid = true
+
+        self.id = metadata.customId ?? folder.lastPathComponent
+        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.state = state
+        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.thumbnailPath = metadata.thumbnailPath ?? Element.defaultThumbnailName
+        self.thumbnailStyle = log.cast(metadata.thumbnailStyle, "thumbnailStyle", source: source)
+        self.useManualSorting = metadata.useManualSorting ?? false
+        self.overviewItemCount = metadata.overviewItemCount ?? parent.overviewItemCount
+        self.headerType = log.cast(metadata.headerType, "headerType", source: source)
+        self.showMostRecentSection = metadata.showMostRecentSection ?? false
+        self.featuredPages = metadata.featuredPages ?? []
+        self.languages = parent.languages.compactMap { parentData in
+            guard let data = metadata.languages?.first(where: { $0.language == parentData.language }) else {
+                log.warning("Language '\(parentData.language)' not found", source: source)
+                return nil
+            }
+            return .init(folder: folder, data: data, source: source, parent: parentData, log: log)
+        }
+        // Check that each 'language' tag is present, and that all languages appear in the parent
+        log.required(metadata.languages, name: "languages", source: source, &isValid)
+            .compactMap { log.required($0.language, name: "language", source: source, &isValid) }
+            .filter { language in
+                !parent.languages.contains { $0.language == language }
+            }
+            .forEach {
+                log.warning("Language '\($0)' not found in parent, so not generated", source: source)
+            }
+
+        // All properties initialized
+
+        if self.date == nil, !parent.useManualSorting {
+            log.error("No 'date', but parent defines 'useManualSorting' = false", source: source)
+        }
+        if date == nil {
+            log.unused(self.endDate, "endDate", source: source)
+        }
+        if self.sortIndex == nil, state != .hidden, parent.useManualSorting {
+            log.error("No 'sortIndex', but parent defines 'useManualSorting' = true", source: source)
+        }
+
+        guard isValid else {
+            return nil
+        }
+
+        self.readElements(in: folder, source: path, log: log)
+
+        if showMostRecentSection {
+            if elements.isEmpty {
+                log.error("Page has no children", source: source)
+            }
+            languages.filter { $0.mostRecentTitle == nil }.forEach {
+                log.error("'showMostRecentSection' = true, but 'mostRecentTitle' not set for language '\($0.language)'", source: source)
+            }
+        }
+
+        if !featuredPages.isEmpty {
+            if elements.isEmpty {
+                log.error("'featuredPages' contains elements, but page has no children", source: source)
+            }
+            languages.filter { $0.featuredTitle == nil }.forEach {
+                log.error("'featuredPages' contains elements, but 'featuredTitle' not set for language '\($0.language)'", source: source)
+            }
+        }
+    }
+
+    func getExternalPageMap(language: String, log: MetadataInfoLogger) -> [String : String] {
+        var result = [String : String]()
+        if let ext = getExternalLink(for: language) {
+            result[id] = ext
+        } else {
+            result[id] = path + Element.htmlPagePathAddition(for: language)
+        }
+        elements.forEach { element in
+            element.getExternalPageMap(language: language, log: log).forEach { key, value in
+                if result[key] != nil {
+                    log.error("Page id '\(key)' is used twice", source: value)
+                }
+                result[key] = value
+            }
+        }
+        return result
+    }
+
+    private func getExternalLink(for language: String) -> String? {
+        languages.first { $0.language == language }?.externalUrl
+    }
+
+    var needsFirstSection: Bool {
+        showMostRecentSection || !featuredPages.isEmpty
+    }
+
+    var hasVisibleChildren: Bool {
+        !elements.filter { $0.state == .standard }.isEmpty
+    }
+}
+
+// MARK: Paths
+
+extension Element {
+
+    /**
+     The localized html file name for a language, including a leading slash.
+     */
+    static func htmlPagePathAddition(for language: String) -> String {
+        "/" + htmlPageName(for: language)
+    }
+
+    /**
+     The localized html file name for a language, without the leading slash.
+     */
+    static func htmlPageName(for language: String) -> String {
+        "\(language).html"
+    }
+
+    var containsElements: Bool {
+        !elements.isEmpty
+    }
+
+    var hasNestingElements: Bool {
+        elements.contains { $0.hasVisibleChildren }
+    }
+
+    func itemsForOverview(_ count: Int? = nil) -> [Element] {
+        if let shownItemCount = count {
+            return Array(sortedItems.prefix(shownItemCount))
+        } else {
+            return sortedItems
+        }
+    }
+
+    func mostRecentElements(_ count: Int) -> [Element] {
+        guard self.thumbnailStyle == .large else {
+            return []
+        }
+        guard self.containsElements else {
+            return [self]
+        }
+        let all = shownItems
+            .reduce(into: [Element]()) { $0 += $1.mostRecentElements(count) }
+            .filter { $0.thumbnailStyle == .large && $0.state == .standard && $0.date != nil }
+            .sorted { $0.date! > $1.date! }
+        return Array(all.prefix(count))
+    }
+
+    var sortedItems: [Element] {
+        if useManualSorting {
+            return shownItems.sorted { $0.sortIndex! < $1.sortIndex! }
+        }
+        return shownItems.sorted { $0.date! > $1.date! }
+    }
+
+    private var shownItems: [Element] {
+        elements.filter { $0.state.isShownInOverview }
+    }
+
+    var linkedElements: [LinkedElement] {
+        let items = sortedItems.filter { $0.state == .standard }
+        let connected = items.enumerated().map { i, element in
+            let previous = i+1 < items.count ? items[i+1] : nil
+            let next = i > 0 ? items[i-1] : nil
+            return (previous, element, next)
+        }
+        return connected + elements.filter { $0.state != .standard }.map { (nil, $0, nil )}
+    }
+
+    /**
+     The url of the top-level section of the element.
+     */
+    func sectionUrl(for language: String) -> String {
+        path.components(separatedBy: "/").first! + Element.htmlPagePathAddition(for: language)
+    }
+
+    /**
+     Create a relative link to another file in the tree.
+     - Parameter file: The full path of the target file, including localization
+     - Returns: The relative url from a localized page of the element to the target file.
+     */
+    func relativePathToOtherSiteElement(file: String) -> String {
+        guard !file.hasPrefix("/"), !file.hasPrefix("https://"), !file.hasPrefix("http://") else {
+            return file
+        }
+        // Note: The element `path` is missing the last component
+        // i.e. travel/alps instead of travel/alps/en.html
+        let ownParts = path.components(separatedBy: "/")
+        let pageParts = file.components(separatedBy: "/")
+
+        // Find the common elements of the path, which can be discarded
+        var index = 0
+        while index < pageParts.count && index < ownParts.count && pageParts[index] == ownParts[index] {
+            index += 1
+        }
+        // The relative path needs to go down to the first common folder,
+        // before going up to the target page
+        let allParts = [String](repeating: "..", count: ownParts.count-index)
+        + pageParts.dropFirst(index)
+        return allParts.joined(separator: "/")
+    }
+
+    /**
+     The relative path to the site root.
+     */
+    var pathToRoot: String? {
+        guard path != "" else {
+            return nil
+        }
+        let downPathCount = path.components(separatedBy: "/").count
+        return [String](repeating: "..", count: downPathCount).joined(separator: "/")
+    }
+    
+    /**
+     Create an absolute path (relative to the root directory) for a file contained in the elements folder.
+
+     This function is used to copy required input files and to generate images
+     */
+    func pathRelativeToRootForContainedInputFile(_ filePath: String) -> String {
+        Element.relativeToRoot(filePath: filePath, folder: path)
+    }
+
+    /**
+     Create an absolute path (relative to the root directory) for a file contained in the elements folder.
+
+     This function is used to copy required input files and to generate images
+     */
+    func nonAbsolutePathRelativeToRootForContainedInputFile(_ filePath: String) -> String? {
+        Element.containedFileRelativeToRoot(filePath: filePath, folder: path)
+    }
+
+    static func relativeToRoot(filePath: String, folder path: String) -> String {
+        containedFileRelativeToRoot(filePath: filePath, folder: path) ?? filePath
+    }
+
+    static func containedFileRelativeToRoot(filePath: String, folder path: String) -> String? {
+        if path == "" {
+            return filePath
+        }
+        if filePath.hasPrefix("/") || filePath.hasPrefix("http") || filePath.hasPrefix("mailto:") {
+            return nil
+        }
+        return "\(path)/\(filePath)"
+    }
+
+    /**
+     Convert a set of relative paths to paths that are relative to the root element.
+     - Parameter input: The set of paths to convert.
+     - Parameter path: The path to the folder where the paths are currently relative to.
+     */
+    static func rootPaths(for input: Set<String>?, path: String) -> Set<String> {
+        guard let input = input else {
+            return []
+        }
+        return Set(input.map { relativeToRoot(filePath: $0, folder: path) })
+    }
+
+    func relativePathToFileWithPath(_ filePath: String) -> String {
+        guard path != "" else {
+            return filePath
+        }
+        guard filePath.hasPrefix(path) else {
+            return filePath
+        }
+        return filePath.replacingOccurrences(of: path + "/", with: "")
+    }
+}
+
+// MARK: Accessing localizations
+
+extension Element {
+
+    /**
+     The full url (relative to root) for the localized page
+     - Parameter language: The language of the page where the url should point
+     */
+    func fullPageUrl(for language: String) -> String {
+        localized(for: language).externalUrl ?? localizedPath(for: language)
+    }
+
+    func localized(for language: String) -> LocalizedMetadata {
+        languages.first { $0.language == language }!
+    }
+
+    func title(for language: String) -> String {
+        localized(for: language).title
+    }
+
+    /**
+     Get the back link text for the element.
+
+     This text is the one printed for pages of the element, which uses the back text specified by the parent.
+     */
+    func backLinkText(for language: String) -> String {
+        localized(for: language).parentBackLinkText
+    }
+
+    /**
+     The optional text to display in a thumbnail corner.
+     - Note: This text is only displayed for large thumbnails.
+     */
+    func cornerText(for language: String) -> String? {
+        localized(for: language).cornerText
+    }
+
+    /**
+     Returns the full path (relative to the site root for a page of the element in the given language.
+     */
+    func localizedPath(for language: String) -> String {
+        guard path != "" else {
+            return Element.htmlPageName(for: language)
+        }
+        return path + Element.htmlPagePathAddition(for: language)
+    }
+
+    /**
+     Get the next language to switch to with the language button.
+     */
+    func nextLanguage(for language: String) -> String? {
+        let langs = languages.map { $0.language }
+        guard let index = langs.firstIndex(of: language) else {
+            return nil
+        }
+        for i in 1..<langs.count {
+            let next = langs[(index + i) % langs.count]
+            guard hasContent(for: next) else {
+                continue
+            }
+            guard next != language else {
+                return nil
+            }
+
+            return next
+        }
+        return nil
+    }
+
+    func linkPreviewImage(for language: String) -> String? {
+        localized(for: language).linkPreviewImage ?? thumbnailFileName(for: language)
+    }
+}
+
+// MARK: Page content
+
+extension Element {
+
+    var isExternalPage: Bool {
+        languages.contains { $0.externalUrl != nil }
+    }
+
+    /**
+     Get the url of the content markdown file for a language.
+
+     To check if the file also exists, use `existingContentUrl(for:)`
+     */
+    private func contentUrl(for language: String) -> URL {
+        inputFolder.appendingPathComponent("\(language).md")
+    }
+
+    /**
+     Get the url of existing markdown content for a language.
+     */
+    private func existingContentUrl(for language: String) -> URL? {
+        let url = contentUrl(for: language)
+        guard url.exists, let size = url.size, size > 0 else {
+            return nil
+        }
+        return url
+    }
+
+    private func hasContent(for language: String) -> Bool {
+        if !elements.isEmpty {
+            return true
+        }
+        return existingContentUrl(for: language) != nil
+    }
+}
+
+// MARK: Header and Footer
+
+extension Element {
+
+    var additionalHeadContentPath: String {
+        path + "/head.html"
+    }
+
+    var additionalFooterContentPath: String {
+        path + "/footer.html"
+    }
+
+}
+
+// MARK: Debug
+
+extension Element {
+
+    func printTree(indentation: String = "") {
+        print(indentation + "/" + path)
+        elements.forEach { $0.printTree(indentation: indentation + "  ") }
+    }
+}
+
+// MARK: Images
+
+extension Element {
+
+    struct ManualImage {
+
+        let sourcePath: String
+
+        let destinationPath: String
+
+        let desiredWidth: Int
+
+        let desiredHeight: Int?
+
+        init?(input: String, path: String, log: MetadataInfoLogger) {
+            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)
+                return nil
+            }
+            guard let width = Int(parts[2]) else {
+                log.error("Invalid width for image \(parts[0])", source: path)
+                return nil
+            }
+
+            self.sourcePath = Element.relativeToRoot(filePath: parts[0], folder: path)
+            self.destinationPath = Element.relativeToRoot(filePath: parts[1], folder: path)
+            self.desiredWidth = width
+            guard parts.count == 4 else {
+                self.desiredHeight = nil
+                return
+            }
+            guard let height = Int(parts[3]) else {
+                log.error("Invalid height for image \(parts[0])", source: path)
+                return nil
+            }
+            self.desiredHeight = height
+        }
+    }
+}
+
+extension Element {
+
+    /**
+     Find a page by its page ID within the tree of the element.
+     */
+    func find(_ pageId: String) -> Element? {
+        if self.id == pageId {
+            return self
+        }
+        for child in elements {
+            if let found = child.find(pageId) {
+                return found
+            }
+        }
+        return nil
+    }
+
+    var pathComponents: [String] {
+        path.components(separatedBy: "/")
+    }
+
+    var lastPathComponent: String {
+        pathComponents.last!
+    }
+
+    func find(elementWithFolder folder: String) -> Element? {
+        elements.first { $0.lastPathComponent == folder }
+    }
+
+    func makePath(language: String, from root: Element) -> [String] {
+        let parts = pathComponents.dropLast()
+        var result = [String]()
+        var node = root
+        for part in parts {
+            guard let child = node.find(elementWithFolder: part) else {
+                return result
+            }
+            result.append(child.title(for: language))
+            node = child
+        }
+        return result
+    }
+
+    func findParent(from root: Element) -> Element? {
+        var node = root
+        for part in pathComponents.dropLast() {
+            guard let child = node.find(elementWithFolder: part) else {
+                return node
+            }
+            node = child
+        }
+        return node
+    }
+}
+
+// MARK: Thumbnails
+
+extension Element {
+
+    static let defaultThumbnailName = "thumbnail.jpg"
+
+    /**
+     Find the thumbnail for the element.
+
+     This function uses either the custom thumbnail path from the metadata or the default name
+     to find a thumbnail. It first checks if a localized version of the thumbnail exists, or returns the
+     generic version. If no thumbnail image could be found on disk, then an error is logged and the
+     generic path is returned.
+
+     - Parameter language: The language of the thumbnail
+     - Returns: The thumbnail (either the localized or the generic version)
+     */
+    func thumbnailFilePath(for language: String) -> (source: String, destination: String) {
+        let localizedThumbnail = thumbnailPath.insert("-\(language)", beforeLast: ".")
+        let localizedThumbnailUrl = inputFolder.appendingPathComponent(localizedThumbnail)
+
+        if localizedThumbnailUrl.exists {
+            let source = pathRelativeToRootForContainedInputFile(localizedThumbnail)
+            let ext = thumbnailPath.lastComponentAfter(".")
+            let destination = pathRelativeToRootForContainedInputFile("thumbnail-\(language).\(ext)")
+            return (source, destination)
+        }
+        let source = pathRelativeToRootForContainedInputFile(thumbnailPath)
+        let ext = thumbnailPath.lastComponentAfter(".")
+        let destination = pathRelativeToRootForContainedInputFile("thumbnail.\(ext)")
+        return (source, destination)
+    }
+
+    private func thumbnailFileName(for language: String) -> String? {
+        let localizedThumbnailName = thumbnailPath.insert("-\(language)", beforeLast: ".")
+        let localizedThumbnail = pathRelativeToRootForContainedInputFile(localizedThumbnailName)
+        let localizedThumbnailUrl = inputFolder.appendingPathComponent(localizedThumbnail)
+
+        if localizedThumbnailUrl.exists {
+            return localizedThumbnailName
+        }
+
+        let thumbnailUrl = inputFolder.appendingPathComponent(thumbnailPath)
+        if !thumbnailUrl.exists {
+            return nil
+        }
+        return thumbnailPath
+    }
+}

Sources/Generator/Content/GenericMetadata+Localized.swift

@@ -14,8 +14,8 @@ extension GenericMetadata {
         let language: String?
 
         /**
-         - Note: This field is mandatory
          The title used in the page header.
+         - Note: This field is mandatory
          */
         let title: String?
 
@@ -112,6 +112,39 @@ extension GenericMetadata {
          It can also be set to manually write a page.
          */
         let externalUrl: String?
+
+        /**
+         The text to display for content related to the current page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let relatedContentText: String?
+
+        /**
+         The text to display on a navigation element pointing to this element as the previous page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let navigationTextAsPreviousPage: String?
+
+        /**
+         The text to display on the navigation element pointing to this element as the next page.
+
+         This property is mandatory at root level, and is propagated to child elements.
+         */
+        let navigationTextAsNextPage: String?
+
+        /**
+         The text to display above a slideshow for most recent items.
+         Only used for elements that define `showMostRecentSection = true`
+         */
+        let mostRecentTitle: String?
+
+        /**
+         The text to display above a slideshow for featured items.
+         Only used for elements that define `showFeaturedSection = true`
+         */
+        let featuredTitle: String?
     }
 }
 
@@ -134,6 +167,11 @@ extension GenericMetadata.LocalizedMetadata: Codable {
             .thumbnailSuffix,
             .cornerText,
             .externalUrl,
+            .relatedContentText,
+            .navigationTextAsPreviousPage,
+            .navigationTextAsNextPage,
+            .mostRecentTitle,
+            .featuredTitle,
         ]
     }
 
@@ -163,7 +201,12 @@ extension GenericMetadata.LocalizedMetadata {
             titleSuffix: nil,
             thumbnailSuffix: nil,
             cornerText: nil,
-            externalUrl: nil)
+            externalUrl: nil,
+            relatedContentText: nil,
+            navigationTextAsPreviousPage: nil,
+            navigationTextAsNextPage: nil,
+            mostRecentTitle: nil,
+            featuredTitle: nil)
     }
 
     /**
@@ -184,7 +227,12 @@ extension GenericMetadata.LocalizedMetadata {
               titleSuffix: nil,
               thumbnailSuffix: nil,
               cornerText: nil,
-              externalUrl: nil)
+              externalUrl: nil,
+              relatedContentText: "",
+              navigationTextAsPreviousPage: "",
+              navigationTextAsNextPage: "",
+              mostRecentTitle: nil,
+              featuredTitle: nil)
     }
 
     static var full: GenericMetadata.LocalizedMetadata {
@@ -202,6 +250,11 @@ extension GenericMetadata.LocalizedMetadata {
               titleSuffix: "",
               thumbnailSuffix: "",
               cornerText: "",
-              externalUrl: "")
+              externalUrl: "",
+              relatedContentText: "",
+              navigationTextAsPreviousPage: "",
+              navigationTextAsNextPage: "",
+              mostRecentTitle: "",
+              featuredTitle: "")
     }
 }

Sources/Generator/Content/GenericMetadata.swift

@@ -77,6 +77,22 @@ struct GenericMetadata {
      */
     let requiredFiles: Set<String>?
 
+    /**
+     Additional images required by the element.
+
+     These images are specified as: `source_name destination_name width (height)`.
+     */
+    let images: Set<String>?
+
+    /**
+     The path to the thumbnail file.
+
+     This property is optional, and defaults to ``Element.defaultThumbnailName``.
+     Note: The generator first looks for localized versions of the thumbnail by appending `-[lang]` to the file name,
+     e.g. `customThumb-en.jpg`. If no file is found, then the specified file is tried.
+     */
+    let thumbnailPath: String?
+
     /**
      The style of thumbnail to use when generating overviews.
 
@@ -101,12 +117,26 @@ struct GenericMetadata {
     let overviewItemCount: Int?
 
     /**
-     Indicate that no header should be generated automatically.
+     Indicate the header type to be generated automatically.
 
-     This option assumes that custom header code is present in the page source files
-     - Note: If not specified, this property defaults to `false`.
+     If this option is set to `none`, then custom header code should be present in the page source files
+     - Note: If not specified, this property defaults to `left`.
+     - Note: Overview pages are always using `center`.
      */
-    let useCustomHeader: Bool?
+    let headerType: String?
+
+    /**
+     Indicate that the overview section should contain a `Newest Content` section before the other sections.
+     - Note: If not specified, this property defaults to `false`
+     */
+    let showMostRecentSection: Bool?
+
+    /**
+     Indicate that the overview section should contain a `Featured Content` section before the other sections.
+     The elements are the page ids of the elements contained in the feature.
+     - Note: If not specified, this property defaults to `false`
+     */
+    let featuredPages: [String]?
 
     /**
      The localized metadata for each language.
@@ -127,10 +157,14 @@ extension GenericMetadata: Codable {
             .sortIndex,
             .externalFiles,
             .requiredFiles,
+            .images,
+            .thumbnailPath,
             .thumbnailStyle,
             .useManualSorting,
             .overviewItemCount,
-            .useCustomHeader,
+            .headerType,
+            .showMostRecentSection,
+            .featuredPages,
             .languages,
         ]
     }
@@ -150,8 +184,8 @@ extension GenericMetadata {
      - Note: The decoding routine also checks for unknown properties, and writes them to the output.
      - Note: Uses global objects
      */
-    init?(source: String) {
-        guard let data = files.dataOfOptionalFile(atPath: source, source: source) else {
+    init?(source: String, log: MetadataInfoLogger) {
+        guard let data = log.readPotentialMetadata(atPath: source, source: source) else {
             return nil
         }
 
@@ -177,8 +211,7 @@ extension GenericMetadata {
         do {
             self = try decoder.decode(from: data)
         } catch {
-            print("Here \(data)")
-            log.failedToOpen(GenericMetadata.metadataFileName, requiredBy: source, error: error)
+            log.failedToDecodeMetadata(source: source, error: error)
             return nil
         }
     }
@@ -197,10 +230,14 @@ extension GenericMetadata {
             sortIndex: 1,
             externalFiles: [],
             requiredFiles: [],
+            images: [],
+            thumbnailPath: "",
             thumbnailStyle: "",
             useManualSorting: false,
             overviewItemCount: 6,
-            useCustomHeader: false,
+            headerType: "left",
+            showMostRecentSection: false,
+            featuredPages: [],
             languages: [.full])
     }
 }

Sources/Generator/Content/HeaderType.swift

@@ -0,0 +1,35 @@
+import Foundation
+
+enum HeaderType: String {
+
+    /**
+     The standard page header, left-aligned
+     */
+    case left
+
+    /**
+     The standard overview header, centered
+     */
+    case center
+
+    /**
+     The element provides it's own header, so don't generate any.
+     */
+    case none
+}
+
+extension HeaderType: StringProperty {
+
+    init?(_ value: String) {
+        self.init(rawValue: value)
+    }
+
+    static var castFailureReason: String {
+        "Header type must be 'left', 'center' or 'none'"
+    }
+}
+
+extension HeaderType: DefaultValueProvider {
+
+    static var defaultValue: HeaderType { .left }
+}

Sources/Generator/Content/PageState.swift

@@ -15,6 +15,11 @@ enum PageState: String {
      Generate the page, but don't include it in overviews of the parent.
      */
     case hidden
+
+    /**
+     Completely ignore the element.
+     */
+    case ignored
 }
 
 extension PageState {
@@ -23,7 +28,7 @@ extension PageState {
         switch self {
         case .standard, .draft:
             return true
-        case .hidden:
+        case .hidden, .ignored:
             return false
         }
     }
@@ -32,10 +37,24 @@ extension PageState {
         switch self {
         case .standard:
             return true
-        case .draft:
-            return false
-        case .hidden:
+        case .draft, .hidden, .ignored:
             return false
         }
     }
 }
+
+extension PageState: StringProperty {
+
+    init?(_ value: String) {
+        self.init(rawValue: value)
+    }
+
+    static var castFailureReason: String {
+        "Page state must be 'standard', 'draft', 'hidden', or 'ignored'"
+    }
+}
+
+extension PageState: DefaultValueProvider {
+
+    static var defaultValue: PageState { .standard }
+}

Sources/Generator/Content/StringProperty.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+protocol StringProperty {
+
+    init?(_ value: String)
+
+    static var castFailureReason: String { get }
+}

Sources/Generator/Content/ThumbnailStyle.swift

@@ -23,9 +23,9 @@ enum ThumbnailStyle: String, CaseIterable {
         case .large:
             return 374
         case .square:
-            return height
+            return 178
         case .small:
-            return height
+            return 78
         }
     }
 }
@@ -33,3 +33,19 @@ enum ThumbnailStyle: String, CaseIterable {
 extension ThumbnailStyle: Codable {
 
 }
+
+extension ThumbnailStyle: StringProperty {
+
+    init?(_ value: String) {
+        self.init(rawValue: value)
+    }
+
+    static var castFailureReason: String {
+        "Thumbnail style must be 'large', 'square' or 'small'"
+    }
+}
+
+extension ThumbnailStyle: DefaultValueProvider {
+
+    static var defaultValue: ThumbnailStyle { .large }
+}

Sources/Generator/Extensions/Array+Extensions.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+extension Array: DefaultValueProvider {
+
+    static var defaultValue: Array<Element> { [] }
+}

Sources/Generator/Extensions/Bool+Extensions.swift

@@ -0,0 +1,6 @@
+import Foundation
+
+extension Bool: DefaultValueProvider {
+
+    static var defaultValue: Bool { true }
+}

Sources/Generator/Extensions/Date+Extensions.swift

@@ -0,0 +1,26 @@
+import Foundation
+
+extension Date: StringProperty {
+
+    private static let metadataDate: DateFormatter = {
+        let df = DateFormatter()
+        df.dateFormat = "dd.MM.yy"
+        return df
+    }()
+
+    init?(_ value: String) {
+        guard let date = Date.metadataDate.date(from: value) else {
+            return nil
+        }
+        self =  date
+    }
+
+    static var castFailureReason: String {
+        "Date string format must be 'dd.MM.yy'"
+    }
+}
+
+extension Date: DefaultValueProvider {
+
+    static var defaultValue: Date { .init() }
+}

Sources/Generator/Extensions/Digest+Extension.swift

@@ -0,0 +1,13 @@
+import Foundation
+import CryptoKit
+
+extension Digest {
+
+    var bytes: [UInt8] { Array(makeIterator()) }
+
+    var data: Data { Data(bytes) }
+
+    var hexStr: String {
+        bytes.map { String(format: "%02X", $0) }.joined()
+    }
+}

Sources/Generator/Extensions/Int+Extensions.swift

@@ -0,0 +1,13 @@
+import Foundation
+
+extension Int: StringProperty {
+
+    static var castFailureReason: String {
+        "The string was not a valid integer"
+    }
+}
+
+extension Int: DefaultValueProvider {
+
+    static var defaultValue: Int { 0 }
+}

Sources/Generator/Extensions/NSImage+Extensions.swift

@@ -7,8 +7,8 @@ extension NSImage {
         guard self.size.width > size.width else {
             return self
         }
-        return NSImage(size: size, flipped: false) { (resizedRect) -> Bool in
-            self.draw(in: resizedRect)
+        return NSImage(size: size, flipped: false) { [weak self] (resizedRect) -> Bool in
+            self?.draw(in: resizedRect)
             return true
         }
     }

Sources/Generator/Extensions/NSSize+Extensions.swift

@@ -12,7 +12,7 @@ extension NSSize {
             return self
         }
 
-        let height = height * desiredWidth / width
+        let height = (height * desiredWidth / width).rounded(.down)
         return NSSize(width: desiredWidth, height: height)
     }
 }

Sources/Generator/Extensions/Optional+Extensions.swift

@@ -3,7 +3,7 @@ import Metal
 
 extension Optional {
 
-    func unwrapped<T>(_ closure: (Wrapped) -> T) -> T? {
+    func unwrapped<T>(_ closure: (Wrapped) -> T?) -> T? {
         if case let .some(value) = self {
             return closure(value)
         }

Sources/Generator/Extensions/String+Extensions.swift

@@ -20,6 +20,11 @@ extension String {
             .joined(separator: "\n")
     }
 
+    /**
+     Remove the part after the last occurence of the separator (including the separator itself).
+
+     The string is left unchanges, if it does not contain the separator.
+     */
     func dropAfterLast(_ separator: String) -> String {
         guard contains(separator) else {
             return self
@@ -51,6 +56,11 @@ extension String {
         return parts.dropLast().joined(separator: separator) + content + separator + parts.last!
     }
 
+    /**
+     Remove everything behind the first separator.
+
+     Also removes the separator itself. If the separator is not contained in the string, then the full string is returned.
+     */
     func dropAfterFirst<T>(_ separator: T) -> String where T: StringProtocol {
         components(separatedBy: separator).first!
     }
@@ -62,10 +72,25 @@ extension String {
 
 extension Substring {
 
+    func dropBeforeFirst(_ separator: String) -> String {
+        guard contains(separator) else {
+            return String(self)
+        }
+        return components(separatedBy: separator).dropFirst().joined(separator: separator)
+    }
+
     func between(_ start: String, and end: String) -> String {
         components(separatedBy: start).last!
             .components(separatedBy: end).first!
     }
+
+    func between(first: String, andLast last: String) -> String {
+        dropBeforeFirst(first).dropAfterLast(last)
+    }
+
+    func last(after: String) -> String {
+        components(separatedBy: after).last!
+    }
 }
 
 extension String {
@@ -74,3 +99,8 @@ extension String {
         try data(using: .utf8)!.createFolderAndWrite(to: url)
     }
 }
+
+extension String: DefaultValueProvider {
+
+    static var defaultValue: String { "" }
+}

Sources/Generator/Extensions/URL+Extensions.swift

@@ -0,0 +1,72 @@
+import Foundation
+
+extension URL {
+
+    func ensureParentFolderExistence() throws {
+        try deletingLastPathComponent().ensureFolderExistence()
+    }
+
+    func ensureFolderExistence() throws {
+        guard !exists else {
+            return
+        }
+        try FileManager.default.createDirectory(at: self, withIntermediateDirectories: true)
+    }
+
+    var isDirectory: Bool {
+        do {
+            let resources = try resourceValues(forKeys: [.isDirectoryKey])
+            guard let isDirectory = resources.isDirectory else {
+                print("No isDirectory info for \(path)")
+                return false
+            }
+            return isDirectory
+        } catch {
+            print("Failed to get directory information from \(path): \(error)")
+            return false
+        }
+    }
+
+    var exists: Bool {
+        FileManager.default.fileExists(atPath: path)
+    }
+
+    /**
+     Delete the file at the url.
+     */
+    func delete() throws {
+        try FileManager.default.removeItem(at: self)
+    }
+
+    func copy(to url: URL) throws {
+        if url.exists {
+            try url.delete()
+        }
+        try url.ensureParentFolderExistence()
+        try FileManager.default.copyItem(at: self, to: url)
+    }
+
+    var size: Int? {
+        let attributes = try? FileManager.default.attributesOfItem(atPath: path)
+        return (attributes?[.size] as? NSNumber)?.intValue
+    }
+
+    func resolvingFolderTraversal() -> URL? {
+        var components = [String]()
+        absoluteString.components(separatedBy: "/").forEach { part in
+            if part == ".." {
+                if !components.isEmpty {
+                    _ = components.popLast()
+                } else {
+                    components.append("..")
+                }
+                return
+            }
+            if part == "." {
+                return
+            }
+            components.append(part)
+        }
+        return URL(string: components.joined(separator: "/"))
+    }
+}

Sources/Generator/Files/Configuration.swift

@@ -0,0 +1,91 @@
+import Foundation
+
+/**
+ The global configuration of the website.
+ */
+struct Configuration: Codable {
+
+    /**
+     The width of page content in pixels.
+
+     The width specification is used to scale images to the correct width,
+     when images are included in markdown content using the syntax
+     `![](image.jpg)`.
+     - Note: A high-resolution `@2x` version will be generated as well.
+     */
+    let pageImageWidth: Int
+
+    /**
+     The maximum width (in pixels) for images shown full screen.
+     */
+    let fullScreenImageWidth: Int
+
+    /**
+     Automatically minify all `.css` resources which are copied
+     to the output folder.
+     - Note: This option requires the `clean-css` tool,
+     which can be installed using the `install.sh` script in the root folder of the generator.
+     */
+    let minifyCSS: Bool
+
+    /**
+     Automatically minify all `.js` resources which are copied
+     to the output folder.
+     - Note: This option requires the `uglifyjs` tool,
+     which can be installed using the `install.sh` script in the root folder of the generator.
+     */
+    let minifyJavaScript: Bool
+
+    /**
+     The path to the directory where the root element metadata is located.
+     */
+    var contentPath: String
+
+    /**
+     The path where the generated website should be written.
+     */
+    var outputPath: String
+
+    /**
+     Create .md files for content pages, if they don't exist.
+
+     After the languages of the root element are read, the generator looks
+     for localized `.md` files for each page element which has metadata.
+     If it can't find a content file, it generates a placeholder.
+
+     Setting this option to `true` will cause the generator to create empty `.md`
+     files for each root level language. This can be helpful to see which content still needs
+     to be written. There is then also no need to manually create these files.
+
+     - Note: Empty content files will continue to be ignored by the generator,
+     and treated as if they are not present.
+     */
+    let createMdFilesIfMissing: Bool
+
+    var contentDirectory: URL {
+        .init(fileURLWithPath: contentPath)
+    }
+
+    var outputDirectory: URL {
+        .init(fileURLWithPath: outputPath)
+    }
+
+    mutating func adjustPathsRelative(to folder: URL) {
+        if !contentPath.hasPrefix("/") {
+            contentPath = folder.appendingPathComponent(contentPath).resolvingFolderTraversal()!.path
+        }
+        if !outputPath.hasPrefix("/") {
+            outputPath = folder.appendingPathComponent(outputPath).resolvingFolderTraversal()!.path
+        }
+    }
+
+    func printOverview() {
+        print("         Source folder: \(contentDirectory.path)")
+        print("         Output folder: \(outputDirectory.path)")
+        print("            Page width: \(pageImageWidth)")
+        print("     Full-screen width: \(fullScreenImageWidth)")
+        print("     Minify JavaScript: \(minifyJavaScript)")
+        print("            Minify CSS: \(minifyCSS)")
+        print(" Create markdown files: \(createMdFilesIfMissing)")
+    }
+}

Sources/Generator/Files/FileUpdateChecker.swift

@@ -0,0 +1,92 @@
+import Foundation
+import CryptoKit
+
+final class FileUpdateChecker {
+
+    private let hashesFileName = "hashes.json"
+
+    private let input: URL
+    
+    /**
+     The hashes of all accessed files from the previous run
+
+     The key is the relative path to the file from the source
+     */
+    private var previousFiles: [String : Data] = [:]
+
+    /**
+     The paths of all files which were accessed, with their new hashes
+
+     This list is used to check if a file was modified, and to write all accessed files back to disk
+     */
+    private var accessedFiles: [String : Data] = [:]
+
+    var numberOfFilesLoaded: Int {
+        previousFiles.count
+    }
+
+    var numberOfFilesAccessed: Int {
+        accessedFiles.count
+    }
+
+    init(input: URL) {
+        self.input = input
+    }
+
+    enum LoadResult {
+        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)
+        } catch {
+            return .failed("Failed to read hashes from last run: \(error)")
+        }
+        do {
+            self.previousFiles = try JSONDecoder().decode(from: data)
+        } catch {
+            return .failed("Failed to decode hashes from last run: \(error)")
+        }
+        return .loaded
+    }
+
+    func fileHasChanged(at path: String) -> Bool {
+        guard let oldHash = previousFiles[path] else {
+            // Image wasn't used last time, so treat as new
+            return true
+        }
+        guard let newHash = accessedFiles[path] else {
+            // Each image should have been loaded once
+            // before using this function
+            fatalError()
+        }
+        return oldHash != newHash
+    }
+
+    func didLoad(_ data: Data, at path: String) {
+        accessedFiles[path] = SHA256.hash(data: data).data
+    }
+
+    func writeDetectedFileChanges(to folder: URL) -> String? {
+        let url = folder.appendingPathComponent(hashesFileName)
+        do {
+            let encoder = JSONEncoder()
+            encoder.outputFormatting = .prettyPrinted
+            let data = try encoder.encode(accessedFiles)
+            try data.write(to: url)
+            return nil
+        } catch {
+            return "Failed to save file hashes: \(error)"
+        }
+    }
+}
+
+var notFound = 0

Sources/Generator/Files/ImageJob.swift

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

Sources/Generator/Files/ImageReader.swift

@@ -0,0 +1,66 @@
+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/Files/ImageType.swift

@@ -4,6 +4,8 @@ import AppKit
 enum ImageType: CaseIterable {
     case jpg
     case png
+    case avif
+    case webp
 
     init?(fileExtension: String) {
         switch fileExtension {
@@ -11,6 +13,10 @@ enum ImageType: CaseIterable {
             self = .jpg
         case "png":
             self = .png
+        case "avif":
+            self = .avif
+        case "webp":
+            self = .webp
         default:
             return nil
         }
@@ -20,7 +26,7 @@ enum ImageType: CaseIterable {
         switch self {
         case .jpg:
             return .jpeg
-        case .png:
+        case .png, .avif, .webp:
             return .png
         }
     }

Sources/Generator/Files/ValidationLog.swift

@@ -0,0 +1,52 @@
+import Foundation
+
+final class ValidationLog {
+
+    private enum LogLevel: String {
+        case error = "ERROR"
+        case warning = "WARNING"
+        case info = "INFO"
+    }
+
+    init() {
+
+    }
+
+    private func add(_ type: LogLevel, item: ContentError) {
+        let errorText: String
+        if let err = item.error {
+            errorText = ", Error: \(err.localizedDescription)"
+        } else {
+            errorText = ""
+        }
+        print("[\(type.rawValue)][\(item.source)] \(item.reason)\(errorText)")
+    }
+
+    func add(error: ContentError) {
+        add(.error, item: error)
+    }
+
+    func add(error reason: String, source: String, error: Error? = nil) {
+        add(error: .init(reason: reason, source: source, error: error))
+    }
+
+    func add(warning: ContentError) {
+        add(.warning, item: warning)
+    }
+
+    func add(warning reason: String, source: String, error: Error? = nil) {
+        add(warning: .init(reason: reason, source: source, error: error))
+    }
+
+    func add(info: ContentError) {
+        add(.info, item: info)
+    }
+
+    func add(info reason: String, source: String, error: Error? = nil) {
+        add(info: .init(reason: reason, source: source, error: error))
+    }
+
+    func failedToOpen(_ file: String, requiredBy source: String, error: Error?) {
+        print("[ERROR] Failed to open file '\(file)' required by \(source): \(error?.localizedDescription ?? "No error provided")")
+    }
+}

Sources/Generator/Files/VideoType.swift

@@ -3,6 +3,7 @@ import Foundation
 enum VideoType: String, CaseIterable {
     case mp4
     case m4v
+    case webm
 
     var htmlType: String {
         switch self {
@@ -10,6 +11,8 @@ enum VideoType: String, CaseIterable {
             return "video/mp4"
         case .m4v:
             return "video/mp4"
+        case .webm:
+            return "video/webm"
         }
     }
 }

Sources/Generator/Generators/HTMLElementsGenerator.swift

@@ -1,18 +1,18 @@
 import Foundation
 
+typealias SVGSelection = (x: Int, y: Int, width: Int, height: Int)
+
 struct HTMLElementsGenerator {
 
-    init() {
-
-    }
-
     func make(title: String, suffix: String) -> String {
         "\(title)<span class=\"suffix\">\(suffix)</span>"
     }
 
-    // - TODO: Make link relative
-    func topBarWebsiteTitle(language: String) -> String {
-        Element.htmlPagePathAddition(for: language)
+    func topBarWebsiteTitle(language: String, from page: Element) -> String {
+        guard let pathToRoot = page.pathToRoot else {
+            return Element.htmlPageName(for: language)
+        }
+        return pathToRoot + Element.htmlPagePathAddition(for: language)
     }
 
     func topBarLanguageButton(_ language: String) -> String {
@@ -35,20 +35,18 @@ struct HTMLElementsGenerator {
         "\(text)<span class=\"icon-next\"></span>"
     }
 
-    func svgImage(file: String) -> String {
-        """
+    func image(file: String, width: Int, height: Int, altText: String) -> String {
+        let ratio = Float(width) / Float(height)
+        return """
         <span class="image">
-            <img src="\(file)"/>
+            <img src="\(file)" loading="lazy" style="aspect-ratio:\(ratio)" alt="\(altText)"/>
         </span>
         """
     }
 
-    func svgImage(file: String, x: Int, y: Int, width: Int, height: Int) -> String {
-        """
-        <span class="image">
-            <img src="\(file)#svgView(viewBox(\(x), \(y), \(width), \(height)))" style="aspect-ratio:\(Float(width)/Float(height))"/>
-        </span>
-        """
+    func svgImage(file: String, part: SVGSelection, altText: String) -> String {
+        let path = "\(file)#svgView(viewBox(\(part.x), \(part.y), \(part.width), \(part.height)))"
+        return image(file: path, width: part.width, height: part.height, altText: altText)
     }
 
     func downloadButtons(_ buttons: [(file: String, text: String, downloadName: String?)]) -> String {
@@ -101,8 +99,11 @@ struct HTMLElementsGenerator {
         """
     }
 
-    func scriptInclude(path: String) -> String {
-        "<script src=\"\(path)\"></script>"
+    func scriptInclude(path: String, asModule: Bool) -> String {
+        if asModule {
+            return "<script type=\"module\" src=\"\(path)\"></script>"
+        }
+        return "<script src=\"\(path)\"></script>"
     }
 
     func codeHighlightFooter() -> String {

Sources/Generator/Generators/OverviewPageGenerator.swift

@@ -4,15 +4,17 @@ struct OverviewPageGenerator {
 
     private let factory: LocalizedSiteTemplate
 
-    init(factory: LocalizedSiteTemplate) {
+    private let results: GenerationResultsHandler
+
+    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)
 
@@ -21,15 +23,14 @@ struct OverviewPageGenerator {
             let languageButton = section.nextLanguage(for: language)
             content[.topBar] = factory.topBar.generate(
                 sectionUrl: section.sectionUrl(for: language),
-                languageButton: languageButton)
+                languageButton: languageButton,
+                page: section)
+            content[.language] = language
             content[.contentClass] = "overview"
             content[.header] = makeHeader(page: section, metadata: metadata, language: language)
             content[.content] = makeContent(section: section, language: language)
-            content[.footer] = section.customFooterContent()
-            guard factory.page.generate(content, to: url) else {
-                return
-            }
-            log.add(info: "Page generated", source: path)
+            content[.footer] = results.getContentOfOptionalFile(at: section.additionalFooterContentPath, source: section.path)
+            factory.page.generate(content, to: path, source: section.path)
     }
 
     private func makeContent(section: Element, language: String) -> String {

Sources/Generator/Generators/OverviewSectionGenerator.swift

@@ -0,0 +1,112 @@
+import Foundation
+
+struct OverviewSectionGenerator {
+
+    private let factory: TemplateFactory
+
+    private let generator: ThumbnailListGenerator
+
+    private let siteRoot: Element
+
+    private let results: GenerationResultsHandler
+
+    init(factory: TemplateFactory, siteRoot: Element, results: GenerationResultsHandler) {
+        self.factory = factory
+        self.siteRoot = siteRoot
+        self.results = results
+        self.generator = ThumbnailListGenerator(factory: factory, results: results)
+    }
+
+    func generate(sections: [Element], in parent: Element, language: String, sectionItemCount: Int) -> String {
+        let content = sectionsContent(sections, in: parent, language: language, sectionItemCount: sectionItemCount)
+        let firstSection = firstSectionContent(for: parent, language: language, sectionItemCount: sectionItemCount)
+        return firstSection + content
+    }
+
+    private func firstSectionContent(for element: Element, language: String, sectionItemCount: Int) -> String {
+        guard element.needsFirstSection else {
+            return ""
+        }
+        let metadata = element.localized(for: language)
+        var result = ""
+        if element.showMostRecentSection {
+            let shownElements = element.mostRecentElements(4).enumerated().map { (number, child) in
+                makeSlideshowItem(child, parent: element, language: language, number: number)
+            }
+            let title = metadata.mostRecentTitle ?? "Recent"
+            result = factory.slideshow.generate([.content: shownElements.joined(separator: "\n"), .title: title])
+        }
+        if !element.featuredPages.isEmpty {
+            let elements = element.featuredPages.compactMap { id -> Element? in
+                guard let linked = siteRoot.find(id) else {
+                    results.warning("Unknown id '\(id)' in 'featuredPages'", source: element.path)
+                    return nil
+                }
+                return linked
+            }.prefix(4).enumerated().map { number, page in
+                makeSlideshowItem(page, parent: element, language: language, number: number)
+            }
+            let title = metadata.featuredTitle ?? "Featured"
+            result += factory.slideshow.generate([.content: elements.joined(separator: "\n"), .title: title])
+        }
+        return factory.slideshows.generate([.content : result])
+    }
+
+    private func makeSlideshowItem(_ item: Element, parent: Element, language: String, number: Int) -> String {
+        let metadata = item.localized(for: language)
+        var content = [SlideshowImageTemplate.Key : String]()
+        content[.number] = "\(number + 1)"
+        content[.altText] = metadata.linkPreviewDescription
+
+        if item.state.hasThumbnailLink {
+            let fullPageUrl = item.fullPageUrl(for: language)
+            let relativePageUrl = parent.relativePathToFileWithPath(fullPageUrl)
+            content[.url] = "href=\"\(relativePageUrl)\""
+        }
+
+        // Image already assumed to be generated
+        let (_, thumbnailDestPath) = item.thumbnailFilePath(for: language)
+        let thumbnailDestNoExtension = thumbnailDestPath.dropAfterLast(".")
+        content[.image] = parent.relativePathToFileWithPath(thumbnailDestNoExtension)
+
+        if let suffix = metadata.thumbnailSuffix {
+            content[.title] = factory.html.make(title: metadata.title, suffix: suffix)
+        } else {
+            content[.title] = metadata.title
+        }
+        let path = item.makePath(language: language, from: siteRoot)
+        content[.subtitle] = factory.pageLink.makePath(components: path)
+        return factory.slideshowImage.generate(content)
+    }
+
+    private func sectionsContent(_ sections: [Element], in parent: Element, language: String, sectionItemCount: Int) -> String {
+        sections.map { section in
+            let metadata = section.localized(for: language)
+            let fullUrl = section.fullPageUrl(for: language)
+            let relativeUrl = parent.relativePathToFileWithPath(fullUrl)
+
+            var content = [OverviewSectionTemplate.Key : String]()
+            content[.url] = relativeUrl
+            content[.title] = metadata.title
+            content[.items] = generator.generateContent(
+                items: section.itemsForOverview(sectionItemCount),
+                parent: parent,
+                language: language,
+                style: section.thumbnailStyle)
+            content[.more] = metadata.moreLinkText
+
+            return factory.overviewSection.generate(content)
+        }
+        .joined(separator: "\n")
+    }
+
+    func generate(section: Element, language: String) -> String {
+        var content = [OverviewSectionCleanTemplate.Key : String]()
+        content[.items] = generator.generateContent(
+            items: section.itemsForOverview(),
+            parent: section,
+            language: language,
+            style: section.thumbnailStyle)
+        return factory.overviewSectionClean.generate(content)
+    }
+}

Sources/Generator/Generators/PageContentGenerator.swift

@@ -0,0 +1,466 @@
+import Foundation
+import Ink
+import Splash
+
+struct PageContentGenerator {
+
+    private let factory: TemplateFactory
+
+    private let siteRoot: Element
+
+    private let results: GenerationResultsHandler
+
+    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, headers: RequiredHeaders) {
+        let parser = PageContentParser(
+            factory: factory,
+            siteRoot: siteRoot,
+            results: results,
+            page: page, 
+            language: language)
+        return parser.generatePage(from: content)
+    }
+
+}
+
+final class PageContentParser {
+
+    private let pageLinkMarker = "page:"
+
+    private let largeImageIndicator = "*large*"
+
+    private let factory: TemplateFactory
+
+    private let swift = SyntaxHighlighter(format: HTMLOutputFormat())
+
+    private let siteRoot: Element
+
+    private let results: GenerationResultsHandler
+
+    private let page: Element
+
+    private let language: String
+
+    private var headers = RequiredHeaders()
+
+    private var largeImageCount: Int = 0
+
+    init(factory: TemplateFactory, siteRoot: Element, results: GenerationResultsHandler, page: Element, language: String) {
+        self.factory = factory
+        self.siteRoot = siteRoot
+        self.results = results
+        self.page = page
+        self.language = language
+    }
+
+    func generatePage(from content: String) -> (content: String, headers: RequiredHeaders) {
+        headers = .init()
+
+        let imageModifier = Modifier(target: .images) { html, markdown in
+            self.processMarkdownImage(markdown: markdown, html: html)
+        }
+        let codeModifier = Modifier(target: .codeBlocks) { html, markdown in
+            if markdown.starts(with: "```swift") {
+                let code = markdown.between("```swift", and: "```").trimmed
+                return "<pre><code>" + self.swift.highlight(code) + "</pre></code>"
+            }
+            self.headers.insert(.codeHightlighting)
+            return html
+        }
+        let linkModifier = Modifier(target: .links) { html, markdown in
+            self.handleLink(html: html, markdown: markdown)
+        }
+        let htmlModifier = Modifier(target: .html) { html, markdown in
+            self.handleHTML(html: html, markdown: markdown)
+        }
+        let headlinesModifier = Modifier(target: .headings) { html, markdown in
+            self.handleHeadlines(html: html, markdown: markdown)
+        }
+
+        let parser = MarkdownParser(modifiers: [imageModifier, codeModifier, linkModifier, htmlModifier, headlinesModifier])
+        return (parser.html(from: content), headers)
+
+    }
+
+    private func handleLink(html: String, markdown: Substring) -> String {
+        let file = markdown.between("(", and: ")")
+        if file.hasPrefix(pageLinkMarker) {
+            let textToChange = file.dropAfterFirst("#")
+            let pageId = textToChange.replacingOccurrences(of: pageLinkMarker, with: "")
+            guard let pagePath = results.getPagePath(for: pageId, source: page.path, language: language) else {
+                // Remove link since the page can't be found
+                return markdown.between("[", and: "]")
+            }
+            // Adjust file path to get the page url
+            let url = page.relativePathToOtherSiteElement(file: pagePath)
+            return html.replacingOccurrences(of: textToChange, with: url)
+        }
+
+        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)
+        }
+        return html
+    }
+
+    private func handleHTML(html: String, markdown: Substring) -> String {
+        // TODO: Check HTML code in markdown for required resources
+        //print("[HTML] Found in page \(page.path):")
+        //print(markdown)
+        // Things to check:
+        // <img src=
+        // <a href=
+        //
+        return html
+    }
+
+    private func handleHeadlines(html: String, markdown: Substring) -> String {
+        let id = markdown
+            .last(after: "#")
+            .trimmed
+            .filter { $0.isNumber || $0.isLetter || $0 == " " }
+            .lowercased()
+            .components(separatedBy: " ")
+            .filter { $0 != "" }
+            .joined(separator: "-")
+        let parts =  html.components(separatedBy: ">")
+        return parts[0] + " id=\"\(id)\">" + parts.dropFirst().joined(separator: ">")
+    }
+
+    private func processMarkdownImage(markdown: Substring, html: String) -> String {
+        // Split the markdown ![alt](file title)
+        // There are several known shorthand commands
+        // For images: ![*large* left_title](file right_title)
+        // For videos: ![option1,option2,...](file)
+        // For svg with custom area: ![x,y,width,height](file.svg)
+        // For downloads: ![download](file1, text1; file2, text2, (download-name); ...)
+        // For a simple box: ![box](title;body)
+        // For 3D models: ![3d](file;Description)
+        // A fancy page link: ![page](page_id)
+        // External pages: ![external](url1, text1; url2, text2, ...)
+        guard let fileAndTitle = markdown.between(first: "](", andLast: ")").removingPercentEncoding else {
+            results.warning("Invalid percent encoding for markdown image", source: page.path)
+            return ""
+        }
+        let alt = markdown.between("[", and: "]").nonEmpty?.removingPercentEncoding
+        if let alt = alt, let command = ShorthandMarkdownKey(rawValue: alt) {
+            return handleShortHandCommand(command, content: fileAndTitle)
+        }
+
+        let file = fileAndTitle.dropAfterFirst(" ")
+        let title = fileAndTitle.contains(" ") ? fileAndTitle.dropBeforeFirst(" ").nonEmpty : nil
+
+        let fileExtension = file.lastComponentAfter(".").lowercased()
+        if let _ = ImageType(fileExtension: fileExtension) {
+            return handleImage(file: file, rightTitle: title, leftTitle: alt, largeImageCount: &largeImageCount)
+        }
+        if let _ = VideoType(rawValue: fileExtension) {
+            return handleVideo(file: file, optionString: alt)
+        }
+        switch fileExtension {
+        case "svg":
+            return handleSvg(file: file, area: alt)
+        case "gif":
+            return handleGif(file: file, altText: alt ?? "gif image")
+        default:
+            return handleFile(file: file, fileExtension: fileExtension)
+        }
+    }
+
+    private func handleShortHandCommand(_ command: ShorthandMarkdownKey, content: String) -> String {
+        switch command {
+        case .downloadButtons:
+            return handleDownloadButtons(content: content)
+        case .externalLink:
+            return handleExternalButtons(content: content)
+        case .includedHtml:
+            return handleExternalHTML(file: content)
+        case .box:
+            return handleSimpleBox(content: content)
+        case .pageLink:
+            return handlePageLink(pageId: content)
+        case .model3d:
+            return handle3dModel(content: content)
+        }
+    }
+
+    private func handleImage(file: String, rightTitle: String?, leftTitle: String?, largeImageCount: inout Int) -> String {
+        let imagePath = page.pathRelativeToRootForContainedInputFile(file)
+        let left: String
+        let createFullScreenVersion: Bool
+        if let leftTitle {
+            createFullScreenVersion = leftTitle.hasPrefix(largeImageIndicator)
+            left = leftTitle.dropBeforeFirst(largeImageIndicator).trimmed
+        } else {
+            left = ""
+            createFullScreenVersion = false
+        }
+        let size = results.requireFullSizeMultiVersionImage(
+            source: imagePath,
+            destination: imagePath,
+            requiredBy: page.path)
+
+        let altText = left.nonEmpty ?? rightTitle ?? "image"
+
+        var content = [PageImageTemplateKey : String]()
+        content[.altText] = altText
+        content[.image] = file.dropAfterLast(".")
+        content[.imageExtension] = file.lastComponentAfter(".")
+        content[.width] = "\(Int(size.width))"
+        content[.height] = "\(Int(size.height))"
+        content[.leftText] = left
+        content[.rightText] = rightTitle ?? ""
+
+        guard createFullScreenVersion else {
+            return factory.image.generate(content)
+        }
+
+        results.requireOriginalSizeImages(
+            source: imagePath,
+            destination: imagePath,
+            requiredBy: page.path)
+
+        largeImageCount += 1
+        content[.number] = "\(largeImageCount)"
+        return factory.largeImage.generate(content)
+    }
+
+    private func handleVideo(file: String, optionString: String?) -> String {
+        let options: [PageVideoTemplate.VideoOption] = optionString.unwrapped { string in
+            string.components(separatedBy: " ").compactMap { optionText -> PageVideoTemplate.VideoOption? 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)
+                    return nil
+                }
+                return option
+            }
+        } ?? []
+
+        let prefix = file.lastComponentAfter("/").dropAfterLast(".")
+
+        // Find all video files starting with the name of the video as a prefix
+        var sources: [PageVideoTemplate.VideoSource] = []
+        do {
+            let folder = results.contentFolder.appendingPathComponent(page.path)
+            let filesInFolder = try FileManager.default.contentsOfDirectory(atPath: folder.path)
+            sources += selectVideoFiles(with: prefix, from: filesInFolder)
+        } catch {
+            results.warning("Failed to check for additional videos", source: page.path)
+        }
+        // Also look in external files
+        sources += selectVideoFiles(with: prefix, from: page.externalFiles)
+            .map { (page.relativePathToFileWithPath($0.url), $0.type) }
+
+        // Require all video files
+        sources.forEach {
+            let path = page.pathRelativeToRootForContainedInputFile($0.url)
+            results.require(file: path, source: page.path)
+        }
+        // Sort, so that order of selection in browser is defined
+        sources.sort { $0.url < $1.url }
+        return factory.video.generate(sources: sources, options: options)
+    }
+
+    private func selectVideoFiles<T>(with prefix: String, from all: T) -> [PageVideoTemplate.VideoSource] where T: Sequence, T.Element == String {
+        all.compactMap {
+                guard $0.lastComponentAfter("/").hasPrefix(prefix) else {
+                    return nil
+                }
+                guard let type = VideoType(rawValue: $0.lastComponentAfter(".").lowercased()) else {
+                    return nil
+                }
+                return (url: $0, type: type)
+            }
+    }
+
+    private func handleGif(file: String, altText: String) -> String {
+        let imagePath = page.pathRelativeToRootForContainedInputFile(file)
+        results.require(file: imagePath, source: page.path)
+
+        guard let size = results.getImageSize(atPath: imagePath, source: page.path) else {
+            return ""
+        }
+        let width = Int(size.width)
+        let height = Int(size.height)
+        return factory.html.image(file: file, width: width, height: height, altText: altText)
+    }
+
+    private func handleSvg(file: String, area: String?) -> String {
+        let imagePath = page.pathRelativeToRootForContainedInputFile(file)
+        results.require(file: imagePath, source: page.path)
+
+        guard let size = results.getImageSize(atPath: imagePath, source: page.path) else {
+            return "" // Missing image warning already produced
+        }
+        let width = Int(size.width)
+        let height = Int(size.height)
+
+        var altText = "image " + file.lastComponentAfter("/")
+        guard let area = area else {
+            return factory.html.image(file: file, width: width, height: height, altText: altText)
+        }
+        let parts = area.components(separatedBy: ",").map { $0.trimmed }
+        switch parts.count {
+        case 1:
+            return factory.html.image(file: file, width: width, height: height, altText: parts[0])
+        case 4:
+            break
+        case 5:
+            altText = parts[4]
+        default:
+            results.warning("Invalid area string for svg image", source: page.path)
+            return factory.html.image(file: file, width: width, height: height, altText: altText)
+        }
+        guard let x = Int(parts[0]),
+              let y = Int(parts[1]),
+              let partWidth = Int(parts[2]),
+              let partHeight = Int(parts[3]) else {
+            results.warning("Invalid area string for svg image", source: page.path)
+            return factory.html.image(file: file, width: width, height: height, altText: altText)
+        }
+        let part = SVGSelection(x, y, partWidth, partHeight)
+        return factory.html.svgImage(file: file, part: part, altText: altText)
+    }
+
+    private func handleFile(file: String, fileExtension: String) -> String {
+        results.warning("Unhandled file \(file) with extension \(fileExtension)", source: page.path)
+        return ""
+    }
+
+    private func handleDownloadButtons(content: String) -> String {
+        let buttons = content
+            .components(separatedBy: ";")
+            .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 download definition with \(parts)", source: page.path)
+                    return nil
+                }
+                let file = parts[0].trimmed
+                let title = parts[1].trimmed
+                let downloadName = parts.count == 3 ? parts[2].trimmed : nil
+
+                // Ensure that file is available
+                let filePath = page.pathRelativeToRootForContainedInputFile(file)
+                results.require(file: filePath, source: page.path)
+
+                return (file, title, downloadName)
+            }
+        return factory.html.downloadButtons(buttons)
+    }
+
+    private func handleExternalButtons(content: String) -> String {
+        let buttons = content
+            .components(separatedBy: ";")
+            .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)
+                    return nil
+                }
+                guard let url = parts[0].trimmed.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
+                    results.warning("Invalid external link \(parts[0].trimmed)", source: page.path)
+                    return nil
+                }
+                let title = parts[1].trimmed
+
+                return (url, title)
+            }
+        return factory.html.externalButtons(buttons)
+    }
+
+    private func handleExternalHTML(file: String) -> String {
+        let path = page.pathRelativeToRootForContainedInputFile(file)
+        return results.getContentOfRequiredFile(at: path, source: page.path) ?? ""
+    }
+
+    private func handleSimpleBox(content: String) -> String {
+        let parts = content.components(separatedBy: ";")
+        guard parts.count > 1 else {
+            results.warning("Invalid box specification", source: page.path)
+            return ""
+        }
+        let title = parts[0]
+        let text = parts.dropFirst().joined(separator: ";")
+        return factory.makePlaceholder(title: title, text: text)
+    }
+
+    private func handlePageLink(pageId: String) -> String {
+        guard let linkedPage = siteRoot.find(pageId) else {
+            // Checking the page path will add it to the missing pages
+            _ = results.getPagePath(for: pageId, source: page.path, language: language)
+            // Remove link since the page can't be found
+            return ""
+        }
+        guard linkedPage.state == .standard else {
+            // Prevent linking to unpublished content
+            return ""
+        }
+        var content = [PageLinkTemplate.Key: String]()
+        
+        content[.title] = linkedPage.title(for: language)
+        content[.altText] = ""
+
+        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)
+
+        if linkedPage.state.hasThumbnailLink {
+            let fullPageUrl = linkedPage.fullPageUrl(for: language)
+            let relativePageUrl = page.relativePathToOtherSiteElement(file: fullPageUrl)
+            content[.url] = "href=\"\(relativePageUrl)\""
+        }
+
+        content[.image] = relativeImageUrl.dropAfterLast(".")
+        if let suffix = metadata.thumbnailSuffix {
+            content[.title] = factory.html.make(title: metadata.title, suffix: suffix)
+        } else {
+            content[.title] = metadata.title
+        }
+
+        let path = linkedPage.makePath(language: language, from: siteRoot)
+        content[.path] = factory.pageLink.makePath(components: path)
+
+        content[.description] = metadata.relatedContentText
+        if let parent = linkedPage.findParent(from: siteRoot), parent.thumbnailStyle == .large {
+            content[.className] = " related-page-link-large"
+        }
+
+        // We assume that the thumbnail images are already required by overview pages.
+        return factory.pageLink.generate(content)
+    }
+
+    private func handle3dModel(content: String) -> String {
+        let parts = content.components(separatedBy: ";")
+        guard parts.count > 1 else {
+            results.warning("Invalid 3d model specification", source: page.path)
+            return ""
+        }
+        let file = parts[0]
+        guard file.hasSuffix(".glb") else {
+            results.warning("Invalid 3d model file \(file) (must be .glb)", source: page.path)
+            return ""
+        }
+
+        // Ensure that file is available
+        let filePath = page.pathRelativeToRootForContainedInputFile(file)
+        results.require(file: filePath, source: page.path)
+
+        // Add required file to head
+        headers.insert(.modelViewer)
+
+        let description = parts.dropFirst().joined(separator: ";")
+        return """
+        <model-viewer alt="\(description)" src="\(file)" ar shadow-intensity="1" camera-controls touch-action="pan-y"></model-viewer>
+        """
+    }
+}

Sources/Generator/Generators/PageGenerator.swift

@@ -0,0 +1,100 @@
+import Foundation
+import Ink
+
+struct PageGenerator {
+
+    private let factory: LocalizedSiteTemplate
+
+    private let contentGenerator: PageContentGenerator
+
+    private let results: GenerationResultsHandler
+
+    init(factory: LocalizedSiteTemplate, siteRoot: Element, results: GenerationResultsHandler) {
+        self.factory = factory
+        self.results = results
+        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, additionalHeaders) = makeContent(
+            page: page, metadata: metadata, language: language, path: inputContentPath)
+
+        var content = [PageTemplate.Key : String]()
+        content[.language] = language
+        content[.head] = factory.pageHead.generate(page: page, language: language, headers: additionalHeaders)
+        let sectionUrl = page.sectionUrl(for: language)
+        content[.topBar] = factory.topBar.generate(sectionUrl: sectionUrl, languageButton: nextLanguage, page: page)
+        content[.contentClass] = "content"
+
+        content[.header] = makeHeader(page: page, metadata: metadata, language: language)
+        content[.content] = pageContent
+        content[.previousPageLinkText] = previousText(for: previousPage, language: language)
+        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)
+
+        if additionalHeaders.contains(.codeHightlighting) {
+            let highlightCode = factory.factory.html.codeHighlightFooter()
+            content[.footer] = (content[.footer].unwrapped { $0 + "\n" } ?? "") + highlightCode
+        }
+
+        if page.state == .draft {
+            results.markPageAsDraft(page: page.path)
+        }
+        factory.page.generate(content, to: path, source: page.path)
+    }
+
+    private func navLink(from element: Element, to destination: Element?, language: String) -> String? {
+        guard let fullPath = destination?.fullPageUrl(for: language) else {
+            return nil
+        }
+        return element.relativePathToOtherSiteElement(file: fullPath)
+    }
+
+    private func previousText(for element: Element?, language: String) -> String? {
+        guard let text = element?.localized(for: language).navigationTextAsPreviousPage else {
+            return nil
+        }
+        return factory.factory.html.makePrevText(text)
+    }
+
+    private func nextText(for element: Element?, language: String) -> String? {
+        guard let text = element?.localized(for: language).navigationTextAsNextPage else {
+            return nil
+        }
+        return factory.factory.html.makeNextText(text)
+    }
+
+    private func makeContent(page: Element, metadata: Element.LocalizedMetadata, language: String, path: String) -> (content: String, headers: RequiredHeaders) {
+        if let raw = results.getContentOfMdFile(at: path, source: page.path)?.trimmed.nonEmpty {
+            let (content, includesCode) = contentGenerator.generate(page: page, language: language, content: raw)
+            return (content, includesCode)
+        } 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)
+        }
+    }
+
+    private func makeHeader(page: Element, metadata: Element.LocalizedMetadata, language: String) -> String? {
+        let content = factory.makeHeaderContent(page: page, metadata: metadata, language: language)
+        switch page.headerType {
+        case .none:
+            return nil
+        case .left:
+            return factory.factory.leftHeader.generate(content)
+        case .center:
+            return factory.factory.centeredHeader.generate(content)
+        }
+    }
+
+}

Sources/Generator/Generators/PageHeadGenerator.swift

@@ -2,15 +2,19 @@ import Foundation
 
 struct PageHeadGenerator {
 
+    // TODO: Add to configuration
     static let linkPreviewDesiredImageWidth = 1600
 
     let factory: TemplateFactory
 
-    init(factory: TemplateFactory) {
+    private let results: GenerationResultsHandler
+
+    init(factory: TemplateFactory, results: GenerationResultsHandler) {
         self.factory = factory
+        self.results = results
     }
 
-    func generate(page: Element, language: String, includesCode: Bool = false) -> String {
+    func generate(page: Element, language: String, headers: RequiredHeaders = .init()) -> String {
         let metadata = page.localized(for: language)
 
         var content = [PageHeadTemplate.Key : String]()
@@ -21,27 +25,27 @@ struct PageHeadGenerator {
             // Note: Generate separate destination link for the image,
             // since we don't want a single large image for thumbnails.
             // Warning: Link preview source path must be relative to root
-            let linkPreviewImageName = image.insert("-link", beforeLast: ".")
+            let linkPreviewImageName = "thumbnail-link.\(image.lastComponentAfter("."))"
             let sourceImagePath = page.pathRelativeToRootForContainedInputFile(image)
             let destinationImagePath = page.pathRelativeToRootForContainedInputFile(linkPreviewImageName)
-            files.requireImage(
+            results.requireSingleImage(
                 source: sourceImagePath,
                 destination: destinationImagePath,
+                requiredBy: page.path,
                 width: PageHeadGenerator.linkPreviewDesiredImageWidth)
             content[.image] =  factory.html.linkPreviewImage(file: linkPreviewImageName)
         }
-        content[.customPageContent] = page.customHeadContent()
-        if includesCode {
-            let scriptPath = "/assets/js/highlight.js"
-            #warning("Make highlight script path relative")
-            let includeText = factory.html.scriptInclude(path: scriptPath)
-            if let head = content[.customPageContent] {
-                content[.customPageContent] = head + "\n" + includeText
-            } else {
-                content[.customPageContent] = includeText
-            }
+        content[.customPageContent] = results.getContentOfOptionalFile(at: page.additionalHeadContentPath, source: page.path)
+
+        let head = (content[.customPageContent].unwrapped { [$0] } ?? []) + headers
+            .sorted { $0.rawValue < $1.rawValue }
+            .map { option in
+                let scriptPath = "assets/js/\(option.rawValue)"
+                let relative = page.relativePathToOtherSiteElement(file: scriptPath)
+                return factory.html.scriptInclude(path: relative, asModule: option.asModule)
             }
 
+        content[.customPageContent] = head.joined(separator: "\n")
         return factory.pageHead.generate(content)
     }
 }

Sources/Generator/Generators/ShorthandMarkdownKey.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+enum ShorthandMarkdownKey: String {
+
+    /**
+     A variable number of download buttons for file downloads
+     */
+    case downloadButtons = "download"
+
+    /**
+     A large button to an external page.
+     */
+    case externalLink = "external"
+
+    /**
+     Additional HTML code include verbatim into the page.
+     */
+    case includedHtml = "html"
+
+    /**
+     A box with a heading and a text description
+     */
+    case box = "box"
+
+    /**
+     A pretty link to another page on the site.
+     */
+    case pageLink = "page"
+
+    /**
+     A 3D model to display
+     */
+    case model3d = "3d"
+}

Sources/Generator/Generators/SiteGenerator.swift

@@ -0,0 +1,65 @@
+import Foundation
+
+typealias LinkedElement = (previous: Element?, element: Element, next: Element?)
+
+struct SiteGenerator {
+
+    let templates: TemplateFactory
+
+    let results: GenerationResultsHandler
+
+    init(results: GenerationResultsHandler) throws {
+        self.results = results
+        let templatesFolder = results.contentFolder.appendingPathComponent("templates")
+        self.templates = try TemplateFactory(templateFolder: templatesFolder, results: results)
+    }
+
+    func generate(site: Element) {
+        site.languages.forEach {
+            generate(site: site, metadata: $0)
+        }
+    }
+
+    private func generate(site: Element, metadata: Element.LocalizedMetadata) {
+        let language = metadata.language
+        let template = LocalizedSiteTemplate(
+            factory: templates,
+            language: language,
+            site: site,
+            results: results)
+
+        // Generate sections
+        let overviewGenerator = OverviewPageGenerator(factory: template, results: results)
+        let pageGenerator = PageGenerator(factory: template, siteRoot: site, results: results)
+        
+        var elementsToProcess: [LinkedElement] = [(nil, site, nil)]
+        while let (previous, element, next) = elementsToProcess.popLast() {
+            // Move recursively down to all pages
+            elementsToProcess.append(contentsOf: element.linkedElements)
+
+            processAllFiles(for: element)
+            if element.hasVisibleChildren {
+                overviewGenerator.generate(section: element, language: language)
+            } else {
+                pageGenerator.generate(
+                    page: element,
+                    language: language,
+                    previousPage: previous,
+                    nextPage: next)
+            }
+        }
+    }
+
+    private func processAllFiles(for element: Element) {
+        element.externalFiles.forEach { results.exclude(file: $0, source: element.path) }
+        element.requiredFiles.forEach { results.require(file: $0, source: element.path) }
+        element.images.forEach {
+            results.requireSingleImage(
+                source: $0.sourcePath,
+                destination: $0.destinationPath,
+                requiredBy: element.path,
+                width: $0.desiredWidth,
+                desiredHeight: $0.desiredHeight)
+        }
+    }
+}

Sources/Generator/Generators/ThumbnailListGenerator.swift

@@ -4,8 +4,11 @@ struct ThumbnailListGenerator {
 
     private let factory: TemplateFactory
 
-    init(factory: TemplateFactory) {
+    private let results: GenerationResultsHandler
+
+    init(factory: TemplateFactory, results: GenerationResultsHandler) {
         self.factory = factory
+        self.results = results
     }
 
     func generateContent(items: [Element], parent: Element, language: String, style: ThumbnailStyle) -> String {
@@ -14,42 +17,37 @@ struct ThumbnailListGenerator {
     }
 
     private func itemContent(_ item: Element, parent: Element, language: String, style: ThumbnailStyle) -> String {
-        let fullThumbnailPath = item.thumbnailFilePath(for: language)
-        let relativeImageUrl = parent.relativePathToFileWithPath(fullThumbnailPath)
+
         let metadata = item.localized(for: language)
         var content = [ThumbnailKey : String]()
 
         if item.state.hasThumbnailLink {
-            #warning("If page in language is missing, link to different language")
             let fullPageUrl = item.fullPageUrl(for: language)
             let relativePageUrl = parent.relativePathToFileWithPath(fullPageUrl)
             content[.url] = "href=\"\(relativePageUrl)\""
         }
 
-        content[.image] = relativeImageUrl
+        let (thumbnailSourcePath, thumbnailDestPath) = item.thumbnailFilePath(for: language)
+        let thumbnailDestNoExtension = thumbnailDestPath.dropAfterLast(".")
+        content[.image] = parent.relativePathToFileWithPath(thumbnailDestNoExtension)
+        content[.altText] = metadata.linkPreviewDescription
+
         if style == .large, let suffix = metadata.thumbnailSuffix {
             content[.title] = factory.html.make(title: metadata.title, suffix: suffix)
         } else {
             content[.title] = metadata.title
         }
-        content[.image2x] = relativeImageUrl.insert("@2x", beforeLast: ".")
         content[.corner] = item.cornerText(for: language).unwrapped {
             factory.largeThumbnail.makeCorner(text: $0)
         }
 
-        files.requireImage(
-            source: fullThumbnailPath,
-            destination: fullThumbnailPath,
+        results.requireMultiVersionImage(
+            source: thumbnailSourcePath,
+            destination: thumbnailDestNoExtension + ".jpg",
+            requiredBy: item.path,
             width: style.width,
             desiredHeight: style.height)
 
-        // Create image version for high-resolution screens
-        files.requireImage(
-            source: fullThumbnailPath,
-            destination: fullThumbnailPath.insert("@2x", beforeLast: "."),
-            width: style.width * 2,
-            desiredHeight: style.height * 2)
-
         return factory.thumbnail(style: style).generate(content, shouldIndent: false)
     }
 }

Sources/Generator/Processing/DependencyCheck.swift

@@ -0,0 +1,119 @@
+import Foundation
+
+func checkDependencies() -> Bool {
+    print("--- DEPENDENCIES -----------------------------------")
+    print("                                                    ")
+    defer { print("                                                    ") }
+    var valid = true
+    valid = checkImageOptimAvailability() && valid
+    valid = checkMagickAvailability() && valid
+    valid = checkCwebpAvailability() && valid
+    valid = checkAvifAvailability() && valid
+    valid = checkUglifyJsAvailability() && valid
+    valid = checkCleanCssAvailability() && valid
+    return valid
+}
+
+private func checkImageOptimAvailability() -> Bool {
+    do {
+        let output = try safeShell("imageoptim --version")
+        let version = output.components(separatedBy: ".").compactMap { Int($0.trimmed) }
+        if version.count > 1 {
+            print("            ImageOptim: \(version.map { "\($0)" }.joined(separator: "."))")
+        } else {
+            print("            ImageOptim: Not found, download app from https://imageoptim.com/mac and install using 'npm install imageoptim-cli'")
+            return false
+        }
+    } catch {
+        print("            ImageOptim: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}
+
+private func checkMagickAvailability() -> Bool {
+    do {
+        let output = try safeShell("magick --version")
+        guard let version = output.components(separatedBy: "ImageMagick ").dropFirst().first?
+            .components(separatedBy: " ").first else {
+            print("                Magick: Not found, install using 'brew install imagemagick'")
+            return false
+        }
+        print("                Magick: \(version)")
+    } catch {
+        print("                Magick: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}
+
+private func checkCwebpAvailability() -> Bool {
+    do {
+        let output = try safeShell("cwebp -version")
+        let version = output.components(separatedBy: ".").compactMap { Int($0.trimmed) }
+        if version.count > 1 {
+            print("                 cwebp: \(version.map { "\($0)" }.joined(separator: "."))")
+        } else {
+            print("                 cwebp: Not found, download from https://developers.google.com/speed/webp/download")
+            return false
+        }
+    } catch {
+        print("                 cwebp: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}
+
+private func checkAvifAvailability() -> Bool {
+    do {
+        let output = try safeShell("npx avif --version")
+        let version = output.components(separatedBy: ".").compactMap { Int($0.trimmed) }
+        if version.count > 1 {
+            print("                  avif: \(version.map { "\($0)" }.joined(separator: "."))")
+        } else {
+            print("                  avif: Not found, install using 'npm install avif'")
+            return false
+        }
+    } catch {
+        print("                  avif: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}
+
+
+private func checkUglifyJsAvailability() -> Bool {
+    do {
+        let output = try safeShell("uglifyjs --version")
+        let version = output.dropBeforeFirst("uglify-js").components(separatedBy: ".").compactMap { Int($0.trimmed) }
+        if version.count > 1 {
+            print("             uglify-js: \(version.map { "\($0)" }.joined(separator: "."))")
+        } else {
+            print("'\(output)'")
+            print("             uglify-js: Not found, install using 'npm install uglify-js'")
+            return false
+        }
+    } catch {
+        print("             uglify-js: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}
+
+
+private func checkCleanCssAvailability() -> Bool {
+    do {
+        let output = try safeShell("cleancss --version")
+        let version = output.components(separatedBy: ".").compactMap { Int($0.trimmed) }
+        if version.count > 1 {
+            print("              cleancss: \(version.map { "\($0)" }.joined(separator: "."))")
+        } else {
+            print("              cleancss: Not found, install using 'npm install clean-css-cli'")
+            return false
+        }
+    } catch {
+        print("              cleancss: Failed to get version (\(error))")
+        return false
+    }
+    return true
+}

Sources/Generator/Processing/FileData.swift

@@ -0,0 +1,20 @@
+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

@@ -0,0 +1,277 @@
+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("")
+    }
+
+    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) {
+        guard !unreadableFiles.isEmpty || !unwritableFiles.isEmpty || !failedMinifications.isEmpty || !missingFiles.isEmpty || !copiedFiles.isEmpty || !minifiedFiles.isEmpty || !files.expected.isEmpty || !files.external.isEmpty else {
+            do {
+                if FileManager.default.fileExists(atPath: file.path) {
+                    try FileManager.default.removeItem(at: file)
+                }
+            } catch {
+                print("    Failed to delete file log: \(error)")
+            }
+            return
+        }
+        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))" }
+        add("External files", files.external) { "\($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 file log: \(error)")
+        }
+    }
+}

Sources/Generator/Processing/GenerationResultsHandler.swift

@@ -0,0 +1,492 @@
+import Foundation
+import CryptoKit
+import AppKit
+
+
+enum MinificationType {
+    case js
+    case css
+}
+
+typealias PageMap = [(language: String, pages: [String : String])]
+
+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 pageMap: PageMap
+
+    private let configuration: Configuration
+
+    private var numberOfProcessedPages = 0
+
+    private let numberOfTotalPages: Int
+
+    init(in input: URL, to output: URL, configuration: Configuration, fileUpdates: FileUpdateChecker, pageMap: PageMap, pageCount: Int) {
+        self.contentFolder = input
+        self.fileUpdates = fileUpdates
+        self.outputFolder = output
+        self.pageMap = pageMap
+        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, language: String) -> String? {
+        guard let pagePath = pageMap.first(where: { $0.language == language})?.pages[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.minifyJavaScript, ext == "js" {
+            files.toMinify[file] = (source, .js)
+            return
+        }
+        if configuration.minifyCSS, 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)
+    }
+
+    func requireOriginalSizeImages(
+        source: String,
+        destination: String,
+        requiredBy path: String) {
+            _ = requireScaledMultiImage(
+                source: source,
+                destination: destination.insert("@full", beforeLast: "."),
+                requiredBy: path,
+                width: configuration.fullScreenImageWidth,
+                desiredHeight: nil)
+        }
+
+    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[path] = source
+    }
+
+    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
+    }
+
+    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("Existing job with width \(existingJob.width) (from \(existingJob.path)), but 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) {
+        guard !missingFiles.isEmpty || !unreadableFiles.isEmpty || !unwritableFiles.isEmpty || !missingLinkedPages.isEmpty || !pageWarnings.isEmpty || !generatedFiles.isEmpty || !draftPages.isEmpty || !emptyPages.isEmpty else {
+            do {
+                if FileManager.default.fileExists(atPath: file.path) {
+                    try FileManager.default.removeItem(at: file)
+                }
+            } catch {
+                print("    Failed to delete generation log: \(error)")
+            }
+            return
+        }
+        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("Generated files", generatedFiles) { $0 }
+        add("Drafts", draftPages) { $0 }
+        add("Empty pages", emptyPages) { "\($0.key) (from \($0.value))" }
+        let data = lines.joined(separator: "\n").data(using: .utf8)!
+        do {
+            try data.createFolderAndWrite(to: file)
+        } catch {
+            print("    Failed to save generation log: \(error)")
+        }
+    }
+}
+

Sources/Generator/Processing/ImageData.swift

@@ -0,0 +1,19 @@
+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

@@ -0,0 +1,348 @@
+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 numberOfImagesToCreate = 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)/\(numberOfImagesToCreate)")
+        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: sourcePath)
+    }
+
+    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 {
+            let output = try safeShell(command)
+            if output == "" {
+                return
+            }
+            markImageAsFailed(destination, error: "Failed to create AVIF image: \(output)")
+        } 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 {
+            let output = try safeShell(command)
+            if !output.contains("Error") {
+                return
+            }
+            markImageAsFailed(destination, error: "Failed to create WEBP image: \(output)")
+        } catch {
+            markImageAsFailed(destination, error: "Failed to create WEBP image: \(error)")
+        }
+    }
+
+    private func compress(at destination: String, quality: Int = 70) {
+        let command = "magick convert \(destination) -quality \(quality)% \(destination)"
+        do {
+            let output = try safeShell(command)
+            if output == "" {
+                return
+            }
+            markImageAsFailed(destination, error: "Failed to compress image: \(output)")
+        } catch {
+            markImageAsFailed(destination, error: "Failed to compress image: \(error)")
+        }
+    }
+
+    private func optimizeImages() {
+        let all = generatedImages
+            .filter { imageOptimSupportedFileExtensions.contains($0.lastComponentAfter(".")) }
+            .map { output.appendingPathComponent($0).path }
+        numberOfImagesToOptimize = all.count
+        for i in stride(from: 0, to: numberOfImagesToOptimize, by: imageOptimizationBatchSize) {
+            let endIndex = min(i+imageOptimizationBatchSize, numberOfImagesToOptimize)
+            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 {
+            let output = try safeShell(command)
+            if output.contains("Finished") {
+                return true
+            }
+
+            for image in batch {
+                markImageAsFailed(image, error: "Failed to optimize image: \(output)")
+            }
+            return true
+        } catch {
+            for image in batch {
+                markImageAsFailed(image, error: "Failed to optimize image: \(error)")
+            }
+            return false
+        }
+    }
+
+    // MARK: Output
+
+    private func didGenerateImage(count: Int = 1) {
+        numberOfGeneratedImages += count
+        print("      Generated images: \(numberOfGeneratedImages)/\(numberOfImagesToCreate)    \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) {
+        guard !missingImages.isEmpty || !unreadableImages.isEmpty || !failedImages.isEmpty || !unhandledImages.isEmpty || !imageWarnings.isEmpty || !generatedImages.isEmpty || !optimizedImages.isEmpty else {
+            do {
+                if FileManager.default.fileExists(atPath: file.path) {
+                    try FileManager.default.removeItem(at: file)
+                }
+            } catch {
+                print("    Failed to delete image log: \(error)")
+            }
+            return
+        }
+        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 image log: \(error)")
+        }
+    }
+}

Sources/Generator/Processing/MetadataInfoLogger.swift

@@ -0,0 +1,188 @@
+import Foundation
+
+final class MetadataInfoLogger {
+
+    private let input: URL
+
+    private var numberOfMetadataFiles = 0
+
+    private var unusedProperties: [(name: String, source: String)] = []
+
+    private var invalidProperties: [(name: String, source: String, reason: String)] = []
+
+    private var unknownProperties: [(name: String, source: String)] = []
+
+    private var missingProperties: [(name: String, source: String)] = []
+
+    private var unreadableMetadata: [(source: String, error: Error)] = []
+
+    private var warnings: [(source: String, message: String)] = []
+
+    private var errors: [(source: String, message: String)] = []
+
+    init(input: URL) {
+        self.input = input
+    }
+
+    /**
+     Adds an info message if a value is set for an unused property.
+     - Note: Unused properties do not cause an element to be skipped.
+     */
+    @discardableResult
+    func unused<T>(_ value: Optional<T>, _ name: String, source: String) -> T where T: DefaultValueProvider {
+        if let value {
+            unusedProperties.append((name, source))
+            return value
+        }
+        return T.defaultValue
+    }
+
+    /**
+     Cast a string value to another value, and using a default in case of errors.
+     - Note: Invalid string values do not cause an element to be skipped.
+     */
+    func cast<T>(_ value: String, _ name: String, source: String) -> T where T: DefaultValueProvider, T: StringProperty {
+        guard let result = T.init(value) else {
+            invalidProperties.append((name: name, source: source, reason: T.castFailureReason))
+            return T.defaultValue
+        }
+        return result
+    }
+
+    /**
+     Cast a string value to another value, and using a default in case of errors or missing values.
+     - Note: Invalid string values do not cause an element to be skipped.
+     */
+    func cast<T>(_ value: String?, _ name: String, source: String) -> T where T: DefaultValueProvider, T: StringProperty {
+        guard let value else {
+            return T.defaultValue
+        }
+        guard let result = T.init(value) else {
+            invalidProperties.append((name: name, source: source, reason: T.castFailureReason))
+            return T.defaultValue
+        }
+        return result
+    }
+
+    /**
+     Cast the string value of an unused property to another value, and using a default in case of errors.
+     - Note: Invalid string values do not cause an element to be skipped.
+     */
+    func castUnused<R>(_ value: String?, _ name: String, source: String) -> R where R: DefaultValueProvider, R: StringProperty {
+        unused(value.unwrapped { cast($0, name, source: source) }, name, source: source)
+    }
+
+    /**
+     Note an unknown property.
+     - Note: Unknown properties do not cause an element to be skipped.
+     */
+    func unknown(property: String, source: String) {
+        unknownProperties.append((name: property, source: source))
+    }
+
+    /**
+     Ensure that a property is set, and aborting metadata decoding.
+     - Note: Missing required properties cause an element to be skipped.
+     */
+    func required<T>(_ value: T?, name: String, source: String, _ valid: inout Bool) -> T where T: DefaultValueProvider {
+        guard let value = value else {
+            missingProperties.append((name, source))
+            valid = false
+            return T.defaultValue
+        }
+        return value
+    }
+
+    func warning(_ message: String, source: String) {
+        warnings.append((source, message))
+    }
+
+    func error(_ message: String, source: String) {
+        errors.append((source, message))
+    }
+
+    func failedToDecodeMetadata(source: String, error: Error) {
+        unreadableMetadata.append((source, error))
+    }
+
+    func readPotentialMetadata(atPath path: String, source: String) -> Data? {
+        let url = input.appendingPathComponent(path)
+        guard url.exists else {
+            return nil
+        }
+
+        numberOfMetadataFiles += 1
+        printMetadataScanUpdate()
+        do {
+            return try Data(contentsOf: url)
+        } catch {
+            unreadableMetadata.append((source, error))
+            return nil
+        }
+    }
+
+    // MARK: Printing
+
+    private func printMetadataScanUpdate() {
+        print("           Pages found: \(numberOfMetadataFiles)   \r", terminator: "")
+    }
+
+    func printMetadataScanOverview(languages: Int) {
+        var notes = [String]()
+        func addIfNotZero<S>(_ sequence: Array<S>, _ name: String) {
+            guard sequence.count > 0 else {
+                return
+            }
+            notes.append("\(sequence.count) \(name)")
+        }
+        addIfNotZero(warnings, "warnings")
+        addIfNotZero(errors, "errors")
+        addIfNotZero(unreadableMetadata, "unreadable files")
+        addIfNotZero(unusedProperties, "unused properties")
+        addIfNotZero(invalidProperties, "invalid properties")
+        addIfNotZero(unknownProperties, "unknown properties")
+        addIfNotZero(missingProperties, "missing properties")
+
+        print("           Pages found: \(numberOfMetadataFiles)        ")
+        print("             Languages: \(languages)")
+        if !notes.isEmpty {
+            print("                 Notes: " + notes.joined(separator: ", "))
+        }
+    }
+
+    func writeResults(to file: URL) {
+        guard !errors.isEmpty || !warnings.isEmpty || !unreadableMetadata.isEmpty || !unusedProperties.isEmpty || !invalidProperties.isEmpty || !unknownProperties.isEmpty || !missingProperties.isEmpty else {
+            do {
+                if FileManager.default.fileExists(atPath: file.path) {
+                    try FileManager.default.removeItem(at: file)
+                }
+            } catch {
+                print("    Failed to delete metadata log: \(error)")
+            }
+            return
+        }
+        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("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)!
+        do {
+            try data.createFolderAndWrite(to: file)
+        } catch {
+            print("    Failed to save metadata log: \(error)")
+        }
+    }
+}

Sources/Generator/Processing/RequiredHeaders.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+enum HeaderFile: String {
+    case codeHightlighting = "highlight.js"
+    case modelViewer = "model-viewer.js"
+
+    var asModule: Bool {
+        switch self {
+        case .codeHightlighting: return false
+        case .modelViewer: return true
+        }
+    }
+}
+
+typealias RequiredHeaders = Set<HeaderFile>

Sources/Generator/Processing/Shell.swift

@@ -0,0 +1,20 @@
+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

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

Sources/Generator/Templates/Elements/BoxTemplate.swift

@@ -1,13 +1,15 @@
 import Foundation
 
-struct PlaceholderTemplate: Template {
+struct BoxTemplate: Template {
 
     enum Key: String, CaseIterable {
         case title = "TITLE"
         case text = "TEXT"
     }
 
-    static let templateName = "empty.html"
+    static let templateName = "box.html"
 
     var raw: String
+
+    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Elements/OverviewSectionCleanTemplate.swift

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

Sources/Generator/Templates/Elements/OverviewSectionTemplate.swift

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

Sources/Generator/Templates/Elements/PageHeadTemplate.swift

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

Sources/Generator/Templates/Elements/PageImageTemplate.swift

@@ -0,0 +1,36 @@
+import Foundation
+
+enum PageImageTemplateKey: String, CaseIterable {
+    case altText = "ALT_TEXT"
+    case image = "IMAGE"
+    case imageExtension = "IMAGE_EXT"
+    case width = "WIDTH"
+    case height = "HEIGHT"
+    case leftText = "LEFT_TEXT"
+    case rightText = "RIGHT_TEXT"
+    case number = "NUMBER"
+}
+
+struct EnlargeableImageTemplate: Template {
+
+    typealias Key = PageImageTemplateKey
+
+    static let templateName = "image-enlargeable.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+
+}
+
+struct PageImageTemplate: Template {
+
+    typealias Key = PageImageTemplateKey
+
+    static let templateName = "image.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+
+}

Sources/Generator/Templates/Elements/PageLinkTemplate.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+struct PageLinkTemplate: Template {
+
+    enum Key: String, CaseIterable {
+        case altText = "ALT_TEXT"
+        case url = "URL"
+        case image = "IMAGE"
+        case title = "TITLE"
+        case path = "PATH"
+        case description = "DESCRIPTION"
+        case className = "CLASS"
+    }
+
+    static let templateName = "page-link.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+
+    func makePath(components: [String]) -> String {
+        components.joined(separator: " » ") //  » ")
+    }
+}

Sources/Generator/Templates/Elements/PageVideoTemplate.swift

@@ -23,6 +23,8 @@ 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/SlideshowImageTemplate.swift

@@ -0,0 +1,23 @@
+import Foundation
+
+struct SlideshowImageTemplate: Template {
+
+    enum Key: String, CaseIterable {
+        case altText = "ALT_TEXT"
+        case url = "URL"
+        case image = "IMAGE"
+        case title = "TITLE"
+        case subtitle = "SUBTITLE"
+        case number = "NUMBER"
+    }
+
+    static let templateName = "slideshow-image.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+
+    func makePath(components: [String]) -> String {
+        components.joined(separator: " » ") //  » ")
+    }
+}

Sources/Generator/Templates/Elements/SlideshowTemplate.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+struct SlideshowTemplate: Template {
+
+    enum Key: String, CaseIterable {
+        case title = "TITLE"
+        case content = "CONTENT"
+    }
+
+    static let templateName = "slideshow.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+}

Sources/Generator/Templates/Elements/SlideshowsTemplate.swift

@@ -0,0 +1,14 @@
+import Foundation
+
+struct SlideshowsTemplate: Template {
+
+    enum Key: String, CaseIterable {
+        case content = "CONTENT"
+    }
+
+    static let templateName = "slideshows.html"
+
+    let raw: String
+
+    let results: GenerationResultsHandler
+}

Sources/Generator/Templates/Elements/ThumbnailTemplate.swift

@@ -6,9 +6,9 @@ protocol ThumbnailTemplate {
 }
 
 enum ThumbnailKey: String, CaseIterable {
+    case altText = "ALT_TEXT"
     case url = "URL"
     case image = "IMAGE"
-    case image2x = "IMAGE_2X"
     case title = "TITLE"
     case corner = "CORNER"
 }
@@ -21,6 +21,8 @@ struct LargeThumbnailTemplate: Template, ThumbnailTemplate {
 
     let raw: String
 
+    let results: GenerationResultsHandler
+
     func makeCorner(text: String) -> String {
         "<span class=\"corner\"><span>\(text)</span></span>"
     }
@@ -37,6 +39,8 @@ struct SquareThumbnailTemplate: Template, ThumbnailTemplate {
     static let templateName = "thumbnail-square.html"
 
     let raw: String
+
+    let results: GenerationResultsHandler
 }
 
 struct SmallThumbnailTemplate: Template, ThumbnailTemplate {
@@ -46,5 +50,7 @@ struct SmallThumbnailTemplate: Template, ThumbnailTemplate {
     static let templateName = "thumbnail-small.html"
 
     let raw: String
+
+    let results: GenerationResultsHandler
 }
 

Sources/Generator/Templates/Elements/TopBarTemplate.swift

@@ -12,4 +12,6 @@ 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) throws {
+    init(factory: TemplateFactory, language: String, site: Element, results: GenerationResultsHandler) {
         self.author = site.author
         self.factory = factory
 
@@ -51,7 +51,7 @@ struct LocalizedSiteTemplate {
         self.month = df2
 
         let df3 = DateFormatter()
-        df3.dateFormat = "dd"
+        df3.dateFormat = "d"
         df3.locale = Locale(identifier: language)
         self.day = df3
 
@@ -61,23 +61,19 @@ struct LocalizedSiteTemplate {
                 url: $0.path + Element.htmlPagePathAddition(for: language))
         }
 
-        self.topBar = try .init(
+        self.topBar = .init(
             factory: factory,
             language: language,
             sections: sections,
             topBarWebsiteTitle: site.topBarTitle)
-        self.pageHead = PageHeadGenerator(
-            factory: factory)
-        self.overviewSection = OverviewSectionGenerator(
-            factory: factory)
+        self.pageHead = PageHeadGenerator(factory: factory, results: results)
+        self.overviewSection = OverviewSectionGenerator(factory: factory, siteRoot: site, results: results)
     }
 
     // MARK: Content
 
     func makePlaceholder(metadata: Element.LocalizedMetadata) -> String {
-        factory.placeholder.generate([
-            .title: metadata.placeholderTitle,
-            .text: metadata.placeholderText])
+        factory.makePlaceholder(title: metadata.placeholderTitle, text: metadata.placeholderText)
     }
 
     func makeBackLink(text: String, language: String) -> String {

Sources/Generator/Templates/Filled/PrefilledTopBarTemplate.swift

@@ -10,17 +10,17 @@ struct PrefilledTopBarTemplate {
 
     private let factory: TemplateFactory
 
-    init(factory: TemplateFactory, language: String, sections: [SectionInfo], topBarWebsiteTitle: String) throws {
+    init(factory: TemplateFactory, language: String, sections: [SectionInfo], topBarWebsiteTitle: String) {
         self.factory = factory
         self.language = language
         self.sections = sections
         self.topBarWebsiteTitle = topBarWebsiteTitle
     }
 
-    func generate(sectionUrl: String?, languageButton: String?) -> String {
+    func generate(sectionUrl: String?, languageButton: String?, page: Element) -> String {
         var content = [TopBarTemplate.Key : String]()
         content[.title] = topBarWebsiteTitle
-        content[.titleLink] = factory.html.topBarWebsiteTitle(language: language)
+        content[.titleLink] = factory.html.topBarWebsiteTitle(language: language, from: page)
         content[.elements] = elements(activeSectionUrl: sectionUrl)
         content[.languageButton] = languageButton.unwrapped(factory.html.topBarLanguageButton) ?? ""
         return factory.topBar.generate(content)

Sources/Generator/Templates/Pages/HeaderTemplate.swift

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

Sources/Generator/Templates/Pages/PageTemplate.swift

@@ -3,6 +3,7 @@ import Foundation
 struct PageTemplate: Template {
 
     enum Key: String, CaseIterable {
+        case language = "LANG"
         case head = "HEAD"
         case topBar = "TOP_BAR"
         case contentClass = "CONTENT_CLASS"
@@ -18,4 +19,6 @@ struct PageTemplate: Template {
     static let templateName = "page.html"
 
     let raw: String
+
+    let results: GenerationResultsHandler
 }

Sources/Generator/Templates/Template.swift

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

Sources/Generator/Templates/TemplateFactory.swift

@@ -0,0 +1,106 @@
+import Foundation
+
+final class TemplateFactory {
+
+    let templateFolder: URL
+
+    // MARK: Site Elements
+
+    let backNavigation: BackNavigationTemplate
+
+    let pageHead: PageHeadTemplate
+
+    let topBar: TopBarTemplate
+
+    let overviewSection: OverviewSectionTemplate
+
+    let overviewSectionClean: OverviewSectionCleanTemplate
+
+    let pageLink: PageLinkTemplate
+
+    let box: BoxTemplate
+
+    // MARK: Thumbnails
+
+    let largeThumbnail: LargeThumbnailTemplate
+
+    let squareThumbnail: SquareThumbnailTemplate
+
+    let smallThumbnail: SmallThumbnailTemplate
+
+    func thumbnail(style: ThumbnailStyle) -> ThumbnailTemplate {
+        switch style {
+        case .large:
+            return largeThumbnail
+        case .square:
+            return squareThumbnail
+        case .small:
+            return smallThumbnail
+        }
+    }
+
+    // MARK: Headers
+
+    let leftHeader: LeftHeaderTemplate
+
+    let centeredHeader: CenteredHeaderTemplate
+
+    // MARK: Pages
+
+    let page: PageTemplate
+
+    let image: PageImageTemplate
+
+    let largeImage: EnlargeableImageTemplate
+
+    let video: PageVideoTemplate
+
+    // MARK: Slideshow
+
+    let slideshows: SlideshowsTemplate
+
+    let slideshow: SlideshowTemplate
+
+    let slideshowImage: SlideshowImageTemplate
+
+    // MARK: HTML
+
+    let html: HTMLElementsGenerator
+
+    // MARK: Init
+
+    init(templateFolder: URL, results: GenerationResultsHandler) throws {
+        self.templateFolder = templateFolder
+        func create<T>() throws -> T where T: Template {
+            try .init(in: templateFolder, results: results)
+        }
+        self.backNavigation = try create()
+        self.pageHead = try create()
+        self.topBar = try create()
+        self.overviewSection = try create()
+        self.overviewSectionClean = try create()
+        self.box = try create()
+        self.pageLink = try create()
+        self.largeThumbnail = try create()
+        self.squareThumbnail = try create()
+        self.smallThumbnail = try create()
+        self.leftHeader = try create()
+        self.centeredHeader = try create()
+        self.page = try create()
+        self.image = try create()
+        self.largeImage = try create()
+        self.video = try create()
+        self.slideshow = try create()
+        self.slideshows = try create()
+        self.slideshowImage = try create()
+        self.html = .init()
+    }
+
+    // MARK: Convenience methods
+
+    func makePlaceholder(title: String, text: String) -> String {
+        box.generate([
+            .title: title,
+            .text: text])
+    }
+}

Sources/Generator/run.swift

@@ -0,0 +1,187 @@
+import Foundation
+import ArgumentParser
+
+
+@main
+struct CHGenerator: ParsableCommand {
+
+    @Argument(help: "The path to the generator configuration file")
+    var configPath: String
+
+    mutating func run() throws {
+        try generate(configPath: configPath)
+    }
+}
+
+private func loadConfiguration(at configPath: String) -> Configuration? {
+    print("--- CONFIGURATION ----------------------------------")
+    print("                                                    ")
+    print("    Configuration file: \(configPath)")
+    let configUrl = URL(fileURLWithPath: configPath)
+    guard configUrl.exists else {
+        print("                 Error: Configuration file not found")
+        return nil
+    }
+    var config: Configuration
+    do {
+        let data = try Data(contentsOf: configUrl)
+        config = try JSONDecoder().decode(from: data)
+        config.adjustPathsRelative(to: configUrl.deletingLastPathComponent())
+    } catch {
+        print("   Configuration error: \(error)")
+        return nil
+    }
+    config.printOverview()
+    print("                                                    ")
+    return config
+}
+
+private func loadSiteData(in folder: URL, runFolder: URL) throws -> (root: Element, pageMap: PageMap)? {
+    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 pageMap = root.languages.map { language in
+        (language: language.language,
+         pages: root.getExternalPageMap(language: language.language, log: log))
+    }
+    log.printMetadataScanOverview(languages: root.languages.count)
+    return (root, pageMap)
+}
+
+private func generatePages(from root: Element, configuration: Configuration, fileUpdates: FileUpdateChecker, pageMap: PageMap, runFolder: URL) -> (ImageData, FileData)? {
+    print("--- GENERATION -------------------------------------")
+    print("                                                    ")
+
+    let pageCount = pageMap.reduce(0) { $0 + $1.pages.count }
+    let results = GenerationResultsHandler(
+        in: configuration.contentDirectory,
+        to: configuration.outputDirectory,
+        configuration: configuration,
+        fileUpdates: fileUpdates,
+        pageMap: pageMap,
+        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()
+    let file = runFolder.appendingPathComponent("files.txt")
+    generator.writeResults(to: file)
+}
+
+private func finish(start: Date, complete: Bool) {
+    print("--- SUMMARY ----------------------------------------")
+    print("                                                    ")
+    let duration = Int(-start.timeIntervalSinceNow.rounded())
+    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("              Complete: \(complete ? "Yes" : "No")")
+    print("                                                    ")
+    print("----------------------------------------------------")
+}
+
+private func generate(configPath: String) throws {
+    let start = Date()
+    var complete = false
+
+    defer {
+        // 6. Print summary
+        finish(start: start, complete: complete)
+    }
+
+    print("                                                    ")
+
+    guard checkDependencies() else {
+        return
+    }
+
+    // 1. Load configuration
+    guard let configuration = loadConfiguration(at: configPath) else {
+        return
+    }
+
+    let runFolder = configuration.contentDirectory.appendingPathComponent("run")
+
+    // 2. Scan site elements
+    guard let (siteRoot, pageMap) = try loadSiteData(in: configuration.contentDirectory, runFolder: runFolder) else {
+        return
+    }
+
+    let fileUpdates = FileUpdateChecker(input: configuration.contentDirectory)
+    switch fileUpdates.loadPreviousRun(from: runFolder)  {
+    case .notLoaded:
+        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
+
+    guard let (images, files) = generatePages(from: siteRoot, configuration: configuration, fileUpdates: fileUpdates, pageMap: pageMap, runFolder: runFolder) else {
+        return
+    }
+
+    // 4. Generate images
+    generateImages(images, configuration: configuration, runFolder: runFolder, fileUpdates: fileUpdates)
+
+    // 5. Copy/minify files
+    copyFiles(files: files, configuration: configuration, runFolder: runFolder)
+
+    complete = true
+}

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@@ -1,573 +0,0 @@
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WebsiteGenerator.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "self:">
-   </FileRef>
-</Workspace>

WebsiteGenerator.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -1,8 +0,0 @@
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-<plist version="1.0">
-<dict>
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-	<true/>
-</dict>
-</plist>

WebsiteGenerator.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -1,23 +0,0 @@
-{
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-      "identity" : "ink",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/johnsundell/ink.git",
-      "state" : {
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-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/JohnSundell/Splash",
-      "state" : {
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-        "version" : "0.16.0"
-      }
-    }
-  ],
-  "version" : 2
-}

WebsiteGenerator.xcodeproj/xcshareddata/xcschemes/WebsiteGenerator.xcscheme

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-               BlueprintIdentifier = "E22E875E289D84C300E51191"
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-      </BuildActionEntries>
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-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES">
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-   <ArchiveAction
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WebsiteGenerator.xcodeproj/xcuserdata/ch.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -1,6 +0,0 @@
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-   type = "1"
-   version = "2.0">
-</Bucket>

WebsiteGenerator.xcodeproj/xcuserdata/ch.xcuserdatad/xcschemes/xcschememanagement.plist

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-<plist version="1.0">
-<dict>
-	<key>SchemeUserState</key>
-	<dict>
-		<key>WebsiteGenerator.xcscheme_^#shared#^_</key>
-		<dict>
-			<key>orderHint</key>
-			<integer>0</integer>
-		</dict>
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-	<key>SuppressBuildableAutocreation</key>
-	<dict>
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-		<dict>
-			<key>primary</key>
-			<true/>
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-	</dict>
-</dict>
-</plist>

WebsiteGenerator/Content/Element.swift

@@ -1,519 +0,0 @@
-import Foundation
-
-struct Element {
-
-    static let overviewItemCountDefault = 6
-
-    /**
-     The default unique id for the root element
-     */
-    static let defaultRootId = "root"
-
-    /**
-     The unique id of the element.
-
-     The id is used for short-hand links to pages, in the form of `![page](page_id)`
-     for thumbnail previews or `[text](page:page_id)` for simple links.
-     - Note: The default id for the root element is specified by ``defaultRootId``
-
-     The id can be manually specified using ``GenericMetadata.id``,
-     otherwise it is set to the name of the element folder.
-     */
-    let id: String
-
-    /**
-     The author of the content.
-
-     If no author is set, then the author from the parent element is used.
-     */
-    let author: String
-
-    /**
-     The title used in the top bar of the website, next to the logo.
-
-     This title can be HTML content, and only the root level value is used.
-     */
-    let topBarTitle: String
-
-    /**
-     The (start) date of the element.
-
-     The date is printed on content pages and may also used for sorting elements,
-     depending on the `useManualSorting` property of the parent.
-     */
-    let date: Date?
-
-    /**
-     The end date of the element.
-
-     This property can be used to specify a date range for a content page.
-     */
-    let endDate: Date?
-
-    /**
-     The deployment state of the page.
-
-     - Note: This property defaults to ``PageState.standard`
-     */
-    let state: PageState
-
-    /**
-     The sort index of the page for manual sorting.
-
-     - Note: This property is only used (and must be set) if `useManualSorting` option of the parent is set.
-     */
-    let sortIndex: Int?
-
-    /**
-     All files which may occur in content but is stored externally.
-
-     Missing files which would otherwise produce a warning are ignored when included here.
-     - Note: This property defaults to an empty set.
-     */
-    let externalFiles: Set<String>
-
-    /**
-     Specifies additional files which should be copied to the destination when generating the content.
-     - Note: This property defaults to an empty set.
-     */
-    let requiredFiles: Set<String>
-
-    /**
-     The style of thumbnail to use when generating overviews.
-
-     - Note: This property is only relevant for sections.
-     - Note: This property is inherited from the parent if not specified.
-     */
-    let thumbnailStyle: ThumbnailStyle
-
-    /**
-     Sort the child elements by their `sortIndex` property when generating overviews, instead of using the `date`.
-
-     - Note: This property is only relevant for sections.
-     - Note: This property defaults to `false`
-     */
-    let useManualSorting: Bool
-
-    /**
-     The number of items to show when generating overviews of this element.
-     - Note: This property is only relevant for sections.
-     - Note: This property is inherited from the parent if not specified.
-     */
-    let overviewItemCount: Int
-
-    /**
-     Indicate that no header should be generated automatically.
-
-     This option assumes that custom header code is present in the page source files
-     - Note: If not specified, this property defaults to `false`.
-     */
-    let useCustomHeader: Bool
-
-    /**
-     The localized metadata for each language.
-     */
-    let languages: [LocalizedMetadata]
-
-    /**
-     All elements contained within the element.
-
-     If the element is a section, then this property contains the pages or subsections within.
-     */
-    var elements: [Element] = []
-
-    /**
-     The url of the element's folder in the source hierarchy.
-     - Note: This property is essentially the root folder of the site, appended with the value of the ``path`` property.
-     */
-    let inputFolder: URL
-
-    /**
-     The path to the element's folder in the source hierarchy (without a leading slash).
-     */
-    let path: String
-
-    /**
-     Create the root element of a site.
-
-     The root element will recursively move into subfolders and build the site content
-     by looking for metadata files in each subfolder.
-     - Parameter folder: The root folder of the site content.
-     - Note: Uses global objects.
-     */
-    init?(atRoot folder: URL) throws {
-        self.inputFolder = folder
-        self.path = ""
-
-        let source = GenericMetadata.metadataFileName
-        guard let metadata = GenericMetadata(source: source) else {
-            return nil
-        }
-
-        self.id = metadata.customId ?? Element.defaultRootId
-        self.author = log.required(metadata.author, name: "author", source: source) ?? "author"
-        self.topBarTitle = log
-            .required(metadata.topBarTitle, name: "topBarTitle", source: source) ?? "My Website"
-        self.date = log.unused(metadata.date, "date", source: source)
-        self.endDate = log.unused(metadata.endDate, "endDate", source: source)
-        self.state = log.state(metadata.state, source: source)
-        self.sortIndex = log.unused(metadata.sortIndex, "sortIndex", source: source)
-        self.externalFiles = metadata.externalFiles ?? []
-        self.requiredFiles = metadata.requiredFiles ?? [] // Paths are already relative to root
-        self.thumbnailStyle = log.unused(metadata.thumbnailStyle, "thumbnailStyle", source: source) ?? .large
-        self.useManualSorting = log.unused(metadata.useManualSorting, "useManualSorting", source: source) ?? true
-        self.overviewItemCount = metadata.overviewItemCount ?? Element.overviewItemCountDefault
-        self.useCustomHeader = metadata.useCustomHeader ?? false
-        self.languages = log.required(metadata.languages, name: "languages", source: source)?
-            .compactMap { language in
-                    .init(atRoot: folder, data: language)
-            } ?? []
-
-        // All properties initialized
-
-        files.add(page: path, id: id)
-        try self.readElements(in: folder, source: nil)
-    }
-
-    mutating func readElements(in folder: URL, source: String?) throws {
-        let subFolders: [URL]
-        do {
-            subFolders = try FileManager.default
-                .contentsOfDirectory(at: folder, includingPropertiesForKeys: [.isDirectoryKey])
-                .filter { $0.isDirectory }
-        } catch {
-            log.add(error: "Failed to read subfolders", source: source ?? "root", error: error)
-            return
-        }
-        self.elements = try subFolders.compactMap { subFolder in
-            let s = (source.unwrapped { $0 + "/" } ?? "") + subFolder.lastPathComponent
-            return try Element(parent: self, folder: subFolder, path: s)
-        }
-    }
-
-    init?(parent: Element, folder: URL, path: String) throws {
-        self.inputFolder = folder
-        self.path = path
-
-        let source = path + "/" + GenericMetadata.metadataFileName
-        guard let metadata = GenericMetadata(source: source) else {
-            return nil
-        }
-
-        self.id = metadata.customId ?? folder.lastPathComponent
-        self.author = metadata.author ?? parent.author
-        self.topBarTitle = log
-            .unused(metadata.topBarTitle, "topBarTitle", source: source) ?? parent.topBarTitle
-        let date = log.date(from: metadata.date, property: "date", source: source).ifNil {
-            if !parent.useManualSorting {
-                log.add(error: "No 'date', but parent defines 'useManualSorting' = false", source: source)
-            }
-        }
-        self.date = date
-        self.endDate = log.date(from: metadata.endDate, property: "endDate", source: source).ifNotNil {
-            if date == nil {
-                log.add(warning: "Set 'endDate', but no 'date'", source: source)
-            }
-        }
-        self.state = log.state(metadata.state, source: source)
-        self.sortIndex = metadata.sortIndex.ifNil {
-            if parent.useManualSorting {
-                log.add(error: "No 'sortIndex', but parent defines 'useManualSorting' = true", source: source)
-            }
-        }
-        // 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.thumbnailStyle = log.thumbnailStyle(metadata.thumbnailStyle, source: source)
-        self.useManualSorting = metadata.useManualSorting ?? false
-        self.overviewItemCount = metadata.overviewItemCount ?? parent.overviewItemCount
-        self.useCustomHeader = metadata.useCustomHeader ?? false
-        self.languages = parent.languages.compactMap { parentData in
-            guard let data = metadata.languages?.first(where: { $0.language == parentData.language }) else {
-                log.add(info: "Language '\(parentData.language)' not found", source: source)
-                return nil
-            }
-            return .init(folder: folder, data: data, source: source, parent: parentData)
-        }
-        // Check that each 'language' tag is present, and that all languages appear in the parent
-        log.required(metadata.languages, name: "languages", source: source)?
-            .compactMap { log.required($0.language, name: "language", source: source) }
-            .filter { language in
-                !parent.languages.contains { $0.language == language }
-            }
-            .forEach {
-                log.add(warning: "Language '\($0)' not found in parent, so not generated", source: source)
-            }
-
-        // All properties initialized
-
-        files.add(page: path, id: id)
-        try self.readElements(in: folder, source: path)
-    }
-}
-
-// MARK: Paths
-
-extension Element {
-
-    /**
-     The localized html file name for a language, including a leading slash.
-     */
-    static func htmlPagePathAddition(for language: String) -> String {
-        "/" + htmlPageName(for: language)
-    }
-
-    /**
-     The localized html file name for a language, without the leading slash.
-     */
-    static func htmlPageName(for language: String) -> String {
-        "\(language).html"
-    }
-
-    var containsElements: Bool {
-        !elements.isEmpty
-    }
-
-    var hasNestingElements: Bool {
-        elements.contains { $0.containsElements }
-    }
-
-    func itemsForOverview(_ count: Int? = nil) -> [Element] {
-        if let shownItemCount = count {
-            return Array(sortedItems.prefix(shownItemCount))
-        } else {
-            return sortedItems
-        }
-    }
-
-    var sortedItems: [Element] {
-        if useManualSorting {
-            return shownItems.sorted { $0.sortIndex! < $1.sortIndex! }
-        }
-        return shownItems.sorted { $0.date! > $1.date! }
-    }
-
-    private var shownItems: [Element] {
-        elements.filter { $0.state.isShownInOverview }
-    }
-
-    /**
-     The url of the top-level section of the element.
-     */
-    func sectionUrl(for language: String) -> String {
-        path.components(separatedBy: "/").first! + Element.htmlPagePathAddition(for: language)
-    }
-
-    /**
-     Create a relative link to another page in the tree.
-     - Parameter pageUrl: The full page url of the target page, including localization
-     - Returns: The relative url from a localized page of the element to the target page.
-     */
-    func relativePathToOtherSiteElement(pageUrl: String) -> String {
-        // Note: The element `path` is missing the last component
-        // i.e. travel/alps instead of travel/alps/en.html
-        let ownParts = path.components(separatedBy: "/")
-        let pageParts = pageUrl.components(separatedBy: "/")
-
-        // Find the common elements of the path, which can be discarded
-        var index = 0
-        while pageParts[index] == ownParts[index] {
-            index += 1
-        }
-        // The relative path needs to go down to the first common folder,
-        // before going up to the target page
-        let allParts = [String](repeating: "..", count: ownParts.count-index)
-                        + pageParts.dropFirst(index)
-        return allParts.joined(separator: "/")
-    }
-    
-    /**
-     Create an absolute path (relative to the root directory) for a file contained in the elements folder.
-
-     This function is used to copy required input files and to generate images
-     */
-    func pathRelativeToRootForContainedInputFile(_ filePath: String) -> String {
-        Element.relativeToRoot(filePath: filePath, folder: path)
-    }
-
-    /**
-     Create an absolute path (relative to the root directory) for a file contained in the elements folder.
-
-     This function is used to copy required input files and to generate images
-     */
-    func nonAbsolutePathRelativeToRootForContainedInputFile(_ filePath: String) -> String? {
-        Element.containedFileRelativeToRoot(filePath: filePath, folder: path)
-    }
-
-    static func relativeToRoot(filePath: String, folder path: String) -> String {
-        containedFileRelativeToRoot(filePath: filePath, folder: path) ?? filePath
-    }
-
-    static func containedFileRelativeToRoot(filePath: String, folder path: String) -> String? {
-        if filePath.hasPrefix("/") || filePath.hasPrefix("http") || filePath.hasPrefix("mailto:") {
-            return nil
-        }
-        return "\(path)/\(filePath)"
-    }
-
-    static func rootPaths(for input: Set<String>?, path: String) -> Set<String> {
-        input.unwrapped { Set($0.map { relativeToRoot(filePath: $0, folder: path) }) } ?? []
-    }
-
-    func relativePathToFileWithPath(_ filePath: String) -> String {
-        guard path != "" else {
-            return filePath
-        }
-        guard filePath.hasPrefix(path) else {
-            return filePath
-        }
-        return filePath.replacingOccurrences(of: path + "/", with: "")
-    }
-}
-
-// MARK: Accessing localizations
-
-extension Element {
-
-    /**
-     Get the full path of the thumbnail image for the language (relative to the root folder).
-     */
-    func thumbnailFilePath(for language: String) -> String {
-        guard let thumbnailFile = Element.findThumbnail(for: language, in: inputFolder) else {
-            log.add(error: "Missing thumbnail", source: path)
-            return Element.defaultThumbnailName
-        }
-        return pathRelativeToRootForContainedInputFile(thumbnailFile)
-    }
-
-    func fullPageUrl(for language: String) -> String {
-        localized(for: language).externalUrl ?? localizedPath(for: language)
-    }
-
-    func localized(for language: String) -> LocalizedMetadata {
-        languages.first { $0.language == language }!
-    }
-
-    func title(for language: String) -> String {
-        localized(for: language).title
-    }
-
-    /**
-     Get the back link text for the element.
-
-     This text is the one printed for pages of the element, which uses the back text specified by the parent.
-     */
-    func backLinkText(for language: String) -> String {
-        localized(for: language).parentBackLinkText
-    }
-
-    /**
-     The optional text to display in a thumbnail corner.
-     - Note: This text is only displayed for large thumbnails.
-     */
-    func cornerText(for language: String) -> String? {
-        localized(for: language).cornerText
-    }
-
-    /**
-     Returns the full path (relative to the site root for a page of the element in the given language.
-     */
-    func localizedPath(for language: String) -> String {
-        guard path != "" else {
-            return Element.htmlPageName(for: language)
-        }
-        return path + Element.htmlPagePathAddition(for: language)
-    }
-
-    /**
-     Get the next language to switch to with the language button.
-     */
-    func nextLanguage(for language: String) -> String? {
-        let langs = languages.map { $0.language }
-        guard let index = langs.firstIndex(of: language) else {
-            return nil
-        }
-        for i in 1..<langs.count {
-            let next = langs[(index + i) % langs.count]
-            guard hasContent(for: next) else {
-                continue
-            }
-            guard next != language else {
-                return nil
-            }
-
-            return next
-        }
-        return nil
-    }
-
-    func linkPreviewImage(for language: String) -> String? {
-        localized(for: language).linkPreviewImage
-    }
-}
-
-// MARK: Page content
-
-extension Element {
-
-    var isExternalPage: Bool {
-        languages.contains { $0.externalUrl != nil }
-    }
-
-    /**
-     Get the url of the content markdown file for a language.
-
-     To check if the file also exists, use `existingContentUrl(for:)`
-     */
-    private func contentUrl(for language: String) -> URL {
-        inputFolder.appendingPathComponent("\(language).md")
-    }
-
-    /**
-     Get the url of existing markdown content for a language.
-     */
-    private func existingContentUrl(for language: String) -> URL? {
-        let url = contentUrl(for: language)
-        guard url.exists else {
-            return nil
-        }
-        return url
-    }
-
-    private func hasContent(for language: String) -> Bool {
-        if !elements.isEmpty {
-            return true
-        }
-        return existingContentUrl(for: language) != nil
-    }
-}
-
-// MARK: Header and Footer
-
-extension Element {
-
-    private var additionalHeadContentPath: String {
-        path + "/head.html"
-    }
-
-    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
-
-extension Element {
-
-    func printTree(indentation: String = "") {
-        print(indentation + "/" + path)
-        elements.forEach { $0.printTree(indentation: indentation + "  ") }
-    }
-}

WebsiteGenerator/Extensions/URL+Extensions.swift

@@ -1,38 +0,0 @@
-import Foundation
-
-extension URL {
-
-    func ensureParentFolderExistence() throws {
-        try deletingLastPathComponent().ensureFolderExistence()
-    }
-
-    func ensureFolderExistence() throws {
-        guard !exists else {
-            return
-        }
-        try FileManager.default.createDirectory(at: self, withIntermediateDirectories: true)
-    }
-
-    var isDirectory: Bool {
-        (try? resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory == true
-    }
-
-    var exists: Bool {
-        FileManager.default.fileExists(atPath: path)
-    }
-
-    /**
-     Delete the file at the url.
-     */
-    func delete() throws {
-        try FileManager.default.removeItem(at: self)
-    }
-
-    func copy(to url: URL) throws {
-        if url.exists {
-            try url.delete()
-        }
-        try url.ensureParentFolderExistence()
-        try FileManager.default.copyItem(at: self, to: url)
-    }
-}

WebsiteGenerator/Files/Configuration.swift

@@ -1,6 +0,0 @@
-import Foundation
-
-struct Configuration {
-
-    let pageImageWidth: Int
-}

WebsiteGenerator/Files/FileSystem.swift

@@ -1,481 +0,0 @@
-import Foundation
-import CryptoKit
-import AppKit
-
-typealias SourceFile = (data: Data, didChange: Bool)
-typealias SourceTextFile = (content: String, didChange: Bool)
-
-final class FileSystem {
-
-    private static let hashesFileName = "hashes.json"
-
-    private let input: URL
-
-    private let output: URL
-
-    private let source = "FileChangeMonitor"
-
-    private var hashesFile: URL {
-        input.appendingPathComponent(FileSystem.hashesFileName)
-    }
-
-    /**
-     The hashes of all accessed files from the previous run
-
-     The key is the relative path to the file from the source
-     */
-    private var previousFiles: [String : Data] = [:]
-
-    /**
-     The paths of all files which were accessed, with their new hashes
-
-     This list is used to check if a file was modified, and to write all accessed files back to disk
-     */
-    private var accessedFiles: [String : Data] = [:]
-
-    /**
-     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 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] = [:]
-
-    init(in input: URL, to output: URL) {
-        self.input = input
-        self.output = output
-
-        guard exists(hashesFile) else {
-            log.add(info: "No file hashes loaded, regarding all content as new", source: source)
-            return
-        }
-        let data: Data
-        do {
-            data = try Data(contentsOf: hashesFile)
-        } catch {
-            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 {
-            log.add(
-                warning: "File hashes could not be decoded, regarding all content as new",
-                source: source,
-                error: error)
-            return
-        }
-    }
-
-    func urlInOutputFolder(_ path: String) -> URL {
-        output.appendingPathComponent(path)
-    }
-
-    func urlInContentFolder(_ path: String) -> URL {
-        input.appendingPathComponent(path)
-    }
-
-    /**
-     Get the current hash of file data at a path.
-
-     If the hash has been computed previously during the current run, then this function directly returns it.
-     */
-    private func hash(_ data: Data, at path: String) -> Data {
-        accessedFiles[path] ?? SHA256.hash(data: data).data
-    }
-
-    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 dataOfOptionalFile(atPath path: String, source: String) -> Data? {
-        let url = input.appendingPathComponent(path)
-        guard exists(url) else {
-            return nil
-        }
-
-        do {
-            return try Data(contentsOf: url)
-        } catch {
-            log.failedToOpen(path, requiredBy: source, error: error)
-            return nil
-        }
-    }
-
-    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
-        }
-    }
-
-    private func getData(atPath path: String) -> SourceFile? {
-        let url = input.appendingPathComponent(path)
-        guard exists(url) else {
-            return nil
-        }
-        let data: Data
-        do {
-            data = try Data(contentsOf: url)
-        } catch {
-            log.add(error: "Failed to read data at \(path)", source: source, error: error)
-            return nil
-        }
-        let newHash = hash(data, at: path)
-        defer {
-            accessedFiles[path] = newHash
-        }
-        guard let oldHash = previousFiles[path] else {
-            return (data: data, didChange: true)
-        }
-        return (data: data, didChange: oldHash != newHash)
-    }
-
-    func writeHashes() {
-        do {
-            let encoder = JSONEncoder()
-            encoder.outputFormatting = .prettyPrinted
-            let data = try encoder.encode(accessedFiles)
-            try data.write(to: hashesFile)
-        } catch {
-            log.add(warning: "Failed to save file hashes", source: source, error: error)
-        }
-    }
-
-    // MARK: Images
-
-    private func loadImage(atPath path: String) -> (image: NSImage, changed: Bool)? {
-        guard let (data, changed) = 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, changed)
-    }
-
-    @discardableResult
-    func requireImage(source: String, destination: String, width: Int, desiredHeight: Int? = nil)  -> NSSize {
-        let height = desiredHeight.unwrapped(CGFloat.init)
-        let sourceUrl = input.appendingPathComponent(source)
-        let image = ImageOutput(source: source, width: width, desiredHeight: desiredHeight)
-
-        let standardSize = NSSize(width: CGFloat(width), height: height ?? CGFloat(width) / 16 * 9)
-        guard sourceUrl.exists else {
-            log.add(error: "Missing file with size (\(width),\(desiredHeight ?? -1))",
-                    source: source)
-            return standardSize
-        }
-        guard let imageSize = loadImage(atPath: image.source)?.image.size else {
-            log.add(error: "Unreadable image with size (\(width),\(desiredHeight ?? -1))",
-                    source: source)
-            return standardSize
-        }
-        let scaledSize = imageSize.scaledDown(to: CGFloat(width))
-
-        guard let existing = imageTasks[destination] else {
-            imageTasks[destination] = image
-            return scaledSize
-        }
-        guard existing.source == source else {
-            log.add(error: "Multiple sources (\(existing.source),\(source))",
-                    source: destination)
-            return scaledSize
-        }
-        guard existing.hasSimilarRatio(as: image) else {
-            log.add(error: "Multiple ratios (\(existing.ratio!),\(image.ratio!))",
-                    source: destination)
-            return scaledSize
-        }
-        if image.width > existing.width {
-            log.add(info: "Increasing size from \(existing.width) to \(width)",
-                    source: destination)
-            imageTasks[destination] = image
-        }
-        return scaledSize
-    }
-
-    func createImages() {
-        for (destination, image) in imageTasks.sorted(by: { $0.key < $1.key }) {
-            createImageIfNeeded(image, for: destination)
-        }
-    }
-
-    private func createImageIfNeeded(_ image: ImageOutput, for destination: String) {
-        guard let (sourceImageData, sourceImageChanged) = getData(atPath: image.source) else {
-            log.add(error: "Failed to open file", source: image.source)
-            return
-        }
-
-        let destinationUrl = output.appendingPathComponent(destination)
-
-        // Check if image needs to be updated
-        guard !destinationUrl.exists || sourceImageChanged else {
-            return
-        }
-
-        // Ensure that image file is supported
-        let ext = destinationUrl.pathExtension.lowercased()
-        guard ImageType(fileExtension: ext) != nil else {
-            // TODO: This should never be reached, since extensions are checked before
-            log.add(info: "Copying image", source: image.source)
-            do {
-                let sourceUrl = input.appendingPathComponent(image.source)
-                try destinationUrl.ensureParentFolderExistence()
-                try sourceUrl.copy(to: destinationUrl)
-            } catch {
-                log.add(error: "Failed to copy image", source: destination)
-            }
-            return
-        }
-        guard let sourceImage = NSImage(data: sourceImageData) else {
-            log.add(error: "Failed to read file", source: image.source)
-            return
-        }
-
-        let desiredWidth = CGFloat(image.width)
-        let desiredHeight = image.desiredHeight.unwrapped(CGFloat.init)
-
-        let destinationSize = sourceImage.size.scaledDown(to: desiredWidth)
-        let scaledImage = sourceImage.scaledDown(to: destinationSize)
-        let scaledSize = scaledImage.size
-
-        if abs(scaledImage.size.width - desiredWidth) > 2 {
-            log.add(warning: "Desired width \(desiredWidth), got \(scaledSize.width)", source: destination)
-        }
-        if abs(destinationSize.height - scaledImage.size.height) > 2 {
-            log.add(warning: "Desired height \(destinationSize.height), got \(scaledSize.height)", source: destination)
-        }
-        if let desiredHeight = desiredHeight {
-            let desiredRatio = desiredHeight / desiredWidth
-            let adjustedDesiredHeight = scaledSize.width * desiredRatio
-            if abs(adjustedDesiredHeight - scaledSize.height) > 5 {
-                log.add(warning: "Desired height \(desiredHeight), got \(scaledSize.height)", source: destination)
-                return
-            }
-        }
-        if scaledSize.width > desiredWidth {
-            log.add(warning:" Desired width \(desiredWidth), got \(scaledSize.width)", source: destination)
-        }
-
-        let destinationExtension = destinationUrl.pathExtension.lowercased()
-        guard let type = ImageType(fileExtension: destinationExtension)?.fileType else {
-            log.add(error: "No image type for extension \(destinationExtension)",
-                    source: destination)
-            return
-        }
-        guard let tiff = scaledImage.tiffRepresentation, let tiffData = NSBitmapImageRep(data: tiff) else {
-            log.add(error: "Failed to get data", source: image.source)
-            return
-        }
-
-        guard let data = tiffData.representation(using: type, properties: [.compressionFactor: NSNumber(0.7)]) else {
-            log.add(error: "Failed to get data", source: image.source)
-            return
-        }
-        do {
-            try data.createFolderAndWrite(to: destinationUrl)
-        } catch {
-            log.add(error: "Failed to write image \(destination)", source: "Image Processor", error: error)
-            return
-        }
-    }
-
-    // MARK: File copying
-
-    /**
-     Add a file as required, so that it will be copied to the output directory.
-     */
-    func require(file: String) {
-        requiredFiles.insert(file)
-    }
-
-    /**
-     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() {
-        for file in requiredFiles {
-            let cleanPath = cleanRelativeURL(file)
-            let sourceUrl = input.appendingPathComponent(cleanPath)
-            let destinationUrl = output.appendingPathComponent(cleanPath)
-            guard sourceUrl.exists else {
-                if !externalFiles.contains(file) {
-                    log.add(error: "Missing required file", source: cleanPath)
-                }
-                continue
-            }
-            let data: Data
-            do {
-                data = try Data(contentsOf: sourceUrl)
-            } catch {
-                log.add(error: "Failed to read data at \(sourceUrl.path)", source: source, error: error)
-                continue
-            }
-            writeIfChanged(data, to: destinationUrl)
-        }
-        for (file, source) in expectedFiles {
-            guard !externalFiles.contains(file) else {
-                continue
-            }
-            let cleanPath = cleanRelativeURL(file)
-            let destinationUrl = output.appendingPathComponent(cleanPath)
-            if !destinationUrl.exists {
-                log.add(error: "Missing \(cleanPath)", source: source)
-            }
-        }
-    }
-
-    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: "/")
-    }
-
-    // MARK: Pages
-
-    func isEmpty(page: String) {
-        emptyPages.insert(page)
-    }
-
-    func printEmptyPages() {
-        guard !emptyPages.isEmpty else {
-            return
-        }
-        log.add(info: "\(emptyPages.count) empty pages:", source: "Files")
-        for page in emptyPages.sorted() {
-            log.add(info: "\(page) has no content", source: "Files")
-        }
-    }
-
-    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]
-    }
-
-
-    // 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)
-    }
-}
-
-private extension Digest {
-
-    var bytes: [UInt8] { Array(makeIterator()) }
-
-    var data: Data { Data(bytes) }
-
-    var hexStr: String {
-        bytes.map { String(format: "%02X", $0) }.joined()
-    }
-}

WebsiteGenerator/Files/ValidationLog.swift

@@ -1,153 +0,0 @@
-import Foundation
-
-final class ValidationLog {
-
-    private enum LogLevel: String {
-        case error = "ERROR"
-        case warning = "WARNING"
-        case info = "INFO"
-    }
-
-    init() {
-
-    }
-
-    private func add(_ type: LogLevel, item: ContentError) {
-        let errorText: String
-        if let err = item.error {
-            errorText = ", Error: \(err.localizedDescription)"
-        } else {
-            errorText = ""
-        }
-        print("[\(type.rawValue)][\(item.source)] \(item.reason)\(errorText)")
-    }
-
-    func add(error: ContentError) {
-        add(.error, item: error)
-    }
-
-    func add(error reason: String, source: String, error: Error? = nil) {
-        add(error: .init(reason: reason, source: source, error: error))
-    }
-
-    func add(warning: ContentError) {
-        add(.warning, item: warning)
-    }
-
-    func add(warning reason: String, source: String, error: Error? = nil) {
-        add(warning: .init(reason: reason, source: source, error: error))
-    }
-
-    func add(info: ContentError) {
-        add(.info, item: info)
-    }
-
-    func add(info reason: String, source: String, error: Error? = nil) {
-        add(info: .init(reason: reason, source: source, error: error))
-    }
-
-    @discardableResult
-    func unused<T, R>(_ value: Optional<T>, _ name: String, source: String) -> Optional<R> {
-        if value != nil {
-            add(info: "Unused property '\(name)'", source: source)
-        }
-        return nil
-    }
-
-    func unknown(property: String, source: String) {
-        add(info: "Unknown property '\(property)'", source: source)
-    }
-
-    func required<T>(_ value: Optional<T>, name: String, source: String) -> Optional<T> {
-        guard let value = value else {
-            add(error: "Missing property '\(name)'", source: source)
-            return nil
-        }
-        return value
-    }
-
-    func unexpected<T>(_ value: Optional<T>, name: String, source: String) -> Optional<T> {
-        if let value = value {
-            add(error: "Unexpected property '\(name)' = '\(value)'", source: source)
-            return nil
-        }
-        return nil
-    }
-
-    func missing(_ file: String, requiredBy source: String) {
-        print("[ERROR] Missing file '\(file)' required by \(source)")
-    }
-
-    func failedToOpen(_ file: String, requiredBy source: String, error: Error?) {
-        print("[ERROR] Failed to open file '\(file)' required by \(source): \(error?.localizedDescription ?? "No error provided")")
-    }
-
-    func state(_ raw: String?, source: String) -> PageState {
-        guard let raw = raw else {
-            return .standard
-        }
-        guard let state = PageState(rawValue: raw) else {
-            add(warning: "Invalid 'state' '\(raw)', using 'standard'", source: source)
-            return .standard
-        }
-        return state
-    }
-
-    func thumbnailStyle(_ raw: String?, source: String) -> ThumbnailStyle {
-        guard let raw = raw else {
-            return .large
-        }
-        guard let style = ThumbnailStyle(rawValue: raw) else {
-            add(warning: "Invalid 'thumbnailStyle' '\(raw)', using 'large'", source: source)
-            return .large
-        }
-        return style
-    }
-
-    func linkPreviewThumbnail(customFile: String?, for language: String, in folder: URL, source: String) -> String? {
-        if let customFile = customFile {
-            #warning("Allow absolute urls for link preview thumbnails")
-            let customFileUrl = folder.appendingPathComponent(customFile)
-            guard customFileUrl.exists else {
-                missing(customFile, requiredBy: "property 'linkPreviewImage' in metadata of \(source)")
-                return nil
-            }
-            return customFile
-        }
-        guard let thumbnail = Element.findThumbnail(for: language, in: folder) else {
-            // Link preview images are not necessarily required
-            return nil
-        }
-        return thumbnail
-    }
-
-    func moreLinkText(_ elementText: String?, parent parentText: String?, source: String) -> String {
-        if let elementText = elementText {
-            return elementText
-        }
-        let standard = Element.LocalizedMetadata.moreLinkDefaultText
-        guard let parentText = parentText, parentText != standard else {
-            add(error: "Missing property 'moreLinkText'", source: source)
-            return standard
-        }
-
-        return parentText
-    }
-
-    func date(from string: String?, property: String, source: String) -> Date? {
-        guard let string = string else {
-            return nil
-        }
-        guard let date = ValidationLog.metadataDate.date(from: string) else {
-            add(warning: "Invalid date string '\(string)' for property '\(property)'", source: source)
-            return nil
-        }
-        return date
-    }
-
-    private static let metadataDate: DateFormatter = {
-        let df = DateFormatter()
-        df.dateFormat = "dd.MM.yy"
-        return df
-    }()
-}

WebsiteGenerator/Generators/IndexPageGenerator.swift

@@ -1,39 +0,0 @@
-import Foundation
-
-struct IndexPageGenerator {
-
-    private let factory: LocalizedSiteTemplate
-
-    init(factory: LocalizedSiteTemplate) {
-        self.factory = factory
-    }
-
-    func generate(site: Element, language: String) {
-        let localized = site.localized(for: language)
-        let path = site.localizedPath(for: language)
-        let pageUrl = files.urlInOutputFolder(path)
-        let languageButton = site.nextLanguage(for: language)
-        let sectionItemCount = site.overviewItemCount
-
-        var content = [PageTemplate.Key : String]()
-        content[.head] = factory.pageHead.generate(page: site, language: language)
-        content[.topBar] = factory.topBar.generate(sectionUrl: nil, languageButton: languageButton)
-        content[.contentClass] = "overview"
-        content[.header] = makeHeader(page: site, metadata: localized, language: language)
-        content[.content] = factory.overviewSection.generate(
-            sections: site.sortedItems,
-            in: site,
-            language: language,
-            sectionItemCount: sectionItemCount)
-        content[.footer] = site.customFooterContent()
-        guard factory.page.generate(content, to: pageUrl) else {
-            return
-        }
-        log.add(info: "Page generated", source: path)
-    }
-
-    private func makeHeader(page: Element, metadata: Element.LocalizedMetadata, language: String) -> String {
-        let content = factory.makeHeaderContent(page: page, metadata: metadata, language: language)
-        return factory.factory.centeredHeader.generate(content)
-    }
-}

WebsiteGenerator/Generators/MarkdownProcessor.swift

@@ -1,208 +0,0 @@
-import Foundation
-import Ink
-import Splash
-
-struct PageContentGenerator {
-
-    private let factory: TemplateFactory
-
-    private let swift = SyntaxHighlighter(format: HTMLOutputFormat())
-
-    init(factory: TemplateFactory) {
-        self.factory = factory
-    }
-
-    func generate(page: Element, language: String, content: String) -> (content: String, includesCode: Bool) {
-        var hasCodeContent = false
-
-        let imageModifier = Modifier(target: .images) { html, markdown in
-            processMarkdownImage(markdown: markdown, html: html, page: page)
-        }
-        let codeModifier = Modifier(target: .codeBlocks) { html, markdown in
-            if markdown.starts(with: "```swift") {
-                let code = markdown.between("```swift", and: "```").trimmed
-                return "<pre><code>" + swift.highlight(code) + "</pre></code>"
-            }
-            hasCodeContent = true
-            return html
-        }
-        let linkModifier = Modifier(target: .links) { html, markdown in
-            handleLink(page: page, language: language, html: html, markdown: markdown)
-        }
-        let htmlModifier = Modifier(target: .html) { html, markdown in
-            handleHTML(page: page, language: language, html: html, markdown: markdown)
-        }
-
-        let parser = MarkdownParser(modifiers: [imageModifier, codeModifier, linkModifier, htmlModifier])
-        return (parser.html(from: content), hasCodeContent)
-    }
-
-    private func handleLink(page: Element, language: String, html: String, markdown: Substring) -> String {
-        let file = markdown.between("(", and: ")")
-        if file.hasPrefix("page:") {
-            let pageId = file.replacingOccurrences(of: "page:", with: "")
-            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: "]")
-            }
-            let fullPath = pagePath + Element.htmlPagePathAddition(for: language)
-            // Adjust file path to get the page url
-            let url = page.relativePathToOtherSiteElement(pageUrl: fullPath)
-            return html.replacingOccurrences(of: file, with: url)
-        }
-
-        if let filePath = page.nonAbsolutePathRelativeToRootForContainedInputFile(file) {
-            // The target of the page link must be present after generation is complete
-            files.expect(file: filePath, source: page.path)
-        }
-        return html
-    }
-
-    private func handleHTML(page: Element, language: String, html: String, markdown: Substring) -> String {
-        #warning("Check HTML code in markdown for required resources")
-        //print("[HTML] Found in page \(page.path):")
-        //print(markdown)
-        // Things to check:
-        // <img src=
-        // <a href=
-        //
-        return html
-    }
-
-    private func processMarkdownImage(markdown: Substring, html: String, page: Element) -> String {
-        // Split the markdown ![alt](file title)
-        // For images: ![left_title](file right_title)
-        // For videos: ![option1,option2,...](file)
-        // For svg with custom area: ![x,y,width,height](file.svg)
-        // For downloads: ![download](file1,text1;file2,text2, ...)
-        // For files: ?
-        let fileAndTitle = markdown.between("(", and: ")")
-        let alt = markdown.between("[", and: "]").nonEmpty
-        if alt == "download" {
-            return handleDownloadButtons(page: page, content: fileAndTitle)
-        }
-        if alt == "external" {
-            return handleExternalButtons(page: page, content: fileAndTitle)
-        }
-
-        let file = fileAndTitle.dropAfterFirst(" ")
-        let title = fileAndTitle.contains(" ") ? fileAndTitle.dropBeforeFirst(" ").nonEmpty : nil
-
-        let fileExtension = file.lastComponentAfter(".").lowercased()
-        if let _ = ImageType(fileExtension: fileExtension) {
-            return handleImage(page: page, file: file, rightTitle: title, leftTitle: alt)
-        }
-        if let _ = VideoType(rawValue: fileExtension) {
-            return handleVideo(page: page, file: file, optionString: alt)
-        }
-        if fileExtension == "svg" {
-            return handleSvg(page: page, file: file, area: alt)
-        }
-        return handleFile(page: page, file: file, fileExtension: fileExtension)
-    }
-
-    private func handleImage(page: Element, file: String, rightTitle: String?, leftTitle: String?) -> String {
-        let imagePath = page.pathRelativeToRootForContainedInputFile(file)
-
-        let size = files.requireImage(source: imagePath, destination: imagePath, width: configuration.pageImageWidth)
-
-        let imagePath2x = imagePath.insert("@2x", beforeLast: ".")
-        let file2x = file.insert("@2x", beforeLast: ".")
-        files.requireImage(source: imagePath, destination: imagePath2x, width: 2 * configuration.pageImageWidth)
-
-        let content: [PageImageTemplate.Key : String] = [
-            .image: file,
-            .image2x: file2x,
-            .width: "\(Int(size.width))",
-            .height: "\(Int(size.height))",
-            .leftText: leftTitle ?? "",
-            .rightText: rightTitle ?? ""]
-        return factory.image.generate(content)
-    }
-
-    private func handleVideo(page: Element, file: String, optionString: String?) -> String {
-        let options: [PageVideoTemplate.VideoOption] = optionString.unwrapped { string in
-            string.components(separatedBy: " ").compactMap { optionText in
-                guard let optionText = optionText.trimmed.nonEmpty else {
-                    return nil
-                }
-                guard let option = PageVideoTemplate.VideoOption(rawValue: optionText) else {
-                    log.add(warning: "Unknown video option \(optionText)", source: page.path)
-                    return nil
-                }
-                return option
-            }
-        } ?? []
-        #warning("Check page folder for alternative video versions")
-        let sources: [PageVideoTemplate.VideoSource] = [(url: file, type: .mp4)]
-
-        let filePath = page.pathRelativeToRootForContainedInputFile(file)
-        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)
-        files.require(file: imagePath)
-
-        guard let area = area else {
-            return factory.html.svgImage(file: file)
-        }
-        let parts = area.components(separatedBy: ",").map { $0.trimmed }
-        guard parts.count == 4,
-              let x = Int(parts[0]),
-              let y = Int(parts[1]),
-              let width = Int(parts[2]),
-              let height = Int(parts[3]) else {
-            log.add(warning: "Invalid area string for svg image", source: page.path)
-            return factory.html.svgImage(file: file)
-        }
-
-        return factory.html.svgImage(file: file, x: x, y: y, width: width, height: height)
-    }
-
-    private func handleFile(page: Element, file: String, fileExtension: String) -> String {
-        log.add(warning: "Unhandled file \(file) with extension \(fileExtension)", source: page.path)
-        return ""
-    }
-
-    private func handleDownloadButtons(page: Element, content: String) -> String {
-        let buttons = content
-            .components(separatedBy: ";")
-            .compactMap { button -> (file: String, text: String, downloadName: String?)? in
-                let parts = button.components(separatedBy: ",")
-                guard parts.count == 2 || parts.count == 3 else {
-                    log.add(warning: "Invalid button definition", source: page.path)
-                    return nil
-                }
-                let file = parts[0].trimmed
-                let title = parts[1].trimmed
-                let downloadName = parts.count == 3 ? parts[2].trimmed : nil
-
-                // Ensure that file is available
-                let filePath = page.pathRelativeToRootForContainedInputFile(file)
-                files.require(file: filePath)
-
-                return (file, title, downloadName)
-            }
-        return factory.html.downloadButtons(buttons)
-    }
-
-    private func handleExternalButtons(page: Element, content: String) -> String {
-        let buttons = content
-            .components(separatedBy: ";")
-            .compactMap { button -> (url: String, text: String)? in
-                let parts = button.components(separatedBy: ",")
-                guard parts.count == 2 else {
-                    log.add(warning: "Invalid external link definition", source: page.path)
-                    return nil
-                }
-                let url = parts[0].trimmed
-                let title = parts[1].trimmed
-
-                return (url, title)
-            }
-        return factory.html.externalButtons(buttons)
-    }
-}

WebsiteGenerator/Generators/OverviewSectionGenerator.swift

@@ -1,47 +0,0 @@
-import Foundation
-
-struct OverviewSectionGenerator {
-
-    private let multipleSectionsTemplate: OverviewSectionTemplate
-
-    private let singleSectionsTemplate: OverviewSectionCleanTemplate
-
-    private let generator: ThumbnailListGenerator
-
-    init(factory: TemplateFactory) {
-        self.multipleSectionsTemplate = factory.overviewSection
-        self.singleSectionsTemplate = factory.overviewSectionClean
-        self.generator = ThumbnailListGenerator(factory: factory)
-    }
-
-    func generate(sections: [Element], in parent: Element, language: String, sectionItemCount: Int) -> String {
-        sections.map { section in
-            let metadata = section.localized(for: language)
-            let fullUrl = section.fullPageUrl(for: language)
-            let relativeUrl = parent.relativePathToFileWithPath(fullUrl)
-
-            var content = [OverviewSectionTemplate.Key : String]()
-            content[.url] = relativeUrl
-            content[.title] = metadata.title
-            content[.items] = generator.generateContent(
-                items: section.itemsForOverview(sectionItemCount),
-                parent: parent,
-                language: language,
-                style: section.thumbnailStyle)
-            content[.more] = metadata.moreLinkText
-
-            return multipleSectionsTemplate.generate(content)
-        }
-        .joined(separator: "\n")
-    }
-
-    func generate(section: Element, language: String) -> String {
-        var content = [OverviewSectionCleanTemplate.Key : String]()
-        content[.items] = generator.generateContent(
-            items: section.itemsForOverview(),
-            parent: section,
-            language: language,
-            style: section.thumbnailStyle)
-        return singleSectionsTemplate.generate(content)
-    }
-}

WebsiteGenerator/Generators/PageGenerator.swift

@@ -1,75 +0,0 @@
-import Foundation
-import Ink
-
-struct PageGenerator {
-
-    struct NavigationLink {
-
-        let link: String
-
-        let text: String
-    }
-
-    private let factory: LocalizedSiteTemplate
-
-    init(factory: LocalizedSiteTemplate) {
-        self.factory = factory
-    }
-
-    func generate(page: Element, language: String, nextPage: NavigationLink?, previousPage: NavigationLink?) {
-        guard !page.isExternalPage else {
-            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 = makeContent(page: page, language: language, path: inputContentPath)
-        let pageIncludesCode = pageContent?.includesCode ?? false
-        
-        var content = [PageTemplate.Key : String]()
-        content[.head] = factory.pageHead.generate(page: page, language: language, includesCode: pageIncludesCode)
-        let sectionUrl = page.sectionUrl(for: language)
-        content[.topBar] = factory.topBar.generate(sectionUrl: sectionUrl, languageButton: nextLanguage)
-        content[.contentClass] = "content"
-
-        if !page.useCustomHeader {
-            content[.header] = makeHeader(page: page, metadata: metadata, language: language)
-        }
-        content[.content] = pageContent?.content ?? factory.makePlaceholder(metadata: metadata)
-        content[.previousPageLinkText] = previousPage.unwrapped { factory.factory.html.makePrevText($0.text) }
-        content[.previousPageUrl] = previousPage?.link
-        content[.nextPageLinkText] = nextPage.unwrapped { factory.factory.html.makeNextText($0.text) }
-        content[.nextPageUrl] = nextPage?.link
-        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 pageContent == nil {
-            files.isEmpty(page: path)
-        }
-        guard factory.page.generate(content, to: url) else {
-            return
-        }
-        log.add(info: "Page generated", source: path)
-    }
-
-    private func makeContent(page: Element, language: String, path: String) -> (content: String, includesCode: Bool)? {
-        guard let content = files.contentOfOptionalFile(atPath: path, source: page.path, createEmptyFileIfMissing: true),
-              content.trimmed != "" else {
-            return nil
-        }
-        return PageContentGenerator(factory: factory.factory)
-            .generate(page: page, language: language, content: content)
-    }
-
-    private func makeHeader(page: Element, metadata: Element.LocalizedMetadata, language: String) -> String {
-        let content = factory.makeHeaderContent(page: page, metadata: metadata, language: language)
-        return factory.factory.leftHeader.generate(content)
-    }
-
-}

WebsiteGenerator/Generators/SiteGenerator.swift

@@ -1,55 +0,0 @@
-import Foundation
-
-struct SiteGenerator {
-
-    let templates: TemplateFactory
-
-    init() throws {
-        let templatesFolder = files.urlInContentFolder("templates")
-        self.templates = try TemplateFactory(templateFolder: templatesFolder)
-    }
-
-    func generate(site: Element) throws {
-        site.requiredFiles.forEach(files.require)
-        site.externalFiles.forEach(files.exclude)
-        try site.languages.forEach {
-            try generate(site: site, metadata: $0)
-        }
-    }
-
-    private func generate(site: Element, metadata: Element.LocalizedMetadata) throws {
-        let language = metadata.language
-        let template = try LocalizedSiteTemplate(
-            factory: templates,
-            language: language,
-            site: site)
-
-        // Generate sections
-        let overviewGenerator = OverviewPageGenerator(factory: template)
-        let pageGenerator = PageGenerator(factory: template)
-        var elementsToProcess: [Element] = site.elements
-        while let element = elementsToProcess.popLast() {
-            // Move recursively down to all pages
-            elementsToProcess.append(contentsOf: element.elements)
-
-            element.requiredFiles.forEach(files.require)
-            element.externalFiles.forEach(files.exclude)
-
-            if !element.elements.isEmpty {
-                overviewGenerator.generate(section: element, language: language)
-            } else {
-                #warning("Determine previous and next pages (with relative links)")
-                pageGenerator.generate(
-                    page: element,
-                    language: language,
-                    nextPage: nil,
-                    previousPage: nil)
-            }
-        }
-
-        let generator = IndexPageGenerator(factory: template)
-
-        // Generate front page
-        generator.generate(site: site, language: language)
-    }
-}

WebsiteGenerator/Templates/Elements/PageImageTemplate.swift

@@ -1,18 +0,0 @@
-import Foundation
-
-struct PageImageTemplate: Template {
-
-    enum Key: String, CaseIterable {
-        case image = "IMAGE"
-        case image2x = "IMAGE_2X"
-        case width = "WIDTH"
-        case height = "HEIGHT"
-        case leftText = "LEFT_TEXT"
-        case rightText = "RIGHT_TEXT"
-    }
-
-    static let templateName = "image.html"
-
-    let raw: String
-
-}

WebsiteGenerator/Templates/TemplateFactory.swift

@@ -1,78 +0,0 @@
-import Foundation
-
-final class TemplateFactory {
-
-    let templateFolder: URL
-
-    // MARK: Site Elements
-
-    let backNavigation: BackNavigationTemplate
-
-    let pageHead: PageHeadTemplate
-
-    let topBar: TopBarTemplate
-
-    let overviewSection: OverviewSectionTemplate
-
-    let overviewSectionClean: OverviewSectionCleanTemplate
-
-    let placeholder: PlaceholderTemplate
-
-    // MARK: Thumbnails
-
-    let largeThumbnail: LargeThumbnailTemplate
-
-    let squareThumbnail: SquareThumbnailTemplate
-
-    let smallThumbnail: SmallThumbnailTemplate
-
-    func thumbnail(style: ThumbnailStyle) -> ThumbnailTemplate {
-        switch style {
-        case .large:
-            return largeThumbnail
-        case .square:
-            return squareThumbnail
-        case .small:
-            return smallThumbnail
-        }
-    }
-
-    // MARK: Headers
-
-    let leftHeader: LeftHeaderTemplate
-
-    let centeredHeader: CenteredHeaderTemplate
-
-    // MARK: Pages
-
-    let page: PageTemplate
-
-    let image: PageImageTemplate
-
-    let video: PageVideoTemplate
-
-    // MARK: HTML
-
-    let html: HTMLElementsGenerator
-
-    // MARK: Init
-
-    init(templateFolder: URL) throws {
-        self.templateFolder = templateFolder
-        self.backNavigation = try .init(in: templateFolder)
-        self.pageHead = try .init(in: templateFolder)
-        self.topBar = try .init(in: templateFolder)
-        self.overviewSection = try .init(in: templateFolder)
-        self.overviewSectionClean = try .init(in: templateFolder)
-        self.placeholder = try .init(in: templateFolder)
-        self.largeThumbnail = try .init(in: templateFolder)
-        self.squareThumbnail = try .init(in: templateFolder)
-        self.smallThumbnail = try .init(in: templateFolder)
-        self.leftHeader = try .init(in: templateFolder)
-        self.centeredHeader = try .init(in: templateFolder)
-        self.page = try .init(in: templateFolder)
-        self.image = try .init(in: templateFolder)
-        self.video = try .init(in: templateFolder)
-        self.html = .init()
-    }
-}

WebsiteGenerator/main.swift

@@ -1,31 +0,0 @@
-import Foundation
-
-private let contentDirectory = URL(fileURLWithPath: "/Users/ch/Projects/MakerSpace")
-private let outputDirectory = URL(fileURLWithPath: "/Users/ch/Projects/MakerSpace/Site")
-
-let configuration = Configuration(pageImageWidth: 748)
-
-let log = ValidationLog()
-let files = FileSystem(in: contentDirectory, to: outputDirectory)
-
-private let siteData: Element
-do {
-    guard let element = try Element(atRoot: contentDirectory) else {
-        exit(0)
-    }
-    siteData = element
-} catch {
-    print(error)
-    exit(0)
-}
-
-private let siteGenerator = try SiteGenerator()
-try siteGenerator.generate(site: siteData)
-
-print("Pages generated")
-files.createImages()
-files.printEmptyPages()
-print("Images generated")
-files.copyRequiredFiles()
-print("Required files copied")
-files.writeHashes()

config_example.json

@@ -0,0 +1,9 @@
+{
+    "pageImageWidth" : 748,
+    "fullScreenImageWidth" : 4000,
+    "minifyJavaScript" : false,
+    "minifyCSS" : false,
+    "createMdFilesIfMissing" : false,
+    "contentPath" : "/path/to/content/folder",
+    "outputPath" : "/path/to/output/folder")
+}

install.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Install the required dependencies for CHGenerator
+
+# Install magick to resize images
+brew install imagemagick
+
+# Install avif to create AVIF versions of images
+npm install avif -g
+
+# Install the Javascript minifier (required if `minifyJavaScript = True`)
+# https://github.com/mishoo/UglifyJS
+npm install uglify-js -g
+
+# Install the clean-css minifier (required if `minifyCSS = True`)
+# https://github.com/clean-css/clean-css-cli
+npm install clean-css-cli -g
+
+# Required to optimize jpg/png/svg
+npm install imageoptim-cli -g